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   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
  22 #include <asm/hardware.h>
  23 #include <asm/io.h>
  24 #include <asm/irq.h>
  25
  26 #include <asm/arch/regs-power.h>
  27 #include <asm/arch/regs-gpioj.h>
  28 #include <asm/arch/regs-gpio.h>
  29 #include <asm/arch/regs-dsc.h>
  30
  31 #include <asm/plat-s3c24xx/cpu.h>
  32 #include <asm/plat-s3c24xx/pm.h>
  33
  34 #include <asm/plat-s3c24xx/s3c2412.h>
  35
  36 static void s3c2412_cpu_suspend(void)
  37 {
  38         unsigned long tmp;
  39
  40         /* set our standby method to sleep */
  41
  42         tmp = __raw_readl(S3C2412_PWRCFG);
  43         tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  44         __raw_writel(tmp, S3C2412_PWRCFG);
  45
  46         /* issue the standby signal into the pm unit. Note, we
  47          * issue a write-buffer drain just in case */
  48
  49         tmp = 0;
  50
  51         asm("b 1f\n\t"
  52             ".align 5\n\t"
  53             "1:\n\t"
  54             "mcr p15, 0, %0, c7, c10, 4\n\t"
  55             "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
  56
  57         /* we should never get past here */
  58
  59         panic("sleep resumed to originator?");
  60 }
  61
  62 static void s3c2412_pm_prepare(void)
  63 {
  64 }
  65
  66 static int s3c2412_pm_add(struct sys_device *sysdev)
  67 {
  68         pm_cpu_prep = s3c2412_pm_prepare;
  69         pm_cpu_sleep = s3c2412_cpu_suspend;
  70
  71         return 0;
  72 }
  73
  74 static struct sleep_save s3c2412_sleep[] = {
  75         SAVE_ITEM(S3C2412_DSC0),
  76         SAVE_ITEM(S3C2412_DSC1),
  77         SAVE_ITEM(S3C2413_GPJDAT),
  78         SAVE_ITEM(S3C2413_GPJCON),
  79         SAVE_ITEM(S3C2413_GPJUP),
  80
  81         /* save the PWRCFG to get back to original sleep method */
  82
  83         SAVE_ITEM(S3C2412_PWRCFG),
  84
  85         /* save the sleep configuration anyway, just in case these
  86          * get damaged during wakeup */
  87
  88         SAVE_ITEM(S3C2412_GPBSLPCON),
  89         SAVE_ITEM(S3C2412_GPCSLPCON),
  90         SAVE_ITEM(S3C2412_GPDSLPCON),
  91         SAVE_ITEM(S3C2412_GPESLPCON),
  92         SAVE_ITEM(S3C2412_GPFSLPCON),
  93         SAVE_ITEM(S3C2412_GPGSLPCON),
  94         SAVE_ITEM(S3C2412_GPHSLPCON),
  95         SAVE_ITEM(S3C2413_GPJSLPCON),
  96 };
  97
  98 static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
  99 {
 100         s3c2410_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 101         return 0;
 102 }
 103
 104 static int s3c2412_pm_resume(struct sys_device *dev)
 105 {
 106         unsigned long tmp;
 107
 108         tmp = __raw_readl(S3C2412_PWRCFG);
 109         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 110         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 111         __raw_writel(tmp, S3C2412_PWRCFG);
 112
 113         s3c2410_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 114         return 0;
 115 }
 116
 117 static struct sysdev_driver s3c2412_pm_driver = {
 118         .add            = s3c2412_pm_add,
 119         .suspend        = s3c2412_pm_suspend,
 120         .resume         = s3c2412_pm_resume,
 121 };
 122
 123 static __init int s3c2412_pm_init(void)
 124 {
 125         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
 126 }
 127
 128 arch_initcall(s3c2412_pm_init);