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
40/* $FreeBSD: head/sys/dev/oce/oce_util.c 231437 2012-02-10 21:03:04Z luigi $ */
41
42
43#include "oce_if.h"
44
45static 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 */
58int
59oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags)
60{
61 int rc;
62
63
64 memset(dma, 0, sizeof(OCE_DMA_MEM));
65
66 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
67 8, 0,
68 BUS_SPACE_MAXADDR,
69 BUS_SPACE_MAXADDR,
70 NULL, NULL,
71 size, 1, size, 0, NULL, NULL, &dma->tag);
72
73 if (rc == 0) {
74 rc = bus_dmamem_alloc(dma->tag,
75 &dma->ptr,
76 BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
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 */
103void
104oce_dma_free(POCE_SOFTC sc, POCE_DMA_MEM dma)
105{
106 if (dma->tag == NULL)
107 return;
108
109 if (dma->map != NULL) {
110 bus_dmamap_sync(dma->tag, dma->map,
111 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
112 bus_dmamap_unload(dma->tag, dma->map);
113 }
114
115 if (dma->ptr != NULL) {
116 bus_dmamem_free(dma->tag, dma->ptr, dma->map);
117 dma->map = NULL;
118 dma->ptr = NULL;
119 }
120
121 bus_dma_tag_destroy(dma->tag);
122 dma->tag = NULL;
123
124 return;
125}
126
127
128
129/**
130 * @brief Map DMA memory segment addresses
131 * @param arg physical address pointer
132 * @param segs dma memory segments
133 * @param nseg number of dma memory segments
134 * @param error if error, zeroes the physical address
135 */
136void
137oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error)
138{
139 bus_addr_t *paddr = arg;
140
141 if (error)
142 *paddr = 0;
143 else
144 *paddr = segs->ds_addr;
145}
146
147
148
149/**
150 * @brief Destroy a ring buffer
151 * @param sc software handle to the device
152 * @param ring ring buffer
153 */
154
155void
156oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring)
157{
158 oce_dma_free(sc, &ring->dma);
159 free(ring, M_DEVBUF);
160}
161
162
163
164oce_ring_buffer_t *
165oce_create_ring_buffer(POCE_SOFTC sc,
166 uint32_t q_len, uint32_t item_size)
167{
168 uint32_t size = q_len * item_size;
169 int rc;
170 oce_ring_buffer_t *ring;
171
172
173 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO);
174 if (ring == NULL)
175 return NULL;
176
177 ring->item_size = item_size;
178 ring->num_items = q_len;
179
180 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
181 4096, 0,
182 BUS_SPACE_MAXADDR,
183 BUS_SPACE_MAXADDR,
184 NULL, NULL,
185 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag);
186 if (rc)
187 goto fail;
188
189
190 rc = bus_dmamem_alloc(ring->dma.tag,
191 &ring->dma.ptr,
192 BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
193 &ring->dma.map);
194 if (rc)
195 goto fail;
196
197 bzero(ring->dma.ptr, size);
198 bus_dmamap_sync(ring->dma.tag, ring->dma.map,
199 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
200 ring->dma.paddr = 0;
201
202 return ring;
203
204fail:
205 oce_dma_free(sc, &ring->dma);
206 free(ring, M_DEVBUF);
207 ring = NULL;
208 return NULL;
209}
210
211
212
213struct _oce_dmamap_paddr_table {
214 uint32_t max_entries;
215 uint32_t num_entries;
216 struct phys_addr *paddrs;
217};
218
219
220
221/**
222 * @brief Map ring buffer
223 * @param arg dma map phyical address table pointer
224 * @param segs dma memory segments
225 * @param nseg number of dma memory segments
226 * @param error maps only if error is 0
227 */
228static void
229oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error)
230{
231 int i;
232 struct _oce_dmamap_paddr_table *dpt =
233 (struct _oce_dmamap_paddr_table *)arg;
234
235 if (error == 0) {
236 if (nseg <= dpt->max_entries) {
237 for (i = 0; i < nseg; i++) {
238 dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr);
239 dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr);
240 }
241 dpt->num_entries = nseg;
242 }
243 }
244}
245
246
247
248/**
249 * @brief Load bus dma map for a ring buffer
250 * @param ring ring buffer pointer
251 * @param pa_list physical address list
252 * @returns number entries
253 */
254uint32_t
255oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list)
256{
257 struct _oce_dmamap_paddr_table dpt;
258
259 dpt.max_entries = 8;
260 dpt.num_entries = 0;
261 dpt.paddrs = pa_list;
262
263 bus_dmamap_load(ring->dma.tag,
264 ring->dma.map,
265 ring->dma.ptr,
266 ring->item_size * ring->num_items,
267 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT);
268
269 return dpt.num_entries;
270}