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1/*
2 * RapidIO interconnect services
3 * (RapidIO Interconnect Specification, http://www.rapidio.org)
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 *
8 * Copyright 2009 - 2013 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 */
16
17#include <linux/types.h>
18#include <linux/kernel.h>
19
20#include <linux/delay.h>
21#include <linux/init.h>
22#include <linux/rio.h>
23#include <linux/rio_drv.h>
24#include <linux/rio_ids.h>
25#include <linux/rio_regs.h>
26#include <linux/module.h>
27#include <linux/spinlock.h>
28#include <linux/slab.h>
29#include <linux/interrupt.h>
30
31#include "rio.h"
32
33/*
34 * struct rio_pwrite - RIO portwrite event
35 * @node: Node in list of doorbell events
36 * @pwcback: Doorbell event callback
37 * @context: Handler specific context to pass on event
38 */
39struct rio_pwrite {
40 struct list_head node;
41
42 int (*pwcback)(struct rio_mport *mport, void *context,
43 union rio_pw_msg *msg, int step);
44 void *context;
45};
46
47MODULE_DESCRIPTION("RapidIO Subsystem Core");
48MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
49MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
50MODULE_LICENSE("GPL");
51
52static int hdid[RIO_MAX_MPORTS];
53static int ids_num;
54module_param_array(hdid, int, &ids_num, 0);
55MODULE_PARM_DESC(hdid,
56 "Destination ID assignment to local RapidIO controllers");
57
58static LIST_HEAD(rio_devices);
59static LIST_HEAD(rio_nets);
60static DEFINE_SPINLOCK(rio_global_list_lock);
61
62static LIST_HEAD(rio_mports);
63static LIST_HEAD(rio_scans);
64static DEFINE_MUTEX(rio_mport_list_lock);
65static unsigned char next_portid;
66static DEFINE_SPINLOCK(rio_mmap_lock);
67
68/**
69 * rio_local_get_device_id - Get the base/extended device id for a port
70 * @port: RIO master port from which to get the deviceid
71 *
72 * Reads the base/extended device id from the local device
73 * implementing the master port. Returns the 8/16-bit device
74 * id.
75 */
76u16 rio_local_get_device_id(struct rio_mport *port)
77{
78 u32 result;
79
80 rio_local_read_config_32(port, RIO_DID_CSR, &result);
81
82 return (RIO_GET_DID(port->sys_size, result));
83}
84
85/**
86 * rio_query_mport - Query mport device attributes
87 * @port: mport device to query
88 * @mport_attr: mport attributes data structure
89 *
90 * Returns attributes of specified mport through the
91 * pointer to attributes data structure.
92 */
93int rio_query_mport(struct rio_mport *port,
94 struct rio_mport_attr *mport_attr)
95{
96 if (!port->ops->query_mport)
97 return -ENODATA;
98 return port->ops->query_mport(port, mport_attr);
99}
100EXPORT_SYMBOL(rio_query_mport);
101
102/**
103 * rio_alloc_net- Allocate and initialize a new RIO network data structure
104 * @mport: Master port associated with the RIO network
105 *
106 * Allocates a RIO network structure, initializes per-network
107 * list heads, and adds the associated master port to the
108 * network list of associated master ports. Returns a
109 * RIO network pointer on success or %NULL on failure.
110 */
111struct rio_net *rio_alloc_net(struct rio_mport *mport)
112{
113 struct rio_net *net;
114
115 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
116 if (net) {
117 INIT_LIST_HEAD(&net->node);
118 INIT_LIST_HEAD(&net->devices);
119 INIT_LIST_HEAD(&net->switches);
120 INIT_LIST_HEAD(&net->mports);
121 mport->net = net;
122 }
123 return net;
124}
125EXPORT_SYMBOL_GPL(rio_alloc_net);
126
127int rio_add_net(struct rio_net *net)
128{
129 int err;
130
131 err = device_register(&net->dev);
132 if (err)
133 return err;
134 spin_lock(&rio_global_list_lock);
135 list_add_tail(&net->node, &rio_nets);
136 spin_unlock(&rio_global_list_lock);
137
138 return 0;
139}
140EXPORT_SYMBOL_GPL(rio_add_net);
141
142void rio_free_net(struct rio_net *net)
143{
144 spin_lock(&rio_global_list_lock);
145 if (!list_empty(&net->node))
146 list_del(&net->node);
147 spin_unlock(&rio_global_list_lock);
148 if (net->release)
149 net->release(net);
150 device_unregister(&net->dev);
151}
152EXPORT_SYMBOL_GPL(rio_free_net);
153
154/**
155 * rio_local_set_device_id - Set the base/extended device id for a port
156 * @port: RIO master port
157 * @did: Device ID value to be written
158 *
159 * Writes the base/extended device id from a device.
160 */
161void rio_local_set_device_id(struct rio_mport *port, u16 did)
162{
163 rio_local_write_config_32(port, RIO_DID_CSR,
164 RIO_SET_DID(port->sys_size, did));
165}
166EXPORT_SYMBOL_GPL(rio_local_set_device_id);
167
168/**
169 * rio_add_device- Adds a RIO device to the device model
170 * @rdev: RIO device
171 *
172 * Adds the RIO device to the global device list and adds the RIO
173 * device to the RIO device list. Creates the generic sysfs nodes
174 * for an RIO device.
175 */
176int rio_add_device(struct rio_dev *rdev)
177{
178 int err;
179
180 atomic_set(&rdev->state, RIO_DEVICE_RUNNING);
181 err = device_register(&rdev->dev);
182 if (err)
183 return err;
184
185 spin_lock(&rio_global_list_lock);
186 list_add_tail(&rdev->global_list, &rio_devices);
187 if (rdev->net) {
188 list_add_tail(&rdev->net_list, &rdev->net->devices);
189 if (rdev->pef & RIO_PEF_SWITCH)
190 list_add_tail(&rdev->rswitch->node,
191 &rdev->net->switches);
192 }
193 spin_unlock(&rio_global_list_lock);
194
195 rio_create_sysfs_dev_files(rdev);
196
197 return 0;
198}
199EXPORT_SYMBOL_GPL(rio_add_device);
200
201/*
202 * rio_del_device - removes a RIO device from the device model
203 * @rdev: RIO device
204 * @state: device state to set during removal process
205 *
206 * Removes the RIO device to the kernel device list and subsystem's device list.
207 * Clears sysfs entries for the removed device.
208 */
209void rio_del_device(struct rio_dev *rdev, enum rio_device_state state)
210{
211 pr_debug("RIO: %s: removing %s\n", __func__, rio_name(rdev));
212 atomic_set(&rdev->state, state);
213 spin_lock(&rio_global_list_lock);
214 list_del(&rdev->global_list);
215 if (rdev->net) {
216 list_del(&rdev->net_list);
217 if (rdev->pef & RIO_PEF_SWITCH) {
218 list_del(&rdev->rswitch->node);
219 kfree(rdev->rswitch->route_table);
220 }
221 }
222 spin_unlock(&rio_global_list_lock);
223 rio_remove_sysfs_dev_files(rdev);
224 device_unregister(&rdev->dev);
225}
226EXPORT_SYMBOL_GPL(rio_del_device);
227
228/**
229 * rio_request_inb_mbox - request inbound mailbox service
230 * @mport: RIO master port from which to allocate the mailbox resource
231 * @dev_id: Device specific pointer to pass on event
232 * @mbox: Mailbox number to claim
233 * @entries: Number of entries in inbound mailbox queue
234 * @minb: Callback to execute when inbound message is received
235 *
236 * Requests ownership of an inbound mailbox resource and binds
237 * a callback function to the resource. Returns %0 on success.
238 */
239int rio_request_inb_mbox(struct rio_mport *mport,
240 void *dev_id,
241 int mbox,
242 int entries,
243 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
244 int slot))
245{
246 int rc = -ENOSYS;
247 struct resource *res;
248
249 if (mport->ops->open_inb_mbox == NULL)
250 goto out;
251
252 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
253
254 if (res) {
255 rio_init_mbox_res(res, mbox, mbox);
256
257 /* Make sure this mailbox isn't in use */
258 if ((rc =
259 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
260 res)) < 0) {
261 kfree(res);
262 goto out;
263 }
264
265 mport->inb_msg[mbox].res = res;
266
267 /* Hook the inbound message callback */
268 mport->inb_msg[mbox].mcback = minb;
269
270 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
271 } else
272 rc = -ENOMEM;
273
274 out:
275 return rc;
276}
277
278/**
279 * rio_release_inb_mbox - release inbound mailbox message service
280 * @mport: RIO master port from which to release the mailbox resource
281 * @mbox: Mailbox number to release
282 *
283 * Releases ownership of an inbound mailbox resource. Returns 0
284 * if the request has been satisfied.
285 */
286int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
287{
288 if (mport->ops->close_inb_mbox) {
289 mport->ops->close_inb_mbox(mport, mbox);
290
291 /* Release the mailbox resource */
292 return release_resource(mport->inb_msg[mbox].res);
293 } else
294 return -ENOSYS;
295}
296
297/**
298 * rio_request_outb_mbox - request outbound mailbox service
299 * @mport: RIO master port from which to allocate the mailbox resource
300 * @dev_id: Device specific pointer to pass on event
301 * @mbox: Mailbox number to claim
302 * @entries: Number of entries in outbound mailbox queue
303 * @moutb: Callback to execute when outbound message is sent
304 *
305 * Requests ownership of an outbound mailbox resource and binds
306 * a callback function to the resource. Returns 0 on success.
307 */
308int rio_request_outb_mbox(struct rio_mport *mport,
309 void *dev_id,
310 int mbox,
311 int entries,
312 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
313{
314 int rc = -ENOSYS;
315 struct resource *res;
316
317 if (mport->ops->open_outb_mbox == NULL)
318 goto out;
319
320 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
321
322 if (res) {
323 rio_init_mbox_res(res, mbox, mbox);
324
325 /* Make sure this outbound mailbox isn't in use */
326 if ((rc =
327 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
328 res)) < 0) {
329 kfree(res);
330 goto out;
331 }
332
333 mport->outb_msg[mbox].res = res;
334
335 /* Hook the inbound message callback */
336 mport->outb_msg[mbox].mcback = moutb;
337
338 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
339 } else
340 rc = -ENOMEM;
341
342 out:
343 return rc;
344}
345
346/**
347 * rio_release_outb_mbox - release outbound mailbox message service
348 * @mport: RIO master port from which to release the mailbox resource
349 * @mbox: Mailbox number to release
350 *
351 * Releases ownership of an inbound mailbox resource. Returns 0
352 * if the request has been satisfied.
353 */
354int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
355{
356 if (mport->ops->close_outb_mbox) {
357 mport->ops->close_outb_mbox(mport, mbox);
358
359 /* Release the mailbox resource */
360 return release_resource(mport->outb_msg[mbox].res);
361 } else
362 return -ENOSYS;
363}
364
365/**
366 * rio_setup_inb_dbell - bind inbound doorbell callback
367 * @mport: RIO master port to bind the doorbell callback
368 * @dev_id: Device specific pointer to pass on event
369 * @res: Doorbell message resource
370 * @dinb: Callback to execute when doorbell is received
371 *
372 * Adds a doorbell resource/callback pair into a port's
373 * doorbell event list. Returns 0 if the request has been
374 * satisfied.
375 */
376static int
377rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
378 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
379 u16 info))
380{
381 int rc = 0;
382 struct rio_dbell *dbell;
383
384 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
385 rc = -ENOMEM;
386 goto out;
387 }
388
389 dbell->res = res;
390 dbell->dinb = dinb;
391 dbell->dev_id = dev_id;
392
393 mutex_lock(&mport->lock);
394 list_add_tail(&dbell->node, &mport->dbells);
395 mutex_unlock(&mport->lock);
396
397 out:
398 return rc;
399}
400
401/**
402 * rio_request_inb_dbell - request inbound doorbell message service
403 * @mport: RIO master port from which to allocate the doorbell resource
404 * @dev_id: Device specific pointer to pass on event
405 * @start: Doorbell info range start
406 * @end: Doorbell info range end
407 * @dinb: Callback to execute when doorbell is received
408 *
409 * Requests ownership of an inbound doorbell resource and binds
410 * a callback function to the resource. Returns 0 if the request
411 * has been satisfied.
412 */
413int rio_request_inb_dbell(struct rio_mport *mport,
414 void *dev_id,
415 u16 start,
416 u16 end,
417 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
418 u16 dst, u16 info))
419{
420 int rc = 0;
421
422 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
423
424 if (res) {
425 rio_init_dbell_res(res, start, end);
426
427 /* Make sure these doorbells aren't in use */
428 if ((rc =
429 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
430 res)) < 0) {
431 kfree(res);
432 goto out;
433 }
434
435 /* Hook the doorbell callback */
436 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
437 } else
438 rc = -ENOMEM;
439
440 out:
441 return rc;
442}
443
444/**
445 * rio_release_inb_dbell - release inbound doorbell message service
446 * @mport: RIO master port from which to release the doorbell resource
447 * @start: Doorbell info range start
448 * @end: Doorbell info range end
449 *
450 * Releases ownership of an inbound doorbell resource and removes
451 * callback from the doorbell event list. Returns 0 if the request
452 * has been satisfied.
453 */
454int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
455{
456 int rc = 0, found = 0;
457 struct rio_dbell *dbell;
458
459 mutex_lock(&mport->lock);
460 list_for_each_entry(dbell, &mport->dbells, node) {
461 if ((dbell->res->start == start) && (dbell->res->end == end)) {
462 list_del(&dbell->node);
463 found = 1;
464 break;
465 }
466 }
467 mutex_unlock(&mport->lock);
468
469 /* If we can't find an exact match, fail */
470 if (!found) {
471 rc = -EINVAL;
472 goto out;
473 }
474
475 /* Release the doorbell resource */
476 rc = release_resource(dbell->res);
477
478 /* Free the doorbell event */
479 kfree(dbell);
480
481 out:
482 return rc;
483}
484
485/**
486 * rio_request_outb_dbell - request outbound doorbell message range
487 * @rdev: RIO device from which to allocate the doorbell resource
488 * @start: Doorbell message range start
489 * @end: Doorbell message range end
490 *
491 * Requests ownership of a doorbell message range. Returns a resource
492 * if the request has been satisfied or %NULL on failure.
493 */
494struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
495 u16 end)
496{
497 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
498
499 if (res) {
500 rio_init_dbell_res(res, start, end);
501
502 /* Make sure these doorbells aren't in use */
503 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
504 < 0) {
505 kfree(res);
506 res = NULL;
507 }
508 }
509
510 return res;
511}
512
513/**
514 * rio_release_outb_dbell - release outbound doorbell message range
515 * @rdev: RIO device from which to release the doorbell resource
516 * @res: Doorbell resource to be freed
517 *
518 * Releases ownership of a doorbell message range. Returns 0 if the
519 * request has been satisfied.
520 */
521int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
522{
523 int rc = release_resource(res);
524
525 kfree(res);
526
527 return rc;
528}
529
530/**
531 * rio_add_mport_pw_handler - add port-write message handler into the list
532 * of mport specific pw handlers
533 * @mport: RIO master port to bind the portwrite callback
534 * @context: Handler specific context to pass on event
535 * @pwcback: Callback to execute when portwrite is received
536 *
537 * Returns 0 if the request has been satisfied.
538 */
539int rio_add_mport_pw_handler(struct rio_mport *mport, void *context,
540 int (*pwcback)(struct rio_mport *mport,
541 void *context, union rio_pw_msg *msg, int step))
542{
543 int rc = 0;
544 struct rio_pwrite *pwrite;
545
546 pwrite = kzalloc(sizeof(struct rio_pwrite), GFP_KERNEL);
547 if (!pwrite) {
548 rc = -ENOMEM;
549 goto out;
550 }
551
552 pwrite->pwcback = pwcback;
553 pwrite->context = context;
554 mutex_lock(&mport->lock);
555 list_add_tail(&pwrite->node, &mport->pwrites);
556 mutex_unlock(&mport->lock);
557out:
558 return rc;
559}
560EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler);
561
562/**
563 * rio_del_mport_pw_handler - remove port-write message handler from the list
564 * of mport specific pw handlers
565 * @mport: RIO master port to bind the portwrite callback
566 * @context: Registered handler specific context to pass on event
567 * @pwcback: Registered callback function
568 *
569 * Returns 0 if the request has been satisfied.
570 */
571int rio_del_mport_pw_handler(struct rio_mport *mport, void *context,
572 int (*pwcback)(struct rio_mport *mport,
573 void *context, union rio_pw_msg *msg, int step))
574{
575 int rc = -EINVAL;
576 struct rio_pwrite *pwrite;
577
578 mutex_lock(&mport->lock);
579 list_for_each_entry(pwrite, &mport->pwrites, node) {
580 if (pwrite->pwcback == pwcback && pwrite->context == context) {
581 list_del(&pwrite->node);
582 kfree(pwrite);
583 rc = 0;
584 break;
585 }
586 }
587 mutex_unlock(&mport->lock);
588
589 return rc;
590}
591EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler);
592
593/**
594 * rio_request_inb_pwrite - request inbound port-write message service for
595 * specific RapidIO device
596 * @rdev: RIO device to which register inbound port-write callback routine
597 * @pwcback: Callback routine to execute when port-write is received
598 *
599 * Binds a port-write callback function to the RapidIO device.
600 * Returns 0 if the request has been satisfied.
601 */
602int rio_request_inb_pwrite(struct rio_dev *rdev,
603 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
604{
605 int rc = 0;
606
607 spin_lock(&rio_global_list_lock);
608 if (rdev->pwcback != NULL)
609 rc = -ENOMEM;
610 else
611 rdev->pwcback = pwcback;
612
613 spin_unlock(&rio_global_list_lock);
614 return rc;
615}
616EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
617
618/**
619 * rio_release_inb_pwrite - release inbound port-write message service
620 * associated with specific RapidIO device
621 * @rdev: RIO device which registered for inbound port-write callback
622 *
623 * Removes callback from the rio_dev structure. Returns 0 if the request
624 * has been satisfied.
625 */
626int rio_release_inb_pwrite(struct rio_dev *rdev)
627{
628 int rc = -ENOMEM;
629
630 spin_lock(&rio_global_list_lock);
631 if (rdev->pwcback) {
632 rdev->pwcback = NULL;
633 rc = 0;
634 }
635
636 spin_unlock(&rio_global_list_lock);
637 return rc;
638}
639EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
640
641/**
642 * rio_pw_enable - Enables/disables port-write handling by a master port
643 * @mport: Master port associated with port-write handling
644 * @enable: 1=enable, 0=disable
645 */
646void rio_pw_enable(struct rio_mport *mport, int enable)
647{
648 if (mport->ops->pwenable) {
649 mutex_lock(&mport->lock);
650
651 if ((enable && ++mport->pwe_refcnt == 1) ||
652 (!enable && mport->pwe_refcnt && --mport->pwe_refcnt == 0))
653 mport->ops->pwenable(mport, enable);
654 mutex_unlock(&mport->lock);
655 }
656}
657EXPORT_SYMBOL_GPL(rio_pw_enable);
658
659/**
660 * rio_map_inb_region -- Map inbound memory region.
661 * @mport: Master port.
662 * @local: physical address of memory region to be mapped
663 * @rbase: RIO base address assigned to this window
664 * @size: Size of the memory region
665 * @rflags: Flags for mapping.
666 *
667 * Return: 0 -- Success.
668 *
669 * This function will create the mapping from RIO space to local memory.
670 */
671int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
672 u64 rbase, u32 size, u32 rflags)
673{
674 int rc = 0;
675 unsigned long flags;
676
677 if (!mport->ops->map_inb)
678 return -1;
679 spin_lock_irqsave(&rio_mmap_lock, flags);
680 rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
681 spin_unlock_irqrestore(&rio_mmap_lock, flags);
682 return rc;
683}
684EXPORT_SYMBOL_GPL(rio_map_inb_region);
685
686/**
687 * rio_unmap_inb_region -- Unmap the inbound memory region
688 * @mport: Master port
689 * @lstart: physical address of memory region to be unmapped
690 */
691void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
692{
693 unsigned long flags;
694 if (!mport->ops->unmap_inb)
695 return;
696 spin_lock_irqsave(&rio_mmap_lock, flags);
697 mport->ops->unmap_inb(mport, lstart);
698 spin_unlock_irqrestore(&rio_mmap_lock, flags);
699}
700EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
701
702/**
703 * rio_map_outb_region -- Map outbound memory region.
704 * @mport: Master port.
705 * @destid: destination id window points to
706 * @rbase: RIO base address window translates to
707 * @size: Size of the memory region
708 * @rflags: Flags for mapping.
709 * @local: physical address of memory region mapped
710 *
711 * Return: 0 -- Success.
712 *
713 * This function will create the mapping from RIO space to local memory.
714 */
715int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase,
716 u32 size, u32 rflags, dma_addr_t *local)
717{
718 int rc = 0;
719 unsigned long flags;
720
721 if (!mport->ops->map_outb)
722 return -ENODEV;
723
724 spin_lock_irqsave(&rio_mmap_lock, flags);
725 rc = mport->ops->map_outb(mport, destid, rbase, size,
726 rflags, local);
727 spin_unlock_irqrestore(&rio_mmap_lock, flags);
728
729 return rc;
730}
731EXPORT_SYMBOL_GPL(rio_map_outb_region);
732
733/**
734 * rio_unmap_inb_region -- Unmap the inbound memory region
735 * @mport: Master port
736 * @destid: destination id mapping points to
737 * @rstart: RIO base address window translates to
738 */
739void rio_unmap_outb_region(struct rio_mport *mport, u16 destid, u64 rstart)
740{
741 unsigned long flags;
742
743 if (!mport->ops->unmap_outb)
744 return;
745
746 spin_lock_irqsave(&rio_mmap_lock, flags);
747 mport->ops->unmap_outb(mport, destid, rstart);
748 spin_unlock_irqrestore(&rio_mmap_lock, flags);
749}
750EXPORT_SYMBOL_GPL(rio_unmap_outb_region);
751
752/**
753 * rio_mport_get_physefb - Helper function that returns register offset
754 * for Physical Layer Extended Features Block.
755 * @port: Master port to issue transaction
756 * @local: Indicate a local master port or remote device access
757 * @destid: Destination ID of the device
758 * @hopcount: Number of switch hops to the device
759 */
760u32
761rio_mport_get_physefb(struct rio_mport *port, int local,
762 u16 destid, u8 hopcount)
763{
764 u32 ext_ftr_ptr;
765 u32 ftr_header;
766
767 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
768
769 while (ext_ftr_ptr) {
770 if (local)
771 rio_local_read_config_32(port, ext_ftr_ptr,
772 &ftr_header);
773 else
774 rio_mport_read_config_32(port, destid, hopcount,
775 ext_ftr_ptr, &ftr_header);
776
777 ftr_header = RIO_GET_BLOCK_ID(ftr_header);
778 switch (ftr_header) {
779
780 case RIO_EFB_SER_EP_ID_V13P:
781 case RIO_EFB_SER_EP_REC_ID_V13P:
782 case RIO_EFB_SER_EP_FREE_ID_V13P:
783 case RIO_EFB_SER_EP_ID:
784 case RIO_EFB_SER_EP_REC_ID:
785 case RIO_EFB_SER_EP_FREE_ID:
786 case RIO_EFB_SER_EP_FREC_ID:
787
788 return ext_ftr_ptr;
789
790 default:
791 break;
792 }
793
794 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
795 hopcount, ext_ftr_ptr);
796 }
797
798 return ext_ftr_ptr;
799}
800EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
801
802/**
803 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
804 * @comp_tag: RIO component tag to match
805 * @from: Previous RIO device found in search, or %NULL for new search
806 *
807 * Iterates through the list of known RIO devices. If a RIO device is
808 * found with a matching @comp_tag, a pointer to its device
809 * structure is returned. Otherwise, %NULL is returned. A new search
810 * is initiated by passing %NULL to the @from argument. Otherwise, if
811 * @from is not %NULL, searches continue from next device on the global
812 * list.
813 */
814struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
815{
816 struct list_head *n;
817 struct rio_dev *rdev;
818
819 spin_lock(&rio_global_list_lock);
820 n = from ? from->global_list.next : rio_devices.next;
821
822 while (n && (n != &rio_devices)) {
823 rdev = rio_dev_g(n);
824 if (rdev->comp_tag == comp_tag)
825 goto exit;
826 n = n->next;
827 }
828 rdev = NULL;
829exit:
830 spin_unlock(&rio_global_list_lock);
831 return rdev;
832}
833EXPORT_SYMBOL_GPL(rio_get_comptag);
834
835/**
836 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
837 * @rdev: Pointer to RIO device control structure
838 * @pnum: Switch port number to set LOCKOUT bit
839 * @lock: Operation : set (=1) or clear (=0)
840 */
841int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
842{
843 u32 regval;
844
845 rio_read_config_32(rdev,
846 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
847 ®val);
848 if (lock)
849 regval |= RIO_PORT_N_CTL_LOCKOUT;
850 else
851 regval &= ~RIO_PORT_N_CTL_LOCKOUT;
852
853 rio_write_config_32(rdev,
854 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
855 regval);
856 return 0;
857}
858EXPORT_SYMBOL_GPL(rio_set_port_lockout);
859
860/**
861 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
862 * given port
863 * @port: Master port associated with the RIO network
864 * @local: local=1 select local port otherwise a far device is reached
865 * @destid: Destination ID of the device to check host bit
866 * @hopcount: Number of hops to reach the target
867 * @port_num: Port (-number on switch) to enable on a far end device
868 *
869 * Returns 0 or 1 from on General Control Command and Status Register
870 * (EXT_PTR+0x3C)
871 */
872int rio_enable_rx_tx_port(struct rio_mport *port,
873 int local, u16 destid,
874 u8 hopcount, u8 port_num)
875{
876#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
877 u32 regval;
878 u32 ext_ftr_ptr;
879
880 /*
881 * enable rx input tx output port
882 */
883 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
884 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
885
886 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
887
888 if (local) {
889 rio_local_read_config_32(port, ext_ftr_ptr +
890 RIO_PORT_N_CTL_CSR(0),
891 ®val);
892 } else {
893 if (rio_mport_read_config_32(port, destid, hopcount,
894 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
895 return -EIO;
896 }
897
898 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
899 /* serial */
900 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
901 | RIO_PORT_N_CTL_EN_TX_SER;
902 } else {
903 /* parallel */
904 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
905 | RIO_PORT_N_CTL_EN_TX_PAR;
906 }
907
908 if (local) {
909 rio_local_write_config_32(port, ext_ftr_ptr +
910 RIO_PORT_N_CTL_CSR(0), regval);
911 } else {
912 if (rio_mport_write_config_32(port, destid, hopcount,
913 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
914 return -EIO;
915 }
916#endif
917 return 0;
918}
919EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
920
921
922/**
923 * rio_chk_dev_route - Validate route to the specified device.
924 * @rdev: RIO device failed to respond
925 * @nrdev: Last active device on the route to rdev
926 * @npnum: nrdev's port number on the route to rdev
927 *
928 * Follows a route to the specified RIO device to determine the last available
929 * device (and corresponding RIO port) on the route.
930 */
931static int
932rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
933{
934 u32 result;
935 int p_port, rc = -EIO;
936 struct rio_dev *prev = NULL;
937
938 /* Find switch with failed RIO link */
939 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
940 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
941 prev = rdev->prev;
942 break;
943 }
944 rdev = rdev->prev;
945 }
946
947 if (prev == NULL)
948 goto err_out;
949
950 p_port = prev->rswitch->route_table[rdev->destid];
951
952 if (p_port != RIO_INVALID_ROUTE) {
953 pr_debug("RIO: link failed on [%s]-P%d\n",
954 rio_name(prev), p_port);
955 *nrdev = prev;
956 *npnum = p_port;
957 rc = 0;
958 } else
959 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
960err_out:
961 return rc;
962}
963
964/**
965 * rio_mport_chk_dev_access - Validate access to the specified device.
966 * @mport: Master port to send transactions
967 * @destid: Device destination ID in network
968 * @hopcount: Number of hops into the network
969 */
970int
971rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
972{
973 int i = 0;
974 u32 tmp;
975
976 while (rio_mport_read_config_32(mport, destid, hopcount,
977 RIO_DEV_ID_CAR, &tmp)) {
978 i++;
979 if (i == RIO_MAX_CHK_RETRY)
980 return -EIO;
981 mdelay(1);
982 }
983
984 return 0;
985}
986EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
987
988/**
989 * rio_chk_dev_access - Validate access to the specified device.
990 * @rdev: Pointer to RIO device control structure
991 */
992static int rio_chk_dev_access(struct rio_dev *rdev)
993{
994 return rio_mport_chk_dev_access(rdev->net->hport,
995 rdev->destid, rdev->hopcount);
996}
997
998/**
999 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
1000 * returns link-response (if requested).
1001 * @rdev: RIO devive to issue Input-status command
1002 * @pnum: Device port number to issue the command
1003 * @lnkresp: Response from a link partner
1004 */
1005static int
1006rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
1007{
1008 u32 regval;
1009 int checkcount;
1010
1011 if (lnkresp) {
1012 /* Read from link maintenance response register
1013 * to clear valid bit */
1014 rio_read_config_32(rdev,
1015 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
1016 ®val);
1017 udelay(50);
1018 }
1019
1020 /* Issue Input-status command */
1021 rio_write_config_32(rdev,
1022 rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
1023 RIO_MNT_REQ_CMD_IS);
1024
1025 /* Exit if the response is not expected */
1026 if (lnkresp == NULL)
1027 return 0;
1028
1029 checkcount = 3;
1030 while (checkcount--) {
1031 udelay(50);
1032 rio_read_config_32(rdev,
1033 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
1034 ®val);
1035 if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
1036 *lnkresp = regval;
1037 return 0;
1038 }
1039 }
1040
1041 return -EIO;
1042}
1043
1044/**
1045 * rio_clr_err_stopped - Clears port Error-stopped states.
1046 * @rdev: Pointer to RIO device control structure
1047 * @pnum: Switch port number to clear errors
1048 * @err_status: port error status (if 0 reads register from device)
1049 */
1050static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
1051{
1052 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
1053 u32 regval;
1054 u32 far_ackid, far_linkstat, near_ackid;
1055
1056 if (err_status == 0)
1057 rio_read_config_32(rdev,
1058 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
1059 &err_status);
1060
1061 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
1062 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
1063 /*
1064 * Send a Link-Request/Input-Status control symbol
1065 */
1066 if (rio_get_input_status(rdev, pnum, ®val)) {
1067 pr_debug("RIO_EM: Input-status response timeout\n");
1068 goto rd_err;
1069 }
1070
1071 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
1072 pnum, regval);
1073 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
1074 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
1075 rio_read_config_32(rdev,
1076 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
1077 ®val);
1078 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
1079 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
1080 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
1081 " near_ackID=0x%02x\n",
1082 pnum, far_ackid, far_linkstat, near_ackid);
1083
1084 /*
1085 * If required, synchronize ackIDs of near and
1086 * far sides.
1087 */
1088 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
1089 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
1090 /* Align near outstanding/outbound ackIDs with
1091 * far inbound.
1092 */
1093 rio_write_config_32(rdev,
1094 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
1095 (near_ackid << 24) |
1096 (far_ackid << 8) | far_ackid);
1097 /* Align far outstanding/outbound ackIDs with
1098 * near inbound.
1099 */
1100 far_ackid++;
1101 if (nextdev)
1102 rio_write_config_32(nextdev,
1103 nextdev->phys_efptr +
1104 RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
1105 (far_ackid << 24) |
1106 (near_ackid << 8) | near_ackid);
1107 else
1108 pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
1109 }
1110rd_err:
1111 rio_read_config_32(rdev,
1112 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
1113 &err_status);
1114 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
1115 }
1116
1117 if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
1118 pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
1119 rio_get_input_status(nextdev,
1120 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
1121 udelay(50);
1122
1123 rio_read_config_32(rdev,
1124 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
1125 &err_status);
1126 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
1127 }
1128
1129 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
1130 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
1131}
1132
1133/**
1134 * rio_inb_pwrite_handler - inbound port-write message handler
1135 * @mport: mport device associated with port-write
1136 * @pw_msg: pointer to inbound port-write message
1137 *
1138 * Processes an inbound port-write message. Returns 0 if the request
1139 * has been satisfied.
1140 */
1141int rio_inb_pwrite_handler(struct rio_mport *mport, union rio_pw_msg *pw_msg)
1142{
1143 struct rio_dev *rdev;
1144 u32 err_status, em_perrdet, em_ltlerrdet;
1145 int rc, portnum;
1146 struct rio_pwrite *pwrite;
1147
1148#ifdef DEBUG_PW
1149 {
1150 u32 i;
1151
1152 pr_debug("%s: PW to mport_%d:\n", __func__, mport->id);
1153 for (i = 0; i < RIO_PW_MSG_SIZE / sizeof(u32); i = i + 4) {
1154 pr_debug("0x%02x: %08x %08x %08x %08x\n",
1155 i * 4, pw_msg->raw[i], pw_msg->raw[i + 1],
1156 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
1157 }
1158 }
1159#endif
1160
1161 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
1162 if (rdev) {
1163 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
1164 } else {
1165 pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
1166 __func__, pw_msg->em.comptag);
1167 }
1168
1169 /* Call a device-specific handler (if it is registered for the device).
1170 * This may be the service for endpoints that send device-specific
1171 * port-write messages. End-point messages expected to be handled
1172 * completely by EP specific device driver.
1173 * For switches rc==0 signals that no standard processing required.
1174 */
1175 if (rdev && rdev->pwcback) {
1176 rc = rdev->pwcback(rdev, pw_msg, 0);
1177 if (rc == 0)
1178 return 0;
1179 }
1180
1181 mutex_lock(&mport->lock);
1182 list_for_each_entry(pwrite, &mport->pwrites, node)
1183 pwrite->pwcback(mport, pwrite->context, pw_msg, 0);
1184 mutex_unlock(&mport->lock);
1185
1186 if (!rdev)
1187 return 0;
1188
1189 /*
1190 * FIXME: The code below stays as it was before for now until we decide
1191 * how to do default PW handling in combination with per-mport callbacks
1192 */
1193
1194 portnum = pw_msg->em.is_port & 0xFF;
1195
1196 /* Check if device and route to it are functional:
1197 * Sometimes devices may send PW message(s) just before being
1198 * powered down (or link being lost).
1199 */
1200 if (rio_chk_dev_access(rdev)) {
1201 pr_debug("RIO: device access failed - get link partner\n");
1202 /* Scan route to the device and identify failed link.
1203 * This will replace device and port reported in PW message.
1204 * PW message should not be used after this point.
1205 */
1206 if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
1207 pr_err("RIO: Route trace for %s failed\n",
1208 rio_name(rdev));
1209 return -EIO;
1210 }
1211 pw_msg = NULL;
1212 }
1213
1214 /* For End-point devices processing stops here */
1215 if (!(rdev->pef & RIO_PEF_SWITCH))
1216 return 0;
1217
1218 if (rdev->phys_efptr == 0) {
1219 pr_err("RIO_PW: Bad switch initialization for %s\n",
1220 rio_name(rdev));
1221 return 0;
1222 }
1223
1224 /*
1225 * Process the port-write notification from switch
1226 */
1227 if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
1228 rdev->rswitch->ops->em_handle(rdev, portnum);
1229
1230 rio_read_config_32(rdev,
1231 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1232 &err_status);
1233 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
1234
1235 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
1236
1237 if (!(rdev->rswitch->port_ok & (1 << portnum))) {
1238 rdev->rswitch->port_ok |= (1 << portnum);
1239 rio_set_port_lockout(rdev, portnum, 0);
1240 /* Schedule Insertion Service */
1241 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
1242 rio_name(rdev), portnum);
1243 }
1244
1245 /* Clear error-stopped states (if reported).
1246 * Depending on the link partner state, two attempts
1247 * may be needed for successful recovery.
1248 */
1249 if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
1250 RIO_PORT_N_ERR_STS_PW_INP_ES)) {
1251 if (rio_clr_err_stopped(rdev, portnum, err_status))
1252 rio_clr_err_stopped(rdev, portnum, 0);
1253 }
1254 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
1255
1256 if (rdev->rswitch->port_ok & (1 << portnum)) {
1257 rdev->rswitch->port_ok &= ~(1 << portnum);
1258 rio_set_port_lockout(rdev, portnum, 1);
1259
1260 rio_write_config_32(rdev,
1261 rdev->phys_efptr +
1262 RIO_PORT_N_ACK_STS_CSR(portnum),
1263 RIO_PORT_N_ACK_CLEAR);
1264
1265 /* Schedule Extraction Service */
1266 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
1267 rio_name(rdev), portnum);
1268 }
1269 }
1270
1271 rio_read_config_32(rdev,
1272 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
1273 if (em_perrdet) {
1274 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
1275 portnum, em_perrdet);
1276 /* Clear EM Port N Error Detect CSR */
1277 rio_write_config_32(rdev,
1278 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
1279 }
1280
1281 rio_read_config_32(rdev,
1282 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1283 if (em_ltlerrdet) {
1284 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1285 em_ltlerrdet);
1286 /* Clear EM L/T Layer Error Detect CSR */
1287 rio_write_config_32(rdev,
1288 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1289 }
1290
1291 /* Clear remaining error bits and Port-Write Pending bit */
1292 rio_write_config_32(rdev,
1293 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1294 err_status);
1295
1296 return 0;
1297}
1298EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1299
1300/**
1301 * rio_mport_get_efb - get pointer to next extended features block
1302 * @port: Master port to issue transaction
1303 * @local: Indicate a local master port or remote device access
1304 * @destid: Destination ID of the device
1305 * @hopcount: Number of switch hops to the device
1306 * @from: Offset of current Extended Feature block header (if 0 starts
1307 * from ExtFeaturePtr)
1308 */
1309u32
1310rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1311 u8 hopcount, u32 from)
1312{
1313 u32 reg_val;
1314
1315 if (from == 0) {
1316 if (local)
1317 rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1318 ®_val);
1319 else
1320 rio_mport_read_config_32(port, destid, hopcount,
1321 RIO_ASM_INFO_CAR, ®_val);
1322 return reg_val & RIO_EXT_FTR_PTR_MASK;
1323 } else {
1324 if (local)
1325 rio_local_read_config_32(port, from, ®_val);
1326 else
1327 rio_mport_read_config_32(port, destid, hopcount,
1328 from, ®_val);
1329 return RIO_GET_BLOCK_ID(reg_val);
1330 }
1331}
1332EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1333
1334/**
1335 * rio_mport_get_feature - query for devices' extended features
1336 * @port: Master port to issue transaction
1337 * @local: Indicate a local master port or remote device access
1338 * @destid: Destination ID of the device
1339 * @hopcount: Number of switch hops to the device
1340 * @ftr: Extended feature code
1341 *
1342 * Tell if a device supports a given RapidIO capability.
1343 * Returns the offset of the requested extended feature
1344 * block within the device's RIO configuration space or
1345 * 0 in case the device does not support it. Possible
1346 * values for @ftr:
1347 *
1348 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
1349 *
1350 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
1351 *
1352 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
1353 *
1354 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices
1355 *
1356 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
1357 *
1358 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
1359 */
1360u32
1361rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1362 u8 hopcount, int ftr)
1363{
1364 u32 asm_info, ext_ftr_ptr, ftr_header;
1365
1366 if (local)
1367 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1368 else
1369 rio_mport_read_config_32(port, destid, hopcount,
1370 RIO_ASM_INFO_CAR, &asm_info);
1371
1372 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1373
1374 while (ext_ftr_ptr) {
1375 if (local)
1376 rio_local_read_config_32(port, ext_ftr_ptr,
1377 &ftr_header);
1378 else
1379 rio_mport_read_config_32(port, destid, hopcount,
1380 ext_ftr_ptr, &ftr_header);
1381 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1382 return ext_ftr_ptr;
1383 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1384 break;
1385 }
1386
1387 return 0;
1388}
1389EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1390
1391/**
1392 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1393 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1394 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1395 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1396 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1397 * @from: Previous RIO device found in search, or %NULL for new search
1398 *
1399 * Iterates through the list of known RIO devices. If a RIO device is
1400 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1401 * count to the device is incrememted and a pointer to its device
1402 * structure is returned. Otherwise, %NULL is returned. A new search
1403 * is initiated by passing %NULL to the @from argument. Otherwise, if
1404 * @from is not %NULL, searches continue from next device on the global
1405 * list. The reference count for @from is always decremented if it is
1406 * not %NULL.
1407 */
1408struct rio_dev *rio_get_asm(u16 vid, u16 did,
1409 u16 asm_vid, u16 asm_did, struct rio_dev *from)
1410{
1411 struct list_head *n;
1412 struct rio_dev *rdev;
1413
1414 WARN_ON(in_interrupt());
1415 spin_lock(&rio_global_list_lock);
1416 n = from ? from->global_list.next : rio_devices.next;
1417
1418 while (n && (n != &rio_devices)) {
1419 rdev = rio_dev_g(n);
1420 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1421 (did == RIO_ANY_ID || rdev->did == did) &&
1422 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1423 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1424 goto exit;
1425 n = n->next;
1426 }
1427 rdev = NULL;
1428 exit:
1429 rio_dev_put(from);
1430 rdev = rio_dev_get(rdev);
1431 spin_unlock(&rio_global_list_lock);
1432 return rdev;
1433}
1434
1435/**
1436 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1437 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1438 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1439 * @from: Previous RIO device found in search, or %NULL for new search
1440 *
1441 * Iterates through the list of known RIO devices. If a RIO device is
1442 * found with a matching @vid and @did, the reference count to the
1443 * device is incrememted and a pointer to its device structure is returned.
1444 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1445 * to the @from argument. Otherwise, if @from is not %NULL, searches
1446 * continue from next device on the global list. The reference count for
1447 * @from is always decremented if it is not %NULL.
1448 */
1449struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1450{
1451 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1452}
1453
1454/**
1455 * rio_std_route_add_entry - Add switch route table entry using standard
1456 * registers defined in RIO specification rev.1.3
1457 * @mport: Master port to issue transaction
1458 * @destid: Destination ID of the device
1459 * @hopcount: Number of switch hops to the device
1460 * @table: routing table ID (global or port-specific)
1461 * @route_destid: destID entry in the RT
1462 * @route_port: destination port for specified destID
1463 */
1464static int
1465rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1466 u16 table, u16 route_destid, u8 route_port)
1467{
1468 if (table == RIO_GLOBAL_TABLE) {
1469 rio_mport_write_config_32(mport, destid, hopcount,
1470 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1471 (u32)route_destid);
1472 rio_mport_write_config_32(mport, destid, hopcount,
1473 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1474 (u32)route_port);
1475 }
1476
1477 udelay(10);
1478 return 0;
1479}
1480
1481/**
1482 * rio_std_route_get_entry - Read switch route table entry (port number)
1483 * associated with specified destID using standard registers defined in RIO
1484 * specification rev.1.3
1485 * @mport: Master port to issue transaction
1486 * @destid: Destination ID of the device
1487 * @hopcount: Number of switch hops to the device
1488 * @table: routing table ID (global or port-specific)
1489 * @route_destid: destID entry in the RT
1490 * @route_port: returned destination port for specified destID
1491 */
1492static int
1493rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1494 u16 table, u16 route_destid, u8 *route_port)
1495{
1496 u32 result;
1497
1498 if (table == RIO_GLOBAL_TABLE) {
1499 rio_mport_write_config_32(mport, destid, hopcount,
1500 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1501 rio_mport_read_config_32(mport, destid, hopcount,
1502 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1503
1504 *route_port = (u8)result;
1505 }
1506
1507 return 0;
1508}
1509
1510/**
1511 * rio_std_route_clr_table - Clear swotch route table using standard registers
1512 * defined in RIO specification rev.1.3.
1513 * @mport: Master port to issue transaction
1514 * @destid: Destination ID of the device
1515 * @hopcount: Number of switch hops to the device
1516 * @table: routing table ID (global or port-specific)
1517 */
1518static int
1519rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1520 u16 table)
1521{
1522 u32 max_destid = 0xff;
1523 u32 i, pef, id_inc = 1, ext_cfg = 0;
1524 u32 port_sel = RIO_INVALID_ROUTE;
1525
1526 if (table == RIO_GLOBAL_TABLE) {
1527 rio_mport_read_config_32(mport, destid, hopcount,
1528 RIO_PEF_CAR, &pef);
1529
1530 if (mport->sys_size) {
1531 rio_mport_read_config_32(mport, destid, hopcount,
1532 RIO_SWITCH_RT_LIMIT,
1533 &max_destid);
1534 max_destid &= RIO_RT_MAX_DESTID;
1535 }
1536
1537 if (pef & RIO_PEF_EXT_RT) {
1538 ext_cfg = 0x80000000;
1539 id_inc = 4;
1540 port_sel = (RIO_INVALID_ROUTE << 24) |
1541 (RIO_INVALID_ROUTE << 16) |
1542 (RIO_INVALID_ROUTE << 8) |
1543 RIO_INVALID_ROUTE;
1544 }
1545
1546 for (i = 0; i <= max_destid;) {
1547 rio_mport_write_config_32(mport, destid, hopcount,
1548 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1549 ext_cfg | i);
1550 rio_mport_write_config_32(mport, destid, hopcount,
1551 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1552 port_sel);
1553 i += id_inc;
1554 }
1555 }
1556
1557 udelay(10);
1558 return 0;
1559}
1560
1561/**
1562 * rio_lock_device - Acquires host device lock for specified device
1563 * @port: Master port to send transaction
1564 * @destid: Destination ID for device/switch
1565 * @hopcount: Hopcount to reach switch
1566 * @wait_ms: Max wait time in msec (0 = no timeout)
1567 *
1568 * Attepts to acquire host device lock for specified device
1569 * Returns 0 if device lock acquired or EINVAL if timeout expires.
1570 */
1571int rio_lock_device(struct rio_mport *port, u16 destid,
1572 u8 hopcount, int wait_ms)
1573{
1574 u32 result;
1575 int tcnt = 0;
1576
1577 /* Attempt to acquire device lock */
1578 rio_mport_write_config_32(port, destid, hopcount,
1579 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
1580 rio_mport_read_config_32(port, destid, hopcount,
1581 RIO_HOST_DID_LOCK_CSR, &result);
1582
1583 while (result != port->host_deviceid) {
1584 if (wait_ms != 0 && tcnt == wait_ms) {
1585 pr_debug("RIO: timeout when locking device %x:%x\n",
1586 destid, hopcount);
1587 return -EINVAL;
1588 }
1589
1590 /* Delay a bit */
1591 mdelay(1);
1592 tcnt++;
1593 /* Try to acquire device lock again */
1594 rio_mport_write_config_32(port, destid,
1595 hopcount,
1596 RIO_HOST_DID_LOCK_CSR,
1597 port->host_deviceid);
1598 rio_mport_read_config_32(port, destid,
1599 hopcount,
1600 RIO_HOST_DID_LOCK_CSR, &result);
1601 }
1602
1603 return 0;
1604}
1605EXPORT_SYMBOL_GPL(rio_lock_device);
1606
1607/**
1608 * rio_unlock_device - Releases host device lock for specified device
1609 * @port: Master port to send transaction
1610 * @destid: Destination ID for device/switch
1611 * @hopcount: Hopcount to reach switch
1612 *
1613 * Returns 0 if device lock released or EINVAL if fails.
1614 */
1615int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
1616{
1617 u32 result;
1618
1619 /* Release device lock */
1620 rio_mport_write_config_32(port, destid,
1621 hopcount,
1622 RIO_HOST_DID_LOCK_CSR,
1623 port->host_deviceid);
1624 rio_mport_read_config_32(port, destid, hopcount,
1625 RIO_HOST_DID_LOCK_CSR, &result);
1626 if ((result & 0xffff) != 0xffff) {
1627 pr_debug("RIO: badness when releasing device lock %x:%x\n",
1628 destid, hopcount);
1629 return -EINVAL;
1630 }
1631
1632 return 0;
1633}
1634EXPORT_SYMBOL_GPL(rio_unlock_device);
1635
1636/**
1637 * rio_route_add_entry- Add a route entry to a switch routing table
1638 * @rdev: RIO device
1639 * @table: Routing table ID
1640 * @route_destid: Destination ID to be routed
1641 * @route_port: Port number to be routed
1642 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1643 *
1644 * If available calls the switch specific add_entry() method to add a route
1645 * entry into a switch routing table. Otherwise uses standard RT update method
1646 * as defined by RapidIO specification. A specific routing table can be selected
1647 * using the @table argument if a switch has per port routing tables or
1648 * the standard (or global) table may be used by passing
1649 * %RIO_GLOBAL_TABLE in @table.
1650 *
1651 * Returns %0 on success or %-EINVAL on failure.
1652 */
1653int rio_route_add_entry(struct rio_dev *rdev,
1654 u16 table, u16 route_destid, u8 route_port, int lock)
1655{
1656 int rc = -EINVAL;
1657 struct rio_switch_ops *ops = rdev->rswitch->ops;
1658
1659 if (lock) {
1660 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1661 rdev->hopcount, 1000);
1662 if (rc)
1663 return rc;
1664 }
1665
1666 spin_lock(&rdev->rswitch->lock);
1667
1668 if (ops == NULL || ops->add_entry == NULL) {
1669 rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
1670 rdev->hopcount, table,
1671 route_destid, route_port);
1672 } else if (try_module_get(ops->owner)) {
1673 rc = ops->add_entry(rdev->net->hport, rdev->destid,
1674 rdev->hopcount, table, route_destid,
1675 route_port);
1676 module_put(ops->owner);
1677 }
1678
1679 spin_unlock(&rdev->rswitch->lock);
1680
1681 if (lock)
1682 rio_unlock_device(rdev->net->hport, rdev->destid,
1683 rdev->hopcount);
1684
1685 return rc;
1686}
1687EXPORT_SYMBOL_GPL(rio_route_add_entry);
1688
1689/**
1690 * rio_route_get_entry- Read an entry from a switch routing table
1691 * @rdev: RIO device
1692 * @table: Routing table ID
1693 * @route_destid: Destination ID to be routed
1694 * @route_port: Pointer to read port number into
1695 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1696 *
1697 * If available calls the switch specific get_entry() method to fetch a route
1698 * entry from a switch routing table. Otherwise uses standard RT read method
1699 * as defined by RapidIO specification. A specific routing table can be selected
1700 * using the @table argument if a switch has per port routing tables or
1701 * the standard (or global) table may be used by passing
1702 * %RIO_GLOBAL_TABLE in @table.
1703 *
1704 * Returns %0 on success or %-EINVAL on failure.
1705 */
1706int rio_route_get_entry(struct rio_dev *rdev, u16 table,
1707 u16 route_destid, u8 *route_port, int lock)
1708{
1709 int rc = -EINVAL;
1710 struct rio_switch_ops *ops = rdev->rswitch->ops;
1711
1712 if (lock) {
1713 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1714 rdev->hopcount, 1000);
1715 if (rc)
1716 return rc;
1717 }
1718
1719 spin_lock(&rdev->rswitch->lock);
1720
1721 if (ops == NULL || ops->get_entry == NULL) {
1722 rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
1723 rdev->hopcount, table,
1724 route_destid, route_port);
1725 } else if (try_module_get(ops->owner)) {
1726 rc = ops->get_entry(rdev->net->hport, rdev->destid,
1727 rdev->hopcount, table, route_destid,
1728 route_port);
1729 module_put(ops->owner);
1730 }
1731
1732 spin_unlock(&rdev->rswitch->lock);
1733
1734 if (lock)
1735 rio_unlock_device(rdev->net->hport, rdev->destid,
1736 rdev->hopcount);
1737 return rc;
1738}
1739EXPORT_SYMBOL_GPL(rio_route_get_entry);
1740
1741/**
1742 * rio_route_clr_table - Clear a switch routing table
1743 * @rdev: RIO device
1744 * @table: Routing table ID
1745 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1746 *
1747 * If available calls the switch specific clr_table() method to clear a switch
1748 * routing table. Otherwise uses standard RT write method as defined by RapidIO
1749 * specification. A specific routing table can be selected using the @table
1750 * argument if a switch has per port routing tables or the standard (or global)
1751 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
1752 *
1753 * Returns %0 on success or %-EINVAL on failure.
1754 */
1755int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
1756{
1757 int rc = -EINVAL;
1758 struct rio_switch_ops *ops = rdev->rswitch->ops;
1759
1760 if (lock) {
1761 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1762 rdev->hopcount, 1000);
1763 if (rc)
1764 return rc;
1765 }
1766
1767 spin_lock(&rdev->rswitch->lock);
1768
1769 if (ops == NULL || ops->clr_table == NULL) {
1770 rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
1771 rdev->hopcount, table);
1772 } else if (try_module_get(ops->owner)) {
1773 rc = ops->clr_table(rdev->net->hport, rdev->destid,
1774 rdev->hopcount, table);
1775
1776 module_put(ops->owner);
1777 }
1778
1779 spin_unlock(&rdev->rswitch->lock);
1780
1781 if (lock)
1782 rio_unlock_device(rdev->net->hport, rdev->destid,
1783 rdev->hopcount);
1784
1785 return rc;
1786}
1787EXPORT_SYMBOL_GPL(rio_route_clr_table);
1788
1789#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1790
1791static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1792{
1793 struct rio_mport *mport = arg;
1794
1795 /* Check that DMA device belongs to the right MPORT */
1796 return mport == container_of(chan->device, struct rio_mport, dma);
1797}
1798
1799/**
1800 * rio_request_mport_dma - request RapidIO capable DMA channel associated
1801 * with specified local RapidIO mport device.
1802 * @mport: RIO mport to perform DMA data transfers
1803 *
1804 * Returns pointer to allocated DMA channel or NULL if failed.
1805 */
1806struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
1807{
1808 dma_cap_mask_t mask;
1809
1810 dma_cap_zero(mask);
1811 dma_cap_set(DMA_SLAVE, mask);
1812 return dma_request_channel(mask, rio_chan_filter, mport);
1813}
1814EXPORT_SYMBOL_GPL(rio_request_mport_dma);
1815
1816/**
1817 * rio_request_dma - request RapidIO capable DMA channel that supports
1818 * specified target RapidIO device.
1819 * @rdev: RIO device associated with DMA transfer
1820 *
1821 * Returns pointer to allocated DMA channel or NULL if failed.
1822 */
1823struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1824{
1825 return rio_request_mport_dma(rdev->net->hport);
1826}
1827EXPORT_SYMBOL_GPL(rio_request_dma);
1828
1829/**
1830 * rio_release_dma - release specified DMA channel
1831 * @dchan: DMA channel to release
1832 */
1833void rio_release_dma(struct dma_chan *dchan)
1834{
1835 dma_release_channel(dchan);
1836}
1837EXPORT_SYMBOL_GPL(rio_release_dma);
1838
1839/**
1840 * rio_dma_prep_xfer - RapidIO specific wrapper
1841 * for device_prep_slave_sg callback defined by DMAENGINE.
1842 * @dchan: DMA channel to configure
1843 * @destid: target RapidIO device destination ID
1844 * @data: RIO specific data descriptor
1845 * @direction: DMA data transfer direction (TO or FROM the device)
1846 * @flags: dmaengine defined flags
1847 *
1848 * Initializes RapidIO capable DMA channel for the specified data transfer.
1849 * Uses DMA channel private extension to pass information related to remote
1850 * target RIO device.
1851 * Returns pointer to DMA transaction descriptor or NULL if failed.
1852 */
1853struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
1854 u16 destid, struct rio_dma_data *data,
1855 enum dma_transfer_direction direction, unsigned long flags)
1856{
1857 struct rio_dma_ext rio_ext;
1858
1859 if (dchan->device->device_prep_slave_sg == NULL) {
1860 pr_err("%s: prep_rio_sg == NULL\n", __func__);
1861 return NULL;
1862 }
1863
1864 rio_ext.destid = destid;
1865 rio_ext.rio_addr_u = data->rio_addr_u;
1866 rio_ext.rio_addr = data->rio_addr;
1867 rio_ext.wr_type = data->wr_type;
1868
1869 return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1870 direction, flags, &rio_ext);
1871}
1872EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
1873
1874/**
1875 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1876 * for device_prep_slave_sg callback defined by DMAENGINE.
1877 * @rdev: RIO device control structure
1878 * @dchan: DMA channel to configure
1879 * @data: RIO specific data descriptor
1880 * @direction: DMA data transfer direction (TO or FROM the device)
1881 * @flags: dmaengine defined flags
1882 *
1883 * Initializes RapidIO capable DMA channel for the specified data transfer.
1884 * Uses DMA channel private extension to pass information related to remote
1885 * target RIO device.
1886 * Returns pointer to DMA transaction descriptor or NULL if failed.
1887 */
1888struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1889 struct dma_chan *dchan, struct rio_dma_data *data,
1890 enum dma_transfer_direction direction, unsigned long flags)
1891{
1892 return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);
1893}
1894EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1895
1896#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1897
1898/**
1899 * rio_find_mport - find RIO mport by its ID
1900 * @mport_id: number (ID) of mport device
1901 *
1902 * Given a RIO mport number, the desired mport is located
1903 * in the global list of mports. If the mport is found, a pointer to its
1904 * data structure is returned. If no mport is found, %NULL is returned.
1905 */
1906struct rio_mport *rio_find_mport(int mport_id)
1907{
1908 struct rio_mport *port;
1909
1910 mutex_lock(&rio_mport_list_lock);
1911 list_for_each_entry(port, &rio_mports, node) {
1912 if (port->id == mport_id)
1913 goto found;
1914 }
1915 port = NULL;
1916found:
1917 mutex_unlock(&rio_mport_list_lock);
1918
1919 return port;
1920}
1921
1922/**
1923 * rio_register_scan - enumeration/discovery method registration interface
1924 * @mport_id: mport device ID for which fabric scan routine has to be set
1925 * (RIO_MPORT_ANY = set for all available mports)
1926 * @scan_ops: enumeration/discovery operations structure
1927 *
1928 * Registers enumeration/discovery operations with RapidIO subsystem and
1929 * attaches it to the specified mport device (or all available mports
1930 * if RIO_MPORT_ANY is specified).
1931 *
1932 * Returns error if the mport already has an enumerator attached to it.
1933 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1934 */
1935int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1936{
1937 struct rio_mport *port;
1938 struct rio_scan_node *scan;
1939 int rc = 0;
1940
1941 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1942
1943 if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
1944 !scan_ops)
1945 return -EINVAL;
1946
1947 mutex_lock(&rio_mport_list_lock);
1948
1949 /*
1950 * Check if there is another enumerator already registered for
1951 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
1952 * for the same mport ID are not supported.
1953 */
1954 list_for_each_entry(scan, &rio_scans, node) {
1955 if (scan->mport_id == mport_id) {
1956 rc = -EBUSY;
1957 goto err_out;
1958 }
1959 }
1960
1961 /*
1962 * Allocate and initialize new scan registration node.
1963 */
1964 scan = kzalloc(sizeof(*scan), GFP_KERNEL);
1965 if (!scan) {
1966 rc = -ENOMEM;
1967 goto err_out;
1968 }
1969
1970 scan->mport_id = mport_id;
1971 scan->ops = scan_ops;
1972
1973 /*
1974 * Traverse the list of registered mports to attach this new scan.
1975 *
1976 * The new scan with matching mport ID overrides any previously attached
1977 * scan assuming that old scan (if any) is the default one (based on the
1978 * enumerator registration check above).
1979 * If the new scan is the global one, it will be attached only to mports
1980 * that do not have their own individual operations already attached.
1981 */
1982 list_for_each_entry(port, &rio_mports, node) {
1983 if (port->id == mport_id) {
1984 port->nscan = scan_ops;
1985 break;
1986 } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
1987 port->nscan = scan_ops;
1988 }
1989
1990 list_add_tail(&scan->node, &rio_scans);
1991
1992err_out:
1993 mutex_unlock(&rio_mport_list_lock);
1994
1995 return rc;
1996}
1997EXPORT_SYMBOL_GPL(rio_register_scan);
1998
1999/**
2000 * rio_unregister_scan - removes enumeration/discovery method from mport
2001 * @mport_id: mport device ID for which fabric scan routine has to be
2002 * unregistered (RIO_MPORT_ANY = apply to all mports that use
2003 * the specified scan_ops)
2004 * @scan_ops: enumeration/discovery operations structure
2005 *
2006 * Removes enumeration or discovery method assigned to the specified mport
2007 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
2008 * all mports that have them attached.
2009 */
2010int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
2011{
2012 struct rio_mport *port;
2013 struct rio_scan_node *scan;
2014
2015 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
2016
2017 if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
2018 return -EINVAL;
2019
2020 mutex_lock(&rio_mport_list_lock);
2021
2022 list_for_each_entry(port, &rio_mports, node)
2023 if (port->id == mport_id ||
2024 (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
2025 port->nscan = NULL;
2026
2027 list_for_each_entry(scan, &rio_scans, node) {
2028 if (scan->mport_id == mport_id) {
2029 list_del(&scan->node);
2030 kfree(scan);
2031 break;
2032 }
2033 }
2034
2035 mutex_unlock(&rio_mport_list_lock);
2036
2037 return 0;
2038}
2039EXPORT_SYMBOL_GPL(rio_unregister_scan);
2040
2041/**
2042 * rio_mport_scan - execute enumeration/discovery on the specified mport
2043 * @mport_id: number (ID) of mport device
2044 */
2045int rio_mport_scan(int mport_id)
2046{
2047 struct rio_mport *port = NULL;
2048 int rc;
2049
2050 mutex_lock(&rio_mport_list_lock);
2051 list_for_each_entry(port, &rio_mports, node) {
2052 if (port->id == mport_id)
2053 goto found;
2054 }
2055 mutex_unlock(&rio_mport_list_lock);
2056 return -ENODEV;
2057found:
2058 if (!port->nscan) {
2059 mutex_unlock(&rio_mport_list_lock);
2060 return -EINVAL;
2061 }
2062
2063 if (!try_module_get(port->nscan->owner)) {
2064 mutex_unlock(&rio_mport_list_lock);
2065 return -ENODEV;
2066 }
2067
2068 mutex_unlock(&rio_mport_list_lock);
2069
2070 if (port->host_deviceid >= 0)
2071 rc = port->nscan->enumerate(port, 0);
2072 else
2073 rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
2074
2075 module_put(port->nscan->owner);
2076 return rc;
2077}
2078
2079static void rio_fixup_device(struct rio_dev *dev)
2080{
2081}
2082
2083static int rio_init(void)
2084{
2085 struct rio_dev *dev = NULL;
2086
2087 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
2088 rio_fixup_device(dev);
2089 }
2090 return 0;
2091}
2092
2093static struct workqueue_struct *rio_wq;
2094
2095struct rio_disc_work {
2096 struct work_struct work;
2097 struct rio_mport *mport;
2098};
2099
2100static void disc_work_handler(struct work_struct *_work)
2101{
2102 struct rio_disc_work *work;
2103
2104 work = container_of(_work, struct rio_disc_work, work);
2105 pr_debug("RIO: discovery work for mport %d %s\n",
2106 work->mport->id, work->mport->name);
2107 if (try_module_get(work->mport->nscan->owner)) {
2108 work->mport->nscan->discover(work->mport, 0);
2109 module_put(work->mport->nscan->owner);
2110 }
2111}
2112
2113int rio_init_mports(void)
2114{
2115 struct rio_mport *port;
2116 struct rio_disc_work *work;
2117 int n = 0;
2118
2119 if (!next_portid)
2120 return -ENODEV;
2121
2122 /*
2123 * First, run enumerations and check if we need to perform discovery
2124 * on any of the registered mports.
2125 */
2126 mutex_lock(&rio_mport_list_lock);
2127 list_for_each_entry(port, &rio_mports, node) {
2128 if (port->host_deviceid >= 0) {
2129 if (port->nscan && try_module_get(port->nscan->owner)) {
2130 port->nscan->enumerate(port, 0);
2131 module_put(port->nscan->owner);
2132 }
2133 } else
2134 n++;
2135 }
2136 mutex_unlock(&rio_mport_list_lock);
2137
2138 if (!n)
2139 goto no_disc;
2140
2141 /*
2142 * If we have mports that require discovery schedule a discovery work
2143 * for each of them. If the code below fails to allocate needed
2144 * resources, exit without error to keep results of enumeration
2145 * process (if any).
2146 * TODO: Implement restart of discovery process for all or
2147 * individual discovering mports.
2148 */
2149 rio_wq = alloc_workqueue("riodisc", 0, 0);
2150 if (!rio_wq) {
2151 pr_err("RIO: unable allocate rio_wq\n");
2152 goto no_disc;
2153 }
2154
2155 work = kcalloc(n, sizeof *work, GFP_KERNEL);
2156 if (!work) {
2157 pr_err("RIO: no memory for work struct\n");
2158 destroy_workqueue(rio_wq);
2159 goto no_disc;
2160 }
2161
2162 n = 0;
2163 mutex_lock(&rio_mport_list_lock);
2164 list_for_each_entry(port, &rio_mports, node) {
2165 if (port->host_deviceid < 0 && port->nscan) {
2166 work[n].mport = port;
2167 INIT_WORK(&work[n].work, disc_work_handler);
2168 queue_work(rio_wq, &work[n].work);
2169 n++;
2170 }
2171 }
2172
2173 flush_workqueue(rio_wq);
2174 mutex_unlock(&rio_mport_list_lock);
2175 pr_debug("RIO: destroy discovery workqueue\n");
2176 destroy_workqueue(rio_wq);
2177 kfree(work);
2178
2179no_disc:
2180 rio_init();
2181
2182 return 0;
2183}
2184
2185static int rio_get_hdid(int index)
2186{
2187 if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
2188 return -1;
2189
2190 return hdid[index];
2191}
2192
2193int rio_mport_initialize(struct rio_mport *mport)
2194{
2195 if (next_portid >= RIO_MAX_MPORTS) {
2196 pr_err("RIO: reached specified max number of mports\n");
2197 return -ENODEV;
2198 }
2199
2200 atomic_set(&mport->state, RIO_DEVICE_INITIALIZING);
2201 mport->id = next_portid++;
2202 mport->host_deviceid = rio_get_hdid(mport->id);
2203 mport->nscan = NULL;
2204 mutex_init(&mport->lock);
2205 mport->pwe_refcnt = 0;
2206 INIT_LIST_HEAD(&mport->pwrites);
2207
2208 return 0;
2209}
2210EXPORT_SYMBOL_GPL(rio_mport_initialize);
2211
2212int rio_register_mport(struct rio_mport *port)
2213{
2214 struct rio_scan_node *scan = NULL;
2215 int res = 0;
2216
2217 mutex_lock(&rio_mport_list_lock);
2218
2219 /*
2220 * Check if there are any registered enumeration/discovery operations
2221 * that have to be attached to the added mport.
2222 */
2223 list_for_each_entry(scan, &rio_scans, node) {
2224 if (port->id == scan->mport_id ||
2225 scan->mport_id == RIO_MPORT_ANY) {
2226 port->nscan = scan->ops;
2227 if (port->id == scan->mport_id)
2228 break;
2229 }
2230 }
2231
2232 list_add_tail(&port->node, &rio_mports);
2233 mutex_unlock(&rio_mport_list_lock);
2234
2235 dev_set_name(&port->dev, "rapidio%d", port->id);
2236 port->dev.class = &rio_mport_class;
2237 atomic_set(&port->state, RIO_DEVICE_RUNNING);
2238
2239 res = device_register(&port->dev);
2240 if (res)
2241 dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
2242 port->id, res);
2243 else
2244 dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);
2245
2246 return res;
2247}
2248EXPORT_SYMBOL_GPL(rio_register_mport);
2249
2250static int rio_mport_cleanup_callback(struct device *dev, void *data)
2251{
2252 struct rio_dev *rdev = to_rio_dev(dev);
2253
2254 if (dev->bus == &rio_bus_type)
2255 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
2256 return 0;
2257}
2258
2259static int rio_net_remove_children(struct rio_net *net)
2260{
2261 /*
2262 * Unregister all RapidIO devices residing on this net (this will
2263 * invoke notification of registered subsystem interfaces as well).
2264 */
2265 device_for_each_child(&net->dev, NULL, rio_mport_cleanup_callback);
2266 return 0;
2267}
2268
2269int rio_unregister_mport(struct rio_mport *port)
2270{
2271 pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
2272
2273 /* Transition mport to the SHUTDOWN state */
2274 if (atomic_cmpxchg(&port->state,
2275 RIO_DEVICE_RUNNING,
2276 RIO_DEVICE_SHUTDOWN) != RIO_DEVICE_RUNNING) {
2277 pr_err("RIO: %s unexpected state transition for mport %s\n",
2278 __func__, port->name);
2279 }
2280
2281 if (port->net && port->net->hport == port) {
2282 rio_net_remove_children(port->net);
2283 rio_free_net(port->net);
2284 }
2285
2286 /*
2287 * Unregister all RapidIO devices attached to this mport (this will
2288 * invoke notification of registered subsystem interfaces as well).
2289 */
2290 mutex_lock(&rio_mport_list_lock);
2291 list_del(&port->node);
2292 mutex_unlock(&rio_mport_list_lock);
2293 device_unregister(&port->dev);
2294
2295 return 0;
2296}
2297EXPORT_SYMBOL_GPL(rio_unregister_mport);
2298
2299EXPORT_SYMBOL_GPL(rio_local_get_device_id);
2300EXPORT_SYMBOL_GPL(rio_get_device);
2301EXPORT_SYMBOL_GPL(rio_get_asm);
2302EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
2303EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
2304EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
2305EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
2306EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
2307EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
2308EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
2309EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
2310EXPORT_SYMBOL_GPL(rio_init_mports);
1/*
2 * RapidIO interconnect services
3 * (RapidIO Interconnect Specification, http://www.rapidio.org)
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 *
8 * Copyright 2009 - 2013 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 */
16
17#include <linux/types.h>
18#include <linux/kernel.h>
19
20#include <linux/delay.h>
21#include <linux/init.h>
22#include <linux/rio.h>
23#include <linux/rio_drv.h>
24#include <linux/rio_ids.h>
25#include <linux/rio_regs.h>
26#include <linux/module.h>
27#include <linux/spinlock.h>
28#include <linux/slab.h>
29#include <linux/interrupt.h>
30
31#include "rio.h"
32
33/*
34 * struct rio_pwrite - RIO portwrite event
35 * @node: Node in list of doorbell events
36 * @pwcback: Doorbell event callback
37 * @context: Handler specific context to pass on event
38 */
39struct rio_pwrite {
40 struct list_head node;
41
42 int (*pwcback)(struct rio_mport *mport, void *context,
43 union rio_pw_msg *msg, int step);
44 void *context;
45};
46
47MODULE_DESCRIPTION("RapidIO Subsystem Core");
48MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
49MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
50MODULE_LICENSE("GPL");
51
52static int hdid[RIO_MAX_MPORTS];
53static int ids_num;
54module_param_array(hdid, int, &ids_num, 0);
55MODULE_PARM_DESC(hdid,
56 "Destination ID assignment to local RapidIO controllers");
57
58static LIST_HEAD(rio_devices);
59static LIST_HEAD(rio_nets);
60static DEFINE_SPINLOCK(rio_global_list_lock);
61
62static LIST_HEAD(rio_mports);
63static LIST_HEAD(rio_scans);
64static DEFINE_MUTEX(rio_mport_list_lock);
65static unsigned char next_portid;
66static DEFINE_SPINLOCK(rio_mmap_lock);
67
68/**
69 * rio_local_get_device_id - Get the base/extended device id for a port
70 * @port: RIO master port from which to get the deviceid
71 *
72 * Reads the base/extended device id from the local device
73 * implementing the master port. Returns the 8/16-bit device
74 * id.
75 */
76u16 rio_local_get_device_id(struct rio_mport *port)
77{
78 u32 result;
79
80 rio_local_read_config_32(port, RIO_DID_CSR, &result);
81
82 return (RIO_GET_DID(port->sys_size, result));
83}
84
85/**
86 * rio_query_mport - Query mport device attributes
87 * @port: mport device to query
88 * @mport_attr: mport attributes data structure
89 *
90 * Returns attributes of specified mport through the
91 * pointer to attributes data structure.
92 */
93int rio_query_mport(struct rio_mport *port,
94 struct rio_mport_attr *mport_attr)
95{
96 if (!port->ops->query_mport)
97 return -ENODATA;
98 return port->ops->query_mport(port, mport_attr);
99}
100EXPORT_SYMBOL(rio_query_mport);
101
102/**
103 * rio_alloc_net- Allocate and initialize a new RIO network data structure
104 * @mport: Master port associated with the RIO network
105 *
106 * Allocates a RIO network structure, initializes per-network
107 * list heads, and adds the associated master port to the
108 * network list of associated master ports. Returns a
109 * RIO network pointer on success or %NULL on failure.
110 */
111struct rio_net *rio_alloc_net(struct rio_mport *mport)
112{
113 struct rio_net *net;
114
115 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
116 if (net) {
117 INIT_LIST_HEAD(&net->node);
118 INIT_LIST_HEAD(&net->devices);
119 INIT_LIST_HEAD(&net->switches);
120 INIT_LIST_HEAD(&net->mports);
121 mport->net = net;
122 }
123 return net;
124}
125EXPORT_SYMBOL_GPL(rio_alloc_net);
126
127int rio_add_net(struct rio_net *net)
128{
129 int err;
130
131 err = device_register(&net->dev);
132 if (err)
133 return err;
134 spin_lock(&rio_global_list_lock);
135 list_add_tail(&net->node, &rio_nets);
136 spin_unlock(&rio_global_list_lock);
137
138 return 0;
139}
140EXPORT_SYMBOL_GPL(rio_add_net);
141
142void rio_free_net(struct rio_net *net)
143{
144 spin_lock(&rio_global_list_lock);
145 if (!list_empty(&net->node))
146 list_del(&net->node);
147 spin_unlock(&rio_global_list_lock);
148 if (net->release)
149 net->release(net);
150 device_unregister(&net->dev);
151}
152EXPORT_SYMBOL_GPL(rio_free_net);
153
154/**
155 * rio_local_set_device_id - Set the base/extended device id for a port
156 * @port: RIO master port
157 * @did: Device ID value to be written
158 *
159 * Writes the base/extended device id from a device.
160 */
161void rio_local_set_device_id(struct rio_mport *port, u16 did)
162{
163 rio_local_write_config_32(port, RIO_DID_CSR,
164 RIO_SET_DID(port->sys_size, did));
165}
166EXPORT_SYMBOL_GPL(rio_local_set_device_id);
167
168/**
169 * rio_add_device- Adds a RIO device to the device model
170 * @rdev: RIO device
171 *
172 * Adds the RIO device to the global device list and adds the RIO
173 * device to the RIO device list. Creates the generic sysfs nodes
174 * for an RIO device.
175 */
176int rio_add_device(struct rio_dev *rdev)
177{
178 int err;
179
180 atomic_set(&rdev->state, RIO_DEVICE_RUNNING);
181 err = device_register(&rdev->dev);
182 if (err)
183 return err;
184
185 spin_lock(&rio_global_list_lock);
186 list_add_tail(&rdev->global_list, &rio_devices);
187 if (rdev->net) {
188 list_add_tail(&rdev->net_list, &rdev->net->devices);
189 if (rdev->pef & RIO_PEF_SWITCH)
190 list_add_tail(&rdev->rswitch->node,
191 &rdev->net->switches);
192 }
193 spin_unlock(&rio_global_list_lock);
194
195 rio_create_sysfs_dev_files(rdev);
196
197 return 0;
198}
199EXPORT_SYMBOL_GPL(rio_add_device);
200
201/*
202 * rio_del_device - removes a RIO device from the device model
203 * @rdev: RIO device
204 * @state: device state to set during removal process
205 *
206 * Removes the RIO device to the kernel device list and subsystem's device list.
207 * Clears sysfs entries for the removed device.
208 */
209void rio_del_device(struct rio_dev *rdev, enum rio_device_state state)
210{
211 pr_debug("RIO: %s: removing %s\n", __func__, rio_name(rdev));
212 atomic_set(&rdev->state, state);
213 spin_lock(&rio_global_list_lock);
214 list_del(&rdev->global_list);
215 if (rdev->net) {
216 list_del(&rdev->net_list);
217 if (rdev->pef & RIO_PEF_SWITCH) {
218 list_del(&rdev->rswitch->node);
219 kfree(rdev->rswitch->route_table);
220 }
221 }
222 spin_unlock(&rio_global_list_lock);
223 rio_remove_sysfs_dev_files(rdev);
224 device_unregister(&rdev->dev);
225}
226EXPORT_SYMBOL_GPL(rio_del_device);
227
228/**
229 * rio_request_inb_mbox - request inbound mailbox service
230 * @mport: RIO master port from which to allocate the mailbox resource
231 * @dev_id: Device specific pointer to pass on event
232 * @mbox: Mailbox number to claim
233 * @entries: Number of entries in inbound mailbox queue
234 * @minb: Callback to execute when inbound message is received
235 *
236 * Requests ownership of an inbound mailbox resource and binds
237 * a callback function to the resource. Returns %0 on success.
238 */
239int rio_request_inb_mbox(struct rio_mport *mport,
240 void *dev_id,
241 int mbox,
242 int entries,
243 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
244 int slot))
245{
246 int rc = -ENOSYS;
247 struct resource *res;
248
249 if (mport->ops->open_inb_mbox == NULL)
250 goto out;
251
252 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
253
254 if (res) {
255 rio_init_mbox_res(res, mbox, mbox);
256
257 /* Make sure this mailbox isn't in use */
258 if ((rc =
259 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
260 res)) < 0) {
261 kfree(res);
262 goto out;
263 }
264
265 mport->inb_msg[mbox].res = res;
266
267 /* Hook the inbound message callback */
268 mport->inb_msg[mbox].mcback = minb;
269
270 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
271 if (rc) {
272 mport->inb_msg[mbox].mcback = NULL;
273 mport->inb_msg[mbox].res = NULL;
274 release_resource(res);
275 kfree(res);
276 }
277 } else
278 rc = -ENOMEM;
279
280 out:
281 return rc;
282}
283
284/**
285 * rio_release_inb_mbox - release inbound mailbox message service
286 * @mport: RIO master port from which to release the mailbox resource
287 * @mbox: Mailbox number to release
288 *
289 * Releases ownership of an inbound mailbox resource. Returns 0
290 * if the request has been satisfied.
291 */
292int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
293{
294 int rc;
295
296 if (!mport->ops->close_inb_mbox || !mport->inb_msg[mbox].res)
297 return -EINVAL;
298
299 mport->ops->close_inb_mbox(mport, mbox);
300 mport->inb_msg[mbox].mcback = NULL;
301
302 rc = release_resource(mport->inb_msg[mbox].res);
303 if (rc)
304 return rc;
305
306 kfree(mport->inb_msg[mbox].res);
307 mport->inb_msg[mbox].res = NULL;
308
309 return 0;
310}
311
312/**
313 * rio_request_outb_mbox - request outbound mailbox service
314 * @mport: RIO master port from which to allocate the mailbox resource
315 * @dev_id: Device specific pointer to pass on event
316 * @mbox: Mailbox number to claim
317 * @entries: Number of entries in outbound mailbox queue
318 * @moutb: Callback to execute when outbound message is sent
319 *
320 * Requests ownership of an outbound mailbox resource and binds
321 * a callback function to the resource. Returns 0 on success.
322 */
323int rio_request_outb_mbox(struct rio_mport *mport,
324 void *dev_id,
325 int mbox,
326 int entries,
327 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
328{
329 int rc = -ENOSYS;
330 struct resource *res;
331
332 if (mport->ops->open_outb_mbox == NULL)
333 goto out;
334
335 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
336
337 if (res) {
338 rio_init_mbox_res(res, mbox, mbox);
339
340 /* Make sure this outbound mailbox isn't in use */
341 if ((rc =
342 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
343 res)) < 0) {
344 kfree(res);
345 goto out;
346 }
347
348 mport->outb_msg[mbox].res = res;
349
350 /* Hook the inbound message callback */
351 mport->outb_msg[mbox].mcback = moutb;
352
353 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
354 if (rc) {
355 mport->outb_msg[mbox].mcback = NULL;
356 mport->outb_msg[mbox].res = NULL;
357 release_resource(res);
358 kfree(res);
359 }
360 } else
361 rc = -ENOMEM;
362
363 out:
364 return rc;
365}
366
367/**
368 * rio_release_outb_mbox - release outbound mailbox message service
369 * @mport: RIO master port from which to release the mailbox resource
370 * @mbox: Mailbox number to release
371 *
372 * Releases ownership of an inbound mailbox resource. Returns 0
373 * if the request has been satisfied.
374 */
375int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
376{
377 int rc;
378
379 if (!mport->ops->close_outb_mbox || !mport->outb_msg[mbox].res)
380 return -EINVAL;
381
382 mport->ops->close_outb_mbox(mport, mbox);
383 mport->outb_msg[mbox].mcback = NULL;
384
385 rc = release_resource(mport->outb_msg[mbox].res);
386 if (rc)
387 return rc;
388
389 kfree(mport->outb_msg[mbox].res);
390 mport->outb_msg[mbox].res = NULL;
391
392 return 0;
393}
394
395/**
396 * rio_setup_inb_dbell - bind inbound doorbell callback
397 * @mport: RIO master port to bind the doorbell callback
398 * @dev_id: Device specific pointer to pass on event
399 * @res: Doorbell message resource
400 * @dinb: Callback to execute when doorbell is received
401 *
402 * Adds a doorbell resource/callback pair into a port's
403 * doorbell event list. Returns 0 if the request has been
404 * satisfied.
405 */
406static int
407rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
408 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
409 u16 info))
410{
411 int rc = 0;
412 struct rio_dbell *dbell;
413
414 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
415 rc = -ENOMEM;
416 goto out;
417 }
418
419 dbell->res = res;
420 dbell->dinb = dinb;
421 dbell->dev_id = dev_id;
422
423 mutex_lock(&mport->lock);
424 list_add_tail(&dbell->node, &mport->dbells);
425 mutex_unlock(&mport->lock);
426
427 out:
428 return rc;
429}
430
431/**
432 * rio_request_inb_dbell - request inbound doorbell message service
433 * @mport: RIO master port from which to allocate the doorbell resource
434 * @dev_id: Device specific pointer to pass on event
435 * @start: Doorbell info range start
436 * @end: Doorbell info range end
437 * @dinb: Callback to execute when doorbell is received
438 *
439 * Requests ownership of an inbound doorbell resource and binds
440 * a callback function to the resource. Returns 0 if the request
441 * has been satisfied.
442 */
443int rio_request_inb_dbell(struct rio_mport *mport,
444 void *dev_id,
445 u16 start,
446 u16 end,
447 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
448 u16 dst, u16 info))
449{
450 int rc = 0;
451
452 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
453
454 if (res) {
455 rio_init_dbell_res(res, start, end);
456
457 /* Make sure these doorbells aren't in use */
458 if ((rc =
459 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
460 res)) < 0) {
461 kfree(res);
462 goto out;
463 }
464
465 /* Hook the doorbell callback */
466 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
467 } else
468 rc = -ENOMEM;
469
470 out:
471 return rc;
472}
473
474/**
475 * rio_release_inb_dbell - release inbound doorbell message service
476 * @mport: RIO master port from which to release the doorbell resource
477 * @start: Doorbell info range start
478 * @end: Doorbell info range end
479 *
480 * Releases ownership of an inbound doorbell resource and removes
481 * callback from the doorbell event list. Returns 0 if the request
482 * has been satisfied.
483 */
484int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
485{
486 int rc = 0, found = 0;
487 struct rio_dbell *dbell;
488
489 mutex_lock(&mport->lock);
490 list_for_each_entry(dbell, &mport->dbells, node) {
491 if ((dbell->res->start == start) && (dbell->res->end == end)) {
492 list_del(&dbell->node);
493 found = 1;
494 break;
495 }
496 }
497 mutex_unlock(&mport->lock);
498
499 /* If we can't find an exact match, fail */
500 if (!found) {
501 rc = -EINVAL;
502 goto out;
503 }
504
505 /* Release the doorbell resource */
506 rc = release_resource(dbell->res);
507
508 /* Free the doorbell event */
509 kfree(dbell);
510
511 out:
512 return rc;
513}
514
515/**
516 * rio_request_outb_dbell - request outbound doorbell message range
517 * @rdev: RIO device from which to allocate the doorbell resource
518 * @start: Doorbell message range start
519 * @end: Doorbell message range end
520 *
521 * Requests ownership of a doorbell message range. Returns a resource
522 * if the request has been satisfied or %NULL on failure.
523 */
524struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
525 u16 end)
526{
527 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
528
529 if (res) {
530 rio_init_dbell_res(res, start, end);
531
532 /* Make sure these doorbells aren't in use */
533 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
534 < 0) {
535 kfree(res);
536 res = NULL;
537 }
538 }
539
540 return res;
541}
542
543/**
544 * rio_release_outb_dbell - release outbound doorbell message range
545 * @rdev: RIO device from which to release the doorbell resource
546 * @res: Doorbell resource to be freed
547 *
548 * Releases ownership of a doorbell message range. Returns 0 if the
549 * request has been satisfied.
550 */
551int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
552{
553 int rc = release_resource(res);
554
555 kfree(res);
556
557 return rc;
558}
559
560/**
561 * rio_add_mport_pw_handler - add port-write message handler into the list
562 * of mport specific pw handlers
563 * @mport: RIO master port to bind the portwrite callback
564 * @context: Handler specific context to pass on event
565 * @pwcback: Callback to execute when portwrite is received
566 *
567 * Returns 0 if the request has been satisfied.
568 */
569int rio_add_mport_pw_handler(struct rio_mport *mport, void *context,
570 int (*pwcback)(struct rio_mport *mport,
571 void *context, union rio_pw_msg *msg, int step))
572{
573 int rc = 0;
574 struct rio_pwrite *pwrite;
575
576 pwrite = kzalloc(sizeof(struct rio_pwrite), GFP_KERNEL);
577 if (!pwrite) {
578 rc = -ENOMEM;
579 goto out;
580 }
581
582 pwrite->pwcback = pwcback;
583 pwrite->context = context;
584 mutex_lock(&mport->lock);
585 list_add_tail(&pwrite->node, &mport->pwrites);
586 mutex_unlock(&mport->lock);
587out:
588 return rc;
589}
590EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler);
591
592/**
593 * rio_del_mport_pw_handler - remove port-write message handler from the list
594 * of mport specific pw handlers
595 * @mport: RIO master port to bind the portwrite callback
596 * @context: Registered handler specific context to pass on event
597 * @pwcback: Registered callback function
598 *
599 * Returns 0 if the request has been satisfied.
600 */
601int rio_del_mport_pw_handler(struct rio_mport *mport, void *context,
602 int (*pwcback)(struct rio_mport *mport,
603 void *context, union rio_pw_msg *msg, int step))
604{
605 int rc = -EINVAL;
606 struct rio_pwrite *pwrite;
607
608 mutex_lock(&mport->lock);
609 list_for_each_entry(pwrite, &mport->pwrites, node) {
610 if (pwrite->pwcback == pwcback && pwrite->context == context) {
611 list_del(&pwrite->node);
612 kfree(pwrite);
613 rc = 0;
614 break;
615 }
616 }
617 mutex_unlock(&mport->lock);
618
619 return rc;
620}
621EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler);
622
623/**
624 * rio_request_inb_pwrite - request inbound port-write message service for
625 * specific RapidIO device
626 * @rdev: RIO device to which register inbound port-write callback routine
627 * @pwcback: Callback routine to execute when port-write is received
628 *
629 * Binds a port-write callback function to the RapidIO device.
630 * Returns 0 if the request has been satisfied.
631 */
632int rio_request_inb_pwrite(struct rio_dev *rdev,
633 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
634{
635 int rc = 0;
636
637 spin_lock(&rio_global_list_lock);
638 if (rdev->pwcback != NULL)
639 rc = -ENOMEM;
640 else
641 rdev->pwcback = pwcback;
642
643 spin_unlock(&rio_global_list_lock);
644 return rc;
645}
646EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
647
648/**
649 * rio_release_inb_pwrite - release inbound port-write message service
650 * associated with specific RapidIO device
651 * @rdev: RIO device which registered for inbound port-write callback
652 *
653 * Removes callback from the rio_dev structure. Returns 0 if the request
654 * has been satisfied.
655 */
656int rio_release_inb_pwrite(struct rio_dev *rdev)
657{
658 int rc = -ENOMEM;
659
660 spin_lock(&rio_global_list_lock);
661 if (rdev->pwcback) {
662 rdev->pwcback = NULL;
663 rc = 0;
664 }
665
666 spin_unlock(&rio_global_list_lock);
667 return rc;
668}
669EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
670
671/**
672 * rio_pw_enable - Enables/disables port-write handling by a master port
673 * @mport: Master port associated with port-write handling
674 * @enable: 1=enable, 0=disable
675 */
676void rio_pw_enable(struct rio_mport *mport, int enable)
677{
678 if (mport->ops->pwenable) {
679 mutex_lock(&mport->lock);
680
681 if ((enable && ++mport->pwe_refcnt == 1) ||
682 (!enable && mport->pwe_refcnt && --mport->pwe_refcnt == 0))
683 mport->ops->pwenable(mport, enable);
684 mutex_unlock(&mport->lock);
685 }
686}
687EXPORT_SYMBOL_GPL(rio_pw_enable);
688
689/**
690 * rio_map_inb_region -- Map inbound memory region.
691 * @mport: Master port.
692 * @local: physical address of memory region to be mapped
693 * @rbase: RIO base address assigned to this window
694 * @size: Size of the memory region
695 * @rflags: Flags for mapping.
696 *
697 * Return: 0 -- Success.
698 *
699 * This function will create the mapping from RIO space to local memory.
700 */
701int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
702 u64 rbase, u32 size, u32 rflags)
703{
704 int rc = 0;
705 unsigned long flags;
706
707 if (!mport->ops->map_inb)
708 return -1;
709 spin_lock_irqsave(&rio_mmap_lock, flags);
710 rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
711 spin_unlock_irqrestore(&rio_mmap_lock, flags);
712 return rc;
713}
714EXPORT_SYMBOL_GPL(rio_map_inb_region);
715
716/**
717 * rio_unmap_inb_region -- Unmap the inbound memory region
718 * @mport: Master port
719 * @lstart: physical address of memory region to be unmapped
720 */
721void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
722{
723 unsigned long flags;
724 if (!mport->ops->unmap_inb)
725 return;
726 spin_lock_irqsave(&rio_mmap_lock, flags);
727 mport->ops->unmap_inb(mport, lstart);
728 spin_unlock_irqrestore(&rio_mmap_lock, flags);
729}
730EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
731
732/**
733 * rio_map_outb_region -- Map outbound memory region.
734 * @mport: Master port.
735 * @destid: destination id window points to
736 * @rbase: RIO base address window translates to
737 * @size: Size of the memory region
738 * @rflags: Flags for mapping.
739 * @local: physical address of memory region mapped
740 *
741 * Return: 0 -- Success.
742 *
743 * This function will create the mapping from RIO space to local memory.
744 */
745int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase,
746 u32 size, u32 rflags, dma_addr_t *local)
747{
748 int rc = 0;
749 unsigned long flags;
750
751 if (!mport->ops->map_outb)
752 return -ENODEV;
753
754 spin_lock_irqsave(&rio_mmap_lock, flags);
755 rc = mport->ops->map_outb(mport, destid, rbase, size,
756 rflags, local);
757 spin_unlock_irqrestore(&rio_mmap_lock, flags);
758
759 return rc;
760}
761EXPORT_SYMBOL_GPL(rio_map_outb_region);
762
763/**
764 * rio_unmap_inb_region -- Unmap the inbound memory region
765 * @mport: Master port
766 * @destid: destination id mapping points to
767 * @rstart: RIO base address window translates to
768 */
769void rio_unmap_outb_region(struct rio_mport *mport, u16 destid, u64 rstart)
770{
771 unsigned long flags;
772
773 if (!mport->ops->unmap_outb)
774 return;
775
776 spin_lock_irqsave(&rio_mmap_lock, flags);
777 mport->ops->unmap_outb(mport, destid, rstart);
778 spin_unlock_irqrestore(&rio_mmap_lock, flags);
779}
780EXPORT_SYMBOL_GPL(rio_unmap_outb_region);
781
782/**
783 * rio_mport_get_physefb - Helper function that returns register offset
784 * for Physical Layer Extended Features Block.
785 * @port: Master port to issue transaction
786 * @local: Indicate a local master port or remote device access
787 * @destid: Destination ID of the device
788 * @hopcount: Number of switch hops to the device
789 * @rmap: pointer to location to store register map type info
790 */
791u32
792rio_mport_get_physefb(struct rio_mport *port, int local,
793 u16 destid, u8 hopcount, u32 *rmap)
794{
795 u32 ext_ftr_ptr;
796 u32 ftr_header;
797
798 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
799
800 while (ext_ftr_ptr) {
801 if (local)
802 rio_local_read_config_32(port, ext_ftr_ptr,
803 &ftr_header);
804 else
805 rio_mport_read_config_32(port, destid, hopcount,
806 ext_ftr_ptr, &ftr_header);
807
808 ftr_header = RIO_GET_BLOCK_ID(ftr_header);
809 switch (ftr_header) {
810
811 case RIO_EFB_SER_EP_ID:
812 case RIO_EFB_SER_EP_REC_ID:
813 case RIO_EFB_SER_EP_FREE_ID:
814 case RIO_EFB_SER_EP_M1_ID:
815 case RIO_EFB_SER_EP_SW_M1_ID:
816 case RIO_EFB_SER_EPF_M1_ID:
817 case RIO_EFB_SER_EPF_SW_M1_ID:
818 *rmap = 1;
819 return ext_ftr_ptr;
820
821 case RIO_EFB_SER_EP_M2_ID:
822 case RIO_EFB_SER_EP_SW_M2_ID:
823 case RIO_EFB_SER_EPF_M2_ID:
824 case RIO_EFB_SER_EPF_SW_M2_ID:
825 *rmap = 2;
826 return ext_ftr_ptr;
827
828 default:
829 break;
830 }
831
832 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
833 hopcount, ext_ftr_ptr);
834 }
835
836 return ext_ftr_ptr;
837}
838EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
839
840/**
841 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
842 * @comp_tag: RIO component tag to match
843 * @from: Previous RIO device found in search, or %NULL for new search
844 *
845 * Iterates through the list of known RIO devices. If a RIO device is
846 * found with a matching @comp_tag, a pointer to its device
847 * structure is returned. Otherwise, %NULL is returned. A new search
848 * is initiated by passing %NULL to the @from argument. Otherwise, if
849 * @from is not %NULL, searches continue from next device on the global
850 * list.
851 */
852struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
853{
854 struct list_head *n;
855 struct rio_dev *rdev;
856
857 spin_lock(&rio_global_list_lock);
858 n = from ? from->global_list.next : rio_devices.next;
859
860 while (n && (n != &rio_devices)) {
861 rdev = rio_dev_g(n);
862 if (rdev->comp_tag == comp_tag)
863 goto exit;
864 n = n->next;
865 }
866 rdev = NULL;
867exit:
868 spin_unlock(&rio_global_list_lock);
869 return rdev;
870}
871EXPORT_SYMBOL_GPL(rio_get_comptag);
872
873/**
874 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
875 * @rdev: Pointer to RIO device control structure
876 * @pnum: Switch port number to set LOCKOUT bit
877 * @lock: Operation : set (=1) or clear (=0)
878 */
879int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
880{
881 u32 regval;
882
883 rio_read_config_32(rdev,
884 RIO_DEV_PORT_N_CTL_CSR(rdev, pnum),
885 ®val);
886 if (lock)
887 regval |= RIO_PORT_N_CTL_LOCKOUT;
888 else
889 regval &= ~RIO_PORT_N_CTL_LOCKOUT;
890
891 rio_write_config_32(rdev,
892 RIO_DEV_PORT_N_CTL_CSR(rdev, pnum),
893 regval);
894 return 0;
895}
896EXPORT_SYMBOL_GPL(rio_set_port_lockout);
897
898/**
899 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
900 * given port
901 * @port: Master port associated with the RIO network
902 * @local: local=1 select local port otherwise a far device is reached
903 * @destid: Destination ID of the device to check host bit
904 * @hopcount: Number of hops to reach the target
905 * @port_num: Port (-number on switch) to enable on a far end device
906 *
907 * Returns 0 or 1 from on General Control Command and Status Register
908 * (EXT_PTR+0x3C)
909 */
910int rio_enable_rx_tx_port(struct rio_mport *port,
911 int local, u16 destid,
912 u8 hopcount, u8 port_num)
913{
914#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
915 u32 regval;
916 u32 ext_ftr_ptr;
917 u32 rmap;
918
919 /*
920 * enable rx input tx output port
921 */
922 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
923 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
924
925 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid,
926 hopcount, &rmap);
927
928 if (local) {
929 rio_local_read_config_32(port,
930 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap),
931 ®val);
932 } else {
933 if (rio_mport_read_config_32(port, destid, hopcount,
934 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap),
935 ®val) < 0)
936 return -EIO;
937 }
938
939 regval = regval | RIO_PORT_N_CTL_EN_RX | RIO_PORT_N_CTL_EN_TX;
940
941 if (local) {
942 rio_local_write_config_32(port,
943 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap), regval);
944 } else {
945 if (rio_mport_write_config_32(port, destid, hopcount,
946 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap),
947 regval) < 0)
948 return -EIO;
949 }
950#endif
951 return 0;
952}
953EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
954
955
956/**
957 * rio_chk_dev_route - Validate route to the specified device.
958 * @rdev: RIO device failed to respond
959 * @nrdev: Last active device on the route to rdev
960 * @npnum: nrdev's port number on the route to rdev
961 *
962 * Follows a route to the specified RIO device to determine the last available
963 * device (and corresponding RIO port) on the route.
964 */
965static int
966rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
967{
968 u32 result;
969 int p_port, rc = -EIO;
970 struct rio_dev *prev = NULL;
971
972 /* Find switch with failed RIO link */
973 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
974 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
975 prev = rdev->prev;
976 break;
977 }
978 rdev = rdev->prev;
979 }
980
981 if (prev == NULL)
982 goto err_out;
983
984 p_port = prev->rswitch->route_table[rdev->destid];
985
986 if (p_port != RIO_INVALID_ROUTE) {
987 pr_debug("RIO: link failed on [%s]-P%d\n",
988 rio_name(prev), p_port);
989 *nrdev = prev;
990 *npnum = p_port;
991 rc = 0;
992 } else
993 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
994err_out:
995 return rc;
996}
997
998/**
999 * rio_mport_chk_dev_access - Validate access to the specified device.
1000 * @mport: Master port to send transactions
1001 * @destid: Device destination ID in network
1002 * @hopcount: Number of hops into the network
1003 */
1004int
1005rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
1006{
1007 int i = 0;
1008 u32 tmp;
1009
1010 while (rio_mport_read_config_32(mport, destid, hopcount,
1011 RIO_DEV_ID_CAR, &tmp)) {
1012 i++;
1013 if (i == RIO_MAX_CHK_RETRY)
1014 return -EIO;
1015 mdelay(1);
1016 }
1017
1018 return 0;
1019}
1020EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
1021
1022/**
1023 * rio_chk_dev_access - Validate access to the specified device.
1024 * @rdev: Pointer to RIO device control structure
1025 */
1026static int rio_chk_dev_access(struct rio_dev *rdev)
1027{
1028 return rio_mport_chk_dev_access(rdev->net->hport,
1029 rdev->destid, rdev->hopcount);
1030}
1031
1032/**
1033 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
1034 * returns link-response (if requested).
1035 * @rdev: RIO devive to issue Input-status command
1036 * @pnum: Device port number to issue the command
1037 * @lnkresp: Response from a link partner
1038 */
1039static int
1040rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
1041{
1042 u32 regval;
1043 int checkcount;
1044
1045 if (lnkresp) {
1046 /* Read from link maintenance response register
1047 * to clear valid bit */
1048 rio_read_config_32(rdev,
1049 RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum),
1050 ®val);
1051 udelay(50);
1052 }
1053
1054 /* Issue Input-status command */
1055 rio_write_config_32(rdev,
1056 RIO_DEV_PORT_N_MNT_REQ_CSR(rdev, pnum),
1057 RIO_MNT_REQ_CMD_IS);
1058
1059 /* Exit if the response is not expected */
1060 if (lnkresp == NULL)
1061 return 0;
1062
1063 checkcount = 3;
1064 while (checkcount--) {
1065 udelay(50);
1066 rio_read_config_32(rdev,
1067 RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum),
1068 ®val);
1069 if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
1070 *lnkresp = regval;
1071 return 0;
1072 }
1073 }
1074
1075 return -EIO;
1076}
1077
1078/**
1079 * rio_clr_err_stopped - Clears port Error-stopped states.
1080 * @rdev: Pointer to RIO device control structure
1081 * @pnum: Switch port number to clear errors
1082 * @err_status: port error status (if 0 reads register from device)
1083 *
1084 * TODO: Currently this routine is not compatible with recovery process
1085 * specified for idt_gen3 RapidIO switch devices. It has to be reviewed
1086 * to implement universal recovery process that is compatible full range
1087 * off available devices.
1088 * IDT gen3 switch driver now implements HW-specific error handler that
1089 * issues soft port reset to the port to reset ERR_STOP bits and ackIDs.
1090 */
1091static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
1092{
1093 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
1094 u32 regval;
1095 u32 far_ackid, far_linkstat, near_ackid;
1096
1097 if (err_status == 0)
1098 rio_read_config_32(rdev,
1099 RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
1100 &err_status);
1101
1102 if (err_status & RIO_PORT_N_ERR_STS_OUT_ES) {
1103 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
1104 /*
1105 * Send a Link-Request/Input-Status control symbol
1106 */
1107 if (rio_get_input_status(rdev, pnum, ®val)) {
1108 pr_debug("RIO_EM: Input-status response timeout\n");
1109 goto rd_err;
1110 }
1111
1112 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
1113 pnum, regval);
1114 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
1115 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
1116 rio_read_config_32(rdev,
1117 RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),
1118 ®val);
1119 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
1120 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
1121 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
1122 " near_ackID=0x%02x\n",
1123 pnum, far_ackid, far_linkstat, near_ackid);
1124
1125 /*
1126 * If required, synchronize ackIDs of near and
1127 * far sides.
1128 */
1129 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
1130 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
1131 /* Align near outstanding/outbound ackIDs with
1132 * far inbound.
1133 */
1134 rio_write_config_32(rdev,
1135 RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),
1136 (near_ackid << 24) |
1137 (far_ackid << 8) | far_ackid);
1138 /* Align far outstanding/outbound ackIDs with
1139 * near inbound.
1140 */
1141 far_ackid++;
1142 if (!nextdev) {
1143 pr_debug("RIO_EM: nextdev pointer == NULL\n");
1144 goto rd_err;
1145 }
1146
1147 rio_write_config_32(nextdev,
1148 RIO_DEV_PORT_N_ACK_STS_CSR(nextdev,
1149 RIO_GET_PORT_NUM(nextdev->swpinfo)),
1150 (far_ackid << 24) |
1151 (near_ackid << 8) | near_ackid);
1152 }
1153rd_err:
1154 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
1155 &err_status);
1156 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
1157 }
1158
1159 if ((err_status & RIO_PORT_N_ERR_STS_INP_ES) && nextdev) {
1160 pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
1161 rio_get_input_status(nextdev,
1162 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
1163 udelay(50);
1164
1165 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
1166 &err_status);
1167 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
1168 }
1169
1170 return (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
1171 RIO_PORT_N_ERR_STS_INP_ES)) ? 1 : 0;
1172}
1173
1174/**
1175 * rio_inb_pwrite_handler - inbound port-write message handler
1176 * @mport: mport device associated with port-write
1177 * @pw_msg: pointer to inbound port-write message
1178 *
1179 * Processes an inbound port-write message. Returns 0 if the request
1180 * has been satisfied.
1181 */
1182int rio_inb_pwrite_handler(struct rio_mport *mport, union rio_pw_msg *pw_msg)
1183{
1184 struct rio_dev *rdev;
1185 u32 err_status, em_perrdet, em_ltlerrdet;
1186 int rc, portnum;
1187 struct rio_pwrite *pwrite;
1188
1189#ifdef DEBUG_PW
1190 {
1191 u32 i;
1192
1193 pr_debug("%s: PW to mport_%d:\n", __func__, mport->id);
1194 for (i = 0; i < RIO_PW_MSG_SIZE / sizeof(u32); i = i + 4) {
1195 pr_debug("0x%02x: %08x %08x %08x %08x\n",
1196 i * 4, pw_msg->raw[i], pw_msg->raw[i + 1],
1197 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
1198 }
1199 }
1200#endif
1201
1202 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
1203 if (rdev) {
1204 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
1205 } else {
1206 pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
1207 __func__, pw_msg->em.comptag);
1208 }
1209
1210 /* Call a device-specific handler (if it is registered for the device).
1211 * This may be the service for endpoints that send device-specific
1212 * port-write messages. End-point messages expected to be handled
1213 * completely by EP specific device driver.
1214 * For switches rc==0 signals that no standard processing required.
1215 */
1216 if (rdev && rdev->pwcback) {
1217 rc = rdev->pwcback(rdev, pw_msg, 0);
1218 if (rc == 0)
1219 return 0;
1220 }
1221
1222 mutex_lock(&mport->lock);
1223 list_for_each_entry(pwrite, &mport->pwrites, node)
1224 pwrite->pwcback(mport, pwrite->context, pw_msg, 0);
1225 mutex_unlock(&mport->lock);
1226
1227 if (!rdev)
1228 return 0;
1229
1230 /*
1231 * FIXME: The code below stays as it was before for now until we decide
1232 * how to do default PW handling in combination with per-mport callbacks
1233 */
1234
1235 portnum = pw_msg->em.is_port & 0xFF;
1236
1237 /* Check if device and route to it are functional:
1238 * Sometimes devices may send PW message(s) just before being
1239 * powered down (or link being lost).
1240 */
1241 if (rio_chk_dev_access(rdev)) {
1242 pr_debug("RIO: device access failed - get link partner\n");
1243 /* Scan route to the device and identify failed link.
1244 * This will replace device and port reported in PW message.
1245 * PW message should not be used after this point.
1246 */
1247 if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
1248 pr_err("RIO: Route trace for %s failed\n",
1249 rio_name(rdev));
1250 return -EIO;
1251 }
1252 pw_msg = NULL;
1253 }
1254
1255 /* For End-point devices processing stops here */
1256 if (!(rdev->pef & RIO_PEF_SWITCH))
1257 return 0;
1258
1259 if (rdev->phys_efptr == 0) {
1260 pr_err("RIO_PW: Bad switch initialization for %s\n",
1261 rio_name(rdev));
1262 return 0;
1263 }
1264
1265 /*
1266 * Process the port-write notification from switch
1267 */
1268 if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
1269 rdev->rswitch->ops->em_handle(rdev, portnum);
1270
1271 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
1272 &err_status);
1273 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
1274
1275 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
1276
1277 if (!(rdev->rswitch->port_ok & (1 << portnum))) {
1278 rdev->rswitch->port_ok |= (1 << portnum);
1279 rio_set_port_lockout(rdev, portnum, 0);
1280 /* Schedule Insertion Service */
1281 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
1282 rio_name(rdev), portnum);
1283 }
1284
1285 /* Clear error-stopped states (if reported).
1286 * Depending on the link partner state, two attempts
1287 * may be needed for successful recovery.
1288 */
1289 if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
1290 RIO_PORT_N_ERR_STS_INP_ES)) {
1291 if (rio_clr_err_stopped(rdev, portnum, err_status))
1292 rio_clr_err_stopped(rdev, portnum, 0);
1293 }
1294 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
1295
1296 if (rdev->rswitch->port_ok & (1 << portnum)) {
1297 rdev->rswitch->port_ok &= ~(1 << portnum);
1298 rio_set_port_lockout(rdev, portnum, 1);
1299
1300 if (rdev->phys_rmap == 1) {
1301 rio_write_config_32(rdev,
1302 RIO_DEV_PORT_N_ACK_STS_CSR(rdev, portnum),
1303 RIO_PORT_N_ACK_CLEAR);
1304 } else {
1305 rio_write_config_32(rdev,
1306 RIO_DEV_PORT_N_OB_ACK_CSR(rdev, portnum),
1307 RIO_PORT_N_OB_ACK_CLEAR);
1308 rio_write_config_32(rdev,
1309 RIO_DEV_PORT_N_IB_ACK_CSR(rdev, portnum),
1310 0);
1311 }
1312
1313 /* Schedule Extraction Service */
1314 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
1315 rio_name(rdev), portnum);
1316 }
1317 }
1318
1319 rio_read_config_32(rdev,
1320 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
1321 if (em_perrdet) {
1322 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
1323 portnum, em_perrdet);
1324 /* Clear EM Port N Error Detect CSR */
1325 rio_write_config_32(rdev,
1326 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
1327 }
1328
1329 rio_read_config_32(rdev,
1330 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1331 if (em_ltlerrdet) {
1332 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1333 em_ltlerrdet);
1334 /* Clear EM L/T Layer Error Detect CSR */
1335 rio_write_config_32(rdev,
1336 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1337 }
1338
1339 /* Clear remaining error bits and Port-Write Pending bit */
1340 rio_write_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
1341 err_status);
1342
1343 return 0;
1344}
1345EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1346
1347/**
1348 * rio_mport_get_efb - get pointer to next extended features block
1349 * @port: Master port to issue transaction
1350 * @local: Indicate a local master port or remote device access
1351 * @destid: Destination ID of the device
1352 * @hopcount: Number of switch hops to the device
1353 * @from: Offset of current Extended Feature block header (if 0 starts
1354 * from ExtFeaturePtr)
1355 */
1356u32
1357rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1358 u8 hopcount, u32 from)
1359{
1360 u32 reg_val;
1361
1362 if (from == 0) {
1363 if (local)
1364 rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1365 ®_val);
1366 else
1367 rio_mport_read_config_32(port, destid, hopcount,
1368 RIO_ASM_INFO_CAR, ®_val);
1369 return reg_val & RIO_EXT_FTR_PTR_MASK;
1370 } else {
1371 if (local)
1372 rio_local_read_config_32(port, from, ®_val);
1373 else
1374 rio_mport_read_config_32(port, destid, hopcount,
1375 from, ®_val);
1376 return RIO_GET_BLOCK_ID(reg_val);
1377 }
1378}
1379EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1380
1381/**
1382 * rio_mport_get_feature - query for devices' extended features
1383 * @port: Master port to issue transaction
1384 * @local: Indicate a local master port or remote device access
1385 * @destid: Destination ID of the device
1386 * @hopcount: Number of switch hops to the device
1387 * @ftr: Extended feature code
1388 *
1389 * Tell if a device supports a given RapidIO capability.
1390 * Returns the offset of the requested extended feature
1391 * block within the device's RIO configuration space or
1392 * 0 in case the device does not support it.
1393 */
1394u32
1395rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1396 u8 hopcount, int ftr)
1397{
1398 u32 asm_info, ext_ftr_ptr, ftr_header;
1399
1400 if (local)
1401 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1402 else
1403 rio_mport_read_config_32(port, destid, hopcount,
1404 RIO_ASM_INFO_CAR, &asm_info);
1405
1406 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1407
1408 while (ext_ftr_ptr) {
1409 if (local)
1410 rio_local_read_config_32(port, ext_ftr_ptr,
1411 &ftr_header);
1412 else
1413 rio_mport_read_config_32(port, destid, hopcount,
1414 ext_ftr_ptr, &ftr_header);
1415 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1416 return ext_ftr_ptr;
1417 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1418 break;
1419 }
1420
1421 return 0;
1422}
1423EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1424
1425/**
1426 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1427 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1428 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1429 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1430 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1431 * @from: Previous RIO device found in search, or %NULL for new search
1432 *
1433 * Iterates through the list of known RIO devices. If a RIO device is
1434 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1435 * count to the device is incrememted and a pointer to its device
1436 * structure is returned. Otherwise, %NULL is returned. A new search
1437 * is initiated by passing %NULL to the @from argument. Otherwise, if
1438 * @from is not %NULL, searches continue from next device on the global
1439 * list. The reference count for @from is always decremented if it is
1440 * not %NULL.
1441 */
1442struct rio_dev *rio_get_asm(u16 vid, u16 did,
1443 u16 asm_vid, u16 asm_did, struct rio_dev *from)
1444{
1445 struct list_head *n;
1446 struct rio_dev *rdev;
1447
1448 WARN_ON(in_interrupt());
1449 spin_lock(&rio_global_list_lock);
1450 n = from ? from->global_list.next : rio_devices.next;
1451
1452 while (n && (n != &rio_devices)) {
1453 rdev = rio_dev_g(n);
1454 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1455 (did == RIO_ANY_ID || rdev->did == did) &&
1456 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1457 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1458 goto exit;
1459 n = n->next;
1460 }
1461 rdev = NULL;
1462 exit:
1463 rio_dev_put(from);
1464 rdev = rio_dev_get(rdev);
1465 spin_unlock(&rio_global_list_lock);
1466 return rdev;
1467}
1468
1469/**
1470 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1471 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1472 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1473 * @from: Previous RIO device found in search, or %NULL for new search
1474 *
1475 * Iterates through the list of known RIO devices. If a RIO device is
1476 * found with a matching @vid and @did, the reference count to the
1477 * device is incrememted and a pointer to its device structure is returned.
1478 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1479 * to the @from argument. Otherwise, if @from is not %NULL, searches
1480 * continue from next device on the global list. The reference count for
1481 * @from is always decremented if it is not %NULL.
1482 */
1483struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1484{
1485 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1486}
1487
1488/**
1489 * rio_std_route_add_entry - Add switch route table entry using standard
1490 * registers defined in RIO specification rev.1.3
1491 * @mport: Master port to issue transaction
1492 * @destid: Destination ID of the device
1493 * @hopcount: Number of switch hops to the device
1494 * @table: routing table ID (global or port-specific)
1495 * @route_destid: destID entry in the RT
1496 * @route_port: destination port for specified destID
1497 */
1498static int
1499rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1500 u16 table, u16 route_destid, u8 route_port)
1501{
1502 if (table == RIO_GLOBAL_TABLE) {
1503 rio_mport_write_config_32(mport, destid, hopcount,
1504 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1505 (u32)route_destid);
1506 rio_mport_write_config_32(mport, destid, hopcount,
1507 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1508 (u32)route_port);
1509 }
1510
1511 udelay(10);
1512 return 0;
1513}
1514
1515/**
1516 * rio_std_route_get_entry - Read switch route table entry (port number)
1517 * associated with specified destID using standard registers defined in RIO
1518 * specification rev.1.3
1519 * @mport: Master port to issue transaction
1520 * @destid: Destination ID of the device
1521 * @hopcount: Number of switch hops to the device
1522 * @table: routing table ID (global or port-specific)
1523 * @route_destid: destID entry in the RT
1524 * @route_port: returned destination port for specified destID
1525 */
1526static int
1527rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1528 u16 table, u16 route_destid, u8 *route_port)
1529{
1530 u32 result;
1531
1532 if (table == RIO_GLOBAL_TABLE) {
1533 rio_mport_write_config_32(mport, destid, hopcount,
1534 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1535 rio_mport_read_config_32(mport, destid, hopcount,
1536 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1537
1538 *route_port = (u8)result;
1539 }
1540
1541 return 0;
1542}
1543
1544/**
1545 * rio_std_route_clr_table - Clear swotch route table using standard registers
1546 * defined in RIO specification rev.1.3.
1547 * @mport: Master port to issue transaction
1548 * @destid: Destination ID of the device
1549 * @hopcount: Number of switch hops to the device
1550 * @table: routing table ID (global or port-specific)
1551 */
1552static int
1553rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1554 u16 table)
1555{
1556 u32 max_destid = 0xff;
1557 u32 i, pef, id_inc = 1, ext_cfg = 0;
1558 u32 port_sel = RIO_INVALID_ROUTE;
1559
1560 if (table == RIO_GLOBAL_TABLE) {
1561 rio_mport_read_config_32(mport, destid, hopcount,
1562 RIO_PEF_CAR, &pef);
1563
1564 if (mport->sys_size) {
1565 rio_mport_read_config_32(mport, destid, hopcount,
1566 RIO_SWITCH_RT_LIMIT,
1567 &max_destid);
1568 max_destid &= RIO_RT_MAX_DESTID;
1569 }
1570
1571 if (pef & RIO_PEF_EXT_RT) {
1572 ext_cfg = 0x80000000;
1573 id_inc = 4;
1574 port_sel = (RIO_INVALID_ROUTE << 24) |
1575 (RIO_INVALID_ROUTE << 16) |
1576 (RIO_INVALID_ROUTE << 8) |
1577 RIO_INVALID_ROUTE;
1578 }
1579
1580 for (i = 0; i <= max_destid;) {
1581 rio_mport_write_config_32(mport, destid, hopcount,
1582 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1583 ext_cfg | i);
1584 rio_mport_write_config_32(mport, destid, hopcount,
1585 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1586 port_sel);
1587 i += id_inc;
1588 }
1589 }
1590
1591 udelay(10);
1592 return 0;
1593}
1594
1595/**
1596 * rio_lock_device - Acquires host device lock for specified device
1597 * @port: Master port to send transaction
1598 * @destid: Destination ID for device/switch
1599 * @hopcount: Hopcount to reach switch
1600 * @wait_ms: Max wait time in msec (0 = no timeout)
1601 *
1602 * Attepts to acquire host device lock for specified device
1603 * Returns 0 if device lock acquired or EINVAL if timeout expires.
1604 */
1605int rio_lock_device(struct rio_mport *port, u16 destid,
1606 u8 hopcount, int wait_ms)
1607{
1608 u32 result;
1609 int tcnt = 0;
1610
1611 /* Attempt to acquire device lock */
1612 rio_mport_write_config_32(port, destid, hopcount,
1613 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
1614 rio_mport_read_config_32(port, destid, hopcount,
1615 RIO_HOST_DID_LOCK_CSR, &result);
1616
1617 while (result != port->host_deviceid) {
1618 if (wait_ms != 0 && tcnt == wait_ms) {
1619 pr_debug("RIO: timeout when locking device %x:%x\n",
1620 destid, hopcount);
1621 return -EINVAL;
1622 }
1623
1624 /* Delay a bit */
1625 mdelay(1);
1626 tcnt++;
1627 /* Try to acquire device lock again */
1628 rio_mport_write_config_32(port, destid,
1629 hopcount,
1630 RIO_HOST_DID_LOCK_CSR,
1631 port->host_deviceid);
1632 rio_mport_read_config_32(port, destid,
1633 hopcount,
1634 RIO_HOST_DID_LOCK_CSR, &result);
1635 }
1636
1637 return 0;
1638}
1639EXPORT_SYMBOL_GPL(rio_lock_device);
1640
1641/**
1642 * rio_unlock_device - Releases host device lock for specified device
1643 * @port: Master port to send transaction
1644 * @destid: Destination ID for device/switch
1645 * @hopcount: Hopcount to reach switch
1646 *
1647 * Returns 0 if device lock released or EINVAL if fails.
1648 */
1649int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
1650{
1651 u32 result;
1652
1653 /* Release device lock */
1654 rio_mport_write_config_32(port, destid,
1655 hopcount,
1656 RIO_HOST_DID_LOCK_CSR,
1657 port->host_deviceid);
1658 rio_mport_read_config_32(port, destid, hopcount,
1659 RIO_HOST_DID_LOCK_CSR, &result);
1660 if ((result & 0xffff) != 0xffff) {
1661 pr_debug("RIO: badness when releasing device lock %x:%x\n",
1662 destid, hopcount);
1663 return -EINVAL;
1664 }
1665
1666 return 0;
1667}
1668EXPORT_SYMBOL_GPL(rio_unlock_device);
1669
1670/**
1671 * rio_route_add_entry- Add a route entry to a switch routing table
1672 * @rdev: RIO device
1673 * @table: Routing table ID
1674 * @route_destid: Destination ID to be routed
1675 * @route_port: Port number to be routed
1676 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1677 *
1678 * If available calls the switch specific add_entry() method to add a route
1679 * entry into a switch routing table. Otherwise uses standard RT update method
1680 * as defined by RapidIO specification. A specific routing table can be selected
1681 * using the @table argument if a switch has per port routing tables or
1682 * the standard (or global) table may be used by passing
1683 * %RIO_GLOBAL_TABLE in @table.
1684 *
1685 * Returns %0 on success or %-EINVAL on failure.
1686 */
1687int rio_route_add_entry(struct rio_dev *rdev,
1688 u16 table, u16 route_destid, u8 route_port, int lock)
1689{
1690 int rc = -EINVAL;
1691 struct rio_switch_ops *ops = rdev->rswitch->ops;
1692
1693 if (lock) {
1694 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1695 rdev->hopcount, 1000);
1696 if (rc)
1697 return rc;
1698 }
1699
1700 spin_lock(&rdev->rswitch->lock);
1701
1702 if (ops == NULL || ops->add_entry == NULL) {
1703 rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
1704 rdev->hopcount, table,
1705 route_destid, route_port);
1706 } else if (try_module_get(ops->owner)) {
1707 rc = ops->add_entry(rdev->net->hport, rdev->destid,
1708 rdev->hopcount, table, route_destid,
1709 route_port);
1710 module_put(ops->owner);
1711 }
1712
1713 spin_unlock(&rdev->rswitch->lock);
1714
1715 if (lock)
1716 rio_unlock_device(rdev->net->hport, rdev->destid,
1717 rdev->hopcount);
1718
1719 return rc;
1720}
1721EXPORT_SYMBOL_GPL(rio_route_add_entry);
1722
1723/**
1724 * rio_route_get_entry- Read an entry from a switch routing table
1725 * @rdev: RIO device
1726 * @table: Routing table ID
1727 * @route_destid: Destination ID to be routed
1728 * @route_port: Pointer to read port number into
1729 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1730 *
1731 * If available calls the switch specific get_entry() method to fetch a route
1732 * entry from a switch routing table. Otherwise uses standard RT read method
1733 * as defined by RapidIO specification. A specific routing table can be selected
1734 * using the @table argument if a switch has per port routing tables or
1735 * the standard (or global) table may be used by passing
1736 * %RIO_GLOBAL_TABLE in @table.
1737 *
1738 * Returns %0 on success or %-EINVAL on failure.
1739 */
1740int rio_route_get_entry(struct rio_dev *rdev, u16 table,
1741 u16 route_destid, u8 *route_port, int lock)
1742{
1743 int rc = -EINVAL;
1744 struct rio_switch_ops *ops = rdev->rswitch->ops;
1745
1746 if (lock) {
1747 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1748 rdev->hopcount, 1000);
1749 if (rc)
1750 return rc;
1751 }
1752
1753 spin_lock(&rdev->rswitch->lock);
1754
1755 if (ops == NULL || ops->get_entry == NULL) {
1756 rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
1757 rdev->hopcount, table,
1758 route_destid, route_port);
1759 } else if (try_module_get(ops->owner)) {
1760 rc = ops->get_entry(rdev->net->hport, rdev->destid,
1761 rdev->hopcount, table, route_destid,
1762 route_port);
1763 module_put(ops->owner);
1764 }
1765
1766 spin_unlock(&rdev->rswitch->lock);
1767
1768 if (lock)
1769 rio_unlock_device(rdev->net->hport, rdev->destid,
1770 rdev->hopcount);
1771 return rc;
1772}
1773EXPORT_SYMBOL_GPL(rio_route_get_entry);
1774
1775/**
1776 * rio_route_clr_table - Clear a switch routing table
1777 * @rdev: RIO device
1778 * @table: Routing table ID
1779 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1780 *
1781 * If available calls the switch specific clr_table() method to clear a switch
1782 * routing table. Otherwise uses standard RT write method as defined by RapidIO
1783 * specification. A specific routing table can be selected using the @table
1784 * argument if a switch has per port routing tables or the standard (or global)
1785 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
1786 *
1787 * Returns %0 on success or %-EINVAL on failure.
1788 */
1789int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
1790{
1791 int rc = -EINVAL;
1792 struct rio_switch_ops *ops = rdev->rswitch->ops;
1793
1794 if (lock) {
1795 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1796 rdev->hopcount, 1000);
1797 if (rc)
1798 return rc;
1799 }
1800
1801 spin_lock(&rdev->rswitch->lock);
1802
1803 if (ops == NULL || ops->clr_table == NULL) {
1804 rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
1805 rdev->hopcount, table);
1806 } else if (try_module_get(ops->owner)) {
1807 rc = ops->clr_table(rdev->net->hport, rdev->destid,
1808 rdev->hopcount, table);
1809
1810 module_put(ops->owner);
1811 }
1812
1813 spin_unlock(&rdev->rswitch->lock);
1814
1815 if (lock)
1816 rio_unlock_device(rdev->net->hport, rdev->destid,
1817 rdev->hopcount);
1818
1819 return rc;
1820}
1821EXPORT_SYMBOL_GPL(rio_route_clr_table);
1822
1823#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1824
1825static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1826{
1827 struct rio_mport *mport = arg;
1828
1829 /* Check that DMA device belongs to the right MPORT */
1830 return mport == container_of(chan->device, struct rio_mport, dma);
1831}
1832
1833/**
1834 * rio_request_mport_dma - request RapidIO capable DMA channel associated
1835 * with specified local RapidIO mport device.
1836 * @mport: RIO mport to perform DMA data transfers
1837 *
1838 * Returns pointer to allocated DMA channel or NULL if failed.
1839 */
1840struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
1841{
1842 dma_cap_mask_t mask;
1843
1844 dma_cap_zero(mask);
1845 dma_cap_set(DMA_SLAVE, mask);
1846 return dma_request_channel(mask, rio_chan_filter, mport);
1847}
1848EXPORT_SYMBOL_GPL(rio_request_mport_dma);
1849
1850/**
1851 * rio_request_dma - request RapidIO capable DMA channel that supports
1852 * specified target RapidIO device.
1853 * @rdev: RIO device associated with DMA transfer
1854 *
1855 * Returns pointer to allocated DMA channel or NULL if failed.
1856 */
1857struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1858{
1859 return rio_request_mport_dma(rdev->net->hport);
1860}
1861EXPORT_SYMBOL_GPL(rio_request_dma);
1862
1863/**
1864 * rio_release_dma - release specified DMA channel
1865 * @dchan: DMA channel to release
1866 */
1867void rio_release_dma(struct dma_chan *dchan)
1868{
1869 dma_release_channel(dchan);
1870}
1871EXPORT_SYMBOL_GPL(rio_release_dma);
1872
1873/**
1874 * rio_dma_prep_xfer - RapidIO specific wrapper
1875 * for device_prep_slave_sg callback defined by DMAENGINE.
1876 * @dchan: DMA channel to configure
1877 * @destid: target RapidIO device destination ID
1878 * @data: RIO specific data descriptor
1879 * @direction: DMA data transfer direction (TO or FROM the device)
1880 * @flags: dmaengine defined flags
1881 *
1882 * Initializes RapidIO capable DMA channel for the specified data transfer.
1883 * Uses DMA channel private extension to pass information related to remote
1884 * target RIO device.
1885 *
1886 * Returns: pointer to DMA transaction descriptor if successful,
1887 * error-valued pointer or NULL if failed.
1888 */
1889struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
1890 u16 destid, struct rio_dma_data *data,
1891 enum dma_transfer_direction direction, unsigned long flags)
1892{
1893 struct rio_dma_ext rio_ext;
1894
1895 if (dchan->device->device_prep_slave_sg == NULL) {
1896 pr_err("%s: prep_rio_sg == NULL\n", __func__);
1897 return NULL;
1898 }
1899
1900 rio_ext.destid = destid;
1901 rio_ext.rio_addr_u = data->rio_addr_u;
1902 rio_ext.rio_addr = data->rio_addr;
1903 rio_ext.wr_type = data->wr_type;
1904
1905 return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1906 direction, flags, &rio_ext);
1907}
1908EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
1909
1910/**
1911 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1912 * for device_prep_slave_sg callback defined by DMAENGINE.
1913 * @rdev: RIO device control structure
1914 * @dchan: DMA channel to configure
1915 * @data: RIO specific data descriptor
1916 * @direction: DMA data transfer direction (TO or FROM the device)
1917 * @flags: dmaengine defined flags
1918 *
1919 * Initializes RapidIO capable DMA channel for the specified data transfer.
1920 * Uses DMA channel private extension to pass information related to remote
1921 * target RIO device.
1922 *
1923 * Returns: pointer to DMA transaction descriptor if successful,
1924 * error-valued pointer or NULL if failed.
1925 */
1926struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1927 struct dma_chan *dchan, struct rio_dma_data *data,
1928 enum dma_transfer_direction direction, unsigned long flags)
1929{
1930 return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);
1931}
1932EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1933
1934#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1935
1936/**
1937 * rio_find_mport - find RIO mport by its ID
1938 * @mport_id: number (ID) of mport device
1939 *
1940 * Given a RIO mport number, the desired mport is located
1941 * in the global list of mports. If the mport is found, a pointer to its
1942 * data structure is returned. If no mport is found, %NULL is returned.
1943 */
1944struct rio_mport *rio_find_mport(int mport_id)
1945{
1946 struct rio_mport *port;
1947
1948 mutex_lock(&rio_mport_list_lock);
1949 list_for_each_entry(port, &rio_mports, node) {
1950 if (port->id == mport_id)
1951 goto found;
1952 }
1953 port = NULL;
1954found:
1955 mutex_unlock(&rio_mport_list_lock);
1956
1957 return port;
1958}
1959
1960/**
1961 * rio_register_scan - enumeration/discovery method registration interface
1962 * @mport_id: mport device ID for which fabric scan routine has to be set
1963 * (RIO_MPORT_ANY = set for all available mports)
1964 * @scan_ops: enumeration/discovery operations structure
1965 *
1966 * Registers enumeration/discovery operations with RapidIO subsystem and
1967 * attaches it to the specified mport device (or all available mports
1968 * if RIO_MPORT_ANY is specified).
1969 *
1970 * Returns error if the mport already has an enumerator attached to it.
1971 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1972 */
1973int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1974{
1975 struct rio_mport *port;
1976 struct rio_scan_node *scan;
1977 int rc = 0;
1978
1979 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1980
1981 if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
1982 !scan_ops)
1983 return -EINVAL;
1984
1985 mutex_lock(&rio_mport_list_lock);
1986
1987 /*
1988 * Check if there is another enumerator already registered for
1989 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
1990 * for the same mport ID are not supported.
1991 */
1992 list_for_each_entry(scan, &rio_scans, node) {
1993 if (scan->mport_id == mport_id) {
1994 rc = -EBUSY;
1995 goto err_out;
1996 }
1997 }
1998
1999 /*
2000 * Allocate and initialize new scan registration node.
2001 */
2002 scan = kzalloc(sizeof(*scan), GFP_KERNEL);
2003 if (!scan) {
2004 rc = -ENOMEM;
2005 goto err_out;
2006 }
2007
2008 scan->mport_id = mport_id;
2009 scan->ops = scan_ops;
2010
2011 /*
2012 * Traverse the list of registered mports to attach this new scan.
2013 *
2014 * The new scan with matching mport ID overrides any previously attached
2015 * scan assuming that old scan (if any) is the default one (based on the
2016 * enumerator registration check above).
2017 * If the new scan is the global one, it will be attached only to mports
2018 * that do not have their own individual operations already attached.
2019 */
2020 list_for_each_entry(port, &rio_mports, node) {
2021 if (port->id == mport_id) {
2022 port->nscan = scan_ops;
2023 break;
2024 } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
2025 port->nscan = scan_ops;
2026 }
2027
2028 list_add_tail(&scan->node, &rio_scans);
2029
2030err_out:
2031 mutex_unlock(&rio_mport_list_lock);
2032
2033 return rc;
2034}
2035EXPORT_SYMBOL_GPL(rio_register_scan);
2036
2037/**
2038 * rio_unregister_scan - removes enumeration/discovery method from mport
2039 * @mport_id: mport device ID for which fabric scan routine has to be
2040 * unregistered (RIO_MPORT_ANY = apply to all mports that use
2041 * the specified scan_ops)
2042 * @scan_ops: enumeration/discovery operations structure
2043 *
2044 * Removes enumeration or discovery method assigned to the specified mport
2045 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
2046 * all mports that have them attached.
2047 */
2048int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
2049{
2050 struct rio_mport *port;
2051 struct rio_scan_node *scan;
2052
2053 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
2054
2055 if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
2056 return -EINVAL;
2057
2058 mutex_lock(&rio_mport_list_lock);
2059
2060 list_for_each_entry(port, &rio_mports, node)
2061 if (port->id == mport_id ||
2062 (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
2063 port->nscan = NULL;
2064
2065 list_for_each_entry(scan, &rio_scans, node) {
2066 if (scan->mport_id == mport_id) {
2067 list_del(&scan->node);
2068 kfree(scan);
2069 break;
2070 }
2071 }
2072
2073 mutex_unlock(&rio_mport_list_lock);
2074
2075 return 0;
2076}
2077EXPORT_SYMBOL_GPL(rio_unregister_scan);
2078
2079/**
2080 * rio_mport_scan - execute enumeration/discovery on the specified mport
2081 * @mport_id: number (ID) of mport device
2082 */
2083int rio_mport_scan(int mport_id)
2084{
2085 struct rio_mport *port = NULL;
2086 int rc;
2087
2088 mutex_lock(&rio_mport_list_lock);
2089 list_for_each_entry(port, &rio_mports, node) {
2090 if (port->id == mport_id)
2091 goto found;
2092 }
2093 mutex_unlock(&rio_mport_list_lock);
2094 return -ENODEV;
2095found:
2096 if (!port->nscan) {
2097 mutex_unlock(&rio_mport_list_lock);
2098 return -EINVAL;
2099 }
2100
2101 if (!try_module_get(port->nscan->owner)) {
2102 mutex_unlock(&rio_mport_list_lock);
2103 return -ENODEV;
2104 }
2105
2106 mutex_unlock(&rio_mport_list_lock);
2107
2108 if (port->host_deviceid >= 0)
2109 rc = port->nscan->enumerate(port, 0);
2110 else
2111 rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
2112
2113 module_put(port->nscan->owner);
2114 return rc;
2115}
2116
2117static void rio_fixup_device(struct rio_dev *dev)
2118{
2119}
2120
2121static int rio_init(void)
2122{
2123 struct rio_dev *dev = NULL;
2124
2125 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
2126 rio_fixup_device(dev);
2127 }
2128 return 0;
2129}
2130
2131static struct workqueue_struct *rio_wq;
2132
2133struct rio_disc_work {
2134 struct work_struct work;
2135 struct rio_mport *mport;
2136};
2137
2138static void disc_work_handler(struct work_struct *_work)
2139{
2140 struct rio_disc_work *work;
2141
2142 work = container_of(_work, struct rio_disc_work, work);
2143 pr_debug("RIO: discovery work for mport %d %s\n",
2144 work->mport->id, work->mport->name);
2145 if (try_module_get(work->mport->nscan->owner)) {
2146 work->mport->nscan->discover(work->mport, 0);
2147 module_put(work->mport->nscan->owner);
2148 }
2149}
2150
2151int rio_init_mports(void)
2152{
2153 struct rio_mport *port;
2154 struct rio_disc_work *work;
2155 int n = 0;
2156
2157 if (!next_portid)
2158 return -ENODEV;
2159
2160 /*
2161 * First, run enumerations and check if we need to perform discovery
2162 * on any of the registered mports.
2163 */
2164 mutex_lock(&rio_mport_list_lock);
2165 list_for_each_entry(port, &rio_mports, node) {
2166 if (port->host_deviceid >= 0) {
2167 if (port->nscan && try_module_get(port->nscan->owner)) {
2168 port->nscan->enumerate(port, 0);
2169 module_put(port->nscan->owner);
2170 }
2171 } else
2172 n++;
2173 }
2174 mutex_unlock(&rio_mport_list_lock);
2175
2176 if (!n)
2177 goto no_disc;
2178
2179 /*
2180 * If we have mports that require discovery schedule a discovery work
2181 * for each of them. If the code below fails to allocate needed
2182 * resources, exit without error to keep results of enumeration
2183 * process (if any).
2184 * TODO: Implement restart of discovery process for all or
2185 * individual discovering mports.
2186 */
2187 rio_wq = alloc_workqueue("riodisc", 0, 0);
2188 if (!rio_wq) {
2189 pr_err("RIO: unable allocate rio_wq\n");
2190 goto no_disc;
2191 }
2192
2193 work = kcalloc(n, sizeof *work, GFP_KERNEL);
2194 if (!work) {
2195 pr_err("RIO: no memory for work struct\n");
2196 destroy_workqueue(rio_wq);
2197 goto no_disc;
2198 }
2199
2200 n = 0;
2201 mutex_lock(&rio_mport_list_lock);
2202 list_for_each_entry(port, &rio_mports, node) {
2203 if (port->host_deviceid < 0 && port->nscan) {
2204 work[n].mport = port;
2205 INIT_WORK(&work[n].work, disc_work_handler);
2206 queue_work(rio_wq, &work[n].work);
2207 n++;
2208 }
2209 }
2210
2211 flush_workqueue(rio_wq);
2212 mutex_unlock(&rio_mport_list_lock);
2213 pr_debug("RIO: destroy discovery workqueue\n");
2214 destroy_workqueue(rio_wq);
2215 kfree(work);
2216
2217no_disc:
2218 rio_init();
2219
2220 return 0;
2221}
2222
2223static int rio_get_hdid(int index)
2224{
2225 if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
2226 return -1;
2227
2228 return hdid[index];
2229}
2230
2231int rio_mport_initialize(struct rio_mport *mport)
2232{
2233 if (next_portid >= RIO_MAX_MPORTS) {
2234 pr_err("RIO: reached specified max number of mports\n");
2235 return -ENODEV;
2236 }
2237
2238 atomic_set(&mport->state, RIO_DEVICE_INITIALIZING);
2239 mport->id = next_portid++;
2240 mport->host_deviceid = rio_get_hdid(mport->id);
2241 mport->nscan = NULL;
2242 mutex_init(&mport->lock);
2243 mport->pwe_refcnt = 0;
2244 INIT_LIST_HEAD(&mport->pwrites);
2245
2246 return 0;
2247}
2248EXPORT_SYMBOL_GPL(rio_mport_initialize);
2249
2250int rio_register_mport(struct rio_mport *port)
2251{
2252 struct rio_scan_node *scan = NULL;
2253 int res = 0;
2254
2255 mutex_lock(&rio_mport_list_lock);
2256
2257 /*
2258 * Check if there are any registered enumeration/discovery operations
2259 * that have to be attached to the added mport.
2260 */
2261 list_for_each_entry(scan, &rio_scans, node) {
2262 if (port->id == scan->mport_id ||
2263 scan->mport_id == RIO_MPORT_ANY) {
2264 port->nscan = scan->ops;
2265 if (port->id == scan->mport_id)
2266 break;
2267 }
2268 }
2269
2270 list_add_tail(&port->node, &rio_mports);
2271 mutex_unlock(&rio_mport_list_lock);
2272
2273 dev_set_name(&port->dev, "rapidio%d", port->id);
2274 port->dev.class = &rio_mport_class;
2275 atomic_set(&port->state, RIO_DEVICE_RUNNING);
2276
2277 res = device_register(&port->dev);
2278 if (res)
2279 dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
2280 port->id, res);
2281 else
2282 dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);
2283
2284 return res;
2285}
2286EXPORT_SYMBOL_GPL(rio_register_mport);
2287
2288static int rio_mport_cleanup_callback(struct device *dev, void *data)
2289{
2290 struct rio_dev *rdev = to_rio_dev(dev);
2291
2292 if (dev->bus == &rio_bus_type)
2293 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
2294 return 0;
2295}
2296
2297static int rio_net_remove_children(struct rio_net *net)
2298{
2299 /*
2300 * Unregister all RapidIO devices residing on this net (this will
2301 * invoke notification of registered subsystem interfaces as well).
2302 */
2303 device_for_each_child(&net->dev, NULL, rio_mport_cleanup_callback);
2304 return 0;
2305}
2306
2307int rio_unregister_mport(struct rio_mport *port)
2308{
2309 pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
2310
2311 /* Transition mport to the SHUTDOWN state */
2312 if (atomic_cmpxchg(&port->state,
2313 RIO_DEVICE_RUNNING,
2314 RIO_DEVICE_SHUTDOWN) != RIO_DEVICE_RUNNING) {
2315 pr_err("RIO: %s unexpected state transition for mport %s\n",
2316 __func__, port->name);
2317 }
2318
2319 if (port->net && port->net->hport == port) {
2320 rio_net_remove_children(port->net);
2321 rio_free_net(port->net);
2322 }
2323
2324 /*
2325 * Unregister all RapidIO devices attached to this mport (this will
2326 * invoke notification of registered subsystem interfaces as well).
2327 */
2328 mutex_lock(&rio_mport_list_lock);
2329 list_del(&port->node);
2330 mutex_unlock(&rio_mport_list_lock);
2331 device_unregister(&port->dev);
2332
2333 return 0;
2334}
2335EXPORT_SYMBOL_GPL(rio_unregister_mport);
2336
2337EXPORT_SYMBOL_GPL(rio_local_get_device_id);
2338EXPORT_SYMBOL_GPL(rio_get_device);
2339EXPORT_SYMBOL_GPL(rio_get_asm);
2340EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
2341EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
2342EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
2343EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
2344EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
2345EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
2346EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
2347EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
2348EXPORT_SYMBOL_GPL(rio_init_mports);