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, 3 insertions, 2 deletions

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 9fdc1fe1b299..e96212ce5729 100644
--- a/drivers/ide/ide.c
+++ b/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);