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-rw-r--r--arch/arm/mach-omap2/powerdomain.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 1e6a967cd2d5..1a0f69c0a376 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -14,6 +14,7 @@
*/
#undef DEBUG
+#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
@@ -39,6 +40,9 @@
#define PWRDM_TRACE_STATES_FLAG (1<<31)
+void pwrdms_save_context(void);
+void pwrdms_restore_context(void);
+
enum {
PWRDM_STATE_NOW = 0,
PWRDM_STATE_PREV,
@@ -333,6 +337,22 @@ int pwrdm_register_pwrdms(struct powerdomain **ps)
return 0;
}
+static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
+{
+ switch (cmd) {
+ case CPU_CLUSTER_PM_ENTER:
+ if (enable_off_mode)
+ pwrdms_save_context();
+ break;
+ case CPU_CLUSTER_PM_EXIT:
+ if (enable_off_mode)
+ pwrdms_restore_context();
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
/**
* pwrdm_complete_init - set up the powerdomain layer
*
@@ -347,6 +367,7 @@ int pwrdm_register_pwrdms(struct powerdomain **ps)
int pwrdm_complete_init(void)
{
struct powerdomain *temp_p;
+ static struct notifier_block nb;
if (list_empty(&pwrdm_list))
return -EACCES;
@@ -354,6 +375,12 @@ int pwrdm_complete_init(void)
list_for_each_entry(temp_p, &pwrdm_list, node)
pwrdm_set_next_pwrst(temp_p, PWRDM_POWER_ON);
+ /* Only AM43XX can lose pwrdm context during rtc-ddr suspend */
+ if (soc_is_am43xx()) {
+ nb.notifier_call = cpu_notifier;
+ cpu_pm_register_notifier(&nb);
+ }
+
return 0;
}
@@ -1199,3 +1226,63 @@ bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
return 0;
}
+
+/**
+ * pwrdm_save_context - save powerdomain registers
+ *
+ * Register state is going to be lost due to a suspend or hibernate
+ * event. Save the powerdomain registers.
+ */
+static int pwrdm_save_context(struct powerdomain *pwrdm, void *unused)
+{
+ if (arch_pwrdm && arch_pwrdm->pwrdm_save_context)
+ arch_pwrdm->pwrdm_save_context(pwrdm);
+ return 0;
+}
+
+/**
+ * pwrdm_save_context - restore powerdomain registers
+ *
+ * Restore powerdomain control registers after a suspend or resume
+ * event.
+ */
+static int pwrdm_restore_context(struct powerdomain *pwrdm, void *unused)
+{
+ if (arch_pwrdm && arch_pwrdm->pwrdm_restore_context)
+ arch_pwrdm->pwrdm_restore_context(pwrdm);
+ return 0;
+}
+
+static int pwrdm_lost_power(struct powerdomain *pwrdm, void *unused)
+{
+ int state;
+
+ /*
+ * Power has been lost across all powerdomains, increment the
+ * counter.
+ */
+
+ state = pwrdm_read_pwrst(pwrdm);
+ if (state != PWRDM_POWER_OFF) {
+ pwrdm->state_counter[state]++;
+ pwrdm->state_counter[PWRDM_POWER_OFF]++;
+ }
+ pwrdm->state = state;
+
+ return 0;
+}
+
+void pwrdms_save_context(void)
+{
+ pwrdm_for_each(pwrdm_save_context, NULL);
+}
+
+void pwrdms_restore_context(void)
+{
+ pwrdm_for_each(pwrdm_restore_context, NULL);
+}
+
+void pwrdms_lost_power(void)
+{
+ pwrdm_for_each(pwrdm_lost_power, NULL);
+}