LXR linux/arch/arm/mach-s3c64xx/irq-pm.c

   1/* arch/arm/plat-s3c64xx/irq-pm.c
   2 *
   3 * Copyright 2008 Openmoko, Inc.
   4 * Copyright 2008 Simtec Electronics
   5 *      Ben Dooks <ben@simtec.co.uk>
   6 *      http://armlinux.simtec.co.uk/
   7 *
   8 * S3C64XX - Interrupt handling Power Management
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14
  15/*
  16 * NOTE: Code in this file is not used when booting with Device Tree support.
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/syscore_ops.h>
  21#include <linux/interrupt.h>
  22#include <linux/serial_core.h>
  23#include <linux/serial_s3c.h>
  24#include <linux/irq.h>
  25#include <linux/io.h>
  26#include <linux/of.h>
  27
  28#include <mach/map.h>
  29
  30#include <mach/regs-gpio.h>
  31#include <plat/cpu.h>
  32#include <plat/pm.h>
  33
  34/* We handled all the IRQ types in this code, to save having to make several
  35 * small files to handle each different type separately. Having the EINT_GRP
  36 * code here shouldn't be as much bloat as the IRQ table space needed when
  37 * they are enabled. The added benefit is we ensure that these registers are
  38 * in the same state as we suspended.
  39 */
  40
  41static struct sleep_save irq_save[] = {
  42        SAVE_ITEM(S3C64XX_PRIORITY),
  43        SAVE_ITEM(S3C64XX_EINT0CON0),
  44        SAVE_ITEM(S3C64XX_EINT0CON1),
  45        SAVE_ITEM(S3C64XX_EINT0FLTCON0),
  46        SAVE_ITEM(S3C64XX_EINT0FLTCON1),
  47        SAVE_ITEM(S3C64XX_EINT0FLTCON2),
  48        SAVE_ITEM(S3C64XX_EINT0FLTCON3),
  49        SAVE_ITEM(S3C64XX_EINT0MASK),
  50};
  51
  52static struct irq_grp_save {
  53        u32     fltcon;
  54        u32     con;
  55        u32     mask;
  56} eint_grp_save[5];
  57
  58#ifndef CONFIG_SERIAL_SAMSUNG_UARTS
  59#define SERIAL_SAMSUNG_UARTS 0
  60#else
  61#define SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
  62#endif
  63
  64static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
  65
  66static int s3c64xx_irq_pm_suspend(void)
  67{
  68        struct irq_grp_save *grp = eint_grp_save;
  69        int i;
  70
  71        S3C_PMDBG("%s: suspending IRQs\n", __func__);
  72
  73        s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  74
  75        for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
  76                irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
  77
  78        for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
  79                grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
  80                grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
  81                grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
  82        }
  83
  84        return 0;
  85}
  86
  87static void s3c64xx_irq_pm_resume(void)
  88{
  89        struct irq_grp_save *grp = eint_grp_save;
  90        int i;
  91
  92        S3C_PMDBG("%s: resuming IRQs\n", __func__);
  93
  94        s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  95
  96        for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
  97                __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
  98
  99        for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
 100                __raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
 101                __raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
 102                __raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
 103        }
 104
 105        S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
 106}
 107
 108static struct syscore_ops s3c64xx_irq_syscore_ops = {
 109        .suspend = s3c64xx_irq_pm_suspend,
 110        .resume  = s3c64xx_irq_pm_resume,
 111};
 112
 113static __init int s3c64xx_syscore_init(void)
 114{
 115        /* Appropriate drivers (pinctrl, uart) handle this when using DT. */
 116        if (of_have_populated_dt())
 117                return 0;
 118
 119        register_syscore_ops(&s3c64xx_irq_syscore_ops);
 120
 121        return 0;
 122}
 123
 124core_initcall(s3c64xx_syscore_init);
 125