| Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 1 | /* linux/arch/arm/mach-s3c2416/pm.c |
| 2 | * |
| 3 | * Copyright (c) 2010 Samsung Electronics Co., Ltd. |
| 4 | * http://www.samsung.com |
| 5 | * |
| 6 | * S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support) |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/sysdev.h> |
| 14 | #include <linux/io.h> |
| 15 | |
| 16 | #include <asm/cacheflush.h> |
| 17 | |
| 18 | #include <mach/regs-power.h> |
| 19 | #include <mach/regs-s3c2443-clock.h> |
| 20 | |
| 21 | #include <plat/cpu.h> |
| 22 | #include <plat/pm.h> |
| 23 | |
| 24 | extern void s3c2412_sleep_enter(void); |
| 25 | |
| 26 | static void s3c2416_cpu_suspend(void) |
| 27 | { |
| 28 | flush_cache_all(); |
| 29 | |
| 30 | /* enable wakeup sources regardless of battery state */ |
| 31 | __raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG); |
| 32 | |
| 33 | /* set the mode as sleep, 2BED represents "Go to BED" */ |
| 34 | __raw_writel(0x2BED, S3C2443_PWRMODE); |
| 35 | |
| 36 | s3c2412_sleep_enter(); |
| 37 | } |
| 38 | |
| 39 | static void s3c2416_pm_prepare(void) |
| 40 | { |
| 41 | /* |
| 42 | * write the magic value u-boot uses to check for resume into |
| 43 | * the INFORM0 register, and ensure INFORM1 is set to the |
| 44 | * correct address to resume from. |
| 45 | */ |
| 46 | __raw_writel(0x2BED, S3C2412_INFORM0); |
| 47 | __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1); |
| 48 | } |
| 49 | |
| 50 | static int s3c2416_pm_add(struct sys_device *sysdev) |
| 51 | { |
| 52 | pm_cpu_prep = s3c2416_pm_prepare; |
| 53 | pm_cpu_sleep = s3c2416_cpu_suspend; |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state) |
| 59 | { |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int s3c2416_pm_resume(struct sys_device *dev) |
| 64 | { |
| 65 | /* unset the return-from-sleep amd inform flags */ |
| 66 | __raw_writel(0x0, S3C2443_PWRMODE); |
| 67 | __raw_writel(0x0, S3C2412_INFORM0); |
| 68 | __raw_writel(0x0, S3C2412_INFORM1); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static struct sysdev_driver s3c2416_pm_driver = { |
| 74 | .add = s3c2416_pm_add, |
| 75 | .suspend = s3c2416_pm_suspend, |
| 76 | .resume = s3c2416_pm_resume, |
| 77 | }; |
| 78 | |
| 79 | static __init int s3c2416_pm_init(void) |
| 80 | { |
| 81 | return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver); |
| 82 | } |
| 83 | |
| 84 | arch_initcall(s3c2416_pm_init); |