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Matt Portereb188d02005-11-07 01:00:17 -08001/*
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
Matt Portereb188d02005-11-07 01:00:17 -080013#include <linux/types.h>
14#include <linux/kernel.h>
15
16#include <linux/delay.h>
Matt Porterfa78cc52005-11-07 01:00:18 -080017#include <linux/dma-mapping.h>
Matt Portereb188d02005-11-07 01:00:17 -080018#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>
Tim Schmielaude259682006-01-08 01:02:05 -080026#include <linux/jiffies.h>
27#include <linux/slab.h>
Matt Portereb188d02005-11-07 01:00:17 -080028
29#include "rio.h"
30
31LIST_HEAD(rio_devices);
32static LIST_HEAD(rio_switches);
33
34#define RIO_ENUM_CMPL_MAGIC 0xdeadbeef
35
36static void rio_enum_timeout(unsigned long);
37
Matt Porterfa78cc52005-11-07 01:00:18 -080038DEFINE_SPINLOCK(rio_global_list_lock);
39
Matt Portereb188d02005-11-07 01:00:17 -080040static int next_destid = 0;
41static int next_switchid = 0;
42static int next_net = 0;
43
44static struct timer_list rio_enum_timer =
45TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
46
47static 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
55static int rio_sport_phys_table[] = {
56 RIO_EFB_PAR_EP_FREE_ID,
57 RIO_EFB_SER_EP_FREE_ID,
58 -1,
59};
60
Matt Portereb188d02005-11-07 01:00:17 -080061/**
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 */
70static 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(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 */
Matt Porterfa78cc52005-11-07 01:00:18 -080088static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
Matt Portereb188d02005-11-07 01:00:17 -080089{
90 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
91 RIO_SET_DID(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 */
101static 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(did));
104}
105
106/**
107 * rio_clear_locks- Release all host locks and signal enumeration complete
108 * @port: Master port to issue transaction
109 *
110 * Marks the component tag CSR on each device with the enumeration
111 * complete flag. When complete, it then release the host locks on
112 * each device. Returns 0 on success or %-EINVAL on failure.
113 */
114static int rio_clear_locks(struct rio_mport *port)
115{
116 struct rio_dev *rdev;
117 u32 result;
118 int ret = 0;
119
120 /* Write component tag CSR magic complete value */
121 rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
122 RIO_ENUM_CMPL_MAGIC);
123 list_for_each_entry(rdev, &rio_devices, global_list)
124 rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
125 RIO_ENUM_CMPL_MAGIC);
126
127 /* Release host device id locks */
128 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
129 port->host_deviceid);
130 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
131 if ((result & 0xffff) != 0xffff) {
132 printk(KERN_INFO
133 "RIO: badness when releasing host lock on master port, result %8.8x\n",
134 result);
135 ret = -EINVAL;
136 }
137 list_for_each_entry(rdev, &rio_devices, global_list) {
138 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
139 port->host_deviceid);
140 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
141 if ((result & 0xffff) != 0xffff) {
142 printk(KERN_INFO
143 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
144 rdev->vid, rdev->did);
145 ret = -EINVAL;
146 }
147 }
148
149 return ret;
150}
151
152/**
153 * rio_enum_host- Set host lock and initialize host destination ID
154 * @port: Master port to issue transaction
155 *
156 * Sets the local host master port lock and destination ID register
157 * with the host device ID value. The host device ID value is provided
158 * by the platform. Returns %0 on success or %-1 on failure.
159 */
160static int rio_enum_host(struct rio_mport *port)
161{
162 u32 result;
163
164 /* Set master port host device id lock */
165 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
166 port->host_deviceid);
167
168 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
169 if ((result & 0xffff) != port->host_deviceid)
170 return -1;
171
172 /* Set master port destid and init destid ctr */
173 rio_local_set_device_id(port, port->host_deviceid);
174
175 if (next_destid == port->host_deviceid)
176 next_destid++;
177
178 return 0;
179}
180
181/**
182 * rio_device_has_destid- Test if a device contains a destination ID register
183 * @port: Master port to issue transaction
184 * @src_ops: RIO device source operations
185 * @dst_ops: RIO device destination operations
186 *
187 * Checks the provided @src_ops and @dst_ops for the necessary transaction
188 * capabilities that indicate whether or not a device will implement a
189 * destination ID register. Returns 1 if true or 0 if false.
190 */
191static int rio_device_has_destid(struct rio_mport *port, int src_ops,
192 int dst_ops)
193{
Matt Porterfa78cc52005-11-07 01:00:18 -0800194 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;
195
196 return !!((src_ops | dst_ops) & mask);
Matt Portereb188d02005-11-07 01:00:17 -0800197}
198
199/**
200 * rio_release_dev- Frees a RIO device struct
201 * @dev: LDM device associated with a RIO device struct
202 *
203 * Gets the RIO device struct associated a RIO device struct.
204 * The RIO device struct is freed.
205 */
206static void rio_release_dev(struct device *dev)
207{
208 struct rio_dev *rdev;
209
210 rdev = to_rio_dev(dev);
211 kfree(rdev);
212}
213
214/**
215 * rio_is_switch- Tests if a RIO device has switch capabilities
216 * @rdev: RIO device
217 *
218 * Gets the RIO device Processing Element Features register
219 * contents and tests for switch capabilities. Returns 1 if
220 * the device is a switch or 0 if it is not a switch.
221 * The RIO device struct is freed.
222 */
223static int rio_is_switch(struct rio_dev *rdev)
224{
225 if (rdev->pef & RIO_PEF_SWITCH)
226 return 1;
227 return 0;
228}
229
230/**
231 * rio_route_set_ops- Sets routing operations for a particular vendor switch
232 * @rdev: RIO device
233 *
234 * Searches the RIO route ops table for known switch types. If the vid
235 * and did match a switch table entry, then set the add_entry() and
236 * get_entry() ops to the table entry values.
237 */
238static void rio_route_set_ops(struct rio_dev *rdev)
239{
240 struct rio_route_ops *cur = __start_rio_route_ops;
241 struct rio_route_ops *end = __end_rio_route_ops;
242
243 while (cur < end) {
244 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
245 pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
246 rdev->rswitch->add_entry = cur->add_hook;
247 rdev->rswitch->get_entry = cur->get_hook;
248 }
249 cur++;
250 }
251
252 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
253 printk(KERN_ERR "RIO: missing routing ops for %s\n",
254 rio_name(rdev));
255}
256
257/**
258 * rio_add_device- Adds a RIO device to the device model
259 * @rdev: RIO device
260 *
261 * Adds the RIO device to the global device list and adds the RIO
262 * device to the RIO device list. Creates the generic sysfs nodes
263 * for an RIO device.
264 */
265static void __devinit rio_add_device(struct rio_dev *rdev)
266{
267 device_add(&rdev->dev);
268
269 spin_lock(&rio_global_list_lock);
270 list_add_tail(&rdev->global_list, &rio_devices);
271 spin_unlock(&rio_global_list_lock);
272
273 rio_create_sysfs_dev_files(rdev);
274}
275
276/**
277 * rio_setup_device- Allocates and sets up a RIO device
278 * @net: RIO network
279 * @port: Master port to send transactions
280 * @destid: Current destination ID
281 * @hopcount: Current hopcount
282 * @do_enum: Enumeration/Discovery mode flag
283 *
284 * Allocates a RIO device and configures fields based on configuration
285 * space contents. If device has a destination ID register, a destination
286 * ID is either assigned in enumeration mode or read from configuration
287 * space in discovery mode. If the device has switch capabilities, then
288 * a switch is allocated and configured appropriately. Returns a pointer
289 * to a RIO device on success or NULL on failure.
290 *
291 */
292static struct rio_dev *rio_setup_device(struct rio_net *net,
293 struct rio_mport *port, u16 destid,
294 u8 hopcount, int do_enum)
295{
296 struct rio_dev *rdev;
297 struct rio_switch *rswitch;
298 int result, rdid;
299
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700300 rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800301 if (!rdev)
302 goto out;
303
Matt Portereb188d02005-11-07 01:00:17 -0800304 rdev->net = net;
305 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
306 &result);
307 rdev->did = result >> 16;
308 rdev->vid = result & 0xffff;
309 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
310 &rdev->device_rev);
311 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
312 &result);
313 rdev->asm_did = result >> 16;
314 rdev->asm_vid = result & 0xffff;
315 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
316 &result);
317 rdev->asm_rev = result >> 16;
318 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
319 &rdev->pef);
320 if (rdev->pef & RIO_PEF_EXT_FEATURES)
321 rdev->efptr = result & 0xffff;
322
323 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
324 &rdev->src_ops);
325 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
326 &rdev->dst_ops);
327
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800328 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
329 if (do_enum) {
330 rio_set_device_id(port, destid, hopcount, next_destid);
331 rdev->destid = next_destid++;
332 if (next_destid == port->host_deviceid)
333 next_destid++;
334 } else
335 rdev->destid = rio_get_device_id(port, destid, hopcount);
Matt Portereb188d02005-11-07 01:00:17 -0800336 } else
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800337 /* Switch device has an associated destID */
338 rdev->destid = RIO_INVALID_DESTID;
Matt Portereb188d02005-11-07 01:00:17 -0800339
340 /* If a PE has both switch and other functions, show it as a switch */
341 if (rio_is_switch(rdev)) {
342 rio_mport_read_config_32(port, destid, hopcount,
343 RIO_SWP_INFO_CAR, &rdev->swpinfo);
344 rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL);
345 if (!rswitch) {
346 kfree(rdev);
347 rdev = NULL;
348 goto out;
349 }
350 rswitch->switchid = next_switchid;
351 rswitch->hopcount = hopcount;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800352 rswitch->destid = destid;
Matt Portereb188d02005-11-07 01:00:17 -0800353 /* Initialize switch route table */
354 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++)
355 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
356 rdev->rswitch = rswitch;
357 sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id,
358 rdev->rswitch->switchid);
359 rio_route_set_ops(rdev);
360
361 list_add_tail(&rswitch->node, &rio_switches);
362
363 } else
364 sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id,
365 rdev->destid);
366
367 rdev->dev.bus = &rio_bus_type;
368
369 device_initialize(&rdev->dev);
370 rdev->dev.release = rio_release_dev;
371 rio_dev_get(rdev);
372
Matt Porterfa78cc52005-11-07 01:00:18 -0800373 rdev->dma_mask = DMA_32BIT_MASK;
374 rdev->dev.dma_mask = &rdev->dma_mask;
375 rdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
Matt Portereb188d02005-11-07 01:00:17 -0800376
377 if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
378 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
379 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
380 0, 0xffff);
381
382 rio_add_device(rdev);
383
384 out:
385 return rdev;
386}
387
388/**
389 * rio_sport_is_active- Tests if a switch port has an active connection.
390 * @port: Master port to send transaction
391 * @destid: Associated destination ID for switch
392 * @hopcount: Hopcount to reach switch
393 * @sport: Switch port number
394 *
395 * Reads the port error status CSR for a particular switch port to
396 * determine if the port has an active link. Returns
397 * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
398 * inactive.
399 */
400static int
401rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
402{
403 u32 result;
404 u32 ext_ftr_ptr;
405
406 int *entry = rio_sport_phys_table;
407
408 do {
409 if ((ext_ftr_ptr =
410 rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
411
412 break;
413 } while (*++entry >= 0);
414
415 if (ext_ftr_ptr)
416 rio_mport_read_config_32(port, destid, hopcount,
417 ext_ftr_ptr +
418 RIO_PORT_N_ERR_STS_CSR(sport),
419 &result);
420
421 return (result & PORT_N_ERR_STS_PORT_OK);
422}
423
424/**
425 * rio_route_add_entry- Add a route entry to a switch routing table
426 * @mport: Master port to send transaction
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800427 * @rswitch: Switch device
Matt Portereb188d02005-11-07 01:00:17 -0800428 * @table: Routing table ID
429 * @route_destid: Destination ID to be routed
430 * @route_port: Port number to be routed
431 *
432 * Calls the switch specific add_entry() method to add a route entry
433 * on a switch. The route table can be specified using the @table
434 * argument if a switch has per port routing tables or the normal
435 * use is to specific all tables (or the global table) by passing
436 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
437 * on failure.
438 */
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800439static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800440 u16 table, u16 route_destid, u8 route_port)
441{
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800442 return rswitch->add_entry(mport, rswitch->destid,
443 rswitch->hopcount, table,
Matt Portereb188d02005-11-07 01:00:17 -0800444 route_destid, route_port);
445}
446
447/**
448 * rio_route_get_entry- Read a route entry in a switch routing table
449 * @mport: Master port to send transaction
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800450 * @rswitch: Switch device
Matt Portereb188d02005-11-07 01:00:17 -0800451 * @table: Routing table ID
452 * @route_destid: Destination ID to be routed
453 * @route_port: Pointer to read port number into
454 *
455 * Calls the switch specific get_entry() method to read a route entry
456 * in a switch. The route table can be specified using the @table
457 * argument if a switch has per port routing tables or the normal
458 * use is to specific all tables (or the global table) by passing
459 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
460 * on failure.
461 */
462static int
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800463rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
Matt Portereb188d02005-11-07 01:00:17 -0800464 u16 route_destid, u8 * route_port)
465{
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800466 return rswitch->get_entry(mport, rswitch->destid,
467 rswitch->hopcount, table,
Matt Portereb188d02005-11-07 01:00:17 -0800468 route_destid, route_port);
469}
470
471/**
472 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
473 * @port: Master port to send transaction
474 * @hopcount: Number of hops to the device
475 *
476 * Used during enumeration to read the Host Device ID Lock CSR on a
477 * RIO device. Returns the value of the lock register.
478 */
479static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
480{
481 u32 result;
482
483 rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount,
484 RIO_HOST_DID_LOCK_CSR, &result);
485
486 return (u16) (result & 0xffff);
487}
488
489/**
490 * rio_get_swpinfo_inport- Gets the ingress port number
491 * @mport: Master port to send transaction
492 * @destid: Destination ID associated with the switch
493 * @hopcount: Number of hops to the device
494 *
495 * Returns port number being used to access the switch device.
496 */
497static u8
498rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
499{
500 u32 result;
501
502 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
503 &result);
504
505 return (u8) (result & 0xff);
506}
507
508/**
509 * rio_get_swpinfo_tports- Gets total number of ports on the switch
510 * @mport: Master port to send transaction
511 * @destid: Destination ID associated with the switch
512 * @hopcount: Number of hops to the device
513 *
514 * Returns total numbers of ports implemented by the switch device.
515 */
516static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
517 u8 hopcount)
518{
519 u32 result;
520
521 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
522 &result);
523
524 return RIO_GET_TOTAL_PORTS(result);
525}
526
527/**
528 * rio_net_add_mport- Add a master port to a RIO network
529 * @net: RIO network
530 * @port: Master port to add
531 *
532 * Adds a master port to the network list of associated master
533 * ports..
534 */
535static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
536{
537 spin_lock(&rio_global_list_lock);
538 list_add_tail(&port->nnode, &net->mports);
539 spin_unlock(&rio_global_list_lock);
540}
541
542/**
543 * rio_enum_peer- Recursively enumerate a RIO network through a master port
544 * @net: RIO network being enumerated
545 * @port: Master port to send transactions
546 * @hopcount: Number of hops into the network
547 *
548 * Recursively enumerates a RIO network. Transactions are sent via the
549 * master port passed in @port.
550 */
551static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
552 u8 hopcount)
553{
554 int port_num;
555 int num_ports;
556 int cur_destid;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800557 int sw_destid;
558 int sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800559 struct rio_dev *rdev;
560 u16 destid;
561 int tmp;
562
563 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
564 pr_debug("RIO: PE already discovered by this host\n");
565 /*
566 * Already discovered by this host. Add it as another
567 * master port for the current network.
568 */
569 rio_net_add_mport(net, port);
570 return 0;
571 }
572
573 /* Attempt to acquire device lock */
574 rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount,
575 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
576 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
577 < port->host_deviceid) {
578 /* Delay a bit */
579 mdelay(1);
580 /* Attempt to acquire device lock again */
581 rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount,
582 RIO_HOST_DID_LOCK_CSR,
583 port->host_deviceid);
584 }
585
586 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
587 pr_debug(
588 "RIO: PE locked by a higher priority host...retreating\n");
589 return -1;
590 }
591
592 /* Setup new RIO device */
593 if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) {
594 /* Add device to the global and bus/net specific list. */
595 list_add_tail(&rdev->net_list, &net->devices);
596 } else
597 return -1;
598
599 if (rio_is_switch(rdev)) {
600 next_switchid++;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800601 sw_inport = rio_get_swpinfo_inport(port, RIO_ANY_DESTID, hopcount);
602 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
603 port->host_deviceid, sw_inport);
604 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800605
606 for (destid = 0; destid < next_destid; destid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800607 if (destid == port->host_deviceid)
608 continue;
609 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
610 destid, sw_inport);
611 rdev->rswitch->route_table[destid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800612 }
613
614 num_ports =
615 rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount);
616 pr_debug(
617 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
618 rio_name(rdev), rdev->vid, rdev->did, num_ports);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800619 sw_destid = next_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800620 for (port_num = 0; port_num < num_ports; port_num++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800621 if (sw_inport == port_num)
Matt Portereb188d02005-11-07 01:00:17 -0800622 continue;
623
624 cur_destid = next_destid;
625
626 if (rio_sport_is_active
627 (port, RIO_ANY_DESTID, hopcount, port_num)) {
628 pr_debug(
629 "RIO: scanning device on port %d\n",
630 port_num);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800631 rio_route_add_entry(port, rdev->rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800632 RIO_GLOBAL_TABLE,
633 RIO_ANY_DESTID, port_num);
634
635 if (rio_enum_peer(net, port, hopcount + 1) < 0)
636 return -1;
637
638 /* Update routing tables */
639 if (next_destid > cur_destid) {
640 for (destid = cur_destid;
641 destid < next_destid; destid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800642 if (destid == port->host_deviceid)
643 continue;
644 rio_route_add_entry(port, rdev->rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800645 RIO_GLOBAL_TABLE,
646 destid,
647 port_num);
648 rdev->rswitch->
649 route_table[destid] =
650 port_num;
651 }
Matt Portereb188d02005-11-07 01:00:17 -0800652 }
653 }
654 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800655
656 /* Check for empty switch */
657 if (next_destid == sw_destid) {
658 next_destid++;
659 if (next_destid == port->host_deviceid)
660 next_destid++;
661 }
662
663 rdev->rswitch->destid = sw_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800664 } else
665 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
666 rio_name(rdev), rdev->vid, rdev->did);
667
668 return 0;
669}
670
671/**
672 * rio_enum_complete- Tests if enumeration of a network is complete
673 * @port: Master port to send transaction
674 *
675 * Tests the Component Tag CSR for presence of the magic enumeration
676 * complete flag. Return %1 if enumeration is complete or %0 if
677 * enumeration is incomplete.
678 */
679static int rio_enum_complete(struct rio_mport *port)
680{
681 u32 tag_csr;
682 int ret = 0;
683
684 rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
685
686 if (tag_csr == RIO_ENUM_CMPL_MAGIC)
687 ret = 1;
688
689 return ret;
690}
691
692/**
693 * rio_disc_peer- Recursively discovers a RIO network through a master port
694 * @net: RIO network being discovered
695 * @port: Master port to send transactions
696 * @destid: Current destination ID in network
697 * @hopcount: Number of hops into the network
698 *
699 * Recursively discovers a RIO network. Transactions are sent via the
700 * master port passed in @port.
701 */
702static int
703rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
704 u8 hopcount)
705{
706 u8 port_num, route_port;
707 int num_ports;
708 struct rio_dev *rdev;
709 u16 ndestid;
710
711 /* Setup new RIO device */
712 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
713 /* Add device to the global and bus/net specific list. */
714 list_add_tail(&rdev->net_list, &net->devices);
715 } else
716 return -1;
717
718 if (rio_is_switch(rdev)) {
719 next_switchid++;
720
721 /* Associated destid is how we accessed this switch */
722 rdev->rswitch->destid = destid;
723
724 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
725 pr_debug(
726 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
727 rio_name(rdev), rdev->vid, rdev->did, num_ports);
728 for (port_num = 0; port_num < num_ports; port_num++) {
729 if (rio_get_swpinfo_inport(port, destid, hopcount) ==
730 port_num)
731 continue;
732
733 if (rio_sport_is_active
734 (port, destid, hopcount, port_num)) {
735 pr_debug(
736 "RIO: scanning device on port %d\n",
737 port_num);
738 for (ndestid = 0; ndestid < RIO_ANY_DESTID;
739 ndestid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800740 rio_route_get_entry(port, rdev->rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800741 RIO_GLOBAL_TABLE,
742 ndestid,
743 &route_port);
744 if (route_port == port_num)
745 break;
746 }
747
748 if (rio_disc_peer
749 (net, port, ndestid, hopcount + 1) < 0)
750 return -1;
751 }
752 }
753 } else
754 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
755 rio_name(rdev), rdev->vid, rdev->did);
756
757 return 0;
758}
759
760/**
761 * rio_mport_is_active- Tests if master port link is active
762 * @port: Master port to test
763 *
764 * Reads the port error status CSR for the master port to
765 * determine if the port has an active link. Returns
766 * %PORT_N_ERR_STS_PORT_OK if the master port is active
767 * or %0 if it is inactive.
768 */
769static int rio_mport_is_active(struct rio_mport *port)
770{
771 u32 result = 0;
772 u32 ext_ftr_ptr;
773 int *entry = rio_mport_phys_table;
774
775 do {
776 if ((ext_ftr_ptr =
777 rio_mport_get_feature(port, 1, 0, 0, *entry)))
778 break;
779 } while (*++entry >= 0);
780
781 if (ext_ftr_ptr)
782 rio_local_read_config_32(port,
783 ext_ftr_ptr +
784 RIO_PORT_N_ERR_STS_CSR(port->index),
785 &result);
786
787 return (result & PORT_N_ERR_STS_PORT_OK);
788}
789
790/**
791 * rio_alloc_net- Allocate and configure a new RIO network
792 * @port: Master port associated with the RIO network
793 *
794 * Allocates a RIO network structure, initializes per-network
795 * list heads, and adds the associated master port to the
796 * network list of associated master ports. Returns a
797 * RIO network pointer on success or %NULL on failure.
798 */
799static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
800{
801 struct rio_net *net;
802
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700803 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800804 if (net) {
Matt Portereb188d02005-11-07 01:00:17 -0800805 INIT_LIST_HEAD(&net->node);
806 INIT_LIST_HEAD(&net->devices);
807 INIT_LIST_HEAD(&net->mports);
808 list_add_tail(&port->nnode, &net->mports);
809 net->hport = port;
810 net->id = next_net++;
811 }
812 return net;
813}
814
815/**
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800816 * rio_update_route_tables- Updates route tables in switches
817 * @port: Master port associated with the RIO network
818 *
819 * For each enumerated device, ensure that each switch in a system
820 * has correct routing entries. Add routes for devices that where
821 * unknown dirung the first enumeration pass through the switch.
822 */
823static void rio_update_route_tables(struct rio_mport *port)
824{
825 struct rio_dev *rdev;
826 struct rio_switch *rswitch;
827 u8 sport;
828 u16 destid;
829
830 list_for_each_entry(rdev, &rio_devices, global_list) {
831
832 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
833
834 list_for_each_entry(rswitch, &rio_switches, node) {
835
836 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
837 continue;
838
839 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
840
841 sport = rio_get_swpinfo_inport(port,
842 rswitch->destid, rswitch->hopcount);
843
844 if (rswitch->add_entry) {
845 rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport);
846 rswitch->route_table[destid] = sport;
847 }
848 }
849 }
850 }
851}
852
853/**
Matt Portereb188d02005-11-07 01:00:17 -0800854 * rio_enum_mport- Start enumeration through a master port
855 * @mport: Master port to send transactions
856 *
857 * Starts the enumeration process. If somebody has enumerated our
858 * master port device, then give up. If not and we have an active
859 * link, then start recursive peer enumeration. Returns %0 if
860 * enumeration succeeds or %-EBUSY if enumeration fails.
861 */
862int rio_enum_mport(struct rio_mport *mport)
863{
864 struct rio_net *net = NULL;
865 int rc = 0;
866
867 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
868 mport->name);
869 /* If somebody else enumerated our master port device, bail. */
870 if (rio_enum_host(mport) < 0) {
871 printk(KERN_INFO
872 "RIO: master port %d device has been enumerated by a remote host\n",
873 mport->id);
874 rc = -EBUSY;
875 goto out;
876 }
877
878 /* If master port has an active link, allocate net and enum peers */
879 if (rio_mport_is_active(mport)) {
880 if (!(net = rio_alloc_net(mport))) {
881 printk(KERN_ERR "RIO: failed to allocate new net\n");
882 rc = -ENOMEM;
883 goto out;
884 }
885 if (rio_enum_peer(net, mport, 0) < 0) {
886 /* A higher priority host won enumeration, bail. */
887 printk(KERN_INFO
888 "RIO: master port %d device has lost enumeration to a remote host\n",
889 mport->id);
890 rio_clear_locks(mport);
891 rc = -EBUSY;
892 goto out;
893 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800894 rio_update_route_tables(mport);
Matt Portereb188d02005-11-07 01:00:17 -0800895 rio_clear_locks(mport);
896 } else {
897 printk(KERN_INFO "RIO: master port %d link inactive\n",
898 mport->id);
899 rc = -EINVAL;
900 }
901
902 out:
903 return rc;
904}
905
906/**
907 * rio_build_route_tables- Generate route tables from switch route entries
908 *
909 * For each switch device, generate a route table by copying existing
910 * route entries from the switch.
911 */
912static void rio_build_route_tables(void)
913{
914 struct rio_dev *rdev;
915 int i;
916 u8 sport;
917
918 list_for_each_entry(rdev, &rio_devices, global_list)
919 if (rio_is_switch(rdev))
920 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
921 if (rio_route_get_entry
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800922 (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE,
923 i, &sport) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800924 continue;
925 rdev->rswitch->route_table[i] = sport;
926 }
927}
928
929/**
930 * rio_enum_timeout- Signal that enumeration timed out
931 * @data: Address of timeout flag.
932 *
933 * When the enumeration complete timer expires, set a flag that
934 * signals to the discovery process that enumeration did not
935 * complete in a sane amount of time.
936 */
937static void rio_enum_timeout(unsigned long data)
938{
939 /* Enumeration timed out, set flag */
940 *(int *)data = 1;
941}
942
943/**
944 * rio_disc_mport- Start discovery through a master port
945 * @mport: Master port to send transactions
946 *
947 * Starts the discovery process. If we have an active link,
948 * then wait for the signal that enumeration is complete.
949 * When enumeration completion is signaled, start recursive
950 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
951 * on failure.
952 */
953int rio_disc_mport(struct rio_mport *mport)
954{
955 struct rio_net *net = NULL;
956 int enum_timeout_flag = 0;
957
958 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
959 mport->name);
960
961 /* If master port has an active link, allocate net and discover peers */
962 if (rio_mport_is_active(mport)) {
963 if (!(net = rio_alloc_net(mport))) {
964 printk(KERN_ERR "RIO: Failed to allocate new net\n");
965 goto bail;
966 }
967
968 pr_debug("RIO: wait for enumeration complete...");
969
970 rio_enum_timer.expires =
971 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
972 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
973 add_timer(&rio_enum_timer);
974 while (!rio_enum_complete(mport)) {
975 mdelay(1);
976 if (enum_timeout_flag) {
977 del_timer_sync(&rio_enum_timer);
978 goto timeout;
979 }
980 }
981 del_timer_sync(&rio_enum_timer);
982
983 pr_debug("done\n");
984 if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) {
985 printk(KERN_INFO
986 "RIO: master port %d device has failed discovery\n",
987 mport->id);
988 goto bail;
989 }
990
991 rio_build_route_tables();
992 }
993
994 return 0;
995
996 timeout:
997 pr_debug("timeout\n");
998 bail:
999 return -EBUSY;
1000}