LXR linux/arch/arm/mach-pxa/pm.c

   1/*
   2 * PXA250/210 Power Management Routines
   3 *
   4 * Original code for the SA11x0:
   5 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
   6 *
   7 * Modified for the PXA250 by Nicolas Pitre:
   8 * Copyright (c) 2002 Monta Vista Software, Inc.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License.
  12 */
  13#include <linux/init.h>
  14#include <linux/module.h>
  15#include <linux/suspend.h>
  16#include <linux/errno.h>
  17
  18#include <mach/pm.h>
  19
  20struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
  21static unsigned long *sleep_save;
  22
  23int pxa_pm_enter(suspend_state_t state)
  24{
  25        unsigned long sleep_save_checksum = 0, checksum = 0;
  26        int i;
  27
  28#ifdef CONFIG_IWMMXT
  29        /* force any iWMMXt context to ram **/
  30        if (elf_hwcap & HWCAP_IWMMXT)
  31                iwmmxt_task_disable(NULL);
  32#endif
  33
  34        /* skip registers saving for standby */
  35        if (state != PM_SUSPEND_STANDBY) {
  36                pxa_cpu_pm_fns->save(sleep_save);
  37                /* before sleeping, calculate and save a checksum */
  38                for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
  39                        sleep_save_checksum += sleep_save[i];
  40        }
  41
  42        /* *** go zzz *** */
  43        pxa_cpu_pm_fns->enter(state);
  44        cpu_init();
  45
  46        if (state != PM_SUSPEND_STANDBY) {
  47                /* after sleeping, validate the checksum */
  48                for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
  49                        checksum += sleep_save[i];
  50
  51                /* if invalid, display message and wait for a hardware reset */
  52                if (checksum != sleep_save_checksum) {
  53
  54                        lubbock_set_hexled(0xbadbadc5);
  55
  56                        while (1)
  57                                pxa_cpu_pm_fns->enter(state);
  58                }
  59                pxa_cpu_pm_fns->restore(sleep_save);
  60        }
  61
  62        pr_debug("*** made it back from resume\n");
  63
  64        return 0;
  65}
  66
  67EXPORT_SYMBOL_GPL(pxa_pm_enter);
  68
  69unsigned long sleep_phys_sp(void *sp)
  70{
  71        return virt_to_phys(sp);
  72}
  73
  74static int pxa_pm_valid(suspend_state_t state)
  75{
  76        if (pxa_cpu_pm_fns)
  77                return pxa_cpu_pm_fns->valid(state);
  78
  79        return -EINVAL;
  80}
  81
  82int pxa_pm_prepare(void)
  83{
  84        int ret = 0;
  85
  86        if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
  87                ret = pxa_cpu_pm_fns->prepare();
  88
  89        return ret;
  90}
  91
  92void pxa_pm_finish(void)
  93{
  94        if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
  95                pxa_cpu_pm_fns->finish();
  96}
  97
  98static struct platform_suspend_ops pxa_pm_ops = {
  99        .valid          = pxa_pm_valid,
 100        .enter          = pxa_pm_enter,
 101        .prepare        = pxa_pm_prepare,
 102        .finish         = pxa_pm_finish,
 103};
 104
 105static int __init pxa_pm_init(void)
 106{
 107        if (!pxa_cpu_pm_fns) {
 108                printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
 109                return -EINVAL;
 110        }
 111
 112        sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
 113                             GFP_KERNEL);
 114        if (!sleep_save) {
 115                printk(KERN_ERR "failed to alloc memory for pm save\n");
 116                return -ENOMEM;
 117        }
 118
 119        suspend_set_ops(&pxa_pm_ops);
 120        return 0;
 121}
 122
 123device_initcall(pxa_pm_init);
 124