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>

17 files changed, 159 insertions, 118 deletions

diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index 12f4369..f0db4d3 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -319,7 +319,8 @@ static int do_drive_set_taskfiles(ide_drive_t *drive,
 		/* convert GTF to taskfile */
 		memset(&cmd, 0, sizeof(cmd));
 		memcpy(&cmd.tf_array[7], gtf, REGS_PER_GTF);
-		cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+		cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+		cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 		err = ide_no_data_taskfile(drive, &cmd);
 		if (err) {
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 3e43b88..a359323 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -257,8 +257,7 @@ void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 	struct ide_cmd cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM |
-		       IDE_TFLAG_IN_NSECT;
+	cmd.valid.in.tf = IDE_VALID_LBAH | IDE_VALID_LBAM | IDE_VALID_NSECT;
 
 	drive->hwif->tp_ops->tf_read(drive, &cmd);
 
@@ -439,12 +438,12 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 	return ide_started;
 }
 
-static void ide_init_packet_cmd(struct ide_cmd *cmd, u32 tf_flags,
+static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
 				u16 bcount, u8 dma)
 {
-	cmd->protocol  = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
-	cmd->tf_flags |= IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
-			 IDE_TFLAG_OUT_FEATURE | tf_flags;
+	cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
+	cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
+			    IDE_VALID_FEATURE | valid_tf;
 	cmd->tf.command = ATA_CMD_PACKET;
 	cmd->tf.feature = dma;		/* Use PIO/DMA */
 	cmd->tf.lbam    = bcount & 0xff;
@@ -456,7 +455,7 @@ static u8 ide_read_ireason(ide_drive_t *drive)
 	struct ide_cmd cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_IN_NSECT;
+	cmd.valid.in.tf = IDE_VALID_NSECT;
 
 	drive->hwif->tp_ops->tf_read(drive, &cmd);
 
@@ -588,12 +587,12 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 	ide_expiry_t *expiry = NULL;
 	struct request *rq = hwif->rq;
 	unsigned int timeout;
-	u32 tf_flags;
 	u16 bcount;
+	u8 valid_tf;
 	u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
 
 	if (dev_is_idecd(drive)) {
-		tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
+		valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
 		bcount = ide_cd_get_xferlen(rq);
 		expiry = ide_cd_expiry;
 		timeout = ATAPI_WAIT_PC;
@@ -607,7 +606,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 		pc->xferred = 0;
 		pc->cur_pos = pc->buf;
 
-		tf_flags = IDE_TFLAG_OUT_DEVICE;
+		valid_tf = IDE_VALID_DEVICE;
 		bcount = ((drive->media == ide_tape) ?
 				pc->req_xfer :
 				min(pc->req_xfer, 63 * 1024));
@@ -627,7 +626,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 						       : WAIT_TAPE_CMD;
 	}
 
-	ide_init_packet_cmd(cmd, tf_flags, bcount, drive->dma);
+	ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
 
 	(void)do_rw_taskfile(drive, cmd);
 
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index c998cf8..235263e 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -97,7 +97,8 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
 	}
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 	if (drive->dev_flags & IDE_DFLAG_LBA) {
 		if (lba48) {
@@ -116,7 +117,9 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
 			tf->lbam   = (u8)(block >>  8);
 			tf->lbah   = (u8)(block >> 16);
 
-			cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
+			cmd.valid.out.hob = IDE_VALID_OUT_HOB;
+			cmd.valid.in.hob  = IDE_VALID_IN_HOB;
+			cmd.tf_flags |= IDE_TFLAG_LBA48;
 		} else {
 			tf->nsect  = nsectors & 0xff;
 			tf->lbal   = block;
@@ -220,9 +223,13 @@ static u64 idedisk_read_native_max_address(ide_drive_t *drive, int lba48)
 		tf->command = ATA_CMD_READ_NATIVE_MAX;
 	tf->device  = ATA_LBA;
 
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
-	if (lba48)
-		cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
+	if (lba48) {
+		cmd.valid.out.hob = IDE_VALID_OUT_HOB;
+		cmd.valid.in.hob  = IDE_VALID_IN_HOB;
+		cmd.tf_flags = IDE_TFLAG_LBA48;
+	}
 
 	ide_no_data_taskfile(drive, &cmd);
 
@@ -260,9 +267,13 @@ static u64 idedisk_set_max_address(ide_drive_t *drive, u64 addr_req, int lba48)
 	}
 	tf->device |= ATA_LBA;
 
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
-	if (lba48)
-		cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
+	if (lba48) {
+		cmd.valid.out.hob = IDE_VALID_OUT_HOB;
+		cmd.valid.in.hob  = IDE_VALID_IN_HOB;
+		cmd.tf_flags = IDE_TFLAG_LBA48;
+	}
 
 	ide_no_data_taskfile(drive, &cmd);
 
@@ -395,8 +406,8 @@ static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
 		cmd->tf.command = ATA_CMD_FLUSH_EXT;
 	else
 		cmd->tf.command = ATA_CMD_FLUSH;
-	cmd->tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE |
-			IDE_TFLAG_DYN;
+	cmd->valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd->tf_flags = IDE_TFLAG_DYN;
 	cmd->protocol = ATA_PROT_NODATA;
 
 	rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
@@ -457,7 +468,8 @@ static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect)
 	cmd.tf.feature = feature;
 	cmd.tf.nsect   = nsect;
 	cmd.tf.command = ATA_CMD_SET_FEATURES;
-	cmd.tf_flags   = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 	return ide_no_data_taskfile(drive, &cmd);
 }
@@ -533,7 +545,8 @@ static int do_idedisk_flushcache(ide_drive_t *drive)
 		cmd.tf.command = ATA_CMD_FLUSH_EXT;
 	else
 		cmd.tf.command = ATA_CMD_FLUSH;
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 	return ide_no_data_taskfile(drive, &cmd);
 }
@@ -715,7 +728,8 @@ static int ide_disk_set_doorlock(ide_drive_t *drive, struct gendisk *disk,
 
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.tf.command = on ? ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK;
-	cmd.tf_flags   = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 	ret = ide_no_data_taskfile(drive, &cmd);
 
diff --git a/drivers/ide/ide-disk_proc.c b/drivers/ide/ide-disk_proc.c
index eaea3be..19f263b 100644
--- a/drivers/ide/ide-disk_proc.c
+++ b/drivers/ide/ide-disk_proc.c
@@ -13,7 +13,8 @@ static int smart_enable(ide_drive_t *drive)
 	tf->lbam    = ATA_SMART_LBAM_PASS;
 	tf->lbah    = ATA_SMART_LBAH_PASS;
 	tf->command = ATA_CMD_SMART;
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 	return ide_no_data_taskfile(drive, &cmd);
 }
@@ -29,7 +30,8 @@ static int get_smart_data(ide_drive_t *drive, u8 *buf, u8 sub_cmd)
 	tf->lbam    = ATA_SMART_LBAM_PASS;
 	tf->lbah    = ATA_SMART_LBAH_PASS;
 	tf->command = ATA_CMD_SMART;
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 	cmd.protocol = ATA_PROT_PIO;
 
 	return ide_raw_taskfile(drive, &cmd, buf, 1);
diff --git a/drivers/ide/ide-io-std.c b/drivers/ide/ide-io-std.c
index 9cac281..8b0b2e9 100644
--- a/drivers/ide/ide-io-std.c
+++ b/drivers/ide/ide-io-std.c
@@ -91,6 +91,7 @@ void ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
 	struct ide_io_ports *io_ports = &hwif->io_ports;
 	struct ide_taskfile *tf = &cmd->tf;
 	void (*tf_outb)(u8 addr, unsigned long port);
+	u8 valid = cmd->valid.out.hob;
 	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 	u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 
@@ -102,29 +103,31 @@ void ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
 	if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
 		HIHI = 0xFF;
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
+	if (valid & IDE_VALID_FEATURE)
 		tf_outb(tf->hob_feature, io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		tf_outb(tf->hob_nsect, io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		tf_outb(tf->hob_lbal, io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		tf_outb(tf->hob_lbam, io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
+	valid = cmd->valid.out.tf;
+
+	if (valid & IDE_VALID_FEATURE)
 		tf_outb(tf->feature, io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		tf_outb(tf->nsect, io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		tf_outb(tf->lbal, io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		tf_outb(tf->lbam, io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		tf_outb(tf->lbah, io_ports->lbah_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
+	if (valid & IDE_VALID_DEVICE)
 		tf_outb((tf->device & HIHI) | drive->select,
 			 io_ports->device_addr);
 }
@@ -137,6 +140,7 @@ void ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	struct ide_taskfile *tf = &cmd->tf;
 	void (*tf_outb)(u8 addr, unsigned long port);
 	u8 (*tf_inb)(unsigned long port);
+	u8 valid = cmd->valid.in.tf;
 	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 
 	if (mmio) {
@@ -150,31 +154,33 @@ void ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	/* be sure we're looking at the low order bits */
 	tf_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_IN_ERROR)
+	if (valid & IDE_VALID_ERROR)
 		tf->error  = tf_inb(io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		tf->nsect  = tf_inb(io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		tf->lbal   = tf_inb(io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		tf->lbam   = tf_inb(io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		tf->lbah   = tf_inb(io_ports->lbah_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
+	if (valid & IDE_VALID_DEVICE)
 		tf->device = tf_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 		tf_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR)
+		valid = cmd->valid.in.hob;
+
+		if (valid & IDE_VALID_ERROR)
 			tf->hob_error = tf_inb(io_ports->feature_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
+		if (valid & IDE_VALID_NSECT)
 			tf->hob_nsect = tf_inb(io_ports->nsect_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
+		if (valid & IDE_VALID_LBAL)
 			tf->hob_lbal  = tf_inb(io_ports->lbal_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
+		if (valid & IDE_VALID_LBAM)
 			tf->hob_lbam  = tf_inb(io_ports->lbam_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
+		if (valid & IDE_VALID_LBAH)
 			tf->hob_lbah  = tf_inb(io_ports->lbah_addr);
 	}
 }
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 1deb6d2..99bb0a9 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -205,8 +205,9 @@ static ide_startstop_t ide_disk_special(ide_drive_t *drive)
 		return ide_stopped;
 	}
 
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE |
-		       IDE_TFLAG_CUSTOM_HANDLER;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
+	cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER;
 
 	do_rw_taskfile(drive, &cmd);
 
diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c
index 7701427..b11df4b 100644
--- a/drivers/ide/ide-ioctls.c
+++ b/drivers/ide/ide-ioctls.c
@@ -141,11 +141,12 @@ static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
 		tf->lbal  = args[1];
 		tf->lbam  = 0x4f;
 		tf->lbah  = 0xc2;
-		cmd.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_IN_NSECT;
+		cmd.valid.out.tf = IDE_VALID_OUT_TF;
+		cmd.valid.in.tf  = IDE_VALID_NSECT;
 	} else {
 		tf->nsect = args[1];
-		cmd.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
-			       IDE_TFLAG_IN_NSECT;
+		cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
+		cmd.valid.in.tf  = IDE_VALID_NSECT;
 	}
 	tf->command = args[0];
 	cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
@@ -207,7 +208,8 @@ static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
 	memset(&cmd, 0, sizeof(cmd));
 	memcpy(&cmd.tf_array[7], &args[1], 6);
 	cmd.tf.command = args[0];
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 
 	err = ide_no_data_taskfile(drive, &cmd);
 
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 27bb70d..0fdf0df 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -40,7 +40,7 @@ u8 ide_read_error(ide_drive_t *drive)
 	struct ide_cmd cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_IN_ERROR;
+	cmd.valid.in.tf = IDE_VALID_ERROR;
 
 	drive->hwif->tp_ops->tf_read(drive, &cmd);
 
@@ -348,7 +348,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 	tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
+	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 	cmd.tf.feature = SETFEATURES_XFER;
 	cmd.tf.nsect   = speed;
 
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 @@ static void ide_dump_sector(ide_drive_t *drive)
 	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);
 
diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c
index 9490b44..310d03f 100644
--- a/drivers/ide/ide-park.c
+++ b/drivers/ide/ide-park.c
@@ -74,7 +74,8 @@ ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq)
 		tf->lbal = 0x4c;
 		tf->lbam = 0x4e;
 		tf->lbah = 0x55;
-		cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+		cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+		cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 	} else		/* cmd == REQ_UNPARK_HEADS */
 		tf->command = ATA_CMD_CHK_POWER;
 
diff --git a/drivers/ide/ide-pm.c b/drivers/ide/ide-pm.c
index bb7858e..0d8a151 100644
--- a/drivers/ide/ide-pm.c
+++ b/drivers/ide/ide-pm.c
@@ -163,7 +163,8 @@ ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 	return ide_stopped;
 
 out_do_tf:
-	cmd->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd->valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd->valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 	cmd->protocol = ATA_PROT_NODATA;
 
 	return do_rw_taskfile(drive, cmd);
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index c1ef8c8..6a98d7c 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -287,7 +287,7 @@ int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
 
 		memset(&cmd, 0, sizeof(cmd));
 		/* disable DMA & overlap */
-		cmd.tf_flags = IDE_TFLAG_OUT_FEATURE;
+		cmd.valid.out.tf = IDE_VALID_FEATURE;
 
 		tp_ops->tf_load(drive, &cmd);
 	}
@@ -340,7 +340,7 @@ static u8 ide_read_device(ide_drive_t *drive)
 	struct ide_cmd cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_IN_DEVICE;
+	cmd.valid.in.tf = IDE_VALID_DEVICE;
 
 	drive->hwif->tp_ops->tf_read(drive, &cmd);
 
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index 10a88bf..3242698 100644
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -204,8 +204,8 @@ static int set_xfer_rate (ide_drive_t *drive, int arg)
 	cmd.tf.command = ATA_CMD_SET_FEATURES;
 	cmd.tf.feature = SETFEATURES_XFER;
 	cmd.tf.nsect   = (u8)arg;
-	cmd.tf_flags   = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
-			 IDE_TFLAG_IN_NSECT;
+	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
+	cmd.valid.in.tf  = IDE_VALID_NSECT;
 
 	err = ide_no_data_taskfile(drive, &cmd);
 
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 243421c..dc84f8b 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -47,7 +47,8 @@ int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
 		cmd.tf.command = ATA_CMD_ID_ATA;
 	else
 		cmd.tf.command = ATA_CMD_ID_ATAPI;
-	cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 	cmd.protocol = ATA_PROT_PIO;
 
 	return ide_raw_taskfile(drive, &cmd, buf, 1);
@@ -494,11 +495,14 @@ int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
 	memcpy(&cmd.tf_array[6], req_task->io_ports,
 	       HDIO_DRIVE_TASK_HDR_SIZE);
 
-	cmd.tf_flags   = IDE_TFLAG_IO_16BIT | IDE_TFLAG_DEVICE |
-			 IDE_TFLAG_IN_TF;
+	cmd.valid.out.tf = IDE_VALID_DEVICE;
+	cmd.valid.in.tf  = IDE_VALID_DEVICE | IDE_VALID_IN_TF;
+	cmd.tf_flags = IDE_TFLAG_IO_16BIT;
 
-	if (drive->dev_flags & IDE_DFLAG_LBA48)
-		cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_IN_HOB);
+	if (drive->dev_flags & IDE_DFLAG_LBA48) {
+		cmd.tf_flags |= IDE_TFLAG_LBA48;
+		cmd.valid.in.hob = IDE_VALID_IN_HOB;
+	}
 
 	if (req_task->out_flags.all) {
 		cmd.ftf_flags |= IDE_FTFLAG_FLAGGED;
@@ -507,28 +511,28 @@ int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
 			cmd.ftf_flags |= IDE_FTFLAG_OUT_DATA;
 
 		if (req_task->out_flags.b.nsector_hob)
-			cmd.tf_flags |= IDE_TFLAG_OUT_HOB_NSECT;
+			cmd.valid.out.hob |= IDE_VALID_NSECT;
 		if (req_task->out_flags.b.sector_hob)
-			cmd.tf_flags |= IDE_TFLAG_OUT_HOB_LBAL;
+			cmd.valid.out.hob |= IDE_VALID_LBAL;
 		if (req_task->out_flags.b.lcyl_hob)
-			cmd.tf_flags |= IDE_TFLAG_OUT_HOB_LBAM;
+			cmd.valid.out.hob |= IDE_VALID_LBAM;
 		if (req_task->out_flags.b.hcyl_hob)
-			cmd.tf_flags |= IDE_TFLAG_OUT_HOB_LBAH;
+			cmd.valid.out.hob |= IDE_VALID_LBAH;
 
 		if (req_task->out_flags.b.error_feature)
-			cmd.tf_flags |= IDE_TFLAG_OUT_FEATURE;
+			cmd.valid.out.tf  |= IDE_VALID_FEATURE;
 		if (req_task->out_flags.b.nsector)
-			cmd.tf_flags |= IDE_TFLAG_OUT_NSECT;
+			cmd.valid.out.tf  |= IDE_VALID_NSECT;
 		if (req_task->out_flags.b.sector)
-			cmd.tf_flags |= IDE_TFLAG_OUT_LBAL;
+			cmd.valid.out.tf  |= IDE_VALID_LBAL;
 		if (req_task->out_flags.b.lcyl)
-			cmd.tf_flags |= IDE_TFLAG_OUT_LBAM;
+			cmd.valid.out.tf  |= IDE_VALID_LBAM;
 		if (req_task->out_flags.b.hcyl)
-			cmd.tf_flags |= IDE_TFLAG_OUT_LBAH;
+			cmd.valid.out.tf  |= IDE_VALID_LBAH;
 	} else {
-		cmd.tf_flags |= IDE_TFLAG_OUT_TF;
+		cmd.valid.out.tf |= IDE_VALID_OUT_TF;
 		if (cmd.tf_flags & IDE_TFLAG_LBA48)
-			cmd.tf_flags |= IDE_TFLAG_OUT_HOB;
+			cmd.valid.out.hob |= IDE_VALID_OUT_HOB;
 	}
 
 	if (req_task->in_flags.b.data)
diff --git a/drivers/ide/ns87415.c b/drivers/ide/ns87415.c
index 71a39fb..0208dd3 100644
--- a/drivers/ide/ns87415.c
+++ b/drivers/ide/ns87415.c
@@ -65,35 +65,38 @@ static void superio_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	struct ide_io_ports *io_ports = &drive->hwif->io_ports;
 	struct ide_taskfile *tf = &cmd->tf;
+	u8 valid = cmd->valid.in.tf;
 
 	/* be sure we're looking at the low order bits */
 	outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_IN_ERROR)
+	if (valid & IDE_VALID_ERROR)
 		tf->error  = inb(io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		tf->nsect  = inb(io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		tf->lbal   = inb(io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		tf->lbam   = inb(io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		tf->lbah   = inb(io_ports->lbah_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
+	if (valid & IDE_VALID_DEVICE)
 		tf->device = superio_ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 		outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR)
+		valid = cmd->valid.in.hob;
+
+		if (valid & IDE_VALID_ERROR)
 			tf->hob_error = inb(io_ports->feature_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
+		if (valid & IDE_VALID_NSECT)
 			tf->hob_nsect = inb(io_ports->nsect_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
+		if (valid & IDE_VALID_LBAL)
 			tf->hob_lbal  = inb(io_ports->lbal_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
+		if (valid & IDE_VALID_LBAM)
 			tf->hob_lbam  = inb(io_ports->lbam_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
+		if (valid & IDE_VALID_LBAH)
 			tf->hob_lbah  = inb(io_ports->lbah_addr);
 	}
 }
diff --git a/drivers/ide/scc_pata.c b/drivers/ide/scc_pata.c
index 55e48db..38a715e 100644
--- a/drivers/ide/scc_pata.c
+++ b/drivers/ide/scc_pata.c
@@ -649,34 +649,37 @@ static void scc_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	struct ide_io_ports *io_ports = &drive->hwif->io_ports;
 	struct ide_taskfile *tf = &cmd->tf;
+	u8 valid = cmd->valid.out.hob;
 	u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 
 	if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
 		HIHI = 0xFF;
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
+	if (valid & IDE_VALID_FEATURE)
 		scc_ide_outb(tf->hob_feature, io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		scc_ide_outb(tf->hob_nsect, io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		scc_ide_outb(tf->hob_lbal, io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		scc_ide_outb(tf->hob_lbam, io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		scc_ide_outb(tf->hob_lbah, io_ports->lbah_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
+	valid = cmd->valid.out.tf;
+
+	if (valid & IDE_VALID_FEATURE)
 		scc_ide_outb(tf->feature, io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		scc_ide_outb(tf->nsect, io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		scc_ide_outb(tf->lbal, io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		scc_ide_outb(tf->lbam, io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		scc_ide_outb(tf->lbah, io_ports->lbah_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
+	if (valid & IDE_VALID_DEVICE)
 		scc_ide_outb((tf->device & HIHI) | drive->select,
 			     io_ports->device_addr);
 }
@@ -685,35 +688,38 @@ static void scc_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	struct ide_io_ports *io_ports = &drive->hwif->io_ports;
 	struct ide_taskfile *tf = &cmd->tf;
+	u8 valid = cmd->valid.in.tf;
 
 	/* be sure we're looking at the low order bits */
 	scc_ide_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
-	if (cmd->tf_flags & IDE_TFLAG_IN_ERROR)
+	if (valid & IDE_VALID_ERROR)
 		tf->error  = scc_ide_inb(io_ports->feature_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
+	if (valid & IDE_VALID_NSECT)
 		tf->nsect  = scc_ide_inb(io_ports->nsect_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
+	if (valid & IDE_VALID_LBAL)
 		tf->lbal   = scc_ide_inb(io_ports->lbal_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
+	if (valid & IDE_VALID_LBAM)
 		tf->lbam   = scc_ide_inb(io_ports->lbam_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
+	if (valid & IDE_VALID_LBAH)
 		tf->lbah   = scc_ide_inb(io_ports->lbah_addr);
-	if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
+	if (valid & IDE_VALID_DEVICE)
 		tf->device = scc_ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 		scc_ide_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR)
+		valid = cmd->valid.in.hob;
+
+		if (valid & IDE_VALID_ERROR)
 			tf->hob_error = scc_ide_inb(io_ports->feature_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
+		if (valid & IDE_VALID_NSECT)
 			tf->hob_nsect = scc_ide_inb(io_ports->nsect_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
+		if (valid & IDE_VALID_LBAL)
 			tf->hob_lbal  = scc_ide_inb(io_ports->lbal_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
+		if (valid & IDE_VALID_LBAM)
 			tf->hob_lbam  = scc_ide_inb(io_ports->lbam_addr);
-		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
+		if (valid & IDE_VALID_LBAH)
 			tf->hob_lbah  = scc_ide_inb(io_ports->lbah_addr);
 	}
 }
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index bee9461..af8b0f6 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -438,7 +438,7 @@ static void tx4939ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
 {
 	ide_tf_load(drive, cmd);
 
-	if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
+	if (cmd->valid.out.tf & IDE_VALID_DEVICE)
 		tx4939ide_tf_load_fixup(drive);
 }