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pata_sl82c105: remove un-needed code paths

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Remove the DMA setup function. As pointed out by Sergey we set the actual
DMA clock timing in set_dmamode so we don't actually need to do anything
with it at set up time, but just leave the PIO timings loaded.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan 2007-02-20 17:51:51 +00:00 committed by Jeff Garzik
parent cb0e34ba59
commit 16728da998
1 changed files with 9 additions and 30 deletions
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39
drivers/ata/pata_sl82c105.c
View file

@ -7,6 +7,13 @@
* SL82C105/Winbond 553 IDE driver
*
* and in part on the documentation and errata sheet
*
*
* Note: The controller like many controllers has shared timings for
* PIO and DMA. We thus flip to the DMA timings in dma_start and flip back
* in the dma_stop function. Thus we actually don't need a set_dmamode
* method as the PIO method is always called and will set the right PIO
* timing parameters.
*/
#include <linux/kernel.h>
@ -19,7 +26,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_sl82c105"
#define DRV_VERSION "0.2.3"
#define DRV_VERSION "0.2.5"
enum {
/*
@ -125,33 +132,6 @@ static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *a
pci_read_config_word(pdev, timing, &dummy);
}
/**
* sl82c105_set_dmamode - set initial DMA mode data
* @ap: ATA interface
* @adev: ATA device
*
* Called to do the DMA mode setup. This replaces the PIO timings
* for the device in question. Set appropriate PIO timings not DMA
* timings at this point.
*/
static void sl82c105_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
switch(adev->dma_mode) {
case XFER_MW_DMA_0:
sl82c105_configure_piomode(ap, adev, 0);
break;
case XFER_MW_DMA_1:
sl82c105_configure_piomode(ap, adev, 3);
break;
case XFER_MW_DMA_2:
sl82c105_configure_piomode(ap, adev, 4);
break;
default:
BUG();
}
}
/**
* sl82c105_reset_engine - Reset the DMA engine
* @ap: ATA interface
@ -222,7 +202,7 @@ static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
/* This will redo the initial setup of the DMA device to matching
PIO timings */
sl82c105_set_dmamode(ap, qc->dev);
sl82c105_set_piomode(ap, qc->dev);
}
static struct scsi_host_template sl82c105_sht = {
@ -246,7 +226,6 @@ static struct scsi_host_template sl82c105_sht = {
static struct ata_port_operations sl82c105_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = sl82c105_set_piomode,
.set_dmamode = sl82c105_set_dmamode,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,