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hpt366: clean up DMA timeout handling for HPT370 

Clean up DMA timeout handling for HPT370:

- hpt370_lostirq_timeout() cleared the DMA status which made __ide_dma_end()
   called afterwards return the incorrect result, and the DMA engine was reset
   both before and after stopping DMA while the HighPoint drivers only do it
   after (which seems logical) -- fix this and also rename the function;

- get rid of the needless mutual recursion in hpt370_ide_dma_end() and
   hpt370_ide_dma_timeout();

- get rid of hpt370_lostirq_timeout() since hwif->ide_dma_end() called from
   the driver's interrupt handler later does all its work.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Sergei Shtylyov 2007-02-07 18:18:13 +01:00 committed by Bartlomiej Zolnierkiewicz
parent 26ccb802ee
commit 4bf63de27e
1 changed files with 25 additions and 37 deletions
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62
drivers/ide/pci/hpt366.c
View File

@ -1,5 +1,5 @@
/*
* linux/drivers/ide/pci/hpt366.c Version 0.51 Jun 04, 2006
* linux/drivers/ide/pci/hpt366.c Version 0.52 Jun 07, 2006
*
* Copyright (C) 1999-2003 Andre Hedrick <andre@linux-ide.org>
* Portions Copyright (C) 2001 Sun Microsystems, Inc.
@ -90,6 +90,7 @@
* there; make HPT36x speedproc handler look the same way as the HPT37x one
* - fix the tuneproc handler to always set the PIO mode requested, not the
* best possible one
* - clean up DMA timeout handling for HPT370
* <source@mvista.com>
*/
@ -680,7 +681,7 @@ static int hpt366_ide_dma_lostirq(ide_drive_t *drive)
return __ide_dma_lostirq(drive);
}
static void hpt370_clear_engine (ide_drive_t *drive)
static void hpt370_clear_engine(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
@ -688,6 +689,22 @@ static void hpt370_clear_engine (ide_drive_t *drive)
udelay(10);
}
static void hpt370_irq_timeout(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u16 bfifo = 0;
u8 dma_cmd;
pci_read_config_word(hwif->pci_dev, hwif->select_data + 2, &bfifo);
printk(KERN_DEBUG "%s: %d bytes in FIFO\n", drive->name, bfifo & 0x1ff);
/* get DMA command mode */
dma_cmd = hwif->INB(hwif->dma_command);
/* stop DMA */
hwif->OUTB(dma_cmd & ~0x1, hwif->dma_command);
hpt370_clear_engine(drive);
}
static void hpt370_ide_dma_start(ide_drive_t *drive)
{
#ifdef HPT_RESET_STATE_ENGINE
@ -696,55 +713,27 @@ static void hpt370_ide_dma_start(ide_drive_t *drive)
ide_dma_start(drive);
}
static int hpt370_ide_dma_end (ide_drive_t *drive)
static int hpt370_ide_dma_end(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_stat = hwif->INB(hwif->dma_status);
u8 dma_stat = hwif->INB(hwif->dma_status);
if (dma_stat & 0x01) {
/* wait a little */
udelay(20);
dma_stat = hwif->INB(hwif->dma_status);
if (dma_stat & 0x01)
hpt370_irq_timeout(drive);
}
if ((dma_stat & 0x01) != 0)
/* fallthrough */
(void) HWIF(drive)->ide_dma_timeout(drive);
return __ide_dma_end(drive);
}
static void hpt370_lostirq_timeout (ide_drive_t *drive)
static int hpt370_ide_dma_timeout(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 bfifo = 0;
u8 dma_stat = 0, dma_cmd = 0;
pci_read_config_byte(HWIF(drive)->pci_dev, hwif->select_data + 2, &bfifo);
printk(KERN_DEBUG "%s: %d bytes in FIFO\n", drive->name, bfifo);
hpt370_clear_engine(drive);
/* get dma command mode */
dma_cmd = hwif->INB(hwif->dma_command);
/* stop dma */
hwif->OUTB(dma_cmd & ~0x1, hwif->dma_command);
dma_stat = hwif->INB(hwif->dma_status);
/* clear errors */
hwif->OUTB(dma_stat | 0x6, hwif->dma_status);
}
static int hpt370_ide_dma_timeout (ide_drive_t *drive)
{
hpt370_lostirq_timeout(drive);
hpt370_clear_engine(drive);
hpt370_irq_timeout(drive);
return __ide_dma_timeout(drive);
}
static int hpt370_ide_dma_lostirq (ide_drive_t *drive)
{
hpt370_lostirq_timeout(drive);
hpt370_clear_engine(drive);
return __ide_dma_lostirq(drive);
}
/* returns 1 if DMA IRQ issued, 0 otherwise */
static int hpt374_ide_dma_test_irq(ide_drive_t *drive)
{
@ -1226,7 +1215,6 @@ static void __devinit init_hwif_hpt366(ide_hwif_t *hwif)
hwif->dma_start = &hpt370_ide_dma_start;
hwif->ide_dma_end = &hpt370_ide_dma_end;
hwif->ide_dma_timeout = &hpt370_ide_dma_timeout;
hwif->ide_dma_lostirq = &hpt370_ide_dma_lostirq;
} else
hwif->ide_dma_lostirq = &hpt366_ide_dma_lostirq;