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/*
* Copyright (C) 2010 DENX Software Engineering
*
* Anatolij Gustschin, <agust@denx.de>
*
* 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_arch,
.init = pdm360ng_init,
.init_early = mpc512x_init_early,
.init_IRQ = mpc512x_init_IRQ,
.get_irq = ipic_get_irq,
.calibrate_decr = generic_calibrate_decr,
.restart = mpc512x_restart,
};
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