aboutsummaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-common/pm.c
blob: bce5a84be49f30087f69cd8170ab89a32ed26b90 (plain) (blame)
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
/*
 * File:         arch/blackfin/mach-common/pm.c
 * Based on:     arm/mach-omap/pm.c
 * Author:       Cliff Brake <cbrake@accelent.com> Copyright (c) 2001
 *
 * Created:      2001
 * Description:  Blackfin power management
 *
 * Modified:     Nicolas Pitre - PXA250 support
 *                Copyright (c) 2002 Monta Vista Software, Inc.
 *               David Singleton - OMAP1510
 *                Copyright (c) 2002 Monta Vista Software, Inc.
 *               Dirk Behme <dirk.behme@de.bosch.com> - OMAP1510/1610
 *                Copyright 2004
 *               Copyright 2004-2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/io.h>
#include <linux/irq.h>

#include <asm/gpio.h>
#include <asm/dma.h>
#include <asm/dpmc.h>

#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_H
#define WAKEUP_TYPE	PM_WAKE_HIGH
#endif

#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_L
#define WAKEUP_TYPE	PM_WAKE_LOW
#endif

#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_F
#define WAKEUP_TYPE	PM_WAKE_FALLING
#endif

#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_R
#define WAKEUP_TYPE	PM_WAKE_RISING
#endif

#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_B
#define WAKEUP_TYPE	PM_WAKE_BOTH_EDGES
#endif


void bfin_pm_suspend_standby_enter(void)
{
	unsigned long flags;

#ifdef CONFIG_PM_WAKEUP_BY_GPIO
	gpio_pm_wakeup_request(CONFIG_PM_WAKEUP_GPIO_NUMBER, WAKEUP_TYPE);
#endif

	local_irq_save_hw(flags);
	bfin_pm_standby_setup();

#ifdef CONFIG_PM_BFIN_SLEEP_DEEPER
	sleep_deeper(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
#else
	sleep_mode(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
#endif

	bfin_pm_standby_restore();

#ifdef SIC_IWR0
	bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
# ifdef SIC_IWR1
	/* BF52x system reset does not properly reset SIC_IWR1 which
	 * will screw up the bootrom as it relies on MDMA0/1 waking it
	 * up from IDLE instructions.  See this report for more info:
	 * http://blackfin.uclinux.org/gf/tracker/4323
	 */
	if (ANOMALY_05000435)
		bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
	else
		bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
# endif
# ifdef SIC_IWR2
	bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
# endif
#else
	bfin_write_SIC_IWR(IWR_DISABLE_ALL);
#endif

	local_irq_restore_hw(flags);
}

int bf53x_suspend_l1_mem(unsigned char *memptr)
{
	dma_memcpy(memptr, (const void *) L1_CODE_START, L1_CODE_LENGTH);
	dma_memcpy(memptr + L1_CODE_LENGTH, (const void *) L1_DATA_A_START,
			L1_DATA_A_LENGTH);
	dma_memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH,
			(const void *) L1_DATA_B_START, L1_DATA_B_LENGTH);
	memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH +
			L1_DATA_B_LENGTH, (const void *) L1_SCRATCH_START,
			L1_SCRATCH_LENGTH);

	return 0;
}

int bf53x_resume_l1_mem(unsigned char *memptr)
{
	dma_memcpy((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
	dma_memcpy((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
			L1_DATA_A_LENGTH);
	dma_memcpy((void *) L1_DATA_B_START, memptr + L1_CODE_LENGTH +
			L1_DATA_A_LENGTH, L1_DATA_B_LENGTH);
	memcpy((void *) L1_SCRATCH_START, memptr + L1_CODE_LENGTH +
			L1_DATA_A_LENGTH + L1_DATA_B_LENGTH, L1_SCRATCH_LENGTH);

	return 0;
}

#ifdef CONFIG_BFIN_WB
static void flushinv_all_dcache(void)
{
	u32 way, bank, subbank, set;
	u32 status, addr;
	u32 dmem_ctl = bfin_read_DMEM_CONTROL();

	for (bank = 0; bank < 2; ++bank) {
		if (!(dmem_ctl & (1 << (DMC1_P - bank))))
			continue;

		for (way = 0; way < 2; ++way)
			for (subbank = 0; subbank < 4; ++subbank)
				for (set = 0; set < 64; ++set) {

					bfin_write_DTEST_COMMAND(
						way << 26 |
						bank << 23 |
						subbank << 16 |
						set << 5
					);
					CSYNC();
					status = bfin_read_DTEST_DATA0();

					/* only worry about valid/dirty entries */
					if ((status & 0x3) != 0x3)
						continue;

					/* construct the address using the tag */
					addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);

					/* flush it */
					__asm__ __volatile__("FLUSHINV[%0];" : : "a"(addr));
				}
	}
}
#endif

static inline void dcache_disable(void)
{
#ifdef CONFIG_BFIN_DCACHE
	unsigned long ctrl;

#ifdef CONFIG_BFIN_WB
	flushinv_all_dcache();
#endif
	SSYNC();
	ctrl = bfin_read_DMEM_CONTROL();
	ctrl &= ~ENDCPLB;
	bfin_write_DMEM_CONTROL(ctrl);
	SSYNC();
#endif
}

static inline void dcache_enable(void)
{
#ifdef CONFIG_BFIN_DCACHE
	unsigned long ctrl;
	SSYNC();
	ctrl = bfin_read_DMEM_CONTROL();
	ctrl |= ENDCPLB;
	bfin_write_DMEM_CONTROL(ctrl);
	SSYNC();
#endif
}

static inline void icache_disable(void)
{
#ifdef CONFIG_BFIN_ICACHE
	unsigned long ctrl;
	SSYNC();
	ctrl = bfin_read_IMEM_CONTROL();
	ctrl &= ~ENICPLB;
	bfin_write_IMEM_CONTROL(ctrl);
	SSYNC();
#endif
}

static inline void icache_enable(void)
{
#ifdef CONFIG_BFIN_ICACHE
	unsigned long ctrl;
	SSYNC();
	ctrl = bfin_read_IMEM_CONTROL();
	ctrl |= ENICPLB;
	bfin_write_IMEM_CONTROL(ctrl);
	SSYNC();
#endif
}

int bfin_pm_suspend_mem_enter(void)
{
	unsigned long flags;
	int wakeup, ret;

	unsigned char *memptr = kmalloc(L1_CODE_LENGTH + L1_DATA_A_LENGTH
					 + L1_DATA_B_LENGTH + L1_SCRATCH_LENGTH,
					  GFP_KERNEL);

	if (memptr == NULL) {
		panic("bf53x_suspend_l1_mem malloc failed");
		return -ENOMEM;
	}

	wakeup = bfin_read_VR_CTL() & ~FREQ;
	wakeup |= SCKELOW;

#ifdef CONFIG_PM_BFIN_WAKE_PH6
	wakeup |= PHYWE;
#endif
#ifdef CONFIG_PM_BFIN_WAKE_GP
	wakeup |= GPWE;
#endif

	local_irq_save_hw(flags);

	ret = blackfin_dma_suspend();

	if (ret) {
		local_irq_restore_hw(flags);
		kfree(memptr);
		return ret;
	}

	bfin_gpio_pm_hibernate_suspend();

	dcache_disable();
	icache_disable();
	bf53x_suspend_l1_mem(memptr);

	do_hibernate(wakeup | vr_wakeup);	/* Goodbye */

	bf53x_resume_l1_mem(memptr);

	icache_enable();
	dcache_enable();

	bfin_gpio_pm_hibernate_restore();
	blackfin_dma_resume();

	local_irq_restore_hw(flags);
	kfree(memptr);

	return 0;
}

/*
 *	bfin_pm_valid - Tell the PM core that we only support the standby sleep
 *			state
 *	@state:		suspend state we're checking.
 *
 */
static int bfin_pm_valid(suspend_state_t state)
{
	return (state == PM_SUSPEND_STANDBY
#if !(defined(BF533_FAMILY) || defined(CONFIG_BF561))
	/*
	 * On BF533/2/1:
	 * If we enter Hibernate the SCKE Pin is driven Low,
	 * so that the SDRAM enters Self Refresh Mode.
	 * However when the reset sequence that follows hibernate
	 * state is executed, SCKE is driven High, taking the
	 * SDRAM out of Self Refresh.
	 *
	 * If you reconfigure and access the SDRAM "very quickly",
	 * you are likely to avoid errors, otherwise the SDRAM
	 * start losing its contents.
	 * An external HW workaround is possible using logic gates.
	 */
	|| state == PM_SUSPEND_MEM
#endif
	);
}

/*
 *	bfin_pm_enter - Actually enter a sleep state.
 *	@state:		State we're entering.
 *
 */
static int bfin_pm_enter(suspend_state_t state)
{
	switch (state) {
	case PM_SUSPEND_STANDBY:
		bfin_pm_suspend_standby_enter();
		break;
	case PM_SUSPEND_MEM:
		bfin_pm_suspend_mem_enter();
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

struct platform_suspend_ops bfin_pm_ops = {
	.enter = bfin_pm_enter,
	.valid	= bfin_pm_valid,
};

static int __init bfin_pm_init(void)
{
	suspend_set_ops(&bfin_pm_ops);
	return 0;
}

__initcall(bfin_pm_init);