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ide-pmac: PIO mode setup fixes (take 3) 

* Add { 0, 0 } entry to {kauai,shasta}_pio_timings[] so kauai_lookup_timing()
  always returns a valid PIO timing (fixes PIO timing not being set for devices
  with minimum PIO cycle <= 120ns).

* Add setting transfer mode on the device to pmac_ide_set_pio_mode().

* Fix pmac_ide_set_pio() to always program chipset for given PIO timing instead
  of only when the device we want to program PIO timing for is the currently
  selected one.

* Now that pmac_ide_set_pio() is fixed there is no need to set transfer mode
  on the device and program chipset for PIO in pmac_ide_tune_chipset()
  (returning 0 == success is not entirely correct but is OK for now since
  the upper layers are only checking ->speedproc return value for DMA modes).

v2:
* s/speed/XFER_PIO_0 + pio/ in pmac_ide_set_pio_mode() so it actually compiles.

* Removal of kauai_lookup_timing() return value checking went to separate patch.

v3:
* Use XFER_PIO_0 not XFER_PIO. (Noticed by Ben)

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-10-11 23:54:01 +02:00
parent f44ae58a27
commit c15d5d43e6
1 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/ide/ppc/pmac.c
View File

@ -6,6 +6,7 @@
* for doing DMA.
*
* Copyright (C) 1998-2003 Paul Mackerras & Ben. Herrenschmidt
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@ -311,7 +312,8 @@ static struct kauai_timing kauai_pio_timings[] =
{ 240 , 0x0800038b },
{ 239 , 0x0800030c },
{ 180 , 0x05000249 },
{ 120 , 0x04000148 }
{ 120 , 0x04000148 },
{ 0 , 0 },
};
static struct kauai_timing kauai_mdma_timings[] =
@ -351,7 +353,8 @@ static struct kauai_timing shasta_pio_timings[] =
{ 240 , 0x040003cd },
{ 239 , 0x040003cd },
{ 180 , 0x0400028b },
{ 120 , 0x0400010a }
{ 120 , 0x0400010a },
{ 0 , 0 },
};
static struct kauai_timing shasta_mdma_timings[] =
@ -695,8 +698,10 @@ pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
drive->name, pio, *timings);
#endif
if (drive->select.all == HWIF(drive)->INB(IDE_SELECT_REG))
pmac_ide_do_update_timings(drive);
if (pmac_ide_do_setfeature(drive, XFER_PIO_0 + pio))
return;
pmac_ide_do_update_timings(drive);
}
#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
@ -965,7 +970,7 @@ static int pmac_ide_tune_chipset(ide_drive_t *drive, const u8 speed)
case XFER_PIO_1:
case XFER_PIO_0:
pmac_ide_set_pio_mode(drive, speed & 0x07);
break;
return 0;
default:
ret = 1;
}