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 #include <linux/device.h>
  28
  29 #include <plat/cpu.h>
  30 #include <asm/mach/time.h>
  31 #include <asm/atomic.h>
  32
  33 #include <plat/powerdomain.h>
  34 #include <plat/omapdev.h>
  35 #include <plat/resource.h>
  36
  37 #include "prm-regbits-34xx.h"
  38 #include "pm.h"
  39
  40 atomic_t sleep_block = ATOMIC_INIT(0);
  41
  42 static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
  43 static ssize_t idle_store(struct kobject *k, struct kobj_attribute *,
  44                           const char *buf, size_t n);
  45
  46 #ifdef CONFIG_OMAP_PM_SRF
  47 static ssize_t vdd_opp_show(struct kobject *, struct kobj_attribute *, char *);
  48 static ssize_t vdd_opp_store(struct kobject *k, struct kobj_attribute *,
  49                           const char *buf, size_t n);
  50 static struct kobj_attribute vdd1_opp_attr =
  51         __ATTR(vdd1_opp, 0644, vdd_opp_show, vdd_opp_store);
  52
  53 static struct kobj_attribute vdd2_opp_attr =
  54         __ATTR(vdd2_opp, 0644, vdd_opp_show, vdd_opp_store);
  55 #endif
  56
  57 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  58                          char *buf)
  59 {
  60         return -EINVAL;
  61 }
  62
  63 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  64                           const char *buf, size_t n)
  65 {
  66         unsigned short value;
  67
  68         if (sscanf(buf, "%hu", &value) != 1 ||
  69             (value != 0 && value != 1)) {
  70                 printk(KERN_ERR "idle_store: Invalid value\n");
  71                 return -EINVAL;
  72         }
  73
  74         return n;
  75 }
  76
  77 #ifdef CONFIG_OMAP_PM_SRF
  78 static ssize_t vdd_opp_show(struct kobject *kobj, struct kobj_attribute *attr,
  79                          char *buf)
  80 {
  81         if (attr == &vdd1_opp_attr)
  82                 return sprintf(buf, "%hu\n", resource_get_level("vdd1_opp"));
  83         else if (attr == &vdd2_opp_attr)
  84                 return sprintf(buf, "%hu\n", resource_get_level("vdd2_opp"));
  85         else
  86                 return -EINVAL;
  87 }
  88
  89 static ssize_t vdd_opp_store(struct kobject *kobj, struct kobj_attribute *attr,
  90                           const char *buf, size_t n)
  91 {
  92         unsigned short value;
  93
  94         if (sscanf(buf, "%hu", &value) != 1)
  95                 return -EINVAL;
  96
  97         if (attr == &vdd1_opp_attr) {
  98                 if (value < 1 || value > 5) {
  99                         printk(KERN_ERR "vdd_opp_store: Invalid value\n");
 100                         return -EINVAL;
 101                 }
 102                 set_opp_level(VDD1_OPP, value);
 103         } else if (attr == &vdd2_opp_attr) {
 104                 if (value < 2 || value > 3) {
 105                         printk(KERN_ERR "vdd_opp_store: Invalid value\n");
 106                         return -EINVAL;
 107                 }
 108                 set_opp_level(VDD2_OPP, value);
 109         } else {
 110                 return -EINVAL;
 111         }
 112         return n;
 113 }
 114 #endif
 115
 116 void omap2_block_sleep(void)
 117 {
 118         atomic_inc(&sleep_block);
 119 }
 120
 121 void omap2_allow_sleep(void)
 122 {
 123         int i;
 124
 125         i = atomic_dec_return(&sleep_block);
 126         BUG_ON(i < 0);
 127 }
 128
 129 unsigned get_last_off_on_transaction_id(struct device *dev)
 130 {
 131         struct platform_device *pdev = to_platform_device(dev);
 132         struct omapdev *odev = omapdev_find_pdev(pdev);
 133         struct powerdomain *pwrdm;
 134
 135         if (odev) {
 136                 pwrdm = omapdev_get_pwrdm(odev);
 137                 if (pwrdm)
 138                         return pwrdm->state_counter[0];
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int __init omap_pm_init(void)
 145 {
 146         int error = -1;
 147
 148 #ifdef CONFIG_OMAP_PM_SRF
 149         error = sysfs_create_file(power_kobj,
 150                                   &vdd1_opp_attr.attr);
 151         if (error) {
 152                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 153                 return error;
 154         }
 155         error = sysfs_create_file(power_kobj,
 156                                   &vdd2_opp_attr.attr);
 157         if (error) {
 158                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 159                 return error;
 160         }
 161 #endif
 162
 163         return error;
 164 }
 165 late_initcall(omap_pm_init);