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 /* $FreeBSD$ */ 40 41 #include "oce_if.h" 42 43 static void oce_dma_map_ring(void *arg, 44 bus_dma_segment_t *segs, 45 int nseg, 46 int error); 47 48 /** 49 * @brief Allocate DMA memory 50 * @param sc software handle to the device 51 * @param size bus size 52 * @param dma dma memory area 53 * @param flags creation flags 54 * @returns 0 on success, error otherwize 55 */ 56 int 57 oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags) 58 { 59 int rc; 60 61 62 memset(dma, 0, sizeof(OCE_DMA_MEM)); 63 64 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 65 8, 0, 66 BUS_SPACE_MAXADDR, 67 BUS_SPACE_MAXADDR, 68 NULL, NULL, 69 size, 1, size, 0, NULL, NULL, &dma->tag); 70 71 if (rc == 0) { 72 rc = bus_dmamem_alloc(dma->tag, 73 &dma->ptr, 74 BUS_DMA_NOWAIT | BUS_DMA_COHERENT, 75 &dma->map); 76 } 77 78 dma->paddr = 0; 79 if (rc == 0) { 80 rc = bus_dmamap_load(dma->tag, 81 dma->map, 82 dma->ptr, 83 size, 84 oce_dma_map_addr, 85 &dma->paddr, flags | BUS_DMA_NOWAIT); 86 if (dma->paddr == 0) 87 rc = ENXIO; 88 } 89 90 if (rc != 0) 91 oce_dma_free(sc, dma); 92 93 return rc; 94 } 95 96 /** 97 * @brief Free DMA memory 98 * @param sc software handle to the device 99 * @param dma dma area to free 100 */ 101 void 102 oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma) 103 { 104 if (dma->tag == NULL) 105 return; 106 107 if (dma->map != NULL) { 108 bus_dmamap_sync(dma->tag, dma->map, 109 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 110 bus_dmamap_unload(dma->tag, dma->map); 111 } 112 113 if (dma->ptr != NULL) { 114 bus_dmamem_free(dma->tag, dma->ptr, dma->map); 115 dma->map = NULL; 116 dma->ptr = NULL; 117 } 118 119 bus_dma_tag_destroy(dma->tag); 120 dma->tag = NULL; 121 122 return; 123 } 124 125 126 127 /** 128 * @brief Map DMA memory segment addresses 129 * @param arg physical address pointer 130 * @param segs dma memory segments 131 * @param nseg number of dma memory segments 132 * @param error if error, zeroes the physical address 133 */ 134 void 135 oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error) 136 { 137 bus_addr_t *paddr = arg; 138 139 if (error) 140 *paddr = 0; 141 else 142 *paddr = segs->ds_addr; 143 } 144 145 146 147 /** 148 * @brief Destroy a ring buffer 149 * @param sc software handle to the device 150 * @param ring ring buffer 151 */ 152 153 void 154 oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring) 155 { 156 oce_dma_free(sc, &ring->dma); 157 free(ring, M_DEVBUF); 158 } 159 160 161 162 oce_ring_buffer_t * 163 oce_create_ring_buffer(POCE_SOFTC sc, 164 uint32_t q_len, uint32_t item_size) 165 { 166 uint32_t size = q_len * item_size; 167 int rc; 168 oce_ring_buffer_t *ring; 169 170 171 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO); 172 if (ring == NULL) 173 return NULL; 174 175 ring->item_size = item_size; 176 ring->num_items = q_len; 177 178 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 179 4096, 0, 180 BUS_SPACE_MAXADDR, 181 BUS_SPACE_MAXADDR, 182 NULL, NULL, 183 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag); 184 if (rc) 185 goto fail; 186 187 188 rc = bus_dmamem_alloc(ring->dma.tag, 189 &ring->dma.ptr, 190 BUS_DMA_NOWAIT | BUS_DMA_COHERENT, 191 &ring->dma.map); 192 if (rc) 193 goto fail; 194 195 bzero(ring->dma.ptr, size); 196 bus_dmamap_sync(ring->dma.tag, ring->dma.map, 197 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 198 ring->dma.paddr = 0; 199 200 return ring; 201 202 fail: 203 oce_dma_free(sc, &ring->dma); 204 free(ring, M_DEVBUF); 205 ring = NULL; 206 return NULL; 207 } 208 209 210 211 struct _oce_dmamap_paddr_table { 212 uint32_t max_entries; 213 uint32_t num_entries; 214 struct phys_addr *paddrs; 215 }; 216 217 218 219 /** 220 * @brief Map ring buffer 221 * @param arg dma map phyical address table pointer 222 * @param segs dma memory segments 223 * @param nseg number of dma memory segments 224 * @param error maps only if error is 0 225 */ 226 static void 227 oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error) 228 { 229 int i; 230 struct _oce_dmamap_paddr_table *dpt = 231 (struct _oce_dmamap_paddr_table *)arg; 232 233 if (error == 0) { 234 if (nseg <= dpt->max_entries) { 235 for (i = 0; i < nseg; i++) { 236 dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr); 237 dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr); 238 } 239 dpt->num_entries = nseg; 240 } 241 } 242 } 243 244 245 246 /** 247 * @brief Load bus dma map for a ring buffer 248 * @param ring ring buffer pointer 249 * @param pa_list physical address list 250 * @returns number entries 251 */ 252 uint32_t 253 oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list) 254 { 255 struct _oce_dmamap_paddr_table dpt; 256 257 dpt.max_entries = 8; 258 dpt.num_entries = 0; 259 dpt.paddrs = pa_list; 260 261 bus_dmamap_load(ring->dma.tag, 262 ring->dma.map, 263 ring->dma.ptr, 264 ring->item_size * ring->num_items, 265 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT); 266 267 return dpt.num_entries; 268 } 269