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>

1 files changed, 13 insertions, 19 deletions

diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index 37ecd726aa40..005402ab748b 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/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
- *
- *	Select the best PIO mode for the drive in question.
- *	Then program the controller for this mode.
+ *	ali_tune_pio	-	set host controller for PIO mode
+ *	@drive: drive
+ *	@pio: PIO mode number
  *
- *	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;