89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
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/*
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* coreboot_table-acpi.c
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*
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* Using ACPI to locate Coreboot table and provide coreboot table access.
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*
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* Copyright 2017 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include "coreboot_table.h"
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static int coreboot_table_acpi_probe(struct platform_device *pdev)
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{
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phys_addr_t phyaddr;
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resource_size_t len;
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struct coreboot_table_header __iomem *header = NULL;
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struct resource *res;
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void __iomem *ptr = NULL;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EINVAL;
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len = resource_size(res);
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if (!res->start || !len)
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return -EINVAL;
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phyaddr = res->start;
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header = ioremap_cache(phyaddr, sizeof(*header));
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if (header == NULL)
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return -ENOMEM;
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ptr = ioremap_cache(phyaddr,
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header->header_bytes + header->table_bytes);
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iounmap(header);
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if (!ptr)
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return -ENOMEM;
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return coreboot_table_init(ptr);
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}
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static int coreboot_table_acpi_remove(struct platform_device *pdev)
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{
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return coreboot_table_exit();
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}
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static const struct acpi_device_id cros_coreboot_acpi_match[] = {
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{ "GOOGCB00", 0 },
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{ "BOOT0000", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match);
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static struct platform_driver coreboot_table_acpi_driver = {
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.probe = coreboot_table_acpi_probe,
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.remove = coreboot_table_acpi_remove,
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.driver = {
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.name = "coreboot_table_acpi",
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.acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match),
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},
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};
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static int __init coreboot_table_acpi_init(void)
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{
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return platform_driver_register(&coreboot_table_acpi_driver);
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}
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module_init(coreboot_table_acpi_init);
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MODULE_AUTHOR("Google, Inc.");
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MODULE_LICENSE("GPL");
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