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eb188d0e MP |
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/config.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/kernel.h> | |
16 | ||
17 | #include <linux/delay.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/rio.h> | |
20 | #include <linux/rio_drv.h> | |
21 | #include <linux/rio_ids.h> | |
22 | #include <linux/rio_regs.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/timer.h> | |
26 | ||
27 | #include "rio.h" | |
28 | ||
29 | LIST_HEAD(rio_devices); | |
30 | static LIST_HEAD(rio_switches); | |
31 | ||
32 | #define RIO_ENUM_CMPL_MAGIC 0xdeadbeef | |
33 | ||
34 | static void rio_enum_timeout(unsigned long); | |
35 | ||
36 | spinlock_t rio_global_list_lock = SPIN_LOCK_UNLOCKED; | |
37 | static int next_destid = 0; | |
38 | static int next_switchid = 0; | |
39 | static int next_net = 0; | |
40 | ||
41 | static struct timer_list rio_enum_timer = | |
42 | TIMER_INITIALIZER(rio_enum_timeout, 0, 0); | |
43 | ||
44 | static int rio_mport_phys_table[] = { | |
45 | RIO_EFB_PAR_EP_ID, | |
46 | RIO_EFB_PAR_EP_REC_ID, | |
47 | RIO_EFB_SER_EP_ID, | |
48 | RIO_EFB_SER_EP_REC_ID, | |
49 | -1, | |
50 | }; | |
51 | ||
52 | static int rio_sport_phys_table[] = { | |
53 | RIO_EFB_PAR_EP_FREE_ID, | |
54 | RIO_EFB_SER_EP_FREE_ID, | |
55 | -1, | |
56 | }; | |
57 | ||
58 | extern struct rio_route_ops __start_rio_route_ops[]; | |
59 | extern struct rio_route_ops __end_rio_route_ops[]; | |
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 | */ | |
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(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 | */ | |
88 | static void | |
89 | rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) | |
90 | { | |
91 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
92 | RIO_SET_DID(did)); | |
93 | } | |
94 | ||
95 | /** | |
96 | * rio_local_set_device_id - Set the base/extended device id for a port | |
97 | * @port: RIO master port | |
98 | * @did: Device ID value to be written | |
99 | * | |
100 | * Writes the base/extended device id from a device. | |
101 | */ | |
102 | static void rio_local_set_device_id(struct rio_mport *port, u16 did) | |
103 | { | |
104 | rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(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 | */ | |
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 | */ | |
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 | */ | |
192 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
193 | int dst_ops) | |
194 | { | |
195 | if (((src_ops & RIO_SRC_OPS_READ) || | |
196 | (src_ops & RIO_SRC_OPS_WRITE) || | |
197 | (src_ops & RIO_SRC_OPS_ATOMIC_TST_SWP) || | |
198 | (src_ops & RIO_SRC_OPS_ATOMIC_INC) || | |
199 | (src_ops & RIO_SRC_OPS_ATOMIC_DEC) || | |
200 | (src_ops & RIO_SRC_OPS_ATOMIC_SET) || | |
201 | (src_ops & RIO_SRC_OPS_ATOMIC_CLR)) && | |
202 | ((dst_ops & RIO_DST_OPS_READ) || | |
203 | (dst_ops & RIO_DST_OPS_WRITE) || | |
204 | (dst_ops & RIO_DST_OPS_ATOMIC_TST_SWP) || | |
205 | (dst_ops & RIO_DST_OPS_ATOMIC_INC) || | |
206 | (dst_ops & RIO_DST_OPS_ATOMIC_DEC) || | |
207 | (dst_ops & RIO_DST_OPS_ATOMIC_SET) || | |
208 | (dst_ops & RIO_DST_OPS_ATOMIC_CLR))) { | |
209 | return 1; | |
210 | } else | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /** | |
215 | * rio_release_dev- Frees a RIO device struct | |
216 | * @dev: LDM device associated with a RIO device struct | |
217 | * | |
218 | * Gets the RIO device struct associated a RIO device struct. | |
219 | * The RIO device struct is freed. | |
220 | */ | |
221 | static void rio_release_dev(struct device *dev) | |
222 | { | |
223 | struct rio_dev *rdev; | |
224 | ||
225 | rdev = to_rio_dev(dev); | |
226 | kfree(rdev); | |
227 | } | |
228 | ||
229 | /** | |
230 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
231 | * @rdev: RIO device | |
232 | * | |
233 | * Gets the RIO device Processing Element Features register | |
234 | * contents and tests for switch capabilities. Returns 1 if | |
235 | * the device is a switch or 0 if it is not a switch. | |
236 | * The RIO device struct is freed. | |
237 | */ | |
238 | static int rio_is_switch(struct rio_dev *rdev) | |
239 | { | |
240 | if (rdev->pef & RIO_PEF_SWITCH) | |
241 | return 1; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /** | |
246 | * rio_route_set_ops- Sets routing operations for a particular vendor switch | |
247 | * @rdev: RIO device | |
248 | * | |
249 | * Searches the RIO route ops table for known switch types. If the vid | |
250 | * and did match a switch table entry, then set the add_entry() and | |
251 | * get_entry() ops to the table entry values. | |
252 | */ | |
253 | static void rio_route_set_ops(struct rio_dev *rdev) | |
254 | { | |
255 | struct rio_route_ops *cur = __start_rio_route_ops; | |
256 | struct rio_route_ops *end = __end_rio_route_ops; | |
257 | ||
258 | while (cur < end) { | |
259 | if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { | |
260 | pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev)); | |
261 | rdev->rswitch->add_entry = cur->add_hook; | |
262 | rdev->rswitch->get_entry = cur->get_hook; | |
263 | } | |
264 | cur++; | |
265 | } | |
266 | ||
267 | if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) | |
268 | printk(KERN_ERR "RIO: missing routing ops for %s\n", | |
269 | rio_name(rdev)); | |
270 | } | |
271 | ||
272 | /** | |
273 | * rio_add_device- Adds a RIO device to the device model | |
274 | * @rdev: RIO device | |
275 | * | |
276 | * Adds the RIO device to the global device list and adds the RIO | |
277 | * device to the RIO device list. Creates the generic sysfs nodes | |
278 | * for an RIO device. | |
279 | */ | |
280 | static void __devinit rio_add_device(struct rio_dev *rdev) | |
281 | { | |
282 | device_add(&rdev->dev); | |
283 | ||
284 | spin_lock(&rio_global_list_lock); | |
285 | list_add_tail(&rdev->global_list, &rio_devices); | |
286 | spin_unlock(&rio_global_list_lock); | |
287 | ||
288 | rio_create_sysfs_dev_files(rdev); | |
289 | } | |
290 | ||
291 | /** | |
292 | * rio_setup_device- Allocates and sets up a RIO device | |
293 | * @net: RIO network | |
294 | * @port: Master port to send transactions | |
295 | * @destid: Current destination ID | |
296 | * @hopcount: Current hopcount | |
297 | * @do_enum: Enumeration/Discovery mode flag | |
298 | * | |
299 | * Allocates a RIO device and configures fields based on configuration | |
300 | * space contents. If device has a destination ID register, a destination | |
301 | * ID is either assigned in enumeration mode or read from configuration | |
302 | * space in discovery mode. If the device has switch capabilities, then | |
303 | * a switch is allocated and configured appropriately. Returns a pointer | |
304 | * to a RIO device on success or NULL on failure. | |
305 | * | |
306 | */ | |
307 | static struct rio_dev *rio_setup_device(struct rio_net *net, | |
308 | struct rio_mport *port, u16 destid, | |
309 | u8 hopcount, int do_enum) | |
310 | { | |
311 | struct rio_dev *rdev; | |
312 | struct rio_switch *rswitch; | |
313 | int result, rdid; | |
314 | ||
315 | rdev = kmalloc(sizeof(struct rio_dev), GFP_KERNEL); | |
316 | if (!rdev) | |
317 | goto out; | |
318 | ||
319 | memset(rdev, 0, sizeof(struct rio_dev)); | |
320 | rdev->net = net; | |
321 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, | |
322 | &result); | |
323 | rdev->did = result >> 16; | |
324 | rdev->vid = result & 0xffff; | |
325 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, | |
326 | &rdev->device_rev); | |
327 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, | |
328 | &result); | |
329 | rdev->asm_did = result >> 16; | |
330 | rdev->asm_vid = result & 0xffff; | |
331 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, | |
332 | &result); | |
333 | rdev->asm_rev = result >> 16; | |
334 | rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR, | |
335 | &rdev->pef); | |
336 | if (rdev->pef & RIO_PEF_EXT_FEATURES) | |
337 | rdev->efptr = result & 0xffff; | |
338 | ||
339 | rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, | |
340 | &rdev->src_ops); | |
341 | rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, | |
342 | &rdev->dst_ops); | |
343 | ||
344 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops) | |
345 | && do_enum) { | |
346 | rio_set_device_id(port, destid, hopcount, next_destid); | |
347 | rdev->destid = next_destid++; | |
348 | if (next_destid == port->host_deviceid) | |
349 | next_destid++; | |
350 | } else | |
351 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
352 | ||
353 | /* If a PE has both switch and other functions, show it as a switch */ | |
354 | if (rio_is_switch(rdev)) { | |
355 | rio_mport_read_config_32(port, destid, hopcount, | |
356 | RIO_SWP_INFO_CAR, &rdev->swpinfo); | |
357 | rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL); | |
358 | if (!rswitch) { | |
359 | kfree(rdev); | |
360 | rdev = NULL; | |
361 | goto out; | |
362 | } | |
363 | rswitch->switchid = next_switchid; | |
364 | rswitch->hopcount = hopcount; | |
365 | rswitch->destid = 0xffff; | |
366 | /* Initialize switch route table */ | |
367 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++) | |
368 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; | |
369 | rdev->rswitch = rswitch; | |
370 | sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id, | |
371 | rdev->rswitch->switchid); | |
372 | rio_route_set_ops(rdev); | |
373 | ||
374 | list_add_tail(&rswitch->node, &rio_switches); | |
375 | ||
376 | } else | |
377 | sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id, | |
378 | rdev->destid); | |
379 | ||
380 | rdev->dev.bus = &rio_bus_type; | |
381 | ||
382 | device_initialize(&rdev->dev); | |
383 | rdev->dev.release = rio_release_dev; | |
384 | rio_dev_get(rdev); | |
385 | ||
386 | rdev->dev.dma_mask = (u64 *) 0xffffffff; | |
387 | rdev->dev.coherent_dma_mask = 0xffffffffULL; | |
388 | ||
389 | if ((rdev->pef & RIO_PEF_INB_DOORBELL) && | |
390 | (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) | |
391 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], | |
392 | 0, 0xffff); | |
393 | ||
394 | rio_add_device(rdev); | |
395 | ||
396 | out: | |
397 | return rdev; | |
398 | } | |
399 | ||
400 | /** | |
401 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
402 | * @port: Master port to send transaction | |
403 | * @destid: Associated destination ID for switch | |
404 | * @hopcount: Hopcount to reach switch | |
405 | * @sport: Switch port number | |
406 | * | |
407 | * Reads the port error status CSR for a particular switch port to | |
408 | * determine if the port has an active link. Returns | |
409 | * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is | |
410 | * inactive. | |
411 | */ | |
412 | static int | |
413 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
414 | { | |
415 | u32 result; | |
416 | u32 ext_ftr_ptr; | |
417 | ||
418 | int *entry = rio_sport_phys_table; | |
419 | ||
420 | do { | |
421 | if ((ext_ftr_ptr = | |
422 | rio_mport_get_feature(port, 0, destid, hopcount, *entry))) | |
423 | ||
424 | break; | |
425 | } while (*++entry >= 0); | |
426 | ||
427 | if (ext_ftr_ptr) | |
428 | rio_mport_read_config_32(port, destid, hopcount, | |
429 | ext_ftr_ptr + | |
430 | RIO_PORT_N_ERR_STS_CSR(sport), | |
431 | &result); | |
432 | ||
433 | return (result & PORT_N_ERR_STS_PORT_OK); | |
434 | } | |
435 | ||
436 | /** | |
437 | * rio_route_add_entry- Add a route entry to a switch routing table | |
438 | * @mport: Master port to send transaction | |
439 | * @rdev: Switch device | |
440 | * @table: Routing table ID | |
441 | * @route_destid: Destination ID to be routed | |
442 | * @route_port: Port number to be routed | |
443 | * | |
444 | * Calls the switch specific add_entry() method to add a route entry | |
445 | * on a switch. The route table can be specified using the @table | |
446 | * argument if a switch has per port routing tables or the normal | |
447 | * use is to specific all tables (or the global table) by passing | |
448 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
449 | * on failure. | |
450 | */ | |
451 | static int rio_route_add_entry(struct rio_mport *mport, struct rio_dev *rdev, | |
452 | u16 table, u16 route_destid, u8 route_port) | |
453 | { | |
454 | return rdev->rswitch->add_entry(mport, rdev->rswitch->destid, | |
455 | rdev->rswitch->hopcount, table, | |
456 | route_destid, route_port); | |
457 | } | |
458 | ||
459 | /** | |
460 | * rio_route_get_entry- Read a route entry in a switch routing table | |
461 | * @mport: Master port to send transaction | |
462 | * @rdev: Switch device | |
463 | * @table: Routing table ID | |
464 | * @route_destid: Destination ID to be routed | |
465 | * @route_port: Pointer to read port number into | |
466 | * | |
467 | * Calls the switch specific get_entry() method to read a route entry | |
468 | * in a switch. The route table can be specified using the @table | |
469 | * argument if a switch has per port routing tables or the normal | |
470 | * use is to specific all tables (or the global table) by passing | |
471 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
472 | * on failure. | |
473 | */ | |
474 | static int | |
475 | rio_route_get_entry(struct rio_mport *mport, struct rio_dev *rdev, u16 table, | |
476 | u16 route_destid, u8 * route_port) | |
477 | { | |
478 | return rdev->rswitch->get_entry(mport, rdev->rswitch->destid, | |
479 | rdev->rswitch->hopcount, table, | |
480 | route_destid, route_port); | |
481 | } | |
482 | ||
483 | /** | |
484 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
485 | * @port: Master port to send transaction | |
486 | * @hopcount: Number of hops to the device | |
487 | * | |
488 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
489 | * RIO device. Returns the value of the lock register. | |
490 | */ | |
491 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
492 | { | |
493 | u32 result; | |
494 | ||
495 | rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount, | |
496 | RIO_HOST_DID_LOCK_CSR, &result); | |
497 | ||
498 | return (u16) (result & 0xffff); | |
499 | } | |
500 | ||
501 | /** | |
502 | * rio_get_swpinfo_inport- Gets the ingress port number | |
503 | * @mport: Master port to send transaction | |
504 | * @destid: Destination ID associated with the switch | |
505 | * @hopcount: Number of hops to the device | |
506 | * | |
507 | * Returns port number being used to access the switch device. | |
508 | */ | |
509 | static u8 | |
510 | rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount) | |
511 | { | |
512 | u32 result; | |
513 | ||
514 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
515 | &result); | |
516 | ||
517 | return (u8) (result & 0xff); | |
518 | } | |
519 | ||
520 | /** | |
521 | * rio_get_swpinfo_tports- Gets total number of ports on the switch | |
522 | * @mport: Master port to send transaction | |
523 | * @destid: Destination ID associated with the switch | |
524 | * @hopcount: Number of hops to the device | |
525 | * | |
526 | * Returns total numbers of ports implemented by the switch device. | |
527 | */ | |
528 | static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid, | |
529 | u8 hopcount) | |
530 | { | |
531 | u32 result; | |
532 | ||
533 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
534 | &result); | |
535 | ||
536 | return RIO_GET_TOTAL_PORTS(result); | |
537 | } | |
538 | ||
539 | /** | |
540 | * rio_net_add_mport- Add a master port to a RIO network | |
541 | * @net: RIO network | |
542 | * @port: Master port to add | |
543 | * | |
544 | * Adds a master port to the network list of associated master | |
545 | * ports.. | |
546 | */ | |
547 | static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port) | |
548 | { | |
549 | spin_lock(&rio_global_list_lock); | |
550 | list_add_tail(&port->nnode, &net->mports); | |
551 | spin_unlock(&rio_global_list_lock); | |
552 | } | |
553 | ||
554 | /** | |
555 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
556 | * @net: RIO network being enumerated | |
557 | * @port: Master port to send transactions | |
558 | * @hopcount: Number of hops into the network | |
559 | * | |
560 | * Recursively enumerates a RIO network. Transactions are sent via the | |
561 | * master port passed in @port. | |
562 | */ | |
563 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, | |
564 | u8 hopcount) | |
565 | { | |
566 | int port_num; | |
567 | int num_ports; | |
568 | int cur_destid; | |
569 | struct rio_dev *rdev; | |
570 | u16 destid; | |
571 | int tmp; | |
572 | ||
573 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { | |
574 | pr_debug("RIO: PE already discovered by this host\n"); | |
575 | /* | |
576 | * Already discovered by this host. Add it as another | |
577 | * master port for the current network. | |
578 | */ | |
579 | rio_net_add_mport(net, port); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | /* Attempt to acquire device lock */ | |
584 | rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, | |
585 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); | |
586 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
587 | < port->host_deviceid) { | |
588 | /* Delay a bit */ | |
589 | mdelay(1); | |
590 | /* Attempt to acquire device lock again */ | |
591 | rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, | |
592 | RIO_HOST_DID_LOCK_CSR, | |
593 | port->host_deviceid); | |
594 | } | |
595 | ||
596 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
597 | pr_debug( | |
598 | "RIO: PE locked by a higher priority host...retreating\n"); | |
599 | return -1; | |
600 | } | |
601 | ||
602 | /* Setup new RIO device */ | |
603 | if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) { | |
604 | /* Add device to the global and bus/net specific list. */ | |
605 | list_add_tail(&rdev->net_list, &net->devices); | |
606 | } else | |
607 | return -1; | |
608 | ||
609 | if (rio_is_switch(rdev)) { | |
610 | next_switchid++; | |
611 | ||
612 | for (destid = 0; destid < next_destid; destid++) { | |
613 | rio_route_add_entry(port, rdev, RIO_GLOBAL_TABLE, | |
614 | destid, rio_get_swpinfo_inport(port, | |
615 | RIO_ANY_DESTID, | |
616 | hopcount)); | |
617 | rdev->rswitch->route_table[destid] = | |
618 | rio_get_swpinfo_inport(port, RIO_ANY_DESTID, | |
619 | hopcount); | |
620 | } | |
621 | ||
622 | num_ports = | |
623 | rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount); | |
624 | pr_debug( | |
625 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
626 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
627 | for (port_num = 0; port_num < num_ports; port_num++) { | |
628 | if (rio_get_swpinfo_inport | |
629 | (port, RIO_ANY_DESTID, hopcount) == port_num) | |
630 | continue; | |
631 | ||
632 | cur_destid = next_destid; | |
633 | ||
634 | if (rio_sport_is_active | |
635 | (port, RIO_ANY_DESTID, hopcount, port_num)) { | |
636 | pr_debug( | |
637 | "RIO: scanning device on port %d\n", | |
638 | port_num); | |
639 | rio_route_add_entry(port, rdev, | |
640 | RIO_GLOBAL_TABLE, | |
641 | RIO_ANY_DESTID, port_num); | |
642 | ||
643 | if (rio_enum_peer(net, port, hopcount + 1) < 0) | |
644 | return -1; | |
645 | ||
646 | /* Update routing tables */ | |
647 | if (next_destid > cur_destid) { | |
648 | for (destid = cur_destid; | |
649 | destid < next_destid; destid++) { | |
650 | rio_route_add_entry(port, rdev, | |
651 | RIO_GLOBAL_TABLE, | |
652 | destid, | |
653 | port_num); | |
654 | rdev->rswitch-> | |
655 | route_table[destid] = | |
656 | port_num; | |
657 | } | |
658 | rdev->rswitch->destid = cur_destid; | |
659 | } | |
660 | } | |
661 | } | |
662 | } else | |
663 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
664 | rio_name(rdev), rdev->vid, rdev->did); | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | /** | |
670 | * rio_enum_complete- Tests if enumeration of a network is complete | |
671 | * @port: Master port to send transaction | |
672 | * | |
673 | * Tests the Component Tag CSR for presence of the magic enumeration | |
674 | * complete flag. Return %1 if enumeration is complete or %0 if | |
675 | * enumeration is incomplete. | |
676 | */ | |
677 | static int rio_enum_complete(struct rio_mport *port) | |
678 | { | |
679 | u32 tag_csr; | |
680 | int ret = 0; | |
681 | ||
682 | rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); | |
683 | ||
684 | if (tag_csr == RIO_ENUM_CMPL_MAGIC) | |
685 | ret = 1; | |
686 | ||
687 | return ret; | |
688 | } | |
689 | ||
690 | /** | |
691 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
692 | * @net: RIO network being discovered | |
693 | * @port: Master port to send transactions | |
694 | * @destid: Current destination ID in network | |
695 | * @hopcount: Number of hops into the network | |
696 | * | |
697 | * Recursively discovers a RIO network. Transactions are sent via the | |
698 | * master port passed in @port. | |
699 | */ | |
700 | static int | |
701 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, | |
702 | u8 hopcount) | |
703 | { | |
704 | u8 port_num, route_port; | |
705 | int num_ports; | |
706 | struct rio_dev *rdev; | |
707 | u16 ndestid; | |
708 | ||
709 | /* Setup new RIO device */ | |
710 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
711 | /* Add device to the global and bus/net specific list. */ | |
712 | list_add_tail(&rdev->net_list, &net->devices); | |
713 | } else | |
714 | return -1; | |
715 | ||
716 | if (rio_is_switch(rdev)) { | |
717 | next_switchid++; | |
718 | ||
719 | /* Associated destid is how we accessed this switch */ | |
720 | rdev->rswitch->destid = destid; | |
721 | ||
722 | num_ports = rio_get_swpinfo_tports(port, destid, hopcount); | |
723 | pr_debug( | |
724 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
725 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
726 | for (port_num = 0; port_num < num_ports; port_num++) { | |
727 | if (rio_get_swpinfo_inport(port, destid, hopcount) == | |
728 | port_num) | |
729 | continue; | |
730 | ||
731 | if (rio_sport_is_active | |
732 | (port, destid, hopcount, port_num)) { | |
733 | pr_debug( | |
734 | "RIO: scanning device on port %d\n", | |
735 | port_num); | |
736 | for (ndestid = 0; ndestid < RIO_ANY_DESTID; | |
737 | ndestid++) { | |
738 | rio_route_get_entry(port, rdev, | |
739 | RIO_GLOBAL_TABLE, | |
740 | ndestid, | |
741 | &route_port); | |
742 | if (route_port == port_num) | |
743 | break; | |
744 | } | |
745 | ||
746 | if (rio_disc_peer | |
747 | (net, port, ndestid, hopcount + 1) < 0) | |
748 | return -1; | |
749 | } | |
750 | } | |
751 | } else | |
752 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
753 | rio_name(rdev), rdev->vid, rdev->did); | |
754 | ||
755 | return 0; | |
756 | } | |
757 | ||
758 | /** | |
759 | * rio_mport_is_active- Tests if master port link is active | |
760 | * @port: Master port to test | |
761 | * | |
762 | * Reads the port error status CSR for the master port to | |
763 | * determine if the port has an active link. Returns | |
764 | * %PORT_N_ERR_STS_PORT_OK if the master port is active | |
765 | * or %0 if it is inactive. | |
766 | */ | |
767 | static int rio_mport_is_active(struct rio_mport *port) | |
768 | { | |
769 | u32 result = 0; | |
770 | u32 ext_ftr_ptr; | |
771 | int *entry = rio_mport_phys_table; | |
772 | ||
773 | do { | |
774 | if ((ext_ftr_ptr = | |
775 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
776 | break; | |
777 | } while (*++entry >= 0); | |
778 | ||
779 | if (ext_ftr_ptr) | |
780 | rio_local_read_config_32(port, | |
781 | ext_ftr_ptr + | |
782 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
783 | &result); | |
784 | ||
785 | return (result & PORT_N_ERR_STS_PORT_OK); | |
786 | } | |
787 | ||
788 | /** | |
789 | * rio_alloc_net- Allocate and configure a new RIO network | |
790 | * @port: Master port associated with the RIO network | |
791 | * | |
792 | * Allocates a RIO network structure, initializes per-network | |
793 | * list heads, and adds the associated master port to the | |
794 | * network list of associated master ports. Returns a | |
795 | * RIO network pointer on success or %NULL on failure. | |
796 | */ | |
797 | static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) | |
798 | { | |
799 | struct rio_net *net; | |
800 | ||
801 | net = kmalloc(sizeof(struct rio_net), GFP_KERNEL); | |
802 | if (net) { | |
803 | memset(net, 0, sizeof(struct rio_net)); | |
804 | INIT_LIST_HEAD(&net->node); | |
805 | INIT_LIST_HEAD(&net->devices); | |
806 | INIT_LIST_HEAD(&net->mports); | |
807 | list_add_tail(&port->nnode, &net->mports); | |
808 | net->hport = port; | |
809 | net->id = next_net++; | |
810 | } | |
811 | return net; | |
812 | } | |
813 | ||
814 | /** | |
815 | * rio_enum_mport- Start enumeration through a master port | |
816 | * @mport: Master port to send transactions | |
817 | * | |
818 | * Starts the enumeration process. If somebody has enumerated our | |
819 | * master port device, then give up. If not and we have an active | |
820 | * link, then start recursive peer enumeration. Returns %0 if | |
821 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
822 | */ | |
823 | int rio_enum_mport(struct rio_mport *mport) | |
824 | { | |
825 | struct rio_net *net = NULL; | |
826 | int rc = 0; | |
827 | ||
828 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
829 | mport->name); | |
830 | /* If somebody else enumerated our master port device, bail. */ | |
831 | if (rio_enum_host(mport) < 0) { | |
832 | printk(KERN_INFO | |
833 | "RIO: master port %d device has been enumerated by a remote host\n", | |
834 | mport->id); | |
835 | rc = -EBUSY; | |
836 | goto out; | |
837 | } | |
838 | ||
839 | /* If master port has an active link, allocate net and enum peers */ | |
840 | if (rio_mport_is_active(mport)) { | |
841 | if (!(net = rio_alloc_net(mport))) { | |
842 | printk(KERN_ERR "RIO: failed to allocate new net\n"); | |
843 | rc = -ENOMEM; | |
844 | goto out; | |
845 | } | |
846 | if (rio_enum_peer(net, mport, 0) < 0) { | |
847 | /* A higher priority host won enumeration, bail. */ | |
848 | printk(KERN_INFO | |
849 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
850 | mport->id); | |
851 | rio_clear_locks(mport); | |
852 | rc = -EBUSY; | |
853 | goto out; | |
854 | } | |
855 | rio_clear_locks(mport); | |
856 | } else { | |
857 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
858 | mport->id); | |
859 | rc = -EINVAL; | |
860 | } | |
861 | ||
862 | out: | |
863 | return rc; | |
864 | } | |
865 | ||
866 | /** | |
867 | * rio_build_route_tables- Generate route tables from switch route entries | |
868 | * | |
869 | * For each switch device, generate a route table by copying existing | |
870 | * route entries from the switch. | |
871 | */ | |
872 | static void rio_build_route_tables(void) | |
873 | { | |
874 | struct rio_dev *rdev; | |
875 | int i; | |
876 | u8 sport; | |
877 | ||
878 | list_for_each_entry(rdev, &rio_devices, global_list) | |
879 | if (rio_is_switch(rdev)) | |
880 | for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) { | |
881 | if (rio_route_get_entry | |
882 | (rdev->net->hport, rdev, RIO_GLOBAL_TABLE, i, | |
883 | &sport) < 0) | |
884 | continue; | |
885 | rdev->rswitch->route_table[i] = sport; | |
886 | } | |
887 | } | |
888 | ||
889 | /** | |
890 | * rio_enum_timeout- Signal that enumeration timed out | |
891 | * @data: Address of timeout flag. | |
892 | * | |
893 | * When the enumeration complete timer expires, set a flag that | |
894 | * signals to the discovery process that enumeration did not | |
895 | * complete in a sane amount of time. | |
896 | */ | |
897 | static void rio_enum_timeout(unsigned long data) | |
898 | { | |
899 | /* Enumeration timed out, set flag */ | |
900 | *(int *)data = 1; | |
901 | } | |
902 | ||
903 | /** | |
904 | * rio_disc_mport- Start discovery through a master port | |
905 | * @mport: Master port to send transactions | |
906 | * | |
907 | * Starts the discovery process. If we have an active link, | |
908 | * then wait for the signal that enumeration is complete. | |
909 | * When enumeration completion is signaled, start recursive | |
910 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
911 | * on failure. | |
912 | */ | |
913 | int rio_disc_mport(struct rio_mport *mport) | |
914 | { | |
915 | struct rio_net *net = NULL; | |
916 | int enum_timeout_flag = 0; | |
917 | ||
918 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
919 | mport->name); | |
920 | ||
921 | /* If master port has an active link, allocate net and discover peers */ | |
922 | if (rio_mport_is_active(mport)) { | |
923 | if (!(net = rio_alloc_net(mport))) { | |
924 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
925 | goto bail; | |
926 | } | |
927 | ||
928 | pr_debug("RIO: wait for enumeration complete..."); | |
929 | ||
930 | rio_enum_timer.expires = | |
931 | jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; | |
932 | rio_enum_timer.data = (unsigned long)&enum_timeout_flag; | |
933 | add_timer(&rio_enum_timer); | |
934 | while (!rio_enum_complete(mport)) { | |
935 | mdelay(1); | |
936 | if (enum_timeout_flag) { | |
937 | del_timer_sync(&rio_enum_timer); | |
938 | goto timeout; | |
939 | } | |
940 | } | |
941 | del_timer_sync(&rio_enum_timer); | |
942 | ||
943 | pr_debug("done\n"); | |
944 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) { | |
945 | printk(KERN_INFO | |
946 | "RIO: master port %d device has failed discovery\n", | |
947 | mport->id); | |
948 | goto bail; | |
949 | } | |
950 | ||
951 | rio_build_route_tables(); | |
952 | } | |
953 | ||
954 | return 0; | |
955 | ||
956 | timeout: | |
957 | pr_debug("timeout\n"); | |
958 | bail: | |
959 | return -EBUSY; | |
960 | } |