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Diffstat (limited to 'arch/arm/plat-omap/sleep.S')
| -rw-r--r-- | arch/arm/plat-omap/sleep.S | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/sleep.S b/arch/arm/plat-omap/sleep.S new file mode 100644 index 000000000000..279490ce772b --- /dev/null +++ b/arch/arm/plat-omap/sleep.S | |||
| @@ -0,0 +1,314 @@ | |||
| 1 | /* | ||
| 2 | * linux/arch/arm/plat-omap/sleep.S | ||
| 3 | * | ||
| 4 | * Low-level OMAP1510/1610 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/config.h> | ||
| 36 | #include <linux/linkage.h> | ||
| 37 | #include <asm/assembler.h> | ||
| 38 | #include <asm/arch/io.h> | ||
| 39 | #include <asm/arch/pm.h> | ||
| 40 | |||
| 41 | .text | ||
| 42 | |||
| 43 | /* | ||
| 44 | * Forces OMAP into idle state | ||
| 45 | * | ||
| 46 | * omapXXXX_idle_loop_suspend() | ||
| 47 | * | ||
| 48 | * Note: This code get's copied to internal SRAM at boot. When the OMAP | ||
| 49 | * wakes up it continues execution at the point it went to sleep. | ||
| 50 | * | ||
| 51 | * Note: Because of slightly different configuration values we have | ||
| 52 | * processor specific functions here. | ||
| 53 | */ | ||
| 54 | |||
| 55 | #ifdef CONFIG_ARCH_OMAP1510 | ||
| 56 | ENTRY(omap1510_idle_loop_suspend) | ||
| 57 | |||
| 58 | stmfd sp!, {r0 - r12, lr} @ save registers on stack | ||
| 59 | |||
| 60 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
| 61 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
| 62 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
| 63 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
| 64 | |||
| 65 | @ turn off clock domains | ||
| 66 | @ get ARM_IDLECT2 into r2 | ||
| 67 | ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 68 | mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff | ||
| 69 | orr r5,r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00 | ||
| 70 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 71 | |||
| 72 | @ request ARM idle | ||
| 73 | @ get ARM_IDLECT1 into r1 | ||
| 74 | ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 75 | orr r3, r1, #OMAP1510_IDLE_LOOP_REQUEST & 0xffff | ||
| 76 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 77 | |||
| 78 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
| 79 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
| 80 | l_1510: subs r5, r5, #1 | ||
| 81 | bne l_1510 | ||
| 82 | /* | ||
| 83 | * Let's wait for the next clock tick to wake us up. | ||
| 84 | */ | ||
| 85 | mov r0, #0 | ||
| 86 | mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt | ||
| 87 | /* | ||
| 88 | * omap1510_idle_loop_suspend()'s resume point. | ||
| 89 | * | ||
| 90 | * It will just start executing here, so we'll restore stuff from the | ||
| 91 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
| 92 | */ | ||
| 93 | |||
| 94 | @ restore ARM_IDLECT1 and ARM_IDLECT2 and return | ||
| 95 | @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2 | ||
| 96 | strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 97 | strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 98 | |||
| 99 | ldmfd sp!, {r0 - r12, pc} @ restore regs and return | ||
| 100 | |||
| 101 | ENTRY(omap1510_idle_loop_suspend_sz) | ||
| 102 | .word . - omap1510_idle_loop_suspend | ||
| 103 | #endif /* CONFIG_ARCH_OMAP1510 */ | ||
| 104 | |||
| 105 | #if defined(CONFIG_ARCH_OMAP16XX) | ||
| 106 | ENTRY(omap1610_idle_loop_suspend) | ||
| 107 | |||
| 108 | stmfd sp!, {r0 - r12, lr} @ save registers on stack | ||
| 109 | |||
| 110 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
| 111 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
| 112 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
| 113 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
| 114 | |||
| 115 | @ turn off clock domains | ||
| 116 | @ get ARM_IDLECT2 into r2 | ||
| 117 | ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 118 | mov r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff | ||
| 119 | orr r5,r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff00 | ||
| 120 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 121 | |||
| 122 | @ request ARM idle | ||
| 123 | @ get ARM_IDLECT1 into r1 | ||
| 124 | ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 125 | orr r3, r1, #OMAP1610_IDLE_LOOP_REQUEST & 0xffff | ||
| 126 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 127 | |||
| 128 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
| 129 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
| 130 | l_1610: subs r5, r5, #1 | ||
| 131 | bne l_1610 | ||
| 132 | /* | ||
| 133 | * Let's wait for the next clock tick to wake us up. | ||
| 134 | */ | ||
| 135 | mov r0, #0 | ||
| 136 | mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt | ||
| 137 | /* | ||
| 138 | * omap1610_idle_loop_suspend()'s resume point. | ||
| 139 | * | ||
| 140 | * It will just start executing here, so we'll restore stuff from the | ||
| 141 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
| 142 | */ | ||
| 143 | |||
| 144 | @ restore ARM_IDLECT1 and ARM_IDLECT2 and return | ||
| 145 | @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2 | ||
| 146 | strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 147 | strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 148 | |||
| 149 | ldmfd sp!, {r0 - r12, pc} @ restore regs and return | ||
| 150 | |||
| 151 | ENTRY(omap1610_idle_loop_suspend_sz) | ||
| 152 | .word . - omap1610_idle_loop_suspend | ||
| 153 | #endif /* CONFIG_ARCH_OMAP16XX */ | ||
| 154 | |||
| 155 | /* | ||
| 156 | * Forces OMAP into deep sleep state | ||
| 157 | * | ||
| 158 | * omapXXXX_cpu_suspend() | ||
| 159 | * | ||
| 160 | * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed | ||
| 161 | * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1 | ||
| 162 | * in register r1. | ||
| 163 | * | ||
| 164 | * Note: This code get's copied to internal SRAM at boot. When the OMAP | ||
| 165 | * wakes up it continues execution at the point it went to sleep. | ||
| 166 | * | ||
| 167 | * Note: Because of errata work arounds we have processor specific functions | ||
| 168 | * here. They are mostly the same, but slightly different. | ||
| 169 | * | ||
| 170 | */ | ||
| 171 | |||
| 172 | #ifdef CONFIG_ARCH_OMAP1510 | ||
| 173 | ENTRY(omap1510_cpu_suspend) | ||
| 174 | |||
| 175 | @ save registers on stack | ||
| 176 | stmfd sp!, {r0 - r12, lr} | ||
| 177 | |||
| 178 | @ load base address of Traffic Controller | ||
| 179 | mov r4, #TCMIF_ASM_BASE & 0xff000000 | ||
| 180 | orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000 | ||
| 181 | orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00 | ||
| 182 | |||
| 183 | @ work around errata of OMAP1510 PDE bit for TC shut down | ||
| 184 | @ clear PDE bit | ||
| 185 | ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 186 | bic r5, r5, #PDE_BIT & 0xff | ||
| 187 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 188 | |||
| 189 | @ set PWD_EN bit | ||
| 190 | and r5, r5, #PWD_EN_BIT & 0xff | ||
| 191 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 192 | |||
| 193 | @ prepare to put SDRAM into self-refresh manually | ||
| 194 | ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
| 195 | orr r5, r5, #SELF_REFRESH_MODE & 0xff000000 | ||
| 196 | orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff | ||
| 197 | str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
| 198 | |||
| 199 | @ prepare to put EMIFS to Sleep | ||
| 200 | ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 201 | orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff | ||
| 202 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 203 | |||
| 204 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
| 205 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
| 206 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
| 207 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
| 208 | |||
| 209 | @ turn off clock domains | ||
| 210 | mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff | ||
| 211 | orr r5,r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00 | ||
| 212 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 213 | |||
| 214 | @ request ARM idle | ||
| 215 | mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff | ||
| 216 | orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00 | ||
| 217 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 218 | |||
| 219 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
| 220 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
| 221 | l_1510_2: | ||
| 222 | subs r5, r5, #1 | ||
| 223 | bne l_1510_2 | ||
| 224 | /* | ||
| 225 | * Let's wait for the next wake up event to wake us up. r0 can't be | ||
| 226 | * used here because r0 holds ARM_IDLECT1 | ||
| 227 | */ | ||
| 228 | mov r2, #0 | ||
| 229 | mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt | ||
| 230 | /* | ||
| 231 | * omap1510_cpu_suspend()'s resume point. | ||
| 232 | * | ||
| 233 | * It will just start executing here, so we'll restore stuff from the | ||
| 234 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
| 235 | */ | ||
| 236 | strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 237 | strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 238 | |||
| 239 | @ restore regs and return | ||
| 240 | ldmfd sp!, {r0 - r12, pc} | ||
| 241 | |||
| 242 | ENTRY(omap1510_cpu_suspend_sz) | ||
| 243 | .word . - omap1510_cpu_suspend | ||
| 244 | #endif /* CONFIG_ARCH_OMAP1510 */ | ||
| 245 | |||
| 246 | #if defined(CONFIG_ARCH_OMAP16XX) | ||
| 247 | ENTRY(omap1610_cpu_suspend) | ||
| 248 | |||
| 249 | @ save registers on stack | ||
| 250 | stmfd sp!, {r0 - r12, lr} | ||
| 251 | |||
| 252 | @ load base address of Traffic Controller | ||
| 253 | mov r4, #TCMIF_ASM_BASE & 0xff000000 | ||
| 254 | orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000 | ||
| 255 | orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00 | ||
| 256 | |||
| 257 | @ prepare to put SDRAM into self-refresh manually | ||
| 258 | ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
| 259 | orr r5, r5, #SELF_REFRESH_MODE & 0xff000000 | ||
| 260 | orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff | ||
| 261 | str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff] | ||
| 262 | |||
| 263 | @ prepare to put EMIFS to Sleep | ||
| 264 | ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 265 | orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff | ||
| 266 | str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff] | ||
| 267 | |||
| 268 | @ load base address of ARM_IDLECT1 and ARM_IDLECT2 | ||
| 269 | mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000 | ||
| 270 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000 | ||
| 271 | orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00 | ||
| 272 | |||
| 273 | @ turn off clock domains | ||
| 274 | mov r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff | ||
| 275 | orr r5,r5, #OMAP1610_IDLE_CLOCK_DOMAINS & 0xff00 | ||
| 276 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 277 | |||
| 278 | @ work around errata of OMAP1610/5912. Enable (!) peripheral | ||
| 279 | @ clock to let the chip go into deep sleep | ||
| 280 | ldrh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 281 | orr r5,r5, #EN_PERCK_BIT & 0xff | ||
| 282 | strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 283 | |||
| 284 | @ request ARM idle | ||
| 285 | mov r3, #OMAP1610_DEEP_SLEEP_REQUEST & 0xff | ||
| 286 | orr r3, r3, #OMAP1610_DEEP_SLEEP_REQUEST & 0xff00 | ||
| 287 | strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 288 | |||
| 289 | mov r5, #IDLE_WAIT_CYCLES & 0xff | ||
| 290 | orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00 | ||
| 291 | l_1610_2: | ||
| 292 | subs r5, r5, #1 | ||
| 293 | bne l_1610_2 | ||
| 294 | /* | ||
| 295 | * Let's wait for the next wake up event to wake us up. r0 can't be | ||
| 296 | * used here because r0 holds ARM_IDLECT1 | ||
| 297 | */ | ||
| 298 | mov r2, #0 | ||
| 299 | mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt | ||
| 300 | /* | ||
| 301 | * omap1610_cpu_suspend()'s resume point. | ||
| 302 | * | ||
| 303 | * It will just start executing here, so we'll restore stuff from the | ||
| 304 | * stack, reset the ARM_IDLECT1 and ARM_IDLECT2. | ||
| 305 | */ | ||
| 306 | strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff] | ||
| 307 | strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff] | ||
| 308 | |||
| 309 | @ restore regs and return | ||
| 310 | ldmfd sp!, {r0 - r12, pc} | ||
| 311 | |||
| 312 | ENTRY(omap1610_cpu_suspend_sz) | ||
| 313 | .word . - omap1610_cpu_suspend | ||
| 314 | #endif /* CONFIG_ARCH_OMAP16XX */ | ||
