projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d4f3e350 EW |
1 | /* |
| 2 | * System Specific setup for PCEngines ALIX. | |
| 3 | * At the moment this means setup of GPIO control of LEDs | |
| 4 | * on Alix.2/3/6 boards. | |
| 5 | * | |
| 6 | * | |
| 7 | * Copyright (C) 2008 Constantin Baranov <const@mimas.ru> | |
| 8 | * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com> | |
| 9 | * | |
| 10 | * TODO: There are large similarities with leds-net5501.c | |
| 11 | * by Alessandro Zummo <a.zummo@towertech.it> | |
| 12 | * In the future leds-net5501.c should be migrated over to platform | |
| 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 | ||
| 28 | #include <asm/geode.h> | |
| 29 | ||
| 476bc001 | 30 | static bool force = 0; |
| d4f3e350 EW |
31 | module_param(force, bool, 0444); |
| 32 | /* FIXME: Award bios is not automatically detected as Alix platform */ | |
| 33 | MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform"); | |
| 34 | ||
| 35 | static struct gpio_led alix_leds[] = { | |
| 36 | { | |
| 37 | .name = "alix:1", | |
| 38 | .gpio = 6, | |
| 39 | .default_trigger = "default-on", | |
| 40 | .active_low = 1, | |
| 41 | }, | |
| 42 | { | |
| 43 | .name = "alix:2", | |
| 44 | .gpio = 25, | |
| 45 | .default_trigger = "default-off", | |
| 46 | .active_low = 1, | |
| 47 | }, | |
| 48 | { | |
| 49 | .name = "alix:3", | |
| 50 | .gpio = 27, | |
| 51 | .default_trigger = "default-off", | |
| 52 | .active_low = 1, | |
| 53 | }, | |
| 54 | }; | |
| 55 | ||
| 56 | static struct gpio_led_platform_data alix_leds_data = { | |
| 57 | .num_leds = ARRAY_SIZE(alix_leds), | |
| 58 | .leds = alix_leds, | |
| 59 | }; | |
| 60 | ||
| 61 | static struct platform_device alix_leds_dev = { | |
| 62 | .name = "leds-gpio", | |
| 63 | .id = -1, | |
| 64 | .dev.platform_data = &alix_leds_data, | |
| 65 | }; | |
| 66 | ||
| 67 | static void __init register_alix(void) | |
| 68 | { | |
| 69 | /* Setup LED control through leds-gpio driver */ | |
| 70 | platform_device_register(&alix_leds_dev); | |
| 71 | } | |
| 72 | ||
| 73 | static int __init alix_present(unsigned long bios_phys, | |
| 74 | const char *alix_sig, | |
| 75 | size_t alix_sig_len) | |
| 76 | { | |
| 77 | const size_t bios_len = 0x00010000; | |
| 78 | const char *bios_virt; | |
| 79 | const char *scan_end; | |
| 80 | const char *p; | |
| 81 | char name[64]; | |
| 82 | ||
| 83 | if (force) { | |
| 84 | printk(KERN_NOTICE "%s: forced to skip BIOS test, " | |
| 85 | "assume system is ALIX.2/ALIX.3\n", | |
| 86 | KBUILD_MODNAME); | |
| 87 | return 1; | |
| 88 | } | |
| 89 | ||
| 90 | bios_virt = phys_to_virt(bios_phys); | |
| 91 | scan_end = bios_virt + bios_len - (alix_sig_len + 2); | |
| 92 | for (p = bios_virt; p < scan_end; p++) { | |
| 93 | const char *tail; | |
| 94 | char *a; | |
| 95 | ||
| 96 | if (memcmp(p, alix_sig, alix_sig_len) != 0) | |
| 97 | continue; | |
| 98 | ||
| 99 | memcpy(name, p, sizeof(name)); | |
| 100 | ||
| 101 | /* remove the first \0 character from string */ | |
| 102 | a = strchr(name, '\0'); | |
| 103 | if (a) | |
| 104 | *a = ' '; | |
| 105 | ||
| 106 | /* cut the string at a newline */ | |
| 107 | a = strchr(name, '\r'); | |
| 108 | if (a) | |
| 109 | *a = '\0'; | |
| 110 | ||
| 111 | tail = p + alix_sig_len; | |
| 112 | if ((tail[0] == '2' || tail[0] == '3')) { | |
| 113 | printk(KERN_INFO | |
| 114 | "%s: system is recognized as \"%s\"\n", | |
| 115 | KBUILD_MODNAME, name); | |
| 116 | return 1; | |
| 117 | } | |
| 118 | } | |
| 119 | ||
| 120 | return 0; | |
| 121 | } | |
| 122 | ||
| 123 | static int __init alix_init(void) | |
| 124 | { | |
| 125 | const char tinybios_sig[] = "PC Engines ALIX."; | |
| 126 | const char coreboot_sig[] = "PC Engines\0ALIX."; | |
| 127 | ||
| 128 | if (!is_geode()) | |
| 129 | return 0; | |
| 130 | ||
| 131 | if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) || | |
| 132 | alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1)) | |
| 133 | register_alix(); | |
| 134 | ||
| 135 | return 0; | |
| 136 | } | |
| 137 | ||
| 138 | module_init(alix_init); | |
| 139 | ||
| 140 | MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>"); | |
| 141 | MODULE_DESCRIPTION("PCEngines ALIX System Setup"); | |
| 142 | MODULE_LICENSE("GPL"); |