1 /*
2 * RapidIO enumeration and discovery support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15
16 #include <linux/delay.h>
17 #include <linux/dma-mapping.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>
25 #include <linux/timer.h>
26 #include <linux/jiffies.h>
27 #include <linux/slab.h>
28
29 #include "rio.h"
30
31 LIST_HEAD(rio_devices);
32 static LIST_HEAD(rio_switches);
33
34 #define RIO_ENUM_CMPL_MAGIC 0xdeadbeef
35
36 static void rio_enum_timeout(unsigned long);
37
38 DEFINE_SPINLOCK(rio_global_list_lock);
39
40 static int next_destid = 0;
41 static int next_switchid = 0;
42 static int next_net = 0;
43
44 static struct timer_list rio_enum_timer =
45 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
46
47 static int rio_mport_phys_table[] = {
48 RIO_EFB_PAR_EP_ID,
49 RIO_EFB_PAR_EP_REC_ID,
50 RIO_EFB_SER_EP_ID,
51 RIO_EFB_SER_EP_REC_ID,
52 -1,
53 };
54
55 static int rio_sport_phys_table[] = {
56 RIO_EFB_PAR_EP_FREE_ID,
57 RIO_EFB_SER_EP_FREE_ID,
58 -1,
59 };
60
61 /**
62 * rio_get_device_id - Get the base/extended device id for a device
63 * @port: RIO master port
64 * @destid: Destination ID of device
65 * @hopcount: Hopcount to device
66 *
67 * Reads the base/extended device id from a device. Returns the
68 * 8/16-bit device ID.
69 */
rio_get_device_id(struct rio_mport * port,u16 destid,u8 hopcount)70 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
71 {
72 u32 result;
73
74 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
75
76 return RIO_GET_DID(port->sys_size, result);
77 }
78
79 /**
80 * rio_set_device_id - Set the base/extended device id for a device
81 * @port: RIO master port
82 * @destid: Destination ID of device
83 * @hopcount: Hopcount to device
84 * @did: Device ID value to be written
85 *
86 * Writes the base/extended device id from a device.
87 */
rio_set_device_id(struct rio_mport * port,u16 destid,u8 hopcount,u16 did)88 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
89 {
90 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
91 RIO_SET_DID(port->sys_size, did));
92 }
93
94 /**
95 * rio_local_set_device_id - Set the base/extended device id for a port
96 * @port: RIO master port
97 * @did: Device ID value to be written
98 *
99 * Writes the base/extended device id from a device.
100 */
rio_local_set_device_id(struct rio_mport * port,u16 did)101 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
102 {
103 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
104 did));
105 }
106
107 /**
108 * rio_clear_locks- Release all host locks and signal enumeration complete
109 * @port: Master port to issue transaction
110 *
111 * Marks the component tag CSR on each device with the enumeration
112 * complete flag. When complete, it then release the host locks on
113 * each device. Returns 0 on success or %-EINVAL on failure.
114 */
rio_clear_locks(struct rio_mport * port)115 static int rio_clear_locks(struct rio_mport *port)
116 {
117 struct rio_dev *rdev;
118 u32 result;
119 int ret = 0;
120
121 /* Write component tag CSR magic complete value */
122 rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
123 RIO_ENUM_CMPL_MAGIC);
124 list_for_each_entry(rdev, &rio_devices, global_list)
125 rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
126 RIO_ENUM_CMPL_MAGIC);
127
128 /* Release host device id locks */
129 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
130 port->host_deviceid);
131 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
132 if ((result & 0xffff) != 0xffff) {
133 printk(KERN_INFO
134 "RIO: badness when releasing host lock on master port, result %8.8x\n",
135 result);
136 ret = -EINVAL;
137 }
138 list_for_each_entry(rdev, &rio_devices, global_list) {
139 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
140 port->host_deviceid);
141 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
142 if ((result & 0xffff) != 0xffff) {
143 printk(KERN_INFO
144 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
145 rdev->vid, rdev->did);
146 ret = -EINVAL;
147 }
148 }
149
150 return ret;
151 }
152
153 /**
154 * rio_enum_host- Set host lock and initialize host destination ID
155 * @port: Master port to issue transaction
156 *
157 * Sets the local host master port lock and destination ID register
158 * with the host device ID value. The host device ID value is provided
159 * by the platform. Returns %0 on success or %-1 on failure.
160 */
rio_enum_host(struct rio_mport * port)161 static int rio_enum_host(struct rio_mport *port)
162 {
163 u32 result;
164
165 /* Set master port host device id lock */
166 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
167 port->host_deviceid);
168
169 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
170 if ((result & 0xffff) != port->host_deviceid)
171 return -1;
172
173 /* Set master port destid and init destid ctr */
174 rio_local_set_device_id(port, port->host_deviceid);
175
176 if (next_destid == port->host_deviceid)
177 next_destid++;
178
179 return 0;
180 }
181
182 /**
183 * rio_device_has_destid- Test if a device contains a destination ID register
184 * @port: Master port to issue transaction
185 * @src_ops: RIO device source operations
186 * @dst_ops: RIO device destination operations
187 *
188 * Checks the provided @src_ops and @dst_ops for the necessary transaction
189 * capabilities that indicate whether or not a device will implement a
190 * destination ID register. Returns 1 if true or 0 if false.
191 */
rio_device_has_destid(struct rio_mport * port,int src_ops,int dst_ops)192 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
193 int dst_ops)
194 {
195 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
196
197 return !!((src_ops | dst_ops) & mask);
198 }
199
200 /**
201 * rio_release_dev- Frees a RIO device struct
202 * @dev: LDM device associated with a RIO device struct
203 *
204 * Gets the RIO device struct associated a RIO device struct.
205 * The RIO device struct is freed.
206 */
rio_release_dev(struct device * dev)207 static void rio_release_dev(struct device *dev)
208 {
209 struct rio_dev *rdev;
210
211 rdev = to_rio_dev(dev);
212 kfree(rdev);
213 }
214
215 /**
216 * rio_is_switch- Tests if a RIO device has switch capabilities
217 * @rdev: RIO device
218 *
219 * Gets the RIO device Processing Element Features register
220 * contents and tests for switch capabilities. Returns 1 if
221 * the device is a switch or 0 if it is not a switch.
222 * The RIO device struct is freed.
223 */
rio_is_switch(struct rio_dev * rdev)224 static int rio_is_switch(struct rio_dev *rdev)
225 {
226 if (rdev->pef & RIO_PEF_SWITCH)
227 return 1;
228 return 0;
229 }
230
231 /**
232 * rio_route_set_ops- Sets routing operations for a particular vendor switch
233 * @rdev: RIO device
234 *
235 * Searches the RIO route ops table for known switch types. If the vid
236 * and did match a switch table entry, then set the add_entry() and
237 * get_entry() ops to the table entry values.
238 */
rio_route_set_ops(struct rio_dev * rdev)239 static void rio_route_set_ops(struct rio_dev *rdev)
240 {
241 struct rio_route_ops *cur = __start_rio_route_ops;
242 struct rio_route_ops *end = __end_rio_route_ops;
243
244 while (cur < end) {
245 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
246 pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
247 rdev->rswitch->add_entry = cur->add_hook;
248 rdev->rswitch->get_entry = cur->get_hook;
249 }
250 cur++;
251 }
252
253 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
254 printk(KERN_ERR "RIO: missing routing ops for %s\n",
255 rio_name(rdev));
256 }
257
258 /**
259 * rio_add_device- Adds a RIO device to the device model
260 * @rdev: RIO device
261 *
262 * Adds the RIO device to the global device list and adds the RIO
263 * device to the RIO device list. Creates the generic sysfs nodes
264 * for an RIO device.
265 */
rio_add_device(struct rio_dev * rdev)266 static void __devinit rio_add_device(struct rio_dev *rdev)
267 {
268 device_add(&rdev->dev);
269
270 spin_lock(&rio_global_list_lock);
271 list_add_tail(&rdev->global_list, &rio_devices);
272 spin_unlock(&rio_global_list_lock);
273
274 rio_create_sysfs_dev_files(rdev);
275 }
276
277 /**
278 * rio_setup_device- Allocates and sets up a RIO device
279 * @net: RIO network
280 * @port: Master port to send transactions
281 * @destid: Current destination ID
282 * @hopcount: Current hopcount
283 * @do_enum: Enumeration/Discovery mode flag
284 *
285 * Allocates a RIO device and configures fields based on configuration
286 * space contents. If device has a destination ID register, a destination
287 * ID is either assigned in enumeration mode or read from configuration
288 * space in discovery mode. If the device has switch capabilities, then
289 * a switch is allocated and configured appropriately. Returns a pointer
290 * to a RIO device on success or NULL on failure.
291 *
292 */
rio_setup_device(struct rio_net * net,struct rio_mport * port,u16 destid,u8 hopcount,int do_enum)293 static struct rio_dev *rio_setup_device(struct rio_net *net,
294 struct rio_mport *port, u16 destid,
295 u8 hopcount, int do_enum)
296 {
297 struct rio_dev *rdev;
298 struct rio_switch *rswitch;
299 int result, rdid;
300
301 rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
302 if (!rdev)
303 goto out;
304
305 rdev->net = net;
306 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
307 &result);
308 rdev->did = result >> 16;
309 rdev->vid = result & 0xffff;
310 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
311 &rdev->device_rev);
312 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
313 &result);
314 rdev->asm_did = result >> 16;
315 rdev->asm_vid = result & 0xffff;
316 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
317 &result);
318 rdev->asm_rev = result >> 16;
319 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
320 &rdev->pef);
321 if (rdev->pef & RIO_PEF_EXT_FEATURES)
322 rdev->efptr = result & 0xffff;
323
324 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
325 &rdev->src_ops);
326 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
327 &rdev->dst_ops);
328
329 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
330 if (do_enum) {
331 rio_set_device_id(port, destid, hopcount, next_destid);
332 rdev->destid = next_destid++;
333 if (next_destid == port->host_deviceid)
334 next_destid++;
335 } else
336 rdev->destid = rio_get_device_id(port, destid, hopcount);
337 } else
338 /* Switch device has an associated destID */
339 rdev->destid = RIO_INVALID_DESTID;
340
341 /* If a PE has both switch and other functions, show it as a switch */
342 if (rio_is_switch(rdev)) {
343 rio_mport_read_config_32(port, destid, hopcount,
344 RIO_SWP_INFO_CAR, &rdev->swpinfo);
345 rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL);
346 if (!rswitch) {
347 kfree(rdev);
348 rdev = NULL;
349 goto out;
350 }
351 rswitch->switchid = next_switchid;
352 rswitch->hopcount = hopcount;
353 rswitch->destid = destid;
354 rswitch->route_table = kzalloc(sizeof(u8)*
355 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
356 GFP_KERNEL);
357 if (!rswitch->route_table) {
358 kfree(rdev);
359 rdev = NULL;
360 kfree(rswitch);
361 goto out;
362 }
363 /* Initialize switch route table */
364 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
365 rdid++)
366 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
367 rdev->rswitch = rswitch;
368 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
369 rdev->rswitch->switchid);
370 rio_route_set_ops(rdev);
371
372 list_add_tail(&rswitch->node, &rio_switches);
373
374 } else
375 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
376 rdev->destid);
377
378 rdev->dev.bus = &rio_bus_type;
379
380 device_initialize(&rdev->dev);
381 rdev->dev.release = rio_release_dev;
382 rio_dev_get(rdev);
383
384 rdev->dma_mask = DMA_32BIT_MASK;
385 rdev->dev.dma_mask = &rdev->dma_mask;
386 rdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
387
388 if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
389 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
390 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
391 0, 0xffff);
392
393 rio_add_device(rdev);
394
395 out:
396 return rdev;
397 }
398
399 /**
400 * rio_sport_is_active- Tests if a switch port has an active connection.
401 * @port: Master port to send transaction
402 * @destid: Associated destination ID for switch
403 * @hopcount: Hopcount to reach switch
404 * @sport: Switch port number
405 *
406 * Reads the port error status CSR for a particular switch port to
407 * determine if the port has an active link. Returns
408 * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
409 * inactive.
410 */
411 static int
rio_sport_is_active(struct rio_mport * port,u16 destid,u8 hopcount,int sport)412 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
413 {
414 u32 result;
415 u32 ext_ftr_ptr;
416
417 int *entry = rio_sport_phys_table;
418
419 do {
420 if ((ext_ftr_ptr =
421 rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
422
423 break;
424 } while (*++entry >= 0);
425
426 if (ext_ftr_ptr)
427 rio_mport_read_config_32(port, destid, hopcount,
428 ext_ftr_ptr +
429 RIO_PORT_N_ERR_STS_CSR(sport),
430 &result);
431
432 return (result & PORT_N_ERR_STS_PORT_OK);
433 }
434
435 /**
436 * rio_route_add_entry- Add a route entry to a switch routing table
437 * @mport: Master port to send transaction
438 * @rswitch: Switch device
439 * @table: Routing table ID
440 * @route_destid: Destination ID to be routed
441 * @route_port: Port number to be routed
442 *
443 * Calls the switch specific add_entry() method to add a route entry
444 * on a switch. The route table can be specified using the @table
445 * argument if a switch has per port routing tables or the normal
446 * use is to specific all tables (or the global table) by passing
447 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
448 * on failure.
449 */
rio_route_add_entry(struct rio_mport * mport,struct rio_switch * rswitch,u16 table,u16 route_destid,u8 route_port)450 static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
451 u16 table, u16 route_destid, u8 route_port)
452 {
453 return rswitch->add_entry(mport, rswitch->destid,
454 rswitch->hopcount, table,
455 route_destid, route_port);
456 }
457
458 /**
459 * rio_route_get_entry- Read a route entry in a switch routing table
460 * @mport: Master port to send transaction
461 * @rswitch: Switch device
462 * @table: Routing table ID
463 * @route_destid: Destination ID to be routed
464 * @route_port: Pointer to read port number into
465 *
466 * Calls the switch specific get_entry() method to read a route entry
467 * in a switch. The route table can be specified using the @table
468 * argument if a switch has per port routing tables or the normal
469 * use is to specific all tables (or the global table) by passing
470 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
471 * on failure.
472 */
473 static int
rio_route_get_entry(struct rio_mport * mport,struct rio_switch * rswitch,u16 table,u16 route_destid,u8 * route_port)474 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
475 u16 route_destid, u8 * route_port)
476 {
477 return rswitch->get_entry(mport, rswitch->destid,
478 rswitch->hopcount, table,
479 route_destid, route_port);
480 }
481
482 /**
483 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
484 * @port: Master port to send transaction
485 * @hopcount: Number of hops to the device
486 *
487 * Used during enumeration to read the Host Device ID Lock CSR on a
488 * RIO device. Returns the value of the lock register.
489 */
rio_get_host_deviceid_lock(struct rio_mport * port,u8 hopcount)490 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
491 {
492 u32 result;
493
494 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
495 RIO_HOST_DID_LOCK_CSR, &result);
496
497 return (u16) (result & 0xffff);
498 }
499
500 /**
501 * rio_get_swpinfo_inport- Gets the ingress port number
502 * @mport: Master port to send transaction
503 * @destid: Destination ID associated with the switch
504 * @hopcount: Number of hops to the device
505 *
506 * Returns port number being used to access the switch device.
507 */
508 static u8
rio_get_swpinfo_inport(struct rio_mport * mport,u16 destid,u8 hopcount)509 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
510 {
511 u32 result;
512
513 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
514 &result);
515
516 return (u8) (result & 0xff);
517 }
518
519 /**
520 * rio_get_swpinfo_tports- Gets total number of ports on the switch
521 * @mport: Master port to send transaction
522 * @destid: Destination ID associated with the switch
523 * @hopcount: Number of hops to the device
524 *
525 * Returns total numbers of ports implemented by the switch device.
526 */
rio_get_swpinfo_tports(struct rio_mport * mport,u16 destid,u8 hopcount)527 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
528 u8 hopcount)
529 {
530 u32 result;
531
532 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
533 &result);
534
535 return RIO_GET_TOTAL_PORTS(result);
536 }
537
538 /**
539 * rio_net_add_mport- Add a master port to a RIO network
540 * @net: RIO network
541 * @port: Master port to add
542 *
543 * Adds a master port to the network list of associated master
544 * ports..
545 */
rio_net_add_mport(struct rio_net * net,struct rio_mport * port)546 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
547 {
548 spin_lock(&rio_global_list_lock);
549 list_add_tail(&port->nnode, &net->mports);
550 spin_unlock(&rio_global_list_lock);
551 }
552
553 /**
554 * rio_enum_peer- Recursively enumerate a RIO network through a master port
555 * @net: RIO network being enumerated
556 * @port: Master port to send transactions
557 * @hopcount: Number of hops into the network
558 *
559 * Recursively enumerates a RIO network. Transactions are sent via the
560 * master port passed in @port.
561 */
rio_enum_peer(struct rio_net * net,struct rio_mport * port,u8 hopcount)562 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
563 u8 hopcount)
564 {
565 int port_num;
566 int num_ports;
567 int cur_destid;
568 int sw_destid;
569 int sw_inport;
570 struct rio_dev *rdev;
571 u16 destid;
572 int tmp;
573
574 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
575 pr_debug("RIO: PE already discovered by this host\n");
576 /*
577 * Already discovered by this host. Add it as another
578 * master port for the current network.
579 */
580 rio_net_add_mport(net, port);
581 return 0;
582 }
583
584 /* Attempt to acquire device lock */
585 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
586 hopcount,
587 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
588 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
589 < port->host_deviceid) {
590 /* Delay a bit */
591 mdelay(1);
592 /* Attempt to acquire device lock again */
593 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
594 hopcount,
595 RIO_HOST_DID_LOCK_CSR,
596 port->host_deviceid);
597 }
598
599 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
600 pr_debug(
601 "RIO: PE locked by a higher priority host...retreating\n");
602 return -1;
603 }
604
605 /* Setup new RIO device */
606 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
607 hopcount, 1);
608 if (rdev) {
609 /* Add device to the global and bus/net specific list. */
610 list_add_tail(&rdev->net_list, &net->devices);
611 } else
612 return -1;
613
614 if (rio_is_switch(rdev)) {
615 next_switchid++;
616 sw_inport = rio_get_swpinfo_inport(port,
617 RIO_ANY_DESTID(port->sys_size), hopcount);
618 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
619 port->host_deviceid, sw_inport);
620 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
621
622 for (destid = 0; destid < next_destid; destid++) {
623 if (destid == port->host_deviceid)
624 continue;
625 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
626 destid, sw_inport);
627 rdev->rswitch->route_table[destid] = sw_inport;
628 }
629
630 num_ports =
631 rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size),
632 hopcount);
633 pr_debug(
634 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
635 rio_name(rdev), rdev->vid, rdev->did, num_ports);
636 sw_destid = next_destid;
637 for (port_num = 0; port_num < num_ports; port_num++) {
638 if (sw_inport == port_num)
639 continue;
640
641 cur_destid = next_destid;
642
643 if (rio_sport_is_active
644 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
645 port_num)) {
646 pr_debug(
647 "RIO: scanning device on port %d\n",
648 port_num);
649 rio_route_add_entry(port, rdev->rswitch,
650 RIO_GLOBAL_TABLE,
651 RIO_ANY_DESTID(port->sys_size),
652 port_num);
653
654 if (rio_enum_peer(net, port, hopcount + 1) < 0)
655 return -1;
656
657 /* Update routing tables */
658 if (next_destid > cur_destid) {
659 for (destid = cur_destid;
660 destid < next_destid; destid++) {
661 if (destid == port->host_deviceid)
662 continue;
663 rio_route_add_entry(port, rdev->rswitch,
664 RIO_GLOBAL_TABLE,
665 destid,
666 port_num);
667 rdev->rswitch->
668 route_table[destid] =
669 port_num;
670 }
671 }
672 }
673 }
674
675 /* Check for empty switch */
676 if (next_destid == sw_destid) {
677 next_destid++;
678 if (next_destid == port->host_deviceid)
679 next_destid++;
680 }
681
682 rdev->rswitch->destid = sw_destid;
683 } else
684 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
685 rio_name(rdev), rdev->vid, rdev->did);
686
687 return 0;
688 }
689
690 /**
691 * rio_enum_complete- Tests if enumeration of a network is complete
692 * @port: Master port to send transaction
693 *
694 * Tests the Component Tag CSR for presence of the magic enumeration
695 * complete flag. Return %1 if enumeration is complete or %0 if
696 * enumeration is incomplete.
697 */
rio_enum_complete(struct rio_mport * port)698 static int rio_enum_complete(struct rio_mport *port)
699 {
700 u32 tag_csr;
701 int ret = 0;
702
703 rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
704
705 if (tag_csr == RIO_ENUM_CMPL_MAGIC)
706 ret = 1;
707
708 return ret;
709 }
710
711 /**
712 * rio_disc_peer- Recursively discovers a RIO network through a master port
713 * @net: RIO network being discovered
714 * @port: Master port to send transactions
715 * @destid: Current destination ID in network
716 * @hopcount: Number of hops into the network
717 *
718 * Recursively discovers a RIO network. Transactions are sent via the
719 * master port passed in @port.
720 */
721 static int
rio_disc_peer(struct rio_net * net,struct rio_mport * port,u16 destid,u8 hopcount)722 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
723 u8 hopcount)
724 {
725 u8 port_num, route_port;
726 int num_ports;
727 struct rio_dev *rdev;
728 u16 ndestid;
729
730 /* Setup new RIO device */
731 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
732 /* Add device to the global and bus/net specific list. */
733 list_add_tail(&rdev->net_list, &net->devices);
734 } else
735 return -1;
736
737 if (rio_is_switch(rdev)) {
738 next_switchid++;
739
740 /* Associated destid is how we accessed this switch */
741 rdev->rswitch->destid = destid;
742
743 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
744 pr_debug(
745 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
746 rio_name(rdev), rdev->vid, rdev->did, num_ports);
747 for (port_num = 0; port_num < num_ports; port_num++) {
748 if (rio_get_swpinfo_inport(port, destid, hopcount) ==
749 port_num)
750 continue;
751
752 if (rio_sport_is_active
753 (port, destid, hopcount, port_num)) {
754 pr_debug(
755 "RIO: scanning device on port %d\n",
756 port_num);
757 for (ndestid = 0;
758 ndestid < RIO_ANY_DESTID(port->sys_size);
759 ndestid++) {
760 rio_route_get_entry(port, rdev->rswitch,
761 RIO_GLOBAL_TABLE,
762 ndestid,
763 &route_port);
764 if (route_port == port_num)
765 break;
766 }
767
768 if (rio_disc_peer
769 (net, port, ndestid, hopcount + 1) < 0)
770 return -1;
771 }
772 }
773 } else
774 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
775 rio_name(rdev), rdev->vid, rdev->did);
776
777 return 0;
778 }
779
780 /**
781 * rio_mport_is_active- Tests if master port link is active
782 * @port: Master port to test
783 *
784 * Reads the port error status CSR for the master port to
785 * determine if the port has an active link. Returns
786 * %PORT_N_ERR_STS_PORT_OK if the master port is active
787 * or %0 if it is inactive.
788 */
rio_mport_is_active(struct rio_mport * port)789 static int rio_mport_is_active(struct rio_mport *port)
790 {
791 u32 result = 0;
792 u32 ext_ftr_ptr;
793 int *entry = rio_mport_phys_table;
794
795 do {
796 if ((ext_ftr_ptr =
797 rio_mport_get_feature(port, 1, 0, 0, *entry)))
798 break;
799 } while (*++entry >= 0);
800
801 if (ext_ftr_ptr)
802 rio_local_read_config_32(port,
803 ext_ftr_ptr +
804 RIO_PORT_N_ERR_STS_CSR(port->index),
805 &result);
806
807 return (result & PORT_N_ERR_STS_PORT_OK);
808 }
809
810 /**
811 * rio_alloc_net- Allocate and configure a new RIO network
812 * @port: Master port associated with the RIO network
813 *
814 * Allocates a RIO network structure, initializes per-network
815 * list heads, and adds the associated master port to the
816 * network list of associated master ports. Returns a
817 * RIO network pointer on success or %NULL on failure.
818 */
rio_alloc_net(struct rio_mport * port)819 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
820 {
821 struct rio_net *net;
822
823 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
824 if (net) {
825 INIT_LIST_HEAD(&net->node);
826 INIT_LIST_HEAD(&net->devices);
827 INIT_LIST_HEAD(&net->mports);
828 list_add_tail(&port->nnode, &net->mports);
829 net->hport = port;
830 net->id = next_net++;
831 }
832 return net;
833 }
834
835 /**
836 * rio_update_route_tables- Updates route tables in switches
837 * @port: Master port associated with the RIO network
838 *
839 * For each enumerated device, ensure that each switch in a system
840 * has correct routing entries. Add routes for devices that where
841 * unknown dirung the first enumeration pass through the switch.
842 */
rio_update_route_tables(struct rio_mport * port)843 static void rio_update_route_tables(struct rio_mport *port)
844 {
845 struct rio_dev *rdev;
846 struct rio_switch *rswitch;
847 u8 sport;
848 u16 destid;
849
850 list_for_each_entry(rdev, &rio_devices, global_list) {
851
852 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
853
854 list_for_each_entry(rswitch, &rio_switches, node) {
855
856 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
857 continue;
858
859 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
860
861 sport = rio_get_swpinfo_inport(port,
862 rswitch->destid, rswitch->hopcount);
863
864 if (rswitch->add_entry) {
865 rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport);
866 rswitch->route_table[destid] = sport;
867 }
868 }
869 }
870 }
871 }
872
873 /**
874 * rio_enum_mport- Start enumeration through a master port
875 * @mport: Master port to send transactions
876 *
877 * Starts the enumeration process. If somebody has enumerated our
878 * master port device, then give up. If not and we have an active
879 * link, then start recursive peer enumeration. Returns %0 if
880 * enumeration succeeds or %-EBUSY if enumeration fails.
881 */
rio_enum_mport(struct rio_mport * mport)882 int __devinit rio_enum_mport(struct rio_mport *mport)
883 {
884 struct rio_net *net = NULL;
885 int rc = 0;
886
887 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
888 mport->name);
889 /* If somebody else enumerated our master port device, bail. */
890 if (rio_enum_host(mport) < 0) {
891 printk(KERN_INFO
892 "RIO: master port %d device has been enumerated by a remote host\n",
893 mport->id);
894 rc = -EBUSY;
895 goto out;
896 }
897
898 /* If master port has an active link, allocate net and enum peers */
899 if (rio_mport_is_active(mport)) {
900 if (!(net = rio_alloc_net(mport))) {
901 printk(KERN_ERR "RIO: failed to allocate new net\n");
902 rc = -ENOMEM;
903 goto out;
904 }
905 if (rio_enum_peer(net, mport, 0) < 0) {
906 /* A higher priority host won enumeration, bail. */
907 printk(KERN_INFO
908 "RIO: master port %d device has lost enumeration to a remote host\n",
909 mport->id);
910 rio_clear_locks(mport);
911 rc = -EBUSY;
912 goto out;
913 }
914 rio_update_route_tables(mport);
915 rio_clear_locks(mport);
916 } else {
917 printk(KERN_INFO "RIO: master port %d link inactive\n",
918 mport->id);
919 rc = -EINVAL;
920 }
921
922 out:
923 return rc;
924 }
925
926 /**
927 * rio_build_route_tables- Generate route tables from switch route entries
928 *
929 * For each switch device, generate a route table by copying existing
930 * route entries from the switch.
931 */
rio_build_route_tables(void)932 static void rio_build_route_tables(void)
933 {
934 struct rio_dev *rdev;
935 int i;
936 u8 sport;
937
938 list_for_each_entry(rdev, &rio_devices, global_list)
939 if (rio_is_switch(rdev))
940 for (i = 0;
941 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
942 i++) {
943 if (rio_route_get_entry
944 (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE,
945 i, &sport) < 0)
946 continue;
947 rdev->rswitch->route_table[i] = sport;
948 }
949 }
950
951 /**
952 * rio_enum_timeout- Signal that enumeration timed out
953 * @data: Address of timeout flag.
954 *
955 * When the enumeration complete timer expires, set a flag that
956 * signals to the discovery process that enumeration did not
957 * complete in a sane amount of time.
958 */
rio_enum_timeout(unsigned long data)959 static void rio_enum_timeout(unsigned long data)
960 {
961 /* Enumeration timed out, set flag */
962 *(int *)data = 1;
963 }
964
965 /**
966 * rio_disc_mport- Start discovery through a master port
967 * @mport: Master port to send transactions
968 *
969 * Starts the discovery process. If we have an active link,
970 * then wait for the signal that enumeration is complete.
971 * When enumeration completion is signaled, start recursive
972 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
973 * on failure.
974 */
rio_disc_mport(struct rio_mport * mport)975 int __devinit rio_disc_mport(struct rio_mport *mport)
976 {
977 struct rio_net *net = NULL;
978 int enum_timeout_flag = 0;
979
980 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
981 mport->name);
982
983 /* If master port has an active link, allocate net and discover peers */
984 if (rio_mport_is_active(mport)) {
985 if (!(net = rio_alloc_net(mport))) {
986 printk(KERN_ERR "RIO: Failed to allocate new net\n");
987 goto bail;
988 }
989
990 pr_debug("RIO: wait for enumeration complete...");
991
992 rio_enum_timer.expires =
993 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
994 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
995 add_timer(&rio_enum_timer);
996 while (!rio_enum_complete(mport)) {
997 mdelay(1);
998 if (enum_timeout_flag) {
999 del_timer_sync(&rio_enum_timer);
1000 goto timeout;
1001 }
1002 }
1003 del_timer_sync(&rio_enum_timer);
1004
1005 pr_debug("done\n");
1006 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1007 0) < 0) {
1008 printk(KERN_INFO
1009 "RIO: master port %d device has failed discovery\n",
1010 mport->id);
1011 goto bail;
1012 }
1013
1014 rio_build_route_tables();
1015 }
1016
1017 return 0;
1018
1019 timeout:
1020 pr_debug("timeout\n");
1021 bail:
1022 return -EBUSY;
1023 }
1024