xref: /openbmc/linux/arch/arm/mach-omap1/sleep.S (revision 384740dc) 
1/*
2 * linux/arch/arm/mach-omap1/sleep.S
3 *
4 * Low-level OMAP730/1510/1610 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#include <asm/assembler.h>
37#include <mach/io.h>
38#include <mach/pm.h>
39
40		.text
41
42
43/*
44 * Forces OMAP into deep sleep state
45 *
46 * omapXXXX_cpu_suspend()
47 *
48 * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed
49 * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1
50 * in register r1.
51 *
52 * Note: This code get's copied to internal SRAM at boot. When the OMAP
53 *	 wakes up it continues execution at the point it went to sleep.
54 *
55 * Note: Because of errata work arounds we have processor specific functions
56 *       here. They are mostly the same, but slightly different.
57 *
58 */
59
60#if defined(CONFIG_ARCH_OMAP730)
61ENTRY(omap730_cpu_suspend)
62
63	@ save registers on stack
64	stmfd	sp!, {r0 - r12, lr}
65
66	@ Drain write cache
67	mov	r4, #0
68	mcr	p15, 0, r0, c7, c10, 4
69	nop
70
71	@ load base address of Traffic Controller
72	mov	r6, #TCMIF_ASM_BASE & 0xff000000
73	orr	r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
74	orr	r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
75
76	@ prepare to put SDRAM into self-refresh manually
77	ldr	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
78	orr	r9, r7, #SELF_REFRESH_MODE & 0xff000000
79	orr	r9, r9, #SELF_REFRESH_MODE & 0x000000ff
80	str	r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
81
82	@ prepare to put EMIFS to Sleep
83	ldr	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
84	orr	r9, r8, #IDLE_EMIFS_REQUEST & 0xff
85	str	r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
86
87	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
88	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
89	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
90	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
91
92	@ turn off clock domains
93	@ do not disable PERCK (0x04)
94	mov	r5, #OMAP730_IDLECT2_SLEEP_VAL & 0xff
95	orr	r5, r5, #OMAP730_IDLECT2_SLEEP_VAL & 0xff00
96	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
97
98	@ request ARM idle
99	mov	r3, #OMAP730_IDLECT1_SLEEP_VAL & 0xff
100	orr	r3, r3, #OMAP730_IDLECT1_SLEEP_VAL & 0xff00
101	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
102
103	@ disable instruction cache
104	mrc	p15, 0, r9, c1, c0, 0
105	bic	r2, r9, #0x1000
106	mcr	p15, 0, r2, c1, c0, 0
107	nop
108
109/*
110 * Let's wait for the next wake up event to wake us up. r0 can't be
111 * used here because r0 holds ARM_IDLECT1
112 */
113	mov	r2, #0
114	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
115/*
116 * omap730_cpu_suspend()'s resume point.
117 *
118 * It will just start executing here, so we'll restore stuff from the
119 * stack.
120 */
121	@ re-enable Icache
122	mcr	p15, 0, r9, c1, c0, 0
123
124	@ reset the ARM_IDLECT1 and ARM_IDLECT2.
125	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
126	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
127
128	@ Restore EMIFF controls
129	str	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
130	str	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
131
132	@ restore regs and return
133	ldmfd	sp!, {r0 - r12, pc}
134
135ENTRY(omap730_cpu_suspend_sz)
136	.word	. - omap730_cpu_suspend
137#endif /* CONFIG_ARCH_OMAP730 */
138
139#ifdef CONFIG_ARCH_OMAP15XX
140ENTRY(omap1510_cpu_suspend)
141
142	@ save registers on stack
143	stmfd	sp!, {r0 - r12, lr}
144
145	@ load base address of Traffic Controller
146	mov	r4, #TCMIF_ASM_BASE & 0xff000000
147	orr	r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
148	orr	r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
149
150	@ work around errata of OMAP1510 PDE bit for TC shut down
151	@ clear PDE bit
152	ldr	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
153	bic	r5, r5, #PDE_BIT & 0xff
154	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
155
156	@ set PWD_EN bit
157	and	r5, r5, #PWD_EN_BIT & 0xff
158	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
159
160	@ prepare to put SDRAM into self-refresh manually
161	ldr	r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
162	orr	r5, r5, #SELF_REFRESH_MODE & 0xff000000
163	orr	r5, r5, #SELF_REFRESH_MODE & 0x000000ff
164	str	r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
165
166	@ prepare to put EMIFS to Sleep
167	ldr	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
168	orr	r5, r5, #IDLE_EMIFS_REQUEST & 0xff
169	str	r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
170
171	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
172	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
173	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
174	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
175
176	@ turn off clock domains
177	mov	r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
178	orr	r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
179	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
180
181	@ request ARM idle
182	mov	r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
183	orr	r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
184	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
185
186	mov	r5, #IDLE_WAIT_CYCLES & 0xff
187	orr	r5, r5, #IDLE_WAIT_CYCLES & 0xff00
188l_1510_2:
189	subs	r5, r5, #1
190	bne	l_1510_2
191/*
192 * Let's wait for the next wake up event to wake us up. r0 can't be
193 * used here because r0 holds ARM_IDLECT1
194 */
195	mov	r2, #0
196	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
197/*
198 * omap1510_cpu_suspend()'s resume point.
199 *
200 * It will just start executing here, so we'll restore stuff from the
201 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
202 */
203	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
204	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
205
206	@ restore regs and return
207	ldmfd	sp!, {r0 - r12, pc}
208
209ENTRY(omap1510_cpu_suspend_sz)
210	.word	. - omap1510_cpu_suspend
211#endif /* CONFIG_ARCH_OMAP15XX */
212
213#if defined(CONFIG_ARCH_OMAP16XX)
214ENTRY(omap1610_cpu_suspend)
215
216	@ save registers on stack
217	stmfd	sp!, {r0 - r12, lr}
218
219	@ Drain write cache
220	mov	r4, #0
221	mcr	p15, 0, r0, c7, c10, 4
222	nop
223
224	@ Load base address of Traffic Controller
225	mov	r6, #TCMIF_ASM_BASE & 0xff000000
226	orr	r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
227	orr	r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
228
229	@ Prepare to put SDRAM into self-refresh manually
230	ldr	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
231	orr	r9, r7, #SELF_REFRESH_MODE & 0xff000000
232	orr	r9, r9, #SELF_REFRESH_MODE & 0x000000ff
233	str	r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
234
235	@ Prepare to put EMIFS to Sleep
236	ldr	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
237	orr	r9, r8, #IDLE_EMIFS_REQUEST & 0xff
238	str	r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
239
240	@ Load base address of ARM_IDLECT1 and ARM_IDLECT2
241	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
242	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
243	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
244
245	@ Turn off clock domains
246	@ Do not disable PERCK (0x04)
247	mov	r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
248	orr	r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
249	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
250
251	@ Request ARM idle
252	mov	r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
253	orr	r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
254	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
255
256/*
257 * Let's wait for the next wake up event to wake us up. r0 can't be
258 * used here because r0 holds ARM_IDLECT1
259 */
260	mov	r2, #0
261	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
262
263	@ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
264	@ according to this formula:
265	@ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
266	@ Max DPLL_MULT = 18
267	@ DPLL_DIV = 1
268	@ ARMDIV = 1
269	@ => 74 nop-instructions
270	nop
271	nop
272	nop
273	nop
274	nop
275	nop
276	nop
277	nop
278	nop
279	nop	@10
280	nop
281	nop
282	nop
283	nop
284	nop
285	nop
286	nop
287	nop
288	nop
289	nop	@20
290	nop
291	nop
292	nop
293	nop
294	nop
295	nop
296	nop
297	nop
298	nop
299	nop	@30
300	nop
301	nop
302	nop
303	nop
304	nop
305	nop
306	nop
307	nop
308	nop
309	nop	@40
310	nop
311	nop
312	nop
313	nop
314	nop
315	nop
316	nop
317	nop
318	nop
319	nop	@50
320	nop
321	nop
322	nop
323	nop
324	nop
325	nop
326	nop
327	nop
328	nop
329	nop	@60
330	nop
331	nop
332	nop
333	nop
334	nop
335	nop
336	nop
337	nop
338	nop
339	nop	@70
340	nop
341	nop
342	nop
343	nop	@74
344/*
345 * omap1610_cpu_suspend()'s resume point.
346 *
347 * It will just start executing here, so we'll restore stuff from the
348 * stack.
349 */
350	@ Restore the ARM_IDLECT1 and ARM_IDLECT2.
351	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
352	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
353
354	@ Restore EMIFF controls
355	str	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
356	str	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
357
358	@ Restore regs and return
359	ldmfd	sp!, {r0 - r12, pc}
360
361ENTRY(omap1610_cpu_suspend_sz)
362	.word	. - omap1610_cpu_suspend
363#endif /* CONFIG_ARCH_OMAP16XX */
364