122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* 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
|
||
|
|
*/
|
||
|
|
#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);
|