summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/pm-debug.c
blob: a8afb610c7d83fa7a500445ea4647d4935d26e09 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
/*
 * OMAP Power Management debug routines
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * Written by:
 * Richard Woodruff <r-woodruff2@ti.com>
 * Tony Lindgren
 * Juha Yrjola
 * Amit Kucheria <amit.kucheria@nokia.com>
 * Igor Stoppa <igor.stoppa@nokia.com>
 * Jouni Hogander
 *
 * Based on pm.c for omap2
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <plat/clock.h>
#include <plat/board.h>
#include <plat/powerdomain.h>
#include <plat/clockdomain.h>
#include <plat/dmtimer.h>

#include "prm.h"
#include "cm.h"
#include "pm.h"

int omap2_pm_debug;
u32 enable_off_mode;
u32 sleep_while_idle;
u32 wakeup_timer_seconds;
u32 wakeup_timer_milliseconds;

#define DUMP_PRM_MOD_REG(mod, reg)    \
	regs[reg_count].name = #mod "." #reg; \
	regs[reg_count++].val = prm_read_mod_reg(mod, reg)
#define DUMP_CM_MOD_REG(mod, reg)     \
	regs[reg_count].name = #mod "." #reg; \
	regs[reg_count++].val = cm_read_mod_reg(mod, reg)
#define DUMP_PRM_REG(reg) \
	regs[reg_count].name = #reg; \
	regs[reg_count++].val = __raw_readl(reg)
#define DUMP_CM_REG(reg) \
	regs[reg_count].name = #reg; \
	regs[reg_count++].val = __raw_readl(reg)
#define DUMP_INTC_REG(reg, off) \
	regs[reg_count].name = #reg; \
	regs[reg_count++].val = \
			 __raw_readl(OMAP2_L4_IO_ADDRESS(0x480fe000 + (off)))

void omap2_pm_dump(int mode, int resume, unsigned int us)
{
	struct reg {
		const char *name;
		u32 val;
	} regs[32];
	int reg_count = 0, i;
	const char *s1 = NULL, *s2 = NULL;

	if (!resume) {
#if 0
		/* MPU */
		DUMP_PRM_MOD_REG(OCP_MOD, OMAP2_PRM_IRQENABLE_MPU_OFFSET);
		DUMP_CM_MOD_REG(MPU_MOD, OMAP2_CM_CLKSTCTRL);
		DUMP_PRM_MOD_REG(MPU_MOD, OMAP2_PM_PWSTCTRL);
		DUMP_PRM_MOD_REG(MPU_MOD, OMAP2_PM_PWSTST);
		DUMP_PRM_MOD_REG(MPU_MOD, PM_WKDEP);
#endif
#if 0
		/* INTC */
		DUMP_INTC_REG(INTC_MIR0, 0x0084);
		DUMP_INTC_REG(INTC_MIR1, 0x00a4);
		DUMP_INTC_REG(INTC_MIR2, 0x00c4);
#endif
#if 0
		DUMP_CM_MOD_REG(CORE_MOD, CM_FCLKEN1);
		if (cpu_is_omap24xx()) {
			DUMP_CM_MOD_REG(CORE_MOD, OMAP24XX_CM_FCLKEN2);
			DUMP_PRM_MOD_REG(OMAP24XX_GR_MOD,
					OMAP2_PRCM_CLKEMUL_CTRL_OFFSET);
			DUMP_PRM_MOD_REG(OMAP24XX_GR_MOD,
					OMAP2_PRCM_CLKSRC_CTRL_OFFSET);
		}
		DUMP_CM_MOD_REG(WKUP_MOD, CM_FCLKEN);
		DUMP_CM_MOD_REG(CORE_MOD, CM_ICLKEN1);
		DUMP_CM_MOD_REG(CORE_MOD, CM_ICLKEN2);
		DUMP_CM_MOD_REG(WKUP_MOD, CM_ICLKEN);
		DUMP_CM_MOD_REG(PLL_MOD, CM_CLKEN);
		DUMP_CM_MOD_REG(PLL_MOD, CM_AUTOIDLE);
		DUMP_PRM_MOD_REG(CORE_MOD, OMAP2_PM_PWSTST);
#endif
#if 0
		/* DSP */
		if (cpu_is_omap24xx()) {
			DUMP_CM_MOD_REG(OMAP24XX_DSP_MOD, CM_FCLKEN);
			DUMP_CM_MOD_REG(OMAP24XX_DSP_MOD, CM_ICLKEN);
			DUMP_CM_MOD_REG(OMAP24XX_DSP_MOD, CM_IDLEST);
			DUMP_CM_MOD_REG(OMAP24XX_DSP_MOD, CM_AUTOIDLE);
			DUMP_CM_MOD_REG(OMAP24XX_DSP_MOD, CM_CLKSEL);
			DUMP_CM_MOD_REG(OMAP24XX_DSP_MOD, OMAP2_CM_CLKSTCTRL);
			DUMP_PRM_MOD_REG(OMAP24XX_DSP_MOD, OMAP2_RM_RSTCTRL);
			DUMP_PRM_MOD_REG(OMAP24XX_DSP_MOD, OMAP2_RM_RSTST);
			DUMP_PRM_MOD_REG(OMAP24XX_DSP_MOD, OMAP2_PM_PWSTCTRL);
			DUMP_PRM_MOD_REG(OMAP24XX_DSP_MOD, OMAP2_PM_PWSTST);
		}
#endif
	} else {
		DUMP_PRM_MOD_REG(CORE_MOD, PM_WKST1);
		if (cpu_is_omap24xx())
			DUMP_PRM_MOD_REG(CORE_MOD, OMAP24XX_PM_WKST2);
		DUMP_PRM_MOD_REG(WKUP_MOD, PM_WKST);
		DUMP_PRM_MOD_REG(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
#if 1
		DUMP_INTC_REG(INTC_PENDING_IRQ0, 0x0098);
		DUMP_INTC_REG(INTC_PENDING_IRQ1, 0x00b8);
		DUMP_INTC_REG(INTC_PENDING_IRQ2, 0x00d8);
#endif
	}

	switch (mode) {
	case 0:
		s1 = "full";
		s2 = "retention";
		break;
	case 1:
		s1 = "MPU";
		s2 = "retention";
		break;
	case 2:
		s1 = "MPU";
		s2 = "idle";
		break;
	}

	if (!resume)
#ifdef CONFIG_NO_HZ
		printk(KERN_INFO
		       "--- Going to %s %s (next timer after %u ms)\n", s1, s2,
		       jiffies_to_msecs(get_next_timer_interrupt(jiffies) -
					jiffies));
#else
		printk(KERN_INFO "--- Going to %s %s\n", s1, s2);
#endif
	else
		printk(KERN_INFO "--- Woke up (slept for %u.%03u ms)\n",
			us / 1000, us % 1000);

	for (i = 0; i < reg_count; i++)
		printk(KERN_INFO "%-20s: 0x%08x\n", regs[i].name, regs[i].val);
}

void omap2_pm_wakeup_on_timer(u32 seconds, u32 milliseconds)
{
	u32 tick_rate, cycles;

	if (!seconds && !milliseconds)
		return;

	tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
	cycles = tick_rate * seconds + tick_rate * milliseconds / 1000;
	omap_dm_timer_stop(gptimer_wakeup);
	omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);

	pr_info("PM: Resume timer in %u.%03u secs"
		" (%d ticks at %d ticks/sec.)\n",
		seconds, milliseconds, cycles, tick_rate);
}

#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>

static void pm_dbg_regset_store(u32 *ptr);

static struct dentry *pm_dbg_dir;

static int pm_dbg_init_done;

static int __init pm_dbg_init(void);

enum {
	DEBUG_FILE_COUNTERS = 0,
	DEBUG_FILE_TIMERS,
};

struct pm_module_def {
	char name[8]; /* Name of the module */
	short type; /* CM or PRM */
	unsigned short offset;
	int low; /* First register address on this module */
	int high; /* Last register address on this module */
};

#define MOD_CM 0
#define MOD_PRM 1

static const struct pm_module_def *pm_dbg_reg_modules;
static const struct pm_module_def omap3_pm_reg_modules[] = {
	{ "IVA2", MOD_CM, OMAP3430_IVA2_MOD, 0, 0x4c },
	{ "OCP", MOD_CM, OCP_MOD, 0, 0x10 },
	{ "MPU", MOD_CM, MPU_MOD, 4, 0x4c },
	{ "CORE", MOD_CM, CORE_MOD, 0, 0x4c },
	{ "SGX", MOD_CM, OMAP3430ES2_SGX_MOD, 0, 0x4c },
	{ "WKUP", MOD_CM, WKUP_MOD, 0, 0x40 },
	{ "CCR", MOD_CM, PLL_MOD, 0, 0x70 },
	{ "DSS", MOD_CM, OMAP3430_DSS_MOD, 0, 0x4c },
	{ "CAM", MOD_CM, OMAP3430_CAM_MOD, 0, 0x4c },
	{ "PER", MOD_CM, OMAP3430_PER_MOD, 0, 0x4c },
	{ "EMU", MOD_CM, OMAP3430_EMU_MOD, 0x40, 0x54 },
	{ "NEON", MOD_CM, OMAP3430_NEON_MOD, 0x20, 0x48 },
	{ "USB", MOD_CM, OMAP3430ES2_USBHOST_MOD, 0, 0x4c },

	{ "IVA2", MOD_PRM, OMAP3430_IVA2_MOD, 0x50, 0xfc },
	{ "OCP", MOD_PRM, OCP_MOD, 4, 0x1c },
	{ "MPU", MOD_PRM, MPU_MOD, 0x58, 0xe8 },
	{ "CORE", MOD_PRM, CORE_MOD, 0x58, 0xf8 },
	{ "SGX", MOD_PRM, OMAP3430ES2_SGX_MOD, 0x58, 0xe8 },
	{ "WKUP", MOD_PRM, WKUP_MOD, 0xa0, 0xb0 },
	{ "CCR", MOD_PRM, PLL_MOD, 0x40, 0x70 },
	{ "DSS", MOD_PRM, OMAP3430_DSS_MOD, 0x58, 0xe8 },
	{ "CAM", MOD_PRM, OMAP3430_CAM_MOD, 0x58, 0xe8 },
	{ "PER", MOD_PRM, OMAP3430_PER_MOD, 0x58, 0xe8 },
	{ "EMU", MOD_PRM, OMAP3430_EMU_MOD, 0x58, 0xe4 },
	{ "GLBL", MOD_PRM, OMAP3430_GR_MOD, 0x20, 0xe4 },
	{ "NEON", MOD_PRM, OMAP3430_NEON_MOD, 0x58, 0xe8 },
	{ "USB", MOD_PRM, OMAP3430ES2_USBHOST_MOD, 0x58, 0xe8 },
	{ "", 0, 0, 0, 0 },
};

#define PM_DBG_MAX_REG_SETS 4

static void *pm_dbg_reg_set[PM_DBG_MAX_REG_SETS];

static int pm_dbg_get_regset_size(void)
{
	static int regset_size;

	if (regset_size == 0) {
		int i = 0;

		while (pm_dbg_reg_modules[i].name[0] != 0) {
			regset_size += pm_dbg_reg_modules[i].high +
				4 - pm_dbg_reg_modules[i].low;
			i++;
		}
	}
	return regset_size;
}

static int pm_dbg_show_regs(struct seq_file *s, void *unused)
{
	int i, j;
	unsigned long val;
	int reg_set = (int)s->private;
	u32 *ptr;
	void *store = NULL;
	int regs;
	int linefeed;

	if (reg_set == 0) {
		store = kmalloc(pm_dbg_get_regset_size(), GFP_KERNEL);
		ptr = store;
		pm_dbg_regset_store(ptr);
	} else {
		ptr = pm_dbg_reg_set[reg_set - 1];
	}

	i = 0;

	while (pm_dbg_reg_modules[i].name[0] != 0) {
		regs = 0;
		linefeed = 0;
		if (pm_dbg_reg_modules[i].type == MOD_CM)
			seq_printf(s, "MOD: CM_%s (%08x)\n",
				pm_dbg_reg_modules[i].name,
				(u32)(OMAP3430_CM_BASE +
				pm_dbg_reg_modules[i].offset));
		else
			seq_printf(s, "MOD: PRM_%s (%08x)\n",
				pm_dbg_reg_modules[i].name,
				(u32)(OMAP3430_PRM_BASE +
				pm_dbg_reg_modules[i].offset));

		for (j = pm_dbg_reg_modules[i].low;
			j <= pm_dbg_reg_modules[i].high; j += 4) {
			val = *(ptr++);
			if (val != 0) {
				regs++;
				if (linefeed) {
					seq_printf(s, "\n");
					linefeed = 0;
				}
				seq_printf(s, "  %02x => %08lx", j, val);
				if (regs % 4 == 0)
					linefeed = 1;
			}
		}
		seq_printf(s, "\n");
		i++;
	}

	if (store != NULL)
		kfree(store);

	return 0;
}

static void pm_dbg_regset_store(u32 *ptr)
{
	int i, j;
	u32 val;

	i = 0;

	while (pm_dbg_reg_modules[i].name[0] != 0) {
		for (j = pm_dbg_reg_modules[i].low;
			j <= pm_dbg_reg_modules[i].high; j += 4) {
			if (pm_dbg_reg_modules[i].type == MOD_CM)
				val = cm_read_mod_reg(
					pm_dbg_reg_modules[i].offset, j);
			else
				val = prm_read_mod_reg(
					pm_dbg_reg_modules[i].offset, j);
			*(ptr++) = val;
		}
		i++;
	}
}

int pm_dbg_regset_save(int reg_set)
{
	if (pm_dbg_reg_set[reg_set-1] == NULL)
		return -EINVAL;

	pm_dbg_regset_store(pm_dbg_reg_set[reg_set-1]);

	return 0;
}

static const char pwrdm_state_names[][PWRDM_MAX_PWRSTS] = {
	"OFF",
	"RET",
	"INA",
	"ON"
};

void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
{
	s64 t;

	if (!pm_dbg_init_done)
		return ;

	/* Update timer for previous state */
	t = sched_clock();

	pwrdm->state_timer[prev] += t - pwrdm->timer;

	pwrdm->timer = t;
}

static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
{
	struct seq_file *s = (struct seq_file *)user;

	if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
		strcmp(clkdm->name, "wkup_clkdm") == 0 ||
		strncmp(clkdm->name, "dpll", 4) == 0)
		return 0;

	seq_printf(s, "%s->%s (%d)", clkdm->name,
			clkdm->pwrdm.ptr->name,
			atomic_read(&clkdm->usecount));
	seq_printf(s, "\n");

	return 0;
}

static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
{
	struct seq_file *s = (struct seq_file *)user;
	int i;

	if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
		strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
		strncmp(pwrdm->name, "dpll", 4) == 0)
		return 0;

	if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
		printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
			pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));

	seq_printf(s, "%s (%s)", pwrdm->name,
			pwrdm_state_names[pwrdm->state]);
	for (i = 0; i < PWRDM_MAX_PWRSTS; i++)
		seq_printf(s, ",%s:%d", pwrdm_state_names[i],
			pwrdm->state_counter[i]);

	seq_printf(s, ",RET-LOGIC-OFF:%d", pwrdm->ret_logic_off_counter);
	for (i = 0; i < pwrdm->banks; i++)
		seq_printf(s, ",RET-MEMBANK%d-OFF:%d", i + 1,
				pwrdm->ret_mem_off_counter[i]);

	seq_printf(s, "\n");

	return 0;
}

static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
{
	struct seq_file *s = (struct seq_file *)user;
	int i;

	if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
		strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
		strncmp(pwrdm->name, "dpll", 4) == 0)
		return 0;

	pwrdm_state_switch(pwrdm);

	seq_printf(s, "%s (%s)", pwrdm->name,
		pwrdm_state_names[pwrdm->state]);

	for (i = 0; i < 4; i++)
		seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
			pwrdm->state_timer[i]);

	seq_printf(s, "\n");
	return 0;
}

static int pm_dbg_show_counters(struct seq_file *s, void *unused)
{
	pwrdm_for_each(pwrdm_dbg_show_counter, s);
	clkdm_for_each(clkdm_dbg_show_counter, s);

	return 0;
}

static int pm_dbg_show_timers(struct seq_file *s, void *unused)
{
	pwrdm_for_each(pwrdm_dbg_show_timer, s);
	return 0;
}

static int pm_dbg_open(struct inode *inode, struct file *file)
{
	switch ((int)inode->i_private) {
	case DEBUG_FILE_COUNTERS:
		return single_open(file, pm_dbg_show_counters,
			&inode->i_private);
	case DEBUG_FILE_TIMERS:
	default:
		return single_open(file, pm_dbg_show_timers,
			&inode->i_private);
	};
}

static int pm_dbg_reg_open(struct inode *inode, struct file *file)
{
	return single_open(file, pm_dbg_show_regs, inode->i_private);
}

static const struct file_operations debug_fops = {
	.open           = pm_dbg_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

static const struct file_operations debug_reg_fops = {
	.open           = pm_dbg_reg_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

int pm_dbg_regset_init(int reg_set)
{
	char name[2];

	if (!pm_dbg_init_done)
		pm_dbg_init();

	if (reg_set < 1 || reg_set > PM_DBG_MAX_REG_SETS ||
		pm_dbg_reg_set[reg_set-1] != NULL)
		return -EINVAL;

	pm_dbg_reg_set[reg_set-1] =
		kmalloc(pm_dbg_get_regset_size(), GFP_KERNEL);

	if (pm_dbg_reg_set[reg_set-1] == NULL)
		return -ENOMEM;

	if (pm_dbg_dir != NULL) {
		sprintf(name, "%d", reg_set);

		(void) debugfs_create_file(name, S_IRUGO,
			pm_dbg_dir, (void *)reg_set, &debug_reg_fops);
	}

	return 0;
}

static int pwrdm_suspend_get(void *data, u64 *val)
{
	int ret = -EINVAL;

	if (cpu_is_omap34xx())
		ret = omap3_pm_get_suspend_state((struct powerdomain *)data);
	*val = ret;

	if (ret >= 0)
		return 0;
	return *val;
}

static int pwrdm_suspend_set(void *data, u64 val)
{
	if (cpu_is_omap34xx())
		return omap3_pm_set_suspend_state(
			(struct powerdomain *)data, (int)val);
	return -EINVAL;
}

DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
			pwrdm_suspend_set, "%llu\n");

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
{
	int i;
	s64 t;
	struct dentry *d;

	t = sched_clock();

	for (i = 0; i < 4; i++)
		pwrdm->state_timer[i] = 0;

	pwrdm->timer = t;

	if (strncmp(pwrdm->name, "dpll", 4) == 0)
		return 0;

	d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);

	(void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
			(void *)pwrdm, &pwrdm_suspend_fops);

	return 0;
}

static int option_get(void *data, u64 *val)
{
	u32 *option = data;

	*val = *option;

	return 0;
}

static int option_set(void *data, u64 val)
{
	u32 *option = data;

	if (option == &wakeup_timer_milliseconds && val >= 1000)
		return -EINVAL;

	*option = val;

	if (option == &enable_off_mode) {
		if (cpu_is_omap34xx())
			omap3_pm_off_mode_enable(val);
	}

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");

static int __init pm_dbg_init(void)
{
	int i;
	struct dentry *d;
	char name[2];

	if (pm_dbg_init_done)
		return 0;

	if (cpu_is_omap34xx())
		pm_dbg_reg_modules = omap3_pm_reg_modules;
	else {
		printk(KERN_ERR "%s: only OMAP3 supported\n", __func__);
		return -ENODEV;
	}

	d = debugfs_create_dir("pm_debug", NULL);
	if (IS_ERR(d))
		return PTR_ERR(d);

	(void) debugfs_create_file("count", S_IRUGO,
		d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
	(void) debugfs_create_file("time", S_IRUGO,
		d, (void *)DEBUG_FILE_TIMERS, &debug_fops);

	pwrdm_for_each(pwrdms_setup, (void *)d);

	pm_dbg_dir = debugfs_create_dir("registers", d);
	if (IS_ERR(pm_dbg_dir))
		return PTR_ERR(pm_dbg_dir);

	(void) debugfs_create_file("current", S_IRUGO,
		pm_dbg_dir, (void *)0, &debug_reg_fops);

	for (i = 0; i < PM_DBG_MAX_REG_SETS; i++)
		if (pm_dbg_reg_set[i] != NULL) {
			sprintf(name, "%d", i+1);
			(void) debugfs_create_file(name, S_IRUGO,
				pm_dbg_dir, (void *)(i+1), &debug_reg_fops);

		}

	(void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUGO, d,
				   &enable_off_mode, &pm_dbg_option_fops);
	(void) debugfs_create_file("sleep_while_idle", S_IRUGO | S_IWUGO, d,
				   &sleep_while_idle, &pm_dbg_option_fops);
	(void) debugfs_create_file("wakeup_timer_seconds", S_IRUGO | S_IWUGO, d,
				   &wakeup_timer_seconds, &pm_dbg_option_fops);
	(void) debugfs_create_file("wakeup_timer_milliseconds",
			S_IRUGO | S_IWUGO, d, &wakeup_timer_milliseconds,
			&pm_dbg_option_fops);
	pm_dbg_init_done = 1;

	return 0;
}
arch_initcall(pm_dbg_init);

#endif