1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index 12caa1292b75..34eb676916fe 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -12,6 +12,35 @@
  */
 
 #include <linux/serial_8250.h>
+#include <linux/dmaengine.h>
+
+struct uart_8250_dma {
+        dma_filter_fn           fn;
+        void                    *rx_param;
+        void                    *tx_param;
+
+        int                     rx_chan_id;
+        int                     tx_chan_id;
+
+        struct dma_slave_config rxconf;
+        struct dma_slave_config txconf;
+
+        struct dma_chan         *rxchan;
+        struct dma_chan         *txchan;
+
+        dma_addr_t              rx_addr;
+        dma_addr_t              tx_addr;
+
+        dma_cookie_t            rx_cookie;
+        dma_cookie_t            tx_cookie;
+
+        void                    *rx_buf;
+
+        size_t                  rx_size;
+        size_t                  tx_size;
+
+        unsigned char           tx_running:1;
+};
 
 struct old_serial_port {
         unsigned int uart;
@@ -143,3 +172,24 @@ static inline int is_omap1510_8250(struct uart_8250_port *pt)
         return 0;
 }
 #endif
+
+#ifdef CONFIG_SERIAL_8250_DMA
+extern int serial8250_tx_dma(struct uart_8250_port *);
+extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir);
+extern int serial8250_request_dma(struct uart_8250_port *);
+extern void serial8250_release_dma(struct uart_8250_port *);
+#else
+static inline int serial8250_tx_dma(struct uart_8250_port *p)
+{
+        return -1;
+}
+static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
+{
+        return -1;
+}
+static inline int serial8250_request_dma(struct uart_8250_port *p)
+{
+        return -1;
+}
+static inline void serial8250_release_dma(struct uart_8250_port *p) { }
+#endif