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 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