* rename the offset definition to avoid abiguity with the standard ATA
  IO address
* read and write four bytes at once like the original driver does
* use writesl() and readsl() which implicitly iterate over the data

This patch assumes buflen to be a multiple of four, which is true for
ATA devices. ATAPI support is not known, though unlikely, as the
original driver always transfers 512 Bytes at once.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Acked-by: Sergei Shtyltov <sshtylyov@ru.mvista.com>
---
--- a/drivers/ata/pata_rb532_cf.c
+++ b/drivers/ata/pata_rb532_cf.c
@@ -82,13 +82,10 @@ static unsigned int rb532_pata_data_xfer
 	void __iomem *ioaddr = ap->ioaddr.data_addr;
 	int retlen = buflen;
 
-	if (write_data) {
-		for (; buflen > 0; buflen--, buf++)
-			writeb(*buf, ioaddr);
-	} else {
-		for (; buflen > 0; buflen--, buf++)
-			*buf = readb(ioaddr);
-	}
+	if (write_data)
+		writesl(ioaddr, buf, buflen / sizeof(u32));
+	else
+		readsl(ioaddr, buf, buflen / sizeof(u32));
 
 	rb532_pata_finish_io(adev->link->ap);
 	return retlen;