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)
62 ENTRY(omap7xx_cpu_suspend)
64 @ save registers on stack
65 stmfd sp!, {r0 - r12, lr}
69 mcr p15, 0, r0, c7, c10, 4
72 @ load base address of Traffic Controller
73 mov r6, #TCMIF_ASM_BASE & 0xff000000
74 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
75 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
77 @ prepare to put SDRAM into self-refresh manually
78 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
79 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
80 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
81 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
83 @ prepare to put EMIFS to Sleep
84 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
85 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
86 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
88 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
89 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
90 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
91 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
93 @ turn off clock domains
94 @ do not disable PERCK (0x04)
95 mov r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff
96 orr r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00
97 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
100 mov r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff
101 orr r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00
102 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
104 @ disable instruction cache
105 mrc p15, 0, r9, c1, c0, 0
107 mcr p15, 0, r2, c1, c0, 0
111 * Let's wait for the next wake up event to wake us up. r0 can't be
112 * used here because r0 holds ARM_IDLECT1
115 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
117 * omap7xx_cpu_suspend()'s resume point.
119 * It will just start executing here, so we'll restore stuff from the
123 mcr p15, 0, r9, c1, c0, 0
125 @ reset the ARM_IDLECT1 and ARM_IDLECT2.
126 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
127 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
129 @ Restore EMIFF controls
130 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
131 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
133 @ restore regs and return
134 ldmfd sp!, {r0 - r12, pc}
136 ENTRY(omap7xx_cpu_suspend_sz)
137 .word . - omap7xx_cpu_suspend
138 #endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
140 #ifdef CONFIG_ARCH_OMAP15XX
142 ENTRY(omap1510_cpu_suspend)
144 @ save registers on stack
145 stmfd sp!, {r0 - r12, lr}
147 @ load base address of Traffic Controller
148 mov r4, #TCMIF_ASM_BASE & 0xff000000
149 orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
150 orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
152 @ work around errata of OMAP1510 PDE bit for TC shut down
154 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
155 bic r5, r5, #PDE_BIT & 0xff
156 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
159 and r5, r5, #PWD_EN_BIT & 0xff
160 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
162 @ prepare to put SDRAM into self-refresh manually
163 ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
164 orr r5, r5, #SELF_REFRESH_MODE & 0xff000000
165 orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff
166 str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
168 @ prepare to put EMIFS to Sleep
169 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
170 orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff
171 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
173 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
174 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
175 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
176 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
178 @ turn off clock domains
179 mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
180 orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
181 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
184 mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
185 orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
186 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
188 mov r5, #IDLE_WAIT_CYCLES & 0xff
189 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
194 * Let's wait for the next wake up event to wake us up. r0 can't be
195 * used here because r0 holds ARM_IDLECT1
198 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
200 * omap1510_cpu_suspend()'s resume point.
202 * It will just start executing here, so we'll restore stuff from the
203 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
205 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
206 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
208 @ restore regs and return
209 ldmfd sp!, {r0 - r12, pc}
211 ENTRY(omap1510_cpu_suspend_sz)
212 .word . - omap1510_cpu_suspend
213 #endif /* CONFIG_ARCH_OMAP15XX */
215 #if defined(CONFIG_ARCH_OMAP16XX)
217 ENTRY(omap1610_cpu_suspend)
219 @ save registers on stack
220 stmfd sp!, {r0 - r12, lr}
224 mcr p15, 0, r0, c7, c10, 4
227 @ Load base address of Traffic Controller
228 mov r6, #TCMIF_ASM_BASE & 0xff000000
229 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
230 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
232 @ Prepare to put SDRAM into self-refresh manually
233 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
234 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
235 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
236 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
238 @ Prepare to put EMIFS to Sleep
239 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
240 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
241 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
243 @ Load base address of ARM_IDLECT1 and ARM_IDLECT2
244 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
245 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
246 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
248 @ Turn off clock domains
249 @ Do not disable PERCK (0x04)
250 mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
251 orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
252 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
255 mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
256 orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
257 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
260 * Let's wait for the next wake up event to wake us up. r0 can't be
261 * used here because r0 holds ARM_IDLECT1
264 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
266 @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
267 @ according to this formula:
268 @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
272 @ => 74 nop-instructions
348 * omap1610_cpu_suspend()'s resume point.
350 * It will just start executing here, so we'll restore stuff from the
353 @ Restore the ARM_IDLECT1 and ARM_IDLECT2.
354 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
355 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
357 @ Restore EMIFF controls
358 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
359 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
361 @ Restore regs and return
362 ldmfd sp!, {r0 - r12, pc}
364 ENTRY(omap1610_cpu_suspend_sz)
365 .word . - omap1610_cpu_suspend
366 #endif /* CONFIG_ARCH_OMAP16XX */