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, 2 insertions, 4 deletions

diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
index 6c01d951d074..f16521254867 100644
--- a/drivers/ide/legacy/dtc2278.c
+++ b/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;