/* linux/arch/arm/plat-s3c24xx/pm.c
   *
   * Copyright (c) 2004-2006 Simtec Electronics
   *	Ben Dooks <ben@simtec.co.uk>
   *
   * S3C24XX Power Manager (Suspend-To-RAM) support
   *
   * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   * Parts based on arch/arm/mach-pxa/pm.c
   *
   * Thanks to Dimitry Andric for debugging
  */
  
  #include <linux/init.h>
  #include <linux/suspend.h>
  #include <linux/errno.h>
  #include <linux/time.h>
  #include <linux/gpio.h>
  #include <linux/interrupt.h>
  #include <linux/serial_core.h>
  #include <linux/io.h>
  
  #include <plat/regs-serial.h>
  #include <mach/regs-clock.h>
  #include <mach/regs-gpio.h>
  #include <mach/regs-irq.h>
  #include <mach/gpio-samsung.h>
  
  #include <asm/mach/time.h>
  
  #include <plat/gpio-cfg.h>
  #include <plat/pm.h>
  
  #include "regs-mem.h"
  
  #define PFX "s3c24xx-pm: "
  
  static struct sleep_save core_save[] = {
  	SAVE_ITEM(S3C2410_LOCKTIME),
  	SAVE_ITEM(S3C2410_CLKCON),
  
  	/* we restore the timings here, with the proviso that the board
  	 * brings the system up in an slower, or equal frequency setting
  	 * to the original system.
  	 *
  	 * if we cannot guarantee this, then things are going to go very
  	 * wrong here, as we modify the refresh and both pll settings.
  	 */
  
  	SAVE_ITEM(S3C2410_BWSCON),
  	SAVE_ITEM(S3C2410_BANKCON0),
  	SAVE_ITEM(S3C2410_BANKCON1),
  	SAVE_ITEM(S3C2410_BANKCON2),
  	SAVE_ITEM(S3C2410_BANKCON3),
  	SAVE_ITEM(S3C2410_BANKCON4),
  	SAVE_ITEM(S3C2410_BANKCON5),
  
  #ifndef CONFIG_CPU_FREQ
  	SAVE_ITEM(S3C2410_CLKDIVN),
  	SAVE_ITEM(S3C2410_MPLLCON),
  	SAVE_ITEM(S3C2410_REFRESH),
  #endif
  	SAVE_ITEM(S3C2410_UPLLCON),
  	SAVE_ITEM(S3C2410_CLKSLOW),
  };
  
  static struct sleep_save misc_save[] = {
  	SAVE_ITEM(S3C2410_DCLKCON),
  };
  
  /* s3c_pm_check_resume_pin
   *
   * check to see if the pin is configured correctly for sleep mode, and
   * make any necessary adjustments if it is not
  */
  
  static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
  {
  	unsigned long irqstate;
  	unsigned long pinstate;
  	int irq = gpio_to_irq(pin);
  
  	if (irqoffs < 4)
  		irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
  	else
  		irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
  
  	pinstate = s3c_gpio_getcfg(pin);
  
  	if (!irqstate) {
  		if (pinstate == S3C2410_GPIO_IRQ)
  			S3C_PMDBG("Leaving IRQ %d (pin %d) as is
  ", irq, pin);
  	} else {
  		if (pinstate == S3C2410_GPIO_IRQ) {
  			S3C_PMDBG("Disabling IRQ %d (pin %d)
  ", irq, pin);
  			s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
  		}
  	}
  }
  
  /* s3c_pm_configure_extint
   *
   * configure all external interrupt pins
  */
  
  void s3c_pm_configure_extint(void)
  {
  	int pin;
  
  	/* for each of the external interrupts (EINT0..EINT15) we
  	 * need to check whether it is an external interrupt source,
  	 * and then configure it as an input if it is not
  	*/
  
  	for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
  		s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
  	}
  
  	for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
  		s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
  	}
  }
  
  
  void s3c_pm_restore_core(void)
  {
  	s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
  	s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
  }
  
  void s3c_pm_save_core(void)
  {
  	s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
  	s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
  }