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 
33 static void *pdm360ng_gpio_base;
34 
35 static 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 
49 static 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 
55 static 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 
78 static 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 
91 static struct notifier_block pdm360ng_touchscreen_nb = {
92 	.notifier_call = pdm360ng_touchscreen_notifier_call,
93 };
94 
95 static 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
103 static inline void __init pdm360ng_touchscreen_init(void)
104 {
105 }
106 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
107 
108 void __init pdm360ng_init(void)
109 {
110 	mpc512x_init();
111 	pdm360ng_touchscreen_init();
112 }
113 
114 static 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 
121 define_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