sf: Add quad read/write commands support

This patch add quad commands support like
- QUAD_PAGE_PROGRAM => for write program
- QUAD_OUTPUT_FAST ->> for read program

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/include/spi.h b/include/spi.h
index 31195a3..5dd490a 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -31,11 +31,16 @@
 #define SPI_XFER_MMAP_END	0x10	/* Memory Mapped End */
 #define SPI_XFER_ONCE		(SPI_XFER_BEGIN | SPI_XFER_END)
 
+/* SPI TX operation modes */
+#define SPI_OPM_TX_QPP		1 << 0
+
 /* SPI RX operation modes */
 #define SPI_OPM_RX_AS		1 << 0
 #define SPI_OPM_RX_DOUT		1 << 1
 #define SPI_OPM_RX_DIO		1 << 2
-#define SPI_OPM_RX_EXTN		SPI_OPM_RX_AS | SPI_OPM_RX_DOUT | SPI_OPM_RX_DIO
+#define SPI_OPM_RX_QOF		1 << 3
+#define SPI_OPM_RX_EXTN		SPI_OPM_RX_AS | SPI_OPM_RX_DOUT | \
+				SPI_OPM_RX_DIO | SPI_OPM_RX_QOF
 
 /* Header byte that marks the start of the message */
 #define SPI_PREAMBLE_END_BYTE	0xec
@@ -50,6 +55,7 @@
  * @bus:		ID of the bus that the slave is attached to.
  * @cs:			ID of the chip select connected to the slave.
  * @op_mode_rx:		SPI RX operation mode.
+ * @op_mode_tx:		SPI TX operation mode.
  * @wordlen:		Size of SPI word in number of bits
  * @max_write_size:	If non-zero, the maximum number of bytes which can
  *			be written at once, excluding command bytes.
@@ -59,6 +65,7 @@
 	unsigned int bus;
 	unsigned int cs;
 	u8 op_mode_rx;
+	u8 op_mode_tx;
 	unsigned int wordlen;
 	unsigned int max_write_size;
 	void *memory_map;