118 строки
2.5 KiB
C
118 строки
2.5 KiB
C
/*
|
|
* PXA250/210 Power Management Routines
|
|
*
|
|
* Original code for the SA11x0:
|
|
* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
|
|
*
|
|
* Modified for the PXA250 by Nicolas Pitre:
|
|
* Copyright (c) 2002 Monta Vista Software, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "pm.h"
|
|
|
|
struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
|
|
static unsigned long *sleep_save;
|
|
|
|
int pxa_pm_enter(suspend_state_t state)
|
|
{
|
|
unsigned long sleep_save_checksum = 0, checksum = 0;
|
|
int i;
|
|
|
|
#ifdef CONFIG_IWMMXT
|
|
/* force any iWMMXt context to ram **/
|
|
if (elf_hwcap & HWCAP_IWMMXT)
|
|
iwmmxt_task_disable(NULL);
|
|
#endif
|
|
|
|
/* skip registers saving for standby */
|
|
if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
|
|
pxa_cpu_pm_fns->save(sleep_save);
|
|
/* before sleeping, calculate and save a checksum */
|
|
for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
|
|
sleep_save_checksum += sleep_save[i];
|
|
}
|
|
|
|
/* *** go zzz *** */
|
|
pxa_cpu_pm_fns->enter(state);
|
|
|
|
if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
|
|
/* after sleeping, validate the checksum */
|
|
for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
|
|
checksum += sleep_save[i];
|
|
|
|
/* if invalid, display message and wait for a hardware reset */
|
|
if (checksum != sleep_save_checksum) {
|
|
|
|
lubbock_set_hexled(0xbadbadc5);
|
|
|
|
while (1)
|
|
pxa_cpu_pm_fns->enter(state);
|
|
}
|
|
pxa_cpu_pm_fns->restore(sleep_save);
|
|
}
|
|
|
|
pr_debug("*** made it back from resume\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(pxa_pm_enter);
|
|
|
|
static int pxa_pm_valid(suspend_state_t state)
|
|
{
|
|
if (pxa_cpu_pm_fns)
|
|
return pxa_cpu_pm_fns->valid(state);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
int pxa_pm_prepare(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
|
|
ret = pxa_cpu_pm_fns->prepare();
|
|
|
|
return ret;
|
|
}
|
|
|
|
void pxa_pm_finish(void)
|
|
{
|
|
if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
|
|
pxa_cpu_pm_fns->finish();
|
|
}
|
|
|
|
static const struct platform_suspend_ops pxa_pm_ops = {
|
|
.valid = pxa_pm_valid,
|
|
.enter = pxa_pm_enter,
|
|
.prepare = pxa_pm_prepare,
|
|
.finish = pxa_pm_finish,
|
|
};
|
|
|
|
static int __init pxa_pm_init(void)
|
|
{
|
|
if (!pxa_cpu_pm_fns) {
|
|
printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
sleep_save = kmalloc_array(pxa_cpu_pm_fns->save_count,
|
|
sizeof(*sleep_save),
|
|
GFP_KERNEL);
|
|
if (!sleep_save)
|
|
return -ENOMEM;
|
|
|
|
suspend_set_ops(&pxa_pm_ops);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(pxa_pm_init);
|