ide: pass command to ide_map_sg()

* Set IDE_TFLAG_WRITE flag and ->rq also for ATA_CMD_PACKET
  commands.

* Pass command to ->dma_setup method and update all its
  implementations accordingly.

* Pass command instead of request to ide_build_sglist(),
  *_build_dmatable() and ide_map_sg().

While at it:

* Fix scc_dma_setup() documentation + use ATA_DMA_WR define.

* Rename sgiioc4_build_dma_table() to sgiioc4_build_dmatable(),
  change return value type to 'int' and drop unused 'ddir'
  argument.

* Do some minor cleanups in [tx4939]ide_dma_setup().

There should be no functional changes caused by this patch.

Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 7 insertions, 12 deletions

diff --git a/drivers/ide/scc_pata.c b/drivers/ide/scc_pata.c
index ada866744622..1f2805ce9889 100644
--- a/drivers/ide/scc_pata.c
+++ b/drivers/ide/scc_pata.c
@@ -303,8 +303,9 @@ static void scc_dma_host_set(ide_drive_t *drive, int on)
 }
 
 /**
- *      scc_ide_dma_setup       -       begin a DMA phase
+ *      scc_dma_setup   -       begin a DMA phase
  *      @drive: target device
+ *      @cmd: command
  *
  *      Build an IDE DMA PRD (IDE speak for scatter gather table)
  *      and then set up the DMA transfer registers.
@@ -313,21 +314,15 @@ static void scc_dma_host_set(ide_drive_t *drive, int on)
  *      is returned.
  */
 
-static int scc_dma_setup(ide_drive_t *drive)
+static int scc_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
 {
         ide_hwif_t *hwif = drive->hwif;
-        struct request *rq = hwif->rq;
-        unsigned int reading;
+        u32 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
         u8 dma_stat;
 
-        if (rq_data_dir(rq))
-                reading = 0;
-        else
-                reading = 1 << 3;
-
         /* fall back to pio! */
-        if (!ide_build_dmatable(drive, rq)) {
-                ide_map_sg(drive, rq);
+        if (ide_build_dmatable(drive, cmd) == 0) {
+                ide_map_sg(drive, cmd);
                 return 1;
         }
 
@@ -335,7 +330,7 @@ static int scc_dma_setup(ide_drive_t *drive)
         out_be32((void __iomem *)(hwif->dma_base + 8), hwif->dmatable_dma);
 
         /* specify r/w */
-        out_be32((void __iomem *)hwif->dma_base, reading);
+        out_be32((void __iomem *)hwif->dma_base, rw);
 
         /* read DMA status for INTR & ERROR flags */
         dma_stat = scc_dma_sff_read_status(hwif);