arch/arm/mach-s3c24xx/pm-s3c2416.c

   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/device.h>
  14 #include <linux/syscore_ops.h>
  15 #include <linux/io.h>
  16
  17 #include <asm/cacheflush.h>
  18
  19 #include <mach/regs-s3c2443-clock.h>
  20
  21 #include <plat/cpu.h>
  22 #include <plat/pm.h>
  23
  24 #include "s3c2412-power.h"
  25
  26 #ifdef CONFIG_PM_SLEEP
  27 extern void s3c2412_sleep_enter(void);
  28
  29 static int s3c2416_cpu_suspend(unsigned long arg)
  30 {
  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();
  38
  39         pr_info("Failed to suspend the system\n");
  40         return 1; /* Aborting suspend */
  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);
  51         __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
  52 }
  53
  54 static int s3c2416_pm_add(struct device *dev, struct subsys_interface *sif)
  55 {
  56         pm_cpu_prep = s3c2416_pm_prepare;
  57         pm_cpu_sleep = s3c2416_cpu_suspend;
  58
  59         return 0;
  60 }
  61
  62 static struct subsys_interface s3c2416_pm_interface = {
  63         .name           = "s3c2416_pm",
  64         .subsys         = &s3c2416_subsys,
  65         .add_dev        = s3c2416_pm_add,
  66 };
  67
  68 static __init int s3c2416_pm_init(void)
  69 {
  70         return subsys_interface_register(&s3c2416_pm_interface);
  71 }
  72
  73 arch_initcall(s3c2416_pm_init);
  74 #endif
  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 };