ide: add ide_set{_max}_pio() (take 4)

* Add IDE_HFLAG_ABUSE_{PREFETCH,FAST_DEVSEL,DMA_MODES} flags
  and set them in ht6560, cmd640, cmd64x and sc1200 host drivers.

* Add set_pio_mode_abuse() for checking if host driver has a non-standard
  ->tuneproc() implementation and use it in do_special().

* Add ide_set_pio() for setting PIO mode (it uses hwif->pio_mask to find
  the maximum PIO mode supported by the host), also add ide_set_max_pio()
  wrapper for ide_set_pio() to use for auto-tuning.  Convert users of
  ->tuneproc to use ide_set{_max}_pio() where possible.  This leaves only
  do_special(), set_using_pio(), ide_hwif_restore() and ide_set_pio() as
  a direct users of ->tuneproc.

* Remove no longer needed ide_get_best_pio_mode() calls and printk-s
  reporting PIO mode selected from ->tuneproc implementations.

* Rename ->tuneproc hook to ->set_pio_mode and make 'pio' argument const.

* Remove stale comment from ide_config_drive_speed().

v2:
* Fix "ata_" prefix (Noticed by Jeff).

v3:
* Minor cleanups/fixups per Sergei's suggestions.

v4:
* Fix compile problem in drivers/ide/pci/cmd640.c
  (Noticed by Andrew Morton).

* Improve some ->set_pio_mode comments.

Reviewed-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/cris/ide-cris.c

@@ -680,12 +680,10 @@ static void cris_dma_off(ide_drive_t *drive)
 {
 }
 
-static void tune_cris_ide(ide_drive_t *drive, u8 pio)
+static void cris_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	int setup, strobe, hold;
 
-	pio = ide_get_best_pio_mode(drive, pio, 4);
-
 	switch(pio)
 	{
 		case 0:
@@ -727,7 +725,7 @@ static int speed_cris_ide(ide_drive_t *drive, const u8 speed)
 	int cyc = 0, dvs = 0, strobe = 0, hold = 0;
 
 	if (speed >= XFER_PIO_0 && speed <= XFER_PIO_4) {
-		tune_cris_ide(drive, speed - XFER_PIO_0);
+		cris_set_pio_mode(drive, speed - XFER_PIO_0);
 		return ide_config_drive_speed(drive, speed);
 	}
 
@@ -797,7 +795,7 @@ init_e100_ide (void)
 		ide_register_hw(&hw, 1, &hwif);
 		hwif->mmio = 1;
 		hwif->chipset = ide_etrax100;
-		hwif->tuneproc = &tune_cris_ide;
+		hwif->set_pio_mode = &cris_set_pio_mode;
 		hwif->speedproc = &speed_cris_ide;
 		hwif->ata_input_data = &cris_ide_input_data;
 		hwif->ata_output_data = &cris_ide_output_data;

drivers/ide/ide-io.c

@@ -201,8 +201,7 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
 		return do_rw_taskfile(drive, args);
 
 	case idedisk_pm_restore_pio:	/* Resume step 1 (restore PIO) */
-		if (drive->hwif->tuneproc != NULL)
-			drive->hwif->tuneproc(drive, 255);
+		ide_set_max_pio(drive);
 		/*
 		 * skip idedisk_pm_idle for ATAPI devices
 		 */
@@ -788,6 +787,30 @@ static ide_startstop_t ide_disk_special(ide_drive_t *drive)
 	return ide_started;
 }
 
+/*
+ * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
+ */
+static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
+{
+	switch (req_pio) {
+	case 202:
+	case 201:
+	case 200:
+	case 102:
+	case 101:
+	case 100:
+		return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
+	case 9:
+	case 8:
+		return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
+	case 7:
+	case 6:
+		return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
+	default:
+		return 0;
+	}
+}
+
 /**
  *	do_special		-	issue some special commands
  *	@drive: drive the command is for
@@ -805,9 +828,17 @@ static ide_startstop_t do_special (ide_drive_t *drive)
 	printk("%s: do_special: 0x%02x\n", drive->name, s->all);
 #endif
 	if (s->b.set_tune) {
+		ide_hwif_t *hwif = drive->hwif;
+		u8 req_pio = drive->tune_req;
+
 		s->b.set_tune = 0;
-		if (HWIF(drive)->tuneproc != NULL)
-			HWIF(drive)->tuneproc(drive, drive->tune_req);
+
+		if (set_pio_mode_abuse(drive->hwif, req_pio)) {
+			if (hwif->set_pio_mode)
+				hwif->set_pio_mode(drive, req_pio);
+		} else
+			ide_set_pio(drive, req_pio);
+
 		return ide_stopped;
 	} else {
 		if (drive->media == ide_disk)

drivers/ide/ide-iops.c

@@ -780,12 +780,6 @@ int ide_driveid_update (ide_drive_t *drive)
 
 /*
  * Similar to ide_wait_stat(), except it never calls ide_error internally.
- * This is a kludge to handle the new ide_config_drive_speed() function,
- * and should not otherwise be used anywhere.  Eventually, the tuneproc's
- * should be updated to return ide_startstop_t, in which case we can get
- * rid of this abomination again.  :)   -ml
- *
- * It is gone..........
  *
  * const char *msg == consider adding for verbose errors.
  */

drivers/ide/ide-lib.c

@@ -325,6 +325,35 @@ u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
 
 EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
 
+/* req_pio == "255" for auto-tune */
+void ide_set_pio(ide_drive_t *drive, u8 req_pio)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 host_pio, pio;
+
+	if (hwif->set_pio_mode == NULL)
+		return;
+
+	BUG_ON(hwif->pio_mask == 0x00);
+
+	host_pio = fls(hwif->pio_mask) - 1;
+
+	pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
+
+	/*
+	 * TODO:
+	 * - report device max PIO mode
+	 * - check req_pio != 255 against device max PIO mode
+	 */
+	printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
+			  drive->name, host_pio, req_pio,
+			  req_pio == 255 ? "(auto-tune)" : "", pio);
+
+	hwif->set_pio_mode(drive, pio);
+}
+
+EXPORT_SYMBOL_GPL(ide_set_pio);
+
 /**
  *	ide_toggle_bounce	-	handle bounce buffering
  *	@drive: drive to update

drivers/ide/ide-probe.c

@@ -827,10 +827,8 @@ static void probe_hwif(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
 		ide_drive_t *drive = &hwif->drives[unit];
 
 		if (drive->present) {
-			if (hwif->tuneproc != NULL && 
-				drive->autotune == IDE_TUNE_AUTO)
-				/* auto-tune PIO mode */
-				hwif->tuneproc(drive, 255);
+			if (drive->autotune == IDE_TUNE_AUTO)
+				ide_set_max_pio(drive);
 
 			if (drive->autotune != IDE_TUNE_DEFAULT &&
 			    drive->autotune != IDE_TUNE_AUTO)

drivers/ide/ide.c

@@ -396,7 +396,7 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 	hwif->cds			= tmp_hwif->cds;
 #endif
 
-	hwif->tuneproc			= tmp_hwif->tuneproc;
+	hwif->set_pio_mode		= tmp_hwif->set_pio_mode;
 	hwif->speedproc			= tmp_hwif->speedproc;
 	hwif->mdma_filter		= tmp_hwif->mdma_filter;
 	hwif->udma_filter		= tmp_hwif->udma_filter;
@@ -867,8 +867,9 @@ int set_pio_mode(ide_drive_t *drive, int arg)
 	if (arg < 0 || arg > 255)
 		return -EINVAL;
 
-	if (!HWIF(drive)->tuneproc)
+	if (drive->hwif->set_pio_mode == NULL)
 		return -ENOSYS;
+
 	if (drive->special.b.set_tune)
 		return -EBUSY;
 	ide_init_drive_cmd(&rq);

drivers/ide/legacy/ali14xx.c

@@ -68,8 +68,6 @@ static RegInitializer initData[] __initdata = {
 	{0x35, 0x03}, {0x00, 0x00}
 };
 
-#define ALI_MAX_PIO 4
-
 /* timing parameter registers for each drive */
 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
 	{0x03, 0x26, 0x04, 0x27},     /* drive 0 */
@@ -109,7 +107,7 @@ static void outReg (u8 data, u8 reg)
  * This function computes timing parameters
  * and sets controller registers accordingly.
  */
-static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
+static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	int driveNum;
 	int time1, time2;
@@ -117,8 +115,6 @@ static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
 	unsigned long flags;
 	int bus_speed = system_bus_clock();
 
-	pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO);
-
 	/* calculate timing, according to PIO mode */
 	time1 = ide_pio_cycle_time(drive, pio);
 	time2 = ide_pio_timings[pio].active_time;
@@ -212,12 +208,12 @@ static int __init ali14xx_probe(void)
 
 	hwif->chipset = ide_ali14xx;
 	hwif->pio_mask = ATA_PIO4;
-	hwif->tuneproc = &ali14xx_tune_drive;
+	hwif->set_pio_mode = &ali14xx_set_pio_mode;
 	hwif->mate = mate;
 
 	mate->chipset = ide_ali14xx;
 	mate->pio_mask = ATA_PIO4;
-	mate->tuneproc = &ali14xx_tune_drive;
+	mate->set_pio_mode = &ali14xx_set_pio_mode;
 	mate->mate = hwif;
 	mate->channel = 1;
 

drivers/ide/legacy/dtc2278.c

@@ -67,12 +67,10 @@ static void sub22 (char b, char c)
 	}
 }
 
-static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
+static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	unsigned long flags;
 
-	pio = ide_get_best_pio_mode(drive, pio, 4);
-
 	if (pio >= 3) {
 		spin_lock_irqsave(&ide_lock, flags);
 		/*
@@ -124,7 +122,7 @@ static int __init dtc2278_probe(void)
 	hwif->serialized = 1;
 	hwif->chipset = ide_dtc2278;
 	hwif->pio_mask = ATA_PIO4;
-	hwif->tuneproc = &tune_dtc2278;
+	hwif->set_pio_mode = &dtc2278_set_pio_mode;
 	hwif->drives[0].no_unmask = 1;
 	hwif->drives[1].no_unmask = 1;
 	hwif->mate = mate;

drivers/ide/legacy/ht6560b.c

@@ -199,7 +199,7 @@ static int __init try_to_init_ht6560b(void)
 	return 1;
 }
 
-static u8 ht_pio2timings(ide_drive_t *drive, u8 pio)
+static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
 {
 	int active_time, recovery_time;
 	int active_cycles, recovery_cycles;
@@ -208,7 +208,6 @@ static u8 ht_pio2timings(ide_drive_t *drive, u8 pio)
         if (pio) {
 		unsigned int cycle_time;
 
-		pio = ide_get_best_pio_mode(drive, pio, 5);
 		cycle_time = ide_pio_cycle_time(drive, pio);
 
 		/*
@@ -277,7 +276,7 @@ static void ht_set_prefetch(ide_drive_t *drive, u8 state)
 #endif
 }
 
-static void tune_ht6560b (ide_drive_t *drive, u8 pio)
+static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	unsigned long flags;
 	u8 timing;
@@ -333,15 +332,17 @@ int __init ht6560b_init(void)
 
 	hwif->chipset = ide_ht6560b;
 	hwif->selectproc = &ht6560b_selectproc;
+	hwif->host_flags = IDE_HFLAG_ABUSE_PREFETCH;
 	hwif->pio_mask = ATA_PIO5;
-	hwif->tuneproc = &tune_ht6560b;
+	hwif->set_pio_mode = &ht6560b_set_pio_mode;
 	hwif->serialized = 1;	/* is this needed? */
 	hwif->mate = mate;
 
 	mate->chipset = ide_ht6560b;
 	mate->selectproc = &ht6560b_selectproc;
+	mate->host_flags = IDE_HFLAG_ABUSE_PREFETCH;
 	mate->pio_mask = ATA_PIO5;
-	mate->tuneproc = &tune_ht6560b;
+	mate->set_pio_mode = &ht6560b_set_pio_mode;
 	mate->serialized = 1;	/* is this needed? */
 	mate->mate = hwif;
 	mate->channel = 1;

drivers/ide/legacy/qd65xx.c

@@ -224,15 +224,14 @@ static void qd_set_timing (ide_drive_t *drive, u8 timing)
 	printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 }
 
-/*
- * qd6500_tune_drive
- */
-
-static void qd6500_tune_drive (ide_drive_t *drive, u8 pio)
+static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	int active_time   = 175;
 	int recovery_time = 415; /* worst case values from the dos driver */
 
+	/*
+	 * FIXME: use "pio" value
+	 */
 	if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
 		&& drive->id->tPIO && (drive->id->field_valid & 0x02)
 		&& drive->id->eide_pio >= 240) {
@@ -246,11 +245,7 @@ static void qd6500_tune_drive (ide_drive_t *drive, u8 pio)
 	qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 }
 
-/*
- * qd6580_tune_drive
- */
-
-static void qd6580_tune_drive (ide_drive_t *drive, u8 pio)
+static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	int base = HWIF(drive)->select_data;
 	unsigned int cycle_time;
@@ -258,7 +253,6 @@ static void qd6580_tune_drive (ide_drive_t *drive, u8 pio)
 	int recovery_time = 415; /* worst case values from the dos driver */
 
 	if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
-		pio = ide_get_best_pio_mode(drive, pio, 4);
 		cycle_time = ide_pio_cycle_time(drive, pio);
 
 		switch (pio) {
@@ -335,8 +329,7 @@ static int __init qd_testreg(int port)
  */
 
 static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
-			    unsigned int data0, unsigned int data1,
-			    void (*tuneproc) (ide_drive_t *, u8 pio))
+			    unsigned int data0, unsigned int data1)
 {
 	hwif->chipset = ide_qd65xx;
 	hwif->channel = hwif->index;
@@ -347,8 +340,6 @@ static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
 	hwif->drives[0].io_32bit =
 	hwif->drives[1].io_32bit = 1;
 	hwif->pio_mask = ATA_PIO4;
-	hwif->tuneproc = tuneproc;
-	probe_hwif_init(hwif);
 }
 
 /*
@@ -361,7 +352,7 @@ static void __exit qd_unsetup(ide_hwif_t *hwif)
 {
 	u8 config = hwif->config_data;
 	int base = hwif->select_data;
-	void *tuneproc = (void *) hwif->tuneproc;
+	void *set_pio_mode = (void *)hwif->set_pio_mode;
 
 	if (hwif->chipset != ide_qd65xx)
 		return;
@@ -369,12 +360,12 @@ static void __exit qd_unsetup(ide_hwif_t *hwif)
 	printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);
 
 	hwif->selectproc = NULL;
-	hwif->tuneproc = NULL;
+	hwif->set_pio_mode = NULL;
 
-	if (tuneproc == (void *) qd6500_tune_drive) {
+	if (set_pio_mode == (void *)qd6500_set_pio_mode) {
 		// will do it for both
 		qd_write_reg(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
-	} else if (tuneproc == (void *) qd6580_tune_drive) {
+	} else if (set_pio_mode == (void *)qd6580_set_pio_mode) {
 		if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
 			qd_write_reg(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 			qd_write_reg(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
@@ -424,8 +415,11 @@ static int __init qd_probe(int base)
 			return 1;
 		}
 
-		qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA,
-			 &qd6500_tune_drive);
+		qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA);
+
+		hwif->set_pio_mode = &qd6500_set_pio_mode;
+
+		probe_hwif_init(hwif);
 
 		ide_proc_register_port(hwif);
 
@@ -455,8 +449,12 @@ static int __init qd_probe(int base)
 			printk(KERN_INFO "%s: qd6580: single IDE board\n",
 					 hwif->name);
 			qd_setup(hwif, base, config | (control << 8),
-				 QD6580_DEF_DATA, QD6580_DEF_DATA2,
-				 &qd6580_tune_drive);
+				 QD6580_DEF_DATA, QD6580_DEF_DATA2);
+
+			hwif->set_pio_mode = &qd6580_set_pio_mode;
+
+			probe_hwif_init(hwif);
+
 			qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
 
 			ide_proc_register_port(hwif);
@@ -472,11 +470,19 @@ static int __init qd_probe(int base)
 					hwif->name, mate->name);
 
 			qd_setup(hwif, base, config | (control << 8),
-				 QD6580_DEF_DATA, QD6580_DEF_DATA,
-				 &qd6580_tune_drive);
+				 QD6580_DEF_DATA, QD6580_DEF_DATA);
+
+			hwif->set_pio_mode = &qd6580_set_pio_mode;
+
+			probe_hwif_init(hwif);
+
 			qd_setup(mate, base, config | (control << 8),
-				 QD6580_DEF_DATA2, QD6580_DEF_DATA2,
-				 &qd6580_tune_drive);
+				 QD6580_DEF_DATA2, QD6580_DEF_DATA2);
+
+			mate->set_pio_mode = &qd6580_set_pio_mode;
+
+			probe_hwif_init(mate);
+
 			qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
 
 			ide_proc_register_port(hwif);

drivers/ide/legacy/umc8672.c

@@ -105,12 +105,11 @@ static void umc_set_speeds (u8 speeds[])
 		speeds[0], speeds[1], speeds[2], speeds[3]);
 }
 
-static void tune_umc (ide_drive_t *drive, u8 pio)
+static void umc_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	unsigned long flags;
 	ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
 
-	pio = ide_get_best_pio_mode(drive, pio, 4);
 	printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
 		drive->name, pio, pio_to_umc[pio]);
 	spin_lock_irqsave(&ide_lock, flags);
@@ -150,12 +149,12 @@ static int __init umc8672_probe(void)
 
 	hwif->chipset = ide_umc8672;
 	hwif->pio_mask = ATA_PIO4;
-	hwif->tuneproc = &tune_umc;
+	hwif->set_pio_mode = &umc_set_pio_mode;
 	hwif->mate = mate;
 
 	mate->chipset = ide_umc8672;
 	mate->pio_mask = ATA_PIO4;
-	mate->tuneproc = &tune_umc;
+	mate->set_pio_mode = &umc_set_pio_mode;
 	mate->mate = hwif;
 	mate->channel = 1;
 

drivers/ide/mips/au1xxx-ide.c

@@ -99,18 +99,12 @@ void auide_outsw(unsigned long port, void *addr, u32 count)
 
 #endif
 
-static void auide_tune_drive(ide_drive_t *drive, byte pio)
+static void au1xxx_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	int mem_sttime;
 	int mem_stcfg;
 	u8 speed;
 
-	/* get the best pio mode for the drive */
-	pio = ide_get_best_pio_mode(drive, pio, 4);
-
-	printk(KERN_INFO "%s: setting Au1XXX IDE to PIO mode%d\n",
-	       drive->name, pio);
-
 	mem_sttime = 0;
 	mem_stcfg  = au_readl(MEM_STCFG2);
 
@@ -184,7 +178,7 @@ static int auide_tune_chipset(ide_drive_t *drive, const u8 speed)
 	mem_stcfg  = au_readl(MEM_STCFG2);
 
 	if (speed >= XFER_PIO_0 && speed <= XFER_PIO_4) {
-		auide_tune_drive(drive, speed - XFER_PIO_0);
+		au1xxx_set_pio_mode(drive, speed - XFER_PIO_0);
 		return 0;
 	}
 
@@ -712,7 +706,7 @@ static int au_ide_probe(struct device *dev)
 	hwif->OUTSW                     = auide_outsw;
 #endif
 
-	hwif->tuneproc                  = &auide_tune_drive;
+	hwif->set_pio_mode		= &au1xxx_set_pio_mode;
 	hwif->speedproc                 = &auide_tune_chipset;
 
 #ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA

drivers/ide/pci/aec62xx.c

@@ -138,9 +138,8 @@ static int aec6260_tune_chipset(ide_drive_t *drive, const u8 speed)
 	return(ide_config_drive_speed(drive, speed));
 }
 
-static void aec62xx_tune_drive (ide_drive_t *drive, u8 pio)
+static void aec_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	pio = ide_get_best_pio_mode(drive, pio, 4);
 	(void) HWIF(drive)->speedproc(drive, pio + XFER_PIO_0);
 }
 
@@ -150,7 +149,7 @@ static int aec62xx_config_drive_xfer_rate (ide_drive_t *drive)
 		return 0;
 
 	if (ide_use_fast_pio(drive))
-		aec62xx_tune_drive(drive, 255);
+		ide_set_max_pio(drive);
 
 	return -1;
 }
@@ -201,7 +200,7 @@ static void __devinit init_hwif_aec62xx(ide_hwif_t *hwif)
 	u8 reg54 = 0,  mask	= hwif->channel ? 0xf0 : 0x0f;
 	unsigned long flags;
 
-	hwif->tuneproc = &aec62xx_tune_drive;
+	hwif->set_pio_mode = &aec_set_pio_mode;
 
 	if (dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) {
 		if(hwif->mate)

drivers/ide/pci/alim15x3.c

@@ -283,17 +283,14 @@ static int ali_get_info (char *buffer, char **addr, off_t offset, int count)
 #endif  /* defined(DISPLAY_ALI_TIMINGS) && defined(CONFIG_IDE_PROC_FS) */
 
 /**
- *	ali15x3_tune_pio	-	set up chipset for PIO mode
- *	@drive: drive to tune
- *	@pio: desired mode
+ *	ali_tune_pio	-	set host controller for PIO mode
+ *	@drive: drive
+ *	@pio: PIO mode number
  *
- *	Select the best PIO mode for the drive in question.
- *	Then program the controller for this mode.
- *
- *	Returns the PIO mode programmed.
+ *	Program the controller for the given PIO mode.
  */
- 
-static u8 ali15x3_tune_pio (ide_drive_t *drive, u8 pio)
+
+static void ali_tune_pio(ide_drive_t *drive, const u8 pio)
 {
 	ide_hwif_t *hwif = HWIF(drive);
 	struct pci_dev *dev = hwif->pci_dev;
@@ -306,7 +303,6 @@ static u8 ali15x3_tune_pio (ide_drive_t *drive, u8 pio)
 	u8 cd_dma_fifo = 0;
 	int unit = drive->select.b.unit & 1;
 
-	pio = ide_get_best_pio_mode(drive, pio, 5);
 	s_time = ide_pio_timings[pio].setup_time;
 	a_time = ide_pio_timings[pio].active_time;
 	if ((s_clc = (s_time * bus_speed + 999) / 1000) >= 8)
@@ -359,22 +355,20 @@ static u8 ali15x3_tune_pio (ide_drive_t *drive, u8 pio)
 	 * { 25,   70,     25  },   PIO Mode 4 with IORDY  ns
 	 * { 20,   50,     30  }    PIO Mode 5 with IORDY (nonstandard)
 	 */
-
-	return pio;
 }
 
 /**
- *	ali15x3_tune_drive	-	set up drive for PIO mode
+ *	ali_set_pio_mode	-	set up drive for PIO mode
  *	@drive: drive to tune
  *	@pio: desired mode
  *
- *	Program the controller with the best PIO timing for the given drive.
+ *	Program the controller with the desired PIO timing for the given drive.
  *	Then set up the drive itself.
  */
 
-static void ali15x3_tune_drive (ide_drive_t *drive, u8 pio)
+static void ali_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	pio = ali15x3_tune_pio(drive, pio);
+	ali_tune_pio(drive, pio);
 	(void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
 
@@ -437,7 +431,7 @@ static int ali15x3_tune_chipset(ide_drive_t *drive, const u8 speed)
 		pci_write_config_byte(dev, m5229_udma, tmpbyte);
 
 		if (speed < XFER_SW_DMA_0)
-			(void) ali15x3_tune_pio(drive, speed - XFER_PIO_0);
+			ali_tune_pio(drive, speed - XFER_PIO_0);
 	} else {
 		pci_read_config_byte(dev, m5229_udma, &tmpbyte);
 		tmpbyte &= (0x0f << ((1-unit) << 2));
@@ -470,7 +464,7 @@ static int ali15x3_config_drive_for_dma(ide_drive_t *drive)
 	if (ide_tune_dma(drive))
 		return 0;
 
-	ali15x3_tune_drive(drive, 255);
+	ide_set_max_pio(drive);
 
 	return -1;
 }
@@ -700,7 +694,7 @@ static u8 __devinit ata66_ali15x3(ide_hwif_t *hwif)
 static void __devinit init_hwif_common_ali15x3 (ide_hwif_t *hwif)
 {
 	hwif->autodma = 0;
-	hwif->tuneproc = &ali15x3_tune_drive;
+	hwif->set_pio_mode = &ali_set_pio_mode;
 	hwif->speedproc = &ali15x3_tune_chipset;
 	hwif->udma_filter = &ali_udma_filter;
 

drivers/ide/pci/amd74xx.c

@@ -266,16 +266,12 @@ static int amd_set_drive(ide_drive_t *drive, const u8 speed)
 }
 
 /*
- * amd74xx_tune_drive() is a callback from upper layers for
- * PIO-only tuning.
+ * amd_set_pio_mode() is a callback from upper layers for PIO-only tuning.
  */
 
-static void amd74xx_tune_drive(ide_drive_t *drive, u8 pio)
+static void amd_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	if (pio == 255)
-		pio = ide_get_best_pio_mode(drive, 255, 5);
-
-	amd_set_drive(drive, XFER_PIO_0 + min_t(byte, pio, 5));
+	amd_set_drive(drive, XFER_PIO_0 + pio);
 }
 
 static int amd74xx_ide_dma_check(ide_drive_t *drive)
@@ -283,7 +279,7 @@ static int amd74xx_ide_dma_check(ide_drive_t *drive)
 	u8 speed = ide_max_dma_mode(drive);
 
 	if (speed == 0) {
-		amd74xx_tune_drive(drive, 255);
+		ide_set_max_pio(drive);
 		return -1;
 	}
 
@@ -409,7 +405,7 @@ static void __devinit init_hwif_amd74xx(ide_hwif_t *hwif)
 
 	hwif->autodma = 0;
 
-	hwif->tuneproc = &amd74xx_tune_drive;
+	hwif->set_pio_mode = &amd_set_pio_mode;
 	hwif->speedproc = &amd_set_drive;
 
 	for (i = 0; i < 2; i++) {

drivers/ide/pci/atiixp.c

@@ -153,9 +153,8 @@ static void atiixp_tune_pio(ide_drive_t *drive, u8 pio)
 	spin_unlock_irqrestore(&atiixp_lock, flags);
 }
 
-static void atiixp_tuneproc(ide_drive_t *drive, u8 pio)
+static void atiixp_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	pio = ide_get_best_pio_mode(drive, pio, 4);
 	atiixp_tune_pio(drive, pio);
 	(void)ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
@@ -231,7 +230,7 @@ static int atiixp_dma_check(ide_drive_t *drive)
 		return 0;
 
 	if (ide_use_fast_pio(drive))
-		atiixp_tuneproc(drive, 255);
+		ide_set_max_pio(drive);
 
 	return -1;
 }
@@ -254,7 +253,7 @@ static void __devinit init_hwif_atiixp(ide_hwif_t *hwif)
 		hwif->irq = ch ? 15 : 14;
 
 	hwif->autodma = 0;
-	hwif->tuneproc = &atiixp_tuneproc;
+	hwif->set_pio_mode = &atiixp_set_pio_mode;
 	hwif->speedproc = &atiixp_speedproc;
 	hwif->drives[0].autotune = 1;
 	hwif->drives[1].autotune = 1;

drivers/ide/pci/cmd640.c

@@ -628,45 +628,40 @@ static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle
 	program_drive_counts (index);
 }
 
-/*
- * Drive PIO mode selection:
- */
-static void cmd640_tune_drive (ide_drive_t *drive, u8 mode_wanted)
+static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	unsigned int index = 0, cycle_time;
 	u8 b;
 
 	while (drive != cmd_drives[index]) {
 		if (++index > 3) {
-			printk("%s: bad news in cmd640_tune_drive\n", drive->name);
+			printk(KERN_ERR "%s: bad news in %s\n",
+					drive->name, __FUNCTION__);
 			return;
 		}
 	}
-	switch (mode_wanted) {
+	switch (pio) {
 		case 6: /* set fast-devsel off */
 		case 7: /* set fast-devsel on */
-			mode_wanted &= 1;
 			b = get_cmd640_reg(CNTRL) & ~0x27;
-			if (mode_wanted)
+			if (pio & 1)
 				b |= 0x27;
 			put_cmd640_reg(CNTRL, b);
-			printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis");
+			printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, (pio & 1) ? "en" : "dis");
 			return;
 
 		case 8: /* set prefetch off */
 		case 9: /* set prefetch on */
-			mode_wanted &= 1;
-			set_prefetch_mode(index, mode_wanted);
-			printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis");
+			set_prefetch_mode(index, pio & 1);
+			printk("%s: %sabled cmd640 prefetch\n", drive->name, (pio & 1) ? "en" : "dis");
 			return;
 	}
 
-	mode_wanted = ide_get_best_pio_mode(drive, mode_wanted, 5);
-	cycle_time = ide_pio_cycle_time(drive, mode_wanted);
-	cmd640_set_mode(index, mode_wanted, cycle_time);
+	cycle_time = ide_pio_cycle_time(drive, pio);
+	cmd640_set_mode(index, pio, cycle_time);
 
 	printk("%s: selected cmd640 PIO mode%d (%dns)",
-		drive->name, mode_wanted, cycle_time);
+		drive->name, pio, cycle_time);
 
 	display_clocks(index);
 }
@@ -766,8 +761,10 @@ int __init ide_probe_for_cmd640x (void)
 	       cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
 	cmd_hwif0->chipset = ide_cmd640;
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
+	cmd_hwif0->host_flags = IDE_HFLAG_ABUSE_PREFETCH |
+				IDE_HFLAG_ABUSE_FAST_DEVSEL;
 	cmd_hwif0->pio_mask = ATA_PIO5;
-	cmd_hwif0->tuneproc = &cmd640_tune_drive;
+	cmd_hwif0->set_pio_mode = &cmd640_set_pio_mode;
 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
 
 	/*
@@ -822,8 +819,10 @@ int __init ide_probe_for_cmd640x (void)
 		cmd_hwif1->mate = cmd_hwif0;
 		cmd_hwif1->channel = 1;
 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
+		cmd_hwif1->host_flags = IDE_HFLAG_ABUSE_PREFETCH |
+					IDE_HFLAG_ABUSE_FAST_DEVSEL;
 		cmd_hwif1->pio_mask = ATA_PIO5;
-		cmd_hwif1->tuneproc = &cmd640_tune_drive;
+		cmd_hwif1->set_pio_mode = &cmd640_set_pio_mode;
 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
 	}
 	printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,

drivers/ide/pci/cmd64x.c

@@ -214,28 +214,25 @@ static void program_cycle_times (ide_drive_t *drive, int cycle_time, int active_
 }
 
 /*
- * This routine selects drive's best PIO mode and writes into the chipset
- * registers setup/active/recovery timings.
+ * This routine writes into the chipset registers
+ * PIO setup/active/recovery timings.
  */
-static u8 cmd64x_tune_pio (ide_drive_t *drive, u8 mode_wanted)
+static void cmd64x_tune_pio(ide_drive_t *drive, const u8 pio)
 {
 	ide_hwif_t *hwif	= HWIF(drive);
 	struct pci_dev *dev	= hwif->pci_dev;
 	unsigned int cycle_time;
-	u8 pio_mode, setup_count, arttim = 0;
+	u8 setup_count, arttim = 0;
+
 	static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
 	static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
 
-	pio_mode = ide_get_best_pio_mode(drive, mode_wanted, 5);
-	cycle_time = ide_pio_cycle_time(drive, pio_mode);
-
-	cmdprintk("%s: PIO mode wanted %d, selected %d (%d ns)\n",
-		  drive->name, mode_wanted, pio_mode, cycle_time);
+	cycle_time = ide_pio_cycle_time(drive, pio);
 
 	program_cycle_times(drive, cycle_time,
-			    ide_pio_timings[pio_mode].active_time);
+			    ide_pio_timings[pio].active_time);
 
-	setup_count = quantize_timing(ide_pio_timings[pio_mode].setup_time,
+	setup_count = quantize_timing(ide_pio_timings[pio].setup_time,
 				      1000 / system_bus_clock());
 
 	/*
@@ -266,16 +263,14 @@ static u8 cmd64x_tune_pio (ide_drive_t *drive, u8 mode_wanted)
 	arttim |= setup_values[setup_count];
 	(void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
 	cmdprintk("Write 0x%02x to reg 0x%x\n", arttim, arttim_regs[drive->dn]);
-
-	return pio_mode;
 }
 
 /*
  * Attempts to set drive's PIO mode.
- * Special cases are 8: prefetch off, 9: prefetch on (both never worked),
- * and 255: auto-select best mode (used at boot time).
+ * Special cases are 8: prefetch off, 9: prefetch on (both never worked)
  */
-static void cmd64x_tune_drive (ide_drive_t *drive, u8 pio)
+
+static void cmd64x_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
 	/*
 	 * Filter out the prefetch control values
@@ -284,7 +279,7 @@ static void cmd64x_tune_drive (ide_drive_t *drive, u8 pio)
 	if (pio == 8 || pio == 9)
 		return;
 
-	pio = cmd64x_tune_pio(drive, pio);
+	cmd64x_tune_pio(drive, pio);
 	(void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
 
@@ -334,7 +329,7 @@ static int cmd64x_tune_chipset(ide_drive_t *drive, const u8 speed)
 	case XFER_PIO_2:
 	case XFER_PIO_1:
 	case XFER_PIO_0:
-		(void) cmd64x_tune_pio(drive, speed - XFER_PIO_0);
+		cmd64x_tune_pio(drive, speed - XFER_PIO_0);
 		break;
 	default:
 		return 1;
@@ -352,7 +347,7 @@ static int cmd64x_config_drive_for_dma (ide_drive_t *drive)
 		return 0;
 
 	if (ide_use_fast_pio(drive))
-		cmd64x_tune_drive(drive, 255);
+		ide_set_max_pio(drive);
 
 	return -1;
 }
@@ -536,7 +531,7 @@ static void __devinit init_hwif_cmd64x(ide_hwif_t *hwif)
 
 	pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
 
-	hwif->tuneproc  = &cmd64x_tune_drive;
+	hwif->set_pio_mode = &cmd64x_set_pio_mode;
 	hwif->speedproc = &cmd64x_tune_chipset;
 
 	hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
@@ -620,6 +615,7 @@ static ide_pci_device_t cmd64x_chipsets[] __devinitdata = {
 		.autodma	= AUTODMA,
 		.enablebits	= {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
 		.bootable	= ON_BOARD,
+		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.udma_mask	= 0x00, /* no udma */
 	},{	/* 1 */
@@ -630,6 +626,7 @@ static ide_pci_device_t cmd64x_chipsets[] __devinitdata = {
 		.autodma	= AUTODMA,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.bootable	= ON_BOARD,
+		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.udma_mask	= 0x07, /* udma0-2 */
 	},{	/* 2 */
@@ -640,6 +637,7 @@ static ide_pci_device_t cmd64x_chipsets[] __devinitdata = {
 		.autodma	= AUTODMA,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.bootable	= ON_BOARD,
+		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.udma_mask	= 0x1f, /* udma0-4 */
 	},{	/* 3 */
@@ -650,6 +648,7 @@ static ide_pci_device_t cmd64x_chipsets[] __devinitdata = {
 		.autodma	= AUTODMA,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.bootable	= ON_BOARD,
+		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.udma_mask	= 0x3f, /* udma0-5 */
 	}

drivers/ide/pci/cs5520.c

@@ -122,17 +122,16 @@ static int cs5520_tune_chipset(ide_drive_t *drive, const u8 speed)
 
 	return error;
 }	
-	
-static void cs5520_tune_drive(ide_drive_t *drive, u8 pio)
+
+static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	pio = ide_get_best_pio_mode(drive, pio, 4);
-	cs5520_tune_chipset(drive, (XFER_PIO_0 + pio));
+	cs5520_tune_chipset(drive, XFER_PIO_0 + pio);
 }
 
 static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
 {
 	/* Tune the drive for PIO modes up to PIO 4 */	
-	cs5520_tune_drive(drive, 255);
+	ide_set_max_pio(drive);
 
 	/* Then tell the core to use DMA operations */
 	return 0;
@@ -164,7 +163,7 @@ static int cs5520_dma_on(ide_drive_t *drive)
 
 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
 {
-	hwif->tuneproc = &cs5520_tune_drive;
+	hwif->set_pio_mode = &cs5520_set_pio_mode;
 	hwif->speedproc = &cs5520_tune_chipset;
 	hwif->ide_dma_check = &cs5520_config_drive_xfer_rate;
 	hwif->ide_dma_on = &cs5520_dma_on;

drivers/ide/pci/cs5530.c

@@ -71,19 +71,18 @@ static void cs5530_tunepio(ide_drive_t *drive, u8 pio)
 }
 
 /**
- *	cs5530_tuneproc		-	select/set PIO modes
+ *	cs5530_set_pio_mode	-	set PIO mode
+ *	@drive: drive
+ *	@pio: PIO mode number
  *
- *	cs5530_tuneproc() handles selection/setting of PIO modes
- *	for both the chipset and drive.
+ *	Handles setting of PIO mode for both the chipset and drive.
  *
- *	The ide_init_cs5530() routine guarantees that all drives
+ *	The init_hwif_cs5530() routine guarantees that all drives
  *	will have valid default PIO timings set up before we get here.
  */
 
-static void cs5530_tuneproc (ide_drive_t *drive, u8 pio)	/* pio=255 means "autotune" */
+static void cs5530_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-	pio = ide_get_best_pio_mode(drive, pio, 4);
-
 	if (cs5530_set_xfer_mode(drive, XFER_PIO_0 + pio) == 0)
 		cs5530_tunepio(drive, pio);
 }
@@ -306,7 +305,7 @@ static void __devinit init_hwif_cs5530 (ide_hwif_t *hwif)
 	if (hwif->mate)
 		hwif->serialized = hwif->mate->serialized = 1;
 
-	hwif->tuneproc = &cs5530_tuneproc;
+	hwif->set_pio_mode = &cs5530_set_pio_mode;
 	hwif->speedproc = &cs5530_tune_chipset;
 
 	basereg = CS5530_BASEREG(hwif);