LXR linux/arch/arm/mach-s3c24xx/pm.c

   1/* linux/arch/arm/plat-s3c24xx/pm.c
   2 *
   3 * Copyright (c) 2004-2006 Simtec Electronics
   4 *      Ben Dooks <ben@simtec.co.uk>
   5 *
   6 * S3C24XX Power Manager (Suspend-To-RAM) support
   7 *
   8 * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
   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 as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 *
  24 * Parts based on arch/arm/mach-pxa/pm.c
  25 *
  26 * Thanks to Dimitry Andric for debugging
  27*/
  28
  29#include <linux/init.h>
  30#include <linux/suspend.h>
  31#include <linux/errno.h>
  32#include <linux/time.h>
  33#include <linux/gpio.h>
  34#include <linux/interrupt.h>
  35#include <linux/serial_core.h>
  36#include <linux/io.h>
  37
  38#include <plat/regs-serial.h>
  39#include <mach/regs-clock.h>
  40#include <mach/regs-gpio.h>
  41#include <mach/regs-irq.h>
  42
  43#include <asm/mach/time.h>
  44
  45#include <plat/gpio-cfg.h>
  46#include <plat/pm.h>
  47
  48#include "regs-mem.h"
  49
  50#define PFX "s3c24xx-pm: "
  51
  52static struct sleep_save core_save[] = {
  53        SAVE_ITEM(S3C2410_LOCKTIME),
  54        SAVE_ITEM(S3C2410_CLKCON),
  55
  56        /* we restore the timings here, with the proviso that the board
  57         * brings the system up in an slower, or equal frequency setting
  58         * to the original system.
  59         *
  60         * if we cannot guarantee this, then things are going to go very
  61         * wrong here, as we modify the refresh and both pll settings.
  62         */
  63
  64        SAVE_ITEM(S3C2410_BWSCON),
  65        SAVE_ITEM(S3C2410_BANKCON0),
  66        SAVE_ITEM(S3C2410_BANKCON1),
  67        SAVE_ITEM(S3C2410_BANKCON2),
  68        SAVE_ITEM(S3C2410_BANKCON3),
  69        SAVE_ITEM(S3C2410_BANKCON4),
  70        SAVE_ITEM(S3C2410_BANKCON5),
  71
  72#ifndef CONFIG_CPU_FREQ
  73        SAVE_ITEM(S3C2410_CLKDIVN),
  74        SAVE_ITEM(S3C2410_MPLLCON),
  75        SAVE_ITEM(S3C2410_REFRESH),
  76#endif
  77        SAVE_ITEM(S3C2410_UPLLCON),
  78        SAVE_ITEM(S3C2410_CLKSLOW),
  79};
  80
  81static struct sleep_save misc_save[] = {
  82        SAVE_ITEM(S3C2410_DCLKCON),
  83};
  84
  85/* s3c_pm_check_resume_pin
  86 *
  87 * check to see if the pin is configured correctly for sleep mode, and
  88 * make any necessary adjustments if it is not
  89*/
  90
  91static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
  92{
  93        unsigned long irqstate;
  94        unsigned long pinstate;
  95        int irq = gpio_to_irq(pin);
  96
  97        if (irqoffs < 4)
  98                irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
  99        else
 100                irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
 101
 102        pinstate = s3c_gpio_getcfg(pin);
 103
 104        if (!irqstate) {
 105                if (pinstate == S3C2410_GPIO_IRQ)
 106                        S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq, pin);
 107        } else {
 108                if (pinstate == S3C2410_GPIO_IRQ) {
 109                        S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
 110                        s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
 111                }
 112        }
 113}
 114
 115/* s3c_pm_configure_extint
 116 *
 117 * configure all external interrupt pins
 118*/
 119
 120void s3c_pm_configure_extint(void)
 121{
 122        int pin;
 123
 124        /* for each of the external interrupts (EINT0..EINT15) we
 125         * need to check whether it is an external interrupt source,
 126         * and then configure it as an input if it is not
 127        */
 128
 129        for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
 130                s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
 131        }
 132
 133        for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
 134                s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
 135        }
 136}
 137
 138
 139void s3c_pm_restore_core(void)
 140{
 141        s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
 142        s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
 143}
 144
 145void s3c_pm_save_core(void)
 146{
 147        s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
 148        s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
 149}
 150
 151