1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * RapidIO interconnect services |
4 | * (RapidIO Interconnect Specification, http://www.rapidio.org) |
5 | * |
6 | * Copyright 2005 MontaVista Software, Inc. |
7 | * Matt Porter <mporter@kernel.crashing.org> |
8 | * |
9 | * Copyright 2009 - 2013 Integrated Device Technology, Inc. |
10 | * Alex Bounine <alexandre.bounine@idt.com> |
11 | */ |
12 | |
13 | #include <linux/types.h> |
14 | #include <linux/kernel.h> |
15 | |
16 | #include <linux/delay.h> |
17 | #include <linux/init.h> |
18 | #include <linux/rio.h> |
19 | #include <linux/rio_drv.h> |
20 | #include <linux/rio_ids.h> |
21 | #include <linux/rio_regs.h> |
22 | #include <linux/module.h> |
23 | #include <linux/spinlock.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/interrupt.h> |
26 | |
27 | #include "rio.h" |
28 | |
29 | /* |
30 | * struct rio_pwrite - RIO portwrite event |
31 | * @node: Node in list of doorbell events |
32 | * @pwcback: Doorbell event callback |
33 | * @context: Handler specific context to pass on event |
34 | */ |
35 | struct rio_pwrite { |
36 | struct list_head node; |
37 | |
38 | int (*pwcback)(struct rio_mport *mport, void *context, |
39 | union rio_pw_msg *msg, int step); |
40 | void *context; |
41 | }; |
42 | |
43 | MODULE_DESCRIPTION("RapidIO Subsystem Core" ); |
44 | MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>" ); |
45 | MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>" ); |
46 | MODULE_LICENSE("GPL" ); |
47 | |
48 | static int hdid[RIO_MAX_MPORTS]; |
49 | static int ids_num; |
50 | module_param_array(hdid, int, &ids_num, 0); |
51 | MODULE_PARM_DESC(hdid, |
52 | "Destination ID assignment to local RapidIO controllers" ); |
53 | |
54 | static LIST_HEAD(rio_devices); |
55 | static LIST_HEAD(rio_nets); |
56 | static DEFINE_SPINLOCK(rio_global_list_lock); |
57 | |
58 | static LIST_HEAD(rio_mports); |
59 | static LIST_HEAD(rio_scans); |
60 | static DEFINE_MUTEX(rio_mport_list_lock); |
61 | static unsigned char next_portid; |
62 | static DEFINE_SPINLOCK(rio_mmap_lock); |
63 | |
64 | /** |
65 | * rio_local_get_device_id - Get the base/extended device id for a port |
66 | * @port: RIO master port from which to get the deviceid |
67 | * |
68 | * Reads the base/extended device id from the local device |
69 | * implementing the master port. Returns the 8/16-bit device |
70 | * id. |
71 | */ |
72 | u16 rio_local_get_device_id(struct rio_mport *port) |
73 | { |
74 | u32 result; |
75 | |
76 | rio_local_read_config_32(port, RIO_DID_CSR, data: &result); |
77 | |
78 | return (RIO_GET_DID(port->sys_size, result)); |
79 | } |
80 | EXPORT_SYMBOL_GPL(rio_local_get_device_id); |
81 | |
82 | /** |
83 | * rio_query_mport - Query mport device attributes |
84 | * @port: mport device to query |
85 | * @mport_attr: mport attributes data structure |
86 | * |
87 | * Returns attributes of specified mport through the |
88 | * pointer to attributes data structure. |
89 | */ |
90 | int rio_query_mport(struct rio_mport *port, |
91 | struct rio_mport_attr *mport_attr) |
92 | { |
93 | if (!port->ops->query_mport) |
94 | return -ENODATA; |
95 | return port->ops->query_mport(port, mport_attr); |
96 | } |
97 | EXPORT_SYMBOL(rio_query_mport); |
98 | |
99 | /** |
100 | * rio_alloc_net- Allocate and initialize a new RIO network data structure |
101 | * @mport: Master port associated with the RIO network |
102 | * |
103 | * Allocates a RIO network structure, initializes per-network |
104 | * list heads, and adds the associated master port to the |
105 | * network list of associated master ports. Returns a |
106 | * RIO network pointer on success or %NULL on failure. |
107 | */ |
108 | struct rio_net *rio_alloc_net(struct rio_mport *mport) |
109 | { |
110 | struct rio_net *net = kzalloc(size: sizeof(*net), GFP_KERNEL); |
111 | |
112 | if (net) { |
113 | INIT_LIST_HEAD(list: &net->node); |
114 | INIT_LIST_HEAD(list: &net->devices); |
115 | INIT_LIST_HEAD(list: &net->switches); |
116 | INIT_LIST_HEAD(list: &net->mports); |
117 | mport->net = net; |
118 | } |
119 | return net; |
120 | } |
121 | EXPORT_SYMBOL_GPL(rio_alloc_net); |
122 | |
123 | int rio_add_net(struct rio_net *net) |
124 | { |
125 | int err; |
126 | |
127 | err = device_register(dev: &net->dev); |
128 | if (err) |
129 | return err; |
130 | spin_lock(lock: &rio_global_list_lock); |
131 | list_add_tail(new: &net->node, head: &rio_nets); |
132 | spin_unlock(lock: &rio_global_list_lock); |
133 | |
134 | return 0; |
135 | } |
136 | EXPORT_SYMBOL_GPL(rio_add_net); |
137 | |
138 | void rio_free_net(struct rio_net *net) |
139 | { |
140 | spin_lock(lock: &rio_global_list_lock); |
141 | if (!list_empty(head: &net->node)) |
142 | list_del(entry: &net->node); |
143 | spin_unlock(lock: &rio_global_list_lock); |
144 | if (net->release) |
145 | net->release(net); |
146 | device_unregister(dev: &net->dev); |
147 | } |
148 | EXPORT_SYMBOL_GPL(rio_free_net); |
149 | |
150 | /** |
151 | * rio_local_set_device_id - Set the base/extended device id for a port |
152 | * @port: RIO master port |
153 | * @did: Device ID value to be written |
154 | * |
155 | * Writes the base/extended device id from a device. |
156 | */ |
157 | void rio_local_set_device_id(struct rio_mport *port, u16 did) |
158 | { |
159 | rio_local_write_config_32(port, RIO_DID_CSR, |
160 | RIO_SET_DID(port->sys_size, did)); |
161 | } |
162 | EXPORT_SYMBOL_GPL(rio_local_set_device_id); |
163 | |
164 | /** |
165 | * rio_add_device- Adds a RIO device to the device model |
166 | * @rdev: RIO device |
167 | * |
168 | * Adds the RIO device to the global device list and adds the RIO |
169 | * device to the RIO device list. Creates the generic sysfs nodes |
170 | * for an RIO device. |
171 | */ |
172 | int rio_add_device(struct rio_dev *rdev) |
173 | { |
174 | int err; |
175 | |
176 | atomic_set(v: &rdev->state, i: RIO_DEVICE_RUNNING); |
177 | err = device_register(dev: &rdev->dev); |
178 | if (err) |
179 | return err; |
180 | |
181 | spin_lock(lock: &rio_global_list_lock); |
182 | list_add_tail(new: &rdev->global_list, head: &rio_devices); |
183 | if (rdev->net) { |
184 | list_add_tail(new: &rdev->net_list, head: &rdev->net->devices); |
185 | if (rdev->pef & RIO_PEF_SWITCH) |
186 | list_add_tail(new: &rdev->rswitch->node, |
187 | head: &rdev->net->switches); |
188 | } |
189 | spin_unlock(lock: &rio_global_list_lock); |
190 | |
191 | return 0; |
192 | } |
193 | EXPORT_SYMBOL_GPL(rio_add_device); |
194 | |
195 | /* |
196 | * rio_del_device - removes a RIO device from the device model |
197 | * @rdev: RIO device |
198 | * @state: device state to set during removal process |
199 | * |
200 | * Removes the RIO device to the kernel device list and subsystem's device list. |
201 | * Clears sysfs entries for the removed device. |
202 | */ |
203 | void rio_del_device(struct rio_dev *rdev, enum rio_device_state state) |
204 | { |
205 | pr_debug("RIO: %s: removing %s\n" , __func__, rio_name(rdev)); |
206 | atomic_set(v: &rdev->state, i: state); |
207 | spin_lock(lock: &rio_global_list_lock); |
208 | list_del(entry: &rdev->global_list); |
209 | if (rdev->net) { |
210 | list_del(entry: &rdev->net_list); |
211 | if (rdev->pef & RIO_PEF_SWITCH) { |
212 | list_del(entry: &rdev->rswitch->node); |
213 | kfree(objp: rdev->rswitch->route_table); |
214 | } |
215 | } |
216 | spin_unlock(lock: &rio_global_list_lock); |
217 | device_unregister(dev: &rdev->dev); |
218 | } |
219 | EXPORT_SYMBOL_GPL(rio_del_device); |
220 | |
221 | /** |
222 | * rio_request_inb_mbox - request inbound mailbox service |
223 | * @mport: RIO master port from which to allocate the mailbox resource |
224 | * @dev_id: Device specific pointer to pass on event |
225 | * @mbox: Mailbox number to claim |
226 | * @entries: Number of entries in inbound mailbox queue |
227 | * @minb: Callback to execute when inbound message is received |
228 | * |
229 | * Requests ownership of an inbound mailbox resource and binds |
230 | * a callback function to the resource. Returns %0 on success. |
231 | */ |
232 | int rio_request_inb_mbox(struct rio_mport *mport, |
233 | void *dev_id, |
234 | int mbox, |
235 | int entries, |
236 | void (*minb) (struct rio_mport * mport, void *dev_id, int mbox, |
237 | int slot)) |
238 | { |
239 | int rc = -ENOSYS; |
240 | struct resource *res; |
241 | |
242 | if (!mport->ops->open_inb_mbox) |
243 | goto out; |
244 | |
245 | res = kzalloc(size: sizeof(*res), GFP_KERNEL); |
246 | if (res) { |
247 | rio_init_mbox_res(res, start: mbox, end: mbox); |
248 | |
249 | /* Make sure this mailbox isn't in use */ |
250 | rc = request_resource(root: &mport->riores[RIO_INB_MBOX_RESOURCE], |
251 | new: res); |
252 | if (rc < 0) { |
253 | kfree(objp: res); |
254 | goto out; |
255 | } |
256 | |
257 | mport->inb_msg[mbox].res = res; |
258 | |
259 | /* Hook the inbound message callback */ |
260 | mport->inb_msg[mbox].mcback = minb; |
261 | |
262 | rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries); |
263 | if (rc) { |
264 | mport->inb_msg[mbox].mcback = NULL; |
265 | mport->inb_msg[mbox].res = NULL; |
266 | release_resource(new: res); |
267 | kfree(objp: res); |
268 | } |
269 | } else |
270 | rc = -ENOMEM; |
271 | |
272 | out: |
273 | return rc; |
274 | } |
275 | EXPORT_SYMBOL_GPL(rio_request_inb_mbox); |
276 | |
277 | /** |
278 | * rio_release_inb_mbox - release inbound mailbox message service |
279 | * @mport: RIO master port from which to release the mailbox resource |
280 | * @mbox: Mailbox number to release |
281 | * |
282 | * Releases ownership of an inbound mailbox resource. Returns 0 |
283 | * if the request has been satisfied. |
284 | */ |
285 | int rio_release_inb_mbox(struct rio_mport *mport, int mbox) |
286 | { |
287 | int rc; |
288 | |
289 | if (!mport->ops->close_inb_mbox || !mport->inb_msg[mbox].res) |
290 | return -EINVAL; |
291 | |
292 | mport->ops->close_inb_mbox(mport, mbox); |
293 | mport->inb_msg[mbox].mcback = NULL; |
294 | |
295 | rc = release_resource(new: mport->inb_msg[mbox].res); |
296 | if (rc) |
297 | return rc; |
298 | |
299 | kfree(objp: mport->inb_msg[mbox].res); |
300 | mport->inb_msg[mbox].res = NULL; |
301 | |
302 | return 0; |
303 | } |
304 | EXPORT_SYMBOL_GPL(rio_release_inb_mbox); |
305 | |
306 | /** |
307 | * rio_request_outb_mbox - request outbound mailbox service |
308 | * @mport: RIO master port from which to allocate the mailbox resource |
309 | * @dev_id: Device specific pointer to pass on event |
310 | * @mbox: Mailbox number to claim |
311 | * @entries: Number of entries in outbound mailbox queue |
312 | * @moutb: Callback to execute when outbound message is sent |
313 | * |
314 | * Requests ownership of an outbound mailbox resource and binds |
315 | * a callback function to the resource. Returns 0 on success. |
316 | */ |
317 | int rio_request_outb_mbox(struct rio_mport *mport, |
318 | void *dev_id, |
319 | int mbox, |
320 | int entries, |
321 | void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot)) |
322 | { |
323 | int rc = -ENOSYS; |
324 | struct resource *res; |
325 | |
326 | if (!mport->ops->open_outb_mbox) |
327 | goto out; |
328 | |
329 | res = kzalloc(size: sizeof(*res), GFP_KERNEL); |
330 | if (res) { |
331 | rio_init_mbox_res(res, start: mbox, end: mbox); |
332 | |
333 | /* Make sure this outbound mailbox isn't in use */ |
334 | rc = request_resource(root: &mport->riores[RIO_OUTB_MBOX_RESOURCE], |
335 | new: res); |
336 | if (rc < 0) { |
337 | kfree(objp: res); |
338 | goto out; |
339 | } |
340 | |
341 | mport->outb_msg[mbox].res = res; |
342 | |
343 | /* Hook the inbound message callback */ |
344 | mport->outb_msg[mbox].mcback = moutb; |
345 | |
346 | rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries); |
347 | if (rc) { |
348 | mport->outb_msg[mbox].mcback = NULL; |
349 | mport->outb_msg[mbox].res = NULL; |
350 | release_resource(new: res); |
351 | kfree(objp: res); |
352 | } |
353 | } else |
354 | rc = -ENOMEM; |
355 | |
356 | out: |
357 | return rc; |
358 | } |
359 | EXPORT_SYMBOL_GPL(rio_request_outb_mbox); |
360 | |
361 | /** |
362 | * rio_release_outb_mbox - release outbound mailbox message service |
363 | * @mport: RIO master port from which to release the mailbox resource |
364 | * @mbox: Mailbox number to release |
365 | * |
366 | * Releases ownership of an inbound mailbox resource. Returns 0 |
367 | * if the request has been satisfied. |
368 | */ |
369 | int rio_release_outb_mbox(struct rio_mport *mport, int mbox) |
370 | { |
371 | int rc; |
372 | |
373 | if (!mport->ops->close_outb_mbox || !mport->outb_msg[mbox].res) |
374 | return -EINVAL; |
375 | |
376 | mport->ops->close_outb_mbox(mport, mbox); |
377 | mport->outb_msg[mbox].mcback = NULL; |
378 | |
379 | rc = release_resource(new: mport->outb_msg[mbox].res); |
380 | if (rc) |
381 | return rc; |
382 | |
383 | kfree(objp: mport->outb_msg[mbox].res); |
384 | mport->outb_msg[mbox].res = NULL; |
385 | |
386 | return 0; |
387 | } |
388 | EXPORT_SYMBOL_GPL(rio_release_outb_mbox); |
389 | |
390 | /** |
391 | * rio_setup_inb_dbell - bind inbound doorbell callback |
392 | * @mport: RIO master port to bind the doorbell callback |
393 | * @dev_id: Device specific pointer to pass on event |
394 | * @res: Doorbell message resource |
395 | * @dinb: Callback to execute when doorbell is received |
396 | * |
397 | * Adds a doorbell resource/callback pair into a port's |
398 | * doorbell event list. Returns 0 if the request has been |
399 | * satisfied. |
400 | */ |
401 | static int |
402 | rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res, |
403 | void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst, |
404 | u16 info)) |
405 | { |
406 | struct rio_dbell *dbell = kmalloc(size: sizeof(*dbell), GFP_KERNEL); |
407 | |
408 | if (!dbell) |
409 | return -ENOMEM; |
410 | |
411 | dbell->res = res; |
412 | dbell->dinb = dinb; |
413 | dbell->dev_id = dev_id; |
414 | |
415 | mutex_lock(&mport->lock); |
416 | list_add_tail(new: &dbell->node, head: &mport->dbells); |
417 | mutex_unlock(lock: &mport->lock); |
418 | return 0; |
419 | } |
420 | |
421 | /** |
422 | * rio_request_inb_dbell - request inbound doorbell message service |
423 | * @mport: RIO master port from which to allocate the doorbell resource |
424 | * @dev_id: Device specific pointer to pass on event |
425 | * @start: Doorbell info range start |
426 | * @end: Doorbell info range end |
427 | * @dinb: Callback to execute when doorbell is received |
428 | * |
429 | * Requests ownership of an inbound doorbell resource and binds |
430 | * a callback function to the resource. Returns 0 if the request |
431 | * has been satisfied. |
432 | */ |
433 | int rio_request_inb_dbell(struct rio_mport *mport, |
434 | void *dev_id, |
435 | u16 start, |
436 | u16 end, |
437 | void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, |
438 | u16 dst, u16 info)) |
439 | { |
440 | int rc; |
441 | struct resource *res = kzalloc(size: sizeof(*res), GFP_KERNEL); |
442 | |
443 | if (res) { |
444 | rio_init_dbell_res(res, start, end); |
445 | |
446 | /* Make sure these doorbells aren't in use */ |
447 | rc = request_resource(root: &mport->riores[RIO_DOORBELL_RESOURCE], |
448 | new: res); |
449 | if (rc < 0) { |
450 | kfree(objp: res); |
451 | goto out; |
452 | } |
453 | |
454 | /* Hook the doorbell callback */ |
455 | rc = rio_setup_inb_dbell(mport, dev_id, res, dinb); |
456 | } else |
457 | rc = -ENOMEM; |
458 | |
459 | out: |
460 | return rc; |
461 | } |
462 | EXPORT_SYMBOL_GPL(rio_request_inb_dbell); |
463 | |
464 | /** |
465 | * rio_release_inb_dbell - release inbound doorbell message service |
466 | * @mport: RIO master port from which to release the doorbell resource |
467 | * @start: Doorbell info range start |
468 | * @end: Doorbell info range end |
469 | * |
470 | * Releases ownership of an inbound doorbell resource and removes |
471 | * callback from the doorbell event list. Returns 0 if the request |
472 | * has been satisfied. |
473 | */ |
474 | int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end) |
475 | { |
476 | int rc = 0, found = 0; |
477 | struct rio_dbell *dbell; |
478 | |
479 | mutex_lock(&mport->lock); |
480 | list_for_each_entry(dbell, &mport->dbells, node) { |
481 | if ((dbell->res->start == start) && (dbell->res->end == end)) { |
482 | list_del(entry: &dbell->node); |
483 | found = 1; |
484 | break; |
485 | } |
486 | } |
487 | mutex_unlock(lock: &mport->lock); |
488 | |
489 | /* If we can't find an exact match, fail */ |
490 | if (!found) { |
491 | rc = -EINVAL; |
492 | goto out; |
493 | } |
494 | |
495 | /* Release the doorbell resource */ |
496 | rc = release_resource(new: dbell->res); |
497 | |
498 | /* Free the doorbell event */ |
499 | kfree(objp: dbell); |
500 | |
501 | out: |
502 | return rc; |
503 | } |
504 | EXPORT_SYMBOL_GPL(rio_release_inb_dbell); |
505 | |
506 | /** |
507 | * rio_request_outb_dbell - request outbound doorbell message range |
508 | * @rdev: RIO device from which to allocate the doorbell resource |
509 | * @start: Doorbell message range start |
510 | * @end: Doorbell message range end |
511 | * |
512 | * Requests ownership of a doorbell message range. Returns a resource |
513 | * if the request has been satisfied or %NULL on failure. |
514 | */ |
515 | struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start, |
516 | u16 end) |
517 | { |
518 | struct resource *res = kzalloc(size: sizeof(struct resource), GFP_KERNEL); |
519 | |
520 | if (res) { |
521 | rio_init_dbell_res(res, start, end); |
522 | |
523 | /* Make sure these doorbells aren't in use */ |
524 | if (request_resource(root: &rdev->riores[RIO_DOORBELL_RESOURCE], new: res) |
525 | < 0) { |
526 | kfree(objp: res); |
527 | res = NULL; |
528 | } |
529 | } |
530 | |
531 | return res; |
532 | } |
533 | EXPORT_SYMBOL_GPL(rio_request_outb_dbell); |
534 | |
535 | /** |
536 | * rio_release_outb_dbell - release outbound doorbell message range |
537 | * @rdev: RIO device from which to release the doorbell resource |
538 | * @res: Doorbell resource to be freed |
539 | * |
540 | * Releases ownership of a doorbell message range. Returns 0 if the |
541 | * request has been satisfied. |
542 | */ |
543 | int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res) |
544 | { |
545 | int rc = release_resource(new: res); |
546 | |
547 | kfree(objp: res); |
548 | |
549 | return rc; |
550 | } |
551 | EXPORT_SYMBOL_GPL(rio_release_outb_dbell); |
552 | |
553 | /** |
554 | * rio_add_mport_pw_handler - add port-write message handler into the list |
555 | * of mport specific pw handlers |
556 | * @mport: RIO master port to bind the portwrite callback |
557 | * @context: Handler specific context to pass on event |
558 | * @pwcback: Callback to execute when portwrite is received |
559 | * |
560 | * Returns 0 if the request has been satisfied. |
561 | */ |
562 | int rio_add_mport_pw_handler(struct rio_mport *mport, void *context, |
563 | int (*pwcback)(struct rio_mport *mport, |
564 | void *context, union rio_pw_msg *msg, int step)) |
565 | { |
566 | struct rio_pwrite *pwrite = kzalloc(size: sizeof(*pwrite), GFP_KERNEL); |
567 | |
568 | if (!pwrite) |
569 | return -ENOMEM; |
570 | |
571 | pwrite->pwcback = pwcback; |
572 | pwrite->context = context; |
573 | mutex_lock(&mport->lock); |
574 | list_add_tail(new: &pwrite->node, head: &mport->pwrites); |
575 | mutex_unlock(lock: &mport->lock); |
576 | return 0; |
577 | } |
578 | EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler); |
579 | |
580 | /** |
581 | * rio_del_mport_pw_handler - remove port-write message handler from the list |
582 | * of mport specific pw handlers |
583 | * @mport: RIO master port to bind the portwrite callback |
584 | * @context: Registered handler specific context to pass on event |
585 | * @pwcback: Registered callback function |
586 | * |
587 | * Returns 0 if the request has been satisfied. |
588 | */ |
589 | int rio_del_mport_pw_handler(struct rio_mport *mport, void *context, |
590 | int (*pwcback)(struct rio_mport *mport, |
591 | void *context, union rio_pw_msg *msg, int step)) |
592 | { |
593 | int rc = -EINVAL; |
594 | struct rio_pwrite *pwrite; |
595 | |
596 | mutex_lock(&mport->lock); |
597 | list_for_each_entry(pwrite, &mport->pwrites, node) { |
598 | if (pwrite->pwcback == pwcback && pwrite->context == context) { |
599 | list_del(entry: &pwrite->node); |
600 | kfree(objp: pwrite); |
601 | rc = 0; |
602 | break; |
603 | } |
604 | } |
605 | mutex_unlock(lock: &mport->lock); |
606 | |
607 | return rc; |
608 | } |
609 | EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler); |
610 | |
611 | /** |
612 | * rio_request_inb_pwrite - request inbound port-write message service for |
613 | * specific RapidIO device |
614 | * @rdev: RIO device to which register inbound port-write callback routine |
615 | * @pwcback: Callback routine to execute when port-write is received |
616 | * |
617 | * Binds a port-write callback function to the RapidIO device. |
618 | * Returns 0 if the request has been satisfied. |
619 | */ |
620 | int rio_request_inb_pwrite(struct rio_dev *rdev, |
621 | int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step)) |
622 | { |
623 | int rc = 0; |
624 | |
625 | spin_lock(lock: &rio_global_list_lock); |
626 | if (rdev->pwcback) |
627 | rc = -ENOMEM; |
628 | else |
629 | rdev->pwcback = pwcback; |
630 | |
631 | spin_unlock(lock: &rio_global_list_lock); |
632 | return rc; |
633 | } |
634 | EXPORT_SYMBOL_GPL(rio_request_inb_pwrite); |
635 | |
636 | /** |
637 | * rio_release_inb_pwrite - release inbound port-write message service |
638 | * associated with specific RapidIO device |
639 | * @rdev: RIO device which registered for inbound port-write callback |
640 | * |
641 | * Removes callback from the rio_dev structure. Returns 0 if the request |
642 | * has been satisfied. |
643 | */ |
644 | int rio_release_inb_pwrite(struct rio_dev *rdev) |
645 | { |
646 | int rc = -ENOMEM; |
647 | |
648 | spin_lock(lock: &rio_global_list_lock); |
649 | if (rdev->pwcback) { |
650 | rdev->pwcback = NULL; |
651 | rc = 0; |
652 | } |
653 | |
654 | spin_unlock(lock: &rio_global_list_lock); |
655 | return rc; |
656 | } |
657 | EXPORT_SYMBOL_GPL(rio_release_inb_pwrite); |
658 | |
659 | /** |
660 | * rio_pw_enable - Enables/disables port-write handling by a master port |
661 | * @mport: Master port associated with port-write handling |
662 | * @enable: 1=enable, 0=disable |
663 | */ |
664 | void rio_pw_enable(struct rio_mport *mport, int enable) |
665 | { |
666 | if (mport->ops->pwenable) { |
667 | mutex_lock(&mport->lock); |
668 | |
669 | if ((enable && ++mport->pwe_refcnt == 1) || |
670 | (!enable && mport->pwe_refcnt && --mport->pwe_refcnt == 0)) |
671 | mport->ops->pwenable(mport, enable); |
672 | mutex_unlock(lock: &mport->lock); |
673 | } |
674 | } |
675 | EXPORT_SYMBOL_GPL(rio_pw_enable); |
676 | |
677 | /** |
678 | * rio_map_inb_region -- Map inbound memory region. |
679 | * @mport: Master port. |
680 | * @local: physical address of memory region to be mapped |
681 | * @rbase: RIO base address assigned to this window |
682 | * @size: Size of the memory region |
683 | * @rflags: Flags for mapping. |
684 | * |
685 | * Return: 0 -- Success. |
686 | * |
687 | * This function will create the mapping from RIO space to local memory. |
688 | */ |
689 | int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local, |
690 | u64 rbase, u32 size, u32 rflags) |
691 | { |
692 | int rc; |
693 | unsigned long flags; |
694 | |
695 | if (!mport->ops->map_inb) |
696 | return -1; |
697 | spin_lock_irqsave(&rio_mmap_lock, flags); |
698 | rc = mport->ops->map_inb(mport, local, rbase, size, rflags); |
699 | spin_unlock_irqrestore(lock: &rio_mmap_lock, flags); |
700 | return rc; |
701 | } |
702 | EXPORT_SYMBOL_GPL(rio_map_inb_region); |
703 | |
704 | /** |
705 | * rio_unmap_inb_region -- Unmap the inbound memory region |
706 | * @mport: Master port |
707 | * @lstart: physical address of memory region to be unmapped |
708 | */ |
709 | void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart) |
710 | { |
711 | unsigned long flags; |
712 | if (!mport->ops->unmap_inb) |
713 | return; |
714 | spin_lock_irqsave(&rio_mmap_lock, flags); |
715 | mport->ops->unmap_inb(mport, lstart); |
716 | spin_unlock_irqrestore(lock: &rio_mmap_lock, flags); |
717 | } |
718 | EXPORT_SYMBOL_GPL(rio_unmap_inb_region); |
719 | |
720 | /** |
721 | * rio_map_outb_region -- Map outbound memory region. |
722 | * @mport: Master port. |
723 | * @destid: destination id window points to |
724 | * @rbase: RIO base address window translates to |
725 | * @size: Size of the memory region |
726 | * @rflags: Flags for mapping. |
727 | * @local: physical address of memory region mapped |
728 | * |
729 | * Return: 0 -- Success. |
730 | * |
731 | * This function will create the mapping from RIO space to local memory. |
732 | */ |
733 | int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase, |
734 | u32 size, u32 rflags, dma_addr_t *local) |
735 | { |
736 | int rc; |
737 | unsigned long flags; |
738 | |
739 | if (!mport->ops->map_outb) |
740 | return -ENODEV; |
741 | |
742 | spin_lock_irqsave(&rio_mmap_lock, flags); |
743 | rc = mport->ops->map_outb(mport, destid, rbase, size, |
744 | rflags, local); |
745 | spin_unlock_irqrestore(lock: &rio_mmap_lock, flags); |
746 | |
747 | return rc; |
748 | } |
749 | EXPORT_SYMBOL_GPL(rio_map_outb_region); |
750 | |
751 | /** |
752 | * rio_unmap_outb_region -- Unmap the inbound memory region |
753 | * @mport: Master port |
754 | * @destid: destination id mapping points to |
755 | * @rstart: RIO base address window translates to |
756 | */ |
757 | void rio_unmap_outb_region(struct rio_mport *mport, u16 destid, u64 rstart) |
758 | { |
759 | unsigned long flags; |
760 | |
761 | if (!mport->ops->unmap_outb) |
762 | return; |
763 | |
764 | spin_lock_irqsave(&rio_mmap_lock, flags); |
765 | mport->ops->unmap_outb(mport, destid, rstart); |
766 | spin_unlock_irqrestore(lock: &rio_mmap_lock, flags); |
767 | } |
768 | EXPORT_SYMBOL_GPL(rio_unmap_outb_region); |
769 | |
770 | /** |
771 | * rio_mport_get_physefb - Helper function that returns register offset |
772 | * for Physical Layer Extended Features Block. |
773 | * @port: Master port to issue transaction |
774 | * @local: Indicate a local master port or remote device access |
775 | * @destid: Destination ID of the device |
776 | * @hopcount: Number of switch hops to the device |
777 | * @rmap: pointer to location to store register map type info |
778 | */ |
779 | u32 |
780 | rio_mport_get_physefb(struct rio_mport *port, int local, |
781 | u16 destid, u8 hopcount, u32 *rmap) |
782 | { |
783 | u32 ext_ftr_ptr; |
784 | u32 ; |
785 | |
786 | ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, from: 0); |
787 | |
788 | while (ext_ftr_ptr) { |
789 | if (local) |
790 | rio_local_read_config_32(port, offset: ext_ftr_ptr, |
791 | data: &ftr_header); |
792 | else |
793 | rio_mport_read_config_32(port, destid, hopcount, |
794 | offset: ext_ftr_ptr, data: &ftr_header); |
795 | |
796 | ftr_header = RIO_GET_BLOCK_ID(ftr_header); |
797 | switch (ftr_header) { |
798 | |
799 | case RIO_EFB_SER_EP_ID: |
800 | case RIO_EFB_SER_EP_REC_ID: |
801 | case RIO_EFB_SER_EP_FREE_ID: |
802 | case RIO_EFB_SER_EP_M1_ID: |
803 | case RIO_EFB_SER_EP_SW_M1_ID: |
804 | case RIO_EFB_SER_EPF_M1_ID: |
805 | case RIO_EFB_SER_EPF_SW_M1_ID: |
806 | *rmap = 1; |
807 | return ext_ftr_ptr; |
808 | |
809 | case RIO_EFB_SER_EP_M2_ID: |
810 | case RIO_EFB_SER_EP_SW_M2_ID: |
811 | case RIO_EFB_SER_EPF_M2_ID: |
812 | case RIO_EFB_SER_EPF_SW_M2_ID: |
813 | *rmap = 2; |
814 | return ext_ftr_ptr; |
815 | |
816 | default: |
817 | break; |
818 | } |
819 | |
820 | ext_ftr_ptr = rio_mport_get_efb(port, local, destid, |
821 | hopcount, from: ext_ftr_ptr); |
822 | } |
823 | |
824 | return ext_ftr_ptr; |
825 | } |
826 | EXPORT_SYMBOL_GPL(rio_mport_get_physefb); |
827 | |
828 | /** |
829 | * rio_get_comptag - Begin or continue searching for a RIO device by component tag |
830 | * @comp_tag: RIO component tag to match |
831 | * @from: Previous RIO device found in search, or %NULL for new search |
832 | * |
833 | * Iterates through the list of known RIO devices. If a RIO device is |
834 | * found with a matching @comp_tag, a pointer to its device |
835 | * structure is returned. Otherwise, %NULL is returned. A new search |
836 | * is initiated by passing %NULL to the @from argument. Otherwise, if |
837 | * @from is not %NULL, searches continue from next device on the global |
838 | * list. |
839 | */ |
840 | struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from) |
841 | { |
842 | struct list_head *n; |
843 | struct rio_dev *rdev; |
844 | |
845 | spin_lock(lock: &rio_global_list_lock); |
846 | n = from ? from->global_list.next : rio_devices.next; |
847 | |
848 | while (n && (n != &rio_devices)) { |
849 | rdev = rio_dev_g(n); |
850 | if (rdev->comp_tag == comp_tag) |
851 | goto exit; |
852 | n = n->next; |
853 | } |
854 | rdev = NULL; |
855 | exit: |
856 | spin_unlock(lock: &rio_global_list_lock); |
857 | return rdev; |
858 | } |
859 | EXPORT_SYMBOL_GPL(rio_get_comptag); |
860 | |
861 | /** |
862 | * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port. |
863 | * @rdev: Pointer to RIO device control structure |
864 | * @pnum: Switch port number to set LOCKOUT bit |
865 | * @lock: Operation : set (=1) or clear (=0) |
866 | */ |
867 | int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock) |
868 | { |
869 | u32 regval; |
870 | |
871 | rio_read_config_32(rdev, |
872 | RIO_DEV_PORT_N_CTL_CSR(rdev, pnum), |
873 | data: ®val); |
874 | if (lock) |
875 | regval |= RIO_PORT_N_CTL_LOCKOUT; |
876 | else |
877 | regval &= ~RIO_PORT_N_CTL_LOCKOUT; |
878 | |
879 | rio_write_config_32(rdev, |
880 | RIO_DEV_PORT_N_CTL_CSR(rdev, pnum), |
881 | data: regval); |
882 | return 0; |
883 | } |
884 | EXPORT_SYMBOL_GPL(rio_set_port_lockout); |
885 | |
886 | /** |
887 | * rio_enable_rx_tx_port - enable input receiver and output transmitter of |
888 | * given port |
889 | * @port: Master port associated with the RIO network |
890 | * @local: local=1 select local port otherwise a far device is reached |
891 | * @destid: Destination ID of the device to check host bit |
892 | * @hopcount: Number of hops to reach the target |
893 | * @port_num: Port (-number on switch) to enable on a far end device |
894 | * |
895 | * Returns 0 or 1 from on General Control Command and Status Register |
896 | * (EXT_PTR+0x3C) |
897 | */ |
898 | int rio_enable_rx_tx_port(struct rio_mport *port, |
899 | int local, u16 destid, |
900 | u8 hopcount, u8 port_num) |
901 | { |
902 | #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS |
903 | u32 regval; |
904 | u32 ext_ftr_ptr; |
905 | u32 rmap; |
906 | |
907 | /* |
908 | * enable rx input tx output port |
909 | */ |
910 | pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = " |
911 | "%d, port_num = %d)\n" , local, destid, hopcount, port_num); |
912 | |
913 | ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, |
914 | hopcount, &rmap); |
915 | |
916 | if (local) { |
917 | rio_local_read_config_32(port, |
918 | offset: ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap), |
919 | data: ®val); |
920 | } else { |
921 | if (rio_mport_read_config_32(port, destid, hopcount, |
922 | offset: ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap), |
923 | data: ®val) < 0) |
924 | return -EIO; |
925 | } |
926 | |
927 | regval = regval | RIO_PORT_N_CTL_EN_RX | RIO_PORT_N_CTL_EN_TX; |
928 | |
929 | if (local) { |
930 | rio_local_write_config_32(port, |
931 | offset: ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap), data: regval); |
932 | } else { |
933 | if (rio_mport_write_config_32(port, destid, hopcount, |
934 | offset: ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap), |
935 | data: regval) < 0) |
936 | return -EIO; |
937 | } |
938 | #endif |
939 | return 0; |
940 | } |
941 | EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port); |
942 | |
943 | |
944 | /** |
945 | * rio_chk_dev_route - Validate route to the specified device. |
946 | * @rdev: RIO device failed to respond |
947 | * @nrdev: Last active device on the route to rdev |
948 | * @npnum: nrdev's port number on the route to rdev |
949 | * |
950 | * Follows a route to the specified RIO device to determine the last available |
951 | * device (and corresponding RIO port) on the route. |
952 | */ |
953 | static int |
954 | rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum) |
955 | { |
956 | u32 result; |
957 | int p_port, rc = -EIO; |
958 | struct rio_dev *prev = NULL; |
959 | |
960 | /* Find switch with failed RIO link */ |
961 | while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) { |
962 | if (!rio_read_config_32(rdev: rdev->prev, RIO_DEV_ID_CAR, data: &result)) { |
963 | prev = rdev->prev; |
964 | break; |
965 | } |
966 | rdev = rdev->prev; |
967 | } |
968 | |
969 | if (!prev) |
970 | goto err_out; |
971 | |
972 | p_port = prev->rswitch->route_table[rdev->destid]; |
973 | |
974 | if (p_port != RIO_INVALID_ROUTE) { |
975 | pr_debug("RIO: link failed on [%s]-P%d\n" , |
976 | rio_name(prev), p_port); |
977 | *nrdev = prev; |
978 | *npnum = p_port; |
979 | rc = 0; |
980 | } else |
981 | pr_debug("RIO: failed to trace route to %s\n" , rio_name(rdev)); |
982 | err_out: |
983 | return rc; |
984 | } |
985 | |
986 | /** |
987 | * rio_mport_chk_dev_access - Validate access to the specified device. |
988 | * @mport: Master port to send transactions |
989 | * @destid: Device destination ID in network |
990 | * @hopcount: Number of hops into the network |
991 | */ |
992 | int |
993 | rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount) |
994 | { |
995 | int i = 0; |
996 | u32 tmp; |
997 | |
998 | while (rio_mport_read_config_32(port: mport, destid, hopcount, |
999 | RIO_DEV_ID_CAR, data: &tmp)) { |
1000 | i++; |
1001 | if (i == RIO_MAX_CHK_RETRY) |
1002 | return -EIO; |
1003 | mdelay(1); |
1004 | } |
1005 | |
1006 | return 0; |
1007 | } |
1008 | EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access); |
1009 | |
1010 | /** |
1011 | * rio_chk_dev_access - Validate access to the specified device. |
1012 | * @rdev: Pointer to RIO device control structure |
1013 | */ |
1014 | static int rio_chk_dev_access(struct rio_dev *rdev) |
1015 | { |
1016 | return rio_mport_chk_dev_access(rdev->net->hport, |
1017 | rdev->destid, rdev->hopcount); |
1018 | } |
1019 | |
1020 | /** |
1021 | * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and |
1022 | * returns link-response (if requested). |
1023 | * @rdev: RIO devive to issue Input-status command |
1024 | * @pnum: Device port number to issue the command |
1025 | * @lnkresp: Response from a link partner |
1026 | */ |
1027 | static int |
1028 | rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp) |
1029 | { |
1030 | u32 regval; |
1031 | int checkcount; |
1032 | |
1033 | if (lnkresp) { |
1034 | /* Read from link maintenance response register |
1035 | * to clear valid bit */ |
1036 | rio_read_config_32(rdev, |
1037 | RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum), |
1038 | data: ®val); |
1039 | udelay(50); |
1040 | } |
1041 | |
1042 | /* Issue Input-status command */ |
1043 | rio_write_config_32(rdev, |
1044 | RIO_DEV_PORT_N_MNT_REQ_CSR(rdev, pnum), |
1045 | RIO_MNT_REQ_CMD_IS); |
1046 | |
1047 | /* Exit if the response is not expected */ |
1048 | if (!lnkresp) |
1049 | return 0; |
1050 | |
1051 | checkcount = 3; |
1052 | while (checkcount--) { |
1053 | udelay(50); |
1054 | rio_read_config_32(rdev, |
1055 | RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum), |
1056 | data: ®val); |
1057 | if (regval & RIO_PORT_N_MNT_RSP_RVAL) { |
1058 | *lnkresp = regval; |
1059 | return 0; |
1060 | } |
1061 | } |
1062 | |
1063 | return -EIO; |
1064 | } |
1065 | |
1066 | /** |
1067 | * rio_clr_err_stopped - Clears port Error-stopped states. |
1068 | * @rdev: Pointer to RIO device control structure |
1069 | * @pnum: Switch port number to clear errors |
1070 | * @err_status: port error status (if 0 reads register from device) |
1071 | * |
1072 | * TODO: Currently this routine is not compatible with recovery process |
1073 | * specified for idt_gen3 RapidIO switch devices. It has to be reviewed |
1074 | * to implement universal recovery process that is compatible full range |
1075 | * off available devices. |
1076 | * IDT gen3 switch driver now implements HW-specific error handler that |
1077 | * issues soft port reset to the port to reset ERR_STOP bits and ackIDs. |
1078 | */ |
1079 | static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status) |
1080 | { |
1081 | struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum]; |
1082 | u32 regval; |
1083 | u32 far_ackid, far_linkstat, near_ackid; |
1084 | |
1085 | if (err_status == 0) |
1086 | rio_read_config_32(rdev, |
1087 | RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum), |
1088 | data: &err_status); |
1089 | |
1090 | if (err_status & RIO_PORT_N_ERR_STS_OUT_ES) { |
1091 | pr_debug("RIO_EM: servicing Output Error-Stopped state\n" ); |
1092 | /* |
1093 | * Send a Link-Request/Input-Status control symbol |
1094 | */ |
1095 | if (rio_get_input_status(rdev, pnum, lnkresp: ®val)) { |
1096 | pr_debug("RIO_EM: Input-status response timeout\n" ); |
1097 | goto rd_err; |
1098 | } |
1099 | |
1100 | pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n" , |
1101 | pnum, regval); |
1102 | far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5; |
1103 | far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT; |
1104 | rio_read_config_32(rdev, |
1105 | RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum), |
1106 | data: ®val); |
1107 | pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n" , pnum, regval); |
1108 | near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24; |
1109 | pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \ |
1110 | " near_ackID=0x%02x\n" , |
1111 | pnum, far_ackid, far_linkstat, near_ackid); |
1112 | |
1113 | /* |
1114 | * If required, synchronize ackIDs of near and |
1115 | * far sides. |
1116 | */ |
1117 | if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) || |
1118 | (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) { |
1119 | /* Align near outstanding/outbound ackIDs with |
1120 | * far inbound. |
1121 | */ |
1122 | rio_write_config_32(rdev, |
1123 | RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum), |
1124 | data: (near_ackid << 24) | |
1125 | (far_ackid << 8) | far_ackid); |
1126 | /* Align far outstanding/outbound ackIDs with |
1127 | * near inbound. |
1128 | */ |
1129 | far_ackid++; |
1130 | if (!nextdev) { |
1131 | pr_debug("RIO_EM: nextdev pointer == NULL\n" ); |
1132 | goto rd_err; |
1133 | } |
1134 | |
1135 | rio_write_config_32(rdev: nextdev, |
1136 | RIO_DEV_PORT_N_ACK_STS_CSR(nextdev, |
1137 | RIO_GET_PORT_NUM(nextdev->swpinfo)), |
1138 | data: (far_ackid << 24) | |
1139 | (near_ackid << 8) | near_ackid); |
1140 | } |
1141 | rd_err: |
1142 | rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum), |
1143 | data: &err_status); |
1144 | pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n" , pnum, err_status); |
1145 | } |
1146 | |
1147 | if ((err_status & RIO_PORT_N_ERR_STS_INP_ES) && nextdev) { |
1148 | pr_debug("RIO_EM: servicing Input Error-Stopped state\n" ); |
1149 | rio_get_input_status(rdev: nextdev, |
1150 | RIO_GET_PORT_NUM(nextdev->swpinfo), NULL); |
1151 | udelay(50); |
1152 | |
1153 | rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum), |
1154 | data: &err_status); |
1155 | pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n" , pnum, err_status); |
1156 | } |
1157 | |
1158 | return (err_status & (RIO_PORT_N_ERR_STS_OUT_ES | |
1159 | RIO_PORT_N_ERR_STS_INP_ES)) ? 1 : 0; |
1160 | } |
1161 | |
1162 | /** |
1163 | * rio_inb_pwrite_handler - inbound port-write message handler |
1164 | * @mport: mport device associated with port-write |
1165 | * @pw_msg: pointer to inbound port-write message |
1166 | * |
1167 | * Processes an inbound port-write message. Returns 0 if the request |
1168 | * has been satisfied. |
1169 | */ |
1170 | int rio_inb_pwrite_handler(struct rio_mport *mport, union rio_pw_msg *pw_msg) |
1171 | { |
1172 | struct rio_dev *rdev; |
1173 | u32 err_status, em_perrdet, em_ltlerrdet; |
1174 | int rc, portnum; |
1175 | struct rio_pwrite *pwrite; |
1176 | |
1177 | #ifdef DEBUG_PW |
1178 | { |
1179 | u32 i; |
1180 | |
1181 | pr_debug("%s: PW to mport_%d:\n" , __func__, mport->id); |
1182 | for (i = 0; i < RIO_PW_MSG_SIZE / sizeof(u32); i = i + 4) { |
1183 | pr_debug("0x%02x: %08x %08x %08x %08x\n" , |
1184 | i * 4, pw_msg->raw[i], pw_msg->raw[i + 1], |
1185 | pw_msg->raw[i + 2], pw_msg->raw[i + 3]); |
1186 | } |
1187 | } |
1188 | #endif |
1189 | |
1190 | rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL); |
1191 | if (rdev) { |
1192 | pr_debug("RIO: Port-Write message from %s\n" , rio_name(rdev)); |
1193 | } else { |
1194 | pr_debug("RIO: %s No matching device for CTag 0x%08x\n" , |
1195 | __func__, pw_msg->em.comptag); |
1196 | } |
1197 | |
1198 | /* Call a device-specific handler (if it is registered for the device). |
1199 | * This may be the service for endpoints that send device-specific |
1200 | * port-write messages. End-point messages expected to be handled |
1201 | * completely by EP specific device driver. |
1202 | * For switches rc==0 signals that no standard processing required. |
1203 | */ |
1204 | if (rdev && rdev->pwcback) { |
1205 | rc = rdev->pwcback(rdev, pw_msg, 0); |
1206 | if (rc == 0) |
1207 | return 0; |
1208 | } |
1209 | |
1210 | mutex_lock(&mport->lock); |
1211 | list_for_each_entry(pwrite, &mport->pwrites, node) |
1212 | pwrite->pwcback(mport, pwrite->context, pw_msg, 0); |
1213 | mutex_unlock(lock: &mport->lock); |
1214 | |
1215 | if (!rdev) |
1216 | return 0; |
1217 | |
1218 | /* |
1219 | * FIXME: The code below stays as it was before for now until we decide |
1220 | * how to do default PW handling in combination with per-mport callbacks |
1221 | */ |
1222 | |
1223 | portnum = pw_msg->em.is_port & 0xFF; |
1224 | |
1225 | /* Check if device and route to it are functional: |
1226 | * Sometimes devices may send PW message(s) just before being |
1227 | * powered down (or link being lost). |
1228 | */ |
1229 | if (rio_chk_dev_access(rdev)) { |
1230 | pr_debug("RIO: device access failed - get link partner\n" ); |
1231 | /* Scan route to the device and identify failed link. |
1232 | * This will replace device and port reported in PW message. |
1233 | * PW message should not be used after this point. |
1234 | */ |
1235 | if (rio_chk_dev_route(rdev, nrdev: &rdev, npnum: &portnum)) { |
1236 | pr_err("RIO: Route trace for %s failed\n" , |
1237 | rio_name(rdev)); |
1238 | return -EIO; |
1239 | } |
1240 | pw_msg = NULL; |
1241 | } |
1242 | |
1243 | /* For End-point devices processing stops here */ |
1244 | if (!(rdev->pef & RIO_PEF_SWITCH)) |
1245 | return 0; |
1246 | |
1247 | if (rdev->phys_efptr == 0) { |
1248 | pr_err("RIO_PW: Bad switch initialization for %s\n" , |
1249 | rio_name(rdev)); |
1250 | return 0; |
1251 | } |
1252 | |
1253 | /* |
1254 | * Process the port-write notification from switch |
1255 | */ |
1256 | if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle) |
1257 | rdev->rswitch->ops->em_handle(rdev, portnum); |
1258 | |
1259 | rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum), |
1260 | data: &err_status); |
1261 | pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n" , portnum, err_status); |
1262 | |
1263 | if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) { |
1264 | |
1265 | if (!(rdev->rswitch->port_ok & (1 << portnum))) { |
1266 | rdev->rswitch->port_ok |= (1 << portnum); |
1267 | rio_set_port_lockout(rdev, portnum, 0); |
1268 | /* Schedule Insertion Service */ |
1269 | pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n" , |
1270 | rio_name(rdev), portnum); |
1271 | } |
1272 | |
1273 | /* Clear error-stopped states (if reported). |
1274 | * Depending on the link partner state, two attempts |
1275 | * may be needed for successful recovery. |
1276 | */ |
1277 | if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES | |
1278 | RIO_PORT_N_ERR_STS_INP_ES)) { |
1279 | if (rio_clr_err_stopped(rdev, pnum: portnum, err_status)) |
1280 | rio_clr_err_stopped(rdev, pnum: portnum, err_status: 0); |
1281 | } |
1282 | } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */ |
1283 | |
1284 | if (rdev->rswitch->port_ok & (1 << portnum)) { |
1285 | rdev->rswitch->port_ok &= ~(1 << portnum); |
1286 | rio_set_port_lockout(rdev, portnum, 1); |
1287 | |
1288 | if (rdev->phys_rmap == 1) { |
1289 | rio_write_config_32(rdev, |
1290 | RIO_DEV_PORT_N_ACK_STS_CSR(rdev, portnum), |
1291 | RIO_PORT_N_ACK_CLEAR); |
1292 | } else { |
1293 | rio_write_config_32(rdev, |
1294 | RIO_DEV_PORT_N_OB_ACK_CSR(rdev, portnum), |
1295 | RIO_PORT_N_OB_ACK_CLEAR); |
1296 | rio_write_config_32(rdev, |
1297 | RIO_DEV_PORT_N_IB_ACK_CSR(rdev, portnum), |
1298 | data: 0); |
1299 | } |
1300 | |
1301 | /* Schedule Extraction Service */ |
1302 | pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n" , |
1303 | rio_name(rdev), portnum); |
1304 | } |
1305 | } |
1306 | |
1307 | rio_read_config_32(rdev, |
1308 | offset: rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), data: &em_perrdet); |
1309 | if (em_perrdet) { |
1310 | pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n" , |
1311 | portnum, em_perrdet); |
1312 | /* Clear EM Port N Error Detect CSR */ |
1313 | rio_write_config_32(rdev, |
1314 | offset: rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), data: 0); |
1315 | } |
1316 | |
1317 | rio_read_config_32(rdev, |
1318 | offset: rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, data: &em_ltlerrdet); |
1319 | if (em_ltlerrdet) { |
1320 | pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n" , |
1321 | em_ltlerrdet); |
1322 | /* Clear EM L/T Layer Error Detect CSR */ |
1323 | rio_write_config_32(rdev, |
1324 | offset: rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, data: 0); |
1325 | } |
1326 | |
1327 | /* Clear remaining error bits and Port-Write Pending bit */ |
1328 | rio_write_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum), |
1329 | data: err_status); |
1330 | |
1331 | return 0; |
1332 | } |
1333 | EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler); |
1334 | |
1335 | /** |
1336 | * rio_mport_get_efb - get pointer to next extended features block |
1337 | * @port: Master port to issue transaction |
1338 | * @local: Indicate a local master port or remote device access |
1339 | * @destid: Destination ID of the device |
1340 | * @hopcount: Number of switch hops to the device |
1341 | * @from: Offset of current Extended Feature block header (if 0 starts |
1342 | * from ExtFeaturePtr) |
1343 | */ |
1344 | u32 |
1345 | rio_mport_get_efb(struct rio_mport *port, int local, u16 destid, |
1346 | u8 hopcount, u32 from) |
1347 | { |
1348 | u32 reg_val; |
1349 | |
1350 | if (from == 0) { |
1351 | if (local) |
1352 | rio_local_read_config_32(port, RIO_ASM_INFO_CAR, |
1353 | data: ®_val); |
1354 | else |
1355 | rio_mport_read_config_32(port, destid, hopcount, |
1356 | RIO_ASM_INFO_CAR, data: ®_val); |
1357 | return reg_val & RIO_EXT_FTR_PTR_MASK; |
1358 | } else { |
1359 | if (local) |
1360 | rio_local_read_config_32(port, offset: from, data: ®_val); |
1361 | else |
1362 | rio_mport_read_config_32(port, destid, hopcount, |
1363 | offset: from, data: ®_val); |
1364 | return RIO_GET_BLOCK_ID(reg_val); |
1365 | } |
1366 | } |
1367 | EXPORT_SYMBOL_GPL(rio_mport_get_efb); |
1368 | |
1369 | /** |
1370 | * rio_mport_get_feature - query for devices' extended features |
1371 | * @port: Master port to issue transaction |
1372 | * @local: Indicate a local master port or remote device access |
1373 | * @destid: Destination ID of the device |
1374 | * @hopcount: Number of switch hops to the device |
1375 | * @ftr: Extended feature code |
1376 | * |
1377 | * Tell if a device supports a given RapidIO capability. |
1378 | * Returns the offset of the requested extended feature |
1379 | * block within the device's RIO configuration space or |
1380 | * 0 in case the device does not support it. |
1381 | */ |
1382 | u32 |
1383 | rio_mport_get_feature(struct rio_mport * port, int local, u16 destid, |
1384 | u8 hopcount, int ftr) |
1385 | { |
1386 | u32 asm_info, ext_ftr_ptr, ; |
1387 | |
1388 | if (local) |
1389 | rio_local_read_config_32(port, RIO_ASM_INFO_CAR, data: &asm_info); |
1390 | else |
1391 | rio_mport_read_config_32(port, destid, hopcount, |
1392 | RIO_ASM_INFO_CAR, data: &asm_info); |
1393 | |
1394 | ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK; |
1395 | |
1396 | while (ext_ftr_ptr) { |
1397 | if (local) |
1398 | rio_local_read_config_32(port, offset: ext_ftr_ptr, |
1399 | data: &ftr_header); |
1400 | else |
1401 | rio_mport_read_config_32(port, destid, hopcount, |
1402 | offset: ext_ftr_ptr, data: &ftr_header); |
1403 | if (RIO_GET_BLOCK_ID(ftr_header) == ftr) |
1404 | return ext_ftr_ptr; |
1405 | |
1406 | ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header); |
1407 | if (!ext_ftr_ptr) |
1408 | break; |
1409 | } |
1410 | |
1411 | return 0; |
1412 | } |
1413 | EXPORT_SYMBOL_GPL(rio_mport_get_feature); |
1414 | |
1415 | /** |
1416 | * rio_std_route_add_entry - Add switch route table entry using standard |
1417 | * registers defined in RIO specification rev.1.3 |
1418 | * @mport: Master port to issue transaction |
1419 | * @destid: Destination ID of the device |
1420 | * @hopcount: Number of switch hops to the device |
1421 | * @table: routing table ID (global or port-specific) |
1422 | * @route_destid: destID entry in the RT |
1423 | * @route_port: destination port for specified destID |
1424 | */ |
1425 | static int |
1426 | rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount, |
1427 | u16 table, u16 route_destid, u8 route_port) |
1428 | { |
1429 | if (table == RIO_GLOBAL_TABLE) { |
1430 | rio_mport_write_config_32(port: mport, destid, hopcount, |
1431 | RIO_STD_RTE_CONF_DESTID_SEL_CSR, |
1432 | data: (u32)route_destid); |
1433 | rio_mport_write_config_32(port: mport, destid, hopcount, |
1434 | RIO_STD_RTE_CONF_PORT_SEL_CSR, |
1435 | data: (u32)route_port); |
1436 | } |
1437 | |
1438 | udelay(10); |
1439 | return 0; |
1440 | } |
1441 | |
1442 | /** |
1443 | * rio_std_route_get_entry - Read switch route table entry (port number) |
1444 | * associated with specified destID using standard registers defined in RIO |
1445 | * specification rev.1.3 |
1446 | * @mport: Master port to issue transaction |
1447 | * @destid: Destination ID of the device |
1448 | * @hopcount: Number of switch hops to the device |
1449 | * @table: routing table ID (global or port-specific) |
1450 | * @route_destid: destID entry in the RT |
1451 | * @route_port: returned destination port for specified destID |
1452 | */ |
1453 | static int |
1454 | rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount, |
1455 | u16 table, u16 route_destid, u8 *route_port) |
1456 | { |
1457 | u32 result; |
1458 | |
1459 | if (table == RIO_GLOBAL_TABLE) { |
1460 | rio_mport_write_config_32(port: mport, destid, hopcount, |
1461 | RIO_STD_RTE_CONF_DESTID_SEL_CSR, data: route_destid); |
1462 | rio_mport_read_config_32(port: mport, destid, hopcount, |
1463 | RIO_STD_RTE_CONF_PORT_SEL_CSR, data: &result); |
1464 | |
1465 | *route_port = (u8)result; |
1466 | } |
1467 | |
1468 | return 0; |
1469 | } |
1470 | |
1471 | /** |
1472 | * rio_std_route_clr_table - Clear swotch route table using standard registers |
1473 | * defined in RIO specification rev.1.3. |
1474 | * @mport: Master port to issue transaction |
1475 | * @destid: Destination ID of the device |
1476 | * @hopcount: Number of switch hops to the device |
1477 | * @table: routing table ID (global or port-specific) |
1478 | */ |
1479 | static int |
1480 | rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount, |
1481 | u16 table) |
1482 | { |
1483 | u32 max_destid = 0xff; |
1484 | u32 i, pef, id_inc = 1, ext_cfg = 0; |
1485 | u32 port_sel = RIO_INVALID_ROUTE; |
1486 | |
1487 | if (table == RIO_GLOBAL_TABLE) { |
1488 | rio_mport_read_config_32(port: mport, destid, hopcount, |
1489 | RIO_PEF_CAR, data: &pef); |
1490 | |
1491 | if (mport->sys_size) { |
1492 | rio_mport_read_config_32(port: mport, destid, hopcount, |
1493 | RIO_SWITCH_RT_LIMIT, |
1494 | data: &max_destid); |
1495 | max_destid &= RIO_RT_MAX_DESTID; |
1496 | } |
1497 | |
1498 | if (pef & RIO_PEF_EXT_RT) { |
1499 | ext_cfg = 0x80000000; |
1500 | id_inc = 4; |
1501 | port_sel = (RIO_INVALID_ROUTE << 24) | |
1502 | (RIO_INVALID_ROUTE << 16) | |
1503 | (RIO_INVALID_ROUTE << 8) | |
1504 | RIO_INVALID_ROUTE; |
1505 | } |
1506 | |
1507 | for (i = 0; i <= max_destid;) { |
1508 | rio_mport_write_config_32(port: mport, destid, hopcount, |
1509 | RIO_STD_RTE_CONF_DESTID_SEL_CSR, |
1510 | data: ext_cfg | i); |
1511 | rio_mport_write_config_32(port: mport, destid, hopcount, |
1512 | RIO_STD_RTE_CONF_PORT_SEL_CSR, |
1513 | data: port_sel); |
1514 | i += id_inc; |
1515 | } |
1516 | } |
1517 | |
1518 | udelay(10); |
1519 | return 0; |
1520 | } |
1521 | |
1522 | /** |
1523 | * rio_lock_device - Acquires host device lock for specified device |
1524 | * @port: Master port to send transaction |
1525 | * @destid: Destination ID for device/switch |
1526 | * @hopcount: Hopcount to reach switch |
1527 | * @wait_ms: Max wait time in msec (0 = no timeout) |
1528 | * |
1529 | * Attepts to acquire host device lock for specified device |
1530 | * Returns 0 if device lock acquired or EINVAL if timeout expires. |
1531 | */ |
1532 | int rio_lock_device(struct rio_mport *port, u16 destid, |
1533 | u8 hopcount, int wait_ms) |
1534 | { |
1535 | u32 result; |
1536 | int tcnt = 0; |
1537 | |
1538 | /* Attempt to acquire device lock */ |
1539 | rio_mport_write_config_32(port, destid, hopcount, |
1540 | RIO_HOST_DID_LOCK_CSR, data: port->host_deviceid); |
1541 | rio_mport_read_config_32(port, destid, hopcount, |
1542 | RIO_HOST_DID_LOCK_CSR, data: &result); |
1543 | |
1544 | while (result != port->host_deviceid) { |
1545 | if (wait_ms != 0 && tcnt == wait_ms) { |
1546 | pr_debug("RIO: timeout when locking device %x:%x\n" , |
1547 | destid, hopcount); |
1548 | return -EINVAL; |
1549 | } |
1550 | |
1551 | /* Delay a bit */ |
1552 | mdelay(1); |
1553 | tcnt++; |
1554 | /* Try to acquire device lock again */ |
1555 | rio_mport_write_config_32(port, destid, |
1556 | hopcount, |
1557 | RIO_HOST_DID_LOCK_CSR, |
1558 | data: port->host_deviceid); |
1559 | rio_mport_read_config_32(port, destid, |
1560 | hopcount, |
1561 | RIO_HOST_DID_LOCK_CSR, data: &result); |
1562 | } |
1563 | |
1564 | return 0; |
1565 | } |
1566 | EXPORT_SYMBOL_GPL(rio_lock_device); |
1567 | |
1568 | /** |
1569 | * rio_unlock_device - Releases host device lock for specified device |
1570 | * @port: Master port to send transaction |
1571 | * @destid: Destination ID for device/switch |
1572 | * @hopcount: Hopcount to reach switch |
1573 | * |
1574 | * Returns 0 if device lock released or EINVAL if fails. |
1575 | */ |
1576 | int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount) |
1577 | { |
1578 | u32 result; |
1579 | |
1580 | /* Release device lock */ |
1581 | rio_mport_write_config_32(port, destid, |
1582 | hopcount, |
1583 | RIO_HOST_DID_LOCK_CSR, |
1584 | data: port->host_deviceid); |
1585 | rio_mport_read_config_32(port, destid, hopcount, |
1586 | RIO_HOST_DID_LOCK_CSR, data: &result); |
1587 | if ((result & 0xffff) != 0xffff) { |
1588 | pr_debug("RIO: badness when releasing device lock %x:%x\n" , |
1589 | destid, hopcount); |
1590 | return -EINVAL; |
1591 | } |
1592 | |
1593 | return 0; |
1594 | } |
1595 | EXPORT_SYMBOL_GPL(rio_unlock_device); |
1596 | |
1597 | /** |
1598 | * rio_route_add_entry- Add a route entry to a switch routing table |
1599 | * @rdev: RIO device |
1600 | * @table: Routing table ID |
1601 | * @route_destid: Destination ID to be routed |
1602 | * @route_port: Port number to be routed |
1603 | * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock) |
1604 | * |
1605 | * If available calls the switch specific add_entry() method to add a route |
1606 | * entry into a switch routing table. Otherwise uses standard RT update method |
1607 | * as defined by RapidIO specification. A specific routing table can be selected |
1608 | * using the @table argument if a switch has per port routing tables or |
1609 | * the standard (or global) table may be used by passing |
1610 | * %RIO_GLOBAL_TABLE in @table. |
1611 | * |
1612 | * Returns %0 on success or %-EINVAL on failure. |
1613 | */ |
1614 | int rio_route_add_entry(struct rio_dev *rdev, |
1615 | u16 table, u16 route_destid, u8 route_port, int lock) |
1616 | { |
1617 | int rc = -EINVAL; |
1618 | struct rio_switch_ops *ops = rdev->rswitch->ops; |
1619 | |
1620 | if (lock) { |
1621 | rc = rio_lock_device(rdev->net->hport, rdev->destid, |
1622 | rdev->hopcount, 1000); |
1623 | if (rc) |
1624 | return rc; |
1625 | } |
1626 | |
1627 | spin_lock(lock: &rdev->rswitch->lock); |
1628 | |
1629 | if (!ops || !ops->add_entry) { |
1630 | rc = rio_std_route_add_entry(mport: rdev->net->hport, destid: rdev->destid, |
1631 | hopcount: rdev->hopcount, table, |
1632 | route_destid, route_port); |
1633 | } else if (try_module_get(module: ops->owner)) { |
1634 | rc = ops->add_entry(rdev->net->hport, rdev->destid, |
1635 | rdev->hopcount, table, route_destid, |
1636 | route_port); |
1637 | module_put(module: ops->owner); |
1638 | } |
1639 | |
1640 | spin_unlock(lock: &rdev->rswitch->lock); |
1641 | |
1642 | if (lock) |
1643 | rio_unlock_device(rdev->net->hport, rdev->destid, |
1644 | rdev->hopcount); |
1645 | |
1646 | return rc; |
1647 | } |
1648 | EXPORT_SYMBOL_GPL(rio_route_add_entry); |
1649 | |
1650 | /** |
1651 | * rio_route_get_entry- Read an entry from a switch routing table |
1652 | * @rdev: RIO device |
1653 | * @table: Routing table ID |
1654 | * @route_destid: Destination ID to be routed |
1655 | * @route_port: Pointer to read port number into |
1656 | * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock) |
1657 | * |
1658 | * If available calls the switch specific get_entry() method to fetch a route |
1659 | * entry from a switch routing table. Otherwise uses standard RT read method |
1660 | * as defined by RapidIO specification. A specific routing table can be selected |
1661 | * using the @table argument if a switch has per port routing tables or |
1662 | * the standard (or global) table may be used by passing |
1663 | * %RIO_GLOBAL_TABLE in @table. |
1664 | * |
1665 | * Returns %0 on success or %-EINVAL on failure. |
1666 | */ |
1667 | int rio_route_get_entry(struct rio_dev *rdev, u16 table, |
1668 | u16 route_destid, u8 *route_port, int lock) |
1669 | { |
1670 | int rc = -EINVAL; |
1671 | struct rio_switch_ops *ops = rdev->rswitch->ops; |
1672 | |
1673 | if (lock) { |
1674 | rc = rio_lock_device(rdev->net->hport, rdev->destid, |
1675 | rdev->hopcount, 1000); |
1676 | if (rc) |
1677 | return rc; |
1678 | } |
1679 | |
1680 | spin_lock(lock: &rdev->rswitch->lock); |
1681 | |
1682 | if (!ops || !ops->get_entry) { |
1683 | rc = rio_std_route_get_entry(mport: rdev->net->hport, destid: rdev->destid, |
1684 | hopcount: rdev->hopcount, table, |
1685 | route_destid, route_port); |
1686 | } else if (try_module_get(module: ops->owner)) { |
1687 | rc = ops->get_entry(rdev->net->hport, rdev->destid, |
1688 | rdev->hopcount, table, route_destid, |
1689 | route_port); |
1690 | module_put(module: ops->owner); |
1691 | } |
1692 | |
1693 | spin_unlock(lock: &rdev->rswitch->lock); |
1694 | |
1695 | if (lock) |
1696 | rio_unlock_device(rdev->net->hport, rdev->destid, |
1697 | rdev->hopcount); |
1698 | return rc; |
1699 | } |
1700 | EXPORT_SYMBOL_GPL(rio_route_get_entry); |
1701 | |
1702 | /** |
1703 | * rio_route_clr_table - Clear a switch routing table |
1704 | * @rdev: RIO device |
1705 | * @table: Routing table ID |
1706 | * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock) |
1707 | * |
1708 | * If available calls the switch specific clr_table() method to clear a switch |
1709 | * routing table. Otherwise uses standard RT write method as defined by RapidIO |
1710 | * specification. A specific routing table can be selected using the @table |
1711 | * argument if a switch has per port routing tables or the standard (or global) |
1712 | * table may be used by passing %RIO_GLOBAL_TABLE in @table. |
1713 | * |
1714 | * Returns %0 on success or %-EINVAL on failure. |
1715 | */ |
1716 | int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock) |
1717 | { |
1718 | int rc = -EINVAL; |
1719 | struct rio_switch_ops *ops = rdev->rswitch->ops; |
1720 | |
1721 | if (lock) { |
1722 | rc = rio_lock_device(rdev->net->hport, rdev->destid, |
1723 | rdev->hopcount, 1000); |
1724 | if (rc) |
1725 | return rc; |
1726 | } |
1727 | |
1728 | spin_lock(lock: &rdev->rswitch->lock); |
1729 | |
1730 | if (!ops || !ops->clr_table) { |
1731 | rc = rio_std_route_clr_table(mport: rdev->net->hport, destid: rdev->destid, |
1732 | hopcount: rdev->hopcount, table); |
1733 | } else if (try_module_get(module: ops->owner)) { |
1734 | rc = ops->clr_table(rdev->net->hport, rdev->destid, |
1735 | rdev->hopcount, table); |
1736 | |
1737 | module_put(module: ops->owner); |
1738 | } |
1739 | |
1740 | spin_unlock(lock: &rdev->rswitch->lock); |
1741 | |
1742 | if (lock) |
1743 | rio_unlock_device(rdev->net->hport, rdev->destid, |
1744 | rdev->hopcount); |
1745 | |
1746 | return rc; |
1747 | } |
1748 | EXPORT_SYMBOL_GPL(rio_route_clr_table); |
1749 | |
1750 | #ifdef CONFIG_RAPIDIO_DMA_ENGINE |
1751 | |
1752 | static bool rio_chan_filter(struct dma_chan *chan, void *arg) |
1753 | { |
1754 | struct rio_mport *mport = arg; |
1755 | |
1756 | /* Check that DMA device belongs to the right MPORT */ |
1757 | return mport == container_of(chan->device, struct rio_mport, dma); |
1758 | } |
1759 | |
1760 | /** |
1761 | * rio_request_mport_dma - request RapidIO capable DMA channel associated |
1762 | * with specified local RapidIO mport device. |
1763 | * @mport: RIO mport to perform DMA data transfers |
1764 | * |
1765 | * Returns pointer to allocated DMA channel or NULL if failed. |
1766 | */ |
1767 | struct dma_chan *rio_request_mport_dma(struct rio_mport *mport) |
1768 | { |
1769 | dma_cap_mask_t mask; |
1770 | |
1771 | dma_cap_zero(mask); |
1772 | dma_cap_set(DMA_SLAVE, mask); |
1773 | return dma_request_channel(mask, rio_chan_filter, mport); |
1774 | } |
1775 | EXPORT_SYMBOL_GPL(rio_request_mport_dma); |
1776 | |
1777 | /** |
1778 | * rio_request_dma - request RapidIO capable DMA channel that supports |
1779 | * specified target RapidIO device. |
1780 | * @rdev: RIO device associated with DMA transfer |
1781 | * |
1782 | * Returns pointer to allocated DMA channel or NULL if failed. |
1783 | */ |
1784 | struct dma_chan *rio_request_dma(struct rio_dev *rdev) |
1785 | { |
1786 | return rio_request_mport_dma(rdev->net->hport); |
1787 | } |
1788 | EXPORT_SYMBOL_GPL(rio_request_dma); |
1789 | |
1790 | /** |
1791 | * rio_release_dma - release specified DMA channel |
1792 | * @dchan: DMA channel to release |
1793 | */ |
1794 | void rio_release_dma(struct dma_chan *dchan) |
1795 | { |
1796 | dma_release_channel(chan: dchan); |
1797 | } |
1798 | EXPORT_SYMBOL_GPL(rio_release_dma); |
1799 | |
1800 | /** |
1801 | * rio_dma_prep_xfer - RapidIO specific wrapper |
1802 | * for device_prep_slave_sg callback defined by DMAENGINE. |
1803 | * @dchan: DMA channel to configure |
1804 | * @destid: target RapidIO device destination ID |
1805 | * @data: RIO specific data descriptor |
1806 | * @direction: DMA data transfer direction (TO or FROM the device) |
1807 | * @flags: dmaengine defined flags |
1808 | * |
1809 | * Initializes RapidIO capable DMA channel for the specified data transfer. |
1810 | * Uses DMA channel private extension to pass information related to remote |
1811 | * target RIO device. |
1812 | * |
1813 | * Returns: pointer to DMA transaction descriptor if successful, |
1814 | * error-valued pointer or NULL if failed. |
1815 | */ |
1816 | struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan, |
1817 | u16 destid, struct rio_dma_data *data, |
1818 | enum dma_transfer_direction direction, unsigned long flags) |
1819 | { |
1820 | struct rio_dma_ext rio_ext; |
1821 | |
1822 | if (!dchan->device->device_prep_slave_sg) { |
1823 | pr_err("%s: prep_rio_sg == NULL\n" , __func__); |
1824 | return NULL; |
1825 | } |
1826 | |
1827 | rio_ext.destid = destid; |
1828 | rio_ext.rio_addr_u = data->rio_addr_u; |
1829 | rio_ext.rio_addr = data->rio_addr; |
1830 | rio_ext.wr_type = data->wr_type; |
1831 | |
1832 | return dmaengine_prep_rio_sg(chan: dchan, sgl: data->sg, sg_len: data->sg_len, |
1833 | dir: direction, flags, rio_ext: &rio_ext); |
1834 | } |
1835 | EXPORT_SYMBOL_GPL(rio_dma_prep_xfer); |
1836 | |
1837 | /** |
1838 | * rio_dma_prep_slave_sg - RapidIO specific wrapper |
1839 | * for device_prep_slave_sg callback defined by DMAENGINE. |
1840 | * @rdev: RIO device control structure |
1841 | * @dchan: DMA channel to configure |
1842 | * @data: RIO specific data descriptor |
1843 | * @direction: DMA data transfer direction (TO or FROM the device) |
1844 | * @flags: dmaengine defined flags |
1845 | * |
1846 | * Initializes RapidIO capable DMA channel for the specified data transfer. |
1847 | * Uses DMA channel private extension to pass information related to remote |
1848 | * target RIO device. |
1849 | * |
1850 | * Returns: pointer to DMA transaction descriptor if successful, |
1851 | * error-valued pointer or NULL if failed. |
1852 | */ |
1853 | struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev, |
1854 | struct dma_chan *dchan, struct rio_dma_data *data, |
1855 | enum dma_transfer_direction direction, unsigned long flags) |
1856 | { |
1857 | return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags); |
1858 | } |
1859 | EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg); |
1860 | |
1861 | #endif /* CONFIG_RAPIDIO_DMA_ENGINE */ |
1862 | |
1863 | /** |
1864 | * rio_find_mport - find RIO mport by its ID |
1865 | * @mport_id: number (ID) of mport device |
1866 | * |
1867 | * Given a RIO mport number, the desired mport is located |
1868 | * in the global list of mports. If the mport is found, a pointer to its |
1869 | * data structure is returned. If no mport is found, %NULL is returned. |
1870 | */ |
1871 | struct rio_mport *rio_find_mport(int mport_id) |
1872 | { |
1873 | struct rio_mport *port; |
1874 | |
1875 | mutex_lock(&rio_mport_list_lock); |
1876 | list_for_each_entry(port, &rio_mports, node) { |
1877 | if (port->id == mport_id) |
1878 | goto found; |
1879 | } |
1880 | port = NULL; |
1881 | found: |
1882 | mutex_unlock(lock: &rio_mport_list_lock); |
1883 | |
1884 | return port; |
1885 | } |
1886 | |
1887 | /** |
1888 | * rio_register_scan - enumeration/discovery method registration interface |
1889 | * @mport_id: mport device ID for which fabric scan routine has to be set |
1890 | * (RIO_MPORT_ANY = set for all available mports) |
1891 | * @scan_ops: enumeration/discovery operations structure |
1892 | * |
1893 | * Registers enumeration/discovery operations with RapidIO subsystem and |
1894 | * attaches it to the specified mport device (or all available mports |
1895 | * if RIO_MPORT_ANY is specified). |
1896 | * |
1897 | * Returns error if the mport already has an enumerator attached to it. |
1898 | * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error). |
1899 | */ |
1900 | int rio_register_scan(int mport_id, struct rio_scan *scan_ops) |
1901 | { |
1902 | struct rio_mport *port; |
1903 | struct rio_scan_node *scan; |
1904 | int rc = 0; |
1905 | |
1906 | pr_debug("RIO: %s for mport_id=%d\n" , __func__, mport_id); |
1907 | |
1908 | if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) || |
1909 | !scan_ops) |
1910 | return -EINVAL; |
1911 | |
1912 | mutex_lock(&rio_mport_list_lock); |
1913 | |
1914 | /* |
1915 | * Check if there is another enumerator already registered for |
1916 | * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators |
1917 | * for the same mport ID are not supported. |
1918 | */ |
1919 | list_for_each_entry(scan, &rio_scans, node) { |
1920 | if (scan->mport_id == mport_id) { |
1921 | rc = -EBUSY; |
1922 | goto err_out; |
1923 | } |
1924 | } |
1925 | |
1926 | /* |
1927 | * Allocate and initialize new scan registration node. |
1928 | */ |
1929 | scan = kzalloc(size: sizeof(*scan), GFP_KERNEL); |
1930 | if (!scan) { |
1931 | rc = -ENOMEM; |
1932 | goto err_out; |
1933 | } |
1934 | |
1935 | scan->mport_id = mport_id; |
1936 | scan->ops = scan_ops; |
1937 | |
1938 | /* |
1939 | * Traverse the list of registered mports to attach this new scan. |
1940 | * |
1941 | * The new scan with matching mport ID overrides any previously attached |
1942 | * scan assuming that old scan (if any) is the default one (based on the |
1943 | * enumerator registration check above). |
1944 | * If the new scan is the global one, it will be attached only to mports |
1945 | * that do not have their own individual operations already attached. |
1946 | */ |
1947 | list_for_each_entry(port, &rio_mports, node) { |
1948 | if (port->id == mport_id) { |
1949 | port->nscan = scan_ops; |
1950 | break; |
1951 | } else if (mport_id == RIO_MPORT_ANY && !port->nscan) |
1952 | port->nscan = scan_ops; |
1953 | } |
1954 | |
1955 | list_add_tail(new: &scan->node, head: &rio_scans); |
1956 | |
1957 | err_out: |
1958 | mutex_unlock(lock: &rio_mport_list_lock); |
1959 | |
1960 | return rc; |
1961 | } |
1962 | EXPORT_SYMBOL_GPL(rio_register_scan); |
1963 | |
1964 | /** |
1965 | * rio_unregister_scan - removes enumeration/discovery method from mport |
1966 | * @mport_id: mport device ID for which fabric scan routine has to be |
1967 | * unregistered (RIO_MPORT_ANY = apply to all mports that use |
1968 | * the specified scan_ops) |
1969 | * @scan_ops: enumeration/discovery operations structure |
1970 | * |
1971 | * Removes enumeration or discovery method assigned to the specified mport |
1972 | * device. If RIO_MPORT_ANY is specified, removes the specified operations from |
1973 | * all mports that have them attached. |
1974 | */ |
1975 | int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops) |
1976 | { |
1977 | struct rio_mport *port; |
1978 | struct rio_scan_node *scan; |
1979 | |
1980 | pr_debug("RIO: %s for mport_id=%d\n" , __func__, mport_id); |
1981 | |
1982 | if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) |
1983 | return -EINVAL; |
1984 | |
1985 | mutex_lock(&rio_mport_list_lock); |
1986 | |
1987 | list_for_each_entry(port, &rio_mports, node) |
1988 | if (port->id == mport_id || |
1989 | (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops)) |
1990 | port->nscan = NULL; |
1991 | |
1992 | list_for_each_entry(scan, &rio_scans, node) { |
1993 | if (scan->mport_id == mport_id) { |
1994 | list_del(entry: &scan->node); |
1995 | kfree(objp: scan); |
1996 | break; |
1997 | } |
1998 | } |
1999 | |
2000 | mutex_unlock(lock: &rio_mport_list_lock); |
2001 | |
2002 | return 0; |
2003 | } |
2004 | EXPORT_SYMBOL_GPL(rio_unregister_scan); |
2005 | |
2006 | /** |
2007 | * rio_mport_scan - execute enumeration/discovery on the specified mport |
2008 | * @mport_id: number (ID) of mport device |
2009 | */ |
2010 | int rio_mport_scan(int mport_id) |
2011 | { |
2012 | struct rio_mport *port = NULL; |
2013 | int rc; |
2014 | |
2015 | mutex_lock(&rio_mport_list_lock); |
2016 | list_for_each_entry(port, &rio_mports, node) { |
2017 | if (port->id == mport_id) |
2018 | goto found; |
2019 | } |
2020 | mutex_unlock(lock: &rio_mport_list_lock); |
2021 | return -ENODEV; |
2022 | found: |
2023 | if (!port->nscan) { |
2024 | mutex_unlock(lock: &rio_mport_list_lock); |
2025 | return -EINVAL; |
2026 | } |
2027 | |
2028 | if (!try_module_get(module: port->nscan->owner)) { |
2029 | mutex_unlock(lock: &rio_mport_list_lock); |
2030 | return -ENODEV; |
2031 | } |
2032 | |
2033 | mutex_unlock(lock: &rio_mport_list_lock); |
2034 | |
2035 | if (port->host_deviceid >= 0) |
2036 | rc = port->nscan->enumerate(port, 0); |
2037 | else |
2038 | rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT); |
2039 | |
2040 | module_put(module: port->nscan->owner); |
2041 | return rc; |
2042 | } |
2043 | |
2044 | static struct workqueue_struct *rio_wq; |
2045 | |
2046 | struct rio_disc_work { |
2047 | struct work_struct work; |
2048 | struct rio_mport *mport; |
2049 | }; |
2050 | |
2051 | static void disc_work_handler(struct work_struct *_work) |
2052 | { |
2053 | struct rio_disc_work *work; |
2054 | |
2055 | work = container_of(_work, struct rio_disc_work, work); |
2056 | pr_debug("RIO: discovery work for mport %d %s\n" , |
2057 | work->mport->id, work->mport->name); |
2058 | if (try_module_get(module: work->mport->nscan->owner)) { |
2059 | work->mport->nscan->discover(work->mport, 0); |
2060 | module_put(module: work->mport->nscan->owner); |
2061 | } |
2062 | } |
2063 | |
2064 | int rio_init_mports(void) |
2065 | { |
2066 | struct rio_mport *port; |
2067 | struct rio_disc_work *work; |
2068 | int n = 0; |
2069 | |
2070 | if (!next_portid) |
2071 | return -ENODEV; |
2072 | |
2073 | /* |
2074 | * First, run enumerations and check if we need to perform discovery |
2075 | * on any of the registered mports. |
2076 | */ |
2077 | mutex_lock(&rio_mport_list_lock); |
2078 | list_for_each_entry(port, &rio_mports, node) { |
2079 | if (port->host_deviceid >= 0) { |
2080 | if (port->nscan && try_module_get(module: port->nscan->owner)) { |
2081 | port->nscan->enumerate(port, 0); |
2082 | module_put(module: port->nscan->owner); |
2083 | } |
2084 | } else |
2085 | n++; |
2086 | } |
2087 | mutex_unlock(lock: &rio_mport_list_lock); |
2088 | |
2089 | if (!n) |
2090 | goto no_disc; |
2091 | |
2092 | /* |
2093 | * If we have mports that require discovery schedule a discovery work |
2094 | * for each of them. If the code below fails to allocate needed |
2095 | * resources, exit without error to keep results of enumeration |
2096 | * process (if any). |
2097 | * TODO: Implement restart of discovery process for all or |
2098 | * individual discovering mports. |
2099 | */ |
2100 | rio_wq = alloc_workqueue(fmt: "riodisc" , flags: 0, max_active: 0); |
2101 | if (!rio_wq) { |
2102 | pr_err("RIO: unable allocate rio_wq\n" ); |
2103 | goto no_disc; |
2104 | } |
2105 | |
2106 | work = kcalloc(n, size: sizeof *work, GFP_KERNEL); |
2107 | if (!work) { |
2108 | destroy_workqueue(wq: rio_wq); |
2109 | goto no_disc; |
2110 | } |
2111 | |
2112 | n = 0; |
2113 | mutex_lock(&rio_mport_list_lock); |
2114 | list_for_each_entry(port, &rio_mports, node) { |
2115 | if (port->host_deviceid < 0 && port->nscan) { |
2116 | work[n].mport = port; |
2117 | INIT_WORK(&work[n].work, disc_work_handler); |
2118 | queue_work(wq: rio_wq, work: &work[n].work); |
2119 | n++; |
2120 | } |
2121 | } |
2122 | |
2123 | flush_workqueue(rio_wq); |
2124 | mutex_unlock(lock: &rio_mport_list_lock); |
2125 | pr_debug("RIO: destroy discovery workqueue\n" ); |
2126 | destroy_workqueue(wq: rio_wq); |
2127 | kfree(objp: work); |
2128 | |
2129 | no_disc: |
2130 | return 0; |
2131 | } |
2132 | EXPORT_SYMBOL_GPL(rio_init_mports); |
2133 | |
2134 | static int rio_get_hdid(int index) |
2135 | { |
2136 | if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS) |
2137 | return -1; |
2138 | |
2139 | return hdid[index]; |
2140 | } |
2141 | |
2142 | int rio_mport_initialize(struct rio_mport *mport) |
2143 | { |
2144 | if (next_portid >= RIO_MAX_MPORTS) { |
2145 | pr_err("RIO: reached specified max number of mports\n" ); |
2146 | return -ENODEV; |
2147 | } |
2148 | |
2149 | atomic_set(v: &mport->state, i: RIO_DEVICE_INITIALIZING); |
2150 | mport->id = next_portid++; |
2151 | mport->host_deviceid = rio_get_hdid(index: mport->id); |
2152 | mport->nscan = NULL; |
2153 | mutex_init(&mport->lock); |
2154 | mport->pwe_refcnt = 0; |
2155 | INIT_LIST_HEAD(list: &mport->pwrites); |
2156 | |
2157 | return 0; |
2158 | } |
2159 | EXPORT_SYMBOL_GPL(rio_mport_initialize); |
2160 | |
2161 | int rio_register_mport(struct rio_mport *port) |
2162 | { |
2163 | struct rio_scan_node *scan = NULL; |
2164 | int res = 0; |
2165 | |
2166 | mutex_lock(&rio_mport_list_lock); |
2167 | |
2168 | /* |
2169 | * Check if there are any registered enumeration/discovery operations |
2170 | * that have to be attached to the added mport. |
2171 | */ |
2172 | list_for_each_entry(scan, &rio_scans, node) { |
2173 | if (port->id == scan->mport_id || |
2174 | scan->mport_id == RIO_MPORT_ANY) { |
2175 | port->nscan = scan->ops; |
2176 | if (port->id == scan->mport_id) |
2177 | break; |
2178 | } |
2179 | } |
2180 | |
2181 | list_add_tail(new: &port->node, head: &rio_mports); |
2182 | mutex_unlock(lock: &rio_mport_list_lock); |
2183 | |
2184 | dev_set_name(dev: &port->dev, name: "rapidio%d" , port->id); |
2185 | port->dev.class = &rio_mport_class; |
2186 | atomic_set(v: &port->state, i: RIO_DEVICE_RUNNING); |
2187 | |
2188 | res = device_register(dev: &port->dev); |
2189 | if (res) { |
2190 | dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n" , |
2191 | port->id, res); |
2192 | mutex_lock(&rio_mport_list_lock); |
2193 | list_del(entry: &port->node); |
2194 | mutex_unlock(lock: &rio_mport_list_lock); |
2195 | put_device(dev: &port->dev); |
2196 | } else { |
2197 | dev_dbg(&port->dev, "RIO: registered mport%d\n" , port->id); |
2198 | } |
2199 | |
2200 | return res; |
2201 | } |
2202 | EXPORT_SYMBOL_GPL(rio_register_mport); |
2203 | |
2204 | static int rio_mport_cleanup_callback(struct device *dev, void *data) |
2205 | { |
2206 | struct rio_dev *rdev = to_rio_dev(dev); |
2207 | |
2208 | if (dev->bus == &rio_bus_type) |
2209 | rio_del_device(rdev, RIO_DEVICE_SHUTDOWN); |
2210 | return 0; |
2211 | } |
2212 | |
2213 | static int rio_net_remove_children(struct rio_net *net) |
2214 | { |
2215 | /* |
2216 | * Unregister all RapidIO devices residing on this net (this will |
2217 | * invoke notification of registered subsystem interfaces as well). |
2218 | */ |
2219 | device_for_each_child(dev: &net->dev, NULL, fn: rio_mport_cleanup_callback); |
2220 | return 0; |
2221 | } |
2222 | |
2223 | int rio_unregister_mport(struct rio_mport *port) |
2224 | { |
2225 | pr_debug("RIO: %s %s id=%d\n" , __func__, port->name, port->id); |
2226 | |
2227 | /* Transition mport to the SHUTDOWN state */ |
2228 | if (atomic_cmpxchg(v: &port->state, |
2229 | old: RIO_DEVICE_RUNNING, |
2230 | new: RIO_DEVICE_SHUTDOWN) != RIO_DEVICE_RUNNING) { |
2231 | pr_err("RIO: %s unexpected state transition for mport %s\n" , |
2232 | __func__, port->name); |
2233 | } |
2234 | |
2235 | if (port->net && port->net->hport == port) { |
2236 | rio_net_remove_children(net: port->net); |
2237 | rio_free_net(port->net); |
2238 | } |
2239 | |
2240 | /* |
2241 | * Unregister all RapidIO devices attached to this mport (this will |
2242 | * invoke notification of registered subsystem interfaces as well). |
2243 | */ |
2244 | mutex_lock(&rio_mport_list_lock); |
2245 | list_del(entry: &port->node); |
2246 | mutex_unlock(lock: &rio_mport_list_lock); |
2247 | device_unregister(dev: &port->dev); |
2248 | |
2249 | return 0; |
2250 | } |
2251 | EXPORT_SYMBOL_GPL(rio_unregister_mport); |
2252 | |