lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ide: add ->dma_check method

Browse Source 
* Add (an optional) ->dma_check method for checking if DMA can be
  used for a given command and fail DMA setup in ide_dma_prepare()
  if necessary.

* Convert alim15x3 and trm290 host drivers to use ->dma_check.

* Rename ali15x3_dma_setup() to ali_dma_check() while at it.

There should be no functional changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2009-03-31 20:15:21 +02:00
parent 7526efaafd
commit 8a4a5738ba
4 changed files with 20 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/ide/trm290.c
View File

@@ -176,19 +176,21 @@ static void trm290_selectproc (ide_drive_t *drive)
trm290_prepare_drive(drive, !!(drive->dev_flags & IDE_DFLAG_USING_DMA));
}
static int trm290_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
static int trm290_dma_check(ide_drive_t *drive, struct ide_cmd *cmd)
{
ide_hwif_t *hwif = drive->hwif;
unsigned int count, rw;
if (cmd->tf_flags & IDE_TFLAG_WRITE) {
#ifdef TRM290_NO_DMA_WRITES
/* always use PIO for writes */
return 1;
#endif
rw = 1;
} else
rw = 2;
}
return 0;
}
static int trm290_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
{
ide_hwif_t *hwif = drive->hwif;
unsigned int count, rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 1 : 2;
count = ide_build_dmatable(drive, cmd);
if (count == 0) {
@@ -312,6 +314,7 @@ static struct ide_dma_ops trm290_dma_ops = {
.dma_end = trm290_dma_end,
.dma_test_irq = trm290_dma_test_irq,
.dma_lost_irq = ide_dma_lost_irq,
.dma_check = trm290_dma_check,
};
static const struct ide_port_info trm290_chipset __devinitdata = {