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scsi: Add dma direction member to command structure

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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@ti.com>
This commit is contained in:
Faiz Abbas 2019-10-15 18:24:35 +05:30 committed by Tom Rini
parent d48f00ed11
commit 8fbac8e23e
2 changed files with 7 additions and 0 deletions
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4
drivers/scsi/scsi.c
View File

@ -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) {

3
include/scsi.h
View File

@ -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;
};
/*-----------------------------------------------------------