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
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41#include "oce_if.h"
42
43static 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 */
56int
57oce_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 */
102void
103oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma)
104{
105 if (dma->tag == NULL)
106 return;
107
108 if (dma->map != NULL) {
109 bus_dmamap_sync(dma->tag, dma->map,
110 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
111 bus_dmamap_unload(dma->tag, dma->map);
112 }
113
114 if (dma->ptr != NULL) {
115 bus_dmamem_free(dma->tag, dma->ptr, dma->map);
116 dma->map = NULL;
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 */
135void
136oce_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
154void
155oce_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
163oce_ring_buffer_t *
164oce_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
203fail:
204 oce_dma_free(sc, &ring->dma);
205 free(ring, M_DEVBUF);
206 ring = NULL;
207 return NULL;
208}
209
210
211
212struct _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 */
227static void
228oce_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 */
253uint32_t
254oce_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}
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