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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");
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