ide: add IDE_HFLAG_ABUSE_SET_DMA_MODE host flag

* Add IDE_HFLAG_ABUSE_SET_DMA_MODE host flag and use it to decide
  what to do with transfer modes < XFER_PIO_0 in ide_set_xfer_rate().

* Set IDE_HFLAG_ABUSE_SET_DMA_MODE in host drivers that need it
  (aec62xx, amd74xx, cs5520, cs5535, hpt34x, hpt366, pdc202xx_old,
  serverworks, tc86c001 and via82cxxx) and cleanup ->set_dma_mode
  methods in host drivers that don't (IDE core code guarantees that
  ->set_dma_mode will be called only for modes which are present
  in SWDMA/MWDMA/UDMA masks).

While at it:

* Add IDE_HFLAGS_HPT34X/HPT3XX/PDC202XX/SVWKS define in
  hpt34x/hpt366/pdc202xx_old/serverworks host driver.

There should be no functionality changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index a7280311357b..e9bd269547bb 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -366,12 +366,17 @@ static void __devinit init_hwif_svwks (ide_hwif_t *hwif)
         }
 }
 
+#define IDE_HFLAGS_SVWKS \
+        (IDE_HFLAG_LEGACY_IRQS | \
+         IDE_HFLAG_ABUSE_SET_DMA_MODE | \
+         IDE_HFLAG_BOOTABLE)
+
 static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
         {       /* 0 */
                 .name           = "SvrWks OSB4",
                 .init_chipset   = init_chipset_svwks,
                 .init_hwif      = init_hwif_svwks,
-                .host_flags     = IDE_HFLAG_LEGACY_IRQS | IDE_HFLAG_BOOTABLE,
+                .host_flags     = IDE_HFLAGS_SVWKS,
                 .pio_mask       = ATA_PIO4,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = 0x00, /* UDMA is problematic on OSB4 */
@@ -379,7 +384,7 @@ static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
                 .name           = "SvrWks CSB5",
                 .init_chipset   = init_chipset_svwks,
                 .init_hwif      = init_hwif_svwks,
-                .host_flags     = IDE_HFLAG_LEGACY_IRQS | IDE_HFLAG_BOOTABLE,
+                .host_flags     = IDE_HFLAGS_SVWKS,
                 .pio_mask       = ATA_PIO4,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = ATA_UDMA5,
@@ -387,7 +392,7 @@ static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
                 .name           = "SvrWks CSB6",
                 .init_chipset   = init_chipset_svwks,
                 .init_hwif      = init_hwif_svwks,
-                .host_flags     = IDE_HFLAG_LEGACY_IRQS | IDE_HFLAG_BOOTABLE,
+                .host_flags     = IDE_HFLAGS_SVWKS,
                 .pio_mask       = ATA_PIO4,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = ATA_UDMA5,
@@ -395,8 +400,7 @@ static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
                 .name           = "SvrWks CSB6",
                 .init_chipset   = init_chipset_svwks,
                 .init_hwif      = init_hwif_svwks,
-                .host_flags     = IDE_HFLAG_LEGACY_IRQS | IDE_HFLAG_SINGLE |
-                                  IDE_HFLAG_BOOTABLE,
+                .host_flags     = IDE_HFLAGS_SVWKS | IDE_HFLAG_SINGLE,
                 .pio_mask       = ATA_PIO4,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = ATA_UDMA5,
@@ -404,8 +408,7 @@ static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
                 .name           = "SvrWks HT1000",
                 .init_chipset   = init_chipset_svwks,
                 .init_hwif      = init_hwif_svwks,
-                .host_flags     = IDE_HFLAG_LEGACY_IRQS | IDE_HFLAG_SINGLE |
-                                  IDE_HFLAG_BOOTABLE,
+                .host_flags     = IDE_HFLAGS_SVWKS | IDE_HFLAG_SINGLE,
                 .pio_mask       = ATA_PIO4,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = ATA_UDMA5,