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 | |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 13 | #include <linux/device.h> |
Rafael J. Wysocki | bb072c3 | 2011-04-22 22:03:21 +0200 | [diff] [blame] | 14 | #include <linux/syscore_ops.h> |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 15 | #include <linux/io.h> |
| 16 | |
| 17 | #include <asm/cacheflush.h> |
| 18 | |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 19 | #include <mach/regs-s3c2443-clock.h> |
| 20 | |
| 21 | #include <plat/cpu.h> |
| 22 | #include <plat/pm.h> |
| 23 | |
Kukjin Kim | 14cce0e | 2013-02-01 21:49:35 -0800 | [diff] [blame] | 24 | #include "s3c2412-power.h" |
| 25 | |
Arnd Bergmann | 4f506da | 2015-02-27 05:50:22 +0900 | [diff] [blame] | 26 | #ifdef CONFIG_PM_SLEEP |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 27 | extern void s3c2412_sleep_enter(void); |
| 28 | |
Russell King | 29cb3cd | 2011-07-02 09:54:01 +0100 | [diff] [blame] | 29 | static int s3c2416_cpu_suspend(unsigned long arg) |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 30 | { |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 31 | /* enable wakeup sources regardless of battery state */ |
| 32 | __raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG); |
| 33 | |
| 34 | /* set the mode as sleep, 2BED represents "Go to BED" */ |
| 35 | __raw_writel(0x2BED, S3C2443_PWRMODE); |
| 36 | |
| 37 | s3c2412_sleep_enter(); |
Russell King | 29cb3cd | 2011-07-02 09:54:01 +0100 | [diff] [blame] | 38 | |
Abhilash Kesavan | d3fcacf | 2013-01-25 10:40:19 -0800 | [diff] [blame] | 39 | pr_info("Failed to suspend the system\n"); |
| 40 | return 1; /* Aborting suspend */ |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 41 | } |
| 42 | |
| 43 | static void s3c2416_pm_prepare(void) |
| 44 | { |
| 45 | /* |
| 46 | * write the magic value u-boot uses to check for resume into |
| 47 | * the INFORM0 register, and ensure INFORM1 is set to the |
| 48 | * correct address to resume from. |
| 49 | */ |
| 50 | __raw_writel(0x2BED, S3C2412_INFORM0); |
Florian Fainelli | 64fc2a9 | 2017-01-15 03:59:29 +0100 | [diff] [blame] | 51 | __raw_writel(__pa_symbol(s3c_cpu_resume), S3C2412_INFORM1); |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 52 | } |
| 53 | |
Heiko Stuebner | 04511a6 | 2012-01-27 15:35:25 +0900 | [diff] [blame] | 54 | static int s3c2416_pm_add(struct device *dev, struct subsys_interface *sif) |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 55 | { |
| 56 | pm_cpu_prep = s3c2416_pm_prepare; |
| 57 | pm_cpu_sleep = s3c2416_cpu_suspend; |
| 58 | |
| 59 | return 0; |
| 60 | } |
| 61 | |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 62 | static struct subsys_interface s3c2416_pm_interface = { |
| 63 | .name = "s3c2416_pm", |
| 64 | .subsys = &s3c2416_subsys, |
| 65 | .add_dev = s3c2416_pm_add, |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 66 | }; |
| 67 | |
| 68 | static __init int s3c2416_pm_init(void) |
| 69 | { |
Kay Sievers | 4a858cf | 2011-12-21 16:01:38 -0800 | [diff] [blame] | 70 | return subsys_interface_register(&s3c2416_pm_interface); |
Abhilash Kesavan | 6436b6a | 2010-10-20 19:43:35 +0900 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | arch_initcall(s3c2416_pm_init); |
Arnd Bergmann | 4f506da | 2015-02-27 05:50:22 +0900 | [diff] [blame] | 74 | #endif |
Rafael J. Wysocki | bb072c3 | 2011-04-22 22:03:21 +0200 | [diff] [blame] | 75 | |
| 76 | static void s3c2416_pm_resume(void) |
| 77 | { |
| 78 | /* unset the return-from-sleep amd inform flags */ |
| 79 | __raw_writel(0x0, S3C2443_PWRMODE); |
| 80 | __raw_writel(0x0, S3C2412_INFORM0); |
| 81 | __raw_writel(0x0, S3C2412_INFORM1); |
| 82 | } |
| 83 | |
| 84 | struct syscore_ops s3c2416_pm_syscore_ops = { |
| 85 | .resume = s3c2416_pm_resume, |
| 86 | }; |