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
  52 static 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
  81 static 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
  91 static 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
 120 void 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
 139 void 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
 145 void 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