blob: 45415096c2940d5bb834341cdcf5c76f3ffc38e6 [file] [log] [blame]
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
Zhang Weie0423232008-04-18 13:33:42 -070076 return RIO_GET_DID(port->sys_size, result);
Matt Portereb188d02005-11-07 01:00:17 -080077}
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,
Zhang Weie0423232008-04-18 13:33:42 -070091 RIO_SET_DID(port->sys_size, did));
Matt Portereb188d02005-11-07 01:00:17 -080092}
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{
Zhang Weie0423232008-04-18 13:33:42 -0700103 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
104 did));
Matt Portereb188d02005-11-07 01:00:17 -0800105}
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 */
115static 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 */
161static 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 */
192static int rio_device_has_destid(struct rio_mport *port, int src_ops,
193 int dst_ops)
194{
Matt Porterfa78cc52005-11-07 01:00:18 -0800195 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);
Matt Portereb188d02005-11-07 01:00:17 -0800198}
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 */
207static 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 */
224static 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 */
239static 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 */
Yang Li5f28c522009-05-11 22:36:02 +0000266static int __devinit rio_add_device(struct rio_dev *rdev)
Matt Portereb188d02005-11-07 01:00:17 -0800267{
Yang Li5f28c522009-05-11 22:36:02 +0000268 int err;
269
270 err = device_add(&rdev->dev);
271 if (err)
272 return err;
Matt Portereb188d02005-11-07 01:00:17 -0800273
274 spin_lock(&rio_global_list_lock);
275 list_add_tail(&rdev->global_list, &rio_devices);
276 spin_unlock(&rio_global_list_lock);
277
278 rio_create_sysfs_dev_files(rdev);
Yang Li5f28c522009-05-11 22:36:02 +0000279
280 return 0;
Matt Portereb188d02005-11-07 01:00:17 -0800281}
282
283/**
284 * rio_setup_device- Allocates and sets up a RIO device
285 * @net: RIO network
286 * @port: Master port to send transactions
287 * @destid: Current destination ID
288 * @hopcount: Current hopcount
289 * @do_enum: Enumeration/Discovery mode flag
290 *
291 * Allocates a RIO device and configures fields based on configuration
292 * space contents. If device has a destination ID register, a destination
293 * ID is either assigned in enumeration mode or read from configuration
294 * space in discovery mode. If the device has switch capabilities, then
295 * a switch is allocated and configured appropriately. Returns a pointer
296 * to a RIO device on success or NULL on failure.
297 *
298 */
Li Yang181a6ff2009-05-12 16:36:03 +0800299static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
Matt Portereb188d02005-11-07 01:00:17 -0800300 struct rio_mport *port, u16 destid,
301 u8 hopcount, int do_enum)
302{
Yang Li5f28c522009-05-11 22:36:02 +0000303 int ret = 0;
Matt Portereb188d02005-11-07 01:00:17 -0800304 struct rio_dev *rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000305 struct rio_switch *rswitch = NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800306 int result, rdid;
307
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700308 rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800309 if (!rdev)
Yang Li5f28c522009-05-11 22:36:02 +0000310 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800311
Matt Portereb188d02005-11-07 01:00:17 -0800312 rdev->net = net;
313 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
314 &result);
315 rdev->did = result >> 16;
316 rdev->vid = result & 0xffff;
317 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
318 &rdev->device_rev);
319 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
320 &result);
321 rdev->asm_did = result >> 16;
322 rdev->asm_vid = result & 0xffff;
323 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
324 &result);
325 rdev->asm_rev = result >> 16;
326 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
327 &rdev->pef);
328 if (rdev->pef & RIO_PEF_EXT_FEATURES)
329 rdev->efptr = result & 0xffff;
330
331 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
332 &rdev->src_ops);
333 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
334 &rdev->dst_ops);
335
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800336 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
337 if (do_enum) {
338 rio_set_device_id(port, destid, hopcount, next_destid);
339 rdev->destid = next_destid++;
340 if (next_destid == port->host_deviceid)
341 next_destid++;
342 } else
343 rdev->destid = rio_get_device_id(port, destid, hopcount);
Matt Portereb188d02005-11-07 01:00:17 -0800344 } else
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800345 /* Switch device has an associated destID */
346 rdev->destid = RIO_INVALID_DESTID;
Matt Portereb188d02005-11-07 01:00:17 -0800347
348 /* If a PE has both switch and other functions, show it as a switch */
349 if (rio_is_switch(rdev)) {
350 rio_mport_read_config_32(port, destid, hopcount,
351 RIO_SWP_INFO_CAR, &rdev->swpinfo);
352 rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL);
Yang Li5f28c522009-05-11 22:36:02 +0000353 if (!rswitch)
354 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800355 rswitch->switchid = next_switchid;
356 rswitch->hopcount = hopcount;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800357 rswitch->destid = destid;
Zhang Weie0423232008-04-18 13:33:42 -0700358 rswitch->route_table = kzalloc(sizeof(u8)*
359 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
360 GFP_KERNEL);
Yang Li5f28c522009-05-11 22:36:02 +0000361 if (!rswitch->route_table)
362 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800363 /* Initialize switch route table */
Zhang Weie0423232008-04-18 13:33:42 -0700364 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
365 rdid++)
Matt Portereb188d02005-11-07 01:00:17 -0800366 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
367 rdev->rswitch = rswitch;
Kay Sieversb53c75832008-12-04 10:01:52 -0800368 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
369 rdev->rswitch->switchid);
Matt Portereb188d02005-11-07 01:00:17 -0800370 rio_route_set_ops(rdev);
371
372 list_add_tail(&rswitch->node, &rio_switches);
373
374 } else
Kay Sieversb53c75832008-12-04 10:01:52 -0800375 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
376 rdev->destid);
Matt Portereb188d02005-11-07 01:00:17 -0800377
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
Yang Hongyang284901a2009-04-06 19:01:15 -0700384 rdev->dma_mask = DMA_BIT_MASK(32);
Matt Porterfa78cc52005-11-07 01:00:18 -0800385 rdev->dev.dma_mask = &rdev->dma_mask;
Yang Hongyang284901a2009-04-06 19:01:15 -0700386 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Matt Portereb188d02005-11-07 01:00:17 -0800387
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
Yang Li5f28c522009-05-11 22:36:02 +0000393 ret = rio_add_device(rdev);
394 if (ret)
395 goto cleanup;
Matt Portereb188d02005-11-07 01:00:17 -0800396
Matt Portereb188d02005-11-07 01:00:17 -0800397 return rdev;
Yang Li5f28c522009-05-11 22:36:02 +0000398
399cleanup:
400 if (rswitch) {
401 kfree(rswitch->route_table);
402 kfree(rswitch);
403 }
404 kfree(rdev);
405 return NULL;
Matt Portereb188d02005-11-07 01:00:17 -0800406}
407
408/**
409 * rio_sport_is_active- Tests if a switch port has an active connection.
410 * @port: Master port to send transaction
411 * @destid: Associated destination ID for switch
412 * @hopcount: Hopcount to reach switch
413 * @sport: Switch port number
414 *
415 * Reads the port error status CSR for a particular switch port to
416 * determine if the port has an active link. Returns
417 * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
418 * inactive.
419 */
420static int
421rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
422{
423 u32 result;
424 u32 ext_ftr_ptr;
425
426 int *entry = rio_sport_phys_table;
427
428 do {
429 if ((ext_ftr_ptr =
430 rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
431
432 break;
433 } while (*++entry >= 0);
434
435 if (ext_ftr_ptr)
436 rio_mport_read_config_32(port, destid, hopcount,
437 ext_ftr_ptr +
438 RIO_PORT_N_ERR_STS_CSR(sport),
439 &result);
440
441 return (result & PORT_N_ERR_STS_PORT_OK);
442}
443
444/**
445 * rio_route_add_entry- Add a route entry to a switch routing table
446 * @mport: Master port to send transaction
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800447 * @rswitch: Switch device
Matt Portereb188d02005-11-07 01:00:17 -0800448 * @table: Routing table ID
449 * @route_destid: Destination ID to be routed
450 * @route_port: Port number to be routed
451 *
452 * Calls the switch specific add_entry() method to add a route entry
453 * on a switch. The route table can be specified using the @table
454 * argument if a switch has per port routing tables or the normal
455 * use is to specific all tables (or the global table) by passing
456 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
457 * on failure.
458 */
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800459static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800460 u16 table, u16 route_destid, u8 route_port)
461{
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800462 return rswitch->add_entry(mport, rswitch->destid,
463 rswitch->hopcount, table,
Matt Portereb188d02005-11-07 01:00:17 -0800464 route_destid, route_port);
465}
466
467/**
468 * rio_route_get_entry- Read a route entry in a switch routing table
469 * @mport: Master port to send transaction
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800470 * @rswitch: Switch device
Matt Portereb188d02005-11-07 01:00:17 -0800471 * @table: Routing table ID
472 * @route_destid: Destination ID to be routed
473 * @route_port: Pointer to read port number into
474 *
475 * Calls the switch specific get_entry() method to read a route entry
476 * in a switch. The route table can be specified using the @table
477 * argument if a switch has per port routing tables or the normal
478 * use is to specific all tables (or the global table) by passing
479 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
480 * on failure.
481 */
482static int
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800483rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
Matt Portereb188d02005-11-07 01:00:17 -0800484 u16 route_destid, u8 * route_port)
485{
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800486 return rswitch->get_entry(mport, rswitch->destid,
487 rswitch->hopcount, table,
Matt Portereb188d02005-11-07 01:00:17 -0800488 route_destid, route_port);
489}
490
491/**
492 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
493 * @port: Master port to send transaction
494 * @hopcount: Number of hops to the device
495 *
496 * Used during enumeration to read the Host Device ID Lock CSR on a
497 * RIO device. Returns the value of the lock register.
498 */
499static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
500{
501 u32 result;
502
Zhang Weie0423232008-04-18 13:33:42 -0700503 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800504 RIO_HOST_DID_LOCK_CSR, &result);
505
506 return (u16) (result & 0xffff);
507}
508
509/**
510 * rio_get_swpinfo_inport- Gets the ingress port number
511 * @mport: Master port to send transaction
512 * @destid: Destination ID associated with the switch
513 * @hopcount: Number of hops to the device
514 *
515 * Returns port number being used to access the switch device.
516 */
517static u8
518rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
519{
520 u32 result;
521
522 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
523 &result);
524
525 return (u8) (result & 0xff);
526}
527
528/**
529 * rio_get_swpinfo_tports- Gets total number of ports on the switch
530 * @mport: Master port to send transaction
531 * @destid: Destination ID associated with the switch
532 * @hopcount: Number of hops to the device
533 *
534 * Returns total numbers of ports implemented by the switch device.
535 */
536static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
537 u8 hopcount)
538{
539 u32 result;
540
541 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
542 &result);
543
544 return RIO_GET_TOTAL_PORTS(result);
545}
546
547/**
548 * rio_net_add_mport- Add a master port to a RIO network
549 * @net: RIO network
550 * @port: Master port to add
551 *
552 * Adds a master port to the network list of associated master
553 * ports..
554 */
555static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
556{
557 spin_lock(&rio_global_list_lock);
558 list_add_tail(&port->nnode, &net->mports);
559 spin_unlock(&rio_global_list_lock);
560}
561
562/**
563 * rio_enum_peer- Recursively enumerate a RIO network through a master port
564 * @net: RIO network being enumerated
565 * @port: Master port to send transactions
566 * @hopcount: Number of hops into the network
567 *
568 * Recursively enumerates a RIO network. Transactions are sent via the
569 * master port passed in @port.
570 */
Li Yang181a6ff2009-05-12 16:36:03 +0800571static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
Matt Portereb188d02005-11-07 01:00:17 -0800572 u8 hopcount)
573{
574 int port_num;
575 int num_ports;
576 int cur_destid;
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800577 int sw_destid;
578 int sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800579 struct rio_dev *rdev;
580 u16 destid;
581 int tmp;
582
583 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
584 pr_debug("RIO: PE already discovered by this host\n");
585 /*
586 * Already discovered by this host. Add it as another
587 * master port for the current network.
588 */
589 rio_net_add_mport(net, port);
590 return 0;
591 }
592
593 /* Attempt to acquire device lock */
Zhang Weie0423232008-04-18 13:33:42 -0700594 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
595 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800596 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
597 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
598 < port->host_deviceid) {
599 /* Delay a bit */
600 mdelay(1);
601 /* Attempt to acquire device lock again */
Zhang Weie0423232008-04-18 13:33:42 -0700602 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
603 hopcount,
Matt Portereb188d02005-11-07 01:00:17 -0800604 RIO_HOST_DID_LOCK_CSR,
605 port->host_deviceid);
606 }
607
608 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
609 pr_debug(
610 "RIO: PE locked by a higher priority host...retreating\n");
611 return -1;
612 }
613
614 /* Setup new RIO device */
Zhang Weie0423232008-04-18 13:33:42 -0700615 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
616 hopcount, 1);
617 if (rdev) {
Matt Portereb188d02005-11-07 01:00:17 -0800618 /* Add device to the global and bus/net specific list. */
619 list_add_tail(&rdev->net_list, &net->devices);
620 } else
621 return -1;
622
623 if (rio_is_switch(rdev)) {
624 next_switchid++;
Zhang Weie0423232008-04-18 13:33:42 -0700625 sw_inport = rio_get_swpinfo_inport(port,
626 RIO_ANY_DESTID(port->sys_size), hopcount);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800627 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
628 port->host_deviceid, sw_inport);
629 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800630
631 for (destid = 0; destid < next_destid; destid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800632 if (destid == port->host_deviceid)
633 continue;
634 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
635 destid, sw_inport);
636 rdev->rswitch->route_table[destid] = sw_inport;
Matt Portereb188d02005-11-07 01:00:17 -0800637 }
638
639 num_ports =
Zhang Weie0423232008-04-18 13:33:42 -0700640 rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size),
641 hopcount);
Matt Portereb188d02005-11-07 01:00:17 -0800642 pr_debug(
643 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
644 rio_name(rdev), rdev->vid, rdev->did, num_ports);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800645 sw_destid = next_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800646 for (port_num = 0; port_num < num_ports; port_num++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800647 if (sw_inport == port_num)
Matt Portereb188d02005-11-07 01:00:17 -0800648 continue;
649
650 cur_destid = next_destid;
651
652 if (rio_sport_is_active
Zhang Weie0423232008-04-18 13:33:42 -0700653 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
654 port_num)) {
Matt Portereb188d02005-11-07 01:00:17 -0800655 pr_debug(
656 "RIO: scanning device on port %d\n",
657 port_num);
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800658 rio_route_add_entry(port, rdev->rswitch,
Zhang Weie0423232008-04-18 13:33:42 -0700659 RIO_GLOBAL_TABLE,
660 RIO_ANY_DESTID(port->sys_size),
661 port_num);
Matt Portereb188d02005-11-07 01:00:17 -0800662
663 if (rio_enum_peer(net, port, hopcount + 1) < 0)
664 return -1;
665
666 /* Update routing tables */
667 if (next_destid > cur_destid) {
668 for (destid = cur_destid;
669 destid < next_destid; destid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800670 if (destid == port->host_deviceid)
671 continue;
672 rio_route_add_entry(port, rdev->rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800673 RIO_GLOBAL_TABLE,
674 destid,
675 port_num);
676 rdev->rswitch->
677 route_table[destid] =
678 port_num;
679 }
Matt Portereb188d02005-11-07 01:00:17 -0800680 }
681 }
682 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800683
684 /* Check for empty switch */
685 if (next_destid == sw_destid) {
686 next_destid++;
687 if (next_destid == port->host_deviceid)
688 next_destid++;
689 }
690
691 rdev->rswitch->destid = sw_destid;
Matt Portereb188d02005-11-07 01:00:17 -0800692 } else
693 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
694 rio_name(rdev), rdev->vid, rdev->did);
695
696 return 0;
697}
698
699/**
700 * rio_enum_complete- Tests if enumeration of a network is complete
701 * @port: Master port to send transaction
702 *
703 * Tests the Component Tag CSR for presence of the magic enumeration
704 * complete flag. Return %1 if enumeration is complete or %0 if
705 * enumeration is incomplete.
706 */
707static int rio_enum_complete(struct rio_mport *port)
708{
709 u32 tag_csr;
710 int ret = 0;
711
712 rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
713
714 if (tag_csr == RIO_ENUM_CMPL_MAGIC)
715 ret = 1;
716
717 return ret;
718}
719
720/**
721 * rio_disc_peer- Recursively discovers a RIO network through a master port
722 * @net: RIO network being discovered
723 * @port: Master port to send transactions
724 * @destid: Current destination ID in network
725 * @hopcount: Number of hops into the network
726 *
727 * Recursively discovers a RIO network. Transactions are sent via the
728 * master port passed in @port.
729 */
Li Yang181a6ff2009-05-12 16:36:03 +0800730static int __devinit
Matt Portereb188d02005-11-07 01:00:17 -0800731rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
732 u8 hopcount)
733{
734 u8 port_num, route_port;
735 int num_ports;
736 struct rio_dev *rdev;
737 u16 ndestid;
738
739 /* Setup new RIO device */
740 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
741 /* Add device to the global and bus/net specific list. */
742 list_add_tail(&rdev->net_list, &net->devices);
743 } else
744 return -1;
745
746 if (rio_is_switch(rdev)) {
747 next_switchid++;
748
749 /* Associated destid is how we accessed this switch */
750 rdev->rswitch->destid = destid;
751
752 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
753 pr_debug(
754 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
755 rio_name(rdev), rdev->vid, rdev->did, num_ports);
756 for (port_num = 0; port_num < num_ports; port_num++) {
757 if (rio_get_swpinfo_inport(port, destid, hopcount) ==
758 port_num)
759 continue;
760
761 if (rio_sport_is_active
762 (port, destid, hopcount, port_num)) {
763 pr_debug(
764 "RIO: scanning device on port %d\n",
765 port_num);
Zhang Weie0423232008-04-18 13:33:42 -0700766 for (ndestid = 0;
767 ndestid < RIO_ANY_DESTID(port->sys_size);
Matt Portereb188d02005-11-07 01:00:17 -0800768 ndestid++) {
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800769 rio_route_get_entry(port, rdev->rswitch,
Matt Portereb188d02005-11-07 01:00:17 -0800770 RIO_GLOBAL_TABLE,
771 ndestid,
772 &route_port);
773 if (route_port == port_num)
774 break;
775 }
776
777 if (rio_disc_peer
778 (net, port, ndestid, hopcount + 1) < 0)
779 return -1;
780 }
781 }
782 } else
783 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
784 rio_name(rdev), rdev->vid, rdev->did);
785
786 return 0;
787}
788
789/**
790 * rio_mport_is_active- Tests if master port link is active
791 * @port: Master port to test
792 *
793 * Reads the port error status CSR for the master port to
794 * determine if the port has an active link. Returns
795 * %PORT_N_ERR_STS_PORT_OK if the master port is active
796 * or %0 if it is inactive.
797 */
798static int rio_mport_is_active(struct rio_mport *port)
799{
800 u32 result = 0;
801 u32 ext_ftr_ptr;
802 int *entry = rio_mport_phys_table;
803
804 do {
805 if ((ext_ftr_ptr =
806 rio_mport_get_feature(port, 1, 0, 0, *entry)))
807 break;
808 } while (*++entry >= 0);
809
810 if (ext_ftr_ptr)
811 rio_local_read_config_32(port,
812 ext_ftr_ptr +
813 RIO_PORT_N_ERR_STS_CSR(port->index),
814 &result);
815
816 return (result & PORT_N_ERR_STS_PORT_OK);
817}
818
819/**
820 * rio_alloc_net- Allocate and configure a new RIO network
821 * @port: Master port associated with the RIO network
822 *
823 * Allocates a RIO network structure, initializes per-network
824 * list heads, and adds the associated master port to the
825 * network list of associated master ports. Returns a
826 * RIO network pointer on success or %NULL on failure.
827 */
828static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
829{
830 struct rio_net *net;
831
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700832 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
Matt Portereb188d02005-11-07 01:00:17 -0800833 if (net) {
Matt Portereb188d02005-11-07 01:00:17 -0800834 INIT_LIST_HEAD(&net->node);
835 INIT_LIST_HEAD(&net->devices);
836 INIT_LIST_HEAD(&net->mports);
837 list_add_tail(&port->nnode, &net->mports);
838 net->hport = port;
839 net->id = next_net++;
840 }
841 return net;
842}
843
844/**
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800845 * rio_update_route_tables- Updates route tables in switches
846 * @port: Master port associated with the RIO network
847 *
848 * For each enumerated device, ensure that each switch in a system
849 * has correct routing entries. Add routes for devices that where
850 * unknown dirung the first enumeration pass through the switch.
851 */
852static void rio_update_route_tables(struct rio_mport *port)
853{
854 struct rio_dev *rdev;
855 struct rio_switch *rswitch;
856 u8 sport;
857 u16 destid;
858
859 list_for_each_entry(rdev, &rio_devices, global_list) {
860
861 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
862
863 list_for_each_entry(rswitch, &rio_switches, node) {
864
865 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
866 continue;
867
868 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
869
870 sport = rio_get_swpinfo_inport(port,
871 rswitch->destid, rswitch->hopcount);
872
873 if (rswitch->add_entry) {
874 rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport);
875 rswitch->route_table[destid] = sport;
876 }
877 }
878 }
879 }
880}
881
882/**
Matt Portereb188d02005-11-07 01:00:17 -0800883 * rio_enum_mport- Start enumeration through a master port
884 * @mport: Master port to send transactions
885 *
886 * Starts the enumeration process. If somebody has enumerated our
887 * master port device, then give up. If not and we have an active
888 * link, then start recursive peer enumeration. Returns %0 if
889 * enumeration succeeds or %-EBUSY if enumeration fails.
890 */
Al Viro37d33d12008-11-22 17:36:24 +0000891int __devinit rio_enum_mport(struct rio_mport *mport)
Matt Portereb188d02005-11-07 01:00:17 -0800892{
893 struct rio_net *net = NULL;
894 int rc = 0;
895
896 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
897 mport->name);
898 /* If somebody else enumerated our master port device, bail. */
899 if (rio_enum_host(mport) < 0) {
900 printk(KERN_INFO
901 "RIO: master port %d device has been enumerated by a remote host\n",
902 mport->id);
903 rc = -EBUSY;
904 goto out;
905 }
906
907 /* If master port has an active link, allocate net and enum peers */
908 if (rio_mport_is_active(mport)) {
909 if (!(net = rio_alloc_net(mport))) {
910 printk(KERN_ERR "RIO: failed to allocate new net\n");
911 rc = -ENOMEM;
912 goto out;
913 }
914 if (rio_enum_peer(net, mport, 0) < 0) {
915 /* A higher priority host won enumeration, bail. */
916 printk(KERN_INFO
917 "RIO: master port %d device has lost enumeration to a remote host\n",
918 mport->id);
919 rio_clear_locks(mport);
920 rc = -EBUSY;
921 goto out;
922 }
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800923 rio_update_route_tables(mport);
Matt Portereb188d02005-11-07 01:00:17 -0800924 rio_clear_locks(mport);
925 } else {
926 printk(KERN_INFO "RIO: master port %d link inactive\n",
927 mport->id);
928 rc = -EINVAL;
929 }
930
931 out:
932 return rc;
933}
934
935/**
936 * rio_build_route_tables- Generate route tables from switch route entries
937 *
938 * For each switch device, generate a route table by copying existing
939 * route entries from the switch.
940 */
941static void rio_build_route_tables(void)
942{
943 struct rio_dev *rdev;
944 int i;
945 u8 sport;
946
947 list_for_each_entry(rdev, &rio_devices, global_list)
948 if (rio_is_switch(rdev))
Zhang Weie0423232008-04-18 13:33:42 -0700949 for (i = 0;
950 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
951 i++) {
Matt Portereb188d02005-11-07 01:00:17 -0800952 if (rio_route_get_entry
Alexandre Bouninec70555b2007-02-10 01:46:47 -0800953 (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE,
954 i, &sport) < 0)
Matt Portereb188d02005-11-07 01:00:17 -0800955 continue;
956 rdev->rswitch->route_table[i] = sport;
957 }
958}
959
960/**
961 * rio_enum_timeout- Signal that enumeration timed out
962 * @data: Address of timeout flag.
963 *
964 * When the enumeration complete timer expires, set a flag that
965 * signals to the discovery process that enumeration did not
966 * complete in a sane amount of time.
967 */
968static void rio_enum_timeout(unsigned long data)
969{
970 /* Enumeration timed out, set flag */
971 *(int *)data = 1;
972}
973
974/**
975 * rio_disc_mport- Start discovery through a master port
976 * @mport: Master port to send transactions
977 *
978 * Starts the discovery process. If we have an active link,
979 * then wait for the signal that enumeration is complete.
980 * When enumeration completion is signaled, start recursive
981 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
982 * on failure.
983 */
Al Viro37d33d12008-11-22 17:36:24 +0000984int __devinit rio_disc_mport(struct rio_mport *mport)
Matt Portereb188d02005-11-07 01:00:17 -0800985{
986 struct rio_net *net = NULL;
987 int enum_timeout_flag = 0;
988
989 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
990 mport->name);
991
992 /* If master port has an active link, allocate net and discover peers */
993 if (rio_mport_is_active(mport)) {
994 if (!(net = rio_alloc_net(mport))) {
995 printk(KERN_ERR "RIO: Failed to allocate new net\n");
996 goto bail;
997 }
998
999 pr_debug("RIO: wait for enumeration complete...");
1000
1001 rio_enum_timer.expires =
1002 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1003 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1004 add_timer(&rio_enum_timer);
1005 while (!rio_enum_complete(mport)) {
1006 mdelay(1);
1007 if (enum_timeout_flag) {
1008 del_timer_sync(&rio_enum_timer);
1009 goto timeout;
1010 }
1011 }
1012 del_timer_sync(&rio_enum_timer);
1013
1014 pr_debug("done\n");
Zhang Weie0423232008-04-18 13:33:42 -07001015 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1016 0) < 0) {
Matt Portereb188d02005-11-07 01:00:17 -08001017 printk(KERN_INFO
1018 "RIO: master port %d device has failed discovery\n",
1019 mport->id);
1020 goto bail;
1021 }
1022
1023 rio_build_route_tables();
1024 }
1025
1026 return 0;
1027
1028 timeout:
1029 pr_debug("timeout\n");
1030 bail:
1031 return -EBUSY;
1032}