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ide: factor out simplex handling from ide_pci_dma_base()

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* Factor out simplex handling from ide_pci_dma_base() to
  ide_pci_check_simplex().

* Set hwif->dma_base early in ->init_dma method / ide_hwif_setup_dma()
  and reset it in ide_init_port() if DMA initialization fails.

* Use ->read_sff_dma_status instead of ->INB in ide_pci_dma_base().

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2008-07-23 19:55:51 +02:00
parent 81e8d5a34f
commit ebb00fb55d
5 changed files with 43 additions and 18 deletions
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35
drivers/ide/setup-pci.c
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@ -73,15 +73,12 @@ static void ide_pci_clear_simplex(unsigned long dma_base, const char *name)
* @d: IDE port info
*
* Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
* Where a device has a partner that is already in DMA mode we check
* and enforce IDE simplex rules.
*/
unsigned long ide_pci_dma_base(ide_hwif_t *hwif, const struct ide_port_info *d)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long dma_base = 0;
u8 dma_stat = 0;
if (hwif->host_flags & IDE_HFLAG_MMIO)
return hwif->dma_base;
@ -102,11 +99,19 @@ unsigned long ide_pci_dma_base(ide_hwif_t *hwif, const struct ide_port_info *d)
if (hwif->channel)
dma_base += 8;
if (d->host_flags & IDE_HFLAG_CS5520)
return dma_base;
}
EXPORT_SYMBOL_GPL(ide_pci_dma_base);
int ide_pci_check_simplex(ide_hwif_t *hwif, const struct ide_port_info *d)
{
u8 dma_stat;
if (d->host_flags & (IDE_HFLAG_MMIO | IDE_HFLAG_CS5520))
goto out;
if (d->host_flags & IDE_HFLAG_CLEAR_SIMPLEX) {
ide_pci_clear_simplex(dma_base, d->name);
ide_pci_clear_simplex(hwif->dma_base, d->name);
goto out;
}
@ -120,15 +125,15 @@ unsigned long ide_pci_dma_base(ide_hwif_t *hwif, const struct ide_port_info *d)
* we tune the drive then try to grab DMA ownership if we want to be
* the DMA end. This has to be become dynamic to handle hot-plug.
*/
dma_stat = hwif->INB(dma_base + 2);
dma_stat = hwif->read_sff_dma_status(hwif);
if ((dma_stat & 0x80) && hwif->mate && hwif->mate->dma_base) {
printk(KERN_INFO "%s: simplex device: DMA disabled\n", d->name);
dma_base = 0;
return -1;
}
out:
return dma_base;
return 0;
}
EXPORT_SYMBOL_GPL(ide_pci_dma_base);
EXPORT_SYMBOL_GPL(ide_pci_check_simplex);
/*
* Set up BM-DMA capability (PnP BIOS should have done this)
@ -363,7 +368,15 @@ int ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
(dev->class & 0x80))) {
unsigned long base = ide_pci_dma_base(hwif, d);
if (base == 0 || ide_pci_set_master(dev, d->name) < 0)
if (base == 0)
return -1;
hwif->dma_base = base;
if (ide_pci_check_simplex(hwif, d) < 0)
return -1;
if (ide_pci_set_master(dev, d->name) < 0)
return -1;
if (hwif->host_flags & IDE_HFLAG_MMIO)
@ -377,8 +390,6 @@ int ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
if (ide_allocate_dma_engine(hwif))
return -1;
hwif->dma_base = base;
hwif->dma_ops = &sff_dma_ops;
}