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 #include <plat/omap34xx.h>
  37
  38 #include "prm-regbits-34xx.h"
  39 #include "pm.h"
  40
  41 atomic_t sleep_block = ATOMIC_INIT(0);
  42
  43 static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
  44 static ssize_t idle_store(struct kobject *k, struct kobj_attribute *,
  45                           const char *buf, size_t n);
  46
  47 #ifdef CONFIG_OMAP_PM_SRF
  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 static struct kobj_attribute vdd1_lock_attr =
  57         __ATTR(vdd1_lock, 0644, vdd_opp_show, vdd_opp_store);
  58 static struct kobj_attribute vdd2_lock_attr =
  59         __ATTR(vdd2_lock, 0644, vdd_opp_show, vdd_opp_store);
  60
  61 #endif
  62
  63 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
  64                          char *buf)
  65 {
  66         return -EINVAL;
  67 }
  68
  69 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
  70                           const char *buf, size_t n)
  71 {
  72         unsigned short value;
  73
  74         if (sscanf(buf, "%hu", &value) != 1 ||
  75             (value != 0 && value != 1)) {
  76                 printk(KERN_ERR "idle_store: Invalid value\n");
  77                 return -EINVAL;
  78         }
  79
  80         return n;
  81 }
  82
  83 #ifdef CONFIG_OMAP_PM_SRF
  84 #include <plat/omap34xx.h>
  85 static int vdd1_locked;
  86 static int vdd2_locked;
  87
  88 static ssize_t vdd_opp_show(struct kobject *kobj, struct kobj_attribute *attr,
  89                          char *buf)
  90 {
  91         if (attr == &vdd1_opp_attr)
  92                 return sprintf(buf, "%hu\n", resource_get_level("vdd1_opp"));
  93         else if (attr == &vdd2_opp_attr)
  94                 return sprintf(buf, "%hu\n", resource_get_level("vdd2_opp"));
  95         else if (attr == &vdd1_lock_attr)
  96                 return sprintf(buf, "%hu\n", resource_get_opp_lock(VDD1_OPP));
  97         else if (attr == &vdd2_lock_attr)
  98                 return sprintf(buf, "%hu\n", resource_get_opp_lock(VDD2_OPP));
  99         else
 100                 return -EINVAL;
 101 }
 102
 103 static ssize_t vdd_opp_store(struct kobject *kobj, struct kobj_attribute *attr,
 104                           const char *buf, size_t n)
 105 {
 106         unsigned short value;
 107         int flags = 0;
 108
 109         if (sscanf(buf, "%hu", &value) != 1)
 110                 return -EINVAL;
 111
 112         /* Check locks */
 113         if (attr == &vdd1_lock_attr) {
 114                 flags = OPP_IGNORE_LOCK;
 115                 attr = &vdd1_opp_attr;
 116                 if (vdd1_locked && value == 0) {
 117                         resource_unlock_opp(VDD1_OPP);
 118                         resource_refresh();
 119                         vdd1_locked = 0;
 120                         return n;
 121                 }
 122                 if (vdd1_locked == 0 && value != 0) {
 123                         resource_lock_opp(VDD1_OPP);
 124                         vdd1_locked = 1;
 125                 }
 126         } else if (attr == &vdd2_lock_attr) {
 127                 flags = OPP_IGNORE_LOCK;
 128                 attr = &vdd2_opp_attr;
 129                 if (vdd2_locked && value == 0) {
 130                         resource_unlock_opp(VDD2_OPP);
 131                         resource_refresh();
 132                         vdd2_locked = 0;
 133                         return n;
 134                 }
 135                 if (vdd2_locked == 0 && value != 0) {
 136                         resource_lock_opp(VDD2_OPP);
 137                         vdd2_locked = 1;
 138                 }
 139         }
 140
 141         if (attr == &vdd1_opp_attr) {
 142                 if (value < 1 || value > 5) {
 143                         printk(KERN_ERR "vdd_opp_store: Invalid value\n");
 144                         return -EINVAL;
 145                 }
 146                 resource_set_opp_level(VDD1_OPP, value, flags);
 147         } else if (attr == &vdd2_opp_attr) {
 148                 if (value < 1 || value > 3) {
 149                         printk(KERN_ERR "vdd_opp_store: Invalid value\n");
 150                         return -EINVAL;
 151                 }
 152                 resource_set_opp_level(VDD2_OPP, value, flags);
 153         } else {
 154                 return -EINVAL;
 155         }
 156         return n;
 157 }
 158 #endif
 159
 160 void omap2_block_sleep(void)
 161 {
 162         atomic_inc(&sleep_block);
 163 }
 164
 165 void omap2_allow_sleep(void)
 166 {
 167         int i;
 168
 169         i = atomic_dec_return(&sleep_block);
 170         BUG_ON(i < 0);
 171 }
 172
 173 unsigned get_last_off_on_transaction_id(struct device *dev)
 174 {
 175         struct platform_device *pdev = to_platform_device(dev);
 176         struct omapdev *odev = omapdev_find_pdev(pdev);
 177         struct powerdomain *pwrdm;
 178
 179         if (odev) {
 180                 pwrdm = omapdev_get_pwrdm(odev);
 181                 if (pwrdm)
 182                         return pwrdm->state_counter[0];
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int __init omap_pm_init(void)
 189 {
 190         int error = -1;
 191
 192 #ifdef CONFIG_OMAP_PM_SRF
 193         error = sysfs_create_file(power_kobj,
 194                                   &vdd1_opp_attr.attr);
 195         if (error) {
 196                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 197                 return error;
 198         }
 199         error = sysfs_create_file(power_kobj,
 200                                   &vdd2_opp_attr.attr);
 201         if (error) {
 202                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 203                 return error;
 204         }
 205
 206         error = sysfs_create_file(power_kobj, &vdd1_lock_attr.attr);
 207         if (error) {
 208                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 209                 return error;
 210         }
 211
 212         error = sysfs_create_file(power_kobj, &vdd2_lock_attr.attr);
 213         if (error) {
 214                 printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 215                 return error;
 216         }
 217 #endif
 218
 219         return error;
 220 }
 221 late_initcall(omap_pm_init);