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ac8c1a2e50
Adopt the SPDX license identifier headers to ease license compliance management. Also fix the module license mismatch and change the term 'Chrome OS' for 'ChromeOS' to be coherent with other drivers. Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Reviewed-by: Guenter Roeck <groeck@chromium.org>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Driver to instantiate Chromebook ramoops device.
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//
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// Copyright (C) 2013 Google, Inc.
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#include <linux/acpi.h>
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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 const struct dmi_system_id chromeos_pstore_dmi_table[] __initconst = {
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{
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/*
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* Today all Chromebooks/boxes ship with Google_* as version 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_BIOS_VENDOR, "coreboot"),
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DMI_MATCH(DMI_BIOS_VERSION, "Google_"),
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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 = 0x40000,
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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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#ifdef CONFIG_ACPI
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static const struct acpi_device_id cros_ramoops_acpi_match[] = {
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{ "GOOG9999", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match);
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static struct platform_driver chromeos_ramoops_acpi = {
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.driver = {
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.name = "chromeos_pstore",
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.acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match),
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},
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};
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static int __init chromeos_probe_acpi(struct platform_device *pdev)
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{
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struct resource *res;
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resource_size_t len;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENOMEM;
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len = resource_size(res);
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if (!res->start || !len)
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return -ENOMEM;
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pr_info("chromeos ramoops using acpi device.\n");
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chromeos_ramoops_data.mem_size = len;
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chromeos_ramoops_data.mem_address = res->start;
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return 0;
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}
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static bool __init chromeos_check_acpi(void)
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{
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if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi))
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return true;
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return false;
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}
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#else
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static inline bool chromeos_check_acpi(void) { return false; }
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#endif
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static int __init chromeos_pstore_init(void)
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{
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bool acpi_dev_found;
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/* First check ACPI for non-hardcoded values from firmware. */
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acpi_dev_found = chromeos_check_acpi();
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if (acpi_dev_found || 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("ChromeOS pstore module");
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MODULE_LICENSE("GPL v2");
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