This patch adds the support for suspend-to-ram feature of Exynos3250 SoC.
Exynos3250 don't contain the L2 cache.
The measured power-consumption in suspend state:
- before entering suspend : 31mA
- in suspend state : 16mA
Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
This patch is based on v3.19-rc1 and is tested on Exynos3250-based Rinato board.
arch/arm/mach-exynos/regs-pmu.h | 3 ++
arch/arm/mach-exynos/suspend.c | 77 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 80 insertions(+)
diff --git a/arch/arm/mach-exynos/regs-pmu.h b/arch/arm/mach-exynos/regs-pmu.h
index b5f4406..eb461e1 100644
--- a/arch/arm/mach-exynos/regs-pmu.h
+++ b/arch/arm/mach-exynos/regs-pmu.h
@@ -160,12 +160,14 @@
#define EXYNOS5_L2RSTDISABLE_VALUE BIT(3)
#define S5P_PAD_RET_MAUDIO_OPTION 0x3028
+#define S5P_PAD_RET_MMC2_OPTION 0x30c8
#define S5P_PAD_RET_GPIO_OPTION 0x3108
#define S5P_PAD_RET_UART_OPTION 0x3128
#define S5P_PAD_RET_MMCA_OPTION 0x3148
#define S5P_PAD_RET_MMCB_OPTION 0x3168
#define S5P_PAD_RET_EBIA_OPTION 0x3188
#define S5P_PAD_RET_EBIB_OPTION 0x31A8
+#define S5P_PAD_RET_SPI_OPTION 0x31c8
#define S5P_PS_HOLD_CONTROL 0x330C
#define S5P_PS_HOLD_EN (1 << 31)
@@ -326,6 +328,7 @@
(EXYNOS3_ARM_CORE0_OPTION + ((_nr) * 0x80))
#define EXYNOS3_ARM_COMMON_OPTION 0x2408
+#define EXYNOS3_ARM_L2_OPTION 0x2608
#define EXYNOS3_TOP_PWR_OPTION 0x2C48
#define EXYNOS3_CORE_TOP_PWR_OPTION 0x2CA8
#define EXYNOS3_XUSBXTI_DURATION 0x341C
diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c
index f8e7dcd..d6feef3 100644
--- a/arch/arm/mach-exynos/suspend.c
+++ b/arch/arm/mach-exynos/suspend.c
@@ -91,6 +91,12 @@ static unsigned int exynos_pmu_spare3;
static u32 exynos_irqwake_intmask = 0xffffffff;
+static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
+ { 73, BIT(1) }, /* RTC alarm */
+ { 74, BIT(2) }, /* RTC tick */
+ { /* sentinel */ },
+};
+
static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
{ 76, BIT(1) }, /* RTC alarm */
{ 77, BIT(2) }, /* RTC tick */
@@ -114,6 +120,19 @@ unsigned int exynos_release_ret_regs[] = {
REG_TABLE_END,
};
+unsigned int exynos3250_release_ret_regs[] = {
+ S5P_PAD_RET_MAUDIO_OPTION,
+ S5P_PAD_RET_GPIO_OPTION,
+ S5P_PAD_RET_UART_OPTION,
+ S5P_PAD_RET_MMCA_OPTION,
+ S5P_PAD_RET_MMCB_OPTION,
+ S5P_PAD_RET_EBIA_OPTION,
+ S5P_PAD_RET_EBIB_OPTION,
+ S5P_PAD_RET_MMC2_OPTION,
+ S5P_PAD_RET_SPI_OPTION,
+ REG_TABLE_END,
+};
+
unsigned int exynos5420_release_ret_regs[] = {
EXYNOS_PAD_RET_DRAM_OPTION,
EXYNOS_PAD_RET_MAUDIO_OPTION,
@@ -173,6 +192,12 @@ static int exynos_cpu_suspend(unsigned long arg)
return exynos_cpu_do_idle();
}
+static int exynos3250_cpu_suspend(unsigned long arg)
+{
+ flush_cache_all();
+ return exynos_cpu_do_idle();
+}
+
static int exynos5420_cpu_suspend(unsigned long arg)
{
/* MCPM works with HW CPU identifiers */
@@ -230,6 +255,23 @@ static void exynos_pm_prepare(void)
pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
}
+static void exynos3250_pm_prepare(void)
+{
+ unsigned int tmp;
+
+ /* Set wake-up mask registers */
+ exynos_pm_set_wakeup_mask();
+
+ tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
+ tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
+ pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
+
+ exynos_pm_enter_sleep_mode();
+
+ /* ensure at least INFORM0 has the resume address */
+ pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
+}
+
static void exynos5420_pm_prepare(void)
{
unsigned int tmp;
@@ -344,6 +386,28 @@ early_wakeup:
pmu_raw_writel(0x0, S5P_INFORM1);
}
+static void exynos3250_pm_resume(void)
+{
+ u32 cpuid = read_cpuid_part();
+
+ if (exynos_pm_central_resume())
+ goto early_wakeup;
+
+ /* For release retention */
+ exynos_pm_release_retention();
+
+ pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
+
+ if (call_firmware_op(resume) == -ENOSYS
+ && cpuid == ARM_CPU_PART_CORTEX_A9)
+ exynos_cpu_restore_register();
+
+early_wakeup:
+
+ /* Clear SLEEP mode set in INFORM1 */
+ pmu_raw_writel(0x0, S5P_INFORM1);
+}
+
static void exynos5420_prepare_pm_resume(void)
{
if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
@@ -483,6 +547,16 @@ static const struct platform_suspend_ops exynos_suspend_ops = {
.valid = suspend_valid_only_mem,
};
+static const struct exynos_pm_data exynos3250_pm_data = {
+ .wkup_irq = exynos3250_wkup_irq,
+ .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
+ .release_ret_regs = exynos3250_release_ret_regs,
+ .pm_suspend = exynos_pm_suspend,
+ .pm_resume = exynos3250_pm_resume,
+ .pm_prepare = exynos3250_pm_prepare,
+ .cpu_suspend = exynos3250_cpu_suspend,
+};
+
static const struct exynos_pm_data exynos4_pm_data = {
.wkup_irq = exynos4_wkup_irq,
.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
@@ -518,6 +592,9 @@ static struct exynos_pm_data exynos5420_pm_data = {
static struct of_device_id exynos_pmu_of_device_ids[] = {
{
+ .compatible = "samsung,exynos3250-pmu",
+ .data = &exynos3250_pm_data,
+ }, {
.compatible = "samsung,exynos4210-pmu",
.data = &exynos4_pm_data,
}, {
--
1.8.5.5
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