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ARM: OMAP2+: prm44xx: Inroduce cpu_pm notifiers for context save/restore

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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>
This commit is contained in:
Keerthy 2018-05-18 14:10:22 +05:30 committed by Tony Lindgren
parent e37fbf0527
commit a9f7363241
1 changed files with 25 additions and 0 deletions
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25
arch/arm/mach-omap2/prm44xx.c
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@ -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);
}