blob: 3937adf4e5e5c04bd9d940648e6dc1d628c9a4f1 [file] [log] [blame]
David Shaohua Li4e10d122005-03-18 18:45:35 -05001/*
2 * Link physical devices with ACPI devices support
3 *
4 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
5 * Copyright (c) 2005 Intel Corp.
6 *
7 * This file is released under the GPLv2.
8 */
9#include <linux/init.h>
10#include <linux/list.h>
11#include <linux/device.h>
12#include <linux/rwsem.h>
13#include <linux/acpi.h>
14
15#define ACPI_GLUE_DEBUG 0
16#if ACPI_GLUE_DEBUG
17#define DBG(x...) printk(PREFIX x)
18#else
19#define DBG(x...)
20#endif
21static LIST_HEAD(bus_type_list);
22static DECLARE_RWSEM(bus_type_sem);
23
24int register_acpi_bus_type(struct acpi_bus_type *type)
25{
26 if (acpi_disabled)
27 return -ENODEV;
28 if (type && type->bus && type->find_device) {
29 down_write(&bus_type_sem);
30 list_add_tail(&type->list, &bus_type_list);
31 up_write(&bus_type_sem);
Len Brown4be44fc2005-08-05 00:44:28 -040032 printk(KERN_INFO PREFIX "bus type %s registered\n",
33 type->bus->name);
David Shaohua Li4e10d122005-03-18 18:45:35 -050034 return 0;
35 }
36 return -ENODEV;
37}
38
39EXPORT_SYMBOL(register_acpi_bus_type);
40
41int unregister_acpi_bus_type(struct acpi_bus_type *type)
42{
43 if (acpi_disabled)
44 return 0;
45 if (type) {
46 down_write(&bus_type_sem);
47 list_del_init(&type->list);
48 up_write(&bus_type_sem);
Len Brown4be44fc2005-08-05 00:44:28 -040049 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
50 type->bus->name);
David Shaohua Li4e10d122005-03-18 18:45:35 -050051 return 0;
52 }
53 return -ENODEV;
54}
55
56EXPORT_SYMBOL(unregister_acpi_bus_type);
57
58static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
59{
60 struct acpi_bus_type *tmp, *ret = NULL;
61
62 down_read(&bus_type_sem);
63 list_for_each_entry(tmp, &bus_type_list, list) {
64 if (tmp->bus == type) {
65 ret = tmp;
66 break;
67 }
68 }
69 up_read(&bus_type_sem);
70 return ret;
71}
72
73static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
74{
75 struct acpi_bus_type *tmp;
76 int ret = -ENODEV;
77
78 down_read(&bus_type_sem);
79 list_for_each_entry(tmp, &bus_type_list, list) {
80 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
81 ret = 0;
82 break;
83 }
84 }
85 up_read(&bus_type_sem);
86 return ret;
87}
88
89/* Get PCI root bridge's handle from its segment and bus number */
90struct acpi_find_pci_root {
91 unsigned int seg;
92 unsigned int bus;
93 acpi_handle handle;
94};
95
96static acpi_status
97do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
98{
Peter Chubb51b190b2005-10-19 22:45:14 -070099 unsigned long *busnr = (unsigned long *)data;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500100 struct acpi_resource_address64 address;
101
102 if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
103 resource->id != ACPI_RSTYPE_ADDRESS32 &&
104 resource->id != ACPI_RSTYPE_ADDRESS64)
105 return AE_OK;
106
107 acpi_resource_to_address64(resource, &address);
108 if ((address.address_length > 0) &&
109 (address.resource_type == ACPI_BUS_NUMBER_RANGE))
110 *busnr = address.min_address_range;
111
112 return AE_OK;
113}
114
115static int get_root_bridge_busnr(acpi_handle handle)
116{
117 acpi_status status;
Peter Chubb51b190b2005-10-19 22:45:14 -0700118 unsigned long bus, bbn;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500119 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
120
121 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
122
123 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
Peter Chubb51b190b2005-10-19 22:45:14 -0700124 &bbn);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500125 if (status == AE_NOT_FOUND) {
126 /* Assume bus = 0 */
127 printk(KERN_INFO PREFIX
128 "Assume root bridge [%s] bus is 0\n",
129 (char *)buffer.pointer);
130 status = AE_OK;
131 bbn = 0;
132 }
133 if (ACPI_FAILURE(status)) {
134 bbn = -ENODEV;
135 goto exit;
136 }
137 if (bbn > 0)
138 goto exit;
139
140 /* _BBN in some systems return 0 for all root bridges */
141 bus = -1;
142 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
143 do_root_bridge_busnr_callback, &bus);
144 /* If _CRS failed, we just use _BBN */
145 if (ACPI_FAILURE(status) || (bus == -1))
146 goto exit;
147 /* We select _CRS */
148 if (bbn != bus) {
149 printk(KERN_INFO PREFIX
150 "_BBN and _CRS returns different value for %s. Select _CRS\n",
151 (char *)buffer.pointer);
152 bbn = bus;
153 }
154 exit:
155 acpi_os_free(buffer.pointer);
Peter Chubb51b190b2005-10-19 22:45:14 -0700156 return (int)bbn;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500157}
158
159static acpi_status
160find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
161{
162 struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
163 unsigned long seg, bus;
164 acpi_status status;
165 int tmp;
166 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
167
168 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
169
170 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
171 if (status == AE_NOT_FOUND) {
172 /* Assume seg = 0 */
David Shaohua Li4e10d122005-03-18 18:45:35 -0500173 status = AE_OK;
174 seg = 0;
175 }
176 if (ACPI_FAILURE(status)) {
177 status = AE_CTRL_DEPTH;
178 goto exit;
179 }
180
181 tmp = get_root_bridge_busnr(handle);
182 if (tmp < 0) {
183 printk(KERN_ERR PREFIX
184 "Find root bridge failed for %s\n",
185 (char *)buffer.pointer);
186 status = AE_CTRL_DEPTH;
187 goto exit;
188 }
189 bus = tmp;
190
191 if (seg == find->seg && bus == find->bus)
192 find->handle = handle;
193 status = AE_OK;
194 exit:
195 acpi_os_free(buffer.pointer);
196 return status;
197}
198
199acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
200{
201 struct acpi_find_pci_root find = { seg, bus, NULL };
202
203 acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
204 return find.handle;
205}
206
207/* Get device's handler per its address under its parent */
208struct acpi_find_child {
209 acpi_handle handle;
210 acpi_integer address;
211};
212
213static acpi_status
214do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
215{
216 acpi_status status;
217 struct acpi_device_info *info;
218 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
219 struct acpi_find_child *find = (struct acpi_find_child *)context;
220
221 status = acpi_get_object_info(handle, &buffer);
222 if (ACPI_SUCCESS(status)) {
223 info = buffer.pointer;
224 if (info->address == find->address)
225 find->handle = handle;
226 acpi_os_free(buffer.pointer);
227 }
228 return AE_OK;
229}
230
231acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
232{
233 struct acpi_find_child find = { NULL, address };
234
235 if (!parent)
236 return NULL;
237 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
238 1, do_acpi_find_child, &find, NULL);
239 return find.handle;
240}
241
242EXPORT_SYMBOL(acpi_get_child);
243
244/* Link ACPI devices with physical devices */
245static void acpi_glue_data_handler(acpi_handle handle,
246 u32 function, void *context)
247{
248 /* we provide an empty handler */
249}
250
251/* Note: a success call will increase reference count by one */
252struct device *acpi_get_physical_device(acpi_handle handle)
253{
254 acpi_status status;
255 struct device *dev;
256
257 status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
258 if (ACPI_SUCCESS(status))
259 return get_device(dev);
260 return NULL;
261}
262
263EXPORT_SYMBOL(acpi_get_physical_device);
264
265static int acpi_bind_one(struct device *dev, acpi_handle handle)
266{
267 acpi_status status;
268
269 if (dev->firmware_data) {
270 printk(KERN_WARNING PREFIX
271 "Drivers changed 'firmware_data' for %s\n", dev->bus_id);
272 return -EINVAL;
273 }
274 get_device(dev);
275 status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
276 if (ACPI_FAILURE(status)) {
277 put_device(dev);
278 return -EINVAL;
279 }
280 dev->firmware_data = handle;
281
282 return 0;
283}
284
285static int acpi_unbind_one(struct device *dev)
286{
287 if (!dev->firmware_data)
288 return 0;
289 if (dev == acpi_get_physical_device(dev->firmware_data)) {
290 /* acpi_get_physical_device increase refcnt by one */
291 put_device(dev);
292 acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
293 dev->firmware_data = NULL;
294 /* acpi_bind_one increase refcnt by one */
295 put_device(dev);
296 } else {
297 printk(KERN_ERR PREFIX
298 "Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
299 }
300 return 0;
301}
302
303static int acpi_platform_notify(struct device *dev)
304{
305 struct acpi_bus_type *type;
306 acpi_handle handle;
307 int ret = -EINVAL;
308
309 if (!dev->bus || !dev->parent) {
310 /* bridge devices genernally haven't bus or parent */
311 ret = acpi_find_bridge_device(dev, &handle);
312 goto end;
313 }
314 type = acpi_get_bus_type(dev->bus);
315 if (!type) {
David Shaohua Lief7b06c2005-04-18 22:59:23 -0400316 DBG("No ACPI bus support for %s\n", dev->bus_id);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500317 ret = -EINVAL;
318 goto end;
319 }
320 if ((ret = type->find_device(dev, &handle)) != 0)
David Shaohua Lief7b06c2005-04-18 22:59:23 -0400321 DBG("Can't get handler for %s\n", dev->bus_id);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500322 end:
323 if (!ret)
324 acpi_bind_one(dev, handle);
325
326#if ACPI_GLUE_DEBUG
327 if (!ret) {
328 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
329
330 acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
331 DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
332 acpi_os_free(buffer.pointer);
333 } else
334 DBG("Device %s -> No ACPI support\n", dev->bus_id);
335#endif
336
337 return ret;
338}
339
340static int acpi_platform_notify_remove(struct device *dev)
341{
342 acpi_unbind_one(dev);
343 return 0;
344}
345
346static int __init init_acpi_device_notify(void)
347{
348 if (acpi_disabled)
349 return 0;
350 if (platform_notify || platform_notify_remove) {
351 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
352 return 0;
353 }
354 platform_notify = acpi_platform_notify;
355 platform_notify_remove = acpi_platform_notify_remove;
356 return 0;
357}
358
359arch_initcall(init_acpi_device_notify);