xref: /openbmc/linux/arch/arm/mach-omap1/sleep.S (revision 6726d552) 
1/*
2 * linux/arch/arm/mach-omap1/sleep.S
3 *
4 * Low-level OMAP7XX/1510/1610 sleep/wakeUp support
5 *
6 * Initial SA1110 code:
7 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
8 *
9 * Adapted for PXA by Nicolas Pitre:
10 * Copyright (c) 2002 Monta Vista Software, Inc.
11 *
12 * Support for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
22 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
25 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * You should have received a copy of the GNU General Public License along
31 * with this program; if not, write to the Free Software Foundation, Inc.,
32 * 675 Mass Ave, Cambridge, MA 02139, USA.
33 */
34
35#include <linux/linkage.h>
36
37#include <asm/assembler.h>
38
39#include "hardware.h"
40
41#include "iomap.h"
42#include "pm.h"
43
44		.text
45
46
47/*
48 * Forces OMAP into deep sleep state
49 *
50 * omapXXXX_cpu_suspend()
51 *
52 * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed
53 * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1
54 * in register r1.
55 *
56 * Note: This code get's copied to internal SRAM at boot. When the OMAP
57 *	 wakes up it continues execution at the point it went to sleep.
58 *
59 * Note: Because of errata work arounds we have processor specific functions
60 *       here. They are mostly the same, but slightly different.
61 *
62 */
63
64#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
65	.align	3
66ENTRY(omap7xx_cpu_suspend)
67
68	@ save registers on stack
69	stmfd	sp!, {r0 - r12, lr}
70
71	@ Drain write cache
72	mov	r4, #0
73	mcr	p15, 0, r0, c7, c10, 4
74	nop
75
76	@ load base address of Traffic Controller
77	mov	r6, #TCMIF_ASM_BASE & 0xff000000
78	orr	r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
79	orr	r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
80
81	@ prepare to put SDRAM into self-refresh manually
82	ldr	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
83	orr	r9, r7, #SELF_REFRESH_MODE & 0xff000000
84	orr	r9, r9, #SELF_REFRESH_MODE & 0x000000ff
85	str	r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
86
87	@ prepare to put EMIFS to Sleep
88	ldr	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
89	orr	r9, r8, #IDLE_EMIFS_REQUEST & 0xff
90	str	r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
91
92	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
93	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
94	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
95	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
96
97	@ turn off clock domains
98	@ do not disable PERCK (0x04)
99	mov	r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff
100	orr	r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00
101	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
102
103	@ request ARM idle
104	mov	r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff
105	orr	r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00
106	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
107
108	@ disable instruction cache
109	mrc	p15, 0, r9, c1, c0, 0
110	bic	r2, r9, #0x1000
111	mcr	p15, 0, r2, c1, c0, 0
112	nop
113
114/*
115 * Let's wait for the next wake up event to wake us up. r0 can't be
116 * used here because r0 holds ARM_IDLECT1
117 */
118	mov	r2, #0
119	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
120/*
121 * omap7xx_cpu_suspend()'s resume point.
122 *
123 * It will just start executing here, so we'll restore stuff from the
124 * stack.
125 */
126	@ re-enable Icache
127	mcr	p15, 0, r9, c1, c0, 0
128
129	@ reset the ARM_IDLECT1 and ARM_IDLECT2.
130	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
131	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
132
133	@ Restore EMIFF controls
134	str	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
135	str	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
136
137	@ restore regs and return
138	ldmfd	sp!, {r0 - r12, pc}
139
140ENTRY(omap7xx_cpu_suspend_sz)
141	.word	. - omap7xx_cpu_suspend
142#endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
143
144#ifdef CONFIG_ARCH_OMAP15XX
145	.align	3
146ENTRY(omap1510_cpu_suspend)
147
148	@ save registers on stack
149	stmfd	sp!, {r0 - r12, lr}
150
151	@ load base address of Traffic Controller
152	mov	r4, #TCMIF_ASM_BASE & 0xff000000
153	orr	r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
154	orr	r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
155
156	@ work around errata of OMAP1510 PDE bit for TC shut down
157	@ clear PDE bit
158	ldr	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
159	bic	r5, r5, #PDE_BIT & 0xff
160	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
161
162	@ set PWD_EN bit
163	and	r5, r5, #PWD_EN_BIT & 0xff
164	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
165
166	@ prepare to put SDRAM into self-refresh manually
167	ldr	r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
168	orr	r5, r5, #SELF_REFRESH_MODE & 0xff000000
169	orr	r5, r5, #SELF_REFRESH_MODE & 0x000000ff
170	str	r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
171
172	@ prepare to put EMIFS to Sleep
173	ldr	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
174	orr	r5, r5, #IDLE_EMIFS_REQUEST & 0xff
175	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
176
177	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
178	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
179	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
180	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
181
182	@ turn off clock domains
183	mov	r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
184	orr	r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
185	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
186
187	@ request ARM idle
188	mov	r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
189	orr	r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
190	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
191
192	mov	r5, #IDLE_WAIT_CYCLES & 0xff
193	orr	r5, r5, #IDLE_WAIT_CYCLES & 0xff00
194l_1510_2:
195	subs	r5, r5, #1
196	bne	l_1510_2
197/*
198 * Let's wait for the next wake up event to wake us up. r0 can't be
199 * used here because r0 holds ARM_IDLECT1
200 */
201	mov	r2, #0
202	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
203/*
204 * omap1510_cpu_suspend()'s resume point.
205 *
206 * It will just start executing here, so we'll restore stuff from the
207 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
208 */
209	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
210	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
211
212	@ restore regs and return
213	ldmfd	sp!, {r0 - r12, pc}
214
215ENTRY(omap1510_cpu_suspend_sz)
216	.word	. - omap1510_cpu_suspend
217#endif /* CONFIG_ARCH_OMAP15XX */
218
219#if defined(CONFIG_ARCH_OMAP16XX)
220	.align	3
221ENTRY(omap1610_cpu_suspend)
222
223	@ save registers on stack
224	stmfd	sp!, {r0 - r12, lr}
225
226	@ Drain write cache
227	mov	r4, #0
228	mcr	p15, 0, r0, c7, c10, 4
229	nop
230
231	@ Load base address of Traffic Controller
232	mov	r6, #TCMIF_ASM_BASE & 0xff000000
233	orr	r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
234	orr	r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
235
236	@ Prepare to put SDRAM into self-refresh manually
237	ldr	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
238	orr	r9, r7, #SELF_REFRESH_MODE & 0xff000000
239	orr	r9, r9, #SELF_REFRESH_MODE & 0x000000ff
240	str	r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
241
242	@ Prepare to put EMIFS to Sleep
243	ldr	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
244	orr	r9, r8, #IDLE_EMIFS_REQUEST & 0xff
245	str	r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
246
247	@ Load base address of ARM_IDLECT1 and ARM_IDLECT2
248	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
249	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
250	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
251
252	@ Turn off clock domains
253	@ Do not disable PERCK (0x04)
254	mov	r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
255	orr	r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
256	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
257
258	@ Request ARM idle
259	mov	r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
260	orr	r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
261	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
262
263/*
264 * Let's wait for the next wake up event to wake us up. r0 can't be
265 * used here because r0 holds ARM_IDLECT1
266 */
267	mov	r2, #0
268	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
269
270	@ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
271	@ according to this formula:
272	@ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
273	@ Max DPLL_MULT = 18
274	@ DPLL_DIV = 1
275	@ ARMDIV = 1
276	@ => 74 nop-instructions
277	nop
278	nop
279	nop
280	nop
281	nop
282	nop
283	nop
284	nop
285	nop
286	nop	@10
287	nop
288	nop
289	nop
290	nop
291	nop
292	nop
293	nop
294	nop
295	nop
296	nop	@20
297	nop
298	nop
299	nop
300	nop
301	nop
302	nop
303	nop
304	nop
305	nop
306	nop	@30
307	nop
308	nop
309	nop
310	nop
311	nop
312	nop
313	nop
314	nop
315	nop
316	nop	@40
317	nop
318	nop
319	nop
320	nop
321	nop
322	nop
323	nop
324	nop
325	nop
326	nop	@50
327	nop
328	nop
329	nop
330	nop
331	nop
332	nop
333	nop
334	nop
335	nop
336	nop	@60
337	nop
338	nop
339	nop
340	nop
341	nop
342	nop
343	nop
344	nop
345	nop
346	nop	@70
347	nop
348	nop
349	nop
350	nop	@74
351/*
352 * omap1610_cpu_suspend()'s resume point.
353 *
354 * It will just start executing here, so we'll restore stuff from the
355 * stack.
356 */
357	@ Restore the ARM_IDLECT1 and ARM_IDLECT2.
358	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
359	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
360
361	@ Restore EMIFF controls
362	str	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
363	str	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
364
365	@ Restore regs and return
366	ldmfd	sp!, {r0 - r12, pc}
367
368ENTRY(omap1610_cpu_suspend_sz)
369	.word	. - omap1610_cpu_suspend
370#endif /* CONFIG_ARCH_OMAP16XX */
371