text: /*
   * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
   * for RPA-compliant PPC64 platform.
   * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
   * Copyright (C) 2005 International Business Machines
   *
   * Updates, 2005, John Rose <johnrose@austin.ibm.com>
   * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
   *
   * All rights reserved.
   *
   * 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, GOOD TITLE or
   * NON INFRINGEMENT.  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., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include <linux/pci.h>
  #include <asm/pci-bridge.h>
  #include <asm/ppc-pci.h>
  
  static struct pci_bus *
  find_bus_among_children(struct pci_bus *bus,
                          struct device_node *dn)
  {
  	struct pci_bus *child = NULL;
  	struct list_head *tmp;
  	struct device_node *busdn;
  
  	busdn = pci_bus_to_OF_node(bus);
  	if (busdn == dn)
  		return bus;
  
  	list_for_each(tmp, &bus->children) {
  		child = find_bus_among_children(pci_bus_b(tmp), dn);
  		if (child)
  			break;
  	};
  	return child;
  }
  
  struct pci_bus *
  pcibios_find_pci_bus(struct device_node *dn)
  {
  	struct pci_dn *pdn = dn->data;
  
  	if (!pdn  || !pdn->phb || !pdn->phb->bus)
  		return NULL;
  
  	return find_bus_among_children(pdn->phb->bus, dn);
  }
  EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
  
  /**
   * pcibios_remove_pci_devices - remove all devices under this bus
   *
   * Remove all of the PCI devices under this bus both from the
   * linux pci device tree, and from the powerpc EEH address cache.
   */
  void
  pcibios_remove_pci_devices(struct pci_bus *bus)
  {
  	struct pci_dev *dev, *tmp;
  
  	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
  		eeh_remove_bus_device(dev);
  		pci_remove_bus_device(dev);
  	}
  }
  
  /* Must be called before pci_bus_add_devices */
  void
  pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
  {
  	struct pci_dev *dev;
  
  	list_for_each_entry(dev, &bus->devices, bus_list) {
  		/*
  		 * Skip already-present devices (which are on the
  		 * global device list.)
  		 */
  		if (list_empty(&dev->global_list)) {
  			int i;
  
  			/* Need to setup IOMMU tables */
  			ppc_md.iommu_dev_setup(dev);
  
  			if(fix_bus)
  				pcibios_fixup_device_resources(dev, bus);
  			pci_read_irq_line(dev);
  			for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  				struct resource *r = &dev->resource[i];
  
  				if (r->parent || !r->start || !r->flags)
  					continue;
  				pci_claim_resource(dev, i);
  			}
  		}
  	}
  
  	eeh_add_device_tree_late(bus);
  }
  EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
  
  static int
  pcibios_pci_config_bridge(struct pci_dev *dev)
  {
  	u8 sec_busno;
  	struct pci_bus *child_bus;
  
  	/* Get busno of downstream bus */
  	pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
  
  	/* Add to children of PCI bridge dev->bus */
  	child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
  	if (!child_bus) {
  		printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
  		return -EIO;
  	}
  	sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
  
  	pci_scan_child_bus(child_bus);
  
  	/* Fixup new pci devices without touching bus struct */
  	pcibios_fixup_new_pci_devices(child_bus, 0);
  
  	/* Make the discovered devices available */
  	pci_bus_add_devices(child_bus);
  	return 0;
  }
  
  /**
   * pcibios_add_pci_devices - adds new pci devices to bus
   *
   * This routine will find and fixup new pci devices under
   * the indicated bus. This routine presumes that there
   * might already be some devices under this bridge, so
   * it carefully tries to add only new devices.  (And that
   * is how this routine differs from other, similar pcibios
   * routines.)
   */
  void
  pcibios_add_pci_devices(struct pci_bus * bus)
  {
  	int slotno, num;
  	struct pci_dev *dev;
  	struct device_node *dn = pci_bus_to_OF_node(bus);
  
  	eeh_add_device_tree_early(dn);
  
  	if (_machine == PLATFORM_PSERIES_LPAR) {
  		/* use ofdt-based probe */
  		of_scan_bus(dn, bus);
  		if (!list_empty(&bus->devices)) {
  			pcibios_fixup_new_pci_devices(bus, 0);
  			pci_bus_add_devices(bus);
  		}
  	} else {
  		/* use legacy probe */
  		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
  		num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
  		if (num) {
  			pcibios_fixup_new_pci_devices(bus, 1);
  			pci_bus_add_devices(bus);
  		}
  
  		list_for_each_entry(dev, &bus->devices, bus_list)
  			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
  				pcibios_pci_config_bridge(dev);
  	}
  }
  EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
  
  struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
  {
  	struct pci_controller *phb;
  	int primary;
  
  	primary = list_empty(&hose_list);
  	phb = pcibios_alloc_controller(dn);
  	if (!phb)
  		return NULL;
  	setup_phb(dn, phb);
  	pci_process_bridge_OF_ranges(phb, dn, 0);
  
  	pci_setup_phb_io_dynamic(phb, primary);
  
  	pci_devs_phb_init_dynamic(phb);
  
  	if (dn->child)
  		eeh_add_device_tree_early(dn);
  
  	scan_phb(phb);
  	pcibios_fixup_new_pci_devices(phb->bus, 0);
  	pci_bus_add_devices(phb->bus);
  
  	return phb;
  }
  EXPORT_SYMBOL_GPL(init_phb_dynamic);
  