fwdma.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 2003 5 * Hidetoshi Shimokawa. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * 18 * This product includes software developed by Hidetoshi Shimokawa. 19 * 20 * 4. Neither the name of the author nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 */ 37 38#ifdef __FreeBSD__ 39#include <sys/cdefs.h> 40__FBSDID("$FreeBSD: stable/11/sys/dev/firewire/fwdma.c 330897 2018-03-14 03:19:51Z eadler $"); 41#endif 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/types.h> 46#include <sys/kernel.h> 47#include <sys/malloc.h> 48#include <sys/lock.h> 49#include <sys/mutex.h> 50 51#include <sys/bus.h> 52#include <machine/bus.h> 53 54#include <dev/firewire/firewire.h> 55#include <dev/firewire/firewirereg.h> 56#include <dev/firewire/fwdma.h> 57 58static void 59fwdma_map_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error) 60{ 61 bus_addr_t *baddr; 62 63 if (error) 64 printf("fwdma_map_cb: error=%d\n", error); 65 baddr = (bus_addr_t *)arg; 66 *baddr = segs->ds_addr; 67} 68 69void * 70fwdma_malloc(struct firewire_comm *fc, int alignment, bus_size_t size, 71 struct fwdma_alloc *dma, int flag) 72{ 73 int err; 74 75 dma->v_addr = NULL; 76 err = bus_dma_tag_create( 77 /*parent*/ fc->dmat, 78 /*alignment*/ alignment, 79 /*boundary*/ 0, 80 /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT, 81 /*highaddr*/ BUS_SPACE_MAXADDR, 82 /*filter*/NULL, /*filterarg*/NULL, 83 /*maxsize*/ size, 84 /*nsegments*/ 1, 85 /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT, 86 /*flags*/ BUS_DMA_ALLOCNOW, 87 /*lockfunc*/busdma_lock_mutex, 88 /*lockarg*/FW_GMTX(fc), 89 &dma->dma_tag); 90 if (err) { 91 printf("fwdma_malloc: failed(1)\n"); 92 return (NULL); 93 } 94 95 err = bus_dmamem_alloc(dma->dma_tag, &dma->v_addr, 96 flag, &dma->dma_map); 97 if (err) { 98 printf("fwdma_malloc: failed(2)\n"); 99 /* XXX destroy tag */ 100 return (NULL); 101 } 102 103 bus_dmamap_load(dma->dma_tag, dma->dma_map, dma->v_addr, 104 size, fwdma_map_cb, &dma->bus_addr, /*flags*/0); 105 106 return (dma->v_addr); 107} 108 109void 110fwdma_free(struct firewire_comm *fc, struct fwdma_alloc *dma) 111{ 112 bus_dmamap_unload(dma->dma_tag, dma->dma_map); 113 bus_dmamem_free(dma->dma_tag, dma->v_addr, dma->dma_map); 114 bus_dma_tag_destroy(dma->dma_tag); 115} 116 117 118void * 119fwdma_malloc_size(bus_dma_tag_t dmat, bus_dmamap_t *dmamap, 120 bus_size_t size, bus_addr_t *bus_addr, int flag) 121{ 122 void *v_addr; 123 124 if (bus_dmamem_alloc(dmat, &v_addr, flag, dmamap)) { 125 printf("fwdma_malloc_size: failed(1)\n"); 126 return (NULL); 127 } 128 bus_dmamap_load(dmat, *dmamap, v_addr, size, 129 fwdma_map_cb, bus_addr, /*flags*/0); 130 return (v_addr); 131} 132 133void 134fwdma_free_size(bus_dma_tag_t dmat, bus_dmamap_t dmamap, 135 void *vaddr, bus_size_t size) 136{ 137 bus_dmamap_unload(dmat, dmamap); 138 bus_dmamem_free(dmat, vaddr, dmamap); 139} 140 141/* 142 * Allocate multisegment dma buffers 143 * each segment size is eqaul to ssize except last segment. 144 */ 145struct fwdma_alloc_multi * 146fwdma_malloc_multiseg(struct firewire_comm *fc, int alignment, 147 int esize, int n, int flag) 148{ 149 struct fwdma_alloc_multi *am; 150 struct fwdma_seg *seg; 151 bus_size_t ssize; 152 int nseg; 153 154 if (esize > PAGE_SIZE) { 155 /* round up to PAGE_SIZE */ 156 esize = ssize = roundup2(esize, PAGE_SIZE); 157 nseg = n; 158 } else { 159 /* allocate PAGE_SIZE segment for small elements */ 160 ssize = rounddown(PAGE_SIZE, esize); 161 nseg = howmany(n, ssize / esize); 162 } 163 am = (struct fwdma_alloc_multi *)malloc(sizeof(struct fwdma_alloc_multi) 164 + sizeof(struct fwdma_seg)*nseg, M_FW, M_WAITOK); 165 am->ssize = ssize; 166 am->esize = esize; 167 am->nseg = 0; 168 if (bus_dma_tag_create( 169 /*parent*/ fc->dmat, 170 /*alignment*/ alignment, 171 /*boundary*/ 0, 172 /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT, 173 /*highaddr*/ BUS_SPACE_MAXADDR, 174 /*filter*/NULL, /*filterarg*/NULL, 175 /*maxsize*/ ssize, 176 /*nsegments*/ 1, 177 /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT, 178 /*flags*/ BUS_DMA_ALLOCNOW, 179 /*lockfunc*/busdma_lock_mutex, 180 /*lockarg*/FW_GMTX(fc), 181 &am->dma_tag)) { 182 printf("fwdma_malloc_multiseg: tag_create failed\n"); 183 free(am, M_FW); 184 return (NULL); 185 } 186 187 for (seg = &am->seg[0]; nseg--; seg++) { 188 seg->v_addr = fwdma_malloc_size(am->dma_tag, &seg->dma_map, 189 ssize, &seg->bus_addr, flag); 190 if (seg->v_addr == NULL) { 191 printf("fwdma_malloc_multi: malloc_size failed %d\n", 192 am->nseg); 193 fwdma_free_multiseg(am); 194 return (NULL); 195 } 196 am->nseg++; 197 } 198 return (am); 199} 200 201void 202fwdma_free_multiseg(struct fwdma_alloc_multi *am) 203{ 204 struct fwdma_seg *seg; 205 206 for (seg = &am->seg[0]; am->nseg--; seg++) { 207 fwdma_free_size(am->dma_tag, seg->dma_map, 208 seg->v_addr, am->ssize); 209 } 210 bus_dma_tag_destroy(am->dma_tag); 211 free(am, M_FW); 212} 213