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
pm_dbg_update_time(struct powerdomain * pwrdm,int prev)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
clkdm_dbg_show_counter(struct clockdomain * clkdm,void * user)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
pwrdm_dbg_show_counter(struct powerdomain * pwrdm,void * user)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
pwrdm_dbg_show_timer(struct powerdomain * pwrdm,void * user)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
pm_dbg_show_counters(struct seq_file * s,void * unused)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
pm_dbg_show_timers(struct seq_file * s,void * unused)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
pm_dbg_open(struct inode * inode,struct file * file)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
pwrdm_suspend_get(void * data,u64 * val)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
pwrdm_suspend_set(void * data,u64 val)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
pwrdms_setup(struct powerdomain * pwrdm,void * dir)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 if (!(IS_ERR_OR_NULL(d)))
224 (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
225 (void *)pwrdm, &pwrdm_suspend_fops);
226
227 return 0;
228 }
229
option_get(void * data,u64 * val)230 static int option_get(void *data, u64 *val)
231 {
232 u32 *option = data;
233
234 *val = *option;
235
236 return 0;
237 }
238
option_set(void * data,u64 val)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
pm_dbg_init(void)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_OR_NULL(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
286