Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 1 | /* |
| 2 | * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device |
| 3 | * |
| 4 | * Copyright (C) 2013 Google, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation, version 2 of the License. |
| 9 | */ |
| 10 | |
Aaron Durbin | 59a356d | 2016-02-16 08:25:15 +0100 | [diff] [blame] | 11 | #include <linux/acpi.h> |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 12 | #include <linux/dmi.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/pstore_ram.h> |
| 16 | |
| 17 | static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = { |
| 18 | { |
| 19 | /* |
Olof Johansson | d1c1437 | 2014-07-10 10:17:35 -0700 | [diff] [blame] | 20 | * Today all Chromebooks/boxes ship with Google_* as version and |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 21 | * coreboot as bios vendor. No other systems with this |
| 22 | * combination are known to date. |
| 23 | */ |
| 24 | .matches = { |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 25 | DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), |
Olof Johansson | d1c1437 | 2014-07-10 10:17:35 -0700 | [diff] [blame] | 26 | DMI_MATCH(DMI_BIOS_VERSION, "Google_"), |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 27 | }, |
| 28 | }, |
| 29 | { |
| 30 | /* x86-alex, the first Samsung Chromebook. */ |
| 31 | .matches = { |
| 32 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| 33 | DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), |
| 34 | }, |
| 35 | }, |
| 36 | { |
| 37 | /* x86-mario, the Cr-48 pilot device from Google. */ |
| 38 | .matches = { |
| 39 | DMI_MATCH(DMI_SYS_VENDOR, "IEC"), |
| 40 | DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), |
| 41 | }, |
| 42 | }, |
| 43 | { |
| 44 | /* x86-zgb, the first Acer Chromebook. */ |
| 45 | .matches = { |
| 46 | DMI_MATCH(DMI_SYS_VENDOR, "ACER"), |
| 47 | DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), |
| 48 | }, |
| 49 | }, |
| 50 | { } |
| 51 | }; |
| 52 | MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table); |
| 53 | |
| 54 | /* |
| 55 | * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory |
| 56 | * range untouched across reboots, so we use that to store our pstore |
| 57 | * contents for panic logs, etc. |
| 58 | */ |
| 59 | static struct ramoops_platform_data chromeos_ramoops_data = { |
| 60 | .mem_size = 0x100000, |
| 61 | .mem_address = 0xf00000, |
Olof Johansson | f929efb | 2016-02-16 08:25:16 +0100 | [diff] [blame] | 62 | .record_size = 0x40000, |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 63 | .console_size = 0x20000, |
| 64 | .ftrace_size = 0x20000, |
| 65 | .dump_oops = 1, |
| 66 | }; |
| 67 | |
| 68 | static struct platform_device chromeos_ramoops = { |
| 69 | .name = "ramoops", |
| 70 | .dev = { |
| 71 | .platform_data = &chromeos_ramoops_data, |
| 72 | }, |
| 73 | }; |
| 74 | |
Aaron Durbin | 59a356d | 2016-02-16 08:25:15 +0100 | [diff] [blame] | 75 | #ifdef CONFIG_ACPI |
| 76 | static const struct acpi_device_id cros_ramoops_acpi_match[] = { |
| 77 | { "GOOG9999", 0 }, |
| 78 | { } |
| 79 | }; |
| 80 | MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match); |
| 81 | |
| 82 | static struct platform_driver chromeos_ramoops_acpi = { |
| 83 | .driver = { |
| 84 | .name = "chromeos_pstore", |
| 85 | .acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match), |
| 86 | }, |
| 87 | }; |
| 88 | |
| 89 | static int __init chromeos_probe_acpi(struct platform_device *pdev) |
| 90 | { |
| 91 | struct resource *res; |
| 92 | resource_size_t len; |
| 93 | |
| 94 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 95 | if (!res) |
| 96 | return -ENOMEM; |
| 97 | |
| 98 | len = resource_size(res); |
| 99 | if (!res->start || !len) |
| 100 | return -ENOMEM; |
| 101 | |
| 102 | pr_info("chromeos ramoops using acpi device.\n"); |
| 103 | |
| 104 | chromeos_ramoops_data.mem_size = len; |
| 105 | chromeos_ramoops_data.mem_address = res->start; |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static bool __init chromeos_check_acpi(void) |
| 111 | { |
| 112 | if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi)) |
| 113 | return true; |
| 114 | return false; |
| 115 | } |
| 116 | #else |
| 117 | static inline bool chromeos_check_acpi(void) { return false; } |
| 118 | #endif |
| 119 | |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 120 | static int __init chromeos_pstore_init(void) |
| 121 | { |
Aaron Durbin | 59a356d | 2016-02-16 08:25:15 +0100 | [diff] [blame] | 122 | bool acpi_dev_found; |
| 123 | |
| 124 | /* First check ACPI for non-hardcoded values from firmware. */ |
| 125 | acpi_dev_found = chromeos_check_acpi(); |
| 126 | |
| 127 | if (acpi_dev_found || dmi_check_system(chromeos_pstore_dmi_table)) |
Olof Johansson | 9742e12 | 2013-11-12 13:32:13 -0800 | [diff] [blame] | 128 | return platform_device_register(&chromeos_ramoops); |
| 129 | |
| 130 | return -ENODEV; |
| 131 | } |
| 132 | |
| 133 | static void __exit chromeos_pstore_exit(void) |
| 134 | { |
| 135 | platform_device_unregister(&chromeos_ramoops); |
| 136 | } |
| 137 | |
| 138 | module_init(chromeos_pstore_init); |
| 139 | module_exit(chromeos_pstore_exit); |
| 140 | |
| 141 | MODULE_DESCRIPTION("Chrome OS pstore module"); |
| 142 | MODULE_LICENSE("GPL"); |