[PATCH v7] ARM: EXYNOS: Use MCPM call-backs to support S2R on Exynos5420

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Use the MCPM layer to handle core suspend/resume on Exynos5420.
Also, restore the entry address setup code post-resume.

Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx>
---
Changes in v2:
	- Made use of the MCPM suspend/powered_up call-backs
Changes in v3:
	- Used the residency value to indicate the entered state
Changes in v4:
	- Checked if MCPM has been enabled to prevent build error
Changes in v5:
	- Removed the MCPM flags and just used a local flag to
	indicate that we are suspending.
Changes in v6:
	- Read the SYS_PWR_REG value to decide if we are suspending
	the system.
	- Restore the SYS_PWR_REG value post-resume.
	- Modified the comments to reflect the first change.
Changes in v7:
	- Add the suspend check in exynos_cpu_power_down() rather
	than the MCPM back-end.
	- Clean-up unnecessary changes related to earlier versions.

This has been tested both on an SMDK5420 and Peach Pit Chromebook on
next-20140704. Nicolas' boot cluster CCI enablement patches are in
linux-next now.

Here are the dependencies (some of these patches did not apply cleanly):
1) Cleanup patches for mach-exynos
http://comments.gmane.org/gmane.linux.kernel.samsung-soc/33772

2) PMU cleanup and refactoring for using DT
https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg671625.html

3) Exynos5420 PMU/S2R Series
http://comments.gmane.org/gmane.linux.kernel.samsung-soc/33898

4) Exynos5420 CPUIdle Series which populates MCPM suspend/powered_up
call-backs.
www.gossamer-threads.com/lists/linux/kernel/1945347
https://patchwork.kernel.org/patch/4357461/

5) Exynos5420 MCPM cluster power down support
http://www.spinics.net/lists/arm-kernel/msg339988.html

6) TPM reset mask patch
http://www.spinics.net/lists/arm-kernel/msg341884.html
 
 arch/arm/mach-exynos/mcpm-exynos.c | 32 +++++++++++++++-------
 arch/arm/mach-exynos/pm.c          | 54 ++++++++++++++++++++++++++++++++++++--
 2 files changed, 74 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c
index 2dd51cc..74ad772 100644
--- a/arch/arm/mach-exynos/mcpm-exynos.c
+++ b/arch/arm/mach-exynos/mcpm-exynos.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/of_address.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/cputype.h>
 #include <asm/cp15.h>
@@ -30,6 +31,8 @@
 #define EXYNOS5420_USE_ARM_CORE_DOWN_STATE	BIT(29)
 #define EXYNOS5420_USE_L2_COMMON_UP_STATE	BIT(30)
 
+static void __iomem *ns_sram_base_addr;
+
 /*
  * The common v7_exit_coherency_flush API could not be used because of the
  * Erratum 799270 workaround. This macro is the same as the common one (in
@@ -319,10 +322,26 @@ static const struct of_device_id exynos_dt_mcpm_match[] = {
 	{},
 };
 
+static void exynos_mcpm_setup_entry_point(void)
+{
+	/*
+	 * U-Boot SPL is hardcoded to jump to the start of ns_sram_base_addr
+	 * as part of secondary_cpu_start().  Let's redirect it to the
+	 * mcpm_entry_point(). This is done during both secondary boot-up as
+	 * well as system resume.
+	 */
+	__raw_writel(0xe59f0000, ns_sram_base_addr);     /* ldr r0, [pc, #0] */
+	__raw_writel(0xe12fff10, ns_sram_base_addr + 4); /* bx  r0 */
+	__raw_writel(virt_to_phys(mcpm_entry_point), ns_sram_base_addr + 8);
+}
+
+static struct syscore_ops exynos_mcpm_syscore_ops = {
+	.resume	= exynos_mcpm_setup_entry_point,
+};
+
 static int __init exynos_mcpm_init(void)
 {
 	struct device_node *node;
-	void __iomem *ns_sram_base_addr;
 	unsigned int value, i;
 	int ret;
 
@@ -389,16 +408,9 @@ static int __init exynos_mcpm_init(void)
 		__raw_writel(value, pmu_base_addr + EXYNOS_COMMON_OPTION(i));
 	}
 
-	/*
-	 * U-Boot SPL is hardcoded to jump to the start of ns_sram_base_addr
-	 * as part of secondary_cpu_start().  Let's redirect it to the
-	 * mcpm_entry_point().
-	 */
-	__raw_writel(0xe59f0000, ns_sram_base_addr);     /* ldr r0, [pc, #0] */
-	__raw_writel(0xe12fff10, ns_sram_base_addr + 4); /* bx  r0 */
-	__raw_writel(virt_to_phys(mcpm_entry_point), ns_sram_base_addr + 8);
+	exynos_mcpm_setup_entry_point();
 
-	iounmap(ns_sram_base_addr);
+	register_syscore_ops(&exynos_mcpm_syscore_ops);
 
 	return ret;
 }
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index 69cf678..e2ba1e5 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -24,6 +24,7 @@
 
 #include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>
+#include <asm/mcpm.h>
 #include <asm/smp_scu.h>
 #include <asm/suspend.h>
 
@@ -123,6 +124,17 @@ static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
  */
 void exynos_cpu_power_down(int cpu)
 {
+	if (soc_is_exynos5420() && cpu == 0) {
+		/*
+		 * Bypass power down for CPU0 during suspend. Check for
+		 * the SYS_PWR_REG value to decide if we are suspending
+		 * the system.
+		 */
+		int val = __raw_readl(pmu_base_addr +
+				EXYNOS5_ARM_CORE0_SYS_PWR_REG);
+		if (!(val & S5P_CORE_LOCAL_PWR_EN))
+			return;
+	}
 	pmu_raw_writel(0, EXYNOS_ARM_CORE_CONFIGURATION(cpu));
 }
 
@@ -318,7 +330,10 @@ static void exynos_pm_prepare(void)
 
 	/* ensure at least INFORM0 has the resume address */
 
-	pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
+	if (soc_is_exynos5420() && IS_ENABLED(CONFIG_MCPM))
+		pmu_raw_writel(virt_to_phys(mcpm_entry_point), S5P_INFORM0);
+	else
+		pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
 
 	if (soc_is_exynos5420()) {
 		tmp = __raw_readl(pmu_base_addr + EXYNOS5_ARM_L2_OPTION);
@@ -408,6 +423,12 @@ static void exynos_pm_resume(void)
 	unsigned int tmp;
 
 	if (soc_is_exynos5420()) {
+		/* Restore the CPU0 low power state register */
+		tmp = __raw_readl(pmu_base_addr +
+			EXYNOS5_ARM_CORE0_SYS_PWR_REG);
+		pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
+			EXYNOS5_ARM_CORE0_SYS_PWR_REG);
+
 		/* Restore the sysram cpu state register */
 		__raw_writel(exynos5420_cpu_state,
 		sysram_base_addr + EXYNOS5420_CPU_STATE);
@@ -490,6 +511,28 @@ static struct syscore_ops exynos_pm_syscore_ops = {
 	.resume		= exynos_pm_resume,
 };
 
+static int notrace exynos_mcpm_cpu_suspend(unsigned long arg)
+{
+	/* MCPM works with HW CPU identifiers */
+	unsigned int mpidr = read_cpuid_mpidr();
+	unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+
+	__raw_writel(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
+
+	mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
+
+	/*
+	 * Residency value passed to mcpm_cpu_suspend back-end
+	 * has to be given clear semantics. Set to 0 as a
+	 * temporary value.
+	 */
+	mcpm_cpu_suspend(0);
+
+	/* return value != 0 means failure */
+	return 1;
+}
+
 /*
  * Suspend Ops
  */
@@ -517,10 +560,17 @@ static int exynos_suspend_enter(suspend_state_t state)
 	flush_cache_all();
 	s3c_pm_check_store();
 
-	ret = cpu_suspend(0, exynos_cpu_suspend);
+	/* Use the MCPM layer to suspend 5420 which is a multi-cluster SoC */
+	if (soc_is_exynos5420() && IS_ENABLED(CONFIG_MCPM))
+		ret = cpu_suspend(0, exynos_mcpm_cpu_suspend);
+	else
+		ret = cpu_suspend(0, exynos_cpu_suspend);
 	if (ret)
 		return ret;
 
+	if (soc_is_exynos5420() && IS_ENABLED(CONFIG_MCPM))
+		mcpm_cpu_powered_up();
+
 	s3c_pm_restore_uarts();
 
 	S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
-- 
2.0.0

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