diff options
Diffstat (limited to 'drivers/of/of_pci.c')
| -rw-r--r-- | drivers/of/of_pci.c | 112 |
1 files changed, 30 insertions, 82 deletions
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index ac1ec54e4fd5..ec7b060ae952 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -1,92 +1,40 @@ #include <linux/kernel.h> #include <linux/of_pci.h> -#include <linux/of_irq.h> #include <asm/prom.h> -/** - * of_irq_map_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_map_pci(struct pci_dev *pdev, struct of_irq *out_irq) +static inline int __of_pci_pci_compare(struct device_node *node, + unsigned int devfn) { - struct device_node *dn, *ppnode; - struct pci_dev *ppdev; - u32 lspec; - __be32 lspec_be; - __be32 laddr[3]; - u8 pin; - int rc; + unsigned int size; + const __be32 *reg = of_get_property(node, "reg", &size); - /* 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_map_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) - return rc; - /* No pin, exit */ - if (pin == 0) - return -ENODEV; - - /* Now we walk up the PCI tree */ - lspec = pin; - 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) - return -EINVAL; - } 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; + if (!reg || size < 5 * sizeof(__be32)) + return 0; + return ((be32_to_cpup(®[0]) >> 8) & 0xff) == devfn; +} - /* We can only get here if we hit a P2P bridge with no node, - * let's do standard swizzling and try again +struct device_node *of_pci_find_child_device(struct device_node *parent, + unsigned int devfn) +{ + struct device_node *node, *node2; + + for_each_child_of_node(parent, node) { + if (__of_pci_pci_compare(node, devfn)) + return node; + /* + * Some OFs create a parent node "multifunc-device" as + * a fake root for all functions of a multi-function + * device we go down them as well. */ - lspec = pci_swizzle_interrupt_pin(pdev, lspec); - pdev = ppdev; + if (!strcmp(node->name, "multifunc-device")) { + for_each_child_of_node(node, node2) { + if (__of_pci_pci_compare(node2, devfn)) { + of_node_put(node); + return node2; + } + } + } } - - lspec_be = cpu_to_be32(lspec); - laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); - laddr[1] = laddr[2] = cpu_to_be32(0); - return of_irq_map_raw(ppnode, &lspec_be, 1, laddr, out_irq); + return NULL; } -EXPORT_SYMBOL_GPL(of_irq_map_pci); +EXPORT_SYMBOL_GPL(of_pci_find_child_device); |