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pm44xx.c

/*
 * OMAP4 Power Management Routines
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/slab.h>

#include "powerdomain.h"
#include <mach/omap4-common.h>

struct power_state {
      struct powerdomain *pwrdm;
      u32 next_state;
#ifdef CONFIG_SUSPEND
      u32 saved_state;
#endif
      struct list_head node;
};

static LIST_HEAD(pwrst_list);

#ifdef CONFIG_SUSPEND
static int omap4_pm_suspend(void)
{
      do_wfi();
      return 0;
}

static int omap4_pm_enter(suspend_state_t suspend_state)
{
      int ret = 0;

      switch (suspend_state) {
      case PM_SUSPEND_STANDBY:
      case PM_SUSPEND_MEM:
            ret = omap4_pm_suspend();
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

static int omap4_pm_begin(suspend_state_t state)
{
      disable_hlt();
      return 0;
}

static void omap4_pm_end(void)
{
      enable_hlt();
      return;
}

static const struct platform_suspend_ops omap_pm_ops = {
      .begin            = omap4_pm_begin,
      .end        = omap4_pm_end,
      .enter            = omap4_pm_enter,
      .valid            = suspend_valid_only_mem,
};
#endif /* CONFIG_SUSPEND */

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
{
      struct power_state *pwrst;

      if (!pwrdm->pwrsts)
            return 0;

      pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
      if (!pwrst)
            return -ENOMEM;
      pwrst->pwrdm = pwrdm;
      pwrst->next_state = PWRDM_POWER_ON;
      list_add(&pwrst->node, &pwrst_list);

      return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
}

/**
 * omap4_pm_init - Init routine for OMAP4 PM
 *
 * Initializes all powerdomain and clockdomain target states
 * and all PRCM settings.
 */
static int __init omap4_pm_init(void)
{
      int ret;

      if (!cpu_is_omap44xx())
            return -ENODEV;

      pr_err("Power Management for TI OMAP4.\n");

#ifdef CONFIG_PM
      ret = pwrdm_for_each(pwrdms_setup, NULL);
      if (ret) {
            pr_err("Failed to setup powerdomains\n");
            goto err2;
      }
#endif

#ifdef CONFIG_SUSPEND
      suspend_set_ops(&omap_pm_ops);
#endif /* CONFIG_SUSPEND */

err2:
      return ret;
}
late_initcall(omap4_pm_init);

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