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9742e127 OJ |
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 | ||
59a356d2 | 11 | #include <linux/acpi.h> |
9742e127 OJ |
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 | /* | |
d1c14370 | 20 | * Today all Chromebooks/boxes ship with Google_* as version and |
9742e127 OJ |
21 | * coreboot as bios vendor. No other systems with this |
22 | * combination are known to date. | |
23 | */ | |
24 | .matches = { | |
9742e127 | 25 | DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), |
d1c14370 | 26 | DMI_MATCH(DMI_BIOS_VERSION, "Google_"), |
9742e127 OJ |
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, | |
f929efb0 | 62 | .record_size = 0x40000, |
9742e127 OJ |
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 | ||
59a356d2 AD |
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 | ||
9742e127 OJ |
120 | static int __init chromeos_pstore_init(void) |
121 | { | |
59a356d2 AD |
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)) | |
9742e127 OJ |
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"); |