1 files changed, 151 insertions, 0 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
new file mode 100644
index 000000000000..dbd33605cc10
--- /dev/null
+++ b/drivers/pci/bus.c
@@ -0,0 +1,151 @@
+/*
+ *      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 <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;
+}
+
+/**
+ * add a single device
+ * @dev: device to add
+ *
+ * This adds a single pci device to the global
+ * device list and adds sysfs and procfs entries
+ */
+void __devinit pci_bus_add_device(struct pci_dev *dev)
+{
+        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);
+        pci_create_sysfs_dev_files(dev);
+}
+
+/**
+ * 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;
+                pci_bus_add_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);
+
+                        sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
+                }
+        }
+}
+
+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_alloc_resource);
+EXPORT_SYMBOL_GPL(pci_bus_add_device);
+EXPORT_SYMBOL(pci_bus_add_devices);
+EXPORT_SYMBOL(pci_enable_bridges);