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/serial_s3c.h>
 37#include <linux/io.h>
 38
 39#include <mach/regs-clock.h>
 40#include <mach/regs-gpio.h>
 41#include <mach/regs-irq.h>
 42#include <mach/gpio-samsung.h>
 43
 44#include <asm/mach/time.h>
 45
 46#include <plat/gpio-cfg.h>
 47#include <plat/pm.h>
 48
 49#include "regs-mem.h"
 50
 51#define PFX "s3c24xx-pm: "
 52
 53static struct sleep_save core_save[] = {
 54	SAVE_ITEM(S3C2410_LOCKTIME),
 55	SAVE_ITEM(S3C2410_CLKCON),
 56
 57	/* we restore the timings here, with the proviso that the board
 58	 * brings the system up in an slower, or equal frequency setting
 59	 * to the original system.
 60	 *
 61	 * if we cannot guarantee this, then things are going to go very
 62	 * wrong here, as we modify the refresh and both pll settings.
 63	 */
 64
 65	SAVE_ITEM(S3C2410_BWSCON),
 66	SAVE_ITEM(S3C2410_BANKCON0),
 67	SAVE_ITEM(S3C2410_BANKCON1),
 68	SAVE_ITEM(S3C2410_BANKCON2),
 69	SAVE_ITEM(S3C2410_BANKCON3),
 70	SAVE_ITEM(S3C2410_BANKCON4),
 71	SAVE_ITEM(S3C2410_BANKCON5),
 72
 73#ifndef CONFIG_CPU_FREQ
 74	SAVE_ITEM(S3C2410_CLKDIVN),
 75	SAVE_ITEM(S3C2410_MPLLCON),
 76	SAVE_ITEM(S3C2410_REFRESH),
 77#endif
 78	SAVE_ITEM(S3C2410_UPLLCON),
 79	SAVE_ITEM(S3C2410_CLKSLOW),
 80};
 81
 82static struct sleep_save misc_save[] = {
 83	SAVE_ITEM(S3C2410_DCLKCON),
 84};
 85
 86/* s3c_pm_check_resume_pin
 87 *
 88 * check to see if the pin is configured correctly for sleep mode, and
 89 * make any necessary adjustments if it is not
 90*/
 91
 92static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
 93{
 94	unsigned long irqstate;
 95	unsigned long pinstate;
 96	int irq = gpio_to_irq(pin);
 97
 98	if (irqoffs < 4)
 99		irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
100	else
101		irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
102
103	pinstate = s3c_gpio_getcfg(pin);
104
105	if (!irqstate) {
106		if (pinstate == S3C2410_GPIO_IRQ)
107			S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq, pin);
108	} else {
109		if (pinstate == S3C2410_GPIO_IRQ) {
110			S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
111			s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
112		}
113	}
114}
115
116/* s3c_pm_configure_extint
117 *
118 * configure all external interrupt pins
119*/
120
121void s3c_pm_configure_extint(void)
122{
123	int pin;
124
125	/* for each of the external interrupts (EINT0..EINT15) we
126	 * need to check whether it is an external interrupt source,
127	 * and then configure it as an input if it is not
128	*/
129
130	for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
131		s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
132	}
133
134	for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
135		s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
136	}
137}
138
139
140void s3c_pm_restore_core(void)
141{
142	s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
143	s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
144}
145
146void s3c_pm_save_core(void)
147{
148	s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
149	s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
150}
151