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From af03898c74172ab16d610f3eeaa65f66401eb7db Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Tue, 21 May 2013 15:50:31 +0200
Subject: [PATCH 04/57] 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 <blogic@openwrt.org>
---
arch/mips/ralink/Makefile | 2 ++
arch/mips/ralink/bootrom.c | 48 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
create mode 100644 arch/mips/ralink/bootrom.c
--- a/arch/mips/ralink/Makefile
+++ b/arch/mips/ralink/Makefile
@@ -17,4 +17,6 @@ obj-$(CONFIG_SOC_MT7620) += mt7620.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+obj-$(CONFIG_DEBUG_FS) += bootrom.o
+
obj-y += dts/
--- /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 <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);
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