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, 11 insertions, 10 deletions

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index b66f9d1411b3..07492d71c602 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -17,11 +17,11 @@
  *                 41
  *                 43
  *
- * | PIO 0       | c0 | 80 | 0 |        piix_tune_drive(drive, 0);
- * | PIO 2 | SW2 | d0 | 90 | 4 |        piix_tune_drive(drive, 2);
- * | PIO 3 | MW1 | e1 | a1 | 9 |        piix_tune_drive(drive, 3);
- * | PIO 4 | MW2 | e3 | a3 | b |        piix_tune_drive(drive, 4);
- * 
+ * | PIO 0       | c0 | 80 | 0 |
+ * | PIO 2 | SW2 | d0 | 90 | 4 |
+ * | PIO 3 | MW1 | e1 | a1 | 9 |
+ * | PIO 4 | MW2 | e3 | a3 | b |
+ *
  * sitre = word40 & 0x4000; primary
  * sitre = word42 & 0x4000; secondary
  *
@@ -204,16 +204,16 @@ static void piix_tune_pio (ide_drive_t *drive, u8 pio)
 }
 
 /**
- *      piix_tune_drive         -       tune a drive attached to PIIX
+ *      piix_set_pio_mode       -       set PIO mode
  *      @drive: drive to tune
  *      @pio: desired PIO mode
  *
  *      Set the drive's PIO mode (might be useful if drive is not registered
  *      in CMOS for any reason).
  */
-static void piix_tune_drive (ide_drive_t *drive, u8 pio)
+
+static void piix_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-        pio = ide_get_best_pio_mode(drive, pio, 4);
         piix_tune_pio(drive, pio);
         (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
@@ -317,7 +317,7 @@ static int piix_config_drive_xfer_rate (ide_drive_t *drive)
                 return 0;
 
         if (ide_use_fast_pio(drive))
-                piix_tune_drive(drive, 255);
+                ide_set_max_pio(drive);
 
         return -1;
 }
@@ -454,7 +454,8 @@ static void __devinit init_hwif_piix(ide_hwif_t *hwif)
         }
 
         hwif->autodma = 0;
-        hwif->tuneproc = &piix_tune_drive;
+
+        hwif->set_pio_mode = &piix_set_pio_mode;
         hwif->speedproc = &piix_tune_chipset;
         hwif->drives[0].autotune = 1;
         hwif->drives[1].autotune = 1;