1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/sh/boards/renesas/r7780rp/psw.c
4 *
5 * push switch support for RDBRP-1/RDBREVRP-1 debug boards.
6 *
7 * Copyright (C) 2006  Paul Mundt
8 */
9#include <linux/io.h>
10#include <linux/module.h>
11#include <linux/interrupt.h>
12#include <linux/platform_device.h>
13#include <mach/highlander.h>
14#include <asm/push-switch.h>
15
16static irqreturn_t psw_irq_handler(int irq, void *arg)
17{
18	struct platform_device *pdev = arg;
19	struct push_switch *psw = platform_get_drvdata(pdev);
20	struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
21	unsigned int l, mask;
22	int ret = 0;
23
24	l = __raw_readw(PA_DBSW);
25
26	/* Nothing to do if there's no state change */
27	if (psw->state) {
28		ret = 1;
29		goto out;
30	}
31
32	mask = l & 0x70;
33	/* Figure out who raised it */
34	if (mask & (1 << psw_info->bit)) {
35		psw->state = !!(mask & (1 << psw_info->bit));
36		if (psw->state)	/* debounce */
37			mod_timer(&psw->debounce, jiffies + 50);
38
39		ret = 1;
40	}
41
42out:
43	/* Clear the switch IRQs */
44	l |= (0x7 << 12);
45	__raw_writew(l, PA_DBSW);
46
47	return IRQ_RETVAL(ret);
48}
49
50static struct resource psw_resources[] = {
51	[0] = {
52		.start	= IRQ_PSW,
53		.flags	= IORESOURCE_IRQ,
54	},
55};
56
57static struct push_switch_platform_info s2_platform_data = {
58	.name		= "s2",
59	.bit		= 6,
60	.irq_flags	= IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
61			  IRQF_SHARED,
62	.irq_handler	= psw_irq_handler,
63};
64
65static struct platform_device s2_switch_device = {
66	.name		= "push-switch",
67	.id		= 0,
68	.num_resources	= ARRAY_SIZE(psw_resources),
69	.resource	= psw_resources,
70	.dev		= {
71		.platform_data = &s2_platform_data,
72	},
73};
74
75static struct push_switch_platform_info s3_platform_data = {
76	.name		= "s3",
77	.bit		= 5,
78	.irq_flags	= IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
79			  IRQF_SHARED,
80	.irq_handler	= psw_irq_handler,
81};
82
83static struct platform_device s3_switch_device = {
84	.name		= "push-switch",
85	.id		= 1,
86	.num_resources	= ARRAY_SIZE(psw_resources),
87	.resource	= psw_resources,
88	.dev		= {
89		.platform_data = &s3_platform_data,
90	},
91};
92
93static struct push_switch_platform_info s4_platform_data = {
94	.name		= "s4",
95	.bit		= 4,
96	.irq_flags	= IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
97			  IRQF_SHARED,
98	.irq_handler	= psw_irq_handler,
99};
100
101static struct platform_device s4_switch_device = {
102	.name		= "push-switch",
103	.id		= 2,
104	.num_resources	= ARRAY_SIZE(psw_resources),
105	.resource	= psw_resources,
106	.dev		= {
107		.platform_data = &s4_platform_data,
108	},
109};
110
111static struct platform_device *psw_devices[] = {
112	&s2_switch_device, &s3_switch_device, &s4_switch_device,
113};
114
115static int __init psw_init(void)
116{
117	return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
118}
119module_init(psw_init);
120