The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/bus_dma.h

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    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: releng/5.0/sys/i386/include/bus_dma.h 104486 2002-10-04 20:40:39Z sam $ */
   71 
   72 #ifndef _I386_BUS_DMA_H_
   73 #define _I386_BUS_DMA_H_
   74 
   75 /*
   76  * Flags used in various bus DMA methods.
   77  */
   78 #define BUS_DMA_WAITOK          0x00    /* safe to sleep (pseudo-flag) */
   79 #define BUS_DMA_NOWAIT          0x01    /* not safe to sleep */
   80 #define BUS_DMA_ALLOCNOW        0x02    /* perform resource allocation now */
   81 #define BUS_DMAMEM_NOSYNC       0x04    /* map memory to not require sync */
   82 #define BUS_DMA_BUS1            0x10    /* placeholders for bus functions... */
   83 #define BUS_DMA_BUS2            0x20
   84 #define BUS_DMA_BUS3            0x40
   85 #define BUS_DMA_BUS4            0x80
   86 
   87 /* Forwards needed by prototypes below. */
   88 struct mbuf;
   89 struct uio;
   90 
   91 /*
   92  *      bus_dmasync_op_t
   93  *
   94  *      Operations performed by bus_dmamap_sync().
   95  */
   96 typedef enum {
   97         BUS_DMASYNC_PREREAD,
   98         BUS_DMASYNC_POSTREAD,
   99         BUS_DMASYNC_PREWRITE,
  100         BUS_DMASYNC_POSTWRITE
  101 } bus_dmasync_op_t;
  102 
  103 /*
  104  *      bus_dma_tag_t
  105  *
  106  *      A machine-dependent opaque type describing the characteristics
  107  *      of how to perform DMA mappings.  This structure encapsultes
  108  *      information concerning address and alignment restrictions, number
  109  *      of S/G  segments, amount of data per S/G segment, etc.
  110  */
  111 typedef struct bus_dma_tag      *bus_dma_tag_t;
  112 
  113 /*
  114  *      bus_dmamap_t
  115  *
  116  *      DMA mapping instance information.
  117  */
  118 typedef struct bus_dmamap       *bus_dmamap_t;
  119 
  120 /*
  121  *      bus_dma_segment_t
  122  *
  123  *      Describes a single contiguous DMA transaction.  Values
  124  *      are suitable for programming into DMA registers.
  125  */
  126 typedef struct bus_dma_segment {
  127         bus_addr_t      ds_addr;        /* DMA address */
  128         bus_size_t      ds_len;         /* length of transfer */
  129 } bus_dma_segment_t;
  130 
  131 /*
  132  * A function that returns 1 if the address cannot be accessed by
  133  * a device and 0 if it can be.
  134  */
  135 typedef int bus_dma_filter_t(void *, bus_addr_t);
  136 
  137 /*
  138  * Allocate a device specific dma_tag encapsulating the constraints of
  139  * the parent tag in addition to other restrictions specified:
  140  *
  141  *      alignment:      alignment for segments.
  142  *      boundary:       Boundary that segments cannot cross.
  143  *      lowaddr:        Low restricted address that cannot appear in a mapping.
  144  *      highaddr:       High restricted address that cannot appear in a mapping.
  145  *      filtfunc:       An optional function to further test if an address
  146  *                      within the range of lowaddr and highaddr cannot appear
  147  *                      in a mapping.
  148  *      filtfuncarg:    An argument that will be passed to filtfunc in addition
  149  *                      to the address to test.
  150  *      maxsize:        Maximum mapping size supported by this tag.
  151  *      nsegments:      Number of discontinuities allowed in maps.
  152  *      maxsegsz:       Maximum size of a segment in the map.
  153  *      flags:          Bus DMA flags.
  154  *      dmat:           A pointer to set to a valid dma tag should the return
  155  *                      value of this function indicate success.
  156  */
  157 /* XXX Should probably allow specification of alignment */
  158 int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
  159                        bus_size_t boundary, bus_addr_t lowaddr,
  160                        bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
  161                        void *filtfuncarg, bus_size_t maxsize, int nsegments,
  162                        bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
  163 
  164 int bus_dma_tag_destroy(bus_dma_tag_t dmat);
  165 
  166 /*
  167  * Allocate a handle for mapping from kva/uva/physical
  168  * address space into bus device space.
  169  */
  170 int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
  171 
  172 /*
  173  * Destroy  a handle for mapping from kva/uva/physical
  174  * address space into bus device space.
  175  */
  176 int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
  177 
  178 /*
  179  * Allocate a piece of memory that can be efficiently mapped into
  180  * bus device space based on the constraints lited in the dma tag.
  181  * A dmamap to for use with dmamap_load is also allocated.
  182  */
  183 int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
  184                      bus_dmamap_t *mapp);
  185 
  186 /*
  187  * Free a piece of memory and it's allociated dmamap, that was allocated
  188  * via bus_dmamem_alloc.
  189  */
  190 void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
  191 
  192 /*
  193  * A function that processes a successfully loaded dma map or an error
  194  * from a delayed load map.
  195  */
  196 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
  197 
  198 /*
  199  * Map the buffer buf into bus space using the dmamap map.
  200  */
  201 int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
  202                     bus_size_t buflen, bus_dmamap_callback_t *callback,
  203                     void *callback_arg, int flags);
  204 
  205 /*
  206  * Like bus_dmamap_callback but includes map size in bytes.  This is
  207  * defined as a separate interface to maintain compatiiblity for users
  208  * of bus_dmamap_callback_t--at some point these interfaces should be merged.
  209  */
  210 typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
  211 /*
  212  * Like bus_dmamap_load but for mbufs.  Note the use of the
  213  * bus_dmamap_callback2_t interface.
  214  */
  215 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
  216                          struct mbuf *mbuf,
  217                          bus_dmamap_callback2_t *callback, void *callback_arg,
  218                          int flags);
  219 /*
  220  * Like bus_dmamap_load but for uios.  Note the use of the
  221  * bus_dmamap_callback2_t interface.
  222  */
  223 int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
  224                         struct uio *ui,
  225                         bus_dmamap_callback2_t *callback, void *callback_arg,
  226                         int flags);
  227 
  228 /*
  229  * Perform a syncronization operation on the given map.
  230  */
  231 void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
  232 #define bus_dmamap_sync(dmat, dmamap, op)               \
  233         if ((dmamap) != NULL)                           \
  234                 _bus_dmamap_sync(dmat, dmamap, op)
  235 
  236 /*
  237  * Release the mapping held by map.
  238  */
  239 void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
  240 #define bus_dmamap_unload(dmat, dmamap)                 \
  241         if ((dmamap) != NULL)                           \
  242                 _bus_dmamap_unload(dmat, dmamap)
  243 
  244 #endif /* _I386_BUS_DMA_H_ */

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