7a1a44c909
This patch adds a trivial driver that allows userland to extract the bootrom of a SoC via debugfs. Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/8002/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
48 lines
1 KiB
C
48 lines
1 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#define BOOTROM_OFFSET 0x10118000
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#define BOOTROM_SIZE 0x8000
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static void __iomem *membase = (void __iomem *) KSEG1ADDR(BOOTROM_OFFSET);
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static int bootrom_show(struct seq_file *s, void *unused)
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{
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seq_write(s, membase, BOOTROM_SIZE);
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return 0;
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}
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static int bootrom_open(struct inode *inode, struct file *file)
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{
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return single_open(file, bootrom_show, NULL);
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}
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static const struct file_operations bootrom_file_ops = {
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.open = bootrom_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int bootrom_setup(void)
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{
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if (!debugfs_create_file("bootrom", 0444,
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NULL, NULL, &bootrom_file_ops)) {
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pr_err("Failed to create bootrom debugfs file\n");
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return -EINVAL;
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}
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return 0;
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}
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postcore_initcall(bootrom_setup);
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