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