lib/libpci/pci_device.c

   1 /*      $NetBSD: pci_device.c,v 1.2 2003/03/08 09:53:45 lukem Exp $     */
   2
   3 /*
   4  * Copyright 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * Interface to PCI config space registers for a specific PCI device.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __RCSID("$NetBSD: pci_device.c,v 1.2 2003/03/08 09:53:45 lukem Exp $");
  44
  45 #include <sys/types.h>
  46 #include <sys/ioctl.h>
  47
  48 #include <pci.h>
  49
  50 #include <dev/pci/pciio.h>
  51
  52 /*
  53  * pcidev_conf_read:
  54  *
  55  *      Read a config word for a given bus/device/function.
  56  */
  57 int
  58 pcidev_conf_read(int fd, u_int reg, uint32_t *valp)
  59 {
  60         struct pciio_cfgreg r;
  61         int rv;
  62
  63         r.reg = reg;
  64
  65         rv = ioctl(fd, PCI_IOC_CFGREAD, &r);
  66         if (rv == -1) {
  67                 /* errno already set. */
  68                 return (-1);
  69         }
  70
  71         *valp = r.val;
  72         return (0);
  73 }
  74
  75 /*
  76  * pcidev_conf_write:
  77  *
  78  *      Write a config word for a given bus/device/function.
  79  */
  80 int
  81 pcidev_conf_write(int fd, u_int reg, uint32_t val)
  82 {
  83         struct pciio_cfgreg r;
  84
  85         r.reg = reg;
  86         r.val = val;
  87
  88         return (ioctl(fd, PCI_IOC_CFGWRITE, &r));
  89 }