arch/arm/mach-s3c24xx/pm-s3c2412.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2006 Simtec Electronics
   4 //      Ben Dooks <ben@simtec.co.uk>
   5 //
   6 // http://armlinux.simtec.co.uk/.
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/list.h>
  12 #include <linux/timer.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/syscore_ops.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/io.h>
  18
  19 #include <asm/cacheflush.h>
  20 #include <asm/irq.h>
  21
  22 #include <mach/hardware.h>
  23 #include <mach/regs-gpio.h>
  24
  25 #include <plat/cpu.h>
  26 #include <plat/pm.h>
  27 #include <plat/wakeup-mask.h>
  28
  29 #include "regs-dsc.h"
  30 #include "s3c2412-power.h"
  31
  32 extern void s3c2412_sleep_enter(void);
  33
  34 static int s3c2412_cpu_suspend(unsigned long arg)
  35 {
  36         unsigned long tmp;
  37
  38         /* set our standby method to sleep */
  39
  40         tmp = __raw_readl(S3C2412_PWRCFG);
  41         tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
  42         __raw_writel(tmp, S3C2412_PWRCFG);
  43
  44         s3c2412_sleep_enter();
  45
  46         pr_info("Failed to suspend the system\n");
  47         return 1; /* Aborting suspend */
  48 }
  49
  50 /* mapping of interrupts to parts of the wakeup mask */
  51 static const struct samsung_wakeup_mask wake_irqs[] = {
  52         { .irq = IRQ_RTC,       .bit = S3C2412_PWRCFG_RTC_MASKIRQ, },
  53 };
  54
  55 static void s3c2412_pm_prepare(void)
  56 {
  57         samsung_sync_wakemask(S3C2412_PWRCFG,
  58                               wake_irqs, ARRAY_SIZE(wake_irqs));
  59 }
  60
  61 static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
  62 {
  63         pm_cpu_prep = s3c2412_pm_prepare;
  64         pm_cpu_sleep = s3c2412_cpu_suspend;
  65
  66         return 0;
  67 }
  68
  69 static struct sleep_save s3c2412_sleep[] = {
  70         SAVE_ITEM(S3C2412_DSC0),
  71         SAVE_ITEM(S3C2412_DSC1),
  72         SAVE_ITEM(S3C2413_GPJDAT),
  73         SAVE_ITEM(S3C2413_GPJCON),
  74         SAVE_ITEM(S3C2413_GPJUP),
  75
  76         /* save the PWRCFG to get back to original sleep method */
  77
  78         SAVE_ITEM(S3C2412_PWRCFG),
  79
  80         /* save the sleep configuration anyway, just in case these
  81          * get damaged during wakeup */
  82
  83         SAVE_ITEM(S3C2412_GPBSLPCON),
  84         SAVE_ITEM(S3C2412_GPCSLPCON),
  85         SAVE_ITEM(S3C2412_GPDSLPCON),
  86         SAVE_ITEM(S3C2412_GPFSLPCON),
  87         SAVE_ITEM(S3C2412_GPGSLPCON),
  88         SAVE_ITEM(S3C2412_GPHSLPCON),
  89         SAVE_ITEM(S3C2413_GPJSLPCON),
  90 };
  91
  92 static struct subsys_interface s3c2412_pm_interface = {
  93         .name           = "s3c2412_pm",
  94         .subsys         = &s3c2412_subsys,
  95         .add_dev        = s3c2412_pm_add,
  96 };
  97
  98 static __init int s3c2412_pm_init(void)
  99 {
 100         return subsys_interface_register(&s3c2412_pm_interface);
 101 }
 102
 103 arch_initcall(s3c2412_pm_init);
 104
 105 static int s3c2412_pm_suspend(void)
 106 {
 107         s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 108         return 0;
 109 }
 110
 111 static void s3c2412_pm_resume(void)
 112 {
 113         unsigned long tmp;
 114
 115         tmp = __raw_readl(S3C2412_PWRCFG);
 116         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 117         tmp |=  S3C2412_PWRCFG_STANDBYWFI_IDLE;
 118         __raw_writel(tmp, S3C2412_PWRCFG);
 119
 120         s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 121 }
 122
 123 struct syscore_ops s3c2412_pm_syscore_ops = {
 124         .suspend        = s3c2412_pm_suspend,
 125         .resume         = s3c2412_pm_resume,
 126 };