pm.c
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上传日期:2013-02-24
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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/init.h>
- #include <linux/pm.h>
- #include <linux/sched.h>
- #include <linux/interrupt.h>
- #include <linux/sysctl.h>
- #include <linux/errno.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
- * with the stack location in sleep.S.
- */
- enum { SLEEP_SAVE_START = 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];
- cli();
- 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 resumen");
- #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);
- sti();
- /*
- * 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;
- }
- __initcall(pm_init);
- #endif