1/*	$NetBSD: alpha_pci_mem.c,v 1.4 2002/07/19 22:03:39 mycroft Exp $	*/
2
3/*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Support for mapping PCI/EISA/ISA memory space.  This is currently used
34 * to provide such support for XFree86.  In a perfect world, this would go
35 * away in favor of a real bus space mapping framework.
36 */
37
38#include <sys/param.h>
39#include <sys/mman.h>
40
41#include <machine/sysarch.h>
42
43#include <fcntl.h>
44#include <paths.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49struct alpha_bus_window *alpha_pci_mem_windows;
50int alpha_pci_mem_window_count;
51
52void *
53alpha_pci_mem_map(bus_addr_t memaddr, bus_size_t memsize, int flags,
54    struct alpha_bus_space_translation *rabst)
55{
56	struct alpha_bus_window *abw;
57	void *addr;
58	int prefetchable = flags & BUS_SPACE_MAP_PREFETCHABLE;
59	int linear = flags & BUS_SPACE_MAP_LINEAR;
60	bus_size_t offset;
61	int i, fd;
62
63	/*
64	 * Can't have linear without prefetchable.
65	 */
66	if (linear && !prefetchable)
67		return (MAP_FAILED);
68
69	if (alpha_pci_mem_windows == NULL) {
70		i = alpha_bus_getwindows(ALPHA_BUS_TYPE_PCI_MEM, &abw);
71		if (i <= 0)
72			return (MAP_FAILED);
73
74		alpha_pci_mem_windows = abw;
75		alpha_pci_mem_window_count = i;
76	}
77
78	for (i = 0; i < alpha_pci_mem_window_count; i++) {
79		abw = &alpha_pci_mem_windows[i];
80		if (memaddr < abw->abw_abst.abst_bus_start ||
81		    (memaddr + (memsize - 1)) > abw->abw_abst.abst_bus_end)
82			continue;
83
84		/*
85		 * Prefetchable memory must be mapped in dense space;
86		 * otherwise use sparse space.
87		 */
88		if (prefetchable &&
89		    (abw->abw_abst.abst_flags & ABST_DENSE) == 0)
90			continue;
91		if (!prefetchable &&
92		    (abw->abw_abst.abst_flags & ABST_DENSE) != 0)
93			continue;
94
95		/* Looks like we have a winner! */
96		goto found;
97	}
98
99	/* Not found in any of the windows. */
100	return (MAP_FAILED);
101
102 found:
103	fd = open(_PATH_MEM, O_RDWR, 0600);
104	if (fd == -1)
105		return (MAP_FAILED);
106
107	if (prefetchable)
108		abw->abw_abst.abst_addr_shift = 0;
109	memsize <<= abw->abw_abst.abst_addr_shift;
110	offset = (memaddr - abw->abw_abst.abst_bus_start) <<
111	    abw->abw_abst.abst_addr_shift;
112
113	addr = mmap(NULL, memsize, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
114	    fd, (off_t) (abw->abw_abst.abst_sys_start + offset));
115
116	(void) close(fd);
117
118	if (addr != MAP_FAILED) {
119		/*
120		 * Make a copy of the space translation so that the caller
121		 * can do the correct access.
122		 */
123		*rabst = abw->abw_abst;
124	}
125	return (addr);
126}
127
128void
129alpha_pci_mem_unmap(struct alpha_bus_space_translation *abst, void *addr,
130    bus_size_t size)
131{
132
133	(void) munmap(addr, size << abst->abst_addr_shift);
134}
135