1 /* $NetBSD: alpha_pci_mem.c,v 1.5 2008/04/28 20:22:55 martin 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
49 struct alpha_bus_window *alpha_pci_mem_windows;
50 int alpha_pci_mem_window_count;
51
52 void *
alpha_pci_mem_map(bus_addr_t memaddr,bus_size_t memsize,int flags,struct alpha_bus_space_translation * rabst)53 alpha_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
128 void
alpha_pci_mem_unmap(struct alpha_bus_space_translation * abst,void * addr,bus_size_t size)129 alpha_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