/**
* @file
*
* @ingroup rtems_bsd_rtems
*
* @brief TODO.
*
* File origin from FreeBSD "sys/powerpc/powerpc/busdma_machdep.c".
*/
/*-
* Copyright (c) 2012 embedded brains GmbH.
* All rights reserved.
*
* embedded brains GmbH
* Obere Lagerstr. 30
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* Copyright (c) 1997, 1998 Justin T. Gibbs.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/rtems-bsd-kernel-space.h>
#include <machine/rtems-bsd-bus-dma.h>
#include <sys/mbuf.h>
/*
* Like bus_dmamap_load(), but for mbufs.
*/
int
bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *m0,
bus_dmamap_callback2_t *callback, void *callback_arg,
int flags)
{
bus_dma_segment_t dm_segments[dmat->nsegments];
int nsegs, error;
M_ASSERTPKTHDR(m0);
flags |= BUS_DMA_NOWAIT;
nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = bus_dmamap_load_buffer(dmat, dm_segments,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
&nsegs, first);
first = 0;
}
}
} else {
error = EINVAL;
}
if (error) {
/* force "no valid mappings" in callback */
(*callback)(callback_arg, dm_segments, 0, 0, error);
} else {
(*callback)(callback_arg, dm_segments,
nsegs+1, m0->m_pkthdr.len, error);
}
return (error);
}
int
bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs,
int flags)
{
int error;
M_ASSERTPKTHDR(m0);
flags |= BUS_DMA_NOWAIT;
*nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = bus_dmamap_load_buffer(dmat, segs,
m->m_data, m->m_len,
NULL, flags, &lastaddr,
nsegs, first);
first = 0;
}
}
} else {
error = EINVAL;
}
/* XXX FIXME: Having to increment nsegs is really annoying */
++*nsegs;
return (error);
}
