fwdma.c revision 127468 
1/*
2 * Copyright (c) 2003
3 * 	Hidetoshi Shimokawa. 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
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *
16 *	This product includes software developed by Hidetoshi Shimokawa.
17 *
18 * 4. Neither the name of the author nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35
36#ifdef __FreeBSD__
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/sys/dev/firewire/fwdma.c 127468 2004-03-26 23:17:10Z simokawa $");
39#endif
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/types.h>
44#include <sys/kernel.h>
45#include <sys/malloc.h>
46#if defined(__FreeBSD__) && __FreeBSD_version >= 501102
47#include <sys/lock.h>
48#include <sys/mutex.h>
49#endif
50
51#include <sys/bus.h>
52#include <machine/bus.h>
53
54#ifdef __DragonFly__
55#include <bus/firewire/firewire.h>
56#include <bus/firewire/firewirereg.h>
57#include <bus/firewire/fwdma.h>
58#else
59#include <dev/firewire/firewire.h>
60#include <dev/firewire/firewirereg.h>
61#include <dev/firewire/fwdma.h>
62#endif
63
64static void
65fwdma_map_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
66{
67	bus_addr_t *baddr;
68
69	if (error)
70		printf("fwdma_map_cb: error=%d\n", error);
71	baddr = (bus_addr_t *)arg;
72	*baddr = segs->ds_addr;
73}
74
75void *
76fwdma_malloc(struct firewire_comm *fc, int alignment, bus_size_t size,
77	struct fwdma_alloc *dma, int flag)
78{
79	int err;
80
81	dma->v_addr = NULL;
82	err = bus_dma_tag_create(
83		/*parent*/ fc->dmat,
84		/*alignment*/ alignment,
85		/*boundary*/ 0,
86		/*lowaddr*/ BUS_SPACE_MAXADDR_32BIT,
87		/*highaddr*/ BUS_SPACE_MAXADDR,
88		/*filter*/NULL, /*filterarg*/NULL,
89		/*maxsize*/ size,
90		/*nsegments*/ 1,
91		/*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT,
92		/*flags*/ BUS_DMA_ALLOCNOW,
93#if defined(__FreeBSD__) && __FreeBSD_version >= 501102
94		/*lockfunc*/busdma_lock_mutex,
95		/*lockarg*/&Giant,
96#endif
97		&dma->dma_tag);
98	if (err) {
99		printf("fwdma_malloc: failed(1)\n");
100		return(NULL);
101	}
102
103	err = bus_dmamem_alloc(dma->dma_tag, &dma->v_addr,
104		flag, &dma->dma_map);
105	if (err) {
106		printf("fwdma_malloc: failed(2)\n");
107		/* XXX destory tag */
108		return(NULL);
109	}
110
111	bus_dmamap_load(dma->dma_tag, dma->dma_map, dma->v_addr,
112		size, fwdma_map_cb, &dma->bus_addr, /*flags*/0);
113
114	return(dma->v_addr);
115}
116
117void
118fwdma_free(struct firewire_comm *fc, struct fwdma_alloc *dma)
119{
120        bus_dmamap_unload(dma->dma_tag, dma->dma_map);
121	bus_dmamem_free(dma->dma_tag, dma->v_addr, dma->dma_map);
122	bus_dma_tag_destroy(dma->dma_tag);
123}
124
125
126void *
127fwdma_malloc_size(bus_dma_tag_t dmat, bus_dmamap_t *dmamap,
128	bus_size_t size, bus_addr_t *bus_addr, int flag)
129{
130	void *v_addr;
131
132	if (bus_dmamem_alloc(dmat, &v_addr, flag, dmamap)) {
133		printf("fwdma_malloc_size: failed(1)\n");
134		return(NULL);
135	}
136	bus_dmamap_load(dmat, *dmamap, v_addr, size,
137			fwdma_map_cb, bus_addr, /*flags*/0);
138	return(v_addr);
139}
140
141void
142fwdma_free_size(bus_dma_tag_t dmat, bus_dmamap_t dmamap,
143		void *vaddr, bus_size_t size)
144{
145	bus_dmamap_unload(dmat, dmamap);
146	bus_dmamem_free(dmat, vaddr, dmamap);
147}
148
149/*
150 * Allocate multisegment dma buffers
151 * each segment size is eqaul to ssize except last segment.
152 */
153struct fwdma_alloc_multi *
154fwdma_malloc_multiseg(struct firewire_comm *fc, int alignment,
155		int esize, int n, int flag)
156{
157	struct fwdma_alloc_multi *am;
158	struct fwdma_seg *seg;
159	bus_size_t ssize;
160	int nseg;
161
162	if (esize > PAGE_SIZE) {
163		/* round up to PAGE_SIZE */
164		esize = ssize = roundup2(esize, PAGE_SIZE);
165		nseg = n;
166	} else {
167		/* allocate PAGE_SIZE segment for small elements */
168		ssize = rounddown(PAGE_SIZE, esize);
169		nseg = howmany(n, ssize / esize);
170	}
171	am = (struct fwdma_alloc_multi *)malloc(sizeof(struct fwdma_alloc_multi)
172			+ sizeof(struct fwdma_seg)*nseg, M_FW, M_WAITOK);
173	if (am == NULL) {
174		printf("fwdma_malloc_multiseg: malloc failed\n");
175		return(NULL);
176	}
177	am->ssize = ssize;
178	am->esize = esize;
179	am->nseg = 0;
180	if (bus_dma_tag_create(
181			/*parent*/ fc->dmat,
182			/*alignment*/ alignment,
183			/*boundary*/ 0,
184			/*lowaddr*/ BUS_SPACE_MAXADDR_32BIT,
185			/*highaddr*/ BUS_SPACE_MAXADDR,
186			/*filter*/NULL, /*filterarg*/NULL,
187			/*maxsize*/ ssize,
188			/*nsegments*/ 1,
189			/*maxsegsz*/ BUS_SPACE_MAXSIZE_32BIT,
190			/*flags*/ BUS_DMA_ALLOCNOW,
191#if defined(__FreeBSD__) && __FreeBSD_version >= 501102
192			/*lockfunc*/busdma_lock_mutex,
193			/*lockarg*/&Giant,
194#endif
195			&am->dma_tag)) {
196		printf("fwdma_malloc_multiseg: tag_create failed\n");
197		free(am, M_FW);
198		return(NULL);
199	}
200
201#if 0
202#if defined(__DragonFly__) || __FreeBSD_version < 500000
203	printf("malloc_multi: ssize=%d nseg=%d\n", ssize, nseg);
204#else
205	printf("malloc_multi: ssize=%td nseg=%d\n", ssize, nseg);
206#endif
207#endif
208	for (seg = &am->seg[0]; nseg --; seg ++) {
209		seg->v_addr = fwdma_malloc_size(am->dma_tag, &seg->dma_map,
210			ssize, &seg->bus_addr, flag);
211		if (seg->v_addr == NULL) {
212			printf("fwdma_malloc_multi: malloc_size failed %d\n",
213				am->nseg);
214			fwdma_free_multiseg(am);
215			return(NULL);
216		}
217		am->nseg++;
218	}
219	return(am);
220}
221
222void
223fwdma_free_multiseg(struct fwdma_alloc_multi *am)
224{
225	struct fwdma_seg *seg;
226
227	for (seg = &am->seg[0]; am->nseg --; seg ++) {
228		fwdma_free_size(am->dma_tag, seg->dma_map,
229			seg->v_addr, am->ssize);
230	}
231	bus_dma_tag_destroy(am->dma_tag);
232	free(am, M_FW);
233}
234