1 /* 2 * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device 3 * 4 * Copyright (C) 2013 Google, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, version 2 of the License. 9 */ 10 11 #include <linux/dmi.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/pstore_ram.h> 15 16 static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = { 17 { 18 /* 19 * Today all Chromebooks/boxes ship with Google_* as version and 20 * coreboot as bios vendor. No other systems with this 21 * combination are known to date. 22 */ 23 .matches = { 24 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), 25 DMI_MATCH(DMI_BIOS_VERSION, "Google_"), 26 }, 27 }, 28 { 29 /* x86-alex, the first Samsung Chromebook. */ 30 .matches = { 31 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 32 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), 33 }, 34 }, 35 { 36 /* x86-mario, the Cr-48 pilot device from Google. */ 37 .matches = { 38 DMI_MATCH(DMI_SYS_VENDOR, "IEC"), 39 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), 40 }, 41 }, 42 { 43 /* x86-zgb, the first Acer Chromebook. */ 44 .matches = { 45 DMI_MATCH(DMI_SYS_VENDOR, "ACER"), 46 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), 47 }, 48 }, 49 { } 50 }; 51 MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table); 52 53 /* 54 * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory 55 * range untouched across reboots, so we use that to store our pstore 56 * contents for panic logs, etc. 57 */ 58 static struct ramoops_platform_data chromeos_ramoops_data = { 59 .mem_size = 0x100000, 60 .mem_address = 0xf00000, 61 .record_size = 0x20000, 62 .console_size = 0x20000, 63 .ftrace_size = 0x20000, 64 .dump_oops = 1, 65 }; 66 67 static struct platform_device chromeos_ramoops = { 68 .name = "ramoops", 69 .dev = { 70 .platform_data = &chromeos_ramoops_data, 71 }, 72 }; 73 74 static int __init chromeos_pstore_init(void) 75 { 76 if (dmi_check_system(chromeos_pstore_dmi_table)) 77 return platform_device_register(&chromeos_ramoops); 78 79 return -ENODEV; 80 } 81 82 static void __exit chromeos_pstore_exit(void) 83 { 84 platform_device_unregister(&chromeos_ramoops); 85 } 86 87 module_init(chromeos_pstore_init); 88 module_exit(chromeos_pstore_exit); 89 90 MODULE_DESCRIPTION("Chrome OS pstore module"); 91 MODULE_LICENSE("GPL"); 92