ASoC: ak4642: Add enhanced sampling rate
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / pci / bus.c
blob26301cb25e7f7cc682bd0f5ce102466a7810088b
1 /*
2 * drivers/pci/bus.c
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>
18 #include "pci.h"
20 void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
21 unsigned int flags)
23 struct pci_bus_resource *bus_res;
25 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
26 if (!bus_res) {
27 dev_err(&bus->dev, "can't add %pR resource\n", res);
28 return;
31 bus_res->res = res;
32 bus_res->flags = flags;
33 list_add_tail(&bus_res->list, &bus->resources);
36 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
38 struct pci_bus_resource *bus_res;
40 if (n < PCI_BRIDGE_RESOURCE_NUM)
41 return bus->resource[n];
43 n -= PCI_BRIDGE_RESOURCE_NUM;
44 list_for_each_entry(bus_res, &bus->resources, list) {
45 if (n-- == 0)
46 return bus_res->res;
48 return NULL;
50 EXPORT_SYMBOL_GPL(pci_bus_resource_n);
52 void pci_bus_remove_resources(struct pci_bus *bus)
54 struct pci_bus_resource *bus_res, *tmp;
55 int i;
57 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
58 bus->resource[i] = 0;
60 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
61 list_del(&bus_res->list);
62 kfree(bus_res);
66 /**
67 * pci_bus_alloc_resource - allocate a resource from a parent bus
68 * @bus: PCI bus
69 * @res: resource to allocate
70 * @size: size of resource to allocate
71 * @align: alignment of resource to allocate
72 * @min: minimum /proc/iomem address to allocate
73 * @type_mask: IORESOURCE_* type flags
74 * @alignf: resource alignment function
75 * @alignf_data: data argument for resource alignment function
77 * Given the PCI bus a device resides on, the size, minimum address,
78 * alignment and type, try to find an acceptable resource allocation
79 * for a specific device resource.
81 int
82 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
83 resource_size_t size, resource_size_t align,
84 resource_size_t min, unsigned int type_mask,
85 resource_size_t (*alignf)(void *,
86 const struct resource *,
87 resource_size_t,
88 resource_size_t),
89 void *alignf_data)
91 int i, ret = -ENOMEM;
92 struct resource *r;
93 resource_size_t max = -1;
95 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
97 /* don't allocate too high if the pref mem doesn't support 64bit*/
98 if (!(res->flags & IORESOURCE_MEM_64))
99 max = PCIBIOS_MAX_MEM_32;
101 pci_bus_for_each_resource(bus, r, i) {
102 if (!r)
103 continue;
105 /* type_mask must match */
106 if ((res->flags ^ r->flags) & type_mask)
107 continue;
109 /* We cannot allocate a non-prefetching resource
110 from a pre-fetching area */
111 if ((r->flags & IORESOURCE_PREFETCH) &&
112 !(res->flags & IORESOURCE_PREFETCH))
113 continue;
115 /* Ok, try it out.. */
116 ret = allocate_resource(r, res, size,
117 r->start ? : min,
118 max, align,
119 alignf, alignf_data);
120 if (ret == 0)
121 break;
123 return ret;
127 * pci_bus_add_device - add a single device
128 * @dev: device to add
130 * This adds a single pci device to the global
131 * device list and adds sysfs and procfs entries
133 int pci_bus_add_device(struct pci_dev *dev)
135 int retval;
136 retval = device_add(&dev->dev);
137 if (retval)
138 return retval;
140 dev->is_added = 1;
141 pci_proc_attach_device(dev);
142 pci_create_sysfs_dev_files(dev);
143 return 0;
147 * pci_bus_add_child - add a child bus
148 * @bus: bus to add
150 * This adds sysfs entries for a single bus
152 int pci_bus_add_child(struct pci_bus *bus)
154 int retval;
156 if (bus->bridge)
157 bus->dev.parent = bus->bridge;
159 retval = device_register(&bus->dev);
160 if (retval)
161 return retval;
163 bus->is_added = 1;
165 retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
166 if (retval)
167 return retval;
169 retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
171 /* Create legacy_io and legacy_mem files for this bus */
172 pci_create_legacy_files(bus);
174 return retval;
178 * pci_bus_add_devices - insert newly discovered PCI devices
179 * @bus: bus to check for new devices
181 * Add newly discovered PCI devices (which are on the bus->devices
182 * list) to the global PCI device list, add the sysfs and procfs
183 * entries. Where a bridge is found, add the discovered bus to
184 * the parents list of child buses, and recurse (breadth-first
185 * to be compatible with 2.4)
187 * Call hotplug for each new devices.
189 void pci_bus_add_devices(const struct pci_bus *bus)
191 struct pci_dev *dev;
192 struct pci_bus *child;
193 int retval;
195 list_for_each_entry(dev, &bus->devices, bus_list) {
196 /* Skip already-added devices */
197 if (dev->is_added)
198 continue;
199 retval = pci_bus_add_device(dev);
200 if (retval)
201 dev_err(&dev->dev, "Error adding device, continuing\n");
204 list_for_each_entry(dev, &bus->devices, bus_list) {
205 BUG_ON(!dev->is_added);
207 child = dev->subordinate;
209 * If there is an unattached subordinate bus, attach
210 * it and then scan for unattached PCI devices.
212 if (!child)
213 continue;
214 if (list_empty(&child->node)) {
215 down_write(&pci_bus_sem);
216 list_add_tail(&child->node, &dev->bus->children);
217 up_write(&pci_bus_sem);
219 pci_bus_add_devices(child);
222 * register the bus with sysfs as the parent is now
223 * properly registered.
225 if (child->is_added)
226 continue;
227 retval = pci_bus_add_child(child);
228 if (retval)
229 dev_err(&dev->dev, "Error adding bus, continuing\n");
233 void pci_enable_bridges(struct pci_bus *bus)
235 struct pci_dev *dev;
236 int retval;
238 list_for_each_entry(dev, &bus->devices, bus_list) {
239 if (dev->subordinate) {
240 if (!pci_is_enabled(dev)) {
241 retval = pci_enable_device(dev);
242 pci_set_master(dev);
244 pci_enable_bridges(dev->subordinate);
249 /** pci_walk_bus - walk devices on/under bus, calling callback.
250 * @top bus whose devices should be walked
251 * @cb callback to be called for each device found
252 * @userdata arbitrary pointer to be passed to callback.
254 * Walk the given bus, including any bridged devices
255 * on buses under this bus. Call the provided callback
256 * on each device found.
258 * We check the return of @cb each time. If it returns anything
259 * other than 0, we break out.
262 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
263 void *userdata)
265 struct pci_dev *dev;
266 struct pci_bus *bus;
267 struct list_head *next;
268 int retval;
270 bus = top;
271 down_read(&pci_bus_sem);
272 next = top->devices.next;
273 for (;;) {
274 if (next == &bus->devices) {
275 /* end of this bus, go up or finish */
276 if (bus == top)
277 break;
278 next = bus->self->bus_list.next;
279 bus = bus->self->bus;
280 continue;
282 dev = list_entry(next, struct pci_dev, bus_list);
283 if (dev->subordinate) {
284 /* this is a pci-pci bridge, do its devices next */
285 next = dev->subordinate->devices.next;
286 bus = dev->subordinate;
287 } else
288 next = dev->bus_list.next;
290 /* Run device routines with the device locked */
291 device_lock(&dev->dev);
292 retval = cb(dev, userdata);
293 device_unlock(&dev->dev);
294 if (retval)
295 break;
297 up_read(&pci_bus_sem);
300 EXPORT_SYMBOL(pci_bus_alloc_resource);
301 EXPORT_SYMBOL_GPL(pci_bus_add_device);
302 EXPORT_SYMBOL(pci_bus_add_devices);
303 EXPORT_SYMBOL(pci_enable_bridges);