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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2008-12-17 05:36:55 +0100 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-07 20:13:12 +0100 |
| commit | 68feac87de15edfc2c700d2d81b814288c93d003 (patch) | |
| tree | 97ee9f0dc3ee3728aca7d5a252eda6a1cb633430 /drivers/pci/pci.c | |
| parent | PCI hotplug: introduce functions for ACPI slot detection (diff) | |
| download | linux-68feac87de15edfc2c700d2d81b814288c93d003.tar.xz linux-68feac87de15edfc2c700d2d81b814288c93d003.zip | |
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>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 20 |
1 files changed, 20 insertions, 0 deletions
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 @@ -1422,6 +1422,26 @@ pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) } /** + * 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 * @bar: BAR to release |