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/device.h>
  20 #include <linux/syscore_ops.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23
  24 #include <mach/hardware.h>
  25 #include <asm/cacheflush.h>
  26 #include <asm/irq.h>
  27
  28 #include <mach/regs-power.h>
  29 #include <mach/regs-gpioj.h>
  30 #include <mach/regs-gpio.h>
  31 #include <mach/regs-dsc.h>
  32
  33 #include <plat/cpu.h>
  34 #include <plat/pm.h>
  35
  36 #include <plat/s3c2412.h>
  37
  38 extern void s3c2412_sleep_enter(void);
  39
  40 static int s3c2412_cpu_suspend(unsigned long arg)
  41 {
  42         unsigned long tmp;
  43
  44         /* set our standby method to sleep */
  45
  46         tmp = __raw_readl(S3C2412_PWRCFG);
  47         tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  48         __raw_writel(tmp, S3C2412_PWRCFG);
  49
  50         s3c2412_sleep_enter();
  51
  52         panic("sleep resumed to originator?");
  53 }
  54
  55 static void s3c2412_pm_prepare(void)
  56 {
  57 }
  58
  59 static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
  60 {
  61         pm_cpu_prep = s3c2412_pm_prepare;
  62         pm_cpu_sleep = s3c2412_cpu_suspend;
  63
  64         return 0;
  65 }
  66
  67 static struct sleep_save s3c2412_sleep[] = {
  68         SAVE_ITEM(S3C2412_DSC0),
  69         SAVE_ITEM(S3C2412_DSC1),
  70         SAVE_ITEM(S3C2413_GPJDAT),
  71         SAVE_ITEM(S3C2413_GPJCON),
  72         SAVE_ITEM(S3C2413_GPJUP),
  73
  74         /* save the PWRCFG to get back to original sleep method */
  75
  76         SAVE_ITEM(S3C2412_PWRCFG),
  77
  78         /* save the sleep configuration anyway, just in case these
  79          * get damaged during wakeup */
  80
  81         SAVE_ITEM(S3C2412_GPBSLPCON),
  82         SAVE_ITEM(S3C2412_GPCSLPCON),
  83         SAVE_ITEM(S3C2412_GPDSLPCON),
  84         SAVE_ITEM(S3C2412_GPFSLPCON),
  85         SAVE_ITEM(S3C2412_GPGSLPCON),
  86         SAVE_ITEM(S3C2412_GPHSLPCON),
  87         SAVE_ITEM(S3C2413_GPJSLPCON),
  88 };
  89
  90 static struct subsys_interface s3c2412_pm_interface = {
  91         .name           = "s3c2412_pm",
  92         .subsys         = &s3c2412_subsys,
  93         .add_dev        = s3c2412_pm_add,
  94 };
  95
  96 static __init int s3c2412_pm_init(void)
  97 {
  98         return subsys_interface_register(&s3c2412_pm_interface);
  99 }
 100
 101 arch_initcall(s3c2412_pm_init);
 102
 103 static int s3c2412_pm_suspend(void)
 104 {
 105         s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 106         return 0;
 107 }
 108
 109 static void s3c2412_pm_resume(void)
 110 {
 111         unsigned long tmp;
 112
 113         tmp = __raw_readl(S3C2412_PWRCFG);
 114         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 115         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 116         __raw_writel(tmp, S3C2412_PWRCFG);
 117
 118         s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 119 }
 120
 121 struct syscore_ops s3c2412_pm_syscore_ops = {
 122         .suspend        = s3c2412_pm_suspend,
 123         .resume         = s3c2412_pm_resume,
 124 };