release/src-rt-6.x.4708/linux/linux-2.6.36/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/cacheflush.h>
  25 #include <asm/irq.h>
  26
  27 #include <mach/regs-power.h>
  28 #include <mach/regs-gpioj.h>
  29 #include <mach/regs-gpio.h>
  30 #include <mach/regs-dsc.h>
  31
  32 #include <plat/cpu.h>
  33 #include <plat/pm.h>
  34
  35 #include <plat/s3c2412.h>
  36
  37 extern void s3c2412_sleep_enter(void);
  38
  39 static void s3c2412_cpu_suspend(void)
  40 {
  41         unsigned long tmp;
  42
  43         flush_cache_all();
  44
  45         /* set our standby method to sleep */
  46
  47         tmp = __raw_readl(S3C2412_PWRCFG);
  48         tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  49         __raw_writel(tmp, S3C2412_PWRCFG);
  50
  51         s3c2412_sleep_enter();
  52 }
  53
  54 static void s3c2412_pm_prepare(void)
  55 {
  56 }
  57
  58 static int s3c2412_pm_add(struct sys_device *sysdev)
  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 int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
  90 {
  91         s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
  92         return 0;
  93 }
  94
  95 static int s3c2412_pm_resume(struct sys_device *dev)
  96 {
  97         unsigned long tmp;
  98
  99         tmp = __raw_readl(S3C2412_PWRCFG);
 100         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 101         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 102         __raw_writel(tmp, S3C2412_PWRCFG);
 103
 104         s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 105         return 0;
 106 }
 107
 108 static struct sysdev_driver s3c2412_pm_driver = {
 109         .add            = s3c2412_pm_add,
 110         .suspend        = s3c2412_pm_suspend,
 111         .resume         = s3c2412_pm_resume,
 112 };
 113
 114 static __init int s3c2412_pm_init(void)
 115 {
 116         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
 117 }
 118
 119 arch_initcall(s3c2412_pm_init);