ARM: amba: provide common initializers for static amba devices

Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

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