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. This has been tested both on an SMDK5420 and Peach Pit Chromebook on 3.16-rc3/next-20140702. 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) MCPM boot CPU CCI enablement patches www.spinics.net/lists/linux-samsung-soc/msg32923.html 5) 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/ 6) Exynos5420 MCPM cluster power down support http://www.spinics.net/lists/arm-kernel/msg339988.html 7) TPM reset mask patch http://www.spinics.net/lists/arm-kernel/msg341884.html arch/arm/mach-exynos/mcpm-exynos.c | 50 +++++++++++++++++++++++++++----------- arch/arm/mach-exynos/pm.c | 37 +++++++++++++++++++++++++--- arch/arm/mach-exynos/regs-pmu.h | 1 + 3 files changed, 71 insertions(+), 17 deletions(-) diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c index 2dd51cc..60f84c9 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 @@ -129,7 +132,7 @@ static int exynos_power_up(unsigned int cpu, unsigned int cluster) * and can only be executed on processors like A15 and A7 that hit the cache * with the C bit clear in the SCTLR register. */ -static void exynos_power_down(void) +static void exynos_mcpm_power_down(u64 residency) { unsigned int mpidr, cpu, cluster; bool last_man = false, skip_wfi = false; @@ -150,7 +153,12 @@ static void exynos_power_down(void) BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP); cpu_use_count[cpu][cluster]--; if (cpu_use_count[cpu][cluster] == 0) { - exynos_cpu_power_down(cpunr); + /* + * Bypass power down for CPU0 during suspend. This is being + * taken care by the SYS_PWR_CFG bit in CORE0_SYS_PWR_REG. + */ + if ((cpunr != 0) || (residency != S5P_CHECK_SLEEP)) + exynos_cpu_power_down(cpunr); if (exynos_cluster_unused(cluster)) { exynos_cluster_power_down(cluster); @@ -209,6 +217,11 @@ static void exynos_power_down(void) /* Not dead at this point? Let our caller cope. */ } +static void exynos_power_down(void) +{ + exynos_mcpm_power_down(0); +} + static int exynos_wait_for_powerdown(unsigned int cpu, unsigned int cluster) { unsigned int tries = 100; @@ -250,11 +263,11 @@ static void exynos_suspend(u64 residency) { unsigned int mpidr, cpunr; - exynos_power_down(); + exynos_mcpm_power_down(residency); /* * Execution reaches here only if cpu did not power down. - * Hence roll back the changes done in exynos_power_down function. + * Hence roll back the changes done in exynos_mcpm_power_down function. * * CAUTION: "This function requires the stack data to be visible through * power down and can only be executed on processors like A15 and A7 @@ -319,10 +332,26 @@ 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 +418,9 @@ 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..278f204 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> @@ -191,7 +192,6 @@ int exynos_cluster_power_state(int cluster) pmu_base_addr + S5P_INFORM1)) #define S5P_CHECK_AFTR 0xFCBA0D10 -#define S5P_CHECK_SLEEP 0x00000BAD /* Ext-GIC nIRQ/nFIQ is the only wakeup source in AFTR */ static void exynos_set_wakeupmask(long mask) @@ -318,7 +318,10 @@ 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); @@ -490,6 +493,27 @@ 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); + + /* + * Pass S5P_CHECK_SLEEP flag to the MCPM back-end to indicate that + * we are suspending the system and need to skip CPU0 power down. + */ + mcpm_cpu_suspend(S5P_CHECK_SLEEP); + + /* return value != 0 means failure */ + return 1; +} + /* * Suspend Ops */ @@ -517,10 +541,17 @@ 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__, diff --git a/arch/arm/mach-exynos/regs-pmu.h b/arch/arm/mach-exynos/regs-pmu.h index 3cf0454..e8c75db 100644 --- a/arch/arm/mach-exynos/regs-pmu.h +++ b/arch/arm/mach-exynos/regs-pmu.h @@ -152,6 +152,7 @@ #define S5P_PAD_RET_EBIB_OPTION 0x31A8 #define S5P_CORE_LOCAL_PWR_EN 0x3 +#define S5P_CHECK_SLEEP 0x00000BAD /* Only for EXYNOS4210 */ #define S5P_CMU_CLKSTOP_LCD1_LOWPWR 0x1154 -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
 |