Commit 7a1a44c9 authored by John Crispin's avatar John Crispin Committed by Ralf Baechle
Browse files

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: default avatarJohn Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/8002/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 1e209c96

arch/mips/ralink/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/mips/ralink/bootrom.c

0 → 100644
+48 −0
Original line number Diff line number Diff line 
/*

 * 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);