1 files changed, 33 insertions, 0 deletions

diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index e1929620e5a8..a9fab831caf8 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -92,4 +92,37 @@ void amba_release_regions(struct amba_device *);
 #define amba_manf(d)    AMBA_MANF_BITS((d)->periphid)
 #define amba_part(d)    AMBA_PART_BITS((d)->periphid)
 
+#define __AMBA_DEV(busid, data, mask)                           \
+        {                                                       \
+                .coherent_dma_mask = mask,                      \
+                .init_name = busid,                             \
+                .platform_data = data,                          \
+        }
+
+/*
+ * APB devices do not themselves have the ability to address memory,
+ * so DMA masks should be zero (much like USB peripheral devices.)
+ * The DMA controller DMA masks should be used instead (much like
+ * USB host controllers in conventional PCs.)
+ */
+#define AMBA_APB_DEVICE(name, busid, id, base, irqs, data)      \
+struct amba_device name##_device = {                            \
+        .dev = __AMBA_DEV(busid, data, 0),                      \
+        .res = DEFINE_RES_MEM(base, SZ_4K),                     \
+        .irq = irqs,                                            \
+        .periphid = id,                                         \
+}
+
+/*
+ * AHB devices are DMA capable, so set their DMA masks
+ */
+#define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data)      \
+struct amba_device name##_device = {                            \
+        .dev = __AMBA_DEV(busid, data, ~0ULL),                  \
+        .res = DEFINE_RES_MEM(base, SZ_4K),                     \
+        .dma_mask = ~0ULL,                                      \
+        .irq = irqs,                                            \
+        .periphid = id,                                         \
+}
+
 #endif