summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/512x/pdm360ng.c
blob: dc81f05e0bce436d862a24a07caa60473d79f0ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/*
 * 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_address.h>
#include <linux/of_fdt.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)
{
	if (!of_machine_is_compatible("ifm,pdm360ng"))
		return 0;

	mpc512x_init_early();

	return 1;
}

define_machine(pdm360ng) {
	.name			= "PDM360NG",
	.probe			= pdm360ng_probe,
	.setup_arch		= mpc512x_setup_arch,
	.init			= pdm360ng_init,
	.init_IRQ		= mpc512x_init_IRQ,
	.get_irq		= ipic_get_irq,
	.calibrate_decr		= generic_calibrate_decr,
	.restart		= mpc512x_restart,
};