| 1 | /* $NetBSD: fwdma.c,v 1.16 2010/05/23 18:56:58 christos Exp $ */ |
| 2 | /*- |
| 3 | * Copyright (c) 2003 |
| 4 | * Hidetoshi Shimokawa. All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. All advertising materials mentioning features or use of this software |
| 15 | * must display the following acknowledgement: |
| 16 | * |
| 17 | * This product includes software developed by Hidetoshi Shimokawa. |
| 18 | * |
| 19 | * 4. Neither the name of the author nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | * |
| 35 | */ |
| 36 | |
| 37 | #include <sys/cdefs.h> |
| 38 | __KERNEL_RCSID(0, "$NetBSD: fwdma.c,v 1.16 2010/05/23 18:56:58 christos Exp $" ); |
| 39 | #if defined(__FreeBSD__) |
| 40 | __FBSDID("$FreeBSD: src/sys/dev/firewire/fwdma.c,v 1.9 2007/06/06 14:31:36 simokawa Exp $" ); |
| 41 | #endif |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/bus.h> |
| 45 | #include <sys/device.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/types.h> |
| 48 | #include <sys/kernel.h> |
| 49 | #include <sys/malloc.h> |
| 50 | #include <sys/select.h> |
| 51 | |
| 52 | #include <machine/vmparam.h> |
| 53 | |
| 54 | #include <dev/ieee1394/firewire.h> |
| 55 | #include <dev/ieee1394/firewirereg.h> |
| 56 | #include <dev/ieee1394/fwdma.h> |
| 57 | |
| 58 | #define BUS_SPACE_MAXSIZE_32BIT 0xffffffff |
| 59 | |
| 60 | |
| 61 | void * |
| 62 | fwdma_malloc(device_t dev, bus_dma_tag_t dmat, bus_dmamap_t *dmamap, |
| 63 | bus_size_t size, int alignment, int flags) |
| 64 | { |
| 65 | bus_dma_segment_t segs; |
| 66 | int nsegs; |
| 67 | int err; |
| 68 | void *v_addr; |
| 69 | |
| 70 | err = bus_dmamem_alloc(dmat, size, alignment, 0, &segs, 1, |
| 71 | &nsegs, flags); |
| 72 | if (err) { |
| 73 | aprint_error_dev(dev, "DMA memory allocation failed %d\n" , err); |
| 74 | return NULL; |
| 75 | } |
| 76 | |
| 77 | err = bus_dmamem_map(dmat, &segs, nsegs, size, &v_addr, flags); |
| 78 | if (err) { |
| 79 | aprint_error_dev(dev, "DMA memory map failed %d\n" , err); |
| 80 | bus_dmamem_free(dmat, &segs, nsegs); |
| 81 | return NULL; |
| 82 | } |
| 83 | |
| 84 | if (*dmamap == NULL) { |
| 85 | err = bus_dmamap_create(dmat, size, nsegs, |
| 86 | BUS_SPACE_MAXSIZE_32BIT, 0, flags, dmamap); |
| 87 | if (err) { |
| 88 | aprint_error_dev(dev, |
| 89 | "DMA map create failed %d\n" , err); |
| 90 | bus_dmamem_unmap(dmat, v_addr, size); |
| 91 | bus_dmamem_free(dmat, &segs, nsegs); |
| 92 | return NULL; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | err = bus_dmamap_load(dmat, *dmamap, v_addr, size, NULL, flags); |
| 97 | if (err != 0) { |
| 98 | aprint_error_dev(dev, "DMA map load failed %d\n" , err); |
| 99 | bus_dmamap_destroy(dmat, *dmamap); |
| 100 | bus_dmamem_unmap(dmat, v_addr, size); |
| 101 | bus_dmamem_free(dmat, &segs, nsegs); |
| 102 | return NULL; |
| 103 | } |
| 104 | |
| 105 | return v_addr; |
| 106 | } |
| 107 | |
| 108 | void |
| 109 | fwdma_free(bus_dma_tag_t dmat, bus_dmamap_t dmamap, void *vaddr) |
| 110 | { |
| 111 | |
| 112 | bus_dmamap_unload(dmat, dmamap); |
| 113 | bus_dmamem_unmap(dmat, vaddr, dmamap->dm_mapsize); |
| 114 | bus_dmamem_free(dmat, dmamap->dm_segs, dmamap->dm_nsegs); |
| 115 | bus_dmamap_destroy(dmat, dmamap); |
| 116 | } |
| 117 | |
| 118 | |
| 119 | void * |
| 120 | fwdma_alloc_setup(device_t dev, bus_dma_tag_t dmat, bus_size_t size, |
| 121 | struct fwdma_alloc *dma, int alignment, int flags) |
| 122 | { |
| 123 | |
| 124 | dma->v_addr = |
| 125 | fwdma_malloc(dev, dmat, &dma->dma_map, size, alignment, flags); |
| 126 | if (dma->v_addr != NULL) { |
| 127 | dma->dma_tag = dmat; |
| 128 | dma->bus_addr = dma->dma_map->dm_segs[0].ds_addr; |
| 129 | } |
| 130 | return dma->v_addr; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Allocate multisegment dma buffers |
| 135 | * each segment size is eqaul to ssize except last segment. |
| 136 | */ |
| 137 | struct fwdma_alloc_multi * |
| 138 | fwdma_malloc_multiseg(struct firewire_comm *fc, int alignment, int esize, int n, |
| 139 | int flags) |
| 140 | { |
| 141 | struct fwdma_alloc_multi *am; |
| 142 | struct fwdma_seg *seg; |
| 143 | bus_size_t ssize; |
| 144 | size_t size; |
| 145 | int nseg; |
| 146 | |
| 147 | if (esize > PAGE_SIZE) { |
| 148 | /* round up to PAGE_SIZE */ |
| 149 | esize = ssize = roundup2(esize, PAGE_SIZE); |
| 150 | nseg = n; |
| 151 | } else { |
| 152 | /* allocate PAGE_SIZE segment for small elements */ |
| 153 | ssize = rounddown(PAGE_SIZE, esize); |
| 154 | nseg = howmany(n, ssize / esize); |
| 155 | } |
| 156 | size = sizeof(struct fwdma_alloc_multi) + |
| 157 | sizeof(struct fwdma_seg) * nseg; |
| 158 | am = (struct fwdma_alloc_multi *)malloc(size, M_FW, M_WAITOK | M_ZERO); |
| 159 | if (am == NULL) { |
| 160 | aprint_error_dev(fc->dev, "malloc failed\n" ); |
| 161 | return NULL; |
| 162 | } |
| 163 | am->ssize = ssize; |
| 164 | am->esize = esize; |
| 165 | am->nseg = 0; |
| 166 | am->dma_tag = fc->dmat; |
| 167 | |
| 168 | for (seg = am->seg; nseg--; seg++) { |
| 169 | seg->v_addr = fwdma_malloc(fc->dev, am->dma_tag, &seg->dma_map, |
| 170 | ssize, alignment, flags); |
| 171 | if (seg->v_addr == NULL) { |
| 172 | aprint_error_dev(fc->dev, "malloc_size failed %d\n" , |
| 173 | am->nseg); |
| 174 | fwdma_free_multiseg(am); |
| 175 | return NULL; |
| 176 | } |
| 177 | seg->bus_addr = seg->dma_map->dm_segs[0].ds_addr; |
| 178 | am->nseg++; |
| 179 | } |
| 180 | return am; |
| 181 | } |
| 182 | |
| 183 | void |
| 184 | fwdma_free_multiseg(struct fwdma_alloc_multi *am) |
| 185 | { |
| 186 | struct fwdma_seg *seg; |
| 187 | |
| 188 | for (seg = am->seg; am->nseg--; seg++) |
| 189 | fwdma_free(am->dma_tag, seg->dma_map, seg->v_addr); |
| 190 | free(am, M_FW); |
| 191 | } |
| 192 | |