1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 2013 Emulex 5 * 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 are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Emulex Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived from 19 * this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Contact Information: 34 * freebsd-drivers@emulex.com 35 * 36 * Emulex 37 * 3333 Susan Street 38 * Costa Mesa, CA 92626 39 */ 40 41 /* $FreeBSD$ */ 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 memset(dma, 0, sizeof(OCE_DMA_MEM)); 64 65 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 66 8, 0, 67 BUS_SPACE_MAXADDR, 68 BUS_SPACE_MAXADDR, 69 NULL, NULL, 70 size, 1, size, 0, NULL, NULL, &dma->tag); 71 72 if (rc == 0) { 73 rc = bus_dmamem_alloc(dma->tag, 74 &dma->ptr, 75 BUS_DMA_NOWAIT | BUS_DMA_COHERENT | 76 BUS_DMA_ZERO, 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->paddr != 0) { 110 bus_dmamap_sync(dma->tag, dma->map, 111 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 112 bus_dmamap_unload(dma->tag, dma->map); 113 dma->paddr = 0; 114 } 115 116 if (dma->ptr != NULL) { 117 bus_dmamem_free(dma->tag, dma->ptr, dma->map); 118 dma->ptr = NULL; 119 } 120 121 bus_dma_tag_destroy(dma->tag); 122 dma->tag = NULL; 123 124 return; 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 * @brief Destroy a ring buffer 147 * @param sc software handle to the device 148 * @param ring ring buffer 149 */ 150 151 void 152 oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring) 153 { 154 oce_dma_free(sc, &ring->dma); 155 free(ring, M_DEVBUF); 156 } 157 158 oce_ring_buffer_t * 159 oce_create_ring_buffer(POCE_SOFTC sc, 160 uint32_t q_len, uint32_t item_size) 161 { 162 uint32_t size = q_len * item_size; 163 int rc; 164 oce_ring_buffer_t *ring; 165 166 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO); 167 if (ring == NULL) 168 return NULL; 169 170 ring->item_size = item_size; 171 ring->num_items = q_len; 172 173 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev), 174 4096, 0, 175 BUS_SPACE_MAXADDR, 176 BUS_SPACE_MAXADDR, 177 NULL, NULL, 178 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag); 179 if (rc) 180 goto fail; 181 182 rc = bus_dmamem_alloc(ring->dma.tag, 183 &ring->dma.ptr, 184 BUS_DMA_NOWAIT | BUS_DMA_COHERENT, 185 &ring->dma.map); 186 if (rc) 187 goto fail; 188 189 bzero(ring->dma.ptr, size); 190 bus_dmamap_sync(ring->dma.tag, ring->dma.map, 191 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 192 ring->dma.paddr = 0; 193 194 return ring; 195 196 fail: 197 oce_dma_free(sc, &ring->dma); 198 free(ring, M_DEVBUF); 199 ring = NULL; 200 return NULL; 201 } 202 203 struct _oce_dmamap_paddr_table { 204 uint32_t max_entries; 205 uint32_t num_entries; 206 struct phys_addr *paddrs; 207 }; 208 209 /** 210 * @brief Map ring buffer 211 * @param arg dma map phyical address table pointer 212 * @param segs dma memory segments 213 * @param nseg number of dma memory segments 214 * @param error maps only if error is 0 215 */ 216 static void 217 oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error) 218 { 219 int i; 220 struct _oce_dmamap_paddr_table *dpt = 221 (struct _oce_dmamap_paddr_table *)arg; 222 223 if (error == 0) { 224 if (nseg <= dpt->max_entries) { 225 for (i = 0; i < nseg; i++) { 226 dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr); 227 dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr); 228 } 229 dpt->num_entries = nseg; 230 } 231 } 232 } 233 234 /** 235 * @brief Load bus dma map for a ring buffer 236 * @param ring ring buffer pointer 237 * @param pa_list physical address list 238 * @returns number entries 239 */ 240 uint32_t 241 oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list) 242 { 243 struct _oce_dmamap_paddr_table dpt; 244 245 dpt.max_entries = 8; 246 dpt.num_entries = 0; 247 dpt.paddrs = pa_list; 248 249 bus_dmamap_load(ring->dma.tag, 250 ring->dma.map, 251 ring->dma.ptr, 252 ring->item_size * ring->num_items, 253 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT); 254 255 return dpt.num_entries; 256 } 257