/*
|
* SA1100 Power Management Routines
|
*
|
* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
|
*
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License.
|
*
|
* History:
|
*
|
* 2001-02-06: Cliff Brake Initial code
|
*
|
* 2001-02-25: Sukjae Cho <sjcho@east.isi.edu> &
|
* Chester Kuo <chester@linux.org.tw>
|
* Save more value for the resume function! Support
|
* Bitsy/Assabet/Freebird board
|
*
|
* 2001-08-29: Nicolas Pitre <nico@fluxnic.net>
|
* Cleaned up, pushed platform dependent stuff
|
* in the platform specific files.
|
*
|
* 2002-05-27: Nicolas Pitre Killed sleep.h and the kmalloced save array.
|
* Storage is local on the stack now.
|
*/
|
#include <linux/init.h>
|
#include <linux/io.h>
|
#include <linux/suspend.h>
|
#include <linux/errno.h>
|
#include <linux/time.h>
|
|
#include <mach/hardware.h>
|
#include <asm/memory.h>
|
#include <asm/suspend.h>
|
#include <asm/mach/time.h>
|
|
extern int sa1100_finish_suspend(unsigned long);
|
|
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
|
#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
|
|
/*
|
* List of global SA11x0 peripheral registers to preserve.
|
* More ones like CP and general purpose register values are preserved
|
* on the stack and then the stack pointer is stored last in sleep.S.
|
*/
|
enum { SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
|
SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
|
|
SLEEP_SAVE_Ser1SDCR0,
|
|
SLEEP_SAVE_COUNT
|
};
|
|
|
static int sa11x0_pm_enter(suspend_state_t state)
|
{
|
unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];
|
|
gpio = GPLR;
|
|
/* save vital registers */
|
SAVE(GPDR);
|
SAVE(GAFR);
|
|
SAVE(PPDR);
|
SAVE(PPSR);
|
SAVE(PPAR);
|
SAVE(PSDR);
|
|
SAVE(Ser1SDCR0);
|
|
/* Clear previous reset status */
|
RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
|
|
/* set resume return address */
|
PSPR = __pa_symbol(cpu_resume);
|
|
/* go zzz */
|
cpu_suspend(0, sa1100_finish_suspend);
|
|
/*
|
* Ensure not to come back here if it wasn't intended
|
*/
|
RCSR = RCSR_SMR;
|
PSPR = 0;
|
|
/*
|
* Ensure interrupt sources are disabled; we will re-init
|
* the interrupt subsystem via the device manager.
|
*/
|
ICLR = 0;
|
ICCR = 1;
|
ICMR = 0;
|
|
/* restore registers */
|
RESTORE(GPDR);
|
RESTORE(GAFR);
|
|
RESTORE(PPDR);
|
RESTORE(PPSR);
|
RESTORE(PPAR);
|
RESTORE(PSDR);
|
|
RESTORE(Ser1SDCR0);
|
|
GPSR = gpio;
|
GPCR = ~gpio;
|
|
/*
|
* Clear the peripheral sleep-hold bit.
|
*/
|
PSSR = PSSR_PH;
|
|
return 0;
|
}
|
|
static const struct platform_suspend_ops sa11x0_pm_ops = {
|
.enter = sa11x0_pm_enter,
|
.valid = suspend_valid_only_mem,
|
};
|
|
int __init sa11x0_pm_init(void)
|
{
|
suspend_set_ops(&sa11x0_pm_ops);
|
return 0;
|
}
|
