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
39/* $FreeBSD$ */
40
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->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
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}
270