ide: add ->tf_load and ->tf_read methods

* Add ->tf_load and ->tf_read methods to ide_hwif_t and set the default
  methods in default_hwif_transport().

* Use ->tf_{load,read} instead o calling ide_tf_{load,read}() directly.

* Make ide_tf_{load,read}() static.

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/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 5b675a0..8d7c1a0 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -330,7 +330,7 @@
 			tf->error = err;
 			tf->status = stat;
 
-			ide_tf_read(drive, task);
+			drive->hwif->tf_read(drive, task);
 
 			if (task->tf_flags & IDE_TFLAG_DYN)
 				kfree(task);
@@ -1638,7 +1638,7 @@
 	task.tf.lbah    = (bcount >> 8) & 0xff;
 
 	ide_tf_dump(drive->name, &task.tf);
-	ide_tf_load(drive, &task);
+	drive->hwif->tf_load(drive, &task);
 }
 
 EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load);