bus_dma.h revision 139790
132517Sgibbs/* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */ 232517Sgibbs 332517Sgibbs/*- 432517Sgibbs * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 532517Sgibbs * All rights reserved. 632517Sgibbs * 732517Sgibbs * This code is derived from software contributed to The NetBSD Foundation 832517Sgibbs * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 932517Sgibbs * NASA Ames Research Center. 1032517Sgibbs * 1132517Sgibbs * Redistribution and use in source and binary forms, with or without 1232517Sgibbs * modification, are permitted provided that the following conditions 1332517Sgibbs * are met: 1432517Sgibbs * 1. Redistributions of source code must retain the above copyright 1532517Sgibbs * notice, this list of conditions and the following disclaimer. 1632517Sgibbs * 2. Redistributions in binary form must reproduce the above copyright 1732517Sgibbs * notice, this list of conditions and the following disclaimer in the 1832517Sgibbs * documentation and/or other materials provided with the distribution. 1932517Sgibbs * 3. All advertising materials mentioning features or use of this software 2032517Sgibbs * must display the following acknowledgement: 2132517Sgibbs * This product includes software developed by the NetBSD 2232517Sgibbs * Foundation, Inc. and its contributors. 2332517Sgibbs * 4. Neither the name of The NetBSD Foundation nor the names of its 2432517Sgibbs * contributors may be used to endorse or promote products derived 2532517Sgibbs * from this software without specific prior written permission. 2632517Sgibbs * 2732517Sgibbs * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 2832517Sgibbs * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 2932517Sgibbs * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 3032517Sgibbs * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 3132517Sgibbs * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 3232517Sgibbs * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 3332517Sgibbs * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 3432517Sgibbs * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 3532517Sgibbs * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 3632517Sgibbs * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 3732517Sgibbs * POSSIBILITY OF SUCH DAMAGE. 3832517Sgibbs */ 3932517Sgibbs 40139790Simp/*- 4132517Sgibbs * Copyright (c) 1996 Charles M. Hannum. All rights reserved. 4232517Sgibbs * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 4332517Sgibbs * 4432517Sgibbs * Redistribution and use in source and binary forms, with or without 4532517Sgibbs * modification, are permitted provided that the following conditions 4632517Sgibbs * are met: 4732517Sgibbs * 1. Redistributions of source code must retain the above copyright 4832517Sgibbs * notice, this list of conditions and the following disclaimer. 4932517Sgibbs * 2. Redistributions in binary form must reproduce the above copyright 5032517Sgibbs * notice, this list of conditions and the following disclaimer in the 5132517Sgibbs * documentation and/or other materials provided with the distribution. 5232517Sgibbs * 3. All advertising materials mentioning features or use of this software 5332517Sgibbs * must display the following acknowledgement: 5432517Sgibbs * This product includes software developed by Christopher G. Demetriou 5532517Sgibbs * for the NetBSD Project. 5632517Sgibbs * 4. The name of the author may not be used to endorse or promote products 5732517Sgibbs * derived from this software without specific prior written permission 5832517Sgibbs * 5932517Sgibbs * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 6032517Sgibbs * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 6132517Sgibbs * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 6232517Sgibbs * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 6332517Sgibbs * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 6432517Sgibbs * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 6532517Sgibbs * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 6632517Sgibbs * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 6732517Sgibbs * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 6832517Sgibbs * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 6932517Sgibbs */ 7050477Speter/* $FreeBSD: head/sys/sys/bus_dma.h 139790 2005-01-06 22:18:23Z imp $ */ 7132517Sgibbs 7284593Snyan#ifndef _I386_BUS_DMA_H_ 7384593Snyan#define _I386_BUS_DMA_H_ 7432517Sgibbs 7532517Sgibbs/* 7632517Sgibbs * Flags used in various bus DMA methods. 7732517Sgibbs */ 7832517Sgibbs#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */ 7932517Sgibbs#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */ 8032517Sgibbs#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */ 81115416Shmp#define BUS_DMA_COHERENT 0x04 /* hint: map memory in a coherent way */ 82118081Smux#define BUS_DMA_ZERO 0x08 /* allocate zero'ed memory */ 8332517Sgibbs#define BUS_DMA_BUS1 0x10 /* placeholders for bus functions... */ 8432517Sgibbs#define BUS_DMA_BUS2 0x20 8532517Sgibbs#define BUS_DMA_BUS3 0x40 8632517Sgibbs#define BUS_DMA_BUS4 0x80 8732517Sgibbs 8832517Sgibbs/* Forwards needed by prototypes below. */ 8932517Sgibbsstruct mbuf; 9032517Sgibbsstruct uio; 9132517Sgibbs 9232517Sgibbs/* 93113347Smux * Operations performed by bus_dmamap_sync(). 9432517Sgibbs */ 95115343Sscottltypedef int bus_dmasync_op_t; 96113347Smux#define BUS_DMASYNC_PREREAD 1 97113347Smux#define BUS_DMASYNC_POSTREAD 2 98113347Smux#define BUS_DMASYNC_PREWRITE 4 99113347Smux#define BUS_DMASYNC_POSTWRITE 8 10032517Sgibbs 10132517Sgibbs/* 10232517Sgibbs * bus_dma_tag_t 10332517Sgibbs * 10432517Sgibbs * A machine-dependent opaque type describing the characteristics 10532517Sgibbs * of how to perform DMA mappings. This structure encapsultes 10632517Sgibbs * information concerning address and alignment restrictions, number 107122154Sanholt * of S/G segments, amount of data per S/G segment, etc. 10832517Sgibbs */ 10932517Sgibbstypedef struct bus_dma_tag *bus_dma_tag_t; 11032517Sgibbs 11132517Sgibbs/* 11232517Sgibbs * bus_dmamap_t 11332517Sgibbs * 11432517Sgibbs * DMA mapping instance information. 11532517Sgibbs */ 11632517Sgibbstypedef struct bus_dmamap *bus_dmamap_t; 11732517Sgibbs 11832517Sgibbs/* 11932517Sgibbs * bus_dma_segment_t 12032517Sgibbs * 12132517Sgibbs * Describes a single contiguous DMA transaction. Values 12232517Sgibbs * are suitable for programming into DMA registers. 12332517Sgibbs */ 12432517Sgibbstypedef struct bus_dma_segment { 12532517Sgibbs bus_addr_t ds_addr; /* DMA address */ 12632517Sgibbs bus_size_t ds_len; /* length of transfer */ 12732517Sgibbs} bus_dma_segment_t; 12832517Sgibbs 12932517Sgibbs/* 13032517Sgibbs * A function that returns 1 if the address cannot be accessed by 13132517Sgibbs * a device and 0 if it can be. 13232517Sgibbs */ 13332517Sgibbstypedef int bus_dma_filter_t(void *, bus_addr_t); 13432517Sgibbs 13532517Sgibbs/* 136122154Sanholt * A function that performs driver-specific synchronization on behalf of 137117126Sscottl * busdma. 138117126Sscottl */ 139117126Sscottltypedef enum { 140117126Sscottl BUS_DMA_LOCK = 0x01, 141117126Sscottl BUS_DMA_UNLOCK = 0x02, 142117126Sscottl} bus_dma_lock_op_t; 143117126Sscottl 144117126Sscottltypedef void bus_dma_lock_t(void *, bus_dma_lock_op_t); 145117126Sscottl 146117126Sscottl/* 14732517Sgibbs * Allocate a device specific dma_tag encapsulating the constraints of 14832517Sgibbs * the parent tag in addition to other restrictions specified: 14932517Sgibbs * 150122154Sanholt * alignment: Alignment for segments. 15132517Sgibbs * boundary: Boundary that segments cannot cross. 15232517Sgibbs * lowaddr: Low restricted address that cannot appear in a mapping. 15332517Sgibbs * highaddr: High restricted address that cannot appear in a mapping. 15432517Sgibbs * filtfunc: An optional function to further test if an address 15532517Sgibbs * within the range of lowaddr and highaddr cannot appear 15632517Sgibbs * in a mapping. 15732517Sgibbs * filtfuncarg: An argument that will be passed to filtfunc in addition 15832517Sgibbs * to the address to test. 15935767Sgibbs * maxsize: Maximum mapping size supported by this tag. 16035767Sgibbs * nsegments: Number of discontinuities allowed in maps. 16135767Sgibbs * maxsegsz: Maximum size of a segment in the map. 16232517Sgibbs * flags: Bus DMA flags. 163122266Sscottl * lockfunc: An optional function to handle driver-defined lock 164122266Sscottl * operations. 165122266Sscottl * lockfuncarg: An argument that will be passed to lockfunc in addition 166122266Sscottl * to the lock operation. 16732517Sgibbs * dmat: A pointer to set to a valid dma tag should the return 16832517Sgibbs * value of this function indicate success. 16932517Sgibbs */ 17035767Sgibbs/* XXX Should probably allow specification of alignment */ 17178353Salexint bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 17235767Sgibbs bus_size_t boundary, bus_addr_t lowaddr, 17335767Sgibbs bus_addr_t highaddr, bus_dma_filter_t *filtfunc, 17435767Sgibbs void *filtfuncarg, bus_size_t maxsize, int nsegments, 175117126Sscottl bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 176117126Sscottl void *lockfuncarg, bus_dma_tag_t *dmat); 17732517Sgibbs 17832517Sgibbsint bus_dma_tag_destroy(bus_dma_tag_t dmat); 17932517Sgibbs 18032517Sgibbs/* 18132517Sgibbs * Allocate a handle for mapping from kva/uva/physical 18232517Sgibbs * address space into bus device space. 18332517Sgibbs */ 18432517Sgibbsint bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp); 18532517Sgibbs 18632517Sgibbs/* 187122154Sanholt * Destroy a handle for mapping from kva/uva/physical 18832517Sgibbs * address space into bus device space. 18932517Sgibbs */ 19032517Sgibbsint bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map); 19132517Sgibbs 19232517Sgibbs/* 19335767Sgibbs * Allocate a piece of memory that can be efficiently mapped into 194122154Sanholt * bus device space based on the constraints listed in the dma tag. 19535767Sgibbs * A dmamap to for use with dmamap_load is also allocated. 19635767Sgibbs */ 19735767Sgibbsint bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 19835767Sgibbs bus_dmamap_t *mapp); 19935767Sgibbs 20035767Sgibbs/* 201122154Sanholt * Free a piece of memory and its allocated dmamap, that was allocated 20235767Sgibbs * via bus_dmamem_alloc. 20335767Sgibbs */ 20435767Sgibbsvoid bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map); 20535767Sgibbs 20635767Sgibbs/* 20732517Sgibbs * A function that processes a successfully loaded dma map or an error 20832517Sgibbs * from a delayed load map. 20932517Sgibbs */ 21032517Sgibbstypedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int); 21132517Sgibbs 21232517Sgibbs/* 21332517Sgibbs * Map the buffer buf into bus space using the dmamap map. 21432517Sgibbs */ 21532517Sgibbsint bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 21632517Sgibbs bus_size_t buflen, bus_dmamap_callback_t *callback, 21732517Sgibbs void *callback_arg, int flags); 21832517Sgibbs 21932517Sgibbs/* 220104486Ssam * Like bus_dmamap_callback but includes map size in bytes. This is 221122154Sanholt * defined as a separate interface to maintain compatibility for users 222104486Ssam * of bus_dmamap_callback_t--at some point these interfaces should be merged. 223104486Ssam */ 224104486Ssamtypedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int); 225104486Ssam/* 226104486Ssam * Like bus_dmamap_load but for mbufs. Note the use of the 227104486Ssam * bus_dmamap_callback2_t interface. 228104486Ssam */ 229104486Ssamint bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, 230104486Ssam struct mbuf *mbuf, 231104486Ssam bus_dmamap_callback2_t *callback, void *callback_arg, 232104486Ssam int flags); 233104486Ssam/* 234104486Ssam * Like bus_dmamap_load but for uios. Note the use of the 235104486Ssam * bus_dmamap_callback2_t interface. 236104486Ssam */ 237104486Ssamint bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, 238104486Ssam struct uio *ui, 239104486Ssam bus_dmamap_callback2_t *callback, void *callback_arg, 240104486Ssam int flags); 241104486Ssam 242104486Ssam/* 243122154Sanholt * Perform a synchronization operation on the given map. 24432517Sgibbs */ 245115343Sscottlvoid _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t); 24632517Sgibbs#define bus_dmamap_sync(dmat, dmamap, op) \ 24732517Sgibbs if ((dmamap) != NULL) \ 24832517Sgibbs _bus_dmamap_sync(dmat, dmamap, op) 24932517Sgibbs 25032517Sgibbs/* 25132517Sgibbs * Release the mapping held by map. 25232517Sgibbs */ 25332517Sgibbsvoid _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map); 25432517Sgibbs#define bus_dmamap_unload(dmat, dmamap) \ 25532517Sgibbs if ((dmamap) != NULL) \ 25632517Sgibbs _bus_dmamap_unload(dmat, dmamap) 25732517Sgibbs 258117126Sscottl/* 259117126Sscottl * Generic helper function for manipulating mutexes. 260117126Sscottl */ 261117126Sscottlvoid busdma_lock_mutex(void *arg, bus_dma_lock_op_t op); 26284593Snyan#endif /* _I386_BUS_DMA_H_ */ 263