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cs5530/sc1200: DMA support cleanup

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sc1200.c:

* remove open-coded variant of ide_dma_host_off() (== ->dma_host_off),
  it is not needed because ->dma_off_quietly calls ->dma_host_off

* use ->dma_host_on (== ide_dma_host_on() for this driver) instead of
  open-coded variant, call it from the users of sc1200_config_dma2()

  [ there is no need to call ->dma_host_on in sc1200_config_dma() because
    core code takes care of calling ->ide_dma_on on successful execution
    of ->ide_dma_check ]

* add comment about ->tuneproc interface abuse

cs5530.c/sc1200.c:

* core code takes care of calling ->dma_off_quietly before calling
  ->ide_dma_check so there is no need to call it in ->ide_dma_check methods

* bump driver version

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-05-16 00:51:44 +02:00
parent bd203b57c7
commit a01ba4011a
2 changed files with 13 additions and 21 deletions
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7
drivers/ide/pci/cs5530.c
View File

@ -1,5 +1,5 @@
/*
* linux/drivers/ide/pci/cs5530.c Version 0.71 Mar 10 2007
* linux/drivers/ide/pci/cs5530.c Version 0.72 Mar 10 2007
*
* Copyright (C) 2000 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2000 Mark Lord <mlord@pobox.com>
@ -141,11 +141,6 @@ static int cs5530_config_dma(ide_drive_t *drive)
unsigned long basereg;
u8 unit = drive->dn & 1, mode = 0;
/*
* Default to DMA-off in case we run into trouble here.
*/
hwif->dma_off_quietly(drive);
if (ide_use_dma(drive))
mode = ide_max_dma_mode(drive);

27
drivers/ide/pci/sc1200.c
View File

@ -1,5 +1,5 @@
/*
* linux/drivers/ide/pci/sc1200.c Version 0.92 Mar 10 2007
* linux/drivers/ide/pci/sc1200.c Version 0.93 Mar 10 2007
*
* Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
@ -136,12 +136,6 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
unsigned short pci_clock;
unsigned int basereg = hwif->channel ? 0x50 : 0x40;
/*
* Default to DMA-off in case we run into trouble here.
*/
hwif->dma_off_quietly(drive); /* turn off DMA while we fiddle */
outb(inb(hwif->dma_base+2)&~(unit?0x40:0x20), hwif->dma_base+2); /* clear DMA_capable bit */
/*
* Tell the drive to switch to the new mode; abort on failure.
*/
@ -217,8 +211,6 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
}
outb(inb(hwif->dma_base+2)|(unit?0x40:0x20), hwif->dma_base+2); /* set DMA_capable bit */
return 0; /* success */
}
@ -277,6 +269,9 @@ static void sc1200_tuneproc (ide_drive_t *drive, byte pio) /* mode=255 means "au
static byte modes[5] = {XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};
int mode = -1;
/*
* bad abuse of ->tuneproc interface
*/
switch (pio) {
case 200: mode = XFER_UDMA_0; break;
case 201: mode = XFER_UDMA_1; break;
@ -287,7 +282,9 @@ static void sc1200_tuneproc (ide_drive_t *drive, byte pio) /* mode=255 means "au
}
if (mode != -1) {
printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
(void)sc1200_config_dma2(drive, mode);
hwif->dma_off_quietly(drive);
if (sc1200_config_dma2(drive, mode) == 0)
hwif->dma_host_on(drive);
return;
}
@ -421,12 +418,12 @@ static int sc1200_resume (struct pci_dev *dev)
for (d = 0; d < MAX_DRIVES; ++d) {
ide_drive_t *drive = &(hwif->drives[d]);
if (drive->present && !__ide_dma_bad_drive(drive)) {
int was_using_dma = drive->using_dma;
int enable_dma = drive->using_dma;
hwif->dma_off_quietly(drive);
sc1200_config_dma(drive);
if (!was_using_dma && drive->using_dma) {
hwif->dma_off_quietly(drive);
}
if (sc1200_config_dma(drive))
enable_dma = 0;
if (enable_dma)
hwif->dma_host_on(drive);
}
}
}