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>
37 #include <asm/assembler.h>
39 #include <mach/hardware.h>
48 * Forces OMAP into deep sleep state
50 * omapXXXX_cpu_suspend()
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
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.
59 * Note: Because of errata work arounds we have processor specific functions
60 * here. They are mostly the same, but slightly different.
64 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
66 ENTRY(omap7xx_cpu_suspend)
68 @ save registers on stack
69 stmfd sp!, {r0 - r12, lr}
73 mcr p15, 0, r0, c7, c10, 4
76 @ load base address of Traffic Controller
77 mov r6, #TCMIF_ASM_BASE & 0xff000000
78 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
79 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
81 @ prepare to put SDRAM into self-refresh manually
82 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
83 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
84 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
85 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
87 @ prepare to put EMIFS to Sleep
88 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
89 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
90 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
92 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
93 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
94 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
95 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
97 @ turn off clock domains
98 @ do not disable PERCK (0x04)
99 mov r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff
100 orr r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00
101 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
104 mov r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff
105 orr r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00
106 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
108 @ disable instruction cache
109 mrc p15, 0, r9, c1, c0, 0
111 mcr p15, 0, r2, c1, c0, 0
115 * Let's wait for the next wake up event to wake us up. r0 can't be
116 * used here because r0 holds ARM_IDLECT1
119 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
121 * omap7xx_cpu_suspend()'s resume point.
123 * It will just start executing here, so we'll restore stuff from the
127 mcr p15, 0, r9, c1, c0, 0
129 @ reset the ARM_IDLECT1 and ARM_IDLECT2.
130 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
131 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
133 @ Restore EMIFF controls
134 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
135 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
137 @ restore regs and return
138 ldmfd sp!, {r0 - r12, pc}
140 ENTRY(omap7xx_cpu_suspend_sz)
141 .word . - omap7xx_cpu_suspend
142 #endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
144 #ifdef CONFIG_ARCH_OMAP15XX
146 ENTRY(omap1510_cpu_suspend)
148 @ save registers on stack
149 stmfd sp!, {r0 - r12, lr}
151 @ load base address of Traffic Controller
152 mov r4, #TCMIF_ASM_BASE & 0xff000000
153 orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
154 orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
156 @ work around errata of OMAP1510 PDE bit for TC shut down
158 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
159 bic r5, r5, #PDE_BIT & 0xff
160 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
163 and r5, r5, #PWD_EN_BIT & 0xff
164 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
166 @ prepare to put SDRAM into self-refresh manually
167 ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
168 orr r5, r5, #SELF_REFRESH_MODE & 0xff000000
169 orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff
170 str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
172 @ prepare to put EMIFS to Sleep
173 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
174 orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff
175 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
177 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
178 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
179 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
180 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
182 @ turn off clock domains
183 mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
184 orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
185 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
188 mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
189 orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
190 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
192 mov r5, #IDLE_WAIT_CYCLES & 0xff
193 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
198 * Let's wait for the next wake up event to wake us up. r0 can't be
199 * used here because r0 holds ARM_IDLECT1
202 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
204 * omap1510_cpu_suspend()'s resume point.
206 * It will just start executing here, so we'll restore stuff from the
207 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
209 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
210 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
212 @ restore regs and return
213 ldmfd sp!, {r0 - r12, pc}
215 ENTRY(omap1510_cpu_suspend_sz)
216 .word . - omap1510_cpu_suspend
217 #endif /* CONFIG_ARCH_OMAP15XX */
219 #if defined(CONFIG_ARCH_OMAP16XX)
221 ENTRY(omap1610_cpu_suspend)
223 @ save registers on stack
224 stmfd sp!, {r0 - r12, lr}
228 mcr p15, 0, r0, c7, c10, 4
231 @ Load base address of Traffic Controller
232 mov r6, #TCMIF_ASM_BASE & 0xff000000
233 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
234 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
236 @ Prepare to put SDRAM into self-refresh manually
237 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
238 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
239 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
240 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
242 @ Prepare to put EMIFS to Sleep
243 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
244 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
245 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
247 @ Load base address of ARM_IDLECT1 and ARM_IDLECT2
248 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
249 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
250 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
252 @ Turn off clock domains
253 @ Do not disable PERCK (0x04)
254 mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
255 orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
256 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
259 mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
260 orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
261 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
264 * Let's wait for the next wake up event to wake us up. r0 can't be
265 * used here because r0 holds ARM_IDLECT1
268 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
270 @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
271 @ according to this formula:
272 @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
276 @ => 74 nop-instructions
352 * omap1610_cpu_suspend()'s resume point.
354 * It will just start executing here, so we'll restore stuff from the
357 @ Restore the ARM_IDLECT1 and ARM_IDLECT2.
358 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
359 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
361 @ Restore EMIFF controls
362 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
363 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
365 @ Restore regs and return
366 ldmfd sp!, {r0 - r12, pc}
368 ENTRY(omap1610_cpu_suspend_sz)
369 .word . - omap1610_cpu_suspend
370 #endif /* CONFIG_ARCH_OMAP16XX */