mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
570d30c282
This simplifies creating device drivers for hardware or information described in the coreboot table. It also avoids needing to search through the table every time a driver is loaded. Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
|
|
* 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");
|