arch/arm/mach-omap2/pm-debug.c

   1 /*
   2  * OMAP Power Management debug routines
   3  *
   4  * Copyright (C) 2005 Texas Instruments, Inc.
   5  * Copyright (C) 2006-2008 Nokia Corporation
   6  *
   7  * Written by:
   8  * Richard Woodruff <r-woodruff2@ti.com>
   9  * Tony Lindgren
  10  * Juha Yrjola
  11  * Amit Kucheria <amit.kucheria@nokia.com>
  12  * Igor Stoppa <igor.stoppa@nokia.com>
  13  * Jouni Hogander
  14  *
  15  * Based on pm.c for omap2
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License version 2 as
  19  * published by the Free Software Foundation.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/clk.h>
  25 #include <linux/err.h>
  26 #include <linux/io.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29
  30 #include <plat/clock.h>
  31 #include <plat/board.h>
  32 #include "powerdomain.h"
  33 #include "clockdomain.h"
  34 #include <plat/dmtimer.h>
  35 #include <plat/omap-pm.h>
  36
  37 #include "cm2xxx_3xxx.h"
  38 #include "prm2xxx_3xxx.h"
  39 #include "pm.h"
  40
  41 u32 enable_off_mode;
  42
  43 #ifdef CONFIG_DEBUG_FS
  44 #include <linux/debugfs.h>
  45 #include <linux/seq_file.h>
  46
  47 static int pm_dbg_init_done;
  48
  49 static int pm_dbg_init(void);
  50
  51 enum {
  52         DEBUG_FILE_COUNTERS = 0,
  53         DEBUG_FILE_TIMERS,
  54 };
  55
  56 static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  57         "OFF",
  58         "RET",
  59         "INA",
  60         "ON"
  61 };
  62
  63 #ifdef CONFIG_PM_DEBUG
  64 void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  65 {
  66         s64 t;
  67
  68         if (!pm_dbg_init_done)
  69                 return ;
  70
  71         /* Update timer for previous state */
  72         t = sched_clock();
  73
  74         pwrdm->state_timer[prev] += t - pwrdm->timer;
  75
  76         pwrdm->timer = t;
  77 }
  78 #endif
  79
  80 static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  81 {
  82         struct seq_file *s = (struct seq_file *)user;
  83
  84         if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
  85                 strcmp(clkdm->name, "wkup_clkdm") == 0 ||
  86                 strncmp(clkdm->name, "dpll", 4) == 0)
  87                 return 0;
  88
  89         seq_printf(s, "%s->%s (%d)", clkdm->name,
  90                         clkdm->pwrdm.ptr->name,
  91                         atomic_read(&clkdm->usecount));
  92         seq_printf(s, "\n");
  93
  94         return 0;
  95 }
  96
  97 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  98 {
  99         struct seq_file *s = (struct seq_file *)user;
 100         int i;
 101
 102         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 103                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 104                 strncmp(pwrdm->name, "dpll", 4) == 0)
 105                 return 0;
 106
 107         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
 108                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
 109                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
 110
 111         seq_printf(s, "%s (%s)", pwrdm->name,
 112                         pwrdm_state_names[pwrdm->state]);
 113         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 114                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 115                         pwrdm->state_counter[i]);
 116
 117         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 118         for (i = 0; i < pwrdm->banks; i++)
 119                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 120                                 pwrdm->ret_mem_off_counter[i]);
 121
 122         seq_printf(s, "\n");
 123
 124         return 0;
 125 }
 126
 127 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 128 {
 129 #ifdef CONFIG_PM_DEBUG
 130         struct seq_file *s = (struct seq_file *)user;
 131         int i;
 132
 133         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 134                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 135                 strncmp(pwrdm->name, "dpll", 4) == 0)
 136                 return 0;
 137
 138         pwrdm_state_switch(pwrdm);
 139
 140         seq_printf(s, "%s (%s)", pwrdm->name,
 141                 pwrdm_state_names[pwrdm->state]);
 142
 143         for (i = 0; i < 4; i++)
 144                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 145                         pwrdm->state_timer[i]);
 146
 147         seq_printf(s, "\n");
 148 #endif
 149         return 0;
 150 }
 151
 152 static int pm_dbg_show_counters(struct seq_file *s, void *unused)
 153 {
 154         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 155         clkdm_for_each(clkdm_dbg_show_counter, s);
 156
 157         return 0;
 158 }
 159
 160 static int pm_dbg_show_timers(struct seq_file *s, void *unused)
 161 {
 162         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 163         return 0;
 164 }
 165
 166 static int pm_dbg_open(struct inode *inode, struct file *file)
 167 {
 168         switch ((int)inode->i_private) {
 169         case DEBUG_FILE_COUNTERS:
 170                 return single_open(file, pm_dbg_show_counters,
 171                         &inode->i_private);
 172         case DEBUG_FILE_TIMERS:
 173         default:
 174                 return single_open(file, pm_dbg_show_timers,
 175                         &inode->i_private);
 176         };
 177 }
 178
 179 static const struct file_operations debug_fops = {
 180         .open           = pm_dbg_open,
 181         .read           = seq_read,
 182         .llseek         = seq_lseek,
 183         .release        = single_release,
 184 };
 185
 186 static int pwrdm_suspend_get(void *data, u64 *val)
 187 {
 188         int ret = -EINVAL;
 189
 190         if (cpu_is_omap34xx())
 191                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 192         *val = ret;
 193
 194         if (ret >= 0)
 195                 return 0;
 196         return *val;
 197 }
 198
 199 static int pwrdm_suspend_set(void *data, u64 val)
 200 {
 201         if (cpu_is_omap34xx())
 202                 return omap3_pm_set_suspend_state(
 203                         (struct powerdomain *)data, (int)val);
 204         return -EINVAL;
 205 }
 206
 207 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 208                         pwrdm_suspend_set, "%llu\n");
 209
 210 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 211 {
 212         struct dentry *d;
 213
 214 #ifdef CONFIG_PM_DEBUG
 215         int i;
 216         s64 t;
 217
 218         t = sched_clock();
 219
 220         for (i = 0; i < 4; i++)
 221                 pwrdm->state_timer[i] = 0;
 222
 223         pwrdm->timer = t;
 224 #endif
 225
 226         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 227                 return 0;
 228
 229         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 230         if (!(IS_ERR_OR_NULL(d)))
 231                 (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
 232                         (void *)pwrdm, &pwrdm_suspend_fops);
 233
 234         return 0;
 235 }
 236
 237 static int option_get(void *data, u64 *val)
 238 {
 239         u32 *option = data;
 240
 241         *val = *option;
 242
 243         return 0;
 244 }
 245
 246 static int option_set(void *data, u64 val)
 247 {
 248         u32 *option = data;
 249
 250         *option = val;
 251
 252         if (option == &enable_off_mode) {
 253                 if (val)
 254                         omap_pm_enable_off_mode();
 255                 else
 256                         omap_pm_disable_off_mode();
 257                 if (cpu_is_omap34xx())
 258                         omap3_pm_off_mode_enable(val);
 259         }
 260
 261         return 0;
 262 }
 263
 264 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 265
 266 static int __init pm_dbg_init(void)
 267 {
 268         struct dentry *d;
 269
 270         if (pm_dbg_init_done)
 271                 return 0;
 272
 273         d = debugfs_create_dir("pm_debug", NULL);
 274         if (IS_ERR_OR_NULL(d))
 275                 return PTR_ERR(d);
 276
 277         (void) debugfs_create_file("count", S_IRUGO,
 278                 d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
 279         (void) debugfs_create_file("time", S_IRUGO,
 280                 d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
 281
 282         pwrdm_for_each(pwrdms_setup, (void *)d);
 283
 284         (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 285                                    &enable_off_mode, &pm_dbg_option_fops);
 286         pm_dbg_init_done = 1;
 287
 288         return 0;
 289 }
 290 arch_initcall(pm_dbg_init);
 291
 292 #endif