2 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
7 * NASA Ames Research Center.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the NetBSD
20 * Foundation, Inc. and its contributors.
21 * 4. Neither the name of The NetBSD Foundation nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 * Copyright (c) 1996 Charles M. Hannum. All rights reserved.
39 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. All advertising materials mentioning features or use of this software
50 * must display the following acknowledgement:
51 * This product includes software developed by Christopher G. Demetriou
52 * for the NetBSD Project.
53 * 4. The name of the author may not be used to endorse or promote products
54 * derived from this software without specific prior written permission
56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
58 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
59 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
60 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
61 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
62 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
63 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
64 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
65 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
68 * $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $
69 * $FreeBSD: src/sys/i386/include/bus_dma.h,v 1.15.2.2 2002/11/21 23:36:01 sam Exp $
70 * $DragonFly: src/sys/sys/bus_dma.h,v 1.1 2006/10/25 20:56:03 dillon Exp $
73 #ifndef _SYS_BUS_DMA_H_
74 #define _SYS_BUS_DMA_H_
77 * Include machine-specific bus stuff
79 #ifndef _MACHINE_BUS_DMA_H_
80 #include <machine/bus_dma.h> /* bus_addr_t */
84 * Flags used in various bus DMA methods.
86 #define BUS_DMA_WAITOK 0x0000 /* safe to sleep (pseudo-flag) */
87 #define BUS_DMA_NOWAIT 0x0001 /* not safe to sleep */
88 #define BUS_DMA_ALLOCNOW 0x0002 /* perform resource allocation now */
89 #define BUS_DMA_COHERENT 0x0004 /* map memory to not require sync */
90 #define BUS_DMA_ZERO 0x0008 /* allocate zero'ed memory */
91 #define BUS_DMA_BUS1 0x0010 /* placeholders for bus functions... */
92 #define BUS_DMA_BUS2 0x0020
93 #define BUS_DMA_BUS3 0x0040
94 #define BUS_DMA_BUS4 0x0080
95 #define BUS_DMA_ONEBPAGE 0x0100 /* allocate one bpage per map at most */
96 #define BUS_DMA_ALIGNED 0x0200 /* no bpage should be allocated due to
97 * alignment requirement; all to-be-
98 * loaded memory is properly aligned */
100 /* Forwards needed by prototypes below. */
107 * Operations performed by bus_dmamap_sync().
111 BUS_DMASYNC_POSTREAD,
112 BUS_DMASYNC_PREWRITE,
113 BUS_DMASYNC_POSTWRITE
119 * A machine-dependent opaque type describing the characteristics
120 * of how to perform DMA mappings. This structure encapsultes
121 * information concerning address and alignment restrictions, number
122 * of S/G segments, amount of data per S/G segment, etc.
124 typedef struct bus_dma_tag *bus_dma_tag_t;
129 * DMA mapping instance information.
131 typedef struct bus_dmamap *bus_dmamap_t;
136 * Describes a single contiguous DMA transaction. Values
137 * are suitable for programming into DMA registers.
139 typedef struct bus_dma_segment {
140 bus_addr_t ds_addr; /* DMA address */
141 bus_size_t ds_len; /* length of transfer */
144 typedef struct bus_dmamem {
145 bus_dma_tag_t dmem_tag;
146 bus_dmamap_t dmem_map;
148 bus_addr_t dmem_busaddr;
152 * A function that returns 1 if the address cannot be accessed by
153 * a device and 0 if it can be.
155 typedef int bus_dma_filter_t(void *, bus_addr_t);
158 * Allocate a device specific dma_tag encapsulating the constraints of
159 * the parent tag in addition to other restrictions specified:
161 * alignment: alignment for segments.
162 * boundary: Boundary that segments cannot cross.
163 * lowaddr: Low restricted address that cannot appear in a mapping.
164 * highaddr: High restricted address that cannot appear in a mapping.
165 * filtfunc: An optional function to further test if an address
166 * within the range of lowaddr and highaddr cannot appear
168 * filtfuncarg: An argument that will be passed to filtfunc in addition
169 * to the address to test.
170 * maxsize: Maximum mapping size supported by this tag.
171 * nsegments: Number of discontinuities allowed in maps.
172 * maxsegsz: Maximum size of a segment in the map.
173 * flags: Bus DMA flags.
174 * dmat: A pointer to set to a valid dma tag should the return
175 * value of this function indicate success.
177 /* XXX Should probably allow specification of alignment */
178 int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
179 bus_size_t boundary, bus_addr_t lowaddr,
180 bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
181 void *filtfuncarg, bus_size_t maxsize, int nsegments,
182 bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
184 int bus_dma_tag_destroy(bus_dma_tag_t dmat);
187 * Allocate a handle for mapping from kva/uva/physical
188 * address space into bus device space.
190 int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
193 * Destroy a handle for mapping from kva/uva/physical
194 * address space into bus device space.
196 int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
199 * Allocate a piece of memory that can be efficiently mapped into
200 * bus device space based on the constraints lited in the dma tag.
201 * A dmamap to for use with dmamap_load is also allocated.
203 int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
207 * Free a piece of memory and it's allociated dmamap, that was allocated
208 * via bus_dmamem_alloc.
210 void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
213 * A function that processes a successfully loaded dma map or an error
214 * from a delayed load map.
216 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
219 * Map the buffer buf into bus space using the dmamap map.
221 int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
222 bus_size_t buflen, bus_dmamap_callback_t *callback,
223 void *callback_arg, int flags);
226 * Like bus_dmamap_callback but includes map size in bytes. This is
227 * defined as a separate interface to maintain compatiiblity for users
228 * of bus_dmamap_callback_t--at some point these interfaces should be merged.
230 typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
232 * Like bus_dmamap_load but for mbufs. Note the use of the
233 * bus_dmamap_callback2_t interface.
235 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
237 bus_dmamap_callback2_t *callback, void *callback_arg,
240 * Like bus_dmamap_load but for uios. Note the use of the
241 * bus_dmamap_callback2_t interface.
243 int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
245 bus_dmamap_callback2_t *callback, void *callback_arg,
249 * Like bus_dmamap_load_mbuf without callback.
250 * Segmentation information are saved in 'segs' and 'nsegs' if
251 * the loading is successful. 'maxsegs' must be set by caller
252 * and must be at least 1 but less than 'dmat' nsegment. It
253 * indicates the number of elements in 'segs'. 'flags' must
254 * have BUS_DMA_NOWAIT turned on.
257 bus_dmamap_load_mbuf_segment(bus_dma_tag_t dmat, bus_dmamap_t map,
259 bus_dma_segment_t *segs, int maxsegs,
260 int *nsegs, int flags);
263 * Like bus_dmamap_load_mbuf_segment, but it will call m_defrag()
264 * and try reloading if low level code indicates too many fragments
265 * in the '*mbuf'; 'mbuf' will be updated under this situation.
268 bus_dmamap_load_mbuf_defrag(bus_dma_tag_t dmat, bus_dmamap_t map,
270 bus_dma_segment_t *segs, int maxsegs,
271 int *nsegs, int flags);
274 * Convenient function to create coherent busdma memory
277 bus_dmamem_coherent(bus_dma_tag_t parent,
278 bus_size_t alignment, bus_size_t boundary,
279 bus_addr_t lowaddr, bus_addr_t highaddr,
280 bus_size_t maxsize, int flags,
284 * Simplified version of bus_dmamem_coherent() with:
286 * lowaddr == BUS_SPACE_MAXADDR
287 * highaddr == BUS_SPACE_MAXADDR
289 * 'parent' usually should not be NULL, so we could inherit
290 * boundary, lowaddr and highaddr from it.
293 bus_dmamem_coherent_any(bus_dma_tag_t parent, bus_size_t alignment,
294 bus_size_t maxsize, int flags,
295 bus_dma_tag_t *dtag, bus_dmamap_t *dmap,
296 bus_addr_t *busaddr);
299 * Perform a syncronization operation on the given map.
301 void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
302 #define bus_dmamap_sync(dmat, dmamap, op) \
303 if ((dmamap) != NULL) \
304 _bus_dmamap_sync(dmat, dmamap, op)
307 * Release the mapping held by map.
309 void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
310 #define bus_dmamap_unload(dmat, dmamap) \
311 if ((dmamap) != NULL) \
312 _bus_dmamap_unload(dmat, dmamap)
314 #endif /* _SYS_BUS_DMA_H_ */