pdm360ng.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (C) 2010 DENX Software Engineering
  4 *
  5 * Anatolij Gustschin, <agust@denx.de>
  6 *
  7 * PDM360NG board setup
  8 */
  9
 10#include <linux/device.h>
 11#include <linux/kernel.h>
 12#include <linux/io.h>
 13#include <linux/of.h>
 14#include <linux/of_address.h>
 15#include <linux/of_fdt.h>
 16
 17#include <asm/machdep.h>
 18#include <asm/ipic.h>
 19
 20#include "mpc512x.h"
 21
 22#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
 23    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
 24#include <linux/interrupt.h>
 25#include <linux/spi/ads7846.h>
 26#include <linux/spi/spi.h>
 27#include <linux/notifier.h>
 28
 29static void *pdm360ng_gpio_base;
 30
 31static int pdm360ng_get_pendown_state(void)
 32{
 33	u32 reg;
 34
 35	reg = in_be32(pdm360ng_gpio_base + 0xc);
 36	if (reg & 0x40)
 37		setbits32(pdm360ng_gpio_base + 0xc, 0x40);
 38
 39	reg = in_be32(pdm360ng_gpio_base + 0x8);
 40
 41	/* return 1 if pen is down */
 42	return (reg & 0x40) == 0;
 43}
 44
 45static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
 46	.model			= 7845,
 47	.get_pendown_state	= pdm360ng_get_pendown_state,
 48	.irq_flags		= IRQF_TRIGGER_LOW,
 49};
 50
 51static int __init pdm360ng_penirq_init(void)
 52{
 53	struct device_node *np;
 54
 55	np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
 56	if (!np) {
 57		pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
 58		return -ENODEV;
 59	}
 60
 61	pdm360ng_gpio_base = of_iomap(np, 0);
 62	of_node_put(np);
 63	if (!pdm360ng_gpio_base) {
 64		pr_err("%s: Can't map gpio regs.\n", __func__);
 65		return -ENODEV;
 66	}
 67	out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
 68	setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
 69	setbits32(pdm360ng_gpio_base + 0x10, 0x40);
 70
 71	return 0;
 72}
 73
 74static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
 75					unsigned long event, void *__dev)
 76{
 77	struct device *dev = __dev;
 78
 79	if ((event == BUS_NOTIFY_ADD_DEVICE) &&
 80	    of_device_is_compatible(dev->of_node, "ti,ads7846")) {
 81		dev->platform_data = &pdm360ng_ads7846_pdata;
 82		return NOTIFY_OK;
 83	}
 84	return NOTIFY_DONE;
 85}
 86
 87static struct notifier_block pdm360ng_touchscreen_nb = {
 88	.notifier_call = pdm360ng_touchscreen_notifier_call,
 89};
 90
 91static void __init pdm360ng_touchscreen_init(void)
 92{
 93	if (pdm360ng_penirq_init())
 94		return;
 95
 96	bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
 97}
 98#else
 99static inline void __init pdm360ng_touchscreen_init(void)
100{
101}
102#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
103
104static void __init pdm360ng_init(void)
105{
106	mpc512x_init();
107	pdm360ng_touchscreen_init();
108}
109
110static int __init pdm360ng_probe(void)
111{
112	mpc512x_init_early();
113
114	return 1;
115}
116
117define_machine(pdm360ng) {
118	.name			= "PDM360NG",
119	.compatible		= "ifm,pdm360ng",
120	.probe			= pdm360ng_probe,
121	.setup_arch		= mpc512x_setup_arch,
122	.init			= pdm360ng_init,
123	.init_IRQ		= mpc512x_init_IRQ,
124	.get_irq		= ipic_get_irq,
125	.restart		= mpc512x_restart,
126};