1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2010 DENX Software Engineering
4 *
5 * Anatolij Gustschin, <agust@denx.de>
6 *
7 * PDM360NG board setup
8 */
9
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/io.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/of_fdt.h>
16
17 #include <asm/machdep.h>
18 #include <asm/ipic.h>
19
20 #include "mpc512x.h"
21
22 #if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
23 defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
24 #include <linux/interrupt.h>
25 #include <linux/spi/ads7846.h>
26 #include <linux/spi/spi.h>
27 #include <linux/notifier.h>
28
29 static void *pdm360ng_gpio_base;
30
31 static int pdm360ng_get_pendown_state(void)
32 {
33 u32 reg;
34
35 reg = in_be32(pdm360ng_gpio_base + 0xc);
36 if (reg & 0x40)
37 setbits32(pdm360ng_gpio_base + 0xc, 0x40);
38
39 reg = in_be32(pdm360ng_gpio_base + 0x8);
40
41 /* return 1 if pen is down */
42 return (reg & 0x40) == 0;
43 }
44
45 static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
46 .model = 7845,
47 .get_pendown_state = pdm360ng_get_pendown_state,
48 .irq_flags = IRQF_TRIGGER_LOW,
49 };
50
51 static int __init pdm360ng_penirq_init(void)
52 {
53 struct device_node *np;
54
55 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
56 if (!np) {
57 pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
58 return -ENODEV;
59 }
60
61 pdm360ng_gpio_base = of_iomap(np, 0);
62 of_node_put(np);
63 if (!pdm360ng_gpio_base) {
64 pr_err("%s: Can't map gpio regs.\n", __func__);
65 return -ENODEV;
66 }
67 out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
68 setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
69 setbits32(pdm360ng_gpio_base + 0x10, 0x40);
70
71 return 0;
72 }
73
74 static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
75 unsigned long event, void *__dev)
76 {
77 struct device *dev = __dev;
78
79 if ((event == BUS_NOTIFY_ADD_DEVICE) &&
80 of_device_is_compatible(dev->of_node, "ti,ads7846")) {
81 dev->platform_data = &pdm360ng_ads7846_pdata;
82 return NOTIFY_OK;
83 }
84 return NOTIFY_DONE;
85 }
86
87 static struct notifier_block pdm360ng_touchscreen_nb = {
88 .notifier_call = pdm360ng_touchscreen_notifier_call,
89 };
90
91 static void __init pdm360ng_touchscreen_init(void)
92 {
93 if (pdm360ng_penirq_init())
94 return;
95
96 bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
97 }
98 #else
99 static inline void __init pdm360ng_touchscreen_init(void)
100 {
101 }
102 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
103
104 static void __init pdm360ng_init(void)
105 {
106 mpc512x_init();
107 pdm360ng_touchscreen_init();
108 }
109
110 static int __init pdm360ng_probe(void)
111 {
112 mpc512x_init_early();
113
114 return 1;
115 }
116
117 define_machine(pdm360ng) {
118 .name = "PDM360NG",
119 .compatible = "ifm,pdm360ng",
120 .probe = pdm360ng_probe,
121 .setup_arch = mpc512x_setup_arch,
122 .init = pdm360ng_init,
123 .init_IRQ = mpc512x_init_IRQ,
124 .get_irq = ipic_get_irq,
125 .restart = mpc512x_restart,
126 };
127
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.