3 files changed, 202 insertions, 0 deletions
diff --git a/arch/nios2/platform/Kconfig.platform b/arch/nios2/platform/Kconfig.platform
new file mode 100644
index 0000000000..e849daff6f
--- /dev/null
+++ b/arch/nios2/platform/Kconfig.platform
@@ -0,0 +1,148 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "Platform options"
+
+comment "Memory settings"
+
+config NIOS2_MEM_BASE
+	hex "Memory base address"
+	default "0x00000000"
+	help
+	  This is the physical address of the memory that the kernel will run
+	  from. This address is used to link the kernel and setup initial memory
+	  management. You should take the raw memory address without any MMU
+	  or cache bits set.
+	  Please not that this address is used directly so you have to manually
+	  do address translation if it's connected to a bridge.
+
+comment "Device tree"
+
+config NIOS2_DTB_AT_PHYS_ADDR
+	bool "DTB at physical address"
+	help
+	  When enabled you can select a physical address to load the dtb from.
+	  Normally this address is passed by a bootloader such as u-boot but
+	  using this you can use a devicetree without a bootloader.
+	  This way you can store a devicetree in NOR flash or an onchip rom.
+	  Please note that this address is used directly so you have to manually
+	  do address translation if it's connected to a bridge. Also take into
+	  account that when using an MMU you'd have to ad 0xC0000000 to your
+	  address
+
+config NIOS2_DTB_PHYS_ADDR
+	hex "DTB Address"
+	depends on NIOS2_DTB_AT_PHYS_ADDR
+	default "0xC0000000"
+	help
+	  Physical address of a dtb blob.
+
+config NIOS2_DTB_SOURCE_BOOL
+	bool "Compile and link device tree into kernel image"
+	depends on !COMPILE_TEST
+	help
+	  This allows you to specify a dts (device tree source) file
+	  which will be compiled and linked into the kernel image.
+
+config NIOS2_DTB_SOURCE
+	string "Device tree source file"
+	depends on NIOS2_DTB_SOURCE_BOOL
+	default ""
+	help
+	  Absolute path to the device tree source (dts) file describing your
+	  system.
+
+comment "Nios II instructions"
+
+config NIOS2_ARCH_REVISION
+	int "Select Nios II architecture revision"
+	range 1 2
+	default 1
+	help
+	  Select between Nios II R1 and Nios II R2 . The architectures
+	  are binary incompatible. Default is R1 .
+
+config NIOS2_HW_MUL_SUPPORT
+	bool "Enable MUL instruction"
+	help
+	  Set to true if you configured the Nios II to include the MUL
+	  instruction.  This will enable the -mhw-mul compiler flag.
+
+config NIOS2_HW_MULX_SUPPORT
+	bool "Enable MULX instruction"
+	help
+	  Set to true if you configured the Nios II to include the MULX
+	  instruction.  Enables the -mhw-mulx compiler flag.
+
+config NIOS2_HW_DIV_SUPPORT
+	bool "Enable DIV instruction"
+	help
+	  Set to true if you configured the Nios II to include the DIV
+	  instruction.  Enables the -mhw-div compiler flag.
+
+config NIOS2_BMX_SUPPORT
+	bool "Enable BMX instructions"
+	depends on NIOS2_ARCH_REVISION = 2
+	help
+	  Set to true if you configured the Nios II R2 to include
+	  the BMX Bit Manipulation Extension instructions. Enables
+	  the -mbmx compiler flag.
+
+config NIOS2_CDX_SUPPORT
+	bool "Enable CDX instructions"
+	depends on NIOS2_ARCH_REVISION = 2
+	help
+	  Set to true if you configured the Nios II R2 to include
+	  the CDX Bit Manipulation Extension instructions. Enables
+	  the -mcdx compiler flag.
+
+config NIOS2_FPU_SUPPORT
+	bool "Custom floating point instr support"
+	help
+	  Enables the -mcustom-fpu-cfg=60-1 compiler flag.
+
+config NIOS2_CI_SWAB_SUPPORT
+	bool "Byteswap custom instruction"
+	help
+	  Use the byteswap (endian converter) Nios II custom instruction provided
+	  by Altera and which can be enabled in QSYS builder. This accelerates
+	  endian conversions in the kernel (e.g. ntohs).
+
+config NIOS2_CI_SWAB_NO
+	int "Byteswap custom instruction number" if NIOS2_CI_SWAB_SUPPORT
+	default 0
+	help
+	  Number of the instruction as configured in QSYS Builder.
+
+comment "Cache settings"
+
+config CUSTOM_CACHE_SETTINGS
+	bool "Custom cache settings"
+	help
+	  This option allows you to tweak the cache settings used during early
+	  boot (where the information from device tree is not yet available).
+	  There should be no reason to change these values. Linux will work
+	  perfectly fine, even if the Nios II is configured with smaller caches.
+
+	  Say N here unless you know what you are doing.
+
+config NIOS2_DCACHE_SIZE
+	hex "D-Cache size" if CUSTOM_CACHE_SETTINGS
+	range 0x200 0x10000
+	default "0x800"
+	help
+	  Maximum possible data cache size.
+
+config NIOS2_DCACHE_LINE_SIZE
+	hex "D-Cache line size" if CUSTOM_CACHE_SETTINGS
+	range 0x10 0x20
+	default "0x20"
+	help
+	  Minimum possible data cache line size.
+
+config NIOS2_ICACHE_SIZE
+	hex "I-Cache size" if CUSTOM_CACHE_SETTINGS
+	range 0x200 0x10000
+	default "0x1000"
+	help
+	  Maximum possible instruction cache size.
+
+endmenu
diff --git a/arch/nios2/platform/Makefile b/arch/nios2/platform/Makefile
new file mode 100644
index 0000000000..fb5bdb44c1
--- /dev/null
+++ b/arch/nios2/platform/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y += platform.o
diff --git a/arch/nios2/platform/platform.c b/arch/nios2/platform/platform.c
new file mode 100644
index 0000000000..9737a87121
--- /dev/null
+++ b/arch/nios2/platform/platform.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ * Copyright (C) 2011 Thomas Chou
+ * Copyright (C) 2011 Walter Goossens
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of_fdt.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+#include <linux/io.h>
+#include <linux/clk-provider.h>
+
+static const struct of_device_id clk_match[] __initconst = {
+	{ .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
+	{}
+};
+
+static int __init nios2_soc_device_init(void)
+{
+	struct soc_device *soc_dev;
+	struct soc_device_attribute *soc_dev_attr;
+	const char *machine;
+
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (soc_dev_attr) {
+		machine = of_flat_dt_get_machine_name();
+		if (machine)
+			soc_dev_attr->machine = kasprintf(GFP_KERNEL, "%s",
+						machine);
+
+		soc_dev_attr->family = "Nios II";
+
+		soc_dev = soc_device_register(soc_dev_attr);
+		if (IS_ERR(soc_dev)) {
+			kfree(soc_dev_attr->machine);
+			kfree(soc_dev_attr);
+		}
+	}
+
+	of_clk_init(clk_match);
+
+	return 0;
+}
+
+device_initcall(nios2_soc_device_init);