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 <r-woodruff2@ti.com>
  10  * Tony Lindgren
  11  * Juha Yrjola
  12  * Amit Kucheria <amit.kucheria@nokia.com>
  13  * Igor Stoppa <igor.stoppa@nokia.com>
  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 #ifdef CONFIG_DEBUG_FS
  38 #include <linux/debugfs.h>
  39 #include <linux/seq_file.h>
  40
  41 static int pm_dbg_init_done;
  42
  43 static int pm_dbg_init(void);
  44
  45 static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
  46         "OFF",
  47         "RET",
  48         "INA",
  49         "ON"
  50 };
  51
  52 void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
  53 {
  54         s64 t;
  55
  56         if (!pm_dbg_init_done)
  57                 return ;
  58
  59         /* Update timer for previous state */
  60         t = sched_clock();
  61
  62         pwrdm->state_timer[prev] += t - pwrdm->timer;
  63
  64         pwrdm->timer = t;
  65 }
  66
  67 static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
  68 {
  69         struct seq_file *s = (struct seq_file *)user;
  70
  71         if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
  72                 strcmp(clkdm->name, "wkup_clkdm") == 0 ||
  73                 strncmp(clkdm->name, "dpll", 4) == 0)
  74                 return 0;
  75
  76         seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm->pwrdm.ptr->name,
  77                    clkdm->usecount);
  78
  79         return 0;
  80 }
  81
  82 static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
  83 {
  84         struct seq_file *s = (struct seq_file *)user;
  85         int i;
  86
  87         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
  88                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
  89                 strncmp(pwrdm->name, "dpll", 4) == 0)
  90                 return 0;
  91
  92         if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
  93                 printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
  94                         pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
  95
  96         seq_printf(s, "%s (%s)", pwrdm->name,
  97                         pwrdm_state_names[pwrdm->state]);
  98         for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
  99                 seq_printf(s, ",%s:%d", pwrdm_state_names[i],
 100                         pwrdm->state_counter[i]);
 101
 102         seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
 103         for (i = 0; i < pwrdm->banks; i++)
 104                 seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
 105                                 pwrdm->ret_mem_off_counter[i]);
 106
 107         seq_putc(s, '\n');
 108         return 0;
 109 }
 110
 111 static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
 112 {
 113         struct seq_file *s = (struct seq_file *)user;
 114         int i;
 115
 116         if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
 117                 strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
 118                 strncmp(pwrdm->name, "dpll", 4) == 0)
 119                 return 0;
 120
 121         pwrdm_state_switch(pwrdm);
 122
 123         seq_printf(s, "%s (%s)", pwrdm->name,
 124                 pwrdm_state_names[pwrdm->state]);
 125
 126         for (i = 0; i < 4; i++)
 127                 seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
 128                         pwrdm->state_timer[i]);
 129
 130         seq_putc(s, '\n');
 131         return 0;
 132 }
 133
 134 static int pm_dbg_counters_show(struct seq_file *s, void *unused)
 135 {
 136         pwrdm_for_each(pwrdm_dbg_show_counter, s);
 137         clkdm_for_each(clkdm_dbg_show_counter, s);
 138
 139         return 0;
 140 }
 141 DEFINE_SHOW_ATTRIBUTE(pm_dbg_counters);
 142
 143 static int pm_dbg_timers_show(struct seq_file *s, void *unused)
 144 {
 145         pwrdm_for_each(pwrdm_dbg_show_timer, s);
 146         return 0;
 147 }
 148 DEFINE_SHOW_ATTRIBUTE(pm_dbg_timers);
 149
 150 static int pwrdm_suspend_get(void *data, u64 *val)
 151 {
 152         int ret = -EINVAL;
 153
 154         if (cpu_is_omap34xx())
 155                 ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
 156         *val = ret;
 157
 158         if (ret >= 0)
 159                 return 0;
 160         return *val;
 161 }
 162
 163 static int pwrdm_suspend_set(void *data, u64 val)
 164 {
 165         if (cpu_is_omap34xx())
 166                 return omap3_pm_set_suspend_state(
 167                         (struct powerdomain *)data, (int)val);
 168         return -EINVAL;
 169 }
 170
 171 DEFINE_DEBUGFS_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
 172                           pwrdm_suspend_set, "%llu\n");
 173
 174 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
 175 {
 176         int i;
 177         s64 t;
 178         struct dentry *d;
 179
 180         t = sched_clock();
 181
 182         for (i = 0; i < 4; i++)
 183                 pwrdm->state_timer[i] = 0;
 184
 185         pwrdm->timer = t;
 186
 187         if (strncmp(pwrdm->name, "dpll", 4) == 0)
 188                 return 0;
 189
 190         d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
 191         debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d, pwrdm,
 192                             &pwrdm_suspend_fops);
 193
 194         return 0;
 195 }
 196
 197 static int option_get(void *data, u64 *val)
 198 {
 199         u32 *option = data;
 200
 201         *val = *option;
 202
 203         return 0;
 204 }
 205
 206 static int option_set(void *data, u64 val)
 207 {
 208         u32 *option = data;
 209
 210         *option = val;
 211
 212         if (option == &enable_off_mode) {
 213                 if (cpu_is_omap34xx())
 214                         omap3_pm_off_mode_enable(val);
 215         }
 216
 217         return 0;
 218 }
 219
 220 DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
 221
 222 static int __init pm_dbg_init(void)
 223 {
 224         struct dentry *d;
 225
 226         if (pm_dbg_init_done)
 227                 return 0;
 228
 229         d = debugfs_create_dir("pm_debug", NULL);
 230
 231         debugfs_create_file("count", 0444, d, NULL, &pm_dbg_counters_fops);
 232         debugfs_create_file("time", 0444, d, NULL, &pm_dbg_timers_fops);
 233
 234         pwrdm_for_each(pwrdms_setup, (void *)d);
 235
 236         debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUSR, d,
 237                             &enable_off_mode, &pm_dbg_option_fops);
 238         pm_dbg_init_done = 1;
 239
 240         return 0;
 241 }
 242 omap_arch_initcall(pm_dbg_init);
 243
 244 #endif