Commit | Line | Data |
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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> | |
fa78cc51 | 18 | #include <linux/dma-mapping.h> |
eb188d0e MP |
19 | #include <linux/init.h> |
20 | #include <linux/rio.h> | |
21 | #include <linux/rio_drv.h> | |
22 | #include <linux/rio_ids.h> | |
23 | #include <linux/rio_regs.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/timer.h> | |
27 | ||
28 | #include "rio.h" | |
29 | ||
30 | LIST_HEAD(rio_devices); | |
31 | static LIST_HEAD(rio_switches); | |
32 | ||
33 | #define RIO_ENUM_CMPL_MAGIC 0xdeadbeef | |
34 | ||
35 | static void rio_enum_timeout(unsigned long); | |
36 | ||
fa78cc51 MP |
37 | DEFINE_SPINLOCK(rio_global_list_lock); |
38 | ||
eb188d0e MP |
39 | static int next_destid = 0; |
40 | static int next_switchid = 0; | |
41 | static int next_net = 0; | |
42 | ||
43 | static struct timer_list rio_enum_timer = | |
44 | TIMER_INITIALIZER(rio_enum_timeout, 0, 0); | |
45 | ||
46 | static int rio_mport_phys_table[] = { | |
47 | RIO_EFB_PAR_EP_ID, | |
48 | RIO_EFB_PAR_EP_REC_ID, | |
49 | RIO_EFB_SER_EP_ID, | |
50 | RIO_EFB_SER_EP_REC_ID, | |
51 | -1, | |
52 | }; | |
53 | ||
54 | static int rio_sport_phys_table[] = { | |
55 | RIO_EFB_PAR_EP_FREE_ID, | |
56 | RIO_EFB_SER_EP_FREE_ID, | |
57 | -1, | |
58 | }; | |
59 | ||
eb188d0e MP |
60 | /** |
61 | * rio_get_device_id - Get the base/extended device id for a device | |
62 | * @port: RIO master port | |
63 | * @destid: Destination ID of device | |
64 | * @hopcount: Hopcount to device | |
65 | * | |
66 | * Reads the base/extended device id from a device. Returns the | |
67 | * 8/16-bit device ID. | |
68 | */ | |
69 | static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) | |
70 | { | |
71 | u32 result; | |
72 | ||
73 | rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); | |
74 | ||
75 | return RIO_GET_DID(result); | |
76 | } | |
77 | ||
78 | /** | |
79 | * rio_set_device_id - Set the base/extended device id for a device | |
80 | * @port: RIO master port | |
81 | * @destid: Destination ID of device | |
82 | * @hopcount: Hopcount to device | |
83 | * @did: Device ID value to be written | |
84 | * | |
85 | * Writes the base/extended device id from a device. | |
86 | */ | |
fa78cc51 | 87 | static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) |
eb188d0e MP |
88 | { |
89 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
90 | RIO_SET_DID(did)); | |
91 | } | |
92 | ||
93 | /** | |
94 | * rio_local_set_device_id - Set the base/extended device id for a port | |
95 | * @port: RIO master port | |
96 | * @did: Device ID value to be written | |
97 | * | |
98 | * Writes the base/extended device id from a device. | |
99 | */ | |
100 | static void rio_local_set_device_id(struct rio_mport *port, u16 did) | |
101 | { | |
102 | rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(did)); | |
103 | } | |
104 | ||
105 | /** | |
106 | * rio_clear_locks- Release all host locks and signal enumeration complete | |
107 | * @port: Master port to issue transaction | |
108 | * | |
109 | * Marks the component tag CSR on each device with the enumeration | |
110 | * complete flag. When complete, it then release the host locks on | |
111 | * each device. Returns 0 on success or %-EINVAL on failure. | |
112 | */ | |
113 | static int rio_clear_locks(struct rio_mport *port) | |
114 | { | |
115 | struct rio_dev *rdev; | |
116 | u32 result; | |
117 | int ret = 0; | |
118 | ||
119 | /* Write component tag CSR magic complete value */ | |
120 | rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, | |
121 | RIO_ENUM_CMPL_MAGIC); | |
122 | list_for_each_entry(rdev, &rio_devices, global_list) | |
123 | rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, | |
124 | RIO_ENUM_CMPL_MAGIC); | |
125 | ||
126 | /* Release host device id locks */ | |
127 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
128 | port->host_deviceid); | |
129 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
130 | if ((result & 0xffff) != 0xffff) { | |
131 | printk(KERN_INFO | |
132 | "RIO: badness when releasing host lock on master port, result %8.8x\n", | |
133 | result); | |
134 | ret = -EINVAL; | |
135 | } | |
136 | list_for_each_entry(rdev, &rio_devices, global_list) { | |
137 | rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, | |
138 | port->host_deviceid); | |
139 | rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); | |
140 | if ((result & 0xffff) != 0xffff) { | |
141 | printk(KERN_INFO | |
142 | "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", | |
143 | rdev->vid, rdev->did); | |
144 | ret = -EINVAL; | |
145 | } | |
146 | } | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | /** | |
152 | * rio_enum_host- Set host lock and initialize host destination ID | |
153 | * @port: Master port to issue transaction | |
154 | * | |
155 | * Sets the local host master port lock and destination ID register | |
156 | * with the host device ID value. The host device ID value is provided | |
157 | * by the platform. Returns %0 on success or %-1 on failure. | |
158 | */ | |
159 | static int rio_enum_host(struct rio_mport *port) | |
160 | { | |
161 | u32 result; | |
162 | ||
163 | /* Set master port host device id lock */ | |
164 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
165 | port->host_deviceid); | |
166 | ||
167 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
168 | if ((result & 0xffff) != port->host_deviceid) | |
169 | return -1; | |
170 | ||
171 | /* Set master port destid and init destid ctr */ | |
172 | rio_local_set_device_id(port, port->host_deviceid); | |
173 | ||
174 | if (next_destid == port->host_deviceid) | |
175 | next_destid++; | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /** | |
181 | * rio_device_has_destid- Test if a device contains a destination ID register | |
182 | * @port: Master port to issue transaction | |
183 | * @src_ops: RIO device source operations | |
184 | * @dst_ops: RIO device destination operations | |
185 | * | |
186 | * Checks the provided @src_ops and @dst_ops for the necessary transaction | |
187 | * capabilities that indicate whether or not a device will implement a | |
188 | * destination ID register. Returns 1 if true or 0 if false. | |
189 | */ | |
190 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
191 | int dst_ops) | |
192 | { | |
fa78cc51 MP |
193 | 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; |
194 | ||
195 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
196 | } |
197 | ||
198 | /** | |
199 | * rio_release_dev- Frees a RIO device struct | |
200 | * @dev: LDM device associated with a RIO device struct | |
201 | * | |
202 | * Gets the RIO device struct associated a RIO device struct. | |
203 | * The RIO device struct is freed. | |
204 | */ | |
205 | static void rio_release_dev(struct device *dev) | |
206 | { | |
207 | struct rio_dev *rdev; | |
208 | ||
209 | rdev = to_rio_dev(dev); | |
210 | kfree(rdev); | |
211 | } | |
212 | ||
213 | /** | |
214 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
215 | * @rdev: RIO device | |
216 | * | |
217 | * Gets the RIO device Processing Element Features register | |
218 | * contents and tests for switch capabilities. Returns 1 if | |
219 | * the device is a switch or 0 if it is not a switch. | |
220 | * The RIO device struct is freed. | |
221 | */ | |
222 | static int rio_is_switch(struct rio_dev *rdev) | |
223 | { | |
224 | if (rdev->pef & RIO_PEF_SWITCH) | |
225 | return 1; | |
226 | return 0; | |
227 | } | |
228 | ||
229 | /** | |
230 | * rio_route_set_ops- Sets routing operations for a particular vendor switch | |
231 | * @rdev: RIO device | |
232 | * | |
233 | * Searches the RIO route ops table for known switch types. If the vid | |
234 | * and did match a switch table entry, then set the add_entry() and | |
235 | * get_entry() ops to the table entry values. | |
236 | */ | |
237 | static void rio_route_set_ops(struct rio_dev *rdev) | |
238 | { | |
239 | struct rio_route_ops *cur = __start_rio_route_ops; | |
240 | struct rio_route_ops *end = __end_rio_route_ops; | |
241 | ||
242 | while (cur < end) { | |
243 | if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { | |
244 | pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev)); | |
245 | rdev->rswitch->add_entry = cur->add_hook; | |
246 | rdev->rswitch->get_entry = cur->get_hook; | |
247 | } | |
248 | cur++; | |
249 | } | |
250 | ||
251 | if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) | |
252 | printk(KERN_ERR "RIO: missing routing ops for %s\n", | |
253 | rio_name(rdev)); | |
254 | } | |
255 | ||
256 | /** | |
257 | * rio_add_device- Adds a RIO device to the device model | |
258 | * @rdev: RIO device | |
259 | * | |
260 | * Adds the RIO device to the global device list and adds the RIO | |
261 | * device to the RIO device list. Creates the generic sysfs nodes | |
262 | * for an RIO device. | |
263 | */ | |
264 | static void __devinit rio_add_device(struct rio_dev *rdev) | |
265 | { | |
266 | device_add(&rdev->dev); | |
267 | ||
268 | spin_lock(&rio_global_list_lock); | |
269 | list_add_tail(&rdev->global_list, &rio_devices); | |
270 | spin_unlock(&rio_global_list_lock); | |
271 | ||
272 | rio_create_sysfs_dev_files(rdev); | |
273 | } | |
274 | ||
275 | /** | |
276 | * rio_setup_device- Allocates and sets up a RIO device | |
277 | * @net: RIO network | |
278 | * @port: Master port to send transactions | |
279 | * @destid: Current destination ID | |
280 | * @hopcount: Current hopcount | |
281 | * @do_enum: Enumeration/Discovery mode flag | |
282 | * | |
283 | * Allocates a RIO device and configures fields based on configuration | |
284 | * space contents. If device has a destination ID register, a destination | |
285 | * ID is either assigned in enumeration mode or read from configuration | |
286 | * space in discovery mode. If the device has switch capabilities, then | |
287 | * a switch is allocated and configured appropriately. Returns a pointer | |
288 | * to a RIO device on success or NULL on failure. | |
289 | * | |
290 | */ | |
291 | static struct rio_dev *rio_setup_device(struct rio_net *net, | |
292 | struct rio_mport *port, u16 destid, | |
293 | u8 hopcount, int do_enum) | |
294 | { | |
295 | struct rio_dev *rdev; | |
296 | struct rio_switch *rswitch; | |
297 | int result, rdid; | |
298 | ||
299 | rdev = kmalloc(sizeof(struct rio_dev), GFP_KERNEL); | |
300 | if (!rdev) | |
301 | goto out; | |
302 | ||
303 | memset(rdev, 0, sizeof(struct rio_dev)); | |
304 | 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 | ||
328 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops) | |
329 | && 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); | |
336 | ||
337 | /* If a PE has both switch and other functions, show it as a switch */ | |
338 | if (rio_is_switch(rdev)) { | |
339 | rio_mport_read_config_32(port, destid, hopcount, | |
340 | RIO_SWP_INFO_CAR, &rdev->swpinfo); | |
341 | rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL); | |
342 | if (!rswitch) { | |
343 | kfree(rdev); | |
344 | rdev = NULL; | |
345 | goto out; | |
346 | } | |
347 | rswitch->switchid = next_switchid; | |
348 | rswitch->hopcount = hopcount; | |
349 | rswitch->destid = 0xffff; | |
350 | /* Initialize switch route table */ | |
351 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++) | |
352 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; | |
353 | rdev->rswitch = rswitch; | |
354 | sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id, | |
355 | rdev->rswitch->switchid); | |
356 | rio_route_set_ops(rdev); | |
357 | ||
358 | list_add_tail(&rswitch->node, &rio_switches); | |
359 | ||
360 | } else | |
361 | sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id, | |
362 | rdev->destid); | |
363 | ||
364 | rdev->dev.bus = &rio_bus_type; | |
365 | ||
366 | device_initialize(&rdev->dev); | |
367 | rdev->dev.release = rio_release_dev; | |
368 | rio_dev_get(rdev); | |
369 | ||
fa78cc51 MP |
370 | rdev->dma_mask = DMA_32BIT_MASK; |
371 | rdev->dev.dma_mask = &rdev->dma_mask; | |
372 | rdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | |
eb188d0e MP |
373 | |
374 | if ((rdev->pef & RIO_PEF_INB_DOORBELL) && | |
375 | (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) | |
376 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], | |
377 | 0, 0xffff); | |
378 | ||
379 | rio_add_device(rdev); | |
380 | ||
381 | out: | |
382 | return rdev; | |
383 | } | |
384 | ||
385 | /** | |
386 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
387 | * @port: Master port to send transaction | |
388 | * @destid: Associated destination ID for switch | |
389 | * @hopcount: Hopcount to reach switch | |
390 | * @sport: Switch port number | |
391 | * | |
392 | * Reads the port error status CSR for a particular switch port to | |
393 | * determine if the port has an active link. Returns | |
394 | * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is | |
395 | * inactive. | |
396 | */ | |
397 | static int | |
398 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
399 | { | |
400 | u32 result; | |
401 | u32 ext_ftr_ptr; | |
402 | ||
403 | int *entry = rio_sport_phys_table; | |
404 | ||
405 | do { | |
406 | if ((ext_ftr_ptr = | |
407 | rio_mport_get_feature(port, 0, destid, hopcount, *entry))) | |
408 | ||
409 | break; | |
410 | } while (*++entry >= 0); | |
411 | ||
412 | if (ext_ftr_ptr) | |
413 | rio_mport_read_config_32(port, destid, hopcount, | |
414 | ext_ftr_ptr + | |
415 | RIO_PORT_N_ERR_STS_CSR(sport), | |
416 | &result); | |
417 | ||
418 | return (result & PORT_N_ERR_STS_PORT_OK); | |
419 | } | |
420 | ||
421 | /** | |
422 | * rio_route_add_entry- Add a route entry to a switch routing table | |
423 | * @mport: Master port to send transaction | |
424 | * @rdev: Switch device | |
425 | * @table: Routing table ID | |
426 | * @route_destid: Destination ID to be routed | |
427 | * @route_port: Port number to be routed | |
428 | * | |
429 | * Calls the switch specific add_entry() method to add a route entry | |
430 | * on a switch. The route table can be specified using the @table | |
431 | * argument if a switch has per port routing tables or the normal | |
432 | * use is to specific all tables (or the global table) by passing | |
433 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
434 | * on failure. | |
435 | */ | |
436 | static int rio_route_add_entry(struct rio_mport *mport, struct rio_dev *rdev, | |
437 | u16 table, u16 route_destid, u8 route_port) | |
438 | { | |
439 | return rdev->rswitch->add_entry(mport, rdev->rswitch->destid, | |
440 | rdev->rswitch->hopcount, table, | |
441 | route_destid, route_port); | |
442 | } | |
443 | ||
444 | /** | |
445 | * rio_route_get_entry- Read a route entry in a switch routing table | |
446 | * @mport: Master port to send transaction | |
447 | * @rdev: Switch device | |
448 | * @table: Routing table ID | |
449 | * @route_destid: Destination ID to be routed | |
450 | * @route_port: Pointer to read port number into | |
451 | * | |
452 | * Calls the switch specific get_entry() method to read a route entry | |
453 | * in 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 | */ | |
459 | static int | |
460 | rio_route_get_entry(struct rio_mport *mport, struct rio_dev *rdev, u16 table, | |
461 | u16 route_destid, u8 * route_port) | |
462 | { | |
463 | return rdev->rswitch->get_entry(mport, rdev->rswitch->destid, | |
464 | rdev->rswitch->hopcount, table, | |
465 | route_destid, route_port); | |
466 | } | |
467 | ||
468 | /** | |
469 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
470 | * @port: Master port to send transaction | |
471 | * @hopcount: Number of hops to the device | |
472 | * | |
473 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
474 | * RIO device. Returns the value of the lock register. | |
475 | */ | |
476 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
477 | { | |
478 | u32 result; | |
479 | ||
480 | rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount, | |
481 | RIO_HOST_DID_LOCK_CSR, &result); | |
482 | ||
483 | return (u16) (result & 0xffff); | |
484 | } | |
485 | ||
486 | /** | |
487 | * rio_get_swpinfo_inport- Gets the ingress port number | |
488 | * @mport: Master port to send transaction | |
489 | * @destid: Destination ID associated with the switch | |
490 | * @hopcount: Number of hops to the device | |
491 | * | |
492 | * Returns port number being used to access the switch device. | |
493 | */ | |
494 | static u8 | |
495 | rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount) | |
496 | { | |
497 | u32 result; | |
498 | ||
499 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
500 | &result); | |
501 | ||
502 | return (u8) (result & 0xff); | |
503 | } | |
504 | ||
505 | /** | |
506 | * rio_get_swpinfo_tports- Gets total number of ports on the switch | |
507 | * @mport: Master port to send transaction | |
508 | * @destid: Destination ID associated with the switch | |
509 | * @hopcount: Number of hops to the device | |
510 | * | |
511 | * Returns total numbers of ports implemented by the switch device. | |
512 | */ | |
513 | static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid, | |
514 | u8 hopcount) | |
515 | { | |
516 | u32 result; | |
517 | ||
518 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
519 | &result); | |
520 | ||
521 | return RIO_GET_TOTAL_PORTS(result); | |
522 | } | |
523 | ||
524 | /** | |
525 | * rio_net_add_mport- Add a master port to a RIO network | |
526 | * @net: RIO network | |
527 | * @port: Master port to add | |
528 | * | |
529 | * Adds a master port to the network list of associated master | |
530 | * ports.. | |
531 | */ | |
532 | static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port) | |
533 | { | |
534 | spin_lock(&rio_global_list_lock); | |
535 | list_add_tail(&port->nnode, &net->mports); | |
536 | spin_unlock(&rio_global_list_lock); | |
537 | } | |
538 | ||
539 | /** | |
540 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
541 | * @net: RIO network being enumerated | |
542 | * @port: Master port to send transactions | |
543 | * @hopcount: Number of hops into the network | |
544 | * | |
545 | * Recursively enumerates a RIO network. Transactions are sent via the | |
546 | * master port passed in @port. | |
547 | */ | |
548 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, | |
549 | u8 hopcount) | |
550 | { | |
551 | int port_num; | |
552 | int num_ports; | |
553 | int cur_destid; | |
554 | struct rio_dev *rdev; | |
555 | u16 destid; | |
556 | int tmp; | |
557 | ||
558 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { | |
559 | pr_debug("RIO: PE already discovered by this host\n"); | |
560 | /* | |
561 | * Already discovered by this host. Add it as another | |
562 | * master port for the current network. | |
563 | */ | |
564 | rio_net_add_mport(net, port); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | /* Attempt to acquire device lock */ | |
569 | rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, | |
570 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); | |
571 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
572 | < port->host_deviceid) { | |
573 | /* Delay a bit */ | |
574 | mdelay(1); | |
575 | /* Attempt to acquire device lock again */ | |
576 | rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, | |
577 | RIO_HOST_DID_LOCK_CSR, | |
578 | port->host_deviceid); | |
579 | } | |
580 | ||
581 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
582 | pr_debug( | |
583 | "RIO: PE locked by a higher priority host...retreating\n"); | |
584 | return -1; | |
585 | } | |
586 | ||
587 | /* Setup new RIO device */ | |
588 | if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) { | |
589 | /* Add device to the global and bus/net specific list. */ | |
590 | list_add_tail(&rdev->net_list, &net->devices); | |
591 | } else | |
592 | return -1; | |
593 | ||
594 | if (rio_is_switch(rdev)) { | |
595 | next_switchid++; | |
596 | ||
597 | for (destid = 0; destid < next_destid; destid++) { | |
598 | rio_route_add_entry(port, rdev, RIO_GLOBAL_TABLE, | |
599 | destid, rio_get_swpinfo_inport(port, | |
600 | RIO_ANY_DESTID, | |
601 | hopcount)); | |
602 | rdev->rswitch->route_table[destid] = | |
603 | rio_get_swpinfo_inport(port, RIO_ANY_DESTID, | |
604 | hopcount); | |
605 | } | |
606 | ||
607 | num_ports = | |
608 | rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount); | |
609 | pr_debug( | |
610 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
611 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
612 | for (port_num = 0; port_num < num_ports; port_num++) { | |
613 | if (rio_get_swpinfo_inport | |
614 | (port, RIO_ANY_DESTID, hopcount) == port_num) | |
615 | continue; | |
616 | ||
617 | cur_destid = next_destid; | |
618 | ||
619 | if (rio_sport_is_active | |
620 | (port, RIO_ANY_DESTID, hopcount, port_num)) { | |
621 | pr_debug( | |
622 | "RIO: scanning device on port %d\n", | |
623 | port_num); | |
624 | rio_route_add_entry(port, rdev, | |
625 | RIO_GLOBAL_TABLE, | |
626 | RIO_ANY_DESTID, port_num); | |
627 | ||
628 | if (rio_enum_peer(net, port, hopcount + 1) < 0) | |
629 | return -1; | |
630 | ||
631 | /* Update routing tables */ | |
632 | if (next_destid > cur_destid) { | |
633 | for (destid = cur_destid; | |
634 | destid < next_destid; destid++) { | |
635 | rio_route_add_entry(port, rdev, | |
636 | RIO_GLOBAL_TABLE, | |
637 | destid, | |
638 | port_num); | |
639 | rdev->rswitch-> | |
640 | route_table[destid] = | |
641 | port_num; | |
642 | } | |
643 | rdev->rswitch->destid = cur_destid; | |
644 | } | |
645 | } | |
646 | } | |
647 | } else | |
648 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
649 | rio_name(rdev), rdev->vid, rdev->did); | |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | /** | |
655 | * rio_enum_complete- Tests if enumeration of a network is complete | |
656 | * @port: Master port to send transaction | |
657 | * | |
658 | * Tests the Component Tag CSR for presence of the magic enumeration | |
659 | * complete flag. Return %1 if enumeration is complete or %0 if | |
660 | * enumeration is incomplete. | |
661 | */ | |
662 | static int rio_enum_complete(struct rio_mport *port) | |
663 | { | |
664 | u32 tag_csr; | |
665 | int ret = 0; | |
666 | ||
667 | rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); | |
668 | ||
669 | if (tag_csr == RIO_ENUM_CMPL_MAGIC) | |
670 | ret = 1; | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
675 | /** | |
676 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
677 | * @net: RIO network being discovered | |
678 | * @port: Master port to send transactions | |
679 | * @destid: Current destination ID in network | |
680 | * @hopcount: Number of hops into the network | |
681 | * | |
682 | * Recursively discovers a RIO network. Transactions are sent via the | |
683 | * master port passed in @port. | |
684 | */ | |
685 | static int | |
686 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, | |
687 | u8 hopcount) | |
688 | { | |
689 | u8 port_num, route_port; | |
690 | int num_ports; | |
691 | struct rio_dev *rdev; | |
692 | u16 ndestid; | |
693 | ||
694 | /* Setup new RIO device */ | |
695 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
696 | /* Add device to the global and bus/net specific list. */ | |
697 | list_add_tail(&rdev->net_list, &net->devices); | |
698 | } else | |
699 | return -1; | |
700 | ||
701 | if (rio_is_switch(rdev)) { | |
702 | next_switchid++; | |
703 | ||
704 | /* Associated destid is how we accessed this switch */ | |
705 | rdev->rswitch->destid = destid; | |
706 | ||
707 | num_ports = rio_get_swpinfo_tports(port, destid, hopcount); | |
708 | pr_debug( | |
709 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
710 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
711 | for (port_num = 0; port_num < num_ports; port_num++) { | |
712 | if (rio_get_swpinfo_inport(port, destid, hopcount) == | |
713 | port_num) | |
714 | continue; | |
715 | ||
716 | if (rio_sport_is_active | |
717 | (port, destid, hopcount, port_num)) { | |
718 | pr_debug( | |
719 | "RIO: scanning device on port %d\n", | |
720 | port_num); | |
721 | for (ndestid = 0; ndestid < RIO_ANY_DESTID; | |
722 | ndestid++) { | |
723 | rio_route_get_entry(port, rdev, | |
724 | RIO_GLOBAL_TABLE, | |
725 | ndestid, | |
726 | &route_port); | |
727 | if (route_port == port_num) | |
728 | break; | |
729 | } | |
730 | ||
731 | if (rio_disc_peer | |
732 | (net, port, ndestid, hopcount + 1) < 0) | |
733 | return -1; | |
734 | } | |
735 | } | |
736 | } else | |
737 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
738 | rio_name(rdev), rdev->vid, rdev->did); | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | /** | |
744 | * rio_mport_is_active- Tests if master port link is active | |
745 | * @port: Master port to test | |
746 | * | |
747 | * Reads the port error status CSR for the master port to | |
748 | * determine if the port has an active link. Returns | |
749 | * %PORT_N_ERR_STS_PORT_OK if the master port is active | |
750 | * or %0 if it is inactive. | |
751 | */ | |
752 | static int rio_mport_is_active(struct rio_mport *port) | |
753 | { | |
754 | u32 result = 0; | |
755 | u32 ext_ftr_ptr; | |
756 | int *entry = rio_mport_phys_table; | |
757 | ||
758 | do { | |
759 | if ((ext_ftr_ptr = | |
760 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
761 | break; | |
762 | } while (*++entry >= 0); | |
763 | ||
764 | if (ext_ftr_ptr) | |
765 | rio_local_read_config_32(port, | |
766 | ext_ftr_ptr + | |
767 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
768 | &result); | |
769 | ||
770 | return (result & PORT_N_ERR_STS_PORT_OK); | |
771 | } | |
772 | ||
773 | /** | |
774 | * rio_alloc_net- Allocate and configure a new RIO network | |
775 | * @port: Master port associated with the RIO network | |
776 | * | |
777 | * Allocates a RIO network structure, initializes per-network | |
778 | * list heads, and adds the associated master port to the | |
779 | * network list of associated master ports. Returns a | |
780 | * RIO network pointer on success or %NULL on failure. | |
781 | */ | |
782 | static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) | |
783 | { | |
784 | struct rio_net *net; | |
785 | ||
786 | net = kmalloc(sizeof(struct rio_net), GFP_KERNEL); | |
787 | if (net) { | |
788 | memset(net, 0, sizeof(struct rio_net)); | |
789 | INIT_LIST_HEAD(&net->node); | |
790 | INIT_LIST_HEAD(&net->devices); | |
791 | INIT_LIST_HEAD(&net->mports); | |
792 | list_add_tail(&port->nnode, &net->mports); | |
793 | net->hport = port; | |
794 | net->id = next_net++; | |
795 | } | |
796 | return net; | |
797 | } | |
798 | ||
799 | /** | |
800 | * rio_enum_mport- Start enumeration through a master port | |
801 | * @mport: Master port to send transactions | |
802 | * | |
803 | * Starts the enumeration process. If somebody has enumerated our | |
804 | * master port device, then give up. If not and we have an active | |
805 | * link, then start recursive peer enumeration. Returns %0 if | |
806 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
807 | */ | |
808 | int rio_enum_mport(struct rio_mport *mport) | |
809 | { | |
810 | struct rio_net *net = NULL; | |
811 | int rc = 0; | |
812 | ||
813 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
814 | mport->name); | |
815 | /* If somebody else enumerated our master port device, bail. */ | |
816 | if (rio_enum_host(mport) < 0) { | |
817 | printk(KERN_INFO | |
818 | "RIO: master port %d device has been enumerated by a remote host\n", | |
819 | mport->id); | |
820 | rc = -EBUSY; | |
821 | goto out; | |
822 | } | |
823 | ||
824 | /* If master port has an active link, allocate net and enum peers */ | |
825 | if (rio_mport_is_active(mport)) { | |
826 | if (!(net = rio_alloc_net(mport))) { | |
827 | printk(KERN_ERR "RIO: failed to allocate new net\n"); | |
828 | rc = -ENOMEM; | |
829 | goto out; | |
830 | } | |
831 | if (rio_enum_peer(net, mport, 0) < 0) { | |
832 | /* A higher priority host won enumeration, bail. */ | |
833 | printk(KERN_INFO | |
834 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
835 | mport->id); | |
836 | rio_clear_locks(mport); | |
837 | rc = -EBUSY; | |
838 | goto out; | |
839 | } | |
840 | rio_clear_locks(mport); | |
841 | } else { | |
842 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
843 | mport->id); | |
844 | rc = -EINVAL; | |
845 | } | |
846 | ||
847 | out: | |
848 | return rc; | |
849 | } | |
850 | ||
851 | /** | |
852 | * rio_build_route_tables- Generate route tables from switch route entries | |
853 | * | |
854 | * For each switch device, generate a route table by copying existing | |
855 | * route entries from the switch. | |
856 | */ | |
857 | static void rio_build_route_tables(void) | |
858 | { | |
859 | struct rio_dev *rdev; | |
860 | int i; | |
861 | u8 sport; | |
862 | ||
863 | list_for_each_entry(rdev, &rio_devices, global_list) | |
864 | if (rio_is_switch(rdev)) | |
865 | for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) { | |
866 | if (rio_route_get_entry | |
867 | (rdev->net->hport, rdev, RIO_GLOBAL_TABLE, i, | |
868 | &sport) < 0) | |
869 | continue; | |
870 | rdev->rswitch->route_table[i] = sport; | |
871 | } | |
872 | } | |
873 | ||
874 | /** | |
875 | * rio_enum_timeout- Signal that enumeration timed out | |
876 | * @data: Address of timeout flag. | |
877 | * | |
878 | * When the enumeration complete timer expires, set a flag that | |
879 | * signals to the discovery process that enumeration did not | |
880 | * complete in a sane amount of time. | |
881 | */ | |
882 | static void rio_enum_timeout(unsigned long data) | |
883 | { | |
884 | /* Enumeration timed out, set flag */ | |
885 | *(int *)data = 1; | |
886 | } | |
887 | ||
888 | /** | |
889 | * rio_disc_mport- Start discovery through a master port | |
890 | * @mport: Master port to send transactions | |
891 | * | |
892 | * Starts the discovery process. If we have an active link, | |
893 | * then wait for the signal that enumeration is complete. | |
894 | * When enumeration completion is signaled, start recursive | |
895 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
896 | * on failure. | |
897 | */ | |
898 | int rio_disc_mport(struct rio_mport *mport) | |
899 | { | |
900 | struct rio_net *net = NULL; | |
901 | int enum_timeout_flag = 0; | |
902 | ||
903 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
904 | mport->name); | |
905 | ||
906 | /* If master port has an active link, allocate net and discover peers */ | |
907 | if (rio_mport_is_active(mport)) { | |
908 | if (!(net = rio_alloc_net(mport))) { | |
909 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
910 | goto bail; | |
911 | } | |
912 | ||
913 | pr_debug("RIO: wait for enumeration complete..."); | |
914 | ||
915 | rio_enum_timer.expires = | |
916 | jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; | |
917 | rio_enum_timer.data = (unsigned long)&enum_timeout_flag; | |
918 | add_timer(&rio_enum_timer); | |
919 | while (!rio_enum_complete(mport)) { | |
920 | mdelay(1); | |
921 | if (enum_timeout_flag) { | |
922 | del_timer_sync(&rio_enum_timer); | |
923 | goto timeout; | |
924 | } | |
925 | } | |
926 | del_timer_sync(&rio_enum_timer); | |
927 | ||
928 | pr_debug("done\n"); | |
929 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) { | |
930 | printk(KERN_INFO | |
931 | "RIO: master port %d device has failed discovery\n", | |
932 | mport->id); | |
933 | goto bail; | |
934 | } | |
935 | ||
936 | rio_build_route_tables(); | |
937 | } | |
938 | ||
939 | return 0; | |
940 | ||
941 | timeout: | |
942 | pr_debug("timeout\n"); | |
943 | bail: | |
944 | return -EBUSY; | |
945 | } |