vidix/sysdep/pci_lynx.c

   1 /*
   2    This file is based on:
   3    $XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
   4    Modified for readability by Nick Kurshev
   5 */
   6 /*
   7  * Copyright 1995 by Robin Cutshaw <robin@XFree86.Org>
   8  *
   9  * Permission to use, copy, modify, distribute, and sell this software and its
  10  * documentation for any purpose is hereby granted without fee, provided that
  11  * the above copyright notice appear in all copies and that both that
  12  * copyright notice and this permission notice appear in supporting
  13  * documentation, and that the names of the above listed copyright holder(s)
  14  * not be used in advertising or publicity pertaining to distribution of
  15  * the software without specific, written prior permission.  The above listed
  16  * copyright holder(s) make(s) no representations about the suitability of this
  17  * software for any purpose.  It is provided "as is" without express or
  18  * implied warranty.
  19  *
  20  * THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM(S) ALL WARRANTIES WITH REGARD
  21  * TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  22  * AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
  23  * LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
  24  * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  25  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  26  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  27  */
  28
  29 #if defined(Lynx_22)
  30 #ifndef GCCUSESGAS
  31 #define GCCUSESGAS
  32 #endif
  33
  34 /* let's mimick the Linux Alpha stuff for LynxOS so we don't have
  35  * to change too much code
  36  */
  37 #include <smem.h>
  38
  39 static unsigned char *pciConfBase;
  40
  41 static __inline__ void enable_os_io(void)
  42 {
  43     pciConfBase = (unsigned char *) smem_create("PCI-CONF",
  44             (char *)0x80800000, 64*1024, SM_READ|SM_WRITE);
  45     if (pciConfBase == (void *) -1)
  46         exit(1);
  47 }
  48
  49 static __inline__ void disable_os_io(void)
  50 {
  51     smem_create(NULL, (char *) pciConfBase, 0, SM_DETACH);
  52     smem_remove("PCI-CONF");
  53     pciConfBase = NULL;
  54 }
  55
  56 #include <smem.h>
  57
  58 static unsigned char *pciConfBase;
  59
  60 static __inline__ unsigned long
  61 static swapl(unsigned long val)
  62 {
  63         unsigned char *p = (unsigned char *)&val;
  64         return (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | (p[0] << 0);
  65 }
  66
  67
  68 #define BUS(tag) (((tag)>>16)&0xff)
  69 #define DFN(tag) (((tag)>>8)&0xff)
  70
  71 #define PCIBIOS_DEVICE_NOT_FOUND        0x86
  72 #define PCIBIOS_SUCCESSFUL              0x00
  73
  74 static int pciconfig_read(
  75           unsigned char bus,
  76           unsigned char dev,
  77           unsigned char offset,
  78           int len,              /* unused, alway 4 */
  79           unsigned long *val)
  80 {
  81         unsigned long _val;
  82         unsigned long *ptr;
  83
  84         dev >>= 3;
  85         if (bus || dev >= 16) {
  86                 *val = 0xFFFFFFFF;
  87                 return PCIBIOS_DEVICE_NOT_FOUND;
  88         } else {
  89                 ptr = (unsigned long *)(pciConfBase + ((1<<dev) | offset));
  90                 _val = swapl(*ptr);
  91         }
  92         *val = _val;
  93         return PCIBIOS_SUCCESSFUL;
  94 }
  95
  96 static int pciconfig_write(
  97           unsigned char bus,
  98           unsigned char dev,
  99           unsigned char offset,
 100           int len,              /* unused, alway 4 */
 101           unsigned long val)
 102 {
 103         unsigned long _val;
 104         unsigned long *ptr;
 105
 106         dev >>= 3;
 107         _val = swapl(val);
 108         if (bus || dev >= 16) {
 109                 return PCIBIOS_DEVICE_NOT_FOUND;
 110         } else {
 111                 ptr = (unsigned long *)(pciConfBase + ((1<<dev) | offset));
 112                 *ptr = _val;
 113         }
 114         return PCIBIOS_SUCCESSFUL;
 115 }