arch/arm/mach-omap2/pm.c

   1 /*
   2  * linux/arch/arm/mach-omap2/pm.c
   3  *
   4  * OMAP Power Management Common Routines
   5  *
   6  * Copyright (C) 2005 Texas Instruments, Inc.
   7  * Copyright (C) 2006-2008 Nokia Corporation
   8  *
   9  * Written by:
  10  * Richard Woodruff <r-woodruff2@ti.com>
  11  * Tony Lindgren
  12  * Juha Yrjola
  13  * Amit Kucheria <amit.kucheria@nokia.com>
  14  * Igor Stoppa <igor.stoppa@nokia.com>
  15  * Jouni Hogander
  16  *
  17  * Based on pm.c for omap1
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License version 2 as
  21  * published by the Free Software Foundation.
  22  */
  23
  24 #include <linux/suspend.h>
  25 #include <linux/time.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <plat/cpu.h>
  29 #include <asm/mach/time.h>
  30 #include <asm/atomic.h>
  31
  32 #include <plat/powerdomain.h>
  33 #include <plat/omapdev.h>
  34
  35 #include "prm-regbits-34xx.h"
  36 #include "pm.h"
  37
  38 atomic_t sleep_block = ATOMIC_INIT(0);
  39
  40 static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
  41 static ssize_t idle_store(struct kobject *k, struct kobj_attribute *,
  42                           const char *buf, size_t n);
  43
  44 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  45                          char *buf)
  46 {
  47         return -EINVAL;
  48 }
  49
  50 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  51                           const char *buf, size_t n)
  52 {
  53         unsigned short value;
  54
  55         if (sscanf(buf, "%hu", &value) != 1 ||
  56             (value != 0 && value != 1)) {
  57                 printk(KERN_ERR "idle_store: Invalid value\n");
  58                 return -EINVAL;
  59         }
  60
  61         return n;
  62 }
  63
  64 void omap2_block_sleep(void)
  65 {
  66         atomic_inc(&sleep_block);
  67 }
  68
  69 void omap2_allow_sleep(void)
  70 {
  71         int i;
  72
  73         i = atomic_dec_return(&sleep_block);
  74         BUG_ON(i < 0);
  75 }
  76
  77 unsigned get_last_off_on_transaction_id(struct device *dev)
  78 {
  79         struct platform_device *pdev = to_platform_device(dev);
  80         struct omapdev *odev = omapdev_find_pdev(pdev);
  81         struct powerdomain *pwrdm;
  82
  83         if (odev) {
  84                 pwrdm = omapdev_get_pwrdm(odev);
  85                 if (pwrdm)
  86                         return pwrdm->state_counter[0];
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int __init omap_pm_init(void)
  93 {
  94         int error = -1;
  95
  96         return error;
  97 }
  98 late_initcall(omap_pm_init);