target/linux/ramips/patches-3.18/0004-MIPS-ralink-adds-a-bootrom-dumper-module.patch

   1 From af03898c74172ab16d610f3eeaa65f66401eb7db Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Tue, 21 May 2013 15:50:31 +0200
   4 Subject: [PATCH 04/57] MIPS: ralink: adds a bootrom dumper module
   5
   6 This patch adds a trivial driver that allows userland to extract the bootrom of
   7 a SoC via debugfs.
   8
   9 Signed-off-by: John Crispin <blogic@openwrt.org>
  10 ---
  11  arch/mips/ralink/Makefile  |    2 ++
  12  arch/mips/ralink/bootrom.c |   48 ++++++++++++++++++++++++++++++++++++++++++++
  13  2 files changed, 50 insertions(+)
  14  create mode 100644 arch/mips/ralink/bootrom.c
  15
  16 --- a/arch/mips/ralink/Makefile
  17 +++ b/arch/mips/ralink/Makefile
  18 @@ -16,3 +16,5 @@ obj-$(CONFIG_SOC_RT3883) += rt3883.o
  19  obj-$(CONFIG_SOC_MT7620) += mt7620.o
  20
  21  obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
  22 +
  23 +obj-$(CONFIG_DEBUG_FS) += bootrom.o
  24 --- /dev/null
  25 +++ b/arch/mips/ralink/bootrom.c
  26 @@ -0,0 +1,48 @@
  27 +/*
  28 + * This program is free software; you can redistribute it and/or modify it
  29 + * under the terms of the GNU General Public License version 2 as published
  30 + * by the Free Software Foundation.
  31 + *
  32 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  33 + */
  34 +
  35 +#include <linux/debugfs.h>
  36 +#include <linux/seq_file.h>
  37 +
  38 +#define BOOTROM_OFFSET 0x10118000
  39 +#define BOOTROM_SIZE   0x8000
  40 +
  41 +static void __iomem *membase = (void __iomem*) KSEG1ADDR(BOOTROM_OFFSET);
  42 +
  43 +static int bootrom_show(struct seq_file *s, void *unused)
  44 +{
  45 +       seq_write(s, membase, BOOTROM_SIZE);
  46 +
  47 +       return 0;
  48 +}
  49 +
  50 +static int bootrom_open(struct inode *inode, struct file *file)
  51 +{
  52 +       return single_open(file, bootrom_show, NULL);
  53 +}
  54 +
  55 +static const struct file_operations bootrom_file_ops = {
  56 +       .open           = bootrom_open,
  57 +       .read           = seq_read,
  58 +       .llseek         = seq_lseek,
  59 +       .release        = single_release,
  60 +};
  61 +
  62 +static int bootrom_setup(void)
  63 +{
  64 +       if (!debugfs_create_file("bootrom", 0444,
  65 +                       NULL, NULL, &bootrom_file_ops)) {
  66 +               pr_err("Failed to create bootrom debugfs file\n");
  67 +
  68 +               return -EINVAL;
  69 +       }
  70 +
  71 +       return 0;
  72 +}
  73 +
  74 +postcore_initcall(bootrom_setup);