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>

3 files changed, 57 insertions, 48 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f210dbd4cbe6..2e8ca652c0d9 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2664,8 +2664,7 @@ void ata_bus_reset(struct ata_port *ap)
                 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
 
         /* re-enable interrupts */
-        if (ap->ioaddr.ctl_addr)        /* FIXME: hack. create a hook instead */
-                ata_irq_on(ap);
+        ap->ops->irq_on(ap);
 
         /* is double-select really necessary? */
         if (ap->device[1].class != ATA_DEV_NONE)
@@ -3054,11 +3053,8 @@ void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
                 sata_scr_write(ap, SCR_ERROR, serror);
 
         /* re-enable interrupts */
-        if (!ap->ops->error_handler) {
-                /* FIXME: hack. create a hook instead */
-                if (ap->ioaddr.ctl_addr)
-                        ata_irq_on(ap);
-        }
+        if (!ap->ops->error_handler)
+                ap->ops->irq_on(ap);
 
         /* is double-select really necessary? */
         if (classes[0] != ATA_DEV_NONE)
@@ -4169,7 +4165,7 @@ static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
                         qc = ata_qc_from_tag(ap, qc->tag);
                         if (qc) {
                                 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
-                                        ata_irq_on(ap);
+                                        ap->ops->irq_on(ap);
                                         ata_qc_complete(qc);
                                 } else
                                         ata_port_freeze(ap);
@@ -4185,7 +4181,7 @@ static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
         } else {
                 if (in_wq) {
                         spin_lock_irqsave(ap->lock, flags);
-                        ata_irq_on(ap);
+                        ap->ops->irq_on(ap);
                         ata_qc_complete(qc);
                         spin_unlock_irqrestore(ap->lock, flags);
                 } else
@@ -5010,7 +5006,7 @@ idle_irq:
 
 #ifdef ATA_IRQ_TRAP
         if ((ap->stats.idle_irq % 1000) == 0) {
-                ata_irq_ack(ap, 0); /* debug trap */
+                ap->ops->irq_ack(ap, 0); /* debug trap */
                 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
                 return 1;
         }
@@ -6271,3 +6267,7 @@ EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
 EXPORT_SYMBOL_GPL(ata_do_eh);
+EXPORT_SYMBOL_GPL(ata_irq_on);
+EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
+EXPORT_SYMBOL_GPL(ata_irq_ack);
+EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
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);
 }
 
 /**
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 308bb8cbe50f..bdfe6ea8edf7 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -632,6 +632,8 @@ struct ata_port_operations {
 
         irq_handler_t irq_handler;
         void (*irq_clear) (struct ata_port *);
+        u8 (*irq_on) (struct ata_port *);
+        u8 (*irq_ack) (struct ata_port *ap, unsigned int chk_drq);
 
         u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
         void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
@@ -813,6 +815,10 @@ extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
                                        int queue_depth);
 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
+extern u8 ata_irq_on(struct ata_port *ap);
+extern u8 ata_dummy_irq_on(struct ata_port *ap);
+extern u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq);
+extern u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq);
 
 /*
  * Timing helpers
@@ -1147,42 +1153,6 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
         qc->result_tf.feature = 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:
- */
-
-static inline 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;
-}
-
 static inline int ata_try_flush_cache(const struct ata_device *dev)
 {
         return ata_id_wcache_enabled(dev->id) ||