libata: add another IRQ calls (core and headers)

This patch is against the libata core and headers.

Two IRQ calls are added in ata_port_operations.
- irq_on() is used to enable interrupts.
- irq_ack() is used to acknowledge a device interrupt.

In most drivers, ata_irq_on() and ata_irq_ack() are used for
irq_on and irq_ack respectively.

In some drivers (ex: ahci, sata_sil24) which cannot use them
as is, ata_dummy_irq_on() and ata_dummy_irq_ack() are used.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Akira Iguchi <akira2.iguchi@toshiba.co.jp>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 41 insertions, 2 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index c561b3be4a97..16bc3e35bdd4 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -64,6 +64,46 @@ u8 ata_irq_on(struct ata_port *ap)
         return tmp;
 }
 
+u8 ata_dummy_irq_on (struct ata_port *ap)       { return 0; }
+
+/**
+ *      ata_irq_ack - Acknowledge a device interrupt.
+ *      @ap: Port on which interrupts are enabled.
+ *
+ *      Wait up to 10 ms for legacy IDE device to become idle (BUSY
+ *      or BUSY+DRQ clear).  Obtain dma status and port status from
+ *      device.  Clear the interrupt.  Return port status.
+ *
+ *      LOCKING:
+ */
+
+u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
+{
+        unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
+        u8 host_stat, post_stat, status;
+
+        status = ata_busy_wait(ap, bits, 1000);
+        if (status & bits)
+                if (ata_msg_err(ap))
+                        printk(KERN_ERR "abnormal status 0x%X\n", status);
+
+        /* get controller status; clear intr, err bits */
+        host_stat = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+        iowrite8(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
+                 ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+
+        post_stat = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+
+        if (ata_msg_intr(ap))
+                printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
+                        __FUNCTION__,
+                        host_stat, post_stat, status);
+
+        return status;
+}
+
+u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq) { return 0; }
+
 /**
  *      ata_tf_load - send taskfile registers to host controller
  *      @ap: Port to which output is sent
@@ -370,8 +410,7 @@ void ata_bmdma_thaw(struct ata_port *ap)
         /* clear & re-enable interrupts */
         ata_chk_status(ap);
         ap->ops->irq_clear(ap);
-        if (ap->ioaddr.ctl_addr)        /* FIXME: hack. create a hook instead */
-                ata_irq_on(ap);
+        ap->ops->irq_on(ap);
 }
 
 /**