[PATCH] ahci: separate out ahci_stop/start_engine

Separate out ahci_stop/start_engine().

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 39 insertions, 19 deletions

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 19bd346951dd..f3dfdab173f2 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -446,6 +446,43 @@ static void ahci_scr_write (struct ata_port *ap, unsigned int sc_reg_in,
         writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
 }
 
+static int ahci_stop_engine(struct ata_port *ap)
+{
+        void __iomem *mmio = ap->host_set->mmio_base;
+        void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+        int work;
+        u32 tmp;
+
+        tmp = readl(port_mmio + PORT_CMD);
+        tmp &= ~PORT_CMD_START;
+        writel(tmp, port_mmio + PORT_CMD);
+
+        /* wait for engine to stop.  TODO: this could be
+         * as long as 500 msec
+         */
+        work = 1000;
+        while (work-- > 0) {
+                tmp = readl(port_mmio + PORT_CMD);
+                if ((tmp & PORT_CMD_LIST_ON) == 0)
+                        return 0;
+                udelay(10);
+        }
+
+        return -EIO;
+}
+
+static void ahci_start_engine(struct ata_port *ap)
+{
+        void __iomem *mmio = ap->host_set->mmio_base;
+        void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+        u32 tmp;
+
+        tmp = readl(port_mmio + PORT_CMD);
+        tmp |= PORT_CMD_START;
+        writel(tmp, port_mmio + PORT_CMD);
+        readl(port_mmio + PORT_CMD); /* flush */
+}
+
 static void ahci_phy_reset(struct ata_port *ap)
 {
         void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
@@ -572,7 +609,6 @@ static void ahci_restart_port(struct ata_port *ap, u32 irq_stat)
         void __iomem *mmio = ap->host_set->mmio_base;
         void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
         u32 tmp;
-        int work;
 
         if ((ap->device[0].class != ATA_DEV_ATAPI) ||
             ((irq_stat & PORT_IRQ_TF_ERR) == 0))
@@ -588,20 +624,7 @@ static void ahci_restart_port(struct ata_port *ap, u32 irq_stat)
                         readl(port_mmio + PORT_SCR_ERR));
 
         /* stop DMA */
-        tmp = readl(port_mmio + PORT_CMD);
-        tmp &= ~PORT_CMD_START;
-        writel(tmp, port_mmio + PORT_CMD);
-
-        /* wait for engine to stop.  TODO: this could be
-         * as long as 500 msec
-         */
-        work = 1000;
-        while (work-- > 0) {
-                tmp = readl(port_mmio + PORT_CMD);
-                if ((tmp & PORT_CMD_LIST_ON) == 0)
-                        break;
-                udelay(10);
-        }
+        ahci_stop_engine(ap);
 
         /* clear SATA phy error, if any */
         tmp = readl(port_mmio + PORT_SCR_ERR);
@@ -620,10 +643,7 @@ static void ahci_restart_port(struct ata_port *ap, u32 irq_stat)
         }
 
         /* re-start DMA */
-        tmp = readl(port_mmio + PORT_CMD);
-        tmp |= PORT_CMD_START;
-        writel(tmp, port_mmio + PORT_CMD);
-        readl(port_mmio + PORT_CMD); /* flush */
+        ahci_start_engine(ap);
 }
 
 static void ahci_eng_timeout(struct ata_port *ap)