target/linux/ramips/patches-3.14/0004-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 diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile
  17 index 98ae349..584a8d9 100644
  18 --- a/arch/mips/ralink/Makefile
  19 +++ b/arch/mips/ralink/Makefile
  20 @@ -17,4 +17,6 @@ obj-$(CONFIG_SOC_MT7620) += mt7620.o
  21
  22  obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
  23
  24 +obj-$(CONFIG_DEBUG_FS) += bootrom.o
  25 +
  26  obj-y += dts/
  27 diff --git a/arch/mips/ralink/bootrom.c b/arch/mips/ralink/bootrom.c
  28 new file mode 100644
  29 index 0000000..f926f6f
  30 --- /dev/null
  31 +++ b/arch/mips/ralink/bootrom.c
  32 @@ -0,0 +1,48 @@
  33 +/*
  34 + * This program is free software; you can redistribute it and/or modify it
  35 + * under the terms of the GNU General Public License version 2 as published
  36 + * by the Free Software Foundation.
  37 + *
  38 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  39 + */
  40 +
  41 +#include <linux/debugfs.h>
  42 +#include <linux/seq_file.h>
  43 +
  44 +#define BOOTROM_OFFSET 0x10118000
  45 +#define BOOTROM_SIZE   0x8000
  46 +
  47 +static void __iomem *membase = (void __iomem*) KSEG1ADDR(BOOTROM_OFFSET);
  48 +
  49 +static int bootrom_show(struct seq_file *s, void *unused)
  50 +{
  51 +       seq_write(s, membase, BOOTROM_SIZE);
  52 +
  53 +       return 0;
  54 +}
  55 +
  56 +static int bootrom_open(struct inode *inode, struct file *file)
  57 +{
  58 +       return single_open(file, bootrom_show, NULL);
  59 +}
  60 +
  61 +static const struct file_operations bootrom_file_ops = {
  62 +       .open           = bootrom_open,
  63 +       .read           = seq_read,
  64 +       .llseek         = seq_lseek,
  65 +       .release        = single_release,
  66 +};
  67 +
  68 +static int bootrom_setup(void)
  69 +{
  70 +       if (!debugfs_create_file("bootrom", 0444,
  71 +                       NULL, NULL, &bootrom_file_ops)) {
  72 +               pr_err("Failed to create bootrom debugfs file\n");
  73 +
  74 +               return -EINVAL;
  75 +       }
  76 +
  77 +       return 0;
  78 +}
  79 +
  80 +postcore_initcall(bootrom_setup);
  81 --
  82 1.7.10.4
  83