ide: add ->dma_check method
* 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>
diff --git a/drivers/ide/trm290.c b/drivers/ide/trm290.c
index b91bb70..1076efd 100644
--- a/drivers/ide/trm290.c
+++ b/drivers/ide/trm290.c
@@ -176,19 +176,21 @@
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 @@
.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 = {