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ide-pmac: fix set_timings_mdma() 

* Move adjusting of cycle time for devices providing explicit DMA cycle time
  from pmac_ide_mdma_enable() to set_timings_mdma().

* Remove no longer needed drive_cycle_time argument.

* BUG() if unsupported speed argument value is passed (shouldn't happen).

* Matching access/recovery timings always exist so remove redundant check.

* Make set_timings_mdma() void.

* Update pmac_ide_tune_chipset()'s comment.

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-10-13 17:47:48 +02:00
parent 085798b12f
commit 90f72eca36
1 changed files with 12 additions and 28 deletions
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40
drivers/ide/ppc/pmac.c
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@ -770,12 +770,13 @@ set_timings_udma_shasta(u32 *pio_timings, u32 *ultra_timings, u8 speed)
/*
* Calculate MDMA timings for all cells
*/
static int
static void
set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
u8 speed, int drive_cycle_time)
u8 speed)
{
int cycleTime, accessTime = 0, recTime = 0;
unsigned accessTicks, recTicks;
struct hd_driveid *id = drive->id;
struct mdma_timings_t* tm = NULL;
int i;
@ -785,11 +786,14 @@ set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
case 1: cycleTime = 150; break;
case 2: cycleTime = 120; break;
default:
return 1;
BUG();
break;
}
/* Adjust for drive */
if (drive_cycle_time && drive_cycle_time > cycleTime)
cycleTime = drive_cycle_time;
/* Check if drive provides explicit DMA cycle time */
if ((id->field_valid & 2) && id->eide_dma_time)
cycleTime = max_t(int, id->eide_dma_time, cycleTime);
/* OHare limits according to some old Apple sources */
if ((intf_type == controller_ohare) && (cycleTime < 150))
cycleTime = 150;
@ -817,8 +821,6 @@ set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
break;
i++;
}
if (i < 0)
return 1;
cycleTime = tm[i].cycleTime;
accessTime = tm[i].accessTime;
recTime = tm[i].recoveryTime;
@ -900,16 +902,12 @@ set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
printk(KERN_ERR "%s: Set MDMA timing for mode %d, reg: 0x%08x\n",
drive->name, speed & 0xf, *timings);
#endif
return 0;
}
#endif /* #ifdef CONFIG_BLK_DEV_IDEDMA_PMAC */
/*
* Speedproc. This function is called by the core to set any of the standard
* DMA timing (MDMA or UDMA) to both the drive and the controller.
* You may notice we don't use this function on normal "dma check" operation,
* our dedicated function is more precise as it uses the drive provided
* cycle time value. We should probably fix this one to deal with that too...
*/
static int pmac_ide_tune_chipset(ide_drive_t *drive, const u8 speed)
{
@ -947,7 +945,7 @@ static int pmac_ide_tune_chipset(ide_drive_t *drive, const u8 speed)
case XFER_MW_DMA_2:
case XFER_MW_DMA_1:
case XFER_MW_DMA_0:
ret = set_timings_mdma(drive, pmif->kind, &tl[0], &tl[1], speed, 0);
set_timings_mdma(drive, pmif->kind, &tl[0], &tl[1], speed);
break;
case XFER_SW_DMA_2:
case XFER_SW_DMA_1:
@ -1680,8 +1678,6 @@ pmac_ide_mdma_enable(ide_drive_t *drive, u16 mode)
{
ide_hwif_t *hwif = HWIF(drive);
pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)hwif->hwif_data;
int drive_cycle_time;
struct hd_driveid *id = drive->id;
u32 *timings, *timings2;
u32 timing_local[2];
int ret;
@ -1690,24 +1686,12 @@ pmac_ide_mdma_enable(ide_drive_t *drive, u16 mode)
timings = &pmif->timings[drive->select.b.unit & 0x01];
timings2 = &pmif->timings[(drive->select.b.unit & 0x01) + 2];
/* Check if drive provide explicit cycle time */
if ((id->field_valid & 2) && (id->eide_dma_time))
drive_cycle_time = id->eide_dma_time;
else
drive_cycle_time = 0;
/* Copy timings to local image */
timing_local[0] = *timings;
timing_local[1] = *timings2;
/* Calculate controller timings */
ret = set_timings_mdma( drive, pmif->kind,
&timing_local[0],
&timing_local[1],
mode,
drive_cycle_time);
if (ret)
return 0;
set_timings_mdma(drive, pmif->kind, &timing_local[0], &timing_local[1], mode);
/* Set feature on drive */
printk(KERN_INFO "%s: Enabling MultiWord DMA %d\n", drive->name, mode & 0xf);