From 71409a190a0c8e3597cae7d46321742e29d8994b Mon Sep 17 00:00:00 2001 From: John Crispin Date: Tue, 21 May 2013 15:50:31 +0200 Subject: [PATCH 07/33] MIPS: ralink: adds 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 --- arch/mips/ralink/Makefile | 2 ++ arch/mips/ralink/bootrom.c | 48 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) create mode 100644 arch/mips/ralink/bootrom.c diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile index cae7d88..5fa6129 100644 --- a/arch/mips/ralink/Makefile +++ b/arch/mips/ralink/Makefile @@ -15,4 +15,6 @@ obj-$(CONFIG_SOC_MT7620) += mt7620.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o +obj-$(CONFIG_DEBUG_FS) += bootrom.o + obj-y += dts/ diff --git a/arch/mips/ralink/bootrom.c b/arch/mips/ralink/bootrom.c new file mode 100644 index 0000000..f926f6f --- /dev/null +++ b/arch/mips/ralink/bootrom.c @@ -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 + */ + +#include +#include + +#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); -- 1.7.10.4