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 | ||
e0423236 | 76 | return RIO_GET_DID(port->sys_size, result); |
eb188d0e MP |
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, | |
e0423236 | 91 | RIO_SET_DID(port->sys_size, did)); |
eb188d0e MP |
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 | { | |
e0423236 ZW |
103 | rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size, |
104 | did)); | |
eb188d0e MP |
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 | { | |
fa78cc51 MP |
195 | u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR; |
196 | ||
197 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
198 | } |
199 | ||
200 | /** | |
201 | * rio_release_dev- Frees a RIO device struct | |
202 | * @dev: LDM device associated with a RIO device struct | |
203 | * | |
204 | * Gets the RIO device struct associated a RIO device struct. | |
205 | * The RIO device struct is freed. | |
206 | */ | |
207 | static void rio_release_dev(struct device *dev) | |
208 | { | |
209 | struct rio_dev *rdev; | |
210 | ||
211 | rdev = to_rio_dev(dev); | |
212 | kfree(rdev); | |
213 | } | |
214 | ||
215 | /** | |
216 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
217 | * @rdev: RIO device | |
218 | * | |
219 | * Gets the RIO device Processing Element Features register | |
220 | * contents and tests for switch capabilities. Returns 1 if | |
221 | * the device is a switch or 0 if it is not a switch. | |
222 | * The RIO device struct is freed. | |
223 | */ | |
224 | static int rio_is_switch(struct rio_dev *rdev) | |
225 | { | |
226 | if (rdev->pef & RIO_PEF_SWITCH) | |
227 | return 1; | |
228 | return 0; | |
229 | } | |
230 | ||
231 | /** | |
232 | * rio_route_set_ops- Sets routing operations for a particular vendor switch | |
233 | * @rdev: RIO device | |
234 | * | |
235 | * Searches the RIO route ops table for known switch types. If the vid | |
236 | * and did match a switch table entry, then set the add_entry() and | |
237 | * get_entry() ops to the table entry values. | |
238 | */ | |
239 | static void rio_route_set_ops(struct rio_dev *rdev) | |
240 | { | |
241 | struct rio_route_ops *cur = __start_rio_route_ops; | |
242 | struct rio_route_ops *end = __end_rio_route_ops; | |
243 | ||
244 | while (cur < end) { | |
245 | if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { | |
246 | pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev)); | |
247 | rdev->rswitch->add_entry = cur->add_hook; | |
248 | rdev->rswitch->get_entry = cur->get_hook; | |
249 | } | |
250 | cur++; | |
251 | } | |
252 | ||
253 | if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) | |
254 | printk(KERN_ERR "RIO: missing routing ops for %s\n", | |
255 | rio_name(rdev)); | |
256 | } | |
257 | ||
258 | /** | |
259 | * rio_add_device- Adds a RIO device to the device model | |
260 | * @rdev: RIO device | |
261 | * | |
262 | * Adds the RIO device to the global device list and adds the RIO | |
263 | * device to the RIO device list. Creates the generic sysfs nodes | |
264 | * for an RIO device. | |
265 | */ | |
266 | static void __devinit rio_add_device(struct rio_dev *rdev) | |
267 | { | |
268 | device_add(&rdev->dev); | |
269 | ||
270 | spin_lock(&rio_global_list_lock); | |
271 | list_add_tail(&rdev->global_list, &rio_devices); | |
272 | spin_unlock(&rio_global_list_lock); | |
273 | ||
274 | rio_create_sysfs_dev_files(rdev); | |
275 | } | |
276 | ||
277 | /** | |
278 | * rio_setup_device- Allocates and sets up a RIO device | |
279 | * @net: RIO network | |
280 | * @port: Master port to send transactions | |
281 | * @destid: Current destination ID | |
282 | * @hopcount: Current hopcount | |
283 | * @do_enum: Enumeration/Discovery mode flag | |
284 | * | |
285 | * Allocates a RIO device and configures fields based on configuration | |
286 | * space contents. If device has a destination ID register, a destination | |
287 | * ID is either assigned in enumeration mode or read from configuration | |
288 | * space in discovery mode. If the device has switch capabilities, then | |
289 | * a switch is allocated and configured appropriately. Returns a pointer | |
290 | * to a RIO device on success or NULL on failure. | |
291 | * | |
292 | */ | |
293 | static struct rio_dev *rio_setup_device(struct rio_net *net, | |
294 | struct rio_mport *port, u16 destid, | |
295 | u8 hopcount, int do_enum) | |
296 | { | |
297 | struct rio_dev *rdev; | |
298 | struct rio_switch *rswitch; | |
299 | int result, rdid; | |
300 | ||
dd00cc48 | 301 | rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL); |
eb188d0e MP |
302 | if (!rdev) |
303 | goto out; | |
304 | ||
eb188d0e MP |
305 | rdev->net = net; |
306 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, | |
307 | &result); | |
308 | rdev->did = result >> 16; | |
309 | rdev->vid = result & 0xffff; | |
310 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, | |
311 | &rdev->device_rev); | |
312 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, | |
313 | &result); | |
314 | rdev->asm_did = result >> 16; | |
315 | rdev->asm_vid = result & 0xffff; | |
316 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, | |
317 | &result); | |
318 | rdev->asm_rev = result >> 16; | |
319 | rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR, | |
320 | &rdev->pef); | |
321 | if (rdev->pef & RIO_PEF_EXT_FEATURES) | |
322 | rdev->efptr = result & 0xffff; | |
323 | ||
324 | rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, | |
325 | &rdev->src_ops); | |
326 | rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, | |
327 | &rdev->dst_ops); | |
328 | ||
c70555b0 AB |
329 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
330 | if (do_enum) { | |
331 | rio_set_device_id(port, destid, hopcount, next_destid); | |
332 | rdev->destid = next_destid++; | |
333 | if (next_destid == port->host_deviceid) | |
334 | next_destid++; | |
335 | } else | |
336 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
eb188d0e | 337 | } else |
c70555b0 AB |
338 | /* Switch device has an associated destID */ |
339 | rdev->destid = RIO_INVALID_DESTID; | |
eb188d0e MP |
340 | |
341 | /* If a PE has both switch and other functions, show it as a switch */ | |
342 | if (rio_is_switch(rdev)) { | |
343 | rio_mport_read_config_32(port, destid, hopcount, | |
344 | RIO_SWP_INFO_CAR, &rdev->swpinfo); | |
345 | rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL); | |
346 | if (!rswitch) { | |
347 | kfree(rdev); | |
348 | rdev = NULL; | |
349 | goto out; | |
350 | } | |
351 | rswitch->switchid = next_switchid; | |
352 | rswitch->hopcount = hopcount; | |
c70555b0 | 353 | rswitch->destid = destid; |
e0423236 ZW |
354 | rswitch->route_table = kzalloc(sizeof(u8)* |
355 | RIO_MAX_ROUTE_ENTRIES(port->sys_size), | |
356 | GFP_KERNEL); | |
357 | if (!rswitch->route_table) { | |
358 | kfree(rdev); | |
359 | rdev = NULL; | |
360 | kfree(rswitch); | |
361 | goto out; | |
362 | } | |
eb188d0e | 363 | /* Initialize switch route table */ |
e0423236 ZW |
364 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); |
365 | rdid++) | |
eb188d0e MP |
366 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; |
367 | rdev->rswitch = rswitch; | |
368 | sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id, | |
369 | rdev->rswitch->switchid); | |
370 | rio_route_set_ops(rdev); | |
371 | ||
372 | list_add_tail(&rswitch->node, &rio_switches); | |
373 | ||
374 | } else | |
375 | sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id, | |
376 | rdev->destid); | |
377 | ||
378 | rdev->dev.bus = &rio_bus_type; | |
379 | ||
380 | device_initialize(&rdev->dev); | |
381 | rdev->dev.release = rio_release_dev; | |
382 | rio_dev_get(rdev); | |
383 | ||
fa78cc51 MP |
384 | rdev->dma_mask = DMA_32BIT_MASK; |
385 | rdev->dev.dma_mask = &rdev->dma_mask; | |
386 | rdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | |
eb188d0e MP |
387 | |
388 | if ((rdev->pef & RIO_PEF_INB_DOORBELL) && | |
389 | (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) | |
390 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], | |
391 | 0, 0xffff); | |
392 | ||
393 | rio_add_device(rdev); | |
394 | ||
395 | out: | |
396 | return rdev; | |
397 | } | |
398 | ||
399 | /** | |
400 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
401 | * @port: Master port to send transaction | |
402 | * @destid: Associated destination ID for switch | |
403 | * @hopcount: Hopcount to reach switch | |
404 | * @sport: Switch port number | |
405 | * | |
406 | * Reads the port error status CSR for a particular switch port to | |
407 | * determine if the port has an active link. Returns | |
408 | * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is | |
409 | * inactive. | |
410 | */ | |
411 | static int | |
412 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
413 | { | |
414 | u32 result; | |
415 | u32 ext_ftr_ptr; | |
416 | ||
417 | int *entry = rio_sport_phys_table; | |
418 | ||
419 | do { | |
420 | if ((ext_ftr_ptr = | |
421 | rio_mport_get_feature(port, 0, destid, hopcount, *entry))) | |
422 | ||
423 | break; | |
424 | } while (*++entry >= 0); | |
425 | ||
426 | if (ext_ftr_ptr) | |
427 | rio_mport_read_config_32(port, destid, hopcount, | |
428 | ext_ftr_ptr + | |
429 | RIO_PORT_N_ERR_STS_CSR(sport), | |
430 | &result); | |
431 | ||
432 | return (result & PORT_N_ERR_STS_PORT_OK); | |
433 | } | |
434 | ||
435 | /** | |
436 | * rio_route_add_entry- Add a route entry to a switch routing table | |
437 | * @mport: Master port to send transaction | |
c70555b0 | 438 | * @rswitch: Switch device |
eb188d0e MP |
439 | * @table: Routing table ID |
440 | * @route_destid: Destination ID to be routed | |
441 | * @route_port: Port number to be routed | |
442 | * | |
443 | * Calls the switch specific add_entry() method to add a route entry | |
444 | * on a switch. The route table can be specified using the @table | |
445 | * argument if a switch has per port routing tables or the normal | |
446 | * use is to specific all tables (or the global table) by passing | |
447 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
448 | * on failure. | |
449 | */ | |
c70555b0 | 450 | static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch, |
eb188d0e MP |
451 | u16 table, u16 route_destid, u8 route_port) |
452 | { | |
c70555b0 AB |
453 | return rswitch->add_entry(mport, rswitch->destid, |
454 | rswitch->hopcount, table, | |
eb188d0e MP |
455 | route_destid, route_port); |
456 | } | |
457 | ||
458 | /** | |
459 | * rio_route_get_entry- Read a route entry in a switch routing table | |
460 | * @mport: Master port to send transaction | |
c70555b0 | 461 | * @rswitch: Switch device |
eb188d0e MP |
462 | * @table: Routing table ID |
463 | * @route_destid: Destination ID to be routed | |
464 | * @route_port: Pointer to read port number into | |
465 | * | |
466 | * Calls the switch specific get_entry() method to read a route entry | |
467 | * in a switch. The route table can be specified using the @table | |
468 | * argument if a switch has per port routing tables or the normal | |
469 | * use is to specific all tables (or the global table) by passing | |
470 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
471 | * on failure. | |
472 | */ | |
473 | static int | |
c70555b0 | 474 | rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table, |
eb188d0e MP |
475 | u16 route_destid, u8 * route_port) |
476 | { | |
c70555b0 AB |
477 | return rswitch->get_entry(mport, rswitch->destid, |
478 | rswitch->hopcount, table, | |
eb188d0e MP |
479 | route_destid, route_port); |
480 | } | |
481 | ||
482 | /** | |
483 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
484 | * @port: Master port to send transaction | |
485 | * @hopcount: Number of hops to the device | |
486 | * | |
487 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
488 | * RIO device. Returns the value of the lock register. | |
489 | */ | |
490 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
491 | { | |
492 | u32 result; | |
493 | ||
e0423236 | 494 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, |
eb188d0e MP |
495 | RIO_HOST_DID_LOCK_CSR, &result); |
496 | ||
497 | return (u16) (result & 0xffff); | |
498 | } | |
499 | ||
500 | /** | |
501 | * rio_get_swpinfo_inport- Gets the ingress port number | |
502 | * @mport: Master port to send transaction | |
503 | * @destid: Destination ID associated with the switch | |
504 | * @hopcount: Number of hops to the device | |
505 | * | |
506 | * Returns port number being used to access the switch device. | |
507 | */ | |
508 | static u8 | |
509 | rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount) | |
510 | { | |
511 | u32 result; | |
512 | ||
513 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
514 | &result); | |
515 | ||
516 | return (u8) (result & 0xff); | |
517 | } | |
518 | ||
519 | /** | |
520 | * rio_get_swpinfo_tports- Gets total number of ports on the switch | |
521 | * @mport: Master port to send transaction | |
522 | * @destid: Destination ID associated with the switch | |
523 | * @hopcount: Number of hops to the device | |
524 | * | |
525 | * Returns total numbers of ports implemented by the switch device. | |
526 | */ | |
527 | static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid, | |
528 | u8 hopcount) | |
529 | { | |
530 | u32 result; | |
531 | ||
532 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, | |
533 | &result); | |
534 | ||
535 | return RIO_GET_TOTAL_PORTS(result); | |
536 | } | |
537 | ||
538 | /** | |
539 | * rio_net_add_mport- Add a master port to a RIO network | |
540 | * @net: RIO network | |
541 | * @port: Master port to add | |
542 | * | |
543 | * Adds a master port to the network list of associated master | |
544 | * ports.. | |
545 | */ | |
546 | static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port) | |
547 | { | |
548 | spin_lock(&rio_global_list_lock); | |
549 | list_add_tail(&port->nnode, &net->mports); | |
550 | spin_unlock(&rio_global_list_lock); | |
551 | } | |
552 | ||
553 | /** | |
554 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
555 | * @net: RIO network being enumerated | |
556 | * @port: Master port to send transactions | |
557 | * @hopcount: Number of hops into the network | |
558 | * | |
559 | * Recursively enumerates a RIO network. Transactions are sent via the | |
560 | * master port passed in @port. | |
561 | */ | |
562 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, | |
563 | u8 hopcount) | |
564 | { | |
565 | int port_num; | |
566 | int num_ports; | |
567 | int cur_destid; | |
c70555b0 AB |
568 | int sw_destid; |
569 | int sw_inport; | |
eb188d0e MP |
570 | struct rio_dev *rdev; |
571 | u16 destid; | |
572 | int tmp; | |
573 | ||
574 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { | |
575 | pr_debug("RIO: PE already discovered by this host\n"); | |
576 | /* | |
577 | * Already discovered by this host. Add it as another | |
578 | * master port for the current network. | |
579 | */ | |
580 | rio_net_add_mport(net, port); | |
581 | return 0; | |
582 | } | |
583 | ||
584 | /* Attempt to acquire device lock */ | |
e0423236 ZW |
585 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
586 | hopcount, | |
eb188d0e MP |
587 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); |
588 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
589 | < port->host_deviceid) { | |
590 | /* Delay a bit */ | |
591 | mdelay(1); | |
592 | /* Attempt to acquire device lock again */ | |
e0423236 ZW |
593 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
594 | hopcount, | |
eb188d0e MP |
595 | RIO_HOST_DID_LOCK_CSR, |
596 | port->host_deviceid); | |
597 | } | |
598 | ||
599 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
600 | pr_debug( | |
601 | "RIO: PE locked by a higher priority host...retreating\n"); | |
602 | return -1; | |
603 | } | |
604 | ||
605 | /* Setup new RIO device */ | |
e0423236 ZW |
606 | rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), |
607 | hopcount, 1); | |
608 | if (rdev) { | |
eb188d0e MP |
609 | /* Add device to the global and bus/net specific list. */ |
610 | list_add_tail(&rdev->net_list, &net->devices); | |
611 | } else | |
612 | return -1; | |
613 | ||
614 | if (rio_is_switch(rdev)) { | |
615 | next_switchid++; | |
e0423236 ZW |
616 | sw_inport = rio_get_swpinfo_inport(port, |
617 | RIO_ANY_DESTID(port->sys_size), hopcount); | |
c70555b0 AB |
618 | rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, |
619 | port->host_deviceid, sw_inport); | |
620 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; | |
eb188d0e MP |
621 | |
622 | for (destid = 0; destid < next_destid; destid++) { | |
c70555b0 AB |
623 | if (destid == port->host_deviceid) |
624 | continue; | |
625 | rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, | |
626 | destid, sw_inport); | |
627 | rdev->rswitch->route_table[destid] = sw_inport; | |
eb188d0e MP |
628 | } |
629 | ||
630 | num_ports = | |
e0423236 ZW |
631 | rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size), |
632 | hopcount); | |
eb188d0e MP |
633 | pr_debug( |
634 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
635 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
c70555b0 | 636 | sw_destid = next_destid; |
eb188d0e | 637 | for (port_num = 0; port_num < num_ports; port_num++) { |
c70555b0 | 638 | if (sw_inport == port_num) |
eb188d0e MP |
639 | continue; |
640 | ||
641 | cur_destid = next_destid; | |
642 | ||
643 | if (rio_sport_is_active | |
e0423236 ZW |
644 | (port, RIO_ANY_DESTID(port->sys_size), hopcount, |
645 | port_num)) { | |
eb188d0e MP |
646 | pr_debug( |
647 | "RIO: scanning device on port %d\n", | |
648 | port_num); | |
c70555b0 | 649 | rio_route_add_entry(port, rdev->rswitch, |
e0423236 ZW |
650 | RIO_GLOBAL_TABLE, |
651 | RIO_ANY_DESTID(port->sys_size), | |
652 | port_num); | |
eb188d0e MP |
653 | |
654 | if (rio_enum_peer(net, port, hopcount + 1) < 0) | |
655 | return -1; | |
656 | ||
657 | /* Update routing tables */ | |
658 | if (next_destid > cur_destid) { | |
659 | for (destid = cur_destid; | |
660 | destid < next_destid; destid++) { | |
c70555b0 AB |
661 | if (destid == port->host_deviceid) |
662 | continue; | |
663 | rio_route_add_entry(port, rdev->rswitch, | |
eb188d0e MP |
664 | RIO_GLOBAL_TABLE, |
665 | destid, | |
666 | port_num); | |
667 | rdev->rswitch-> | |
668 | route_table[destid] = | |
669 | port_num; | |
670 | } | |
eb188d0e MP |
671 | } |
672 | } | |
673 | } | |
c70555b0 AB |
674 | |
675 | /* Check for empty switch */ | |
676 | if (next_destid == sw_destid) { | |
677 | next_destid++; | |
678 | if (next_destid == port->host_deviceid) | |
679 | next_destid++; | |
680 | } | |
681 | ||
682 | rdev->rswitch->destid = sw_destid; | |
eb188d0e MP |
683 | } else |
684 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
685 | rio_name(rdev), rdev->vid, rdev->did); | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | /** | |
691 | * rio_enum_complete- Tests if enumeration of a network is complete | |
692 | * @port: Master port to send transaction | |
693 | * | |
694 | * Tests the Component Tag CSR for presence of the magic enumeration | |
695 | * complete flag. Return %1 if enumeration is complete or %0 if | |
696 | * enumeration is incomplete. | |
697 | */ | |
698 | static int rio_enum_complete(struct rio_mport *port) | |
699 | { | |
700 | u32 tag_csr; | |
701 | int ret = 0; | |
702 | ||
703 | rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); | |
704 | ||
705 | if (tag_csr == RIO_ENUM_CMPL_MAGIC) | |
706 | ret = 1; | |
707 | ||
708 | return ret; | |
709 | } | |
710 | ||
711 | /** | |
712 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
713 | * @net: RIO network being discovered | |
714 | * @port: Master port to send transactions | |
715 | * @destid: Current destination ID in network | |
716 | * @hopcount: Number of hops into the network | |
717 | * | |
718 | * Recursively discovers a RIO network. Transactions are sent via the | |
719 | * master port passed in @port. | |
720 | */ | |
721 | static int | |
722 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, | |
723 | u8 hopcount) | |
724 | { | |
725 | u8 port_num, route_port; | |
726 | int num_ports; | |
727 | struct rio_dev *rdev; | |
728 | u16 ndestid; | |
729 | ||
730 | /* Setup new RIO device */ | |
731 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
732 | /* Add device to the global and bus/net specific list. */ | |
733 | list_add_tail(&rdev->net_list, &net->devices); | |
734 | } else | |
735 | return -1; | |
736 | ||
737 | if (rio_is_switch(rdev)) { | |
738 | next_switchid++; | |
739 | ||
740 | /* Associated destid is how we accessed this switch */ | |
741 | rdev->rswitch->destid = destid; | |
742 | ||
743 | num_ports = rio_get_swpinfo_tports(port, destid, hopcount); | |
744 | pr_debug( | |
745 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
746 | rio_name(rdev), rdev->vid, rdev->did, num_ports); | |
747 | for (port_num = 0; port_num < num_ports; port_num++) { | |
748 | if (rio_get_swpinfo_inport(port, destid, hopcount) == | |
749 | port_num) | |
750 | continue; | |
751 | ||
752 | if (rio_sport_is_active | |
753 | (port, destid, hopcount, port_num)) { | |
754 | pr_debug( | |
755 | "RIO: scanning device on port %d\n", | |
756 | port_num); | |
e0423236 ZW |
757 | for (ndestid = 0; |
758 | ndestid < RIO_ANY_DESTID(port->sys_size); | |
eb188d0e | 759 | ndestid++) { |
c70555b0 | 760 | rio_route_get_entry(port, rdev->rswitch, |
eb188d0e MP |
761 | RIO_GLOBAL_TABLE, |
762 | ndestid, | |
763 | &route_port); | |
764 | if (route_port == port_num) | |
765 | break; | |
766 | } | |
767 | ||
768 | if (rio_disc_peer | |
769 | (net, port, ndestid, hopcount + 1) < 0) | |
770 | return -1; | |
771 | } | |
772 | } | |
773 | } else | |
774 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
775 | rio_name(rdev), rdev->vid, rdev->did); | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | /** | |
781 | * rio_mport_is_active- Tests if master port link is active | |
782 | * @port: Master port to test | |
783 | * | |
784 | * Reads the port error status CSR for the master port to | |
785 | * determine if the port has an active link. Returns | |
786 | * %PORT_N_ERR_STS_PORT_OK if the master port is active | |
787 | * or %0 if it is inactive. | |
788 | */ | |
789 | static int rio_mport_is_active(struct rio_mport *port) | |
790 | { | |
791 | u32 result = 0; | |
792 | u32 ext_ftr_ptr; | |
793 | int *entry = rio_mport_phys_table; | |
794 | ||
795 | do { | |
796 | if ((ext_ftr_ptr = | |
797 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
798 | break; | |
799 | } while (*++entry >= 0); | |
800 | ||
801 | if (ext_ftr_ptr) | |
802 | rio_local_read_config_32(port, | |
803 | ext_ftr_ptr + | |
804 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
805 | &result); | |
806 | ||
807 | return (result & PORT_N_ERR_STS_PORT_OK); | |
808 | } | |
809 | ||
810 | /** | |
811 | * rio_alloc_net- Allocate and configure a new RIO network | |
812 | * @port: Master port associated with the RIO network | |
813 | * | |
814 | * Allocates a RIO network structure, initializes per-network | |
815 | * list heads, and adds the associated master port to the | |
816 | * network list of associated master ports. Returns a | |
817 | * RIO network pointer on success or %NULL on failure. | |
818 | */ | |
819 | static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) | |
820 | { | |
821 | struct rio_net *net; | |
822 | ||
dd00cc48 | 823 | net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); |
eb188d0e | 824 | if (net) { |
eb188d0e MP |
825 | INIT_LIST_HEAD(&net->node); |
826 | INIT_LIST_HEAD(&net->devices); | |
827 | INIT_LIST_HEAD(&net->mports); | |
828 | list_add_tail(&port->nnode, &net->mports); | |
829 | net->hport = port; | |
830 | net->id = next_net++; | |
831 | } | |
832 | return net; | |
833 | } | |
834 | ||
c70555b0 AB |
835 | /** |
836 | * rio_update_route_tables- Updates route tables in switches | |
837 | * @port: Master port associated with the RIO network | |
838 | * | |
839 | * For each enumerated device, ensure that each switch in a system | |
840 | * has correct routing entries. Add routes for devices that where | |
841 | * unknown dirung the first enumeration pass through the switch. | |
842 | */ | |
843 | static void rio_update_route_tables(struct rio_mport *port) | |
844 | { | |
845 | struct rio_dev *rdev; | |
846 | struct rio_switch *rswitch; | |
847 | u8 sport; | |
848 | u16 destid; | |
849 | ||
850 | list_for_each_entry(rdev, &rio_devices, global_list) { | |
851 | ||
852 | destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid; | |
853 | ||
854 | list_for_each_entry(rswitch, &rio_switches, node) { | |
855 | ||
856 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
857 | continue; | |
858 | ||
859 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
860 | ||
861 | sport = rio_get_swpinfo_inport(port, | |
862 | rswitch->destid, rswitch->hopcount); | |
863 | ||
864 | if (rswitch->add_entry) { | |
865 | rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport); | |
866 | rswitch->route_table[destid] = sport; | |
867 | } | |
868 | } | |
869 | } | |
870 | } | |
871 | } | |
872 | ||
eb188d0e MP |
873 | /** |
874 | * rio_enum_mport- Start enumeration through a master port | |
875 | * @mport: Master port to send transactions | |
876 | * | |
877 | * Starts the enumeration process. If somebody has enumerated our | |
878 | * master port device, then give up. If not and we have an active | |
879 | * link, then start recursive peer enumeration. Returns %0 if | |
880 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
881 | */ | |
882 | int rio_enum_mport(struct rio_mport *mport) | |
883 | { | |
884 | struct rio_net *net = NULL; | |
885 | int rc = 0; | |
886 | ||
887 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
888 | mport->name); | |
889 | /* If somebody else enumerated our master port device, bail. */ | |
890 | if (rio_enum_host(mport) < 0) { | |
891 | printk(KERN_INFO | |
892 | "RIO: master port %d device has been enumerated by a remote host\n", | |
893 | mport->id); | |
894 | rc = -EBUSY; | |
895 | goto out; | |
896 | } | |
897 | ||
898 | /* If master port has an active link, allocate net and enum peers */ | |
899 | if (rio_mport_is_active(mport)) { | |
900 | if (!(net = rio_alloc_net(mport))) { | |
901 | printk(KERN_ERR "RIO: failed to allocate new net\n"); | |
902 | rc = -ENOMEM; | |
903 | goto out; | |
904 | } | |
905 | if (rio_enum_peer(net, mport, 0) < 0) { | |
906 | /* A higher priority host won enumeration, bail. */ | |
907 | printk(KERN_INFO | |
908 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
909 | mport->id); | |
910 | rio_clear_locks(mport); | |
911 | rc = -EBUSY; | |
912 | goto out; | |
913 | } | |
c70555b0 | 914 | rio_update_route_tables(mport); |
eb188d0e MP |
915 | rio_clear_locks(mport); |
916 | } else { | |
917 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
918 | mport->id); | |
919 | rc = -EINVAL; | |
920 | } | |
921 | ||
922 | out: | |
923 | return rc; | |
924 | } | |
925 | ||
926 | /** | |
927 | * rio_build_route_tables- Generate route tables from switch route entries | |
928 | * | |
929 | * For each switch device, generate a route table by copying existing | |
930 | * route entries from the switch. | |
931 | */ | |
932 | static void rio_build_route_tables(void) | |
933 | { | |
934 | struct rio_dev *rdev; | |
935 | int i; | |
936 | u8 sport; | |
937 | ||
938 | list_for_each_entry(rdev, &rio_devices, global_list) | |
939 | if (rio_is_switch(rdev)) | |
e0423236 ZW |
940 | for (i = 0; |
941 | i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size); | |
942 | i++) { | |
eb188d0e | 943 | if (rio_route_get_entry |
c70555b0 AB |
944 | (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE, |
945 | i, &sport) < 0) | |
eb188d0e MP |
946 | continue; |
947 | rdev->rswitch->route_table[i] = sport; | |
948 | } | |
949 | } | |
950 | ||
951 | /** | |
952 | * rio_enum_timeout- Signal that enumeration timed out | |
953 | * @data: Address of timeout flag. | |
954 | * | |
955 | * When the enumeration complete timer expires, set a flag that | |
956 | * signals to the discovery process that enumeration did not | |
957 | * complete in a sane amount of time. | |
958 | */ | |
959 | static void rio_enum_timeout(unsigned long data) | |
960 | { | |
961 | /* Enumeration timed out, set flag */ | |
962 | *(int *)data = 1; | |
963 | } | |
964 | ||
965 | /** | |
966 | * rio_disc_mport- Start discovery through a master port | |
967 | * @mport: Master port to send transactions | |
968 | * | |
969 | * Starts the discovery process. If we have an active link, | |
970 | * then wait for the signal that enumeration is complete. | |
971 | * When enumeration completion is signaled, start recursive | |
972 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
973 | * on failure. | |
974 | */ | |
975 | int rio_disc_mport(struct rio_mport *mport) | |
976 | { | |
977 | struct rio_net *net = NULL; | |
978 | int enum_timeout_flag = 0; | |
979 | ||
980 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
981 | mport->name); | |
982 | ||
983 | /* If master port has an active link, allocate net and discover peers */ | |
984 | if (rio_mport_is_active(mport)) { | |
985 | if (!(net = rio_alloc_net(mport))) { | |
986 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
987 | goto bail; | |
988 | } | |
989 | ||
990 | pr_debug("RIO: wait for enumeration complete..."); | |
991 | ||
992 | rio_enum_timer.expires = | |
993 | jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; | |
994 | rio_enum_timer.data = (unsigned long)&enum_timeout_flag; | |
995 | add_timer(&rio_enum_timer); | |
996 | while (!rio_enum_complete(mport)) { | |
997 | mdelay(1); | |
998 | if (enum_timeout_flag) { | |
999 | del_timer_sync(&rio_enum_timer); | |
1000 | goto timeout; | |
1001 | } | |
1002 | } | |
1003 | del_timer_sync(&rio_enum_timer); | |
1004 | ||
1005 | pr_debug("done\n"); | |
e0423236 ZW |
1006 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), |
1007 | 0) < 0) { | |
eb188d0e MP |
1008 | printk(KERN_INFO |
1009 | "RIO: master port %d device has failed discovery\n", | |
1010 | mport->id); | |
1011 | goto bail; | |
1012 | } | |
1013 | ||
1014 | rio_build_route_tables(); | |
1015 | } | |
1016 | ||
1017 | return 0; | |
1018 | ||
1019 | timeout: | |
1020 | pr_debug("timeout\n"); | |
1021 | bail: | |
1022 | return -EBUSY; | |
1023 | } |