// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2010 DENX Software Engineering
 *
 * Anatolij Gustschin, <agust@denx.de>
 *
 * PDM360NG board setup
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_fdt.h>

#include <asm/machdep.h>
#include <asm/ipic.h>

#include "mpc512x.h"

#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
#include <linux/interrupt.h>
#include <linux/spi/ads7846.h>
#include <linux/spi/spi.h>
#include <linux/notifier.h>

static void *pdm360ng_gpio_base;

static int pdm360ng_get_pendown_state(void)
{
        u32 reg;

        reg = in_be32(pdm360ng_gpio_base + 0xc);
        if (reg & 0x40)
                setbits32(pdm360ng_gpio_base + 0xc, 0x40);

        reg = in_be32(pdm360ng_gpio_base + 0x8);

        /* return 1 if pen is down */
        return (reg & 0x40) == 0;
}

static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
        .model                  = 7845,
        .get_pendown_state      = pdm360ng_get_pendown_state,
        .irq_flags              = IRQF_TRIGGER_LOW,
};

static int __init pdm360ng_penirq_init(void)
{
        struct device_node *np;

        np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
        if (!np) {
                pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
                return -ENODEV;
        }

        pdm360ng_gpio_base = of_iomap(np, 0);
        of_node_put(np);
        if (!pdm360ng_gpio_base) {
                pr_err("%s: Can't map gpio regs.\n", __func__);
                return -ENODEV;
        }
        out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
        setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
        setbits32(pdm360ng_gpio_base + 0x10, 0x40);

        return 0;
}

static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
                                        unsigned long event, void *__dev)
{
        struct device *dev = __dev;

        if ((event == BUS_NOTIFY_ADD_DEVICE) &&
            of_device_is_compatible(dev->of_node, "ti,ads7846")) {
                dev->platform_data = &pdm360ng_ads7846_pdata;
                return NOTIFY_OK;
        }
        return NOTIFY_DONE;
}

static struct notifier_block pdm360ng_touchscreen_nb = {
        .notifier_call = pdm360ng_touchscreen_notifier_call,
};

static void __init pdm360ng_touchscreen_init(void)
{
        if (pdm360ng_penirq_init())
                return;

        bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
}
#else
static inline void __init pdm360ng_touchscreen_init(void)
{
}
#endif /* CONFIG_TOUCHSCREEN_ADS7846 */

static void __init pdm360ng_init(void)
{
        mpc512x_init();
        pdm360ng_touchscreen_init();
}

static int __init pdm360ng_probe(void)
{
        mpc512x_init_early();

        return 1;
}

define_machine(pdm360ng) {
        .name                   = "PDM360NG",
        .compatible             = "ifm,pdm360ng",
        .probe                  = pdm360ng_probe,
        .setup_arch             = mpc512x_setup_arch,
        .init                   = pdm360ng_init,
        .init_IRQ               = mpc512x_init_IRQ,
        .get_irq                = ipic_get_irq,
        .restart                = mpc512x_restart,
};