ARM: OMAP2+: prm44xx: Inroduce cpu_pm notifiers for context save/restore
Inroduce cpu_pm notifiers for context save/restore. This will be
needed for am43xx family in case of rtc only mode with ddr in
self-refresh.
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index 18b4955..7b95729 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -12,6 +12,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
@@ -30,6 +31,7 @@
#include "prcm44xx.h"
#include "prminst44xx.h"
#include "powerdomain.h"
+#include "pm.h"
/* Static data */
@@ -768,6 +770,22 @@ void prm_restore_context(void)
omap4_prcm_irq_setup.pm_ctrl);
}
+static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
+{
+ switch (cmd) {
+ case CPU_CLUSTER_PM_ENTER:
+ if (enable_off_mode)
+ prm_save_context();
+ break;
+ case CPU_CLUSTER_PM_EXIT:
+ if (enable_off_mode)
+ prm_restore_context();
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
/*
* XXX document
*/
@@ -788,6 +806,7 @@ static const struct omap_prcm_init_data *prm_init_data;
int __init omap44xx_prm_init(const struct omap_prcm_init_data *data)
{
+ static struct notifier_block nb;
omap_prm_base_init();
prm_init_data = data;
@@ -809,6 +828,12 @@ int __init omap44xx_prm_init(const struct omap_prcm_init_data *data)
omap4_prcm_irq_setup.mask = AM43XX_PRM_IRQENABLE_MPU_OFFSET;
}
+ /* Only AM43XX can lose prm context during rtc-ddr suspend */
+ if (soc_is_am43xx()) {
+ nb.notifier_call = cpu_notifier;
+ cpu_pm_register_notifier(&nb);
+ }
+
return prm_register(&omap44xx_prm_ll_data);
}