- /* If we are underneath a PCI bridge, use PROM register
- * property of the parent bridge which is closest to
- * the PBM.
- *
- * However if that parent bridge has interrupt map/mask
- * properties of its own we use the PROM register property
- * of the next child device on the path to PDEV.
- *
- * In detail the two cases are (note that the 'X' below is the
- * 'next child on the path to PDEV' mentioned above):
- *
- * 1) PBM --> PCI bus lacking int{map,mask} --> X ... PDEV
- *
- * Here we use regs of 'PCI bus' device.
- *
- * 2) PBM --> PCI bus with int{map,mask} --> X ... PDEV
- *
- * Here we use regs of 'X'. Note that X can be PDEV.
- */
- if (pdev->bus->number != pbm->pci_first_busno) {
- struct pcidev_cookie *bus_pcp, *regs_pcp;
- struct pci_dev *bus_dev, *regs_dev;
- int plen;
+ ret = ((interrupt - 1 + (PCI_SLOT(pdev->devfn) & 3)) & 3) + 1;
+
+ printk("%s: %s IRQ Swivel %s [%x:%x] -> [%x]\n",
+ pbm->name, pci_name(toplevel_pdev), pci_name(pdev),
+ interrupt, PCI_SLOT(pdev->devfn), ret);
+
+ return ret;
+}
+
+static inline unsigned int pci_apply_intmap(struct pci_pbm_info *pbm,
+ struct pci_dev *toplevel_pdev,
+ struct pci_dev *pbus,
+ struct pci_dev *pdev,
+ unsigned int interrupt,
+ unsigned int *cnode)
+{
+ struct linux_prom_pci_intmap imap[PROM_PCIIMAP_MAX];
+ struct linux_prom_pci_intmask imask;
+ struct pcidev_cookie *pbus_pcp = pbus->sysdata;
+ struct pcidev_cookie *pdev_pcp = pdev->sysdata;
+ struct linux_prom_pci_registers *pregs = pdev_pcp->prom_regs;
+ int plen, num_imap, i;
+ unsigned int hi, mid, lo, irq, orig_interrupt;
+
+ *cnode = pbus_pcp->prom_node;
+
+ plen = prom_getproperty(pbus_pcp->prom_node, "interrupt-map",
+ (char *) &imap[0], sizeof(imap));
+ if (plen <= 0 ||
+ (plen % sizeof(struct linux_prom_pci_intmap)) != 0) {
+ printk("%s: Device %s interrupt-map has bad len %d\n",
+ pbm->name, pci_name(pbus), plen);
+ goto no_intmap;
+ }
+ num_imap = plen / sizeof(struct linux_prom_pci_intmap);
+
+ plen = prom_getproperty(pbus_pcp->prom_node, "interrupt-map-mask",
+ (char *) &imask, sizeof(imask));
+ if (plen <= 0 ||
+ (plen % sizeof(struct linux_prom_pci_intmask)) != 0) {
+ printk("%s: Device %s interrupt-map-mask has bad len %d\n",
+ pbm->name, pci_name(pbus), plen);
+ goto no_intmap;
+ }
+
+ orig_interrupt = interrupt;