scsi: Add dma direction member to command structure

Some SCSI devices like UFS use DMA for executing scsi commands and hence
need to know the direction of transfer of the dma. Add a dma_dir element
to the command structure to facilitate this.
Signed-off-by: NFaiz Abbas <faiz_abbas@ti.com>

drivers/scsi/scsi.c

@@ -169,6 +169,7 @@ static ulong scsi_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 	      block_dev->devnum, start, blks, (unsigned long)buffer);
 	do {
 		pccb->pdata = (unsigned char *)buf_addr;
+		pccb->dma_dir = DMA_FROM_DEVICE;
 #ifdef CONFIG_SYS_64BIT_LBA
 		if (start > SCSI_LBA48_READ) {
 			unsigned long blocks;
@@ -237,6 +238,7 @@ static ulong scsi_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 	      __func__, block_dev->devnum, start, blks, (unsigned long)buffer);
 	do {
 		pccb->pdata = (unsigned char *)buf_addr;
+		pccb->dma_dir = DMA_TO_DEVICE;
 		if (blks > max_blks) {
 			pccb->datalen = block_dev->blksz * max_blks;
 			smallblks = max_blks;
@@ -385,6 +387,7 @@ static int scsi_read_capacity(struct udevice *dev, struct scsi_cmd *pccb,
 	pccb->msgout[0] = SCSI_IDENTIFY; /* NOT USED */
 
 	pccb->datalen = 16;
+	pccb->dma_dir = DMA_FROM_DEVICE;
 	if (scsi_exec(dev, pccb))
 		return 1;
 
@@ -487,6 +490,7 @@ static int scsi_detect_dev(struct udevice *dev, int target, int lun,
 	pccb->lun = lun;
 	pccb->pdata = (unsigned char *)&tempbuff;
 	pccb->datalen = 512;
+	pccb->dma_dir = DMA_FROM_DEVICE;
 	scsi_setup_inquiry(pccb);
 	if (scsi_exec(dev, pccb)) {
 		if (pccb->contr_stat == SCSI_SEL_TIME_OUT) {

include/scsi.h

@@ -6,6 +6,8 @@
  #ifndef _SCSI_H
  #define _SCSI_H
 
+#include <linux/dma-direction.h>
+
 struct scsi_cmd {
 	unsigned char		cmd[16];					/* command				   */
 	/* for request sense */
@@ -26,6 +28,7 @@ struct scsi_cmd {
 	unsigned long		trans_bytes;			/* tranfered bytes		*/
 
 	unsigned int		priv;
+	enum dma_data_direction	dma_dir;
 };
 
 /*-----------------------------------------------------------