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gerrit-public.fairphone.software / kernel / msm-4.9 / a0b3447fb1d8b32071f473c779a482277816867a / . / arch / arm / plat-s3c24xx / sleep.S
blob: c56612569b40e315a096ed6eea40aa09e477d107 [file] [log] [blame]
Uwe Kleine-König58862692007-05-09 07:51:49 +0200[diff] [blame]1/* linux/arch/arm/plat-s3c24xx/sleep.S
Ben Dooksa21765a2007-02-11 18:31:01 +0100[diff] [blame]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>
Russell Kinga09e64f2008-08-05 16:14:15 +0100[diff] [blame]29#include <mach/hardware.h>
30#include <mach/map.h>
Ben Dooksa21765a2007-02-11 18:31:01 +0100[diff] [blame]31
Russell Kinga09e64f2008-08-05 16:14:15 +0100[diff] [blame]32#include <mach/regs-gpio.h>
33#include <mach/regs-clock.h>
34#include <mach/regs-mem.h>
Ben Dooksa2b7ba92008-10-07 22:26:09 +0100[diff] [blame]35#include <plat/regs-serial.h>
Ben Dooksa21765a2007-02-11 18:31:01 +0100[diff] [blame]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
Ben Dooks6c729af2007-09-30 09:59:15 +0100[diff] [blame]44 /* sleep magic, to allow the bootloader to check for an valid
45 * image to resume to. Must be the first word before the
Ben Dooksef30e142008-12-12 00:24:19 +0000[diff] [blame]46 * s3c_cpu_resume entry.
Ben Dooks6c729af2007-09-30 09:59:15 +0100[diff] [blame]47 */
48
49 .word 0x2bedf00d
50
Ben Dooksef30e142008-12-12 00:24:19 +0000[diff] [blame]51 /* s3c_cpu_resume
Ben Dooksa21765a2007-02-11 18:31:01 +0100[diff] [blame]52 *
53 * resume code entry for bootloader to call
Ben Dooksa21765a2007-02-11 18:31:01 +0100[diff] [blame]54 */
55
Ben Dooksef30e142008-12-12 00:24:19 +0000[diff] [blame]56ENTRY(s3c_cpu_resume)
Ben Dooksa21765a2007-02-11 18:31:01 +0100[diff] [blame]57 mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
58 msr cpsr_c, r0
59
60 @@ load UART to allow us to print the two characters for
61 @@ resume debug
62
63 mov r2, #S3C24XX_PA_UART & 0xff000000
64 orr r2, r2, #S3C24XX_PA_UART & 0xff000
65
66#if 0
67 /* SMDK2440 LED set */
68 mov r14, #S3C24XX_PA_GPIO
69 ldr r12, [ r14, #0x54 ]
70 bic r12, r12, #3<<4
71 orr r12, r12, #1<<7
72 str r12, [ r14, #0x54 ]
73#endif
74
75#ifdef CONFIG_DEBUG_RESUME
76 mov r3, #'L'
77 strb r3, [ r2, #S3C2410_UTXH ]
781001:
79 ldrb r14, [ r3, #S3C2410_UTRSTAT ]
80 tst r14, #S3C2410_UTRSTAT_TXE
81 beq 1001b
82#endif /* CONFIG_DEBUG_RESUME */
83
Russell King2e2f3d32011-02-06 17:39:31 +0000[diff] [blame]84 b cpu_resume