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
42 #include "oce_if.h"
43
44 static void oce_dma_map_ring(void *arg,
45 bus_dma_segment_t *segs,
46 int nseg,
47 int error);
48
49 /**
50 * @brief Allocate DMA memory
51 * @param sc software handle to the device
52 * @param size bus size
53 * @param dma dma memory area
54 * @param flags creation flags
55 * @returns 0 on success, error otherwize
56 */
57 int
oce_dma_alloc(POCE_SOFTC sc,bus_size_t size,POCE_DMA_MEM dma,int flags)58 oce_dma_alloc(POCE_SOFTC sc, bus_size_t size, POCE_DMA_MEM dma, int flags)
59 {
60 int rc;
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
oce_dma_free(POCE_SOFTC sc,POCE_DMA_MEM dma)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 * @brief Map DMA memory segment addresses
128 * @param arg physical address pointer
129 * @param segs dma memory segments
130 * @param nseg number of dma memory segments
131 * @param error if error, zeroes the physical address
132 */
133 void
oce_dma_map_addr(void * arg,bus_dma_segment_t * segs,int nseg,int error)134 oce_dma_map_addr(void *arg, bus_dma_segment_t * segs, int nseg, int error)
135 {
136 bus_addr_t *paddr = arg;
137
138 if (error)
139 *paddr = 0;
140 else
141 *paddr = segs->ds_addr;
142 }
143
144 /**
145 * @brief Destroy a ring buffer
146 * @param sc software handle to the device
147 * @param ring ring buffer
148 */
149
150 void
oce_destroy_ring_buffer(POCE_SOFTC sc,oce_ring_buffer_t * ring)151 oce_destroy_ring_buffer(POCE_SOFTC sc, oce_ring_buffer_t *ring)
152 {
153 oce_dma_free(sc, &ring->dma);
154 free(ring, M_DEVBUF);
155 }
156
157 oce_ring_buffer_t *
oce_create_ring_buffer(POCE_SOFTC sc,uint32_t q_len,uint32_t item_size)158 oce_create_ring_buffer(POCE_SOFTC sc,
159 uint32_t q_len, uint32_t item_size)
160 {
161 uint32_t size = q_len * item_size;
162 int rc;
163 oce_ring_buffer_t *ring;
164
165 ring = malloc(sizeof(oce_ring_buffer_t), M_DEVBUF, M_NOWAIT | M_ZERO);
166 if (ring == NULL)
167 return NULL;
168
169 ring->item_size = item_size;
170 ring->num_items = q_len;
171
172 rc = bus_dma_tag_create(bus_get_dma_tag(sc->dev),
173 4096, 0,
174 BUS_SPACE_MAXADDR,
175 BUS_SPACE_MAXADDR,
176 NULL, NULL,
177 size, 8, 4096, 0, NULL, NULL, &ring->dma.tag);
178 if (rc)
179 goto fail;
180
181 rc = bus_dmamem_alloc(ring->dma.tag,
182 &ring->dma.ptr,
183 BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
184 &ring->dma.map);
185 if (rc)
186 goto fail;
187
188 bzero(ring->dma.ptr, size);
189 bus_dmamap_sync(ring->dma.tag, ring->dma.map,
190 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
191 ring->dma.paddr = 0;
192
193 return ring;
194
195 fail:
196 oce_dma_free(sc, &ring->dma);
197 free(ring, M_DEVBUF);
198 ring = NULL;
199 return NULL;
200 }
201
202 struct _oce_dmamap_paddr_table {
203 uint32_t max_entries;
204 uint32_t num_entries;
205 struct phys_addr *paddrs;
206 };
207
208 /**
209 * @brief Map ring buffer
210 * @param arg dma map phyical address table pointer
211 * @param segs dma memory segments
212 * @param nseg number of dma memory segments
213 * @param error maps only if error is 0
214 */
215 static void
oce_dma_map_ring(void * arg,bus_dma_segment_t * segs,int nseg,int error)216 oce_dma_map_ring(void *arg, bus_dma_segment_t * segs, int nseg, int error)
217 {
218 int i;
219 struct _oce_dmamap_paddr_table *dpt =
220 (struct _oce_dmamap_paddr_table *)arg;
221
222 if (error == 0) {
223 if (nseg <= dpt->max_entries) {
224 for (i = 0; i < nseg; i++) {
225 dpt->paddrs[i].lo = ADDR_LO(segs[i].ds_addr);
226 dpt->paddrs[i].hi = ADDR_HI(segs[i].ds_addr);
227 }
228 dpt->num_entries = nseg;
229 }
230 }
231 }
232
233 /**
234 * @brief Load bus dma map for a ring buffer
235 * @param ring ring buffer pointer
236 * @param pa_list physical address list
237 * @returns number entries
238 */
239 uint32_t
oce_page_list(oce_ring_buffer_t * ring,struct phys_addr * pa_list)240 oce_page_list(oce_ring_buffer_t *ring, struct phys_addr *pa_list)
241 {
242 struct _oce_dmamap_paddr_table dpt;
243
244 dpt.max_entries = 8;
245 dpt.num_entries = 0;
246 dpt.paddrs = pa_list;
247
248 bus_dmamap_load(ring->dma.tag,
249 ring->dma.map,
250 ring->dma.ptr,
251 ring->item_size * ring->num_items,
252 oce_dma_map_ring, &dpt, BUS_DMA_NOWAIT);
253
254 return dpt.num_entries;
255 }
256