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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /drivers/firmware/google/coreboot_table-acpi.c | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/google/coreboot_table-acpi.c')
-rw-r--r-- | drivers/firmware/google/coreboot_table-acpi.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/firmware/google/coreboot_table-acpi.c b/drivers/firmware/google/coreboot_table-acpi.c new file mode 100644 index 000000000..77197fe3d --- /dev/null +++ b/drivers/firmware/google/coreboot_table-acpi.c @@ -0,0 +1,88 @@ +/* + * 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(&pdev->dev, 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"); |