arch/arm/mach-omap2/pm-debug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP Power Management debug routines
   4  *
   5  * Copyright (C) 2005 Texas Instruments, Inc.
   6  * Copyright (C) 2006-2008 Nokia Corporation
   7  *
   8  * Written by:
   9  * Richard Woodruff <[email protected]>
  10  * Tony Lindgren
  11  * Juha Yrjola
  12  * Amit Kucheria <[email protected]>
  13  * Igor Stoppa <[email protected]>
  14  * Jouni Hogander
  15  *
  16  * Based on pm.c for omap2
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/sched/clock.h>
  22 #include <linux/clk.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27
  28 #include "clock.h"
  29 #include "powerdomain.h"
  30 #include "clockdomain.h"
  31
  32 #include "soc.h"
  33 #include "cm2xxx_3xxx.h"
  34 #include "prm2xxx_3xxx.h"
  35 #include "pm.h"
  36
  37 u32 enable_off_mode;
  38
  39 #ifdef CONFIG_DEBUG_FS
  40 #include <linux/debugfs.h>
  41 #include <linux/seq_file.h>
  42
  43 static int pm_dbg_init_done;
  44
  45 static int pm_dbg_init(void);
  46
  47 static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  48         "OFF",
  49         "RET",
  50         "INA",
  51         "ON"
  52 };
  53
  54 void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  55 {
  56         s64 t;
  57
  58         if (!pm_dbg_init_done)
  59                 return ;
  60
  61         /* Update timer for previous state */
  62         t = sched_clock();
  63
  64         pwrdm->state_timer[prev] += t - pwrdm->timer;
  65
  66         pwrdm->timer = t;
  67 }
  68
  69 static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  70 {
  71         struct seq_file *s = (struct seq_file *)user;
  72
  73         if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
  74                 strcmp(clkdm->name, "wkup_clkdm") == 0 ||
  75                 strncmp(clkdm->name, "dpll", 4) == 0)
  76                 return 0;
  77
  78         seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm->pwrdm.ptr->name,
  79                    clkdm->usecount);
  80
  81         return 0;
  82 }
  83
  84 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  85 {
  86         struct seq_file *s = (struct seq_file *)user;
  87         int i;
  88
  89         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
  90                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
  91                 strncmp(pwrdm->name, "dpll", 4) == 0)
  92                 return 0;
  93
  94         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
  95                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
  96                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
  97
  98         seq_printf(s, "%s (%s)", pwrdm->name,
  99                         pwrdm_state_names[pwrdm->state]);
 100         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
 101                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 102                         pwrdm->state_counter[i]);
 103
 104         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 105         for (i = 0; i < pwrdm->banks; i++)
 106                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 107                                 pwrdm->ret_mem_off_counter[i]);
 108
 109         seq_putc(s, '\n');
 110         return 0;
 111 }
 112
 113 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 114 {
 115         struct seq_file *s = (struct seq_file *)user;
 116         int i;
 117
 118         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 119                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 120                 strncmp(pwrdm->name, "dpll", 4) == 0)
 121                 return 0;
 122
 123         pwrdm_state_switch(pwrdm);
 124
 125         seq_printf(s, "%s (%s)", pwrdm->name,
 126                 pwrdm_state_names[pwrdm->state]);
 127
 128         for (i = 0; i < 4; i++)
 129                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 130                         pwrdm->state_timer[i]);
 131
 132         seq_putc(s, '\n');
 133         return 0;
 134 }
 135
 136 static int pm_dbg_counters_show(struct seq_file *s, void *unused)
 137 {
 138         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 139         clkdm_for_each(clkdm_dbg_show_counter, s);
 140
 141         return 0;
 142 }
 143 DEFINE_SHOW_ATTRIBUTE(pm_dbg_counters);
 144
 145 static int pm_dbg_timers_show(struct seq_file *s, void *unused)
 146 {
 147         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 148         return 0;
 149 }
 150 DEFINE_SHOW_ATTRIBUTE(pm_dbg_timers);
 151
 152 static int pwrdm_suspend_get(void *data, u64 *val)
 153 {
 154         int ret = -EINVAL;
 155
 156         if (cpu_is_omap34xx())
 157                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 158         *val = ret;
 159
 160         if (ret >= 0)
 161                 return 0;
 162         return *val;
 163 }
 164
 165 static int pwrdm_suspend_set(void *data, u64 val)
 166 {
 167         if (cpu_is_omap34xx())
 168                 return omap3_pm_set_suspend_state(
 169                         (struct powerdomain *)data, (int)val);
 170         return -EINVAL;
 171 }
 172
 173 DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 174                         pwrdm_suspend_set, "%llu\n");
 175
 176 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 177 {
 178         int i;
 179         s64 t;
 180         struct dentry *d;
 181
 182         t = sched_clock();
 183
 184         for (i = 0; i < 4; i++)
 185                 pwrdm->state_timer[i] = 0;
 186
 187         pwrdm->timer = t;
 188
 189         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 190                 return 0;
 191
 192         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 193         debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d, pwrdm,
 194                             &pwrdm_suspend_fops);
 195
 196         return 0;
 197 }
 198
 199 static int option_get(void *data, u64 *val)
 200 {
 201         u32 *option = data;
 202
 203         *val = *option;
 204
 205         return 0;
 206 }
 207
 208 static int option_set(void *data, u64 val)
 209 {
 210         u32 *option = data;
 211
 212         *option = val;
 213
 214         if (option == &enable_off_mode) {
 215                 if (cpu_is_omap34xx())
 216                         omap3_pm_off_mode_enable(val);
 217         }
 218
 219         return 0;
 220 }
 221
 222 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 223
 224 static int __init pm_dbg_init(void)
 225 {
 226         struct dentry *d;
 227
 228         if (pm_dbg_init_done)
 229                 return 0;
 230
 231         d = debugfs_create_dir("pm_debug", NULL);
 232
 233         debugfs_create_file("count", 0444, d, NULL, &pm_dbg_counters_fops);
 234         debugfs_create_file("time", 0444, d, NULL, &pm_dbg_timers_fops);
 235
 236         pwrdm_for_each(pwrdms_setup, (void *)d);
 237
 238         debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 239                             &enable_off_mode, &pm_dbg_option_fops);
 240         pm_dbg_init_done = 1;
 241
 242         return 0;
 243 }
 244 omap_arch_initcall(pm_dbg_init);
 245
 246 #endif