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sh: PMB hibernation support

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This implements preliminary suspend/resume support for the PMB.

Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Francesco VIRLINZI 2009-03-11 10:39:02 +00:00 • committed by Paul Mundt
parent 039a718ebb
commit a83c0b739f
1 changed files with 38 additions and 0 deletions
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38
arch/sh/mm/pmb.c
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@ -15,6 +15,8 @@
*/ */
#include <linux/init.h> #include <linux/init.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/sysdev.h>
#include <linux/cpu.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/bitops.h> #include <linux/bitops.h>
@ -402,3 +404,39 @@ static int __init pmb_debugfs_init(void)
return 0; return 0;
} }
postcore_initcall(pmb_debugfs_init); 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