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