arch/arm/mach-s3c24xx/pm-s3c2412.c

   1 /* linux/arch/arm/mach-s3c2412/pm.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://armlinux.simtec.co.uk/.
   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/kernel.h>
  14 #include <linux/types.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/list.h>
  17 #include <linux/timer.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/syscore_ops.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23
  24 #include <asm/cacheflush.h>
  25 #include <asm/irq.h>
  26
  27 #include <mach/hardware.h>
  28 #include <mach/regs-gpio.h>
  29
  30 #include <plat/cpu.h>
  31 #include <plat/pm.h>
  32
  33 #include "regs-dsc.h"
  34 #include "s3c2412-power.h"
  35
  36 extern void s3c2412_sleep_enter(void);
  37
  38 static int s3c2412_cpu_suspend(unsigned long arg)
  39 {
  40         unsigned long tmp;
  41
  42         /* set our standby method to sleep */
  43
  44         tmp = __raw_readl(S3C2412_PWRCFG);
  45         tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  46         __raw_writel(tmp, S3C2412_PWRCFG);
  47
  48         s3c2412_sleep_enter();
  49
  50         pr_info("Failed to suspend the system\n");
  51         return 1; /* Aborting suspend */
  52 }
  53
  54 static void s3c2412_pm_prepare(void)
  55 {
  56 }
  57
  58 static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
  59 {
  60         pm_cpu_prep = s3c2412_pm_prepare;
  61         pm_cpu_sleep = s3c2412_cpu_suspend;
  62
  63         return 0;
  64 }
  65
  66 static struct sleep_save s3c2412_sleep[] = {
  67         SAVE_ITEM(S3C2412_DSC0),
  68         SAVE_ITEM(S3C2412_DSC1),
  69         SAVE_ITEM(S3C2413_GPJDAT),
  70         SAVE_ITEM(S3C2413_GPJCON),
  71         SAVE_ITEM(S3C2413_GPJUP),
  72
  73         /* save the PWRCFG to get back to original sleep method */
  74
  75         SAVE_ITEM(S3C2412_PWRCFG),
  76
  77         /* save the sleep configuration anyway, just in case these
  78          * get damaged during wakeup */
  79
  80         SAVE_ITEM(S3C2412_GPBSLPCON),
  81         SAVE_ITEM(S3C2412_GPCSLPCON),
  82         SAVE_ITEM(S3C2412_GPDSLPCON),
  83         SAVE_ITEM(S3C2412_GPFSLPCON),
  84         SAVE_ITEM(S3C2412_GPGSLPCON),
  85         SAVE_ITEM(S3C2412_GPHSLPCON),
  86         SAVE_ITEM(S3C2413_GPJSLPCON),
  87 };
  88
  89 static struct subsys_interface s3c2412_pm_interface = {
  90         .name           = "s3c2412_pm",
  91         .subsys         = &s3c2412_subsys,
  92         .add_dev        = s3c2412_pm_add,
  93 };
  94
  95 static __init int s3c2412_pm_init(void)
  96 {
  97         return subsys_interface_register(&s3c2412_pm_interface);
  98 }
  99
 100 arch_initcall(s3c2412_pm_init);
 101
 102 static int s3c2412_pm_suspend(void)
 103 {
 104         s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 105         return 0;
 106 }
 107
 108 static void s3c2412_pm_resume(void)
 109 {
 110         unsigned long tmp;
 111
 112         tmp = __raw_readl(S3C2412_PWRCFG);
 113         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 114         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 115         __raw_writel(tmp, S3C2412_PWRCFG);
 116
 117         s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 118 }
 119
 120 struct syscore_ops s3c2412_pm_syscore_ops = {
 121         .suspend        = s3c2412_pm_suspend,
 122         .resume         = s3c2412_pm_resume,
 123 };