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};
127