/*
* Load an ISA DMA map with a linear buffer.
*/
int
isadma_bounce_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
struct isadma_bounce_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;
/*
* Try to load the map the normal way. If this errors out,
* and we can bounce, we will.
*/
error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
if (error == 0 ||
(error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0))
return (error);
/*
* First attempt failed; bounce it.
*/
/*
* Allocate bounce pages, if necessary.
*/
if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
error = isadma_bounce_alloc_bouncebuf(t, map, buflen, flags);
if (error)
return (error);
}
/*
* Cache a pointer to the caller's buffer and load the DMA map
* with the bounce buffer.
*/
cookie->id_origbuf = buf;
cookie->id_origbuflen = buflen;
cookie->id_buftype = ID_BUFTYPE_LINEAR;
error = _bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen,
p, flags);
if (error) {
/*
* Free the bounce pages, unless our resources
* are reserved for our exclusive use.
*/
if ((map->_dm_flags & BUS_DMA_ALLOCNOW) == 0)
isadma_bounce_free_bouncebuf(t, map);
return (error);
}
/* ...so isadma_bounce_dmamap_sync() knows we're bouncing */
cookie->id_flags |= ID_IS_BOUNCING;
return (0);
}
static int
vme_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
int error;
error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
if (error == 0)
map->dm_segs[0].ds_addr &= DVMA_VME_SLAVE_MASK;
return error;
}
/*
* function for loading a direct-mapped DMA map with a linear buffer.
*/
int
jazz_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
int error;
if ((map->_dm_flags & BUS_DMA_ALLOCNOW) != 0) {
/* just use pre-allocated DMA TLB for the buffer */
jazz_tlbmap_t tlbmap;
bus_size_t off;
struct vmspace *vm;
if (p != NULL) {
vm = p->p_vmspace;
} else {
vm = vmspace_kernel();
}
tlbmap = (jazz_tlbmap_t)map->_dm_cookie;
off = jazz_dma_page_offs(buf);
jazz_dmatlb_map_va(vm, (vaddr_t)buf, buflen, tlbmap->ptebase);
map->dm_segs[0].ds_addr = tlbmap->vaddr + off;
map->dm_segs[0].ds_len = buflen;
map->dm_segs[0]._ds_vaddr = (vaddr_t)buf;
map->dm_mapsize = buflen;
map->dm_nsegs = 1;
map->_dm_vmspace = vm;
if (buf >= (void *)MIPS_KSEG1_START &&
buf < (void *)MIPS_KSEG2_START)
map->_dm_flags |= ARC_DMAMAP_COHERENT;
return 0;
}
error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
if (error == 0) {
/* allocate DMA TLB for each dmamap segment */
error = jazz_bus_dmamap_alloc_sgmap(t, map->dm_segs,
map->dm_nsegs, map->_dm_boundary, flags);
}
return error;
}
/*
* Like isadma_bounce_dmamap_load(), but for mbufs.
*/
int
isadma_bounce_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map,
struct mbuf *m0, int flags)
{
struct isadma_bounce_cookie *cookie = map->_dm_cookie;
int error;
/*
* Make sure 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("isadma_bounce_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
/*
* Try to load the map the normal way. If this errors out,
* and we can bounce, we will.
*/
error = _bus_dmamap_load_mbuf(t, map, m0, flags);
if (error == 0 ||
(error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0))
return (error);
/*
* First attempt failed; bounce it.
*/
/*
* Allocate bounce pages, if necessary.
*/
if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
error = isadma_bounce_alloc_bouncebuf(t, map, m0->m_pkthdr.len,
flags);
if (error)
return (error);
}
/*
* Cache a pointer to the caller's buffer and load the DMA map
* with the bounce buffer.
*/
cookie->id_origbuf = m0;
cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */
cookie->id_buftype = ID_BUFTYPE_MBUF;
error = _bus_dmamap_load(t, map, cookie->id_bouncebuf,
m0->m_pkthdr.len, NULL, flags);
if (error) {
/*
* Free the bounce pages, unless our resources
* are reserved for our exclusive use.
*/
if ((map->_dm_flags & BUS_DMA_ALLOCNOW) == 0)
isadma_bounce_free_bouncebuf(t, map);
return (error);
}
/* ...so isadma_bounce_dmamap_sync() knows we're bouncing */
cookie->id_flags |= ID_IS_BOUNCING;
return (0);
}
/*
* Load an ISA DMA map with a linear buffer.
*/
int
_isa_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map,
void *buf, bus_size_t buflen,
struct proc *p, int flags)
{
struct i386_isa_dma_cookie *cookie = map->_dm_cookie;
int error;
STAT_INCR(isa_dma_stats_loads);
/*
* Check to see if we might need to bounce the transfer.
*/
if (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) {
/*
* Check if all pages are below the bounce
* threshold. If they are, don't bother bouncing.
*/
if (_isa_dma_check_buffer(buf, buflen,
map->_dm_segcnt, map->_dm_boundary, p) == 0)
return (_bus_dmamap_load(t, map, buf, buflen,
p, flags));
STAT_INCR(isa_dma_stats_bounces);
/*
* Allocate bounce pages, if necessary.
*/
if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
error = _isa_dma_alloc_bouncebuf(t, map, buflen,
flags);
if (error)
return (error);
}
/*
* Cache a pointer to the caller's buffer and
* load the DMA map with the bounce buffer.
*/
cookie->id_origbuf = buf;
cookie->id_origbuflen = buflen;
error = _bus_dmamap_load(t, map, cookie->id_bouncebuf,
buflen, p, flags);
if (error) {
/*
* Free the bounce pages, unless our resources
* are reserved for our exclusive use.
*/
if ((map->_dm_flags & BUS_DMA_ALLOCNOW) == 0)
_isa_dma_free_bouncebuf(t, map);
}
/* ...so _isa_bus_dmamap_sync() knows we're bouncing */
cookie->id_flags |= ID_IS_BOUNCING;
} else {
/*
* Just use the generic load function.
*/
error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
}
return (error);
}
