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_platform.h>
18 
19 #include <asm/machdep.h>
20 #include <asm/ipic.h>
21 
22 #include "mpc512x.h"
23 
24 #if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
25     defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
26 #include <linux/interrupt.h>
27 #include <linux/spi/ads7846.h>
28 #include <linux/spi/spi.h>
29 #include <linux/notifier.h>
30 
31 static void *pdm360ng_gpio_base;
32 
33 static int pdm360ng_get_pendown_state(void)
34 {
35 	u32 reg;
36 
37 	reg = in_be32(pdm360ng_gpio_base + 0xc);
38 	if (reg & 0x40)
39 		setbits32(pdm360ng_gpio_base + 0xc, 0x40);
40 
41 	reg = in_be32(pdm360ng_gpio_base + 0x8);
42 
43 	/* return 1 if pen is down */
44 	return (reg & 0x40) == 0;
45 }
46 
47 static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
48 	.model			= 7845,
49 	.get_pendown_state	= pdm360ng_get_pendown_state,
50 	.irq_flags		= IRQF_TRIGGER_LOW,
51 };
52 
53 static int __init pdm360ng_penirq_init(void)
54 {
55 	struct device_node *np;
56 
57 	np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
58 	if (!np) {
59 		pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
60 		return -ENODEV;
61 	}
62 
63 	pdm360ng_gpio_base = of_iomap(np, 0);
64 	of_node_put(np);
65 	if (!pdm360ng_gpio_base) {
66 		pr_err("%s: Can't map gpio regs.\n", __func__);
67 		return -ENODEV;
68 	}
69 	out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
70 	setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
71 	setbits32(pdm360ng_gpio_base + 0x10, 0x40);
72 
73 	return 0;
74 }
75 
76 static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
77 					unsigned long event, void *__dev)
78 {
79 	struct device *dev = __dev;
80 
81 	if ((event == BUS_NOTIFY_ADD_DEVICE) &&
82 	    of_device_is_compatible(dev->of_node, "ti,ads7846")) {
83 		dev->platform_data = &pdm360ng_ads7846_pdata;
84 		return NOTIFY_OK;
85 	}
86 	return NOTIFY_DONE;
87 }
88 
89 static struct notifier_block pdm360ng_touchscreen_nb = {
90 	.notifier_call = pdm360ng_touchscreen_notifier_call,
91 };
92 
93 static void __init pdm360ng_touchscreen_init(void)
94 {
95 	if (pdm360ng_penirq_init())
96 		return;
97 
98 	bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
99 }
100 #else
101 static inline void __init pdm360ng_touchscreen_init(void)
102 {
103 }
104 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
105 
106 void __init pdm360ng_init(void)
107 {
108 	mpc512x_init();
109 	pdm360ng_touchscreen_init();
110 }
111 
112 static int __init pdm360ng_probe(void)
113 {
114 	unsigned long root = of_get_flat_dt_root();
115 
116 	return of_flat_dt_is_compatible(root, "ifm,pdm360ng");
117 }
118 
119 define_machine(pdm360ng) {
120 	.name			= "PDM360NG",
121 	.probe			= pdm360ng_probe,
122 	.setup_arch		= mpc512x_setup_diu,
123 	.init			= pdm360ng_init,
124 	.init_early		= mpc512x_init_diu,
125 	.init_IRQ		= mpc512x_init_IRQ,
126 	.get_irq		= ipic_get_irq,
127 	.calibrate_decr		= generic_calibrate_decr,
128 	.restart		= mpc512x_restart,
129 };
130