153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* System Specific setup for Soekris net5501
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* At the moment this means setup of GPIO control of LEDs and buttons
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* on net5501 boards.
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*
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* Copyright (C) 2008-2009 Tower Technologies
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* Written by Alessandro Zummo <a.zummo@towertech.it>
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*
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* Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
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* Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
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* and Philip Prindeville <philipp@redfish-solutions.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/string.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/gpio_keys.h>
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#include <linux/gpio/machine.h>
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#include <asm/geode.h>
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#define BIOS_REGION_BASE 0xffff0000
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#define BIOS_REGION_SIZE 0x00010000
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static struct gpio_keys_button net5501_gpio_buttons[] = {
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{
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.code = KEY_RESTART,
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.gpio = 24,
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.active_low = 1,
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.desc = "Reset button",
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.type = EV_KEY,
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.wakeup = 0,
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.debounce_interval = 100,
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.can_disable = 0,
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}
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};
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static struct gpio_keys_platform_data net5501_buttons_data = {
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.buttons = net5501_gpio_buttons,
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.nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
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.poll_interval = 20,
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};
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static struct platform_device net5501_buttons_dev = {
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.name = "gpio-keys-polled",
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.id = 1,
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.dev = {
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.platform_data = &net5501_buttons_data,
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}
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};
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static struct gpio_led net5501_leds[] = {
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{
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.name = "net5501:1",
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.default_trigger = "default-on",
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},
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};
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static struct gpio_led_platform_data net5501_leds_data = {
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.num_leds = ARRAY_SIZE(net5501_leds),
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.leds = net5501_leds,
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};
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static struct gpiod_lookup_table net5501_leds_gpio_table = {
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.dev_id = "leds-gpio",
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.table = {
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/* The Geode GPIOs should be on the CS5535 companion chip */
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GPIO_LOOKUP_IDX("cs5535-gpio", 6, NULL, 0, GPIO_ACTIVE_HIGH),
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{ }
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},
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};
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static struct platform_device net5501_leds_dev = {
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.name = "leds-gpio",
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.id = -1,
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.dev.platform_data = &net5501_leds_data,
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};
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static struct platform_device *net5501_devs[] __initdata = {
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&net5501_buttons_dev,
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&net5501_leds_dev,
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};
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static void __init register_net5501(void)
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{
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/* Setup LED control through leds-gpio driver */
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gpiod_add_lookup_table(&net5501_leds_gpio_table);
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platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
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}
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struct net5501_board {
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u16 offset;
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u16 len;
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char *sig;
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};
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static struct net5501_board __initdata boards[] = {
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{ 0xb7b, 7, "net5501" }, /* net5501 v1.33/1.33c */
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{ 0xb1f, 7, "net5501" }, /* net5501 v1.32i */
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};
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static bool __init net5501_present(void)
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{
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int i;
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unsigned char *rombase, *bios;
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bool found = false;
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rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
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if (!rombase) {
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printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
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return found;
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}
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bios = rombase + 0x20; /* null terminated */
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if (memcmp(bios, "comBIOS", 7))
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goto unmap;
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for (i = 0; i < ARRAY_SIZE(boards); i++) {
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unsigned char *model = rombase + boards[i].offset;
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if (!memcmp(model, boards[i].sig, boards[i].len)) {
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printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
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KBUILD_MODNAME, model);
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found = true;
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break;
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}
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}
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unmap:
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iounmap(rombase);
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return found;
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}
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static int __init net5501_init(void)
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{
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if (!is_geode())
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return 0;
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if (!net5501_present())
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return 0;
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register_net5501();
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return 0;
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}
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device_initcall(net5501_init);
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