2 * Copyright (C) 2013 Emulex
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * 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.
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.
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.
31 * Contact Information:
32 * freebsd-drivers@emulex.com
36 * Costa Mesa, CA 92626
43 static void oce_dma_map_ring(void *arg,
44 bus_dma_segment_t *segs,
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
57 oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags)
62 memset(dma, 0, sizeof(OCE_DMA_MEM));
64 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
69 size, 1, size, 0, NULL, NULL, &dma->tag);
72 rc = bus_dmamem_alloc(dma->tag,
74 BUS_DMA_NOWAIT | BUS_DMA_COHERENT |
81 rc = bus_dmamap_load(dma->tag,
86 &dma->paddr, flags | BUS_DMA_NOWAIT);
92 oce_dma_free(sc, dma);
98 * @brief Free DMA memory
99 * @param sc software handle to the device
100 * @param dma dma area to free
103 oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma)
105 if (dma->tag == NULL)
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);
115 if (dma->ptr != NULL) {
116 bus_dmamem_free(dma->tag, dma->ptr, dma->map);
120 bus_dma_tag_destroy(dma->tag);
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
136 oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error)
138 bus_addr_t *paddr = arg;
143 *paddr = segs->ds_addr;
149 * @brief Destroy a ring buffer
150 * @param sc software handle to the device
151 * @param ring ring buffer
155 oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring)
157 oce_dma_free(sc, &ring->dma);
158 free(ring, M_DEVBUF);
164 oce_create_ring_buffer(POCE_SOFTC sc,
165 uint32_t q_len, uint32_t item_size)
167 uint32_t size = q_len * item_size;
169 oce_ring_buffer_t *ring;
172 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO);
176 ring->item_size = item_size;
177 ring->num_items = q_len;
179 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
184 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag);
189 rc = bus_dmamem_alloc(ring->dma.tag,
191 BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
196 bzero(ring->dma.ptr, size);
197 bus_dmamap_sync(ring->dma.tag, ring->dma.map,
198 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
204 oce_dma_free(sc, &ring->dma);
205 free(ring, M_DEVBUF);
212 struct _oce_dmamap_paddr_table {
213 uint32_t max_entries;
214 uint32_t num_entries;
215 struct phys_addr *paddrs;
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
228 oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error)
231 struct _oce_dmamap_paddr_table *dpt =
232 (struct _oce_dmamap_paddr_table *)arg;
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);
240 dpt->num_entries = nseg;
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
254 oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list)
256 struct _oce_dmamap_paddr_table dpt;
260 dpt.paddrs = pa_list;
262 bus_dmamap_load(ring->dma.tag,
265 ring->item_size * ring->num_items,
266 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT);
268 return dpt.num_entries;