[PATCH v6 3/4] arm: exynos5: Add Suspend-to-RAM support for 5420
Vikas Sajjan
vikas.sajjan at samsung.com
Mon Jul 7 06:03:35 PDT 2014
From: Abhilash Kesavan <a.kesavan at samsung.com>
Adds Suspend-to-RAM support for EXYNOS5420
Signed-off-by: Vikas Sajjan <vikas.sajjan at samsung.com>
Signed-off-by: Abhilash Kesavan <a.kesavan at samsung.com>
---
arch/arm/mach-exynos/pm.c | 146 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 146 insertions(+)
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index c0dae28..7edc3d0 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -40,6 +40,8 @@
#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
@@ -76,6 +78,9 @@ 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
*/
@@ -115,6 +120,23 @@ 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;
@@ -312,6 +334,17 @@ static int exynos5250_cpu_suspend(unsigned long arg)
return exynos_cpu_do_idle();
}
+static int exynos5420_cpu_suspend(unsigned long arg)
+{
+#ifdef CONFIG_CACHE_L2X0
+ outer_flush_all();
+#endif
+ __raw_writel(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
+
+ flush_cache_all();
+ return exynos_cpu_do_idle();
+}
+
static void exynos_pm_set_wakeup_mask(void)
{
/* Set wake-up mask registers */
@@ -329,6 +362,49 @@ static void exynos_pm_enter_sleep_mode(void)
pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
}
+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 void exynos5250_pm_prepare(void)
{
unsigned int tmp;
@@ -403,6 +479,24 @@ static int exynos5250_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 int exynos_pm_central_resume(void)
{
unsigned long tmp;
@@ -479,6 +573,45 @@ 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_set_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);
+}
+
static struct syscore_ops exynos_pm_syscore_ops = {
.suspend = exynos_pm_suspend,
.resume = exynos_pm_resume,
@@ -599,6 +732,16 @@ static struct exynos_pm_data exynos5250_pm_data = {
.cpu_suspend = exynos5250_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",
@@ -612,6 +755,9 @@ static struct of_device_id exynos_pmu_of_device_ids[] = {
}, {
.compatible = "samsung,exynos5250-pmu",
.data = (void *)&exynos5250_pm_data,
+ }, {
+ .compatible = "samsung,exynos5420-pmu",
+ .data = (void *)&exynos5420_pm_data,
},
{ /*sentinel*/ },
};
--
1.7.9.5
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