pdm360ng.c

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/*
 * Copyright (C) 2010 DENX Software Engineering
 *
 * Anatolij Gustschin, <[email protected]>
 *
 * PDM360NG board setup
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/of_platform.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 */

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

static int __init pdm360ng_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    return of_flat_dt_is_compatible(root, "ifm,pdm360ng");
}

define_machine(pdm360ng) {
    .name           = "PDM360NG",
    .probe          = pdm360ng_probe,
    .setup_arch     = mpc512x_setup_diu,
    .init           = pdm360ng_init,
    .init_early     = mpc512x_init_diu,
    .init_IRQ       = mpc512x_init_IRQ,
    .get_irq        = ipic_get_irq,
    .calibrate_decr     = generic_calibrate_decr,
    .restart        = mpc512x_restart,
};