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 | ||
eb188d0e MP |
13 | #include <linux/types.h> |
14 | #include <linux/kernel.h> | |
15 | ||
16 | #include <linux/delay.h> | |
fa78cc51 | 17 | #include <linux/dma-mapping.h> |
eb188d0e MP |
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> | |
de25968c TS |
26 | #include <linux/jiffies.h> |
27 | #include <linux/slab.h> | |
eb188d0e MP |
28 | |
29 | #include "rio.h" | |
30 | ||
31 | LIST_HEAD(rio_devices); | |
32 | static LIST_HEAD(rio_switches); | |
33 | ||
34 | #define RIO_ENUM_CMPL_MAGIC 0xdeadbeef | |
35 | ||
36 | static void rio_enum_timeout(unsigned long); | |
37 | ||
fa78cc51 MP |
38 | DEFINE_SPINLOCK(rio_global_list_lock); |
39 | ||
eb188d0e MP |
40 | static int next_destid = 0; |
41 | static int next_switchid = 0; | |
42 | static int next_net = 0; | |
43 | ||
44 | static struct timer_list rio_enum_timer = | |
45 | TIMER_INITIALIZER(rio_enum_timeout, 0, 0); | |
46 | ||
47 | static int rio_mport_phys_table[] = { | |
48 | RIO_EFB_PAR_EP_ID, | |
49 | RIO_EFB_PAR_EP_REC_ID, | |
50 | RIO_EFB_SER_EP_ID, | |
51 | RIO_EFB_SER_EP_REC_ID, | |
52 | -1, | |
53 | }; | |
54 | ||
55 | static int rio_sport_phys_table[] = { | |
56 | RIO_EFB_PAR_EP_FREE_ID, | |
57 | RIO_EFB_SER_EP_FREE_ID, | |
58 | -1, | |
59 | }; | |
60 | ||
eb188d0e MP |
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 | */ | |
fa78cc51 | 88 | static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) |
eb188d0e MP |
89 | { |
90 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
91 | RIO_SET_DID(did)); | |
92 | } | |
93 | ||
94 | /** | |
95 | * rio_local_set_device_id - Set the base/extended device id for a port | |
96 | * @port: RIO master port | |
97 | * @did: Device ID value to be written | |
98 | * | |
99 | * Writes the base/extended device id from a device. | |
100 | */ | |
101 | static void rio_local_set_device_id(struct rio_mport *port, u16 did) | |
102 | { | |
103 | rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(did)); | |
104 | } | |
105 | ||
106 | /** | |
107 | * rio_clear_locks- Release all host locks and signal enumeration complete | |
108 | * @port: Master port to issue transaction | |
109 | * | |
110 | * Marks the component tag CSR on each device with the enumeration | |
111 | * complete flag. When complete, it then release the host locks on | |
112 | * each device. Returns 0 on success or %-EINVAL on failure. | |
113 | */ | |
114 | static int rio_clear_locks(struct rio_mport *port) | |
115 | { | |
116 | struct rio_dev *rdev; | |
117 | u32 result; | |
118 | int ret = 0; | |
119 | ||
120 | /* Write component tag CSR magic complete value */ | |
121 | rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, | |
122 | RIO_ENUM_CMPL_MAGIC); | |
123 | list_for_each_entry(rdev, &rio_devices, global_list) | |
124 | rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, | |
125 | RIO_ENUM_CMPL_MAGIC); | |
126 | ||
127 | /* Release host device id locks */ | |
128 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
129 | port->host_deviceid); | |
130 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
131 | if ((result & 0xffff) != 0xffff) { | |
132 | printk(KERN_INFO | |
133 | "RIO: badness when releasing host lock on master port, result %8.8x\n", | |
134 | result); | |
135 | ret = -EINVAL; | |
136 | } | |
137 | list_for_each_entry(rdev, &rio_devices, global_list) { | |
138 | rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, | |
139 | port->host_deviceid); | |
140 | rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); | |
141 | if ((result & 0xffff) != 0xffff) { | |
142 | printk(KERN_INFO | |
143 | "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", | |
144 | rdev->vid, rdev->did); | |
145 | ret = -EINVAL; | |
146 | } | |
147 | } | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
152 | /** | |
153 | * rio_enum_host- Set host lock and initialize host destination ID | |
154 | * @port: Master port to issue transaction | |
155 | * | |
156 | * Sets the local host master port lock and destination ID register | |
157 | * with the host device ID value. The host device ID value is provided | |
158 | * by the platform. Returns %0 on success or %-1 on failure. | |
159 | */ | |
160 | static int rio_enum_host(struct rio_mport *port) | |
161 | { | |
162 | u32 result; | |
163 | ||
164 | /* Set master port host device id lock */ | |
165 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
166 | port->host_deviceid); | |
167 | ||
168 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
169 | if ((result & 0xffff) != port->host_deviceid) | |
170 | return -1; | |
171 | ||
172 | /* Set master port destid and init destid ctr */ | |
173 | rio_local_set_device_id(port, port->host_deviceid); | |
174 | ||
175 | if (next_destid == port->host_deviceid) | |
176 | next_destid++; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | /** | |
182 | * rio_device_has_destid- Test if a device contains a destination ID register | |
183 | * @port: Master port to issue transaction | |
184 | * @src_ops: RIO device source operations | |
185 | * @dst_ops: RIO device destination operations | |
186 | * | |
187 | * Checks the provided @src_ops and @dst_ops for the necessary transaction | |
188 | * capabilities that indicate whether or not a device will implement a | |
189 | * destination ID register. Returns 1 if true or 0 if false. | |
190 | */ | |
191 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
192 | int dst_ops) | |
193 | { | |
fa78cc51 MP |
194 | u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR; |
195 | ||
196 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
197 | } |
198 | ||
199 | /** | |
200 | * rio_release_dev- Frees a RIO device struct | |
201 | * @dev: LDM device associated with a RIO device struct | |
202 | * | |
203 | * Gets the RIO device struct associated a RIO device struct. | |
204 | * The RIO device struct is freed. | |
205 | */ | |
206 | static void rio_release_dev(struct device *dev) | |
207 | { | |
208 | struct rio_dev *rdev; | |
209 | ||
210 | rdev = to_rio_dev(dev); | |
211 | kfree(rdev); | |
212 | } | |
213 | ||
214 | /** | |
215 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
216 | * @rdev: RIO device | |
217 | * | |
218 | * Gets the RIO device Processing Element Features register | |
219 | * contents and tests for switch capabilities. Returns 1 if | |
220 | * the device is a switch or 0 if it is not a switch. | |
221 | * The RIO device struct is freed. | |
222 | */ | |
223 | static int rio_is_switch(struct rio_dev *rdev) | |
224 | { | |
225 | if (rdev->pef & RIO_PEF_SWITCH) | |
226 | return 1; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | /** | |
231 | * rio_route_set_ops- Sets routing operations for a particular vendor switch | |
232 | * @rdev: RIO device | |
233 | * | |
234 | * Searches the RIO route ops table for known switch types. If the vid | |
235 | * and did match a switch table entry, then set the add_entry() and | |
236 | * get_entry() ops to the table entry values. | |
237 | */ | |
238 | static void rio_route_set_ops(struct rio_dev *rdev) | |
239 | { | |
240 | struct rio_route_ops *cur = __start_rio_route_ops; | |
241 | struct rio_route_ops *end = __end_rio_route_ops; | |
242 | ||
243 | while (cur < end) { | |
244 | if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { | |
245 | pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev)); | |
246 | rdev->rswitch->add_entry = cur->add_hook; | |
247 | rdev->rswitch->get_entry = cur->get_hook; | |
248 | } | |
249 | cur++; | |
250 | } | |
251 | ||
252 | if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) | |
253 | printk(KERN_ERR "RIO: missing routing ops for %s\n", | |
254 | rio_name(rdev)); | |
255 | } | |
256 | ||
257 | /** | |
258 | * rio_add_device- Adds a RIO device to the device model | |
259 | * @rdev: RIO device | |
260 | * | |
261 | * Adds the RIO device to the global device list and adds the RIO | |
262 | * device to the RIO device list. Creates the generic sysfs nodes | |
263 | * for an RIO device. | |
264 | */ | |
265 | static void __devinit rio_add_device(struct rio_dev *rdev) | |
266 | { | |
267 | device_add(&rdev->dev); | |
268 | ||
269 | spin_lock(&rio_global_list_lock); | |
270 | list_add_tail(&rdev->global_list, &rio_devices); | |
271 | spin_unlock(&rio_global_list_lock); | |
272 | ||
273 | rio_create_sysfs_dev_files(rdev); | |
274 | } | |
275 | ||
276 | /** | |
277 | * rio_setup_device- Allocates and sets up a RIO device | |
278 | * @net: RIO network | |
279 | * @port: Master port to send transactions | |
280 | * @destid: Current destination ID | |
281 | * @hopcount: Current hopcount | |
282 | * @do_enum: Enumeration/Discovery mode flag | |
283 | * | |
284 | * Allocates a RIO device and configures fields based on configuration | |
285 | * space contents. If device has a destination ID register, a destination | |
286 | * ID is either assigned in enumeration mode or read from configuration | |
287 | * space in discovery mode. If the device has switch capabilities, then | |
288 | * a switch is allocated and configured appropriately. Returns a pointer | |
289 | * to a RIO device on success or NULL on failure. | |
290 | * | |
291 | */ | |
292 | static struct rio_dev *rio_setup_device(struct rio_net *net, | |
293 | struct rio_mport *port, u16 destid, | |
294 | u8 hopcount, int do_enum) | |
295 | { | |
296 | struct rio_dev *rdev; | |
297 | struct rio_switch *rswitch; | |
298 | int result, rdid; | |
299 | ||
dd00cc48 | 300 | rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL); |
eb188d0e MP |
301 | if (!rdev) |
302 | goto out; | |
303 | ||
eb188d0e MP |
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 | ||
c70555b0 AB |
328 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
329 | if (do_enum) { | |
330 | rio_set_device_id(port, destid, hopcount, next_destid); | |
331 | rdev->destid = next_destid++; | |
332 | if (next_destid == port->host_deviceid) | |
333 | next_destid++; | |
334 | } else | |
335 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
eb188d0e | 336 | } else |
c70555b0 AB |
337 | /* Switch device has an associated destID */ |
338 | rdev->destid = RIO_INVALID_DESTID; | |
eb188d0e MP |
339 | |
340 | /* If a PE has both switch and other functions, show it as a switch */ | |
341 | if (rio_is_switch(rdev)) { | |
342 | rio_mport_read_config_32(port, destid, hopcount, | |
343 | RIO_SWP_INFO_CAR, &rdev->swpinfo); | |
344 | rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL); | |
345 | if (!rswitch) { | |
346 | kfree(rdev); | |
347 | rdev = NULL; | |
348 | goto out; | |
349 | } | |
350 | rswitch->switchid = next_switchid; | |
351 | rswitch->hopcount = hopcount; | |
c70555b0 | 352 | rswitch->destid = destid; |
eb188d0e MP |
353 | /* Initialize switch route table */ |
354 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++) | |
355 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; | |
356 | rdev->rswitch = rswitch; | |
357 | sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id, | |
358 | rdev->rswitch->switchid); | |
359 | rio_route_set_ops(rdev); | |
360 | ||
361 | list_add_tail(&rswitch->node, &rio_switches); | |
362 | ||
363 | } else | |
364 | sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id, | |
365 | rdev->destid); | |
366 | ||
367 | rdev->dev.bus = &rio_bus_type; | |
368 | ||
369 | device_initialize(&rdev->dev); | |
370 | rdev->dev.release = rio_release_dev; | |
371 | rio_dev_get(rdev); | |
372 | ||
fa78cc51 MP |
373 | rdev->dma_mask = DMA_32BIT_MASK; |
374 | rdev->dev.dma_mask = &rdev->dma_mask; | |
375 | rdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | |
eb188d0e MP |
376 | |
377 | if ((rdev->pef & RIO_PEF_INB_DOORBELL) && | |
378 | (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) | |
379 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], | |
380 | 0, 0xffff); | |
381 | ||
382 | rio_add_device(rdev); | |
383 | ||
384 | out: | |
385 | return rdev; | |
386 | } | |
387 | ||
388 | /** | |
389 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
390 | * @port: Master port to send transaction | |
391 | * @destid: Associated destination ID for switch | |
392 | * @hopcount: Hopcount to reach switch | |
393 | * @sport: Switch port number | |
394 | * | |
395 | * Reads the port error status CSR for a particular switch port to | |
396 | * determine if the port has an active link. Returns | |
397 | * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is | |
398 | * inactive. | |
399 | */ | |
400 | static int | |
401 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
402 | { | |
403 | u32 result; | |
404 | u32 ext_ftr_ptr; | |
405 | ||
406 | int *entry = rio_sport_phys_table; | |
407 | ||
408 | do { | |
409 | if ((ext_ftr_ptr = | |
410 | rio_mport_get_feature(port, 0, destid, hopcount, *entry))) | |
411 | ||
412 | break; | |
413 | } while (*++entry >= 0); | |
414 | ||
415 | if (ext_ftr_ptr) | |
416 | rio_mport_read_config_32(port, destid, hopcount, | |
417 | ext_ftr_ptr + | |
418 | RIO_PORT_N_ERR_STS_CSR(sport), | |
419 | &result); | |
420 | ||
421 | return (result & PORT_N_ERR_STS_PORT_OK); | |
422 | } | |
423 | ||
424 | /** | |
425 | * rio_route_add_entry- Add a route entry to a switch routing table | |
426 | * @mport: Master port to send transaction | |
c70555b0 | 427 | * @rswitch: Switch device |
eb188d0e MP |
428 | * @table: Routing table ID |
429 | * @route_destid: Destination ID to be routed | |
430 | * @route_port: Port number to be routed | |
431 | * | |
432 | * Calls the switch specific add_entry() method to add a route entry | |
433 | * on a switch. The route table can be specified using the @table | |
434 | * argument if a switch has per port routing tables or the normal | |
435 | * use is to specific all tables (or the global table) by passing | |
436 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
437 | * on failure. | |
438 | */ | |
c70555b0 | 439 | static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch, |
eb188d0e MP |
440 | u16 table, u16 route_destid, u8 route_port) |
441 | { | |
c70555b0 AB |
442 | return rswitch->add_entry(mport, rswitch->destid, |
443 | rswitch->hopcount, table, | |
eb188d0e MP |
444 | route_destid, route_port); |
445 | } | |
446 | ||
447 | /** | |
448 | * rio_route_get_entry- Read a route entry in a switch routing table | |
449 | * @mport: Master port to send transaction | |
c70555b0 | 450 | * @rswitch: Switch device |
eb188d0e MP |
451 | * @table: Routing table ID |
452 | * @route_destid: Destination ID to be routed | |
453 | * @route_port: Pointer to read port number into | |
454 | * | |
455 | * Calls the switch specific get_entry() method to read a route entry | |
456 | * in a switch. The route table can be specified using the @table | |
457 | * argument if a switch has per port routing tables or the normal | |
458 | * use is to specific all tables (or the global table) by passing | |
459 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
460 | * on failure. | |
461 | */ | |
462 | static int | |
c70555b0 | 463 | rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table, |
eb188d0e MP |
464 | u16 route_destid, u8 * route_port) |
465 | { | |
c70555b0 AB |
466 | return rswitch->get_entry(mport, rswitch->destid, |
467 | rswitch->hopcount, table, | |
eb188d0e MP |
468 | route_destid, route_port); |
469 | } | |
470 | ||
471 | /** | |
472 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
473 | * @port: Master port to send transaction | |
474 | * @hopcount: Number of hops to the device | |
475 | * | |
476 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
477 | * RIO device. Returns the value of the lock register. | |
478 | */ | |
479 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
480 | { | |
481 | u32 result; | |
482 | ||
483 | rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount, | |
484 | RIO_HOST_DID_LOCK_CSR, &result); | |
485 | ||
486 | return (u16) (result & 0xffff); | |
487 | } | |
488 | ||
489 | /** | |
490 | * rio_get_swpinfo_inport- Gets the ingress port number | |
491 | * @mport: Master port to send transaction | |
492 | * @destid: Destination ID associated with the switch | |
493 | * @hopcount: Number of hops to the device | |
494 | * | |
495 | * Returns port number being used to access the switch device. | |
496 | */ | |
497 | static u8 | |
498 | rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount) | |
499 | { | |
500 | u32 result; | |
501 | ||
502 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
503 | &result); | |
504 | ||
505 | return (u8) (result & 0xff); | |
506 | } | |
507 | ||
508 | /** | |
509 | * rio_get_swpinfo_tports- Gets total number of ports on the switch | |
510 | * @mport: Master port to send transaction | |
511 | * @destid: Destination ID associated with the switch | |
512 | * @hopcount: Number of hops to the device | |
513 | * | |
514 | * Returns total numbers of ports implemented by the switch device. | |
515 | */ | |
516 | static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid, | |
517 | u8 hopcount) | |
518 | { | |
519 | u32 result; | |
520 | ||
521 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
522 | &result); | |
523 | ||
524 | return RIO_GET_TOTAL_PORTS(result); | |
525 | } | |
526 | ||
527 | /** | |
528 | * rio_net_add_mport- Add a master port to a RIO network | |
529 | * @net: RIO network | |
530 | * @port: Master port to add | |
531 | * | |
532 | * Adds a master port to the network list of associated master | |
533 | * ports.. | |
534 | */ | |
535 | static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port) | |
536 | { | |
537 | spin_lock(&rio_global_list_lock); | |
538 | list_add_tail(&port->nnode, &net->mports); | |
539 | spin_unlock(&rio_global_list_lock); | |
540 | } | |
541 | ||
542 | /** | |
543 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
544 | * @net: RIO network being enumerated | |
545 | * @port: Master port to send transactions | |
546 | * @hopcount: Number of hops into the network | |
547 | * | |
548 | * Recursively enumerates a RIO network. Transactions are sent via the | |
549 | * master port passed in @port. | |
550 | */ | |
551 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, | |
552 | u8 hopcount) | |
553 | { | |
554 | int port_num; | |
555 | int num_ports; | |
556 | int cur_destid; | |
c70555b0 AB |
557 | int sw_destid; |
558 | int sw_inport; | |
eb188d0e MP |
559 | struct rio_dev *rdev; |
560 | u16 destid; | |
561 | int tmp; | |
562 | ||
563 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { | |
564 | pr_debug("RIO: PE already discovered by this host\n"); | |
565 | /* | |
566 | * Already discovered by this host. Add it as another | |
567 | * master port for the current network. | |
568 | */ | |
569 | rio_net_add_mport(net, port); | |
570 | return 0; | |
571 | } | |
572 | ||
573 | /* Attempt to acquire device lock */ | |
574 | rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, | |
575 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); | |
576 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
577 | < port->host_deviceid) { | |
578 | /* Delay a bit */ | |
579 | mdelay(1); | |
580 | /* Attempt to acquire device lock again */ | |
581 | rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, | |
582 | RIO_HOST_DID_LOCK_CSR, | |
583 | port->host_deviceid); | |
584 | } | |
585 | ||
586 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
587 | pr_debug( | |
588 | "RIO: PE locked by a higher priority host...retreating\n"); | |
589 | return -1; | |
590 | } | |
591 | ||
592 | /* Setup new RIO device */ | |
593 | if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) { | |
594 | /* Add device to the global and bus/net specific list. */ | |
595 | list_add_tail(&rdev->net_list, &net->devices); | |
596 | } else | |
597 | return -1; | |
598 | ||
599 | if (rio_is_switch(rdev)) { | |
600 | next_switchid++; | |
c70555b0 AB |
601 | sw_inport = rio_get_swpinfo_inport(port, RIO_ANY_DESTID, hopcount); |
602 | rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, | |
603 | port->host_deviceid, sw_inport); | |
604 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; | |
eb188d0e MP |
605 | |
606 | for (destid = 0; destid < next_destid; destid++) { | |
c70555b0 AB |
607 | if (destid == port->host_deviceid) |
608 | continue; | |
609 | rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, | |
610 | destid, sw_inport); | |
611 | rdev->rswitch->route_table[destid] = sw_inport; | |
eb188d0e MP |
612 | } |
613 | ||
614 | num_ports = | |
615 | rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount); | |
616 | pr_debug( | |
617 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
618 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
c70555b0 | 619 | sw_destid = next_destid; |
eb188d0e | 620 | for (port_num = 0; port_num < num_ports; port_num++) { |
c70555b0 | 621 | if (sw_inport == port_num) |
eb188d0e MP |
622 | continue; |
623 | ||
624 | cur_destid = next_destid; | |
625 | ||
626 | if (rio_sport_is_active | |
627 | (port, RIO_ANY_DESTID, hopcount, port_num)) { | |
628 | pr_debug( | |
629 | "RIO: scanning device on port %d\n", | |
630 | port_num); | |
c70555b0 | 631 | rio_route_add_entry(port, rdev->rswitch, |
eb188d0e MP |
632 | RIO_GLOBAL_TABLE, |
633 | RIO_ANY_DESTID, port_num); | |
634 | ||
635 | if (rio_enum_peer(net, port, hopcount + 1) < 0) | |
636 | return -1; | |
637 | ||
638 | /* Update routing tables */ | |
639 | if (next_destid > cur_destid) { | |
640 | for (destid = cur_destid; | |
641 | destid < next_destid; destid++) { | |
c70555b0 AB |
642 | if (destid == port->host_deviceid) |
643 | continue; | |
644 | rio_route_add_entry(port, rdev->rswitch, | |
eb188d0e MP |
645 | RIO_GLOBAL_TABLE, |
646 | destid, | |
647 | port_num); | |
648 | rdev->rswitch-> | |
649 | route_table[destid] = | |
650 | port_num; | |
651 | } | |
eb188d0e MP |
652 | } |
653 | } | |
654 | } | |
c70555b0 AB |
655 | |
656 | /* Check for empty switch */ | |
657 | if (next_destid == sw_destid) { | |
658 | next_destid++; | |
659 | if (next_destid == port->host_deviceid) | |
660 | next_destid++; | |
661 | } | |
662 | ||
663 | rdev->rswitch->destid = sw_destid; | |
eb188d0e MP |
664 | } else |
665 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
666 | rio_name(rdev), rdev->vid, rdev->did); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | /** | |
672 | * rio_enum_complete- Tests if enumeration of a network is complete | |
673 | * @port: Master port to send transaction | |
674 | * | |
675 | * Tests the Component Tag CSR for presence of the magic enumeration | |
676 | * complete flag. Return %1 if enumeration is complete or %0 if | |
677 | * enumeration is incomplete. | |
678 | */ | |
679 | static int rio_enum_complete(struct rio_mport *port) | |
680 | { | |
681 | u32 tag_csr; | |
682 | int ret = 0; | |
683 | ||
684 | rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); | |
685 | ||
686 | if (tag_csr == RIO_ENUM_CMPL_MAGIC) | |
687 | ret = 1; | |
688 | ||
689 | return ret; | |
690 | } | |
691 | ||
692 | /** | |
693 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
694 | * @net: RIO network being discovered | |
695 | * @port: Master port to send transactions | |
696 | * @destid: Current destination ID in network | |
697 | * @hopcount: Number of hops into the network | |
698 | * | |
699 | * Recursively discovers a RIO network. Transactions are sent via the | |
700 | * master port passed in @port. | |
701 | */ | |
702 | static int | |
703 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, | |
704 | u8 hopcount) | |
705 | { | |
706 | u8 port_num, route_port; | |
707 | int num_ports; | |
708 | struct rio_dev *rdev; | |
709 | u16 ndestid; | |
710 | ||
711 | /* Setup new RIO device */ | |
712 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
713 | /* Add device to the global and bus/net specific list. */ | |
714 | list_add_tail(&rdev->net_list, &net->devices); | |
715 | } else | |
716 | return -1; | |
717 | ||
718 | if (rio_is_switch(rdev)) { | |
719 | next_switchid++; | |
720 | ||
721 | /* Associated destid is how we accessed this switch */ | |
722 | rdev->rswitch->destid = destid; | |
723 | ||
724 | num_ports = rio_get_swpinfo_tports(port, destid, hopcount); | |
725 | pr_debug( | |
726 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
727 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
728 | for (port_num = 0; port_num < num_ports; port_num++) { | |
729 | if (rio_get_swpinfo_inport(port, destid, hopcount) == | |
730 | port_num) | |
731 | continue; | |
732 | ||
733 | if (rio_sport_is_active | |
734 | (port, destid, hopcount, port_num)) { | |
735 | pr_debug( | |
736 | "RIO: scanning device on port %d\n", | |
737 | port_num); | |
738 | for (ndestid = 0; ndestid < RIO_ANY_DESTID; | |
739 | ndestid++) { | |
c70555b0 | 740 | rio_route_get_entry(port, rdev->rswitch, |
eb188d0e MP |
741 | RIO_GLOBAL_TABLE, |
742 | ndestid, | |
743 | &route_port); | |
744 | if (route_port == port_num) | |
745 | break; | |
746 | } | |
747 | ||
748 | if (rio_disc_peer | |
749 | (net, port, ndestid, hopcount + 1) < 0) | |
750 | return -1; | |
751 | } | |
752 | } | |
753 | } else | |
754 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
755 | rio_name(rdev), rdev->vid, rdev->did); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
760 | /** | |
761 | * rio_mport_is_active- Tests if master port link is active | |
762 | * @port: Master port to test | |
763 | * | |
764 | * Reads the port error status CSR for the master port to | |
765 | * determine if the port has an active link. Returns | |
766 | * %PORT_N_ERR_STS_PORT_OK if the master port is active | |
767 | * or %0 if it is inactive. | |
768 | */ | |
769 | static int rio_mport_is_active(struct rio_mport *port) | |
770 | { | |
771 | u32 result = 0; | |
772 | u32 ext_ftr_ptr; | |
773 | int *entry = rio_mport_phys_table; | |
774 | ||
775 | do { | |
776 | if ((ext_ftr_ptr = | |
777 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
778 | break; | |
779 | } while (*++entry >= 0); | |
780 | ||
781 | if (ext_ftr_ptr) | |
782 | rio_local_read_config_32(port, | |
783 | ext_ftr_ptr + | |
784 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
785 | &result); | |
786 | ||
787 | return (result & PORT_N_ERR_STS_PORT_OK); | |
788 | } | |
789 | ||
790 | /** | |
791 | * rio_alloc_net- Allocate and configure a new RIO network | |
792 | * @port: Master port associated with the RIO network | |
793 | * | |
794 | * Allocates a RIO network structure, initializes per-network | |
795 | * list heads, and adds the associated master port to the | |
796 | * network list of associated master ports. Returns a | |
797 | * RIO network pointer on success or %NULL on failure. | |
798 | */ | |
799 | static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) | |
800 | { | |
801 | struct rio_net *net; | |
802 | ||
dd00cc48 | 803 | net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); |
eb188d0e | 804 | if (net) { |
eb188d0e MP |
805 | INIT_LIST_HEAD(&net->node); |
806 | INIT_LIST_HEAD(&net->devices); | |
807 | INIT_LIST_HEAD(&net->mports); | |
808 | list_add_tail(&port->nnode, &net->mports); | |
809 | net->hport = port; | |
810 | net->id = next_net++; | |
811 | } | |
812 | return net; | |
813 | } | |
814 | ||
c70555b0 AB |
815 | /** |
816 | * rio_update_route_tables- Updates route tables in switches | |
817 | * @port: Master port associated with the RIO network | |
818 | * | |
819 | * For each enumerated device, ensure that each switch in a system | |
820 | * has correct routing entries. Add routes for devices that where | |
821 | * unknown dirung the first enumeration pass through the switch. | |
822 | */ | |
823 | static void rio_update_route_tables(struct rio_mport *port) | |
824 | { | |
825 | struct rio_dev *rdev; | |
826 | struct rio_switch *rswitch; | |
827 | u8 sport; | |
828 | u16 destid; | |
829 | ||
830 | list_for_each_entry(rdev, &rio_devices, global_list) { | |
831 | ||
832 | destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid; | |
833 | ||
834 | list_for_each_entry(rswitch, &rio_switches, node) { | |
835 | ||
836 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
837 | continue; | |
838 | ||
839 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
840 | ||
841 | sport = rio_get_swpinfo_inport(port, | |
842 | rswitch->destid, rswitch->hopcount); | |
843 | ||
844 | if (rswitch->add_entry) { | |
845 | rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport); | |
846 | rswitch->route_table[destid] = sport; | |
847 | } | |
848 | } | |
849 | } | |
850 | } | |
851 | } | |
852 | ||
eb188d0e MP |
853 | /** |
854 | * rio_enum_mport- Start enumeration through a master port | |
855 | * @mport: Master port to send transactions | |
856 | * | |
857 | * Starts the enumeration process. If somebody has enumerated our | |
858 | * master port device, then give up. If not and we have an active | |
859 | * link, then start recursive peer enumeration. Returns %0 if | |
860 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
861 | */ | |
862 | int rio_enum_mport(struct rio_mport *mport) | |
863 | { | |
864 | struct rio_net *net = NULL; | |
865 | int rc = 0; | |
866 | ||
867 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
868 | mport->name); | |
869 | /* If somebody else enumerated our master port device, bail. */ | |
870 | if (rio_enum_host(mport) < 0) { | |
871 | printk(KERN_INFO | |
872 | "RIO: master port %d device has been enumerated by a remote host\n", | |
873 | mport->id); | |
874 | rc = -EBUSY; | |
875 | goto out; | |
876 | } | |
877 | ||
878 | /* If master port has an active link, allocate net and enum peers */ | |
879 | if (rio_mport_is_active(mport)) { | |
880 | if (!(net = rio_alloc_net(mport))) { | |
881 | printk(KERN_ERR "RIO: failed to allocate new net\n"); | |
882 | rc = -ENOMEM; | |
883 | goto out; | |
884 | } | |
885 | if (rio_enum_peer(net, mport, 0) < 0) { | |
886 | /* A higher priority host won enumeration, bail. */ | |
887 | printk(KERN_INFO | |
888 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
889 | mport->id); | |
890 | rio_clear_locks(mport); | |
891 | rc = -EBUSY; | |
892 | goto out; | |
893 | } | |
c70555b0 | 894 | rio_update_route_tables(mport); |
eb188d0e MP |
895 | rio_clear_locks(mport); |
896 | } else { | |
897 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
898 | mport->id); | |
899 | rc = -EINVAL; | |
900 | } | |
901 | ||
902 | out: | |
903 | return rc; | |
904 | } | |
905 | ||
906 | /** | |
907 | * rio_build_route_tables- Generate route tables from switch route entries | |
908 | * | |
909 | * For each switch device, generate a route table by copying existing | |
910 | * route entries from the switch. | |
911 | */ | |
912 | static void rio_build_route_tables(void) | |
913 | { | |
914 | struct rio_dev *rdev; | |
915 | int i; | |
916 | u8 sport; | |
917 | ||
918 | list_for_each_entry(rdev, &rio_devices, global_list) | |
919 | if (rio_is_switch(rdev)) | |
920 | for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) { | |
921 | if (rio_route_get_entry | |
c70555b0 AB |
922 | (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE, |
923 | i, &sport) < 0) | |
eb188d0e MP |
924 | continue; |
925 | rdev->rswitch->route_table[i] = sport; | |
926 | } | |
927 | } | |
928 | ||
929 | /** | |
930 | * rio_enum_timeout- Signal that enumeration timed out | |
931 | * @data: Address of timeout flag. | |
932 | * | |
933 | * When the enumeration complete timer expires, set a flag that | |
934 | * signals to the discovery process that enumeration did not | |
935 | * complete in a sane amount of time. | |
936 | */ | |
937 | static void rio_enum_timeout(unsigned long data) | |
938 | { | |
939 | /* Enumeration timed out, set flag */ | |
940 | *(int *)data = 1; | |
941 | } | |
942 | ||
943 | /** | |
944 | * rio_disc_mport- Start discovery through a master port | |
945 | * @mport: Master port to send transactions | |
946 | * | |
947 | * Starts the discovery process. If we have an active link, | |
948 | * then wait for the signal that enumeration is complete. | |
949 | * When enumeration completion is signaled, start recursive | |
950 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
951 | * on failure. | |
952 | */ | |
953 | int rio_disc_mport(struct rio_mport *mport) | |
954 | { | |
955 | struct rio_net *net = NULL; | |
956 | int enum_timeout_flag = 0; | |
957 | ||
958 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
959 | mport->name); | |
960 | ||
961 | /* If master port has an active link, allocate net and discover peers */ | |
962 | if (rio_mport_is_active(mport)) { | |
963 | if (!(net = rio_alloc_net(mport))) { | |
964 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
965 | goto bail; | |
966 | } | |
967 | ||
968 | pr_debug("RIO: wait for enumeration complete..."); | |
969 | ||
970 | rio_enum_timer.expires = | |
971 | jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; | |
972 | rio_enum_timer.data = (unsigned long)&enum_timeout_flag; | |
973 | add_timer(&rio_enum_timer); | |
974 | while (!rio_enum_complete(mport)) { | |
975 | mdelay(1); | |
976 | if (enum_timeout_flag) { | |
977 | del_timer_sync(&rio_enum_timer); | |
978 | goto timeout; | |
979 | } | |
980 | } | |
981 | del_timer_sync(&rio_enum_timer); | |
982 | ||
983 | pr_debug("done\n"); | |
984 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) { | |
985 | printk(KERN_INFO | |
986 | "RIO: master port %d device has failed discovery\n", | |
987 | mport->id); | |
988 | goto bail; | |
989 | } | |
990 | ||
991 | rio_build_route_tables(); | |
992 | } | |
993 | ||
994 | return 0; | |
995 | ||
996 | timeout: | |
997 | pr_debug("timeout\n"); | |
998 | bail: | |
999 | return -EBUSY; | |
1000 | } |