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 u32 wakeup_timer_seconds;
  43 u32 wakeup_timer_milliseconds;
  44
  45 void omap2_pm_wakeup_on_timer(u32 seconds, u32 milliseconds)
  46 {
  47         u32 tick_rate, cycles;
  48
  49         if (!seconds && !milliseconds)
  50                 return;
  51
  52         tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
  53         cycles = tick_rate * seconds + tick_rate * milliseconds / 1000;
  54         omap_dm_timer_stop(gptimer_wakeup);
  55         omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);
  56
  57         pr_info("PM: Resume timer in %u.%03u secs"
  58                 " (%d ticks at %d ticks/sec.)\n",
  59                 seconds, milliseconds, cycles, tick_rate);
  60 }
  61
  62 #ifdef CONFIG_DEBUG_FS
  63 #include <linux/debugfs.h>
  64 #include <linux/seq_file.h>
  65
  66 static int pm_dbg_init_done;
  67
  68 static int pm_dbg_init(void);
  69
  70 enum {
  71         DEBUG_FILE_COUNTERS = 0,
  72         DEBUG_FILE_TIMERS,
  73 };
  74
  75 static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  76         "OFF",
  77         "RET",
  78         "INA",
  79         "ON"
  80 };
  81
  82 void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  83 {
  84         s64 t;
  85
  86         if (!pm_dbg_init_done)
  87                 return ;
  88
  89         /* Update timer for previous state */
  90         t = sched_clock();
  91
  92         pwrdm->state_timer[prev] += t - pwrdm->timer;
  93
  94         pwrdm->timer = t;
  95 }
  96
  97 static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  98 {
  99         struct seq_file *s = (struct seq_file *)user;
 100
 101         if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
 102                 strcmp(clkdm->name, "wkup_clkdm") == 0 ||
 103                 strncmp(clkdm->name, "dpll", 4) == 0)
 104                 return 0;
 105
 106         seq_printf(s, "%s->%s (%d)", clkdm->name,
 107                         clkdm->pwrdm.ptr->name,
 108                         atomic_read(&clkdm->usecount));
 109         seq_printf(s, "\n");
 110
 111         return 0;
 112 }
 113
 114 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
 115 {
 116         struct seq_file *s = (struct seq_file *)user;
 117         int i;
 118
 119         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 120                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 121                 strncmp(pwrdm->name, "dpll", 4) == 0)
 122                 return 0;
 123
 124         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
 125                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
 126                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
 127
 128         seq_printf(s, "%s (%s)", pwrdm->name,
 129                         pwrdm_state_names[pwrdm->state]);
 130         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 131                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 132                         pwrdm->state_counter[i]);
 133
 134         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 135         for (i = 0; i < pwrdm->banks; i++)
 136                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 137                                 pwrdm->ret_mem_off_counter[i]);
 138
 139         seq_printf(s, "\n");
 140
 141         return 0;
 142 }
 143
 144 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 145 {
 146         struct seq_file *s = (struct seq_file *)user;
 147         int i;
 148
 149         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 150                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 151                 strncmp(pwrdm->name, "dpll", 4) == 0)
 152                 return 0;
 153
 154         pwrdm_state_switch(pwrdm);
 155
 156         seq_printf(s, "%s (%s)", pwrdm->name,
 157                 pwrdm_state_names[pwrdm->state]);
 158
 159         for (i = 0; i < 4; i++)
 160                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 161                         pwrdm->state_timer[i]);
 162
 163         seq_printf(s, "\n");
 164         return 0;
 165 }
 166
 167 static int pm_dbg_show_counters(struct seq_file *s, void *unused)
 168 {
 169         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 170         clkdm_for_each(clkdm_dbg_show_counter, s);
 171
 172         return 0;
 173 }
 174
 175 static int pm_dbg_show_timers(struct seq_file *s, void *unused)
 176 {
 177         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 178         return 0;
 179 }
 180
 181 static int pm_dbg_open(struct inode *inode, struct file *file)
 182 {
 183         switch ((int)inode->i_private) {
 184         case DEBUG_FILE_COUNTERS:
 185                 return single_open(file, pm_dbg_show_counters,
 186                         &inode->i_private);
 187         case DEBUG_FILE_TIMERS:
 188         default:
 189                 return single_open(file, pm_dbg_show_timers,
 190                         &inode->i_private);
 191         };
 192 }
 193
 194 static const struct file_operations debug_fops = {
 195         .open           = pm_dbg_open,
 196         .read           = seq_read,
 197         .llseek         = seq_lseek,
 198         .release        = single_release,
 199 };
 200
 201 static int pwrdm_suspend_get(void *data, u64 *val)
 202 {
 203         int ret = -EINVAL;
 204
 205         if (cpu_is_omap34xx())
 206                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 207         *val = ret;
 208
 209         if (ret >= 0)
 210                 return 0;
 211         return *val;
 212 }
 213
 214 static int pwrdm_suspend_set(void *data, u64 val)
 215 {
 216         if (cpu_is_omap34xx())
 217                 return omap3_pm_set_suspend_state(
 218                         (struct powerdomain *)data, (int)val);
 219         return -EINVAL;
 220 }
 221
 222 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 223                         pwrdm_suspend_set, "%llu\n");
 224
 225 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 226 {
 227         int i;
 228         s64 t;
 229         struct dentry *d;
 230
 231         t = sched_clock();
 232
 233         for (i = 0; i < 4; i++)
 234                 pwrdm->state_timer[i] = 0;
 235
 236         pwrdm->timer = t;
 237
 238         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 239                 return 0;
 240
 241         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 242
 243         (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
 244                         (void *)pwrdm, &pwrdm_suspend_fops);
 245
 246         return 0;
 247 }
 248
 249 static int option_get(void *data, u64 *val)
 250 {
 251         u32 *option = data;
 252
 253         *val = *option;
 254
 255         return 0;
 256 }
 257
 258 static int option_set(void *data, u64 val)
 259 {
 260         u32 *option = data;
 261
 262         if (option == &wakeup_timer_milliseconds && val >= 1000)
 263                 return -EINVAL;
 264
 265         *option = val;
 266
 267         if (option == &enable_off_mode) {
 268                 if (val)
 269                         omap_pm_enable_off_mode();
 270                 else
 271                         omap_pm_disable_off_mode();
 272                 if (cpu_is_omap34xx())
 273                         omap3_pm_off_mode_enable(val);
 274         }
 275
 276         return 0;
 277 }
 278
 279 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 280
 281 static int __init pm_dbg_init(void)
 282 {
 283         struct dentry *d;
 284
 285         if (pm_dbg_init_done)
 286                 return 0;
 287
 288         d = debugfs_create_dir("pm_debug", NULL);
 289         if (IS_ERR(d))
 290                 return PTR_ERR(d);
 291
 292         (void) debugfs_create_file("count", S_IRUGO,
 293                 d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
 294         (void) debugfs_create_file("time", S_IRUGO,
 295                 d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
 296
 297         pwrdm_for_each(pwrdms_setup, (void *)d);
 298
 299         (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 300                                    &enable_off_mode, &pm_dbg_option_fops);
 301         (void) debugfs_create_file("wakeup_timer_seconds", S_IRUGO | S_IWUSR, d,
 302                                    &wakeup_timer_seconds, &pm_dbg_option_fops);
 303         (void) debugfs_create_file("wakeup_timer_milliseconds",
 304                         S_IRUGO | S_IWUSR, d, &wakeup_timer_milliseconds,
 305                         &pm_dbg_option_fops);
 306         pm_dbg_init_done = 1;
 307
 308         return 0;
 309 }
 310 arch_initcall(pm_dbg_init);
 311
 312 #endif