ide: use ide_build_sglist() and ide_destroy_dmatable() in non-PCI host drivers

* Make ide_build_sglist() and ide_destroy_dmatable() available also when
  CONFIG_BLK_DEV_IDEDMA_PCI=n.

* Use ide_build_sglist() and ide_destroy_dmatable() in {ics,au1xxx-}ide.c
  and remove no longer needed {ics,au}ide_build_sglist().

There should be no functionality changes caused by this patch.

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/arm/icside.c

@@ -204,22 +204,6 @@ static void icside_maskproc(ide_drive_t *drive, int mask)
  * interfaces use the same IRQ, which should guarantee this.
  */
 
-static void icside_build_sglist(ide_drive_t *drive, struct request *rq)
-{
-	ide_hwif_t *hwif = drive->hwif;
-	struct scatterlist *sg = hwif->sg_table;
-
-	ide_map_sg(drive, rq);
-
-	if (rq_data_dir(rq) == READ)
-		hwif->sg_dma_direction = DMA_FROM_DEVICE;
-	else
-		hwif->sg_dma_direction = DMA_TO_DEVICE;
-
-	hwif->sg_nents = dma_map_sg(hwif->dev, sg, hwif->sg_nents,
-				    hwif->sg_dma_direction);
-}
-
 /*
  * Configure the IOMD to give the appropriate timings for the transfer
  * mode being requested.  We take the advice of the ATA standards, and
@@ -298,8 +282,7 @@ static int icside_dma_end(ide_drive_t *drive)
 	disable_dma(ec->dma);
 
 	/* Teardown mappings after DMA has completed. */
-	dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents,
-		     hwif->sg_dma_direction);
+	ide_destroy_dmatable(drive);
 
 	return get_dma_residue(ec->dma) != 0;
 }
@@ -331,7 +314,7 @@ static int icside_dma_setup(ide_drive_t *drive)
 	 */
 	BUG_ON(dma_channel_active(ec->dma));
 
-	icside_build_sglist(drive, rq);
+	hwif->sg_nents = ide_build_sglist(drive, rq);
 
 	/*
 	 * Ensure that we have the right interrupt routed.

drivers/ide/ide-dma.c

@@ -170,7 +170,6 @@ static int ide_dma_good_drive(ide_drive_t *drive)
 	return ide_in_drive_list(drive->id, drive_whitelist);
 }
 
-#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
 /**
  *	ide_build_sglist	-	map IDE scatter gather for DMA I/O
  *	@drive: the drive to build the DMA table for
@@ -200,6 +199,7 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
 
 EXPORT_SYMBOL_GPL(ide_build_sglist);
 
+#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
 /**
  *	ide_build_dmatable	-	build IDE DMA table
  *
@@ -294,6 +294,7 @@ use_pio_instead:
 }
 
 EXPORT_SYMBOL_GPL(ide_build_dmatable);
+#endif
 
 /**
  *	ide_destroy_dmatable	-	clean up DMA mapping
@@ -316,6 +317,7 @@ void ide_destroy_dmatable (ide_drive_t *drive)
 
 EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
 
+#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
 /**
  *	config_drive_for_dma	-	attempt to activate IDE DMA
  *	@drive: the drive to place in DMA mode

drivers/ide/mips/au1xxx-ide.c

@@ -209,23 +209,6 @@ static void auide_set_dma_mode(ide_drive_t *drive, const u8 speed)
  */
 
 #ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
-
-static int auide_build_sglist(ide_drive_t *drive,  struct request *rq)
-{
-	ide_hwif_t *hwif = drive->hwif;
-	struct scatterlist *sg = hwif->sg_table;
-
-	ide_map_sg(drive, rq);
-
-	if (rq_data_dir(rq) == READ)
-		hwif->sg_dma_direction = DMA_FROM_DEVICE;
-	else
-		hwif->sg_dma_direction = DMA_TO_DEVICE;
-
-	return dma_map_sg(hwif->dev, sg, hwif->sg_nents,
-			  hwif->sg_dma_direction);
-}
-
 static int auide_build_dmatable(ide_drive_t *drive)
 {
 	int i, iswrite, count = 0;
@@ -240,8 +223,7 @@ static int auide_build_dmatable(ide_drive_t *drive)
 	/* Save for interrupt context */
 	ahwif->drive = drive;
 
-	/* Build sglist */
-	hwif->sg_nents = i = auide_build_sglist(drive, rq);
+	hwif->sg_nents = i = ide_build_sglist(drive, rq);
 
 	if (!i)
 		return 0;
@@ -299,10 +281,7 @@ static int auide_build_dmatable(ide_drive_t *drive)
 		return 1;
 
  use_pio_instead:
-	dma_unmap_sg(hwif->dev,
-		     hwif->sg_table,
-		     hwif->sg_nents,
-		     hwif->sg_dma_direction);
+	ide_destroy_dmatable(drive);
 
 	return 0; /* revert to PIO for this request */
 }
@@ -312,8 +291,7 @@ static int auide_dma_end(ide_drive_t *drive)
 	ide_hwif_t *hwif = HWIF(drive);
 
 	if (hwif->sg_nents) {
-		dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents,
-			     hwif->sg_dma_direction);
+		ide_destroy_dmatable(drive);
 		hwif->sg_nents = 0;
 	}
 

include/linux/ide.h

@@ -1155,10 +1155,11 @@ void ide_dma_on(ide_drive_t *);
 int ide_set_dma(ide_drive_t *);
 ide_startstop_t ide_dma_intr(ide_drive_t *);
 
+int ide_build_sglist(ide_drive_t *, struct request *);
+void ide_destroy_dmatable(ide_drive_t *);
+
 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
-extern int ide_build_sglist(ide_drive_t *, struct request *);
 extern int ide_build_dmatable(ide_drive_t *, struct request *);
-extern void ide_destroy_dmatable(ide_drive_t *);
 extern int ide_release_dma(ide_hwif_t *);
 extern void ide_setup_dma(ide_hwif_t *, unsigned long);