fwdma.c revision 117732
1/* 2 * Copyright (c) 2003 3 * Hidetoshi Shimokawa. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * 16 * This product includes software developed by Hidetoshi Shimokawa. 17 * 18 * 4. Neither the name of the author nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $FreeBSD: head/sys/dev/firewire/fwdma.c 117732 2003-07-18 14:31:16Z simokawa $ 35 */ 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/types.h> 39#include <sys/kernel.h> 40#include <sys/malloc.h> 41#if __FreeBSD_version >= 501102 42#include <sys/lock.h> 43#include <sys/mutex.h> 44#endif 45 46#include <sys/bus.h> 47#include <machine/bus.h> 48 49#include <dev/firewire/firewire.h> 50#include <dev/firewire/firewirereg.h> 51#include <dev/firewire/fwdma.h> 52 53static void 54fwdma_map_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error) 55{ 56 bus_addr_t *baddr; 57 58 if (error) 59 printf("fwdma_map_cb: error=%d\n", error); 60 baddr = (bus_addr_t *)arg; 61 *baddr = segs->ds_addr; 62} 63 64void * 65fwdma_malloc(struct firewire_comm *fc, int alignment, bus_size_t size, 66 struct fwdma_alloc *dma, int flag) 67{ 68 int err; 69 70 dma->v_addr = NULL; 71 err = bus_dma_tag_create( 72 /*parent*/ fc->dmat, 73 /*alignment*/ alignment, 74 /*boundary*/ 0, 75 /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT, 76 /*highaddr*/ BUS_SPACE_MAXADDR, 77 /*filter*/NULL, /*filterarg*/NULL, 78 /*maxsize*/ size, 79 /*nsegments*/ 1, 80 /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT, 81 /*flags*/ BUS_DMA_ALLOCNOW, 82#if __FreeBSD_version >= 501102 83 /*lockfunc*/busdma_lock_mutex, 84 /*lockarg*/&Giant, 85#endif 86 &dma->dma_tag); 87 if (err) { 88 printf("fwdma_malloc: failed(1)\n"); 89 return(NULL); 90 } 91 92 err = bus_dmamem_alloc(dma->dma_tag, &dma->v_addr, 93 flag, &dma->dma_map); 94 if (err) { 95 printf("fwdma_malloc: failed(2)\n"); 96 /* XXX destory tag */ 97 return(NULL); 98 } 99 100 bus_dmamap_load(dma->dma_tag, dma->dma_map, dma->v_addr, 101 size, fwdma_map_cb, &dma->bus_addr, /*flags*/0); 102 103 return(dma->v_addr); 104} 105 106void 107fwdma_free(struct firewire_comm *fc, struct fwdma_alloc *dma) 108{ 109 bus_dmamap_unload(dma->dma_tag, dma->dma_map); 110 bus_dmamem_free(dma->dma_tag, dma->v_addr, dma->dma_map); 111 bus_dma_tag_destroy(dma->dma_tag); 112} 113 114 115void * 116fwdma_malloc_size(bus_dma_tag_t dmat, bus_dmamap_t *dmamap, 117 bus_size_t size, bus_addr_t *bus_addr, int flag) 118{ 119 void *v_addr; 120 121 if (bus_dmamem_alloc(dmat, &v_addr, flag, dmamap)) { 122 printf("fwdma_malloc_size: failed(1)\n"); 123 return(NULL); 124 } 125 bus_dmamap_load(dmat, *dmamap, v_addr, size, 126 fwdma_map_cb, bus_addr, /*flags*/0); 127 return(v_addr); 128} 129 130void 131fwdma_free_size(bus_dma_tag_t dmat, bus_dmamap_t dmamap, 132 void *vaddr, bus_size_t size) 133{ 134 bus_dmamap_unload(dmat, dmamap); 135 bus_dmamem_free(dmat, vaddr, dmamap); 136} 137 138/* 139 * Allocate multisegment dma buffers 140 * each segment size is eqaul to ssize except last segment. 141 */ 142struct fwdma_alloc_multi * 143fwdma_malloc_multiseg(struct firewire_comm *fc, int alignment, 144 int esize, int n, int flag) 145{ 146 struct fwdma_alloc_multi *am; 147 struct fwdma_seg *seg; 148 bus_size_t ssize; 149 int nseg; 150 151 if (esize > PAGE_SIZE) { 152 /* round up to PAGE_SIZE */ 153 esize = ssize = roundup2(esize, PAGE_SIZE); 154 nseg = n; 155 } else { 156 /* allocate PAGE_SIZE segment for small elements */ 157 ssize = rounddown(PAGE_SIZE, esize); 158 nseg = howmany(n, ssize / esize); 159 } 160 am = (struct fwdma_alloc_multi *)malloc(sizeof(struct fwdma_alloc_multi) 161 + sizeof(struct fwdma_seg)*nseg, M_FW, M_WAITOK); 162 if (am == NULL) { 163 printf("fwdma_malloc_multiseg: malloc failed\n"); 164 return(NULL); 165 } 166 am->ssize = ssize; 167 am->esize = esize; 168 am->nseg = 0; 169 if (bus_dma_tag_create( 170 /*parent*/ fc->dmat, 171 /*alignment*/ alignment, 172 /*boundary*/ 0, 173 /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT, 174 /*highaddr*/ BUS_SPACE_MAXADDR, 175 /*filter*/NULL, /*filterarg*/NULL, 176 /*maxsize*/ ssize, 177 /*nsegments*/ 1, 178 /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT, 179 /*flags*/ BUS_DMA_ALLOCNOW, 180#if __FreeBSD_version >= 501102 181 /*lockfunc*/busdma_lock_mutex, 182 /*lockarg*/&Giant, 183#endif 184 &am->dma_tag)) { 185 printf("fwdma_malloc_multiseg: tag_create failed\n"); 186 free(am, M_FW); 187 return(NULL); 188 } 189 190#if 0 191#if __FreeBSD_version < 500000 192 printf("malloc_multi: ssize=%d nseg=%d\n", ssize, nseg); 193#else 194 printf("malloc_multi: ssize=%td nseg=%d\n", ssize, nseg); 195#endif 196#endif 197 for (seg = &am->seg[0]; nseg --; seg ++) { 198 seg->v_addr = fwdma_malloc_size(am->dma_tag, &seg->dma_map, 199 ssize, &seg->bus_addr, flag); 200 if (seg->v_addr == NULL) { 201 printf("fwdma_malloc_multi: malloc_size failed %d\n", 202 am->nseg); 203 fwdma_free_multiseg(am); 204 return(NULL); 205 } 206 am->nseg++; 207 } 208 return(am); 209} 210 211void 212fwdma_free_multiseg(struct fwdma_alloc_multi *am) 213{ 214 struct fwdma_seg *seg; 215 216 for (seg = &am->seg[0]; am->nseg --; seg ++) { 217 fwdma_free_size(am->dma_tag, seg->dma_map, 218 seg->v_addr, am->ssize); 219 } 220 bus_dma_tag_destroy(am->dma_tag); 221 free(am, M_FW); 222} 223