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      1 /*	$NetBSD: scatterlist.h,v 1.8 2021/12/19 12:13:23 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef	_LINUX_SCATTERLIST_H_
     33 #define	_LINUX_SCATTERLIST_H_
     34 
     35 #include <sys/bus.h>
     36 
     37 #include <asm/io.h>
     38 
     39 #include <linux/mm.h>
     40 #include <linux/mm_types.h>
     41 #include <linux/gfp.h>
     42 #include <linux/types.h>
     43 
     44 /* namespace */
     45 #define	__sg_alloc_table_from_pages	linux___sg_alloc_table_from_pages
     46 #define	dma_map_sg			linux_dma_map_sg
     47 #define	dma_map_sg_attrs		linux_dma_map_sg_attrs
     48 #define	dma_unmap_sg			linux_dma_unmap_sg
     49 #define	dma_unmap_sg_attrs		linux_dma_unmap_sg_attrs
     50 #define	sg_alloc_table			linux_sg_alloc_table
     51 #define	sg_alloc_table_from_bus_dmamem	linux_sg_alloc_table_from_bus_dmamem
     52 #define	sg_alloc_table_from_pages	linux_sg_alloc_table_from_pages
     53 #define	sg_dma_address			linux_sg_dma_address
     54 #define	sg_dma_len			linux_sg_dma_len
     55 #define	sg_free_table			linux_sg_free_table
     56 
     57 struct page;
     58 
     59 struct sg_table {
     60 	struct scatterlist {
     61 		struct page	**sg_pgs;
     62 		unsigned	sg_npgs;
     63 		bus_dma_tag_t	sg_dmat;
     64 		bus_dmamap_t	sg_dmamap;
     65 	} sgl[1];
     66 	unsigned	nents;
     67 };
     68 
     69 int sg_alloc_table(struct sg_table *, unsigned, gfp_t);
     70 int __sg_alloc_table_from_pages(struct sg_table *, struct page **, unsigned,
     71     bus_size_t, bus_size_t, unsigned, gfp_t);
     72 int sg_alloc_table_from_pages(struct sg_table *, struct page **, unsigned,
     73     bus_size_t, bus_size_t, gfp_t);
     74 int sg_alloc_table_from_bus_dmamem(struct sg_table *, bus_dma_tag_t,
     75     const bus_dma_segment_t *, int, gfp_t);
     76 void sg_free_table(struct sg_table *);
     77 
     78 bus_addr_t sg_dma_address(const struct scatterlist *);
     79 bus_size_t sg_dma_len(const struct scatterlist *);
     80 
     81 int dma_map_sg(bus_dma_tag_t, struct scatterlist *, int, int);
     82 int dma_map_sg_attrs(bus_dma_tag_t, struct scatterlist *, int, int, int);
     83 void dma_unmap_sg(bus_dma_tag_t, struct scatterlist *, int, int);
     84 void dma_unmap_sg_attrs(bus_dma_tag_t, struct scatterlist *, int, int, int);
     85 
     86 #endif	/* _LINUX_SCATTERLIST_H_ */
     87