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
11#include <linux/dmi.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/pstore_ram.h>
15
16static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = {
17	{
18		/*
19		 * Today all Chromebooks/boxes ship with Google_* as version and
20		 * coreboot as bios vendor. No other systems with this
21		 * combination are known to date.
22		 */
23		.matches = {
 
 
 
 
 
 
 
 
 
 
 
24			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
25			DMI_MATCH(DMI_BIOS_VERSION, "Google_"),
26		},
27	},
28	{
29		/* x86-alex, the first Samsung Chromebook. */
30		.matches = {
31			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
32			DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
33		},
34	},
35	{
36		/* x86-mario, the Cr-48 pilot device from Google. */
37		.matches = {
38			DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
39			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
40		},
41	},
42	{
43		/* x86-zgb, the first Acer Chromebook. */
44		.matches = {
45			DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
46			DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
47		},
48	},
49	{ }
50};
51MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
52
53/*
54 * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
55 * range untouched across reboots, so we use that to store our pstore
56 * contents for panic logs, etc.
57 */
58static struct ramoops_platform_data chromeos_ramoops_data = {
59	.mem_size	= 0x100000,
60	.mem_address	= 0xf00000,
61	.record_size	= 0x20000,
62	.console_size	= 0x20000,
63	.ftrace_size	= 0x20000,
64	.dump_oops	= 1,
65};
66
67static struct platform_device chromeos_ramoops = {
68	.name = "ramoops",
69	.dev = {
70		.platform_data = &chromeos_ramoops_data,
71	},
72};
73
74static int __init chromeos_pstore_init(void)
75{
76	if (dmi_check_system(chromeos_pstore_dmi_table))
77		return platform_device_register(&chromeos_ramoops);
78
79	return -ENODEV;
80}
81
82static void __exit chromeos_pstore_exit(void)
83{
84	platform_device_unregister(&chromeos_ramoops);
85}
86
87module_init(chromeos_pstore_init);
88module_exit(chromeos_pstore_exit);
89
90MODULE_DESCRIPTION("Chrome OS pstore module");
91MODULE_LICENSE("GPL");

  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
 11#include <linux/dmi.h>
 12#include <linux/module.h>
 13#include <linux/platform_device.h>
 14#include <linux/pstore_ram.h>
 15
 16static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = {
 17	{
 18		/*
 19		 * Today all Chromebooks/boxes ship with GOOGLE as vendor and
 20		 * coreboot as bios vendor. No other systems with this
 21		 * combination are known to date.
 22		 */
 23		.matches = {
 24			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
 25			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 26		},
 27	},
 28	{
 29		/*
 30		 * The first Samsung Chromebox and Chromebook Series 5 550 use
 31		 * coreboot but with Samsung as the system vendor.
 32		 */
 33		.matches = {
 34			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
 35			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
 
 36		},
 37	},
 38	{
 39		/* x86-alex, the first Samsung Chromebook. */
 40		.matches = {
 41			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 42			DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
 43		},
 44	},
 45	{
 46		/* x86-mario, the Cr-48 pilot device from Google. */
 47		.matches = {
 48			DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
 49			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
 50		},
 51	},
 52	{
 53		/* x86-zgb, the first Acer Chromebook. */
 54		.matches = {
 55			DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 56			DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 57		},
 58	},
 59	{ }
 60};
 61MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
 62
 63/*
 64 * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
 65 * range untouched across reboots, so we use that to store our pstore
 66 * contents for panic logs, etc.
 67 */
 68static struct ramoops_platform_data chromeos_ramoops_data = {
 69	.mem_size	= 0x100000,
 70	.mem_address	= 0xf00000,
 71	.record_size	= 0x20000,
 72	.console_size	= 0x20000,
 73	.ftrace_size	= 0x20000,
 74	.dump_oops	= 1,
 75};
 76
 77static struct platform_device chromeos_ramoops = {
 78	.name = "ramoops",
 79	.dev = {
 80		.platform_data = &chromeos_ramoops_data,
 81	},
 82};
 83
 84static int __init chromeos_pstore_init(void)
 85{
 86	if (dmi_check_system(chromeos_pstore_dmi_table))
 87		return platform_device_register(&chromeos_ramoops);
 88
 89	return -ENODEV;
 90}
 91
 92static void __exit chromeos_pstore_exit(void)
 93{
 94	platform_device_unregister(&chromeos_ramoops);
 95}
 96
 97module_init(chromeos_pstore_init);
 98module_exit(chromeos_pstore_exit);
 99
100MODULE_DESCRIPTION("Chrome OS pstore module");
101MODULE_LICENSE("GPL");