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/* * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device * * Copyright (C) 2013 Google, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2 of the License. */ #include <linux/dmi.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pstore_ram.h> static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = { { /* * Today all Chromebooks/boxes ship with GOOGLE as vendor and * coreboot as bios vendor. No other systems with this * combination are known to date. */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), }, }, { /* * The first Samsung Chromebox and Chromebook Series 5 550 use * coreboot but with Samsung as the system vendor. */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"), DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), }, }, { /* x86-alex, the first Samsung Chromebook. */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), }, }, { /* x86-mario, the Cr-48 pilot device from Google. */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IEC"), DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), }, }, { /* x86-zgb, the first Acer Chromebook. */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "ACER"), DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), }, }, { } }; MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table); /* * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory * range untouched across reboots, so we use that to store our pstore * contents for panic logs, etc. */ static struct ramoops_platform_data chromeos_ramoops_data = { .mem_size = 0x100000, .mem_address = 0xf00000, .record_size = 0x20000, .console_size = 0x20000, .ftrace_size = 0x20000, .dump_oops = 1, }; static struct platform_device chromeos_ramoops = { .name = "ramoops", .dev = { .platform_data = &chromeos_ramoops_data, }, }; static int __init chromeos_pstore_init(void) { if (dmi_check_system(chromeos_pstore_dmi_table)) return platform_device_register(&chromeos_ramoops); return -ENODEV; } static void __exit chromeos_pstore_exit(void) { platform_device_unregister(&chromeos_ramoops); } module_init(chromeos_pstore_init); module_exit(chromeos_pstore_exit); MODULE_DESCRIPTION("Chrome OS pstore module"); MODULE_LICENSE("GPL"); |