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/*
* 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@cam.org>
* 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/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/sysctl.h>
#include <linux/errno.h>
#include <linux/cpufreq.h>
#include <asm/hardware.h>
#include <asm/memory.h>
#include <asm/system.h>
#include <asm/leds.h>
/*
* Debug macros
*/
#undef DEBUG
extern void sa1100_cpu_suspend(void);
extern void sa1100_cpu_resume(void);
#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_SP = 0,
SLEEP_SAVE_OSCR, SLEEP_SAVE_OIER,
SLEEP_SAVE_OSMR0, SLEEP_SAVE_OSMR1, SLEEP_SAVE_OSMR2, SLEEP_SAVE_OSMR3,
SLEEP_SAVE_GPDR, SLEEP_SAVE_GRER, SLEEP_SAVE_GFER, SLEEP_SAVE_GAFR,
SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
SLEEP_SAVE_ICMR,
SLEEP_SAVE_Ser1SDCR0,
SLEEP_SAVE_SIZE
};
int pm_do_suspend(void)
{
unsigned long sleep_save[SLEEP_SAVE_SIZE];
local_irq_disable();
leds_event(led_stop);
/* preserve current time */
RCNR = xtime.tv_sec;
/* save vital registers */
SAVE(OSCR);
SAVE(OSMR0);
SAVE(OSMR1);
SAVE(OSMR2);
SAVE(OSMR3);
SAVE(OIER);
SAVE(GPDR);
SAVE(GRER);
SAVE(GFER);
SAVE(GAFR);
SAVE(PPDR);
SAVE(PPSR);
SAVE(PPAR);
SAVE(PSDR);
SAVE(Ser1SDCR0);
SAVE(ICMR);
/* ... maybe a global variable initialized by arch code to set this? */
GRER = PWER;
GFER = 0;
GEDR = GEDR;
/* Clear previous reset status */
RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
/* set resume return address */
PSPR = virt_to_phys(sa1100_cpu_resume);
/* go zzz */
sa1100_cpu_suspend();
/* ensure not to come back here if it wasn't intended */
PSPR = 0;
#ifdef DEBUG
printk(KERN_DEBUG "*** made it back from resume\n");
#endif
/* restore registers */
RESTORE(GPDR);
RESTORE(GRER);
RESTORE(GFER);
RESTORE(GAFR);
/* clear any edge detect bit */
GEDR = GEDR;
RESTORE(PPDR);
RESTORE(PPSR);
RESTORE(PPAR);
RESTORE(PSDR);
RESTORE(Ser1SDCR0);
PSSR = PSSR_PH;
RESTORE(OSMR0);
RESTORE(OSMR1);
RESTORE(OSMR2);
RESTORE(OSMR3);
RESTORE(OSCR);
RESTORE(OIER);
ICLR = 0;
ICCR = 1;
RESTORE(ICMR);
/* restore current time */
xtime.tv_sec = RCNR;
leds_event(led_start);
local_irq_enable();
/*
* Restore the CPU frequency settings.
*/
#ifdef CONFIG_CPU_FREQ
cpufreq_restore();
#endif
return 0;
}
unsigned long sleep_phys_sp(void *sp)
{
return virt_to_phys(sp);
}
#ifdef CONFIG_SYSCTL
/*
* ARGH! ACPI people defined CTL_ACPI in linux/acpi.h rather than
* linux/sysctl.h.
*
* This means our interface here won't survive long - it needs a new
* interface. Quick hack to get this working - use sysctl id 9999.
*/
#warning ACPI broke the kernel, this interface needs to be fixed up.
#define CTL_ACPI 9999
#define ACPI_S1_SLP_TYP 19
/*
* Send us to sleep.
*/
static int sysctl_pm_do_suspend(void)
{
int retval;
retval = pm_send_all(PM_SUSPEND, (void *)3);
if (retval == 0) {
retval = pm_do_suspend();
pm_send_all(PM_RESUME, (void *)0);
}
return retval;
}
static struct ctl_table pm_table[] =
{
{ACPI_S1_SLP_TYP, "suspend", NULL, 0, 0600, NULL, (proc_handler *)&sysctl_pm_do_suspend},
{0}
};
static struct ctl_table pm_dir_table[] =
{
{CTL_ACPI, "pm", NULL, 0, 0555, pm_table},
{0}
};
/*
* Initialize power interface
*/
static int __init pm_init(void)
{
register_sysctl_table(pm_dir_table, 1);
return 0;
}
fs_initcall(pm_init);
#endif
EXPORT_SYMBOL(pm_do_suspend);