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