diff options
| -rw-r--r-- | drivers/platform/chrome/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/platform/chrome/Makefile | 1 | ||||
| -rw-r--r-- | drivers/platform/chrome/chromeos_pstore.c | 101 |
3 files changed, 116 insertions, 0 deletions
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig index b13303e75a34..440ed776efd4 100644 --- a/drivers/platform/chrome/Kconfig +++ b/drivers/platform/chrome/Kconfig @@ -25,4 +25,18 @@ config CHROMEOS_LAPTOP If you have a supported Chromebook, choose Y or M here. The module will be called chromeos_laptop. +config CHROMEOS_PSTORE + tristate "Chrome OS pstore support" + ---help--- + This module instantiates the persistent storage on x86 ChromeOS + devices. It can be used to store away console logs and crash + information across reboots. + + The range of memory used is 0xf00000-0x1000000, traditionally + the memory used to back VGA controller memory. + + If you have a supported Chromebook, choose Y or M here. + The module will be called chromeos_pstore. + + endif # CHROMEOS_PLATFORMS diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile index 015e9195e226..2b860ca7450f 100644 --- a/drivers/platform/chrome/Makefile +++ b/drivers/platform/chrome/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o +obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c new file mode 100644 index 000000000000..e0e0e65cf442 --- /dev/null +++ b/drivers/platform/chrome/chromeos_pstore.c @@ -0,0 +1,101 @@ +/* + * 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"); |