1 files changed, 47 insertions, 0 deletions

diff --git a/include/linux/rio.h b/include/linux/rio.h
index 4d50611112ba..a90ebadd9da0 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -20,6 +20,9 @@
 #include <linux/errno.h>
 #include <linux/device.h>
 #include <linux/rio_regs.h>
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+#include <linux/dmaengine.h>
+#endif
 
 #define RIO_NO_HOPCOUNT         -1
 #define RIO_INVALID_DESTID      0xffff
@@ -254,6 +257,9 @@ struct rio_mport {
         u32 phys_efptr;
         unsigned char name[40];
         void *priv;             /* Master port private data */
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+        struct dma_device       dma;
+#endif
 };
 
 /**
@@ -395,6 +401,47 @@ union rio_pw_msg {
         u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
 };
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+
+/**
+ * enum rio_write_type - RIO write transaction types used in DMA transfers
+ *
+ * Note: RapidIO specification defines write (NWRITE) and
+ * write-with-response (NWRITE_R) data transfer operations.
+ * Existing DMA controllers that service RapidIO may use one of these operations
+ * for entire data transfer or their combination with only the last data packet
+ * requires response.
+ */
+enum rio_write_type {
+        RDW_DEFAULT,            /* default method used by DMA driver */
+        RDW_ALL_NWRITE,         /* all packets use NWRITE */
+        RDW_ALL_NWRITE_R,       /* all packets use NWRITE_R */
+        RDW_LAST_NWRITE_R,      /* last packet uses NWRITE_R, others - NWRITE */
+};
+
+struct rio_dma_ext {
+        u16 destid;
+        u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
+        u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
+        enum rio_write_type wr_type; /* preferred RIO write operation type */
+};
+
+struct rio_dma_data {
+        /* Local data (as scatterlist) */
+        struct scatterlist      *sg;    /* I/O scatter list */
+        unsigned int            sg_len; /* size of scatter list */
+        /* Remote device address (flat buffer) */
+        u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
+        u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
+        enum rio_write_type wr_type; /* preferred RIO write operation type */
+};
+
+static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
+{
+        return container_of(ddev, struct rio_mport, dma);
+}
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
 /* Architecture and hardware-specific functions */
 extern int rio_register_mport(struct rio_mport *);
 extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);