1 /*- 2 * Copyright (C) 2012 Emulex 3 * 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 are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 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 * 15 * 3. Neither the name of the Emulex Corporation nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Contact Information: 32 * freebsd-drivers@emulex.com 33 * 34 * Emulex 35 * 3333 Susan Street 36 * Costa Mesa, CA 92626 37 */ 38 39 40 /* $FreeBSD$ */ 41 42 43 #include "oce_if.h" 44 45 static void oce_dma_map_ring(void *arg, 46 bus_dma_segment_t *segs, 47 int nseg, 48 int error); 49 50 /** 51 * @brief Allocate DMA memory 52 * @param sc software handle to the device 53 * @param size bus size 54 * @param dma dma memory area 55 * @param flags creation flags 56 * @returns 0 on success, error otherwize 57 */ 58 int 59 oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags) 60 { 61 int rc; 62 63 64 memset(dma, 0, sizeof(OCE_DMA_MEM)); 65 66 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 67 8, 0, 68 BUS_SPACE_MAXADDR, 69 BUS_SPACE_MAXADDR, 70 NULL, NULL, 71 size, 1, size, 0, NULL, NULL, &dma->tag); 72 73 if (rc == 0) { 74 rc = bus_dmamem_alloc(dma->tag, 75 &dma->ptr, 76 BUS_DMA_NOWAIT | BUS_DMA_COHERENT, 77 &dma->map); 78 } 79 80 dma->paddr = 0; 81 if (rc == 0) { 82 rc = bus_dmamap_load(dma->tag, 83 dma->map, 84 dma->ptr, 85 size, 86 oce_dma_map_addr, 87 &dma->paddr, flags | BUS_DMA_NOWAIT); 88 if (dma->paddr == 0) 89 rc = ENXIO; 90 } 91 92 if (rc != 0) 93 oce_dma_free(sc, dma); 94 95 return rc; 96 } 97 98 /** 99 * @brief Free DMA memory 100 * @param sc software handle to the device 101 * @param dma dma area to free 102 */ 103 void 104 oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma) 105 { 106 if (dma->tag == NULL) 107 return; 108 109 if (dma->map != NULL) { 110 bus_dmamap_sync(dma->tag, dma->map, 111 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 112 bus_dmamap_unload(dma->tag, dma->map); 113 } 114 115 if (dma->ptr != NULL) { 116 bus_dmamem_free(dma->tag, dma->ptr, dma->map); 117 dma->map = NULL; 118 dma->ptr = NULL; 119 } 120 121 bus_dma_tag_destroy(dma->tag); 122 dma->tag = NULL; 123 124 return; 125 } 126 127 128 129 /** 130 * @brief Map DMA memory segment addresses 131 * @param arg physical address pointer 132 * @param segs dma memory segments 133 * @param nseg number of dma memory segments 134 * @param error if error, zeroes the physical address 135 */ 136 void 137 oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error) 138 { 139 bus_addr_t *paddr = arg; 140 141 if (error) 142 *paddr = 0; 143 else 144 *paddr = segs->ds_addr; 145 } 146 147 148 149 /** 150 * @brief Destroy a ring buffer 151 * @param sc software handle to the device 152 * @param ring ring buffer 153 */ 154 155 void 156 oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring) 157 { 158 oce_dma_free(sc, &ring->dma); 159 free(ring, M_DEVBUF); 160 } 161 162 163 164 oce_ring_buffer_t * 165 oce_create_ring_buffer(POCE_SOFTC sc, 166 uint32_t q_len, uint32_t item_size) 167 { 168 uint32_t size = q_len * item_size; 169 int rc; 170 oce_ring_buffer_t *ring; 171 172 173 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO); 174 if (ring == NULL) 175 return NULL; 176 177 ring->item_size = item_size; 178 ring->num_items = q_len; 179 180 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 181 4096, 0, 182 BUS_SPACE_MAXADDR, 183 BUS_SPACE_MAXADDR, 184 NULL, NULL, 185 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag); 186 if (rc) 187 goto fail; 188 189 190 rc = bus_dmamem_alloc(ring->dma.tag, 191 &ring->dma.ptr, 192 BUS_DMA_NOWAIT | BUS_DMA_COHERENT, 193 &ring->dma.map); 194 if (rc) 195 goto fail; 196 197 bzero(ring->dma.ptr, size); 198 bus_dmamap_sync(ring->dma.tag, ring->dma.map, 199 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 200 ring->dma.paddr = 0; 201 202 return ring; 203 204 fail: 205 oce_dma_free(sc, &ring->dma); 206 free(ring, M_DEVBUF); 207 ring = NULL; 208 return NULL; 209 } 210 211 212 213 struct _oce_dmamap_paddr_table { 214 uint32_t max_entries; 215 uint32_t num_entries; 216 struct phys_addr *paddrs; 217 }; 218 219 220 221 /** 222 * @brief Map ring buffer 223 * @param arg dma map phyical address table pointer 224 * @param segs dma memory segments 225 * @param nseg number of dma memory segments 226 * @param error maps only if error is 0 227 */ 228 static void 229 oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error) 230 { 231 int i; 232 struct _oce_dmamap_paddr_table *dpt = 233 (struct _oce_dmamap_paddr_table *)arg; 234 235 if (error == 0) { 236 if (nseg <= dpt->max_entries) { 237 for (i = 0; i < nseg; i++) { 238 dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr); 239 dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr); 240 } 241 dpt->num_entries = nseg; 242 } 243 } 244 } 245 246 247 248 /** 249 * @brief Load bus dma map for a ring buffer 250 * @param ring ring buffer pointer 251 * @param pa_list physical address list 252 * @returns number entries 253 */ 254 uint32_t 255 oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list) 256 { 257 struct _oce_dmamap_paddr_table dpt; 258 259 dpt.max_entries = 8; 260 dpt.num_entries = 0; 261 dpt.paddrs = pa_list; 262 263 bus_dmamap_load(ring->dma.tag, 264 ring->dma.map, 265 ring->dma.ptr, 266 ring->item_size * ring->num_items, 267 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT); 268 269 return dpt.num_entries; 270 } 271