1/*
2 * System Specific setup for Soekris net5501
3 * At the moment this means setup of GPIO control of LEDs and buttons
4 * on net5501 boards.
5 *
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 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2
16 * as published by the Free Software Foundation.
17 */
18
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/io.h>
22#include <linux/string.h>
23#include <linux/module.h>
24#include <linux/leds.h>
25#include <linux/platform_device.h>
26#include <linux/gpio.h>
27#include <linux/input.h>
28#include <linux/gpio_keys.h>
29
30#include <asm/geode.h>
31
32#define BIOS_REGION_BASE		0xffff0000
33#define BIOS_REGION_SIZE		0x00010000
34
35static struct gpio_keys_button net5501_gpio_buttons[] = {
36	{
37		.code = KEY_RESTART,
38		.gpio = 24,
39		.active_low = 1,
40		.desc = "Reset button",
41		.type = EV_KEY,
42		.wakeup = 0,
43		.debounce_interval = 100,
44		.can_disable = 0,
45	}
46};
47static struct gpio_keys_platform_data net5501_buttons_data = {
48	.buttons = net5501_gpio_buttons,
49	.nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
50	.poll_interval = 20,
51};
52
53static struct platform_device net5501_buttons_dev = {
54	.name = "gpio-keys-polled",
55	.id = 1,
56	.dev = {
57		.platform_data = &net5501_buttons_data,
58	}
59};
60
61static struct gpio_led net5501_leds[] = {
62	{
63		.name = "net5501:1",
64		.gpio = 6,
65		.default_trigger = "default-on",
66		.active_low = 0,
67	},
68};
69
70static struct gpio_led_platform_data net5501_leds_data = {
71	.num_leds = ARRAY_SIZE(net5501_leds),
72	.leds = net5501_leds,
73};
74
75static struct platform_device net5501_leds_dev = {
76	.name = "leds-gpio",
77	.id = -1,
78	.dev.platform_data = &net5501_leds_data,
79};
80
81static struct platform_device *net5501_devs[] __initdata = {
82	&net5501_buttons_dev,
83	&net5501_leds_dev,
84};
85
86static void __init register_net5501(void)
87{
88	/* Setup LED control through leds-gpio driver */
89	platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
90}
91
92struct net5501_board {
93	u16	offset;
94	u16	len;
95	char	*sig;
96};
97
98static struct net5501_board __initdata boards[] = {
99	{ 0xb7b, 7, "net5501" },	/* net5501 v1.33/1.33c */
100	{ 0xb1f, 7, "net5501" },	/* net5501 v1.32i */
101};
102
103static bool __init net5501_present(void)
104{
105	int i;
106	unsigned char *rombase, *bios;
107	bool found = false;
108
109	rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
110	if (!rombase) {
111		printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
112		return found;
113	}
114
115	bios = rombase + 0x20;	/* null terminated */
116
117	if (memcmp(bios, "comBIOS", 7))
118		goto unmap;
119
120	for (i = 0; i < ARRAY_SIZE(boards); i++) {
121		unsigned char *model = rombase + boards[i].offset;
122
123		if (!memcmp(model, boards[i].sig, boards[i].len)) {
124			printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
125			       KBUILD_MODNAME, model);
126
127			found = true;
128			break;
129		}
130	}
131
132unmap:
133	iounmap(rombase);
134	return found;
135}
136
137static int __init net5501_init(void)
138{
139	if (!is_geode())
140		return 0;
141
142	if (!net5501_present())
143		return 0;
144
145	register_net5501();
146
147	return 0;
148}
149
150module_init(net5501_init);
151
152MODULE_AUTHOR("Philip Prindeville <philipp@redfish-solutions.com>");
153MODULE_DESCRIPTION("Soekris net5501 System Setup");
154MODULE_LICENSE("GPL");
155