// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright 2008 Openmoko, Inc.
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// Copyright 2008 Simtec Electronics
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// Ben Dooks <ben@simtec.co.uk>
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// http://armlinux.simtec.co.uk/
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//
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// S3C64XX - Interrupt handling Power Management
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/*
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* NOTE: Code in this file is not used when booting with Device Tree support.
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*/
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#include <linux/kernel.h>
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#include <linux/syscore_ops.h>
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#include <linux/interrupt.h>
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#include <linux/serial_core.h>
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#include <linux/serial_s3c.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include "map.h"
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#include "regs-gpio.h"
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#include "cpu.h"
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#include "pm.h"
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/* We handled all the IRQ types in this code, to save having to make several
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* small files to handle each different type separately. Having the EINT_GRP
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* code here shouldn't be as much bloat as the IRQ table space needed when
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* they are enabled. The added benefit is we ensure that these registers are
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* in the same state as we suspended.
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*/
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static struct sleep_save irq_save[] = {
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SAVE_ITEM(S3C64XX_PRIORITY),
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SAVE_ITEM(S3C64XX_EINT0CON0),
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SAVE_ITEM(S3C64XX_EINT0CON1),
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SAVE_ITEM(S3C64XX_EINT0FLTCON0),
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SAVE_ITEM(S3C64XX_EINT0FLTCON1),
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SAVE_ITEM(S3C64XX_EINT0FLTCON2),
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SAVE_ITEM(S3C64XX_EINT0FLTCON3),
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SAVE_ITEM(S3C64XX_EINT0MASK),
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};
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static struct irq_grp_save {
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u32 fltcon;
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u32 con;
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u32 mask;
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} eint_grp_save[5];
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#ifndef CONFIG_SERIAL_SAMSUNG_UARTS
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#define SERIAL_SAMSUNG_UARTS 0
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#else
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#define SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
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#endif
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static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
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static int s3c64xx_irq_pm_suspend(void)
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{
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struct irq_grp_save *grp = eint_grp_save;
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int i;
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S3C_PMDBG("%s: suspending IRQs\n", __func__);
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s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
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for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
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irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
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for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
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grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
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grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
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grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
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}
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return 0;
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}
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static void s3c64xx_irq_pm_resume(void)
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{
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struct irq_grp_save *grp = eint_grp_save;
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int i;
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S3C_PMDBG("%s: resuming IRQs\n", __func__);
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s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
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for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
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__raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
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for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
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__raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
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__raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
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__raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
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}
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S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
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}
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static struct syscore_ops s3c64xx_irq_syscore_ops = {
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.suspend = s3c64xx_irq_pm_suspend,
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.resume = s3c64xx_irq_pm_resume,
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};
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static __init int s3c64xx_syscore_init(void)
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{
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/* Appropriate drivers (pinctrl, uart) handle this when using DT. */
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if (of_have_populated_dt() || !soc_is_s3c64xx())
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return 0;
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register_syscore_ops(&s3c64xx_irq_syscore_ops);
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return 0;
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}
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core_initcall(s3c64xx_syscore_init);
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