1/*
2 * Copyright (C) 2010 DENX Software Engineering
3 *
4 * Anatolij Gustschin, <agust@denx.de>
5 *
6 * PDM360NG board setup
7 *
8 * This is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/io.h>
17#include <linux/of_address.h>
18#include <linux/of_fdt.h>
19#include <linux/of_platform.h>
20
21#include <asm/machdep.h>
22#include <asm/ipic.h>
23
24#include "mpc512x.h"
25
26#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
27    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
28#include <linux/interrupt.h>
29#include <linux/spi/ads7846.h>
30#include <linux/spi/spi.h>
31#include <linux/notifier.h>
32
33static void *pdm360ng_gpio_base;
34
35static int pdm360ng_get_pendown_state(void)
36{
37	u32 reg;
38
39	reg = in_be32(pdm360ng_gpio_base + 0xc);
40	if (reg & 0x40)
41		setbits32(pdm360ng_gpio_base + 0xc, 0x40);
42
43	reg = in_be32(pdm360ng_gpio_base + 0x8);
44
45	/* return 1 if pen is down */
46	return (reg & 0x40) == 0;
47}
48
49static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
50	.model			= 7845,
51	.get_pendown_state	= pdm360ng_get_pendown_state,
52	.irq_flags		= IRQF_TRIGGER_LOW,
53};
54
55static int __init pdm360ng_penirq_init(void)
56{
57	struct device_node *np;
58
59	np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
60	if (!np) {
61		pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
62		return -ENODEV;
63	}
64
65	pdm360ng_gpio_base = of_iomap(np, 0);
66	of_node_put(np);
67	if (!pdm360ng_gpio_base) {
68		pr_err("%s: Can't map gpio regs.\n", __func__);
69		return -ENODEV;
70	}
71	out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
72	setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
73	setbits32(pdm360ng_gpio_base + 0x10, 0x40);
74
75	return 0;
76}
77
78static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
79					unsigned long event, void *__dev)
80{
81	struct device *dev = __dev;
82
83	if ((event == BUS_NOTIFY_ADD_DEVICE) &&
84	    of_device_is_compatible(dev->of_node, "ti,ads7846")) {
85		dev->platform_data = &pdm360ng_ads7846_pdata;
86		return NOTIFY_OK;
87	}
88	return NOTIFY_DONE;
89}
90
91static struct notifier_block pdm360ng_touchscreen_nb = {
92	.notifier_call = pdm360ng_touchscreen_notifier_call,
93};
94
95static void __init pdm360ng_touchscreen_init(void)
96{
97	if (pdm360ng_penirq_init())
98		return;
99
100	bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
101}
102#else
103static inline void __init pdm360ng_touchscreen_init(void)
104{
105}
106#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
107
108void __init pdm360ng_init(void)
109{
110	mpc512x_init();
111	pdm360ng_touchscreen_init();
112}
113
114static int __init pdm360ng_probe(void)
115{
116	unsigned long root = of_get_flat_dt_root();
117
118	return of_flat_dt_is_compatible(root, "ifm,pdm360ng");
119}
120
121define_machine(pdm360ng) {
122	.name			= "PDM360NG",
123	.probe			= pdm360ng_probe,
124	.setup_arch		= mpc512x_setup_arch,
125	.init			= pdm360ng_init,
126	.init_early		= mpc512x_init_early,
127	.init_IRQ		= mpc512x_init_IRQ,
128	.get_irq		= ipic_get_irq,
129	.calibrate_decr		= generic_calibrate_decr,
130	.restart		= mpc512x_restart,
131};
132