mmc: dw_mmc: Add external dma interface support

DesignWare MMC Controller can supports two types of DMA
mode: external dma and internal dma. We get a RK312x platform
integrated dw_mmc and ARM pl330 dma controller. This patch add
edmac ops to support these platforms. I've tested it on RK31xx
platform with edmac mode and RK3288 platform with idmac mode.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 21 insertions, 2 deletions

diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index 134c57422740..f67b2ec18e6d 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -16,6 +16,7 @@
 
 #include <linux/scatterlist.h>
 #include <linux/mmc/core.h>
+#include <linux/dmaengine.h>
 
 #define MAX_MCI_SLOTS   2
 
@@ -40,6 +41,17 @@ enum {
 
 struct mmc_data;
 
+enum {
+        TRANS_MODE_PIO = 0,
+        TRANS_MODE_IDMAC,
+        TRANS_MODE_EDMAC
+};
+
+struct dw_mci_dma_slave {
+        struct dma_chan *ch;
+        enum dma_transfer_direction direction;
+};
+
 /**
  * struct dw_mci - MMC controller state shared between all slots
  * @lock: Spinlock protecting the queue and associated data.
@@ -154,7 +166,14 @@ struct dw_mci {
         dma_addr_t              sg_dma;
         void                    *sg_cpu;
         const struct dw_mci_dma_ops     *dma_ops;
+        /* For idmac */
         unsigned int            ring_size;
+
+        /* For edmac */
+        struct dw_mci_dma_slave *dms;
+        /* Registers's physical base address */
+        void                    *phy_regs;
+
         u32                     cmd_status;
         u32                     data_status;
         u32                     stop_cmdr;
@@ -208,8 +227,8 @@ struct dw_mci {
 struct dw_mci_dma_ops {
         /* DMA Ops */
         int (*init)(struct dw_mci *host);
-        void (*start)(struct dw_mci *host, unsigned int sg_len);
-        void (*complete)(struct dw_mci *host);
+        int (*start)(struct dw_mci *host, unsigned int sg_len);
+        void (*complete)(void *host);
         void (*stop)(struct dw_mci *host);
         void (*cleanup)(struct dw_mci *host);
         void (*exit)(struct dw_mci *host);