[U-Boot] [PATCH v2 04/11] scsi: Add dma direction member to command structure

[Faiz Abbas]

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: Faiz Abbas <faiz_abbas at ti.com>
---
 drivers/scsi/scsi.c | 4 ++++
 include/scsi.h      | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 1256e22a52..58ee44053a 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -168,6 +168,7 @@ 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;
@@ -236,6 +237,7 @@ 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;
@@ -383,6 +385,7 @@ 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;
 
@@ -485,6 +488,7 @@ 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) {
diff --git a/include/scsi.h b/include/scsi.h
index 963abe2b13..61da958bf6 100644
--- a/include/scsi.h
+++ b/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;
 };
 
 /*-----------------------------------------------------------
-- 
2.19.2