forked from Minki/linux
a1d6f9cfc7
This patch expands the Google firmware memory console driver to also work on certain tree based platforms running coreboot, such as ARM/ARM64 Chromebooks. This patch now adds another path to find the coreboot table through the device tree. In order to find that, a second level bootloader must have installed the 'coreboot' compatible device tree node that describes its base address and size. This patch is a rework/split/merge of patches from the chromeos v4.4 kernel tree originally authored by: Wei-Ning Huang <wnhuang@chromium.org> Julius Werner <jwerner@chromium.org> Brian Norris <briannorris@chromium.org> Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
|
|
* coreboot_table-of.c
|
|
*
|
|
* Coreboot table access through open firmware.
|
|
*
|
|
* 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/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include "coreboot_table.h"
|
|
|
|
static int coreboot_table_of_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *fw_dn = pdev->dev.of_node;
|
|
void __iomem *ptr;
|
|
|
|
ptr = of_iomap(fw_dn, 0);
|
|
of_node_put(fw_dn);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
return coreboot_table_init(ptr);
|
|
}
|
|
|
|
static int coreboot_table_of_remove(struct platform_device *pdev)
|
|
{
|
|
return coreboot_table_exit();
|
|
}
|
|
|
|
static const struct of_device_id coreboot_of_match[] = {
|
|
{ .compatible = "coreboot" },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver coreboot_table_of_driver = {
|
|
.probe = coreboot_table_of_probe,
|
|
.remove = coreboot_table_of_remove,
|
|
.driver = {
|
|
.name = "coreboot_table_of",
|
|
.of_match_table = coreboot_of_match,
|
|
},
|
|
};
|
|
|
|
static int __init platform_coreboot_table_of_init(void)
|
|
{
|
|
struct platform_device *pdev;
|
|
struct device_node *of_node;
|
|
|
|
/* Limit device creation to the presence of /firmware/coreboot node */
|
|
of_node = of_find_node_by_path("/firmware/coreboot");
|
|
if (!of_node)
|
|
return -ENODEV;
|
|
|
|
if (!of_match_node(coreboot_of_match, of_node))
|
|
return -ENODEV;
|
|
|
|
pdev = of_platform_device_create(of_node, "coreboot_table_of", NULL);
|
|
if (!pdev)
|
|
return -ENODEV;
|
|
|
|
return platform_driver_register(&coreboot_table_of_driver);
|
|
}
|
|
|
|
module_init(platform_coreboot_table_of_init);
|
|
|
|
MODULE_AUTHOR("Google, Inc.");
|
|
MODULE_LICENSE("GPL");
|