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/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index 4666e4c1597b..c0d82d290587 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -196,16 +196,6 @@ static void svwks_set_dma_mode(ide_drive_t *drive, const u8 speed)
         pci_write_config_byte(dev, 0x54, ultra_enable);
 }
 
-static int svwks_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static unsigned int __devinit init_chipset_svwks (struct pci_dev *dev, const char *name)
 {
         unsigned int reg;
@@ -392,7 +382,6 @@ static void __devinit init_hwif_svwks (ide_hwif_t *hwif)
         if (!hwif->dma_base)
                 return;
 
-        hwif->ide_dma_check = &svwks_config_drive_xfer_rate;
         if (hwif->pci_dev->device != PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                         hwif->cbl = ata66_svwks(hwif);