/* * pci_dn.c * * Copyright (C) 2001 Todd Inglett, IBM Corporation * * PCI manipulation via device_nodes. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include /* * Traverse_func that inits the PCI fields of the device node. * NOTE: this *must* be done before read/write config to the device. */ void * __devinit update_dn_pci_info(struct device_node *dn, void *data) { struct pci_controller *phb = data; const int *type = of_get_property(dn, "ibm,pci-config-space-type", NULL); const u32 *regs; struct pci_dn *pdn; pdn = alloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL); if (pdn == NULL) return NULL; memset(pdn, 0, sizeof(*pdn)); dn->data = pdn; pdn->node = dn; pdn->phb = phb; regs = of_get_property(dn, "reg", NULL); if (regs) { /* First register entry is addr (00BBSS00) */ pdn->busno = (regs[0] >> 16) & 0xff; pdn->devfn = (regs[0] >> 8) & 0xff; } pdn->pci_ext_config_space = (type && *type == 1); return NULL; } /* * Traverse a device tree stopping each PCI device in the tree. * This is done depth first. As each node is processed, a "pre" * function is called and the children are processed recursively. * * The "pre" func returns a value. If non-zero is returned from * the "pre" func, the traversal stops and this value is returned. * This return value is useful when using traverse as a method of * finding a device. * * NOTE: we do not run the func for devices that do not appear to * be PCI except for the start node which we assume (this is good * because the start node is often a phb which may be missing PCI * properties). * We use the class-code as an indicator. If we run into * one of these nodes we also assume its siblings are non-pci for * performance. */ void *traverse_pci_devices(struct device_node *start, traverse_func pre, void *data) { struct device_node *dn, *nextdn; void *ret; /* We started with a phb, iterate all childs */ for (dn = start->child; dn; dn = nextdn) { const u32 *classp; u32 class; nextdn = NULL; classp = of_get_property(dn, "class-code", NULL); class = classp ? *classp : 0; if (pre && ((ret = pre(dn, data)) != NULL)) return ret; /* If we are a PCI bridge, go down */ if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI || (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)) /* Depth first...do children */ nextdn = dn->child; else if (dn->sibling) /* ok, try next sibling instead. */ nextdn = dn->sibling; if (!nextdn) { /* Walk up to next valid sibling. */ do { dn = dn->parent; if (dn == start) return NULL; } while (dn->sibling == NULL); nextdn = dn->sibling; } } return NULL; } /** * pci_devs_phb_init_dynamic - setup pci devices under this PHB * phb: pci-to-host bridge (top-level bridge connecting to cpu) * * This routine is called both during boot, (before the memory * subsystem is set up, before kmalloc is valid) and during the * dynamic lpar operation of adding a PHB to a running system. */ void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb) { struct device_node *dn = phb->dn; struct pci_dn *pdn; /* PHB nodes themselves must not match */ update_dn_pci_info(dn, phb); pdn = dn->data; if (pdn) { pdn->devfn = pdn->busno = -1; pdn->phb = phb; } /* Update dn->phb ptrs for new phb and children devices */ traverse_pci_devices(dn, update_dn_pci_info, phb); } /* * Traversal func that looks for a value. * If found, the pci_dn is returned (thus terminating the traversal). */ static void *is_devfn_node(struct device_node *dn, void *data) { int busno = ((unsigned long)data >> 8) & 0xff; int devfn = ((unsigned long)data) & 0xff; struct pci_dn *pci = dn->data; if (pci && (devfn == pci->devfn) && (busno == pci->busno)) return dn; return NULL; } /* * This is the "slow" path for looking up a device_node from a * pci_dev. It will hunt for the device under its parent's * phb and then update of_node pointer. * * It may also do fixups on the actual device since this happens * on the first read/write. * * Note that it also must deal with devices that don't exist. * In this case it may probe for real hardware ("just in case") * and add a device_node to the device tree if necessary. * * Is this function necessary anymore now that dev->dev.of_node is * used to store the node pointer? * */ struct device_node *fetch_dev_dn(struct pci_dev *dev) { struct device_node *orig_dn = dev->dev.of_node; struct device_node *dn; unsigned long searchval = (dev->bus->number << 8) | dev->devfn; dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval); if (dn) dev->dev.of_node = dn; return dn; } EXPORT_SYMBOL(fetch_dev_dn); /** * pci_devs_phb_init - Initialize phbs and pci devs under them. * * This routine walks over all phb's (pci-host bridges) on the * system, and sets up assorted pci-related structures * (including pci info in the device node structs) for each * pci device found underneath. This routine runs once, * early in the boot sequence. */ void __init pci_devs_phb_init(void) { struct pci_controller *phb, *tmp; /* This must be done first so the device nodes have valid pci info! */ list_for_each_entry_safe(phb, tmp, &hose_list, list_node) pci_devs_phb_init_dynamic(phb); }