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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>
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
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9
drivers/ide/alim15x3.c
View File

@ -189,20 +189,20 @@ static void ali_set_dma_mode(ide_drive_t *drive, const u8 speed)
}
/**
* ali15x3_dma_setup - begin a DMA phase
* ali_dma_check - DMA check
* @drive: target device
* @cmd: command
*
* Returns 1 if the DMA cannot be performed, zero on success.
*/
static int ali15x3_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
static int ali_dma_check(ide_drive_t *drive, struct ide_cmd *cmd)
{
if (m5229_revision < 0xC2 && drive->media != ide_disk) {
if (cmd->tf_flags & IDE_TFLAG_WRITE)
return 1; /* try PIO instead of DMA */
}
return ide_dma_setup(drive, cmd);
return 0;
}
/**
@ -503,11 +503,12 @@ static const struct ide_port_ops ali_port_ops = {
static const struct ide_dma_ops ali_dma_ops = {
.dma_host_set = ide_dma_host_set,
.dma_setup = ali15x3_dma_setup,
.dma_setup = ide_dma_setup,
.dma_start = ide_dma_start,
.dma_end = ide_dma_end,
.dma_test_irq = ide_dma_test_irq,
.dma_lost_irq = ide_dma_lost_irq,
.dma_check = ali_dma_check,
.dma_timer_expiry = ide_dma_sff_timer_expiry,
.dma_sff_read_status = ide_dma_sff_read_status,
};

5
drivers/ide/ide-dma.c
View File

@ -566,9 +566,12 @@ EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd)
{
const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops;
if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 ||
(dma_ops->dma_check && dma_ops->dma_check(drive, cmd)) ||
ide_build_sglist(drive, cmd) == 0 ||
drive->hwif->dma_ops->dma_setup(drive, cmd))
dma_ops->dma_setup(drive, cmd))
return 1;
return 0;
}

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 = {

1
include/linux/ide.h
View File

@ -717,6 +717,7 @@ struct ide_dma_ops {
int (*dma_test_irq)(struct ide_drive_s *);
void (*dma_lost_irq)(struct ide_drive_s *);
/* below ones are optional */
int (*dma_check)(struct ide_drive_s *, struct ide_cmd *);
int (*dma_timer_expiry)(struct ide_drive_s *);
void (*dma_clear)(struct ide_drive_s *);
/*