scsi: esp_scsi: move dma mapping into the core code

Except for the mac_esp driver, which uses PIO or pseudo DMA, all drivers
share the same dma mapping calls.  Move the dma mapping into the core
code using the scsi_dma_map / scsi_dma_unmap helpers, with a special
identify mapping variant triggered off a new ESP_FLAG_NO_DMA_MAP flag
for mac_esp.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/sun3x_esp.c

@@ -60,30 +60,6 @@ static u8 sun3x_esp_read8(struct esp *esp, unsigned long reg)
 	return readb(esp->regs + (reg * 4UL));
 }
 
-static dma_addr_t sun3x_esp_map_single(struct esp *esp, void *buf,
-				      size_t sz, int dir)
-{
-	return dma_map_single(esp->dev, buf, sz, dir);
-}
-
-static int sun3x_esp_map_sg(struct esp *esp, struct scatterlist *sg,
-				  int num_sg, int dir)
-{
-	return dma_map_sg(esp->dev, sg, num_sg, dir);
-}
-
-static void sun3x_esp_unmap_single(struct esp *esp, dma_addr_t addr,
-				  size_t sz, int dir)
-{
-	dma_unmap_single(esp->dev, addr, sz, dir);
-}
-
-static void sun3x_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
-			      int num_sg, int dir)
-{
-	dma_unmap_sg(esp->dev, sg, num_sg, dir);
-}
-
 static int sun3x_esp_irq_pending(struct esp *esp)
 {
 	if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
@@ -182,10 +158,6 @@ static int sun3x_esp_dma_error(struct esp *esp)
 static const struct esp_driver_ops sun3x_esp_ops = {
 	.esp_write8	=	sun3x_esp_write8,
 	.esp_read8	=	sun3x_esp_read8,
-	.map_single	=	sun3x_esp_map_single,
-	.map_sg		=	sun3x_esp_map_sg,
-	.unmap_single	=	sun3x_esp_unmap_single,
-	.unmap_sg	=	sun3x_esp_unmap_sg,
 	.irq_pending	=	sun3x_esp_irq_pending,
 	.reset_dma	=	sun3x_esp_reset_dma,
 	.dma_drain	=	sun3x_esp_dma_drain,