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ide: add ide_set_dma() helper (v2)

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* add ide_set_dma() helper and make ide_hwif_t.ide_dma_check return
  -1 when DMA needs to be disabled (== need to call ->ide_dma_off_quietly)
   0 when DMA needs to be enabled  (== need to call ->ide_dma_on)
   1 when DMA setting shouldn't be changed
* fix IDE code to use ide_set_dma() instead if using ->ide_dma_check directly

v2:
* updated for scc_pata

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2007-02-17 02:40:26 +01:00
parent 9ef5791e1b
commit 3608b5d71a
36 changed files with 120 additions and 139 deletions
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3
drivers/ide/ide.c
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@ -1135,7 +1135,8 @@ static int set_using_dma (ide_drive_t *drive, int arg)
if (HWIF(drive)->ide_dma_check == NULL)
return -EPERM;
if (arg) {
if (HWIF(drive)->ide_dma_check(drive)) return -EIO;
if (ide_set_dma(drive))
return -EIO;
if (HWIF(drive)->ide_dma_on(drive)) return -EIO;
} else {
if (__ide_dma_off(drive))