1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index e178d6ae8b80..37471d3c1c28 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -39,6 +39,35 @@
 #include "libata.h"
 
 /**
+ *      ata_irq_on - Enable interrupts on a port.
+ *      @ap: Port on which interrupts are enabled.
+ *
+ *      Enable interrupts on a legacy IDE device using MMIO or PIO,
+ *      wait for idle, clear any pending interrupts.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+u8 ata_irq_on(struct ata_port *ap)
+{
+        struct ata_ioports *ioaddr = &ap->ioaddr;
+        u8 tmp;
+
+        ap->ctl &= ~ATA_NIEN;
+        ap->last_ctl = ap->ctl;
+
+        if (ap->flags & ATA_FLAG_MMIO)
+                writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
+        else
+                outb(ap->ctl, ioaddr->ctl_addr);
+        tmp = ata_wait_idle(ap);
+
+        ap->ops->irq_clear(ap);
+
+        return tmp;
+}
+
+/**
  *      ata_tf_load_pio - send taskfile registers to host controller
  *      @ap: Port to which output is sent
  *      @tf: ATA taskfile register set