cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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net5501.c (3380B)

      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);