From: Will Davis <wdavis@xxxxxxxxxx>
Simply pass through the physical address as the DMA address.
Signed-off-by: Will Davis <wdavis@xxxxxxxxxx>
Reviewed-by: Terence Ripperda <tripperda@xxxxxxxxxx>
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
arch/x86/kernel/pci-nommu.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index da15918..6e9e66d 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -38,6 +38,22 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
return bus;
}
+static dma_addr_t nommu_map_resource(struct device *dev, struct resource *res,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ dma_addr_t bus = res->start + offset;
+
+ WARN_ON(size == 0);
+
+ if (!check_addr("map_resource", dev, bus, size))
+ return DMA_ERROR_CODE;
+ flush_write_buffers();
+ return bus;
+}
+
+
/* Map a set of buffers described by scatterlist in streaming
* mode for DMA. This is the scatter-gather version of the
* above pci_map_single interface. Here the scatter gather list
@@ -93,6 +109,7 @@ struct dma_map_ops nommu_dma_ops = {
.free = dma_generic_free_coherent,
.map_sg = nommu_map_sg,
.map_page = nommu_map_page,
+ .map_resource = nommu_map_resource,
.sync_single_for_device = nommu_sync_single_for_device,
.sync_sg_for_device = nommu_sync_sg_for_device,
.is_phys = 1,
--
2.3.7
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
