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 30 static 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 }; 42 static 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 48 static 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 56 static struct gpio_led net5501_leds[] = { 57 { 58 .name = "net5501:1", 59 .default_trigger = "default-on", 60 }, 61 }; 62 63 static struct gpio_led_platform_data net5501_leds_data = { 64 .num_leds = ARRAY_SIZE(net5501_leds), 65 .leds = net5501_leds, 66 }; 67 68 static 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 77 static struct platform_device net5501_leds_dev = { 78 .name = "leds-gpio", 79 .id = -1, 80 .dev.platform_data = &net5501_leds_data, 81 }; 82 83 static struct platform_device *net5501_devs[] __initdata = { 84 &net5501_buttons_dev, 85 &net5501_leds_dev, 86 }; 87 88 static 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 95 struct net5501_board { 96 u16 offset; 97 u16 len; 98 char *sig; 99 }; 100 101 static struct net5501_board __initdata boards[] = { 102 { 0xb7b, 7, "net5501" }, /* net5501 v1.33/1.33c */ 103 { 0xb1f, 7, "net5501" }, /* net5501 v1.32i */ 104 }; 105 106 static 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 } 134 135 unmap: 136 iounmap(rombase); 137 return found; 138 } 139 140 static 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 } 152 device_initcall(net5501_init); 153