fwdma.c

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    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("$FreeBSD$");
   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 
   58 static void
   59 fwdma_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 
   69 void *
   70 fwdma_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 
  109 void
  110 fwdma_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 
  118 void *
  119 fwdma_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 
  133 void
  134 fwdma_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  */
  145 struct fwdma_alloc_multi *
  146 fwdma_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 
  201 void
  202 fwdma_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 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/firewire/fwdma.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/firewire/fwdma.c