ASoC: kirkwood: move calculation of max buffer size to kirkwood.h

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/kirkwood/kirkwood.h b/sound/soc/kirkwood/kirkwood.h
index 1d13dee..f8e1ccc 100644
--- a/sound/soc/kirkwood/kirkwood.h
+++ b/sound/soc/kirkwood/kirkwood.h
@@ -125,6 +125,8 @@
 #define KIRKWOOD_SND_MAX_PERIODS		16
 #define KIRKWOOD_SND_MIN_PERIOD_BYTES		0x4000
 #define KIRKWOOD_SND_MAX_PERIOD_BYTES		0x4000
+#define KIRKWOOD_SND_MAX_BUFFER_BYTES		(KIRKWOOD_SND_MAX_PERIOD_BYTES \
+						 * KIRKWOOD_SND_MAX_PERIODS)
 
 struct kirkwood_dma_data {
 	void __iomem *io;