lib/libpci/pci_bus.c

   1 /*      $NetBSD: pci_bus.c,v 1.1 2001/09/13 22:52:20 thorpej 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 PCI domain.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __RCSID("$NetBSD$");
  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  * pcibus_conf_read:
  54  *
  55  *      Read a config word for a given bus/device/function.
  56  */
  57 int
  58 pcibus_conf_read(int fd, u_int bus, u_int device, u_int func, u_int reg,
  59     uint32_t *valp)
  60 {
  61         struct pciio_bdf_cfgreg bdfr;
  62         int rv;
  63
  64         bdfr.bus = bus;
  65         bdfr.device = device;
  66         bdfr.function = func;
  67         bdfr.cfgreg.reg = reg;
  68
  69         rv = ioctl(fd, PCI_IOC_BDF_CFGREAD, &bdfr);
  70         if (rv == -1) {
  71                 /* errno already set. */
  72                 return (-1);
  73         }
  74
  75         *valp = bdfr.cfgreg.val;
  76         return (0);
  77 }
  78
  79 /*
  80  * pcibus_conf_write:
  81  *
  82  *      Write a config word for a given bus/device/function.
  83  */
  84 int
  85 pcibus_conf_write(int fd, u_int bus, u_int device, u_int func, u_int reg,
  86     uint32_t val)
  87 {
  88         struct pciio_bdf_cfgreg bdfr;
  89
  90         bdfr.bus = bus;
  91         bdfr.device = device;
  92         bdfr.function = func;
  93         bdfr.cfgreg.reg = reg;
  94         bdfr.cfgreg.val = val;
  95
  96         return (ioctl(fd, PCI_IOC_BDF_CFGWRITE, &bdfr));
  97 }