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Matt Porter394b7012005-11-07 01:00:15 -08001/*
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 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
Matt Porter394b7012005-11-07 01:00:15 -080014#include <linux/types.h>
15#include <linux/kernel.h>
16
17#include <linux/delay.h>
18#include <linux/init.h>
19#include <linux/rio.h>
20#include <linux/rio_drv.h>
21#include <linux/rio_ids.h>
22#include <linux/rio_regs.h>
23#include <linux/module.h>
24#include <linux/spinlock.h>
Tim Schmielaude259682006-01-08 01:02:05 -080025#include <linux/slab.h>
Kumar Gala5febf1c2008-01-23 05:53:47 -060026#include <linux/interrupt.h>
Matt Porter394b7012005-11-07 01:00:15 -080027
28#include "rio.h"
29
30static LIST_HEAD(rio_mports);
31
32/**
33 * rio_local_get_device_id - Get the base/extended device id for a port
34 * @port: RIO master port from which to get the deviceid
35 *
36 * Reads the base/extended device id from the local device
37 * implementing the master port. Returns the 8/16-bit device
38 * id.
39 */
40u16 rio_local_get_device_id(struct rio_mport *port)
41{
42 u32 result;
43
44 rio_local_read_config_32(port, RIO_DID_CSR, &result);
45
46 return (RIO_GET_DID(result));
47}
48
49/**
50 * rio_request_inb_mbox - request inbound mailbox service
51 * @mport: RIO master port from which to allocate the mailbox resource
Matt Porter6978bbc2005-11-07 01:00:20 -080052 * @dev_id: Device specific pointer to pass on event
Matt Porter394b7012005-11-07 01:00:15 -080053 * @mbox: Mailbox number to claim
54 * @entries: Number of entries in inbound mailbox queue
55 * @minb: Callback to execute when inbound message is received
56 *
57 * Requests ownership of an inbound mailbox resource and binds
58 * a callback function to the resource. Returns %0 on success.
59 */
60int rio_request_inb_mbox(struct rio_mport *mport,
Matt Porter6978bbc2005-11-07 01:00:20 -080061 void *dev_id,
Matt Porter394b7012005-11-07 01:00:15 -080062 int mbox,
63 int entries,
Matt Porter6978bbc2005-11-07 01:00:20 -080064 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
Matt Porter394b7012005-11-07 01:00:15 -080065 int slot))
66{
67 int rc = 0;
68
69 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
70
71 if (res) {
72 rio_init_mbox_res(res, mbox, mbox);
73
74 /* Make sure this mailbox isn't in use */
75 if ((rc =
76 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
77 res)) < 0) {
78 kfree(res);
79 goto out;
80 }
81
82 mport->inb_msg[mbox].res = res;
83
84 /* Hook the inbound message callback */
85 mport->inb_msg[mbox].mcback = minb;
86
Matt Porter6978bbc2005-11-07 01:00:20 -080087 rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
Matt Porter394b7012005-11-07 01:00:15 -080088 } else
89 rc = -ENOMEM;
90
91 out:
92 return rc;
93}
94
95/**
96 * rio_release_inb_mbox - release inbound mailbox message service
97 * @mport: RIO master port from which to release the mailbox resource
98 * @mbox: Mailbox number to release
99 *
100 * Releases ownership of an inbound mailbox resource. Returns 0
101 * if the request has been satisfied.
102 */
103int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
104{
105 rio_close_inb_mbox(mport, mbox);
106
107 /* Release the mailbox resource */
108 return release_resource(mport->inb_msg[mbox].res);
109}
110
111/**
112 * rio_request_outb_mbox - request outbound mailbox service
113 * @mport: RIO master port from which to allocate the mailbox resource
Matt Porter6978bbc2005-11-07 01:00:20 -0800114 * @dev_id: Device specific pointer to pass on event
Matt Porter394b7012005-11-07 01:00:15 -0800115 * @mbox: Mailbox number to claim
116 * @entries: Number of entries in outbound mailbox queue
117 * @moutb: Callback to execute when outbound message is sent
118 *
119 * Requests ownership of an outbound mailbox resource and binds
120 * a callback function to the resource. Returns 0 on success.
121 */
122int rio_request_outb_mbox(struct rio_mport *mport,
Matt Porter6978bbc2005-11-07 01:00:20 -0800123 void *dev_id,
Matt Porter394b7012005-11-07 01:00:15 -0800124 int mbox,
125 int entries,
Matt Porter6978bbc2005-11-07 01:00:20 -0800126 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
Matt Porter394b7012005-11-07 01:00:15 -0800127{
128 int rc = 0;
129
130 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
131
132 if (res) {
133 rio_init_mbox_res(res, mbox, mbox);
134
135 /* Make sure this outbound mailbox isn't in use */
136 if ((rc =
137 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
138 res)) < 0) {
139 kfree(res);
140 goto out;
141 }
142
143 mport->outb_msg[mbox].res = res;
144
145 /* Hook the inbound message callback */
146 mport->outb_msg[mbox].mcback = moutb;
147
Matt Porter6978bbc2005-11-07 01:00:20 -0800148 rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
Matt Porter394b7012005-11-07 01:00:15 -0800149 } else
150 rc = -ENOMEM;
151
152 out:
153 return rc;
154}
155
156/**
157 * rio_release_outb_mbox - release outbound mailbox message service
158 * @mport: RIO master port from which to release the mailbox resource
159 * @mbox: Mailbox number to release
160 *
161 * Releases ownership of an inbound mailbox resource. Returns 0
162 * if the request has been satisfied.
163 */
164int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
165{
166 rio_close_outb_mbox(mport, mbox);
167
168 /* Release the mailbox resource */
169 return release_resource(mport->outb_msg[mbox].res);
170}
171
172/**
173 * rio_setup_inb_dbell - bind inbound doorbell callback
174 * @mport: RIO master port to bind the doorbell callback
Matt Porter6978bbc2005-11-07 01:00:20 -0800175 * @dev_id: Device specific pointer to pass on event
Matt Porter394b7012005-11-07 01:00:15 -0800176 * @res: Doorbell message resource
177 * @dinb: Callback to execute when doorbell is received
178 *
179 * Adds a doorbell resource/callback pair into a port's
180 * doorbell event list. Returns 0 if the request has been
181 * satisfied.
182 */
183static int
Matt Porter6978bbc2005-11-07 01:00:20 -0800184rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
185 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
Matt Porter394b7012005-11-07 01:00:15 -0800186 u16 info))
187{
188 int rc = 0;
189 struct rio_dbell *dbell;
190
191 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
192 rc = -ENOMEM;
193 goto out;
194 }
195
196 dbell->res = res;
197 dbell->dinb = dinb;
Matt Porter6978bbc2005-11-07 01:00:20 -0800198 dbell->dev_id = dev_id;
Matt Porter394b7012005-11-07 01:00:15 -0800199
200 list_add_tail(&dbell->node, &mport->dbells);
201
202 out:
203 return rc;
204}
205
206/**
207 * rio_request_inb_dbell - request inbound doorbell message service
208 * @mport: RIO master port from which to allocate the doorbell resource
Matt Porter6978bbc2005-11-07 01:00:20 -0800209 * @dev_id: Device specific pointer to pass on event
Matt Porter394b7012005-11-07 01:00:15 -0800210 * @start: Doorbell info range start
211 * @end: Doorbell info range end
212 * @dinb: Callback to execute when doorbell is received
213 *
214 * Requests ownership of an inbound doorbell resource and binds
215 * a callback function to the resource. Returns 0 if the request
216 * has been satisfied.
217 */
218int rio_request_inb_dbell(struct rio_mport *mport,
Matt Porter6978bbc2005-11-07 01:00:20 -0800219 void *dev_id,
Matt Porter394b7012005-11-07 01:00:15 -0800220 u16 start,
221 u16 end,
Matt Porter6978bbc2005-11-07 01:00:20 -0800222 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
Matt Porter394b7012005-11-07 01:00:15 -0800223 u16 dst, u16 info))
224{
225 int rc = 0;
226
227 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
228
229 if (res) {
230 rio_init_dbell_res(res, start, end);
231
232 /* Make sure these doorbells aren't in use */
233 if ((rc =
234 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
235 res)) < 0) {
236 kfree(res);
237 goto out;
238 }
239
240 /* Hook the doorbell callback */
Matt Porter6978bbc2005-11-07 01:00:20 -0800241 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
Matt Porter394b7012005-11-07 01:00:15 -0800242 } else
243 rc = -ENOMEM;
244
245 out:
246 return rc;
247}
248
249/**
250 * rio_release_inb_dbell - release inbound doorbell message service
251 * @mport: RIO master port from which to release the doorbell resource
252 * @start: Doorbell info range start
253 * @end: Doorbell info range end
254 *
255 * Releases ownership of an inbound doorbell resource and removes
256 * callback from the doorbell event list. Returns 0 if the request
257 * has been satisfied.
258 */
259int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
260{
261 int rc = 0, found = 0;
262 struct rio_dbell *dbell;
263
264 list_for_each_entry(dbell, &mport->dbells, node) {
265 if ((dbell->res->start == start) && (dbell->res->end == end)) {
266 found = 1;
267 break;
268 }
269 }
270
271 /* If we can't find an exact match, fail */
272 if (!found) {
273 rc = -EINVAL;
274 goto out;
275 }
276
277 /* Delete from list */
278 list_del(&dbell->node);
279
280 /* Release the doorbell resource */
281 rc = release_resource(dbell->res);
282
283 /* Free the doorbell event */
284 kfree(dbell);
285
286 out:
287 return rc;
288}
289
290/**
291 * rio_request_outb_dbell - request outbound doorbell message range
292 * @rdev: RIO device from which to allocate the doorbell resource
293 * @start: Doorbell message range start
294 * @end: Doorbell message range end
295 *
296 * Requests ownership of a doorbell message range. Returns a resource
297 * if the request has been satisfied or %NULL on failure.
298 */
299struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
300 u16 end)
301{
302 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
303
304 if (res) {
305 rio_init_dbell_res(res, start, end);
306
307 /* Make sure these doorbells aren't in use */
308 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
309 < 0) {
310 kfree(res);
311 res = NULL;
312 }
313 }
314
315 return res;
316}
317
318/**
319 * rio_release_outb_dbell - release outbound doorbell message range
320 * @rdev: RIO device from which to release the doorbell resource
321 * @res: Doorbell resource to be freed
322 *
323 * Releases ownership of a doorbell message range. Returns 0 if the
324 * request has been satisfied.
325 */
326int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
327{
328 int rc = release_resource(res);
329
330 kfree(res);
331
332 return rc;
333}
334
335/**
336 * rio_mport_get_feature - query for devices' extended features
337 * @port: Master port to issue transaction
338 * @local: Indicate a local master port or remote device access
339 * @destid: Destination ID of the device
340 * @hopcount: Number of switch hops to the device
341 * @ftr: Extended feature code
342 *
343 * Tell if a device supports a given RapidIO capability.
344 * Returns the offset of the requested extended feature
345 * block within the device's RIO configuration space or
346 * 0 in case the device does not support it. Possible
347 * values for @ftr:
348 *
349 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
350 *
351 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
352 *
353 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
354 *
355 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices
356 *
357 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
358 *
359 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
360 */
361u32
362rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
363 u8 hopcount, int ftr)
364{
365 u32 asm_info, ext_ftr_ptr, ftr_header;
366
367 if (local)
368 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
369 else
370 rio_mport_read_config_32(port, destid, hopcount,
371 RIO_ASM_INFO_CAR, &asm_info);
372
373 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
374
375 while (ext_ftr_ptr) {
376 if (local)
377 rio_local_read_config_32(port, ext_ftr_ptr,
378 &ftr_header);
379 else
380 rio_mport_read_config_32(port, destid, hopcount,
381 ext_ftr_ptr, &ftr_header);
382 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
383 return ext_ftr_ptr;
384 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
385 break;
386 }
387
388 return 0;
389}
390
391/**
392 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
393 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
394 * @did: RIO did to match or %RIO_ANY_ID to match all dids
395 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
396 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
397 * @from: Previous RIO device found in search, or %NULL for new search
398 *
399 * Iterates through the list of known RIO devices. If a RIO device is
400 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
401 * count to the device is incrememted and a pointer to its device
402 * structure is returned. Otherwise, %NULL is returned. A new search
403 * is initiated by passing %NULL to the @from argument. Otherwise, if
404 * @from is not %NULL, searches continue from next device on the global
405 * list. The reference count for @from is always decremented if it is
406 * not %NULL.
407 */
408struct rio_dev *rio_get_asm(u16 vid, u16 did,
409 u16 asm_vid, u16 asm_did, struct rio_dev *from)
410{
411 struct list_head *n;
412 struct rio_dev *rdev;
413
414 WARN_ON(in_interrupt());
415 spin_lock(&rio_global_list_lock);
416 n = from ? from->global_list.next : rio_devices.next;
417
418 while (n && (n != &rio_devices)) {
419 rdev = rio_dev_g(n);
420 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
421 (did == RIO_ANY_ID || rdev->did == did) &&
422 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
423 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
424 goto exit;
425 n = n->next;
426 }
427 rdev = NULL;
428 exit:
429 rio_dev_put(from);
430 rdev = rio_dev_get(rdev);
431 spin_unlock(&rio_global_list_lock);
432 return rdev;
433}
434
435/**
436 * rio_get_device - Begin or continue searching for a RIO device by vid/did
437 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
438 * @did: RIO did to match or %RIO_ANY_ID to match all dids
439 * @from: Previous RIO device found in search, or %NULL for new search
440 *
441 * Iterates through the list of known RIO devices. If a RIO device is
442 * found with a matching @vid and @did, the reference count to the
443 * device is incrememted and a pointer to its device structure is returned.
444 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
445 * to the @from argument. Otherwise, if @from is not %NULL, searches
446 * continue from next device on the global list. The reference count for
447 * @from is always decremented if it is not %NULL.
448 */
449struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
450{
451 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
452}
453
454static void rio_fixup_device(struct rio_dev *dev)
455{
456}
457
458static int __devinit rio_init(void)
459{
460 struct rio_dev *dev = NULL;
461
462 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
463 rio_fixup_device(dev);
464 }
465 return 0;
466}
467
468device_initcall(rio_init);
469
470int rio_init_mports(void)
471{
472 int rc = 0;
473 struct rio_mport *port;
474
475 list_for_each_entry(port, &rio_mports, node) {
476 if (!request_mem_region(port->iores.start,
477 port->iores.end - port->iores.start,
478 port->name)) {
479 printk(KERN_ERR
Kumar Gala5febf1c2008-01-23 05:53:47 -0600480 "RIO: Error requesting master port region 0x%016llx-0x%016llx\n",
481 (u64)port->iores.start, (u64)port->iores.end - 1);
Matt Porter394b7012005-11-07 01:00:15 -0800482 rc = -ENOMEM;
483 goto out;
484 }
485
486 if (port->host_deviceid >= 0)
487 rio_enum_mport(port);
488 else
489 rio_disc_mport(port);
490 }
491
492 out:
493 return rc;
494}
495
496void rio_register_mport(struct rio_mport *port)
497{
498 list_add_tail(&port->node, &rio_mports);
499}
500
501EXPORT_SYMBOL_GPL(rio_local_get_device_id);
502EXPORT_SYMBOL_GPL(rio_get_device);
503EXPORT_SYMBOL_GPL(rio_get_asm);
504EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
505EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
506EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
507EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
508EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
509EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
510EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
511EXPORT_SYMBOL_GPL(rio_release_outb_mbox);