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Diffstat (limited to 'arch/arm/plat-omap/sleep.S')
-rw-r--r-- | arch/arm/plat-omap/sleep.S | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/sleep.S b/arch/arm/plat-omap/sleep.S new file mode 100644 index 000000000000..279490ce772b --- /dev/null +++ b/arch/arm/plat-omap/sleep.S | |||
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1 | /* | ||
2 | * linux/arch/arm/plat-omap/sleep.S | ||
3 | * | ||
4 | * Low-level OMAP1510/1610 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/config.h> | ||
36 | #include <linux/linkage.h> | ||
37 | #include <asm/assembler.h> | ||
38 | #include <asm/arch/io.h> | ||
39 | #include <asm/arch/pm.h> | ||
40 | |||
41 | .text | ||
42 | |||
43 | /* | ||
44 | * Forces OMAP into idle state | ||
45 | * | ||
46 | * omapXXXX_idle_loop_suspend() | ||
47 | * | ||
48 | * Note: This code get's copied to internal SRAM at boot. When the OMAP | ||
49 | * wakes up it continues execution at the point it went to sleep. | ||
50 | * | ||
51 | * Note: Because of slightly different configuration values we have | ||
52 | * processor specific functions here. | ||
53 | */ | ||
54 | |||
55 | #ifdef CONFIG_ARCH_OMAP1510 | ||
56 | ENTRY(omap1510_idle_loop_suspend) | ||
57 | |||
58 | stmfd sp!, {r0 - r12, lr} @ save registers on stack | ||
59 | |||
60 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
61 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
62 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
63 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
64 | |||
65 | @ turn off clock domains | ||
66 | @ get ARM_IDLECT2 into r2 | ||
67 | ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
68 | mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff | ||
69 | orr r5,r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00 | ||
70 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
71 | |||
72 | @ request ARM idle | ||
73 | @ get ARM_IDLECT1 into r1 | ||
74 | ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
75 | orr r3, r1, #OMAP1510_IDLE_LOOP_REQUEST & 0xffff | ||
76 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
77 | |||
78 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
79 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
80 | l_1510: subs r5, r5, #1 | ||
81 | bne l_1510 | ||
82 | /* | ||
83 | * Let's wait for the next clock tick to wake us up. | ||
84 | */ | ||
85 | mov r0, #0 | ||
86 | mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt | ||
87 | /* | ||
88 | * omap1510_idle_loop_suspend()'s resume point. | ||
89 | * | ||
90 | * It will just start executing here, so we'll restore stuff from the | ||
91 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
92 | */ | ||
93 | |||
94 | @ restore ARM_IDLECT1 and ARM_IDLECT2 and return | ||
95 | @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2 | ||
96 | strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
97 | strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
98 | |||
99 | ldmfd sp!, {r0 - r12, pc} @ restore regs and return | ||
100 | |||
101 | ENTRY(omap1510_idle_loop_suspend_sz) | ||
102 | .word . - omap1510_idle_loop_suspend | ||
103 | #endif /* CONFIG_ARCH_OMAP1510 */ | ||
104 | |||
105 | #if defined(CONFIG_ARCH_OMAP16XX) | ||
106 | ENTRY(omap1610_idle_loop_suspend) | ||
107 | |||
108 | stmfd sp!, {r0 - r12, lr} @ save registers on stack | ||
109 | |||
110 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
111 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
112 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
113 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
114 | |||
115 | @ turn off clock domains | ||
116 | @ get ARM_IDLECT2 into r2 | ||
117 | ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
118 | mov r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff | ||
119 | orr r5,r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff00 | ||
120 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
121 | |||
122 | @ request ARM idle | ||
123 | @ get ARM_IDLECT1 into r1 | ||
124 | ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
125 | orr r3, r1, #OMAP1610_IDLE_LOOP_REQUEST & 0xffff | ||
126 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
127 | |||
128 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
129 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
130 | l_1610: subs r5, r5, #1 | ||
131 | bne l_1610 | ||
132 | /* | ||
133 | * Let's wait for the next clock tick to wake us up. | ||
134 | */ | ||
135 | mov r0, #0 | ||
136 | mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt | ||
137 | /* | ||
138 | * omap1610_idle_loop_suspend()'s resume point. | ||
139 | * | ||
140 | * It will just start executing here, so we'll restore stuff from the | ||
141 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
142 | */ | ||
143 | |||
144 | @ restore ARM_IDLECT1 and ARM_IDLECT2 and return | ||
145 | @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2 | ||
146 | strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
147 | strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
148 | |||
149 | ldmfd sp!, {r0 - r12, pc} @ restore regs and return | ||
150 | |||
151 | ENTRY(omap1610_idle_loop_suspend_sz) | ||
152 | .word . - omap1610_idle_loop_suspend | ||
153 | #endif /* CONFIG_ARCH_OMAP16XX */ | ||
154 | |||
155 | /* | ||
156 | * Forces OMAP into deep sleep state | ||
157 | * | ||
158 | * omapXXXX_cpu_suspend() | ||
159 | * | ||
160 | * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed | ||
161 | * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1 | ||
162 | * in register r1. | ||
163 | * | ||
164 | * Note: This code get's copied to internal SRAM at boot. When the OMAP | ||
165 | * wakes up it continues execution at the point it went to sleep. | ||
166 | * | ||
167 | * Note: Because of errata work arounds we have processor specific functions | ||
168 | * here. They are mostly the same, but slightly different. | ||
169 | * | ||
170 | */ | ||
171 | |||
172 | #ifdef CONFIG_ARCH_OMAP1510 | ||
173 | ENTRY(omap1510_cpu_suspend) | ||
174 | |||
175 | @ save registers on stack | ||
176 | stmfd sp!, {r0 - r12, lr} | ||
177 | |||
178 | @ load base address of Traffic Controller | ||
179 | mov r4, #TCMIF_ASM_BASE & 0xff000000 | ||
180 | orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000 | ||
181 | orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00 | ||
182 | |||
183 | @ work around errata of OMAP1510 PDE bit for TC shut down | ||
184 | @ clear PDE bit | ||
185 | ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
186 | bic r5, r5, #PDE_BIT & 0xff | ||
187 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
188 | |||
189 | @ set PWD_EN bit | ||
190 | and r5, r5, #PWD_EN_BIT & 0xff | ||
191 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
192 | |||
193 | @ prepare to put SDRAM into self-refresh manually | ||
194 | ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
195 | orr r5, r5, #SELF_REFRESH_MODE & 0xff000000 | ||
196 | orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff | ||
197 | str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
198 | |||
199 | @ prepare to put EMIFS to Sleep | ||
200 | ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
201 | orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff | ||
202 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
203 | |||
204 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
205 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
206 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
207 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
208 | |||
209 | @ turn off clock domains | ||
210 | mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff | ||
211 | orr r5,r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00 | ||
212 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
213 | |||
214 | @ request ARM idle | ||
215 | mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff | ||
216 | orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00 | ||
217 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
218 | |||
219 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
220 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
221 | l_1510_2: | ||
222 | subs r5, r5, #1 | ||
223 | bne l_1510_2 | ||
224 | /* | ||
225 | * Let's wait for the next wake up event to wake us up. r0 can't be | ||
226 | * used here because r0 holds ARM_IDLECT1 | ||
227 | */ | ||
228 | mov r2, #0 | ||
229 | mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt | ||
230 | /* | ||
231 | * omap1510_cpu_suspend()'s resume point. | ||
232 | * | ||
233 | * It will just start executing here, so we'll restore stuff from the | ||
234 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
235 | */ | ||
236 | strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
237 | strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
238 | |||
239 | @ restore regs and return | ||
240 | ldmfd sp!, {r0 - r12, pc} | ||
241 | |||
242 | ENTRY(omap1510_cpu_suspend_sz) | ||
243 | .word . - omap1510_cpu_suspend | ||
244 | #endif /* CONFIG_ARCH_OMAP1510 */ | ||
245 | |||
246 | #if defined(CONFIG_ARCH_OMAP16XX) | ||
247 | ENTRY(omap1610_cpu_suspend) | ||
248 | |||
249 | @ save registers on stack | ||
250 | stmfd sp!, {r0 - r12, lr} | ||
251 | |||
252 | @ load base address of Traffic Controller | ||
253 | mov r4, #TCMIF_ASM_BASE & 0xff000000 | ||
254 | orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000 | ||
255 | orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00 | ||
256 | |||
257 | @ prepare to put SDRAM into self-refresh manually | ||
258 | ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
259 | orr r5, r5, #SELF_REFRESH_MODE & 0xff000000 | ||
260 | orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff | ||
261 | str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
262 | |||
263 | @ prepare to put EMIFS to Sleep | ||
264 | ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
265 | orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff | ||
266 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
267 | |||
268 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
269 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
270 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
271 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
272 | |||
273 | @ turn off clock domains | ||
274 | mov r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff | ||
275 | orr r5,r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff00 | ||
276 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
277 | |||
278 | @ work around errata of OMAP1610/5912. Enable (!) peripheral | ||
279 | @ clock to let the chip go into deep sleep | ||
280 | ldrh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
281 | orr r5,r5, #EN_PERCK_BIT & 0xff | ||
282 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
283 | |||
284 | @ request ARM idle | ||
285 | mov r3, #OMAP1610_DEEP_SLEEP_REQUEST & 0xff | ||
286 | orr r3, r3, #OMAP1610_DEEP_SLEEP_REQUEST & 0xff00 | ||
287 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
288 | |||
289 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
290 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
291 | l_1610_2: | ||
292 | subs r5, r5, #1 | ||
293 | bne l_1610_2 | ||
294 | /* | ||
295 | * Let's wait for the next wake up event to wake us up. r0 can't be | ||
296 | * used here because r0 holds ARM_IDLECT1 | ||
297 | */ | ||
298 | mov r2, #0 | ||
299 | mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt | ||
300 | /* | ||
301 | * omap1610_cpu_suspend()'s resume point. | ||
302 | * | ||
303 | * It will just start executing here, so we'll restore stuff from the | ||
304 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
305 | */ | ||
306 | strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
307 | strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
308 | |||
309 | @ restore regs and return | ||
310 | ldmfd sp!, {r0 - r12, pc} | ||
311 | |||
312 | ENTRY(omap1610_cpu_suspend_sz) | ||
313 | .word . - omap1610_cpu_suspend | ||
314 | #endif /* CONFIG_ARCH_OMAP16XX */ | ||