2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Sepherosa Ziehau <sepherosa@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bus_dma.h>
40 _bus_dmamem_coherent_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
42 bus_addr_t *addr = arg;
47 KASSERT(nseg == 1, ("too many DMA segments, %d should be 1", nseg));
48 *addr = segs->ds_addr;
52 bus_dmamem_coherent(bus_dma_tag_t parent,
53 bus_size_t alignment, bus_size_t boundary,
54 bus_addr_t lowaddr, bus_addr_t highaddr,
55 bus_size_t maxsize, int flags,
60 bzero(dmem, sizeof(*dmem));
62 error = bus_dma_tag_create(parent, alignment, boundary,
63 lowaddr, highaddr, NULL, NULL,
64 maxsize, 1, maxsize, 0,
69 error = bus_dmamem_alloc(dmem->dmem_tag, &dmem->dmem_addr,
70 flags | BUS_DMA_COHERENT, &dmem->dmem_map);
72 bus_dma_tag_destroy(dmem->dmem_tag);
73 bzero(dmem, sizeof(*dmem));
77 error = bus_dmamap_load(dmem->dmem_tag, dmem->dmem_map,
78 dmem->dmem_addr, maxsize,
79 _bus_dmamem_coherent_cb, &dmem->dmem_busaddr,
80 flags & BUS_DMA_NOWAIT);
82 if (error == EINPROGRESS) {
83 panic("DMA coherent memory loading is still "
86 bus_dmamem_free(dmem->dmem_tag, dmem->dmem_addr,
88 bus_dma_tag_destroy(dmem->dmem_tag);
89 bzero(dmem, sizeof(*dmem));