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authorJohn Crispin <blogic@openwrt.org>2013-05-21 15:50:31 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-11-24 07:45:22 +0100
commit7a1a44c909fcb4707b01448a28490d7be366b530 (patch)
treeb432ae4a7b020a31401e1b0ed280a4a0ee9c3557 /arch/mips/ralink
parent1e209c969a40c1eeb789515d01d8dd1427982a54 (diff)
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 <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/8002/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/ralink')
-rw-r--r--arch/mips/ralink/Makefile2
-rw-r--r--arch/mips/ralink/bootrom.c48
2 files changed, 50 insertions, 0 deletions
diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile
index 833fa677e6b8..a6c9d0061326 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 000000000000..5403468394fb
--- /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);