/* arch/arm/plat-s3c64xx/irq-pm.c
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.simtec.co.uk/
 *
 * S3C64XX - Interrupt handling Power Management
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/sysdev.h>
#include <linux/interrupt.h>
#include <linux/serial_core.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <asm/hardware/vic.h>

#include <mach/map.h>

#include <plat/regs-serial.h>
#include <plat/regs-timer.h>
#include <plat/regs-gpio.h>
#include <plat/cpu.h>
#include <plat/pm.h>

/* We handled all the IRQ types in this code, to save having to make several
 * small files to handle each different type separately. Having the EINT_GRP
 * code here shouldn't be as much bloat as the IRQ table space needed when
 * they are enabled. The added benefit is we ensure that these registers are
 * in the same state as we suspended.
 */

static struct sleep_save irq_save[] = {
	SAVE_ITEM(S3C64XX_PRIORITY),
	SAVE_ITEM(S3C64XX_EINT0CON0),
	SAVE_ITEM(S3C64XX_EINT0CON1),
	SAVE_ITEM(S3C64XX_EINT0FLTCON0),
	SAVE_ITEM(S3C64XX_EINT0FLTCON1),
	SAVE_ITEM(S3C64XX_EINT0FLTCON2),
	SAVE_ITEM(S3C64XX_EINT0FLTCON3),
	SAVE_ITEM(S3C64XX_EINT0MASK),
	SAVE_ITEM(S3C64XX_TINT_CSTAT),
};

static struct irq_grp_save {
	u32	fltcon;
	u32	con;
	u32	mask;
} eint_grp_save[5];

struct irq_vic_save {
	u32	int_select;
	u32	int_enable;
	u32	soft_int;
	u32	protect;
	u32	vect_addr[32];
	u32	vect_cntl[32];
};

static struct irq_vic_save irq_pm_vic0_save;
static struct irq_vic_save irq_pm_vic1_save;

static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];

static void s3c64xx_vic_save(void __iomem *base, struct irq_vic_save *save)
{
	int v;

	save->int_select = readl(base + VIC_INT_SELECT);
	save->int_enable = readl(base + VIC_INT_ENABLE);
	save->soft_int = readl(base + VIC_INT_SOFT);
	save->protect = readl(base + VIC_PROTECT);

	S3C_PMDBG("%s: select=%08x, enable=%08x, protect=%08x\n", __func__,
		  save->int_select, save->int_enable, save->protect);

	for (v = 0; v < ARRAY_SIZE(save->vect_addr); v++) {
		save->vect_addr[v] = readl(base + VIC_VECT_ADDR0 + (v * 4));
		save->vect_cntl[v] = readl(base + VIC_VECT_CNTL0 + (v * 4));
	}
}

static void s3c64xx_vic_restore(void __iomem *base, struct irq_vic_save *save)
{
	int v;

	writel(save->int_select, base + VIC_INT_SELECT);
	writel(save->protect, base + VIC_PROTECT);

	/* set the enabled ints and then clear the non-enabled */
	writel(save->int_enable, base + VIC_INT_ENABLE);
	writel(~save->int_enable, base + VIC_INT_ENABLE_CLEAR);

	/* and the same for the soft-int register */

	writel(save->soft_int, base + VIC_INT_SOFT);
	writel(~save->soft_int, base + VIC_INT_SOFT_CLEAR);

	S3C_PMDBG("%s: vic int_enable=%08x\n", __func__, readl(base + VIC_INT_ENABLE));

	for (v = 0; v < ARRAY_SIZE(save->vect_addr); v++) {
		writel(save->vect_addr[v], base + VIC_VECT_ADDR0 + (v * 4));
		writel(save->vect_cntl[v], base + VIC_VECT_CNTL0 + (v * 4));
	}
}

static int s3c64xx_irq_pm_suspend(struct sys_device *dev, pm_message_t state)
{
	struct irq_grp_save *grp = eint_grp_save;
	int i;

	S3C_PMDBG("%s: suspending IRQs\n", __func__);

	s3c64xx_vic_save(S3C_VA_VIC0, &irq_pm_vic0_save);
	s3c64xx_vic_save(S3C_VA_VIC1, &irq_pm_vic1_save);

	s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));

	for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
		irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);

	for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
		grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
		grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
		grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
	}

	return 0;
}

static int s3c64xx_irq_pm_resume(struct sys_device *dev)
{
	struct irq_grp_save *grp = eint_grp_save;
	int i;

	S3C_PMDBG("%s: resuming IRQs\n", __func__);

	s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));

	s3c64xx_vic_restore(S3C_VA_VIC0, &irq_pm_vic0_save);
	s3c64xx_vic_restore(S3C_VA_VIC1, &irq_pm_vic1_save);

	for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
		__raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);

	for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
		__raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
		__raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
		__raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
	}

	S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
	return 0;
}

static struct sysdev_driver s3c64xx_irq_driver = {
	.suspend = s3c64xx_irq_pm_suspend,
	.resume	 = s3c64xx_irq_pm_resume,
};

static int __init s3c64xx_irq_pm_init(void)
{
	return sysdev_driver_register(&s3c64xx_sysclass, &s3c64xx_irq_driver);
}

arch_initcall(s3c64xx_irq_pm_init);