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, 19 deletions

diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index 9582794eb65a..64b28cadb2b4 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -437,24 +437,6 @@ static void ali_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      ali15x3_config_drive_for_dma    -       configure for DMA
- *      @drive: drive to configure
- *
- *      Configure a drive for DMA operation. If DMA is not possible we
- *      drop the drive into PIO mode instead.
- */
-
-static int ali15x3_config_drive_for_dma(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      ali15x3_dma_setup       -       begin a DMA phase
  *      @drive: target device
  *
@@ -713,7 +695,6 @@ static void __devinit init_hwif_common_ali15x3 (ide_hwif_t *hwif)
         hwif->mwdma_mask = 0x07;
         hwif->swdma_mask = 0x07;
 
-        hwif->ide_dma_check = &ali15x3_config_drive_for_dma;
         hwif->dma_setup = &ali15x3_dma_setup;
 
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)