152 lines
3.0 KiB
C
152 lines
3.0 KiB
C
/*
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* SA1100 Power Management Routines
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*
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*
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* History:
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*
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* 2001-02-06: Cliff Brake Initial code
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*
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* 2001-02-25: Sukjae Cho <sjcho@east.isi.edu> &
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* Chester Kuo <chester@linux.org.tw>
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* Save more value for the resume function! Support
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* Bitsy/Assabet/Freebird board
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*
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* 2001-08-29: Nicolas Pitre <nico@cam.org>
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* Cleaned up, pushed platform dependent stuff
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* in the platform specific files.
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*
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* 2002-05-27: Nicolas Pitre Killed sleep.h and the kmalloced save array.
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* Storage is local on the stack now.
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*/
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <asm/hardware.h>
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#include <asm/memory.h>
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#include <asm/system.h>
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#include <asm/mach/time.h>
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extern void sa1100_cpu_suspend(void);
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extern void sa1100_cpu_resume(void);
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#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
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#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
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/*
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* List of global SA11x0 peripheral registers to preserve.
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* More ones like CP and general purpose register values are preserved
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* on the stack and then the stack pointer is stored last in sleep.S.
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*/
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enum { SLEEP_SAVE_SP = 0,
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SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
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SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
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SLEEP_SAVE_Ser1SDCR0,
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SLEEP_SAVE_SIZE
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};
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static int sa11x0_pm_enter(suspend_state_t state)
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{
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unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE];
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struct timespec delta, rtc;
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if (state != PM_SUSPEND_MEM)
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return -EINVAL;
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/* preserve current time */
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rtc.tv_sec = RCNR;
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rtc.tv_nsec = 0;
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save_time_delta(&delta, &rtc);
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gpio = GPLR;
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/* save vital registers */
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SAVE(GPDR);
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SAVE(GAFR);
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SAVE(PPDR);
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SAVE(PPSR);
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SAVE(PPAR);
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SAVE(PSDR);
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SAVE(Ser1SDCR0);
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/* Clear previous reset status */
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RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
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/* set resume return address */
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PSPR = virt_to_phys(sa1100_cpu_resume);
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/* go zzz */
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sa1100_cpu_suspend();
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cpu_init();
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/*
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* Ensure not to come back here if it wasn't intended
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*/
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PSPR = 0;
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/*
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* Ensure interrupt sources are disabled; we will re-init
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* the interrupt subsystem via the device manager.
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*/
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ICLR = 0;
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ICCR = 1;
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ICMR = 0;
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/* restore registers */
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RESTORE(GPDR);
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RESTORE(GAFR);
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RESTORE(PPDR);
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RESTORE(PPSR);
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RESTORE(PPAR);
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RESTORE(PSDR);
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RESTORE(Ser1SDCR0);
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GPSR = gpio;
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GPCR = ~gpio;
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/*
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* Clear the peripheral sleep-hold bit.
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*/
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PSSR = PSSR_PH;
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/* restore current time */
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rtc.tv_sec = RCNR;
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restore_time_delta(&delta, &rtc);
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return 0;
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}
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unsigned long sleep_phys_sp(void *sp)
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{
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return virt_to_phys(sp);
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}
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/*
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* Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
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*/
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static struct pm_ops sa11x0_pm_ops = {
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.pm_disk_mode = PM_DISK_FIRMWARE,
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.enter = sa11x0_pm_enter,
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};
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static int __init sa11x0_pm_init(void)
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{
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pm_set_ops(&sa11x0_pm_ops);
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return 0;
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}
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late_initcall(sa11x0_pm_init);
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