ide: remove ->ide_dma_check (take 2)

* Add IDE_HFLAG_TRUST_BIOS_FOR_DMA host flag for host drivers that depend
  on BIOS for programming device/controller for DMA.  Set it in cy82c693,
  generic, ns87415, opti621 and trm290 host drivers.

* Add IDE_HFLAG_VDMA host flag for host drivers using VDMA.  Set it in cs5520
  host driver.

* Teach ide_tune_dma() about IDE_HFLAG_TRUST_BIOS_FOR_DMA flag.

* Add generic ide_dma_check() helper and remove all open coded ->ide_dma_check
  implementations.  Fix all places checking for presence of ->ide_dma_check
  hook to check for ->ide_dma_on instead.

* Remove no longer needed code from config_drive_for_dma().

* Make ide_tune_dma() static.

v2:
* Fix config_drive_for_dma() return values.

* Fix ide-dma.c build for CONFIG_BLK_DEV_IDEDMA_PCI=n by adding
  dummy config_drive_for_dma() inline.

* Fix IDE_HFLAG_TRUST_BIOS_FOR_DMA handling in ide_dma_check().

* Fix init_hwif_it8213() comment.

There should be no functionality changes caused by this patch.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 0 insertions, 11 deletions

diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index 1c4732958fb2..cd00081fb278 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -380,16 +380,6 @@ static u8 auide_mdma_filter(ide_drive_t *drive)
         return drive->hwif->mwdma_mask;
 }
 
-static int auide_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static int auide_dma_test_irq(ide_drive_t *drive)
 {       
         if (drive->waiting_for_dma == 0)
@@ -700,7 +690,6 @@ static int au_ide_probe(struct device *dev)
 
         hwif->mdma_filter               = &auide_mdma_filter;
 
-        hwif->ide_dma_check             = &auide_dma_check;
         hwif->dma_exec_cmd              = &auide_dma_exec_cmd;
         hwif->dma_start                 = &auide_dma_start;
         hwif->ide_dma_end               = &auide_dma_end;