1 /*- 2 * Copyright (C) 2013 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 BUS_DMA_ZERO, 76 &dma->map); 77 } 78 79 dma->paddr = 0; 80 if (rc == 0) { 81 rc = bus_dmamap_load(dma->tag, 82 dma->map, 83 dma->ptr, 84 size, 85 oce_dma_map_addr, 86 &dma->paddr, flags | BUS_DMA_NOWAIT); 87 if (dma->paddr == 0) 88 rc = ENXIO; 89 } 90 91 if (rc != 0) 92 oce_dma_free(sc, dma); 93 94 return rc; 95 } 96 97 /** 98 * @brief Free DMA memory 99 * @param sc software handle to the device 100 * @param dma dma area to free 101 */ 102 void 103 oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma) 104 { 105 if (dma->tag == NULL) 106 return; 107 108 if (dma->paddr != 0) { 109 bus_dmamap_sync(dma->tag, dma->map, 110 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 111 bus_dmamap_unload(dma->tag, dma->map); 112 dma->paddr = 0; 113 } 114 115 if (dma->ptr != NULL) { 116 bus_dmamem_free(dma->tag, dma->ptr, dma->map); 117 dma->ptr = NULL; 118 } 119 120 bus_dma_tag_destroy(dma->tag); 121 dma->tag = NULL; 122 123 return; 124 } 125 126 127 128 /** 129 * @brief Map DMA memory segment addresses 130 * @param arg physical address pointer 131 * @param segs dma memory segments 132 * @param nseg number of dma memory segments 133 * @param error if error, zeroes the physical address 134 */ 135 void 136 oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error) 137 { 138 bus_addr_t *paddr = arg; 139 140 if (error) 141 *paddr = 0; 142 else 143 *paddr = segs->ds_addr; 144 } 145 146 147 148 /** 149 * @brief Destroy a ring buffer 150 * @param sc software handle to the device 151 * @param ring ring buffer 152 */ 153 154 void 155 oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring) 156 { 157 oce_dma_free(sc, &ring->dma); 158 free(ring, M_DEVBUF); 159 } 160 161 162 163 oce_ring_buffer_t * 164 oce_create_ring_buffer(POCE_SOFTC sc, 165 uint32_t q_len, uint32_t item_size) 166 { 167 uint32_t size = q_len * item_size; 168 int rc; 169 oce_ring_buffer_t *ring; 170 171 172 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO); 173 if (ring == NULL) 174 return NULL; 175 176 ring->item_size = item_size; 177 ring->num_items = q_len; 178 179 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 180 4096, 0, 181 BUS_SPACE_MAXADDR, 182 BUS_SPACE_MAXADDR, 183 NULL, NULL, 184 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag); 185 if (rc) 186 goto fail; 187 188 189 rc = bus_dmamem_alloc(ring->dma.tag, 190 &ring->dma.ptr, 191 BUS_DMA_NOWAIT | BUS_DMA_COHERENT, 192 &ring->dma.map); 193 if (rc) 194 goto fail; 195 196 bzero(ring->dma.ptr, size); 197 bus_dmamap_sync(ring->dma.tag, ring->dma.map, 198 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 199 ring->dma.paddr = 0; 200 201 return ring; 202 203 fail: 204 oce_dma_free(sc, &ring->dma); 205 free(ring, M_DEVBUF); 206 ring = NULL; 207 return NULL; 208 } 209 210 211 212 struct _oce_dmamap_paddr_table { 213 uint32_t max_entries; 214 uint32_t num_entries; 215 struct phys_addr *paddrs; 216 }; 217 218 219 220 /** 221 * @brief Map ring buffer 222 * @param arg dma map phyical address table pointer 223 * @param segs dma memory segments 224 * @param nseg number of dma memory segments 225 * @param error maps only if error is 0 226 */ 227 static void 228 oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error) 229 { 230 int i; 231 struct _oce_dmamap_paddr_table *dpt = 232 (struct _oce_dmamap_paddr_table *)arg; 233 234 if (error == 0) { 235 if (nseg <= dpt->max_entries) { 236 for (i = 0; i < nseg; i++) { 237 dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr); 238 dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr); 239 } 240 dpt->num_entries = nseg; 241 } 242 } 243 } 244 245 246 247 /** 248 * @brief Load bus dma map for a ring buffer 249 * @param ring ring buffer pointer 250 * @param pa_list physical address list 251 * @returns number entries 252 */ 253 uint32_t 254 oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list) 255 { 256 struct _oce_dmamap_paddr_table dpt; 257 258 dpt.max_entries = 8; 259 dpt.num_entries = 0; 260 dpt.paddrs = pa_list; 261 262 bus_dmamap_load(ring->dma.tag, 263 ring->dma.map, 264 ring->dma.ptr, 265 ring->item_size * ring->num_items, 266 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT); 267 268 return dpt.num_entries; 269 } 270