Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
---
include/linux/amba/bus.h | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index e192962..a9fab83 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
--
1.7.4.4
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