[POWERPC] Refactor 64 bits DMA operations

This patch completely refactors DMA operations for 64 bits powerpc. 32 bits
is untouched for now.

We use the new dev_archdata structure to add the dma operations pointer
and associated data to struct device. While at it, we also add the OF node
pointer and numa node. In the future, we might want to look into merging
that with pci_dn as well.

The old vio, pci-iommu and pci-direct DMA ops are gone. They are now replaced
by a set of generic iommu and direct DMA ops (non PCI specific) that can be
used by bus types. The toplevel implementation is now inline.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 39db7a3affe1..8e515797de6a 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -112,7 +112,7 @@ static int ibmebus_dma_supported(struct device *dev, u64 mask)
         return 1;
 }
 
-struct dma_mapping_ops ibmebus_dma_ops = {
+static struct dma_mapping_ops ibmebus_dma_ops = {
         .alloc_coherent = ibmebus_alloc_coherent,
         .free_coherent  = ibmebus_free_coherent,
         .map_single     = ibmebus_map_single,
@@ -176,6 +176,10 @@ static struct ibmebus_dev* __devinit ibmebus_register_device_common(
         dev->ofdev.dev.bus     = &ibmebus_bus_type;
         dev->ofdev.dev.release = ibmebus_dev_release;
 
+        dev->ofdev.dev.archdata.of_node = dev->ofdev.node;
+        dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops;
+        dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node);
+
         /* An ibmebusdev is based on a of_device. We have to change the
          * bus type to use our own DMA mapping operations. 
          */