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pm.c

/*
 * PXA250/210 Power Management Routines
 *
 * Original code for the SA11x0:
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * Modified for the PXA250 by Nicolas Pitre:
 * Copyright (c) 2002 Monta Vista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/slab.h>

#include <mach/pm.h>

struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
static unsigned long *sleep_save;

int pxa_pm_enter(suspend_state_t state)
{
      unsigned long sleep_save_checksum = 0, checksum = 0;
      int i;

#ifdef CONFIG_IWMMXT
      /* force any iWMMXt context to ram **/
      if (elf_hwcap & HWCAP_IWMMXT)
            iwmmxt_task_disable(NULL);
#endif

      /* skip registers saving for standby */
      if (state != PM_SUSPEND_STANDBY) {
            pxa_cpu_pm_fns->save(sleep_save);
            /* before sleeping, calculate and save a checksum */
            for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
                  sleep_save_checksum += sleep_save[i];
      }

      /* *** go zzz *** */
      pxa_cpu_pm_fns->enter(state);
      cpu_init();

      if (state != PM_SUSPEND_STANDBY) {
            /* after sleeping, validate the checksum */
            for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
                  checksum += sleep_save[i];

            /* if invalid, display message and wait for a hardware reset */
            if (checksum != sleep_save_checksum) {

                  lubbock_set_hexled(0xbadbadc5);

                  while (1)
                        pxa_cpu_pm_fns->enter(state);
            }
            pxa_cpu_pm_fns->restore(sleep_save);
      }

      pr_debug("*** made it back from resume\n");

      return 0;
}

EXPORT_SYMBOL_GPL(pxa_pm_enter);

unsigned long sleep_phys_sp(void *sp)
{
      return virt_to_phys(sp);
}

static int pxa_pm_valid(suspend_state_t state)
{
      if (pxa_cpu_pm_fns)
            return pxa_cpu_pm_fns->valid(state);

      return -EINVAL;
}

int pxa_pm_prepare(void)
{
      int ret = 0;

      if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
            ret = pxa_cpu_pm_fns->prepare();

      return ret;
}

void pxa_pm_finish(void)
{
      if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
            pxa_cpu_pm_fns->finish();
}

static const struct platform_suspend_ops pxa_pm_ops = {
      .valid            = pxa_pm_valid,
      .enter            = pxa_pm_enter,
      .prepare    = pxa_pm_prepare,
      .finish           = pxa_pm_finish,
};

static int __init pxa_pm_init(void)
{
      if (!pxa_cpu_pm_fns) {
            printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
            return -EINVAL;
      }

      sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
                       GFP_KERNEL);
      if (!sleep_save) {
            printk(KERN_ERR "failed to alloc memory for pm save\n");
            return -ENOMEM;
      }

      suspend_set_ops(&pxa_pm_ops);
      return 0;
}

device_initcall(pxa_pm_init);

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