ASoC: rsnd: add common DMAEngine method

R-Car Sound driver will support DMA transfer in the future,
then, SSI/SRU/SRC will use it.
Current R-Car can't use soc-dmaengine-pcm.c since its DMAEngine
doesn't support dmaengine_prep_dma_cyclic(),
and SSI needs double plane transfer (which needs special submit) on DMAC.
This patch adds common DMAEngine method for it

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 9243e387104c..15dccd598960 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -13,9 +13,12 @@
 
 #include <linux/clk.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/sh_dma.h>
+#include <linux/workqueue.h>
 #include <sound/rcar_snd.h>
 #include <sound/soc.h>
 #include <sound/pcm_params.h>
@@ -79,6 +82,32 @@ void rsnd_bset(struct rsnd_priv *priv, struct rsnd_mod *mod, enum rsnd_reg reg,
                     u32 mask, u32 data);
 
 /*
+ *      R-Car DMA
+ */
+struct rsnd_dma {
+        struct rsnd_priv        *priv;
+        struct sh_dmae_slave    slave;
+        struct work_struct      work;
+        struct dma_chan         *chan;
+        enum dma_data_direction dir;
+        int (*inquiry)(struct rsnd_dma *dma, dma_addr_t *buf, int *len);
+        int (*complete)(struct rsnd_dma *dma);
+
+        int submit_loop;
+};
+
+void rsnd_dma_start(struct rsnd_dma *dma);
+void rsnd_dma_stop(struct rsnd_dma *dma);
+int rsnd_dma_available(struct rsnd_dma *dma);
+int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma,
+        int is_play, int id,
+        int (*inquiry)(struct rsnd_dma *dma, dma_addr_t *buf, int *len),
+        int (*complete)(struct rsnd_dma *dma));
+void  rsnd_dma_quit(struct rsnd_priv *priv,
+                    struct rsnd_dma *dma);
+
+
+/*
  *      R-Car sound mod
  */
 
@@ -103,9 +132,12 @@ struct rsnd_mod {
         struct rsnd_priv *priv;
         struct rsnd_mod_ops *ops;
         struct list_head list; /* connect to rsnd_dai playback/capture */
+        struct rsnd_dma dma;
 };
 
 #define rsnd_mod_to_priv(mod) ((mod)->priv)
+#define rsnd_mod_to_dma(mod) (&(mod)->dma)
+#define rsnd_dma_to_mod(_dma) container_of((_dma), struct rsnd_mod, dma)
 #define rsnd_mod_id(mod) ((mod)->id)
 #define for_each_rsnd_mod(pos, n, io)   \
         list_for_each_entry_safe(pos, n, &(io)->head, list)