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Commit 9bcfb76b authored by Keerthy's avatar Keerthy Committed by Tony Lindgren
Browse files

ARM: OMAP2+: clockdomain: 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: default avatarKeerthy <j-keerthy@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 1096d1c1

arch/arm/mach-omap2/clockdomain.c

+27 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/limits.h>

#include <linux/err.h>

#include <linux/clk-provider.h>

#include <linux/cpu_pm.h>



#include <linux/io.h>
@@ -31,6 +32,7 @@ 
#include "soc.h"

#include "clock.h"

#include "clockdomain.h"

#include "pm.h"



/* clkdm_list contains all registered struct clockdomains */

static LIST_HEAD(clkdm_list);
@@ -39,6 +41,8 @@ static LIST_HEAD(clkdm_list); 
static struct clkdm_autodep *autodeps;



static struct clkdm_ops *arch_clkdm;

void clkdm_save_context(void);

void clkdm_restore_context(void);



/* Private functions */
@@ -449,6 +453,22 @@ int clkdm_register_autodeps(struct clkdm_autodep *ia) 
	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)

			clkdm_save_context();

		break;

	case CPU_CLUSTER_PM_EXIT:

		if (enable_off_mode)

			clkdm_restore_context();

		break;

	}



	return NOTIFY_OK;

}



/**

 * clkdm_complete_init - set up the clockdomain layer

 *
@@ -460,6 +480,7 @@ int clkdm_register_autodeps(struct clkdm_autodep *ia) 
int clkdm_complete_init(void)

{

	struct clockdomain *clkdm;

	static struct notifier_block nb;



	if (list_empty(&clkdm_list))

		return -EACCES;
@@ -474,6 +495,12 @@ int clkdm_complete_init(void) 
		clkdm_clear_all_sleepdeps(clkdm);

	}



	/* Only AM43XX can lose clkdm context during rtc-ddr suspend */

	if (soc_is_am43xx()) {

		nb.notifier_call = cpu_notifier;

		cpu_pm_register_notifier(&nb);

	}



	return 0;

}