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#include <linux/gpio/machine.h>
24
25#include <asm/geode.h>
26
27#define BIOS_REGION_BASE		0xffff0000
28#define BIOS_REGION_SIZE		0x00010000
29
30static struct gpio_keys_button net5501_gpio_buttons[] = {
31	{
32		.code = KEY_RESTART,
33		.gpio = 24,
34		.active_low = 1,
35		.desc = "Reset button",
36		.type = EV_KEY,
37		.wakeup = 0,
38		.debounce_interval = 100,
39		.can_disable = 0,
40	}
41};
42static struct gpio_keys_platform_data net5501_buttons_data = {
43	.buttons = net5501_gpio_buttons,
44	.nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
45	.poll_interval = 20,
46};
47
48static struct platform_device net5501_buttons_dev = {
49	.name = "gpio-keys-polled",
50	.id = 1,
51	.dev = {
52		.platform_data = &net5501_buttons_data,
53	}
54};
55
56static struct gpio_led net5501_leds[] = {
57	{
58		.name = "net5501:1",
59		.default_trigger = "default-on",
60	},
61};
62
63static struct gpio_led_platform_data net5501_leds_data = {
64	.num_leds = ARRAY_SIZE(net5501_leds),
65	.leds = net5501_leds,
66};
67
68static struct gpiod_lookup_table net5501_leds_gpio_table = {
69	.dev_id = "leds-gpio",
70	.table = {
71		/* The Geode GPIOs should be on the CS5535 companion chip */
72		GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_HIGH),
73		{ }
74	},
75};
76
77static struct platform_device net5501_leds_dev = {
78	.name = "leds-gpio",
79	.id = -1,
80	.dev.platform_data = &net5501_leds_data,
81};
82
83static struct platform_device *net5501_devs[] __initdata = {
84	&net5501_buttons_dev,
85	&net5501_leds_dev,
86};
87
88static void __init register_net5501(void)
89{
90	/* Setup LED control through leds-gpio driver */
91	gpiod_add_lookup_table(&net5501_leds_gpio_table);
92	platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
93}
94
95struct net5501_board {
96	u16	offset;
97	u16	len;
98	char	*sig;
99};
100
101static struct net5501_board __initdata boards[] = {
102	{ 0xb7b, 7, "net5501" },	/* net5501 v1.33/1.33c */
103	{ 0xb1f, 7, "net5501" },	/* net5501 v1.32i */
104};
105
106static bool __init net5501_present(void)
107{
108	int i;
109	unsigned char *rombase, *bios;
110	bool found = false;
111
112	rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
113	if (!rombase) {
114		printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
115		return found;
116	}
117
118	bios = rombase + 0x20;	/* null terminated */
119
120	if (memcmp(bios, "comBIOS", 7))
121		goto unmap;
122
123	for (i = 0; i < ARRAY_SIZE(boards); i++) {
124		unsigned char *model = rombase + boards[i].offset;
125
126		if (!memcmp(model, boards[i].sig, boards[i].len)) {
127			printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
128			       KBUILD_MODNAME, model);
129
130			found = true;
131			break;
132		}
133	}
134
135unmap:
136	iounmap(rombase);
137	return found;
138}
139
140static int __init net5501_init(void)
141{
142	if (!is_geode())
143		return 0;
144
145	if (!net5501_present())
146		return 0;
147
148	register_net5501();
149
150	return 0;
151}
152device_initcall(net5501_init);
153