summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-common/pm.c
blob: 42fa87e8375cffcc7e951b3a901550d0e97a43cf (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
/*
 * Blackfin power management
 *
 * Copyright 2006-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2
 * based on arm/mach-omap/pm.c
 *    Copyright 2001, Cliff Brake <cbrake@accelent.com> and others
 */

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

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


void bfin_pm_suspend_standby_enter(void)
{
	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
}

int bf53x_suspend_l1_mem(unsigned char *memptr)
{
	dma_memcpy_nocache(memptr, (const void *) L1_CODE_START,
			L1_CODE_LENGTH);
	dma_memcpy_nocache(memptr + L1_CODE_LENGTH,
			(const void *) L1_DATA_A_START, L1_DATA_A_LENGTH);
	dma_memcpy_nocache(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_nocache((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
	dma_memcpy_nocache((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
			L1_DATA_A_LENGTH);
	dma_memcpy_nocache((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;
}

#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
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

int bfin_pm_suspend_mem_enter(void)
{
	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

	ret = blackfin_dma_suspend();

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

	bfin_gpio_pm_hibernate_suspend();

#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
	flushinv_all_dcache();
#endif
	_disable_dcplb();
	_disable_icplb();
	bf53x_suspend_l1_mem(memptr);

	do_hibernate(wakeup | vr_wakeup);	/* See you later! */

	bf53x_resume_l1_mem(memptr);

	_enable_icplb();
	_enable_dcplb();

	bfin_gpio_pm_hibernate_restore();
	blackfin_dma_resume();

	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);