arch/mips/ralink/bootrom.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify it
   3  * under the terms of the GNU General Public License version 2 as published
   4  * by the Free Software Foundation.
   5  *
   6  * Copyright (C) 2013 John Crispin <john@phrozen.org>
   7  */
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/seq_file.h>
  11
  12 #define BOOTROM_OFFSET  0x10118000
  13 #define BOOTROM_SIZE    0x8000
  14
  15 static void __iomem *membase = (void __iomem *) KSEG1ADDR(BOOTROM_OFFSET);
  16
  17 static int bootrom_show(struct seq_file *s, void *unused)
  18 {
  19         seq_write(s, membase, BOOTROM_SIZE);
  20
  21         return 0;
  22 }
  23
  24 static int bootrom_open(struct inode *inode, struct file *file)
  25 {
  26         return single_open(file, bootrom_show, NULL);
  27 }
  28
  29 static const struct file_operations bootrom_file_ops = {
  30         .open           = bootrom_open,
  31         .read           = seq_read,
  32         .llseek         = seq_lseek,
  33         .release        = single_release,
  34 };
  35
  36 static int bootrom_setup(void)
  37 {
  38         if (!debugfs_create_file("bootrom", 0444,
  39                         NULL, NULL, &bootrom_file_ops)) {
  40                 pr_err("Failed to create bootrom debugfs file\n");
  41
  42                 return -EINVAL;
  43         }
  44
  45         return 0;
  46 }
  47
  48 postcore_initcall(bootrom_setup);