MIPS: ralink: add a bootrom dumper module

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>
This commit is contained in:
John Crispin 2013-05-21 15:50:31 +02:00 committed by Ralf Baechle
parent 1e209c969a
commit 7a1a44c909
2 changed files with 50 additions and 0 deletions

View File

@ -18,3 +18,5 @@ obj-$(CONFIG_SOC_RT3883) += rt3883.o
obj-$(CONFIG_SOC_MT7620) += mt7620.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_DEBUG_FS) += bootrom.o

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@ -0,0 +1,48 @@
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*/
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#define BOOTROM_OFFSET 0x10118000
#define BOOTROM_SIZE 0x8000
static void __iomem *membase = (void __iomem *) KSEG1ADDR(BOOTROM_OFFSET);
static int bootrom_show(struct seq_file *s, void *unused)
{
seq_write(s, membase, BOOTROM_SIZE);
return 0;
}
static int bootrom_open(struct inode *inode, struct file *file)
{
return single_open(file, bootrom_show, NULL);
}
static const struct file_operations bootrom_file_ops = {
.open = bootrom_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int bootrom_setup(void)
{
if (!debugfs_create_file("bootrom", 0444,
NULL, NULL, &bootrom_file_ops)) {
pr_err("Failed to create bootrom debugfs file\n");
return -EINVAL;
}
return 0;
}
postcore_initcall(bootrom_setup);