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-rw-r--r--drivers/pci/bus.c151
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 @@
1/*
2 * drivers/pci/bus.c
3 *
4 * From setup-res.c, by:
5 * Dave Rusling (david.rusling@reo.mts.dec.com)
6 * David Mosberger (davidm@cs.arizona.edu)
7 * David Miller (davem@redhat.com)
8 * Ivan Kokshaysky (ink@jurassic.park.msu.ru)
9 */
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/pci.h>
13#include <linux/errno.h>
14#include <linux/ioport.h>
15#include <linux/proc_fs.h>
16#include <linux/init.h>
17
18#include "pci.h"
19
20/**
21 * pci_bus_alloc_resource - allocate a resource from a parent bus
22 * @bus: PCI bus
23 * @res: resource to allocate
24 * @size: size of resource to allocate
25 * @align: alignment of resource to allocate
26 * @min: minimum /proc/iomem address to allocate
27 * @type_mask: IORESOURCE_* type flags
28 * @alignf: resource alignment function
29 * @alignf_data: data argument for resource alignment function
30 *
31 * Given the PCI bus a device resides on, the size, minimum address,
32 * alignment and type, try to find an acceptable resource allocation
33 * for a specific device resource.
34 */
35int
36pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
37 unsigned long size, unsigned long align, unsigned long min,
38 unsigned int type_mask,
39 void (*alignf)(void *, struct resource *,
40 unsigned long, unsigned long),
41 void *alignf_data)
42{
43 int i, ret = -ENOMEM;
44
45 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
46
47 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
48 struct resource *r = bus->resource[i];
49 if (!r)
50 continue;
51
52 /* type_mask must match */
53 if ((res->flags ^ r->flags) & type_mask)
54 continue;
55
56 /* We cannot allocate a non-prefetching resource
57 from a pre-fetching area */
58 if ((r->flags & IORESOURCE_PREFETCH) &&
59 !(res->flags & IORESOURCE_PREFETCH))
60 continue;
61
62 /* Ok, try it out.. */
63 ret = allocate_resource(r, res, size, min, -1, align,
64 alignf, alignf_data);
65 if (ret == 0)
66 break;
67 }
68 return ret;
69}
70
71/**
72 * add a single device
73 * @dev: device to add
74 *
75 * This adds a single pci device to the global
76 * device list and adds sysfs and procfs entries
77 */
78void __devinit pci_bus_add_device(struct pci_dev *dev)
79{
80 device_add(&dev->dev);
81
82 spin_lock(&pci_bus_lock);
83 list_add_tail(&dev->global_list, &pci_devices);
84 spin_unlock(&pci_bus_lock);
85
86 pci_proc_attach_device(dev);
87 pci_create_sysfs_dev_files(dev);
88}
89
90/**
91 * pci_bus_add_devices - insert newly discovered PCI devices
92 * @bus: bus to check for new devices
93 *
94 * Add newly discovered PCI devices (which are on the bus->devices
95 * list) to the global PCI device list, add the sysfs and procfs
96 * entries. Where a bridge is found, add the discovered bus to
97 * the parents list of child buses, and recurse (breadth-first
98 * to be compatible with 2.4)
99 *
100 * Call hotplug for each new devices.
101 */
102void __devinit pci_bus_add_devices(struct pci_bus *bus)
103{
104 struct pci_dev *dev;
105
106 list_for_each_entry(dev, &bus->devices, bus_list) {
107 /*
108 * Skip already-present devices (which are on the
109 * global device list.)
110 */
111 if (!list_empty(&dev->global_list))
112 continue;
113 pci_bus_add_device(dev);
114 }
115
116 list_for_each_entry(dev, &bus->devices, bus_list) {
117
118 BUG_ON(list_empty(&dev->global_list));
119
120 /*
121 * If there is an unattached subordinate bus, attach
122 * it and then scan for unattached PCI devices.
123 */
124 if (dev->subordinate && list_empty(&dev->subordinate->node)) {
125 spin_lock(&pci_bus_lock);
126 list_add_tail(&dev->subordinate->node, &dev->bus->children);
127 spin_unlock(&pci_bus_lock);
128 pci_bus_add_devices(dev->subordinate);
129
130 sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
131 }
132 }
133}
134
135void pci_enable_bridges(struct pci_bus *bus)
136{
137 struct pci_dev *dev;
138
139 list_for_each_entry(dev, &bus->devices, bus_list) {
140 if (dev->subordinate) {
141 pci_enable_device(dev);
142 pci_set_master(dev);
143 pci_enable_bridges(dev->subordinate);
144 }
145 }
146}
147
148EXPORT_SYMBOL(pci_bus_alloc_resource);
149EXPORT_SYMBOL_GPL(pci_bus_add_device);
150EXPORT_SYMBOL(pci_bus_add_devices);
151EXPORT_SYMBOL(pci_enable_bridges);