1// SPDX-License-Identifier: GPL-2.0+
  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// Parts based on arch/arm/mach-pxa/pm.c
 11//
 12// Thanks to Dimitry Andric for debugging
 13
 14#include <linux/init.h>
 15#include <linux/suspend.h>
 16#include <linux/errno.h>
 17#include <linux/time.h>
 18#include <linux/gpio.h>
 19#include <linux/interrupt.h>
 20#include <linux/serial_core.h>
 21#include <linux/serial_s3c.h>
 22#include <linux/io.h>
 23
 24#include <mach/regs-clock.h>
 25#include <mach/regs-gpio.h>
 26#include <mach/regs-irq.h>
 27#include <mach/gpio-samsung.h>
 28
 29#include <asm/mach/time.h>
 30
 31#include <plat/gpio-cfg.h>
 32#include <plat/pm.h>
 33
 34#include "regs-mem.h"
 35
 36#define PFX "s3c24xx-pm: "
 37
 38#ifdef CONFIG_PM_SLEEP
 39static struct sleep_save core_save[] = {
 40	/* we restore the timings here, with the proviso that the board
 41	 * brings the system up in an slower, or equal frequency setting
 42	 * to the original system.
 43	 *
 44	 * if we cannot guarantee this, then things are going to go very
 45	 * wrong here, as we modify the refresh and both pll settings.
 46	 */
 47
 48	SAVE_ITEM(S3C2410_BWSCON),
 49	SAVE_ITEM(S3C2410_BANKCON0),
 50	SAVE_ITEM(S3C2410_BANKCON1),
 51	SAVE_ITEM(S3C2410_BANKCON2),
 52	SAVE_ITEM(S3C2410_BANKCON3),
 53	SAVE_ITEM(S3C2410_BANKCON4),
 54	SAVE_ITEM(S3C2410_BANKCON5),
 55};
 56#endif
 57
 58/* s3c_pm_check_resume_pin
 59 *
 60 * check to see if the pin is configured correctly for sleep mode, and
 61 * make any necessary adjustments if it is not
 62*/
 63
 64static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
 65{
 66	unsigned long irqstate;
 67	unsigned long pinstate;
 68	int irq = gpio_to_irq(pin);
 69
 70	if (irqoffs < 4)
 71		irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
 72	else
 73		irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
 74
 75	pinstate = s3c_gpio_getcfg(pin);
 76
 77	if (!irqstate) {
 78		if (pinstate == S3C2410_GPIO_IRQ)
 79			S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq, pin);
 80	} else {
 81		if (pinstate == S3C2410_GPIO_IRQ) {
 82			S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
 83			s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
 84		}
 85	}
 86}
 87
 88/* s3c_pm_configure_extint
 89 *
 90 * configure all external interrupt pins
 91*/
 92
 93void s3c_pm_configure_extint(void)
 94{
 95	int pin;
 96
 97	/* for each of the external interrupts (EINT0..EINT15) we
 98	 * need to check whether it is an external interrupt source,
 99	 * and then configure it as an input if it is not
100	*/
101
102	for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
103		s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
104	}
105
106	for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
107		s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
108	}
109}
110
111#ifdef CONFIG_PM_SLEEP
112void s3c_pm_restore_core(void)
113{
114	s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
115}
116
117void s3c_pm_save_core(void)
118{
119	s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
120}
121#endif