bus_dma.h revision 188350
1/*	$NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $	*/
2
3/*-
4 * Copyright (c) 1996, 1997 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 of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the NetBSD
22 *	Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 *    contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40/*-
41 * Copyright (c) 1996 Charles M. Hannum.  All rights reserved.
42 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 *    notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 *    notice, this list of conditions and the following disclaimer in the
51 *    documentation and/or other materials provided with the distribution.
52 * 3. All advertising materials mentioning features or use of this software
53 *    must display the following acknowledgement:
54 *      This product includes software developed by Christopher G. Demetriou
55 *	for the NetBSD Project.
56 * 4. The name of the author may not be used to endorse or promote products
57 *    derived from this software without specific prior written permission
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
60 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
61 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
62 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
63 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
64 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
65 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
66 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
67 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
68 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
69 */
70/* $FreeBSD: head/sys/sys/bus_dma.h 188350 2009-02-08 22:54:58Z imp $ */
71
72#ifndef _BUS_DMA_H_
73#define _BUS_DMA_H_
74
75#include <sys/_bus_dma.h>
76
77/*
78 * Machine independent interface for mapping physical addresses to peripheral
79 * bus 'physical' addresses, and assisting with DMA operations.
80 *
81 * XXX This file is always included from <machine/bus_dma.h> and should not
82 *     (yet) be included directly.
83 */
84
85/*
86 * Flags used in various bus DMA methods.
87 */
88#define	BUS_DMA_WAITOK		0x00	/* safe to sleep (pseudo-flag) */
89#define	BUS_DMA_NOWAIT		0x01	/* not safe to sleep */
90#define	BUS_DMA_ALLOCNOW	0x02	/* perform resource allocation now */
91#define	BUS_DMA_COHERENT	0x04	/* hint: map memory in a coherent way */
92#define	BUS_DMA_ZERO		0x08	/* allocate zero'ed memory */
93#define	BUS_DMA_BUS1		0x10	/* placeholders for bus functions... */
94#define	BUS_DMA_BUS2		0x20
95#define	BUS_DMA_BUS3		0x40
96#define	BUS_DMA_BUS4		0x80
97
98/*
99 * The following two flags are non-standard or specific to only certain
100 * architectures
101 */
102#define	BUS_DMA_NOWRITE		0x100
103#define	BUS_DMA_NOCACHE		0x200
104
105/*
106 * The following flag is a DMA tag hint that the page offset of the
107 * loaded kernel virtual address must be preserved in the first
108 * physical segment address, when the KVA is loaded into DMA.
109 */
110#define	BUS_DMA_KEEP_PG_OFFSET	0x400
111
112/* Forwards needed by prototypes below. */
113struct mbuf;
114struct uio;
115
116/*
117 * Operations performed by bus_dmamap_sync().
118 */
119#define	BUS_DMASYNC_PREREAD	1
120#define	BUS_DMASYNC_POSTREAD	2
121#define	BUS_DMASYNC_PREWRITE	4
122#define	BUS_DMASYNC_POSTWRITE	8
123
124/*
125 *	bus_dma_segment_t
126 *
127 *	Describes a single contiguous DMA transaction.  Values
128 *	are suitable for programming into DMA registers.
129 */
130typedef struct bus_dma_segment {
131	bus_addr_t	ds_addr;	/* DMA address */
132	bus_size_t	ds_len;		/* length of transfer */
133} bus_dma_segment_t;
134
135/*
136 * A function that returns 1 if the address cannot be accessed by
137 * a device and 0 if it can be.
138 */
139typedef int bus_dma_filter_t(void *, bus_addr_t);
140
141/*
142 * Generic helper function for manipulating mutexes.
143 */
144void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op);
145
146/*
147 * Allocate a device specific dma_tag encapsulating the constraints of
148 * the parent tag in addition to other restrictions specified:
149 *
150 *	alignment:	Alignment for segments.
151 *	boundary:	Boundary that segments cannot cross.
152 *	lowaddr:	Low restricted address that cannot appear in a mapping.
153 *	highaddr:	High restricted address that cannot appear in a mapping.
154 *	filtfunc:	An optional function to further test if an address
155 *			within the range of lowaddr and highaddr cannot appear
156 *			in a mapping.
157 *	filtfuncarg:	An argument that will be passed to filtfunc in addition
158 *			to the address to test.
159 *	maxsize:	Maximum mapping size supported by this tag.
160 *	nsegments:	Number of discontinuities allowed in maps.
161 *	maxsegsz:	Maximum size of a segment in the map.
162 *	flags:		Bus DMA flags.
163 *	lockfunc:	An optional function to handle driver-defined lock
164 *			operations.
165 *	lockfuncarg:	An argument that will be passed to lockfunc in addition
166 *			to the lock operation.
167 *	dmat:		A pointer to set to a valid dma tag should the return
168 *			value of this function indicate success.
169 */
170/* XXX Should probably allow specification of alignment */
171int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
172		       bus_size_t boundary, bus_addr_t lowaddr,
173		       bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
174		       void *filtfuncarg, bus_size_t maxsize, int nsegments,
175		       bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
176		       void *lockfuncarg, bus_dma_tag_t *dmat);
177
178int bus_dma_tag_destroy(bus_dma_tag_t dmat);
179
180/*
181 * A function that processes a successfully loaded dma map or an error
182 * from a delayed load map.
183 */
184typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
185
186/*
187 * Like bus_dmamap_callback but includes map size in bytes.  This is
188 * defined as a separate interface to maintain compatibility for users
189 * of bus_dmamap_callback_t--at some point these interfaces should be merged.
190 */
191typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
192
193/*
194 * XXX sparc64 uses the same interface, but a much different implementation.
195 *     <machine/bus_dma.h> for the sparc64 arch contains the equivalent
196 *     declarations.
197 */
198#if !defined(__sparc64__)
199
200/*
201 * Allocate a handle for mapping from kva/uva/physical
202 * address space into bus device space.
203 */
204int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
205
206/*
207 * Destroy a handle for mapping from kva/uva/physical
208 * address space into bus device space.
209 */
210int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
211
212/*
213 * Allocate a piece of memory that can be efficiently mapped into
214 * bus device space based on the constraints listed in the dma tag.
215 * A dmamap to for use with dmamap_load is also allocated.
216 */
217int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
218		     bus_dmamap_t *mapp);
219
220/*
221 * Free a piece of memory and its allocated dmamap, that was allocated
222 * via bus_dmamem_alloc.
223 */
224void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
225
226/*
227 * Map the buffer buf into bus space using the dmamap map.
228 */
229int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
230		    bus_size_t buflen, bus_dmamap_callback_t *callback,
231		    void *callback_arg, int flags);
232
233/*
234 * Like bus_dmamap_load but for mbufs.  Note the use of the
235 * bus_dmamap_callback2_t interface.
236 */
237int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
238			 struct mbuf *mbuf,
239			 bus_dmamap_callback2_t *callback, void *callback_arg,
240			 int flags);
241
242int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
243			    struct mbuf *mbuf, bus_dma_segment_t *segs,
244			    int *nsegs, int flags);
245
246/*
247 * Like bus_dmamap_load but for uios.  Note the use of the
248 * bus_dmamap_callback2_t interface.
249 */
250int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
251			struct uio *ui,
252			bus_dmamap_callback2_t *callback, void *callback_arg,
253			int flags);
254
255/*
256 * Perform a synchronization operation on the given map.
257 */
258void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
259#define bus_dmamap_sync(dmat, dmamap, op) 			\
260	do {							\
261		if ((dmamap) != NULL)				\
262			_bus_dmamap_sync(dmat, dmamap, op);	\
263	} while (0)
264
265/*
266 * Release the mapping held by map.
267 */
268void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
269#define bus_dmamap_unload(dmat, dmamap) 			\
270	do {							\
271		if ((dmamap) != NULL)				\
272			_bus_dmamap_unload(dmat, dmamap);	\
273	} while (0)
274
275#endif /* __sparc64__ */
276
277#endif /* _BUS_DMA_H_ */
278