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>
46 * Forces OMAP into deep sleep state
48 * omapXXXX_cpu_suspend()
50 * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed
51 * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1
54 * Note: This code get's copied to internal SRAM at boot. When the OMAP
55 * wakes up it continues execution at the point it went to sleep.
57 * Note: Because of errata work arounds we have processor specific functions
58 * here. They are mostly the same, but slightly different.
62 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
64 ENTRY(omap7xx_cpu_suspend)
66 @ save registers on stack
67 stmfd sp!, {r0 - r12, lr}
71 mcr p15, 0, r0, c7, c10, 4
74 @ load base address of Traffic Controller
75 mov r6, #TCMIF_ASM_BASE & 0xff000000
76 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
77 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
79 @ prepare to put SDRAM into self-refresh manually
80 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
81 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
82 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
83 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
85 @ prepare to put EMIFS to Sleep
86 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
87 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
88 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
90 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
91 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
92 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
93 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
95 @ turn off clock domains
96 @ do not disable PERCK (0x04)
97 mov r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff
98 orr r5, r5, #OMAP7XX_IDLECT2_SLEEP_VAL & 0xff00
99 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
102 mov r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff
103 orr r3, r3, #OMAP7XX_IDLECT1_SLEEP_VAL & 0xff00
104 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
106 @ disable instruction cache
107 mrc p15, 0, r9, c1, c0, 0
109 mcr p15, 0, r2, c1, c0, 0
113 * Let's wait for the next wake up event to wake us up. r0 can't be
114 * used here because r0 holds ARM_IDLECT1
117 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
119 * omap7xx_cpu_suspend()'s resume point.
121 * It will just start executing here, so we'll restore stuff from the
125 mcr p15, 0, r9, c1, c0, 0
127 @ reset the ARM_IDLECT1 and ARM_IDLECT2.
128 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
129 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
131 @ Restore EMIFF controls
132 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
133 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
135 @ restore regs and return
136 ldmfd sp!, {r0 - r12, pc}
138 ENTRY(omap7xx_cpu_suspend_sz)
139 .word . - omap7xx_cpu_suspend
140 #endif /* CONFIG_ARCH_OMAP730 || CONFIG_ARCH_OMAP850 */
142 #ifdef CONFIG_ARCH_OMAP15XX
144 ENTRY(omap1510_cpu_suspend)
146 @ save registers on stack
147 stmfd sp!, {r0 - r12, lr}
149 @ load base address of Traffic Controller
150 mov r4, #TCMIF_ASM_BASE & 0xff000000
151 orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
152 orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
154 @ work around errata of OMAP1510 PDE bit for TC shut down
156 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
157 bic r5, r5, #PDE_BIT & 0xff
158 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
161 and r5, r5, #PWD_EN_BIT & 0xff
162 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
164 @ prepare to put SDRAM into self-refresh manually
165 ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
166 orr r5, r5, #SELF_REFRESH_MODE & 0xff000000
167 orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff
168 str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
170 @ prepare to put EMIFS to Sleep
171 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
172 orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff
173 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
175 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
176 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
177 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
178 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
180 @ turn off clock domains
181 mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
182 orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
183 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
186 mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
187 orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
188 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
190 mov r5, #IDLE_WAIT_CYCLES & 0xff
191 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
196 * Let's wait for the next wake up event to wake us up. r0 can't be
197 * used here because r0 holds ARM_IDLECT1
200 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
202 * omap1510_cpu_suspend()'s resume point.
204 * It will just start executing here, so we'll restore stuff from the
205 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
207 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
208 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
210 @ restore regs and return
211 ldmfd sp!, {r0 - r12, pc}
213 ENTRY(omap1510_cpu_suspend_sz)
214 .word . - omap1510_cpu_suspend
215 #endif /* CONFIG_ARCH_OMAP15XX */
217 #if defined(CONFIG_ARCH_OMAP16XX)
219 ENTRY(omap1610_cpu_suspend)
221 @ save registers on stack
222 stmfd sp!, {r0 - r12, lr}
226 mcr p15, 0, r0, c7, c10, 4
229 @ Load base address of Traffic Controller
230 mov r6, #TCMIF_ASM_BASE & 0xff000000
231 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
232 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
234 @ Prepare to put SDRAM into self-refresh manually
235 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
236 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
237 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
238 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
240 @ Prepare to put EMIFS to Sleep
241 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
242 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
243 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
245 @ Load base address of ARM_IDLECT1 and ARM_IDLECT2
246 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
247 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
248 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
250 @ Turn off clock domains
251 @ Do not disable PERCK (0x04)
252 mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
253 orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
254 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
257 mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
258 orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
259 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
262 * Let's wait for the next wake up event to wake us up. r0 can't be
263 * used here because r0 holds ARM_IDLECT1
266 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
268 @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
269 @ according to this formula:
270 @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
274 @ => 74 nop-instructions
350 * omap1610_cpu_suspend()'s resume point.
352 * It will just start executing here, so we'll restore stuff from the
355 @ Restore the ARM_IDLECT1 and ARM_IDLECT2.
356 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
357 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
359 @ Restore EMIFF controls
360 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
361 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
363 @ Restore regs and return
364 ldmfd sp!, {r0 - r12, pc}
366 ENTRY(omap1610_cpu_suspend_sz)
367 .word . - omap1610_cpu_suspend
368 #endif /* CONFIG_ARCH_OMAP16XX */