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
  27 #include <asm/arch/cpu.h>
  28 #include <asm/mach/time.h>
  29 #include <asm/atomic.h>
  30
  31 #include "pm.h"
  32
  33 unsigned short enable_dyn_sleep;
  34 atomic_t sleep_block = ATOMIC_INIT(0);
  35
  36 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  37                          char *buf)
  38 {
  39         return sprintf(buf, "%hu\n", enable_dyn_sleep);
  40 }
  41
  42 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  43                           const char *buf, size_t n)
  44 {
  45         unsigned short value;
  46         if (sscanf(buf, "%hu", &value) != 1 ||
  47             (value != 0 && value != 1)) {
  48                 printk(KERN_ERR "idle_sleep_store: Invalid value\n");
  49                 return -EINVAL;
  50         }
  51         enable_dyn_sleep = value;
  52         return n;
  53 }
  54
  55 static struct kobj_attribute sleep_while_idle_attr =
  56         __ATTR(sleep_while_idle, 0644, idle_show, idle_store);
  57
  58 void omap2_block_sleep(void)
  59 {
  60         atomic_inc(&sleep_block);
  61 }
  62
  63 void omap2_allow_sleep(void)
  64 {
  65         int i;
  66
  67         i = atomic_dec_return(&sleep_block);
  68         BUG_ON(i < 0);
  69 }
  70
  71 int __init omap_pm_init(void)
  72 {
  73         int error = -1;
  74
  75         if (cpu_is_omap24xx())
  76                 error = omap2_pm_init();
  77         if (cpu_is_omap34xx())
  78                 error = omap3_pm_init();
  79         if (error) {
  80                 printk(KERN_ERR "omap2|3_pm_init failed: %d\n", error);
  81                 return error;
  82         }
  83
  84         /* disabled till drivers are fixed */
  85         enable_dyn_sleep = 0;
  86         error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
  87         if (error)
  88                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
  89
  90         return error;
  91 }
  92
  93 late_initcall(omap_pm_init);