diff options
Diffstat (limited to 'drivers/of/of_pci_irq.c')
| -rw-r--r-- | drivers/of/of_pci_irq.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c deleted file mode 100644 index 3a05568f65df..000000000000 --- a/drivers/of/of_pci_irq.c +++ /dev/null @@ -1,131 +0,0 @@ -#include <linux/kernel.h> -#include <linux/of_pci.h> -#include <linux/of_irq.h> -#include <linux/export.h> - -/** - * of_irq_parse_pci - Resolve the interrupt for a PCI device - * @pdev: the device whose interrupt is to be resolved - * @out_irq: structure of_irq filled by this function - * - * This function resolves the PCI interrupt for a given PCI device. If a - * device-node exists for a given pci_dev, it will use normal OF tree - * walking. If not, it will implement standard swizzling and walk up the - * PCI tree until an device-node is found, at which point it will finish - * resolving using the OF tree walking. - */ -int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) -{ - struct device_node *dn, *ppnode; - struct pci_dev *ppdev; - __be32 laddr[3]; - u8 pin; - int rc; - - /* Check if we have a device node, if yes, fallback to standard - * device tree parsing - */ - dn = pci_device_to_OF_node(pdev); - if (dn) { - rc = of_irq_parse_one(dn, 0, out_irq); - if (!rc) - return rc; - } - - /* Ok, we don't, time to have fun. Let's start by building up an - * interrupt spec. we assume #interrupt-cells is 1, which is standard - * for PCI. If you do different, then don't use that routine. - */ - rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); - if (rc != 0) - goto err; - /* No pin, exit with no error message. */ - if (pin == 0) - return -ENODEV; - - /* Now we walk up the PCI tree */ - for (;;) { - /* Get the pci_dev of our parent */ - ppdev = pdev->bus->self; - - /* Ouch, it's a host bridge... */ - if (ppdev == NULL) { - ppnode = pci_bus_to_OF_node(pdev->bus); - - /* No node for host bridge ? give up */ - if (ppnode == NULL) { - rc = -EINVAL; - goto err; - } - } else { - /* We found a P2P bridge, check if it has a node */ - ppnode = pci_device_to_OF_node(ppdev); - } - - /* Ok, we have found a parent with a device-node, hand over to - * the OF parsing code. - * We build a unit address from the linux device to be used for - * resolution. Note that we use the linux bus number which may - * not match your firmware bus numbering. - * Fortunately, in most cases, interrupt-map-mask doesn't - * include the bus number as part of the matching. - * You should still be careful about that though if you intend - * to rely on this function (you ship a firmware that doesn't - * create device nodes for all PCI devices). - */ - if (ppnode) - break; - - /* We can only get here if we hit a P2P bridge with no node, - * let's do standard swizzling and try again - */ - pin = pci_swizzle_interrupt_pin(pdev, pin); - pdev = ppdev; - } - - out_irq->np = ppnode; - out_irq->args_count = 1; - out_irq->args[0] = pin; - laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); - laddr[1] = laddr[2] = cpu_to_be32(0); - rc = of_irq_parse_raw(laddr, out_irq); - if (rc) - goto err; - return 0; -err: - if (rc == -ENOENT) { - dev_warn(&pdev->dev, - "%s: no interrupt-map found, INTx interrupts not available\n", - __func__); - pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n", - __func__); - } else { - dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc); - } - return rc; -} -EXPORT_SYMBOL_GPL(of_irq_parse_pci); - -/** - * of_irq_parse_and_map_pci() - Decode a PCI irq from the device tree and map to a virq - * @dev: The pci device needing an irq - * @slot: PCI slot number; passed when used as map_irq callback. Unused - * @pin: PCI irq pin number; passed when used as map_irq callback. Unused - * - * @slot and @pin are unused, but included in the function so that this - * function can be used directly as the map_irq callback to - * pci_assign_irq() and struct pci_host_bridge.map_irq pointer - */ -int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin) -{ - struct of_phandle_args oirq; - int ret; - - ret = of_irq_parse_pci(dev, &oirq); - if (ret) - return 0; /* Proper return code 0 == NO_IRQ */ - - return irq_create_of_mapping(&oirq); -} -EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci); - |