arch/tile/gxio/trio.c

   1 /*
   2  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 /*
  16  * Implementation of trio gxio calls.
  17  */
  18
  19 #include <linux/errno.h>
  20 #include <linux/io.h>
  21 #include <linux/module.h>
  22
  23 #include <gxio/trio.h>
  24 #include <gxio/iorpc_globals.h>
  25 #include <gxio/iorpc_trio.h>
  26 #include <gxio/kiorpc.h>
  27
  28 int gxio_trio_init(gxio_trio_context_t *context, unsigned int trio_index)
  29 {
  30         char file[32];
  31         int fd;
  32
  33         snprintf(file, sizeof(file), "trio/%d/iorpc", trio_index);
  34         fd = hv_dev_open((HV_VirtAddr) file, 0);
  35         if (fd < 0) {
  36                 context->fd = -1;
  37
  38                 if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
  39                         return fd;
  40                 else
  41                         return -ENODEV;
  42         }
  43
  44         context->fd = fd;
  45
  46         return 0;
  47 }
  48
  49 EXPORT_SYMBOL_GPL(gxio_trio_init);