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ide: factor out setting PCI bus-mastering from ide_hwif_setup_dma()

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Factor out setting PCI bus-mastering from ide_hwif_setup_dma()
to ide_pci_set_master() helper.

While at it:

* don't read PCI Command register if not necessary

* use PCI device name instead of hwif->name

* cleanup ide_hwif_setup_dma() a bit

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-04-26 22:25:21 +02:00
parent b8e73fba60
commit d54452fbf8
1 changed files with 36 additions and 23 deletions
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59
drivers/ide/setup-pci.c
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@ -132,6 +132,29 @@ static unsigned long ide_get_or_set_dma_base(const struct ide_port_info *d, ide_
out:
return dma_base;
}
/*
* Set up BM-DMA capability (PnP BIOS should have done this)
*/
static int ide_pci_set_master(struct pci_dev *dev, const char *name)
{
u16 pcicmd;
pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
if ((pcicmd & PCI_COMMAND_MASTER) == 0) {
pci_set_master(dev);
if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) ||
(pcicmd & PCI_COMMAND_MASTER) == 0) {
printk(KERN_ERR "%s: error updating PCICMD on %s\n",
name, pci_name(dev));
return -EIO;
}
}
return 0;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d)
@ -340,36 +363,26 @@ static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev,
void ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
u16 pcicmd;
pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 ||
((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
(dev->class & 0x80))) {
unsigned long dma_base = ide_get_or_set_dma_base(d, hwif);
if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
/*
* Set up BM-DMA capability
* (PnP BIOS should have done this)
*/
pci_set_master(dev);
if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
printk(KERN_ERR "%s: %s error updating PCICMD\n",
hwif->name, d->name);
dma_base = 0;
}
}
if (dma_base) {
if (d->init_dma)
d->init_dma(hwif, dma_base);
ide_setup_dma(hwif, dma_base);
} else {
printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
"(BIOS)\n", hwif->name, d->name);
}
if (dma_base == 0 || ide_pci_set_master(dev, d->name) < 0)
goto out_disabled;
if (d->init_dma)
d->init_dma(hwif, dma_base);
ide_setup_dma(hwif, dma_base);
}
return;
out_disabled:
printk(KERN_INFO "%s: Bus-Master DMA disabled (BIOS) on %s\n",
d->name, pci_name(dev));
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */