bus_private.h revision 167308 
1/*-
2 * Copyright (c) 1997, 1998 Justin T. Gibbs.
3 * Copyright (c) 2002 by Thomas Moestl <tmm@FreeBSD.org>.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
24 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 *	from: FreeBSD: src/sys/i386/i386/busdma_machdep.c,v 1.25 2002/01/05
27 *
28 * $FreeBSD: head/sys/sparc64/include/bus_private.h 167308 2007-03-07 21:13:51Z marius $
29 */
30
31#ifndef	_MACHINE_BUS_PRIVATE_H_
32#define	_MACHINE_BUS_PRIVATE_H_
33
34#include <sys/queue.h>
35
36/*
37 * Helpers
38 */
39int sparc64_bus_mem_map(bus_space_tag_t, bus_space_handle_t, bus_size_t,
40    int, vm_offset_t, void **);
41int sparc64_bus_mem_unmap(void *, bus_size_t);
42bus_space_handle_t sparc64_fake_bustag(int, bus_addr_t, struct bus_space_tag *);
43
44struct bus_dmamap_res {
45	struct resource		*dr_res;
46	bus_size_t		dr_used;
47	SLIST_ENTRY(bus_dmamap_res)	dr_link;
48};
49
50/*
51 * Callers of the bus_dma interfaces must always protect their tags and maps
52 * appropriately against concurrent access. However, when a map is on a LRU
53 * queue, there is a second access path to it; for this case, the locking rules
54 * are given in the parenthesized comments below:
55 *	q - locked by the mutex protecting the queue.
56 *	p - private to the owner of the map, no access through the queue.
57 *	* - comment refers to pointer target.
58 * Only the owner of the map is allowed to insert the map into a queue. Removal
59 * and repositioning (i.e. temporal removal and reinsertion) is allowed to all
60 * if the queue lock is held.
61 */
62struct bus_dmamap {
63	TAILQ_ENTRY(bus_dmamap)	dm_maplruq;		/* (q) */
64	SLIST_HEAD(, bus_dmamap_res)	dm_reslist;	/* (q, *q) */
65	int			dm_onq;			/* (q) */
66	int			dm_flags;		/* (p) */
67};
68
69/* Flag values. */
70#define	DMF_LOADED	1	/* Map is loaded */
71#define	DMF_COHERENT	2	/* Coherent mapping requested */
72
73int sparc64_dma_alloc_map(bus_dma_tag_t dmat, bus_dmamap_t *mapp);
74void sparc64_dma_free_map(bus_dma_tag_t dmat, bus_dmamap_t map);
75
76#endif /* !_MACHINE_BUS_PRIVATE_H_ */
77