Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC platform updates from Arnd Bergmann:
 "Most of the commits are for defconfig changes, to enable newly added
  drivers or features that people have started using. For the changed
  lines lines, we have mostly cleanups, the affected platforms are OMAP,
  Versatile, EP93xx, Samsung, Broadcom, i.MX, and Actions.

  The largest single change is the introduction of the TI "sysc" bus
  driver, with the intention of cleaning up more legacy code.

  Two new SoC platforms get added this time:

   - Allwinner R40 is a modernized version of the A20 chip, now with a
     Quad-Core ARM Cortex-A7. According to the manufacturer, it is
     intended for "Smart Hardware"

   - Broadcom Hurricane 2 (Aka Strataconnect BCM5334X) is a family of
     chips meant for managed gigabit ethernet switches, based around a
     Cortex-A9 CPU.

  Finally, we gain SMP support for two platforms: Renesas R-Car E2 and
  Amlogic Meson8/8b, which were previously added but only supported
  uniprocessor operation"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (118 commits)
  ARM: multi_v7_defconfig: Select RPMSG_VIRTIO as module
  ARM: multi_v7_defconfig: enable CONFIG_GPIO_UNIPHIER
  arm64: defconfig: enable CONFIG_GPIO_UNIPHIER
  ARM: meson: enable MESON_IRQ_GPIO in Kconfig for meson8b
  ARM: meson: Add SMP bringup code for Meson8 and Meson8b
  ARM: smp_scu: allow the platform code to read the SCU CPU status
  ARM: smp_scu: add a helper for powering on a specific CPU
  dt-bindings: Amlogic: Add Meson8 and Meson8b SMP related documentation
  ARM: OMAP3: Delete an unnecessary variable initialisation in omap3xxx_hwmod_init()
  ARM: OMAP3: Use common error handling code in omap3xxx_hwmod_init()
  ARM: defconfig: select the right SX150X driver
  arm64: defconfig: Enable QCOM_IOMMU
  arm64: Add ThunderX drivers to defconfig
  arm64: defconfig: Enable Tegra PCI controller
  cpufreq: imx6q: Move speed grading check to cpufreq driver
  arm64: defconfig: re-enable Qualcomm DB410c USB
  ARM: configs: stm32: Add MDMA support in STM32 defconfig
  ARM: imx: Enable cpuidle for i.MX6DL starting at 1.1
  bus: ti-sysc: Fix unbalanced pm_runtime_enable by adding remove
  bus: ti-sysc: mark PM functions as __maybe_unused
  ...

3 files changed, 443 insertions, 0 deletions

diff --git a/arch/arm/mach-meson/Kconfig b/arch/arm/mach-meson/Kconfig
index ee30511849ca..aff6164b2083 100644
--- a/arch/arm/mach-meson/Kconfig
+++ b/arch/arm/mach-meson/Kconfig
@@ -9,6 +9,7 @@ menuconfig ARCH_MESON
 	select PINCTRL_MESON
 	select COMMON_CLK
 	select COMMON_CLK_AMLOGIC
+	select HAVE_ARM_SCU if SMP
 
 if ARCH_MESON
 
@@ -28,5 +29,6 @@ config MACH_MESON8B
 	default ARCH_MESON
 	select MESON6_TIMER
 	select COMMON_CLK_MESON8B
+	select MESON_IRQ_GPIO
 
 endif
diff --git a/arch/arm/mach-meson/Makefile b/arch/arm/mach-meson/Makefile
index 9d7380eeeedd..bc26c85a7e8f 100644
--- a/arch/arm/mach-meson/Makefile
+++ b/arch/arm/mach-meson/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_ARCH_MESON) += meson.o
+obj-$(CONFIG_SMP) += platsmp.o
diff --git a/arch/arm/mach-meson/platsmp.c b/arch/arm/mach-meson/platsmp.c
new file mode 100644
index 000000000000..2555f9056a33
--- /dev/null
+++ b/arch/arm/mach-meson/platsmp.c
@@ -0,0 +1,440 @@
+/*
+ * Copyright (C) 2015 Carlo Caione <carlo@endlessm.com>
+ * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/smp.h>
+#include <linux/mfd/syscon.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cp15.h>
+#include <asm/smp_scu.h>
+#include <asm/smp_plat.h>
+
+#define MESON_SMP_SRAM_CPU_CTRL_REG		(0x00)
+#define MESON_SMP_SRAM_CPU_CTRL_ADDR_REG(c)	(0x04 + ((c - 1) << 2))
+
+#define MESON_CPU_AO_RTI_PWR_A9_CNTL0		(0x00)
+#define MESON_CPU_AO_RTI_PWR_A9_CNTL1		(0x04)
+#define MESON_CPU_AO_RTI_PWR_A9_MEM_PD0		(0x14)
+
+#define MESON_CPU_PWR_A9_CNTL0_M(c)		(0x03 << ((c * 2) + 16))
+#define MESON_CPU_PWR_A9_CNTL1_M(c)		(0x03 << ((c + 1) << 1))
+#define MESON_CPU_PWR_A9_MEM_PD0_M(c)		(0x0f << (32 - (c * 4)))
+#define MESON_CPU_PWR_A9_CNTL1_ST(c)		(0x01 << (c + 16))
+
+static void __iomem *sram_base;
+static void __iomem *scu_base;
+static struct regmap *pmu;
+
+static struct reset_control *meson_smp_get_core_reset(int cpu)
+{
+	struct device_node *np = of_get_cpu_node(cpu, 0);
+
+	return of_reset_control_get_exclusive(np, NULL);
+}
+
+static void meson_smp_set_cpu_ctrl(int cpu, bool on_off)
+{
+	u32 val = readl(sram_base + MESON_SMP_SRAM_CPU_CTRL_REG);
+
+	if (on_off)
+		val |= BIT(cpu);
+	else
+		val &= ~BIT(cpu);
+
+	/* keep bit 0 always enabled */
+	val |= BIT(0);
+
+	writel(val, sram_base + MESON_SMP_SRAM_CPU_CTRL_REG);
+}
+
+static void __init meson_smp_prepare_cpus(const char *scu_compatible,
+					  const char *pmu_compatible,
+					  const char *sram_compatible)
+{
+	static struct device_node *node;
+
+	/* SMP SRAM */
+	node = of_find_compatible_node(NULL, NULL, sram_compatible);
+	if (!node) {
+		pr_err("Missing SRAM node\n");
+		return;
+	}
+
+	sram_base = of_iomap(node, 0);
+	if (!sram_base) {
+		pr_err("Couldn't map SRAM registers\n");
+		return;
+	}
+
+	/* PMU */
+	pmu = syscon_regmap_lookup_by_compatible(pmu_compatible);
+	if (IS_ERR(pmu)) {
+		pr_err("Couldn't map PMU registers\n");
+		return;
+	}
+
+	/* SCU */
+	node = of_find_compatible_node(NULL, NULL, scu_compatible);
+	if (!node) {
+		pr_err("Missing SCU node\n");
+		return;
+	}
+
+	scu_base = of_iomap(node, 0);
+	if (!scu_base) {
+		pr_err("Couln't map SCU registers\n");
+		return;
+	}
+
+	scu_enable(scu_base);
+}
+
+static void __init meson8b_smp_prepare_cpus(unsigned int max_cpus)
+{
+	meson_smp_prepare_cpus("arm,cortex-a5-scu", "amlogic,meson8b-pmu",
+			       "amlogic,meson8b-smp-sram");
+}
+
+static void __init meson8_smp_prepare_cpus(unsigned int max_cpus)
+{
+	meson_smp_prepare_cpus("arm,cortex-a9-scu", "amlogic,meson8-pmu",
+			       "amlogic,meson8-smp-sram");
+}
+
+static void meson_smp_begin_secondary_boot(unsigned int cpu)
+{
+	/*
+	 * Set the entry point before powering on the CPU through the SCU. This
+	 * is needed if the CPU is in "warm" state (= after rebooting the
+	 * system without power-cycling, or when taking the CPU offline and
+	 * then taking it online again.
+	 */
+	writel(__pa_symbol(secondary_startup),
+	       sram_base + MESON_SMP_SRAM_CPU_CTRL_ADDR_REG(cpu));
+
+	/*
+	 * SCU Power on CPU (needs to be done before starting the CPU,
+	 * otherwise the secondary CPU will not start).
+	 */
+	scu_cpu_power_enable(scu_base, cpu);
+}
+
+static int meson_smp_finalize_secondary_boot(unsigned int cpu)
+{
+	unsigned long timeout;
+
+	timeout = jiffies + (10 * HZ);
+	while (readl(sram_base + MESON_SMP_SRAM_CPU_CTRL_ADDR_REG(cpu))) {
+		if (!time_before(jiffies, timeout)) {
+			pr_err("Timeout while waiting for CPU%d status\n",
+			       cpu);
+			return -ETIMEDOUT;
+		}
+	}
+
+	writel(__pa_symbol(secondary_startup),
+	       sram_base + MESON_SMP_SRAM_CPU_CTRL_ADDR_REG(cpu));
+
+	meson_smp_set_cpu_ctrl(cpu, true);
+
+	return 0;
+}
+
+static int meson8_smp_boot_secondary(unsigned int cpu,
+				     struct task_struct *idle)
+{
+	struct reset_control *rstc;
+	int ret;
+
+	rstc = meson_smp_get_core_reset(cpu);
+	if (IS_ERR(rstc)) {
+		pr_err("Couldn't get the reset controller for CPU%d\n", cpu);
+		return PTR_ERR(rstc);
+	}
+
+	meson_smp_begin_secondary_boot(cpu);
+
+	/* Reset enable */
+	ret = reset_control_assert(rstc);
+	if (ret) {
+		pr_err("Failed to assert CPU%d reset\n", cpu);
+		goto out;
+	}
+
+	/* CPU power ON */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL1,
+				 MESON_CPU_PWR_A9_CNTL1_M(cpu), 0);
+	if (ret < 0) {
+		pr_err("Couldn't wake up CPU%d\n", cpu);
+		goto out;
+	}
+
+	udelay(10);
+
+	/* Isolation disable */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL0, BIT(cpu),
+				 0);
+	if (ret < 0) {
+		pr_err("Error when disabling isolation of CPU%d\n", cpu);
+		goto out;
+	}
+
+	/* Reset disable */
+	ret = reset_control_deassert(rstc);
+	if (ret) {
+		pr_err("Failed to de-assert CPU%d reset\n", cpu);
+		goto out;
+	}
+
+	ret = meson_smp_finalize_secondary_boot(cpu);
+	if (ret)
+		goto out;
+
+out:
+	reset_control_put(rstc);
+
+	return 0;
+}
+
+static int meson8b_smp_boot_secondary(unsigned int cpu,
+				     struct task_struct *idle)
+{
+	struct reset_control *rstc;
+	int ret;
+	u32 val;
+
+	rstc = meson_smp_get_core_reset(cpu);
+	if (IS_ERR(rstc)) {
+		pr_err("Couldn't get the reset controller for CPU%d\n", cpu);
+		return PTR_ERR(rstc);
+	}
+
+	meson_smp_begin_secondary_boot(cpu);
+
+	/* CPU power UP */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL0,
+				 MESON_CPU_PWR_A9_CNTL0_M(cpu), 0);
+	if (ret < 0) {
+		pr_err("Couldn't power up CPU%d\n", cpu);
+		goto out;
+	}
+
+	udelay(5);
+
+	/* Reset enable */
+	ret = reset_control_assert(rstc);
+	if (ret) {
+		pr_err("Failed to assert CPU%d reset\n", cpu);
+		goto out;
+	}
+
+	/* Memory power UP */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_MEM_PD0,
+				 MESON_CPU_PWR_A9_MEM_PD0_M(cpu), 0);
+	if (ret < 0) {
+		pr_err("Couldn't power up the memory for CPU%d\n", cpu);
+		goto out;
+	}
+
+	/* Wake up CPU */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL1,
+				 MESON_CPU_PWR_A9_CNTL1_M(cpu), 0);
+	if (ret < 0) {
+		pr_err("Couldn't wake up CPU%d\n", cpu);
+		goto out;
+	}
+
+	udelay(10);
+
+	ret = regmap_read_poll_timeout(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL1, val,
+				       val & MESON_CPU_PWR_A9_CNTL1_ST(cpu),
+				       10, 10000);
+	if (ret) {
+		pr_err("Timeout while polling PMU for CPU%d status\n", cpu);
+		goto out;
+	}
+
+	/* Isolation disable */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL0, BIT(cpu),
+				 0);
+	if (ret < 0) {
+		pr_err("Error when disabling isolation of CPU%d\n", cpu);
+		goto out;
+	}
+
+	/* Reset disable */
+	ret = reset_control_deassert(rstc);
+	if (ret) {
+		pr_err("Failed to de-assert CPU%d reset\n", cpu);
+		goto out;
+	}
+
+	ret = meson_smp_finalize_secondary_boot(cpu);
+	if (ret)
+		goto out;
+
+out:
+	reset_control_put(rstc);
+
+	return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void meson8_smp_cpu_die(unsigned int cpu)
+{
+	meson_smp_set_cpu_ctrl(cpu, false);
+
+	v7_exit_coherency_flush(louis);
+
+	scu_power_mode(scu_base, SCU_PM_POWEROFF);
+
+	dsb();
+	wfi();
+
+	/* we should never get here */
+	WARN_ON(1);
+}
+
+static int meson8_smp_cpu_kill(unsigned int cpu)
+{
+	int ret, power_mode;
+	unsigned long timeout;
+
+	timeout = jiffies + (50 * HZ);
+	do {
+		power_mode = scu_get_cpu_power_mode(scu_base, cpu);
+
+		if (power_mode == SCU_PM_POWEROFF)
+			break;
+
+		usleep_range(10000, 15000);
+	} while (time_before(jiffies, timeout));
+
+	if (power_mode != SCU_PM_POWEROFF) {
+		pr_err("Error while waiting for SCU power-off on CPU%d\n",
+		       cpu);
+		return -ETIMEDOUT;
+	}
+
+	msleep(30);
+
+	/* Isolation enable */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL0, BIT(cpu),
+				 0x3);
+	if (ret < 0) {
+		pr_err("Error when enabling isolation for CPU%d\n", cpu);
+		return ret;
+	}
+
+	udelay(10);
+
+	/* CPU power OFF */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL1,
+				 MESON_CPU_PWR_A9_CNTL1_M(cpu), 0x3);
+	if (ret < 0) {
+		pr_err("Couldn't change sleep status of CPU%d\n", cpu);
+		return ret;
+	}
+
+	return 1;
+}
+
+static int meson8b_smp_cpu_kill(unsigned int cpu)
+{
+	int ret, power_mode, count = 5000;
+
+	do {
+		power_mode = scu_get_cpu_power_mode(scu_base, cpu);
+
+		if (power_mode == SCU_PM_POWEROFF)
+			break;
+
+		udelay(10);
+	} while (++count);
+
+	if (power_mode != SCU_PM_POWEROFF) {
+		pr_err("Error while waiting for SCU power-off on CPU%d\n",
+		       cpu);
+		return -ETIMEDOUT;
+	}
+
+	udelay(10);
+
+	/* CPU power DOWN */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL0,
+				 MESON_CPU_PWR_A9_CNTL0_M(cpu), 0x3);
+	if (ret < 0) {
+		pr_err("Couldn't power down CPU%d\n", cpu);
+		return ret;
+	}
+
+	/* Isolation enable */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL0, BIT(cpu),
+				 0x3);
+	if (ret < 0) {
+		pr_err("Error when enabling isolation for CPU%d\n", cpu);
+		return ret;
+	}
+
+	udelay(10);
+
+	/* Sleep status */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_CNTL1,
+				 MESON_CPU_PWR_A9_CNTL1_M(cpu), 0x3);
+	if (ret < 0) {
+		pr_err("Couldn't change sleep status of CPU%d\n", cpu);
+		return ret;
+	}
+
+	/* Memory power DOWN */
+	ret = regmap_update_bits(pmu, MESON_CPU_AO_RTI_PWR_A9_MEM_PD0,
+				 MESON_CPU_PWR_A9_MEM_PD0_M(cpu), 0xf);
+	if (ret < 0) {
+		pr_err("Couldn't power down the memory of CPU%d\n", cpu);
+		return ret;
+	}
+
+	return 1;
+}
+#endif
+
+static struct smp_operations meson8_smp_ops __initdata = {
+	.smp_prepare_cpus	= meson8_smp_prepare_cpus,
+	.smp_boot_secondary	= meson8_smp_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= meson8_smp_cpu_die,
+	.cpu_kill		= meson8_smp_cpu_kill,
+#endif
+};
+
+static struct smp_operations meson8b_smp_ops __initdata = {
+	.smp_prepare_cpus	= meson8b_smp_prepare_cpus,
+	.smp_boot_secondary	= meson8b_smp_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= meson8_smp_cpu_die,
+	.cpu_kill		= meson8b_smp_cpu_kill,
+#endif
+};
+
+CPU_METHOD_OF_DECLARE(meson8_smp, "amlogic,meson8-smp", &meson8_smp_ops);
+CPU_METHOD_OF_DECLARE(meson8b_smp, "amlogic,meson8b-smp", &meson8b_smp_ops);