arch/arm/plat-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-mem.h>
  42 #include <mach/regs-irq.h>
  43
  44 #include <asm/mach/time.h>
  45
  46 #include <plat/pm.h>
  47
  48 #define PFX "s3c24xx-pm: "
  49
  50 static struct sleep_save core_save[] = {
  51         SAVE_ITEM(S3C2410_LOCKTIME),
  52         SAVE_ITEM(S3C2410_CLKCON),
  53
  54         /* we restore the timings here, with the proviso that the board
  55          * brings the system up in an slower, or equal frequency setting
  56          * to the original system.
  57          *
  58          * if we cannot guarantee this, then things are going to go very
  59          * wrong here, as we modify the refresh and both pll settings.
  60          */
  61
  62         SAVE_ITEM(S3C2410_BWSCON),
  63         SAVE_ITEM(S3C2410_BANKCON0),
  64         SAVE_ITEM(S3C2410_BANKCON1),
  65         SAVE_ITEM(S3C2410_BANKCON2),
  66         SAVE_ITEM(S3C2410_BANKCON3),
  67         SAVE_ITEM(S3C2410_BANKCON4),
  68         SAVE_ITEM(S3C2410_BANKCON5),
  69
  70 #ifndef CONFIG_CPU_FREQ
  71         SAVE_ITEM(S3C2410_CLKDIVN),
  72         SAVE_ITEM(S3C2410_MPLLCON),
  73         SAVE_ITEM(S3C2410_REFRESH),
  74 #endif
  75         SAVE_ITEM(S3C2410_UPLLCON),
  76         SAVE_ITEM(S3C2410_CLKSLOW),
  77 };
  78
  79 static struct sleep_save misc_save[] = {
  80         SAVE_ITEM(S3C2410_DCLKCON),
  81 };
  82
  83 /* s3c_pm_check_resume_pin
  84  *
  85  * check to see if the pin is configured correctly for sleep mode, and
  86  * make any necessary adjustments if it is not
  87 */
  88
  89 static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
  90 {
  91         unsigned long irqstate;
  92         unsigned long pinstate;
  93         int irq = s3c2410_gpio_getirq(pin);
  94
  95         if (irqoffs < 4)
  96                 irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
  97         else
  98                 irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
  99
 100         pinstate = s3c2410_gpio_getcfg(pin);
 101
 102         if (!irqstate) {
 103                 if (pinstate == S3C2410_GPIO_IRQ)
 104                         S3C_PMDBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin);
 105         } else {
 106                 if (pinstate == S3C2410_GPIO_IRQ) {
 107                         S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
 108                         s3c2410_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
 109                 }
 110         }
 111 }
 112
 113 /* s3c_pm_configure_extint
 114  *
 115  * configure all external interrupt pins
 116 */
 117
 118 void s3c_pm_configure_extint(void)
 119 {
 120         int pin;
 121
 122         /* for each of the external interrupts (EINT0..EINT15) we
 123          * need to check wether it is an external interrupt source,
 124          * and then configure it as an input if it is not
 125         */
 126
 127         for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
 128                 s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
 129         }
 130
 131         for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
 132                 s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
 133         }
 134 }
 135
 136
 137 void s3c_pm_restore_core(void)
 138 {
 139         s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
 140         s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
 141 }
 142
 143 void s3c_pm_save_core(void)
 144 {
 145         s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
 146         s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
 147 }
 148