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/* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */
/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1996 Charles M. Hannum. All rights reserved.
* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $FreeBSD$ */
#ifndef _I386_BUS_DMA_H_
#define _I386_BUS_DMA_H_
/*
* Flags used in various bus DMA methods.
*/
#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */
#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */
#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */
#define BUS_DMAMEM_NOSYNC 0x04 /* map memory to not require sync */
#define BUS_DMA_BUS1 0x10 /* placeholders for bus functions... */
#define BUS_DMA_BUS2 0x20
#define BUS_DMA_BUS3 0x40
#define BUS_DMA_BUS4 0x80
/* Forwards needed by prototypes below. */
struct mbuf;
struct uio;
/*
* bus_dmasync_op_t
*
* Operations performed by bus_dmamap_sync().
*/
typedef enum {
BUS_DMASYNC_PREREAD,
BUS_DMASYNC_POSTREAD,
BUS_DMASYNC_PREWRITE,
BUS_DMASYNC_POSTWRITE
} bus_dmasync_op_t;
/*
* bus_dma_tag_t
*
* A machine-dependent opaque type describing the characteristics
* of how to perform DMA mappings. This structure encapsultes
* information concerning address and alignment restrictions, number
* of S/G segments, amount of data per S/G segment, etc.
*/
typedef struct bus_dma_tag *bus_dma_tag_t;
/*
* bus_dmamap_t
*
* DMA mapping instance information.
*/
typedef struct bus_dmamap *bus_dmamap_t;
/*
* bus_dma_segment_t
*
* Describes a single contiguous DMA transaction. Values
* are suitable for programming into DMA registers.
*/
typedef struct bus_dma_segment {
bus_addr_t ds_addr; /* DMA address */
bus_size_t ds_len; /* length of transfer */
} bus_dma_segment_t;
/*
* A function that returns 1 if the address cannot be accessed by
* a device and 0 if it can be.
*/
typedef int bus_dma_filter_t(void *, bus_addr_t);
/*
* Allocate a device specific dma_tag encapsulating the constraints of
* the parent tag in addition to other restrictions specified:
*
* alignment: alignment for segments.
* boundary: Boundary that segments cannot cross.
* lowaddr: Low restricted address that cannot appear in a mapping.
* highaddr: High restricted address that cannot appear in a mapping.
* filtfunc: An optional function to further test if an address
* within the range of lowaddr and highaddr cannot appear
* in a mapping.
* filtfuncarg: An argument that will be passed to filtfunc in addition
* to the address to test.
* maxsize: Maximum mapping size supported by this tag.
* nsegments: Number of discontinuities allowed in maps.
* maxsegsz: Maximum size of a segment in the map.
* flags: Bus DMA flags.
* dmat: A pointer to set to a valid dma tag should the return
* value of this function indicate success.
*/
/* XXX Should probably allow specification of alignment */
int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
bus_size_t boundary, bus_addr_t lowaddr,
bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
void *filtfuncarg, bus_size_t maxsize, int nsegments,
bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat);
int bus_dma_tag_destroy(bus_dma_tag_t dmat);
/*
* Allocate a handle for mapping from kva/uva/physical
* address space into bus device space.
*/
int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
/*
* Destroy a handle for mapping from kva/uva/physical
* address space into bus device space.
*/
int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
/*
* Allocate a piece of memory that can be efficiently mapped into
* bus device space based on the constraints lited in the dma tag.
* A dmamap to for use with dmamap_load is also allocated.
*/
int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
bus_dmamap_t *mapp);
/*
* Free a piece of memory and it's allociated dmamap, that was allocated
* via bus_dmamem_alloc.
*/
void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
/*
* A function that processes a successfully loaded dma map or an error
* from a delayed load map.
*/
typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
/*
* Map the buffer buf into bus space using the dmamap map.
*/
int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
bus_size_t buflen, bus_dmamap_callback_t *callback,
void *callback_arg, int flags);
/*
* Like bus_dmamap_callback but includes map size in bytes. This is
* defined as a separate interface to maintain compatiiblity for users
* of bus_dmamap_callback_t--at some point these interfaces should be merged.
*/
typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
/*
* Like bus_dmamap_load but for mbufs. Note the use of the
* bus_dmamap_callback2_t interface.
*/
int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *mbuf,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
/*
* Like bus_dmamap_load but for uios. Note the use of the
* bus_dmamap_callback2_t interface.
*/
int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
struct uio *ui,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags);
/*
* Perform a syncronization operation on the given map.
*/
void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
#define bus_dmamap_sync(dmat, dmamap, op) \
if ((dmamap) != NULL) \
_bus_dmamap_sync(dmat, dmamap, op)
/*
* Release the mapping held by map.
*/
void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
#define bus_dmamap_unload(dmat, dmamap) \
if ((dmamap) != NULL) \
_bus_dmamap_unload(dmat, dmamap)
#endif /* _I386_BUS_DMA_H_ */
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