ide: add IDE_HFLAG_SERIALIZE_DMA host flag
* Add IDE_HFLAG_SERIALIZE_DMA host flag to serialize ports
if DMA is available and handle it in ide_init_port().
* Convert sl82c105 host driver to use this new flag.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index e031686..b58eb79 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1367,8 +1367,11 @@
if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
hwif->port_ops = d->port_ops;
- if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
- hwif->mate->serialized = hwif->serialized = 1;
+ if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
+ ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
+ if (hwif->mate)
+ hwif->mate->serialized = hwif->serialized = 1;
+ }
hwif->swdma_mask = d->swdma_mask;
hwif->mwdma_mask = d->mwdma_mask;
diff --git a/drivers/ide/pci/sl82c105.c b/drivers/ide/pci/sl82c105.c
index 2c2fe59..c2127cb 100644
--- a/drivers/ide/pci/sl82c105.c
+++ b/drivers/ide/pci/sl82c105.c
@@ -296,9 +296,6 @@
hwif->dma_start = &sl82c105_dma_start;
hwif->ide_dma_end = &sl82c105_dma_end;
hwif->dma_timeout = &sl82c105_dma_timeout;
-
- if (hwif->mate)
- hwif->serialized = hwif->mate->serialized = 1;
}
static const struct ide_port_ops sl82c105_port_ops = {
@@ -319,6 +316,7 @@
#if defined(CONFIG_LOPEC) || defined(CONFIG_SANDPOINT)
IDE_HFLAG_FORCE_LEGACY_IRQS |
#endif
+ IDE_HFLAG_SERIALIZE_DMA |
IDE_HFLAG_NO_AUTODMA,
.pio_mask = ATA_PIO5,
.mwdma_mask = ATA_MWDMA2,
@@ -338,6 +336,7 @@
"revision %d, BM-DMA disabled\n", rev);
d.init_hwif = NULL;
d.mwdma_mask = 0;
+ d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
}
return ide_setup_pci_device(dev, &d);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 2da46af..e5f4174 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1087,6 +1087,8 @@
/* unmask IRQs */
IDE_HFLAG_UNMASK_IRQS = (1 << 25),
IDE_HFLAG_ABUSE_SET_DMA_MODE = (1 << 26),
+ /* serialize ports if DMA is possible (for sl82c105) */
+ IDE_HFLAG_SERIALIZE_DMA = (1 << 27),
/* force host out of "simplex" mode */
IDE_HFLAG_CLEAR_SIMPLEX = (1 << 28),
/* DSC overlap is unsupported */