From 68feac87de15edfc2c700d2d81b814288c93d003 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Tue, 16 Dec 2008 21:36:55 -0700 Subject: [PATCH] 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 Signed-off-by: Jesse Barnes --- drivers/pci/pci.c | 20 ++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 21 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 9d2aa6366fd0..c824dc8d617c 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1421,6 +1421,26 @@ pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) return pin; } +/** + * pci_common_swizzle - swizzle INTx all the way to root bridge + * @dev: the PCI device + * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) + * + * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI + * bridges all the way up to a PCI root bus. + */ +u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) +{ + u8 pin = *pinp; + + while (dev->bus->self) { + pin = pci_swizzle_interrupt_pin(dev, pin); + dev = dev->bus->self; + } + *pinp = pin; + return PCI_SLOT(dev->devfn); +} + /** * pci_release_region - Release a PCI bar * @pdev: PCI device whose resources were previously reserved by pci_request_region diff --git a/include/linux/pci.h b/include/linux/pci.h index da1c22bab40e..170f9ae2d8a0 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -545,6 +545,7 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev, struct resource *res); u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin); int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge); +u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp); extern struct pci_dev *pci_dev_get(struct pci_dev *dev); extern void pci_dev_put(struct pci_dev *dev); extern void pci_remove_bus(struct pci_bus *b); -- 2.20.1