kernel-ark/arch/arm/mach-pxa/pm.c
Eric Miao 711be5ccfe [ARM] 4488/1: pxa: move pxa25x/pxa27x specific code out of pm.c
1. introduce a structure pxa_cpu_pm_fns for pxa25x/pxa27x specific
   operations as follows:

	struct pxa_cpu_pm_fns {
		int	save_size;
		void	(*save)(unsigned long *);
		void	(*restore)(unsigned long *);
		int	(*valid)(suspend_state_t state);
		void	(*enter)(suspend_state_t state);
	}

2. processor specific registers saving and restoring are performed
   by calling the corresponding (*save) and (*restore)

3. pxa_cpu_pm_fns->save_size should be initialized to the required
   size for processor specific registers saving, the allocated
   memory address will be passed to (*save) and (*restore)

   memory allocation happens early in pxa_pm_init(), and save_size
   should be assigned prior to this (which is usually true, since
   pxa_pm_init() happens in device_initcall()

4. there're some redundancies for those SLEEP_SAVE_XXX and related
   macros, will be fixed later, one way possible is for the system
   devices to handle the specific registers saving and restoring

Signed-off-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-07-20 17:25:10 +01:00

112 lines
2.4 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
pxa_cpu_pm_fns->save(sleep_save);
/* Clear sleep reset status */
RCSR = RCSR_SMR;
/* 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];
/* *** go zzz *** */
pxa_cpu_pm_fns->enter(state);
cpu_init();
/* 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 pm_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;
}
pm_set_ops(&pxa_pm_ops);
return 0;
}
device_initcall(pxa_pm_init);