pata_sis: extract a sis_port_base() method

This is similar to the existing sis_old_port_base() method. We do this
same calculation and logic in multiple places (with one more to come in
a future patch), so extracting it into a method makes sense.

Reviewed-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 28 insertions, 18 deletions

diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index 533f2aefab87..10af293b1c6f 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -89,6 +89,29 @@ static int sis_old_port_base(struct ata_device *adev)
 }
 
 /**
+ *      sis_port_base           -       return PCI configuration base for dev
+ *      @adev: device
+ *
+ *      Returns the base of the PCI configuration registers for this port
+ *      number.
+ */
+
+static int sis_port_base(struct ata_device *adev)
+{
+        struct ata_port *ap = adev->link->ap;
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        int port = 0x40;
+        u32 reg54;
+
+        /* If bit 30 is set then the registers are mapped at 0x70 not 0x40 */
+        pci_read_config_dword(pdev, 0x54, &reg54);
+        if (reg54 & 0x40000000)
+                port = 0x70;
+
+        return port + (8 * ap->port_no) + (4 * adev->devno);
+}
+
+/**
  *      sis_133_cable_detect    -       check for 40/80 pin
  *      @ap: Port
  *      @deadline: deadline jiffies for the operation
@@ -266,9 +289,8 @@ static void sis_100_set_piomode (struct ata_port *ap, struct ata_device *adev)
 static void sis_133_set_piomode (struct ata_port *ap, struct ata_device *adev)
 {
         struct pci_dev *pdev    = to_pci_dev(ap->host->dev);
-        int port = 0x40;
+        int port;
         u32 t1;
-        u32 reg54;
         int speed = adev->pio_mode - XFER_PIO_0;
 
         const u32 timing133[] = {
@@ -288,12 +310,7 @@ static void sis_133_set_piomode (struct ata_port *ap, struct ata_device *adev)
 
         sis_set_fifo(ap, adev);
 
-        /* If bit 14 is set then the registers are mapped at 0x70 not 0x40 */
-        pci_read_config_dword(pdev, 0x54, &reg54);
-        if (reg54 & 0x40000000)
-                port = 0x70;
-        port += 8 * ap->port_no +  4 * adev->devno;
-
+        port = sis_port_base(adev);
         pci_read_config_dword(pdev, port, &t1);
         t1 &= 0xC0C00FFF;       /* Mask out timing */
 
@@ -465,21 +482,14 @@ static void sis_133_early_set_dmamode (struct ata_port *ap, struct ata_device *a
 static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
 {
         struct pci_dev *pdev    = to_pci_dev(ap->host->dev);
-        int speed = adev->dma_mode - XFER_MW_DMA_0;
-        int port = 0x40;
+        int port;
         u32 t1;
-        u32 reg54;
 
         /* bits 4- cycle time 8 - cvs time */
         static const u32 timing_u100[] = { 0x6B0, 0x470, 0x350, 0x140, 0x120, 0x110, 0x000 };
         static const u32 timing_u133[] = { 0x9F0, 0x6A0, 0x470, 0x250, 0x230, 0x220, 0x210 };
 
-        /* If bit 14 is set then the registers are mapped at 0x70 not 0x40 */
-        pci_read_config_dword(pdev, 0x54, &reg54);
-        if (reg54 & 0x40000000)
-                port = 0x70;
-        port += (8 * ap->port_no) +  (4 * adev->devno);
-
+        port = sis_port_base(adev);
         pci_read_config_dword(pdev, port, &t1);
 
         if (adev->dma_mode < XFER_UDMA_0) {
@@ -487,7 +497,7 @@ static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
                 /* FIXME: need data sheet to add MWDMA here. Also lacking on
                    ide/pci driver */
         } else {
-                speed = adev->dma_mode - XFER_UDMA_0;
+                int speed = adev->dma_mode - XFER_UDMA_0;
                 /* if & 8 no UDMA133 - need info for ... */
                 t1 &= ~0x00000FF0;
                 t1 |= 0x00000004;