arch/arm/mach-s3c2412/pm.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/sysdev.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/io.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/irq.h>
  25
  26 #include <mach/regs-power.h>
  27 #include <mach/regs-gpioj.h>
  28 #include <mach/regs-gpio.h>
  29 #include <mach/regs-dsc.h>
  30
  31 #include <plat/cpu.h>
  32 #include <plat/pm.h>
  33
  34 #include <plat/s3c2412.h>
  35
  36 extern void s3c2412_sleep_enter(void);
  37
  38 static void s3c2412_cpu_suspend(void)
  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
  51 static void s3c2412_pm_prepare(void)
  52 {
  53 }
  54
  55 static int s3c2412_pm_add(struct sys_device *sysdev)
  56 {
  57         pm_cpu_prep = s3c2412_pm_prepare;
  58         pm_cpu_sleep = s3c2412_cpu_suspend;
  59
  60         return 0;
  61 }
  62
  63 static struct sleep_save s3c2412_sleep[] = {
  64         SAVE_ITEM(S3C2412_DSC0),
  65         SAVE_ITEM(S3C2412_DSC1),
  66         SAVE_ITEM(S3C2413_GPJDAT),
  67         SAVE_ITEM(S3C2413_GPJCON),
  68         SAVE_ITEM(S3C2413_GPJUP),
  69
  70         /* save the PWRCFG to get back to original sleep method */
  71
  72         SAVE_ITEM(S3C2412_PWRCFG),
  73
  74         /* save the sleep configuration anyway, just in case these
  75          * get damaged during wakeup */
  76
  77         SAVE_ITEM(S3C2412_GPBSLPCON),
  78         SAVE_ITEM(S3C2412_GPCSLPCON),
  79         SAVE_ITEM(S3C2412_GPDSLPCON),
  80         SAVE_ITEM(S3C2412_GPFSLPCON),
  81         SAVE_ITEM(S3C2412_GPGSLPCON),
  82         SAVE_ITEM(S3C2412_GPHSLPCON),
  83         SAVE_ITEM(S3C2413_GPJSLPCON),
  84 };
  85
  86 static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
  87 {
  88         s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
  89         return 0;
  90 }
  91
  92 static int s3c2412_pm_resume(struct sys_device *dev)
  93 {
  94         unsigned long tmp;
  95
  96         tmp = __raw_readl(S3C2412_PWRCFG);
  97         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
  98         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
  99         __raw_writel(tmp, S3C2412_PWRCFG);
 100
 101         s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 102         return 0;
 103 }
 104
 105 static struct sysdev_driver s3c2412_pm_driver = {
 106         .add            = s3c2412_pm_add,
 107         .suspend        = s3c2412_pm_suspend,
 108         .resume         = s3c2412_pm_resume,
 109 };
 110
 111 static __init int s3c2412_pm_init(void)
 112 {
 113         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
 114 }
 115
 116 arch_initcall(s3c2412_pm_init);