1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * arch/sh/boards/renesas/r7780rp/psw.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * push switch support for RDBRP-1/RDBREVRP-1 debug boards.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (C) 2006 Paul Mundt
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun #include <linux/io.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/interrupt.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun #include <mach/highlander.h>
14*4882a593Smuzhiyun #include <asm/push-switch.h>
15*4882a593Smuzhiyun
psw_irq_handler(int irq,void * arg)16*4882a593Smuzhiyun static irqreturn_t psw_irq_handler(int irq, void *arg)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct platform_device *pdev = arg;
19*4882a593Smuzhiyun struct push_switch *psw = platform_get_drvdata(pdev);
20*4882a593Smuzhiyun struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
21*4882a593Smuzhiyun unsigned int l, mask;
22*4882a593Smuzhiyun int ret = 0;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun l = __raw_readw(PA_DBSW);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /* Nothing to do if there's no state change */
27*4882a593Smuzhiyun if (psw->state) {
28*4882a593Smuzhiyun ret = 1;
29*4882a593Smuzhiyun goto out;
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun mask = l & 0x70;
33*4882a593Smuzhiyun /* Figure out who raised it */
34*4882a593Smuzhiyun if (mask & (1 << psw_info->bit)) {
35*4882a593Smuzhiyun psw->state = !!(mask & (1 << psw_info->bit));
36*4882a593Smuzhiyun if (psw->state) /* debounce */
37*4882a593Smuzhiyun mod_timer(&psw->debounce, jiffies + 50);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun ret = 1;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun out:
43*4882a593Smuzhiyun /* Clear the switch IRQs */
44*4882a593Smuzhiyun l |= (0x7 << 12);
45*4882a593Smuzhiyun __raw_writew(l, PA_DBSW);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun return IRQ_RETVAL(ret);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun static struct resource psw_resources[] = {
51*4882a593Smuzhiyun [0] = {
52*4882a593Smuzhiyun .start = IRQ_PSW,
53*4882a593Smuzhiyun .flags = IORESOURCE_IRQ,
54*4882a593Smuzhiyun },
55*4882a593Smuzhiyun };
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun static struct push_switch_platform_info s2_platform_data = {
58*4882a593Smuzhiyun .name = "s2",
59*4882a593Smuzhiyun .bit = 6,
60*4882a593Smuzhiyun .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
61*4882a593Smuzhiyun IRQF_SHARED,
62*4882a593Smuzhiyun .irq_handler = psw_irq_handler,
63*4882a593Smuzhiyun };
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun static struct platform_device s2_switch_device = {
66*4882a593Smuzhiyun .name = "push-switch",
67*4882a593Smuzhiyun .id = 0,
68*4882a593Smuzhiyun .num_resources = ARRAY_SIZE(psw_resources),
69*4882a593Smuzhiyun .resource = psw_resources,
70*4882a593Smuzhiyun .dev = {
71*4882a593Smuzhiyun .platform_data = &s2_platform_data,
72*4882a593Smuzhiyun },
73*4882a593Smuzhiyun };
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun static struct push_switch_platform_info s3_platform_data = {
76*4882a593Smuzhiyun .name = "s3",
77*4882a593Smuzhiyun .bit = 5,
78*4882a593Smuzhiyun .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
79*4882a593Smuzhiyun IRQF_SHARED,
80*4882a593Smuzhiyun .irq_handler = psw_irq_handler,
81*4882a593Smuzhiyun };
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun static struct platform_device s3_switch_device = {
84*4882a593Smuzhiyun .name = "push-switch",
85*4882a593Smuzhiyun .id = 1,
86*4882a593Smuzhiyun .num_resources = ARRAY_SIZE(psw_resources),
87*4882a593Smuzhiyun .resource = psw_resources,
88*4882a593Smuzhiyun .dev = {
89*4882a593Smuzhiyun .platform_data = &s3_platform_data,
90*4882a593Smuzhiyun },
91*4882a593Smuzhiyun };
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun static struct push_switch_platform_info s4_platform_data = {
94*4882a593Smuzhiyun .name = "s4",
95*4882a593Smuzhiyun .bit = 4,
96*4882a593Smuzhiyun .irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
97*4882a593Smuzhiyun IRQF_SHARED,
98*4882a593Smuzhiyun .irq_handler = psw_irq_handler,
99*4882a593Smuzhiyun };
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun static struct platform_device s4_switch_device = {
102*4882a593Smuzhiyun .name = "push-switch",
103*4882a593Smuzhiyun .id = 2,
104*4882a593Smuzhiyun .num_resources = ARRAY_SIZE(psw_resources),
105*4882a593Smuzhiyun .resource = psw_resources,
106*4882a593Smuzhiyun .dev = {
107*4882a593Smuzhiyun .platform_data = &s4_platform_data,
108*4882a593Smuzhiyun },
109*4882a593Smuzhiyun };
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun static struct platform_device *psw_devices[] = {
112*4882a593Smuzhiyun &s2_switch_device, &s3_switch_device, &s4_switch_device,
113*4882a593Smuzhiyun };
114*4882a593Smuzhiyun
psw_init(void)115*4882a593Smuzhiyun static int __init psw_init(void)
116*4882a593Smuzhiyun {
117*4882a593Smuzhiyun return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun module_init(psw_init);
120