kernel/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 "clock.h"
  31 #include "powerdomain.h"
  32 #include "clockdomain.h"
  33 #include "omap-pm.h"
  34
  35 #include "soc.h"
  36 #include "cm2xxx_3xxx.h"
  37 #include "prm2xxx_3xxx.h"
  38 #include "pm.h"
  39
  40 u32 enable_off_mode;
  41
  42 #ifdef CONFIG_DEBUG_FS
  43 #include <linux/debugfs.h>
  44 #include <linux/seq_file.h>
  45
  46 static int pm_dbg_init_done;
  47
  48 static int pm_dbg_init(void);
  49
  50 enum {
  51         DEBUG_FILE_COUNTERS = 0,
  52         DEBUG_FILE_TIMERS,
  53 };
  54
  55 static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  56         "OFF",
  57         "RET",
  58         "INA",
  59         "ON"
  60 };
  61
  62 void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  63 {
  64         s64 t;
  65
  66         if (!pm_dbg_init_done)
  67                 return ;
  68
  69         /* Update timer for previous state */
  70         t = sched_clock();
  71
  72         pwrdm->state_timer[prev] += t - pwrdm->timer;
  73
  74         pwrdm->timer = t;
  75 }
  76
  77 static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  78 {
  79         struct seq_file *s = (struct seq_file *)user;
  80
  81         if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
  82                 strcmp(clkdm->name, "wkup_clkdm") == 0 ||
  83                 strncmp(clkdm->name, "dpll", 4) == 0)
  84                 return 0;
  85
  86         seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm->pwrdm.ptr->name,
  87                    clkdm->usecount);
  88
  89         return 0;
  90 }
  91
  92 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  93 {
  94         struct seq_file *s = (struct seq_file *)user;
  95         int i;
  96
  97         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
  98                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
  99                 strncmp(pwrdm->name, "dpll", 4) == 0)
 100                 return 0;
 101
 102         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
 103                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
 104                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
 105
 106         seq_printf(s, "%s (%s)", pwrdm->name,
 107                         pwrdm_state_names[pwrdm->state]);
 108         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 109                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 110                         pwrdm->state_counter[i]);
 111
 112         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 113         for (i = 0; i < pwrdm->banks; i++)
 114                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 115                                 pwrdm->ret_mem_off_counter[i]);
 116
 117         seq_printf(s, "\n");
 118
 119         return 0;
 120 }
 121
 122 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 123 {
 124         struct seq_file *s = (struct seq_file *)user;
 125         int i;
 126
 127         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 128                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 129                 strncmp(pwrdm->name, "dpll", 4) == 0)
 130                 return 0;
 131
 132         pwrdm_state_switch(pwrdm);
 133
 134         seq_printf(s, "%s (%s)", pwrdm->name,
 135                 pwrdm_state_names[pwrdm->state]);
 136
 137         for (i = 0; i < 4; i++)
 138                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 139                         pwrdm->state_timer[i]);
 140
 141         seq_printf(s, "\n");
 142         return 0;
 143 }
 144
 145 static int pm_dbg_show_counters(struct seq_file *s, void *unused)
 146 {
 147         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 148         clkdm_for_each(clkdm_dbg_show_counter, s);
 149
 150         return 0;
 151 }
 152
 153 static int pm_dbg_show_timers(struct seq_file *s, void *unused)
 154 {
 155         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 156         return 0;
 157 }
 158
 159 static int pm_dbg_open(struct inode *inode, struct file *file)
 160 {
 161         switch ((int)inode->i_private) {
 162         case DEBUG_FILE_COUNTERS:
 163                 return single_open(file, pm_dbg_show_counters,
 164                         &inode->i_private);
 165         case DEBUG_FILE_TIMERS:
 166         default:
 167                 return single_open(file, pm_dbg_show_timers,
 168                         &inode->i_private);
 169         }
 170 }
 171
 172 static const struct file_operations debug_fops = {
 173         .open           = pm_dbg_open,
 174         .read           = seq_read,
 175         .llseek         = seq_lseek,
 176         .release        = single_release,
 177 };
 178
 179 static int pwrdm_suspend_get(void *data, u64 *val)
 180 {
 181         int ret = -EINVAL;
 182
 183         if (cpu_is_omap34xx())
 184                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 185         *val = ret;
 186
 187         if (ret >= 0)
 188                 return 0;
 189         return *val;
 190 }
 191
 192 static int pwrdm_suspend_set(void *data, u64 val)
 193 {
 194         if (cpu_is_omap34xx())
 195                 return omap3_pm_set_suspend_state(
 196                         (struct powerdomain *)data, (int)val);
 197         return -EINVAL;
 198 }
 199
 200 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 201                         pwrdm_suspend_set, "%llu\n");
 202
 203 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 204 {
 205         int i;
 206         s64 t;
 207         struct dentry *d;
 208
 209         t = sched_clock();
 210
 211         for (i = 0; i < 4; i++)
 212                 pwrdm->state_timer[i] = 0;
 213
 214         pwrdm->timer = t;
 215
 216         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 217                 return 0;
 218
 219         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 220         if (d)
 221                 (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
 222                         (void *)pwrdm, &pwrdm_suspend_fops);
 223
 224         return 0;
 225 }
 226
 227 static int option_get(void *data, u64 *val)
 228 {
 229         u32 *option = data;
 230
 231         *val = *option;
 232
 233         return 0;
 234 }
 235
 236 static int option_set(void *data, u64 val)
 237 {
 238         u32 *option = data;
 239
 240         *option = val;
 241
 242         if (option == &enable_off_mode) {
 243                 if (val)
 244                         omap_pm_enable_off_mode();
 245                 else
 246                         omap_pm_disable_off_mode();
 247                 if (cpu_is_omap34xx())
 248                         omap3_pm_off_mode_enable(val);
 249         }
 250
 251         return 0;
 252 }
 253
 254 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 255
 256 static int __init pm_dbg_init(void)
 257 {
 258         struct dentry *d;
 259
 260         if (pm_dbg_init_done)
 261                 return 0;
 262
 263         d = debugfs_create_dir("pm_debug", NULL);
 264         if (!d)
 265                 return -EINVAL;
 266
 267         (void) debugfs_create_file("count", S_IRUGO,
 268                 d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
 269         (void) debugfs_create_file("time", S_IRUGO,
 270                 d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
 271
 272         pwrdm_for_each(pwrdms_setup, (void *)d);
 273
 274         (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 275                                    &enable_off_mode, &pm_dbg_option_fops);
 276         pm_dbg_init_done = 1;
 277
 278         return 0;
 279 }
 280 omap_arch_initcall(pm_dbg_init);
 281
 282 #endif