143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/*
|
|
* 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/acpi.h>
|
|
#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 version and
|
|
* coreboot as bios vendor. No other systems with this
|
|
* combination are known to date.
|
|
*/
|
|
.matches = {
|
|
DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
|
|
DMI_MATCH(DMI_BIOS_VERSION, "Google_"),
|
|
},
|
|
},
|
|
{
|
|
/* 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 = 0x40000,
|
|
.console_size = 0x20000,
|
|
.ftrace_size = 0x20000,
|
|
.dump_oops = 1,
|
|
};
|
|
|
|
static struct platform_device chromeos_ramoops = {
|
|
.name = "ramoops",
|
|
.dev = {
|
|
.platform_data = &chromeos_ramoops_data,
|
|
},
|
|
};
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id cros_ramoops_acpi_match[] = {
|
|
{ "GOOG9999", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match);
|
|
|
|
static struct platform_driver chromeos_ramoops_acpi = {
|
|
.driver = {
|
|
.name = "chromeos_pstore",
|
|
.acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match),
|
|
},
|
|
};
|
|
|
|
static int __init chromeos_probe_acpi(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
resource_size_t len;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENOMEM;
|
|
|
|
len = resource_size(res);
|
|
if (!res->start || !len)
|
|
return -ENOMEM;
|
|
|
|
pr_info("chromeos ramoops using acpi device.\n");
|
|
|
|
chromeos_ramoops_data.mem_size = len;
|
|
chromeos_ramoops_data.mem_address = res->start;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool __init chromeos_check_acpi(void)
|
|
{
|
|
if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi))
|
|
return true;
|
|
return false;
|
|
}
|
|
#else
|
|
static inline bool chromeos_check_acpi(void) { return false; }
|
|
#endif
|
|
|
|
static int __init chromeos_pstore_init(void)
|
|
{
|
|
bool acpi_dev_found;
|
|
|
|
/* First check ACPI for non-hardcoded values from firmware. */
|
|
acpi_dev_found = chromeos_check_acpi();
|
|
|
|
if (acpi_dev_found || 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");
|