/*
   This file is based on:
   $XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
   Modified for readability by Nick Kurshev
*/
/*
 * Copyright 1995 by Robin Cutshaw <robin@XFree86.Org>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the names of the above listed copyright holder(s)
 * not be used in advertising or publicity pertaining to distribution of
 * the software without specific, written prior permission.  The above listed
 * copyright holder(s) make(s) no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without express or
 * implied warranty.
 *
 * THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM(S) ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
 * LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#if defined(Lynx_22)
#ifndef GCCUSESGAS
#define GCCUSESGAS
#endif

/* let's mimick the Linux Alpha stuff for LynxOS so we don't have
 * to change too much code
 */
#include <smem.h>

static unsigned char *pciConfBase;

static __inline__ void enable_os_io(void)
{
    pciConfBase = (unsigned char *) smem_create("PCI-CONF",
    	    (char *)0x80800000, 64*1024, SM_READ|SM_WRITE);
    if (pciConfBase == (void *) -1)
        exit(1);
}

static __inline__ void disable_os_io(void)
{
    smem_create(NULL, (char *) pciConfBase, 0, SM_DETACH);
    smem_remove("PCI-CONF");
    pciConfBase = NULL;
}

#include <smem.h>

static unsigned char *pciConfBase;

static __inline__ unsigned long
static swapl(unsigned long val)
{
	unsigned char *p = (unsigned char *)&val;
	return (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | (p[0] << 0);
}


#define BUS(tag) (((tag)>>16)&0xff)
#define DFN(tag) (((tag)>>8)&0xff)

#define PCIBIOS_DEVICE_NOT_FOUND	0x86
#define PCIBIOS_SUCCESSFUL		0x00

static int pciconfig_read(
          unsigned char bus,
          unsigned char dev,
          unsigned char offset,
          int len,		/* unused, alway 4 */
          unsigned long *val)
{
	unsigned long _val;
	unsigned long *ptr;

	dev >>= 3;
	if (bus || dev >= 16) {
		*val = 0xFFFFFFFF;
		return PCIBIOS_DEVICE_NOT_FOUND;
	} else {
		ptr = (unsigned long *)(pciConfBase + ((1<<dev) | offset));
		_val = swapl(*ptr);
	}
	*val = _val;
	return PCIBIOS_SUCCESSFUL;
}

static int pciconfig_write(
          unsigned char bus,
          unsigned char dev,
          unsigned char offset,
          int len,		/* unused, alway 4 */
          unsigned long val)
{
	unsigned long _val;
	unsigned long *ptr;

	dev >>= 3;
	_val = swapl(val);
	if (bus || dev >= 16) {
		return PCIBIOS_DEVICE_NOT_FOUND;
	} else {
		ptr = (unsigned long *)(pciConfBase + ((1<<dev) | offset));
		*ptr = _val;
	}
	return PCIBIOS_SUCCESSFUL;
}
