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587 giacomo 1
/*
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 *      drivers/pci/bus.c
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 *
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 * From setup-res.c, by:
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 *      Dave Rusling (david.rusling@reo.mts.dec.com)
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 *      David Mosberger (davidm@cs.arizona.edu)
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 *      David Miller (davem@redhat.com)
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 *      Ivan Kokshaysky (ink@jurassic.park.msu.ru)
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 */
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#include <linuxcomp.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include "pci.h"
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/**
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 * pci_bus_alloc_resource - allocate a resource from a parent bus
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 * @bus: PCI bus
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 * @res: resource to allocate
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 * @size: size of resource to allocate
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 * @align: alignment of resource to allocate
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 * @min: minimum /proc/iomem address to allocate
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 * @type_mask: IORESOURCE_* type flags
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 * @alignf: resource alignment function
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 * @alignf_data: data argument for resource alignment function
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 *
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 * Given the PCI bus a device resides on, the size, minimum address,
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 * alignment and type, try to find an acceptable resource allocation
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 * for a specific device resource.
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 */
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int
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pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
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        unsigned long size, unsigned long align, unsigned long min,
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        unsigned int type_mask,
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        void (*alignf)(void *, struct resource *,
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                        unsigned long, unsigned long),
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        void *alignf_data)
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{
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        int i, ret = -ENOMEM;
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        type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
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        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
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                struct resource *r = bus->resource[i];
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                if (!r)
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                        continue;
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                /* type_mask must match */
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                if ((res->flags ^ r->flags) & type_mask)
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                        continue;
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                /* We cannot allocate a non-prefetching resource
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                   from a pre-fetching area */
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                if ((r->flags & IORESOURCE_PREFETCH) &&
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                    !(res->flags & IORESOURCE_PREFETCH))
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                        continue;
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                /* Ok, try it out.. */
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                ret = allocate_resource(r, res, size, min, -1, align,
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                                        alignf, alignf_data);
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                if (ret == 0)
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                        break;
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        }
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        return ret;
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}
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/**
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 * pci_bus_add_devices - insert newly discovered PCI devices
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 * @bus: bus to check for new devices
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 *
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 * Add newly discovered PCI devices (which are on the bus->devices
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 * list) to the global PCI device list, add the sysfs and procfs
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 * entries.  Where a bridge is found, add the discovered bus to
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 * the parents list of child buses, and recurse (breadth-first
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 * to be compatible with 2.4)
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 *
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 * Call hotplug for each new devices.
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 */
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void __devinit pci_bus_add_devices(struct pci_bus *bus)
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{
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        struct pci_dev *dev;
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        list_for_each_entry(dev, &bus->devices, bus_list) {
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                /*
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                 * Skip already-present devices (which are on the
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                 * global device list.)
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                 */
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                if (!list_empty(&dev->global_list))
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                        continue;
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                device_add(&dev->dev);
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                spin_lock(&pci_bus_lock);
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                list_add_tail(&dev->global_list, &pci_devices);
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                spin_unlock(&pci_bus_lock);
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                pci_proc_attach_device(dev);
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        }
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        list_for_each_entry(dev, &bus->devices, bus_list) {
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                BUG_ON(list_empty(&dev->global_list));
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                /*
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                 * If there is an unattached subordinate bus, attach
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                 * it and then scan for unattached PCI devices.
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                 */
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                if (dev->subordinate && list_empty(&dev->subordinate->node)) {
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                        spin_lock(&pci_bus_lock);
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                        list_add_tail(&dev->subordinate->node, &dev->bus->children);
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                        spin_unlock(&pci_bus_lock);
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                        pci_bus_add_devices(dev->subordinate);
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                }
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        }
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}
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void pci_enable_bridges(struct pci_bus *bus)
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{
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        struct pci_dev *dev;
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        list_for_each_entry(dev, &bus->devices, bus_list) {
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                if (dev->subordinate) {
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                        pci_enable_device(dev);
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                        pci_set_master(dev);
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                        pci_enable_bridges(dev->subordinate);
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                }
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        }
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}
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EXPORT_SYMBOL(pci_bus_add_devices);
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EXPORT_SYMBOL(pci_enable_bridges);