LXR linux/arch/mips/basler/excite/excite

   1/*
   2 *  Copyright (C) 2004, 2005 by Basler Vision Technologies AG
   3 *  Author: Thomas Koeller <thomas.koeller@baslerweb.com>
   4 *
   5 *  Procfs support for Basler eXcite
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License as published by
   9 *  the Free Software Foundation; either version 2 of the License, or
  10 *  (at your option) any later version.
  11 *
  12 *  This program is distributed in the hope that it will be useful,
  13 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; if not, write to the Free Software
  19 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 */
  21
  22#include <linux/proc_fs.h>
  23#include <linux/stat.h>
  24#include <asm/page.h>
  25#include <asm/io.h>
  26#include <asm/system.h>
  27#include <asm/rm9k-ocd.h>
  28
  29#include <excite.h>
  30
  31static int excite_get_unit_id(char *buf, char **addr, off_t offs, int size)
  32{
  33        const int len = snprintf(buf, PAGE_SIZE, "%06x", unit_id);
  34        const int w = len - offs;
  35        *addr = buf + offs;
  36        return w < size ? w : size;
  37}
  38
  39static int
  40excite_bootrom_read(char *page, char **start, off_t off, int count,
  41                  int *eof, void *data)
  42{
  43        void __iomem * src;
  44
  45        if (off >= EXCITE_SIZE_BOOTROM) {
  46                *eof = 1;
  47                return 0;
  48        }
  49
  50        if ((off + count) > EXCITE_SIZE_BOOTROM)
  51                count = EXCITE_SIZE_BOOTROM - off;
  52
  53        src = ioremap(EXCITE_PHYS_BOOTROM + off, count);
  54        if (src) {
  55                memcpy_fromio(page, src, count);
  56                iounmap(src);
  57                *start = page;
  58        } else {
  59                count = -ENOMEM;
  60        }
  61
  62        return count;
  63}
  64
  65void excite_procfs_init(void)
  66{
  67        /* Create & populate /proc/excite */
  68        struct proc_dir_entry * const pdir = proc_mkdir("excite", &proc_root);
  69        if (pdir) {
  70                struct proc_dir_entry * e;
  71
  72                e = create_proc_info_entry("unit_id", S_IRUGO, pdir,
  73                                           excite_get_unit_id);
  74                if (e) e->size = 6;
  75
  76                e = create_proc_read_entry("bootrom", S_IRUGO, pdir,
  77                                           excite_bootrom_read, NULL);
  78                if (e) e->size = EXCITE_SIZE_BOOTROM;
  79        }
  80}
  81