2 * linux/arch/arm/mach-omap1/sleep.S
4 * Low-level OMAP7XX/1510/1610 sleep/wakeUp support
7 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
9 * Adapted for PXA by Nicolas Pitre:
10 * Copyright (c) 2002 Monta Vista Software, Inc.
12 * Support for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
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.
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.
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.
35 #include <linux/linkage.h>
36 #include <asm/assembler.h>
44 * Forces OMAP into deep sleep state
46 * omapXXXX_cpu_suspend()
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
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.
55 * Note: Because of errata work arounds we have processor specific functions
56 * here. They are mostly the same, but slightly different.
60 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
61 ENTRY(omap7xx_cpu_suspend)
63 @ save registers on stack
64 stmfd sp!, {r0 - r12, lr}
68 mcr p15, 0, r0, c7, c10, 4
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
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]
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]
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
92 @ turn off clock domains
93 @ do not disable PERCK (0x04)
94 mov r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff
95 orr r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00
96 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
99 mov r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff
100 orr r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00
101 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
103 @ disable instruction cache
104 mrc p15, 0, r9, c1, c0, 0
106 mcr p15, 0, r2, c1, c0, 0
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
114 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
116 * omap7xx_cpu_suspend()'s resume point.
118 * It will just start executing here, so we'll restore stuff from the
122 mcr p15, 0, r9, c1, c0, 0
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]
128 @ Restore EMIFF controls
129 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
130 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
132 @ restore regs and return
133 ldmfd sp!, {r0 - r12, pc}
135 ENTRY(omap7xx_cpu_suspend_sz)
136 .word . - omap7xx_cpu_suspend
137 #endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
139 #ifdef CONFIG_ARCH_OMAP15XX
140 ENTRY(omap1510_cpu_suspend)
142 @ save registers on stack
143 stmfd sp!, {r0 - r12, lr}
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
150 @ work around errata of OMAP1510 PDE bit for TC shut down
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]
157 and r5, r5, #PWD_EN_BIT & 0xff
158 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
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]
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]
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
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]
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]
186 mov r5, #IDLE_WAIT_CYCLES & 0xff
187 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
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
196 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
198 * omap1510_cpu_suspend()'s resume point.
200 * It will just start executing here, so we'll restore stuff from the
201 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
203 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
204 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
206 @ restore regs and return
207 ldmfd sp!, {r0 - r12, pc}
209 ENTRY(omap1510_cpu_suspend_sz)
210 .word . - omap1510_cpu_suspend
211 #endif /* CONFIG_ARCH_OMAP15XX */
213 #if defined(CONFIG_ARCH_OMAP16XX)
214 ENTRY(omap1610_cpu_suspend)
216 @ save registers on stack
217 stmfd sp!, {r0 - r12, lr}
221 mcr p15, 0, r0, c7, c10, 4
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
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]
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]
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
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]
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]
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
261 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
263 @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
264 @ according to this formula:
265 @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
269 @ => 74 nop-instructions
345 * omap1610_cpu_suspend()'s resume point.
347 * It will just start executing here, so we'll restore stuff from the
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]
354 @ Restore EMIFF controls
355 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
356 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
358 @ Restore regs and return
359 ldmfd sp!, {r0 - r12, pc}
361 ENTRY(omap1610_cpu_suspend_sz)
362 .word . - omap1610_cpu_suspend
363 #endif /* CONFIG_ARCH_OMAP16XX */