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#include <linux/slab.h>
  18
  19#include <mach/pm.h>
  20
  21struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
  22static unsigned long *sleep_save;
  23
  24int pxa_pm_enter(suspend_state_t state)
  25{
  26        unsigned long sleep_save_checksum = 0, checksum = 0;
  27        int i;
  28
  29#ifdef CONFIG_IWMMXT
  30        /* force any iWMMXt context to ram **/
  31        if (elf_hwcap & HWCAP_IWMMXT)
  32                iwmmxt_task_disable(NULL);
  33#endif
  34
  35        /* skip registers saving for standby */
  36        if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
  37                pxa_cpu_pm_fns->save(sleep_save);
  38                /* before sleeping, calculate and save a checksum */
  39                for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
  40                        sleep_save_checksum += sleep_save[i];
  41        }
  42
  43        /* *** go zzz *** */
  44        pxa_cpu_pm_fns->enter(state);
  45        cpu_init();
  46
  47        if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
  48                /* after sleeping, validate the checksum */
  49                for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
  50                        checksum += sleep_save[i];
  51
  52                /* if invalid, display message and wait for a hardware reset */
  53                if (checksum != sleep_save_checksum) {
  54
  55                        lubbock_set_hexled(0xbadbadc5);
  56
  57                        while (1)
  58                                pxa_cpu_pm_fns->enter(state);
  59                }
  60                pxa_cpu_pm_fns->restore(sleep_save);
  61        }
  62
  63        pr_debug("*** made it back from resume\n");
  64
  65        return 0;
  66}
  67
  68EXPORT_SYMBOL_GPL(pxa_pm_enter);
  69
  70unsigned long sleep_phys_sp(void *sp)
  71{
  72        return virt_to_phys(sp);
  73}
  74
  75static int pxa_pm_valid(suspend_state_t state)
  76{
  77        if (pxa_cpu_pm_fns)
  78                return pxa_cpu_pm_fns->valid(state);
  79
  80        return -EINVAL;
  81}
  82
  83int pxa_pm_prepare(void)
  84{
  85        int ret = 0;
  86
  87        if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
  88                ret = pxa_cpu_pm_fns->prepare();
  89
  90        return ret;
  91}
  92
  93void pxa_pm_finish(void)
  94{
  95        if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
  96                pxa_cpu_pm_fns->finish();
  97}
  98
  99static const struct platform_suspend_ops pxa_pm_ops = {
 100        .valid          = pxa_pm_valid,
 101        .enter          = pxa_pm_enter,
 102        .prepare        = pxa_pm_prepare,
 103        .finish         = pxa_pm_finish,
 104};
 105
 106static int __init pxa_pm_init(void)
 107{
 108        if (!pxa_cpu_pm_fns) {
 109                printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
 110                return -EINVAL;
 111        }
 112
 113        sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
 114                             GFP_KERNEL);
 115        if (!sleep_save) {
 116                printk(KERN_ERR "failed to alloc memory for pm save\n");
 117                return -ENOMEM;
 118        }
 119
 120        suspend_set_ops(&pxa_pm_ops);
 121        return 0;
 122}
 123
 124device_initcall(pxa_pm_init);
 125