ide: replace IDE_TFLAG_* flags by IDE_VALID_*

Replace IDE_TFLAG_{IN|OUT}_* flags meaning to the taskfile register validity on
input/output by the IDE_VALID_* flags and introduce 4 symmetric 8-bit register
validity indicator subfields, 'valid.{input/output}.{tf|hob}', into the 'struct
ide_cmd' instead of using the 'tf_flags' field for that purpose (this field can
then be turned from 32-bit into 8-bit one).

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 217b7fd..c9ef77c 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -71,11 +71,12 @@
 	u8 lba48 = !!(drive->dev_flags & IDE_DFLAG_LBA48);
 
 	memset(&cmd, 0, sizeof(cmd));
-	if (lba48)
-		cmd.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_HOB_LBA |
-				IDE_TFLAG_LBA48;
-	else
-		cmd.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_DEVICE;
+	if (lba48) {
+		cmd.valid.in.tf  = IDE_VALID_LBA;
+		cmd.valid.in.hob = IDE_VALID_LBA;
+		cmd.tf_flags = IDE_TFLAG_LBA48;
+	} else
+		cmd.valid.in.tf  = IDE_VALID_LBA | IDE_VALID_DEVICE;
 
 	drive->hwif->tp_ops->tf_read(drive, &cmd);