// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/boards/renesas/r7780rp/psw.c
 *
 * push switch support for RDBRP-1/RDBREVRP-1 debug boards.
 *
 * Copyright (C) 2006  Paul Mundt
 */
#include <linux/io.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <mach/highlander.h>
#include <asm/push-switch.h>

static irqreturn_t psw_irq_handler(int irq, void *arg)
{
        struct platform_device *pdev = arg;
        struct push_switch *psw = platform_get_drvdata(pdev);
        struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
        unsigned int l, mask;
        int ret = 0;

        l = __raw_readw(PA_DBSW);

        /* Nothing to do if there's no state change */
        if (psw->state) {
                ret = 1;
                goto out;
        }

        mask = l & 0x70;
        /* Figure out who raised it */
        if (mask & (1 << psw_info->bit)) {
                psw->state = !!(mask & (1 << psw_info->bit));
                if (psw->state) /* debounce */
                        mod_timer(&psw->debounce, jiffies + 50);

                ret = 1;
        }

out:
        /* Clear the switch IRQs */
        l |= (0x7 << 12);
        __raw_writew(l, PA_DBSW);

        return IRQ_RETVAL(ret);
}

static struct resource psw_resources[] = {
        [0] = {
                .start  = IRQ_PSW,
                .flags  = IORESOURCE_IRQ,
        },
};

static struct push_switch_platform_info s2_platform_data = {
        .name           = "s2",
        .bit            = 6,
        .irq_flags      = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
                          IRQF_SHARED,
        .irq_handler    = psw_irq_handler,
};

static struct platform_device s2_switch_device = {
        .name           = "push-switch",
        .id             = 0,
        .num_resources  = ARRAY_SIZE(psw_resources),
        .resource       = psw_resources,
        .dev            = {
                .platform_data = &s2_platform_data,
        },
};

static struct push_switch_platform_info s3_platform_data = {
        .name           = "s3",
        .bit            = 5,
        .irq_flags      = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
                          IRQF_SHARED,
        .irq_handler    = psw_irq_handler,
};

static struct platform_device s3_switch_device = {
        .name           = "push-switch",
        .id             = 1,
        .num_resources  = ARRAY_SIZE(psw_resources),
        .resource       = psw_resources,
        .dev            = {
                .platform_data = &s3_platform_data,
        },
};

static struct push_switch_platform_info s4_platform_data = {
        .name           = "s4",
        .bit            = 4,
        .irq_flags      = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
                          IRQF_SHARED,
        .irq_handler    = psw_irq_handler,
};

static struct platform_device s4_switch_device = {
        .name           = "push-switch",
        .id             = 2,
        .num_resources  = ARRAY_SIZE(psw_resources),
        .resource       = psw_resources,
        .dev            = {
                .platform_data = &s4_platform_data,
        },
};

static struct platform_device *psw_devices[] = {
        &s2_switch_device, &s3_switch_device, &s4_switch_device,
};

static int __init psw_init(void)
{
        return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
}
module_init(psw_init);