From 7a1a44c909fcb4707b01448a28490d7be366b530 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Tue, 21 May 2013 15:50:31 +0200 Subject: [PATCH] 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 Patchwork: http://patchwork.linux-mips.org/patch/8002/ Signed-off-by: Ralf Baechle --- 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 833fa67..a6c9d00 100644 --- a/arch/mips/ralink/Makefile +++ b/arch/mips/ralink/Makefile @@ -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 diff --git a/arch/mips/ralink/bootrom.c b/arch/mips/ralink/bootrom.c new file mode 100644 index 0000000..5403468 --- /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); -- 2.7.4