diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pci/hotplug/acpiphp_core.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/pci/hotplug/acpiphp_core.c')
-rw-r--r-- | drivers/pci/hotplug/acpiphp_core.c | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c new file mode 100644 index 00000000000..4539e61a3dc --- /dev/null +++ b/drivers/pci/hotplug/acpiphp_core.c | |||
@@ -0,0 +1,453 @@ | |||
1 | /* | ||
2 | * ACPI PCI Hot Plug Controller Driver | ||
3 | * | ||
4 | * Copyright (C) 1995,2001 Compaq Computer Corporation | ||
5 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) | ||
6 | * Copyright (C) 2001 IBM Corp. | ||
7 | * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) | ||
8 | * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) | ||
9 | * Copyright (C) 2002,2003 NEC Corporation | ||
10 | * | ||
11 | * All rights reserved. | ||
12 | * | ||
13 | * This program is free software; you can redistribute it and/or modify | ||
14 | * it under the terms of the GNU General Public License as published by | ||
15 | * the Free Software Foundation; either version 2 of the License, or (at | ||
16 | * your option) any later version. | ||
17 | * | ||
18 | * This program is distributed in the hope that it will be useful, but | ||
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | ||
20 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | ||
21 | * NON INFRINGEMENT. See the GNU General Public License for more | ||
22 | * details. | ||
23 | * | ||
24 | * You should have received a copy of the GNU General Public License | ||
25 | * along with this program; if not, write to the Free Software | ||
26 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
27 | * | ||
28 | * Send feedback to <gregkh@us.ibm.com>, | ||
29 | * <t-kochi@bq.jp.nec.com> | ||
30 | * | ||
31 | */ | ||
32 | |||
33 | #include <linux/init.h> | ||
34 | #include <linux/module.h> | ||
35 | #include <linux/moduleparam.h> | ||
36 | |||
37 | #include <linux/kernel.h> | ||
38 | #include <linux/pci.h> | ||
39 | #include <linux/slab.h> | ||
40 | #include <linux/smp.h> | ||
41 | #include <linux/smp_lock.h> | ||
42 | #include "pci_hotplug.h" | ||
43 | #include "acpiphp.h" | ||
44 | |||
45 | static LIST_HEAD(slot_list); | ||
46 | |||
47 | #define MY_NAME "acpiphp" | ||
48 | |||
49 | static int debug; | ||
50 | int acpiphp_debug; | ||
51 | |||
52 | /* local variables */ | ||
53 | static int num_slots; | ||
54 | static struct acpiphp_attention_info *attention_info; | ||
55 | |||
56 | #define DRIVER_VERSION "0.4" | ||
57 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>" | ||
58 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" | ||
59 | |||
60 | MODULE_AUTHOR(DRIVER_AUTHOR); | ||
61 | MODULE_DESCRIPTION(DRIVER_DESC); | ||
62 | MODULE_LICENSE("GPL"); | ||
63 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); | ||
64 | module_param(debug, bool, 0644); | ||
65 | |||
66 | /* export the attention callback registration methods */ | ||
67 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); | ||
68 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); | ||
69 | |||
70 | static int enable_slot (struct hotplug_slot *slot); | ||
71 | static int disable_slot (struct hotplug_slot *slot); | ||
72 | static int set_attention_status (struct hotplug_slot *slot, u8 value); | ||
73 | static int get_power_status (struct hotplug_slot *slot, u8 *value); | ||
74 | static int get_attention_status (struct hotplug_slot *slot, u8 *value); | ||
75 | static int get_address (struct hotplug_slot *slot, u32 *value); | ||
76 | static int get_latch_status (struct hotplug_slot *slot, u8 *value); | ||
77 | static int get_adapter_status (struct hotplug_slot *slot, u8 *value); | ||
78 | |||
79 | static struct hotplug_slot_ops acpi_hotplug_slot_ops = { | ||
80 | .owner = THIS_MODULE, | ||
81 | .enable_slot = enable_slot, | ||
82 | .disable_slot = disable_slot, | ||
83 | .set_attention_status = set_attention_status, | ||
84 | .get_power_status = get_power_status, | ||
85 | .get_attention_status = get_attention_status, | ||
86 | .get_latch_status = get_latch_status, | ||
87 | .get_adapter_status = get_adapter_status, | ||
88 | .get_address = get_address, | ||
89 | }; | ||
90 | |||
91 | |||
92 | /** | ||
93 | * acpiphp_register_attention - set attention LED callback | ||
94 | * @info: must be completely filled with LED callbacks | ||
95 | * | ||
96 | * Description: this is used to register a hardware specific ACPI | ||
97 | * driver that manipulates the attention LED. All the fields in | ||
98 | * info must be set. | ||
99 | **/ | ||
100 | int acpiphp_register_attention(struct acpiphp_attention_info *info) | ||
101 | { | ||
102 | int retval = -EINVAL; | ||
103 | |||
104 | if (info && info->owner && info->set_attn && | ||
105 | info->get_attn && !attention_info) { | ||
106 | retval = 0; | ||
107 | attention_info = info; | ||
108 | } | ||
109 | return retval; | ||
110 | } | ||
111 | |||
112 | |||
113 | /** | ||
114 | * acpiphp_unregister_attention - unset attention LED callback | ||
115 | * @info: must match the pointer used to register | ||
116 | * | ||
117 | * Description: this is used to un-register a hardware specific acpi | ||
118 | * driver that manipulates the attention LED. The pointer to the | ||
119 | * info struct must be the same as the one used to set it. | ||
120 | **/ | ||
121 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) | ||
122 | { | ||
123 | int retval = -EINVAL; | ||
124 | |||
125 | if (info && attention_info == info) { | ||
126 | attention_info = NULL; | ||
127 | retval = 0; | ||
128 | } | ||
129 | return retval; | ||
130 | } | ||
131 | |||
132 | |||
133 | /** | ||
134 | * enable_slot - power on and enable a slot | ||
135 | * @hotplug_slot: slot to enable | ||
136 | * | ||
137 | * Actual tasks are done in acpiphp_enable_slot() | ||
138 | * | ||
139 | */ | ||
140 | static int enable_slot(struct hotplug_slot *hotplug_slot) | ||
141 | { | ||
142 | struct slot *slot = hotplug_slot->private; | ||
143 | |||
144 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
145 | |||
146 | /* enable the specified slot */ | ||
147 | return acpiphp_enable_slot(slot->acpi_slot); | ||
148 | } | ||
149 | |||
150 | |||
151 | /** | ||
152 | * disable_slot - disable and power off a slot | ||
153 | * @hotplug_slot: slot to disable | ||
154 | * | ||
155 | * Actual tasks are done in acpiphp_disable_slot() | ||
156 | * | ||
157 | */ | ||
158 | static int disable_slot(struct hotplug_slot *hotplug_slot) | ||
159 | { | ||
160 | struct slot *slot = hotplug_slot->private; | ||
161 | |||
162 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
163 | |||
164 | /* disable the specified slot */ | ||
165 | return acpiphp_disable_slot(slot->acpi_slot); | ||
166 | } | ||
167 | |||
168 | |||
169 | /** | ||
170 | * set_attention_status - set attention LED | ||
171 | * @hotplug_slot: slot to set attention LED on | ||
172 | * @status: value to set attention LED to (0 or 1) | ||
173 | * | ||
174 | * attention status LED, so we use a callback that | ||
175 | * was registered with us. This allows hardware specific | ||
176 | * ACPI implementations to blink the light for us. | ||
177 | **/ | ||
178 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | ||
179 | { | ||
180 | int retval = -ENODEV; | ||
181 | |||
182 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
183 | |||
184 | if (attention_info && try_module_get(attention_info->owner)) { | ||
185 | retval = attention_info->set_attn(hotplug_slot, status); | ||
186 | module_put(attention_info->owner); | ||
187 | } else | ||
188 | attention_info = NULL; | ||
189 | return retval; | ||
190 | } | ||
191 | |||
192 | |||
193 | /** | ||
194 | * get_power_status - get power status of a slot | ||
195 | * @hotplug_slot: slot to get status | ||
196 | * @value: pointer to store status | ||
197 | * | ||
198 | * Some platforms may not implement _STA method properly. | ||
199 | * In that case, the value returned may not be reliable. | ||
200 | * | ||
201 | */ | ||
202 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | ||
203 | { | ||
204 | struct slot *slot = hotplug_slot->private; | ||
205 | |||
206 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
207 | |||
208 | *value = acpiphp_get_power_status(slot->acpi_slot); | ||
209 | |||
210 | return 0; | ||
211 | } | ||
212 | |||
213 | |||
214 | /** | ||
215 | * get_attention_status - get attention LED status | ||
216 | * @hotplug_slot: slot to get status from | ||
217 | * @value: returns with value of attention LED | ||
218 | * | ||
219 | * ACPI doesn't have known method to determine the state | ||
220 | * of the attention status LED, so we use a callback that | ||
221 | * was registered with us. This allows hardware specific | ||
222 | * ACPI implementations to determine its state | ||
223 | **/ | ||
224 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) | ||
225 | { | ||
226 | int retval = -EINVAL; | ||
227 | |||
228 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
229 | |||
230 | if (attention_info && try_module_get(attention_info->owner)) { | ||
231 | retval = attention_info->get_attn(hotplug_slot, value); | ||
232 | module_put(attention_info->owner); | ||
233 | } else | ||
234 | attention_info = NULL; | ||
235 | return retval; | ||
236 | } | ||
237 | |||
238 | |||
239 | /** | ||
240 | * get_latch_status - get latch status of a slot | ||
241 | * @hotplug_slot: slot to get status | ||
242 | * @value: pointer to store status | ||
243 | * | ||
244 | * ACPI doesn't provide any formal means to access latch status. | ||
245 | * Instead, we fake latch status from _STA | ||
246 | * | ||
247 | */ | ||
248 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | ||
249 | { | ||
250 | struct slot *slot = hotplug_slot->private; | ||
251 | |||
252 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
253 | |||
254 | *value = acpiphp_get_latch_status(slot->acpi_slot); | ||
255 | |||
256 | return 0; | ||
257 | } | ||
258 | |||
259 | |||
260 | /** | ||
261 | * get_adapter_status - get adapter status of a slot | ||
262 | * @hotplug_slot: slot to get status | ||
263 | * @value: pointer to store status | ||
264 | * | ||
265 | * ACPI doesn't provide any formal means to access adapter status. | ||
266 | * Instead, we fake adapter status from _STA | ||
267 | * | ||
268 | */ | ||
269 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | ||
270 | { | ||
271 | struct slot *slot = hotplug_slot->private; | ||
272 | |||
273 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
274 | |||
275 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | ||
276 | |||
277 | return 0; | ||
278 | } | ||
279 | |||
280 | |||
281 | /** | ||
282 | * get_address - get pci address of a slot | ||
283 | * @hotplug_slot: slot to get status | ||
284 | * @busdev: pointer to struct pci_busdev (seg, bus, dev) | ||
285 | * | ||
286 | */ | ||
287 | static int get_address(struct hotplug_slot *hotplug_slot, u32 *value) | ||
288 | { | ||
289 | struct slot *slot = hotplug_slot->private; | ||
290 | |||
291 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
292 | |||
293 | *value = acpiphp_get_address(slot->acpi_slot); | ||
294 | |||
295 | return 0; | ||
296 | } | ||
297 | |||
298 | static int __init init_acpi(void) | ||
299 | { | ||
300 | int retval; | ||
301 | |||
302 | /* initialize internal data structure etc. */ | ||
303 | retval = acpiphp_glue_init(); | ||
304 | |||
305 | /* read initial number of slots */ | ||
306 | if (!retval) { | ||
307 | num_slots = acpiphp_get_num_slots(); | ||
308 | if (num_slots == 0) | ||
309 | retval = -ENODEV; | ||
310 | } | ||
311 | |||
312 | return retval; | ||
313 | } | ||
314 | |||
315 | |||
316 | /** | ||
317 | * make_slot_name - make a slot name that appears in pcihpfs | ||
318 | * @slot: slot to name | ||
319 | * | ||
320 | */ | ||
321 | static void make_slot_name(struct slot *slot) | ||
322 | { | ||
323 | snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%u", | ||
324 | slot->acpi_slot->sun); | ||
325 | } | ||
326 | |||
327 | /** | ||
328 | * release_slot - free up the memory used by a slot | ||
329 | * @hotplug_slot: slot to free | ||
330 | */ | ||
331 | static void release_slot(struct hotplug_slot *hotplug_slot) | ||
332 | { | ||
333 | struct slot *slot = hotplug_slot->private; | ||
334 | |||
335 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | ||
336 | |||
337 | kfree(slot->hotplug_slot->info); | ||
338 | kfree(slot->hotplug_slot->name); | ||
339 | kfree(slot->hotplug_slot); | ||
340 | kfree(slot); | ||
341 | } | ||
342 | |||
343 | /** | ||
344 | * init_slots - initialize 'struct slot' structures for each slot | ||
345 | * | ||
346 | */ | ||
347 | static int __init init_slots(void) | ||
348 | { | ||
349 | struct slot *slot; | ||
350 | int retval = -ENOMEM; | ||
351 | int i; | ||
352 | |||
353 | for (i = 0; i < num_slots; ++i) { | ||
354 | slot = kmalloc(sizeof(struct slot), GFP_KERNEL); | ||
355 | if (!slot) | ||
356 | goto error; | ||
357 | memset(slot, 0, sizeof(struct slot)); | ||
358 | |||
359 | slot->hotplug_slot = kmalloc(sizeof(struct hotplug_slot), GFP_KERNEL); | ||
360 | if (!slot->hotplug_slot) | ||
361 | goto error_slot; | ||
362 | memset(slot->hotplug_slot, 0, sizeof(struct hotplug_slot)); | ||
363 | |||
364 | slot->hotplug_slot->info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL); | ||
365 | if (!slot->hotplug_slot->info) | ||
366 | goto error_hpslot; | ||
367 | memset(slot->hotplug_slot->info, 0, sizeof(struct hotplug_slot_info)); | ||
368 | |||
369 | slot->hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL); | ||
370 | if (!slot->hotplug_slot->name) | ||
371 | goto error_info; | ||
372 | |||
373 | slot->number = i; | ||
374 | |||
375 | slot->hotplug_slot->private = slot; | ||
376 | slot->hotplug_slot->release = &release_slot; | ||
377 | slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; | ||
378 | |||
379 | slot->acpi_slot = get_slot_from_id(i); | ||
380 | slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); | ||
381 | slot->hotplug_slot->info->attention_status = 0; | ||
382 | slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); | ||
383 | slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); | ||
384 | slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN; | ||
385 | slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN; | ||
386 | |||
387 | make_slot_name(slot); | ||
388 | |||
389 | retval = pci_hp_register(slot->hotplug_slot); | ||
390 | if (retval) { | ||
391 | err("pci_hp_register failed with error %d\n", retval); | ||
392 | goto error_name; | ||
393 | } | ||
394 | |||
395 | /* add slot to our internal list */ | ||
396 | list_add(&slot->slot_list, &slot_list); | ||
397 | info("Slot [%s] registered\n", slot->hotplug_slot->name); | ||
398 | } | ||
399 | |||
400 | return 0; | ||
401 | error_name: | ||
402 | kfree(slot->hotplug_slot->name); | ||
403 | error_info: | ||
404 | kfree(slot->hotplug_slot->info); | ||
405 | error_hpslot: | ||
406 | kfree(slot->hotplug_slot); | ||
407 | error_slot: | ||
408 | kfree(slot); | ||
409 | error: | ||
410 | return retval; | ||
411 | } | ||
412 | |||
413 | |||
414 | static void __exit cleanup_slots (void) | ||
415 | { | ||
416 | struct list_head *tmp, *n; | ||
417 | struct slot *slot; | ||
418 | |||
419 | list_for_each_safe (tmp, n, &slot_list) { | ||
420 | /* memory will be freed in release_slot callback */ | ||
421 | slot = list_entry(tmp, struct slot, slot_list); | ||
422 | list_del(&slot->slot_list); | ||
423 | pci_hp_deregister(slot->hotplug_slot); | ||
424 | } | ||
425 | } | ||
426 | |||
427 | |||
428 | static int __init acpiphp_init(void) | ||
429 | { | ||
430 | int retval; | ||
431 | |||
432 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); | ||
433 | |||
434 | acpiphp_debug = debug; | ||
435 | |||
436 | /* read all the ACPI info from the system */ | ||
437 | retval = init_acpi(); | ||
438 | if (retval) | ||
439 | return retval; | ||
440 | |||
441 | return init_slots(); | ||
442 | } | ||
443 | |||
444 | |||
445 | static void __exit acpiphp_exit(void) | ||
446 | { | ||
447 | cleanup_slots(); | ||
448 | /* deallocate internal data structures etc. */ | ||
449 | acpiphp_glue_exit(); | ||
450 | } | ||
451 | |||
452 | module_init(acpiphp_init); | ||
453 | module_exit(acpiphp_exit); | ||