diff options
Diffstat (limited to 'drivers/platform/chrome/chromeos_pstore.c')
-rw-r--r-- | drivers/platform/chrome/chromeos_pstore.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c new file mode 100644 index 000000000..f37c0ef4a --- /dev/null +++ b/drivers/platform/chrome/chromeos_pstore.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0 +// Driver to instantiate Chromebook ramoops device. +// +// Copyright (C) 2013 Google, Inc. + +#include <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pstore_ram.h> + +static const struct dmi_system_id chromeos_pstore_dmi_table[] __initconst = { + { + /* + * 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, + .pmsg_size = 0x20000, + .max_reason = KMSG_DUMP_OOPS, +}; + +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("ChromeOS pstore module"); +MODULE_LICENSE("GPL v2"); |