mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Dmitry Baryshkov](/assets/img/avatar_default.png)
The kernel should clean stale bits from reset status, so that they won't confuse the bootloader. Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
114 lines
2.5 KiB
C
114 lines
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/time.h>
|
|
|
|
#include <asm/hardware.h>
|
|
#include <asm/memory.h>
|
|
#include <asm/system.h>
|
|
#include <asm/arch/pm.h>
|
|
#include <asm/arch/pxa-regs.h>
|
|
#include <asm/arch/lubbock.h>
|
|
#include <asm/mach/time.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(sleep_save);
|
|
/* before sleeping, calculate and save a checksum */
|
|
for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
|
|
sleep_save_checksum += sleep_save[i];
|
|
}
|
|
|
|
/* Clear reset status */
|
|
RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
|
|
|
|
/* *** go zzz *** */
|
|
pxa_cpu_pm_fns->enter(state);
|
|
cpu_init();
|
|
|
|
if (state != PM_SUSPEND_STANDBY) {
|
|
/* after sleeping, validate the checksum */
|
|
for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
|
|
checksum += sleep_save[i];
|
|
|
|
/* if invalid, display message and wait for a hardware reset */
|
|
if (checksum != sleep_save_checksum) {
|
|
#ifdef CONFIG_ARCH_LUBBOCK
|
|
LUB_HEXLED = 0xbadbadc5;
|
|
#endif
|
|
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);
|
|
|
|
unsigned long sleep_phys_sp(void *sp)
|
|
{
|
|
return virt_to_phys(sp);
|
|
}
|
|
|
|
static int pxa_pm_valid(suspend_state_t state)
|
|
{
|
|
if (pxa_cpu_pm_fns)
|
|
return pxa_cpu_pm_fns->valid(state);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct platform_suspend_ops pxa_pm_ops = {
|
|
.valid = pxa_pm_valid,
|
|
.enter = pxa_pm_enter,
|
|
};
|
|
|
|
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(pxa_cpu_pm_fns->save_size, GFP_KERNEL);
|
|
if (!sleep_save) {
|
|
printk(KERN_ERR "failed to alloc memory for pm save\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
suspend_set_ops(&pxa_pm_ops);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(pxa_pm_init);
|