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 "powerdomain.h"
  32 #include "clockdomain.h"
  33 #include <plat/dmtimer.h>
  34 #include <plat/omap-pm.h>
  35
  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)", clkdm->name,
  87                         clkdm->pwrdm.ptr->name,
  88                         atomic_read(&clkdm->usecount));
  89         seq_printf(s, "\n");
  90
  91         return 0;
  92 }
  93
  94 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  95 {
  96         struct seq_file *s = (struct seq_file *)user;
  97         int i;
  98
  99         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 100                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 101                 strncmp(pwrdm->name, "dpll", 4) == 0)
 102                 return 0;
 103
 104         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
 105                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
 106                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
 107
 108         seq_printf(s, "%s (%s)", pwrdm->name,
 109                         pwrdm_state_names[pwrdm->state]);
 110         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 111                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 112                         pwrdm->state_counter[i]);
 113
 114         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 115         for (i = 0; i < pwrdm->banks; i++)
 116                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 117                                 pwrdm->ret_mem_off_counter[i]);
 118
 119         seq_printf(s, "\n");
 120
 121         return 0;
 122 }
 123
 124 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 125 {
 126         struct seq_file *s = (struct seq_file *)user;
 127         int i;
 128
 129         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 130                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 131                 strncmp(pwrdm->name, "dpll", 4) == 0)
 132                 return 0;
 133
 134         pwrdm_state_switch(pwrdm);
 135
 136         seq_printf(s, "%s (%s)", pwrdm->name,
 137                 pwrdm_state_names[pwrdm->state]);
 138
 139         for (i = 0; i < 4; i++)
 140                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 141                         pwrdm->state_timer[i]);
 142
 143         seq_printf(s, "\n");
 144         return 0;
 145 }
 146
 147 static int pm_dbg_show_counters(struct seq_file *s, void *unused)
 148 {
 149         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 150         clkdm_for_each(clkdm_dbg_show_counter, s);
 151
 152         return 0;
 153 }
 154
 155 static int pm_dbg_show_timers(struct seq_file *s, void *unused)
 156 {
 157         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 158         return 0;
 159 }
 160
 161 static int pm_dbg_open(struct inode *inode, struct file *file)
 162 {
 163         switch ((int)inode->i_private) {
 164         case DEBUG_FILE_COUNTERS:
 165                 return single_open(file, pm_dbg_show_counters,
 166                         &inode->i_private);
 167         case DEBUG_FILE_TIMERS:
 168         default:
 169                 return single_open(file, pm_dbg_show_timers,
 170                         &inode->i_private);
 171         };
 172 }
 173
 174 static const struct file_operations debug_fops = {
 175         .open           = pm_dbg_open,
 176         .read           = seq_read,
 177         .llseek         = seq_lseek,
 178         .release        = single_release,
 179 };
 180
 181 static int pwrdm_suspend_get(void *data, u64 *val)
 182 {
 183         int ret = -EINVAL;
 184
 185         if (cpu_is_omap34xx())
 186                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 187         *val = ret;
 188
 189         if (ret >= 0)
 190                 return 0;
 191         return *val;
 192 }
 193
 194 static int pwrdm_suspend_set(void *data, u64 val)
 195 {
 196         if (cpu_is_omap34xx())
 197                 return omap3_pm_set_suspend_state(
 198                         (struct powerdomain *)data, (int)val);
 199         return -EINVAL;
 200 }
 201
 202 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 203                         pwrdm_suspend_set, "%llu\n");
 204
 205 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 206 {
 207         int i;
 208         s64 t;
 209         struct dentry *d;
 210
 211         t = sched_clock();
 212
 213         for (i = 0; i < 4; i++)
 214                 pwrdm->state_timer[i] = 0;
 215
 216         pwrdm->timer = t;
 217
 218         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 219                 return 0;
 220
 221         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 222         if (!(IS_ERR_OR_NULL(d)))
 223                 (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
 224                         (void *)pwrdm, &pwrdm_suspend_fops);
 225
 226         return 0;
 227 }
 228
 229 static int option_get(void *data, u64 *val)
 230 {
 231         u32 *option = data;
 232
 233         *val = *option;
 234
 235         return 0;
 236 }
 237
 238 static int option_set(void *data, u64 val)
 239 {
 240         u32 *option = data;
 241
 242         *option = val;
 243
 244         if (option == &enable_off_mode) {
 245                 if (val)
 246                         omap_pm_enable_off_mode();
 247                 else
 248                         omap_pm_disable_off_mode();
 249                 if (cpu_is_omap34xx())
 250                         omap3_pm_off_mode_enable(val);
 251         }
 252
 253         return 0;
 254 }
 255
 256 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 257
 258 static int __init pm_dbg_init(void)
 259 {
 260         struct dentry *d;
 261
 262         if (pm_dbg_init_done)
 263                 return 0;
 264
 265         d = debugfs_create_dir("pm_debug", NULL);
 266         if (IS_ERR_OR_NULL(d))
 267                 return PTR_ERR(d);
 268
 269         (void) debugfs_create_file("count", S_IRUGO,
 270                 d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
 271         (void) debugfs_create_file("time", S_IRUGO,
 272                 d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
 273
 274         pwrdm_for_each(pwrdms_setup, (void *)d);
 275
 276         (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 277                                    &enable_off_mode, &pm_dbg_option_fops);
 278         pm_dbg_init_done = 1;
 279
 280         return 0;
 281 }
 282 arch_initcall(pm_dbg_init);
 283
 284 #endif