ata_piix: sata_write must take a const void argument.

Signed-off-by: Tom Rini <trini@ti.com>

drivers/block/ata_piix.c

@@ -623,7 +623,7 @@ ulong sata_read(int device, ulong blknr, lbaint_t blkcnt, void *buff)
 	return n;
 }
 
-ulong sata_write(int device, ulong blknr, lbaint_t blkcnt, void *buff)
+ulong sata_write(int device, ulong blknr, lbaint_t blkcnt, const void *buff)
 {
 	ulong n = 0, *buffer = (ulong *)buff;
 	unsigned char status = 0, num = 0, dev = 0, mask = 0;

drivers/block/ata_piix.h

@@ -57,7 +57,7 @@ void dev_select(struct sata_ioports *ioaddr, int dev);
 u8 sata_busy_wait(struct sata_ioports *ioaddr, int bits, unsigned int max);
 u8 sata_chk_status(struct sata_ioports *ioaddr);
 ulong sata_read(int device, ulong blknr,lbaint_t blkcnt, void *buffer);
-ulong sata_write(int device,ulong blknr, lbaint_t blkcnt, void *buffer);
+ulong sata_write(int device,ulong blknr, lbaint_t blkcnt, const void *buffer);
 #endif
 
 /************DRIVER SPECIFIC DEFINITIONS AND DECLARATIONS**************/