blob: eed67d9e73bcd6e3e9ac684342d460a1ac77c62b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.. */
Linus Torvalds688d1912005-08-02 14:55:40 -070063 ret = allocate_resource(r, res, size,
64 r->start ? : min,
65 -1, align,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 alignf, alignf_data);
67 if (ret == 0)
68 break;
69 }
70 return ret;
71}
72
73/**
74 * add a single device
75 * @dev: device to add
76 *
77 * This adds a single pci device to the global
78 * device list and adds sysfs and procfs entries
79 */
80void __devinit pci_bus_add_device(struct pci_dev *dev)
81{
82 device_add(&dev->dev);
83
84 spin_lock(&pci_bus_lock);
85 list_add_tail(&dev->global_list, &pci_devices);
86 spin_unlock(&pci_bus_lock);
87
88 pci_proc_attach_device(dev);
89 pci_create_sysfs_dev_files(dev);
90}
91
92/**
93 * pci_bus_add_devices - insert newly discovered PCI devices
94 * @bus: bus to check for new devices
95 *
96 * Add newly discovered PCI devices (which are on the bus->devices
97 * list) to the global PCI device list, add the sysfs and procfs
98 * entries. Where a bridge is found, add the discovered bus to
99 * the parents list of child buses, and recurse (breadth-first
100 * to be compatible with 2.4)
101 *
102 * Call hotplug for each new devices.
103 */
104void __devinit pci_bus_add_devices(struct pci_bus *bus)
105{
106 struct pci_dev *dev;
107
108 list_for_each_entry(dev, &bus->devices, bus_list) {
109 /*
110 * Skip already-present devices (which are on the
111 * global device list.)
112 */
113 if (!list_empty(&dev->global_list))
114 continue;
115 pci_bus_add_device(dev);
116 }
117
118 list_for_each_entry(dev, &bus->devices, bus_list) {
119
120 BUG_ON(list_empty(&dev->global_list));
121
122 /*
123 * If there is an unattached subordinate bus, attach
124 * it and then scan for unattached PCI devices.
125 */
Rajesh Shah6ef6f0e2005-04-28 00:25:49 -0700126 if (dev->subordinate) {
127 if (list_empty(&dev->subordinate->node)) {
128 spin_lock(&pci_bus_lock);
129 list_add_tail(&dev->subordinate->node,
130 &dev->bus->children);
131 spin_unlock(&pci_bus_lock);
132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 pci_bus_add_devices(dev->subordinate);
134
135 sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
136 }
137 }
138}
139
140void pci_enable_bridges(struct pci_bus *bus)
141{
142 struct pci_dev *dev;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700143 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 list_for_each_entry(dev, &bus->devices, bus_list) {
146 if (dev->subordinate) {
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700147 retval = pci_enable_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 pci_set_master(dev);
149 pci_enable_bridges(dev->subordinate);
150 }
151 }
152}
153
Paul Mackerrascecf4862005-08-18 14:33:01 +1000154/** pci_walk_bus - walk devices on/under bus, calling callback.
155 * @top bus whose devices should be walked
156 * @cb callback to be called for each device found
157 * @userdata arbitrary pointer to be passed to callback.
158 *
159 * Walk the given bus, including any bridged devices
160 * on buses under this bus. Call the provided callback
161 * on each device found.
162 */
163void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
164 void *userdata)
165{
166 struct pci_dev *dev;
167 struct pci_bus *bus;
168 struct list_head *next;
169
170 bus = top;
171 spin_lock(&pci_bus_lock);
172 next = top->devices.next;
173 for (;;) {
174 if (next == &bus->devices) {
175 /* end of this bus, go up or finish */
176 if (bus == top)
177 break;
178 next = bus->self->bus_list.next;
179 bus = bus->self->bus;
180 continue;
181 }
182 dev = list_entry(next, struct pci_dev, bus_list);
183 pci_dev_get(dev);
184 if (dev->subordinate) {
185 /* this is a pci-pci bridge, do its devices next */
186 next = dev->subordinate->devices.next;
187 bus = dev->subordinate;
188 } else
189 next = dev->bus_list.next;
190 spin_unlock(&pci_bus_lock);
191
192 /* Run device routines with the bus unlocked */
193 cb(dev, userdata);
194
195 spin_lock(&pci_bus_lock);
196 pci_dev_put(dev);
197 }
198 spin_unlock(&pci_bus_lock);
199}
200EXPORT_SYMBOL_GPL(pci_walk_bus);
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202EXPORT_SYMBOL(pci_bus_alloc_resource);
203EXPORT_SYMBOL_GPL(pci_bus_add_device);
204EXPORT_SYMBOL(pci_bus_add_devices);
205EXPORT_SYMBOL(pci_enable_bridges);