1 | /* Driver Manager Interface Implementation. |
---|
2 | * |
---|
3 | * COPYRIGHT (c) 2009 Cobham Gaisler AB. |
---|
4 | * |
---|
5 | * The license and distribution terms for this file may be |
---|
6 | * found in the file LICENSE in this distribution or at |
---|
7 | * http://www.rtems.com/license/LICENSE. |
---|
8 | */ |
---|
9 | |
---|
10 | #include <stdio.h> |
---|
11 | #include <stdlib.h> |
---|
12 | #include <string.h> |
---|
13 | |
---|
14 | #include <drvmgr/drvmgr.h> |
---|
15 | #include <drvmgr/drvmgr_confdefs.h> |
---|
16 | |
---|
17 | #include "drvmgr_internal.h" |
---|
18 | |
---|
19 | /* Enable debugging */ |
---|
20 | /*#define DEBUG 1*/ |
---|
21 | |
---|
22 | #ifdef DEBUG |
---|
23 | #define DBG(x...) printk(x) |
---|
24 | #else |
---|
25 | #define DBG(x...) |
---|
26 | #endif |
---|
27 | |
---|
28 | struct rtems_driver_manager drv_mgr = { |
---|
29 | .level = 0, |
---|
30 | .initializing_objs = 0, |
---|
31 | .lock = 0, |
---|
32 | .root_dev = {0}, |
---|
33 | .root_drv = NULL, |
---|
34 | |
---|
35 | .drivers = LIST_INITIALIZER(struct drvmgr_drv, next), |
---|
36 | |
---|
37 | .buses = { |
---|
38 | LIST_INITIALIZER(struct drvmgr_bus, next), |
---|
39 | LIST_INITIALIZER(struct drvmgr_bus, next), |
---|
40 | LIST_INITIALIZER(struct drvmgr_bus, next), |
---|
41 | LIST_INITIALIZER(struct drvmgr_bus, next), |
---|
42 | LIST_INITIALIZER(struct drvmgr_bus, next), |
---|
43 | }, |
---|
44 | .buses_inactive = LIST_INITIALIZER(struct drvmgr_bus, next), |
---|
45 | |
---|
46 | .devices = { |
---|
47 | LIST_INITIALIZER(struct drvmgr_dev, next), |
---|
48 | LIST_INITIALIZER(struct drvmgr_dev, next), |
---|
49 | LIST_INITIALIZER(struct drvmgr_dev, next), |
---|
50 | LIST_INITIALIZER(struct drvmgr_dev, next), |
---|
51 | LIST_INITIALIZER(struct drvmgr_dev, next), |
---|
52 | }, |
---|
53 | .devices_inactive = LIST_INITIALIZER(struct drvmgr_dev, next), |
---|
54 | }; |
---|
55 | |
---|
56 | static int do_bus_init( |
---|
57 | struct rtems_driver_manager *mgr, |
---|
58 | struct drvmgr_bus *bus, |
---|
59 | int level); |
---|
60 | static int do_dev_init( |
---|
61 | struct rtems_driver_manager *mgr, |
---|
62 | struct drvmgr_dev *dev, |
---|
63 | int level); |
---|
64 | |
---|
65 | /* DRIVER MANAGER */ |
---|
66 | |
---|
67 | void _DRV_Manager_init_level(int level) |
---|
68 | { |
---|
69 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
70 | |
---|
71 | if (mgr->level >= level) |
---|
72 | return; |
---|
73 | |
---|
74 | /* Set new Level */ |
---|
75 | mgr->level = level; |
---|
76 | |
---|
77 | /* Initialize buses and devices into this new level */ |
---|
78 | drvmgr_init_update(); |
---|
79 | } |
---|
80 | |
---|
81 | /* Initialize Data structures of the driver manager and call driver |
---|
82 | * register functions configured by the user. |
---|
83 | */ |
---|
84 | void _DRV_Manager_initialization(void) |
---|
85 | { |
---|
86 | struct drvmgr_drv_reg_func *drvreg; |
---|
87 | |
---|
88 | /* drv_mgr is already initialized statically by compiler except |
---|
89 | * the lock |
---|
90 | */ |
---|
91 | DRVMGR_LOCK_INIT(); |
---|
92 | |
---|
93 | /* Call driver register functions. */ |
---|
94 | drvreg = &drvmgr_drivers[0]; |
---|
95 | while (drvreg->drv_reg) { |
---|
96 | /* Make driver register */ |
---|
97 | drvreg->drv_reg(); |
---|
98 | drvreg++; |
---|
99 | } |
---|
100 | } |
---|
101 | |
---|
102 | /* Take ready devices and buses into the correct init level step by step. |
---|
103 | * Once a bus or a device has been registered there is no turning |
---|
104 | * back - they are taken to the level of the driver manager. |
---|
105 | */ |
---|
106 | void drvmgr_init_update(void) |
---|
107 | { |
---|
108 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
109 | struct drvmgr_bus *bus; |
---|
110 | struct drvmgr_dev *dev; |
---|
111 | int bus_might_been_registered; |
---|
112 | int level; |
---|
113 | |
---|
114 | /* "Lock" to make sure we don't use up the stack and that the lists |
---|
115 | * remain consistent. |
---|
116 | */ |
---|
117 | DRVMGR_LOCK_WRITE(); |
---|
118 | if (mgr->initializing_objs || (mgr->level == 0)) |
---|
119 | goto out; |
---|
120 | mgr->initializing_objs = 1; |
---|
121 | |
---|
122 | init_registered_buses: |
---|
123 | /* Take all buses and devices ready into the same stage |
---|
124 | * as the driver manager global level. |
---|
125 | */ |
---|
126 | for (level = 0; level < mgr->level; level++) { |
---|
127 | |
---|
128 | bus_might_been_registered = 0; |
---|
129 | |
---|
130 | /* Take buses into next level */ |
---|
131 | |
---|
132 | while ((bus = BUS_LIST_HEAD(&mgr->buses[level])) != NULL) { |
---|
133 | |
---|
134 | /* Remove first in the list (will be inserted in |
---|
135 | * appropriate list by do_bus_init()) |
---|
136 | */ |
---|
137 | drvmgr_list_remove_head(&mgr->buses[level]); |
---|
138 | |
---|
139 | DRVMGR_UNLOCK(); |
---|
140 | |
---|
141 | /* Initialize Bus, this will register devices on |
---|
142 | * the bus. Take bus into next level. |
---|
143 | */ |
---|
144 | do_bus_init(mgr, bus, level+1); |
---|
145 | |
---|
146 | DRVMGR_LOCK_WRITE(); |
---|
147 | } |
---|
148 | |
---|
149 | /* Take devices into next level */ |
---|
150 | while ((dev = DEV_LIST_HEAD(&mgr->devices[level])) != NULL) { |
---|
151 | |
---|
152 | /* Always process first in list */ |
---|
153 | dev = DEV_LIST_HEAD(&mgr->devices[level]); |
---|
154 | |
---|
155 | /* Remove first in the list (will be inserted in |
---|
156 | * appropriate list by do_dev_init()) |
---|
157 | */ |
---|
158 | drvmgr_list_remove_head(&mgr->devices[level]); |
---|
159 | |
---|
160 | DRVMGR_UNLOCK(); |
---|
161 | |
---|
162 | /* Initialize Device, this may register a new bus */ |
---|
163 | do_dev_init(mgr, dev, level+1); |
---|
164 | |
---|
165 | DRVMGR_LOCK_WRITE(); |
---|
166 | |
---|
167 | bus_might_been_registered = 1; |
---|
168 | } |
---|
169 | |
---|
170 | /* Make sure all buses registered and ready are taken at |
---|
171 | * the same time into init level N. |
---|
172 | */ |
---|
173 | if (bus_might_been_registered) |
---|
174 | goto init_registered_buses; |
---|
175 | } |
---|
176 | |
---|
177 | /* Release bus/device initialization "Lock" */ |
---|
178 | mgr->initializing_objs = 0; |
---|
179 | |
---|
180 | out: |
---|
181 | DRVMGR_UNLOCK(); |
---|
182 | } |
---|
183 | |
---|
184 | /* Take bus into next level */ |
---|
185 | static int do_bus_init( |
---|
186 | struct rtems_driver_manager *mgr, |
---|
187 | struct drvmgr_bus *bus, |
---|
188 | int level) |
---|
189 | { |
---|
190 | int (*init)(struct drvmgr_bus *); |
---|
191 | |
---|
192 | /* If bridge device has failed during initialization, the bus is not |
---|
193 | * initialized further. |
---|
194 | */ |
---|
195 | if (bus->dev->state & DEV_STATE_INIT_FAILED) { |
---|
196 | bus->state |= BUS_STATE_DEPEND_FAILED; |
---|
197 | goto inactivate_out; |
---|
198 | } |
---|
199 | |
---|
200 | if (bus->ops && (init = bus->ops->init[level-1])) { |
---|
201 | /* Note: This init1 function may register new devices */ |
---|
202 | bus->error = init(bus); |
---|
203 | if (bus->error != DRVMGR_OK) { |
---|
204 | /* An error of some kind during bus initialization. |
---|
205 | * |
---|
206 | * Child devices and their buses are not inactived |
---|
207 | * directly here, instead they will all be catched by |
---|
208 | * do_dev_init() and do_bus_init() by checking if |
---|
209 | * parent or bridge-device failed. We know that |
---|
210 | * initialization will happen later for those devices. |
---|
211 | */ |
---|
212 | goto inactivate_out; |
---|
213 | } |
---|
214 | } |
---|
215 | |
---|
216 | DRVMGR_LOCK_WRITE(); |
---|
217 | |
---|
218 | /* Bus taken into the new level */ |
---|
219 | bus->level = level; |
---|
220 | |
---|
221 | /* Put bus into list of buses reached level 'level'. |
---|
222 | * Put at end of bus list so that init[N+1]() calls comes |
---|
223 | * in the same order as init[N]() |
---|
224 | */ |
---|
225 | drvmgr_list_add_tail(&mgr->buses[level], bus); |
---|
226 | |
---|
227 | DRVMGR_UNLOCK(); |
---|
228 | |
---|
229 | return 0; |
---|
230 | |
---|
231 | inactivate_out: |
---|
232 | DRVMGR_LOCK_WRITE(); |
---|
233 | bus->state |= BUS_STATE_INIT_FAILED; |
---|
234 | bus->state |= BUS_STATE_LIST_INACTIVE; |
---|
235 | drvmgr_list_add_head(&mgr->buses_inactive, bus); |
---|
236 | DRVMGR_UNLOCK(); |
---|
237 | |
---|
238 | DBG("do_bus_init(%d): (DEV: %s) failed\n", level, bus->dev->name); |
---|
239 | |
---|
240 | return 1; |
---|
241 | } |
---|
242 | |
---|
243 | /* Take device to initialization level 1 */ |
---|
244 | static int do_dev_init( |
---|
245 | struct rtems_driver_manager *mgr, |
---|
246 | struct drvmgr_dev *dev, |
---|
247 | int level) |
---|
248 | { |
---|
249 | int (*init)(struct drvmgr_dev *); |
---|
250 | |
---|
251 | /* Try to allocate Private Device Structure for driver if driver |
---|
252 | * requests for this feature. |
---|
253 | */ |
---|
254 | if (dev->drv && dev->drv->dev_priv_size && !dev->priv) { |
---|
255 | dev->priv = malloc(dev->drv->dev_priv_size); |
---|
256 | memset(dev->priv, 0, dev->drv->dev_priv_size); |
---|
257 | } |
---|
258 | |
---|
259 | /* If parent bus has failed during initialization, |
---|
260 | * the device is not initialized further. |
---|
261 | */ |
---|
262 | if (dev->parent && (dev->parent->state & BUS_STATE_INIT_FAILED)) { |
---|
263 | dev->state |= DEV_STATE_DEPEND_FAILED; |
---|
264 | goto inactivate_out; |
---|
265 | } |
---|
266 | |
---|
267 | /* Call Driver's Init Routine */ |
---|
268 | if (dev->drv && (init = dev->drv->ops->init[level-1])) { |
---|
269 | /* Note: This init function may register new devices */ |
---|
270 | dev->error = init(dev); |
---|
271 | if (dev->error != DRVMGR_OK) { |
---|
272 | /* An error of some kind has occured in the |
---|
273 | * driver/device, the failed device is put into the |
---|
274 | * inactive list, this way Init2,3 and/or 4 will not |
---|
275 | * be called for this device. |
---|
276 | * |
---|
277 | * The device is not removed from the bus (not |
---|
278 | * unregistered). The driver can be used to find |
---|
279 | * device information and debugging for example even |
---|
280 | * if device initialization failed. |
---|
281 | * |
---|
282 | * Child buses and their devices are not inactived |
---|
283 | * directly here, instead they will all be catched by |
---|
284 | * do_dev_init() and do_bus_init() by checking if |
---|
285 | * parent or bridge-device failed. We know that |
---|
286 | * initialization will happen later for those devices. |
---|
287 | */ |
---|
288 | goto inactivate_out; |
---|
289 | } |
---|
290 | } |
---|
291 | |
---|
292 | DRVMGR_LOCK_WRITE(); |
---|
293 | /* Dev taken into new level */ |
---|
294 | dev->level = level; |
---|
295 | |
---|
296 | /* Put at end of device list so that init[N+1]() calls comes |
---|
297 | * in the same order as init[N]() |
---|
298 | */ |
---|
299 | drvmgr_list_add_tail(&mgr->devices[level], dev); |
---|
300 | DRVMGR_UNLOCK(); |
---|
301 | |
---|
302 | return 0; |
---|
303 | |
---|
304 | inactivate_out: |
---|
305 | DRVMGR_LOCK_WRITE(); |
---|
306 | dev->state |= DEV_STATE_INIT_FAILED; |
---|
307 | dev->state |= DEV_STATE_LIST_INACTIVE; |
---|
308 | drvmgr_list_add_head(&mgr->devices_inactive, dev); |
---|
309 | DRVMGR_UNLOCK(); |
---|
310 | |
---|
311 | DBG("do_dev_init(%d): DRV: %s (DEV: %s) failed\n", |
---|
312 | level, dev->drv->name, dev->name); |
---|
313 | |
---|
314 | return 1; /* Failed to take device into requested level */ |
---|
315 | } |
---|
316 | |
---|
317 | /* Register Root device driver */ |
---|
318 | int drvmgr_root_drv_register(struct drvmgr_drv *drv) |
---|
319 | { |
---|
320 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
321 | struct drvmgr_dev *root = &mgr->root_dev; |
---|
322 | |
---|
323 | if (mgr->root_drv) { |
---|
324 | /* Only possible to register root device once */ |
---|
325 | return DRVMGR_FAIL; |
---|
326 | } |
---|
327 | |
---|
328 | /* Set root device driver */ |
---|
329 | drv->next = NULL; |
---|
330 | mgr->root_drv = drv; |
---|
331 | |
---|
332 | /* Init root device non-NULL fields */ |
---|
333 | root->minor_drv = -1; |
---|
334 | root->minor_bus = 0; |
---|
335 | root->businfo = mgr; |
---|
336 | root->name = "root bus"; |
---|
337 | /* Custom Driver association */ |
---|
338 | root->drv = mgr->root_drv; |
---|
339 | |
---|
340 | /* This registers the root device and a bus */ |
---|
341 | drvmgr_dev_register(root); |
---|
342 | |
---|
343 | return DRVMGR_OK; |
---|
344 | } |
---|
345 | |
---|
346 | /* Register a driver */ |
---|
347 | int drvmgr_drv_register(struct drvmgr_drv *drv) |
---|
348 | { |
---|
349 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
350 | |
---|
351 | /* All drivers must have been registered before start of init, |
---|
352 | * because the manager does not scan all existing devices to find |
---|
353 | * suitable hardware for this driver, and it is not protected with |
---|
354 | * a lock therefore. |
---|
355 | */ |
---|
356 | if (mgr->level > 0) |
---|
357 | return -1; |
---|
358 | |
---|
359 | drv->obj_type = DRVMGR_OBJ_DRV; |
---|
360 | |
---|
361 | /* Put driver into list of registered drivers */ |
---|
362 | drvmgr_list_add_head(&mgr->drivers, drv); |
---|
363 | |
---|
364 | /* TODO: we could scan for devices that this new driver has support |
---|
365 | * for. However, at this stage we assume that all drivers are |
---|
366 | * registered before devices are registered. |
---|
367 | * |
---|
368 | * LOCK: From the same assumsion locking the driver list is not needed |
---|
369 | * either. |
---|
370 | */ |
---|
371 | |
---|
372 | return 0; |
---|
373 | } |
---|
374 | |
---|
375 | /* Insert a device into a driver's device list and assign a driver minor number |
---|
376 | * to the device. |
---|
377 | * |
---|
378 | * The devices are ordered by their minor number (sorted linked list of devices) |
---|
379 | * the minor number is found by looking for a gap or at the end. |
---|
380 | */ |
---|
381 | static void drvmgr_insert_dev_into_drv( |
---|
382 | struct drvmgr_drv *drv, |
---|
383 | struct drvmgr_dev *dev) |
---|
384 | { |
---|
385 | struct drvmgr_dev *curr, **pprevnext; |
---|
386 | int minor; |
---|
387 | |
---|
388 | minor = 0; |
---|
389 | pprevnext = &drv->dev; |
---|
390 | curr = drv->dev; |
---|
391 | |
---|
392 | while (curr) { |
---|
393 | if (minor < curr->minor_drv) { |
---|
394 | /* Found a gap. Insert new device between prev |
---|
395 | * and curr. */ |
---|
396 | break; |
---|
397 | } |
---|
398 | minor++; |
---|
399 | pprevnext = &curr->next_in_drv; |
---|
400 | curr = curr->next_in_drv; |
---|
401 | } |
---|
402 | dev->next_in_drv = curr; |
---|
403 | *pprevnext = dev; |
---|
404 | |
---|
405 | /* Set minor */ |
---|
406 | dev->minor_drv = minor; |
---|
407 | drv->dev_cnt++; |
---|
408 | } |
---|
409 | |
---|
410 | /* Insert a device into a bus device list and assign a bus minor number to the |
---|
411 | * device. |
---|
412 | * |
---|
413 | * The devices are ordered by their minor number (sorted linked list of devices) |
---|
414 | * and by their registeration order if not using the same driver. |
---|
415 | * |
---|
416 | * The minor number is found by looking for a gap or at the end. |
---|
417 | */ |
---|
418 | static void drvmgr_insert_dev_into_bus( |
---|
419 | struct drvmgr_bus *bus, |
---|
420 | struct drvmgr_dev *dev) |
---|
421 | { |
---|
422 | struct drvmgr_dev *curr, **pprevnext; |
---|
423 | int minor; |
---|
424 | |
---|
425 | minor = 0; |
---|
426 | pprevnext = &bus->children; |
---|
427 | curr = bus->children; |
---|
428 | |
---|
429 | while (curr) { |
---|
430 | if (dev->drv && (dev->drv == curr->drv)) { |
---|
431 | if (minor < curr->minor_bus) { |
---|
432 | /* Found a gap. Insert new device between prev |
---|
433 | * and curr. */ |
---|
434 | break; |
---|
435 | } |
---|
436 | minor++; |
---|
437 | } |
---|
438 | pprevnext = &curr->next_in_bus; |
---|
439 | curr = curr->next_in_bus; |
---|
440 | } |
---|
441 | dev->next_in_bus = curr; |
---|
442 | *pprevnext = dev; |
---|
443 | |
---|
444 | /* Set minor. Devices without driver are given -1 */ |
---|
445 | if (dev->drv == NULL) |
---|
446 | minor = -1; |
---|
447 | dev->minor_bus = minor; |
---|
448 | bus->dev_cnt++; |
---|
449 | } |
---|
450 | |
---|
451 | /* Try to find a driver for a device (unite a device with driver). |
---|
452 | * a device with a driver |
---|
453 | */ |
---|
454 | static struct drvmgr_drv *drvmgr_dev_find_drv( |
---|
455 | struct drvmgr_dev *dev) |
---|
456 | { |
---|
457 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
458 | struct drvmgr_drv *drv; |
---|
459 | |
---|
460 | /* NOTE: No locking is needed here since Driver list is supposed to be |
---|
461 | * initialized once during startup, we treat it as a static |
---|
462 | * read-only list |
---|
463 | */ |
---|
464 | |
---|
465 | /* Try to find a driver that can handle this device */ |
---|
466 | for (drv = DRV_LIST_HEAD(&mgr->drivers); drv; drv = drv->next) |
---|
467 | if (dev->parent->ops->unite(drv, dev) == 1) |
---|
468 | break; |
---|
469 | |
---|
470 | return drv; |
---|
471 | } |
---|
472 | |
---|
473 | /* Register a device */ |
---|
474 | int drvmgr_dev_register(struct drvmgr_dev *dev) |
---|
475 | { |
---|
476 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
477 | struct drvmgr_drv *drv; |
---|
478 | struct drvmgr_bus *bus = dev->parent; |
---|
479 | struct drvmgr_key *keys; |
---|
480 | struct drvmgr_list *init_list = &mgr->devices_inactive; |
---|
481 | |
---|
482 | DBG("DEV_REG: %s at bus \"%s\"\n", dev->name, |
---|
483 | bus && bus->dev && bus->dev->name ? bus->dev->name : "UNKNOWN"); |
---|
484 | |
---|
485 | /* Custom driver assocation? */ |
---|
486 | if (dev->drv) { |
---|
487 | drv = dev->drv; |
---|
488 | DBG("CUSTOM ASSOCIATION (%s to %s)\n", dev->name, drv->name); |
---|
489 | } else { |
---|
490 | /* Try to find a driver that can handle this device */ |
---|
491 | dev->drv = drv = drvmgr_dev_find_drv(dev); |
---|
492 | } |
---|
493 | |
---|
494 | DRVMGR_LOCK_WRITE(); |
---|
495 | |
---|
496 | /* Assign Bus Minor number and put into bus device list |
---|
497 | * unless root device. |
---|
498 | */ |
---|
499 | if (bus) |
---|
500 | drvmgr_insert_dev_into_bus(bus, dev); |
---|
501 | |
---|
502 | if (!drv) { |
---|
503 | /* No driver found that can handle this device, put into |
---|
504 | * inactive list |
---|
505 | */ |
---|
506 | dev->minor_drv = -1; |
---|
507 | dev->state |= DEV_STATE_LIST_INACTIVE; |
---|
508 | } else { |
---|
509 | /* United device with driver. |
---|
510 | * Put the device on the registered device list |
---|
511 | */ |
---|
512 | dev->state |= DEV_STATE_UNITED; |
---|
513 | |
---|
514 | /* Check if user want to skip this core. This is not a |
---|
515 | * normal request, however in a multi-processor system |
---|
516 | * the two(or more) RTEMS instances must not use the same |
---|
517 | * devices in a system, not reporting a device to |
---|
518 | * it's driver will effectively accomplish this. In a |
---|
519 | * non Plug & Play system one can easily avoid this |
---|
520 | * problem by not report the core, but in a Plug & Play |
---|
521 | * system the bus driver will report all found cores. |
---|
522 | * |
---|
523 | * To stop the two RTEMS instances from using the same |
---|
524 | * device the user can simply define a resource entry |
---|
525 | * for a certain device but set the keys field to NULL. |
---|
526 | */ |
---|
527 | if (drvmgr_keys_get(dev, &keys) == 0 && keys == NULL) { |
---|
528 | /* Found Driver resource entry point |
---|
529 | * for this device, it was NULL, this |
---|
530 | * indicates to skip the core. |
---|
531 | * |
---|
532 | * We put it into the inactive list |
---|
533 | * marking it as ignored. |
---|
534 | */ |
---|
535 | dev->state |= DEV_STATE_IGNORED; |
---|
536 | } else { |
---|
537 | /* Assign Driver Minor number and put into driver's |
---|
538 | * device list |
---|
539 | */ |
---|
540 | drvmgr_insert_dev_into_drv(drv, dev); |
---|
541 | |
---|
542 | /* Just register device, it will be initialized |
---|
543 | * later together with bus. |
---|
544 | * |
---|
545 | * At the end of the list (breadth first search) |
---|
546 | */ |
---|
547 | init_list = &mgr->devices[0]; |
---|
548 | |
---|
549 | DBG("Registered %s (DRV: %s) on %s\n", |
---|
550 | dev->name, drv->name, |
---|
551 | bus ? bus->dev->name : "NO PARENT"); |
---|
552 | } |
---|
553 | } |
---|
554 | |
---|
555 | drvmgr_list_add_tail(init_list, dev); |
---|
556 | |
---|
557 | DRVMGR_UNLOCK(); |
---|
558 | |
---|
559 | /* Trigger Device initialization if not root device and |
---|
560 | * has a driver |
---|
561 | */ |
---|
562 | if (bus && dev->drv) |
---|
563 | drvmgr_init_update(); |
---|
564 | |
---|
565 | return 0; |
---|
566 | } |
---|
567 | |
---|
568 | /* Register a bus */ |
---|
569 | int drvmgr_bus_register(struct drvmgr_bus *bus) |
---|
570 | { |
---|
571 | struct rtems_driver_manager *mgr = &drv_mgr; |
---|
572 | struct drvmgr_bus *bus_up; |
---|
573 | |
---|
574 | /* Get bus architecture depth - the distance from root bus */ |
---|
575 | bus->depth = 0; |
---|
576 | bus_up = bus->dev->parent; |
---|
577 | while (bus_up) { |
---|
578 | bus->depth++; |
---|
579 | bus_up = bus_up->dev->parent; |
---|
580 | } |
---|
581 | |
---|
582 | DRVMGR_LOCK_WRITE(); |
---|
583 | |
---|
584 | /* Put driver into list of found buses */ |
---|
585 | drvmgr_list_add_tail(&mgr->buses[0], bus); |
---|
586 | |
---|
587 | DRVMGR_UNLOCK(); |
---|
588 | |
---|
589 | /* Take bus into level1 and so on */ |
---|
590 | drvmgr_init_update(); |
---|
591 | |
---|
592 | return 0; |
---|
593 | } |
---|
594 | |
---|
595 | /* Allocate memory for a Device structure */ |
---|
596 | int drvmgr_alloc_dev(struct drvmgr_dev **pdev, int extra) |
---|
597 | { |
---|
598 | struct drvmgr_dev *dev; |
---|
599 | int size; |
---|
600 | |
---|
601 | size = ((sizeof(struct drvmgr_dev) + 3) & ~0x3) + extra; |
---|
602 | dev = (struct drvmgr_dev *)calloc(size, 1); |
---|
603 | if (!dev) { |
---|
604 | /* Failed to allocate device structure - critical error */ |
---|
605 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
---|
606 | } |
---|
607 | *pdev = dev; |
---|
608 | dev->obj_type = DRVMGR_OBJ_DEV; |
---|
609 | |
---|
610 | return 0; |
---|
611 | } |
---|
612 | |
---|
613 | /* Allocate memory for a Bus structure */ |
---|
614 | int drvmgr_alloc_bus(struct drvmgr_bus **pbus, int extra) |
---|
615 | { |
---|
616 | struct drvmgr_bus *bus; |
---|
617 | int size; |
---|
618 | |
---|
619 | size = ((sizeof(struct drvmgr_bus) + 3) & ~0x3) + extra; |
---|
620 | bus = (struct drvmgr_bus *)calloc(size, 1); |
---|
621 | if (!bus) { |
---|
622 | /* Failed to allocate device structure - critical error */ |
---|
623 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
---|
624 | } |
---|
625 | *pbus = bus; |
---|
626 | bus->obj_type = DRVMGR_OBJ_BUS; |
---|
627 | |
---|
628 | return 0; |
---|
629 | } |
---|
630 | |
---|
631 | /* Add driver resources to a bus instance */ |
---|
632 | void drvmgr_bus_res_add(struct drvmgr_bus *bus, |
---|
633 | struct drvmgr_bus_res *bres) |
---|
634 | { |
---|
635 | /* insert first in bus resource list. Locking isn't needed since |
---|
636 | * resources can only be added before resource requests are made. |
---|
637 | * When bus has been registered resources are considered a read-only |
---|
638 | * tree. |
---|
639 | */ |
---|
640 | bres->next = bus->reslist; |
---|
641 | bus->reslist = bres; |
---|
642 | } |
---|