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PCI: add a new function to map BAR offsets

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Add a function to map a given resource number to a corresponding
register so drivers can get the offset and type of device specific BARs.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yu Zhao
2008-11-22 02:41:27 +08:00
committed by Jesse Barnes
parent 3789fa8a2e
commit 613e7ed6f7
3 changed files with 29 additions and 8 deletions
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22
drivers/pci/pci.c
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@@ -2201,6 +2201,28 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
return bars;
}
/**
* pci_resource_bar - get position of the BAR associated with a resource
* @dev: the PCI device
* @resno: the resource number
* @type: the BAR type to be filled in
*
* Returns BAR position in config space, or 0 if the BAR is invalid.
*/
int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
{
if (resno < PCI_ROM_RESOURCE) {
*type = pci_bar_unknown;
return PCI_BASE_ADDRESS_0 + 4 * resno;
} else if (resno == PCI_ROM_RESOURCE) {
*type = pci_bar_mem32;
return dev->rom_base_reg;
}
dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno);
return 0;
}
static void __devinit pci_no_domains(void)
{
#ifdef CONFIG_PCI_DOMAINS