ide: ->ide_dma_clear_irq() -> ->clear_irq()

* Rename ->ide_dma_clear_irq method to ->clear_irq
  and move it from ide_hwif_t to struct ide_port_ops.

* Move ->waiting_for_dma check inside ->clear_irq method.

* Move ->dma_base check inside ->clear_irq method.

piix.c:
* Add ich_port_ops and remove init_hwif_ich() wrapper.

There should be no functional changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 14d489c..37a4344 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -704,6 +704,7 @@
  * @resetproc:		routine to reset controller after a disk reset
  * @maskproc:		special host masking for drive selection
  * @quirkproc:		check host's drive quirk list
+ * @clear_irq:		clear IRQ
  *
  * @mdma_filter:	filter MDMA modes
  * @udma_filter:	filter UDMA modes
@@ -720,6 +721,7 @@
 	void	(*resetproc)(ide_drive_t *);
 	void	(*maskproc)(ide_drive_t *, int);
 	void	(*quirkproc)(ide_drive_t *);
+	void	(*clear_irq)(ide_drive_t *);
 
 	u8	(*mdma_filter)(ide_drive_t *);
 	u8	(*udma_filter)(ide_drive_t *);
@@ -782,8 +784,6 @@
 	const struct ide_port_ops	*port_ops;
 	const struct ide_dma_ops	*dma_ops;
 
-	void (*ide_dma_clear_irq)(ide_drive_t *drive);
-
 	/* dma physical region descriptor table (cpu view) */
 	unsigned int	*dmatable_cpu;
 	/* dma physical region descriptor table (dma view) */