arch/mips/basler/excite/excite_procfs.c

   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
  31 static 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
  39 static int
  40 excite_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
  65 void 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 }