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