pdc202xx_old: remove broken SWDMA support

Documentation doesn't mention SWDMA and moreover all timings used
for SWDMA modes were over-clocked when compared to ATA spec.
Acked-by: NSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/pdc202xx_old.c

 /*
- *  linux/drivers/ide/pci/pdc202xx_old.c	Version 0.51	Jul 27, 2007
+ *  linux/drivers/ide/pci/pdc202xx_old.c	Version 0.52	Aug 27, 2007
  *
  *  Copyright (C) 1998-2002		Andre Hedrick <andre@linux-ide.org>
  *  Copyright (C) 2006-2007		MontaVista Software, Inc.
@@ -97,9 +97,6 @@ static void pdc202xx_set_mode(ide_drive_t *drive, const u8 speed)
 		case XFER_MW_DMA_2:	TB = 0x60; TC = 0x03; break;
 		case XFER_MW_DMA_1:	TB = 0x60; TC = 0x04; break;
 		case XFER_MW_DMA_0:	TB = 0xE0; TC = 0x0F; break;
-		case XFER_SW_DMA_2:	TB = 0x60; TC = 0x05; break;
-		case XFER_SW_DMA_1:	TB = 0x80; TC = 0x06; break;
-		case XFER_SW_DMA_0:	TB = 0xC0; TC = 0x0B; break;
 		case XFER_PIO_4:	TA = 0x01; TB = 0x04; break;
 		case XFER_PIO_3:	TA = 0x02; TB = 0x06; break;
 		case XFER_PIO_2:	TA = 0x03; TB = 0x08; break;
@@ -329,7 +326,6 @@ static void __devinit init_hwif_pdc202xx(ide_hwif_t *hwif)
 
 	hwif->ultra_mask = hwif->cds->udma_mask;
 	hwif->mwdma_mask = 0x07;
-	hwif->swdma_mask = 0x07;
 
 	hwif->dma_lost_irq = &pdc202xx_dma_lost_irq;
 	hwif->dma_timeout = &pdc202xx_dma_timeout;