projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 58862699 | 1 | /* linux/arch/arm/plat-s3c24xx/sleep.S |
| a21765a7 BD |
2 | * |
| 3 | * Copyright (c) 2004 Simtec Electronics | |
| 4 | * Ben Dooks <ben@simtec.co.uk> | |
| 5 | * | |
| 6 | * S3C2410 Power Manager (Suspend-To-RAM) support | |
| 7 | * | |
| 8 | * Based on PXA/SA1100 sleep code by: | |
| 9 | * Nicolas Pitre, (c) 2002 Monta Vista Software Inc | |
| 10 | * Cliff Brake, (c) 2001 | |
| 11 | * | |
| 12 | * This program is free software; you can redistribute it and/or modify | |
| 13 | * it under the terms of the GNU General Public License as published by | |
| 14 | * the Free Software Foundation; either version 2 of the License, or | |
| 15 | * (at your option) any later version. | |
| 16 | * | |
| 17 | * This program is distributed in the hope that it will be useful, | |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 20 | * GNU General Public License for more details. | |
| 21 | * | |
| 22 | * You should have received a copy of the GNU General Public License | |
| 23 | * along with this program; if not, write to the Free Software | |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 25 | */ | |
| 26 | ||
| 27 | #include <linux/linkage.h> | |
| 28 | #include <asm/assembler.h> | |
| a09e64fb RK |
29 | #include <mach/hardware.h> |
| 30 | #include <mach/map.h> | |
| a21765a7 | 31 | |
| a09e64fb RK |
32 | #include <mach/regs-gpio.h> |
| 33 | #include <mach/regs-clock.h> | |
| 34 | #include <mach/regs-mem.h> | |
| a2b7ba9c | 35 | #include <plat/regs-serial.h> |
| a21765a7 BD |
36 | |
| 37 | /* CONFIG_DEBUG_RESUME is dangerous if your bootloader does not | |
| 38 | * reset the UART configuration, only enable if you really need this! | |
| 39 | */ | |
| 40 | //#define CONFIG_DEBUG_RESUME | |
| 41 | ||
| 42 | .text | |
| 43 | ||
| ef30e144 | 44 | /* s3c_cpu_save |
| a21765a7 BD |
45 | * |
| 46 | * entry: | |
| 2e2f3d37 | 47 | * r1 = v:p offset |
| a21765a7 BD |
48 | */ |
| 49 | ||
| ef30e144 | 50 | ENTRY(s3c_cpu_save) |
| a21765a7 | 51 | stmfd sp!, { r4 - r12, lr } |
| 2e2f3d37 RK |
52 | ldr r3, =resume_with_mmu |
| 53 | bl cpu_suspend | |
| a21765a7 | 54 | |
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55 | @@ jump to final code to send system to sleep |
| 56 | ldr r0, =pm_cpu_sleep | |
| 57 | @@ldr pc, [ r0 ] | |
| 58 | ldr r0, [ r0 ] | |
| 59 | mov pc, r0 | |
| 60 | ||
| a21765a7 BD |
61 | @@ return to the caller, after having the MMU |
| 62 | @@ turned on, this restores the last bits from the | |
| 63 | @@ stack | |
| 64 | resume_with_mmu: | |
| a21765a7 BD |
65 | ldmfd sp!, { r4 - r12, pc } |
| 66 | ||
| 67 | .ltorg | |
| 68 | ||
| 6c729af9 BD |
69 | /* sleep magic, to allow the bootloader to check for an valid |
| 70 | * image to resume to. Must be the first word before the | |
| ef30e144 | 71 | * s3c_cpu_resume entry. |
| 6c729af9 BD |
72 | */ |
| 73 | ||
| 74 | .word 0x2bedf00d | |
| 75 | ||
| ef30e144 | 76 | /* s3c_cpu_resume |
| a21765a7 BD |
77 | * |
| 78 | * resume code entry for bootloader to call | |
| a21765a7 BD |
79 | */ |
| 80 | ||
| ef30e144 | 81 | ENTRY(s3c_cpu_resume) |
| a21765a7 BD |
82 | mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE |
| 83 | msr cpsr_c, r0 | |
| 84 | ||
| 85 | @@ load UART to allow us to print the two characters for | |
| 86 | @@ resume debug | |
| 87 | ||
| 88 | mov r2, #S3C24XX_PA_UART & 0xff000000 | |
| 89 | orr r2, r2, #S3C24XX_PA_UART & 0xff000 | |
| 90 | ||
| 91 | #if 0 | |
| 92 | /* SMDK2440 LED set */ | |
| 93 | mov r14, #S3C24XX_PA_GPIO | |
| 94 | ldr r12, [ r14, #0x54 ] | |
| 95 | bic r12, r12, #3<<4 | |
| 96 | orr r12, r12, #1<<7 | |
| 97 | str r12, [ r14, #0x54 ] | |
| 98 | #endif | |
| 99 | ||
| 100 | #ifdef CONFIG_DEBUG_RESUME | |
| 101 | mov r3, #'L' | |
| 102 | strb r3, [ r2, #S3C2410_UTXH ] | |
| 103 | 1001: | |
| 104 | ldrb r14, [ r3, #S3C2410_UTRSTAT ] | |
| 105 | tst r14, #S3C2410_UTRSTAT_TXE | |
| 106 | beq 1001b | |
| 107 | #endif /* CONFIG_DEBUG_RESUME */ | |
| 108 | ||
| 2e2f3d37 | 109 | b cpu_resume |