tile PCI RC: make default consistent DMA mask 32-bit

[cascardo/linux.git] / arch / tile / include / asm / dma-mapping.h

diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index f2ff191..1eae359 100644 (file)
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h
@@ -20,9 +20,14 @@
 #include <linux/cache.h>
 #include <linux/io.h>
 
+#ifdef __tilegx__
+#define ARCH_HAS_DMA_GET_REQUIRED_MASK
+#endif
+
 extern struct dma_map_ops *tile_dma_map_ops;
 extern struct dma_map_ops *gx_pci_dma_map_ops;
 extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
+extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
 
 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 {
@@ -44,12 +49,12 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t off)
 
 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-       return paddr + get_dma_offset(dev);
+       return paddr;
 }
 
 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
-       return daddr - get_dma_offset(dev);
+       return daddr;
 }
 
 static inline void dma_mark_clean(void *addr, size_t size) {}
@@ -87,11 +92,19 @@ dma_set_mask(struct device *dev, u64 mask)
 {
        struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-       /* Handle legacy PCI devices with limited memory addressability. */
-       if ((dma_ops == gx_pci_dma_map_ops) && (mask <= DMA_BIT_MASK(32))) {
-               set_dma_ops(dev, gx_legacy_pci_dma_map_ops);
-               set_dma_offset(dev, 0);
-               if (mask > dev->archdata.max_direct_dma_addr)
+       /*
+        * For PCI devices with 64-bit DMA addressing capability, promote
+        * the dma_ops to hybrid, with the consistent memory DMA space limited
+        * to 32-bit. For 32-bit capable devices, limit the streaming DMA
+        * address range to max_direct_dma_addr.
+        */
+       if (dma_ops == gx_pci_dma_map_ops ||
+           dma_ops == gx_hybrid_pci_dma_map_ops ||
+           dma_ops == gx_legacy_pci_dma_map_ops) {
+               if (mask == DMA_BIT_MASK(64) &&
+                   dma_ops == gx_legacy_pci_dma_map_ops)
+                       set_dma_ops(dev, gx_hybrid_pci_dma_map_ops);
+               else if (mask > dev->archdata.max_direct_dma_addr)
                        mask = dev->archdata.max_direct_dma_addr;
        }