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
pdm360ng_get_pendown_state(void)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
pdm360ng_penirq_init(void)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
pdm360ng_touchscreen_notifier_call(struct notifier_block * nb,unsigned long event,void * __dev)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
pdm360ng_touchscreen_init(void)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
pdm360ng_touchscreen_init(void)101 static inline void __init pdm360ng_touchscreen_init(void)
102 {
103 }
104 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
105
pdm360ng_init(void)106 void __init pdm360ng_init(void)
107 {
108 mpc512x_init();
109 pdm360ng_touchscreen_init();
110 }
111
pdm360ng_probe(void)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
define_machine(pdm360ng)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