1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * System Specific setup for Soekris net5501
4 * At the moment this means setup of GPIO control of LEDs and buttons
5 * on net5501 boards.
6 *
7 * Copyright (C) 2008-2009 Tower Technologies
8 * Written by Alessandro Zummo <a.zummo@towertech.it>
9 *
10 * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
11 * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
12 *                and Philip Prindeville <philipp@redfish-solutions.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/io.h>
18#include <linux/string.h>
19#include <linux/leds.h>
20#include <linux/platform_device.h>
21#include <linux/input.h>
22#include <linux/gpio_keys.h>
23
24#include <asm/geode.h>
25
26#define BIOS_REGION_BASE		0xffff0000
27#define BIOS_REGION_SIZE		0x00010000
28
29static struct gpio_keys_button net5501_gpio_buttons[] = {
30	{
31		.code = KEY_RESTART,
32		.gpio = 24,
33		.active_low = 1,
34		.desc = "Reset button",
35		.type = EV_KEY,
36		.wakeup = 0,
37		.debounce_interval = 100,
38		.can_disable = 0,
39	}
40};
41static struct gpio_keys_platform_data net5501_buttons_data = {
42	.buttons = net5501_gpio_buttons,
43	.nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
44	.poll_interval = 20,
45};
46
47static struct platform_device net5501_buttons_dev = {
48	.name = "gpio-keys-polled",
49	.id = 1,
50	.dev = {
51		.platform_data = &net5501_buttons_data,
52	}
53};
54
55static struct gpio_led net5501_leds[] = {
56	{
57		.name = "net5501:1",
58		.gpio = 6,
59		.default_trigger = "default-on",
60		.active_low = 0,
61	},
62};
63
64static struct gpio_led_platform_data net5501_leds_data = {
65	.num_leds = ARRAY_SIZE(net5501_leds),
66	.leds = net5501_leds,
67};
68
69static struct platform_device net5501_leds_dev = {
70	.name = "leds-gpio",
71	.id = -1,
72	.dev.platform_data = &net5501_leds_data,
73};
74
75static struct platform_device *net5501_devs[] __initdata = {
76	&net5501_buttons_dev,
77	&net5501_leds_dev,
78};
79
80static void __init register_net5501(void)
81{
82	/* Setup LED control through leds-gpio driver */
83	platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
84}
85
86struct net5501_board {
87	u16	offset;
88	u16	len;
89	char	*sig;
90};
91
92static struct net5501_board __initdata boards[] = {
93	{ 0xb7b, 7, "net5501" },	/* net5501 v1.33/1.33c */
94	{ 0xb1f, 7, "net5501" },	/* net5501 v1.32i */
95};
96
97static bool __init net5501_present(void)
98{
99	int i;
100	unsigned char *rombase, *bios;
101	bool found = false;
102
103	rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
104	if (!rombase) {
105		printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
106		return found;
107	}
108
109	bios = rombase + 0x20;	/* null terminated */
110
111	if (memcmp(bios, "comBIOS", 7))
112		goto unmap;
113
114	for (i = 0; i < ARRAY_SIZE(boards); i++) {
115		unsigned char *model = rombase + boards[i].offset;
116
117		if (!memcmp(model, boards[i].sig, boards[i].len)) {
118			printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
119			       KBUILD_MODNAME, model);
120
121			found = true;
122			break;
123		}
124	}
125
126unmap:
127	iounmap(rombase);
128	return found;
129}
130
131static int __init net5501_init(void)
132{
133	if (!is_geode())
134		return 0;
135
136	if (!net5501_present())
137		return 0;
138
139	register_net5501();
140
141	return 0;
142}
143device_initcall(net5501_init);
144