sys/sys/bus_dma.h

   1 /*-
   2  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   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.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  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.
  24  *
  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.
  36  */
  37 /*
  38  * Copyright (c) 1996 Charles M. Hannum.  All rights reserved.
  39  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  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
  55  *
  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.
  66  */
  67 /*
  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 $
  71  */
  72
  73 #ifndef _SYS_BUS_DMA_H_
  74 #define _SYS_BUS_DMA_H_
  75
  76 /*
  77  * Include machine-specific bus stuff
  78  */
  79 #ifndef _MACHINE_BUS_DMA_H_
  80 #include <machine/bus_dma.h>    /* bus_addr_t */
  81 #endif
  82
  83 /*
  84  * Flags used in various bus DMA methods.
  85  */
  86 #define BUS_DMA_WAITOK          0x00    /* safe to sleep (pseudo-flag) */
  87 #define BUS_DMA_NOWAIT          0x01    /* not safe to sleep */
  88 #define BUS_DMA_ALLOCNOW        0x02    /* perform resource allocation now */
  89 #define BUS_DMA_COHERENT        0x04    /* map memory to not require sync */
  90 #define BUS_DMA_ZERO            0x08    /* allocate zero'ed memory */
  91 #define BUS_DMA_BUS1            0x10    /* placeholders for bus functions... */
  92 #define BUS_DMA_BUS2            0x20
  93 #define BUS_DMA_BUS3            0x40
  94 #define BUS_DMA_BUS4            0x80
  95
  96 /* Forwards needed by prototypes below. */
  97 struct mbuf;
  98 struct uio;
  99
 100 /*
 101  *      bus_dmasync_op_t
 102  *
 103  *      Operations performed by bus_dmamap_sync().
 104  */
 105 typedef enum {
 106         BUS_DMASYNC_PREREAD,
 107         BUS_DMASYNC_POSTREAD,
 108         BUS_DMASYNC_PREWRITE,
 109         BUS_DMASYNC_POSTWRITE
 110 } bus_dmasync_op_t;
 111
 112 /*
 113  *      bus_dma_tag_t
 114  *
 115  *      A machine-dependent opaque type describing the characteristics
 116  *      of how to perform DMA mappings.  This structure encapsultes
 117  *      information concerning address and alignment restrictions, number
 118  *      of S/G  segments, amount of data per S/G segment, etc.
 119  */
 120 typedef struct bus_dma_tag      *bus_dma_tag_t;
 121
 122 /*
 123  *      bus_dmamap_t
 124  *
 125  *      DMA mapping instance information.
 126  */
 127 typedef struct bus_dmamap       *bus_dmamap_t;
 128
 129 /*
 130  *      bus_dma_segment_t
 131  *
 132  *      Describes a single contiguous DMA transaction.  Values
 133  *      are suitable for programming into DMA registers.
 134  */
 135 typedef struct bus_dma_segment {
 136         bus_addr_t      ds_addr;        /* DMA address */
 137         bus_size_t      ds_len;         /* length of transfer */
 138 } bus_dma_segment_t;
 139
 140 /*
 141  * A function that returns 1 if the address cannot be accessed by
 142  * a device and 0 if it can be.
 143  */
 144 typedef int bus_dma_filter_t(void *, bus_addr_t);
 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  *      dmat:           A pointer to set to a valid dma tag should the return
 164  *                      value of this function indicate success.
 165  */
 166 /* XXX Should probably allow specification of alignment */
 167 int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
 168                        bus_size_t boundary, bus_addr_t lowaddr,
 169                        bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
 170                        void *filtfuncarg, bus_size_t maxsize, int nsegments,
 171                        bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
 172
 173 int bus_dma_tag_destroy(bus_dma_tag_t dmat);
 174
 175 /*
 176  * Allocate a handle for mapping from kva/uva/physical
 177  * address space into bus device space.
 178  */
 179 int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
 180
 181 /*
 182  * Destroy  a handle for mapping from kva/uva/physical
 183  * address space into bus device space.
 184  */
 185 int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
 186
 187 /*
 188  * Allocate a piece of memory that can be efficiently mapped into
 189  * bus device space based on the constraints lited in the dma tag.
 190  * A dmamap to for use with dmamap_load is also allocated.
 191  */
 192 int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
 193                      bus_dmamap_t *mapp);
 194
 195 /*
 196  * Free a piece of memory and it's allociated dmamap, that was allocated
 197  * via bus_dmamem_alloc.
 198  */
 199 void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
 200
 201 /*
 202  * A function that processes a successfully loaded dma map or an error
 203  * from a delayed load map.
 204  */
 205 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
 206
 207 /*
 208  * Map the buffer buf into bus space using the dmamap map.
 209  */
 210 int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
 211                     bus_size_t buflen, bus_dmamap_callback_t *callback,
 212                     void *callback_arg, int flags);
 213
 214 /*
 215  * Like bus_dmamap_callback but includes map size in bytes.  This is
 216  * defined as a separate interface to maintain compatiiblity for users
 217  * of bus_dmamap_callback_t--at some point these interfaces should be merged.
 218  */
 219 typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
 220 /*
 221  * Like bus_dmamap_load but for mbufs.  Note the use of the
 222  * bus_dmamap_callback2_t interface.
 223  */
 224 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
 225                          struct mbuf *mbuf,
 226                          bus_dmamap_callback2_t *callback, void *callback_arg,
 227                          int flags);
 228 /*
 229  * Like bus_dmamap_load but for uios.  Note the use of the
 230  * bus_dmamap_callback2_t interface.
 231  */
 232 int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
 233                         struct uio *ui,
 234                         bus_dmamap_callback2_t *callback, void *callback_arg,
 235                         int flags);
 236
 237 /*
 238  * Perform a syncronization operation on the given map.
 239  */
 240 void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
 241 #define bus_dmamap_sync(dmat, dmamap, op)               \
 242         if ((dmamap) != NULL)                           \
 243                 _bus_dmamap_sync(dmat, dmamap, op)
 244
 245 /*
 246  * Release the mapping held by map.
 247  */
 248 void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
 249 #define bus_dmamap_unload(dmat, dmamap)                 \
 250         if ((dmamap) != NULL)                           \
 251                 _bus_dmamap_unload(dmat, dmamap)
 252
 253 #endif /* _SYS_BUS_DMA_H_ */
 254