ide: refactor tf_load() method

Simplify tf_load() method, making it deal only with 'struct ide_taskfile' and
the validity flags that the upper layer passes, and moving the code that deals
with the high order bytes into the only function interested, do_rw_taskfile().

This should stop the needless code duplication in this method and so make
it about twice smaller than it was; along with simplifying the setup for the
method call, this should save both time and space...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

6 files changed, 16 insertions, 49 deletions

diff --git a/drivers/ide/ide-io-std.c b/drivers/ide/ide-io-std.c
index 66c27768e85b..481e221b233d 100644
--- a/drivers/ide/ide-io-std.c
+++ b/drivers/ide/ide-io-std.c
@@ -85,13 +85,11 @@ void ide_dev_select(ide_drive_t *drive)
 }
 EXPORT_SYMBOL_GPL(ide_dev_select);
 
-void ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
+void ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct ide_io_ports *io_ports = &hwif->io_ports;
-	struct ide_taskfile *tf = &cmd->hob;
 	void (*tf_outb)(u8 addr, unsigned long port);
-	u8 valid = cmd->valid.out.hob;
 	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 
 	if (mmio)
@@ -109,20 +107,6 @@ void ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf_outb(tf->lbam, io_ports->lbam_addr);
 	if (valid & IDE_VALID_LBAH)
 		tf_outb(tf->lbah, io_ports->lbah_addr);
-
-	tf = &cmd->tf;
-	valid = cmd->valid.out.tf;
-
-	if (valid & IDE_VALID_FEATURE)
-		tf_outb(tf->feature, io_ports->feature_addr);
-	if (valid & IDE_VALID_NSECT)
-		tf_outb(tf->nsect, io_ports->nsect_addr);
-	if (valid & IDE_VALID_LBAL)
-		tf_outb(tf->lbal, io_ports->lbal_addr);
-	if (valid & IDE_VALID_LBAM)
-		tf_outb(tf->lbam, io_ports->lbam_addr);
-	if (valid & IDE_VALID_LBAH)
-		tf_outb(tf->lbah, io_ports->lbah_addr);
 	if (valid & IDE_VALID_DEVICE)
 		tf_outb(tf->device, io_ports->device_addr);
 }
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 0fdf0dfb5743..6f1ed427a484 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -312,10 +312,10 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+	struct ide_taskfile tf;
 	u16 *id = drive->id, i;
 	int error = 0;
 	u8 stat;
-	struct ide_cmd cmd;
 
 #ifdef CONFIG_BLK_DEV_IDEDMA
 	if (hwif->dma_ops)	/* check if host supports DMA */
@@ -347,12 +347,11 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 	udelay(1);
 	tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
-	cmd.tf.feature = SETFEATURES_XFER;
-	cmd.tf.nsect   = speed;
+	memset(&tf, 0, sizeof(tf));
+	tf.feature = SETFEATURES_XFER;
+	tf.nsect   = speed;
 
-	tp_ops->tf_load(drive, &cmd);
+	tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);
 
 	tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
 
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 6a98d7c1681a..44d7816c1fe9 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -283,13 +283,11 @@ int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
 	 * identify command to be sure of reply
 	 */
 	if (cmd == ATA_CMD_ID_ATAPI) {
-		struct ide_cmd cmd;
+		struct ide_taskfile tf;
 
-		memset(&cmd, 0, sizeof(cmd));
+		memset(&tf, 0, sizeof(tf));
 		/* disable DMA & overlap */
-		cmd.valid.out.tf = IDE_VALID_FEATURE;
-
-		tp_ops->tf_load(drive, &cmd);
+		tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
 	}
 
 	/* ask drive for ID */
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 0318a4cb09de..b1806ed46175 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -98,7 +98,8 @@ ide_startstop_t do_rw_taskfile(ide_drive_t *drive, struct ide_cmd *orig_cmd)
 			cmd->tf.device |= drive->select;
 		}
 
-		tp_ops->tf_load(drive, cmd);
+		tp_ops->tf_load(drive, &cmd->hob, cmd->valid.out.hob);
+		tp_ops->tf_load(drive, &cmd->tf,  cmd->valid.out.tf);
 	}
 
 	switch (cmd->protocol) {
diff --git a/drivers/ide/scc_pata.c b/drivers/ide/scc_pata.c
index feabf5487049..5ecb70cf29dc 100644
--- a/drivers/ide/scc_pata.c
+++ b/drivers/ide/scc_pata.c
@@ -645,25 +645,9 @@ static int __devinit init_setup_scc(struct pci_dev *dev,
 	return rc;
 }
 
-static void scc_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
+static void scc_tf_load(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
 {
 	struct ide_io_ports *io_ports = &drive->hwif->io_ports;
-	struct ide_taskfile *tf = &cmd->hob;
-	u8 valid = cmd->valid.out.hob;
-
-	if (valid & IDE_VALID_FEATURE)
-		scc_ide_outb(tf->feature, io_ports->feature_addr);
-	if (valid & IDE_VALID_NSECT)
-		scc_ide_outb(tf->nsect, io_ports->nsect_addr);
-	if (valid & IDE_VALID_LBAL)
-		scc_ide_outb(tf->lbal, io_ports->lbal_addr);
-	if (valid & IDE_VALID_LBAM)
-		scc_ide_outb(tf->lbam, io_ports->lbam_addr);
-	if (valid & IDE_VALID_LBAH)
-		scc_ide_outb(tf->lbah, io_ports->lbah_addr);
-
-	tf = &cmd->tf;
-	valid = cmd->valid.out.tf;
 
 	if (valid & IDE_VALID_FEATURE)
 		scc_ide_outb(tf->feature, io_ports->feature_addr);
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index af8b0f68d5cf..564422d23976 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -434,11 +434,12 @@ static void tx4939ide_tf_load_fixup(ide_drive_t *drive)
 	tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
 }
 
-static void tx4939ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
+static void tx4939ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf,
+			      u8 valid)
 {
-	ide_tf_load(drive, cmd);
+	ide_tf_load(drive, tf, valid);
 
-	if (cmd->valid.out.tf & IDE_VALID_DEVICE)
+	if (valid & IDE_VALID_DEVICE)
 		tx4939ide_tf_load_fixup(drive);
 }