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58862699 | 1 | /* linux/arch/arm/plat-s3c24xx/sleep.S |
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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> | |
334a1c70 | 28 | #include <linux/serial_s3c.h> |
a21765a7 | 29 | #include <asm/assembler.h> |
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30 | #include <mach/hardware.h> |
31 | #include <mach/map.h> | |
a21765a7 | 32 | |
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33 | #include <mach/regs-gpio.h> |
34 | #include <mach/regs-clock.h> | |
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35 | |
36 | /* CONFIG_DEBUG_RESUME is dangerous if your bootloader does not | |
37 | * reset the UART configuration, only enable if you really need this! | |
38 | */ | |
39 | //#define CONFIG_DEBUG_RESUME | |
40 | ||
41 | .text | |
42 | ||
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43 | /* sleep magic, to allow the bootloader to check for an valid |
44 | * image to resume to. Must be the first word before the | |
ef30e144 | 45 | * s3c_cpu_resume entry. |
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46 | */ |
47 | ||
48 | .word 0x2bedf00d | |
49 | ||
ef30e144 | 50 | /* s3c_cpu_resume |
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51 | * |
52 | * resume code entry for bootloader to call | |
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53 | */ |
54 | ||
ef30e144 | 55 | ENTRY(s3c_cpu_resume) |
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56 | mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE |
57 | msr cpsr_c, r0 | |
58 | ||
59 | @@ load UART to allow us to print the two characters for | |
60 | @@ resume debug | |
61 | ||
62 | mov r2, #S3C24XX_PA_UART & 0xff000000 | |
63 | orr r2, r2, #S3C24XX_PA_UART & 0xff000 | |
64 | ||
65 | #if 0 | |
66 | /* SMDK2440 LED set */ | |
67 | mov r14, #S3C24XX_PA_GPIO | |
68 | ldr r12, [ r14, #0x54 ] | |
69 | bic r12, r12, #3<<4 | |
70 | orr r12, r12, #1<<7 | |
71 | str r12, [ r14, #0x54 ] | |
72 | #endif | |
73 | ||
74 | #ifdef CONFIG_DEBUG_RESUME | |
75 | mov r3, #'L' | |
76 | strb r3, [ r2, #S3C2410_UTXH ] | |
77 | 1001: | |
78 | ldrb r14, [ r3, #S3C2410_UTRSTAT ] | |
79 | tst r14, #S3C2410_UTRSTAT_TXE | |
80 | beq 1001b | |
81 | #endif /* CONFIG_DEBUG_RESUME */ | |
82 | ||
2e2f3d37 | 83 | b cpu_resume |