sys/arch/i386/stand/lib/test/pci_user.c

   1 /*      $NetBSD: pci_user.c,v 1.4 2008/12/14 18:46:33 christos Exp $    */
   2
   3 /*
   4  * Copyright (c) 1998
   5  *      Matthias Drochner.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  */
  28
  29 #include "sanamespace.h"
  30
  31 #include <sys/types.h>
  32 #include <machine/pio.h>
  33
  34 #include <pcivar.h>
  35
  36 extern int mapio(void);
  37
  38 /*
  39  * Replacement for i386/stand/lib/biospci.c.
  40  * Very simple functions to access PCI config space from
  41  * userland. Works with configuration mode 1 only, can
  42  * only access bus number 0.
  43  */
  44
  45 #define PCI_MODE1_ENABLE        0x80000000UL
  46 #define PCI_MODE1_ADDRESS_REG   0x0cf8
  47 #define PCI_MODE1_DATA_REG      0x0cfc
  48
  49 static int
  50 maketag(int bus, int dev, int fcn)
  51 {
  52
  53         return PCI_MODE1_ENABLE |
  54             (bus << 16) | (dev << 11) | (fcn << 8);
  55 }
  56
  57 int
  58 pcicheck(void)
  59 {
  60
  61         return mapio() ? -1 : 0;
  62 }
  63
  64 int
  65 pcifinddev(int vid, int did, pcihdl_t *handle)
  66 {
  67         int i;
  68
  69         for (i = 0; i < 32; i++) {
  70                 pcihdl_t h;
  71                 int id;
  72                 h = maketag(0, i, 0);
  73                 pcicfgread(&h, 0, &id);
  74                 if (id == (vid | (did << 16))) {
  75                         *handle = h;
  76                         return 0;
  77                 }
  78         }
  79         return -1;
  80 }
  81
  82 int
  83 pcicfgread(pcihdl_t *handle, int off, int *val)
  84 {
  85         int data;
  86
  87         outl(PCI_MODE1_ADDRESS_REG, *handle | off);
  88         data = inl(PCI_MODE1_DATA_REG);
  89         outl(PCI_MODE1_ADDRESS_REG, 0);
  90         *val = data;
  91         return 0;
  92 }
  93
  94 int
  95 pcicfgwrite(pcihdl_t *handle, int off, int val)
  96 {
  97         outl(PCI_MODE1_ADDRESS_REG, *handle | off);
  98         outl(PCI_MODE1_DATA_REG, val);
  99         outl(PCI_MODE1_ADDRESS_REG, 0);
 100         return 0;
 101 }