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, 15 deletions

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index c74fef6bbc91..210f32d1e93c 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -296,20 +296,6 @@ static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
 {
 }
 
-static int sgiioc4_ide_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        /*
-         * ->set_pio_mode is not implemented currently
-         * so this is just for the completness
-         */
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 /* returns 1 if dma irq issued, 0 otherwise */
 static int
 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
@@ -612,7 +598,6 @@ ide_init_sgiioc4(ide_hwif_t * hwif)
         hwif->dma_setup = &sgiioc4_ide_dma_setup;
         hwif->dma_start = &sgiioc4_ide_dma_start;
         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
-        hwif->ide_dma_check = &sgiioc4_ide_dma_check;
         hwif->ide_dma_on = &sgiioc4_ide_dma_on;
         hwif->dma_off_quietly = &sgiioc4_dma_off_quietly;
         hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;