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 #ifdef CONFIG_ARCH_OMAP15XX
65 .align 3
66 ENTRY(omap1510_cpu_suspend)
67
68 @ save registers on stack
69 stmfd sp!, {r0 - r12, lr}
70
71 @ load base address of Traffic Controller
72 mov r4, #TCMIF_ASM_BASE & 0xff000000
73 orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
74 orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
75
76 @ work around errata of OMAP1510 PDE bit for TC shut down
77 @ clear PDE bit
78 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
79 bic r5, r5, #PDE_BIT & 0xff
80 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
81
82 @ set PWD_EN bit
83 and r5, r5, #PWD_EN_BIT & 0xff
84 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
85
86 @ prepare to put SDRAM into self-refresh manually
87 ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
88 orr r5, r5, #SELF_REFRESH_MODE & 0xff000000
89 orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff
90 str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
91
92 @ prepare to put EMIFS to Sleep
93 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
94 orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff
95 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
96
97 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
98 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
99 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
100 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
101
102 @ turn off clock domains
103 mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
104 orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
105 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
106
107 @ request ARM idle
108 mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
109 orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
110 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
111
112 mov r5, #IDLE_WAIT_CYCLES & 0xff
113 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
114 l_1510_2:
115 subs r5, r5, #1
116 bne l_1510_2
117 /*
118 * Let's wait for the next wake up event to wake us up. r0 can't be
119 * used here because r0 holds ARM_IDLECT1
120 */
121 mov r2, #0
122 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
123 /*
124 * omap1510_cpu_suspend()'s resume point.
125 *
126 * It will just start executing here, so we'll restore stuff from the
127 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
128 */
129 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
130 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
131
132 @ restore regs and return
133 ldmfd sp!, {r0 - r12, pc}
134
135 ENTRY(omap1510_cpu_suspend_sz)
136 .word . - omap1510_cpu_suspend
137 #endif /* CONFIG_ARCH_OMAP15XX */
138
139 #if defined(CONFIG_ARCH_OMAP16XX)
140 .align 3
141 ENTRY(omap1610_cpu_suspend)
142
143 @ save registers on stack
144 stmfd sp!, {r0 - r12, lr}
145
146 @ Drain write cache
147 mov r4, #0
148 mcr p15, 0, r0, c7, c10, 4
149 nop
150
151 @ Load base address of Traffic Controller
152 mov r6, #TCMIF_ASM_BASE & 0xff000000
153 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
154 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
155
156 @ Prepare to put SDRAM into self-refresh manually
157 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
158 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
159 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
160 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
161
162 @ Prepare to put EMIFS to Sleep
163 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
164 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
165 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
166
167 @ Load base address of ARM_IDLECT1 and ARM_IDLECT2
168 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
169 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
170 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
171
172 @ Turn off clock domains
173 @ Do not disable PERCK (0x04)
174 mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
175 orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
176 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
177
178 @ Request ARM idle
179 mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
180 orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
181 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
182
183 /*
184 * Let's wait for the next wake up event to wake us up. r0 can't be
185 * used here because r0 holds ARM_IDLECT1
186 */
187 mov r2, #0
188 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
189
190 @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
191 @ according to this formula:
192 @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
193 @ Max DPLL_MULT = 18
194 @ DPLL_DIV = 1
195 @ ARMDIV = 1
196 @ => 74 nop-instructions
197 nop
198 nop
199 nop
200 nop
201 nop
202 nop
203 nop
204 nop
205 nop
206 nop @10
207 nop
208 nop
209 nop
210 nop
211 nop
212 nop
213 nop
214 nop
215 nop
216 nop @20
217 nop
218 nop
219 nop
220 nop
221 nop
222 nop
223 nop
224 nop
225 nop
226 nop @30
227 nop
228 nop
229 nop
230 nop
231 nop
232 nop
233 nop
234 nop
235 nop
236 nop @40
237 nop
238 nop
239 nop
240 nop
241 nop
242 nop
243 nop
244 nop
245 nop
246 nop @50
247 nop
248 nop
249 nop
250 nop
251 nop
252 nop
253 nop
254 nop
255 nop
256 nop @60
257 nop
258 nop
259 nop
260 nop
261 nop
262 nop
263 nop
264 nop
265 nop
266 nop @70
267 nop
268 nop
269 nop
270 nop @74
271 /*
272 * omap1610_cpu_suspend()'s resume point.
273 *
274 * It will just start executing here, so we'll restore stuff from the
275 * stack.
276 */
277 @ Restore the ARM_IDLECT1 and ARM_IDLECT2.
278 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
279 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
280
281 @ Restore EMIFF controls
282 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
283 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
284
285 @ Restore regs and return
286 ldmfd sp!, {r0 - r12, pc}
287
288 ENTRY(omap1610_cpu_suspend_sz)
289 .word . - omap1610_cpu_suspend
290 #endif /* CONFIG_ARCH_OMAP16XX */
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