This patch adds the specific exynos_pm_data instance for Exynos5433
in order to support the suspend-to-ram. Exynos5433 SoC need to write
the 'cpu_resume' poiter address and the specific magic number
for suspend mode.
Signed-off-by: Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
drivers/soc/samsung/exynos-pm.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/soc/samsung/exynos-pm.c b/drivers/soc/samsung/exynos-pm.c
index 45d84bbe5e61..70d949ba5cab 100644
--- a/drivers/soc/samsung/exynos-pm.c
+++ b/drivers/soc/samsung/exynos-pm.c
@@ -12,6 +12,7 @@
#include <linux/regulator/machine.h>
#include <linux/syscore_ops.h>
#include <linux/suspend.h>
+#include <linux/psci.h>
#include <asm/cpuidle.h>
#include <asm/io.h>
@@ -123,7 +124,44 @@ static void exynos_pm_finish(void)
#define exynos_pm_data_arm_ptr(data) NULL
#endif
+static int exynos5433_pm_suspend(unsigned long unused)
+{
+ /*
+ * Exynos5433 uses PSCI v0.1 which provides the only one
+ * entry point (psci_ops.cpu_suspend) for both cpuidle and
+ * suspend-to-RAM. Also, PSCI v0.1 needs the specific 'power_state'
+ * parameter for the suspend mode. In order to enter suspend mode,
+ * Exynos5433 calls the 'psci_ops.cpu_suspend' with '0x3010000'
+ * power_state parameter.
+ *
+ * '0x3010000' means that both cluster and system are going to enter
+ * the power-down state as following:
+ * - [25:24] 0x3 : Indicate the cluster and system.
+ * - [16] 0x1 : Indicate power-down state.
+ */
+ return psci_ops.cpu_suspend(0x3010000, __pa_symbol(cpu_resume));
+}
+
+static int exynos5433_pm_suspend_enter(suspend_state_t state)
+{
+ if (!sysram_ns_base_addr)
+ return -EINVAL;
+
+ __raw_writel(virt_to_phys(cpu_resume), sysram_ns_base_addr + 0x8);
+ __raw_writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + 0xc);
+
+ return cpu_suspend(0, exynos5433_pm_suspend);
+}
+
+const struct exynos_pm_data exynos5433_pm_data = {
+ .enter = exynos5433_pm_suspend_enter,
+};
+
static const struct of_device_id exynos_pm_of_device_ids[] = {
+ {
+ .compatible = "samsung,exynos5433-pmu",
+ .data = exynos_pm_data_arm_ptr(exynos5433_pm_data),
+ },
{ /*sentinel*/ },
};
--
1.9.1
--
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