Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

48 files changed, 11345 insertions, 0 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
new file mode 100644
index 000000000..3da8e85f8
--- /dev/null
+++ b/drivers/char/hw_random/Kconfig
@@ -0,0 +1,567 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Hardware Random Number Generator (RNG) configuration
+#
+
+menuconfig HW_RANDOM
+	tristate "Hardware Random Number Generator Core support"
+	default m
+	help
+	  Hardware Random Number Generator Core infrastructure.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rng-core.  This provides a device
+	  that's usually called /dev/hwrng, and which exposes one
+	  of possibly several hardware random number generators.
+
+	  These hardware random number generators do feed into the
+	  kernel's random number generator entropy pool.
+
+	  If unsure, say Y.
+
+if HW_RANDOM
+
+config HW_RANDOM_TIMERIOMEM
+	tristate "Timer IOMEM HW Random Number Generator support"
+	depends on HAS_IOMEM
+	help
+	  This driver provides kernel-side support for a generic Random
+	  Number Generator used by reading a 'dumb' iomem address that
+	  is to be read no faster than, for example, once a second;
+	  the default FPGA bitstream on the TS-7800 has such functionality.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called timeriomem-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_INTEL
+	tristate "Intel HW Random Number Generator support"
+	depends on (X86 || IA64) && PCI
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Intel i8xx-based motherboards.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called intel-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_AMD
+	tristate "AMD HW Random Number Generator support"
+	depends on (X86 || PPC_MAPLE) && PCI
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on AMD 76x-based motherboards.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called amd-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_ATMEL
+	tristate "Atmel Random Number Generator support"
+	depends on (ARCH_AT91 || COMPILE_TEST) && HAVE_CLK && OF
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Atmel AT91 devices.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called atmel-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_BA431
+	tristate "Silex Insight BA431 Random Number Generator support"
+	depends on HAS_IOMEM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware based on Silex Insight BA431 IP.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ba431-rng.
+
+config HW_RANDOM_BCM2835
+	tristate "Broadcom BCM2835/BCM63xx Random Number Generator support"
+	depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X || \
+		   ARCH_BCMBCA || BCM63XX || BMIPS_GENERIC || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on the Broadcom BCM2835 and BCM63xx SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bcm2835-rng
+
+	  If unsure, say Y.
+
+config HW_RANDOM_IPROC_RNG200
+	tristate "Broadcom iProc/STB RNG200 support"
+	depends on ARCH_BCM_IPROC || ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the RNG200
+	  hardware found on the Broadcom iProc and STB SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called iproc-rng200
+
+	  If unsure, say Y.
+
+config HW_RANDOM_GEODE
+	tristate "AMD Geode HW Random Number Generator support"
+	depends on X86_32 && PCI
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on the AMD Geode LX.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called geode-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_N2RNG
+	tristate "Niagara2 Random Number Generator support"
+	depends on SPARC64
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Niagara2 cpus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called n2-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_VIA
+	tristate "VIA HW Random Number Generator support"
+	depends on X86
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on VIA based motherboards.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called via-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_IXP4XX
+	tristate "Intel IXP4xx NPU HW Pseudo-Random Number Generator support"
+	depends on ARCH_IXP4XX || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Pseudo-Random
+	  Number Generator hardware found on the Intel IXP45x/46x NPU.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ixp4xx-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_OMAP
+	tristate "OMAP Random Number Generator support"
+	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS || ARCH_MVEBU || ARCH_K3 || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on OMAP16xx, OMAP2/3/4/5, AM33xx/AM43xx
+	  multimedia processors, and Marvell Armada 7k/8k SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called omap-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_OMAP3_ROM
+	tristate "OMAP3 ROM Random Number Generator support"
+	depends on ARCH_OMAP3 || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on OMAP34xx processors.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called omap3-rom-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_OCTEON
+	tristate "Octeon Random Number Generator support"
+	depends on CAVIUM_OCTEON_SOC
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Octeon processors.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called octeon-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_PASEMI
+	tristate "PA Semi HW Random Number Generator support"
+	depends on PPC_PASEMI
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on PA Semi PWRficient SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pasemi-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_VIRTIO
+	tristate "VirtIO Random Number Generator support"
+	depends on VIRTIO
+	help
+	  This driver provides kernel-side support for the virtual Random Number
+	  Generator hardware.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called virtio-rng.  If unsure, say N.
+
+config HW_RANDOM_MXC_RNGA
+	tristate "Freescale i.MX RNGA Random Number Generator"
+	depends on SOC_IMX31
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Freescale i.MX processors.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mxc-rnga.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_IMX_RNGC
+	tristate "Freescale i.MX RNGC Random Number Generator"
+	depends on HAS_IOMEM && HAVE_CLK
+	depends on SOC_IMX25 || SOC_IMX6SL || SOC_IMX6SLL || SOC_IMX6UL || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator Version C hardware found on some Freescale i.MX
+	  processors. Version B is also supported by this driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imx-rngc.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_INGENIC_RNG
+	tristate "Ingenic Random Number Generator support"
+	depends on HW_RANDOM
+	depends on MACH_JZ4780 || MACH_X1000
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number Generator
+	  hardware found in ingenic JZ4780 and X1000 SoC. MIPS Creator CI20 uses
+	  JZ4780 SoC, YSH & ATIL CU1000-Neo uses X1000 SoC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ingenic-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_INGENIC_TRNG
+	tristate "Ingenic True Random Number Generator support"
+	depends on HW_RANDOM
+	depends on MACH_X1830
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the True Random Number Generator
+	  hardware found in ingenic X1830 SoC. YSH & ATIL CU1830-Neo uses X1830 SoC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ingenic-trng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_NOMADIK
+	tristate "ST-Ericsson Nomadik Random Number Generator support"
+	depends on ARCH_NOMADIK || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on ST-Ericsson SoCs (8815 and 8500).
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called nomadik-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_PSERIES
+	tristate "pSeries HW Random Number Generator support"
+	depends on PPC64 && IBMVIO
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on POWER7+ machines and above
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pseries-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_POWERNV
+	tristate "PowerNV Random Number Generator support"
+	depends on PPC_POWERNV
+	default HW_RANDOM
+	help
+	  This is the driver for Random Number Generator hardware found
+	  in POWER7+ and above machines for PowerNV platform.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called powernv-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_HISI
+	tristate "Hisilicon Random Number Generator support"
+	depends on HW_RANDOM && ARCH_HISI
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Hisilicon Hip04 and Hip05 SoC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called hisi-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_ST
+	tristate "ST Microelectronics HW Random Number Generator support"
+	depends on HW_RANDOM && ARCH_STI
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on STi series of SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called st-rng.
+
+config HW_RANDOM_XGENE
+	tristate "APM X-Gene True Random Number Generator (TRNG) support"
+	depends on HW_RANDOM && ARCH_XGENE
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on APM X-Gene SoC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called xgene_rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_STM32
+	tristate "STMicroelectronics STM32 random number generator"
+	depends on HW_RANDOM && (ARCH_STM32 || COMPILE_TEST)
+	depends on HAS_IOMEM
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on STM32 microcontrollers.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called stm32-rng.
+
+	  If unsure, say N.
+
+config HW_RANDOM_PIC32
+	tristate "Microchip PIC32 Random Number Generator support"
+	depends on HW_RANDOM && MACH_PIC32
+	default y
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on a PIC32.
+
+	  To compile this driver as a module, choose M here. the
+	  module will be called pic32-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_POLARFIRE_SOC
+	tristate "Microchip PolarFire SoC Random Number Generator support"
+	depends on HW_RANDOM && POLARFIRE_SOC_SYS_CTRL
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on PolarFire SoC (MPFS).
+
+	  To compile this driver as a module, choose M here. The
+	  module will be called mfps_rng.
+
+	  If unsure, say N.
+
+
+config HW_RANDOM_MESON
+	tristate "Amlogic Meson Random Number Generator support"
+	depends on HW_RANDOM
+	depends on ARCH_MESON || COMPILE_TEST
+	default y
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Amlogic Meson SoCs.
+
+	  To compile this driver as a module, choose M here. the
+	  module will be called meson-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_CAVIUM
+	tristate "Cavium ThunderX Random Number Generator support"
+	depends on HW_RANDOM && PCI && ARCH_THUNDER
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Cavium SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cavium_rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_MTK
+	tristate "Mediatek Random Number Generator support"
+	depends on HW_RANDOM
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+	default y
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Mediatek SoCs.
+
+	  To compile this driver as a module, choose M here. the
+	  module will be called mtk-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_S390
+	tristate "S390 True Random Number Generator support"
+	depends on S390
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the True
+	  Random Number Generator available as CPACF extension
+	  on modern s390 hardware platforms.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called s390-trng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_EXYNOS
+	tristate "Samsung Exynos True Random Number Generator support"
+	depends on ARCH_EXYNOS || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides support for the True Random Number
+	  Generator available in Exynos SoCs.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called exynos-trng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_OPTEE
+	tristate "OP-TEE based Random Number Generator support"
+	depends on OPTEE
+	default HW_RANDOM
+	help
+	  This  driver provides support for OP-TEE based Random Number
+	  Generator on ARM SoCs where hardware entropy sources are not
+	  accessible to normal world (Linux).
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called optee-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_NPCM
+	tristate "NPCM Random Number Generator support"
+	depends on ARCH_NPCM || COMPILE_TEST
+	default HW_RANDOM
+	help
+	  This driver provides support for the Random Number
+	  Generator hardware available in Nuvoton NPCM SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called npcm-rng.
+
+	  If unsure, say Y.
+
+config HW_RANDOM_KEYSTONE
+	depends on ARCH_KEYSTONE || COMPILE_TEST
+	depends on HAS_IOMEM && OF
+	default HW_RANDOM
+	tristate "TI Keystone NETCP SA Hardware random number generator"
+	help
+	  This option enables Keystone's hardware random generator.
+
+config HW_RANDOM_CCTRNG
+	tristate "Arm CryptoCell True Random Number Generator support"
+	depends on HAS_IOMEM && OF
+	help
+	  Say 'Y' to enable the True Random Number Generator driver for the
+	  Arm TrustZone CryptoCell family of processors.
+	  Currently the CryptoCell 713 and 703 are supported.
+	  The driver is supported only in SoC where Trusted Execution
+	  Environment is not used.
+	  Choose 'M' to compile this driver as a module. The module
+	  will be called cctrng.
+	  If unsure, say 'N'.
+
+config HW_RANDOM_XIPHERA
+	tristate "Xiphera FPGA based True Random Number Generator support"
+	depends on HAS_IOMEM
+	help
+	  This driver provides kernel-side support for Xiphera True Random
+	  Number Generator Intellectual Property Core.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called xiphera-trng.
+
+config HW_RANDOM_ARM_SMCCC_TRNG
+	tristate "Arm SMCCC TRNG firmware interface support"
+	depends on HAVE_ARM_SMCCC_DISCOVERY
+	default HW_RANDOM
+	help
+	  Say 'Y' to enable the True Random Number Generator driver using
+	  the Arm SMCCC TRNG firmware interface. This reads entropy from
+	  higher exception levels (firmware, hypervisor). Uses SMCCC for
+	  communicating with the firmware:
+	  https://developer.arm.com/documentation/den0098/latest/
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called arm_smccc_trng.
+
+config HW_RANDOM_CN10K
+       tristate "Marvell CN10K Random Number Generator support"
+       depends on HW_RANDOM && PCI && (ARM64 || (64BIT && COMPILE_TEST))
+       default HW_RANDOM
+       help
+	 This driver provides support for the True Random Number
+	 generator available in Marvell CN10K SoCs.
+
+	 To compile this driver as a module, choose M here.
+	 The module will be called cn10k_rng. If unsure, say Y.
+
+endif # HW_RANDOM
+
+config UML_RANDOM
+	depends on UML
+	select HW_RANDOM
+	tristate "UML Random Number Generator support"
+	help
+	  This option enables UML's "hardware" random number generator.  It
+	  attaches itself to the host's /dev/random, supplying as much entropy
+	  as the host has, rather than the small amount the UML gets from its
+	  own drivers. It registers itself as a rng-core driver thus providing
+	  a device which is usually called /dev/hwrng. This hardware random
+	  number generator does feed into the kernel's random number generator
+	  entropy pool.
+
+	  If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
new file mode 100644
index 000000000..3e948cf04
--- /dev/null
+++ b/drivers/char/hw_random/Makefile
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for HW Random Number Generator (RNG) device drivers.
+#
+
+obj-$(CONFIG_HW_RANDOM) += rng-core.o
+rng-core-y := core.o
+obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += timeriomem-rng.o
+obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o
+obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
+obj-$(CONFIG_HW_RANDOM_ATMEL) += atmel-rng.o
+obj-$(CONFIG_HW_RANDOM_BA431) += ba431-rng.o
+obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
+obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o
+n2-rng-y := n2-drv.o n2-asm.o
+obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o
+obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-trng.o
+obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
+obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
+obj-$(CONFIG_HW_RANDOM_OMAP3_ROM) += omap3-rom-rng.o
+obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
+obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
+obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
+obj-$(CONFIG_HW_RANDOM_IMX_RNGC) += imx-rngc.o
+obj-$(CONFIG_HW_RANDOM_INGENIC_RNG) += ingenic-rng.o
+obj-$(CONFIG_HW_RANDOM_INGENIC_TRNG) += ingenic-trng.o
+obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
+obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
+obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
+obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
+obj-$(CONFIG_HW_RANDOM_HISI)	+= hisi-rng.o
+obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
+obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o
+obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o
+obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o
+obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o
+obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o
+obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o
+obj-$(CONFIG_HW_RANDOM_CAVIUM) += cavium-rng.o cavium-rng-vf.o
+obj-$(CONFIG_HW_RANDOM_MTK)	+= mtk-rng.o
+obj-$(CONFIG_HW_RANDOM_S390) += s390-trng.o
+obj-$(CONFIG_HW_RANDOM_KEYSTONE) += ks-sa-rng.o
+obj-$(CONFIG_HW_RANDOM_OPTEE) += optee-rng.o
+obj-$(CONFIG_HW_RANDOM_NPCM) += npcm-rng.o
+obj-$(CONFIG_HW_RANDOM_CCTRNG) += cctrng.o
+obj-$(CONFIG_HW_RANDOM_XIPHERA) += xiphera-trng.o
+obj-$(CONFIG_HW_RANDOM_ARM_SMCCC_TRNG) += arm_smccc_trng.o
+obj-$(CONFIG_HW_RANDOM_CN10K) += cn10k-rng.o
+obj-$(CONFIG_HW_RANDOM_POLARFIRE_SOC) += mpfs-rng.o
diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
new file mode 100644
index 000000000..0555e3838
--- /dev/null
+++ b/drivers/char/hw_random/amd-rng.c
@@ -0,0 +1,219 @@
+/*
+ * RNG driver for AMD RNGs
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * with the majority of the code coming from:
+ *
+ * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
+ * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
+ *
+ * derived from
+ *
+ * Hardware driver for the AMD 768 Random Number Generator (RNG)
+ * (c) Copyright 2001 Red Hat Inc
+ *
+ * derived from
+ *
+ * Hardware driver for Intel i810 Random Number Generator (RNG)
+ * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#define DRV_NAME "AMD768-HWRNG"
+
+#define RNGDATA		0x00
+#define RNGDONE		0x04
+#define PMBASE_OFFSET	0xF0
+#define PMBASE_SIZE	8
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
+ * register a pci_driver, because someone else might one day
+ * want to register another driver on the same PCI id.
+ */
+static const struct pci_device_id pci_tbl[] = {
+	{ PCI_VDEVICE(AMD, 0x7443), 0, },
+	{ PCI_VDEVICE(AMD, 0x746b), 0, },
+	{ 0, },	/* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, pci_tbl);
+
+struct amd768_priv {
+	void __iomem *iobase;
+	struct pci_dev *pcidev;
+	u32 pmbase;
+};
+
+static int amd_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	u32 *data = buf;
+	struct amd768_priv *priv = (struct amd768_priv *)rng->priv;
+	size_t read = 0;
+	/* We will wait at maximum one time per read */
+	int timeout = max / 4 + 1;
+
+	/*
+	 * RNG data is available when RNGDONE is set to 1
+	 * New random numbers are generated approximately 128 microseconds
+	 * after RNGDATA is read
+	 */
+	while (read < max) {
+		if (ioread32(priv->iobase + RNGDONE) == 0) {
+			if (wait) {
+				/* Delay given by datasheet */
+				usleep_range(128, 196);
+				if (timeout-- == 0)
+					return read;
+			} else {
+				return 0;
+			}
+		} else {
+			*data = ioread32(priv->iobase + RNGDATA);
+			data++;
+			read += 4;
+		}
+	}
+
+	return read;
+}
+
+static int amd_rng_init(struct hwrng *rng)
+{
+	struct amd768_priv *priv = (struct amd768_priv *)rng->priv;
+	u8 rnen;
+
+	pci_read_config_byte(priv->pcidev, 0x40, &rnen);
+	rnen |= BIT(7);	/* RNG on */
+	pci_write_config_byte(priv->pcidev, 0x40, rnen);
+
+	pci_read_config_byte(priv->pcidev, 0x41, &rnen);
+	rnen |= BIT(7);	/* PMIO enable */
+	pci_write_config_byte(priv->pcidev, 0x41, rnen);
+
+	return 0;
+}
+
+static void amd_rng_cleanup(struct hwrng *rng)
+{
+	struct amd768_priv *priv = (struct amd768_priv *)rng->priv;
+	u8 rnen;
+
+	pci_read_config_byte(priv->pcidev, 0x40, &rnen);
+	rnen &= ~BIT(7);	/* RNG off */
+	pci_write_config_byte(priv->pcidev, 0x40, rnen);
+}
+
+static struct hwrng amd_rng = {
+	.name		= "amd",
+	.init		= amd_rng_init,
+	.cleanup	= amd_rng_cleanup,
+	.read		= amd_rng_read,
+};
+
+static int __init amd_rng_mod_init(void)
+{
+	int err;
+	struct pci_dev *pdev = NULL;
+	const struct pci_device_id *ent;
+	u32 pmbase;
+	struct amd768_priv *priv;
+
+	for_each_pci_dev(pdev) {
+		ent = pci_match_id(pci_tbl, pdev);
+		if (ent)
+			goto found;
+	}
+	/* Device not found. */
+	return -ENODEV;
+
+found:
+	err = pci_read_config_dword(pdev, 0x58, &pmbase);
+	if (err)
+		goto put_dev;
+
+	pmbase &= 0x0000FF00;
+	if (pmbase == 0) {
+		err = -EIO;
+		goto put_dev;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		err = -ENOMEM;
+		goto put_dev;
+	}
+
+	if (!request_region(pmbase + PMBASE_OFFSET, PMBASE_SIZE, DRV_NAME)) {
+		dev_err(&pdev->dev, DRV_NAME " region 0x%x already in use!\n",
+			pmbase + 0xF0);
+		err = -EBUSY;
+		goto out;
+	}
+
+	priv->iobase = ioport_map(pmbase + PMBASE_OFFSET, PMBASE_SIZE);
+	if (!priv->iobase) {
+		pr_err(DRV_NAME "Cannot map ioport\n");
+		err = -EINVAL;
+		goto err_iomap;
+	}
+
+	amd_rng.priv = (unsigned long)priv;
+	priv->pmbase = pmbase;
+	priv->pcidev = pdev;
+
+	pr_info(DRV_NAME " detected\n");
+	err = hwrng_register(&amd_rng);
+	if (err) {
+		pr_err(DRV_NAME " registering failed (%d)\n", err);
+		goto err_hwrng;
+	}
+	return 0;
+
+err_hwrng:
+	ioport_unmap(priv->iobase);
+err_iomap:
+	release_region(pmbase + PMBASE_OFFSET, PMBASE_SIZE);
+out:
+	kfree(priv);
+put_dev:
+	pci_dev_put(pdev);
+	return err;
+}
+
+static void __exit amd_rng_mod_exit(void)
+{
+	struct amd768_priv *priv;
+
+	priv = (struct amd768_priv *)amd_rng.priv;
+
+	hwrng_unregister(&amd_rng);
+
+	ioport_unmap(priv->iobase);
+
+	release_region(priv->pmbase + PMBASE_OFFSET, PMBASE_SIZE);
+
+	pci_dev_put(priv->pcidev);
+
+	kfree(priv);
+}
+
+module_init(amd_rng_mod_init);
+module_exit(amd_rng_mod_exit);
+
+MODULE_AUTHOR("The Linux Kernel team");
+MODULE_DESCRIPTION("H/W RNG driver for AMD chipsets");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/arm_smccc_trng.c b/drivers/char/hw_random/arm_smccc_trng.c
new file mode 100644
index 000000000..e34c3ea69
--- /dev/null
+++ b/drivers/char/hw_random/arm_smccc_trng.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Randomness driver for the ARM SMCCC TRNG Firmware Interface
+ * https://developer.arm.com/documentation/den0098/latest/
+ *
+ *  Copyright (C) 2020 Arm Ltd.
+ *
+ * The ARM TRNG firmware interface specifies a protocol to read entropy
+ * from a higher exception level, to abstract from any machine specific
+ * implemenations and allow easier use in hypervisors.
+ *
+ * The firmware interface is realised using the SMCCC specification.
+ */
+
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/hw_random.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/arm-smccc.h>
+
+#ifdef CONFIG_ARM64
+#define ARM_SMCCC_TRNG_RND	ARM_SMCCC_TRNG_RND64
+#define MAX_BITS_PER_CALL	(3 * 64UL)
+#else
+#define ARM_SMCCC_TRNG_RND	ARM_SMCCC_TRNG_RND32
+#define MAX_BITS_PER_CALL	(3 * 32UL)
+#endif
+
+/* We don't want to allow the firmware to stall us forever. */
+#define SMCCC_TRNG_MAX_TRIES	20
+
+#define SMCCC_RET_TRNG_INVALID_PARAMETER	-2
+#define SMCCC_RET_TRNG_NO_ENTROPY		-3
+
+static int copy_from_registers(char *buf, struct arm_smccc_res *res,
+			       size_t bytes)
+{
+	unsigned int chunk, copied;
+
+	if (bytes == 0)
+		return 0;
+
+	chunk = min(bytes, sizeof(long));
+	memcpy(buf, &res->a3, chunk);
+	copied = chunk;
+	if (copied >= bytes)
+		return copied;
+
+	chunk = min((bytes - copied), sizeof(long));
+	memcpy(&buf[copied], &res->a2, chunk);
+	copied += chunk;
+	if (copied >= bytes)
+		return copied;
+
+	chunk = min((bytes - copied), sizeof(long));
+	memcpy(&buf[copied], &res->a1, chunk);
+
+	return copied + chunk;
+}
+
+static int smccc_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	struct arm_smccc_res res;
+	u8 *buf = data;
+	unsigned int copied = 0;
+	int tries = 0;
+
+	while (copied < max) {
+		size_t bits = min_t(size_t, (max - copied) * BITS_PER_BYTE,
+				  MAX_BITS_PER_CALL);
+
+		arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_RND, bits, &res);
+
+		switch ((int)res.a0) {
+		case SMCCC_RET_SUCCESS:
+			copied += copy_from_registers(buf + copied, &res,
+						      bits / BITS_PER_BYTE);
+			tries = 0;
+			break;
+		case SMCCC_RET_TRNG_NO_ENTROPY:
+			if (!wait)
+				return copied;
+			tries++;
+			if (tries >= SMCCC_TRNG_MAX_TRIES)
+				return copied;
+			cond_resched();
+			break;
+		default:
+			return -EIO;
+		}
+	}
+
+	return copied;
+}
+
+static int smccc_trng_probe(struct platform_device *pdev)
+{
+	struct hwrng *trng;
+
+	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+	if (!trng)
+		return -ENOMEM;
+
+	trng->name = "smccc_trng";
+	trng->read = smccc_trng_read;
+
+	platform_set_drvdata(pdev, trng);
+
+	return devm_hwrng_register(&pdev->dev, trng);
+}
+
+static struct platform_driver smccc_trng_driver = {
+	.driver = {
+		.name		= "smccc_trng",
+	},
+	.probe		= smccc_trng_probe,
+};
+module_platform_driver(smccc_trng_driver);
+
+MODULE_ALIAS("platform:smccc_trng");
+MODULE_AUTHOR("Andre Przywara");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
new file mode 100644
index 000000000..b8effe77d
--- /dev/null
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2011 Peter Korsgaard <jacmet@sunsite.dk>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/hw_random.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#define TRNG_CR		0x00
+#define TRNG_MR		0x04
+#define TRNG_ISR	0x1c
+#define TRNG_ISR_DATRDY	BIT(0)
+#define TRNG_ODATA	0x50
+
+#define TRNG_KEY	0x524e4700 /* RNG */
+
+#define TRNG_HALFR	BIT(0) /* generate RN every 168 cycles */
+
+struct atmel_trng_data {
+	bool has_half_rate;
+};
+
+struct atmel_trng {
+	struct clk *clk;
+	void __iomem *base;
+	struct hwrng rng;
+	bool has_half_rate;
+};
+
+static bool atmel_trng_wait_ready(struct atmel_trng *trng, bool wait)
+{
+	int ready;
+
+	ready = readl(trng->base + TRNG_ISR) & TRNG_ISR_DATRDY;
+	if (!ready && wait)
+		readl_poll_timeout(trng->base + TRNG_ISR, ready,
+				   ready & TRNG_ISR_DATRDY, 1000, 20000);
+
+	return !!ready;
+}
+
+static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max,
+			   bool wait)
+{
+	struct atmel_trng *trng = container_of(rng, struct atmel_trng, rng);
+	u32 *data = buf;
+	int ret;
+
+	ret = pm_runtime_get_sync((struct device *)trng->rng.priv);
+	if (ret < 0) {
+		pm_runtime_put_sync((struct device *)trng->rng.priv);
+		return ret;
+	}
+
+	ret = atmel_trng_wait_ready(trng, wait);
+	if (!ret)
+		goto out;
+
+	*data = readl(trng->base + TRNG_ODATA);
+	/*
+	 * ensure data ready is only set again AFTER the next data word is ready
+	 * in case it got set between checking ISR and reading ODATA, so we
+	 * don't risk re-reading the same word
+	 */
+	readl(trng->base + TRNG_ISR);
+	ret = 4;
+
+out:
+	pm_runtime_mark_last_busy((struct device *)trng->rng.priv);
+	pm_runtime_put_sync_autosuspend((struct device *)trng->rng.priv);
+	return ret;
+}
+
+static int atmel_trng_init(struct atmel_trng *trng)
+{
+	unsigned long rate;
+	int ret;
+
+	ret = clk_prepare_enable(trng->clk);
+	if (ret)
+		return ret;
+
+	if (trng->has_half_rate) {
+		rate = clk_get_rate(trng->clk);
+
+		/* if peripheral clk is above 100MHz, set HALFR */
+		if (rate > 100000000)
+			writel(TRNG_HALFR, trng->base + TRNG_MR);
+	}
+
+	writel(TRNG_KEY | 1, trng->base + TRNG_CR);
+
+	return 0;
+}
+
+static void atmel_trng_cleanup(struct atmel_trng *trng)
+{
+	writel(TRNG_KEY, trng->base + TRNG_CR);
+	clk_disable_unprepare(trng->clk);
+}
+
+static int atmel_trng_probe(struct platform_device *pdev)
+{
+	struct atmel_trng *trng;
+	const struct atmel_trng_data *data;
+	int ret;
+
+	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+	if (!trng)
+		return -ENOMEM;
+
+	trng->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(trng->base))
+		return PTR_ERR(trng->base);
+
+	trng->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(trng->clk))
+		return PTR_ERR(trng->clk);
+	data = of_device_get_match_data(&pdev->dev);
+	if (!data)
+		return -ENODEV;
+
+	trng->has_half_rate = data->has_half_rate;
+	trng->rng.name = pdev->name;
+	trng->rng.read = atmel_trng_read;
+	trng->rng.priv = (unsigned long)&pdev->dev;
+	platform_set_drvdata(pdev, trng);
+
+#ifndef CONFIG_PM
+	ret = atmel_trng_init(trng);
+	if (ret)
+		return ret;
+#endif
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	ret = devm_hwrng_register(&pdev->dev, &trng->rng);
+	if (ret) {
+		pm_runtime_disable(&pdev->dev);
+		pm_runtime_set_suspended(&pdev->dev);
+#ifndef CONFIG_PM
+		atmel_trng_cleanup(trng);
+#endif
+	}
+
+	return ret;
+}
+
+static int atmel_trng_remove(struct platform_device *pdev)
+{
+	struct atmel_trng *trng = platform_get_drvdata(pdev);
+
+	atmel_trng_cleanup(trng);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
+	return 0;
+}
+
+static int __maybe_unused atmel_trng_runtime_suspend(struct device *dev)
+{
+	struct atmel_trng *trng = dev_get_drvdata(dev);
+
+	atmel_trng_cleanup(trng);
+
+	return 0;
+}
+
+static int __maybe_unused atmel_trng_runtime_resume(struct device *dev)
+{
+	struct atmel_trng *trng = dev_get_drvdata(dev);
+
+	return atmel_trng_init(trng);
+}
+
+static const struct dev_pm_ops __maybe_unused atmel_trng_pm_ops = {
+	SET_RUNTIME_PM_OPS(atmel_trng_runtime_suspend,
+			   atmel_trng_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
+static const struct atmel_trng_data at91sam9g45_config = {
+	.has_half_rate = false,
+};
+
+static const struct atmel_trng_data sam9x60_config = {
+	.has_half_rate = true,
+};
+
+static const struct of_device_id atmel_trng_dt_ids[] = {
+	{
+		.compatible = "atmel,at91sam9g45-trng",
+		.data = &at91sam9g45_config,
+	}, {
+		.compatible = "microchip,sam9x60-trng",
+		.data = &sam9x60_config,
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, atmel_trng_dt_ids);
+
+static struct platform_driver atmel_trng_driver = {
+	.probe		= atmel_trng_probe,
+	.remove		= atmel_trng_remove,
+	.driver		= {
+		.name	= "atmel-trng",
+		.pm	= pm_ptr(&atmel_trng_pm_ops),
+		.of_match_table = atmel_trng_dt_ids,
+	},
+};
+
+module_platform_driver(atmel_trng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
+MODULE_DESCRIPTION("Atmel true random number generator driver");
diff --git a/drivers/char/hw_random/ba431-rng.c b/drivers/char/hw_random/ba431-rng.c
new file mode 100644
index 000000000..5b7ca0416
--- /dev/null
+++ b/drivers/char/hw_random/ba431-rng.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Silex Insight
+
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#define BA431_RESET_DELAY			1 /* usec */
+#define BA431_RESET_READ_STATUS_TIMEOUT		1000 /* usec */
+#define BA431_RESET_READ_STATUS_INTERVAL	10 /* usec */
+#define BA431_READ_RETRY_INTERVAL		1 /* usec */
+
+#define BA431_REG_CTRL				0x00
+#define BA431_REG_FIFO_LEVEL			0x04
+#define BA431_REG_STATUS			0x30
+#define BA431_REG_FIFODATA			0x80
+
+#define BA431_CTRL_ENABLE			BIT(0)
+#define BA431_CTRL_SOFTRESET			BIT(8)
+
+#define BA431_STATUS_STATE_MASK			(BIT(1) | BIT(2) | BIT(3))
+#define BA431_STATUS_STATE_OFFSET		1
+
+enum ba431_state {
+	BA431_STATE_RESET,
+	BA431_STATE_STARTUP,
+	BA431_STATE_FIFOFULLON,
+	BA431_STATE_FIFOFULLOFF,
+	BA431_STATE_RUNNING,
+	BA431_STATE_ERROR
+};
+
+struct ba431_trng {
+	struct device *dev;
+	void __iomem *base;
+	struct hwrng rng;
+	atomic_t reset_pending;
+	struct work_struct reset_work;
+};
+
+static inline u32 ba431_trng_read_reg(struct ba431_trng *ba431, u32 reg)
+{
+	return ioread32(ba431->base + reg);
+}
+
+static inline void ba431_trng_write_reg(struct ba431_trng *ba431, u32 reg,
+					u32 val)
+{
+	iowrite32(val, ba431->base + reg);
+}
+
+static inline enum ba431_state ba431_trng_get_state(struct ba431_trng *ba431)
+{
+	u32 status = ba431_trng_read_reg(ba431, BA431_REG_STATUS);
+
+	return (status & BA431_STATUS_STATE_MASK) >> BA431_STATUS_STATE_OFFSET;
+}
+
+static int ba431_trng_is_in_error(struct ba431_trng *ba431)
+{
+	enum ba431_state state = ba431_trng_get_state(ba431);
+
+	if ((state < BA431_STATE_STARTUP) ||
+	    (state >= BA431_STATE_ERROR))
+		return 1;
+
+	return 0;
+}
+
+static int ba431_trng_reset(struct ba431_trng *ba431)
+{
+	int ret;
+
+	/* Disable interrupts, random generation and enable the softreset */
+	ba431_trng_write_reg(ba431, BA431_REG_CTRL, BA431_CTRL_SOFTRESET);
+	udelay(BA431_RESET_DELAY);
+	ba431_trng_write_reg(ba431, BA431_REG_CTRL, BA431_CTRL_ENABLE);
+
+	/* Wait until the state changed */
+	if (readx_poll_timeout(ba431_trng_is_in_error, ba431, ret, !ret,
+			       BA431_RESET_READ_STATUS_INTERVAL,
+			       BA431_RESET_READ_STATUS_TIMEOUT)) {
+		dev_err(ba431->dev, "reset failed (state: %d)\n",
+			ba431_trng_get_state(ba431));
+		return -ETIMEDOUT;
+	}
+
+	dev_info(ba431->dev, "reset done\n");
+
+	return 0;
+}
+
+static void ba431_trng_reset_work(struct work_struct *work)
+{
+	struct ba431_trng *ba431 = container_of(work, struct ba431_trng,
+						reset_work);
+	ba431_trng_reset(ba431);
+	atomic_set(&ba431->reset_pending, 0);
+}
+
+static void ba431_trng_schedule_reset(struct ba431_trng *ba431)
+{
+	if (atomic_cmpxchg(&ba431->reset_pending, 0, 1))
+		return;
+
+	schedule_work(&ba431->reset_work);
+}
+
+static int ba431_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng);
+	u32 *data = buf;
+	unsigned int level, i;
+	int n = 0;
+
+	while (max > 0) {
+		level = ba431_trng_read_reg(ba431, BA431_REG_FIFO_LEVEL);
+		if (!level) {
+			if (ba431_trng_is_in_error(ba431)) {
+				ba431_trng_schedule_reset(ba431);
+				break;
+			}
+
+			if (!wait)
+				break;
+
+			udelay(BA431_READ_RETRY_INTERVAL);
+			continue;
+		}
+
+		i = level;
+		do {
+			data[n++] = ba431_trng_read_reg(ba431,
+							BA431_REG_FIFODATA);
+			max -= sizeof(*data);
+		} while (--i && (max > 0));
+
+		if (ba431_trng_is_in_error(ba431)) {
+			n -= (level - i);
+			ba431_trng_schedule_reset(ba431);
+			break;
+		}
+	}
+
+	n *= sizeof(data);
+	return (n || !wait) ? n : -EIO;
+}
+
+static void ba431_trng_cleanup(struct hwrng *rng)
+{
+	struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng);
+
+	ba431_trng_write_reg(ba431, BA431_REG_CTRL, 0);
+	cancel_work_sync(&ba431->reset_work);
+}
+
+static int ba431_trng_init(struct hwrng *rng)
+{
+	struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng);
+
+	return ba431_trng_reset(ba431);
+}
+
+static int ba431_trng_probe(struct platform_device *pdev)
+{
+	struct ba431_trng *ba431;
+	int ret;
+
+	ba431 = devm_kzalloc(&pdev->dev, sizeof(*ba431), GFP_KERNEL);
+	if (!ba431)
+		return -ENOMEM;
+
+	ba431->dev = &pdev->dev;
+
+	ba431->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(ba431->base))
+		return PTR_ERR(ba431->base);
+
+	atomic_set(&ba431->reset_pending, 0);
+	INIT_WORK(&ba431->reset_work, ba431_trng_reset_work);
+	ba431->rng.name = pdev->name;
+	ba431->rng.init = ba431_trng_init;
+	ba431->rng.cleanup = ba431_trng_cleanup;
+	ba431->rng.read = ba431_trng_read;
+
+	platform_set_drvdata(pdev, ba431);
+
+	ret = devm_hwrng_register(&pdev->dev, &ba431->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "BA431 registration failed (%d)\n", ret);
+		return ret;
+	}
+
+	dev_info(&pdev->dev, "BA431 TRNG registered\n");
+
+	return 0;
+}
+
+static const struct of_device_id ba431_trng_dt_ids[] = {
+	{ .compatible = "silex-insight,ba431-rng", .data = NULL },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ba431_trng_dt_ids);
+
+static struct platform_driver ba431_trng_driver = {
+	.driver = {
+		.name = "ba431-rng",
+		.of_match_table = ba431_trng_dt_ids,
+	},
+	.probe = ba431_trng_probe,
+};
+
+module_platform_driver(ba431_trng_driver);
+
+MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
+MODULE_DESCRIPTION("TRNG driver for Silex Insight BA431");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
new file mode 100644
index 000000000..634eab477
--- /dev/null
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ * Copyright (c) 2013 Lubomir Rintel
+ */
+
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+
+#define RNG_CTRL	0x0
+#define RNG_STATUS	0x4
+#define RNG_DATA	0x8
+#define RNG_INT_MASK	0x10
+
+/* enable rng */
+#define RNG_RBGEN	0x1
+
+/* the initial numbers generated are "less random" so will be discarded */
+#define RNG_WARMUP_COUNT 0x40000
+
+#define RNG_INT_OFF	0x1
+
+struct bcm2835_rng_priv {
+	struct hwrng rng;
+	void __iomem *base;
+	bool mask_interrupts;
+	struct clk *clk;
+	struct reset_control *reset;
+};
+
+static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
+{
+	return container_of(rng, struct bcm2835_rng_priv, rng);
+}
+
+static inline u32 rng_readl(struct bcm2835_rng_priv *priv, u32 offset)
+{
+	/* MIPS chips strapped for BE will automagically configure the
+	 * peripheral registers for CPU-native byte order.
+	 */
+	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+		return __raw_readl(priv->base + offset);
+	else
+		return readl(priv->base + offset);
+}
+
+static inline void rng_writel(struct bcm2835_rng_priv *priv, u32 val,
+			      u32 offset)
+{
+	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+		__raw_writel(val, priv->base + offset);
+	else
+		writel(val, priv->base + offset);
+}
+
+static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
+			       bool wait)
+{
+	struct bcm2835_rng_priv *priv = to_rng_priv(rng);
+	u32 max_words = max / sizeof(u32);
+	u32 num_words, count;
+
+	while ((rng_readl(priv, RNG_STATUS) >> 24) == 0) {
+		if (!wait)
+			return 0;
+		hwrng_yield(rng);
+	}
+
+	num_words = rng_readl(priv, RNG_STATUS) >> 24;
+	if (num_words > max_words)
+		num_words = max_words;
+
+	for (count = 0; count < num_words; count++)
+		((u32 *)buf)[count] = rng_readl(priv, RNG_DATA);
+
+	return num_words * sizeof(u32);
+}
+
+static int bcm2835_rng_init(struct hwrng *rng)
+{
+	struct bcm2835_rng_priv *priv = to_rng_priv(rng);
+	int ret = 0;
+	u32 val;
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret)
+		return ret;
+
+	ret = reset_control_reset(priv->reset);
+	if (ret)
+		return ret;
+
+	if (priv->mask_interrupts) {
+		/* mask the interrupt */
+		val = rng_readl(priv, RNG_INT_MASK);
+		val |= RNG_INT_OFF;
+		rng_writel(priv, val, RNG_INT_MASK);
+	}
+
+	/* set warm-up count & enable */
+	rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS);
+	rng_writel(priv, RNG_RBGEN, RNG_CTRL);
+
+	return ret;
+}
+
+static void bcm2835_rng_cleanup(struct hwrng *rng)
+{
+	struct bcm2835_rng_priv *priv = to_rng_priv(rng);
+
+	/* disable rng hardware */
+	rng_writel(priv, 0, RNG_CTRL);
+
+	clk_disable_unprepare(priv->clk);
+}
+
+struct bcm2835_rng_of_data {
+	bool mask_interrupts;
+};
+
+static const struct bcm2835_rng_of_data nsp_rng_of_data = {
+	.mask_interrupts = true,
+};
+
+static const struct of_device_id bcm2835_rng_of_match[] = {
+	{ .compatible = "brcm,bcm2835-rng"},
+	{ .compatible = "brcm,bcm-nsp-rng", .data = &nsp_rng_of_data },
+	{ .compatible = "brcm,bcm5301x-rng", .data = &nsp_rng_of_data },
+	{ .compatible = "brcm,bcm6368-rng"},
+	{},
+};
+
+static int bcm2835_rng_probe(struct platform_device *pdev)
+{
+	const struct bcm2835_rng_of_data *of_data;
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *rng_id;
+	struct bcm2835_rng_priv *priv;
+	int err;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	/* map peripheral */
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	/* Clock is optional on most platforms */
+	priv->clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL);
+	if (IS_ERR(priv->reset))
+		return PTR_ERR(priv->reset);
+
+	priv->rng.name = pdev->name;
+	priv->rng.init = bcm2835_rng_init;
+	priv->rng.read = bcm2835_rng_read;
+	priv->rng.cleanup = bcm2835_rng_cleanup;
+
+	if (dev_of_node(dev)) {
+		rng_id = of_match_node(bcm2835_rng_of_match, dev->of_node);
+		if (!rng_id)
+			return -EINVAL;
+
+		/* Check for rng init function, execute it */
+		of_data = rng_id->data;
+		if (of_data)
+			priv->mask_interrupts = of_data->mask_interrupts;
+	}
+
+	/* register driver */
+	err = devm_hwrng_register(dev, &priv->rng);
+	if (err)
+		dev_err(dev, "hwrng registration failed\n");
+	else
+		dev_info(dev, "hwrng registered\n");
+
+	return err;
+}
+
+MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match);
+
+static const struct platform_device_id bcm2835_rng_devtype[] = {
+	{ .name = "bcm2835-rng" },
+	{ .name = "bcm63xx-rng" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, bcm2835_rng_devtype);
+
+static struct platform_driver bcm2835_rng_driver = {
+	.driver = {
+		.name = "bcm2835-rng",
+		.of_match_table = bcm2835_rng_of_match,
+	},
+	.probe		= bcm2835_rng_probe,
+	.id_table	= bcm2835_rng_devtype,
+};
+module_platform_driver(bcm2835_rng_driver);
+
+MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
+MODULE_DESCRIPTION("BCM2835 Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/cavium-rng-vf.c b/drivers/char/hw_random/cavium-rng-vf.c
new file mode 100644
index 000000000..7c55f4cf4
--- /dev/null
+++ b/drivers/char/hw_random/cavium-rng-vf.c
@@ -0,0 +1,270 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware Random Number Generator support.
+ * Cavium Thunder, Marvell OcteonTx/Tx2 processor families.
+ *
+ * Copyright (C) 2016 Cavium, Inc.
+ */
+
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+
+#include <asm/arch_timer.h>
+
+/* PCI device IDs */
+#define	PCI_DEVID_CAVIUM_RNG_PF		0xA018
+#define	PCI_DEVID_CAVIUM_RNG_VF		0xA033
+
+#define HEALTH_STATUS_REG		0x38
+
+/* RST device info */
+#define PCI_DEVICE_ID_RST_OTX2		0xA085
+#define RST_BOOT_REG			0x1600ULL
+#define CLOCK_BASE_RATE			50000000ULL
+#define MSEC_TO_NSEC(x)			(x * 1000000)
+
+struct cavium_rng {
+	struct hwrng ops;
+	void __iomem *result;
+	void __iomem *pf_regbase;
+	struct pci_dev *pdev;
+	u64  clock_rate;
+	u64  prev_error;
+	u64  prev_time;
+};
+
+static inline bool is_octeontx(struct pci_dev *pdev)
+{
+	if (midr_is_cpu_model_range(read_cpuid_id(), MIDR_THUNDERX_83XX,
+				    MIDR_CPU_VAR_REV(0, 0),
+				    MIDR_CPU_VAR_REV(3, 0)) ||
+	    midr_is_cpu_model_range(read_cpuid_id(), MIDR_THUNDERX_81XX,
+				    MIDR_CPU_VAR_REV(0, 0),
+				    MIDR_CPU_VAR_REV(3, 0)) ||
+	    midr_is_cpu_model_range(read_cpuid_id(), MIDR_THUNDERX,
+				    MIDR_CPU_VAR_REV(0, 0),
+				    MIDR_CPU_VAR_REV(3, 0)))
+		return true;
+
+	return false;
+}
+
+static u64 rng_get_coprocessor_clkrate(void)
+{
+	u64 ret = CLOCK_BASE_RATE * 16; /* Assume 800Mhz as default */
+	struct pci_dev *pdev;
+	void __iomem *base;
+
+	pdev = pci_get_device(PCI_VENDOR_ID_CAVIUM,
+			      PCI_DEVICE_ID_RST_OTX2, NULL);
+	if (!pdev)
+		goto error;
+
+	base = pci_ioremap_bar(pdev, 0);
+	if (!base)
+		goto error_put_pdev;
+
+	/* RST: PNR_MUL * 50Mhz gives clockrate */
+	ret = CLOCK_BASE_RATE * ((readq(base + RST_BOOT_REG) >> 33) & 0x3F);
+
+	iounmap(base);
+
+error_put_pdev:
+	pci_dev_put(pdev);
+
+error:
+	return ret;
+}
+
+static int check_rng_health(struct cavium_rng *rng)
+{
+	u64 cur_err, cur_time;
+	u64 status, cycles;
+	u64 time_elapsed;
+
+
+	/* Skip checking health for OcteonTx */
+	if (!rng->pf_regbase)
+		return 0;
+
+	status = readq(rng->pf_regbase + HEALTH_STATUS_REG);
+	if (status & BIT_ULL(0)) {
+		dev_err(&rng->pdev->dev, "HWRNG: Startup health test failed\n");
+		return -EIO;
+	}
+
+	cycles = status >> 1;
+	if (!cycles)
+		return 0;
+
+	cur_time = arch_timer_read_counter();
+
+	/* RNM_HEALTH_STATUS[CYCLES_SINCE_HEALTH_FAILURE]
+	 * Number of coprocessor cycles times 2 since the last failure.
+	 * This field doesn't get cleared/updated until another failure.
+	 */
+	cycles = cycles / 2;
+	cur_err = (cycles * 1000000000) / rng->clock_rate; /* In nanosec */
+
+	/* Ignore errors that happenned a long time ago, these
+	 * are most likely false positive errors.
+	 */
+	if (cur_err > MSEC_TO_NSEC(10)) {
+		rng->prev_error = 0;
+		rng->prev_time = 0;
+		return 0;
+	}
+
+	if (rng->prev_error) {
+		/* Calculate time elapsed since last error
+		 * '1' tick of CNTVCT is 10ns, since it runs at 100Mhz.
+		 */
+		time_elapsed = (cur_time - rng->prev_time) * 10;
+		time_elapsed += rng->prev_error;
+
+		/* Check if current error is a new one or the old one itself.
+		 * If error is a new one then consider there is a persistent
+		 * issue with entropy, declare hardware failure.
+		 */
+		if (cur_err < time_elapsed) {
+			dev_err(&rng->pdev->dev, "HWRNG failure detected\n");
+			rng->prev_error = cur_err;
+			rng->prev_time = cur_time;
+			return -EIO;
+		}
+	}
+
+	rng->prev_error = cur_err;
+	rng->prev_time = cur_time;
+	return 0;
+}
+
+/* Read data from the RNG unit */
+static int cavium_rng_read(struct hwrng *rng, void *dat, size_t max, bool wait)
+{
+	struct cavium_rng *p = container_of(rng, struct cavium_rng, ops);
+	unsigned int size = max;
+	int err = 0;
+
+	err = check_rng_health(p);
+	if (err)
+		return err;
+
+	while (size >= 8) {
+		*((u64 *)dat) = readq(p->result);
+		size -= 8;
+		dat += 8;
+	}
+	while (size > 0) {
+		*((u8 *)dat) = readb(p->result);
+		size--;
+		dat++;
+	}
+	return max;
+}
+
+static int cavium_map_pf_regs(struct cavium_rng *rng)
+{
+	struct pci_dev *pdev;
+
+	/* Health status is not supported on 83xx, skip mapping PF CSRs */
+	if (is_octeontx(rng->pdev)) {
+		rng->pf_regbase = NULL;
+		return 0;
+	}
+
+	pdev = pci_get_device(PCI_VENDOR_ID_CAVIUM,
+			      PCI_DEVID_CAVIUM_RNG_PF, NULL);
+	if (!pdev) {
+		pr_err("Cannot find RNG PF device\n");
+		return -EIO;
+	}
+
+	rng->pf_regbase = ioremap(pci_resource_start(pdev, 0),
+				  pci_resource_len(pdev, 0));
+	if (!rng->pf_regbase) {
+		dev_err(&pdev->dev, "Failed to map PF CSR region\n");
+		pci_dev_put(pdev);
+		return -ENOMEM;
+	}
+
+	pci_dev_put(pdev);
+
+	/* Get co-processor clock rate */
+	rng->clock_rate = rng_get_coprocessor_clkrate();
+
+	return 0;
+}
+
+/* Map Cavium RNG to an HWRNG object */
+static int cavium_rng_probe_vf(struct	pci_dev		*pdev,
+			 const struct	pci_device_id	*id)
+{
+	struct	cavium_rng *rng;
+	int	ret;
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	rng->pdev = pdev;
+
+	/* Map the RNG result */
+	rng->result = pcim_iomap(pdev, 0, 0);
+	if (!rng->result) {
+		dev_err(&pdev->dev, "Error iomap failed retrieving result.\n");
+		return -ENOMEM;
+	}
+
+	rng->ops.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+				       "cavium-rng-%s", dev_name(&pdev->dev));
+	if (!rng->ops.name)
+		return -ENOMEM;
+
+	rng->ops.read    = cavium_rng_read;
+	rng->ops.quality = 1000;
+
+	pci_set_drvdata(pdev, rng);
+
+	/* Health status is available only at PF, hence map PF registers. */
+	ret = cavium_map_pf_regs(rng);
+	if (ret)
+		return ret;
+
+	ret = devm_hwrng_register(&pdev->dev, &rng->ops);
+	if (ret) {
+		dev_err(&pdev->dev, "Error registering device as HWRNG.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Remove the VF */
+static void cavium_rng_remove_vf(struct pci_dev *pdev)
+{
+	struct cavium_rng *rng;
+
+	rng = pci_get_drvdata(pdev);
+	iounmap(rng->pf_regbase);
+}
+
+static const struct pci_device_id cavium_rng_vf_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_CAVIUM_RNG_VF) },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, cavium_rng_vf_id_table);
+
+static struct pci_driver cavium_rng_vf_driver = {
+	.name		= "cavium_rng_vf",
+	.id_table	= cavium_rng_vf_id_table,
+	.probe		= cavium_rng_probe_vf,
+	.remove		= cavium_rng_remove_vf,
+};
+module_pci_driver(cavium_rng_vf_driver);
+
+MODULE_AUTHOR("Omer Khaliq <okhaliq@caviumnetworks.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/cavium-rng.c b/drivers/char/hw_random/cavium-rng.c
new file mode 100644
index 000000000..b96579222
--- /dev/null
+++ b/drivers/char/hw_random/cavium-rng.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware Random Number Generator support.
+ * Cavium Thunder, Marvell OcteonTx/Tx2 processor families.
+ *
+ * Copyright (C) 2016 Cavium, Inc.
+ */
+
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+
+#define THUNDERX_RNM_ENT_EN     0x1
+#define THUNDERX_RNM_RNG_EN     0x2
+
+struct cavium_rng_pf {
+	void __iomem *control_status;
+};
+
+/* Enable the RNG hardware and activate the VF */
+static int cavium_rng_probe(struct pci_dev *pdev,
+			const struct pci_device_id *id)
+{
+	struct	cavium_rng_pf *rng;
+	int	iov_err;
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	/*Map the RNG control */
+	rng->control_status = pcim_iomap(pdev, 0, 0);
+	if (!rng->control_status) {
+		dev_err(&pdev->dev,
+			"Error iomap failed retrieving control_status.\n");
+		return -ENOMEM;
+	}
+
+	/* Enable the RNG hardware and entropy source */
+	writeq(THUNDERX_RNM_RNG_EN | THUNDERX_RNM_ENT_EN,
+		rng->control_status);
+
+	pci_set_drvdata(pdev, rng);
+
+	/* Enable the Cavium RNG as a VF */
+	iov_err = pci_enable_sriov(pdev, 1);
+	if (iov_err != 0) {
+		/* Disable the RNG hardware and entropy source */
+		writeq(0, rng->control_status);
+		dev_err(&pdev->dev,
+			"Error initializing RNG virtual function,(%i).\n",
+			iov_err);
+		return iov_err;
+	}
+
+	return 0;
+}
+
+/* Disable VF and RNG Hardware */
+static void cavium_rng_remove(struct pci_dev *pdev)
+{
+	struct cavium_rng_pf *rng;
+
+	rng = pci_get_drvdata(pdev);
+
+	/* Remove the VF */
+	pci_disable_sriov(pdev);
+
+	/* Disable the RNG hardware and entropy source */
+	writeq(0, rng->control_status);
+}
+
+static const struct pci_device_id cavium_rng_pf_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa018), 0, 0, 0}, /* Thunder RNM */
+	{0,},
+};
+
+MODULE_DEVICE_TABLE(pci, cavium_rng_pf_id_table);
+
+static struct pci_driver cavium_rng_pf_driver = {
+	.name		= "cavium_rng_pf",
+	.id_table	= cavium_rng_pf_id_table,
+	.probe		= cavium_rng_probe,
+	.remove		= cavium_rng_remove,
+};
+
+module_pci_driver(cavium_rng_pf_driver);
+MODULE_AUTHOR("Omer Khaliq <okhaliq@caviumnetworks.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/cctrng.c b/drivers/char/hw_random/cctrng.c
new file mode 100644
index 000000000..302ffa354
--- /dev/null
+++ b/drivers/char/hw_random/cctrng.c
@@ -0,0 +1,720 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2019-2020 ARM Limited or its affiliates. */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/workqueue.h>
+#include <linux/circ_buf.h>
+#include <linux/completion.h>
+#include <linux/of.h>
+#include <linux/bitfield.h>
+#include <linux/fips.h>
+
+#include "cctrng.h"
+
+#define CC_REG_LOW(name)  (name ## _BIT_SHIFT)
+#define CC_REG_HIGH(name) (CC_REG_LOW(name) + name ## _BIT_SIZE - 1)
+#define CC_GENMASK(name)  GENMASK(CC_REG_HIGH(name), CC_REG_LOW(name))
+
+#define CC_REG_FLD_GET(reg_name, fld_name, reg_val)     \
+	(FIELD_GET(CC_GENMASK(CC_ ## reg_name ## _ ## fld_name), reg_val))
+
+#define CC_HW_RESET_LOOP_COUNT 10
+#define CC_TRNG_SUSPEND_TIMEOUT 3000
+
+/* data circular buffer in words must be:
+ *  - of a power-of-2 size (limitation of circ_buf.h macros)
+ *  - at least 6, the size generated in the EHR according to HW implementation
+ */
+#define CCTRNG_DATA_BUF_WORDS 32
+
+/* The timeout for the TRNG operation should be calculated with the formula:
+ * Timeout = EHR_NUM * VN_COEFF * EHR_LENGTH * SAMPLE_CNT * SCALE_VALUE
+ * while:
+ *  - SAMPLE_CNT is input value from the characterisation process
+ *  - all the rest are constants
+ */
+#define EHR_NUM 1
+#define VN_COEFF 4
+#define EHR_LENGTH CC_TRNG_EHR_IN_BITS
+#define SCALE_VALUE 2
+#define CCTRNG_TIMEOUT(smpl_cnt) \
+	(EHR_NUM * VN_COEFF * EHR_LENGTH * smpl_cnt * SCALE_VALUE)
+
+struct cctrng_drvdata {
+	struct platform_device *pdev;
+	void __iomem *cc_base;
+	struct clk *clk;
+	struct hwrng rng;
+	u32 active_rosc;
+	/* Sampling interval for each ring oscillator:
+	 * count of ring oscillator cycles between consecutive bits sampling.
+	 * Value of 0 indicates non-valid rosc
+	 */
+	u32 smpl_ratio[CC_TRNG_NUM_OF_ROSCS];
+
+	u32 data_buf[CCTRNG_DATA_BUF_WORDS];
+	struct circ_buf circ;
+	struct work_struct compwork;
+	struct work_struct startwork;
+
+	/* pending_hw - 1 when HW is pending, 0 when it is idle */
+	atomic_t pending_hw;
+
+	/* protects against multiple concurrent consumers of data_buf */
+	spinlock_t read_lock;
+};
+
+
+/* functions for write/read CC registers */
+static inline void cc_iowrite(struct cctrng_drvdata *drvdata, u32 reg, u32 val)
+{
+	iowrite32(val, (drvdata->cc_base + reg));
+}
+static inline u32 cc_ioread(struct cctrng_drvdata *drvdata, u32 reg)
+{
+	return ioread32(drvdata->cc_base + reg);
+}
+
+
+static int cc_trng_pm_get(struct device *dev)
+{
+	int rc = 0;
+
+	rc = pm_runtime_get_sync(dev);
+
+	/* pm_runtime_get_sync() can return 1 as a valid return code */
+	return (rc == 1 ? 0 : rc);
+}
+
+static void cc_trng_pm_put_suspend(struct device *dev)
+{
+	int rc = 0;
+
+	pm_runtime_mark_last_busy(dev);
+	rc = pm_runtime_put_autosuspend(dev);
+	if (rc)
+		dev_err(dev, "pm_runtime_put_autosuspend returned %x\n", rc);
+}
+
+static int cc_trng_pm_init(struct cctrng_drvdata *drvdata)
+{
+	struct device *dev = &(drvdata->pdev->dev);
+
+	/* must be before the enabling to avoid redundant suspending */
+	pm_runtime_set_autosuspend_delay(dev, CC_TRNG_SUSPEND_TIMEOUT);
+	pm_runtime_use_autosuspend(dev);
+	/* set us as active - note we won't do PM ops until cc_trng_pm_go()! */
+	return pm_runtime_set_active(dev);
+}
+
+static void cc_trng_pm_go(struct cctrng_drvdata *drvdata)
+{
+	struct device *dev = &(drvdata->pdev->dev);
+
+	/* enable the PM module*/
+	pm_runtime_enable(dev);
+}
+
+static void cc_trng_pm_fini(struct cctrng_drvdata *drvdata)
+{
+	struct device *dev = &(drvdata->pdev->dev);
+
+	pm_runtime_disable(dev);
+}
+
+
+static inline int cc_trng_parse_sampling_ratio(struct cctrng_drvdata *drvdata)
+{
+	struct device *dev = &(drvdata->pdev->dev);
+	struct device_node *np = drvdata->pdev->dev.of_node;
+	int rc;
+	int i;
+	/* ret will be set to 0 if at least one rosc has (sampling ratio > 0) */
+	int ret = -EINVAL;
+
+	rc = of_property_read_u32_array(np, "arm,rosc-ratio",
+					drvdata->smpl_ratio,
+					CC_TRNG_NUM_OF_ROSCS);
+	if (rc) {
+		/* arm,rosc-ratio was not found in device tree */
+		return rc;
+	}
+
+	/* verify that at least one rosc has (sampling ratio > 0) */
+	for (i = 0; i < CC_TRNG_NUM_OF_ROSCS; ++i) {
+		dev_dbg(dev, "rosc %d sampling ratio %u",
+			i, drvdata->smpl_ratio[i]);
+
+		if (drvdata->smpl_ratio[i] > 0)
+			ret = 0;
+	}
+
+	return ret;
+}
+
+static int cc_trng_change_rosc(struct cctrng_drvdata *drvdata)
+{
+	struct device *dev = &(drvdata->pdev->dev);
+
+	dev_dbg(dev, "cctrng change rosc (was %d)\n", drvdata->active_rosc);
+	drvdata->active_rosc += 1;
+
+	while (drvdata->active_rosc < CC_TRNG_NUM_OF_ROSCS) {
+		if (drvdata->smpl_ratio[drvdata->active_rosc] > 0)
+			return 0;
+
+		drvdata->active_rosc += 1;
+	}
+	return -EINVAL;
+}
+
+
+static void cc_trng_enable_rnd_source(struct cctrng_drvdata *drvdata)
+{
+	u32 max_cycles;
+
+	/* Set watchdog threshold to maximal allowed time (in CPU cycles) */
+	max_cycles = CCTRNG_TIMEOUT(drvdata->smpl_ratio[drvdata->active_rosc]);
+	cc_iowrite(drvdata, CC_RNG_WATCHDOG_VAL_REG_OFFSET, max_cycles);
+
+	/* enable the RND source */
+	cc_iowrite(drvdata, CC_RND_SOURCE_ENABLE_REG_OFFSET, 0x1);
+
+	/* unmask RNG interrupts */
+	cc_iowrite(drvdata, CC_RNG_IMR_REG_OFFSET, (u32)~CC_RNG_INT_MASK);
+}
+
+
+/* increase circular data buffer index (head/tail) */
+static inline void circ_idx_inc(int *idx, int bytes)
+{
+	*idx += (bytes + 3) >> 2;
+	*idx &= (CCTRNG_DATA_BUF_WORDS - 1);
+}
+
+static inline size_t circ_buf_space(struct cctrng_drvdata *drvdata)
+{
+	return CIRC_SPACE(drvdata->circ.head,
+			  drvdata->circ.tail, CCTRNG_DATA_BUF_WORDS);
+
+}
+
+static int cctrng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	/* current implementation ignores "wait" */
+
+	struct cctrng_drvdata *drvdata = (struct cctrng_drvdata *)rng->priv;
+	struct device *dev = &(drvdata->pdev->dev);
+	u32 *buf = (u32 *)drvdata->circ.buf;
+	size_t copied = 0;
+	size_t cnt_w;
+	size_t size;
+	size_t left;
+
+	if (!spin_trylock(&drvdata->read_lock)) {
+		/* concurrent consumers from data_buf cannot be served */
+		dev_dbg_ratelimited(dev, "unable to hold lock\n");
+		return 0;
+	}
+
+	/* copy till end of data buffer (without wrap back) */
+	cnt_w = CIRC_CNT_TO_END(drvdata->circ.head,
+				drvdata->circ.tail, CCTRNG_DATA_BUF_WORDS);
+	size = min((cnt_w<<2), max);
+	memcpy(data, &(buf[drvdata->circ.tail]), size);
+	copied = size;
+	circ_idx_inc(&drvdata->circ.tail, size);
+	/* copy rest of data in data buffer */
+	left = max - copied;
+	if (left > 0) {
+		cnt_w = CIRC_CNT(drvdata->circ.head,
+				 drvdata->circ.tail, CCTRNG_DATA_BUF_WORDS);
+		size = min((cnt_w<<2), left);
+		memcpy(data, &(buf[drvdata->circ.tail]), size);
+		copied += size;
+		circ_idx_inc(&drvdata->circ.tail, size);
+	}
+
+	spin_unlock(&drvdata->read_lock);
+
+	if (circ_buf_space(drvdata) >= CC_TRNG_EHR_IN_WORDS) {
+		if (atomic_cmpxchg(&drvdata->pending_hw, 0, 1) == 0) {
+			/* re-check space in buffer to avoid potential race */
+			if (circ_buf_space(drvdata) >= CC_TRNG_EHR_IN_WORDS) {
+				/* increment device's usage counter */
+				int rc = cc_trng_pm_get(dev);
+
+				if (rc) {
+					dev_err(dev,
+						"cc_trng_pm_get returned %x\n",
+						rc);
+					return rc;
+				}
+
+				/* schedule execution of deferred work handler
+				 * for filling of data buffer
+				 */
+				schedule_work(&drvdata->startwork);
+			} else {
+				atomic_set(&drvdata->pending_hw, 0);
+			}
+		}
+	}
+
+	return copied;
+}
+
+static void cc_trng_hw_trigger(struct cctrng_drvdata *drvdata)
+{
+	u32 tmp_smpl_cnt = 0;
+	struct device *dev = &(drvdata->pdev->dev);
+
+	dev_dbg(dev, "cctrng hw trigger.\n");
+
+	/* enable the HW RND clock */
+	cc_iowrite(drvdata, CC_RNG_CLK_ENABLE_REG_OFFSET, 0x1);
+
+	/* do software reset */
+	cc_iowrite(drvdata, CC_RNG_SW_RESET_REG_OFFSET, 0x1);
+	/* in order to verify that the reset has completed,
+	 * the sample count need to be verified
+	 */
+	do {
+		/* enable the HW RND clock   */
+		cc_iowrite(drvdata, CC_RNG_CLK_ENABLE_REG_OFFSET, 0x1);
+
+		/* set sampling ratio (rng_clocks) between consecutive bits */
+		cc_iowrite(drvdata, CC_SAMPLE_CNT1_REG_OFFSET,
+			   drvdata->smpl_ratio[drvdata->active_rosc]);
+
+		/* read the sampling ratio  */
+		tmp_smpl_cnt = cc_ioread(drvdata, CC_SAMPLE_CNT1_REG_OFFSET);
+
+	} while (tmp_smpl_cnt != drvdata->smpl_ratio[drvdata->active_rosc]);
+
+	/* disable the RND source for setting new parameters in HW */
+	cc_iowrite(drvdata, CC_RND_SOURCE_ENABLE_REG_OFFSET, 0);
+
+	cc_iowrite(drvdata, CC_RNG_ICR_REG_OFFSET, 0xFFFFFFFF);
+
+	cc_iowrite(drvdata, CC_TRNG_CONFIG_REG_OFFSET, drvdata->active_rosc);
+
+	/* Debug Control register: set to 0 - no bypasses */
+	cc_iowrite(drvdata, CC_TRNG_DEBUG_CONTROL_REG_OFFSET, 0);
+
+	cc_trng_enable_rnd_source(drvdata);
+}
+
+static void cc_trng_compwork_handler(struct work_struct *w)
+{
+	u32 isr = 0;
+	u32 ehr_valid = 0;
+	struct cctrng_drvdata *drvdata =
+			container_of(w, struct cctrng_drvdata, compwork);
+	struct device *dev = &(drvdata->pdev->dev);
+	int i;
+
+	/* stop DMA and the RNG source */
+	cc_iowrite(drvdata, CC_RNG_DMA_ENABLE_REG_OFFSET, 0);
+	cc_iowrite(drvdata, CC_RND_SOURCE_ENABLE_REG_OFFSET, 0);
+
+	/* read RNG_ISR and check for errors */
+	isr = cc_ioread(drvdata, CC_RNG_ISR_REG_OFFSET);
+	ehr_valid = CC_REG_FLD_GET(RNG_ISR, EHR_VALID, isr);
+	dev_dbg(dev, "Got RNG_ISR=0x%08X (EHR_VALID=%u)\n", isr, ehr_valid);
+
+	if (fips_enabled && CC_REG_FLD_GET(RNG_ISR, CRNGT_ERR, isr)) {
+		fips_fail_notify();
+		/* FIPS error is fatal */
+		panic("Got HW CRNGT error while fips is enabled!\n");
+	}
+
+	/* Clear all pending RNG interrupts */
+	cc_iowrite(drvdata, CC_RNG_ICR_REG_OFFSET, isr);
+
+
+	if (!ehr_valid) {
+		/* in case of AUTOCORR/TIMEOUT error, try the next ROSC */
+		if (CC_REG_FLD_GET(RNG_ISR, AUTOCORR_ERR, isr) ||
+				CC_REG_FLD_GET(RNG_ISR, WATCHDOG, isr)) {
+			dev_dbg(dev, "cctrng autocorr/timeout error.\n");
+			goto next_rosc;
+		}
+
+		/* in case of VN error, ignore it */
+	}
+
+	/* read EHR data from registers */
+	for (i = 0; i < CC_TRNG_EHR_IN_WORDS; i++) {
+		/* calc word ptr in data_buf */
+		u32 *buf = (u32 *)drvdata->circ.buf;
+
+		buf[drvdata->circ.head] = cc_ioread(drvdata,
+				CC_EHR_DATA_0_REG_OFFSET + (i*sizeof(u32)));
+
+		/* EHR_DATA registers are cleared on read. In case 0 value was
+		 * returned, restart the entropy collection.
+		 */
+		if (buf[drvdata->circ.head] == 0) {
+			dev_dbg(dev, "Got 0 value in EHR. active_rosc %u\n",
+				drvdata->active_rosc);
+			goto next_rosc;
+		}
+
+		circ_idx_inc(&drvdata->circ.head, 1<<2);
+	}
+
+	atomic_set(&drvdata->pending_hw, 0);
+
+	/* continue to fill data buffer if needed */
+	if (circ_buf_space(drvdata) >= CC_TRNG_EHR_IN_WORDS) {
+		if (atomic_cmpxchg(&drvdata->pending_hw, 0, 1) == 0) {
+			/* Re-enable rnd source */
+			cc_trng_enable_rnd_source(drvdata);
+			return;
+		}
+	}
+
+	cc_trng_pm_put_suspend(dev);
+
+	dev_dbg(dev, "compwork handler done\n");
+	return;
+
+next_rosc:
+	if ((circ_buf_space(drvdata) >= CC_TRNG_EHR_IN_WORDS) &&
+			(cc_trng_change_rosc(drvdata) == 0)) {
+		/* trigger trng hw with next rosc */
+		cc_trng_hw_trigger(drvdata);
+	} else {
+		atomic_set(&drvdata->pending_hw, 0);
+		cc_trng_pm_put_suspend(dev);
+	}
+}
+
+static irqreturn_t cc_isr(int irq, void *dev_id)
+{
+	struct cctrng_drvdata *drvdata = (struct cctrng_drvdata *)dev_id;
+	struct device *dev = &(drvdata->pdev->dev);
+	u32 irr;
+
+	/* if driver suspended return, probably shared interrupt */
+	if (pm_runtime_suspended(dev))
+		return IRQ_NONE;
+
+	/* read the interrupt status */
+	irr = cc_ioread(drvdata, CC_HOST_RGF_IRR_REG_OFFSET);
+	dev_dbg(dev, "Got IRR=0x%08X\n", irr);
+
+	if (irr == 0) /* Probably shared interrupt line */
+		return IRQ_NONE;
+
+	/* clear interrupt - must be before processing events */
+	cc_iowrite(drvdata, CC_HOST_RGF_ICR_REG_OFFSET, irr);
+
+	/* RNG interrupt - most probable */
+	if (irr & CC_HOST_RNG_IRQ_MASK) {
+		/* Mask RNG interrupts - will be unmasked in deferred work */
+		cc_iowrite(drvdata, CC_RNG_IMR_REG_OFFSET, 0xFFFFFFFF);
+
+		/* We clear RNG interrupt here,
+		 * to avoid it from firing as we'll unmask RNG interrupts.
+		 */
+		cc_iowrite(drvdata, CC_HOST_RGF_ICR_REG_OFFSET,
+			   CC_HOST_RNG_IRQ_MASK);
+
+		irr &= ~CC_HOST_RNG_IRQ_MASK;
+
+		/* schedule execution of deferred work handler */
+		schedule_work(&drvdata->compwork);
+	}
+
+	if (irr) {
+		dev_dbg_ratelimited(dev,
+				"IRR includes unknown cause bits (0x%08X)\n",
+				irr);
+		/* Just warning */
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void cc_trng_startwork_handler(struct work_struct *w)
+{
+	struct cctrng_drvdata *drvdata =
+			container_of(w, struct cctrng_drvdata, startwork);
+
+	drvdata->active_rosc = 0;
+	cc_trng_hw_trigger(drvdata);
+}
+
+
+static int cc_trng_clk_init(struct cctrng_drvdata *drvdata)
+{
+	struct clk *clk;
+	struct device *dev = &(drvdata->pdev->dev);
+	int rc = 0;
+
+	clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(clk))
+		return dev_err_probe(dev, PTR_ERR(clk),
+				     "Error getting clock\n");
+
+	drvdata->clk = clk;
+
+	rc = clk_prepare_enable(drvdata->clk);
+	if (rc) {
+		dev_err(dev, "Failed to enable clock\n");
+		return rc;
+	}
+
+	return 0;
+}
+
+static void cc_trng_clk_fini(struct cctrng_drvdata *drvdata)
+{
+	clk_disable_unprepare(drvdata->clk);
+}
+
+
+static int cctrng_probe(struct platform_device *pdev)
+{
+	struct cctrng_drvdata *drvdata;
+	struct device *dev = &pdev->dev;
+	int rc = 0;
+	u32 val;
+	int irq;
+
+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->rng.name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+	if (!drvdata->rng.name)
+		return -ENOMEM;
+
+	drvdata->rng.read = cctrng_read;
+	drvdata->rng.priv = (unsigned long)drvdata;
+	drvdata->rng.quality = CC_TRNG_QUALITY;
+
+	platform_set_drvdata(pdev, drvdata);
+	drvdata->pdev = pdev;
+
+	drvdata->circ.buf = (char *)drvdata->data_buf;
+
+	drvdata->cc_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(drvdata->cc_base)) {
+		dev_err(dev, "Failed to ioremap registers");
+		return PTR_ERR(drvdata->cc_base);
+	}
+
+	/* Then IRQ */
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	/* parse sampling rate from device tree */
+	rc = cc_trng_parse_sampling_ratio(drvdata);
+	if (rc) {
+		dev_err(dev, "Failed to get legal sampling ratio for rosc\n");
+		return rc;
+	}
+
+	rc = cc_trng_clk_init(drvdata);
+	if (rc) {
+		dev_err(dev, "cc_trng_clk_init failed\n");
+		return rc;
+	}
+
+	INIT_WORK(&drvdata->compwork, cc_trng_compwork_handler);
+	INIT_WORK(&drvdata->startwork, cc_trng_startwork_handler);
+	spin_lock_init(&drvdata->read_lock);
+
+	/* register the driver isr function */
+	rc = devm_request_irq(dev, irq, cc_isr, IRQF_SHARED, "cctrng", drvdata);
+	if (rc) {
+		dev_err(dev, "Could not register to interrupt %d\n", irq);
+		goto post_clk_err;
+	}
+	dev_dbg(dev, "Registered to IRQ: %d\n", irq);
+
+	/* Clear all pending interrupts */
+	val = cc_ioread(drvdata, CC_HOST_RGF_IRR_REG_OFFSET);
+	dev_dbg(dev, "IRR=0x%08X\n", val);
+	cc_iowrite(drvdata, CC_HOST_RGF_ICR_REG_OFFSET, val);
+
+	/* unmask HOST RNG interrupt */
+	cc_iowrite(drvdata, CC_HOST_RGF_IMR_REG_OFFSET,
+		   cc_ioread(drvdata, CC_HOST_RGF_IMR_REG_OFFSET) &
+		   ~CC_HOST_RNG_IRQ_MASK);
+
+	/* init PM */
+	rc = cc_trng_pm_init(drvdata);
+	if (rc) {
+		dev_err(dev, "cc_trng_pm_init failed\n");
+		goto post_clk_err;
+	}
+
+	/* increment device's usage counter */
+	rc = cc_trng_pm_get(dev);
+	if (rc) {
+		dev_err(dev, "cc_trng_pm_get returned %x\n", rc);
+		goto post_pm_err;
+	}
+
+	/* set pending_hw to verify that HW won't be triggered from read */
+	atomic_set(&drvdata->pending_hw, 1);
+
+	/* registration of the hwrng device */
+	rc = devm_hwrng_register(dev, &drvdata->rng);
+	if (rc) {
+		dev_err(dev, "Could not register hwrng device.\n");
+		goto post_pm_err;
+	}
+
+	/* trigger HW to start generate data */
+	drvdata->active_rosc = 0;
+	cc_trng_hw_trigger(drvdata);
+
+	/* All set, we can allow auto-suspend */
+	cc_trng_pm_go(drvdata);
+
+	dev_info(dev, "ARM cctrng device initialized\n");
+
+	return 0;
+
+post_pm_err:
+	cc_trng_pm_fini(drvdata);
+
+post_clk_err:
+	cc_trng_clk_fini(drvdata);
+
+	return rc;
+}
+
+static int cctrng_remove(struct platform_device *pdev)
+{
+	struct cctrng_drvdata *drvdata = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+
+	dev_dbg(dev, "Releasing cctrng resources...\n");
+
+	cc_trng_pm_fini(drvdata);
+
+	cc_trng_clk_fini(drvdata);
+
+	dev_info(dev, "ARM cctrng device terminated\n");
+
+	return 0;
+}
+
+static int __maybe_unused cctrng_suspend(struct device *dev)
+{
+	struct cctrng_drvdata *drvdata = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
+	cc_iowrite(drvdata, CC_HOST_POWER_DOWN_EN_REG_OFFSET,
+			POWER_DOWN_ENABLE);
+
+	clk_disable_unprepare(drvdata->clk);
+
+	return 0;
+}
+
+static bool cctrng_wait_for_reset_completion(struct cctrng_drvdata *drvdata)
+{
+	unsigned int val;
+	unsigned int i;
+
+	for (i = 0; i < CC_HW_RESET_LOOP_COUNT; i++) {
+		/* in cc7x3 NVM_IS_IDLE indicates that CC reset is
+		 *  completed and device is fully functional
+		 */
+		val = cc_ioread(drvdata, CC_NVM_IS_IDLE_REG_OFFSET);
+		if (val & BIT(CC_NVM_IS_IDLE_VALUE_BIT_SHIFT)) {
+			/* hw indicate reset completed */
+			return true;
+		}
+		/* allow scheduling other process on the processor */
+		schedule();
+	}
+	/* reset not completed */
+	return false;
+}
+
+static int __maybe_unused cctrng_resume(struct device *dev)
+{
+	struct cctrng_drvdata *drvdata = dev_get_drvdata(dev);
+	int rc;
+
+	dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
+	/* Enables the device source clk */
+	rc = clk_prepare_enable(drvdata->clk);
+	if (rc) {
+		dev_err(dev, "failed getting clock back on. We're toast.\n");
+		return rc;
+	}
+
+	/* wait for Cryptocell reset completion */
+	if (!cctrng_wait_for_reset_completion(drvdata)) {
+		dev_err(dev, "Cryptocell reset not completed");
+		return -EBUSY;
+	}
+
+	/* unmask HOST RNG interrupt */
+	cc_iowrite(drvdata, CC_HOST_RGF_IMR_REG_OFFSET,
+		   cc_ioread(drvdata, CC_HOST_RGF_IMR_REG_OFFSET) &
+		   ~CC_HOST_RNG_IRQ_MASK);
+
+	cc_iowrite(drvdata, CC_HOST_POWER_DOWN_EN_REG_OFFSET,
+		   POWER_DOWN_DISABLE);
+
+	return 0;
+}
+
+static UNIVERSAL_DEV_PM_OPS(cctrng_pm, cctrng_suspend, cctrng_resume, NULL);
+
+static const struct of_device_id arm_cctrng_dt_match[] = {
+	{ .compatible = "arm,cryptocell-713-trng", },
+	{ .compatible = "arm,cryptocell-703-trng", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, arm_cctrng_dt_match);
+
+static struct platform_driver cctrng_driver = {
+	.driver = {
+		.name = "cctrng",
+		.of_match_table = arm_cctrng_dt_match,
+		.pm = &cctrng_pm,
+	},
+	.probe = cctrng_probe,
+	.remove = cctrng_remove,
+};
+
+static int __init cctrng_mod_init(void)
+{
+	/* Compile time assertion checks */
+	BUILD_BUG_ON(CCTRNG_DATA_BUF_WORDS < 6);
+	BUILD_BUG_ON((CCTRNG_DATA_BUF_WORDS & (CCTRNG_DATA_BUF_WORDS-1)) != 0);
+
+	return platform_driver_register(&cctrng_driver);
+}
+module_init(cctrng_mod_init);
+
+static void __exit cctrng_mod_exit(void)
+{
+	platform_driver_unregister(&cctrng_driver);
+}
+module_exit(cctrng_mod_exit);
+
+/* Module description */
+MODULE_DESCRIPTION("ARM CryptoCell TRNG Driver");
+MODULE_AUTHOR("ARM");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/cctrng.h b/drivers/char/hw_random/cctrng.h
new file mode 100644
index 000000000..1f2fde95a
--- /dev/null
+++ b/drivers/char/hw_random/cctrng.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2019-2020 ARM Limited or its affiliates. */
+
+#include <linux/bitops.h>
+
+#define POWER_DOWN_ENABLE 0x01
+#define POWER_DOWN_DISABLE 0x00
+
+/* hwrng quality: bits of true entropy per 1024 bits of input */
+#define CC_TRNG_QUALITY	1024
+
+/* CryptoCell TRNG HW definitions */
+#define CC_TRNG_NUM_OF_ROSCS	4
+/* The number of words generated in the entropy holding register (EHR)
+ * 6 words (192 bit) according to HW implementation
+ */
+#define CC_TRNG_EHR_IN_WORDS	6
+#define CC_TRNG_EHR_IN_BITS	(CC_TRNG_EHR_IN_WORDS * BITS_PER_TYPE(u32))
+
+#define CC_HOST_RNG_IRQ_MASK BIT(CC_HOST_RGF_IRR_RNG_INT_BIT_SHIFT)
+
+/* RNG interrupt mask */
+#define CC_RNG_INT_MASK (BIT(CC_RNG_IMR_EHR_VALID_INT_MASK_BIT_SHIFT) | \
+			 BIT(CC_RNG_IMR_AUTOCORR_ERR_INT_MASK_BIT_SHIFT) | \
+			 BIT(CC_RNG_IMR_CRNGT_ERR_INT_MASK_BIT_SHIFT) | \
+			 BIT(CC_RNG_IMR_VN_ERR_INT_MASK_BIT_SHIFT) | \
+			 BIT(CC_RNG_IMR_WATCHDOG_INT_MASK_BIT_SHIFT))
+
+// --------------------------------------
+// BLOCK: RNG
+// --------------------------------------
+#define CC_RNG_IMR_REG_OFFSET	0x0100UL
+#define CC_RNG_IMR_EHR_VALID_INT_MASK_BIT_SHIFT	0x0UL
+#define CC_RNG_IMR_AUTOCORR_ERR_INT_MASK_BIT_SHIFT	0x1UL
+#define CC_RNG_IMR_CRNGT_ERR_INT_MASK_BIT_SHIFT	0x2UL
+#define CC_RNG_IMR_VN_ERR_INT_MASK_BIT_SHIFT	0x3UL
+#define CC_RNG_IMR_WATCHDOG_INT_MASK_BIT_SHIFT	0x4UL
+#define CC_RNG_ISR_REG_OFFSET	0x0104UL
+#define CC_RNG_ISR_EHR_VALID_BIT_SHIFT	0x0UL
+#define CC_RNG_ISR_EHR_VALID_BIT_SIZE	0x1UL
+#define CC_RNG_ISR_AUTOCORR_ERR_BIT_SHIFT	0x1UL
+#define CC_RNG_ISR_AUTOCORR_ERR_BIT_SIZE	0x1UL
+#define CC_RNG_ISR_CRNGT_ERR_BIT_SHIFT	0x2UL
+#define CC_RNG_ISR_CRNGT_ERR_BIT_SIZE	0x1UL
+#define CC_RNG_ISR_WATCHDOG_BIT_SHIFT	0x4UL
+#define CC_RNG_ISR_WATCHDOG_BIT_SIZE	0x1UL
+#define CC_RNG_ICR_REG_OFFSET	0x0108UL
+#define CC_TRNG_CONFIG_REG_OFFSET	0x010CUL
+#define CC_EHR_DATA_0_REG_OFFSET	0x0114UL
+#define CC_RND_SOURCE_ENABLE_REG_OFFSET	0x012CUL
+#define CC_SAMPLE_CNT1_REG_OFFSET	0x0130UL
+#define CC_TRNG_DEBUG_CONTROL_REG_OFFSET	0x0138UL
+#define CC_RNG_SW_RESET_REG_OFFSET	0x0140UL
+#define CC_RNG_CLK_ENABLE_REG_OFFSET	0x01C4UL
+#define CC_RNG_DMA_ENABLE_REG_OFFSET	0x01C8UL
+#define CC_RNG_WATCHDOG_VAL_REG_OFFSET	0x01D8UL
+// --------------------------------------
+// BLOCK: SEC_HOST_RGF
+// --------------------------------------
+#define CC_HOST_RGF_IRR_REG_OFFSET	0x0A00UL
+#define CC_HOST_RGF_IRR_RNG_INT_BIT_SHIFT	0xAUL
+#define CC_HOST_RGF_IMR_REG_OFFSET	0x0A04UL
+#define CC_HOST_RGF_ICR_REG_OFFSET	0x0A08UL
+
+#define CC_HOST_POWER_DOWN_EN_REG_OFFSET	0x0A78UL
+
+// --------------------------------------
+// BLOCK: NVM
+// --------------------------------------
+#define CC_NVM_IS_IDLE_REG_OFFSET	0x0F10UL
+#define CC_NVM_IS_IDLE_VALUE_BIT_SHIFT	0x0UL
+#define CC_NVM_IS_IDLE_VALUE_BIT_SIZE	0x1UL
diff --git a/drivers/char/hw_random/cn10k-rng.c b/drivers/char/hw_random/cn10k-rng.c
new file mode 100644
index 000000000..a01e93077
--- /dev/null
+++ b/drivers/char/hw_random/cn10k-rng.c
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell CN10K RVU Hardware Random Number Generator.
+ *
+ * Copyright (C) 2021 Marvell.
+ *
+ */
+
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/delay.h>
+
+#include <linux/arm-smccc.h>
+
+/* CSRs */
+#define RNM_CTL_STATUS		0x000
+#define RNM_ENTROPY_STATUS	0x008
+#define RNM_CONST		0x030
+#define RNM_EBG_ENT		0x048
+#define RNM_PF_EBG_HEALTH	0x050
+#define RNM_PF_RANDOM		0x400
+#define RNM_TRNG_RESULT		0x408
+
+struct cn10k_rng {
+	void __iomem *reg_base;
+	struct hwrng ops;
+	struct pci_dev *pdev;
+};
+
+#define PLAT_OCTEONTX_RESET_RNG_EBG_HEALTH_STATE     0xc2000b0f
+
+static unsigned long reset_rng_health_state(struct cn10k_rng *rng)
+{
+	struct arm_smccc_res res;
+
+	/* Send SMC service call to reset EBG health state */
+	arm_smccc_smc(PLAT_OCTEONTX_RESET_RNG_EBG_HEALTH_STATE, 0, 0, 0, 0, 0, 0, 0, &res);
+	return res.a0;
+}
+
+static int check_rng_health(struct cn10k_rng *rng)
+{
+	u64 status;
+	unsigned long err;
+
+	/* Skip checking health */
+	if (!rng->reg_base)
+		return -ENODEV;
+
+	status = readq(rng->reg_base + RNM_PF_EBG_HEALTH);
+	if (status & BIT_ULL(20)) {
+		err = reset_rng_health_state(rng);
+		if (err) {
+			dev_err(&rng->pdev->dev, "HWRNG: Health test failed (status=%llx)\n",
+					status);
+			dev_err(&rng->pdev->dev, "HWRNG: error during reset (error=%lx)\n",
+					err);
+			return -EIO;
+		}
+	}
+	return 0;
+}
+
+static void cn10k_read_trng(struct cn10k_rng *rng, u64 *value)
+{
+	u64 upper, lower;
+
+	*value = readq(rng->reg_base + RNM_PF_RANDOM);
+
+	/* HW can run out of entropy if large amount random data is read in
+	 * quick succession. Zeros may not be real random data from HW.
+	 */
+	if (!*value) {
+		upper = readq(rng->reg_base + RNM_PF_RANDOM);
+		lower = readq(rng->reg_base + RNM_PF_RANDOM);
+		while (!(upper & 0x00000000FFFFFFFFULL))
+			upper = readq(rng->reg_base + RNM_PF_RANDOM);
+		while (!(lower & 0xFFFFFFFF00000000ULL))
+			lower = readq(rng->reg_base + RNM_PF_RANDOM);
+
+		*value = (upper & 0xFFFFFFFF00000000) | (lower & 0xFFFFFFFF);
+	}
+}
+
+static int cn10k_rng_read(struct hwrng *hwrng, void *data,
+			  size_t max, bool wait)
+{
+	struct cn10k_rng *rng = (struct cn10k_rng *)hwrng->priv;
+	unsigned int size;
+	u8 *pos = data;
+	int err = 0;
+	u64 value;
+
+	err = check_rng_health(rng);
+	if (err)
+		return err;
+
+	size = max;
+
+	while (size >= 8) {
+		cn10k_read_trng(rng, &value);
+
+		*((u64 *)pos) = value;
+		size -= 8;
+		pos += 8;
+	}
+
+	if (size > 0) {
+		cn10k_read_trng(rng, &value);
+
+		while (size > 0) {
+			*pos = (u8)value;
+			value >>= 8;
+			size--;
+			pos++;
+		}
+	}
+
+	return max - size;
+}
+
+static int cn10k_rng_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct	cn10k_rng *rng;
+	int	err;
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	rng->pdev = pdev;
+	pci_set_drvdata(pdev, rng);
+
+	rng->reg_base = pcim_iomap(pdev, 0, 0);
+	if (!rng->reg_base) {
+		dev_err(&pdev->dev, "Error while mapping CSRs, exiting\n");
+		return -ENOMEM;
+	}
+
+	rng->ops.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+				       "cn10k-rng-%s", dev_name(&pdev->dev));
+	if (!rng->ops.name)
+		return -ENOMEM;
+
+	rng->ops.read    = cn10k_rng_read;
+	rng->ops.quality = 1000;
+	rng->ops.priv = (unsigned long)rng;
+
+	reset_rng_health_state(rng);
+
+	err = devm_hwrng_register(&pdev->dev, &rng->ops);
+	if (err) {
+		dev_err(&pdev->dev, "Could not register hwrng device.\n");
+		return err;
+	}
+
+	return 0;
+}
+
+static void cn10k_rng_remove(struct pci_dev *pdev)
+{
+	/* Nothing to do */
+}
+
+static const struct pci_device_id cn10k_rng_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xA098) }, /* RNG PF */
+	{0,},
+};
+
+MODULE_DEVICE_TABLE(pci, cn10k_rng_id_table);
+
+static struct pci_driver cn10k_rng_driver = {
+	.name		= "cn10k_rng",
+	.id_table	= cn10k_rng_id_table,
+	.probe		= cn10k_rng_probe,
+	.remove		= cn10k_rng_remove,
+};
+
+module_pci_driver(cn10k_rng_driver);
+MODULE_AUTHOR("Sunil Goutham <sgoutham@marvell.com>");
+MODULE_DESCRIPTION("Marvell CN10K HW RNG Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
new file mode 100644
index 000000000..c319f9937
--- /dev/null
+++ b/drivers/char/hw_random/core.c
@@ -0,0 +1,736 @@
+/*
+ * hw_random/core.c: HWRNG core API
+ *
+ * Copyright 2006 Michael Buesch <m@bues.ch>
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * Please read Documentation/admin-guide/hw_random.rst for details on use.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/hw_random.h>
+#include <linux/random.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/sched/signal.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+
+#define RNG_MODULE_NAME		"hw_random"
+
+#define RNG_BUFFER_SIZE (SMP_CACHE_BYTES < 32 ? 32 : SMP_CACHE_BYTES)
+
+static struct hwrng *current_rng;
+/* the current rng has been explicitly chosen by user via sysfs */
+static int cur_rng_set_by_user;
+static struct task_struct *hwrng_fill;
+/* list of registered rngs */
+static LIST_HEAD(rng_list);
+/* Protects rng_list and current_rng */
+static DEFINE_MUTEX(rng_mutex);
+/* Protects rng read functions, data_avail, rng_buffer and rng_fillbuf */
+static DEFINE_MUTEX(reading_mutex);
+static int data_avail;
+static u8 *rng_buffer, *rng_fillbuf;
+static unsigned short current_quality;
+static unsigned short default_quality; /* = 0; default to "off" */
+
+module_param(current_quality, ushort, 0644);
+MODULE_PARM_DESC(current_quality,
+		 "current hwrng entropy estimation per 1024 bits of input -- obsolete, use rng_quality instead");
+module_param(default_quality, ushort, 0644);
+MODULE_PARM_DESC(default_quality,
+		 "default entropy content of hwrng per 1024 bits of input");
+
+static void drop_current_rng(void);
+static int hwrng_init(struct hwrng *rng);
+static int hwrng_fillfn(void *unused);
+
+static inline int rng_get_data(struct hwrng *rng, u8 *buffer, size_t size,
+			       int wait);
+
+static size_t rng_buffer_size(void)
+{
+	return RNG_BUFFER_SIZE;
+}
+
+static void add_early_randomness(struct hwrng *rng)
+{
+	int bytes_read;
+
+	mutex_lock(&reading_mutex);
+	bytes_read = rng_get_data(rng, rng_fillbuf, 32, 0);
+	mutex_unlock(&reading_mutex);
+	if (bytes_read > 0)
+		add_device_randomness(rng_fillbuf, bytes_read);
+}
+
+static inline void cleanup_rng(struct kref *kref)
+{
+	struct hwrng *rng = container_of(kref, struct hwrng, ref);
+
+	if (rng->cleanup)
+		rng->cleanup(rng);
+
+	complete(&rng->cleanup_done);
+}
+
+static int set_current_rng(struct hwrng *rng)
+{
+	int err;
+
+	BUG_ON(!mutex_is_locked(&rng_mutex));
+
+	err = hwrng_init(rng);
+	if (err)
+		return err;
+
+	drop_current_rng();
+	current_rng = rng;
+
+	/* if necessary, start hwrng thread */
+	if (!hwrng_fill) {
+		hwrng_fill = kthread_run(hwrng_fillfn, NULL, "hwrng");
+		if (IS_ERR(hwrng_fill)) {
+			pr_err("hwrng_fill thread creation failed\n");
+			hwrng_fill = NULL;
+		}
+	}
+
+	return 0;
+}
+
+static void drop_current_rng(void)
+{
+	BUG_ON(!mutex_is_locked(&rng_mutex));
+	if (!current_rng)
+		return;
+
+	/* decrease last reference for triggering the cleanup */
+	kref_put(&current_rng->ref, cleanup_rng);
+	current_rng = NULL;
+}
+
+/* Returns ERR_PTR(), NULL or refcounted hwrng */
+static struct hwrng *get_current_rng_nolock(void)
+{
+	if (current_rng)
+		kref_get(&current_rng->ref);
+
+	return current_rng;
+}
+
+static struct hwrng *get_current_rng(void)
+{
+	struct hwrng *rng;
+
+	if (mutex_lock_interruptible(&rng_mutex))
+		return ERR_PTR(-ERESTARTSYS);
+
+	rng = get_current_rng_nolock();
+
+	mutex_unlock(&rng_mutex);
+	return rng;
+}
+
+static void put_rng(struct hwrng *rng)
+{
+	/*
+	 * Hold rng_mutex here so we serialize in case they set_current_rng
+	 * on rng again immediately.
+	 */
+	mutex_lock(&rng_mutex);
+	if (rng)
+		kref_put(&rng->ref, cleanup_rng);
+	mutex_unlock(&rng_mutex);
+}
+
+static int hwrng_init(struct hwrng *rng)
+{
+	if (kref_get_unless_zero(&rng->ref))
+		goto skip_init;
+
+	if (rng->init) {
+		int ret;
+
+		ret =  rng->init(rng);
+		if (ret)
+			return ret;
+	}
+
+	kref_init(&rng->ref);
+	reinit_completion(&rng->cleanup_done);
+
+skip_init:
+	if (!rng->quality)
+		rng->quality = default_quality;
+	if (rng->quality > 1024)
+		rng->quality = 1024;
+	current_quality = rng->quality; /* obsolete */
+
+	return 0;
+}
+
+static int rng_dev_open(struct inode *inode, struct file *filp)
+{
+	/* enforce read-only access to this chrdev */
+	if ((filp->f_mode & FMODE_READ) == 0)
+		return -EINVAL;
+	if (filp->f_mode & FMODE_WRITE)
+		return -EINVAL;
+	return 0;
+}
+
+static inline int rng_get_data(struct hwrng *rng, u8 *buffer, size_t size,
+			int wait) {
+	int present;
+
+	BUG_ON(!mutex_is_locked(&reading_mutex));
+	if (rng->read)
+		return rng->read(rng, (void *)buffer, size, wait);
+
+	if (rng->data_present)
+		present = rng->data_present(rng, wait);
+	else
+		present = 1;
+
+	if (present)
+		return rng->data_read(rng, (u32 *)buffer);
+
+	return 0;
+}
+
+static ssize_t rng_dev_read(struct file *filp, char __user *buf,
+			    size_t size, loff_t *offp)
+{
+	u8 buffer[RNG_BUFFER_SIZE];
+	ssize_t ret = 0;
+	int err = 0;
+	int bytes_read, len;
+	struct hwrng *rng;
+
+	while (size) {
+		rng = get_current_rng();
+		if (IS_ERR(rng)) {
+			err = PTR_ERR(rng);
+			goto out;
+		}
+		if (!rng) {
+			err = -ENODEV;
+			goto out;
+		}
+
+		if (mutex_lock_interruptible(&reading_mutex)) {
+			err = -ERESTARTSYS;
+			goto out_put;
+		}
+		if (!data_avail) {
+			bytes_read = rng_get_data(rng, rng_buffer,
+				rng_buffer_size(),
+				!(filp->f_flags & O_NONBLOCK));
+			if (bytes_read < 0) {
+				err = bytes_read;
+				goto out_unlock_reading;
+			} else if (bytes_read == 0 &&
+				   (filp->f_flags & O_NONBLOCK)) {
+				err = -EAGAIN;
+				goto out_unlock_reading;
+			}
+
+			data_avail = bytes_read;
+		}
+
+		len = data_avail;
+		if (len) {
+			if (len > size)
+				len = size;
+
+			data_avail -= len;
+
+			memcpy(buffer, rng_buffer + data_avail, len);
+		}
+		mutex_unlock(&reading_mutex);
+		put_rng(rng);
+
+		if (len) {
+			if (copy_to_user(buf + ret, buffer, len)) {
+				err = -EFAULT;
+				goto out;
+			}
+
+			size -= len;
+			ret += len;
+		}
+
+
+		if (need_resched())
+			schedule_timeout_interruptible(1);
+
+		if (signal_pending(current)) {
+			err = -ERESTARTSYS;
+			goto out;
+		}
+	}
+out:
+	memzero_explicit(buffer, sizeof(buffer));
+	return ret ? : err;
+
+out_unlock_reading:
+	mutex_unlock(&reading_mutex);
+out_put:
+	put_rng(rng);
+	goto out;
+}
+
+static const struct file_operations rng_chrdev_ops = {
+	.owner		= THIS_MODULE,
+	.open		= rng_dev_open,
+	.read		= rng_dev_read,
+	.llseek		= noop_llseek,
+};
+
+static const struct attribute_group *rng_dev_groups[];
+
+static struct miscdevice rng_miscdev = {
+	.minor		= HWRNG_MINOR,
+	.name		= RNG_MODULE_NAME,
+	.nodename	= "hwrng",
+	.fops		= &rng_chrdev_ops,
+	.groups		= rng_dev_groups,
+};
+
+static int enable_best_rng(void)
+{
+	struct hwrng *rng, *new_rng = NULL;
+	int ret = -ENODEV;
+
+	BUG_ON(!mutex_is_locked(&rng_mutex));
+
+	/* no rng to use? */
+	if (list_empty(&rng_list)) {
+		drop_current_rng();
+		cur_rng_set_by_user = 0;
+		return 0;
+	}
+
+	/* use the rng which offers the best quality */
+	list_for_each_entry(rng, &rng_list, list) {
+		if (!new_rng || rng->quality > new_rng->quality)
+			new_rng = rng;
+	}
+
+	ret = ((new_rng == current_rng) ? 0 : set_current_rng(new_rng));
+	if (!ret)
+		cur_rng_set_by_user = 0;
+
+	return ret;
+}
+
+static ssize_t rng_current_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len)
+{
+	int err;
+	struct hwrng *rng, *old_rng, *new_rng;
+
+	err = mutex_lock_interruptible(&rng_mutex);
+	if (err)
+		return -ERESTARTSYS;
+
+	old_rng = current_rng;
+	if (sysfs_streq(buf, "")) {
+		err = enable_best_rng();
+	} else {
+		list_for_each_entry(rng, &rng_list, list) {
+			if (sysfs_streq(rng->name, buf)) {
+				err = set_current_rng(rng);
+				if (!err)
+					cur_rng_set_by_user = 1;
+				break;
+			}
+		}
+	}
+	new_rng = get_current_rng_nolock();
+	mutex_unlock(&rng_mutex);
+
+	if (new_rng) {
+		if (new_rng != old_rng)
+			add_early_randomness(new_rng);
+		put_rng(new_rng);
+	}
+
+	return err ? : len;
+}
+
+static ssize_t rng_current_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	ssize_t ret;
+	struct hwrng *rng;
+
+	rng = get_current_rng();
+	if (IS_ERR(rng))
+		return PTR_ERR(rng);
+
+	ret = snprintf(buf, PAGE_SIZE, "%s\n", rng ? rng->name : "none");
+	put_rng(rng);
+
+	return ret;
+}
+
+static ssize_t rng_available_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	int err;
+	struct hwrng *rng;
+
+	err = mutex_lock_interruptible(&rng_mutex);
+	if (err)
+		return -ERESTARTSYS;
+	buf[0] = '\0';
+	list_for_each_entry(rng, &rng_list, list) {
+		strlcat(buf, rng->name, PAGE_SIZE);
+		strlcat(buf, " ", PAGE_SIZE);
+	}
+	strlcat(buf, "\n", PAGE_SIZE);
+	mutex_unlock(&rng_mutex);
+
+	return strlen(buf);
+}
+
+static ssize_t rng_selected_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	return sysfs_emit(buf, "%d\n", cur_rng_set_by_user);
+}
+
+static ssize_t rng_quality_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	ssize_t ret;
+	struct hwrng *rng;
+
+	rng = get_current_rng();
+	if (IS_ERR(rng))
+		return PTR_ERR(rng);
+
+	if (!rng) /* no need to put_rng */
+		return -ENODEV;
+
+	ret = sysfs_emit(buf, "%hu\n", rng->quality);
+	put_rng(rng);
+
+	return ret;
+}
+
+static ssize_t rng_quality_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len)
+{
+	u16 quality;
+	int ret = -EINVAL;
+
+	if (len < 2)
+		return -EINVAL;
+
+	ret = mutex_lock_interruptible(&rng_mutex);
+	if (ret)
+		return -ERESTARTSYS;
+
+	ret = kstrtou16(buf, 0, &quality);
+	if (ret || quality > 1024) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (!current_rng) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	current_rng->quality = quality;
+	current_quality = quality; /* obsolete */
+
+	/* the best available RNG may have changed */
+	ret = enable_best_rng();
+
+out:
+	mutex_unlock(&rng_mutex);
+	return ret ? ret : len;
+}
+
+static DEVICE_ATTR_RW(rng_current);
+static DEVICE_ATTR_RO(rng_available);
+static DEVICE_ATTR_RO(rng_selected);
+static DEVICE_ATTR_RW(rng_quality);
+
+static struct attribute *rng_dev_attrs[] = {
+	&dev_attr_rng_current.attr,
+	&dev_attr_rng_available.attr,
+	&dev_attr_rng_selected.attr,
+	&dev_attr_rng_quality.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(rng_dev);
+
+static void __exit unregister_miscdev(void)
+{
+	misc_deregister(&rng_miscdev);
+}
+
+static int __init register_miscdev(void)
+{
+	return misc_register(&rng_miscdev);
+}
+
+static int hwrng_fillfn(void *unused)
+{
+	size_t entropy, entropy_credit = 0; /* in 1/1024 of a bit */
+	long rc;
+
+	while (!kthread_should_stop()) {
+		unsigned short quality;
+		struct hwrng *rng;
+
+		rng = get_current_rng();
+		if (IS_ERR(rng) || !rng)
+			break;
+		mutex_lock(&reading_mutex);
+		rc = rng_get_data(rng, rng_fillbuf,
+				  rng_buffer_size(), 1);
+		if (current_quality != rng->quality)
+			rng->quality = current_quality; /* obsolete */
+		quality = rng->quality;
+		mutex_unlock(&reading_mutex);
+
+		if (rc <= 0)
+			hwrng_msleep(rng, 10000);
+
+		put_rng(rng);
+
+		if (rc <= 0)
+			continue;
+
+		/* If we cannot credit at least one bit of entropy,
+		 * keep track of the remainder for the next iteration
+		 */
+		entropy = rc * quality * 8 + entropy_credit;
+		if ((entropy >> 10) == 0)
+			entropy_credit = entropy;
+
+		/* Outside lock, sure, but y'know: randomness. */
+		add_hwgenerator_randomness((void *)rng_fillbuf, rc,
+					   entropy >> 10);
+	}
+	hwrng_fill = NULL;
+	return 0;
+}
+
+int hwrng_register(struct hwrng *rng)
+{
+	int err = -EINVAL;
+	struct hwrng *tmp;
+	bool is_new_current = false;
+
+	if (!rng->name || (!rng->data_read && !rng->read))
+		goto out;
+
+	mutex_lock(&rng_mutex);
+
+	/* Must not register two RNGs with the same name. */
+	err = -EEXIST;
+	list_for_each_entry(tmp, &rng_list, list) {
+		if (strcmp(tmp->name, rng->name) == 0)
+			goto out_unlock;
+	}
+	list_add_tail(&rng->list, &rng_list);
+
+	init_completion(&rng->cleanup_done);
+	complete(&rng->cleanup_done);
+	init_completion(&rng->dying);
+
+	if (!current_rng ||
+	    (!cur_rng_set_by_user && rng->quality > current_rng->quality)) {
+		/*
+		 * Set new rng as current as the new rng source
+		 * provides better entropy quality and was not
+		 * chosen by userspace.
+		 */
+		err = set_current_rng(rng);
+		if (err)
+			goto out_unlock;
+		/* to use current_rng in add_early_randomness() we need
+		 * to take a ref
+		 */
+		is_new_current = true;
+		kref_get(&rng->ref);
+	}
+	mutex_unlock(&rng_mutex);
+	if (is_new_current || !rng->init) {
+		/*
+		 * Use a new device's input to add some randomness to
+		 * the system.  If this rng device isn't going to be
+		 * used right away, its init function hasn't been
+		 * called yet by set_current_rng(); so only use the
+		 * randomness from devices that don't need an init callback
+		 */
+		add_early_randomness(rng);
+	}
+	if (is_new_current)
+		put_rng(rng);
+	return 0;
+out_unlock:
+	mutex_unlock(&rng_mutex);
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(hwrng_register);
+
+void hwrng_unregister(struct hwrng *rng)
+{
+	struct hwrng *old_rng, *new_rng;
+	int err;
+
+	mutex_lock(&rng_mutex);
+
+	old_rng = current_rng;
+	list_del(&rng->list);
+	complete_all(&rng->dying);
+	if (current_rng == rng) {
+		err = enable_best_rng();
+		if (err) {
+			drop_current_rng();
+			cur_rng_set_by_user = 0;
+		}
+	}
+
+	new_rng = get_current_rng_nolock();
+	if (list_empty(&rng_list)) {
+		mutex_unlock(&rng_mutex);
+		if (hwrng_fill)
+			kthread_stop(hwrng_fill);
+	} else
+		mutex_unlock(&rng_mutex);
+
+	if (new_rng) {
+		if (old_rng != new_rng)
+			add_early_randomness(new_rng);
+		put_rng(new_rng);
+	}
+
+	wait_for_completion(&rng->cleanup_done);
+}
+EXPORT_SYMBOL_GPL(hwrng_unregister);
+
+static void devm_hwrng_release(struct device *dev, void *res)
+{
+	hwrng_unregister(*(struct hwrng **)res);
+}
+
+static int devm_hwrng_match(struct device *dev, void *res, void *data)
+{
+	struct hwrng **r = res;
+
+	if (WARN_ON(!r || !*r))
+		return 0;
+
+	return *r == data;
+}
+
+int devm_hwrng_register(struct device *dev, struct hwrng *rng)
+{
+	struct hwrng **ptr;
+	int error;
+
+	ptr = devres_alloc(devm_hwrng_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	error = hwrng_register(rng);
+	if (error) {
+		devres_free(ptr);
+		return error;
+	}
+
+	*ptr = rng;
+	devres_add(dev, ptr);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_hwrng_register);
+
+void devm_hwrng_unregister(struct device *dev, struct hwrng *rng)
+{
+	devres_release(dev, devm_hwrng_release, devm_hwrng_match, rng);
+}
+EXPORT_SYMBOL_GPL(devm_hwrng_unregister);
+
+long hwrng_msleep(struct hwrng *rng, unsigned int msecs)
+{
+	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
+
+	return wait_for_completion_interruptible_timeout(&rng->dying, timeout);
+}
+EXPORT_SYMBOL_GPL(hwrng_msleep);
+
+long hwrng_yield(struct hwrng *rng)
+{
+	return wait_for_completion_interruptible_timeout(&rng->dying, 1);
+}
+EXPORT_SYMBOL_GPL(hwrng_yield);
+
+static int __init hwrng_modinit(void)
+{
+	int ret;
+
+	/* kmalloc makes this safe for virt_to_page() in virtio_rng.c */
+	rng_buffer = kmalloc(rng_buffer_size(), GFP_KERNEL);
+	if (!rng_buffer)
+		return -ENOMEM;
+
+	rng_fillbuf = kmalloc(rng_buffer_size(), GFP_KERNEL);
+	if (!rng_fillbuf) {
+		kfree(rng_buffer);
+		return -ENOMEM;
+	}
+
+	ret = register_miscdev();
+	if (ret) {
+		kfree(rng_fillbuf);
+		kfree(rng_buffer);
+	}
+
+	return ret;
+}
+
+static void __exit hwrng_modexit(void)
+{
+	mutex_lock(&rng_mutex);
+	BUG_ON(current_rng);
+	kfree(rng_buffer);
+	kfree(rng_fillbuf);
+	mutex_unlock(&rng_mutex);
+
+	unregister_miscdev();
+}
+
+fs_initcall(hwrng_modinit); /* depends on misc_register() */
+module_exit(hwrng_modexit);
+
+MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c
new file mode 100644
index 000000000..9cc3d542d
--- /dev/null
+++ b/drivers/char/hw_random/exynos-trng.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RNG driver for Exynos TRNGs
+ *
+ * Author: Łukasz Stelmach <l.stelmach@samsung.com>
+ *
+ * Copyright 2017 (c) Samsung Electronics Software, Inc.
+ *
+ * Based on the Exynos PRNG driver drivers/crypto/exynos-rng by
+ * Krzysztof Kozłowski <krzk@kernel.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#define EXYNOS_TRNG_CLKDIV         (0x0)
+
+#define EXYNOS_TRNG_CTRL           (0x20)
+#define EXYNOS_TRNG_CTRL_RNGEN     BIT(31)
+
+#define EXYNOS_TRNG_POST_CTRL      (0x30)
+#define EXYNOS_TRNG_ONLINE_CTRL    (0x40)
+#define EXYNOS_TRNG_ONLINE_STAT    (0x44)
+#define EXYNOS_TRNG_ONLINE_MAXCHI2 (0x48)
+#define EXYNOS_TRNG_FIFO_CTRL      (0x50)
+#define EXYNOS_TRNG_FIFO_0         (0x80)
+#define EXYNOS_TRNG_FIFO_1         (0x84)
+#define EXYNOS_TRNG_FIFO_2         (0x88)
+#define EXYNOS_TRNG_FIFO_3         (0x8c)
+#define EXYNOS_TRNG_FIFO_4         (0x90)
+#define EXYNOS_TRNG_FIFO_5         (0x94)
+#define EXYNOS_TRNG_FIFO_6         (0x98)
+#define EXYNOS_TRNG_FIFO_7         (0x9c)
+#define EXYNOS_TRNG_FIFO_LEN       (8)
+#define EXYNOS_TRNG_CLOCK_RATE     (500000)
+
+
+struct exynos_trng_dev {
+	struct device    *dev;
+	void __iomem     *mem;
+	struct clk       *clk;
+	struct hwrng rng;
+};
+
+static int exynos_trng_do_read(struct hwrng *rng, void *data, size_t max,
+			       bool wait)
+{
+	struct exynos_trng_dev *trng;
+	int val;
+
+	max = min_t(size_t, max, (EXYNOS_TRNG_FIFO_LEN * 4));
+
+	trng = (struct exynos_trng_dev *)rng->priv;
+
+	writel_relaxed(max * 8, trng->mem + EXYNOS_TRNG_FIFO_CTRL);
+	val = readl_poll_timeout(trng->mem + EXYNOS_TRNG_FIFO_CTRL, val,
+				 val == 0, 200, 1000000);
+	if (val < 0)
+		return val;
+
+	memcpy_fromio(data, trng->mem + EXYNOS_TRNG_FIFO_0, max);
+
+	return max;
+}
+
+static int exynos_trng_init(struct hwrng *rng)
+{
+	struct exynos_trng_dev *trng = (struct exynos_trng_dev *)rng->priv;
+	unsigned long sss_rate;
+	u32 val;
+
+	sss_rate = clk_get_rate(trng->clk);
+
+	/*
+	 * For most TRNG circuits the clock frequency of under 500 kHz
+	 * is safe.
+	 */
+	val = sss_rate / (EXYNOS_TRNG_CLOCK_RATE * 2);
+	if (val > 0x7fff) {
+		dev_err(trng->dev, "clock divider too large: %d", val);
+		return -ERANGE;
+	}
+	val = val << 1;
+	writel_relaxed(val, trng->mem + EXYNOS_TRNG_CLKDIV);
+
+	/* Enable the generator. */
+	val = EXYNOS_TRNG_CTRL_RNGEN;
+	writel_relaxed(val, trng->mem + EXYNOS_TRNG_CTRL);
+
+	/*
+	 * Disable post-processing. /dev/hwrng is supposed to deliver
+	 * unprocessed data.
+	 */
+	writel_relaxed(0, trng->mem + EXYNOS_TRNG_POST_CTRL);
+
+	return 0;
+}
+
+static int exynos_trng_probe(struct platform_device *pdev)
+{
+	struct exynos_trng_dev *trng;
+	int ret = -ENOMEM;
+
+	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+	if (!trng)
+		return ret;
+
+	trng->rng.name = devm_kstrdup(&pdev->dev, dev_name(&pdev->dev),
+				      GFP_KERNEL);
+	if (!trng->rng.name)
+		return ret;
+
+	trng->rng.init = exynos_trng_init;
+	trng->rng.read = exynos_trng_do_read;
+	trng->rng.priv = (unsigned long) trng;
+
+	platform_set_drvdata(pdev, trng);
+	trng->dev = &pdev->dev;
+
+	trng->mem = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(trng->mem))
+		return PTR_ERR(trng->mem);
+
+	pm_runtime_enable(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Could not get runtime PM.\n");
+		goto err_pm_get;
+	}
+
+	trng->clk = devm_clk_get(&pdev->dev, "secss");
+	if (IS_ERR(trng->clk)) {
+		ret = PTR_ERR(trng->clk);
+		dev_err(&pdev->dev, "Could not get clock.\n");
+		goto err_clock;
+	}
+
+	ret = clk_prepare_enable(trng->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Could not enable the clk.\n");
+		goto err_clock;
+	}
+
+	ret = devm_hwrng_register(&pdev->dev, &trng->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "Could not register hwrng device.\n");
+		goto err_register;
+	}
+
+	dev_info(&pdev->dev, "Exynos True Random Number Generator.\n");
+
+	return 0;
+
+err_register:
+	clk_disable_unprepare(trng->clk);
+
+err_clock:
+	pm_runtime_put_noidle(&pdev->dev);
+
+err_pm_get:
+	pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static int exynos_trng_remove(struct platform_device *pdev)
+{
+	struct exynos_trng_dev *trng =  platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(trng->clk);
+
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static int __maybe_unused exynos_trng_suspend(struct device *dev)
+{
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int __maybe_unused exynos_trng_resume(struct device *dev)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Could not get runtime PM.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(exynos_trng_pm_ops, exynos_trng_suspend,
+			 exynos_trng_resume);
+
+static const struct of_device_id exynos_trng_dt_match[] = {
+	{
+		.compatible = "samsung,exynos5250-trng",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, exynos_trng_dt_match);
+
+static struct platform_driver exynos_trng_driver = {
+	.driver = {
+		.name = "exynos-trng",
+		.pm = &exynos_trng_pm_ops,
+		.of_match_table = exynos_trng_dt_match,
+	},
+	.probe = exynos_trng_probe,
+	.remove = exynos_trng_remove,
+};
+
+module_platform_driver(exynos_trng_driver);
+MODULE_AUTHOR("Łukasz Stelmach");
+MODULE_DESCRIPTION("H/W TRNG driver for Exynos chips");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/geode-rng.c b/drivers/char/hw_random/geode-rng.c
new file mode 100644
index 000000000..159baf00a
--- /dev/null
+++ b/drivers/char/hw_random/geode-rng.c
@@ -0,0 +1,161 @@
+/*
+ * RNG driver for AMD Geode RNGs
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * with the majority of the code coming from:
+ *
+ * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
+ * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
+ *
+ * derived from
+ *
+ * Hardware driver for the AMD 768 Random Number Generator (RNG)
+ * (c) Copyright 2001 Red Hat Inc
+ *
+ * derived from
+ *
+ * Hardware driver for Intel i810 Random Number Generator (RNG)
+ * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+
+#define PFX	KBUILD_MODNAME ": "
+
+#define GEODE_RNG_DATA_REG   0x50
+#define GEODE_RNG_STATUS_REG 0x54
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
+ * register a pci_driver, because someone else might one day
+ * want to register another driver on the same PCI id.
+ */
+static const struct pci_device_id pci_tbl[] = {
+	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), 0, },
+	{ 0, },	/* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, pci_tbl);
+
+struct amd_geode_priv {
+	struct pci_dev *pcidev;
+	void __iomem *membase;
+};
+
+static int geode_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	struct amd_geode_priv *priv = (struct amd_geode_priv *)rng->priv;
+	void __iomem *mem = priv->membase;
+
+	*data = readl(mem + GEODE_RNG_DATA_REG);
+
+	return 4;
+}
+
+static int geode_rng_data_present(struct hwrng *rng, int wait)
+{
+	struct amd_geode_priv *priv = (struct amd_geode_priv *)rng->priv;
+	void __iomem *mem = priv->membase;
+	int data, i;
+
+	for (i = 0; i < 20; i++) {
+		data = !!(readl(mem + GEODE_RNG_STATUS_REG));
+		if (data || !wait)
+			break;
+		udelay(10);
+	}
+	return data;
+}
+
+
+static struct hwrng geode_rng = {
+	.name		= "geode",
+	.data_present	= geode_rng_data_present,
+	.data_read	= geode_rng_data_read,
+};
+
+
+static int __init geode_rng_init(void)
+{
+	int err = -ENODEV;
+	struct pci_dev *pdev = NULL;
+	const struct pci_device_id *ent;
+	void __iomem *mem;
+	unsigned long rng_base;
+	struct amd_geode_priv *priv;
+
+	for_each_pci_dev(pdev) {
+		ent = pci_match_id(pci_tbl, pdev);
+		if (ent)
+			goto found;
+	}
+	/* Device not found. */
+	return err;
+
+found:
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		err = -ENOMEM;
+		goto put_dev;
+	}
+
+	rng_base = pci_resource_start(pdev, 0);
+	if (rng_base == 0)
+		goto free_priv;
+	err = -ENOMEM;
+	mem = ioremap(rng_base, 0x58);
+	if (!mem)
+		goto free_priv;
+
+	geode_rng.priv = (unsigned long)priv;
+	priv->membase = mem;
+	priv->pcidev = pdev;
+
+	pr_info("AMD Geode RNG detected\n");
+	err = hwrng_register(&geode_rng);
+	if (err) {
+		pr_err(PFX "RNG registering failed (%d)\n",
+		       err);
+		goto err_unmap;
+	}
+	return err;
+
+err_unmap:
+	iounmap(mem);
+free_priv:
+	kfree(priv);
+put_dev:
+	pci_dev_put(pdev);
+	return err;
+}
+
+static void __exit geode_rng_exit(void)
+{
+	struct amd_geode_priv *priv;
+
+	priv = (struct amd_geode_priv *)geode_rng.priv;
+	hwrng_unregister(&geode_rng);
+	iounmap(priv->membase);
+	pci_dev_put(priv->pcidev);
+	kfree(priv);
+}
+
+module_init(geode_rng_init);
+module_exit(geode_rng_exit);
+
+MODULE_DESCRIPTION("H/W RNG driver for AMD Geode LX CPUs");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/hisi-rng.c b/drivers/char/hw_random/hisi-rng.c
new file mode 100644
index 000000000..96438f85c
--- /dev/null
+++ b/drivers/char/hw_random/hisi-rng.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016 HiSilicon Co., Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+
+#define RNG_SEED	0x0
+#define RNG_CTRL	0x4
+  #define RNG_SEED_SEL	BIT(2)
+  #define RNG_RING_EN	BIT(1)
+  #define RNG_EN	BIT(0)
+#define RNG_RAN_NUM	0x10
+#define RNG_PHY_SEED	0x14
+
+#define to_hisi_rng(p)	container_of(p, struct hisi_rng, rng)
+
+static int seed_sel;
+module_param(seed_sel, int, S_IRUGO);
+MODULE_PARM_DESC(seed_sel, "Auto reload seed. 0, use LFSR(default); 1, use ring oscillator.");
+
+struct hisi_rng {
+	void __iomem *base;
+	struct hwrng rng;
+};
+
+static int hisi_rng_init(struct hwrng *rng)
+{
+	struct hisi_rng *hrng = to_hisi_rng(rng);
+	int val = RNG_EN;
+	u32 seed;
+
+	/* get a random number as initial seed */
+	get_random_bytes(&seed, sizeof(seed));
+
+	writel_relaxed(seed, hrng->base + RNG_SEED);
+
+	/**
+	 * The seed is reload periodically, there are two choice
+	 * of seeds, default seed using the value from LFSR, or
+	 * will use seed generated by ring oscillator.
+	 */
+	if (seed_sel == 1)
+		val |= RNG_RING_EN | RNG_SEED_SEL;
+
+	writel_relaxed(val, hrng->base + RNG_CTRL);
+	return 0;
+}
+
+static void hisi_rng_cleanup(struct hwrng *rng)
+{
+	struct hisi_rng *hrng = to_hisi_rng(rng);
+
+	writel_relaxed(0, hrng->base + RNG_CTRL);
+}
+
+static int hisi_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct hisi_rng *hrng = to_hisi_rng(rng);
+	u32 *data = buf;
+
+	*data = readl_relaxed(hrng->base + RNG_RAN_NUM);
+	return 4;
+}
+
+static int hisi_rng_probe(struct platform_device *pdev)
+{
+	struct hisi_rng *rng;
+	int ret;
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, rng);
+
+	rng->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rng->base))
+		return PTR_ERR(rng->base);
+
+	rng->rng.name = pdev->name;
+	rng->rng.init = hisi_rng_init;
+	rng->rng.cleanup = hisi_rng_cleanup;
+	rng->rng.read = hisi_rng_read;
+
+	ret = devm_hwrng_register(&pdev->dev, &rng->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register hwrng\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id hisi_rng_dt_ids[] __maybe_unused = {
+	{ .compatible = "hisilicon,hip04-rng" },
+	{ .compatible = "hisilicon,hip05-rng" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hisi_rng_dt_ids);
+
+static struct platform_driver hisi_rng_driver = {
+	.probe		= hisi_rng_probe,
+	.driver		= {
+		.name	= "hisi-rng",
+		.of_match_table = of_match_ptr(hisi_rng_dt_ids),
+	},
+};
+
+module_platform_driver(hisi_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kefeng Wang <wangkefeng.wang@huawei>");
+MODULE_DESCRIPTION("Hisilicon random number generator driver");
diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
new file mode 100644
index 000000000..75fb46298
--- /dev/null
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RNG driver for Freescale RNGC
+ *
+ * Copyright (C) 2008-2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2017 Martin Kaiser <martin@kaiser.cx>
+ */
+
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/hw_random.h>
+#include <linux/completion.h>
+#include <linux/io.h>
+
+#define RNGC_VER_ID			0x0000
+#define RNGC_COMMAND			0x0004
+#define RNGC_CONTROL			0x0008
+#define RNGC_STATUS			0x000C
+#define RNGC_ERROR			0x0010
+#define RNGC_FIFO			0x0014
+
+/* the fields in the ver id register */
+#define RNGC_TYPE_SHIFT		28
+#define RNGC_VER_MAJ_SHIFT		8
+
+/* the rng_type field */
+#define RNGC_TYPE_RNGB			0x1
+#define RNGC_TYPE_RNGC			0x2
+
+
+#define RNGC_CMD_CLR_ERR		0x00000020
+#define RNGC_CMD_CLR_INT		0x00000010
+#define RNGC_CMD_SEED			0x00000002
+#define RNGC_CMD_SELF_TEST		0x00000001
+
+#define RNGC_CTRL_MASK_ERROR		0x00000040
+#define RNGC_CTRL_MASK_DONE		0x00000020
+#define RNGC_CTRL_AUTO_SEED		0x00000010
+
+#define RNGC_STATUS_ERROR		0x00010000
+#define RNGC_STATUS_FIFO_LEVEL_MASK	0x00000f00
+#define RNGC_STATUS_FIFO_LEVEL_SHIFT	8
+#define RNGC_STATUS_SEED_DONE		0x00000020
+#define RNGC_STATUS_ST_DONE		0x00000010
+
+#define RNGC_ERROR_STATUS_STAT_ERR	0x00000008
+
+#define RNGC_TIMEOUT  3000 /* 3 sec */
+
+
+static bool self_test = true;
+module_param(self_test, bool, 0);
+
+struct imx_rngc {
+	struct device		*dev;
+	struct clk		*clk;
+	void __iomem		*base;
+	struct hwrng		rng;
+	struct completion	rng_op_done;
+	/*
+	 * err_reg is written only by the irq handler and read only
+	 * when interrupts are masked, we need no spinlock
+	 */
+	u32			err_reg;
+};
+
+
+static inline void imx_rngc_irq_mask_clear(struct imx_rngc *rngc)
+{
+	u32 ctrl, cmd;
+
+	/* mask interrupts */
+	ctrl = readl(rngc->base + RNGC_CONTROL);
+	ctrl |= RNGC_CTRL_MASK_DONE | RNGC_CTRL_MASK_ERROR;
+	writel(ctrl, rngc->base + RNGC_CONTROL);
+
+	/*
+	 * CLR_INT clears the interrupt only if there's no error
+	 * CLR_ERR clear the interrupt and the error register if there
+	 * is an error
+	 */
+	cmd = readl(rngc->base + RNGC_COMMAND);
+	cmd |= RNGC_CMD_CLR_INT | RNGC_CMD_CLR_ERR;
+	writel(cmd, rngc->base + RNGC_COMMAND);
+}
+
+static inline void imx_rngc_irq_unmask(struct imx_rngc *rngc)
+{
+	u32 ctrl;
+
+	ctrl = readl(rngc->base + RNGC_CONTROL);
+	ctrl &= ~(RNGC_CTRL_MASK_DONE | RNGC_CTRL_MASK_ERROR);
+	writel(ctrl, rngc->base + RNGC_CONTROL);
+}
+
+static int imx_rngc_self_test(struct imx_rngc *rngc)
+{
+	u32 cmd;
+	int ret;
+
+	imx_rngc_irq_unmask(rngc);
+
+	/* run self test */
+	cmd = readl(rngc->base + RNGC_COMMAND);
+	writel(cmd | RNGC_CMD_SELF_TEST, rngc->base + RNGC_COMMAND);
+
+	ret = wait_for_completion_timeout(&rngc->rng_op_done, msecs_to_jiffies(RNGC_TIMEOUT));
+	imx_rngc_irq_mask_clear(rngc);
+	if (!ret)
+		return -ETIMEDOUT;
+
+	return rngc->err_reg ? -EIO : 0;
+}
+
+static int imx_rngc_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	struct imx_rngc *rngc = container_of(rng, struct imx_rngc, rng);
+	unsigned int status;
+	unsigned int level;
+	int retval = 0;
+
+	while (max >= sizeof(u32)) {
+		status = readl(rngc->base + RNGC_STATUS);
+
+		/* is there some error while reading this random number? */
+		if (status & RNGC_STATUS_ERROR)
+			break;
+
+		/* how many random numbers are in FIFO? [0-16] */
+		level = (status & RNGC_STATUS_FIFO_LEVEL_MASK) >>
+			RNGC_STATUS_FIFO_LEVEL_SHIFT;
+
+		if (level) {
+			/* retrieve a random number from FIFO */
+			*(u32 *)data = readl(rngc->base + RNGC_FIFO);
+
+			retval += sizeof(u32);
+			data += sizeof(u32);
+			max -= sizeof(u32);
+		}
+	}
+
+	return retval ? retval : -EIO;
+}
+
+static irqreturn_t imx_rngc_irq(int irq, void *priv)
+{
+	struct imx_rngc *rngc = (struct imx_rngc *)priv;
+	u32 status;
+
+	/*
+	 * clearing the interrupt will also clear the error register
+	 * read error and status before clearing
+	 */
+	status = readl(rngc->base + RNGC_STATUS);
+	rngc->err_reg = readl(rngc->base + RNGC_ERROR);
+
+	imx_rngc_irq_mask_clear(rngc);
+
+	if (status & (RNGC_STATUS_SEED_DONE | RNGC_STATUS_ST_DONE))
+		complete(&rngc->rng_op_done);
+
+	return IRQ_HANDLED;
+}
+
+static int imx_rngc_init(struct hwrng *rng)
+{
+	struct imx_rngc *rngc = container_of(rng, struct imx_rngc, rng);
+	u32 cmd, ctrl;
+	int ret;
+
+	/* clear error */
+	cmd = readl(rngc->base + RNGC_COMMAND);
+	writel(cmd | RNGC_CMD_CLR_ERR, rngc->base + RNGC_COMMAND);
+
+	imx_rngc_irq_unmask(rngc);
+
+	/* create seed, repeat while there is some statistical error */
+	do {
+		/* seed creation */
+		cmd = readl(rngc->base + RNGC_COMMAND);
+		writel(cmd | RNGC_CMD_SEED, rngc->base + RNGC_COMMAND);
+
+		ret = wait_for_completion_timeout(&rngc->rng_op_done, msecs_to_jiffies(RNGC_TIMEOUT));
+		if (!ret) {
+			ret = -ETIMEDOUT;
+			goto err;
+		}
+
+	} while (rngc->err_reg == RNGC_ERROR_STATUS_STAT_ERR);
+
+	if (rngc->err_reg) {
+		ret = -EIO;
+		goto err;
+	}
+
+	/*
+	 * enable automatic seeding, the rngc creates a new seed automatically
+	 * after serving 2^20 random 160-bit words
+	 */
+	ctrl = readl(rngc->base + RNGC_CONTROL);
+	ctrl |= RNGC_CTRL_AUTO_SEED;
+	writel(ctrl, rngc->base + RNGC_CONTROL);
+
+	/*
+	 * if initialisation was successful, we keep the interrupt
+	 * unmasked until imx_rngc_cleanup is called
+	 * we mask the interrupt ourselves if we return an error
+	 */
+	return 0;
+
+err:
+	imx_rngc_irq_mask_clear(rngc);
+	return ret;
+}
+
+static void imx_rngc_cleanup(struct hwrng *rng)
+{
+	struct imx_rngc *rngc = container_of(rng, struct imx_rngc, rng);
+
+	imx_rngc_irq_mask_clear(rngc);
+}
+
+static int imx_rngc_probe(struct platform_device *pdev)
+{
+	struct imx_rngc *rngc;
+	int ret;
+	int irq;
+	u32 ver_id;
+	u8  rng_type;
+
+	rngc = devm_kzalloc(&pdev->dev, sizeof(*rngc), GFP_KERNEL);
+	if (!rngc)
+		return -ENOMEM;
+
+	rngc->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rngc->base))
+		return PTR_ERR(rngc->base);
+
+	rngc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(rngc->clk)) {
+		dev_err(&pdev->dev, "Can not get rng_clk\n");
+		return PTR_ERR(rngc->clk);
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ver_id = readl(rngc->base + RNGC_VER_ID);
+	rng_type = ver_id >> RNGC_TYPE_SHIFT;
+	/*
+	 * This driver supports only RNGC and RNGB. (There's a different
+	 * driver for RNGA.)
+	 */
+	if (rng_type != RNGC_TYPE_RNGC && rng_type != RNGC_TYPE_RNGB)
+		return -ENODEV;
+
+	init_completion(&rngc->rng_op_done);
+
+	rngc->rng.name = pdev->name;
+	rngc->rng.init = imx_rngc_init;
+	rngc->rng.read = imx_rngc_read;
+	rngc->rng.cleanup = imx_rngc_cleanup;
+	rngc->rng.quality = 19;
+
+	rngc->dev = &pdev->dev;
+	platform_set_drvdata(pdev, rngc);
+
+	imx_rngc_irq_mask_clear(rngc);
+
+	ret = devm_request_irq(&pdev->dev,
+			irq, imx_rngc_irq, 0, pdev->name, (void *)rngc);
+	if (ret) {
+		dev_err(rngc->dev, "Can't get interrupt working.\n");
+		return ret;
+	}
+
+	if (self_test) {
+		ret = imx_rngc_self_test(rngc);
+		if (ret) {
+			dev_err(rngc->dev, "self test failed\n");
+			return ret;
+		}
+	}
+
+	ret = devm_hwrng_register(&pdev->dev, &rngc->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "hwrng registration failed\n");
+		return ret;
+	}
+
+	dev_info(&pdev->dev,
+		"Freescale RNG%c registered (HW revision %d.%02d)\n",
+		rng_type == RNGC_TYPE_RNGB ? 'B' : 'C',
+		(ver_id >> RNGC_VER_MAJ_SHIFT) & 0xff, ver_id & 0xff);
+	return 0;
+}
+
+static int __maybe_unused imx_rngc_suspend(struct device *dev)
+{
+	struct imx_rngc *rngc = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(rngc->clk);
+
+	return 0;
+}
+
+static int __maybe_unused imx_rngc_resume(struct device *dev)
+{
+	struct imx_rngc *rngc = dev_get_drvdata(dev);
+
+	clk_prepare_enable(rngc->clk);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(imx_rngc_pm_ops, imx_rngc_suspend, imx_rngc_resume);
+
+static const struct of_device_id imx_rngc_dt_ids[] = {
+	{ .compatible = "fsl,imx25-rngb", .data = NULL, },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_rngc_dt_ids);
+
+static struct platform_driver imx_rngc_driver = {
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.pm = &imx_rngc_pm_ops,
+		.of_match_table = imx_rngc_dt_ids,
+	},
+};
+
+module_platform_driver_probe(imx_rngc_driver, imx_rngc_probe);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("H/W RNGC driver for i.MX");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/ingenic-rng.c b/drivers/char/hw_random/ingenic-rng.c
new file mode 100644
index 000000000..055cfe59f
--- /dev/null
+++ b/drivers/char/hw_random/ingenic-rng.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Ingenic Random Number Generator driver
+ * Copyright (c) 2017 PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
+ * Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* RNG register offsets */
+#define RNG_REG_ERNG_OFFSET		0x0
+#define RNG_REG_RNG_OFFSET		0x4
+
+/* bits within the ERND register */
+#define ERNG_READY				BIT(31)
+#define ERNG_ENABLE				BIT(0)
+
+enum ingenic_rng_version {
+	ID_JZ4780,
+	ID_X1000,
+};
+
+/* Device associated memory */
+struct ingenic_rng {
+	enum ingenic_rng_version version;
+
+	void __iomem *base;
+	struct hwrng rng;
+};
+
+static int ingenic_rng_init(struct hwrng *rng)
+{
+	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
+
+	writel(ERNG_ENABLE, priv->base + RNG_REG_ERNG_OFFSET);
+
+	return 0;
+}
+
+static void ingenic_rng_cleanup(struct hwrng *rng)
+{
+	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
+
+	writel(0, priv->base + RNG_REG_ERNG_OFFSET);
+}
+
+static int ingenic_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);
+	u32 *data = buf;
+	u32 status;
+	int ret;
+
+	if (priv->version >= ID_X1000) {
+		ret = readl_poll_timeout(priv->base + RNG_REG_ERNG_OFFSET, status,
+					 status & ERNG_READY, 10, 1000);
+		if (ret == -ETIMEDOUT) {
+			pr_err("%s: Wait for RNG data ready timeout\n", __func__);
+			return ret;
+		}
+	} else {
+		/*
+		 * A delay is required so that the current RNG data is not bit shifted
+		 * version of previous RNG data which could happen if random data is
+		 * read continuously from this device.
+		 */
+		udelay(20);
+	}
+
+	*data = readl(priv->base + RNG_REG_RNG_OFFSET);
+
+	return 4;
+}
+
+static int ingenic_rng_probe(struct platform_device *pdev)
+{
+	struct ingenic_rng *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base)) {
+		pr_err("%s: Failed to map RNG registers\n", __func__);
+		return PTR_ERR(priv->base);
+	}
+
+	priv->version = (enum ingenic_rng_version)of_device_get_match_data(&pdev->dev);
+
+	priv->rng.name = pdev->name;
+	priv->rng.init = ingenic_rng_init;
+	priv->rng.cleanup = ingenic_rng_cleanup;
+	priv->rng.read = ingenic_rng_read;
+
+	ret = hwrng_register(&priv->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register hwrng\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	dev_info(&pdev->dev, "Ingenic RNG driver registered\n");
+	return 0;
+}
+
+static int ingenic_rng_remove(struct platform_device *pdev)
+{
+	struct ingenic_rng *priv = platform_get_drvdata(pdev);
+
+	hwrng_unregister(&priv->rng);
+
+	writel(0, priv->base + RNG_REG_ERNG_OFFSET);
+
+	return 0;
+}
+
+static const struct of_device_id ingenic_rng_of_match[] = {
+	{ .compatible = "ingenic,jz4780-rng", .data = (void *) ID_JZ4780 },
+	{ .compatible = "ingenic,x1000-rng", .data = (void *) ID_X1000 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_rng_of_match);
+
+static struct platform_driver ingenic_rng_driver = {
+	.probe		= ingenic_rng_probe,
+	.remove		= ingenic_rng_remove,
+	.driver		= {
+		.name	= "ingenic-rng",
+		.of_match_table = ingenic_rng_of_match,
+	},
+};
+
+module_platform_driver(ingenic_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>");
+MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>");
+MODULE_DESCRIPTION("Ingenic Random Number Generator driver");
diff --git a/drivers/char/hw_random/ingenic-trng.c b/drivers/char/hw_random/ingenic-trng.c
new file mode 100644
index 000000000..0eb80f786
--- /dev/null
+++ b/drivers/char/hw_random/ingenic-trng.c
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Ingenic True Random Number Generator driver
+ * Copyright (c) 2019 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
+ * Copyright (c) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* DTRNG register offsets */
+#define TRNG_REG_CFG_OFFSET			0x00
+#define TRNG_REG_RANDOMNUM_OFFSET	0x04
+#define TRNG_REG_STATUS_OFFSET		0x08
+
+/* bits within the CFG register */
+#define CFG_RDY_CLR					BIT(12)
+#define CFG_INT_MASK				BIT(11)
+#define CFG_GEN_EN					BIT(0)
+
+/* bits within the STATUS register */
+#define STATUS_RANDOM_RDY			BIT(0)
+
+struct ingenic_trng {
+	void __iomem *base;
+	struct clk *clk;
+	struct hwrng rng;
+};
+
+static int ingenic_trng_init(struct hwrng *rng)
+{
+	struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
+	unsigned int ctrl;
+
+	ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
+	ctrl |= CFG_GEN_EN;
+	writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
+
+	return 0;
+}
+
+static void ingenic_trng_cleanup(struct hwrng *rng)
+{
+	struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
+	unsigned int ctrl;
+
+	ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
+	ctrl &= ~CFG_GEN_EN;
+	writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
+}
+
+static int ingenic_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct ingenic_trng *trng = container_of(rng, struct ingenic_trng, rng);
+	u32 *data = buf;
+	u32 status;
+	int ret;
+
+	ret = readl_poll_timeout(trng->base + TRNG_REG_STATUS_OFFSET, status,
+				 status & STATUS_RANDOM_RDY, 10, 1000);
+	if (ret == -ETIMEDOUT) {
+		pr_err("%s: Wait for DTRNG data ready timeout\n", __func__);
+		return ret;
+	}
+
+	*data = readl(trng->base + TRNG_REG_RANDOMNUM_OFFSET);
+
+	return 4;
+}
+
+static int ingenic_trng_probe(struct platform_device *pdev)
+{
+	struct ingenic_trng *trng;
+	int ret;
+
+	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+	if (!trng)
+		return -ENOMEM;
+
+	trng->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(trng->base)) {
+		pr_err("%s: Failed to map DTRNG registers\n", __func__);
+		ret = PTR_ERR(trng->base);
+		return PTR_ERR(trng->base);
+	}
+
+	trng->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(trng->clk)) {
+		ret = PTR_ERR(trng->clk);
+		pr_crit("%s: Cannot get DTRNG clock\n", __func__);
+		return PTR_ERR(trng->clk);
+	}
+
+	ret = clk_prepare_enable(trng->clk);
+	if (ret) {
+		pr_crit("%s: Unable to enable DTRNG clock\n", __func__);
+		return ret;
+	}
+
+	trng->rng.name = pdev->name;
+	trng->rng.init = ingenic_trng_init;
+	trng->rng.cleanup = ingenic_trng_cleanup;
+	trng->rng.read = ingenic_trng_read;
+
+	ret = hwrng_register(&trng->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register hwrng\n");
+		goto err_unprepare_clk;
+	}
+
+	platform_set_drvdata(pdev, trng);
+
+	dev_info(&pdev->dev, "Ingenic DTRNG driver registered\n");
+	return 0;
+
+err_unprepare_clk:
+	clk_disable_unprepare(trng->clk);
+	return ret;
+}
+
+static int ingenic_trng_remove(struct platform_device *pdev)
+{
+	struct ingenic_trng *trng = platform_get_drvdata(pdev);
+	unsigned int ctrl;
+
+	hwrng_unregister(&trng->rng);
+
+	ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);
+	ctrl &= ~CFG_GEN_EN;
+	writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);
+
+	clk_disable_unprepare(trng->clk);
+
+	return 0;
+}
+
+static const struct of_device_id ingenic_trng_of_match[] = {
+	{ .compatible = "ingenic,x1830-dtrng" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_trng_of_match);
+
+static struct platform_driver ingenic_trng_driver = {
+	.probe		= ingenic_trng_probe,
+	.remove		= ingenic_trng_remove,
+	.driver		= {
+		.name	= "ingenic-trng",
+		.of_match_table = ingenic_trng_of_match,
+	},
+};
+
+module_platform_driver(ingenic_trng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>");
+MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>");
+MODULE_DESCRIPTION("Ingenic True Random Number Generator driver");
diff --git a/drivers/char/hw_random/intel-rng.c b/drivers/char/hw_random/intel-rng.c
new file mode 100644
index 000000000..7b171cb3b
--- /dev/null
+++ b/drivers/char/hw_random/intel-rng.c
@@ -0,0 +1,418 @@
+/*
+ * RNG driver for Intel RNGs
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * with the majority of the code coming from:
+ *
+ * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
+ * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
+ *
+ * derived from
+ *
+ * Hardware driver for the AMD 768 Random Number Generator (RNG)
+ * (c) Copyright 2001 Red Hat Inc
+ *
+ * derived from
+ *
+ * Hardware driver for Intel i810 Random Number Generator (RNG)
+ * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/stop_machine.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+
+#define PFX	KBUILD_MODNAME ": "
+
+/*
+ * RNG registers
+ */
+#define INTEL_RNG_HW_STATUS			0
+#define         INTEL_RNG_PRESENT		0x40
+#define         INTEL_RNG_ENABLED		0x01
+#define INTEL_RNG_STATUS			1
+#define         INTEL_RNG_DATA_PRESENT		0x01
+#define INTEL_RNG_DATA				2
+
+/*
+ * Magic address at which Intel PCI bridges locate the RNG
+ */
+#define INTEL_RNG_ADDR				0xFFBC015F
+#define INTEL_RNG_ADDR_LEN			3
+
+/*
+ * LPC bridge PCI config space registers
+ */
+#define FWH_DEC_EN1_REG_OLD			0xe3
+#define FWH_DEC_EN1_REG_NEW			0xd9 /* high byte of 16-bit register */
+#define FWH_F8_EN_MASK				0x80
+
+#define BIOS_CNTL_REG_OLD			0x4e
+#define BIOS_CNTL_REG_NEW			0xdc
+#define BIOS_CNTL_WRITE_ENABLE_MASK		0x01
+#define BIOS_CNTL_LOCK_ENABLE_MASK		0x02
+
+/*
+ * Magic address at which Intel Firmware Hubs get accessed
+ */
+#define INTEL_FWH_ADDR				0xffff0000
+#define INTEL_FWH_ADDR_LEN			2
+
+/*
+ * Intel Firmware Hub command codes (write to any address inside the device)
+ */
+#define INTEL_FWH_RESET_CMD			0xff /* aka READ_ARRAY */
+#define INTEL_FWH_READ_ID_CMD			0x90
+
+/*
+ * Intel Firmware Hub Read ID command result addresses
+ */
+#define INTEL_FWH_MANUFACTURER_CODE_ADDRESS	0x000000
+#define INTEL_FWH_DEVICE_CODE_ADDRESS		0x000001
+
+/*
+ * Intel Firmware Hub Read ID command result values
+ */
+#define INTEL_FWH_MANUFACTURER_CODE		0x89
+#define INTEL_FWH_DEVICE_CODE_8M		0xac
+#define INTEL_FWH_DEVICE_CODE_4M		0xad
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
+ * register a pci_driver, because someone else might one day
+ * want to register another driver on the same PCI id.
+ */
+static const struct pci_device_id pci_tbl[] = {
+/* AA
+	{ PCI_DEVICE(0x8086, 0x2418) }, */
+	{ PCI_DEVICE(0x8086, 0x2410) }, /* AA */
+/* AB
+	{ PCI_DEVICE(0x8086, 0x2428) }, */
+	{ PCI_DEVICE(0x8086, 0x2420) }, /* AB */
+/* ??
+	{ PCI_DEVICE(0x8086, 0x2430) }, */
+/* BAM, CAM, DBM, FBM, GxM
+	{ PCI_DEVICE(0x8086, 0x2448) }, */
+	{ PCI_DEVICE(0x8086, 0x244c) }, /* BAM */
+	{ PCI_DEVICE(0x8086, 0x248c) }, /* CAM */
+	{ PCI_DEVICE(0x8086, 0x24cc) }, /* DBM */
+	{ PCI_DEVICE(0x8086, 0x2641) }, /* FBM */
+	{ PCI_DEVICE(0x8086, 0x27b9) }, /* GxM */
+	{ PCI_DEVICE(0x8086, 0x27bd) }, /* GxM DH */
+/* BA, CA, DB, Ex, 6300, Fx, 631x/632x, Gx
+	{ PCI_DEVICE(0x8086, 0x244e) }, */
+	{ PCI_DEVICE(0x8086, 0x2440) }, /* BA */
+	{ PCI_DEVICE(0x8086, 0x2480) }, /* CA */
+	{ PCI_DEVICE(0x8086, 0x24c0) }, /* DB */
+	{ PCI_DEVICE(0x8086, 0x24d0) }, /* Ex */
+	{ PCI_DEVICE(0x8086, 0x25a1) }, /* 6300 */
+	{ PCI_DEVICE(0x8086, 0x2640) }, /* Fx */
+	{ PCI_DEVICE(0x8086, 0x2670) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2671) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2672) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2673) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2674) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2675) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2676) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2677) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2678) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x2679) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x267a) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x267b) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x267c) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x267d) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x267e) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x267f) }, /* 631x/632x */
+	{ PCI_DEVICE(0x8086, 0x27b8) }, /* Gx */
+/* E
+	{ PCI_DEVICE(0x8086, 0x245e) }, */
+	{ PCI_DEVICE(0x8086, 0x2450) }, /* E  */
+	{ 0, },	/* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, pci_tbl);
+
+static __initdata int no_fwh_detect;
+module_param(no_fwh_detect, int, 0);
+MODULE_PARM_DESC(no_fwh_detect, "Skip FWH detection:\n"
+                                " positive value - skip if FWH space locked read-only\n"
+                                " negative value - skip always");
+
+static inline u8 hwstatus_get(void __iomem *mem)
+{
+	return readb(mem + INTEL_RNG_HW_STATUS);
+}
+
+static inline u8 hwstatus_set(void __iomem *mem,
+			      u8 hw_status)
+{
+	writeb(hw_status, mem + INTEL_RNG_HW_STATUS);
+	return hwstatus_get(mem);
+}
+
+static int intel_rng_data_present(struct hwrng *rng, int wait)
+{
+	void __iomem *mem = (void __iomem *)rng->priv;
+	int data, i;
+
+	for (i = 0; i < 20; i++) {
+		data = !!(readb(mem + INTEL_RNG_STATUS) &
+			  INTEL_RNG_DATA_PRESENT);
+		if (data || !wait)
+			break;
+		udelay(10);
+	}
+	return data;
+}
+
+static int intel_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	void __iomem *mem = (void __iomem *)rng->priv;
+
+	*data = readb(mem + INTEL_RNG_DATA);
+
+	return 1;
+}
+
+static int intel_rng_init(struct hwrng *rng)
+{
+	void __iomem *mem = (void __iomem *)rng->priv;
+	u8 hw_status;
+	int err = -EIO;
+
+	hw_status = hwstatus_get(mem);
+	/* turn RNG h/w on, if it's off */
+	if ((hw_status & INTEL_RNG_ENABLED) == 0)
+		hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
+	if ((hw_status & INTEL_RNG_ENABLED) == 0) {
+		pr_err(PFX "cannot enable RNG, aborting\n");
+		goto out;
+	}
+	err = 0;
+out:
+	return err;
+}
+
+static void intel_rng_cleanup(struct hwrng *rng)
+{
+	void __iomem *mem = (void __iomem *)rng->priv;
+	u8 hw_status;
+
+	hw_status = hwstatus_get(mem);
+	if (hw_status & INTEL_RNG_ENABLED)
+		hwstatus_set(mem, hw_status & ~INTEL_RNG_ENABLED);
+	else
+		pr_warn(PFX "unusual: RNG already disabled\n");
+}
+
+
+static struct hwrng intel_rng = {
+	.name		= "intel",
+	.init		= intel_rng_init,
+	.cleanup	= intel_rng_cleanup,
+	.data_present	= intel_rng_data_present,
+	.data_read	= intel_rng_data_read,
+};
+
+struct intel_rng_hw {
+	struct pci_dev *dev;
+	void __iomem *mem;
+	u8 bios_cntl_off;
+	u8 bios_cntl_val;
+	u8 fwh_dec_en1_off;
+	u8 fwh_dec_en1_val;
+};
+
+static int __init intel_rng_hw_init(void *_intel_rng_hw)
+{
+	struct intel_rng_hw *intel_rng_hw = _intel_rng_hw;
+	u8 mfc, dvc;
+
+	/* interrupts disabled in stop_machine call */
+
+	if (!(intel_rng_hw->fwh_dec_en1_val & FWH_F8_EN_MASK))
+		pci_write_config_byte(intel_rng_hw->dev,
+		                      intel_rng_hw->fwh_dec_en1_off,
+		                      intel_rng_hw->fwh_dec_en1_val |
+				      FWH_F8_EN_MASK);
+	if (!(intel_rng_hw->bios_cntl_val & BIOS_CNTL_WRITE_ENABLE_MASK))
+		pci_write_config_byte(intel_rng_hw->dev,
+		                      intel_rng_hw->bios_cntl_off,
+		                      intel_rng_hw->bios_cntl_val |
+				      BIOS_CNTL_WRITE_ENABLE_MASK);
+
+	writeb(INTEL_FWH_RESET_CMD, intel_rng_hw->mem);
+	writeb(INTEL_FWH_READ_ID_CMD, intel_rng_hw->mem);
+	mfc = readb(intel_rng_hw->mem + INTEL_FWH_MANUFACTURER_CODE_ADDRESS);
+	dvc = readb(intel_rng_hw->mem + INTEL_FWH_DEVICE_CODE_ADDRESS);
+	writeb(INTEL_FWH_RESET_CMD, intel_rng_hw->mem);
+
+	if (!(intel_rng_hw->bios_cntl_val &
+	      (BIOS_CNTL_LOCK_ENABLE_MASK|BIOS_CNTL_WRITE_ENABLE_MASK)))
+		pci_write_config_byte(intel_rng_hw->dev,
+				      intel_rng_hw->bios_cntl_off,
+				      intel_rng_hw->bios_cntl_val);
+	if (!(intel_rng_hw->fwh_dec_en1_val & FWH_F8_EN_MASK))
+		pci_write_config_byte(intel_rng_hw->dev,
+				      intel_rng_hw->fwh_dec_en1_off,
+				      intel_rng_hw->fwh_dec_en1_val);
+
+	if (mfc != INTEL_FWH_MANUFACTURER_CODE ||
+	    (dvc != INTEL_FWH_DEVICE_CODE_8M &&
+	     dvc != INTEL_FWH_DEVICE_CODE_4M)) {
+		pr_notice(PFX "FWH not detected\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int __init intel_init_hw_struct(struct intel_rng_hw *intel_rng_hw,
+					struct pci_dev *dev)
+{
+	intel_rng_hw->bios_cntl_val = 0xff;
+	intel_rng_hw->fwh_dec_en1_val = 0xff;
+	intel_rng_hw->dev = dev;
+
+	/* Check for Intel 82802 */
+	if (dev->device < 0x2640) {
+		intel_rng_hw->fwh_dec_en1_off = FWH_DEC_EN1_REG_OLD;
+		intel_rng_hw->bios_cntl_off = BIOS_CNTL_REG_OLD;
+	} else {
+		intel_rng_hw->fwh_dec_en1_off = FWH_DEC_EN1_REG_NEW;
+		intel_rng_hw->bios_cntl_off = BIOS_CNTL_REG_NEW;
+	}
+
+	pci_read_config_byte(dev, intel_rng_hw->fwh_dec_en1_off,
+			     &intel_rng_hw->fwh_dec_en1_val);
+	pci_read_config_byte(dev, intel_rng_hw->bios_cntl_off,
+			     &intel_rng_hw->bios_cntl_val);
+
+	if ((intel_rng_hw->bios_cntl_val &
+	     (BIOS_CNTL_LOCK_ENABLE_MASK|BIOS_CNTL_WRITE_ENABLE_MASK))
+	    == BIOS_CNTL_LOCK_ENABLE_MASK) {
+		static __initdata /*const*/ char warning[] =
+PFX "Firmware space is locked read-only. If you can't or\n"
+PFX "don't want to disable this in firmware setup, and if\n"
+PFX "you are certain that your system has a functional\n"
+PFX "RNG, try using the 'no_fwh_detect' option.\n";
+
+		if (no_fwh_detect)
+			return -ENODEV;
+		pr_warn("%s", warning);
+		return -EBUSY;
+	}
+
+	intel_rng_hw->mem = ioremap(INTEL_FWH_ADDR, INTEL_FWH_ADDR_LEN);
+	if (intel_rng_hw->mem == NULL)
+		return -EBUSY;
+
+	return 0;
+}
+
+
+static int __init intel_rng_mod_init(void)
+{
+	int err = -ENODEV;
+	int i;
+	struct pci_dev *dev = NULL;
+	void __iomem *mem;
+	u8 hw_status;
+	struct intel_rng_hw *intel_rng_hw;
+
+	for (i = 0; !dev && pci_tbl[i].vendor; ++i)
+		dev = pci_get_device(pci_tbl[i].vendor, pci_tbl[i].device,
+				     NULL);
+
+	if (!dev)
+		goto out; /* Device not found. */
+
+	if (no_fwh_detect < 0) {
+		pci_dev_put(dev);
+		goto fwh_done;
+	}
+
+	intel_rng_hw = kmalloc(sizeof(*intel_rng_hw), GFP_KERNEL);
+	if (!intel_rng_hw) {
+		pci_dev_put(dev);
+		goto out;
+	}
+
+	err = intel_init_hw_struct(intel_rng_hw, dev);
+	if (err) {
+		pci_dev_put(dev);
+		kfree(intel_rng_hw);
+		if (err == -ENODEV)
+			goto fwh_done;
+		goto out;
+	}
+
+	/*
+	 * Since the BIOS code/data is going to disappear from its normal
+	 * location with the Read ID command, all activity on the system
+	 * must be stopped until the state is back to normal.
+	 *
+	 * Use stop_machine because IPIs can be blocked by disabling
+	 * interrupts.
+	 */
+	err = stop_machine(intel_rng_hw_init, intel_rng_hw, NULL);
+	pci_dev_put(dev);
+	iounmap(intel_rng_hw->mem);
+	kfree(intel_rng_hw);
+	if (err)
+		goto out;
+
+fwh_done:
+	err = -ENOMEM;
+	mem = ioremap(INTEL_RNG_ADDR, INTEL_RNG_ADDR_LEN);
+	if (!mem)
+		goto out;
+	intel_rng.priv = (unsigned long)mem;
+
+	/* Check for Random Number Generator */
+	err = -ENODEV;
+	hw_status = hwstatus_get(mem);
+	if ((hw_status & INTEL_RNG_PRESENT) == 0) {
+		iounmap(mem);
+		goto out;
+	}
+
+	pr_info("Intel 82802 RNG detected\n");
+	err = hwrng_register(&intel_rng);
+	if (err) {
+		pr_err(PFX "RNG registering failed (%d)\n",
+		       err);
+		iounmap(mem);
+	}
+out:
+	return err;
+
+}
+
+static void __exit intel_rng_mod_exit(void)
+{
+	void __iomem *mem = (void __iomem *)intel_rng.priv;
+
+	hwrng_unregister(&intel_rng);
+	iounmap(mem);
+}
+
+module_init(intel_rng_mod_init);
+module_exit(intel_rng_mod_exit);
+
+MODULE_DESCRIPTION("H/W RNG driver for Intel chipsets");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
new file mode 100644
index 000000000..c0df053cb
--- /dev/null
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+* Copyright (C) 2015 Broadcom Corporation
+*
+*/
+/*
+ * DESCRIPTION: The Broadcom iProc RNG200 Driver
+ */
+
+#include <linux/hw_random.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+/* Registers */
+#define RNG_CTRL_OFFSET					0x00
+#define RNG_CTRL_RNG_RBGEN_MASK				0x00001FFF
+#define RNG_CTRL_RNG_RBGEN_ENABLE			0x00000001
+
+#define RNG_SOFT_RESET_OFFSET				0x04
+#define RNG_SOFT_RESET					0x00000001
+
+#define RBG_SOFT_RESET_OFFSET				0x08
+#define RBG_SOFT_RESET					0x00000001
+
+#define RNG_INT_STATUS_OFFSET				0x18
+#define RNG_INT_STATUS_MASTER_FAIL_LOCKOUT_IRQ_MASK	0x80000000
+#define RNG_INT_STATUS_STARTUP_TRANSITIONS_MET_IRQ_MASK	0x00020000
+#define RNG_INT_STATUS_NIST_FAIL_IRQ_MASK		0x00000020
+#define RNG_INT_STATUS_TOTAL_BITS_COUNT_IRQ_MASK	0x00000001
+
+#define RNG_FIFO_DATA_OFFSET				0x20
+
+#define RNG_FIFO_COUNT_OFFSET				0x24
+#define RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK		0x000000FF
+
+struct iproc_rng200_dev {
+	struct hwrng rng;
+	void __iomem *base;
+};
+
+#define to_rng_priv(rng)	container_of(rng, struct iproc_rng200_dev, rng)
+
+static void iproc_rng200_enable_set(void __iomem *rng_base, bool enable)
+{
+	u32 val;
+
+	val = ioread32(rng_base + RNG_CTRL_OFFSET);
+	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
+
+	if (enable)
+		val |= RNG_CTRL_RNG_RBGEN_ENABLE;
+
+	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
+}
+
+static void iproc_rng200_restart(void __iomem *rng_base)
+{
+	uint32_t val;
+
+	iproc_rng200_enable_set(rng_base, false);
+
+	/* Clear all interrupt status */
+	iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET);
+
+	/* Reset RNG and RBG */
+	val = ioread32(rng_base + RBG_SOFT_RESET_OFFSET);
+	val |= RBG_SOFT_RESET;
+	iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET);
+
+	val = ioread32(rng_base + RNG_SOFT_RESET_OFFSET);
+	val |= RNG_SOFT_RESET;
+	iowrite32(val, rng_base + RNG_SOFT_RESET_OFFSET);
+
+	val = ioread32(rng_base + RNG_SOFT_RESET_OFFSET);
+	val &= ~RNG_SOFT_RESET;
+	iowrite32(val, rng_base + RNG_SOFT_RESET_OFFSET);
+
+	val = ioread32(rng_base + RBG_SOFT_RESET_OFFSET);
+	val &= ~RBG_SOFT_RESET;
+	iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET);
+
+	iproc_rng200_enable_set(rng_base, true);
+}
+
+static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
+			     bool wait)
+{
+	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+	uint32_t num_remaining = max;
+	uint32_t status;
+
+	#define MAX_RESETS_PER_READ	1
+	uint32_t num_resets = 0;
+
+	#define MAX_IDLE_TIME	(1 * HZ)
+	unsigned long idle_endtime = jiffies + MAX_IDLE_TIME;
+
+	while ((num_remaining > 0) && time_before(jiffies, idle_endtime)) {
+
+		/* Is RNG sane? If not, reset it. */
+		status = ioread32(priv->base + RNG_INT_STATUS_OFFSET);
+		if ((status & (RNG_INT_STATUS_MASTER_FAIL_LOCKOUT_IRQ_MASK |
+			RNG_INT_STATUS_NIST_FAIL_IRQ_MASK)) != 0) {
+
+			if (num_resets >= MAX_RESETS_PER_READ)
+				return max - num_remaining;
+
+			iproc_rng200_restart(priv->base);
+			num_resets++;
+		}
+
+		/* Are there any random numbers available? */
+		if ((ioread32(priv->base + RNG_FIFO_COUNT_OFFSET) &
+				RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK) > 0) {
+
+			if (num_remaining >= sizeof(uint32_t)) {
+				/* Buffer has room to store entire word */
+				*(uint32_t *)buf = ioread32(priv->base +
+							RNG_FIFO_DATA_OFFSET);
+				buf += sizeof(uint32_t);
+				num_remaining -= sizeof(uint32_t);
+			} else {
+				/* Buffer can only store partial word */
+				uint32_t rnd_number = ioread32(priv->base +
+							RNG_FIFO_DATA_OFFSET);
+				memcpy(buf, &rnd_number, num_remaining);
+				buf += num_remaining;
+				num_remaining = 0;
+			}
+
+			/* Reset the IDLE timeout */
+			idle_endtime = jiffies + MAX_IDLE_TIME;
+		} else {
+			if (!wait)
+				/* Cannot wait, return immediately */
+				return max - num_remaining;
+
+			/* Can wait, give others chance to run */
+			usleep_range(min(num_remaining * 10, 500U), 500);
+		}
+	}
+
+	return max - num_remaining;
+}
+
+static int iproc_rng200_init(struct hwrng *rng)
+{
+	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+
+	iproc_rng200_enable_set(priv->base, true);
+
+	return 0;
+}
+
+static void iproc_rng200_cleanup(struct hwrng *rng)
+{
+	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+
+	iproc_rng200_enable_set(priv->base, false);
+}
+
+static int iproc_rng200_probe(struct platform_device *pdev)
+{
+	struct iproc_rng200_dev *priv;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	/* Map peripheral */
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base)) {
+		dev_err(dev, "failed to remap rng regs\n");
+		return PTR_ERR(priv->base);
+	}
+
+	dev_set_drvdata(dev, priv);
+
+	priv->rng.name = "iproc-rng200";
+	priv->rng.read = iproc_rng200_read;
+	priv->rng.init = iproc_rng200_init;
+	priv->rng.cleanup = iproc_rng200_cleanup;
+
+	/* Register driver */
+	ret = devm_hwrng_register(dev, &priv->rng);
+	if (ret) {
+		dev_err(dev, "hwrng registration failed\n");
+		return ret;
+	}
+
+	dev_info(dev, "hwrng registered\n");
+
+	return 0;
+}
+
+static int __maybe_unused iproc_rng200_suspend(struct device *dev)
+{
+	struct iproc_rng200_dev *priv = dev_get_drvdata(dev);
+
+	iproc_rng200_cleanup(&priv->rng);
+
+	return 0;
+}
+
+static int __maybe_unused iproc_rng200_resume(struct device *dev)
+{
+	struct iproc_rng200_dev *priv =  dev_get_drvdata(dev);
+
+	iproc_rng200_init(&priv->rng);
+
+	return 0;
+}
+
+static const struct dev_pm_ops iproc_rng200_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(iproc_rng200_suspend, iproc_rng200_resume)
+};
+
+static const struct of_device_id iproc_rng200_of_match[] = {
+	{ .compatible = "brcm,bcm2711-rng200", },
+	{ .compatible = "brcm,bcm7211-rng200", },
+	{ .compatible = "brcm,bcm7278-rng200", },
+	{ .compatible = "brcm,iproc-rng200", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_rng200_of_match);
+
+static struct platform_driver iproc_rng200_driver = {
+	.driver = {
+		.name		= "iproc-rng200",
+		.of_match_table = iproc_rng200_of_match,
+		.pm		= &iproc_rng200_pm_ops,
+	},
+	.probe		= iproc_rng200_probe,
+};
+module_platform_driver(iproc_rng200_driver);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("iProc RNG200 Random Number Generator driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/ixp4xx-rng.c b/drivers/char/hw_random/ixp4xx-rng.c
new file mode 100644
index 000000000..7df5e9f75
--- /dev/null
+++ b/drivers/char/hw_random/ixp4xx-rng.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * drivers/char/hw_random/ixp4xx-rng.c
+ *
+ * RNG driver for Intel IXP4xx family of NPUs
+ *
+ * Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * Fixes by Michael Buesch
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/hw_random.h>
+#include <linux/of.h>
+#include <linux/soc/ixp4xx/cpu.h>
+
+#include <asm/io.h>
+
+static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer)
+{
+	void __iomem * rng_base = (void __iomem *)rng->priv;
+
+	*buffer = __raw_readl(rng_base);
+
+	return 4;
+}
+
+static struct hwrng ixp4xx_rng_ops = {
+	.name		= "ixp4xx",
+	.data_read	= ixp4xx_rng_data_read,
+};
+
+static int ixp4xx_rng_probe(struct platform_device *pdev)
+{
+	void __iomem * rng_base;
+	struct device *dev = &pdev->dev;
+
+	if (!cpu_is_ixp46x()) /* includes IXP455 */
+		return -ENOSYS;
+
+	rng_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rng_base))
+		return PTR_ERR(rng_base);
+
+	ixp4xx_rng_ops.priv = (unsigned long)rng_base;
+	return devm_hwrng_register(dev, &ixp4xx_rng_ops);
+}
+
+static const struct of_device_id ixp4xx_rng_of_match[] = {
+	{
+		.compatible = "intel,ixp46x-rng",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ixp4xx_rng_of_match);
+
+static struct platform_driver ixp4xx_rng_driver = {
+	.driver = {
+		.name = "ixp4xx-hwrandom",
+		.of_match_table = ixp4xx_rng_of_match,
+	},
+	.probe = ixp4xx_rng_probe,
+};
+module_platform_driver(ixp4xx_rng_driver);
+
+MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
+MODULE_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/ks-sa-rng.c b/drivers/char/hw_random/ks-sa-rng.c
new file mode 100644
index 000000000..2f2f21f1b
--- /dev/null
+++ b/drivers/char/hw_random/ks-sa-rng.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Random Number Generator driver for the Keystone SOC
+ *
+ * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com
+ *
+ * Authors:	Sandeep Nair
+ *		Vitaly Andrianov
+ */
+
+#include <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/pm_runtime.h>
+#include <linux/err.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+#include <linux/timekeeping.h>
+
+#define SA_CMD_STATUS_OFS			0x8
+
+/* TRNG enable control in SA System module*/
+#define SA_CMD_STATUS_REG_TRNG_ENABLE		BIT(3)
+
+/* TRNG start control in TRNG module */
+#define TRNG_CNTL_REG_TRNG_ENABLE		BIT(10)
+
+/* Data ready indicator in STATUS register */
+#define TRNG_STATUS_REG_READY			BIT(0)
+
+/* Data ready clear control in INTACK register */
+#define TRNG_INTACK_REG_READY			BIT(0)
+
+/*
+ * Number of samples taken to gather entropy during startup.
+ * If value is 0, the number of samples is 2^24 else
+ * equals value times 2^8.
+ */
+#define TRNG_DEF_STARTUP_CYCLES			0
+#define TRNG_CNTL_REG_STARTUP_CYCLES_SHIFT	16
+
+/*
+ * Minimum number of samples taken to regenerate entropy
+ * If value is 0, the number of samples is 2^24 else
+ * equals value times 2^6.
+ */
+#define TRNG_DEF_MIN_REFILL_CYCLES		1
+#define TRNG_CFG_REG_MIN_REFILL_CYCLES_SHIFT	0
+
+/*
+ * Maximum number of samples taken to regenerate entropy
+ * If value is 0, the number of samples is 2^24 else
+ * equals value times 2^8.
+ */
+#define TRNG_DEF_MAX_REFILL_CYCLES		0
+#define TRNG_CFG_REG_MAX_REFILL_CYCLES_SHIFT	16
+
+/* Number of CLK input cycles between samples */
+#define TRNG_DEF_CLK_DIV_CYCLES			0
+#define TRNG_CFG_REG_SAMPLE_DIV_SHIFT		8
+
+/* Maximum retries to get rng data */
+#define SA_MAX_RNG_DATA_RETRIES			5
+/* Delay between retries (in usecs) */
+#define SA_RNG_DATA_RETRY_DELAY			5
+
+struct trng_regs {
+	u32	output_l;
+	u32	output_h;
+	u32	status;
+	u32	intmask;
+	u32	intack;
+	u32	control;
+	u32	config;
+};
+
+struct ks_sa_rng {
+	struct device	*dev;
+	struct hwrng	rng;
+	struct clk	*clk;
+	struct regmap	*regmap_cfg;
+	struct trng_regs __iomem *reg_rng;
+	u64 ready_ts;
+	unsigned int refill_delay_ns;
+};
+
+static unsigned int cycles_to_ns(unsigned long clk_rate, unsigned int cycles)
+{
+	return DIV_ROUND_UP_ULL((TRNG_DEF_CLK_DIV_CYCLES + 1) * 1000000000ull *
+				cycles, clk_rate);
+}
+
+static unsigned int startup_delay_ns(unsigned long clk_rate)
+{
+	if (!TRNG_DEF_STARTUP_CYCLES)
+		return cycles_to_ns(clk_rate, BIT(24));
+	return cycles_to_ns(clk_rate, 256 * TRNG_DEF_STARTUP_CYCLES);
+}
+
+static unsigned int refill_delay_ns(unsigned long clk_rate)
+{
+	if (!TRNG_DEF_MAX_REFILL_CYCLES)
+		return cycles_to_ns(clk_rate, BIT(24));
+	return cycles_to_ns(clk_rate, 256 * TRNG_DEF_MAX_REFILL_CYCLES);
+}
+
+static int ks_sa_rng_init(struct hwrng *rng)
+{
+	u32 value;
+	struct device *dev = (struct device *)rng->priv;
+	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	unsigned long clk_rate = clk_get_rate(ks_sa_rng->clk);
+
+	/* Enable RNG module */
+	regmap_write_bits(ks_sa_rng->regmap_cfg, SA_CMD_STATUS_OFS,
+			  SA_CMD_STATUS_REG_TRNG_ENABLE,
+			  SA_CMD_STATUS_REG_TRNG_ENABLE);
+
+	/* Configure RNG module */
+	writel(0, &ks_sa_rng->reg_rng->control);
+	value = TRNG_DEF_STARTUP_CYCLES << TRNG_CNTL_REG_STARTUP_CYCLES_SHIFT;
+	writel(value, &ks_sa_rng->reg_rng->control);
+
+	value =	(TRNG_DEF_MIN_REFILL_CYCLES <<
+		 TRNG_CFG_REG_MIN_REFILL_CYCLES_SHIFT) |
+		(TRNG_DEF_MAX_REFILL_CYCLES <<
+		 TRNG_CFG_REG_MAX_REFILL_CYCLES_SHIFT) |
+		(TRNG_DEF_CLK_DIV_CYCLES <<
+		 TRNG_CFG_REG_SAMPLE_DIV_SHIFT);
+
+	writel(value, &ks_sa_rng->reg_rng->config);
+
+	/* Disable all interrupts from TRNG */
+	writel(0, &ks_sa_rng->reg_rng->intmask);
+
+	/* Enable RNG */
+	value = readl(&ks_sa_rng->reg_rng->control);
+	value |= TRNG_CNTL_REG_TRNG_ENABLE;
+	writel(value, &ks_sa_rng->reg_rng->control);
+
+	ks_sa_rng->refill_delay_ns = refill_delay_ns(clk_rate);
+	ks_sa_rng->ready_ts = ktime_get_ns() +
+			      startup_delay_ns(clk_rate);
+
+	return 0;
+}
+
+static void ks_sa_rng_cleanup(struct hwrng *rng)
+{
+	struct device *dev = (struct device *)rng->priv;
+	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+
+	/* Disable RNG */
+	writel(0, &ks_sa_rng->reg_rng->control);
+	regmap_write_bits(ks_sa_rng->regmap_cfg, SA_CMD_STATUS_OFS,
+			  SA_CMD_STATUS_REG_TRNG_ENABLE, 0);
+}
+
+static int ks_sa_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	struct device *dev = (struct device *)rng->priv;
+	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+
+	/* Read random data */
+	data[0] = readl(&ks_sa_rng->reg_rng->output_l);
+	data[1] = readl(&ks_sa_rng->reg_rng->output_h);
+
+	writel(TRNG_INTACK_REG_READY, &ks_sa_rng->reg_rng->intack);
+	ks_sa_rng->ready_ts = ktime_get_ns() + ks_sa_rng->refill_delay_ns;
+
+	return sizeof(u32) * 2;
+}
+
+static int ks_sa_rng_data_present(struct hwrng *rng, int wait)
+{
+	struct device *dev = (struct device *)rng->priv;
+	struct ks_sa_rng *ks_sa_rng = dev_get_drvdata(dev);
+	u64 now = ktime_get_ns();
+
+	u32	ready;
+	int	j;
+
+	if (wait && now < ks_sa_rng->ready_ts) {
+		/* Max delay expected here is 81920000 ns */
+		unsigned long min_delay =
+			DIV_ROUND_UP((u32)(ks_sa_rng->ready_ts - now), 1000);
+
+		usleep_range(min_delay, min_delay + SA_RNG_DATA_RETRY_DELAY);
+	}
+
+	for (j = 0; j < SA_MAX_RNG_DATA_RETRIES; j++) {
+		ready = readl(&ks_sa_rng->reg_rng->status);
+		ready &= TRNG_STATUS_REG_READY;
+
+		if (ready || !wait)
+			break;
+
+		udelay(SA_RNG_DATA_RETRY_DELAY);
+	}
+
+	return ready;
+}
+
+static int ks_sa_rng_probe(struct platform_device *pdev)
+{
+	struct ks_sa_rng	*ks_sa_rng;
+	struct device		*dev = &pdev->dev;
+	int			ret;
+
+	ks_sa_rng = devm_kzalloc(dev, sizeof(*ks_sa_rng), GFP_KERNEL);
+	if (!ks_sa_rng)
+		return -ENOMEM;
+
+	ks_sa_rng->dev = dev;
+	ks_sa_rng->rng = (struct hwrng) {
+		.name = "ks_sa_hwrng",
+		.init = ks_sa_rng_init,
+		.data_read = ks_sa_rng_data_read,
+		.data_present = ks_sa_rng_data_present,
+		.cleanup = ks_sa_rng_cleanup,
+	};
+	ks_sa_rng->rng.priv = (unsigned long)dev;
+
+	ks_sa_rng->reg_rng = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(ks_sa_rng->reg_rng))
+		return PTR_ERR(ks_sa_rng->reg_rng);
+
+	ks_sa_rng->regmap_cfg =
+		syscon_regmap_lookup_by_phandle(dev->of_node,
+						"ti,syscon-sa-cfg");
+
+	if (IS_ERR(ks_sa_rng->regmap_cfg)) {
+		dev_err(dev, "syscon_node_to_regmap failed\n");
+		return -EINVAL;
+	}
+
+	pm_runtime_enable(dev);
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable SA power-domain\n");
+		pm_runtime_disable(dev);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, ks_sa_rng);
+
+	return devm_hwrng_register(&pdev->dev, &ks_sa_rng->rng);
+}
+
+static int ks_sa_rng_remove(struct platform_device *pdev)
+{
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id ks_sa_rng_dt_match[] = {
+	{
+		.compatible = "ti,keystone-rng",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ks_sa_rng_dt_match);
+
+static struct platform_driver ks_sa_rng_driver = {
+	.driver		= {
+		.name	= "ks-sa-rng",
+		.of_match_table = ks_sa_rng_dt_match,
+	},
+	.probe		= ks_sa_rng_probe,
+	.remove		= ks_sa_rng_remove,
+};
+
+module_platform_driver(ks_sa_rng_driver);
+
+MODULE_DESCRIPTION("Keystone NETCP SA H/W Random Number Generator driver");
+MODULE_AUTHOR("Vitaly Andrianov <vitalya@ti.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c
new file mode 100644
index 000000000..8bb30282c
--- /dev/null
+++ b/drivers/char/hw_random/meson-rng.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (c) 2016 BayLibre, SAS.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ * Copyright (C) 2014 Amlogic, Inc.
+ */
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/hw_random.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+
+#define RNG_DATA 0x00
+
+struct meson_rng_data {
+	void __iomem *base;
+	struct platform_device *pdev;
+	struct hwrng rng;
+	struct clk *core_clk;
+};
+
+static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct meson_rng_data *data =
+			container_of(rng, struct meson_rng_data, rng);
+
+	*(u32 *)buf = readl_relaxed(data->base + RNG_DATA);
+
+	return sizeof(u32);
+}
+
+static void meson_rng_clk_disable(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
+static int meson_rng_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct meson_rng_data *data;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->pdev = pdev;
+
+	data->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(data->base))
+		return PTR_ERR(data->base);
+
+	data->core_clk = devm_clk_get_optional(dev, "core");
+	if (IS_ERR(data->core_clk))
+		return dev_err_probe(dev, PTR_ERR(data->core_clk),
+				     "Failed to get core clock\n");
+
+	if (data->core_clk) {
+		ret = clk_prepare_enable(data->core_clk);
+		if (ret)
+			return ret;
+		ret = devm_add_action_or_reset(dev, meson_rng_clk_disable,
+					       data->core_clk);
+		if (ret)
+			return ret;
+	}
+
+	data->rng.name = pdev->name;
+	data->rng.read = meson_rng_read;
+
+	platform_set_drvdata(pdev, data);
+
+	return devm_hwrng_register(dev, &data->rng);
+}
+
+static const struct of_device_id meson_rng_of_match[] = {
+	{ .compatible = "amlogic,meson-rng", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, meson_rng_of_match);
+
+static struct platform_driver meson_rng_driver = {
+	.probe	= meson_rng_probe,
+	.driver	= {
+		.name = "meson-rng",
+		.of_match_table = meson_rng_of_match,
+	},
+};
+
+module_platform_driver(meson_rng_driver);
+
+MODULE_DESCRIPTION("Meson H/W Random Number Generator driver");
+MODULE_AUTHOR("Lawrence Mok <lawrence.mok@amlogic.com>");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/char/hw_random/mpfs-rng.c b/drivers/char/hw_random/mpfs-rng.c
new file mode 100644
index 000000000..5813da617
--- /dev/null
+++ b/drivers/char/hw_random/mpfs-rng.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip PolarFire SoC (MPFS) hardware random driver
+ *
+ * Copyright (c) 2020-2022 Microchip Corporation. All rights reserved.
+ *
+ * Author: Conor Dooley <conor.dooley@microchip.com>
+ */
+
+#include <linux/module.h>
+#include <linux/hw_random.h>
+#include <linux/platform_device.h>
+#include <soc/microchip/mpfs.h>
+
+#define CMD_OPCODE	0x21
+#define CMD_DATA_SIZE	0U
+#define CMD_DATA	NULL
+#define MBOX_OFFSET	0U
+#define RESP_OFFSET	0U
+#define RNG_RESP_BYTES	32U
+
+struct mpfs_rng {
+	struct mpfs_sys_controller *sys_controller;
+	struct hwrng rng;
+};
+
+static int mpfs_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct mpfs_rng *rng_priv = container_of(rng, struct mpfs_rng, rng);
+	u32 response_msg[RNG_RESP_BYTES / sizeof(u32)];
+	unsigned int count = 0, copy_size_bytes;
+	int ret;
+
+	struct mpfs_mss_response response = {
+		.resp_status = 0U,
+		.resp_msg = (u32 *)response_msg,
+		.resp_size = RNG_RESP_BYTES
+	};
+	struct mpfs_mss_msg msg = {
+		.cmd_opcode = CMD_OPCODE,
+		.cmd_data_size = CMD_DATA_SIZE,
+		.response = &response,
+		.cmd_data = CMD_DATA,
+		.mbox_offset = MBOX_OFFSET,
+		.resp_offset = RESP_OFFSET
+	};
+
+	while (count < max) {
+		ret = mpfs_blocking_transaction(rng_priv->sys_controller, &msg);
+		if (ret)
+			return ret;
+
+		copy_size_bytes = max - count > RNG_RESP_BYTES ? RNG_RESP_BYTES : max - count;
+		memcpy(buf + count, response_msg, copy_size_bytes);
+
+		count += copy_size_bytes;
+		if (!wait)
+			break;
+	}
+
+	return count;
+}
+
+static int mpfs_rng_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mpfs_rng *rng_priv;
+	int ret;
+
+	rng_priv = devm_kzalloc(dev, sizeof(*rng_priv), GFP_KERNEL);
+	if (!rng_priv)
+		return -ENOMEM;
+
+	rng_priv->sys_controller =  mpfs_sys_controller_get(&pdev->dev);
+	if (IS_ERR(rng_priv->sys_controller))
+		return dev_err_probe(dev, PTR_ERR(rng_priv->sys_controller),
+				     "Failed to register system controller hwrng sub device\n");
+
+	rng_priv->rng.read = mpfs_rng_read;
+	rng_priv->rng.name = pdev->name;
+	rng_priv->rng.quality = 1024;
+
+	platform_set_drvdata(pdev, rng_priv);
+
+	ret = devm_hwrng_register(&pdev->dev, &rng_priv->rng);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "Failed to register MPFS hwrng\n");
+
+	dev_info(&pdev->dev, "Registered MPFS hwrng\n");
+
+	return 0;
+}
+
+static struct platform_driver mpfs_rng_driver = {
+	.driver = {
+		.name = "mpfs-rng",
+	},
+	.probe = mpfs_rng_probe,
+};
+module_platform_driver(mpfs_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>");
+MODULE_DESCRIPTION("PolarFire SoC (MPFS) hardware random driver");
diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c
new file mode 100644
index 000000000..6c00ea008
--- /dev/null
+++ b/drivers/char/hw_random/mtk-rng.c
@@ -0,0 +1,200 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Mediatek Hardware Random Number Generator
+ *
+ * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com>
+ */
+#define MTK_RNG_DEV KBUILD_MODNAME
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+/* Runtime PM autosuspend timeout: */
+#define RNG_AUTOSUSPEND_TIMEOUT		100
+
+#define USEC_POLL			2
+#define TIMEOUT_POLL			20
+
+#define RNG_CTRL			0x00
+#define RNG_EN				BIT(0)
+#define RNG_READY			BIT(31)
+
+#define RNG_DATA			0x08
+
+#define to_mtk_rng(p)	container_of(p, struct mtk_rng, rng)
+
+struct mtk_rng {
+	void __iomem *base;
+	struct clk *clk;
+	struct hwrng rng;
+};
+
+static int mtk_rng_init(struct hwrng *rng)
+{
+	struct mtk_rng *priv = to_mtk_rng(rng);
+	u32 val;
+	int err;
+
+	err = clk_prepare_enable(priv->clk);
+	if (err)
+		return err;
+
+	val = readl(priv->base + RNG_CTRL);
+	val |= RNG_EN;
+	writel(val, priv->base + RNG_CTRL);
+
+	return 0;
+}
+
+static void mtk_rng_cleanup(struct hwrng *rng)
+{
+	struct mtk_rng *priv = to_mtk_rng(rng);
+	u32 val;
+
+	val = readl(priv->base + RNG_CTRL);
+	val &= ~RNG_EN;
+	writel(val, priv->base + RNG_CTRL);
+
+	clk_disable_unprepare(priv->clk);
+}
+
+static bool mtk_rng_wait_ready(struct hwrng *rng, bool wait)
+{
+	struct mtk_rng *priv = to_mtk_rng(rng);
+	int ready;
+
+	ready = readl(priv->base + RNG_CTRL) & RNG_READY;
+	if (!ready && wait)
+		readl_poll_timeout_atomic(priv->base + RNG_CTRL, ready,
+					  ready & RNG_READY, USEC_POLL,
+					  TIMEOUT_POLL);
+	return !!ready;
+}
+
+static int mtk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct mtk_rng *priv = to_mtk_rng(rng);
+	int retval = 0;
+
+	pm_runtime_get_sync((struct device *)priv->rng.priv);
+
+	while (max >= sizeof(u32)) {
+		if (!mtk_rng_wait_ready(rng, wait))
+			break;
+
+		*(u32 *)buf = readl(priv->base + RNG_DATA);
+		retval += sizeof(u32);
+		buf += sizeof(u32);
+		max -= sizeof(u32);
+	}
+
+	pm_runtime_mark_last_busy((struct device *)priv->rng.priv);
+	pm_runtime_put_sync_autosuspend((struct device *)priv->rng.priv);
+
+	return retval || !wait ? retval : -EIO;
+}
+
+static int mtk_rng_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct mtk_rng *priv;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->rng.name = pdev->name;
+#ifndef CONFIG_PM
+	priv->rng.init = mtk_rng_init;
+	priv->rng.cleanup = mtk_rng_cleanup;
+#endif
+	priv->rng.read = mtk_rng_read;
+	priv->rng.priv = (unsigned long)&pdev->dev;
+	priv->rng.quality = 900;
+
+	priv->clk = devm_clk_get(&pdev->dev, "rng");
+	if (IS_ERR(priv->clk)) {
+		ret = PTR_ERR(priv->clk);
+		dev_err(&pdev->dev, "no clock for device: %d\n", ret);
+		return ret;
+	}
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	ret = devm_hwrng_register(&pdev->dev, &priv->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register rng device: %d\n",
+			ret);
+		return ret;
+	}
+
+	dev_set_drvdata(&pdev->dev, priv);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, RNG_AUTOSUSPEND_TIMEOUT);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	dev_info(&pdev->dev, "registered RNG driver\n");
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int mtk_rng_runtime_suspend(struct device *dev)
+{
+	struct mtk_rng *priv = dev_get_drvdata(dev);
+
+	mtk_rng_cleanup(&priv->rng);
+
+	return 0;
+}
+
+static int mtk_rng_runtime_resume(struct device *dev)
+{
+	struct mtk_rng *priv = dev_get_drvdata(dev);
+
+	return mtk_rng_init(&priv->rng);
+}
+
+static const struct dev_pm_ops mtk_rng_pm_ops = {
+	SET_RUNTIME_PM_OPS(mtk_rng_runtime_suspend,
+			   mtk_rng_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
+#define MTK_RNG_PM_OPS (&mtk_rng_pm_ops)
+#else	/* CONFIG_PM */
+#define MTK_RNG_PM_OPS NULL
+#endif	/* CONFIG_PM */
+
+static const struct of_device_id mtk_rng_match[] = {
+	{ .compatible = "mediatek,mt7623-rng" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_rng_match);
+
+static struct platform_driver mtk_rng_driver = {
+	.probe          = mtk_rng_probe,
+	.driver = {
+		.name = MTK_RNG_DEV,
+		.pm = MTK_RNG_PM_OPS,
+		.of_match_table = mtk_rng_match,
+	},
+};
+
+module_platform_driver(mtk_rng_driver);
+
+MODULE_DESCRIPTION("Mediatek Random Number Generator Driver");
+MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
new file mode 100644
index 000000000..008763c98
--- /dev/null
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RNG driver for Freescale RNGA
+ *
+ * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Author: Alan Carvalho de Assis <acassis@gmail.com>
+ */
+
+/*
+ *
+ * This driver is based on other RNG drivers.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+/* RNGA Registers */
+#define RNGA_CONTROL			0x00
+#define RNGA_STATUS			0x04
+#define RNGA_ENTROPY			0x08
+#define RNGA_OUTPUT_FIFO		0x0c
+#define RNGA_MODE			0x10
+#define RNGA_VERIFICATION_CONTROL	0x14
+#define RNGA_OSC_CONTROL_COUNTER	0x18
+#define RNGA_OSC1_COUNTER		0x1c
+#define RNGA_OSC2_COUNTER		0x20
+#define RNGA_OSC_COUNTER_STATUS		0x24
+
+/* RNGA Registers Range */
+#define RNG_ADDR_RANGE			0x28
+
+/* RNGA Control Register */
+#define RNGA_CONTROL_SLEEP		0x00000010
+#define RNGA_CONTROL_CLEAR_INT		0x00000008
+#define RNGA_CONTROL_MASK_INTS		0x00000004
+#define RNGA_CONTROL_HIGH_ASSURANCE	0x00000002
+#define RNGA_CONTROL_GO			0x00000001
+
+#define RNGA_STATUS_LEVEL_MASK		0x0000ff00
+
+/* RNGA Status Register */
+#define RNGA_STATUS_OSC_DEAD		0x80000000
+#define RNGA_STATUS_SLEEP		0x00000010
+#define RNGA_STATUS_ERROR_INT		0x00000008
+#define RNGA_STATUS_FIFO_UNDERFLOW	0x00000004
+#define RNGA_STATUS_LAST_READ_STATUS	0x00000002
+#define RNGA_STATUS_SECURITY_VIOLATION	0x00000001
+
+struct mxc_rng {
+	struct device *dev;
+	struct hwrng rng;
+	void __iomem *mem;
+	struct clk *clk;
+};
+
+static int mxc_rnga_data_present(struct hwrng *rng, int wait)
+{
+	int i;
+	struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng);
+
+	for (i = 0; i < 20; i++) {
+		/* how many random numbers are in FIFO? [0-16] */
+		int level = (__raw_readl(mxc_rng->mem + RNGA_STATUS) &
+				RNGA_STATUS_LEVEL_MASK) >> 8;
+		if (level || !wait)
+			return !!level;
+		udelay(10);
+	}
+	return 0;
+}
+
+static int mxc_rnga_data_read(struct hwrng *rng, u32 * data)
+{
+	int err;
+	u32 ctrl;
+	struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng);
+
+	/* retrieve a random number from FIFO */
+	*data = __raw_readl(mxc_rng->mem + RNGA_OUTPUT_FIFO);
+
+	/* some error while reading this random number? */
+	err = __raw_readl(mxc_rng->mem + RNGA_STATUS) & RNGA_STATUS_ERROR_INT;
+
+	/* if error: clear error interrupt, but doesn't return random number */
+	if (err) {
+		dev_dbg(mxc_rng->dev, "Error while reading random number!\n");
+		ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL);
+		__raw_writel(ctrl | RNGA_CONTROL_CLEAR_INT,
+					mxc_rng->mem + RNGA_CONTROL);
+		return 0;
+	} else
+		return 4;
+}
+
+static int mxc_rnga_init(struct hwrng *rng)
+{
+	u32 ctrl, osc;
+	struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng);
+
+	/* wake up */
+	ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL);
+	__raw_writel(ctrl & ~RNGA_CONTROL_SLEEP, mxc_rng->mem + RNGA_CONTROL);
+
+	/* verify if oscillator is working */
+	osc = __raw_readl(mxc_rng->mem + RNGA_STATUS);
+	if (osc & RNGA_STATUS_OSC_DEAD) {
+		dev_err(mxc_rng->dev, "RNGA Oscillator is dead!\n");
+		return -ENODEV;
+	}
+
+	/* go running */
+	ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL);
+	__raw_writel(ctrl | RNGA_CONTROL_GO, mxc_rng->mem + RNGA_CONTROL);
+
+	return 0;
+}
+
+static void mxc_rnga_cleanup(struct hwrng *rng)
+{
+	u32 ctrl;
+	struct mxc_rng *mxc_rng = container_of(rng, struct mxc_rng, rng);
+
+	ctrl = __raw_readl(mxc_rng->mem + RNGA_CONTROL);
+
+	/* stop rnga */
+	__raw_writel(ctrl & ~RNGA_CONTROL_GO, mxc_rng->mem + RNGA_CONTROL);
+}
+
+static int __init mxc_rnga_probe(struct platform_device *pdev)
+{
+	int err;
+	struct mxc_rng *mxc_rng;
+
+	mxc_rng = devm_kzalloc(&pdev->dev, sizeof(*mxc_rng), GFP_KERNEL);
+	if (!mxc_rng)
+		return -ENOMEM;
+
+	mxc_rng->dev = &pdev->dev;
+	mxc_rng->rng.name = "mxc-rnga";
+	mxc_rng->rng.init = mxc_rnga_init;
+	mxc_rng->rng.cleanup = mxc_rnga_cleanup;
+	mxc_rng->rng.data_present = mxc_rnga_data_present;
+	mxc_rng->rng.data_read = mxc_rnga_data_read;
+
+	mxc_rng->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(mxc_rng->clk)) {
+		dev_err(&pdev->dev, "Could not get rng_clk!\n");
+		return PTR_ERR(mxc_rng->clk);
+	}
+
+	err = clk_prepare_enable(mxc_rng->clk);
+	if (err)
+		return err;
+
+	mxc_rng->mem = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(mxc_rng->mem)) {
+		err = PTR_ERR(mxc_rng->mem);
+		goto err_ioremap;
+	}
+
+	err = hwrng_register(&mxc_rng->rng);
+	if (err) {
+		dev_err(&pdev->dev, "MXC RNGA registering failed (%d)\n", err);
+		goto err_ioremap;
+	}
+
+	return 0;
+
+err_ioremap:
+	clk_disable_unprepare(mxc_rng->clk);
+	return err;
+}
+
+static int __exit mxc_rnga_remove(struct platform_device *pdev)
+{
+	struct mxc_rng *mxc_rng = platform_get_drvdata(pdev);
+
+	hwrng_unregister(&mxc_rng->rng);
+
+	clk_disable_unprepare(mxc_rng->clk);
+
+	return 0;
+}
+
+static const struct of_device_id mxc_rnga_of_match[] = {
+	{ .compatible = "fsl,imx21-rnga", },
+	{ .compatible = "fsl,imx31-rnga", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, mxc_rnga_of_match);
+
+static struct platform_driver mxc_rnga_driver = {
+	.driver = {
+		.name = "mxc_rnga",
+		.of_match_table = mxc_rnga_of_match,
+	},
+	.remove = __exit_p(mxc_rnga_remove),
+};
+
+module_platform_driver_probe(mxc_rnga_driver, mxc_rnga_probe);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("H/W RNGA driver for i.MX");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/n2-asm.S b/drivers/char/hw_random/n2-asm.S
new file mode 100644
index 000000000..c205df43d
--- /dev/null
+++ b/drivers/char/hw_random/n2-asm.S
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* n2-asm.S: Niagara2 RNG hypervisor call assembler.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+#include <linux/linkage.h>
+#include <asm/hypervisor.h>
+#include "n2rng.h"
+
+	.text
+
+ENTRY(sun4v_rng_get_diag_ctl)
+	mov	HV_FAST_RNG_GET_DIAG_CTL, %o5
+	ta	HV_FAST_TRAP
+	retl
+	 nop
+ENDPROC(sun4v_rng_get_diag_ctl)
+
+ENTRY(sun4v_rng_ctl_read_v1)
+	mov	%o1, %o3
+	mov	%o2, %o4
+	mov	HV_FAST_RNG_CTL_READ, %o5
+	ta	HV_FAST_TRAP
+	stx	%o1, [%o3]
+	retl
+	 stx	%o2, [%o4]
+ENDPROC(sun4v_rng_ctl_read_v1)
+
+ENTRY(sun4v_rng_ctl_read_v2)
+	save	%sp, -192, %sp
+	mov	%i0, %o0
+	mov	%i1, %o1
+	mov	HV_FAST_RNG_CTL_READ, %o5
+	ta	HV_FAST_TRAP
+	stx	%o1, [%i2]
+	stx	%o2, [%i3]
+	stx	%o3, [%i4]
+	stx	%o4, [%i5]
+	ret
+	restore	%g0, %o0, %o0
+ENDPROC(sun4v_rng_ctl_read_v2)
+
+ENTRY(sun4v_rng_ctl_write_v1)
+	mov	%o3, %o4
+	mov	HV_FAST_RNG_CTL_WRITE, %o5
+	ta	HV_FAST_TRAP
+	retl
+	 stx	%o1, [%o4]
+ENDPROC(sun4v_rng_ctl_write_v1)
+
+ENTRY(sun4v_rng_ctl_write_v2)
+	mov	HV_FAST_RNG_CTL_WRITE, %o5
+	ta	HV_FAST_TRAP
+	retl
+	 nop
+ENDPROC(sun4v_rng_ctl_write_v2)
+
+ENTRY(sun4v_rng_data_read_diag_v1)
+	mov	%o2, %o4
+	mov	HV_FAST_RNG_DATA_READ_DIAG, %o5
+	ta	HV_FAST_TRAP
+	retl
+	 stx	%o1, [%o4]
+ENDPROC(sun4v_rng_data_read_diag_v1)
+
+ENTRY(sun4v_rng_data_read_diag_v2)
+	mov	%o3, %o4
+	mov	HV_FAST_RNG_DATA_READ_DIAG, %o5
+	ta	HV_FAST_TRAP
+	retl
+	 stx	%o1, [%o4]
+ENDPROC(sun4v_rng_data_read_diag_v2)
+
+ENTRY(sun4v_rng_data_read)
+	mov	%o1, %o4
+	mov	HV_FAST_RNG_DATA_READ, %o5
+	ta	HV_FAST_TRAP
+	retl
+	 stx	%o1, [%o4]
+ENDPROC(sun4v_rng_data_read)
diff --git a/drivers/char/hw_random/n2-drv.c b/drivers/char/hw_random/n2-drv.c
new file mode 100644
index 000000000..73e408146
--- /dev/null
+++ b/drivers/char/hw_random/n2-drv.c
@@ -0,0 +1,870 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* n2-drv.c: Niagara-2 RNG driver.
+ *
+ * Copyright (C) 2008, 2011 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/preempt.h>
+#include <linux/hw_random.h>
+
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <asm/hypervisor.h>
+
+#include "n2rng.h"
+
+#define DRV_MODULE_NAME		"n2rng"
+#define PFX DRV_MODULE_NAME	": "
+#define DRV_MODULE_VERSION	"0.3"
+#define DRV_MODULE_RELDATE	"Jan 7, 2017"
+
+static char version[] =
+	DRV_MODULE_NAME " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
+MODULE_DESCRIPTION("Niagara2 RNG driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+/* The Niagara2 RNG provides a 64-bit read-only random number
+ * register, plus a control register.  Access to the RNG is
+ * virtualized through the hypervisor so that both guests and control
+ * nodes can access the device.
+ *
+ * The entropy source consists of raw entropy sources, each
+ * constructed from a voltage controlled oscillator whose phase is
+ * jittered by thermal noise sources.
+ *
+ * The oscillator in each of the three raw entropy sources run at
+ * different frequencies.  Normally, all three generator outputs are
+ * gathered, xored together, and fed into a CRC circuit, the output of
+ * which is the 64-bit read-only register.
+ *
+ * Some time is necessary for all the necessary entropy to build up
+ * such that a full 64-bits of entropy are available in the register.
+ * In normal operating mode (RNG_CTL_LFSR is set), the chip implements
+ * an interlock which blocks register reads until sufficient entropy
+ * is available.
+ *
+ * A control register is provided for adjusting various aspects of RNG
+ * operation, and to enable diagnostic modes.  Each of the three raw
+ * entropy sources has an enable bit (RNG_CTL_ES{1,2,3}).  Also
+ * provided are fields for controlling the minimum time in cycles
+ * between read accesses to the register (RNG_CTL_WAIT, this controls
+ * the interlock described in the previous paragraph).
+ *
+ * The standard setting is to have the mode bit (RNG_CTL_LFSR) set,
+ * all three entropy sources enabled, and the interlock time set
+ * appropriately.
+ *
+ * The CRC polynomial used by the chip is:
+ *
+ * P(X) = x64 + x61 + x57 + x56 + x52 + x51 + x50 + x48 + x47 + x46 +
+ *        x43 + x42 + x41 + x39 + x38 + x37 + x35 + x32 + x28 + x25 +
+ *        x22 + x21 + x17 + x15 + x13 + x12 + x11 + x7 + x5 + x + 1
+ *
+ * The RNG_CTL_VCO value of each noise cell must be programmed
+ * separately.  This is why 4 control register values must be provided
+ * to the hypervisor.  During a write, the hypervisor writes them all,
+ * one at a time, to the actual RNG_CTL register.  The first three
+ * values are used to setup the desired RNG_CTL_VCO for each entropy
+ * source, for example:
+ *
+ *	control 0: (1 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES1
+ *	control 1: (2 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES2
+ *	control 2: (3 << RNG_CTL_VCO_SHIFT) | RNG_CTL_ES3
+ *
+ * And then the fourth value sets the final chip state and enables
+ * desired.
+ */
+
+static int n2rng_hv_err_trans(unsigned long hv_err)
+{
+	switch (hv_err) {
+	case HV_EOK:
+		return 0;
+	case HV_EWOULDBLOCK:
+		return -EAGAIN;
+	case HV_ENOACCESS:
+		return -EPERM;
+	case HV_EIO:
+		return -EIO;
+	case HV_EBUSY:
+		return -EBUSY;
+	case HV_EBADALIGN:
+	case HV_ENORADDR:
+		return -EFAULT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static unsigned long n2rng_generic_read_control_v2(unsigned long ra,
+						   unsigned long unit)
+{
+	unsigned long hv_err, state, ticks, watchdog_delta, watchdog_status;
+	int block = 0, busy = 0;
+
+	while (1) {
+		hv_err = sun4v_rng_ctl_read_v2(ra, unit, &state,
+					       &ticks,
+					       &watchdog_delta,
+					       &watchdog_status);
+		if (hv_err == HV_EOK)
+			break;
+
+		if (hv_err == HV_EBUSY) {
+			if (++busy >= N2RNG_BUSY_LIMIT)
+				break;
+
+			udelay(1);
+		} else if (hv_err == HV_EWOULDBLOCK) {
+			if (++block >= N2RNG_BLOCK_LIMIT)
+				break;
+
+			__delay(ticks);
+		} else
+			break;
+	}
+
+	return hv_err;
+}
+
+/* In multi-socket situations, the hypervisor might need to
+ * queue up the RNG control register write if it's for a unit
+ * that is on a cpu socket other than the one we are executing on.
+ *
+ * We poll here waiting for a successful read of that control
+ * register to make sure the write has been actually performed.
+ */
+static unsigned long n2rng_control_settle_v2(struct n2rng *np, int unit)
+{
+	unsigned long ra = __pa(&np->scratch_control[0]);
+
+	return n2rng_generic_read_control_v2(ra, unit);
+}
+
+static unsigned long n2rng_write_ctl_one(struct n2rng *np, int unit,
+					 unsigned long state,
+					 unsigned long control_ra,
+					 unsigned long watchdog_timeout,
+					 unsigned long *ticks)
+{
+	unsigned long hv_err;
+
+	if (np->hvapi_major == 1) {
+		hv_err = sun4v_rng_ctl_write_v1(control_ra, state,
+						watchdog_timeout, ticks);
+	} else {
+		hv_err = sun4v_rng_ctl_write_v2(control_ra, state,
+						watchdog_timeout, unit);
+		if (hv_err == HV_EOK)
+			hv_err = n2rng_control_settle_v2(np, unit);
+		*ticks = N2RNG_ACCUM_CYCLES_DEFAULT;
+	}
+
+	return hv_err;
+}
+
+static int n2rng_generic_read_data(unsigned long data_ra)
+{
+	unsigned long ticks, hv_err;
+	int block = 0, hcheck = 0;
+
+	while (1) {
+		hv_err = sun4v_rng_data_read(data_ra, &ticks);
+		if (hv_err == HV_EOK)
+			return 0;
+
+		if (hv_err == HV_EWOULDBLOCK) {
+			if (++block >= N2RNG_BLOCK_LIMIT)
+				return -EWOULDBLOCK;
+			__delay(ticks);
+		} else if (hv_err == HV_ENOACCESS) {
+			return -EPERM;
+		} else if (hv_err == HV_EIO) {
+			if (++hcheck >= N2RNG_HCHECK_LIMIT)
+				return -EIO;
+			udelay(10000);
+		} else
+			return -ENODEV;
+	}
+}
+
+static unsigned long n2rng_read_diag_data_one(struct n2rng *np,
+					      unsigned long unit,
+					      unsigned long data_ra,
+					      unsigned long data_len,
+					      unsigned long *ticks)
+{
+	unsigned long hv_err;
+
+	if (np->hvapi_major == 1) {
+		hv_err = sun4v_rng_data_read_diag_v1(data_ra, data_len, ticks);
+	} else {
+		hv_err = sun4v_rng_data_read_diag_v2(data_ra, data_len,
+						     unit, ticks);
+		if (!*ticks)
+			*ticks = N2RNG_ACCUM_CYCLES_DEFAULT;
+	}
+	return hv_err;
+}
+
+static int n2rng_generic_read_diag_data(struct n2rng *np,
+					unsigned long unit,
+					unsigned long data_ra,
+					unsigned long data_len)
+{
+	unsigned long ticks, hv_err;
+	int block = 0;
+
+	while (1) {
+		hv_err = n2rng_read_diag_data_one(np, unit,
+						  data_ra, data_len,
+						  &ticks);
+		if (hv_err == HV_EOK)
+			return 0;
+
+		if (hv_err == HV_EWOULDBLOCK) {
+			if (++block >= N2RNG_BLOCK_LIMIT)
+				return -EWOULDBLOCK;
+			__delay(ticks);
+		} else if (hv_err == HV_ENOACCESS) {
+			return -EPERM;
+		} else if (hv_err == HV_EIO) {
+			return -EIO;
+		} else
+			return -ENODEV;
+	}
+}
+
+
+static int n2rng_generic_write_control(struct n2rng *np,
+				       unsigned long control_ra,
+				       unsigned long unit,
+				       unsigned long state)
+{
+	unsigned long hv_err, ticks;
+	int block = 0, busy = 0;
+
+	while (1) {
+		hv_err = n2rng_write_ctl_one(np, unit, state, control_ra,
+					     np->wd_timeo, &ticks);
+		if (hv_err == HV_EOK)
+			return 0;
+
+		if (hv_err == HV_EWOULDBLOCK) {
+			if (++block >= N2RNG_BLOCK_LIMIT)
+				return -EWOULDBLOCK;
+			__delay(ticks);
+		} else if (hv_err == HV_EBUSY) {
+			if (++busy >= N2RNG_BUSY_LIMIT)
+				return -EBUSY;
+			udelay(1);
+		} else
+			return -ENODEV;
+	}
+}
+
+/* Just try to see if we can successfully access the control register
+ * of the RNG on the domain on which we are currently executing.
+ */
+static int n2rng_try_read_ctl(struct n2rng *np)
+{
+	unsigned long hv_err;
+	unsigned long x;
+
+	if (np->hvapi_major == 1) {
+		hv_err = sun4v_rng_get_diag_ctl();
+	} else {
+		/* We purposefully give invalid arguments, HV_NOACCESS
+		 * is higher priority than the errors we'd get from
+		 * these other cases, and that's the error we are
+		 * truly interested in.
+		 */
+		hv_err = sun4v_rng_ctl_read_v2(0UL, ~0UL, &x, &x, &x, &x);
+		switch (hv_err) {
+		case HV_EWOULDBLOCK:
+		case HV_ENOACCESS:
+			break;
+		default:
+			hv_err = HV_EOK;
+			break;
+		}
+	}
+
+	return n2rng_hv_err_trans(hv_err);
+}
+
+static u64 n2rng_control_default(struct n2rng *np, int ctl)
+{
+	u64 val = 0;
+
+	if (np->data->chip_version == 1) {
+		val = ((2 << RNG_v1_CTL_ASEL_SHIFT) |
+			(N2RNG_ACCUM_CYCLES_DEFAULT << RNG_v1_CTL_WAIT_SHIFT) |
+			 RNG_CTL_LFSR);
+
+		switch (ctl) {
+		case 0:
+			val |= (1 << RNG_v1_CTL_VCO_SHIFT) | RNG_CTL_ES1;
+			break;
+		case 1:
+			val |= (2 << RNG_v1_CTL_VCO_SHIFT) | RNG_CTL_ES2;
+			break;
+		case 2:
+			val |= (3 << RNG_v1_CTL_VCO_SHIFT) | RNG_CTL_ES3;
+			break;
+		case 3:
+			val |= RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3;
+			break;
+		default:
+			break;
+		}
+
+	} else {
+		val = ((2 << RNG_v2_CTL_ASEL_SHIFT) |
+			(N2RNG_ACCUM_CYCLES_DEFAULT << RNG_v2_CTL_WAIT_SHIFT) |
+			 RNG_CTL_LFSR);
+
+		switch (ctl) {
+		case 0:
+			val |= (1 << RNG_v2_CTL_VCO_SHIFT) | RNG_CTL_ES1;
+			break;
+		case 1:
+			val |= (2 << RNG_v2_CTL_VCO_SHIFT) | RNG_CTL_ES2;
+			break;
+		case 2:
+			val |= (3 << RNG_v2_CTL_VCO_SHIFT) | RNG_CTL_ES3;
+			break;
+		case 3:
+			val |= RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3;
+			break;
+		default:
+			break;
+		}
+	}
+
+	return val;
+}
+
+static void n2rng_control_swstate_init(struct n2rng *np)
+{
+	int i;
+
+	np->flags |= N2RNG_FLAG_CONTROL;
+
+	np->health_check_sec = N2RNG_HEALTH_CHECK_SEC_DEFAULT;
+	np->accum_cycles = N2RNG_ACCUM_CYCLES_DEFAULT;
+	np->wd_timeo = N2RNG_WD_TIMEO_DEFAULT;
+
+	for (i = 0; i < np->num_units; i++) {
+		struct n2rng_unit *up = &np->units[i];
+
+		up->control[0] = n2rng_control_default(np, 0);
+		up->control[1] = n2rng_control_default(np, 1);
+		up->control[2] = n2rng_control_default(np, 2);
+		up->control[3] = n2rng_control_default(np, 3);
+	}
+
+	np->hv_state = HV_RNG_STATE_UNCONFIGURED;
+}
+
+static int n2rng_grab_diag_control(struct n2rng *np)
+{
+	int i, busy_count, err = -ENODEV;
+
+	busy_count = 0;
+	for (i = 0; i < 100; i++) {
+		err = n2rng_try_read_ctl(np);
+		if (err != -EAGAIN)
+			break;
+
+		if (++busy_count > 100) {
+			dev_err(&np->op->dev,
+				"Grab diag control timeout.\n");
+			return -ENODEV;
+		}
+
+		udelay(1);
+	}
+
+	return err;
+}
+
+static int n2rng_init_control(struct n2rng *np)
+{
+	int err = n2rng_grab_diag_control(np);
+
+	/* Not in the control domain, that's OK we are only a consumer
+	 * of the RNG data, we don't setup and program it.
+	 */
+	if (err == -EPERM)
+		return 0;
+	if (err)
+		return err;
+
+	n2rng_control_swstate_init(np);
+
+	return 0;
+}
+
+static int n2rng_data_read(struct hwrng *rng, u32 *data)
+{
+	struct n2rng *np = (struct n2rng *) rng->priv;
+	unsigned long ra = __pa(&np->test_data);
+	int len;
+
+	if (!(np->flags & N2RNG_FLAG_READY)) {
+		len = 0;
+	} else if (np->flags & N2RNG_FLAG_BUFFER_VALID) {
+		np->flags &= ~N2RNG_FLAG_BUFFER_VALID;
+		*data = np->buffer;
+		len = 4;
+	} else {
+		int err = n2rng_generic_read_data(ra);
+		if (!err) {
+			np->flags |= N2RNG_FLAG_BUFFER_VALID;
+			np->buffer = np->test_data >> 32;
+			*data = np->test_data & 0xffffffff;
+			len = 4;
+		} else {
+			dev_err(&np->op->dev, "RNG error, retesting\n");
+			np->flags &= ~N2RNG_FLAG_READY;
+			if (!(np->flags & N2RNG_FLAG_SHUTDOWN))
+				schedule_delayed_work(&np->work, 0);
+			len = 0;
+		}
+	}
+
+	return len;
+}
+
+/* On a guest node, just make sure we can read random data properly.
+ * If a control node reboots or reloads it's n2rng driver, this won't
+ * work during that time.  So we have to keep probing until the device
+ * becomes usable.
+ */
+static int n2rng_guest_check(struct n2rng *np)
+{
+	unsigned long ra = __pa(&np->test_data);
+
+	return n2rng_generic_read_data(ra);
+}
+
+static int n2rng_entropy_diag_read(struct n2rng *np, unsigned long unit,
+				   u64 *pre_control, u64 pre_state,
+				   u64 *buffer, unsigned long buf_len,
+				   u64 *post_control, u64 post_state)
+{
+	unsigned long post_ctl_ra = __pa(post_control);
+	unsigned long pre_ctl_ra = __pa(pre_control);
+	unsigned long buffer_ra = __pa(buffer);
+	int err;
+
+	err = n2rng_generic_write_control(np, pre_ctl_ra, unit, pre_state);
+	if (err)
+		return err;
+
+	err = n2rng_generic_read_diag_data(np, unit,
+					   buffer_ra, buf_len);
+
+	(void) n2rng_generic_write_control(np, post_ctl_ra, unit,
+					   post_state);
+
+	return err;
+}
+
+static u64 advance_polynomial(u64 poly, u64 val, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		int highbit_set = ((s64)val < 0);
+
+		val <<= 1;
+		if (highbit_set)
+			val ^= poly;
+	}
+
+	return val;
+}
+
+static int n2rng_test_buffer_find(struct n2rng *np, u64 val)
+{
+	int i, count = 0;
+
+	/* Purposefully skip over the first word.  */
+	for (i = 1; i < SELFTEST_BUFFER_WORDS; i++) {
+		if (np->test_buffer[i] == val)
+			count++;
+	}
+	return count;
+}
+
+static void n2rng_dump_test_buffer(struct n2rng *np)
+{
+	int i;
+
+	for (i = 0; i < SELFTEST_BUFFER_WORDS; i++)
+		dev_err(&np->op->dev, "Test buffer slot %d [0x%016llx]\n",
+			i, np->test_buffer[i]);
+}
+
+static int n2rng_check_selftest_buffer(struct n2rng *np, unsigned long unit)
+{
+	u64 val;
+	int err, matches, limit;
+
+	switch (np->data->id) {
+	case N2_n2_rng:
+	case N2_vf_rng:
+	case N2_kt_rng:
+	case N2_m4_rng:  /* yes, m4 uses the old value */
+		val = RNG_v1_SELFTEST_VAL;
+		break;
+	default:
+		val = RNG_v2_SELFTEST_VAL;
+		break;
+	}
+
+	matches = 0;
+	for (limit = 0; limit < SELFTEST_LOOPS_MAX; limit++) {
+		matches += n2rng_test_buffer_find(np, val);
+		if (matches >= SELFTEST_MATCH_GOAL)
+			break;
+		val = advance_polynomial(SELFTEST_POLY, val, 1);
+	}
+
+	err = 0;
+	if (limit >= SELFTEST_LOOPS_MAX) {
+		err = -ENODEV;
+		dev_err(&np->op->dev, "Selftest failed on unit %lu\n", unit);
+		n2rng_dump_test_buffer(np);
+	} else
+		dev_info(&np->op->dev, "Selftest passed on unit %lu\n", unit);
+
+	return err;
+}
+
+static int n2rng_control_selftest(struct n2rng *np, unsigned long unit)
+{
+	int err;
+	u64 base, base3;
+
+	switch (np->data->id) {
+	case N2_n2_rng:
+	case N2_vf_rng:
+	case N2_kt_rng:
+		base = RNG_v1_CTL_ASEL_NOOUT << RNG_v1_CTL_ASEL_SHIFT;
+		base3 = base | RNG_CTL_LFSR |
+			((RNG_v1_SELFTEST_TICKS - 2) << RNG_v1_CTL_WAIT_SHIFT);
+		break;
+	case N2_m4_rng:
+		base = RNG_v2_CTL_ASEL_NOOUT << RNG_v2_CTL_ASEL_SHIFT;
+		base3 = base | RNG_CTL_LFSR |
+			((RNG_v1_SELFTEST_TICKS - 2) << RNG_v2_CTL_WAIT_SHIFT);
+		break;
+	default:
+		base = RNG_v2_CTL_ASEL_NOOUT << RNG_v2_CTL_ASEL_SHIFT;
+		base3 = base | RNG_CTL_LFSR |
+			(RNG_v2_SELFTEST_TICKS << RNG_v2_CTL_WAIT_SHIFT);
+		break;
+	}
+
+	np->test_control[0] = base;
+	np->test_control[1] = base;
+	np->test_control[2] = base;
+	np->test_control[3] = base3;
+
+	err = n2rng_entropy_diag_read(np, unit, np->test_control,
+				      HV_RNG_STATE_HEALTHCHECK,
+				      np->test_buffer,
+				      sizeof(np->test_buffer),
+				      &np->units[unit].control[0],
+				      np->hv_state);
+	if (err)
+		return err;
+
+	return n2rng_check_selftest_buffer(np, unit);
+}
+
+static int n2rng_control_check(struct n2rng *np)
+{
+	int i;
+
+	for (i = 0; i < np->num_units; i++) {
+		int err = n2rng_control_selftest(np, i);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
+/* The sanity checks passed, install the final configuration into the
+ * chip, it's ready to use.
+ */
+static int n2rng_control_configure_units(struct n2rng *np)
+{
+	int unit, err;
+
+	err = 0;
+	for (unit = 0; unit < np->num_units; unit++) {
+		struct n2rng_unit *up = &np->units[unit];
+		unsigned long ctl_ra = __pa(&up->control[0]);
+		int esrc;
+		u64 base, shift;
+
+		if (np->data->chip_version == 1) {
+			base = ((np->accum_cycles << RNG_v1_CTL_WAIT_SHIFT) |
+			      (RNG_v1_CTL_ASEL_NOOUT << RNG_v1_CTL_ASEL_SHIFT) |
+			      RNG_CTL_LFSR);
+			shift = RNG_v1_CTL_VCO_SHIFT;
+		} else {
+			base = ((np->accum_cycles << RNG_v2_CTL_WAIT_SHIFT) |
+			      (RNG_v2_CTL_ASEL_NOOUT << RNG_v2_CTL_ASEL_SHIFT) |
+			      RNG_CTL_LFSR);
+			shift = RNG_v2_CTL_VCO_SHIFT;
+		}
+
+		/* XXX This isn't the best.  We should fetch a bunch
+		 * XXX of words using each entropy source combined XXX
+		 * with each VCO setting, and see which combinations
+		 * XXX give the best random data.
+		 */
+		for (esrc = 0; esrc < 3; esrc++)
+			up->control[esrc] = base |
+				(esrc << shift) |
+				(RNG_CTL_ES1 << esrc);
+
+		up->control[3] = base |
+			(RNG_CTL_ES1 | RNG_CTL_ES2 | RNG_CTL_ES3);
+
+		err = n2rng_generic_write_control(np, ctl_ra, unit,
+						  HV_RNG_STATE_CONFIGURED);
+		if (err)
+			break;
+	}
+
+	return err;
+}
+
+static void n2rng_work(struct work_struct *work)
+{
+	struct n2rng *np = container_of(work, struct n2rng, work.work);
+	int err = 0;
+	static int retries = 4;
+
+	if (!(np->flags & N2RNG_FLAG_CONTROL)) {
+		err = n2rng_guest_check(np);
+	} else {
+		preempt_disable();
+		err = n2rng_control_check(np);
+		preempt_enable();
+
+		if (!err)
+			err = n2rng_control_configure_units(np);
+	}
+
+	if (!err) {
+		np->flags |= N2RNG_FLAG_READY;
+		dev_info(&np->op->dev, "RNG ready\n");
+	}
+
+	if (--retries == 0)
+		dev_err(&np->op->dev, "Self-test retries failed, RNG not ready\n");
+	else if (err && !(np->flags & N2RNG_FLAG_SHUTDOWN))
+		schedule_delayed_work(&np->work, HZ * 2);
+}
+
+static void n2rng_driver_version(void)
+{
+	static int n2rng_version_printed;
+
+	if (n2rng_version_printed++ == 0)
+		pr_info("%s", version);
+}
+
+static const struct of_device_id n2rng_match[];
+static int n2rng_probe(struct platform_device *op)
+{
+	const struct of_device_id *match;
+	int err = -ENOMEM;
+	struct n2rng *np;
+
+	match = of_match_device(n2rng_match, &op->dev);
+	if (!match)
+		return -EINVAL;
+
+	n2rng_driver_version();
+	np = devm_kzalloc(&op->dev, sizeof(*np), GFP_KERNEL);
+	if (!np)
+		goto out;
+	np->op = op;
+	np->data = (struct n2rng_template *)match->data;
+
+	INIT_DELAYED_WORK(&np->work, n2rng_work);
+
+	if (np->data->multi_capable)
+		np->flags |= N2RNG_FLAG_MULTI;
+
+	err = -ENODEV;
+	np->hvapi_major = 2;
+	if (sun4v_hvapi_register(HV_GRP_RNG,
+				 np->hvapi_major,
+				 &np->hvapi_minor)) {
+		np->hvapi_major = 1;
+		if (sun4v_hvapi_register(HV_GRP_RNG,
+					 np->hvapi_major,
+					 &np->hvapi_minor)) {
+			dev_err(&op->dev, "Cannot register suitable "
+				"HVAPI version.\n");
+			goto out;
+		}
+	}
+
+	if (np->flags & N2RNG_FLAG_MULTI) {
+		if (np->hvapi_major < 2) {
+			dev_err(&op->dev, "multi-unit-capable RNG requires "
+				"HVAPI major version 2 or later, got %lu\n",
+				np->hvapi_major);
+			goto out_hvapi_unregister;
+		}
+		np->num_units = of_getintprop_default(op->dev.of_node,
+						      "rng-#units", 0);
+		if (!np->num_units) {
+			dev_err(&op->dev, "VF RNG lacks rng-#units property\n");
+			goto out_hvapi_unregister;
+		}
+	} else {
+		np->num_units = 1;
+	}
+
+	dev_info(&op->dev, "Registered RNG HVAPI major %lu minor %lu\n",
+		 np->hvapi_major, np->hvapi_minor);
+	np->units = devm_kcalloc(&op->dev, np->num_units, sizeof(*np->units),
+				 GFP_KERNEL);
+	err = -ENOMEM;
+	if (!np->units)
+		goto out_hvapi_unregister;
+
+	err = n2rng_init_control(np);
+	if (err)
+		goto out_hvapi_unregister;
+
+	dev_info(&op->dev, "Found %s RNG, units: %d\n",
+		 ((np->flags & N2RNG_FLAG_MULTI) ?
+		  "multi-unit-capable" : "single-unit"),
+		 np->num_units);
+
+	np->hwrng.name = DRV_MODULE_NAME;
+	np->hwrng.data_read = n2rng_data_read;
+	np->hwrng.priv = (unsigned long) np;
+
+	err = devm_hwrng_register(&op->dev, &np->hwrng);
+	if (err)
+		goto out_hvapi_unregister;
+
+	platform_set_drvdata(op, np);
+
+	schedule_delayed_work(&np->work, 0);
+
+	return 0;
+
+out_hvapi_unregister:
+	sun4v_hvapi_unregister(HV_GRP_RNG);
+
+out:
+	return err;
+}
+
+static int n2rng_remove(struct platform_device *op)
+{
+	struct n2rng *np = platform_get_drvdata(op);
+
+	np->flags |= N2RNG_FLAG_SHUTDOWN;
+
+	cancel_delayed_work_sync(&np->work);
+
+	sun4v_hvapi_unregister(HV_GRP_RNG);
+
+	return 0;
+}
+
+static struct n2rng_template n2_template = {
+	.id = N2_n2_rng,
+	.multi_capable = 0,
+	.chip_version = 1,
+};
+
+static struct n2rng_template vf_template = {
+	.id = N2_vf_rng,
+	.multi_capable = 1,
+	.chip_version = 1,
+};
+
+static struct n2rng_template kt_template = {
+	.id = N2_kt_rng,
+	.multi_capable = 1,
+	.chip_version = 1,
+};
+
+static struct n2rng_template m4_template = {
+	.id = N2_m4_rng,
+	.multi_capable = 1,
+	.chip_version = 2,
+};
+
+static struct n2rng_template m7_template = {
+	.id = N2_m7_rng,
+	.multi_capable = 1,
+	.chip_version = 2,
+};
+
+static const struct of_device_id n2rng_match[] = {
+	{
+		.name		= "random-number-generator",
+		.compatible	= "SUNW,n2-rng",
+		.data		= &n2_template,
+	},
+	{
+		.name		= "random-number-generator",
+		.compatible	= "SUNW,vf-rng",
+		.data		= &vf_template,
+	},
+	{
+		.name		= "random-number-generator",
+		.compatible	= "SUNW,kt-rng",
+		.data		= &kt_template,
+	},
+	{
+		.name		= "random-number-generator",
+		.compatible	= "ORCL,m4-rng",
+		.data		= &m4_template,
+	},
+	{
+		.name		= "random-number-generator",
+		.compatible	= "ORCL,m7-rng",
+		.data		= &m7_template,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, n2rng_match);
+
+static struct platform_driver n2rng_driver = {
+	.driver = {
+		.name = "n2rng",
+		.of_match_table = n2rng_match,
+	},
+	.probe		= n2rng_probe,
+	.remove		= n2rng_remove,
+};
+
+module_platform_driver(n2rng_driver);
diff --git a/drivers/char/hw_random/n2rng.h b/drivers/char/hw_random/n2rng.h
new file mode 100644
index 000000000..9a870f5dc
--- /dev/null
+++ b/drivers/char/hw_random/n2rng.h
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* n2rng.h: Niagara2 RNG defines.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#ifndef _N2RNG_H
+#define _N2RNG_H
+
+/* ver1 devices - n2-rng, vf-rng, kt-rng */
+#define RNG_v1_CTL_WAIT       0x0000000001fffe00ULL /* Minimum wait time    */
+#define RNG_v1_CTL_WAIT_SHIFT 9
+#define RNG_v1_CTL_BYPASS     0x0000000000000100ULL /* VCO voltage source   */
+#define RNG_v1_CTL_VCO        0x00000000000000c0ULL /* VCO rate control     */
+#define RNG_v1_CTL_VCO_SHIFT  6
+#define RNG_v1_CTL_ASEL       0x0000000000000030ULL /* Analog MUX select    */
+#define RNG_v1_CTL_ASEL_SHIFT 4
+#define RNG_v1_CTL_ASEL_NOOUT 2
+
+/* these are the same in v2 as in v1 */
+#define RNG_CTL_LFSR       0x0000000000000008ULL /* Use LFSR or plain shift */
+#define RNG_CTL_ES3        0x0000000000000004ULL /* Enable entropy source 3 */
+#define RNG_CTL_ES2        0x0000000000000002ULL /* Enable entropy source 2 */
+#define RNG_CTL_ES1        0x0000000000000001ULL /* Enable entropy source 1 */
+
+/* ver2 devices - m4-rng, m7-rng */
+#define RNG_v2_CTL_WAIT       0x0000000007fff800ULL /* Minimum wait time    */
+#define RNG_v2_CTL_WAIT_SHIFT 12
+#define RNG_v2_CTL_BYPASS     0x0000000000000400ULL /* VCO voltage source   */
+#define RNG_v2_CTL_VCO        0x0000000000000300ULL /* VCO rate control     */
+#define RNG_v2_CTL_VCO_SHIFT  9
+#define RNG_v2_CTL_PERF       0x0000000000000180ULL /* Perf */
+#define RNG_v2_CTL_ASEL       0x0000000000000070ULL /* Analog MUX select    */
+#define RNG_v2_CTL_ASEL_SHIFT 4
+#define RNG_v2_CTL_ASEL_NOOUT 7
+
+
+#define HV_FAST_RNG_GET_DIAG_CTL	0x130
+#define HV_FAST_RNG_CTL_READ		0x131
+#define HV_FAST_RNG_CTL_WRITE		0x132
+#define HV_FAST_RNG_DATA_READ_DIAG	0x133
+#define HV_FAST_RNG_DATA_READ		0x134
+
+#define HV_RNG_STATE_UNCONFIGURED	0
+#define HV_RNG_STATE_CONFIGURED		1
+#define HV_RNG_STATE_HEALTHCHECK	2
+#define HV_RNG_STATE_ERROR		3
+
+#define HV_RNG_NUM_CONTROL		4
+
+#ifndef __ASSEMBLY__
+extern unsigned long sun4v_rng_get_diag_ctl(void);
+extern unsigned long sun4v_rng_ctl_read_v1(unsigned long ctl_regs_ra,
+					   unsigned long *state,
+					   unsigned long *tick_delta);
+extern unsigned long sun4v_rng_ctl_read_v2(unsigned long ctl_regs_ra,
+					   unsigned long unit,
+					   unsigned long *state,
+					   unsigned long *tick_delta,
+					   unsigned long *watchdog,
+					   unsigned long *write_status);
+extern unsigned long sun4v_rng_ctl_write_v1(unsigned long ctl_regs_ra,
+					    unsigned long state,
+					    unsigned long write_timeout,
+					    unsigned long *tick_delta);
+extern unsigned long sun4v_rng_ctl_write_v2(unsigned long ctl_regs_ra,
+					    unsigned long state,
+					    unsigned long write_timeout,
+					    unsigned long unit);
+extern unsigned long sun4v_rng_data_read_diag_v1(unsigned long data_ra,
+						 unsigned long len,
+						 unsigned long *tick_delta);
+extern unsigned long sun4v_rng_data_read_diag_v2(unsigned long data_ra,
+						 unsigned long len,
+						 unsigned long unit,
+						 unsigned long *tick_delta);
+extern unsigned long sun4v_rng_data_read(unsigned long data_ra,
+					 unsigned long *tick_delta);
+
+enum n2rng_compat_id {
+	N2_n2_rng,
+	N2_vf_rng,
+	N2_kt_rng,
+	N2_m4_rng,
+	N2_m7_rng,
+};
+
+struct n2rng_template {
+	enum n2rng_compat_id id;
+	int multi_capable;
+	int chip_version;
+};
+
+struct n2rng_unit {
+	u64			control[HV_RNG_NUM_CONTROL];
+};
+
+struct n2rng {
+	struct platform_device	*op;
+
+	unsigned long		flags;
+#define N2RNG_FLAG_MULTI	0x00000001 /* Multi-unit capable RNG */
+#define N2RNG_FLAG_CONTROL	0x00000002 /* Operating in control domain */
+#define N2RNG_FLAG_READY	0x00000008 /* Ready for hw-rng layer      */
+#define N2RNG_FLAG_SHUTDOWN	0x00000010 /* Driver unregistering        */
+#define N2RNG_FLAG_BUFFER_VALID	0x00000020 /* u32 buffer holds valid data */
+
+	struct n2rng_template	*data;
+	int			num_units;
+	struct n2rng_unit	*units;
+
+	struct hwrng		hwrng;
+	u32			buffer;
+
+	/* Registered hypervisor group API major and minor version.  */
+	unsigned long		hvapi_major;
+	unsigned long		hvapi_minor;
+
+	struct delayed_work	work;
+
+	unsigned long		hv_state; /* HV_RNG_STATE_foo */
+
+	unsigned long		health_check_sec;
+	unsigned long		accum_cycles;
+	unsigned long		wd_timeo;
+#define N2RNG_HEALTH_CHECK_SEC_DEFAULT	0
+#define N2RNG_ACCUM_CYCLES_DEFAULT	2048
+#define N2RNG_WD_TIMEO_DEFAULT		0
+
+	u64			scratch_control[HV_RNG_NUM_CONTROL];
+
+#define RNG_v1_SELFTEST_TICKS	38859
+#define RNG_v1_SELFTEST_VAL	((u64)0xB8820C7BD387E32C)
+#define RNG_v2_SELFTEST_TICKS	64
+#define RNG_v2_SELFTEST_VAL	((u64)0xffffffffffffffff)
+#define SELFTEST_POLY		((u64)0x231DCEE91262B8A3)
+#define SELFTEST_MATCH_GOAL	6
+#define SELFTEST_LOOPS_MAX	40000
+#define SELFTEST_BUFFER_WORDS	8
+
+	u64			test_data;
+	u64			test_control[HV_RNG_NUM_CONTROL];
+	u64			test_buffer[SELFTEST_BUFFER_WORDS];
+};
+
+#define N2RNG_BLOCK_LIMIT	60000
+#define N2RNG_BUSY_LIMIT	100
+#define N2RNG_HCHECK_LIMIT	100
+
+#endif /* !(__ASSEMBLY__) */
+
+#endif /* _N2RNG_H */
diff --git a/drivers/char/hw_random/nomadik-rng.c b/drivers/char/hw_random/nomadik-rng.c
new file mode 100644
index 000000000..3774adf90
--- /dev/null
+++ b/drivers/char/hw_random/nomadik-rng.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Nomadik RNG support
+ *  Copyright 2009 Alessandro Rubini
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+static int nmk_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	void __iomem *base = (void __iomem *)rng->priv;
+
+	/*
+	 * The register is 32 bits and gives 16 random bits (low half).
+	 * A subsequent read will delay the core for 400ns, so we just read
+	 * once and accept the very unlikely very small delay, even if wait==0.
+	 */
+	*(u16 *)data = __raw_readl(base + 8) & 0xffff;
+	return 2;
+}
+
+/* we have at most one RNG per machine, granted */
+static struct hwrng nmk_rng = {
+	.name		= "nomadik",
+	.read		= nmk_rng_read,
+};
+
+static int nmk_rng_probe(struct amba_device *dev, const struct amba_id *id)
+{
+	struct clk *rng_clk;
+	void __iomem *base;
+	int ret;
+
+	rng_clk = devm_clk_get_enabled(&dev->dev, NULL);
+	if (IS_ERR(rng_clk)) {
+		dev_err(&dev->dev, "could not get rng clock\n");
+		ret = PTR_ERR(rng_clk);
+		return ret;
+	}
+
+	ret = amba_request_regions(dev, dev->dev.init_name);
+	if (ret)
+		return ret;
+	ret = -ENOMEM;
+	base = devm_ioremap(&dev->dev, dev->res.start,
+			    resource_size(&dev->res));
+	if (!base)
+		goto out_release;
+	nmk_rng.priv = (unsigned long)base;
+	ret = devm_hwrng_register(&dev->dev, &nmk_rng);
+	if (ret)
+		goto out_release;
+	return 0;
+
+out_release:
+	amba_release_regions(dev);
+	return ret;
+}
+
+static void nmk_rng_remove(struct amba_device *dev)
+{
+	amba_release_regions(dev);
+}
+
+static const struct amba_id nmk_rng_ids[] = {
+	{
+		.id	= 0x000805e1,
+		.mask	= 0x000fffff, /* top bits are rev and cfg: accept all */
+	},
+	{0, 0},
+};
+
+MODULE_DEVICE_TABLE(amba, nmk_rng_ids);
+
+static struct amba_driver nmk_rng_driver = {
+	.drv = {
+		.owner = THIS_MODULE,
+		.name = "rng",
+		},
+	.probe = nmk_rng_probe,
+	.remove = nmk_rng_remove,
+	.id_table = nmk_rng_ids,
+};
+
+module_amba_driver(nmk_rng_driver);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/npcm-rng.c b/drivers/char/hw_random/npcm-rng.c
new file mode 100644
index 000000000..1ec5f267a
--- /dev/null
+++ b/drivers/char/hw_random/npcm-rng.c
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Nuvoton Technology corporation.
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/init.h>
+#include <linux/random.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/hw_random.h>
+#include <linux/delay.h>
+#include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
+
+#define NPCM_RNGCS_REG		0x00	/* Control and status register */
+#define NPCM_RNGD_REG		0x04	/* Data register */
+#define NPCM_RNGMODE_REG	0x08	/* Mode register */
+
+#define NPCM_RNG_CLK_SET_25MHZ	GENMASK(4, 3) /* 20-25 MHz */
+#define NPCM_RNG_DATA_VALID	BIT(1)
+#define NPCM_RNG_ENABLE		BIT(0)
+#define NPCM_RNG_M1ROSEL	BIT(1)
+
+#define NPCM_RNG_TIMEOUT_USEC	20000
+#define NPCM_RNG_POLL_USEC	1000
+
+#define to_npcm_rng(p)	container_of(p, struct npcm_rng, rng)
+
+struct npcm_rng {
+	void __iomem *base;
+	struct hwrng rng;
+};
+
+static int npcm_rng_init(struct hwrng *rng)
+{
+	struct npcm_rng *priv = to_npcm_rng(rng);
+
+	writel(NPCM_RNG_CLK_SET_25MHZ | NPCM_RNG_ENABLE,
+	       priv->base + NPCM_RNGCS_REG);
+
+	return 0;
+}
+
+static void npcm_rng_cleanup(struct hwrng *rng)
+{
+	struct npcm_rng *priv = to_npcm_rng(rng);
+
+	writel(NPCM_RNG_CLK_SET_25MHZ, priv->base + NPCM_RNGCS_REG);
+}
+
+static int npcm_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct npcm_rng *priv = to_npcm_rng(rng);
+	int retval = 0;
+	int ready;
+
+	pm_runtime_get_sync((struct device *)priv->rng.priv);
+
+	while (max) {
+		if (wait) {
+			if (readb_poll_timeout(priv->base + NPCM_RNGCS_REG,
+					       ready,
+					       ready & NPCM_RNG_DATA_VALID,
+					       NPCM_RNG_POLL_USEC,
+					       NPCM_RNG_TIMEOUT_USEC))
+				break;
+		} else {
+			if ((readb(priv->base + NPCM_RNGCS_REG) &
+			    NPCM_RNG_DATA_VALID) == 0)
+				break;
+		}
+
+		*(u8 *)buf = readb(priv->base + NPCM_RNGD_REG);
+		retval++;
+		buf++;
+		max--;
+	}
+
+	pm_runtime_mark_last_busy((struct device *)priv->rng.priv);
+	pm_runtime_put_sync_autosuspend((struct device *)priv->rng.priv);
+
+	return retval || !wait ? retval : -EIO;
+}
+
+static int npcm_rng_probe(struct platform_device *pdev)
+{
+	struct npcm_rng *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	dev_set_drvdata(&pdev->dev, priv);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+#ifndef CONFIG_PM
+	priv->rng.init = npcm_rng_init;
+	priv->rng.cleanup = npcm_rng_cleanup;
+#endif
+	priv->rng.name = pdev->name;
+	priv->rng.read = npcm_rng_read;
+	priv->rng.priv = (unsigned long)&pdev->dev;
+	priv->rng.quality = 1000;
+
+	writel(NPCM_RNG_M1ROSEL, priv->base + NPCM_RNGMODE_REG);
+
+	ret = devm_hwrng_register(&pdev->dev, &priv->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register rng device: %d\n",
+			ret);
+		pm_runtime_disable(&pdev->dev);
+		pm_runtime_set_suspended(&pdev->dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int npcm_rng_remove(struct platform_device *pdev)
+{
+	struct npcm_rng *priv = platform_get_drvdata(pdev);
+
+	devm_hwrng_unregister(&pdev->dev, &priv->rng);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int npcm_rng_runtime_suspend(struct device *dev)
+{
+	struct npcm_rng *priv = dev_get_drvdata(dev);
+
+	npcm_rng_cleanup(&priv->rng);
+
+	return 0;
+}
+
+static int npcm_rng_runtime_resume(struct device *dev)
+{
+	struct npcm_rng *priv = dev_get_drvdata(dev);
+
+	return npcm_rng_init(&priv->rng);
+}
+#endif
+
+static const struct dev_pm_ops npcm_rng_pm_ops = {
+	SET_RUNTIME_PM_OPS(npcm_rng_runtime_suspend,
+			   npcm_rng_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
+static const struct of_device_id rng_dt_id[] __maybe_unused = {
+	{ .compatible = "nuvoton,npcm750-rng",  },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rng_dt_id);
+
+static struct platform_driver npcm_rng_driver = {
+	.driver = {
+		.name		= "npcm-rng",
+		.pm		= &npcm_rng_pm_ops,
+		.of_match_table = of_match_ptr(rng_dt_id),
+	},
+	.probe		= npcm_rng_probe,
+	.remove		= npcm_rng_remove,
+};
+
+module_platform_driver(npcm_rng_driver);
+
+MODULE_DESCRIPTION("Nuvoton NPCM Random Number Generator Driver");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/octeon-rng.c b/drivers/char/hw_random/octeon-rng.c
new file mode 100644
index 000000000..8561a09b4
--- /dev/null
+++ b/drivers/char/hw_random/octeon-rng.c
@@ -0,0 +1,118 @@
+/*
+ * Hardware Random Number Generator support for Cavium Networks
+ * Octeon processor family.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Cavium Networks
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/gfp.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-rnm-defs.h>
+
+struct octeon_rng {
+	struct hwrng ops;
+	void __iomem *control_status;
+	void __iomem *result;
+};
+
+static int octeon_rng_init(struct hwrng *rng)
+{
+	union cvmx_rnm_ctl_status ctl;
+	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
+
+	ctl.u64 = 0;
+	ctl.s.ent_en = 1; /* Enable the entropy source.  */
+	ctl.s.rng_en = 1; /* Enable the RNG hardware.  */
+	cvmx_write_csr((__force u64)p->control_status, ctl.u64);
+	return 0;
+}
+
+static void octeon_rng_cleanup(struct hwrng *rng)
+{
+	union cvmx_rnm_ctl_status ctl;
+	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
+
+	ctl.u64 = 0;
+	/* Disable everything.  */
+	cvmx_write_csr((__force u64)p->control_status, ctl.u64);
+}
+
+static int octeon_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
+
+	*data = cvmx_read64_uint32((__force u64)p->result);
+	return sizeof(u32);
+}
+
+static int octeon_rng_probe(struct platform_device *pdev)
+{
+	struct resource *res_ports;
+	struct resource *res_result;
+	struct octeon_rng *rng;
+	int ret;
+	struct hwrng ops = {
+		.name = "octeon",
+		.init = octeon_rng_init,
+		.cleanup = octeon_rng_cleanup,
+		.data_read = octeon_rng_data_read
+	};
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_ports)
+		return -ENOENT;
+
+	res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res_result)
+		return -ENOENT;
+
+
+	rng->control_status = devm_ioremap(&pdev->dev,
+						   res_ports->start,
+						   sizeof(u64));
+	if (!rng->control_status)
+		return -ENOENT;
+
+	rng->result = devm_ioremap(&pdev->dev,
+					   res_result->start,
+					   sizeof(u64));
+	if (!rng->result)
+		return -ENOENT;
+
+	rng->ops = ops;
+
+	platform_set_drvdata(pdev, &rng->ops);
+	ret = devm_hwrng_register(&pdev->dev, &rng->ops);
+	if (ret)
+		return -ENOENT;
+
+	dev_info(&pdev->dev, "Octeon Random Number Generator\n");
+
+	return 0;
+}
+
+static struct platform_driver octeon_rng_driver = {
+	.driver = {
+		.name		= "octeon_rng",
+	},
+	.probe		= octeon_rng_probe,
+};
+
+module_platform_driver(octeon_rng_driver);
+
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
new file mode 100644
index 000000000..00ff96703
--- /dev/null
+++ b/drivers/char/hw_random/omap-rng.c
@@ -0,0 +1,571 @@
+/*
+ * omap-rng.c - RNG driver for TI OMAP CPU family
+ *
+ * Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * Mostly based on original driver:
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/random.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/hw_random.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#define RNG_REG_STATUS_RDY			(1 << 0)
+
+#define RNG_REG_INTACK_RDY_MASK			(1 << 0)
+#define RNG_REG_INTACK_SHUTDOWN_OFLO_MASK	(1 << 1)
+#define RNG_SHUTDOWN_OFLO_MASK			(1 << 1)
+
+#define RNG_CONTROL_STARTUP_CYCLES_SHIFT	16
+#define RNG_CONTROL_STARTUP_CYCLES_MASK		(0xffff << 16)
+#define RNG_CONTROL_ENABLE_TRNG_SHIFT		10
+#define RNG_CONTROL_ENABLE_TRNG_MASK		(1 << 10)
+
+#define RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT	16
+#define RNG_CONFIG_MAX_REFIL_CYCLES_MASK	(0xffff << 16)
+#define RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT	0
+#define RNG_CONFIG_MIN_REFIL_CYCLES_MASK	(0xff << 0)
+
+#define RNG_CONTROL_STARTUP_CYCLES		0xff
+#define RNG_CONFIG_MIN_REFIL_CYCLES		0x21
+#define RNG_CONFIG_MAX_REFIL_CYCLES		0x22
+
+#define RNG_ALARMCNT_ALARM_TH_SHIFT		0x0
+#define RNG_ALARMCNT_ALARM_TH_MASK		(0xff << 0)
+#define RNG_ALARMCNT_SHUTDOWN_TH_SHIFT		16
+#define RNG_ALARMCNT_SHUTDOWN_TH_MASK		(0x1f << 16)
+#define RNG_ALARM_THRESHOLD			0xff
+#define RNG_SHUTDOWN_THRESHOLD			0x4
+
+#define RNG_REG_FROENABLE_MASK			0xffffff
+#define RNG_REG_FRODETUNE_MASK			0xffffff
+
+#define OMAP2_RNG_OUTPUT_SIZE			0x4
+#define OMAP4_RNG_OUTPUT_SIZE			0x8
+#define EIP76_RNG_OUTPUT_SIZE			0x10
+
+/*
+ * EIP76 RNG takes approx. 700us to produce 16 bytes of output data
+ * as per testing results. And to account for the lack of udelay()'s
+ * reliability, we keep the timeout as 1000us.
+ */
+#define RNG_DATA_FILL_TIMEOUT			100
+
+enum {
+	RNG_OUTPUT_0_REG = 0,
+	RNG_OUTPUT_1_REG,
+	RNG_OUTPUT_2_REG,
+	RNG_OUTPUT_3_REG,
+	RNG_STATUS_REG,
+	RNG_INTMASK_REG,
+	RNG_INTACK_REG,
+	RNG_CONTROL_REG,
+	RNG_CONFIG_REG,
+	RNG_ALARMCNT_REG,
+	RNG_FROENABLE_REG,
+	RNG_FRODETUNE_REG,
+	RNG_ALARMMASK_REG,
+	RNG_ALARMSTOP_REG,
+	RNG_REV_REG,
+	RNG_SYSCONFIG_REG,
+};
+
+static const u16 reg_map_omap2[] = {
+	[RNG_OUTPUT_0_REG]	= 0x0,
+	[RNG_STATUS_REG]	= 0x4,
+	[RNG_CONFIG_REG]	= 0x28,
+	[RNG_REV_REG]		= 0x3c,
+	[RNG_SYSCONFIG_REG]	= 0x40,
+};
+
+static const u16 reg_map_omap4[] = {
+	[RNG_OUTPUT_0_REG]	= 0x0,
+	[RNG_OUTPUT_1_REG]	= 0x4,
+	[RNG_STATUS_REG]	= 0x8,
+	[RNG_INTMASK_REG]	= 0xc,
+	[RNG_INTACK_REG]	= 0x10,
+	[RNG_CONTROL_REG]	= 0x14,
+	[RNG_CONFIG_REG]	= 0x18,
+	[RNG_ALARMCNT_REG]	= 0x1c,
+	[RNG_FROENABLE_REG]	= 0x20,
+	[RNG_FRODETUNE_REG]	= 0x24,
+	[RNG_ALARMMASK_REG]	= 0x28,
+	[RNG_ALARMSTOP_REG]	= 0x2c,
+	[RNG_REV_REG]		= 0x1FE0,
+	[RNG_SYSCONFIG_REG]	= 0x1FE4,
+};
+
+static const u16 reg_map_eip76[] = {
+	[RNG_OUTPUT_0_REG]	= 0x0,
+	[RNG_OUTPUT_1_REG]	= 0x4,
+	[RNG_OUTPUT_2_REG]	= 0x8,
+	[RNG_OUTPUT_3_REG]	= 0xc,
+	[RNG_STATUS_REG]	= 0x10,
+	[RNG_INTACK_REG]	= 0x10,
+	[RNG_CONTROL_REG]	= 0x14,
+	[RNG_CONFIG_REG]	= 0x18,
+	[RNG_ALARMCNT_REG]	= 0x1c,
+	[RNG_FROENABLE_REG]	= 0x20,
+	[RNG_FRODETUNE_REG]	= 0x24,
+	[RNG_ALARMMASK_REG]	= 0x28,
+	[RNG_ALARMSTOP_REG]	= 0x2c,
+	[RNG_REV_REG]		= 0x7c,
+};
+
+struct omap_rng_dev;
+/**
+ * struct omap_rng_pdata - RNG IP block-specific data
+ * @regs: Pointer to the register offsets structure.
+ * @data_size: No. of bytes in RNG output.
+ * @data_present: Callback to determine if data is available.
+ * @init: Callback for IP specific initialization sequence.
+ * @cleanup: Callback for IP specific cleanup sequence.
+ */
+struct omap_rng_pdata {
+	u16	*regs;
+	u32	data_size;
+	u32	(*data_present)(struct omap_rng_dev *priv);
+	int	(*init)(struct omap_rng_dev *priv);
+	void	(*cleanup)(struct omap_rng_dev *priv);
+};
+
+struct omap_rng_dev {
+	void __iomem			*base;
+	struct device			*dev;
+	const struct omap_rng_pdata	*pdata;
+	struct hwrng rng;
+	struct clk 			*clk;
+	struct clk			*clk_reg;
+};
+
+static inline u32 omap_rng_read(struct omap_rng_dev *priv, u16 reg)
+{
+	return __raw_readl(priv->base + priv->pdata->regs[reg]);
+}
+
+static inline void omap_rng_write(struct omap_rng_dev *priv, u16 reg,
+				      u32 val)
+{
+	__raw_writel(val, priv->base + priv->pdata->regs[reg]);
+}
+
+
+static int omap_rng_do_read(struct hwrng *rng, void *data, size_t max,
+			    bool wait)
+{
+	struct omap_rng_dev *priv;
+	int i, present;
+
+	priv = (struct omap_rng_dev *)rng->priv;
+
+	if (max < priv->pdata->data_size)
+		return 0;
+
+	for (i = 0; i < RNG_DATA_FILL_TIMEOUT; i++) {
+		present = priv->pdata->data_present(priv);
+		if (present || !wait)
+			break;
+
+		udelay(10);
+	}
+	if (!present)
+		return 0;
+
+	memcpy_fromio(data, priv->base + priv->pdata->regs[RNG_OUTPUT_0_REG],
+		      priv->pdata->data_size);
+
+	if (priv->pdata->regs[RNG_INTACK_REG])
+		omap_rng_write(priv, RNG_INTACK_REG, RNG_REG_INTACK_RDY_MASK);
+
+	return priv->pdata->data_size;
+}
+
+static int omap_rng_init(struct hwrng *rng)
+{
+	struct omap_rng_dev *priv;
+
+	priv = (struct omap_rng_dev *)rng->priv;
+	return priv->pdata->init(priv);
+}
+
+static void omap_rng_cleanup(struct hwrng *rng)
+{
+	struct omap_rng_dev *priv;
+
+	priv = (struct omap_rng_dev *)rng->priv;
+	priv->pdata->cleanup(priv);
+}
+
+
+static inline u32 omap2_rng_data_present(struct omap_rng_dev *priv)
+{
+	return omap_rng_read(priv, RNG_STATUS_REG) ? 0 : 1;
+}
+
+static int omap2_rng_init(struct omap_rng_dev *priv)
+{
+	omap_rng_write(priv, RNG_SYSCONFIG_REG, 0x1);
+	return 0;
+}
+
+static void omap2_rng_cleanup(struct omap_rng_dev *priv)
+{
+	omap_rng_write(priv, RNG_SYSCONFIG_REG, 0x0);
+}
+
+static struct omap_rng_pdata omap2_rng_pdata = {
+	.regs		= (u16 *)reg_map_omap2,
+	.data_size	= OMAP2_RNG_OUTPUT_SIZE,
+	.data_present	= omap2_rng_data_present,
+	.init		= omap2_rng_init,
+	.cleanup	= omap2_rng_cleanup,
+};
+
+static inline u32 omap4_rng_data_present(struct omap_rng_dev *priv)
+{
+	return omap_rng_read(priv, RNG_STATUS_REG) & RNG_REG_STATUS_RDY;
+}
+
+static int eip76_rng_init(struct omap_rng_dev *priv)
+{
+	u32 val;
+
+	/* Return if RNG is already running. */
+	if (omap_rng_read(priv, RNG_CONTROL_REG) & RNG_CONTROL_ENABLE_TRNG_MASK)
+		return 0;
+
+	/*  Number of 512 bit blocks of raw Noise Source output data that must
+	 *  be processed by either the Conditioning Function or the
+	 *  SP 800-90 DRBG ‘BC_DF’ functionality to yield a ‘full entropy’
+	 *  output value.
+	 */
+	val = 0x5 << RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT;
+
+	/* Number of FRO samples that are XOR-ed together into one bit to be
+	 * shifted into the main shift register
+	 */
+	val |= RNG_CONFIG_MAX_REFIL_CYCLES << RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT;
+	omap_rng_write(priv, RNG_CONFIG_REG, val);
+
+	/* Enable all available FROs */
+	omap_rng_write(priv, RNG_FRODETUNE_REG, 0x0);
+	omap_rng_write(priv, RNG_FROENABLE_REG, RNG_REG_FROENABLE_MASK);
+
+	/* Enable TRNG */
+	val = RNG_CONTROL_ENABLE_TRNG_MASK;
+	omap_rng_write(priv, RNG_CONTROL_REG, val);
+
+	return 0;
+}
+
+static int omap4_rng_init(struct omap_rng_dev *priv)
+{
+	u32 val;
+
+	/* Return if RNG is already running. */
+	if (omap_rng_read(priv, RNG_CONTROL_REG) & RNG_CONTROL_ENABLE_TRNG_MASK)
+		return 0;
+
+	val = RNG_CONFIG_MIN_REFIL_CYCLES << RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT;
+	val |= RNG_CONFIG_MAX_REFIL_CYCLES << RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT;
+	omap_rng_write(priv, RNG_CONFIG_REG, val);
+
+	omap_rng_write(priv, RNG_FRODETUNE_REG, 0x0);
+	omap_rng_write(priv, RNG_FROENABLE_REG, RNG_REG_FROENABLE_MASK);
+	val = RNG_ALARM_THRESHOLD << RNG_ALARMCNT_ALARM_TH_SHIFT;
+	val |= RNG_SHUTDOWN_THRESHOLD << RNG_ALARMCNT_SHUTDOWN_TH_SHIFT;
+	omap_rng_write(priv, RNG_ALARMCNT_REG, val);
+
+	val = RNG_CONTROL_STARTUP_CYCLES << RNG_CONTROL_STARTUP_CYCLES_SHIFT;
+	val |= RNG_CONTROL_ENABLE_TRNG_MASK;
+	omap_rng_write(priv, RNG_CONTROL_REG, val);
+
+	return 0;
+}
+
+static void omap4_rng_cleanup(struct omap_rng_dev *priv)
+{
+	int val;
+
+	val = omap_rng_read(priv, RNG_CONTROL_REG);
+	val &= ~RNG_CONTROL_ENABLE_TRNG_MASK;
+	omap_rng_write(priv, RNG_CONTROL_REG, val);
+}
+
+static irqreturn_t omap4_rng_irq(int irq, void *dev_id)
+{
+	struct omap_rng_dev *priv = dev_id;
+	u32 fro_detune, fro_enable;
+
+	/*
+	 * Interrupt raised by a fro shutdown threshold, do the following:
+	 * 1. Clear the alarm events.
+	 * 2. De tune the FROs which are shutdown.
+	 * 3. Re enable the shutdown FROs.
+	 */
+	omap_rng_write(priv, RNG_ALARMMASK_REG, 0x0);
+	omap_rng_write(priv, RNG_ALARMSTOP_REG, 0x0);
+
+	fro_enable = omap_rng_read(priv, RNG_FROENABLE_REG);
+	fro_detune = ~fro_enable & RNG_REG_FRODETUNE_MASK;
+	fro_detune = fro_detune | omap_rng_read(priv, RNG_FRODETUNE_REG);
+	fro_enable = RNG_REG_FROENABLE_MASK;
+
+	omap_rng_write(priv, RNG_FRODETUNE_REG, fro_detune);
+	omap_rng_write(priv, RNG_FROENABLE_REG, fro_enable);
+
+	omap_rng_write(priv, RNG_INTACK_REG, RNG_REG_INTACK_SHUTDOWN_OFLO_MASK);
+
+	return IRQ_HANDLED;
+}
+
+static struct omap_rng_pdata omap4_rng_pdata = {
+	.regs		= (u16 *)reg_map_omap4,
+	.data_size	= OMAP4_RNG_OUTPUT_SIZE,
+	.data_present	= omap4_rng_data_present,
+	.init		= omap4_rng_init,
+	.cleanup	= omap4_rng_cleanup,
+};
+
+static struct omap_rng_pdata eip76_rng_pdata = {
+	.regs		= (u16 *)reg_map_eip76,
+	.data_size	= EIP76_RNG_OUTPUT_SIZE,
+	.data_present	= omap4_rng_data_present,
+	.init		= eip76_rng_init,
+	.cleanup	= omap4_rng_cleanup,
+};
+
+static const struct of_device_id omap_rng_of_match[] __maybe_unused = {
+		{
+			.compatible	= "ti,omap2-rng",
+			.data		= &omap2_rng_pdata,
+		},
+		{
+			.compatible	= "ti,omap4-rng",
+			.data		= &omap4_rng_pdata,
+		},
+		{
+			.compatible	= "inside-secure,safexcel-eip76",
+			.data		= &eip76_rng_pdata,
+		},
+		{},
+};
+MODULE_DEVICE_TABLE(of, omap_rng_of_match);
+
+static int of_get_omap_rng_device_details(struct omap_rng_dev *priv,
+					  struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int irq, err;
+
+	priv->pdata = of_device_get_match_data(dev);
+	if (!priv->pdata)
+		return -ENODEV;
+
+
+	if (of_device_is_compatible(dev->of_node, "ti,omap4-rng") ||
+	    of_device_is_compatible(dev->of_node, "inside-secure,safexcel-eip76")) {
+		irq = platform_get_irq(pdev, 0);
+		if (irq < 0)
+			return irq;
+
+		err = devm_request_irq(dev, irq, omap4_rng_irq,
+				       IRQF_TRIGGER_NONE, dev_name(dev), priv);
+		if (err) {
+			dev_err(dev, "unable to request irq %d, err = %d\n",
+				irq, err);
+			return err;
+		}
+
+		/*
+		 * On OMAP4, enabling the shutdown_oflo interrupt is
+		 * done in the interrupt mask register. There is no
+		 * such register on EIP76, and it's enabled by the
+		 * same bit in the control register
+		 */
+		if (priv->pdata->regs[RNG_INTMASK_REG])
+			omap_rng_write(priv, RNG_INTMASK_REG,
+				       RNG_SHUTDOWN_OFLO_MASK);
+		else
+			omap_rng_write(priv, RNG_CONTROL_REG,
+				       RNG_SHUTDOWN_OFLO_MASK);
+	}
+	return 0;
+}
+
+static int get_omap_rng_device_details(struct omap_rng_dev *omap_rng)
+{
+	/* Only OMAP2/3 can be non-DT */
+	omap_rng->pdata = &omap2_rng_pdata;
+	return 0;
+}
+
+static int omap_rng_probe(struct platform_device *pdev)
+{
+	struct omap_rng_dev *priv;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(struct omap_rng_dev), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->rng.read = omap_rng_do_read;
+	priv->rng.init = omap_rng_init;
+	priv->rng.cleanup = omap_rng_cleanup;
+	priv->rng.quality = 900;
+
+	priv->rng.priv = (unsigned long)priv;
+	platform_set_drvdata(pdev, priv);
+	priv->dev = dev;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base)) {
+		ret = PTR_ERR(priv->base);
+		goto err_ioremap;
+	}
+
+	priv->rng.name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+	if (!priv->rng.name) {
+		ret = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret);
+		goto err_ioremap;
+	}
+
+	priv->clk = devm_clk_get(&pdev->dev, NULL);
+	if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
+	if (!IS_ERR(priv->clk)) {
+		ret = clk_prepare_enable(priv->clk);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Unable to enable the clk: %d\n", ret);
+			goto err_register;
+		}
+	}
+
+	priv->clk_reg = devm_clk_get(&pdev->dev, "reg");
+	if (PTR_ERR(priv->clk_reg) == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
+	if (!IS_ERR(priv->clk_reg)) {
+		ret = clk_prepare_enable(priv->clk_reg);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Unable to enable the register clk: %d\n",
+				ret);
+			goto err_register;
+		}
+	}
+
+	ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) :
+				get_omap_rng_device_details(priv);
+	if (ret)
+		goto err_register;
+
+	ret = devm_hwrng_register(&pdev->dev, &priv->rng);
+	if (ret)
+		goto err_register;
+
+	dev_info(&pdev->dev, "Random Number Generator ver. %02x\n",
+		 omap_rng_read(priv, RNG_REV_REG));
+
+	return 0;
+
+err_register:
+	priv->base = NULL;
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	clk_disable_unprepare(priv->clk_reg);
+	clk_disable_unprepare(priv->clk);
+err_ioremap:
+	dev_err(dev, "initialization failed.\n");
+	return ret;
+}
+
+static int omap_rng_remove(struct platform_device *pdev)
+{
+	struct omap_rng_dev *priv = platform_get_drvdata(pdev);
+
+
+	priv->pdata->cleanup(priv);
+
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk_reg);
+
+	return 0;
+}
+
+static int __maybe_unused omap_rng_suspend(struct device *dev)
+{
+	struct omap_rng_dev *priv = dev_get_drvdata(dev);
+
+	priv->pdata->cleanup(priv);
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int __maybe_unused omap_rng_resume(struct device *dev)
+{
+	struct omap_rng_dev *priv = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to runtime_get device: %d\n", ret);
+		return ret;
+	}
+
+	priv->pdata->init(priv);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(omap_rng_pm, omap_rng_suspend, omap_rng_resume);
+
+static struct platform_driver omap_rng_driver = {
+	.driver = {
+		.name		= "omap_rng",
+		.pm		= &omap_rng_pm,
+		.of_match_table = of_match_ptr(omap_rng_of_match),
+	},
+	.probe		= omap_rng_probe,
+	.remove		= omap_rng_remove,
+};
+
+module_platform_driver(omap_rng_driver);
+MODULE_ALIAS("platform:omap_rng");
+MODULE_AUTHOR("Deepak Saxena (and others)");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/omap3-rom-rng.c b/drivers/char/hw_random/omap3-rom-rng.c
new file mode 100644
index 000000000..f06e4f951
--- /dev/null
+++ b/drivers/char/hw_random/omap3-rom-rng.c
@@ -0,0 +1,182 @@
+/*
+ * omap3-rom-rng.c - RNG driver for TI OMAP3 CPU family
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Juha Yrjola <juha.yrjola@solidboot.com>
+ *
+ * Copyright (C) 2013 Pali Rohár <pali@kernel.org>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/random.h>
+#include <linux/hw_random.h>
+#include <linux/workqueue.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#define RNG_RESET			0x01
+#define RNG_GEN_PRNG_HW_INIT		0x02
+#define RNG_GEN_HW			0x08
+
+struct omap_rom_rng {
+	struct clk *clk;
+	struct device *dev;
+	struct hwrng ops;
+	u32 (*rom_rng_call)(u32 ptr, u32 count, u32 flag);
+};
+
+static int omap3_rom_rng_read(struct hwrng *rng, void *data, size_t max, bool w)
+{
+	struct omap_rom_rng *ddata;
+	u32 ptr;
+	int r;
+
+	ddata = (struct omap_rom_rng *)rng->priv;
+
+	r = pm_runtime_get_sync(ddata->dev);
+	if (r < 0) {
+		pm_runtime_put_noidle(ddata->dev);
+
+		return r;
+	}
+
+	ptr = virt_to_phys(data);
+	r = ddata->rom_rng_call(ptr, 4, RNG_GEN_HW);
+	if (r != 0)
+		r = -EINVAL;
+	else
+		r = 4;
+
+	pm_runtime_mark_last_busy(ddata->dev);
+	pm_runtime_put_autosuspend(ddata->dev);
+
+	return r;
+}
+
+static int __maybe_unused omap_rom_rng_runtime_suspend(struct device *dev)
+{
+	struct omap_rom_rng *ddata;
+	int r;
+
+	ddata = dev_get_drvdata(dev);
+
+	r = ddata->rom_rng_call(0, 0, RNG_RESET);
+	if (r != 0)
+		dev_err(dev, "reset failed: %d\n", r);
+
+	clk_disable_unprepare(ddata->clk);
+
+	return 0;
+}
+
+static int __maybe_unused omap_rom_rng_runtime_resume(struct device *dev)
+{
+	struct omap_rom_rng *ddata;
+	int r;
+
+	ddata = dev_get_drvdata(dev);
+
+	r = clk_prepare_enable(ddata->clk);
+	if (r < 0)
+		return r;
+
+	r = ddata->rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);
+	if (r != 0) {
+		clk_disable_unprepare(ddata->clk);
+		dev_err(dev, "HW init failed: %d\n", r);
+
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void omap_rom_rng_finish(void *data)
+{
+	struct omap_rom_rng *ddata = data;
+
+	pm_runtime_dont_use_autosuspend(ddata->dev);
+	pm_runtime_disable(ddata->dev);
+}
+
+static int omap3_rom_rng_probe(struct platform_device *pdev)
+{
+	struct omap_rom_rng *ddata;
+	int ret = 0;
+
+	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	ddata->dev = &pdev->dev;
+	ddata->ops.priv = (unsigned long)ddata;
+	ddata->ops.name = "omap3-rom";
+	ddata->ops.read = of_device_get_match_data(&pdev->dev);
+	ddata->ops.quality = 900;
+	if (!ddata->ops.read) {
+		dev_err(&pdev->dev, "missing rom code handler\n");
+
+		return -ENODEV;
+	}
+	dev_set_drvdata(ddata->dev, ddata);
+
+	ddata->rom_rng_call = pdev->dev.platform_data;
+	if (!ddata->rom_rng_call) {
+		dev_err(ddata->dev, "rom_rng_call is NULL\n");
+		return -EINVAL;
+	}
+
+	ddata->clk = devm_clk_get(ddata->dev, "ick");
+	if (IS_ERR(ddata->clk)) {
+		dev_err(ddata->dev, "unable to get RNG clock\n");
+		return PTR_ERR(ddata->clk);
+	}
+
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
+	pm_runtime_use_autosuspend(&pdev->dev);
+
+	ret = devm_add_action_or_reset(ddata->dev, omap_rom_rng_finish,
+				       ddata);
+	if (ret)
+		return ret;
+
+	return devm_hwrng_register(ddata->dev, &ddata->ops);
+}
+
+static const struct of_device_id omap_rom_rng_match[] = {
+	{ .compatible = "nokia,n900-rom-rng", .data = omap3_rom_rng_read, },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, omap_rom_rng_match);
+
+static const struct dev_pm_ops omap_rom_rng_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(omap_rom_rng_runtime_suspend,
+				omap_rom_rng_runtime_resume)
+};
+
+static struct platform_driver omap3_rom_rng_driver = {
+	.driver = {
+		.name		= "omap3-rom-rng",
+		.of_match_table = omap_rom_rng_match,
+		.pm = &omap_rom_rng_pm_ops,
+	},
+	.probe		= omap3_rom_rng_probe,
+};
+
+module_platform_driver(omap3_rom_rng_driver);
+
+MODULE_ALIAS("platform:omap3-rom-rng");
+MODULE_AUTHOR("Juha Yrjola");
+MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/optee-rng.c b/drivers/char/hw_random/optee-rng.c
new file mode 100644
index 000000000..96b5d546d
--- /dev/null
+++ b/drivers/char/hw_random/optee-rng.c
@@ -0,0 +1,305 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018-2019 Linaro Ltd.
+ */
+
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include <linux/uuid.h>
+
+#define DRIVER_NAME "optee-rng"
+
+#define TEE_ERROR_HEALTH_TEST_FAIL	0x00000001
+
+/*
+ * TA_CMD_GET_ENTROPY - Get Entropy from RNG
+ *
+ * param[0] (inout memref) - Entropy buffer memory reference
+ * param[1] unused
+ * param[2] unused
+ * param[3] unused
+ *
+ * Result:
+ * TEE_SUCCESS - Invoke command success
+ * TEE_ERROR_BAD_PARAMETERS - Incorrect input param
+ * TEE_ERROR_NOT_SUPPORTED - Requested entropy size greater than size of pool
+ * TEE_ERROR_HEALTH_TEST_FAIL - Continuous health testing failed
+ */
+#define TA_CMD_GET_ENTROPY		0x0
+
+/*
+ * TA_CMD_GET_RNG_INFO - Get RNG information
+ *
+ * param[0] (out value) - value.a: RNG data-rate in bytes per second
+ *                        value.b: Quality/Entropy per 1024 bit of data
+ * param[1] unused
+ * param[2] unused
+ * param[3] unused
+ *
+ * Result:
+ * TEE_SUCCESS - Invoke command success
+ * TEE_ERROR_BAD_PARAMETERS - Incorrect input param
+ */
+#define TA_CMD_GET_RNG_INFO		0x1
+
+#define MAX_ENTROPY_REQ_SZ		(4 * 1024)
+
+/**
+ * struct optee_rng_private - OP-TEE Random Number Generator private data
+ * @dev:		OP-TEE based RNG device.
+ * @ctx:		OP-TEE context handler.
+ * @session_id:		RNG TA session identifier.
+ * @data_rate:		RNG data rate.
+ * @entropy_shm_pool:	Memory pool shared with RNG device.
+ * @optee_rng:		OP-TEE RNG driver structure.
+ */
+struct optee_rng_private {
+	struct device *dev;
+	struct tee_context *ctx;
+	u32 session_id;
+	u32 data_rate;
+	struct tee_shm *entropy_shm_pool;
+	struct hwrng optee_rng;
+};
+
+#define to_optee_rng_private(r) \
+		container_of(r, struct optee_rng_private, optee_rng)
+
+static size_t get_optee_rng_data(struct optee_rng_private *pvt_data,
+				 void *buf, size_t req_size)
+{
+	int ret = 0;
+	u8 *rng_data = NULL;
+	size_t rng_size = 0;
+	struct tee_ioctl_invoke_arg inv_arg;
+	struct tee_param param[4];
+
+	memset(&inv_arg, 0, sizeof(inv_arg));
+	memset(&param, 0, sizeof(param));
+
+	/* Invoke TA_CMD_GET_ENTROPY function of Trusted App */
+	inv_arg.func = TA_CMD_GET_ENTROPY;
+	inv_arg.session = pvt_data->session_id;
+	inv_arg.num_params = 4;
+
+	/* Fill invoke cmd params */
+	param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
+	param[0].u.memref.shm = pvt_data->entropy_shm_pool;
+	param[0].u.memref.size = req_size;
+	param[0].u.memref.shm_offs = 0;
+
+	ret = tee_client_invoke_func(pvt_data->ctx, &inv_arg, param);
+	if ((ret < 0) || (inv_arg.ret != 0)) {
+		dev_err(pvt_data->dev, "TA_CMD_GET_ENTROPY invoke err: %x\n",
+			inv_arg.ret);
+		return 0;
+	}
+
+	rng_data = tee_shm_get_va(pvt_data->entropy_shm_pool, 0);
+	if (IS_ERR(rng_data)) {
+		dev_err(pvt_data->dev, "tee_shm_get_va failed\n");
+		return 0;
+	}
+
+	rng_size = param[0].u.memref.size;
+	memcpy(buf, rng_data, rng_size);
+
+	return rng_size;
+}
+
+static int optee_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct optee_rng_private *pvt_data = to_optee_rng_private(rng);
+	size_t read = 0, rng_size;
+	int timeout = 1;
+	u8 *data = buf;
+
+	if (max > MAX_ENTROPY_REQ_SZ)
+		max = MAX_ENTROPY_REQ_SZ;
+
+	while (read < max) {
+		rng_size = get_optee_rng_data(pvt_data, data, (max - read));
+
+		data += rng_size;
+		read += rng_size;
+
+		if (wait && pvt_data->data_rate) {
+			if ((timeout-- == 0) || (read == max))
+				return read;
+			msleep((1000 * (max - read)) / pvt_data->data_rate);
+		} else {
+			return read;
+		}
+	}
+
+	return read;
+}
+
+static int optee_rng_init(struct hwrng *rng)
+{
+	struct optee_rng_private *pvt_data = to_optee_rng_private(rng);
+	struct tee_shm *entropy_shm_pool = NULL;
+
+	entropy_shm_pool = tee_shm_alloc_kernel_buf(pvt_data->ctx,
+						    MAX_ENTROPY_REQ_SZ);
+	if (IS_ERR(entropy_shm_pool)) {
+		dev_err(pvt_data->dev, "tee_shm_alloc_kernel_buf failed\n");
+		return PTR_ERR(entropy_shm_pool);
+	}
+
+	pvt_data->entropy_shm_pool = entropy_shm_pool;
+
+	return 0;
+}
+
+static void optee_rng_cleanup(struct hwrng *rng)
+{
+	struct optee_rng_private *pvt_data = to_optee_rng_private(rng);
+
+	tee_shm_free(pvt_data->entropy_shm_pool);
+}
+
+static struct optee_rng_private pvt_data = {
+	.optee_rng = {
+		.name		= DRIVER_NAME,
+		.init		= optee_rng_init,
+		.cleanup	= optee_rng_cleanup,
+		.read		= optee_rng_read,
+	}
+};
+
+static int get_optee_rng_info(struct device *dev)
+{
+	int ret = 0;
+	struct tee_ioctl_invoke_arg inv_arg;
+	struct tee_param param[4];
+
+	memset(&inv_arg, 0, sizeof(inv_arg));
+	memset(&param, 0, sizeof(param));
+
+	/* Invoke TA_CMD_GET_RNG_INFO function of Trusted App */
+	inv_arg.func = TA_CMD_GET_RNG_INFO;
+	inv_arg.session = pvt_data.session_id;
+	inv_arg.num_params = 4;
+
+	/* Fill invoke cmd params */
+	param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
+
+	ret = tee_client_invoke_func(pvt_data.ctx, &inv_arg, param);
+	if ((ret < 0) || (inv_arg.ret != 0)) {
+		dev_err(dev, "TA_CMD_GET_RNG_INFO invoke err: %x\n",
+			inv_arg.ret);
+		return -EINVAL;
+	}
+
+	pvt_data.data_rate = param[0].u.value.a;
+	pvt_data.optee_rng.quality = param[0].u.value.b;
+
+	return 0;
+}
+
+static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
+{
+	if (ver->impl_id == TEE_IMPL_ID_OPTEE)
+		return 1;
+	else
+		return 0;
+}
+
+static int optee_rng_probe(struct device *dev)
+{
+	struct tee_client_device *rng_device = to_tee_client_device(dev);
+	int ret = 0, err = -ENODEV;
+	struct tee_ioctl_open_session_arg sess_arg;
+
+	memset(&sess_arg, 0, sizeof(sess_arg));
+
+	/* Open context with TEE driver */
+	pvt_data.ctx = tee_client_open_context(NULL, optee_ctx_match, NULL,
+					       NULL);
+	if (IS_ERR(pvt_data.ctx))
+		return -ENODEV;
+
+	/* Open session with hwrng Trusted App */
+	export_uuid(sess_arg.uuid, &rng_device->id.uuid);
+	sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
+	sess_arg.num_params = 0;
+
+	ret = tee_client_open_session(pvt_data.ctx, &sess_arg, NULL);
+	if ((ret < 0) || (sess_arg.ret != 0)) {
+		dev_err(dev, "tee_client_open_session failed, err: %x\n",
+			sess_arg.ret);
+		err = -EINVAL;
+		goto out_ctx;
+	}
+	pvt_data.session_id = sess_arg.session;
+
+	err = get_optee_rng_info(dev);
+	if (err)
+		goto out_sess;
+
+	err = devm_hwrng_register(dev, &pvt_data.optee_rng);
+	if (err) {
+		dev_err(dev, "hwrng registration failed (%d)\n", err);
+		goto out_sess;
+	}
+
+	pvt_data.dev = dev;
+
+	return 0;
+
+out_sess:
+	tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
+out_ctx:
+	tee_client_close_context(pvt_data.ctx);
+
+	return err;
+}
+
+static int optee_rng_remove(struct device *dev)
+{
+	tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
+	tee_client_close_context(pvt_data.ctx);
+
+	return 0;
+}
+
+static const struct tee_client_device_id optee_rng_id_table[] = {
+	{UUID_INIT(0xab7a617c, 0xb8e7, 0x4d8f,
+		   0x83, 0x01, 0xd0, 0x9b, 0x61, 0x03, 0x6b, 0x64)},
+	{}
+};
+
+MODULE_DEVICE_TABLE(tee, optee_rng_id_table);
+
+static struct tee_client_driver optee_rng_driver = {
+	.id_table	= optee_rng_id_table,
+	.driver		= {
+		.name		= DRIVER_NAME,
+		.bus		= &tee_bus_type,
+		.probe		= optee_rng_probe,
+		.remove		= optee_rng_remove,
+	},
+};
+
+static int __init optee_rng_mod_init(void)
+{
+	return driver_register(&optee_rng_driver.driver);
+}
+
+static void __exit optee_rng_mod_exit(void)
+{
+	driver_unregister(&optee_rng_driver.driver);
+}
+
+module_init(optee_rng_mod_init);
+module_exit(optee_rng_mod_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sumit Garg <sumit.garg@linaro.org>");
+MODULE_DESCRIPTION("OP-TEE based random number generator driver");
diff --git a/drivers/char/hw_random/pasemi-rng.c b/drivers/char/hw_random/pasemi-rng.c
new file mode 100644
index 000000000..2498d4ef9
--- /dev/null
+++ b/drivers/char/hw_random/pasemi-rng.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Maintained by: Olof Johansson <olof@lixom.net>
+ *
+ * Driver for the PWRficient onchip rng
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/hw_random.h>
+#include <linux/delay.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/io.h>
+
+#define SDCRNG_CTL_REG			0x00
+#define   SDCRNG_CTL_FVLD_M		0x0000f000
+#define   SDCRNG_CTL_FVLD_S		12
+#define   SDCRNG_CTL_KSZ		0x00000800
+#define   SDCRNG_CTL_RSRC_CRG		0x00000010
+#define   SDCRNG_CTL_RSRC_RRG		0x00000000
+#define   SDCRNG_CTL_CE			0x00000004
+#define   SDCRNG_CTL_RE			0x00000002
+#define   SDCRNG_CTL_DR			0x00000001
+#define   SDCRNG_CTL_SELECT_RRG_RNG	(SDCRNG_CTL_RE | SDCRNG_CTL_RSRC_RRG)
+#define   SDCRNG_CTL_SELECT_CRG_RNG	(SDCRNG_CTL_CE | SDCRNG_CTL_RSRC_CRG)
+#define SDCRNG_VAL_REG			0x20
+
+#define MODULE_NAME "pasemi_rng"
+
+static int pasemi_rng_data_present(struct hwrng *rng, int wait)
+{
+	void __iomem *rng_regs = (void __iomem *)rng->priv;
+	int data, i;
+
+	for (i = 0; i < 20; i++) {
+		data = (in_le32(rng_regs + SDCRNG_CTL_REG)
+			& SDCRNG_CTL_FVLD_M) ? 1 : 0;
+		if (data || !wait)
+			break;
+		udelay(10);
+	}
+	return data;
+}
+
+static int pasemi_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	void __iomem *rng_regs = (void __iomem *)rng->priv;
+	*data = in_le32(rng_regs + SDCRNG_VAL_REG);
+	return 4;
+}
+
+static int pasemi_rng_init(struct hwrng *rng)
+{
+	void __iomem *rng_regs = (void __iomem *)rng->priv;
+	u32 ctl;
+
+	ctl = SDCRNG_CTL_DR | SDCRNG_CTL_SELECT_RRG_RNG | SDCRNG_CTL_KSZ;
+	out_le32(rng_regs + SDCRNG_CTL_REG, ctl);
+	out_le32(rng_regs + SDCRNG_CTL_REG, ctl & ~SDCRNG_CTL_DR);
+
+	return 0;
+}
+
+static void pasemi_rng_cleanup(struct hwrng *rng)
+{
+	void __iomem *rng_regs = (void __iomem *)rng->priv;
+	u32 ctl;
+
+	ctl = SDCRNG_CTL_RE | SDCRNG_CTL_CE;
+	out_le32(rng_regs + SDCRNG_CTL_REG,
+		 in_le32(rng_regs + SDCRNG_CTL_REG) & ~ctl);
+}
+
+static struct hwrng pasemi_rng = {
+	.name		= MODULE_NAME,
+	.init		= pasemi_rng_init,
+	.cleanup	= pasemi_rng_cleanup,
+	.data_present	= pasemi_rng_data_present,
+	.data_read	= pasemi_rng_data_read,
+};
+
+static int rng_probe(struct platform_device *pdev)
+{
+	void __iomem *rng_regs;
+
+	rng_regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rng_regs))
+		return PTR_ERR(rng_regs);
+
+	pasemi_rng.priv = (unsigned long)rng_regs;
+
+	pr_info("Registering PA Semi RNG\n");
+	return devm_hwrng_register(&pdev->dev, &pasemi_rng);
+}
+
+static const struct of_device_id rng_match[] = {
+	{ .compatible      = "1682m-rng", },
+	{ .compatible      = "pasemi,pwrficient-rng", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, rng_match);
+
+static struct platform_driver rng_driver = {
+	.driver = {
+		.name = "pasemi-rng",
+		.of_match_table = rng_match,
+	},
+	.probe		= rng_probe,
+};
+
+module_platform_driver(rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
+MODULE_DESCRIPTION("H/W RNG driver for PA Semi processor");
diff --git a/drivers/char/hw_random/pic32-rng.c b/drivers/char/hw_random/pic32-rng.c
new file mode 100644
index 000000000..e04a054e8
--- /dev/null
+++ b/drivers/char/hw_random/pic32-rng.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PIC32 RNG driver
+ *
+ * Joshua Henderson <joshua.henderson@microchip.com>
+ * Copyright (C) 2016 Microchip Technology Inc.  All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define RNGCON		0x04
+#define  TRNGEN		BIT(8)
+#define  PRNGEN		BIT(9)
+#define  PRNGCONT	BIT(10)
+#define  TRNGMOD	BIT(11)
+#define  SEEDLOAD	BIT(12)
+#define RNGPOLY1	0x08
+#define RNGPOLY2	0x0C
+#define RNGNUMGEN1	0x10
+#define RNGNUMGEN2	0x14
+#define RNGSEED1	0x18
+#define RNGSEED2	0x1C
+#define RNGRCNT		0x20
+#define  RCNT_MASK	0x7F
+
+struct pic32_rng {
+	void __iomem	*base;
+	struct hwrng	rng;
+};
+
+/*
+ * The TRNG can generate up to 24Mbps. This is a timeout that should be safe
+ * enough given the instructions in the loop and that the TRNG may not always
+ * be at maximum rate.
+ */
+#define RNG_TIMEOUT 500
+
+static int pic32_rng_read(struct hwrng *rng, void *buf, size_t max,
+			  bool wait)
+{
+	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);
+	u64 *data = buf;
+	u32 t;
+	unsigned int timeout = RNG_TIMEOUT;
+
+	do {
+		t = readl(priv->base + RNGRCNT) & RCNT_MASK;
+		if (t == 64) {
+			/* TRNG value comes through the seed registers */
+			*data = ((u64)readl(priv->base + RNGSEED2) << 32) +
+				readl(priv->base + RNGSEED1);
+			return 8;
+		}
+	} while (wait && --timeout);
+
+	return -EIO;
+}
+
+static int pic32_rng_probe(struct platform_device *pdev)
+{
+	struct pic32_rng *priv;
+	struct clk *clk;
+	u32 v;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	/* enable TRNG in enhanced mode */
+	v = TRNGEN | TRNGMOD;
+	writel(v, priv->base + RNGCON);
+
+	priv->rng.name = pdev->name;
+	priv->rng.read = pic32_rng_read;
+
+	ret = devm_hwrng_register(&pdev->dev, &priv->rng);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+
+static int pic32_rng_remove(struct platform_device *pdev)
+{
+	struct pic32_rng *rng = platform_get_drvdata(pdev);
+
+	writel(0, rng->base + RNGCON);
+	return 0;
+}
+
+static const struct of_device_id pic32_rng_of_match[] __maybe_unused = {
+	{ .compatible	= "microchip,pic32mzda-rng", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pic32_rng_of_match);
+
+static struct platform_driver pic32_rng_driver = {
+	.probe		= pic32_rng_probe,
+	.remove		= pic32_rng_remove,
+	.driver		= {
+		.name	= "pic32-rng",
+		.of_match_table = of_match_ptr(pic32_rng_of_match),
+	},
+};
+
+module_platform_driver(pic32_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joshua Henderson <joshua.henderson@microchip.com>");
+MODULE_DESCRIPTION("Microchip PIC32 RNG Driver");
diff --git a/drivers/char/hw_random/powernv-rng.c b/drivers/char/hw_random/powernv-rng.c
new file mode 100644
index 000000000..429e956f3
--- /dev/null
+++ b/drivers/char/hw_random/powernv-rng.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2013 Michael Ellerman, Guo Chao, IBM Corp.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <linux/hw_random.h>
+
+static int powernv_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	unsigned long *buf;
+	int i, len;
+
+	/* We rely on rng_buffer_size() being >= sizeof(unsigned long) */
+	len = max / sizeof(unsigned long);
+
+	buf = (unsigned long *)data;
+
+	for (i = 0; i < len; i++)
+		pnv_get_random_long(buf++);
+
+	return len * sizeof(unsigned long);
+}
+
+static struct hwrng powernv_hwrng = {
+	.name = "powernv-rng",
+	.read = powernv_rng_read,
+};
+
+static int powernv_rng_probe(struct platform_device *pdev)
+{
+	int rc;
+
+	rc = devm_hwrng_register(&pdev->dev, &powernv_hwrng);
+	if (rc) {
+		/* We only register one device, ignore any others */
+		if (rc == -EEXIST)
+			rc = -ENODEV;
+
+		return rc;
+	}
+
+	pr_info("Registered powernv hwrng.\n");
+
+	return 0;
+}
+
+static const struct of_device_id powernv_rng_match[] = {
+	{ .compatible	= "ibm,power-rng",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, powernv_rng_match);
+
+static struct platform_driver powernv_rng_driver = {
+	.driver = {
+		.name = "powernv_rng",
+		.of_match_table = powernv_rng_match,
+	},
+	.probe	= powernv_rng_probe,
+};
+module_platform_driver(powernv_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Bare metal HWRNG driver for POWER7+ and above");
diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c
new file mode 100644
index 000000000..62bdd5af1
--- /dev/null
+++ b/drivers/char/hw_random/pseries-rng.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2010 Michael Neuling IBM Corporation
+ *
+ * Driver for the pseries hardware RNG for POWER7+ and above
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hw_random.h>
+#include <asm/vio.h>
+
+
+static int pseries_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	u64 buffer[PLPAR_HCALL_BUFSIZE];
+	int rc;
+
+	rc = plpar_hcall(H_RANDOM, (unsigned long *)buffer);
+	if (rc != H_SUCCESS) {
+		pr_err_ratelimited("H_RANDOM call failed %d\n", rc);
+		return -EIO;
+	}
+	memcpy(data, buffer, 8);
+
+	/* The hypervisor interface returns 64 bits */
+	return 8;
+}
+
+/*
+ * pseries_rng_get_desired_dma - Return desired DMA allocate for CMO operations
+ *
+ * This is a required function for a driver to operate in a CMO environment
+ * but this device does not make use of DMA allocations, return 0.
+ *
+ * Return value:
+ *	Number of bytes of IO data the driver will need to perform well -> 0
+ */
+static unsigned long pseries_rng_get_desired_dma(struct vio_dev *vdev)
+{
+	return 0;
+};
+
+static struct hwrng pseries_rng = {
+	.name		= KBUILD_MODNAME,
+	.read		= pseries_rng_read,
+};
+
+static int pseries_rng_probe(struct vio_dev *dev,
+		const struct vio_device_id *id)
+{
+	return hwrng_register(&pseries_rng);
+}
+
+static void pseries_rng_remove(struct vio_dev *dev)
+{
+	hwrng_unregister(&pseries_rng);
+}
+
+static const struct vio_device_id pseries_rng_driver_ids[] = {
+	{ "ibm,random-v1", "ibm,random"},
+	{ "", "" }
+};
+MODULE_DEVICE_TABLE(vio, pseries_rng_driver_ids);
+
+static struct vio_driver pseries_rng_driver = {
+	.name = KBUILD_MODNAME,
+	.probe = pseries_rng_probe,
+	.remove = pseries_rng_remove,
+	.get_desired_dma = pseries_rng_get_desired_dma,
+	.id_table = pseries_rng_driver_ids
+};
+
+static int __init rng_init(void)
+{
+	pr_info("Registering IBM pSeries RNG driver\n");
+	return vio_register_driver(&pseries_rng_driver);
+}
+
+module_init(rng_init);
+
+static void __exit rng_exit(void)
+{
+	vio_unregister_driver(&pseries_rng_driver);
+}
+module_exit(rng_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Neuling <mikey@neuling.org>");
+MODULE_DESCRIPTION("H/W RNG driver for IBM pSeries processors");
diff --git a/drivers/char/hw_random/s390-trng.c b/drivers/char/hw_random/s390-trng.c
new file mode 100644
index 000000000..795853dfc
--- /dev/null
+++ b/drivers/char/hw_random/s390-trng.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * s390 TRNG device driver
+ *
+ * Driver for the TRNG (true random number generation) command
+ * available via CPACF extension MSA 7 on the s390 arch.
+
+ * Copyright IBM Corp. 2017
+ * Author(s): Harald Freudenberger <freude@de.ibm.com>
+ */
+
+#define KMSG_COMPONENT "trng"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/cpufeature.h>
+#include <linux/miscdevice.h>
+#include <linux/debugfs.h>
+#include <linux/atomic.h>
+#include <linux/random.h>
+#include <linux/sched/signal.h>
+#include <asm/debug.h>
+#include <asm/cpacf.h>
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("s390 CPACF TRNG device driver");
+
+
+/* trng related debug feature things */
+
+static debug_info_t *debug_info;
+
+#define DEBUG_DBG(...)	debug_sprintf_event(debug_info, 6, ##__VA_ARGS__)
+#define DEBUG_INFO(...) debug_sprintf_event(debug_info, 5, ##__VA_ARGS__)
+#define DEBUG_WARN(...) debug_sprintf_event(debug_info, 4, ##__VA_ARGS__)
+#define DEBUG_ERR(...)	debug_sprintf_event(debug_info, 3, ##__VA_ARGS__)
+
+
+/* trng helpers */
+
+static atomic64_t trng_dev_counter = ATOMIC64_INIT(0);
+static atomic64_t trng_hwrng_counter = ATOMIC64_INIT(0);
+
+
+/* file io functions */
+
+static int trng_open(struct inode *inode, struct file *file)
+{
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t trng_read(struct file *file, char __user *ubuf,
+			 size_t nbytes, loff_t *ppos)
+{
+	u8 buf[32];
+	u8 *p = buf;
+	unsigned int n;
+	ssize_t ret = 0;
+
+	/*
+	 * use buf for requests <= sizeof(buf),
+	 * otherwise allocate one page and fetch
+	 * pagewise.
+	 */
+
+	if (nbytes > sizeof(buf)) {
+		p = (u8 *) __get_free_page(GFP_KERNEL);
+		if (!p)
+			return -ENOMEM;
+	}
+
+	while (nbytes) {
+		if (need_resched()) {
+			if (signal_pending(current)) {
+				if (ret == 0)
+					ret = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+		}
+		n = nbytes > PAGE_SIZE ? PAGE_SIZE : nbytes;
+		cpacf_trng(NULL, 0, p, n);
+		atomic64_add(n, &trng_dev_counter);
+		if (copy_to_user(ubuf, p, n)) {
+			ret = -EFAULT;
+			break;
+		}
+		nbytes -= n;
+		ubuf += n;
+		ret += n;
+	}
+
+	if (p != buf)
+		free_page((unsigned long) p);
+
+	DEBUG_DBG("trng_read()=%zd\n", ret);
+	return ret;
+}
+
+
+/* sysfs */
+
+static ssize_t trng_counter_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	u64 dev_counter = atomic64_read(&trng_dev_counter);
+	u64 hwrng_counter = atomic64_read(&trng_hwrng_counter);
+	u64 arch_counter = atomic64_read(&s390_arch_random_counter);
+
+	return sysfs_emit(buf,
+			"trng:  %llu\n"
+			"hwrng: %llu\n"
+			"arch:  %llu\n"
+			"total: %llu\n",
+			dev_counter, hwrng_counter, arch_counter,
+			dev_counter + hwrng_counter + arch_counter);
+}
+static DEVICE_ATTR(byte_counter, 0444, trng_counter_show, NULL);
+
+static struct attribute *trng_dev_attrs[] = {
+	&dev_attr_byte_counter.attr,
+	NULL
+};
+
+static const struct attribute_group trng_dev_attr_group = {
+	.attrs = trng_dev_attrs
+};
+
+static const struct attribute_group *trng_dev_attr_groups[] = {
+	&trng_dev_attr_group,
+	NULL
+};
+
+static const struct file_operations trng_fops = {
+	.owner		= THIS_MODULE,
+	.open		= &trng_open,
+	.release	= NULL,
+	.read		= &trng_read,
+	.llseek		= noop_llseek,
+};
+
+static struct miscdevice trng_dev = {
+	.name	= "trng",
+	.minor	= MISC_DYNAMIC_MINOR,
+	.mode	= 0444,
+	.fops	= &trng_fops,
+	.groups = trng_dev_attr_groups,
+};
+
+
+/* hwrng_register */
+
+static inline void _trng_hwrng_read(u8 *buf, size_t len)
+{
+	cpacf_trng(NULL, 0, buf, len);
+	atomic64_add(len, &trng_hwrng_counter);
+}
+
+static int trng_hwrng_data_read(struct hwrng *rng, u32 *data)
+{
+	size_t len = sizeof(*data);
+
+	_trng_hwrng_read((u8 *) data, len);
+
+	DEBUG_DBG("trng_hwrng_data_read()=%zu\n", len);
+
+	return len;
+}
+
+static int trng_hwrng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	size_t len = max <= PAGE_SIZE ? max : PAGE_SIZE;
+
+	_trng_hwrng_read((u8 *) data, len);
+
+	DEBUG_DBG("trng_hwrng_read()=%zu\n", len);
+
+	return len;
+}
+
+/*
+ * hwrng register struct
+ * The trng is supposed to have 100% entropy, and thus we register with a very
+ * high quality value. If we ever have a better driver in the future, we should
+ * change this value again when we merge this driver.
+ */
+static struct hwrng trng_hwrng_dev = {
+	.name		= "s390-trng",
+	.data_read	= trng_hwrng_data_read,
+	.read		= trng_hwrng_read,
+	.quality	= 1024,
+};
+
+
+/* init and exit */
+
+static void __init trng_debug_init(void)
+{
+	debug_info = debug_register("trng", 1, 1, 4 * sizeof(long));
+	debug_register_view(debug_info, &debug_sprintf_view);
+	debug_set_level(debug_info, 3);
+}
+
+static void trng_debug_exit(void)
+{
+	debug_unregister(debug_info);
+}
+
+static int __init trng_init(void)
+{
+	int ret;
+
+	trng_debug_init();
+
+	/* check if subfunction CPACF_PRNO_TRNG is available */
+	if (!cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) {
+		DEBUG_INFO("trng_init CPACF_PRNO_TRNG not available\n");
+		ret = -ENODEV;
+		goto out_dbg;
+	}
+
+	ret = misc_register(&trng_dev);
+	if (ret) {
+		DEBUG_WARN("trng_init misc_register() failed rc=%d\n", ret);
+		goto out_dbg;
+	}
+
+	ret = hwrng_register(&trng_hwrng_dev);
+	if (ret) {
+		DEBUG_WARN("trng_init hwrng_register() failed rc=%d\n", ret);
+		goto out_misc;
+	}
+
+	DEBUG_DBG("trng_init successful\n");
+
+	return 0;
+
+out_misc:
+	misc_deregister(&trng_dev);
+out_dbg:
+	trng_debug_exit();
+	return ret;
+}
+
+static void __exit trng_exit(void)
+{
+	hwrng_unregister(&trng_hwrng_dev);
+	misc_deregister(&trng_dev);
+	trng_debug_exit();
+}
+
+module_cpu_feature_match(S390_CPU_FEATURE_MSA, trng_init);
+module_exit(trng_exit);
diff --git a/drivers/char/hw_random/st-rng.c b/drivers/char/hw_random/st-rng.c
new file mode 100644
index 000000000..6e9dfac9f
--- /dev/null
+++ b/drivers/char/hw_random/st-rng.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ST Random Number Generator Driver ST's Platforms
+ *
+ * Author: Pankaj Dev: <pankaj.dev@st.com>
+ *         Lee Jones <lee.jones@linaro.org>
+ *
+ * Copyright (C) 2015 STMicroelectronics (R&D) Limited
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* Registers */
+#define ST_RNG_STATUS_REG		0x20
+#define ST_RNG_DATA_REG			0x24
+
+/* Registers fields */
+#define ST_RNG_STATUS_BAD_SEQUENCE	BIT(0)
+#define ST_RNG_STATUS_BAD_ALTERNANCE	BIT(1)
+#define ST_RNG_STATUS_FIFO_FULL		BIT(5)
+
+#define ST_RNG_SAMPLE_SIZE		2 /* 2 Byte (16bit) samples */
+#define ST_RNG_FIFO_DEPTH		4
+#define ST_RNG_FIFO_SIZE		(ST_RNG_FIFO_DEPTH * ST_RNG_SAMPLE_SIZE)
+
+/*
+ * Samples are documented to be available every 0.667us, so in theory
+ * the 4 sample deep FIFO should take 2.668us to fill.  However, during
+ * thorough testing, it became apparent that filling the FIFO actually
+ * takes closer to 12us.  We then multiply by 2 in order to account for
+ * the lack of udelay()'s reliability, suggested by Russell King.
+ */
+#define ST_RNG_FILL_FIFO_TIMEOUT	(12 * 2)
+
+struct st_rng_data {
+	void __iomem	*base;
+	struct hwrng	ops;
+};
+
+static int st_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	struct st_rng_data *ddata = (struct st_rng_data *)rng->priv;
+	u32 status;
+	int i;
+
+	/* Wait until FIFO is full - max 4uS*/
+	for (i = 0; i < ST_RNG_FILL_FIFO_TIMEOUT; i++) {
+		status = readl_relaxed(ddata->base + ST_RNG_STATUS_REG);
+		if (status & ST_RNG_STATUS_FIFO_FULL)
+			break;
+		udelay(1);
+	}
+
+	if (i == ST_RNG_FILL_FIFO_TIMEOUT)
+		return 0;
+
+	for (i = 0; i < ST_RNG_FIFO_SIZE && i < max; i += 2)
+		*(u16 *)(data + i) =
+			readl_relaxed(ddata->base + ST_RNG_DATA_REG);
+
+	return i;	/* No of bytes read */
+}
+
+static int st_rng_probe(struct platform_device *pdev)
+{
+	struct st_rng_data *ddata;
+	struct clk *clk;
+	void __iomem *base;
+	int ret;
+
+	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	ddata->ops.priv	= (unsigned long)ddata;
+	ddata->ops.read	= st_rng_read;
+	ddata->ops.name	= pdev->name;
+	ddata->base	= base;
+
+	ret = devm_hwrng_register(&pdev->dev, &ddata->ops);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register HW RNG\n");
+		return ret;
+	}
+
+	dev_info(&pdev->dev, "Successfully registered HW RNG\n");
+
+	return 0;
+}
+
+static const struct of_device_id st_rng_match[] __maybe_unused = {
+	{ .compatible = "st,rng" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, st_rng_match);
+
+static struct platform_driver st_rng_driver = {
+	.driver = {
+		.name = "st-hwrandom",
+		.of_match_table = of_match_ptr(st_rng_match),
+	},
+	.probe = st_rng_probe,
+};
+
+module_platform_driver(st_rng_driver);
+
+MODULE_AUTHOR("Pankaj Dev <pankaj.dev@st.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c
new file mode 100644
index 000000000..bc22178f8
--- /dev/null
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2015, Daniel Thompson
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+#define RNG_CR 0x00
+#define RNG_CR_RNGEN BIT(2)
+#define RNG_CR_CED BIT(5)
+
+#define RNG_SR 0x04
+#define RNG_SR_SEIS BIT(6)
+#define RNG_SR_CEIS BIT(5)
+#define RNG_SR_DRDY BIT(0)
+
+#define RNG_DR 0x08
+
+struct stm32_rng_private {
+	struct hwrng rng;
+	void __iomem *base;
+	struct clk *clk;
+	struct reset_control *rst;
+	bool ced;
+};
+
+static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
+{
+	struct stm32_rng_private *priv =
+	    container_of(rng, struct stm32_rng_private, rng);
+	u32 sr;
+	int retval = 0;
+
+	pm_runtime_get_sync((struct device *) priv->rng.priv);
+
+	while (max > sizeof(u32)) {
+		sr = readl_relaxed(priv->base + RNG_SR);
+		/* Manage timeout which is based on timer and take */
+		/* care of initial delay time when enabling rng	*/
+		if (!sr && wait) {
+			retval = readl_relaxed_poll_timeout_atomic(priv->base
+								   + RNG_SR,
+								   sr, sr,
+								   10, 50000);
+			if (retval)
+				dev_err((struct device *)priv->rng.priv,
+					"%s: timeout %x!\n", __func__, sr);
+		}
+
+		/* If error detected or data not ready... */
+		if (sr != RNG_SR_DRDY) {
+			if (WARN_ONCE(sr & (RNG_SR_SEIS | RNG_SR_CEIS),
+					"bad RNG status - %x\n", sr))
+				writel_relaxed(0, priv->base + RNG_SR);
+			break;
+		}
+
+		*(u32 *)data = readl_relaxed(priv->base + RNG_DR);
+
+		retval += sizeof(u32);
+		data += sizeof(u32);
+		max -= sizeof(u32);
+	}
+
+	pm_runtime_mark_last_busy((struct device *) priv->rng.priv);
+	pm_runtime_put_sync_autosuspend((struct device *) priv->rng.priv);
+
+	return retval || !wait ? retval : -EIO;
+}
+
+static int stm32_rng_init(struct hwrng *rng)
+{
+	struct stm32_rng_private *priv =
+	    container_of(rng, struct stm32_rng_private, rng);
+	int err;
+
+	err = clk_prepare_enable(priv->clk);
+	if (err)
+		return err;
+
+	if (priv->ced)
+		writel_relaxed(RNG_CR_RNGEN, priv->base + RNG_CR);
+	else
+		writel_relaxed(RNG_CR_RNGEN | RNG_CR_CED,
+			       priv->base + RNG_CR);
+
+	/* clear error indicators */
+	writel_relaxed(0, priv->base + RNG_SR);
+
+	return 0;
+}
+
+static void stm32_rng_cleanup(struct hwrng *rng)
+{
+	struct stm32_rng_private *priv =
+	    container_of(rng, struct stm32_rng_private, rng);
+
+	writel_relaxed(0, priv->base + RNG_CR);
+	clk_disable_unprepare(priv->clk);
+}
+
+static int stm32_rng_probe(struct platform_device *ofdev)
+{
+	struct device *dev = &ofdev->dev;
+	struct device_node *np = ofdev->dev.of_node;
+	struct stm32_rng_private *priv;
+	struct resource res;
+	int err;
+
+	priv = devm_kzalloc(dev, sizeof(struct stm32_rng_private), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	err = of_address_to_resource(np, 0, &res);
+	if (err)
+		return err;
+
+	priv->base = devm_ioremap_resource(dev, &res);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	priv->clk = devm_clk_get(&ofdev->dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	priv->rst = devm_reset_control_get(&ofdev->dev, NULL);
+	if (!IS_ERR(priv->rst)) {
+		reset_control_assert(priv->rst);
+		udelay(2);
+		reset_control_deassert(priv->rst);
+	}
+
+	priv->ced = of_property_read_bool(np, "clock-error-detect");
+
+	dev_set_drvdata(dev, priv);
+
+	priv->rng.name = dev_driver_string(dev);
+#ifndef CONFIG_PM
+	priv->rng.init = stm32_rng_init;
+	priv->rng.cleanup = stm32_rng_cleanup;
+#endif
+	priv->rng.read = stm32_rng_read;
+	priv->rng.priv = (unsigned long) dev;
+	priv->rng.quality = 900;
+
+	pm_runtime_set_autosuspend_delay(dev, 100);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_enable(dev);
+
+	return devm_hwrng_register(dev, &priv->rng);
+}
+
+static int stm32_rng_remove(struct platform_device *ofdev)
+{
+	pm_runtime_disable(&ofdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int stm32_rng_runtime_suspend(struct device *dev)
+{
+	struct stm32_rng_private *priv = dev_get_drvdata(dev);
+
+	stm32_rng_cleanup(&priv->rng);
+
+	return 0;
+}
+
+static int stm32_rng_runtime_resume(struct device *dev)
+{
+	struct stm32_rng_private *priv = dev_get_drvdata(dev);
+
+	return stm32_rng_init(&priv->rng);
+}
+#endif
+
+static const struct dev_pm_ops stm32_rng_pm_ops = {
+	SET_RUNTIME_PM_OPS(stm32_rng_runtime_suspend,
+			   stm32_rng_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
+
+static const struct of_device_id stm32_rng_match[] = {
+	{
+		.compatible = "st,stm32-rng",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, stm32_rng_match);
+
+static struct platform_driver stm32_rng_driver = {
+	.driver = {
+		.name = "stm32-rng",
+		.pm = &stm32_rng_pm_ops,
+		.of_match_table = stm32_rng_match,
+	},
+	.probe = stm32_rng_probe,
+	.remove = stm32_rng_remove,
+};
+
+module_platform_driver(stm32_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Thompson <daniel.thompson@linaro.org>");
+MODULE_DESCRIPTION("STMicroelectronics STM32 RNG device driver");
diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c
new file mode 100644
index 000000000..8ea1fc831
--- /dev/null
+++ b/drivers/char/hw_random/timeriomem-rng.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * drivers/char/hw_random/timeriomem-rng.c
+ *
+ * Copyright (C) 2009 Alexander Clouter <alex@digriz.org.uk>
+ *
+ * Derived from drivers/char/hw_random/omap-rng.c
+ *   Copyright 2005 (c) MontaVista Software, Inc.
+ *   Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Overview:
+ *   This driver is useful for platforms that have an IO range that provides
+ *   periodic random data from a single IO memory address.  All the platform
+ *   has to do is provide the address and 'wait time' that new data becomes
+ *   available.
+ *
+ * TODO: add support for reading sizes other than 32bits and masking
+ */
+
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/hrtimer.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/ktime.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/timeriomem-rng.h>
+
+struct timeriomem_rng_private {
+	void __iomem		*io_base;
+	ktime_t			period;
+	unsigned int		present:1;
+
+	struct hrtimer		timer;
+	struct completion	completion;
+
+	struct hwrng		rng_ops;
+};
+
+static int timeriomem_rng_read(struct hwrng *hwrng, void *data,
+				size_t max, bool wait)
+{
+	struct timeriomem_rng_private *priv =
+		container_of(hwrng, struct timeriomem_rng_private, rng_ops);
+	int retval = 0;
+	int period_us = ktime_to_us(priv->period);
+
+	/*
+	 * There may not have been enough time for new data to be generated
+	 * since the last request.  If the caller doesn't want to wait, let them
+	 * bail out.  Otherwise, wait for the completion.  If the new data has
+	 * already been generated, the completion should already be available.
+	 */
+	if (!wait && !priv->present)
+		return 0;
+
+	wait_for_completion(&priv->completion);
+
+	do {
+		/*
+		 * After the first read, all additional reads will need to wait
+		 * for the RNG to generate new data.  Since the period can have
+		 * a wide range of values (1us to 1s have been observed), allow
+		 * for 1% tolerance in the sleep time rather than a fixed value.
+		 */
+		if (retval > 0)
+			usleep_range(period_us,
+					period_us + max(1, period_us / 100));
+
+		*(u32 *)data = readl(priv->io_base);
+		retval += sizeof(u32);
+		data += sizeof(u32);
+		max -= sizeof(u32);
+	} while (wait && max > sizeof(u32));
+
+	/*
+	 * Block any new callers until the RNG has had time to generate new
+	 * data.
+	 */
+	priv->present = 0;
+	reinit_completion(&priv->completion);
+	hrtimer_forward_now(&priv->timer, priv->period);
+	hrtimer_restart(&priv->timer);
+
+	return retval;
+}
+
+static enum hrtimer_restart timeriomem_rng_trigger(struct hrtimer *timer)
+{
+	struct timeriomem_rng_private *priv
+		= container_of(timer, struct timeriomem_rng_private, timer);
+
+	priv->present = 1;
+	complete(&priv->completion);
+
+	return HRTIMER_NORESTART;
+}
+
+static int timeriomem_rng_probe(struct platform_device *pdev)
+{
+	struct timeriomem_rng_data *pdata = pdev->dev.platform_data;
+	struct timeriomem_rng_private *priv;
+	struct resource *res;
+	int err = 0;
+	int period;
+
+	if (!pdev->dev.of_node && !pdata) {
+		dev_err(&pdev->dev, "timeriomem_rng_data is missing\n");
+		return -EINVAL;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENXIO;
+
+	if (res->start % 4 != 0 || resource_size(res) < 4) {
+		dev_err(&pdev->dev,
+			"address must be at least four bytes wide and 32-bit aligned\n");
+		return -EINVAL;
+	}
+
+	/* Allocate memory for the device structure (and zero it) */
+	priv = devm_kzalloc(&pdev->dev,
+			sizeof(struct timeriomem_rng_private), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	if (pdev->dev.of_node) {
+		int i;
+
+		if (!of_property_read_u32(pdev->dev.of_node,
+						"period", &i))
+			period = i;
+		else {
+			dev_err(&pdev->dev, "missing period\n");
+			return -EINVAL;
+		}
+
+		if (!of_property_read_u32(pdev->dev.of_node,
+						"quality", &i))
+			priv->rng_ops.quality = i;
+		else
+			priv->rng_ops.quality = 0;
+	} else {
+		period = pdata->period;
+		priv->rng_ops.quality = pdata->quality;
+	}
+
+	priv->period = ns_to_ktime(period * NSEC_PER_USEC);
+	init_completion(&priv->completion);
+	hrtimer_init(&priv->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	priv->timer.function = timeriomem_rng_trigger;
+
+	priv->rng_ops.name = dev_name(&pdev->dev);
+	priv->rng_ops.read = timeriomem_rng_read;
+
+	priv->io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(priv->io_base)) {
+		return PTR_ERR(priv->io_base);
+	}
+
+	/* Assume random data is already available. */
+	priv->present = 1;
+	complete(&priv->completion);
+
+	err = devm_hwrng_register(&pdev->dev, &priv->rng_ops);
+	if (err) {
+		dev_err(&pdev->dev, "problem registering\n");
+		return err;
+	}
+
+	dev_info(&pdev->dev, "32bits from 0x%p @ %dus\n",
+			priv->io_base, period);
+
+	return 0;
+}
+
+static int timeriomem_rng_remove(struct platform_device *pdev)
+{
+	struct timeriomem_rng_private *priv = platform_get_drvdata(pdev);
+
+	hrtimer_cancel(&priv->timer);
+
+	return 0;
+}
+
+static const struct of_device_id timeriomem_rng_match[] = {
+	{ .compatible = "timeriomem_rng" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, timeriomem_rng_match);
+
+static struct platform_driver timeriomem_rng_driver = {
+	.driver = {
+		.name		= "timeriomem_rng",
+		.of_match_table	= timeriomem_rng_match,
+	},
+	.probe		= timeriomem_rng_probe,
+	.remove		= timeriomem_rng_remove,
+};
+
+module_platform_driver(timeriomem_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>");
+MODULE_DESCRIPTION("Timer IOMEM H/W RNG driver");
diff --git a/drivers/char/hw_random/via-rng.c b/drivers/char/hw_random/via-rng.c
new file mode 100644
index 000000000..a9a0a3b09
--- /dev/null
+++ b/drivers/char/hw_random/via-rng.c
@@ -0,0 +1,227 @@
+/*
+ * RNG driver for VIA RNGs
+ *
+ * Copyright 2005 (c) MontaVista Software, Inc.
+ *
+ * with the majority of the code coming from:
+ *
+ * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
+ * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
+ *
+ * derived from
+ *
+ * Hardware driver for the AMD 768 Random Number Generator (RNG)
+ * (c) Copyright 2001 Red Hat Inc
+ *
+ * derived from
+ *
+ * Hardware driver for Intel i810 Random Number Generator (RNG)
+ * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <crypto/padlock.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/delay.h>
+#include <asm/cpu_device_id.h>
+#include <asm/io.h>
+#include <asm/msr.h>
+#include <asm/cpufeature.h>
+#include <asm/fpu/api.h>
+
+
+
+
+enum {
+	VIA_STRFILT_CNT_SHIFT	= 16,
+	VIA_STRFILT_FAIL	= (1 << 15),
+	VIA_STRFILT_ENABLE	= (1 << 14),
+	VIA_RAWBITS_ENABLE	= (1 << 13),
+	VIA_RNG_ENABLE		= (1 << 6),
+	VIA_NOISESRC1		= (1 << 8),
+	VIA_NOISESRC2		= (1 << 9),
+	VIA_XSTORE_CNT_MASK	= 0x0F,
+
+	VIA_RNG_CHUNK_8		= 0x00,	/* 64 rand bits, 64 stored bits */
+	VIA_RNG_CHUNK_4		= 0x01,	/* 32 rand bits, 32 stored bits */
+	VIA_RNG_CHUNK_4_MASK	= 0xFFFFFFFF,
+	VIA_RNG_CHUNK_2		= 0x02,	/* 16 rand bits, 32 stored bits */
+	VIA_RNG_CHUNK_2_MASK	= 0xFFFF,
+	VIA_RNG_CHUNK_1		= 0x03,	/* 8 rand bits, 32 stored bits */
+	VIA_RNG_CHUNK_1_MASK	= 0xFF,
+};
+
+/*
+ * Investigate using the 'rep' prefix to obtain 32 bits of random data
+ * in one insn.  The upside is potentially better performance.  The
+ * downside is that the instruction becomes no longer atomic.  Due to
+ * this, just like familiar issues with /dev/random itself, the worst
+ * case of a 'rep xstore' could potentially pause a cpu for an
+ * unreasonably long time.  In practice, this condition would likely
+ * only occur when the hardware is failing.  (or so we hope :))
+ *
+ * Another possible performance boost may come from simply buffering
+ * until we have 4 bytes, thus returning a u32 at a time,
+ * instead of the current u8-at-a-time.
+ *
+ * Padlock instructions can generate a spurious DNA fault, but the
+ * kernel doesn't use CR0.TS, so this doesn't matter.
+ */
+
+static inline u32 xstore(u32 *addr, u32 edx_in)
+{
+	u32 eax_out;
+
+	asm(".byte 0x0F,0xA7,0xC0 /* xstore %%edi (addr=%0) */"
+		: "=m" (*addr), "=a" (eax_out), "+d" (edx_in), "+D" (addr));
+
+	return eax_out;
+}
+
+static int via_rng_data_present(struct hwrng *rng, int wait)
+{
+	char buf[16 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
+		((aligned(STACK_ALIGN)));
+	u32 *via_rng_datum = (u32 *)PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
+	u32 bytes_out;
+	int i;
+
+	/* We choose the recommended 1-byte-per-instruction RNG rate,
+	 * for greater randomness at the expense of speed.  Larger
+	 * values 2, 4, or 8 bytes-per-instruction yield greater
+	 * speed at lesser randomness.
+	 *
+	 * If you change this to another VIA_CHUNK_n, you must also
+	 * change the ->n_bytes values in rng_vendor_ops[] tables.
+	 * VIA_CHUNK_8 requires further code changes.
+	 *
+	 * A copy of MSR_VIA_RNG is placed in eax_out when xstore
+	 * completes.
+	 */
+
+	for (i = 0; i < 20; i++) {
+		*via_rng_datum = 0; /* paranoia, not really necessary */
+		bytes_out = xstore(via_rng_datum, VIA_RNG_CHUNK_1);
+		bytes_out &= VIA_XSTORE_CNT_MASK;
+		if (bytes_out || !wait)
+			break;
+		udelay(10);
+	}
+	rng->priv = *via_rng_datum;
+	return bytes_out ? 1 : 0;
+}
+
+static int via_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	u32 via_rng_datum = (u32)rng->priv;
+
+	*data = via_rng_datum;
+
+	return 1;
+}
+
+static int via_rng_init(struct hwrng *rng)
+{
+	struct cpuinfo_x86 *c = &cpu_data(0);
+	u32 lo, hi, old_lo;
+
+	/* VIA Nano CPUs don't have the MSR_VIA_RNG anymore.  The RNG
+	 * is always enabled if CPUID rng_en is set.  There is no
+	 * RNG configuration like it used to be the case in this
+	 * register */
+	if (((c->x86 == 6) && (c->x86_model >= 0x0f))  || (c->x86 > 6)){
+		if (!boot_cpu_has(X86_FEATURE_XSTORE_EN)) {
+			pr_err(PFX "can't enable hardware RNG "
+				"if XSTORE is not enabled\n");
+			return -ENODEV;
+		}
+		return 0;
+	}
+
+	/* Control the RNG via MSR.  Tread lightly and pay very close
+	 * attention to values written, as the reserved fields
+	 * are documented to be "undefined and unpredictable"; but it
+	 * does not say to write them as zero, so I make a guess that
+	 * we restore the values we find in the register.
+	 */
+	rdmsr(MSR_VIA_RNG, lo, hi);
+
+	old_lo = lo;
+	lo &= ~(0x7f << VIA_STRFILT_CNT_SHIFT);
+	lo &= ~VIA_XSTORE_CNT_MASK;
+	lo &= ~(VIA_STRFILT_ENABLE | VIA_STRFILT_FAIL | VIA_RAWBITS_ENABLE);
+	lo |= VIA_RNG_ENABLE;
+	lo |= VIA_NOISESRC1;
+
+	/* Enable secondary noise source on CPUs where it is present. */
+
+	/* Nehemiah stepping 8 and higher */
+	if ((c->x86_model == 9) && (c->x86_stepping > 7))
+		lo |= VIA_NOISESRC2;
+
+	/* Esther */
+	if (c->x86_model >= 10)
+		lo |= VIA_NOISESRC2;
+
+	if (lo != old_lo)
+		wrmsr(MSR_VIA_RNG, lo, hi);
+
+	/* perhaps-unnecessary sanity check; remove after testing if
+	   unneeded */
+	rdmsr(MSR_VIA_RNG, lo, hi);
+	if ((lo & VIA_RNG_ENABLE) == 0) {
+		pr_err(PFX "cannot enable VIA C3 RNG, aborting\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+
+static struct hwrng via_rng = {
+	.name		= "via",
+	.init		= via_rng_init,
+	.data_present	= via_rng_data_present,
+	.data_read	= via_rng_data_read,
+};
+
+
+static int __init via_rng_mod_init(void)
+{
+	int err;
+
+	if (!boot_cpu_has(X86_FEATURE_XSTORE))
+		return -ENODEV;
+
+	pr_info("VIA RNG detected\n");
+	err = hwrng_register(&via_rng);
+	if (err) {
+		pr_err(PFX "RNG registering failed (%d)\n",
+		       err);
+		goto out;
+	}
+out:
+	return err;
+}
+module_init(via_rng_mod_init);
+
+static void __exit via_rng_mod_exit(void)
+{
+	hwrng_unregister(&via_rng);
+}
+module_exit(via_rng_mod_exit);
+
+static struct x86_cpu_id __maybe_unused via_rng_cpu_id[] = {
+	X86_MATCH_FEATURE(X86_FEATURE_XSTORE, NULL),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, via_rng_cpu_id);
+
+MODULE_DESCRIPTION("H/W RNG driver for VIA CPU with PadLock");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
new file mode 100644
index 000000000..353041173
--- /dev/null
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Randomness driver for virtio
+ *  Copyright (C) 2007, 2008 Rusty Russell IBM Corporation
+ */
+
+#include <asm/barrier.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/scatterlist.h>
+#include <linux/spinlock.h>
+#include <linux/virtio.h>
+#include <linux/virtio_rng.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+static DEFINE_IDA(rng_index_ida);
+
+struct virtrng_info {
+	struct hwrng hwrng;
+	struct virtqueue *vq;
+	char name[25];
+	int index;
+	bool hwrng_register_done;
+	bool hwrng_removed;
+	/* data transfer */
+	struct completion have_data;
+	unsigned int data_avail;
+	unsigned int data_idx;
+	/* minimal size returned by rng_buffer_size() */
+#if SMP_CACHE_BYTES < 32
+	u8 data[32];
+#else
+	u8 data[SMP_CACHE_BYTES];
+#endif
+};
+
+static void random_recv_done(struct virtqueue *vq)
+{
+	struct virtrng_info *vi = vq->vdev->priv;
+	unsigned int len;
+
+	/* We can get spurious callbacks, e.g. shared IRQs + virtio_pci. */
+	if (!virtqueue_get_buf(vi->vq, &len))
+		return;
+
+	smp_store_release(&vi->data_avail, len);
+	complete(&vi->have_data);
+}
+
+static void request_entropy(struct virtrng_info *vi)
+{
+	struct scatterlist sg;
+
+	reinit_completion(&vi->have_data);
+	vi->data_idx = 0;
+
+	sg_init_one(&sg, vi->data, sizeof(vi->data));
+
+	/* There should always be room for one buffer. */
+	virtqueue_add_inbuf(vi->vq, &sg, 1, vi->data, GFP_KERNEL);
+
+	virtqueue_kick(vi->vq);
+}
+
+static unsigned int copy_data(struct virtrng_info *vi, void *buf,
+			      unsigned int size)
+{
+	size = min_t(unsigned int, size, vi->data_avail);
+	memcpy(buf, vi->data + vi->data_idx, size);
+	vi->data_idx += size;
+	vi->data_avail -= size;
+	if (vi->data_avail == 0)
+		request_entropy(vi);
+	return size;
+}
+
+static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait)
+{
+	int ret;
+	struct virtrng_info *vi = (struct virtrng_info *)rng->priv;
+	unsigned int chunk;
+	size_t read;
+
+	if (vi->hwrng_removed)
+		return -ENODEV;
+
+	read = 0;
+
+	/* copy available data */
+	if (smp_load_acquire(&vi->data_avail)) {
+		chunk = copy_data(vi, buf, size);
+		size -= chunk;
+		read += chunk;
+	}
+
+	if (!wait)
+		return read;
+
+	/* We have already copied available entropy,
+	 * so either size is 0 or data_avail is 0
+	 */
+	while (size != 0) {
+		/* data_avail is 0 but a request is pending */
+		ret = wait_for_completion_killable(&vi->have_data);
+		if (ret < 0)
+			return ret;
+		/* if vi->data_avail is 0, we have been interrupted
+		 * by a cleanup, but buffer stays in the queue
+		 */
+		if (vi->data_avail == 0)
+			return read;
+
+		chunk = copy_data(vi, buf + read, size);
+		size -= chunk;
+		read += chunk;
+	}
+
+	return read;
+}
+
+static void virtio_cleanup(struct hwrng *rng)
+{
+	struct virtrng_info *vi = (struct virtrng_info *)rng->priv;
+
+	complete(&vi->have_data);
+}
+
+static int probe_common(struct virtio_device *vdev)
+{
+	int err, index;
+	struct virtrng_info *vi = NULL;
+
+	vi = kzalloc(sizeof(struct virtrng_info), GFP_KERNEL);
+	if (!vi)
+		return -ENOMEM;
+
+	vi->index = index = ida_simple_get(&rng_index_ida, 0, 0, GFP_KERNEL);
+	if (index < 0) {
+		err = index;
+		goto err_ida;
+	}
+	sprintf(vi->name, "virtio_rng.%d", index);
+	init_completion(&vi->have_data);
+
+	vi->hwrng = (struct hwrng) {
+		.read = virtio_read,
+		.cleanup = virtio_cleanup,
+		.priv = (unsigned long)vi,
+		.name = vi->name,
+		.quality = 1000,
+	};
+	vdev->priv = vi;
+
+	/* We expect a single virtqueue. */
+	vi->vq = virtio_find_single_vq(vdev, random_recv_done, "input");
+	if (IS_ERR(vi->vq)) {
+		err = PTR_ERR(vi->vq);
+		goto err_find;
+	}
+
+	virtio_device_ready(vdev);
+
+	/* we always have a pending entropy request */
+	request_entropy(vi);
+
+	return 0;
+
+err_find:
+	ida_simple_remove(&rng_index_ida, index);
+err_ida:
+	kfree(vi);
+	return err;
+}
+
+static void remove_common(struct virtio_device *vdev)
+{
+	struct virtrng_info *vi = vdev->priv;
+
+	vi->hwrng_removed = true;
+	vi->data_avail = 0;
+	vi->data_idx = 0;
+	complete(&vi->have_data);
+	if (vi->hwrng_register_done)
+		hwrng_unregister(&vi->hwrng);
+	virtio_reset_device(vdev);
+	vdev->config->del_vqs(vdev);
+	ida_simple_remove(&rng_index_ida, vi->index);
+	kfree(vi);
+}
+
+static int virtrng_probe(struct virtio_device *vdev)
+{
+	return probe_common(vdev);
+}
+
+static void virtrng_remove(struct virtio_device *vdev)
+{
+	remove_common(vdev);
+}
+
+static void virtrng_scan(struct virtio_device *vdev)
+{
+	struct virtrng_info *vi = vdev->priv;
+	int err;
+
+	err = hwrng_register(&vi->hwrng);
+	if (!err)
+		vi->hwrng_register_done = true;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int virtrng_freeze(struct virtio_device *vdev)
+{
+	remove_common(vdev);
+	return 0;
+}
+
+static int virtrng_restore(struct virtio_device *vdev)
+{
+	int err;
+
+	err = probe_common(vdev);
+	if (!err) {
+		struct virtrng_info *vi = vdev->priv;
+
+		/*
+		 * Set hwrng_removed to ensure that virtio_read()
+		 * does not block waiting for data before the
+		 * registration is complete.
+		 */
+		vi->hwrng_removed = true;
+		err = hwrng_register(&vi->hwrng);
+		if (!err) {
+			vi->hwrng_register_done = true;
+			vi->hwrng_removed = false;
+		}
+	}
+
+	return err;
+}
+#endif
+
+static const struct virtio_device_id id_table[] = {
+	{ VIRTIO_ID_RNG, VIRTIO_DEV_ANY_ID },
+	{ 0 },
+};
+
+static struct virtio_driver virtio_rng_driver = {
+	.driver.name =	KBUILD_MODNAME,
+	.driver.owner =	THIS_MODULE,
+	.id_table =	id_table,
+	.probe =	virtrng_probe,
+	.remove =	virtrng_remove,
+	.scan =		virtrng_scan,
+#ifdef CONFIG_PM_SLEEP
+	.freeze =	virtrng_freeze,
+	.restore =	virtrng_restore,
+#endif
+};
+
+module_virtio_driver(virtio_rng_driver);
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio random number driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/xgene-rng.c b/drivers/char/hw_random/xgene-rng.c
new file mode 100644
index 000000000..008e6db9c
--- /dev/null
+++ b/drivers/char/hw_random/xgene-rng.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * APM X-Gene SoC RNG Driver
+ *
+ * Copyright (c) 2014, Applied Micro Circuits Corporation
+ * Author: Rameshwar Prasad Sahu <rsahu@apm.com>
+ *	   Shamal Winchurkar <swinchurkar@apm.com>
+ *	   Feng Kan <fkan@apm.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/hw_random.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/timer.h>
+
+#define RNG_MAX_DATUM			4
+#define MAX_TRY				100
+#define XGENE_RNG_RETRY_COUNT		20
+#define XGENE_RNG_RETRY_INTERVAL	10
+
+/* RNG  Registers */
+#define RNG_INOUT_0			0x00
+#define RNG_INTR_STS_ACK		0x10
+#define RNG_CONTROL			0x14
+#define RNG_CONFIG			0x18
+#define RNG_ALARMCNT			0x1c
+#define RNG_FROENABLE			0x20
+#define RNG_FRODETUNE			0x24
+#define RNG_ALARMMASK			0x28
+#define RNG_ALARMSTOP			0x2c
+#define RNG_OPTIONS			0x78
+#define RNG_EIP_REV			0x7c
+
+#define MONOBIT_FAIL_MASK		BIT(7)
+#define POKER_FAIL_MASK			BIT(6)
+#define LONG_RUN_FAIL_MASK		BIT(5)
+#define RUN_FAIL_MASK			BIT(4)
+#define NOISE_FAIL_MASK			BIT(3)
+#define STUCK_OUT_MASK			BIT(2)
+#define SHUTDOWN_OFLO_MASK		BIT(1)
+#define READY_MASK			BIT(0)
+
+#define MAJOR_HW_REV_RD(src)		(((src) & 0x0f000000) >> 24)
+#define MINOR_HW_REV_RD(src)		(((src) & 0x00f00000) >> 20)
+#define HW_PATCH_LEVEL_RD(src)		(((src) & 0x000f0000) >> 16)
+#define MAX_REFILL_CYCLES_SET(dst, src) \
+			((dst & ~0xffff0000) | (((u32)src << 16) & 0xffff0000))
+#define MIN_REFILL_CYCLES_SET(dst, src) \
+			((dst & ~0x000000ff) | (((u32)src) & 0x000000ff))
+#define ALARM_THRESHOLD_SET(dst, src) \
+			((dst & ~0x000000ff) | (((u32)src) & 0x000000ff))
+#define ENABLE_RNG_SET(dst, src) \
+			((dst & ~BIT(10)) | (((u32)src << 10) & BIT(10)))
+#define REGSPEC_TEST_MODE_SET(dst, src) \
+			((dst & ~BIT(8)) | (((u32)src << 8) & BIT(8)))
+#define MONOBIT_FAIL_MASK_SET(dst, src) \
+			((dst & ~BIT(7)) | (((u32)src << 7) & BIT(7)))
+#define POKER_FAIL_MASK_SET(dst, src) \
+			((dst & ~BIT(6)) | (((u32)src << 6) & BIT(6)))
+#define LONG_RUN_FAIL_MASK_SET(dst, src) \
+			((dst & ~BIT(5)) | (((u32)src << 5) & BIT(5)))
+#define RUN_FAIL_MASK_SET(dst, src) \
+			((dst & ~BIT(4)) | (((u32)src << 4) & BIT(4)))
+#define NOISE_FAIL_MASK_SET(dst, src) \
+			((dst & ~BIT(3)) | (((u32)src << 3) & BIT(3)))
+#define STUCK_OUT_MASK_SET(dst, src) \
+			((dst & ~BIT(2)) | (((u32)src << 2) & BIT(2)))
+#define SHUTDOWN_OFLO_MASK_SET(dst, src) \
+			((dst & ~BIT(1)) | (((u32)src << 1) & BIT(1)))
+
+struct xgene_rng_dev {
+	u32 irq;
+	void  __iomem *csr_base;
+	u32 revision;
+	u32 datum_size;
+	u32 failure_cnt;	/* Failure count last minute */
+	unsigned long failure_ts;/* First failure timestamp */
+	struct timer_list failure_timer;
+	struct device *dev;
+	struct clk *clk;
+};
+
+static void xgene_rng_expired_timer(struct timer_list *t)
+{
+	struct xgene_rng_dev *ctx = from_timer(ctx, t, failure_timer);
+
+	/* Clear failure counter as timer expired */
+	disable_irq(ctx->irq);
+	ctx->failure_cnt = 0;
+	del_timer(&ctx->failure_timer);
+	enable_irq(ctx->irq);
+}
+
+static void xgene_rng_start_timer(struct xgene_rng_dev *ctx)
+{
+	ctx->failure_timer.expires = jiffies + 120 * HZ;
+	add_timer(&ctx->failure_timer);
+}
+
+/*
+ * Initialize or reinit free running oscillators (FROs)
+ */
+static void xgene_rng_init_fro(struct xgene_rng_dev *ctx, u32 fro_val)
+{
+	writel(fro_val, ctx->csr_base + RNG_FRODETUNE);
+	writel(0x00000000, ctx->csr_base + RNG_ALARMMASK);
+	writel(0x00000000, ctx->csr_base + RNG_ALARMSTOP);
+	writel(0xFFFFFFFF, ctx->csr_base + RNG_FROENABLE);
+}
+
+static void xgene_rng_chk_overflow(struct xgene_rng_dev *ctx)
+{
+	u32 val;
+
+	val = readl(ctx->csr_base + RNG_INTR_STS_ACK);
+	if (val & MONOBIT_FAIL_MASK)
+		/*
+		 * LFSR detected an out-of-bounds number of 1s after
+		 * checking 20,000 bits (test T1 as specified in the
+		 * AIS-31 standard)
+		 */
+		dev_err(ctx->dev, "test monobit failure error 0x%08X\n", val);
+	if (val & POKER_FAIL_MASK)
+		/*
+		 * LFSR detected an out-of-bounds value in at least one
+		 * of the 16 poker_count_X counters or an out of bounds sum
+		 * of squares value after checking 20,000 bits (test T2 as
+		 * specified in the AIS-31 standard)
+		 */
+		dev_err(ctx->dev, "test poker failure error 0x%08X\n", val);
+	if (val & LONG_RUN_FAIL_MASK)
+		/*
+		 * LFSR detected a sequence of 34 identical bits
+		 * (test T4 as specified in the AIS-31 standard)
+		 */
+		dev_err(ctx->dev, "test long run failure error 0x%08X\n", val);
+	if (val & RUN_FAIL_MASK)
+		/*
+		 * LFSR detected an outof-bounds value for at least one
+		 * of the running counters after checking 20,000 bits
+		 * (test T3 as specified in the AIS-31 standard)
+		 */
+		dev_err(ctx->dev, "test run failure error 0x%08X\n", val);
+	if (val & NOISE_FAIL_MASK)
+		/* LFSR detected a sequence of 48 identical bits */
+		dev_err(ctx->dev, "noise failure error 0x%08X\n", val);
+	if (val & STUCK_OUT_MASK)
+		/*
+		 * Detected output data registers generated same value twice
+		 * in a row
+		 */
+		dev_err(ctx->dev, "stuck out failure error 0x%08X\n", val);
+
+	if (val & SHUTDOWN_OFLO_MASK) {
+		u32 frostopped;
+
+		/* FROs shut down after a second error event. Try recover. */
+		if (++ctx->failure_cnt == 1) {
+			/* 1st time, just recover */
+			ctx->failure_ts = jiffies;
+			frostopped = readl(ctx->csr_base + RNG_ALARMSTOP);
+			xgene_rng_init_fro(ctx, frostopped);
+
+			/*
+			 * We must start a timer to clear out this error
+			 * in case the system timer wrap around
+			 */
+			xgene_rng_start_timer(ctx);
+		} else {
+			/* 2nd time failure in lesser than 1 minute? */
+			if (time_after(ctx->failure_ts + 60 * HZ, jiffies)) {
+				dev_err(ctx->dev,
+					"FRO shutdown failure error 0x%08X\n",
+					val);
+			} else {
+				/* 2nd time failure after 1 minutes, recover */
+				ctx->failure_ts = jiffies;
+				ctx->failure_cnt = 1;
+				/*
+				 * We must start a timer to clear out this
+				 * error in case the system timer wrap
+				 * around
+				 */
+				xgene_rng_start_timer(ctx);
+			}
+			frostopped = readl(ctx->csr_base + RNG_ALARMSTOP);
+			xgene_rng_init_fro(ctx, frostopped);
+		}
+	}
+	/* Clear them all */
+	writel(val, ctx->csr_base + RNG_INTR_STS_ACK);
+}
+
+static irqreturn_t xgene_rng_irq_handler(int irq, void *id)
+{
+	struct xgene_rng_dev *ctx = (struct xgene_rng_dev *) id;
+
+	/* RNG Alarm Counter overflow */
+	xgene_rng_chk_overflow(ctx);
+
+	return IRQ_HANDLED;
+}
+
+static int xgene_rng_data_present(struct hwrng *rng, int wait)
+{
+	struct xgene_rng_dev *ctx = (struct xgene_rng_dev *) rng->priv;
+	u32 i, val = 0;
+
+	for (i = 0; i < XGENE_RNG_RETRY_COUNT; i++) {
+		val = readl(ctx->csr_base + RNG_INTR_STS_ACK);
+		if ((val & READY_MASK) || !wait)
+			break;
+		udelay(XGENE_RNG_RETRY_INTERVAL);
+	}
+
+	return (val & READY_MASK);
+}
+
+static int xgene_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	struct xgene_rng_dev *ctx = (struct xgene_rng_dev *) rng->priv;
+	int i;
+
+	for (i = 0; i < ctx->datum_size; i++)
+		data[i] = readl(ctx->csr_base + RNG_INOUT_0 + i * 4);
+
+	/* Clear ready bit to start next transaction */
+	writel(READY_MASK, ctx->csr_base + RNG_INTR_STS_ACK);
+
+	return ctx->datum_size << 2;
+}
+
+static void xgene_rng_init_internal(struct xgene_rng_dev *ctx)
+{
+	u32 val;
+
+	writel(0x00000000, ctx->csr_base + RNG_CONTROL);
+
+	val = MAX_REFILL_CYCLES_SET(0, 10);
+	val = MIN_REFILL_CYCLES_SET(val, 10);
+	writel(val, ctx->csr_base + RNG_CONFIG);
+
+	val = ALARM_THRESHOLD_SET(0, 0xFF);
+	writel(val, ctx->csr_base + RNG_ALARMCNT);
+
+	xgene_rng_init_fro(ctx, 0);
+
+	writel(MONOBIT_FAIL_MASK |
+		POKER_FAIL_MASK	|
+		LONG_RUN_FAIL_MASK |
+		RUN_FAIL_MASK |
+		NOISE_FAIL_MASK |
+		STUCK_OUT_MASK |
+		SHUTDOWN_OFLO_MASK |
+		READY_MASK, ctx->csr_base + RNG_INTR_STS_ACK);
+
+	val = ENABLE_RNG_SET(0, 1);
+	val = MONOBIT_FAIL_MASK_SET(val, 1);
+	val = POKER_FAIL_MASK_SET(val, 1);
+	val = LONG_RUN_FAIL_MASK_SET(val, 1);
+	val = RUN_FAIL_MASK_SET(val, 1);
+	val = NOISE_FAIL_MASK_SET(val, 1);
+	val = STUCK_OUT_MASK_SET(val, 1);
+	val = SHUTDOWN_OFLO_MASK_SET(val, 1);
+	writel(val, ctx->csr_base + RNG_CONTROL);
+}
+
+static int xgene_rng_init(struct hwrng *rng)
+{
+	struct xgene_rng_dev *ctx = (struct xgene_rng_dev *) rng->priv;
+
+	ctx->failure_cnt = 0;
+	timer_setup(&ctx->failure_timer, xgene_rng_expired_timer, 0);
+
+	ctx->revision = readl(ctx->csr_base + RNG_EIP_REV);
+
+	dev_dbg(ctx->dev, "Rev %d.%d.%d\n",
+		MAJOR_HW_REV_RD(ctx->revision),
+		MINOR_HW_REV_RD(ctx->revision),
+		HW_PATCH_LEVEL_RD(ctx->revision));
+
+	dev_dbg(ctx->dev, "Options 0x%08X",
+		readl(ctx->csr_base + RNG_OPTIONS));
+
+	xgene_rng_init_internal(ctx);
+
+	ctx->datum_size = RNG_MAX_DATUM;
+
+	return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_rng_acpi_match[] = {
+	{ "APMC0D18", },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, xgene_rng_acpi_match);
+#endif
+
+static struct hwrng xgene_rng_func = {
+	.name		= "xgene-rng",
+	.init		= xgene_rng_init,
+	.data_present	= xgene_rng_data_present,
+	.data_read	= xgene_rng_data_read,
+};
+
+static int xgene_rng_probe(struct platform_device *pdev)
+{
+	struct xgene_rng_dev *ctx;
+	int rc = 0;
+
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->dev = &pdev->dev;
+	platform_set_drvdata(pdev, ctx);
+
+	ctx->csr_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(ctx->csr_base))
+		return PTR_ERR(ctx->csr_base);
+
+	rc = platform_get_irq(pdev, 0);
+	if (rc < 0)
+		return rc;
+	ctx->irq = rc;
+
+	dev_dbg(&pdev->dev, "APM X-Gene RNG BASE %p ALARM IRQ %d",
+		ctx->csr_base, ctx->irq);
+
+	rc = devm_request_irq(&pdev->dev, ctx->irq, xgene_rng_irq_handler, 0,
+				dev_name(&pdev->dev), ctx);
+	if (rc) {
+		dev_err(&pdev->dev, "Could not request RNG alarm IRQ\n");
+		return rc;
+	}
+
+	/* Enable IP clock */
+	ctx->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(ctx->clk)) {
+		dev_warn(&pdev->dev, "Couldn't get the clock for RNG\n");
+	} else {
+		rc = clk_prepare_enable(ctx->clk);
+		if (rc) {
+			dev_warn(&pdev->dev,
+				 "clock prepare enable failed for RNG");
+			return rc;
+		}
+	}
+
+	xgene_rng_func.priv = (unsigned long) ctx;
+
+	rc = devm_hwrng_register(&pdev->dev, &xgene_rng_func);
+	if (rc) {
+		dev_err(&pdev->dev, "RNG registering failed error %d\n", rc);
+		if (!IS_ERR(ctx->clk))
+			clk_disable_unprepare(ctx->clk);
+		return rc;
+	}
+
+	rc = device_init_wakeup(&pdev->dev, 1);
+	if (rc) {
+		dev_err(&pdev->dev, "RNG device_init_wakeup failed error %d\n",
+			rc);
+		if (!IS_ERR(ctx->clk))
+			clk_disable_unprepare(ctx->clk);
+		return rc;
+	}
+
+	return 0;
+}
+
+static int xgene_rng_remove(struct platform_device *pdev)
+{
+	struct xgene_rng_dev *ctx = platform_get_drvdata(pdev);
+	int rc;
+
+	rc = device_init_wakeup(&pdev->dev, 0);
+	if (rc)
+		dev_err(&pdev->dev, "RNG init wakeup failed error %d\n", rc);
+	if (!IS_ERR(ctx->clk))
+		clk_disable_unprepare(ctx->clk);
+
+	return rc;
+}
+
+static const struct of_device_id xgene_rng_of_match[] = {
+	{ .compatible = "apm,xgene-rng" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, xgene_rng_of_match);
+
+static struct platform_driver xgene_rng_driver = {
+	.probe = xgene_rng_probe,
+	.remove	= xgene_rng_remove,
+	.driver = {
+		.name		= "xgene-rng",
+		.of_match_table = xgene_rng_of_match,
+		.acpi_match_table = ACPI_PTR(xgene_rng_acpi_match),
+	},
+};
+
+module_platform_driver(xgene_rng_driver);
+MODULE_DESCRIPTION("APM X-Gene RNG driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/xiphera-trng.c b/drivers/char/hw_random/xiphera-trng.c
new file mode 100644
index 000000000..2a9fea72b
--- /dev/null
+++ b/drivers/char/hw_random/xiphera-trng.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2020 Xiphera Ltd. */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/hw_random.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#define CONTROL_REG			0x00000000
+#define STATUS_REG			0x00000004
+#define RAND_REG			0x00000000
+
+#define HOST_TO_TRNG_RESET		0x00000001
+#define HOST_TO_TRNG_RELEASE_RESET	0x00000002
+#define HOST_TO_TRNG_ENABLE		0x80000000
+#define HOST_TO_TRNG_ZEROIZE		0x80000004
+#define HOST_TO_TRNG_ACK_ZEROIZE	0x80000008
+#define HOST_TO_TRNG_READ		0x8000000F
+
+/* trng statuses */
+#define TRNG_ACK_RESET			0x000000AC
+#define TRNG_SUCCESSFUL_STARTUP		0x00000057
+#define TRNG_FAILED_STARTUP		0x000000FA
+#define TRNG_NEW_RAND_AVAILABLE		0x000000ED
+
+struct xiphera_trng {
+	void __iomem *mem;
+	struct hwrng rng;
+};
+
+static int xiphera_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct xiphera_trng *trng = container_of(rng, struct xiphera_trng, rng);
+	int ret = 0;
+
+	while (max >= sizeof(u32)) {
+		/* check for data */
+		if (readl(trng->mem + STATUS_REG) == TRNG_NEW_RAND_AVAILABLE) {
+			*(u32 *)buf = readl(trng->mem + RAND_REG);
+			/*
+			 * Inform the trng of the read
+			 * and re-enable it to produce a new random number
+			 */
+			writel(HOST_TO_TRNG_READ, trng->mem + CONTROL_REG);
+			writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);
+			ret += sizeof(u32);
+			buf += sizeof(u32);
+			max -= sizeof(u32);
+		} else {
+			break;
+		}
+	}
+	return ret;
+}
+
+static int xiphera_trng_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct xiphera_trng *trng;
+	struct device *dev = &pdev->dev;
+
+	trng = devm_kzalloc(dev, sizeof(*trng), GFP_KERNEL);
+	if (!trng)
+		return -ENOMEM;
+
+	trng->mem = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(trng->mem))
+		return PTR_ERR(trng->mem);
+
+	/*
+	 * the trng needs to be reset first which might not happen in time,
+	 * hence we incorporate a small delay to ensure proper behaviour
+	 */
+	writel(HOST_TO_TRNG_RESET, trng->mem + CONTROL_REG);
+	usleep_range(100, 200);
+
+	if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {
+		/*
+		 * there is a small chance the trng is just not ready yet,
+		 * so we try one more time. If the second time fails, we give up
+		 */
+		usleep_range(100, 200);
+		if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {
+			dev_err(dev, "failed to reset the trng ip\n");
+			return -ENODEV;
+		}
+	}
+
+	/*
+	 * once again, to ensure proper behaviour we sleep
+	 * for a while after zeroizing the trng
+	 */
+	writel(HOST_TO_TRNG_RELEASE_RESET, trng->mem + CONTROL_REG);
+	writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);
+	writel(HOST_TO_TRNG_ZEROIZE, trng->mem + CONTROL_REG);
+	msleep(20);
+
+	if (readl(trng->mem + STATUS_REG) != TRNG_SUCCESSFUL_STARTUP) {
+		/* diagnose the reason for the failure */
+		if (readl(trng->mem + STATUS_REG) == TRNG_FAILED_STARTUP) {
+			dev_err(dev, "trng ip startup-tests failed\n");
+			return -ENODEV;
+		}
+		dev_err(dev, "startup-tests yielded no response\n");
+		return -ENODEV;
+	}
+
+	writel(HOST_TO_TRNG_ACK_ZEROIZE, trng->mem + CONTROL_REG);
+
+	trng->rng.name = pdev->name;
+	trng->rng.read = xiphera_trng_read;
+	trng->rng.quality = 900;
+
+	ret = devm_hwrng_register(dev, &trng->rng);
+	if (ret) {
+		dev_err(dev, "failed to register rng device: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, trng);
+
+	return 0;
+}
+
+static const struct of_device_id xiphera_trng_of_match[] = {
+	{ .compatible = "xiphera,xip8001b-trng", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xiphera_trng_of_match);
+
+static struct platform_driver xiphera_trng_driver = {
+	.driver = {
+		.name = "xiphera-trng",
+		.of_match_table	= xiphera_trng_of_match,
+	},
+	.probe = xiphera_trng_probe,
+};
+
+module_platform_driver(xiphera_trng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Atte Tommiska");
+MODULE_DESCRIPTION("Xiphera FPGA-based true random number generator driver");