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/*
* linux/arch/unicore32/kernel/pm.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
* Copyright (C) 2001-2010 Guan Xuetao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/pm.h>
#include "setup.h"
struct puv3_cpu_pm_fns *puv3_cpu_pm_fns;
static unsigned long *sleep_save;
int puv3_pm_enter(suspend_state_t state)
{
unsigned long sleep_save_checksum = 0, checksum = 0;
int i;
/* skip registers saving for standby */
if (state != PM_SUSPEND_STANDBY) {
puv3_cpu_pm_fns->save(sleep_save);
/* before sleeping, calculate and save a checksum */
for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
sleep_save_checksum += sleep_save[i];
}
/* *** go zzz *** */
puv3_cpu_pm_fns->enter(state);
cpu_init();
#ifdef CONFIG_INPUT_KEYBOARD
puv3_ps2_init();
#endif
#ifdef CONFIG_PCI
pci_puv3_preinit();
#endif
if (state != PM_SUSPEND_STANDBY) {
/* after sleeping, validate the checksum */
for (i = 0; i < puv3_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) {
while (1)
puv3_cpu_pm_fns->enter(state);
}
puv3_cpu_pm_fns->restore(sleep_save);
}
pr_debug("*** made it back from resume\n");
return 0;
}
EXPORT_SYMBOL_GPL(puv3_pm_enter);
unsigned long sleep_phys_sp(void *sp)
{
return virt_to_phys(sp);
}
static int puv3_pm_valid(suspend_state_t state)
{
if (puv3_cpu_pm_fns)
return puv3_cpu_pm_fns->valid(state);
return -EINVAL;
}
static int puv3_pm_prepare(void)
{
int ret = 0;
if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare)
ret = puv3_cpu_pm_fns->prepare();
return ret;
}
static void puv3_pm_finish(void)
{
if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish)
puv3_cpu_pm_fns->finish();
}
static struct platform_suspend_ops puv3_pm_ops = {
.valid = puv3_pm_valid,
.enter = puv3_pm_enter,
.prepare = puv3_pm_prepare,
.finish = puv3_pm_finish,
};
static int __init puv3_pm_init(void)
{
if (!puv3_cpu_pm_fns) {
printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n");
return -EINVAL;
}
sleep_save = kmalloc_array(puv3_cpu_pm_fns->save_count,
sizeof(unsigned long),
GFP_KERNEL);
if (!sleep_save) {
printk(KERN_ERR "failed to alloc memory for pm save\n");
return -ENOMEM;
}
suspend_set_ops(&puv3_pm_ops);
return 0;
}
device_initcall(puv3_pm_init);
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