Adding upstream version 6.6.15.upstream/6.6.15

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

5 files changed, 490 insertions, 0 deletions

diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
new file mode 100644
index 0000000000..c18def2691
--- /dev/null
+++ b/arch/arm/mach-ux500/Kconfig
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0
+menuconfig ARCH_U8500
+	bool "ST-Ericsson U8500 Series"
+	depends on ARCH_MULTI_V7
+	select AB8500_CORE
+	select ABX500_CORE
+	select ARM_AMBA
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_GIC
+	select CACHE_L2X0
+	select CLKSRC_DBX500_PRCMU
+	select CLKSRC_NOMADIK_MTU
+	select GPIOLIB
+	select HAVE_ARM_SCU if SMP
+	select HAVE_ARM_TWD if SMP
+	select I2C
+	select I2C_NOMADIK
+	select MFD_DB8500_PRCMU
+	select PINCTRL
+	select PINCTRL_AB8500
+	select PINCTRL_AB8505
+	select PINCTRL_ABX500
+	select PINCTRL_DB8500
+	select PINCTRL_NOMADIK
+	select PL310_ERRATA_753970 if CACHE_L2X0
+	select PM_GENERIC_DOMAINS if PM
+	select REGULATOR
+	select REGULATOR_DB8500_PRCMU
+	select REGULATOR_FIXED_VOLTAGE
+	select SOC_BUS
+	select RESET_CONTROLLER
+	help
+	  Support for ST-Ericsson's Ux500 architecture
+
+if ARCH_U8500
+
+config UX500_SOC_DB8500
+	def_bool y
+
+config UX500_DEBUG_UART
+	int "Ux500 UART to use for low-level debug"
+	default 2
+	help
+	  Choose the UART on which kernel low-level debug messages should be
+	  output.
+
+endif
diff --git a/arch/arm/mach-ux500/Makefile b/arch/arm/mach-ux500/Makefile
new file mode 100644
index 0000000000..270e5676fa
--- /dev/null
+++ b/arch/arm/mach-ux500/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the linux kernel, U8500 machine.
+#
+
+obj-y				:= pm.o
+obj-$(CONFIG_UX500_SOC_DB8500)	+= cpu-db8500.o
+obj-$(CONFIG_SMP)		+= platsmp.o
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
new file mode 100644
index 0000000000..b1a70f2033
--- /dev/null
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2008-2009 ST-Ericsson SA
+ *
+ * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
+ */
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/mfd/dbx500-prcmu.h>
+#include <linux/platform_data/arm-ux500-pm.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/regulator/machine.h>
+
+#include <asm/outercache.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/mach/map.h>
+#include <asm/mach/arch.h>
+
+static int __init ux500_l2x0_unlock(void)
+{
+	int i;
+	struct device_node *np;
+	void __iomem *l2x0_base;
+
+	np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
+	l2x0_base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!l2x0_base)
+		return -ENODEV;
+
+	/*
+	 * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
+	 * apparently locks both caches before jumping to the kernel. The
+	 * l2x0 core will not touch the unlock registers if the l2x0 is
+	 * already enabled, so we do it right here instead. The PL310 has
+	 * 8 sets of registers, one per possible CPU.
+	 */
+	for (i = 0; i < 8; i++) {
+		writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
+			       i * L2X0_LOCKDOWN_STRIDE);
+		writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
+			       i * L2X0_LOCKDOWN_STRIDE);
+	}
+	iounmap(l2x0_base);
+	return 0;
+}
+
+static void ux500_l2c310_write_sec(unsigned long val, unsigned reg)
+{
+	/*
+	 * We can't write to secure registers as we are in non-secure
+	 * mode, until we have some SMI service available.
+	 */
+}
+
+/*
+ * FIXME: Should we set up the GPIO domain here?
+ *
+ * The problem is that we cannot put the interrupt resources into the platform
+ * device until the irqdomain has been added. Right now, we set the GIC interrupt
+ * domain from init_irq(), then load the gpio driver from
+ * core_initcall(nmk_gpio_init) and add the platform devices from
+ * arch_initcall(customize_machine).
+ *
+ * This feels fragile because it depends on the gpio device getting probed
+ * _before_ any device uses the gpio interrupts.
+*/
+static void __init ux500_init_irq(void)
+{
+	struct device_node *np;
+	struct resource r;
+
+	irqchip_init();
+	prcmu_early_init();
+	np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
+	of_address_to_resource(np, 0, &r);
+	of_node_put(np);
+	if (!r.start) {
+		pr_err("could not find PRCMU base resource\n");
+		return;
+	}
+	ux500_pm_init(r.start, r.end-r.start);
+
+	/* Unlock before init */
+	ux500_l2x0_unlock();
+	outer_cache.write_sec = ux500_l2c310_write_sec;
+}
+
+static void ux500_restart(enum reboot_mode mode, const char *cmd)
+{
+	local_irq_disable();
+	local_fiq_disable();
+
+	prcmu_system_reset(0);
+}
+
+static const struct of_device_id u8500_local_bus_nodes[] = {
+	/* only create devices below soc node */
+	{ .compatible = "stericsson,db8500", },
+	{ .compatible = "simple-bus"},
+	{ },
+};
+
+static void __init u8500_init_machine(void)
+{
+	of_platform_populate(NULL, u8500_local_bus_nodes,
+			     NULL, NULL);
+}
+
+static const char * stericsson_dt_platform_compat[] = {
+	"st-ericsson,u8500",
+	"st-ericsson,u9500",
+	NULL,
+};
+
+DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
+	.l2c_aux_val    = 0,
+	.l2c_aux_mask	= ~0,
+	.init_irq	= ux500_init_irq,
+	.init_machine	= u8500_init_machine,
+	.dt_compat      = stericsson_dt_platform_compat,
+	.restart        = ux500_restart,
+MACHINE_END
diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
new file mode 100644
index 0000000000..656b58bd29
--- /dev/null
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2002 ARM Ltd.
+ * Copyright (C) 2008 STMicroelctronics.
+ * Copyright (C) 2009 ST-Ericsson.
+ * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
+ *
+ * This file is based on arm realview platform
+ */
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+/* Magic triggers in backup RAM */
+#define UX500_CPU1_JUMPADDR_OFFSET 0x1FF4
+#define UX500_CPU1_WAKEMAGIC_OFFSET 0x1FF0
+
+static void __iomem *backupram;
+
+static void __init ux500_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *np;
+	static void __iomem *scu_base;
+	unsigned int ncores;
+	int i;
+
+	np = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
+	if (!np) {
+		pr_err("No backupram base address\n");
+		return;
+	}
+	backupram = of_iomap(np, 0);
+	of_node_put(np);
+	if (!backupram) {
+		pr_err("No backupram remap\n");
+		return;
+	}
+
+	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+	if (!np) {
+		pr_err("No SCU base address\n");
+		return;
+	}
+	scu_base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!scu_base) {
+		pr_err("No SCU remap\n");
+		return;
+	}
+
+	scu_enable(scu_base);
+	ncores = scu_get_core_count(scu_base);
+	for (i = 0; i < ncores; i++)
+		set_cpu_possible(i, true);
+	iounmap(scu_base);
+}
+
+static int ux500_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	/*
+	 * write the address of secondary startup into the backup ram register
+	 * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the
+	 * backup ram register at offset 0x1FF0, which is what boot rom code
+	 * is waiting for. This will wake up the secondary core from WFE.
+	 */
+	writel(__pa_symbol(secondary_startup),
+	       backupram + UX500_CPU1_JUMPADDR_OFFSET);
+	writel(0xA1FEED01,
+	       backupram + UX500_CPU1_WAKEMAGIC_OFFSET);
+
+	/* make sure write buffer is drained */
+	mb();
+	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+	return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void ux500_cpu_die(unsigned int cpu)
+{
+	wfi();
+}
+#endif
+
+static const struct smp_operations ux500_smp_ops __initconst = {
+	.smp_prepare_cpus	= ux500_smp_prepare_cpus,
+	.smp_boot_secondary	= ux500_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= ux500_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(ux500_smp, "ste,dbx500-smp", &ux500_smp_ops);
diff --git a/arch/arm/mach-ux500/pm.c b/arch/arm/mach-ux500/pm.c
new file mode 100644
index 0000000000..dc962d006b
--- /dev/null
+++ b/arch/arm/mach-ux500/pm.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2010-2013
+ * Author: Rickard Andersson <rickard.andersson@stericsson.com> for
+ *         ST-Ericsson.
+ * Author: Daniel Lezcano <daniel.lezcano@linaro.org> for Linaro.
+ * Author: Ulf Hansson <ulf.hansson@linaro.org> for Linaro.
+ */
+
+#include <linux/kernel.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/suspend.h>
+#include <linux/platform_data/arm-ux500-pm.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+/* ARM WFI Standby signal register */
+#define PRCM_ARM_WFI_STANDBY    (prcmu_base + 0x130)
+#define PRCM_ARM_WFI_STANDBY_WFI0		0x08
+#define PRCM_ARM_WFI_STANDBY_WFI1		0x10
+#define PRCM_IOCR		(prcmu_base + 0x310)
+#define PRCM_IOCR_IOFORCE			0x1
+
+/* Dual A9 core interrupt management unit registers */
+#define PRCM_A9_MASK_REQ	(prcmu_base + 0x328)
+#define PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ	0x1
+
+#define PRCM_A9_MASK_ACK	(prcmu_base + 0x32c)
+#define PRCM_ARMITMSK31TO0	(prcmu_base + 0x11c)
+#define PRCM_ARMITMSK63TO32	(prcmu_base + 0x120)
+#define PRCM_ARMITMSK95TO64	(prcmu_base + 0x124)
+#define PRCM_ARMITMSK127TO96	(prcmu_base + 0x128)
+#define PRCM_POWER_STATE_VAL	(prcmu_base + 0x25C)
+#define PRCM_ARMITVAL31TO0	(prcmu_base + 0x260)
+#define PRCM_ARMITVAL63TO32	(prcmu_base + 0x264)
+#define PRCM_ARMITVAL95TO64	(prcmu_base + 0x268)
+#define PRCM_ARMITVAL127TO96	(prcmu_base + 0x26C)
+
+static void __iomem *prcmu_base;
+static void __iomem *dist_base;
+
+/* This function decouple the gic from the prcmu */
+int prcmu_gic_decouple(void)
+{
+	u32 val = readl(PRCM_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 1 */
+	writel(val | PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ,
+	       PRCM_A9_MASK_REQ);
+
+	/* Make sure the register is updated */
+	readl(PRCM_A9_MASK_REQ);
+
+	/* Wait a few cycles for the gic mask completion */
+	udelay(1);
+
+	return 0;
+}
+
+/* This function recouple the gic with the prcmu */
+int prcmu_gic_recouple(void)
+{
+	u32 val = readl(PRCM_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 0 */
+	writel(val & ~PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, PRCM_A9_MASK_REQ);
+
+	return 0;
+}
+
+#define PRCMU_GIC_NUMBER_REGS 5
+
+/*
+ * This function checks if there are pending irq on the gic. It only
+ * makes sense if the gic has been decoupled before with the
+ * db8500_prcmu_gic_decouple function. Disabling an interrupt only
+ * disables the forwarding of the interrupt to any CPU interface. It
+ * does not prevent the interrupt from changing state, for example
+ * becoming pending, or active and pending if it is already
+ * active. Hence, we have to check the interrupt is pending *and* is
+ * active.
+ */
+bool prcmu_gic_pending_irq(void)
+{
+	u32 pr; /* Pending register */
+	u32 er; /* Enable register */
+	int i;
+
+	/* 5 registers. STI & PPI not skipped */
+	for (i = 0; i < PRCMU_GIC_NUMBER_REGS; i++) {
+
+		pr = readl_relaxed(dist_base + GIC_DIST_PENDING_SET + i * 4);
+		er = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+		if (pr & er)
+			return true; /* There is a pending interrupt */
+	}
+
+	return false;
+}
+
+/*
+ * This function checks if there are pending interrupt on the
+ * prcmu which has been delegated to monitor the irqs with the
+ * db8500_prcmu_copy_gic_settings function.
+ */
+bool prcmu_pending_irq(void)
+{
+	u32 it, im;
+	int i;
+
+	for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) {
+		it = readl(PRCM_ARMITVAL31TO0 + i * 4);
+		im = readl(PRCM_ARMITMSK31TO0 + i * 4);
+		if (it & im)
+			return true; /* There is a pending interrupt */
+	}
+
+	return false;
+}
+
+/*
+ * This function checks if the specified cpu is in WFI. It's usage
+ * makes sense only if the gic is decoupled with the db8500_prcmu_gic_decouple
+ * function. Of course passing smp_processor_id() to this function will
+ * always return false...
+ */
+bool prcmu_is_cpu_in_wfi(int cpu)
+{
+	return readl(PRCM_ARM_WFI_STANDBY) &
+		(cpu ? PRCM_ARM_WFI_STANDBY_WFI1 : PRCM_ARM_WFI_STANDBY_WFI0);
+}
+
+/*
+ * This function copies the gic SPI settings to the prcmu in order to
+ * monitor them and abort/finish the retention/off sequence or state.
+ */
+int prcmu_copy_gic_settings(void)
+{
+	u32 er; /* Enable register */
+	int i;
+
+	/* We skip the STI and PPI */
+	for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) {
+		er = readl_relaxed(dist_base +
+				   GIC_DIST_ENABLE_SET + (i + 1) * 4);
+		writel(er, PRCM_ARMITMSK31TO0 + i * 4);
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_SUSPEND
+static int ux500_suspend_enter(suspend_state_t state)
+{
+	cpu_do_idle();
+	return 0;
+}
+
+static int ux500_suspend_valid(suspend_state_t state)
+{
+	return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
+}
+
+static const struct platform_suspend_ops ux500_suspend_ops = {
+	.enter	      = ux500_suspend_enter,
+	.valid	      = ux500_suspend_valid,
+};
+#define UX500_SUSPEND_OPS	(&ux500_suspend_ops)
+#else
+#define UX500_SUSPEND_OPS	NULL
+#endif
+
+void __init ux500_pm_init(u32 phy_base, u32 size)
+{
+	struct device_node *np;
+
+	prcmu_base = ioremap(phy_base, size);
+	if (!prcmu_base) {
+		pr_err("could not remap PRCMU for PM functions\n");
+		return;
+	}
+	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
+	dist_base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!dist_base) {
+		pr_err("could not remap GIC dist base for PM functions\n");
+		return;
+	}
+
+	/*
+	 * On watchdog reboot the GIC is in some cases decoupled.
+	 * This will make sure that the GIC is correctly configured.
+	 */
+	prcmu_gic_recouple();
+
+	/* Set up ux500 suspend callbacks. */
+	suspend_set_ops(UX500_SUSPEND_OPS);
+}