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_putc(s, '\n');
 118         return 0;
 119 }
 120
 121 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 122 {
 123         struct seq_file *s = (struct seq_file *)user;
 124         int i;
 125
 126         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 127                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 128                 strncmp(pwrdm->name, "dpll", 4) == 0)
 129                 return 0;
 130
 131         pwrdm_state_switch(pwrdm);
 132
 133         seq_printf(s, "%s (%s)", pwrdm->name,
 134                 pwrdm_state_names[pwrdm->state]);
 135
 136         for (i = 0; i < 4; i++)
 137                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 138                         pwrdm->state_timer[i]);
 139
 140         seq_putc(s, '\n');
 141         return 0;
 142 }
 143
 144 static int pm_dbg_show_counters(struct seq_file *s, void *unused)
 145 {
 146         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 147         clkdm_for_each(clkdm_dbg_show_counter, s);
 148
 149         return 0;
 150 }
 151
 152 static int pm_dbg_show_timers(struct seq_file *s, void *unused)
 153 {
 154         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 155         return 0;
 156 }
 157
 158 static int pm_dbg_open(struct inode *inode, struct file *file)
 159 {
 160         switch ((int)inode->i_private) {
 161         case DEBUG_FILE_COUNTERS:
 162                 return single_open(file, pm_dbg_show_counters,
 163                         &inode->i_private);
 164         case DEBUG_FILE_TIMERS:
 165         default:
 166                 return single_open(file, pm_dbg_show_timers,
 167                         &inode->i_private);
 168         }
 169 }
 170
 171 static const struct file_operations debug_fops = {
 172         .open           = pm_dbg_open,
 173         .read           = seq_read,
 174         .llseek         = seq_lseek,
 175         .release        = single_release,
 176 };
 177
 178 static int pwrdm_suspend_get(void *data, u64 *val)
 179 {
 180         int ret = -EINVAL;
 181
 182         if (cpu_is_omap34xx())
 183                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 184         *val = ret;
 185
 186         if (ret >= 0)
 187                 return 0;
 188         return *val;
 189 }
 190
 191 static int pwrdm_suspend_set(void *data, u64 val)
 192 {
 193         if (cpu_is_omap34xx())
 194                 return omap3_pm_set_suspend_state(
 195                         (struct powerdomain *)data, (int)val);
 196         return -EINVAL;
 197 }
 198
 199 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 200                         pwrdm_suspend_set, "%llu\n");
 201
 202 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 203 {
 204         int i;
 205         s64 t;
 206         struct dentry *d;
 207
 208         t = sched_clock();
 209
 210         for (i = 0; i < 4; i++)
 211                 pwrdm->state_timer[i] = 0;
 212
 213         pwrdm->timer = t;
 214
 215         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 216                 return 0;
 217
 218         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 219         if (d)
 220                 (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
 221                         (void *)pwrdm, &pwrdm_suspend_fops);
 222
 223         return 0;
 224 }
 225
 226 static int option_get(void *data, u64 *val)
 227 {
 228         u32 *option = data;
 229
 230         *val = *option;
 231
 232         return 0;
 233 }
 234
 235 static int option_set(void *data, u64 val)
 236 {
 237         u32 *option = data;
 238
 239         *option = val;
 240
 241         if (option == &enable_off_mode) {
 242                 if (val)
 243                         omap_pm_enable_off_mode();
 244                 else
 245                         omap_pm_disable_off_mode();
 246                 if (cpu_is_omap34xx())
 247                         omap3_pm_off_mode_enable(val);
 248         }
 249
 250         return 0;
 251 }
 252
 253 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 254
 255 static int __init pm_dbg_init(void)
 256 {
 257         struct dentry *d;
 258
 259         if (pm_dbg_init_done)
 260                 return 0;
 261
 262         d = debugfs_create_dir("pm_debug", NULL);
 263         if (!d)
 264                 return -EINVAL;
 265
 266         (void) debugfs_create_file("count", S_IRUGO,
 267                 d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
 268         (void) debugfs_create_file("time", S_IRUGO,
 269                 d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
 270
 271         pwrdm_for_each(pwrdms_setup, (void *)d);
 272
 273         (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 274                                    &enable_off_mode, &pm_dbg_option_fops);
 275         pm_dbg_init_done = 1;
 276
 277         return 0;
 278 }
 279 omap_arch_initcall(pm_dbg_init);
 280
 281 #endif