PCI: add pci_common_swizzle() for INTx swizzling
This patch adds pci_common_swizzle(), which swizzles INTx values all the way up to a root bridge. This common implementation can replace several architecture-specific ones. This should someday be combined with pci_get_interrupt_pin(), but I left it separate for now to make reviewing easier. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -1421,6 +1421,26 @@ pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
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return pin;
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}
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/**
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* pci_common_swizzle - swizzle INTx all the way to root bridge
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* @dev: the PCI device
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* @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
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*
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* Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
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* bridges all the way up to a PCI root bus.
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*/
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u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp)
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{
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u8 pin = *pinp;
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while (dev->bus->self) {
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pin = pci_swizzle_interrupt_pin(dev, pin);
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dev = dev->bus->self;
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}
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*pinp = pin;
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return PCI_SLOT(dev->devfn);
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}
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/**
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* pci_release_region - Release a PCI bar
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* @pdev: PCI device whose resources were previously reserved by pci_request_region
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@ -545,6 +545,7 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
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struct resource *res);
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u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin);
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int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
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u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp);
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extern struct pci_dev *pci_dev_get(struct pci_dev *dev);
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extern void pci_dev_put(struct pci_dev *dev);
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extern void pci_remove_bus(struct pci_bus *b);
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