summaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-omap/sleep.S
blob: 9f745836f6aac97e8b76e8e61c9b516d3d4bf388 (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
/*
 * linux/arch/arm/plat-omap/sleep.S
 *
 * Low-level OMAP1510/1610 sleep/wakeUp support
 *
 * Initial SA1110 code:
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * Adapted for PXA by Nicolas Pitre:
 * Copyright (c) 2002 Monta Vista Software, Inc.
 *
 * Support for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
 *
 * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/arch/io.h>
#include <asm/arch/pm.h>

		.text

/*
 * Forces OMAP into idle state
 *
 * omapXXXX_idle_loop_suspend()
 *
 * Note: This code get's copied to internal SRAM at boot. When the OMAP
 *	 wakes up it continues execution at the point it went to sleep.
 *
 * Note: Because of slightly different configuration values we have
 *       processor specific functions here.
 */

#ifdef CONFIG_ARCH_OMAP1510
ENTRY(omap1510_idle_loop_suspend)

	stmfd	sp!, {r0 - r12, lr}		@ save registers on stack

	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00

	@ turn off clock domains
	@ get ARM_IDLECT2 into r2
	ldrh	r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
	mov	r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
	orr	r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]

	@ request ARM idle
	@ get ARM_IDLECT1 into r1
	ldrh	r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
	orr	r3, r1, #OMAP1510_IDLE_LOOP_REQUEST & 0xffff
	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	mov	r5, #IDLE_WAIT_CYCLES & 0xff
	orr	r5, r5, #IDLE_WAIT_CYCLES & 0xff00
l_1510:	subs	r5, r5, #1
	bne	l_1510
/*
 * Let's wait for the next clock tick to wake us up.
 */
	mov	r0, #0
	mcr	p15, 0, r0, c7, c0, 4		@ wait for interrupt
/*
 * omap1510_idle_loop_suspend()'s resume point.
 *
 * It will just start executing here, so we'll restore stuff from the
 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
 */

	@ restore ARM_IDLECT1 and ARM_IDLECT2 and return
	@ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2
	strh	r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
	strh	r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	ldmfd	sp!, {r0 - r12, pc}		@ restore regs and return

ENTRY(omap1510_idle_loop_suspend_sz)
	.word	. - omap1510_idle_loop_suspend
#endif /* CONFIG_ARCH_OMAP1510 */

#if defined(CONFIG_ARCH_OMAP16XX)
ENTRY(omap1610_idle_loop_suspend)

	stmfd	sp!, {r0 - r12, lr}		@ save registers on stack

	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00

	@ turn off clock domains
	@ get ARM_IDLECT2 into r2
	ldrh	r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
	mov	r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
	orr	r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]

	@ request ARM idle
	@ get ARM_IDLECT1 into r1
	ldrh	r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
	orr	r3, r1, #OMAP1610_IDLE_LOOP_REQUEST & 0xffff
	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	mov	r5, #IDLE_WAIT_CYCLES & 0xff
	orr	r5, r5, #IDLE_WAIT_CYCLES & 0xff00
l_1610:	subs	r5, r5, #1
	bne	l_1610
/*
 * Let's wait for the next clock tick to wake us up.
 */
	mov	r0, #0
	mcr	p15, 0, r0, c7, c0, 4		@ wait for interrupt
/*
 * omap1610_idle_loop_suspend()'s resume point.
 *
 * It will just start executing here, so we'll restore stuff from the
 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
 */

	@ restore ARM_IDLECT1 and ARM_IDLECT2 and return
	@ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2
	strh	r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
	strh	r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	ldmfd	sp!, {r0 - r12, pc}		@ restore regs and return

ENTRY(omap1610_idle_loop_suspend_sz)
	.word	. - omap1610_idle_loop_suspend
#endif /* CONFIG_ARCH_OMAP16XX */

/*
 * Forces OMAP into deep sleep state
 *
 * omapXXXX_cpu_suspend()
 *
 * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed
 * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1
 * in register r1.
 *
 * Note: This code get's copied to internal SRAM at boot. When the OMAP
 *	 wakes up it continues execution at the point it went to sleep.
 *
 * Note: Because of errata work arounds we have processor specific functions
 *       here. They are mostly the same, but slightly different.
 *
 */

#ifdef CONFIG_ARCH_OMAP1510
ENTRY(omap1510_cpu_suspend)

	@ save registers on stack
	stmfd	sp!, {r0 - r12, lr}

	@ load base address of Traffic Controller
	mov	r4, #TCMIF_ASM_BASE & 0xff000000
	orr	r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
	orr	r4, r4, #TCMIF_ASM_BASE & 0x0000ff00

	@ work around errata of OMAP1510 PDE bit for TC shut down
	@ clear PDE bit
	ldr	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
	bic	r5, r5, #PDE_BIT & 0xff
	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]

	@ set PWD_EN bit
	and	r5, r5, #PWD_EN_BIT & 0xff
	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]

	@ prepare to put SDRAM into self-refresh manually
	ldr	r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
	orr	r5, r5, #SELF_REFRESH_MODE & 0xff000000
	orr	r5, r5, #SELF_REFRESH_MODE & 0x000000ff
	str	r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]

	@ prepare to put EMIFS to Sleep
	ldr	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
	orr	r5, r5, #IDLE_EMIFS_REQUEST & 0xff
	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]

	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00

	@ turn off clock domains
	mov	r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
	orr	r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]

	@ request ARM idle
	mov	r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
	orr	r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	mov	r5, #IDLE_WAIT_CYCLES & 0xff
	orr	r5, r5, #IDLE_WAIT_CYCLES & 0xff00
l_1510_2:
	subs	r5, r5, #1
	bne	l_1510_2
/*
 * Let's wait for the next wake up event to wake us up. r0 can't be
 * used here because r0 holds ARM_IDLECT1
 */
	mov	r2, #0
	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
/*
 * omap1510_cpu_suspend()'s resume point.
 *
 * It will just start executing here, so we'll restore stuff from the
 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
 */
	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	@ restore regs and return
	ldmfd	sp!, {r0 - r12, pc}

ENTRY(omap1510_cpu_suspend_sz)
	.word	. - omap1510_cpu_suspend
#endif /* CONFIG_ARCH_OMAP1510 */

#if defined(CONFIG_ARCH_OMAP16XX)
ENTRY(omap1610_cpu_suspend)

	@ save registers on stack
	stmfd	sp!, {r0 - r12, lr}

	@ Drain write cache
	mov	r4, #0
	mcr	p15, 0, r0, c7, c10, 4
	nop

	@ load base address of Traffic Controller
	mov	r6, #TCMIF_ASM_BASE & 0xff000000
	orr	r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
	orr	r6, r6, #TCMIF_ASM_BASE & 0x0000ff00

	@ prepare to put SDRAM into self-refresh manually
	ldr	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
	orr	r9, r7, #SELF_REFRESH_MODE & 0xff000000
	orr	r9, r9, #SELF_REFRESH_MODE & 0x000000ff
	str	r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]

	@ prepare to put EMIFS to Sleep
	ldr	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
	orr	r9, r8, #IDLE_EMIFS_REQUEST & 0xff
	str	r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]

	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00

	@ turn off clock domains
	@ do not disable PERCK (0x04)
	mov	r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
	orr	r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]

	@ request ARM idle
	mov	r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
	orr	r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	@ disable instruction cache
	mrc	p15, 0, r9, c1, c0, 0
	bic	r2, r9, #0x1000
	mcr	p15, 0, r2, c1, c0, 0
	nop

/*
 * Let's wait for the next wake up event to wake us up. r0 can't be
 * used here because r0 holds ARM_IDLECT1
 */
	mov	r2, #0
	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
/*
 * omap1610_cpu_suspend()'s resume point.
 *
 * It will just start executing here, so we'll restore stuff from the
 * stack.
 */
	@ re-enable Icache
	mcr	p15, 0, r9, c1, c0, 0

	@ reset the ARM_IDLECT1 and ARM_IDLECT2.
	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]

	@ Restore EMIFF controls
	str	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
	str	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]

	@ restore regs and return
	ldmfd	sp!, {r0 - r12, pc}

ENTRY(omap1610_cpu_suspend_sz)
	.word	. - omap1610_cpu_suspend
#endif /* CONFIG_ARCH_OMAP16XX */
OpenPOWER on IntegriCloud