/* $NetBSD: alpha_pci_mem.c,v 1.5 2008/04/28 20:22:55 martin Exp $ */

/* $NetBSD: alpha_pci_mem.c,v 1.5 2008/04/28 20:22:55 martin Exp $ */

/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Support for mapping PCI/EISA/ISA memory space. This is currently used
* to provide such support for XFree86. In a perfect world, this would go
* away in favor of a real bus space mapping framework.
*/

#include <sys/param.h>
#include <sys/mman.h>

#include <machine/sysarch.h>

#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

struct alpha_bus_window *alpha_pci_mem_windows;
int alpha_pci_mem_window_count;

void *
alpha_pci_mem_map(bus_addr_t memaddr, bus_size_t memsize, int flags,
struct alpha_bus_space_translation *rabst)
{
struct alpha_bus_window *abw;
void *addr;
int prefetchable = flags & BUS_SPACE_MAP_PREFETCHABLE;
int linear = flags & BUS_SPACE_MAP_LINEAR;
bus_size_t offset;
int i, fd;

/*
* Can't have linear without prefetchable.
*/
if (linear && !prefetchable)
return (MAP_FAILED);

if (alpha_pci_mem_windows == NULL) {
i = alpha_bus_getwindows(ALPHA_BUS_TYPE_PCI_MEM, &abw);
if (i <= 0)
return (MAP_FAILED);

alpha_pci_mem_windows = abw;
alpha_pci_mem_window_count = i;
}

for (i = 0; i < alpha_pci_mem_window_count; i++) {
abw = &alpha_pci_mem_windows[i];
if (memaddr < abw->abw_abst.abst_bus_start ||
(memaddr + (memsize - 1)) > abw->abw_abst.abst_bus_end)
continue;

/*
* Prefetchable memory must be mapped in dense space;
* otherwise use sparse space.
*/
if (prefetchable &&
(abw->abw_abst.abst_flags & ABST_DENSE) == 0)
continue;
if (!prefetchable &&
(abw->abw_abst.abst_flags & ABST_DENSE) != 0)
continue;

/* Looks like we have a winner! */
goto found;
}

/* Not found in any of the windows. */
return (MAP_FAILED);

found:
fd = open(_PATH_MEM, O_RDWR, 0600);
if (fd == -1)
return (MAP_FAILED);

if (prefetchable)
abw->abw_abst.abst_addr_shift = 0;
memsize <<= abw->abw_abst.abst_addr_shift;
offset = (memaddr - abw->abw_abst.abst_bus_start) <<
abw->abw_abst.abst_addr_shift;

addr = mmap(NULL, memsize, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
fd, (off_t) (abw->abw_abst.abst_sys_start + offset));

(void) close(fd);

if (addr != MAP_FAILED) {
/*
* Make a copy of the space translation so that the caller
* can do the correct access.
*/
*rabst = abw->abw_abst;
}
return (addr);
}

void
alpha_pci_mem_unmap(struct alpha_bus_space_translation *abst, void *addr,
bus_size_t size)
{

(void) munmap(addr, size << abst->abst_addr_shift);
}