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 #include <bus/firewire/firewire.h>
  50 #include <bus/firewire/firewirereg.h>
  51 #include <bus/firewire/fwdma.h>
  52
  53 static void
  54 fwdma_map_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  55 {
  56         bus_addr_t *baddr;
  57
  58         if (error)
  59                 kprintf("fwdma_map_cb: error=%d\n", error);
  60         baddr = (bus_addr_t *)arg;
  61         *baddr = segs->ds_addr;
  62 }
  63
  64 void *
  65 fwdma_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 defined(__FreeBSD__) && __FreeBSD_version >= 501102
  83                 /*lockfunc*/busdma_lock_mutex,
  84                 /*lockarg*/&Giant,
  85 #endif
  86                 &dma->dma_tag);
  87         if (err) {
  88                 kprintf("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                 kprintf("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
 106 void
 107 fwdma_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
 115 void *
 116 fwdma_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                 kprintf("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
 130 void
 131 fwdma_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  */
 142 struct fwdma_alloc_multi *
 143 fwdma_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 *)kmalloc(sizeof(struct fwdma_alloc_multi)
 161                         + sizeof(struct fwdma_seg)*nseg, M_FW, M_WAITOK);
 162         am->ssize = ssize;
 163         am->esize = esize;
 164         am->nseg = 0;
 165         if (bus_dma_tag_create(
 166                         /*parent*/ fc->dmat,
 167                         /*alignment*/ alignment,
 168                         /*boundary*/ 0,
 169                         /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT,
 170                         /*highaddr*/ BUS_SPACE_MAXADDR,
 171                         /*filter*/NULL, /*filterarg*/NULL,
 172                         /*maxsize*/ ssize,
 173                         /*nsegments*/ 1,
 174                         /*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT,
 175                         /*flags*/ BUS_DMA_ALLOCNOW,
 176 #if defined(__FreeBSD__) && __FreeBSD_version >= 501102
 177                         /*lockfunc*/busdma_lock_mutex,
 178                         /*lockarg*/&Giant,
 179 #endif
 180                         &am->dma_tag)) {
 181                 kprintf("fwdma_malloc_multiseg: tag_create failed\n");
 182                 kfree(am, M_FW);
 183                 return(NULL);
 184         }
 185
 186 #if 0
 187         kprintf("malloc_multi: ssize=%ld nseg=%d\n", ssize, nseg);
 188 #endif
 189         for (seg = &am->seg[0]; nseg --; seg ++) {
 190                 seg->v_addr = fwdma_malloc_size(am->dma_tag, &seg->dma_map,
 191                         ssize, &seg->bus_addr, flag);
 192                 if (seg->v_addr == NULL) {
 193                         kprintf("fwdma_malloc_multi: malloc_size failed %d\n",
 194                                 am->nseg);
 195                         fwdma_free_multiseg(am);
 196                         return(NULL);
 197                 }
 198                 am->nseg++;
 199         }
 200         return(am);
 201 }
 202
 203 void
 204 fwdma_free_multiseg(struct fwdma_alloc_multi *am)
 205 {
 206         struct fwdma_seg *seg;
 207
 208         for (seg = &am->seg[0]; am->nseg --; seg ++) {
 209                 fwdma_free_size(am->dma_tag, seg->dma_map,
 210                         seg->v_addr, am->ssize);
 211         }
 212         bus_dma_tag_destroy(am->dma_tag);
 213         kfree(am, M_FW);
 214 }