76 lines
1.9 KiB
Diff
76 lines
1.9 KiB
Diff
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From af03898c74172ab16d610f3eeaa65f66401eb7db Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Tue, 21 May 2013 15:50:31 +0200
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Subject: [PATCH 04/57] MIPS: ralink: adds a bootrom dumper module
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This patch adds a trivial driver that allows userland to extract the bootrom of
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a SoC via debugfs.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/ralink/Makefile | 2 ++
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arch/mips/ralink/bootrom.c | 48 ++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 50 insertions(+)
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create mode 100644 arch/mips/ralink/bootrom.c
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--- a/arch/mips/ralink/Makefile
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+++ b/arch/mips/ralink/Makefile
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@@ -17,4 +17,6 @@ obj-$(CONFIG_SOC_MT7620) += mt7620.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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+obj-$(CONFIG_DEBUG_FS) += bootrom.o
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+
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obj-y += dts/
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--- /dev/null
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+++ b/arch/mips/ralink/bootrom.c
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@@ -0,0 +1,48 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/debugfs.h>
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+#include <linux/seq_file.h>
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+
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+#define BOOTROM_OFFSET 0x10118000
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+#define BOOTROM_SIZE 0x8000
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+
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+static void __iomem *membase = (void __iomem*) KSEG1ADDR(BOOTROM_OFFSET);
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+
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+static int bootrom_show(struct seq_file *s, void *unused)
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+{
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+ seq_write(s, membase, BOOTROM_SIZE);
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+
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+ return 0;
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+}
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+
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+static int bootrom_open(struct inode *inode, struct file *file)
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+{
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+ return single_open(file, bootrom_show, NULL);
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+}
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+
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+static const struct file_operations bootrom_file_ops = {
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+ .open = bootrom_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = single_release,
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+};
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+
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+static int bootrom_setup(void)
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+{
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+ if (!debugfs_create_file("bootrom", 0444,
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+ NULL, NULL, &bootrom_file_ops)) {
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+ pr_err("Failed to create bootrom debugfs file\n");
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+
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+postcore_initcall(bootrom_setup);
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