kernel/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 #include <plat/wakeup-mask.h>
  33
  34 #include "regs-dsc.h"
  35 #include "s3c2412-power.h"
  36
  37 extern void s3c2412_sleep_enter(void);
  38
  39 static int s3c2412_cpu_suspend(unsigned long arg)
  40 {
  41         unsigned long tmp;
  42
  43         /* set our standby method to sleep */
  44
  45         tmp = __raw_readl(S3C2412_PWRCFG);
  46         tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  47         __raw_writel(tmp, S3C2412_PWRCFG);
  48
  49         s3c2412_sleep_enter();
  50
  51         pr_info("Failed to suspend the system\n");
  52         return 1; /* Aborting suspend */
  53 }
  54
  55 /* mapping of interrupts to parts of the wakeup mask */
  56 static struct samsung_wakeup_mask wake_irqs[] = {
  57         { .irq = IRQ_RTC,       .bit = S3C2412_PWRCFG_RTC_MASKIRQ, },
  58 };
  59
  60 static void s3c2412_pm_prepare(void)
  61 {
  62         samsung_sync_wakemask(S3C2412_PWRCFG,
  63                               wake_irqs, ARRAY_SIZE(wake_irqs));
  64 }
  65
  66 static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
  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_GPFSLPCON),
  92         SAVE_ITEM(S3C2412_GPGSLPCON),
  93         SAVE_ITEM(S3C2412_GPHSLPCON),
  94         SAVE_ITEM(S3C2413_GPJSLPCON),
  95 };
  96
  97 static struct subsys_interface s3c2412_pm_interface = {
  98         .name           = "s3c2412_pm",
  99         .subsys         = &s3c2412_subsys,
 100         .add_dev        = s3c2412_pm_add,
 101 };
 102
 103 static __init int s3c2412_pm_init(void)
 104 {
 105         return subsys_interface_register(&s3c2412_pm_interface);
 106 }
 107
 108 arch_initcall(s3c2412_pm_init);
 109
 110 static int s3c2412_pm_suspend(void)
 111 {
 112         s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 113         return 0;
 114 }
 115
 116 static void s3c2412_pm_resume(void)
 117 {
 118         unsigned long tmp;
 119
 120         tmp = __raw_readl(S3C2412_PWRCFG);
 121         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 122         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 123         __raw_writel(tmp, S3C2412_PWRCFG);
 124
 125         s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 126 }
 127
 128 struct syscore_ops s3c2412_pm_syscore_ops = {
 129         .suspend        = s3c2412_pm_suspend,
 130         .resume         = s3c2412_pm_resume,
 131 };