[mirror_ubuntu-focal-kernel.git] / drivers / platform / chrome / chromeos_pstore.c

// 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,
	.dump_oops	= 1,
};

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");
Commit	Line	Data
ac8c1a2e EBS	1	// SPDX-License-Identifier: GPL-2.0
	2	// Driver to instantiate Chromebook ramoops device.
	3	//
	4	// Copyright (C) 2013 Google, Inc.
9742e127	5
59a356d2	6	#include <linux/acpi.h>
9742e127 OJ	7	#include <linux/dmi.h>
	8	#include <linux/module.h>
	9	#include <linux/platform_device.h>
	10	#include <linux/pstore_ram.h>
	11
6faadbbb	12	static const struct dmi_system_id chromeos_pstore_dmi_table[] __initconst = {
9742e127 OJ	13	{
9742e127 OJ	14	/*
d1c14370	15	* Today all Chromebooks/boxes ship with Google_* as version and
9742e127 OJ	16	* coreboot as bios vendor. No other systems with this
	17	* combination are known to date.
	18	*/
	19	.matches = {
9742e127	20	DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
d1c14370	21	DMI_MATCH(DMI_BIOS_VERSION, "Google_"),
9742e127 OJ	22	},
	23	},
	24	{
	25	/* x86-alex, the first Samsung Chromebook. */
	26	.matches = {
	27	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
	28	DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
	29	},
	30	},
	31	{
	32	/* x86-mario, the Cr-48 pilot device from Google. */
	33	.matches = {
	34	DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
	35	DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
	36	},
	37	},
	38	{
	39	/* x86-zgb, the first Acer Chromebook. */
	40	.matches = {
	41	DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
	42	DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
	43	},
	44	},
	45	{ }
	46	};
	47	MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
	48
	49	/*
	50	* On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
	51	* range untouched across reboots, so we use that to store our pstore
	52	* contents for panic logs, etc.
	53	*/
	54	static struct ramoops_platform_data chromeos_ramoops_data = {
	55	.mem_size = 0x100000,
	56	.mem_address = 0xf00000,
f929efb0	57	.record_size = 0x40000,
9742e127 OJ	58	.console_size = 0x20000,
	59	.ftrace_size = 0x20000,
	60	.dump_oops = 1,
	61	};
	62
	63	static struct platform_device chromeos_ramoops = {
	64	.name = "ramoops",
	65	.dev = {
	66	.platform_data = &chromeos_ramoops_data,
	67	},
	68	};
	69
59a356d2 AD	70	#ifdef CONFIG_ACPI
	71	static const struct acpi_device_id cros_ramoops_acpi_match[] = {
	72	{ "GOOG9999", 0 },
	73	{ }
	74	};
	75	MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match);
	76
	77	static struct platform_driver chromeos_ramoops_acpi = {
	78	.driver = {
	79	.name = "chromeos_pstore",
	80	.acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match),
	81	},
	82	};
	83
	84	static int __init chromeos_probe_acpi(struct platform_device *pdev)
	85	{
	86	struct resource *res;
	87	resource_size_t len;
	88
	89	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	90	if (!res)
	91	return -ENOMEM;
	92
	93	len = resource_size(res);
	94	if (!res->start \|\| !len)
	95	return -ENOMEM;
	96
	97	pr_info("chromeos ramoops using acpi device.\n");
	98
	99	chromeos_ramoops_data.mem_size = len;
	100	chromeos_ramoops_data.mem_address = res->start;
	101
	102	return 0;
	103	}
	104
	105	static bool __init chromeos_check_acpi(void)
	106	{
	107	if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi))
	108	return true;
	109	return false;
	110	}
	111	#else
	112	static inline bool chromeos_check_acpi(void) { return false; }
	113	#endif
	114
9742e127 OJ	115	static int __init chromeos_pstore_init(void)
9742e127 OJ	116	{
59a356d2 AD	117	bool acpi_dev_found;
	118
	119	/* First check ACPI for non-hardcoded values from firmware. */
	120	acpi_dev_found = chromeos_check_acpi();
	121
	122	if (acpi_dev_found \|\| dmi_check_system(chromeos_pstore_dmi_table))
9742e127 OJ	123	return platform_device_register(&chromeos_ramoops);
	124
	125	return -ENODEV;
	126	}
	127
	128	static void __exit chromeos_pstore_exit(void)
	129	{
	130	platform_device_unregister(&chromeos_ramoops);
	131	}
	132
	133	module_init(chromeos_pstore_init);
	134	module_exit(chromeos_pstore_exit);
	135
ac8c1a2e EBS	136	MODULE_DESCRIPTION("ChromeOS pstore module");
ac8c1a2e EBS	137	MODULE_LICENSE("GPL v2");