summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/pm34xx.c
blob: 2dbd3785ee6f0d00b4c3d88bada28d83c0203b2a (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
/*
 * OMAP3 Power Management Routines
 *
 * Copyright (C) 2006-2008 Nokia Corporation
 * Tony Lindgren <tony@atomide.com>
 * Jouni Hogander
 *
 * Copyright (C) 2007 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Richard Woodruff <r-woodruff2@ti.com>
 *
 * Based on pm.c for omap1
 *
 * 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/pm.h>
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/omap-dma.h>
#include <linux/omap-gpmc.h>
#include <linux/platform_data/gpio-omap.h>

#include <trace/events/power.h>

#include <asm/fncpy.h>
#include <asm/suspend.h>
#include <asm/system_misc.h>

#include "clockdomain.h"
#include "powerdomain.h"
#include "soc.h"
#include "common.h"
#include "cm3xxx.h"
#include "cm-regbits-34xx.h"
#include "prm-regbits-34xx.h"
#include "prm3xxx.h"
#include "pm.h"
#include "sdrc.h"
#include "sram.h"
#include "control.h"
#include "vc.h"

/* pm34xx errata defined in pm.h */
u16 pm34xx_errata;

struct power_state {
	struct powerdomain *pwrdm;
	u32 next_state;
#ifdef CONFIG_SUSPEND
	u32 saved_state;
#endif
	struct list_head node;
};

static LIST_HEAD(pwrst_list);

static int (*_omap_save_secure_sram)(u32 *addr);
void (*omap3_do_wfi_sram)(void);

static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;

static void omap3_core_save_context(void)
{
	omap3_ctrl_save_padconf();

	/*
	 * Force write last pad into memory, as this can fail in some
	 * cases according to errata 1.157, 1.185
	 */
	omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
		OMAP343X_CONTROL_MEM_WKUP + 0x2a0);

	/* Save the Interrupt controller context */
	omap_intc_save_context();
	/* Save the GPMC context */
	omap3_gpmc_save_context();
	/* Save the system control module context, padconf already save above*/
	omap3_control_save_context();
	omap_dma_global_context_save();
}

static void omap3_core_restore_context(void)
{
	/* Restore the control module context, padconf restored by h/w */
	omap3_control_restore_context();
	/* Restore the GPMC context */
	omap3_gpmc_restore_context();
	/* Restore the interrupt controller context */
	omap_intc_restore_context();
	omap_dma_global_context_restore();
}

/*
 * FIXME: This function should be called before entering off-mode after
 * OMAP3 secure services have been accessed. Currently it is only called
 * once during boot sequence, but this works as we are not using secure
 * services.
 */
static void omap3_save_secure_ram_context(void)
{
	u32 ret;
	int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);

	if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
		/*
		 * MPU next state must be set to POWER_ON temporarily,
		 * otherwise the WFI executed inside the ROM code
		 * will hang the system.
		 */
		pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
		ret = _omap_save_secure_sram((u32 *)(unsigned long)
				__pa(omap3_secure_ram_storage));
		pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state);
		/* Following is for error tracking, it should not happen */
		if (ret) {
			pr_err("save_secure_sram() returns %08x\n", ret);
			while (1)
				;
		}
	}
}

static irqreturn_t _prcm_int_handle_io(int irq, void *unused)
{
	int c;

	c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, OMAP3430_ST_IO_MASK |
				    OMAP3430_ST_IO_CHAIN_MASK);

	return c ? IRQ_HANDLED : IRQ_NONE;
}

static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused)
{
	int c;

	/*
	 * Clear all except ST_IO and ST_IO_CHAIN for wkup module,
	 * these are handled in a separate handler to avoid acking
	 * IO events before parsing in mux code
	 */
	c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, ~(OMAP3430_ST_IO_MASK |
						   OMAP3430_ST_IO_CHAIN_MASK));
	c += omap_prm_clear_mod_irqs(CORE_MOD, 1, ~0);
	c += omap_prm_clear_mod_irqs(OMAP3430_PER_MOD, 1, ~0);
	if (omap_rev() > OMAP3430_REV_ES1_0) {
		c += omap_prm_clear_mod_irqs(CORE_MOD, 3, ~0);
		c += omap_prm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, ~0);
	}

	return c ? IRQ_HANDLED : IRQ_NONE;
}

static void omap34xx_save_context(u32 *save)
{
	u32 val;

	/* Read Auxiliary Control Register */
	asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val));
	*save++ = 1;
	*save++ = val;

	/* Read L2 AUX ctrl register */
	asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
	*save++ = 1;
	*save++ = val;
}

static int omap34xx_do_sram_idle(unsigned long save_state)
{
	omap34xx_cpu_suspend(save_state);
	return 0;
}

void omap_sram_idle(void)
{
	/* Variable to tell what needs to be saved and restored
	 * in omap_sram_idle*/
	/* save_state = 0 => Nothing to save and restored */
	/* save_state = 1 => Only L1 and logic lost */
	/* save_state = 2 => Only L2 lost */
	/* save_state = 3 => L1, L2 and logic lost */
	int save_state = 0;
	int mpu_next_state = PWRDM_POWER_ON;
	int per_next_state = PWRDM_POWER_ON;
	int core_next_state = PWRDM_POWER_ON;
	int per_going_off;
	int core_prev_state;
	u32 sdrc_pwr = 0;

	mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
	switch (mpu_next_state) {
	case PWRDM_POWER_ON:
	case PWRDM_POWER_RET:
		/* No need to save context */
		save_state = 0;
		break;
	case PWRDM_POWER_OFF:
		save_state = 3;
		break;
	default:
		/* Invalid state */
		pr_err("Invalid mpu state in sram_idle\n");
		return;
	}

	/* NEON control */
	if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
		pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);

	/* Enable IO-PAD and IO-CHAIN wakeups */
	per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
	core_next_state = pwrdm_read_next_pwrst(core_pwrdm);

	pwrdm_pre_transition(NULL);

	/* PER */
	if (per_next_state < PWRDM_POWER_ON) {
		per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0;
		omap2_gpio_prepare_for_idle(per_going_off);
	}

	/* CORE */
	if (core_next_state < PWRDM_POWER_ON) {
		if (core_next_state == PWRDM_POWER_OFF) {
			omap3_core_save_context();
			omap3_cm_save_context();
		}
	}

	/* Configure PMIC signaling for I2C4 or sys_off_mode */
	omap3_vc_set_pmic_signaling(core_next_state);

	omap3_intc_prepare_idle();

	/*
	 * On EMU/HS devices ROM code restores a SRDC value
	 * from scratchpad which has automatic self refresh on timeout
	 * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443.
	 * Hence store/restore the SDRC_POWER register here.
	 */
	if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
	    (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
	     omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
	    core_next_state == PWRDM_POWER_OFF)
		sdrc_pwr = sdrc_read_reg(SDRC_POWER);

	/*
	 * omap3_arm_context is the location where some ARM context
	 * get saved. The rest is placed on the stack, and restored
	 * from there before resuming.
	 */
	if (save_state)
		omap34xx_save_context(omap3_arm_context);
	if (save_state == 1 || save_state == 3)
		cpu_suspend(save_state, omap34xx_do_sram_idle);
	else
		omap34xx_do_sram_idle(save_state);

	/* Restore normal SDRC POWER settings */
	if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
	    (omap_type() == OMAP2_DEVICE_TYPE_EMU ||
	     omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
	    core_next_state == PWRDM_POWER_OFF)
		sdrc_write_reg(sdrc_pwr, SDRC_POWER);

	/* CORE */
	if (core_next_state < PWRDM_POWER_ON) {
		core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
		if (core_prev_state == PWRDM_POWER_OFF) {
			omap3_core_restore_context();
			omap3_cm_restore_context();
			omap3_sram_restore_context();
			omap2_sms_restore_context();
		}
	}
	omap3_intc_resume_idle();

	pwrdm_post_transition(NULL);

	/* PER */
	if (per_next_state < PWRDM_POWER_ON)
		omap2_gpio_resume_after_idle();
}

static void omap3_pm_idle(void)
{
	if (omap_irq_pending())
		return;

	trace_cpu_idle_rcuidle(1, smp_processor_id());

	omap_sram_idle();

	trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
}

#ifdef CONFIG_SUSPEND
static int omap3_pm_suspend(void)
{
	struct power_state *pwrst;
	int state, ret = 0;

	/* Read current next_pwrsts */
	list_for_each_entry(pwrst, &pwrst_list, node)
		pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
	/* Set ones wanted by suspend */
	list_for_each_entry(pwrst, &pwrst_list, node) {
		if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
			goto restore;
		if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
			goto restore;
	}

	omap3_intc_suspend();

	omap_sram_idle();

restore:
	/* Restore next_pwrsts */
	list_for_each_entry(pwrst, &pwrst_list, node) {
		state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
		if (state > pwrst->next_state) {
			pr_info("Powerdomain (%s) didn't enter target state %d\n",
				pwrst->pwrdm->name, pwrst->next_state);
			ret = -1;
		}
		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
	}
	if (ret)
		pr_err("Could not enter target state in pm_suspend\n");
	else
		pr_info("Successfully put all powerdomains to target state\n");

	return ret;
}
#else
#define omap3_pm_suspend NULL
#endif /* CONFIG_SUSPEND */

static void __init prcm_setup_regs(void)
{
	omap3_ctrl_init();

	omap3_prm_init_pm(cpu_is_omap3630(), omap3_has_iva());
}

void omap3_pm_off_mode_enable(int enable)
{
	struct power_state *pwrst;
	u32 state;

	if (enable)
		state = PWRDM_POWER_OFF;
	else
		state = PWRDM_POWER_RET;

	list_for_each_entry(pwrst, &pwrst_list, node) {
		if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
				pwrst->pwrdm == core_pwrdm &&
				state == PWRDM_POWER_OFF) {
			pwrst->next_state = PWRDM_POWER_RET;
			pr_warn("%s: Core OFF disabled due to errata i583\n",
				__func__);
		} else {
			pwrst->next_state = state;
		}
		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
	}
}

int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
{
	struct power_state *pwrst;

	list_for_each_entry(pwrst, &pwrst_list, node) {
		if (pwrst->pwrdm == pwrdm)
			return pwrst->next_state;
	}
	return -EINVAL;
}

int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
{
	struct power_state *pwrst;

	list_for_each_entry(pwrst, &pwrst_list, node) {
		if (pwrst->pwrdm == pwrdm) {
			pwrst->next_state = state;
			return 0;
		}
	}
	return -EINVAL;
}

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
{
	struct power_state *pwrst;

	if (!pwrdm->pwrsts)
		return 0;

	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
	if (!pwrst)
		return -ENOMEM;
	pwrst->pwrdm = pwrdm;
	pwrst->next_state = PWRDM_POWER_RET;
	list_add(&pwrst->node, &pwrst_list);

	if (pwrdm_has_hdwr_sar(pwrdm))
		pwrdm_enable_hdwr_sar(pwrdm);

	return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
}

/*
 * Push functions to SRAM
 *
 * The minimum set of functions is pushed to SRAM for execution:
 * - omap3_do_wfi for erratum i581 WA,
 * - save_secure_ram_context for security extensions.
 */
void omap_push_sram_idle(void)
{
	omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz);

	if (omap_type() != OMAP2_DEVICE_TYPE_GP)
		_omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
				save_secure_ram_context_sz);
}

static void __init pm_errata_configure(void)
{
	if (cpu_is_omap3630()) {
		pm34xx_errata |= PM_RTA_ERRATUM_i608;
		/* Enable the l2 cache toggling in sleep logic */
		enable_omap3630_toggle_l2_on_restore();
		if (omap_rev() < OMAP3630_REV_ES1_2)
			pm34xx_errata |= (PM_SDRC_WAKEUP_ERRATUM_i583 |
					  PM_PER_MEMORIES_ERRATUM_i582);
	} else if (cpu_is_omap34xx()) {
		pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582;
	}
}

int __init omap3_pm_init(void)
{
	struct power_state *pwrst, *tmp;
	struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm;
	int ret;

	if (!omap3_has_io_chain_ctrl())
		pr_warn("PM: no software I/O chain control; some wakeups may be lost\n");

	pm_errata_configure();

	/* XXX prcm_setup_regs needs to be before enabling hw
	 * supervised mode for powerdomains */
	prcm_setup_regs();

	ret = request_irq(omap_prcm_event_to_irq("wkup"),
		_prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);

	if (ret) {
		pr_err("pm: Failed to request pm_wkup irq\n");
		goto err1;
	}

	/* IO interrupt is shared with mux code */
	ret = request_irq(omap_prcm_event_to_irq("io"),
		_prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
		omap3_pm_init);
	enable_irq(omap_prcm_event_to_irq("io"));

	if (ret) {
		pr_err("pm: Failed to request pm_io irq\n");
		goto err2;
	}

	ret = pwrdm_for_each(pwrdms_setup, NULL);
	if (ret) {
		pr_err("Failed to setup powerdomains\n");
		goto err3;
	}

	(void) clkdm_for_each(omap_pm_clkdms_setup, NULL);

	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
	if (mpu_pwrdm == NULL) {
		pr_err("Failed to get mpu_pwrdm\n");
		ret = -EINVAL;
		goto err3;
	}

	neon_pwrdm = pwrdm_lookup("neon_pwrdm");
	per_pwrdm = pwrdm_lookup("per_pwrdm");
	core_pwrdm = pwrdm_lookup("core_pwrdm");

	neon_clkdm = clkdm_lookup("neon_clkdm");
	mpu_clkdm = clkdm_lookup("mpu_clkdm");
	per_clkdm = clkdm_lookup("per_clkdm");
	wkup_clkdm = clkdm_lookup("wkup_clkdm");

	omap_common_suspend_init(omap3_pm_suspend);

	arm_pm_idle = omap3_pm_idle;
	omap3_idle_init();

	/*
	 * RTA is disabled during initialization as per erratum i608
	 * it is safer to disable RTA by the bootloader, but we would like
	 * to be doubly sure here and prevent any mishaps.
	 */
	if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
		omap3630_ctrl_disable_rta();

	/*
	 * The UART3/4 FIFO and the sidetone memory in McBSP2/3 are
	 * not correctly reset when the PER powerdomain comes back
	 * from OFF or OSWR when the CORE powerdomain is kept active.
	 * See OMAP36xx Erratum i582 "PER Domain reset issue after
	 * Domain-OFF/OSWR Wakeup".  This wakeup dependency is not a
	 * complete workaround.  The kernel must also prevent the PER
	 * powerdomain from going to OSWR/OFF while the CORE
	 * powerdomain is not going to OSWR/OFF.  And if PER last
	 * power state was off while CORE last power state was ON, the
	 * UART3/4 and McBSP2/3 SIDETONE devices need to run a
	 * self-test using their loopback tests; if that fails, those
	 * devices are unusable until the PER/CORE can complete a transition
	 * from ON to OSWR/OFF and then back to ON.
	 *
	 * XXX Technically this workaround is only needed if off-mode
	 * or OSWR is enabled.
	 */
	if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582))
		clkdm_add_wkdep(per_clkdm, wkup_clkdm);

	clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
	if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
		omap3_secure_ram_storage =
			kmalloc(0x803F, GFP_KERNEL);
		if (!omap3_secure_ram_storage)
			pr_err("Memory allocation failed when allocating for secure sram context\n");

		local_irq_disable();

		omap_dma_global_context_save();
		omap3_save_secure_ram_context();
		omap_dma_global_context_restore();

		local_irq_enable();
	}

	omap3_save_scratchpad_contents();
	return ret;

err3:
	list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
		list_del(&pwrst->node);
		kfree(pwrst);
	}
	free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init);
err2:
	free_irq(omap_prcm_event_to_irq("wkup"), NULL);
err1:
	return ret;
}