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/sl82c105.c b/drivers/ide/pci/sl82c105.c
index 245eac05ab1b..c9090faf49bd 100644
--- a/drivers/ide/pci/sl82c105.c
+++ b/drivers/ide/pci/sl82c105.c
@@ -145,21 +145,6 @@ static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /*
- * Check to see if the drive and chipset are capable of DMA mode.
- */
-static int sl82c105_ide_dma_check(ide_drive_t *drive)
-{
-        DBG(("sl82c105_ide_dma_check(drive:%s)\n", drive->name));
-
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/*
  * The SL82C105 holds off all IDE interrupts while in DMA mode until
  * all DMA activity is completed.  Sometimes this causes problems (eg,
  * when the drive wants to report an error condition).
@@ -406,7 +391,6 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
         hwif->atapi_dma  = 1;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check             = &sl82c105_ide_dma_check;
         hwif->ide_dma_on                = &sl82c105_ide_dma_on;
         hwif->dma_off_quietly           = &sl82c105_dma_off_quietly;
         hwif->dma_lost_irq              = &sl82c105_dma_lost_irq;