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/*
 *      drivers/pci/bus.c
 *
 * From setup-res.c, by:
 *      Dave Rusling (david.rusling@reo.mts.dec.com)
 *      David Mosberger (davidm@cs.arizona.edu)
 *      David Miller (davem@redhat.com)
 *      Ivan Kokshaysky (ink@jurassic.park.msu.ru)
 */
#include <linuxcomp.h>

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/init.h>

#include "pci.h"

/**
 * pci_bus_alloc_resource - allocate a resource from a parent bus
 * @bus: PCI bus
 * @res: resource to allocate
 * @size: size of resource to allocate
 * @align: alignment of resource to allocate
 * @min: minimum /proc/iomem address to allocate
 * @type_mask: IORESOURCE_* type flags
 * @alignf: resource alignment function
 * @alignf_data: data argument for resource alignment function
 *
 * Given the PCI bus a device resides on, the size, minimum address,
 * alignment and type, try to find an acceptable resource allocation
 * for a specific device resource.
 */
int
pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
        unsigned long size, unsigned long align, unsigned long min,
        unsigned int type_mask,
        void (*alignf)(void *, struct resource *,
                        unsigned long, unsigned long),
        void *alignf_data)
{
        int i, ret = -ENOMEM;

        type_mask |= IORESOURCE_IO | IORESOURCE_MEM;

        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
                struct resource *r = bus->resource[i];
                if (!r)
                        continue;

                /* type_mask must match */
                if ((res->flags ^ r->flags) & type_mask)
                        continue;

                /* We cannot allocate a non-prefetching resource
                   from a pre-fetching area */
                if ((r->flags & IORESOURCE_PREFETCH) &&
                    !(res->flags & IORESOURCE_PREFETCH))
                        continue;

                /* Ok, try it out.. */
                ret = allocate_resource(r, res, size, min, -1, align,
                                        alignf, alignf_data);
                if (ret == 0)
                        break;
        }
        return ret;
}

/**
 * pci_bus_add_devices - insert newly discovered PCI devices
 * @bus: bus to check for new devices
 *
 * Add newly discovered PCI devices (which are on the bus->devices
 * list) to the global PCI device list, add the sysfs and procfs
 * entries.  Where a bridge is found, add the discovered bus to
 * the parents list of child buses, and recurse (breadth-first
 * to be compatible with 2.4)
 *
 * Call hotplug for each new devices.
 */
void __devinit pci_bus_add_devices(struct pci_bus *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))
                        continue;
 
                device_add(&dev->dev);

                spin_lock(&pci_bus_lock);
                list_add_tail(&dev->global_list, &pci_devices);
                spin_unlock(&pci_bus_lock);

                pci_proc_attach_device(dev);

        }

        list_for_each_entry(dev, &bus->devices, bus_list) {

                BUG_ON(list_empty(&dev->global_list));
               
                /*
                 * If there is an unattached subordinate bus, attach
                 * it and then scan for unattached PCI devices.
                 */
                if (dev->subordinate && list_empty(&dev->subordinate->node)) {

                        spin_lock(&pci_bus_lock);
                        list_add_tail(&dev->subordinate->node, &dev->bus->children);
                        spin_unlock(&pci_bus_lock);
                        pci_bus_add_devices(dev->subordinate);

                }
        }
}

void pci_enable_bridges(struct pci_bus *bus)
{
        struct pci_dev *dev;

        list_for_each_entry(dev, &bus->devices, bus_list) {
                if (dev->subordinate) {
                        pci_enable_device(dev);
                        pci_set_master(dev);
                        pci_enable_bridges(dev->subordinate);
                }
        }
}

EXPORT_SYMBOL(pci_bus_add_devices);
EXPORT_SYMBOL(pci_enable_bridges);