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, 2 insertions, 0 deletions

diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 9fa06393469a..38f8a4cb91d2 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -355,6 +355,7 @@ static ide_pci_device_t opti621_chipsets[] __devinitdata = {
                 .enablebits     = {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
                 .bootable       = ON_BOARD,
                 .pio_mask       = ATA_PIO3,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 1 */
                 .name           = "OPTI621X",
                 .init_hwif      = init_hwif_opti621,
@@ -362,6 +363,7 @@ static ide_pci_device_t opti621_chipsets[] __devinitdata = {
                 .enablebits     = {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
                 .bootable       = ON_BOARD,
                 .pio_mask       = ATA_PIO3,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         }
 };