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, 22 deletions

diff --git a/drivers/ide/pci/scc_pata.c b/drivers/ide/pci/scc_pata.c
index f839bdeb903b..977b48e95ba4 100644
--- a/drivers/ide/pci/scc_pata.c
+++ b/drivers/ide/pci/scc_pata.c
@@ -284,27 +284,6 @@ static void scc_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      scc_configure_drive_for_dma     -       set up for DMA transfers
- *      @drive: drive we are going to set up
- *
- *      Set up the drive for DMA, tune the controller and drive as
- *      required.
- *      If the drive isn't suitable for DMA or we hit other problems
- *      then we will drop down to PIO and set up PIO appropriately.
- *      (return -1)
- */
-
-static int scc_config_drive_for_dma(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      scc_ide_dma_setup       -       begin a DMA phase
  *      @drive: target device
  *
@@ -701,7 +680,6 @@ static void __devinit init_hwif_scc(ide_hwif_t *hwif)
         hwif->ide_dma_end = scc_ide_dma_end;
         hwif->set_pio_mode = scc_set_pio_mode;
         hwif->set_dma_mode = scc_set_dma_mode;
-        hwif->ide_dma_check = scc_config_drive_for_dma;
         hwif->ide_dma_test_irq = scc_dma_test_irq;
         hwif->udma_filter = scc_udma_filter;