From 613e7ed6f72b1a115f7ece8ce1b66cf095de1348 Mon Sep 17 00:00:00 2001 From: Yu Zhao Date: Sat, 22 Nov 2008 02:41:27 +0800 Subject: PCI: add a new function to map BAR offsets 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 Signed-off-by: Jesse Barnes --- drivers/pci/pci.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/pci/pci.c') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index deeab19d7d10..7e9c0f3936dd 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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 -- cgit v1.2.3