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Implement bus_dmamap_load(9) and bus_dmamap_unload(9) for sun3x.

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This commit is contained in:
tsutsui 2007-02-03 05:13:58 +00:00
parent d60f1f435f
commit 2fce94aa7d
1 changed files with 91 additions and 4 deletions
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95
sys/arch/sun3/sun3x/dvma.c
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@ -1,4 +1,4 @@
/* $NetBSD: dvma.c,v 1.32 2007/02/02 15:50:58 tsutsui Exp $ */
/* $NetBSD: dvma.c,v 1.33 2007/02/03 05:13:58 tsutsui Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
@ -76,7 +76,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dvma.c,v 1.32 2007/02/02 15:50:58 tsutsui Exp $");
__KERNEL_RCSID(0, "$NetBSD: dvma.c,v 1.33 2007/02/03 05:13:58 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -307,13 +307,100 @@ int
_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
vaddr_t kva, dva;
vsize_t off, sgsize;
paddr_t pa;
pmap_t pmap;
int error, rv, s;
panic("_bus_dmamap_load(): not implemented yet.");
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_nsegs = 0;
map->dm_mapsize = 0;
if (buflen > map->_dm_size)
return EINVAL;
kva = (vaddr_t)buf;
off = kva & PGOFSET;
sgsize = round_page(off + buflen);
/* Try to allocate DVMA space. */
s = splvm();
error = extent_alloc(dvma_extent, sgsize, PAGE_SIZE, 0,
EX_FAST | ((flags & BUS_DMA_NOWAIT) == 0 ? EX_WAITOK : EX_NOWAIT),
&dva);
splx(s);
if (error)
return ENOMEM;
/* Fill in the segment. */
map->dm_segs[0].ds_addr = dva + off;
map->dm_segs[0].ds_len = buflen;
map->dm_segs[0]._ds_va = dva;
map->dm_segs[0]._ds_sgsize = sgsize;
/*
* Now map the DVMA addresses we allocated to point to the
* pages of the caller's buffer.
*/
if (p != NULL)
pmap = p->p_vmspace->vm_map.pmap;
else
pmap = pmap_kernel();
while (sgsize > 0) {
rv = pmap_extract(pmap, kva, &pa);
#ifdef DIAGNOSTIC
if (rv == FALSE)
panic("%s: unmapped VA", __func__);
#endif
iommu_enter((dva & IOMMU_VA_MASK), pa);
pmap_kenter_pa(dva, pa | PMAP_NC, VM_PROT_READ | VM_PROT_WRITE);
kva += PAGE_SIZE;
dva += PAGE_SIZE;
sgsize -= PAGE_SIZE;
}
map->dm_nsegs = 1;
map->dm_mapsize = map->dm_segs[0].ds_len;
return 0;
}
void
_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map)
{
bus_dma_segment_t *segs;
vaddr_t dva;
vsize_t sgsize;
int error, s;
panic("_bus_dmamap_unload(): not implemented yet.");
#ifdef DIAGNOSTIC
if (map->dm_nsegs != 1)
panic("%s: invalid nsegs = %d", __func__, nsegs);
#endif
segs = map->dm_segs;
dva = segs[0]._ds_va & ~PGOFSET;
sgsize = segs[0]._ds_sgsize;
/* Unmap the DVMA addresses. */
iommu_remove((dva & IOMMU_VA_MASK), sgsize);
pmap_kremove(dva, sgsize);
pmap_update(pmap_kernel());
/* Free the DVMA addresses. */
s = splvm();
error = extent_free(dvma_extent, dva, sgsize, EX_NOWAIT);
splx(s);
#ifdef DIAGNOSTIC
if (error)
panic("%s: unable to free DVMA region", __func__);
#endif
/* Mark the mappings as invalid. */
map->dm_mapsize = 0;
map->dm_nsegs = 0;
}