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// SPDX-License-Identifier: GPL-2.0
//
// Copyright 2008 Openmoko, Inc.
// Copyright 2008 Simtec Electronics
// Ben Dooks <ben@simtec.co.uk>
// http://armlinux.simtec.co.uk/
//
// S3C64XX - Interrupt handling Power Management
/*
* NOTE: Code in this file is not used when booting with Device Tree support.
*/
#include <linux/kernel.h>
#include <linux/syscore_ops.h>
#include <linux/interrupt.h>
#include <linux/serial_core.h>
#include <linux/serial_s3c.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/of.h>
#include "map.h"
#include "regs-gpio.h"
#include "cpu.h"
#include "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),
};
static struct irq_grp_save {
u32 fltcon;
u32 con;
u32 mask;
} eint_grp_save[5];
#ifndef CONFIG_SERIAL_SAMSUNG_UARTS
#define SERIAL_SAMSUNG_UARTS 0
#else
#define SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
#endif
static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
static int s3c64xx_irq_pm_suspend(void)
{
struct irq_grp_save *grp = eint_grp_save;
int i;
S3C_PMDBG("%s: suspending IRQs\n", __func__);
s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
for (i = 0; i < 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 void s3c64xx_irq_pm_resume(void)
{
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));
for (i = 0; i < 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__);
}
static struct syscore_ops s3c64xx_irq_syscore_ops = {
.suspend = s3c64xx_irq_pm_suspend,
.resume = s3c64xx_irq_pm_resume,
};
static __init int s3c64xx_syscore_init(void)
{
/* Appropriate drivers (pinctrl, uart) handle this when using DT. */
if (of_have_populated_dt() || !soc_is_s3c64xx())
return 0;
register_syscore_ops(&s3c64xx_irq_syscore_ops);
return 0;
}
core_initcall(s3c64xx_syscore_init);
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