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 KiB
C
83 lines
2 KiB
C
/*
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* coreboot_table-of.c
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*
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* Coreboot table access through open firmware.
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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/device.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.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_of_probe(struct platform_device *pdev)
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{
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struct device_node *fw_dn = pdev->dev.of_node;
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void __iomem *ptr;
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ptr = of_iomap(fw_dn, 0);
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of_node_put(fw_dn);
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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_of_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 of_device_id coreboot_of_match[] = {
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{ .compatible = "coreboot" },
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{},
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};
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static struct platform_driver coreboot_table_of_driver = {
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.probe = coreboot_table_of_probe,
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.remove = coreboot_table_of_remove,
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.driver = {
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.name = "coreboot_table_of",
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.of_match_table = coreboot_of_match,
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},
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};
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static int __init platform_coreboot_table_of_init(void)
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{
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struct platform_device *pdev;
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struct device_node *of_node;
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/* Limit device creation to the presence of /firmware/coreboot node */
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of_node = of_find_node_by_path("/firmware/coreboot");
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if (!of_node)
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return -ENODEV;
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if (!of_match_node(coreboot_of_match, of_node))
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return -ENODEV;
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pdev = of_platform_device_create(of_node, "coreboot_table_of", NULL);
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if (!pdev)
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return -ENODEV;
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return platform_driver_register(&coreboot_table_of_driver);
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}
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module_init(platform_coreboot_table_of_init);
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MODULE_AUTHOR("Google, Inc.");
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MODULE_LICENSE("GPL");
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