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authorBjorn Helgaas <bjorn.helgaas@hp.com>2008-12-16 21:36:55 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-01-07 11:13:12 -0800
commit68feac87de15edfc2c700d2d81b814288c93d003 (patch)
tree97ee9f0dc3ee3728aca7d5a252eda6a1cb633430 /drivers
parente8c331e963c58b83db24b7d0e39e8c07f687dbc6 (diff)
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')
-rw-r--r--drivers/pci/pci.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9d2aa6366fd..c824dc8d617 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