LXR linux/arch/arm/mach-s3c/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/irqs.h>
  23#include "regs-gpio.h"
  24
  25#include "cpu.h"
  26#include "pm.h"
  27#include "wakeup-mask.h"
  28
  29#include "regs-dsc-s3c24xx.h"
  30#include "s3c2412-power.h"
  31
  32extern void s3c2412_sleep_enter(void);
  33
  34static 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 */
  51static const struct samsung_wakeup_mask wake_irqs[] = {
  52        { .irq = IRQ_RTC,       .bit = S3C2412_PWRCFG_RTC_MASKIRQ, },
  53};
  54
  55static void s3c2412_pm_prepare(void)
  56{
  57        samsung_sync_wakemask(S3C2412_PWRCFG,
  58                              wake_irqs, ARRAY_SIZE(wake_irqs));
  59}
  60
  61static 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
  69static 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
  92static struct subsys_interface s3c2412_pm_interface = {
  93        .name           = "s3c2412_pm",
  94        .subsys         = &s3c2412_subsys,
  95        .add_dev        = s3c2412_pm_add,
  96};
  97
  98static __init int s3c2412_pm_init(void)
  99{
 100        return subsys_interface_register(&s3c2412_pm_interface);
 101}
 102
 103arch_initcall(s3c2412_pm_init);
 104
 105static int s3c2412_pm_suspend(void)
 106{
 107        s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
 108        return 0;
 109}
 110
 111static 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
 123struct syscore_ops s3c2412_pm_syscore_ops = {
 124        .suspend        = s3c2412_pm_suspend,
 125        .resume         = s3c2412_pm_resume,
 126};
 127