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, 16 deletions

diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 184249ed125b..38cfc8c2ea58 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -199,21 +199,6 @@ static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
         }
 }
 
-/*
- * sc1200_config_dma() handles selection/setting of DMA/UDMA modes
- * for both the chipset and drive.
- */
-static int sc1200_config_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-
 /*  Replacement for the standard ide_dma_end action in
  *  dma_proc.
  *
@@ -391,7 +376,6 @@ static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
                 return;
 
         hwif->udma_filter = sc1200_udma_filter;
-        hwif->ide_dma_check = &sc1200_config_dma;
         hwif->ide_dma_end   = &sc1200_ide_dma_end;
 
         if (!noautodma)