sys/bus/firewire/fwdma.c

   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: src/sys/dev/firewire/fwdma.c,v 1.5 2003/08/24 17:46:07 obrien Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/conf.h>
  40 #include <sys/bus.h>
  41 #include <sys/types.h>
  42 #include <sys/kernel.h>
  43 #include <sys/malloc.h>
  44 #if defined(__FreeBSD__) && __FreeBSD_version >= 501102
  45 #include <sys/lock.h>
  46 #include <sys/mutex.h>
  47 #endif
  48
  49 #ifdef __DragonFly__
  50 #include <bus/firewire/firewire.h>
  51 #include <bus/firewire/firewirereg.h>
  52 #include <bus/firewire/fwdma.h>
  53 #else
  54 #include <dev/firewire/firewire.h>
  55 #include <dev/firewire/firewirereg.h>
  56 #include <dev/firewire/fwdma.h>
  57 #endif
  58
  59 static void
  60 fwdma_map_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  61 {
  62         bus_addr_t *baddr;
  63
  64         if (error)
  65                 kprintf("fwdma_map_cb: error=%d\n", error);
  66         baddr = (bus_addr_t *)arg;
  67         *baddr = segs->ds_addr;
  68 }
  69
  70 void *
  71 fwdma_malloc(struct firewire_comm *fc, int alignment, bus_size_t size,
  72         struct fwdma_alloc *dma, int flag)
  73 {
  74         int err;
  75
  76         dma->v_addr = NULL;
  77         err = bus_dma_tag_create(
  78                 /*parent*/ fc->dmat,
  79                 /*alignment*/ alignment,
  80                 /*boundary*/ 0,
  81                 /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT,
  82                 /*highaddr*/ BUS_SPACE_MAXADDR,
  83                 /*filter*/NULL, /*filterarg*/NULL,
  84                 /*maxsize*/ size,
  85                 /*nsegments*/ 1,
  86                 /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT,
  87                 /*flags*/ BUS_DMA_ALLOCNOW,
  88 #if defined(__FreeBSD__) && __FreeBSD_version >= 501102
  89                 /*lockfunc*/busdma_lock_mutex,
  90                 /*lockarg*/&Giant,
  91 #endif
  92                 &dma->dma_tag);
  93         if (err) {
  94                 kprintf("fwdma_malloc: failed(1)\n");
  95                 return(NULL);
  96         }
  97
  98         err = bus_dmamem_alloc(dma->dma_tag, &dma->v_addr,
  99                 flag, &dma->dma_map);
 100         if (err) {
 101                 kprintf("fwdma_malloc: failed(2)\n");
 102                 /* XXX destory tag */
 103                 return(NULL);
 104         }
 105
 106         bus_dmamap_load(dma->dma_tag, dma->dma_map, dma->v_addr,
 107                 size, fwdma_map_cb, &dma->bus_addr, /*flags*/0);
 108
 109         return(dma->v_addr);
 110 }
 111
 112 void
 113 fwdma_free(struct firewire_comm *fc, struct fwdma_alloc *dma)
 114 {
 115         bus_dmamap_unload(dma->dma_tag, dma->dma_map);
 116         bus_dmamem_free(dma->dma_tag, dma->v_addr, dma->dma_map);
 117         bus_dma_tag_destroy(dma->dma_tag);
 118 }
 119
 120
 121 void *
 122 fwdma_malloc_size(bus_dma_tag_t dmat, bus_dmamap_t *dmamap,
 123         bus_size_t size, bus_addr_t *bus_addr, int flag)
 124 {
 125         void *v_addr;
 126
 127         if (bus_dmamem_alloc(dmat, &v_addr, flag, dmamap)) {
 128                 kprintf("fwdma_malloc_size: failed(1)\n");
 129                 return(NULL);
 130         }
 131         bus_dmamap_load(dmat, *dmamap, v_addr, size,
 132                         fwdma_map_cb, bus_addr, /*flags*/0);
 133         return(v_addr);
 134 }
 135
 136 void
 137 fwdma_free_size(bus_dma_tag_t dmat, bus_dmamap_t dmamap,
 138                 void *vaddr, bus_size_t size)
 139 {
 140         bus_dmamap_unload(dmat, dmamap);
 141         bus_dmamem_free(dmat, vaddr, dmamap);
 142 }
 143
 144 /*
 145  * Allocate multisegment dma buffers
 146  * each segment size is eqaul to ssize except last segment.
 147  */
 148 struct fwdma_alloc_multi *
 149 fwdma_malloc_multiseg(struct firewire_comm *fc, int alignment,
 150                 int esize, int n, int flag)
 151 {
 152         struct fwdma_alloc_multi *am;
 153         struct fwdma_seg *seg;
 154         bus_size_t ssize;
 155         int nseg;
 156
 157         if (esize > PAGE_SIZE) {
 158                 /* round up to PAGE_SIZE */
 159                 esize = ssize = roundup2(esize, PAGE_SIZE);
 160                 nseg = n;
 161         } else {
 162                 /* allocate PAGE_SIZE segment for small elements */
 163                 ssize = rounddown(PAGE_SIZE, esize);
 164                 nseg = howmany(n, ssize / esize);
 165         }
 166         am = (struct fwdma_alloc_multi *)kmalloc(sizeof(struct fwdma_alloc_multi)
 167                         + sizeof(struct fwdma_seg)*nseg, M_FW, M_WAITOK);
 168         am->ssize = ssize;
 169         am->esize = esize;
 170         am->nseg = 0;
 171         if (bus_dma_tag_create(
 172                         /*parent*/ fc->dmat,
 173                         /*alignment*/ alignment,
 174                         /*boundary*/ 0,
 175                         /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT,
 176                         /*highaddr*/ BUS_SPACE_MAXADDR,
 177                         /*filter*/NULL, /*filterarg*/NULL,
 178                         /*maxsize*/ ssize,
 179                         /*nsegments*/ 1,
 180                         /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT,
 181                         /*flags*/ BUS_DMA_ALLOCNOW,
 182 #if defined(__FreeBSD__) && __FreeBSD_version >= 501102
 183                         /*lockfunc*/busdma_lock_mutex,
 184                         /*lockarg*/&Giant,
 185 #endif
 186                         &am->dma_tag)) {
 187                 kprintf("fwdma_malloc_multiseg: tag_create failed\n");
 188                 kfree(am, M_FW);
 189                 return(NULL);
 190         }
 191
 192 #if 0
 193 #if defined(__DragonFly__) || __FreeBSD_version < 500000
 194         kprintf("malloc_multi: ssize=%d nseg=%d\n", ssize, nseg);
 195 #else
 196         kprintf("malloc_multi: ssize=%td nseg=%d\n", ssize, nseg);
 197 #endif
 198 #endif
 199         for (seg = &am->seg[0]; nseg --; seg ++) {
 200                 seg->v_addr = fwdma_malloc_size(am->dma_tag, &seg->dma_map,
 201                         ssize, &seg->bus_addr, flag);
 202                 if (seg->v_addr == NULL) {
 203                         kprintf("fwdma_malloc_multi: malloc_size failed %d\n",
 204                                 am->nseg);
 205                         fwdma_free_multiseg(am);
 206                         return(NULL);
 207                 }
 208                 am->nseg++;
 209         }
 210         return(am);
 211 }
 212
 213 void
 214 fwdma_free_multiseg(struct fwdma_alloc_multi *am)
 215 {
 216         struct fwdma_seg *seg;
 217
 218         for (seg = &am->seg[0]; am->nseg --; seg ++) {
 219                 fwdma_free_size(am->dma_tag, seg->dma_map,
 220                         seg->v_addr, am->ssize);
 221         }
 222         bus_dma_tag_destroy(am->dma_tag);
 223         kfree(am, M_FW);
 224 }