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ide: add ide_tune_dma() helper

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After reworking the code responsible for selecting the best DMA
transfer mode it is now possible to add generic ide_tune_dma() helper.

Convert some IDE PCI host drivers to use it (the ones left need more work).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2007-05-10 00:01:09 +02:00
parent 2d5eaa6dd7
commit 29e744d088
14 changed files with 34 additions and 206 deletions
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26
drivers/ide/pci/piix.c
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@@ -303,30 +303,6 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed)
return ide_config_drive_speed(drive, speed);
}
/**
* piix_config_drive_for_dma - configure drive for DMA
* @drive: IDE drive to configure
*
* Set up a PIIX interface channel for the best available speed.
* We prefer UDMA if it is available and then MWDMA. If DMA is
* not available we switch to PIO and return 0.
*/
static int piix_config_drive_for_dma (ide_drive_t *drive)
{
u8 speed = ide_max_dma_mode(drive);
/*
* If no DMA speed was available or the chipset has DMA bugs
* then disable DMA and use PIO
*/
if (!speed)
return 0;
(void) piix_tune_chipset(drive, speed);
return ide_dma_enable(drive);
}
/**
* piix_config_drive_xfer_rate - set up an IDE device
* @drive: IDE drive to configure
@@ -339,7 +315,7 @@ static int piix_config_drive_xfer_rate (ide_drive_t *drive)
{
drive->init_speed = 0;
if (ide_use_dma(drive) && piix_config_drive_for_dma(drive))
if (ide_tune_dma(drive))
return 0;
if (ide_use_fast_pio(drive))