/*
 * Copyright 1992 by Rich Murphey <Rich@Rice.edu>
 * Copyright 1993 by David Wexelblat <dwex@goblin.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 Rich Murphey and David Wexelblat 
 * not be used in advertising or publicity pertaining to distribution of 
 * the software without specific, written prior permission.  Rich Murphey and
 * David Wexelblat make no representations about the suitability of this 
 * software for any purpose.  It is provided "as is" without express or 
 * implied warranty.
 *
 * RICH MURPHEY AND DAVID WEXELBLAT DISCLAIM ALL WARRANTIES WITH REGARD TO 
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND 
 * FITNESS, IN NO EVENT SHALL RICH MURPHEY OR DAVID WEXELBLAT 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.
 *
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include <X11/X.h>
#include "xf86.h"
#include "xf86Priv.h"

#include "xf86_OSlib.h"
#include "xf86OSpriv.h"

#include "bus/Pci.h"

/***************************************************************************/
/* Video Memory Mapping section                                            */
/***************************************************************************/

#ifdef __OpenBSD__
#define DEV_MEM "/dev/xf86"
#endif

static void *ppcMapVidMem(int, unsigned long, unsigned long, int flags);
static void ppcUnmapVidMem(int, void *, unsigned long);

Bool xf86EnableIO(void);
void xf86DisableIO(void);

void
xf86OSInitVidMem(VidMemInfoPtr pVidMem)
{
    pVidMem->linearSupported = TRUE;
    pVidMem->mapMem = ppcMapVidMem;
    pVidMem->unmapMem = ppcUnmapVidMem;
    pVidMem->initialised = TRUE;
    xf86EnableIO();
}

volatile unsigned char *ioBase = MAP_FAILED;

static void *
ppcMapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags)
{
    int fd = xf86Info.consoleFd;
    void *base;

#ifdef DEBUG
    xf86MsgVerb(X_INFO, 3, "mapVidMem %lx, %lx, fd = %d", Base, Size, fd);
#endif

    base = mmap(0, Size,
                (flags & VIDMEM_READONLY) ?
                PROT_READ : (PROT_READ | PROT_WRITE), MAP_SHARED, fd, Base);
    if (base == MAP_FAILED)
        FatalError("%s: could not mmap screen [s=%x,a=%x] (%s)",
                   "xf86MapVidMem", Size, Base, strerror(errno));

    return base;
}

static void
ppcUnmapVidMem(int ScreenNum, void *Base, unsigned long Size)
{
    munmap(Base, Size);
}

int
xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
             int Len)
{
    int rv;
    static int kmem = -1;

    if (kmem == -1) {
        kmem = open(DEV_MEM, 2);
        if (kmem == -1) {
            FatalError("xf86ReadBIOS: open %s", DEV_MEM);
        }
    }

#ifdef DEBUG
    xf86MsgVerb(X_INFO, 3, "xf86ReadBIOS() %lx %lx, %x\n", Base, Offset, Len);
#endif

    lseek(kmem, Base + Offset, 0);
    rv = read(kmem, Buf, Len);

    return rv;
}

Bool
xf86EnableIO()
{
    int fd = xf86Info.consoleFd;

    xf86MsgVerb(X_WARNING, 3, "xf86EnableIO %d\n", fd);
    if (ioBase == MAP_FAILED) {
        ioBase = mmap(NULL, 0x10000, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
                      0xf2000000);
        xf86MsgVerb(X_INFO, 3, "xf86EnableIO: %08x\n", ioBase);
        if (ioBase == MAP_FAILED) {
            xf86MsgVerb(X_WARNING, 3, "Can't map IO space!\n");
            return FALSE;
        }
    }
    return TRUE;
}

void
xf86DisableIO()
{

    if (ioBase != MAP_FAILED) {
        munmap(__UNVOLATILE(ioBase), 0x10000);
        ioBase = MAP_FAILED;
    }
}