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authorMichael Ellerman <michael@ellerman.id.au>2008-01-21 16:42:43 +1100
committerPaul Mackerras <paulus@samba.org>2008-01-25 22:52:54 +1100
commit35e4a6e26d0c6bc7f32087db61f0fb3666531183 (patch)
tree5ff6c3e0067e0cdfbbae9c6d8c18370070ac0639 /arch
parent450d87eaeb4d43bd9e1f9523a6a3bfeb48209fea (diff)
[POWERPC] Use archdata.dma_data in dma_direct_ops and add the offset
Now that all platforms using dma_direct_offset setup the archdata.dma_data correctly, we can change the dma_direct_ops to retrieve the offset from the dma_data, rather than directly from the global. While we're here, change the way the offset is used - instead of or'ing it into the value, add it. This should have no effect on current implementations where the offset is far larger than memory, however in future we may want to use smaller offsets. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/dma_64.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c
index 14206e3f081..a2d076d005c 100644
--- a/arch/powerpc/kernel/dma_64.c
+++ b/arch/powerpc/kernel/dma_64.c
@@ -117,6 +117,11 @@ EXPORT_SYMBOL(dma_iommu_ops);
*/
unsigned long dma_direct_offset;
+static unsigned long get_dma_direct_offset(struct device *dev)
+{
+ return (unsigned long)dev->archdata.dma_data;
+}
+
static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
@@ -130,7 +135,7 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
return NULL;
ret = page_address(page);
memset(ret, 0, size);
- *dma_handle = virt_to_abs(ret) | dma_direct_offset;
+ *dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev);
return ret;
}
@@ -145,7 +150,7 @@ static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr,
size_t size,
enum dma_data_direction direction)
{
- return virt_to_abs(ptr) | dma_direct_offset;
+ return virt_to_abs(ptr) + get_dma_direct_offset(dev);
}
static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr,
@@ -161,7 +166,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
int i;
for_each_sg(sgl, sg, nents, i) {
- sg->dma_address = sg_phys(sg) | dma_direct_offset;
+ sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev);
sg->dma_length = sg->length;
}