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, 6 insertions, 36 deletions

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) ||