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/kernel.h>
11#include <linux/io.h>
12#include <linux/of_address.h>
13#include <linux/of_fdt.h>
14#include <linux/of_platform.h>
15
16#include <asm/machdep.h>
17#include <asm/ipic.h>
18
19#include "mpc512x.h"
20
21#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
22    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
23#include <linux/interrupt.h>
24#include <linux/spi/ads7846.h>
25#include <linux/spi/spi.h>
26#include <linux/notifier.h>
27
28static void *pdm360ng_gpio_base;
29
30static int pdm360ng_get_pendown_state(void)
31{
32	u32 reg;
33
34	reg = in_be32(pdm360ng_gpio_base + 0xc);
35	if (reg & 0x40)
36		setbits32(pdm360ng_gpio_base + 0xc, 0x40);
37
38	reg = in_be32(pdm360ng_gpio_base + 0x8);
39
40	/* return 1 if pen is down */
41	return (reg & 0x40) == 0;
42}
43
44static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
45	.model			= 7845,
46	.get_pendown_state	= pdm360ng_get_pendown_state,
47	.irq_flags		= IRQF_TRIGGER_LOW,
48};
49
50static int __init pdm360ng_penirq_init(void)
51{
52	struct device_node *np;
53
54	np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
55	if (!np) {
56		pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
57		return -ENODEV;
58	}
59
60	pdm360ng_gpio_base = of_iomap(np, 0);
61	of_node_put(np);
62	if (!pdm360ng_gpio_base) {
63		pr_err("%s: Can't map gpio regs.\n", __func__);
64		return -ENODEV;
65	}
66	out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
67	setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
68	setbits32(pdm360ng_gpio_base + 0x10, 0x40);
69
70	return 0;
71}
72
73static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
74					unsigned long event, void *__dev)
75{
76	struct device *dev = __dev;
77
78	if ((event == BUS_NOTIFY_ADD_DEVICE) &&
79	    of_device_is_compatible(dev->of_node, "ti,ads7846")) {
80		dev->platform_data = &pdm360ng_ads7846_pdata;
81		return NOTIFY_OK;
82	}
83	return NOTIFY_DONE;
84}
85
86static struct notifier_block pdm360ng_touchscreen_nb = {
87	.notifier_call = pdm360ng_touchscreen_notifier_call,
88};
89
90static void __init pdm360ng_touchscreen_init(void)
91{
92	if (pdm360ng_penirq_init())
93		return;
94
95	bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
96}
97#else
98static inline void __init pdm360ng_touchscreen_init(void)
99{
100}
101#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
102
103void __init pdm360ng_init(void)
104{
105	mpc512x_init();
106	pdm360ng_touchscreen_init();
107}
108
109static int __init pdm360ng_probe(void)
110{
111	if (!of_machine_is_compatible("ifm,pdm360ng"))
112		return 0;
113
114	mpc512x_init_early();
115
116	return 1;
117}
118
119define_machine(pdm360ng) {
120	.name			= "PDM360NG",
121	.probe			= pdm360ng_probe,
122	.setup_arch		= mpc512x_setup_arch,
123	.init			= pdm360ng_init,
124	.init_IRQ		= mpc512x_init_IRQ,
125	.get_irq		= ipic_get_irq,
126	.calibrate_decr		= generic_calibrate_decr,
127	.restart		= mpc512x_restart,
128};
129