ahci: add defines for PORT_SCR_STAT register bits

Replace hard-coded register values with proper defines for PORT_SCR_STAT
register.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

drivers/block/ahci.c

@@ -207,7 +207,8 @@ static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 		j = 0;
 		while (j < WAIT_MS_LINKUP) {
 			tmp = readl(port_mmio + PORT_SCR_STAT);
-			if ((tmp & 0xf) == 0x3)
+			tmp &= PORT_SCR_STAT_DET_MASK;
+			if (tmp == PORT_SCR_STAT_DET_PHYRDY)
 				break;
 			udelay(1000);
 			j++;
@@ -258,7 +259,7 @@ static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 		/* register linkup ports */
 		tmp = readl(port_mmio + PORT_SCR_STAT);
 		debug("SATA port %d status: 0x%x\n", i, tmp);
-		if ((tmp & 0xf) == 0x03)
+		if ((tmp & PORT_SCR_STAT_DET_MASK) == PORT_SCR_STAT_DET_PHYRDY)
 			probe_ent->link_port_map |= (0x01 << i);
 	}
 

include/ahci.h

@@ -87,6 +87,11 @@
 				| PORT_IRQ_DMAS_FIS | PORT_IRQ_PIOS_FIS	\
 				| PORT_IRQ_D2H_REG_FIS
 
+/* PORT_SCR_STAT bits */
+#define PORT_SCR_STAT_DET_MASK	0x3
+#define PORT_SCR_STAT_DET_COMINIT 0x1
+#define PORT_SCR_STAT_DET_PHYRDY 0x3
+
 /* PORT_CMD bits */
 #define PORT_CMD_ATAPI		(1 << 24) /* Device is ATAPI */
 #define PORT_CMD_LIST_ON	(1 << 15) /* cmd list DMA engine running */