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Commit a83c0b73 authored by Francesco VIRLINZI's avatar Francesco VIRLINZI Committed by Paul Mundt
Browse files

sh: PMB hibernation support 



This implements preliminary suspend/resume support for the PMB.

Signed-off-by: default avatarFrancesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 039a718e

arch/sh/mm/pmb.c

+38 −0
Original line number Diff line number Diff line
@@ -15,6 +15,8 @@ 
 */

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/sysdev.h>

#include <linux/cpu.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/bitops.h>
@@ -402,3 +404,39 @@ static int __init pmb_debugfs_init(void) 
	return 0;

}

postcore_initcall(pmb_debugfs_init);



#ifdef CONFIG_PM

static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state)

{

	static pm_message_t prev_state;



	/* Restore the PMB after a resume from hibernation */

	if (state.event == PM_EVENT_ON &&

	    prev_state.event == PM_EVENT_FREEZE) {

		struct pmb_entry *pmbe;

		spin_lock_irq(&pmb_list_lock);

		for (pmbe = pmb_list; pmbe; pmbe = pmbe->next)

			set_pmb_entry(pmbe);

		spin_unlock_irq(&pmb_list_lock);

	}

	prev_state = state;

	return 0;

}



static int pmb_sysdev_resume(struct sys_device *dev)

{

	return pmb_sysdev_suspend(dev, PMSG_ON);

}



static struct sysdev_driver pmb_sysdev_driver = {

	.suspend = pmb_sysdev_suspend,

	.resume = pmb_sysdev_resume,

};



static int __init pmb_sysdev_init(void)

{

	return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver);

}



subsys_initcall(pmb_sysdev_init);

#endif