ARM: EXYNOS: Add Suspend-to-RAM support for exynos5420

Adds Suspend-to-RAM support for EXYNOS5420

Signed-off-by: Vikas Sajjan <vikas.sajjan@samsung.com>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 149 insertions, 2 deletions

diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c
index 079d999b8b23..8cef6141c408 100644
--- a/arch/arm/mach-exynos/suspend.c
+++ b/arch/arm/mach-exynos/suspend.c
@@ -39,6 +39,8 @@
 
 #define REG_TABLE_END (-1U)
 
+#define EXYNOS5420_CPU_STATE    0x28
+
 /**
  * struct exynos_wkup_irq - Exynos GIC to PMU IRQ mapping
  * @hwirq: Hardware IRQ signal of the GIC
@@ -77,6 +79,9 @@ struct exynos_pm_data {
 
 struct exynos_pm_data *pm_data;
 
+static int exynos5420_cpu_state;
+static unsigned int exynos_pmu_spare3;
+
 /*
  * GIC wake-up support
  */
@@ -106,6 +111,23 @@ unsigned int exynos_release_ret_regs[] = {
         REG_TABLE_END,
 };
 
+unsigned int exynos5420_release_ret_regs[] = {
+        EXYNOS_PAD_RET_DRAM_OPTION,
+        EXYNOS_PAD_RET_MAUDIO_OPTION,
+        EXYNOS_PAD_RET_JTAG_OPTION,
+        EXYNOS5420_PAD_RET_GPIO_OPTION,
+        EXYNOS5420_PAD_RET_UART_OPTION,
+        EXYNOS5420_PAD_RET_MMCA_OPTION,
+        EXYNOS5420_PAD_RET_MMCB_OPTION,
+        EXYNOS5420_PAD_RET_MMCC_OPTION,
+        EXYNOS5420_PAD_RET_HSI_OPTION,
+        EXYNOS_PAD_RET_EBIA_OPTION,
+        EXYNOS_PAD_RET_EBIB_OPTION,
+        EXYNOS5420_PAD_RET_SPI_OPTION,
+        EXYNOS5420_PAD_RET_DRAM_COREBLK_OPTION,
+        REG_TABLE_END,
+};
+
 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
 {
         const struct exynos_wkup_irq *wkup_irq;
@@ -136,11 +158,22 @@ static int exynos_cpu_do_idle(void)
         pr_info("Failed to suspend the system\n");
         return 1; /* Aborting suspend */
 }
-
-static int exynos_cpu_suspend(unsigned long arg)
+static void exynos_flush_cache_all(void)
 {
         flush_cache_all();
         outer_flush_all();
+}
+
+static int exynos_cpu_suspend(unsigned long arg)
+{
+        exynos_flush_cache_all();
+        return exynos_cpu_do_idle();
+}
+
+static int exynos5420_cpu_suspend(unsigned long arg)
+{
+        exynos_flush_cache_all();
+        __raw_writel(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
         return exynos_cpu_do_idle();
 }
 
@@ -175,6 +208,50 @@ static void exynos_pm_prepare(void)
         exynos_pm_enter_sleep_mode();
 }
 
+static void exynos5420_pm_prepare(void)
+{
+        unsigned int tmp;
+
+        /* Set wake-up mask registers */
+        exynos_pm_set_wakeup_mask();
+
+        s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
+
+        exynos_pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
+        /*
+         * The cpu state needs to be saved and restored so that the
+         * secondary CPUs will enter low power start. Though the U-Boot
+         * is setting the cpu state with low power flag, the kernel
+         * needs to restore it back in case, the primary cpu fails to
+         * suspend for any reason.
+         */
+        exynos5420_cpu_state = __raw_readl(sysram_base_addr +
+                                                EXYNOS5420_CPU_STATE);
+
+        exynos_pm_enter_sleep_mode();
+
+        tmp = pmu_raw_readl(EXYNOS5_ARM_L2_OPTION);
+        tmp &= ~EXYNOS5_USE_RETENTION;
+        pmu_raw_writel(tmp, EXYNOS5_ARM_L2_OPTION);
+
+        tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
+        tmp |= EXYNOS5420_UFS;
+        pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
+
+        tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
+        tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
+        pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
+
+        tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
+        tmp |= EXYNOS5420_EMULATION;
+        pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
+
+        tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
+        tmp |= EXYNOS5420_EMULATION;
+        pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
+}
+
+
 static int exynos_pm_suspend(void)
 {
         exynos_pm_central_suspend();
@@ -185,6 +262,24 @@ static int exynos_pm_suspend(void)
         return 0;
 }
 
+static int exynos5420_pm_suspend(void)
+{
+        u32 this_cluster;
+
+        exynos_pm_central_suspend();
+
+        /* Setting SEQ_OPTION register */
+
+        this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
+        if (!this_cluster)
+                pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
+                                S5P_CENTRAL_SEQ_OPTION);
+        else
+                pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
+                                S5P_CENTRAL_SEQ_OPTION);
+        return 0;
+}
+
 static void exynos_pm_release_retention(void)
 {
         unsigned int i;
@@ -223,6 +318,45 @@ early_wakeup:
         pmu_raw_writel(0x0, S5P_INFORM1);
 }
 
+static void exynos5420_pm_resume(void)
+{
+        unsigned long tmp;
+
+        /* Restore the sysram cpu state register */
+        __raw_writel(exynos5420_cpu_state,
+                sysram_base_addr + EXYNOS5420_CPU_STATE);
+
+        pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
+                        S5P_CENTRAL_SEQ_OPTION);
+
+        if (exynos_pm_central_resume())
+                goto early_wakeup;
+
+        /* For release retention */
+        exynos_pm_release_retention();
+
+        pmu_raw_writel(exynos_pmu_spare3, S5P_PMU_SPARE3);
+
+        s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
+
+early_wakeup:
+
+        tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
+        tmp &= ~EXYNOS5420_UFS;
+        pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
+
+        tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
+        tmp &= ~EXYNOS5420_EMULATION;
+        pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
+
+        tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
+        tmp &= ~EXYNOS5420_EMULATION;
+        pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
+
+        /* Clear SLEEP mode set in INFORM1 */
+        pmu_raw_writel(0x0, S5P_INFORM1);
+}
+
 /*
  * Suspend Ops
  */
@@ -310,6 +444,16 @@ static const struct exynos_pm_data exynos5250_pm_data = {
         .cpu_suspend    = exynos_cpu_suspend,
 };
 
+static struct exynos_pm_data exynos5420_pm_data = {
+        .wkup_irq       = exynos5250_wkup_irq,
+        .wake_disable_mask = (0x7F << 7) | (0x1F << 1),
+        .release_ret_regs = exynos5420_release_ret_regs,
+        .pm_resume      = exynos5420_pm_resume,
+        .pm_suspend     = exynos5420_pm_suspend,
+        .pm_prepare     = exynos5420_pm_prepare,
+        .cpu_suspend    = exynos5420_cpu_suspend,
+};
+
 static struct of_device_id exynos_pmu_of_device_ids[] = {
         {
                 .compatible = "samsung,exynos4210-pmu",
@@ -323,6 +467,9 @@ static struct of_device_id exynos_pmu_of_device_ids[] = {
         }, {
                 .compatible = "samsung,exynos5250-pmu",
                 .data = &exynos5250_pm_data,
+        }, {
+                .compatible = "samsung,exynos5420-pmu",
+                .data = &exynos5420_pm_data,
         },
         { /*sentinel*/ },
 };