icside: use ec->dma directly

* hwif->hwif_data contains pointer to struct expansion_card so use ec->dma
  directly instead of caching it in hwif->hw.dma.

* Remove no longer needed hw_regs_t.dma and NO_DMA define.

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

drivers/ide/arm/icside.c

@@ -316,27 +316,29 @@ static int icside_dma_end(ide_drive_t *drive)
 
 	drive->waiting_for_dma = 0;
 
-	disable_dma(hwif->hw.dma);
+	disable_dma(state->dev->dma);
 
 	/* Teardown mappings after DMA has completed. */
 	dma_unmap_sg(state->dev, hwif->sg_table, hwif->sg_nents,
 		     hwif->sg_dma_direction);
 
-	return get_dma_residue(hwif->hw.dma) != 0;
+	return get_dma_residue(state->dev->dma) != 0;
 }
 
 static void icside_dma_start(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = HWIF(drive);
+	struct icside_state *state = hwif->hwif_data;
 
 	/* We can not enable DMA on both channels simultaneously. */
-	BUG_ON(dma_channel_active(hwif->hw.dma));
-	enable_dma(hwif->hw.dma);
+	BUG_ON(dma_channel_active(state->dev->dma));
+	enable_dma(state->dev->dma);
 }
 
 static int icside_dma_setup(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = HWIF(drive);
+	struct icside_state *state = hwif->hwif_data;
 	struct request *rq = hwif->hwgroup->rq;
 	unsigned int dma_mode;
 
@@ -348,7 +350,7 @@ static int icside_dma_setup(ide_drive_t *drive)
 	/*
 	 * We can not enable DMA on both channels.
 	 */
-	BUG_ON(dma_channel_active(hwif->hw.dma));
+	BUG_ON(dma_channel_active(state->dev->dma));
 
 	icside_build_sglist(drive, rq);
 
@@ -365,14 +367,14 @@ static int icside_dma_setup(ide_drive_t *drive)
 	/*
 	 * Select the correct timing for this drive.
 	 */
-	set_dma_speed(hwif->hw.dma, drive->drive_data);
+	set_dma_speed(state->dev->dma, drive->drive_data);
 
 	/*
 	 * Tell the DMA engine about the SG table and
 	 * data direction.
 	 */
-	set_dma_sg(hwif->hw.dma, hwif->sg_table, hwif->sg_nents);
-	set_dma_mode(hwif->hw.dma, dma_mode);
+	set_dma_sg(state->dev->dma, hwif->sg_table, hwif->sg_nents);
+	set_dma_mode(state->dev->dma, dma_mode);
 
 	drive->waiting_for_dma = 1;
 
@@ -572,7 +574,6 @@ icside_register_v6(struct icside_state *state, struct expansion_card *ec)
 	hwif->serialized  = 1;
 	hwif->config_data = (unsigned long)ioc_base;
 	hwif->select_data = sel;
-	hwif->hw.dma      = ec->dma;
 
 	mate->maskproc    = icside_maskproc;
 	mate->channel     = 1;
@@ -581,7 +582,6 @@ icside_register_v6(struct icside_state *state, struct expansion_card *ec)
 	mate->serialized  = 1;
 	mate->config_data = (unsigned long)ioc_base;
 	mate->select_data = sel | 1;
-	mate->hw.dma      = ec->dma;
 
 	if (ec->dma != NO_DMA && !request_dma(ec->dma, hwif->name)) {
 		icside_dma_init(hwif);