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/sched/clock.h>
  25 #include <linux/clk.h>
  26 #include <linux/err.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30
  31 #include "clock.h"
  32 #include "powerdomain.h"
  33 #include "clockdomain.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 static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  51         "OFF",
  52         "RET",
  53         "INA",
  54         "ON"
  55 };
  56
  57 void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  58 {
  59         s64 t;
  60
  61         if (!pm_dbg_init_done)
  62                 return ;
  63
  64         /* Update timer for previous state */
  65         t = sched_clock();
  66
  67         pwrdm->state_timer[prev] += t - pwrdm->timer;
  68
  69         pwrdm->timer = t;
  70 }
  71
  72 static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  73 {
  74         struct seq_file *s = (struct seq_file *)user;
  75
  76         if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
  77                 strcmp(clkdm->name, "wkup_clkdm") == 0 ||
  78                 strncmp(clkdm->name, "dpll", 4) == 0)
  79                 return 0;
  80
  81         seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm->pwrdm.ptr->name,
  82                    clkdm->usecount);
  83
  84         return 0;
  85 }
  86
  87 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  88 {
  89         struct seq_file *s = (struct seq_file *)user;
  90         int i;
  91
  92         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
  93                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
  94                 strncmp(pwrdm->name, "dpll", 4) == 0)
  95                 return 0;
  96
  97         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
  98                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
  99                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
 100
 101         seq_printf(s, "%s (%s)", pwrdm->name,
 102                         pwrdm_state_names[pwrdm->state]);
 103         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 104                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 105                         pwrdm->state_counter[i]);
 106
 107         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 108         for (i = 0; i < pwrdm->banks; i++)
 109                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 110                                 pwrdm->ret_mem_off_counter[i]);
 111
 112         seq_putc(s, '\n');
 113         return 0;
 114 }
 115
 116 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 117 {
 118         struct seq_file *s = (struct seq_file *)user;
 119         int i;
 120
 121         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 122                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 123                 strncmp(pwrdm->name, "dpll", 4) == 0)
 124                 return 0;
 125
 126         pwrdm_state_switch(pwrdm);
 127
 128         seq_printf(s, "%s (%s)", pwrdm->name,
 129                 pwrdm_state_names[pwrdm->state]);
 130
 131         for (i = 0; i < 4; i++)
 132                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 133                         pwrdm->state_timer[i]);
 134
 135         seq_putc(s, '\n');
 136         return 0;
 137 }
 138
 139 static int pm_dbg_counters_show(struct seq_file *s, void *unused)
 140 {
 141         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 142         clkdm_for_each(clkdm_dbg_show_counter, s);
 143
 144         return 0;
 145 }
 146 DEFINE_SHOW_ATTRIBUTE(pm_dbg_counters);
 147
 148 static int pm_dbg_timers_show(struct seq_file *s, void *unused)
 149 {
 150         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 151         return 0;
 152 }
 153 DEFINE_SHOW_ATTRIBUTE(pm_dbg_timers);
 154
 155 static int pwrdm_suspend_get(void *data, u64 *val)
 156 {
 157         int ret = -EINVAL;
 158
 159         if (cpu_is_omap34xx())
 160                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 161         *val = ret;
 162
 163         if (ret >= 0)
 164                 return 0;
 165         return *val;
 166 }
 167
 168 static int pwrdm_suspend_set(void *data, u64 val)
 169 {
 170         if (cpu_is_omap34xx())
 171                 return omap3_pm_set_suspend_state(
 172                         (struct powerdomain *)data, (int)val);
 173         return -EINVAL;
 174 }
 175
 176 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 177                         pwrdm_suspend_set, "%llu\n");
 178
 179 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 180 {
 181         int i;
 182         s64 t;
 183         struct dentry *d;
 184
 185         t = sched_clock();
 186
 187         for (i = 0; i < 4; i++)
 188                 pwrdm->state_timer[i] = 0;
 189
 190         pwrdm->timer = t;
 191
 192         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 193                 return 0;
 194
 195         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 196         if (d)
 197                 (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
 198                         (void *)pwrdm, &pwrdm_suspend_fops);
 199
 200         return 0;
 201 }
 202
 203 static int option_get(void *data, u64 *val)
 204 {
 205         u32 *option = data;
 206
 207         *val = *option;
 208
 209         return 0;
 210 }
 211
 212 static int option_set(void *data, u64 val)
 213 {
 214         u32 *option = data;
 215
 216         *option = val;
 217
 218         if (option == &enable_off_mode) {
 219                 if (cpu_is_omap34xx())
 220                         omap3_pm_off_mode_enable(val);
 221         }
 222
 223         return 0;
 224 }
 225
 226 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 227
 228 static int __init pm_dbg_init(void)
 229 {
 230         struct dentry *d;
 231
 232         if (pm_dbg_init_done)
 233                 return 0;
 234
 235         d = debugfs_create_dir("pm_debug", NULL);
 236         if (!d)
 237                 return -EINVAL;
 238
 239         (void) debugfs_create_file("count", 0444, d, NULL, &pm_dbg_counters_fops);
 240         (void) debugfs_create_file("time", 0444, d, NULL, &pm_dbg_timers_fops);
 241
 242         pwrdm_for_each(pwrdms_setup, (void *)d);
 243
 244         (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 245                                    &enable_off_mode, &pm_dbg_option_fops);
 246         pm_dbg_init_done = 1;
 247
 248         return 0;
 249 }
 250 omap_arch_initcall(pm_dbg_init);
 251
 252 #endif