ide: add struct ide_dma_ops (take 3)

Add struct ide_dma_ops and convert core code + drivers to use it.

While at it:

* Drop "ide_" prefix from ->ide_dma_end and ->ide_dma_test_irq methods.

* Drop "ide_" "infixes" from DMA methods.

* au1xxx-ide.c:
  - use auide_dma_{test_irq,end}() directly in auide_dma_timeout()

* pdc202xx_old.c:
  - drop "old_" "infixes" from DMA methods

* siimage.c:
  - add siimage_dma_test_irq() helper
  - print SATA warning in siimage_init_one()

* Remove no longer needed ->init_hwif implementations.

v2:
* Changes based on review from Sergei:
  - s/siimage_ide_dma_test_irq/siimage_dma_test_irq/
  - s/drive->hwif/hwif/ in idefloppy_pc_intr().
  - fix patch description w.r.t. au1xxx-ide changes
  - fix au1xxx-ide build
  - fix naming for cmd64*_dma_ops
  - drop "ide_" and "old_" infixes
  - s/hpt3xxx_dma_ops/hpt37x_dma_ops/
  - s/hpt370x_dma_ops/hpt370_dma_ops/
  - use correct DMA ops for HPT302/N, HPT371/N and HPT374
  - s/it821x_smart_dma_ops/it821x_pass_through_dma_ops/

v3:
* Two bugs slipped in v2 (noticed by Sergei):
  - use correct DMA ops for HPT374 (for real this time)
  - handle HPT370/HPT370A properly

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index bfec5d0..9c646bd 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -432,7 +432,7 @@
 	u8 stat			= 0;
 
 	if (drive->waiting_for_dma)
-		return hwif->ide_dma_test_irq(drive);
+		return hwif->dma_ops->dma_test_irq(drive);
 
 #if 0
 	/* need to guarantee 400ns since last command was issued */
@@ -703,8 +703,8 @@
 //		msleep(50);
 
 #ifdef CONFIG_BLK_DEV_IDEDMA
-	if (hwif->dma_host_set)	/* check if host supports DMA */
-		hwif->dma_host_set(drive, 0);
+	if (hwif->dma_ops)	/* check if host supports DMA */
+		hwif->dma_ops->dma_host_set(drive, 0);
 #endif
 
 	/* Skip setting PIO flow-control modes on pre-EIDE drives */
@@ -762,8 +762,8 @@
 #ifdef CONFIG_BLK_DEV_IDEDMA
 	if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 	    drive->using_dma)
-		hwif->dma_host_set(drive, 1);
-	else if (hwif->dma_host_set)	/* check if host supports DMA */
+		hwif->dma_ops->dma_host_set(drive, 1);
+	else if (hwif->dma_ops)	/* check if host supports DMA */
 		ide_dma_off_quietly(drive);
 #endif