X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Farm%2Finclude%2Fasm%2Ftypes.h;h=d108915ff5c1e1accc0f4d80be10921707dea667;hb=ef36d9ae1646e5aee7c1425ee507d275699a072e;hp=ee77c4179f1aa04c24d37944b870c69ddebb13c3;hpb=e536ab8849b2b4f6d68bbc8e1d1f9bc033db06bd;p=oweals%2Fu-boot.git

diff --git a/arch/arm/include/asm/types.h b/arch/arm/include/asm/types.h
index ee77c4179f..d108915ff5 100644
--- a/arch/arm/include/asm/types.h
+++ b/arch/arm/include/asm/types.h
@@ -45,12 +45,29 @@ typedef unsigned long long u64;
 #define BITS_PER_LONG 32
 #endif	/* CONFIG_ARM64 */
 
-/* Dma addresses are 32-bits wide.  */
-
-typedef u32 dma_addr_t;
-
+#ifdef CONFIG_PHYS_64BIT
+typedef unsigned long long phys_addr_t;
+typedef unsigned long long phys_size_t;
+#else
+/* DMA addresses are 32-bits wide */
 typedef unsigned long phys_addr_t;
 typedef unsigned long phys_size_t;
+#endif
+
+/*
+ * A dma_addr_t can hold any valid DMA address, i.e., any address returned
+ * by the DMA API.
+ *
+ * If the DMA API only uses 32-bit addresses, dma_addr_t need only be 32
+ * bits wide.  Bus addresses, e.g., PCI BARs, may be wider than 32 bits,
+ * but drivers do memory-mapped I/O to ioremapped kernel virtual addresses,
+ * so they don't care about the size of the actual bus addresses.
+ */
+#ifdef CONFIG_DMA_ADDR_T_64BIT
+typedef unsigned long long dma_addr_t;
+#else
+typedef u32 dma_addr_t;
+#endif
 
 #endif /* __KERNEL__ */