NetBSD-5.0.2/sys/arch/rs6000/mca/mcadma_machdep.c
/* $NetBSD: mcadma_machdep.c,v 1.2 2008/04/28 20:23:34 martin Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tim Rightnour
*
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mcadma_machdep.c,v 1.2 2008/04/28 20:23:34 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#define _POWERPC_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/pio.h>
#include <dev/mca/mcavar.h>
#include <dev/mca/mcareg.h>
struct rs6000_dma_cookie {
int id_flags;
uint32_t bid; /* the BID of this IOCC */
uint32_t tce_off; /* offset of the TCE */
uint32_t nroftce;
uint32_t nrofslaves; /* nrof slave channels */
uint32_t slave_regs; /* allocation bitmask */
uint32_t dma_regs; /* allocation bitmask */
};
/*
* Entry points for MCA DMA. These are mostly wrappers around
* the generic functions that understand how to deal with bounce
* buffers, if necessary.
*/
struct powerpc_bus_dma_tag mca_bus_dma_tag = {
0, /* _bounce_thresh */
_mca_bus_dmamap_create,
_bus_dmamap_destroy,
_bus_dmamap_load,
_bus_dmamap_load_mbuf,
_bus_dmamap_load_uio,
_bus_dmamap_load_raw,
_bus_dmamap_unload,
NULL, /* _dmamap_sync */
_bus_dmamem_alloc,
_bus_dmamem_free,
_bus_dmamem_map,
_bus_dmamem_unmap,
_bus_dmamem_mmap,
};
/*
* Allocate a DMA map, and set up DMA channel.
*/
static int
_mca_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int flags,
bus_dmamap_t *dmamp, int dmach)
{
int error;
struct rs6000_dma_cookie *cookie;
#ifdef DEBUG
/* Sanity check */
if (dmach < 0 || dmach >= MAX_DMA_CHANNELS) {
printf("mcadma_create: invalid DMA channel %d\n", dmach);
return EINVAL;
}
if (size > 65536) {
panic("mca_dmamap_create: dmamap sz %ld > 65536", (long) size);
}
#endif
/*
* MCA DMA transfer can be maximum 65536 bytes long and must
* be in one chunk. No specific boundary constraints are present.
*/
if ((error = _bus_dmamap_create(t, size, 1, 65536, 0, flags, dmamp)))
return error;
cookie = (struct rs6000_dma_cookie *) (*dmamp)->_dm_cookie;
if (cookie == NULL) {
/*
* Allocate our cookie if not yet done.
*/
cookie = malloc(sizeof(struct rs6000_dma_cookie), M_DMAMAP,
((flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK) | M_ZERO);
if (cookie == NULL) {
return ENOMEM;
}
(*dmamp)->_dm_cookie = cookie;
}
/* Encode DMA channel */
cookie->id_flags &= 0x0f;
cookie->id_flags |= dmach << 4;
/* Mark the dmamap as using DMA controller. Some devices
* drive DMA themselves, and don't need the MCA DMA controller.
* To distinguish the two, use a flag for dmamaps which use the DMA
* controller.
*/
(*dmamp)->_dm_flags |= _MCABUS_DMA_USEDMACTRL;
return 0;
}
static void
_mca_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map)
{
struct rs6000_dma_cookie *cookie = map->_dm_cookie;
free(cookie, M_DMAMAP);
_bus_dmamap_destroy(t, map);
}
/*
* Load an MCA DMA map with a linear buffer.
*/
static int
_mca_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
struct rs6000_dma_cookie *cookie = map->_dm_cookie;
int error;
/* Make sure that on error condition we return "no valid mappings." */
map->dm_mapsize = 0;
map->dm_nsegs = 0;
error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
return error;
}
/*
* Like _mca_bus_dmamap_load(), but for mbufs.
*/
static int
_mca_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0,
int flags)
{
struct rs6000_dma_cookie *cookie = map->_dm_cookie;
int error;
/* Make sure that on error condition we return "no valid mappings." */
map->dm_mapsize = 0;
map->dm_nsegs = 0;
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_mca_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return EINVAL;
error = _bus_dmamap_load_mbuf(t, map, m0, flags);
return error;
}
/*
* Like _mca_bus_dmamap_load(), but for uios.
*/
static int
_mca_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio,
int flags)
{
panic("_mca_bus_dmamap_load_uio: not implemented");
}
/*
* Like _mca_bus_dmamap_load(), but for raw memory allocated with
* bus_dmamem_alloc().
*/
static int
_mca_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map,
bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
{
panic("_mca_bus_dmamap_load_raw: not implemented");
}
/*
* Unload an MCA DMA map.
*/
static void
_mca_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map)
{
_bus_dmamap_unload(t, map);
}
/*
* Allocate memory safe for MCA DMA.
*/
static int
_mca_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment,
bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs,
int flags)
{
paddr_t high;
high = trunc_page(avail_end);
return _bus_dmamem_alloc_range(t, size, alignment, boundary,
segs, nsegs, rsegs, flags, 0, high);
}