[libata] ahci: minor internal cleanups

Minor cleanups, in preparation for merging Marvell PATA AHCI support in
the future.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/ahci.c

@@ -229,6 +229,9 @@ static void ahci_error_handler(struct ata_port *ap);
 static void ahci_vt8251_error_handler(struct ata_port *ap);
 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
 static int ahci_port_resume(struct ata_port *ap);
+static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl);
+static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
+			       u32 opts);
 #ifdef CONFIG_PM
 static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
 static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
@@ -481,11 +484,17 @@ static inline int ahci_nr_ports(u32 cap)
 	return (cap & 0x1f) + 1;
 }
 
+static inline void __iomem *__ahci_port_base(struct ata_host *host,
+					     unsigned int port_no)
+{
+	void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+
+	return mmio + 0x100 + (port_no * 0x80);
+}
+
 static inline void __iomem *ahci_port_base(struct ata_port *ap)
 {
-	void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
-
-	return mmio + 0x100 + (ap->port_no * 0x80);
+	return __ahci_port_base(ap->host, ap->port_no);
 }
 
 /**
@@ -1750,14 +1759,18 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	host->private_data = hpriv;
 
 	for (i = 0; i < host->n_ports; i++) {
-		if (hpriv->port_map & (1 << i)) {
-			struct ata_port *ap = host->ports[i];
-			void __iomem *port_mmio = ahci_port_base(ap);
+		struct ata_port *ap = host->ports[i];
+		void __iomem *port_mmio = ahci_port_base(ap);
 
+		/* standard SATA port setup */
+		if (hpriv->port_map & (1 << i)) {
 			ap->ioaddr.cmd_addr = port_mmio;
 			ap->ioaddr.scr_addr = port_mmio + PORT_SCR;
-		} else
-			host->ports[i]->ops = &ata_dummy_port_ops;
+		}
+
+		/* disabled/not-implemented port */
+		else
+			ap->ops = &ata_dummy_port_ops;
 	}
 
 	/* initialize adapter */