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