ata: ahci: Convert __ahci_port_base to accepting hpriv as arguments

The port base address may be required even before the ata_host instance is
initialized and activated, for instance in the ahci_save_initial_config()
method which we are about to update (consider this modification as a
preparation for that one). Seeing the __ahci_port_base() function isn't
used much it's the best candidate to provide the required functionality.
So let's convert it to accepting the ahci_host_priv structure pointer.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

drivers/ata/ahci.c

@@ -690,7 +690,7 @@ static void ahci_pci_init_controller(struct ata_host *host)
 			mv = 2;
 		else
 			mv = 4;
-		port_mmio = __ahci_port_base(host, mv);
+		port_mmio = __ahci_port_base(hpriv, mv);
 
 		writel(0, port_mmio + PORT_IRQ_MASK);
 

drivers/ata/ahci.h

@@ -432,18 +432,19 @@ int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht);
 void ahci_error_handler(struct ata_port *ap);
 u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked);
 
-static inline void __iomem *__ahci_port_base(struct ata_host *host,
+static inline void __iomem *__ahci_port_base(struct ahci_host_priv *hpriv,
 					     unsigned int port_no)
 {
-	struct ahci_host_priv *hpriv = host->private_data;
 	void __iomem *mmio = hpriv->mmio;
 
 	return mmio + 0x100 + (port_no * 0x80);
 }
 
 static inline void __iomem *ahci_port_base(struct ata_port *ap)
 {
-	return __ahci_port_base(ap->host, ap->port_no);
+	struct ahci_host_priv *hpriv = ap->host->private_data;
+
+	return __ahci_port_base(hpriv, ap->port_no);
 }
 
 static inline int ahci_nr_ports(u32 cap)