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 | * | |
e5cabeb3 AB |
7 | * Copyright 2009 Integrated Device Technology, Inc. |
8 | * Alex Bounine <alexandre.bounine@idt.com> | |
9 | * - Added Port-Write/Error Management initialization and handling | |
10 | * | |
933af4a6 TM |
11 | * Copyright 2009 Sysgo AG |
12 | * Thomas Moll <thomas.moll@sysgo.com> | |
13 | * - Added Input- Output- enable functionality, to allow full communication | |
14 | * | |
eb188d0e MP |
15 | * This program is free software; you can redistribute it and/or modify it |
16 | * under the terms of the GNU General Public License as published by the | |
17 | * Free Software Foundation; either version 2 of the License, or (at your | |
18 | * option) any later version. | |
19 | */ | |
20 | ||
eb188d0e MP |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
23 | ||
24 | #include <linux/delay.h> | |
fa78cc51 | 25 | #include <linux/dma-mapping.h> |
eb188d0e MP |
26 | #include <linux/init.h> |
27 | #include <linux/rio.h> | |
28 | #include <linux/rio_drv.h> | |
29 | #include <linux/rio_ids.h> | |
30 | #include <linux/rio_regs.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/timer.h> | |
fa3dbaa0 | 34 | #include <linux/sched.h> |
de25968c TS |
35 | #include <linux/jiffies.h> |
36 | #include <linux/slab.h> | |
eb188d0e MP |
37 | |
38 | #include "rio.h" | |
39 | ||
e5cabeb3 AB |
40 | static void rio_init_em(struct rio_dev *rdev); |
41 | ||
e6b585ca AB |
42 | struct rio_id_table { |
43 | u16 start; /* logical minimal id */ | |
44 | u32 max; /* max number of IDs in table */ | |
45 | spinlock_t lock; | |
46 | unsigned long table[0]; | |
47 | }; | |
48 | ||
eb188d0e | 49 | static int next_destid = 0; |
af84ca38 | 50 | static int next_comptag = 1; |
eb188d0e | 51 | |
4ed134be | 52 | /** |
de74e00a | 53 | * rio_destid_alloc - Allocate next available destID for given network |
4ed134be | 54 | * @net: RIO network |
de74e00a AB |
55 | * |
56 | * Returns next available device destination ID for the specified RIO network. | |
57 | * Marks allocated ID as one in use. | |
58 | * Returns RIO_INVALID_DESTID if new destID is not available. | |
59 | */ | |
60 | static u16 rio_destid_alloc(struct rio_net *net) | |
61 | { | |
62 | int destid; | |
e6b585ca | 63 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
64 | |
65 | spin_lock(&idtab->lock); | |
4ed134be | 66 | destid = find_first_zero_bit(idtab->table, idtab->max); |
de74e00a AB |
67 | |
68 | if (destid < idtab->max) { | |
de74e00a AB |
69 | set_bit(destid, idtab->table); |
70 | destid += idtab->start; | |
71 | } else | |
72 | destid = RIO_INVALID_DESTID; | |
73 | ||
74 | spin_unlock(&idtab->lock); | |
75 | return (u16)destid; | |
76 | } | |
77 | ||
4ed134be | 78 | /** |
de74e00a | 79 | * rio_destid_reserve - Reserve the specivied destID |
4ed134be AB |
80 | * @net: RIO network |
81 | * @destid: destID to reserve | |
de74e00a AB |
82 | * |
83 | * Tries to reserve the specified destID. | |
76679286 | 84 | * Returns 0 if successful. |
de74e00a AB |
85 | */ |
86 | static int rio_destid_reserve(struct rio_net *net, u16 destid) | |
87 | { | |
88 | int oldbit; | |
e6b585ca | 89 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
90 | |
91 | destid -= idtab->start; | |
92 | spin_lock(&idtab->lock); | |
93 | oldbit = test_and_set_bit(destid, idtab->table); | |
94 | spin_unlock(&idtab->lock); | |
95 | return oldbit; | |
96 | } | |
97 | ||
4ed134be | 98 | /** |
de74e00a | 99 | * rio_destid_free - free a previously allocated destID |
4ed134be AB |
100 | * @net: RIO network |
101 | * @destid: destID to free | |
de74e00a AB |
102 | * |
103 | * Makes the specified destID available for use. | |
104 | */ | |
105 | static void rio_destid_free(struct rio_net *net, u16 destid) | |
106 | { | |
e6b585ca | 107 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
108 | |
109 | destid -= idtab->start; | |
110 | spin_lock(&idtab->lock); | |
111 | clear_bit(destid, idtab->table); | |
112 | spin_unlock(&idtab->lock); | |
113 | } | |
114 | ||
4ed134be | 115 | /** |
de74e00a | 116 | * rio_destid_first - return first destID in use |
4ed134be | 117 | * @net: RIO network |
de74e00a AB |
118 | */ |
119 | static u16 rio_destid_first(struct rio_net *net) | |
120 | { | |
121 | int destid; | |
e6b585ca | 122 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
123 | |
124 | spin_lock(&idtab->lock); | |
125 | destid = find_first_bit(idtab->table, idtab->max); | |
126 | if (destid >= idtab->max) | |
127 | destid = RIO_INVALID_DESTID; | |
128 | else | |
129 | destid += idtab->start; | |
130 | spin_unlock(&idtab->lock); | |
131 | return (u16)destid; | |
132 | } | |
133 | ||
4ed134be | 134 | /** |
de74e00a | 135 | * rio_destid_next - return next destID in use |
4ed134be AB |
136 | * @net: RIO network |
137 | * @from: destination ID from which search shall continue | |
de74e00a AB |
138 | */ |
139 | static u16 rio_destid_next(struct rio_net *net, u16 from) | |
140 | { | |
141 | int destid; | |
e6b585ca | 142 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
143 | |
144 | spin_lock(&idtab->lock); | |
145 | destid = find_next_bit(idtab->table, idtab->max, from); | |
146 | if (destid >= idtab->max) | |
147 | destid = RIO_INVALID_DESTID; | |
148 | else | |
149 | destid += idtab->start; | |
150 | spin_unlock(&idtab->lock); | |
151 | return (u16)destid; | |
152 | } | |
153 | ||
eb188d0e MP |
154 | /** |
155 | * rio_get_device_id - Get the base/extended device id for a device | |
156 | * @port: RIO master port | |
157 | * @destid: Destination ID of device | |
158 | * @hopcount: Hopcount to device | |
159 | * | |
160 | * Reads the base/extended device id from a device. Returns the | |
161 | * 8/16-bit device ID. | |
162 | */ | |
163 | static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) | |
164 | { | |
165 | u32 result; | |
166 | ||
167 | rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); | |
168 | ||
e0423236 | 169 | return RIO_GET_DID(port->sys_size, result); |
eb188d0e MP |
170 | } |
171 | ||
172 | /** | |
173 | * rio_set_device_id - Set the base/extended device id for a device | |
174 | * @port: RIO master port | |
175 | * @destid: Destination ID of device | |
176 | * @hopcount: Hopcount to device | |
177 | * @did: Device ID value to be written | |
178 | * | |
179 | * Writes the base/extended device id from a device. | |
180 | */ | |
fa78cc51 | 181 | static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) |
eb188d0e MP |
182 | { |
183 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
e0423236 | 184 | RIO_SET_DID(port->sys_size, did)); |
eb188d0e MP |
185 | } |
186 | ||
eb188d0e MP |
187 | /** |
188 | * rio_clear_locks- Release all host locks and signal enumeration complete | |
a7071efc | 189 | * @net: RIO network to run on |
eb188d0e MP |
190 | * |
191 | * Marks the component tag CSR on each device with the enumeration | |
192 | * complete flag. When complete, it then release the host locks on | |
193 | * each device. Returns 0 on success or %-EINVAL on failure. | |
194 | */ | |
a7071efc | 195 | static int rio_clear_locks(struct rio_net *net) |
eb188d0e | 196 | { |
a7071efc | 197 | struct rio_mport *port = net->hport; |
eb188d0e MP |
198 | struct rio_dev *rdev; |
199 | u32 result; | |
200 | int ret = 0; | |
201 | ||
eb188d0e MP |
202 | /* Release host device id locks */ |
203 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
204 | port->host_deviceid); | |
205 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
206 | if ((result & 0xffff) != 0xffff) { | |
207 | printk(KERN_INFO | |
208 | "RIO: badness when releasing host lock on master port, result %8.8x\n", | |
209 | result); | |
210 | ret = -EINVAL; | |
211 | } | |
a7071efc | 212 | list_for_each_entry(rdev, &net->devices, net_list) { |
eb188d0e MP |
213 | rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, |
214 | port->host_deviceid); | |
215 | rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); | |
216 | if ((result & 0xffff) != 0xffff) { | |
217 | printk(KERN_INFO | |
218 | "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", | |
219 | rdev->vid, rdev->did); | |
220 | ret = -EINVAL; | |
221 | } | |
af84ca38 AB |
222 | |
223 | /* Mark device as discovered and enable master */ | |
224 | rio_read_config_32(rdev, | |
225 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
226 | &result); | |
227 | result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; | |
228 | rio_write_config_32(rdev, | |
229 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
230 | result); | |
eb188d0e MP |
231 | } |
232 | ||
233 | return ret; | |
234 | } | |
235 | ||
236 | /** | |
237 | * rio_enum_host- Set host lock and initialize host destination ID | |
238 | * @port: Master port to issue transaction | |
239 | * | |
240 | * Sets the local host master port lock and destination ID register | |
241 | * with the host device ID value. The host device ID value is provided | |
242 | * by the platform. Returns %0 on success or %-1 on failure. | |
243 | */ | |
244 | static int rio_enum_host(struct rio_mport *port) | |
245 | { | |
246 | u32 result; | |
247 | ||
248 | /* Set master port host device id lock */ | |
249 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
250 | port->host_deviceid); | |
251 | ||
252 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
253 | if ((result & 0xffff) != port->host_deviceid) | |
254 | return -1; | |
255 | ||
256 | /* Set master port destid and init destid ctr */ | |
257 | rio_local_set_device_id(port, port->host_deviceid); | |
eb188d0e MP |
258 | return 0; |
259 | } | |
260 | ||
261 | /** | |
262 | * rio_device_has_destid- Test if a device contains a destination ID register | |
263 | * @port: Master port to issue transaction | |
264 | * @src_ops: RIO device source operations | |
265 | * @dst_ops: RIO device destination operations | |
266 | * | |
267 | * Checks the provided @src_ops and @dst_ops for the necessary transaction | |
268 | * capabilities that indicate whether or not a device will implement a | |
269 | * destination ID register. Returns 1 if true or 0 if false. | |
270 | */ | |
271 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
272 | int dst_ops) | |
273 | { | |
fa78cc51 MP |
274 | 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; |
275 | ||
276 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
277 | } |
278 | ||
279 | /** | |
280 | * rio_release_dev- Frees a RIO device struct | |
281 | * @dev: LDM device associated with a RIO device struct | |
282 | * | |
283 | * Gets the RIO device struct associated a RIO device struct. | |
284 | * The RIO device struct is freed. | |
285 | */ | |
286 | static void rio_release_dev(struct device *dev) | |
287 | { | |
288 | struct rio_dev *rdev; | |
289 | ||
290 | rdev = to_rio_dev(dev); | |
291 | kfree(rdev); | |
292 | } | |
293 | ||
294 | /** | |
295 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
296 | * @rdev: RIO device | |
297 | * | |
298 | * Gets the RIO device Processing Element Features register | |
299 | * contents and tests for switch capabilities. Returns 1 if | |
300 | * the device is a switch or 0 if it is not a switch. | |
301 | * The RIO device struct is freed. | |
302 | */ | |
303 | static int rio_is_switch(struct rio_dev *rdev) | |
304 | { | |
305 | if (rdev->pef & RIO_PEF_SWITCH) | |
306 | return 1; | |
307 | return 0; | |
308 | } | |
309 | ||
eb188d0e MP |
310 | /** |
311 | * rio_setup_device- Allocates and sets up a RIO device | |
312 | * @net: RIO network | |
313 | * @port: Master port to send transactions | |
314 | * @destid: Current destination ID | |
315 | * @hopcount: Current hopcount | |
316 | * @do_enum: Enumeration/Discovery mode flag | |
317 | * | |
318 | * Allocates a RIO device and configures fields based on configuration | |
319 | * space contents. If device has a destination ID register, a destination | |
320 | * ID is either assigned in enumeration mode or read from configuration | |
321 | * space in discovery mode. If the device has switch capabilities, then | |
322 | * a switch is allocated and configured appropriately. Returns a pointer | |
323 | * to a RIO device on success or NULL on failure. | |
324 | * | |
325 | */ | |
305c891e | 326 | static struct rio_dev *rio_setup_device(struct rio_net *net, |
eb188d0e MP |
327 | struct rio_mport *port, u16 destid, |
328 | u8 hopcount, int do_enum) | |
329 | { | |
5f28c520 | 330 | int ret = 0; |
eb188d0e | 331 | struct rio_dev *rdev; |
5f28c520 | 332 | struct rio_switch *rswitch = NULL; |
eb188d0e | 333 | int result, rdid; |
ded05782 AB |
334 | size_t size; |
335 | u32 swpinfo = 0; | |
eb188d0e | 336 | |
ded05782 AB |
337 | size = sizeof(struct rio_dev); |
338 | if (rio_mport_read_config_32(port, destid, hopcount, | |
339 | RIO_PEF_CAR, &result)) | |
340 | return NULL; | |
341 | ||
342 | if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) { | |
343 | rio_mport_read_config_32(port, destid, hopcount, | |
344 | RIO_SWP_INFO_CAR, &swpinfo); | |
345 | if (result & RIO_PEF_SWITCH) { | |
346 | size += (RIO_GET_TOTAL_PORTS(swpinfo) * | |
347 | sizeof(rswitch->nextdev[0])) + sizeof(*rswitch); | |
348 | } | |
349 | } | |
350 | ||
351 | rdev = kzalloc(size, GFP_KERNEL); | |
eb188d0e | 352 | if (!rdev) |
5f28c520 | 353 | return NULL; |
eb188d0e | 354 | |
eb188d0e | 355 | rdev->net = net; |
ded05782 AB |
356 | rdev->pef = result; |
357 | rdev->swpinfo = swpinfo; | |
eb188d0e MP |
358 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, |
359 | &result); | |
360 | rdev->did = result >> 16; | |
361 | rdev->vid = result & 0xffff; | |
362 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, | |
363 | &rdev->device_rev); | |
364 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, | |
365 | &result); | |
366 | rdev->asm_did = result >> 16; | |
367 | rdev->asm_vid = result & 0xffff; | |
368 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, | |
369 | &result); | |
370 | rdev->asm_rev = result >> 16; | |
e5cabeb3 | 371 | if (rdev->pef & RIO_PEF_EXT_FEATURES) { |
eb188d0e | 372 | rdev->efptr = result & 0xffff; |
e5cabeb3 | 373 | rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid, |
1ae842de AB |
374 | hopcount, &rdev->phys_rmap); |
375 | pr_debug("RIO: %s Register Map %d device\n", | |
376 | __func__, rdev->phys_rmap); | |
e5cabeb3 AB |
377 | |
378 | rdev->em_efptr = rio_mport_get_feature(port, 0, destid, | |
379 | hopcount, RIO_EFB_ERR_MGMNT); | |
1ae842de AB |
380 | if (!rdev->em_efptr) |
381 | rdev->em_efptr = rio_mport_get_feature(port, 0, destid, | |
382 | hopcount, RIO_EFB_ERR_MGMNT_HS); | |
e5cabeb3 | 383 | } |
eb188d0e MP |
384 | |
385 | rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, | |
386 | &rdev->src_ops); | |
387 | rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, | |
388 | &rdev->dst_ops); | |
389 | ||
af84ca38 AB |
390 | if (do_enum) { |
391 | /* Assign component tag to device */ | |
392 | if (next_comptag >= 0x10000) { | |
393 | pr_err("RIO: Component Tag Counter Overflow\n"); | |
394 | goto cleanup; | |
395 | } | |
396 | rio_mport_write_config_32(port, destid, hopcount, | |
397 | RIO_COMPONENT_TAG_CSR, next_comptag); | |
398 | rdev->comp_tag = next_comptag++; | |
2ec3ba69 | 399 | rdev->do_enum = true; |
558bda65 AB |
400 | } else { |
401 | rio_mport_read_config_32(port, destid, hopcount, | |
402 | RIO_COMPONENT_TAG_CSR, | |
403 | &rdev->comp_tag); | |
af84ca38 AB |
404 | } |
405 | ||
c70555b0 AB |
406 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
407 | if (do_enum) { | |
408 | rio_set_device_id(port, destid, hopcount, next_destid); | |
de74e00a AB |
409 | rdev->destid = next_destid; |
410 | next_destid = rio_destid_alloc(net); | |
c70555b0 AB |
411 | } else |
412 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
a93192a5 AB |
413 | |
414 | rdev->hopcount = 0xff; | |
415 | } else { | |
416 | /* Switch device has an associated destID which | |
417 | * will be adjusted later | |
418 | */ | |
419 | rdev->destid = destid; | |
420 | rdev->hopcount = hopcount; | |
421 | } | |
eb188d0e MP |
422 | |
423 | /* If a PE has both switch and other functions, show it as a switch */ | |
424 | if (rio_is_switch(rdev)) { | |
ded05782 | 425 | rswitch = rdev->rswitch; |
e5cabeb3 | 426 | rswitch->port_ok = 0; |
2ec3ba69 | 427 | spin_lock_init(&rswitch->lock); |
e0423236 ZW |
428 | rswitch->route_table = kzalloc(sizeof(u8)* |
429 | RIO_MAX_ROUTE_ENTRIES(port->sys_size), | |
430 | GFP_KERNEL); | |
5f28c520 YL |
431 | if (!rswitch->route_table) |
432 | goto cleanup; | |
eb188d0e | 433 | /* Initialize switch route table */ |
e0423236 ZW |
434 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); |
435 | rdid++) | |
eb188d0e | 436 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; |
b53c7583 | 437 | dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, |
6ca40c25 | 438 | rdev->comp_tag & RIO_CTAG_UDEVID); |
eb188d0e | 439 | |
2ec3ba69 AB |
440 | if (do_enum) |
441 | rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0); | |
933af4a6 TM |
442 | } else { |
443 | if (do_enum) | |
1ae842de | 444 | /*Enable Input Output Port (transmitter receiver)*/ |
933af4a6 TM |
445 | rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); |
446 | ||
b53c7583 | 447 | dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, |
6ca40c25 | 448 | rdev->comp_tag & RIO_CTAG_UDEVID); |
933af4a6 | 449 | } |
eb188d0e | 450 | |
e6b585ca | 451 | rdev->dev.parent = &net->dev; |
a11650e1 | 452 | rio_attach_device(rdev); |
eb188d0e | 453 | rdev->dev.release = rio_release_dev; |
284901a9 | 454 | rdev->dma_mask = DMA_BIT_MASK(32); |
fa78cc51 | 455 | rdev->dev.dma_mask = &rdev->dma_mask; |
284901a9 | 456 | rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
eb188d0e | 457 | |
284fb68d | 458 | if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) |
eb188d0e MP |
459 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], |
460 | 0, 0xffff); | |
461 | ||
5f28c520 YL |
462 | ret = rio_add_device(rdev); |
463 | if (ret) | |
464 | goto cleanup; | |
eb188d0e | 465 | |
b74ec56e AB |
466 | rio_dev_get(rdev); |
467 | ||
eb188d0e | 468 | return rdev; |
5f28c520 YL |
469 | |
470 | cleanup: | |
166c050b | 471 | if (rswitch) |
5f28c520 | 472 | kfree(rswitch->route_table); |
ded05782 | 473 | |
5f28c520 YL |
474 | kfree(rdev); |
475 | return NULL; | |
eb188d0e MP |
476 | } |
477 | ||
478 | /** | |
479 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
1ae842de AB |
480 | * @rdev: RapidIO device object |
481 | * @sp: Switch port number | |
eb188d0e MP |
482 | * |
483 | * Reads the port error status CSR for a particular switch port to | |
484 | * determine if the port has an active link. Returns | |
e5cabeb3 | 485 | * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is |
eb188d0e MP |
486 | * inactive. |
487 | */ | |
488 | static int | |
1ae842de | 489 | rio_sport_is_active(struct rio_dev *rdev, int sp) |
eb188d0e | 490 | { |
e5cabeb3 | 491 | u32 result = 0; |
eb188d0e | 492 | |
1ae842de AB |
493 | rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp), |
494 | &result); | |
eb188d0e | 495 | |
e5cabeb3 | 496 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
497 | } |
498 | ||
eb188d0e MP |
499 | /** |
500 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
501 | * @port: Master port to send transaction | |
502 | * @hopcount: Number of hops to the device | |
503 | * | |
504 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
505 | * RIO device. Returns the value of the lock register. | |
506 | */ | |
507 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
508 | { | |
509 | u32 result; | |
510 | ||
e0423236 | 511 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, |
eb188d0e MP |
512 | RIO_HOST_DID_LOCK_CSR, &result); |
513 | ||
514 | return (u16) (result & 0xffff); | |
515 | } | |
516 | ||
eb188d0e MP |
517 | /** |
518 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
519 | * @net: RIO network being enumerated | |
520 | * @port: Master port to send transactions | |
521 | * @hopcount: Number of hops into the network | |
68fe4df5 AB |
522 | * @prev: Previous RIO device connected to the enumerated one |
523 | * @prev_port: Port on previous RIO device | |
eb188d0e MP |
524 | * |
525 | * Recursively enumerates a RIO network. Transactions are sent via the | |
526 | * master port passed in @port. | |
527 | */ | |
305c891e | 528 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, |
68fe4df5 | 529 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e | 530 | { |
eb188d0e | 531 | struct rio_dev *rdev; |
af84ca38 | 532 | u32 regval; |
eb188d0e MP |
533 | int tmp; |
534 | ||
e274e0ed AB |
535 | if (rio_mport_chk_dev_access(port, |
536 | RIO_ANY_DESTID(port->sys_size), hopcount)) { | |
537 | pr_debug("RIO: device access check failed\n"); | |
538 | return -1; | |
539 | } | |
540 | ||
eb188d0e MP |
541 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { |
542 | pr_debug("RIO: PE already discovered by this host\n"); | |
543 | /* | |
544 | * Already discovered by this host. Add it as another | |
af84ca38 | 545 | * link to the existing device. |
eb188d0e | 546 | */ |
af84ca38 AB |
547 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), |
548 | hopcount, RIO_COMPONENT_TAG_CSR, ®val); | |
549 | ||
550 | if (regval) { | |
551 | rdev = rio_get_comptag((regval & 0xffff), NULL); | |
552 | ||
553 | if (rdev && prev && rio_is_switch(prev)) { | |
554 | pr_debug("RIO: redundant path to %s\n", | |
555 | rio_name(rdev)); | |
556 | prev->rswitch->nextdev[prev_port] = rdev; | |
557 | } | |
558 | } | |
559 | ||
eb188d0e MP |
560 | return 0; |
561 | } | |
562 | ||
563 | /* Attempt to acquire device lock */ | |
e0423236 ZW |
564 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
565 | hopcount, | |
eb188d0e MP |
566 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); |
567 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
568 | < port->host_deviceid) { | |
569 | /* Delay a bit */ | |
570 | mdelay(1); | |
571 | /* Attempt to acquire device lock again */ | |
e0423236 ZW |
572 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
573 | hopcount, | |
eb188d0e MP |
574 | RIO_HOST_DID_LOCK_CSR, |
575 | port->host_deviceid); | |
576 | } | |
577 | ||
578 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
579 | pr_debug( | |
580 | "RIO: PE locked by a higher priority host...retreating\n"); | |
581 | return -1; | |
582 | } | |
583 | ||
584 | /* Setup new RIO device */ | |
e0423236 ZW |
585 | rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), |
586 | hopcount, 1); | |
587 | if (rdev) { | |
68fe4df5 AB |
588 | rdev->prev = prev; |
589 | if (prev && rio_is_switch(prev)) | |
590 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
591 | } else |
592 | return -1; | |
593 | ||
594 | if (rio_is_switch(rdev)) { | |
de74e00a AB |
595 | int sw_destid; |
596 | int cur_destid; | |
597 | int sw_inport; | |
598 | u16 destid; | |
599 | int port_num; | |
600 | ||
ae05cbd5 | 601 | sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); |
a93192a5 | 602 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
818a04a0 | 603 | port->host_deviceid, sw_inport, 0); |
c70555b0 | 604 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; |
eb188d0e | 605 | |
de74e00a AB |
606 | destid = rio_destid_first(net); |
607 | while (destid != RIO_INVALID_DESTID && destid < next_destid) { | |
608 | if (destid != port->host_deviceid) { | |
609 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, | |
610 | destid, sw_inport, 0); | |
611 | rdev->rswitch->route_table[destid] = sw_inport; | |
612 | } | |
613 | destid = rio_destid_next(net, destid + 1); | |
eb188d0e | 614 | } |
eb188d0e MP |
615 | pr_debug( |
616 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
617 | rio_name(rdev), rdev->vid, rdev->did, |
618 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
c70555b0 | 619 | sw_destid = next_destid; |
68fe4df5 AB |
620 | for (port_num = 0; |
621 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
622 | port_num++) { | |
8d4630dc AB |
623 | if (sw_inport == port_num) { |
624 | rio_enable_rx_tx_port(port, 0, | |
933af4a6 TM |
625 | RIO_ANY_DESTID(port->sys_size), |
626 | hopcount, port_num); | |
e5cabeb3 | 627 | rdev->rswitch->port_ok |= (1 << port_num); |
eb188d0e | 628 | continue; |
e5cabeb3 | 629 | } |
eb188d0e MP |
630 | |
631 | cur_destid = next_destid; | |
632 | ||
1ae842de | 633 | if (rio_sport_is_active(rdev, port_num)) { |
eb188d0e MP |
634 | pr_debug( |
635 | "RIO: scanning device on port %d\n", | |
636 | port_num); | |
8d4630dc AB |
637 | rio_enable_rx_tx_port(port, 0, |
638 | RIO_ANY_DESTID(port->sys_size), | |
639 | hopcount, port_num); | |
e5cabeb3 | 640 | rdev->rswitch->port_ok |= (1 << port_num); |
a93192a5 | 641 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
e0423236 | 642 | RIO_ANY_DESTID(port->sys_size), |
818a04a0 | 643 | port_num, 0); |
eb188d0e | 644 | |
68fe4df5 AB |
645 | if (rio_enum_peer(net, port, hopcount + 1, |
646 | rdev, port_num) < 0) | |
eb188d0e MP |
647 | return -1; |
648 | ||
649 | /* Update routing tables */ | |
de74e00a AB |
650 | destid = rio_destid_next(net, cur_destid + 1); |
651 | if (destid != RIO_INVALID_DESTID) { | |
eb188d0e | 652 | for (destid = cur_destid; |
de74e00a AB |
653 | destid < next_destid;) { |
654 | if (destid != port->host_deviceid) { | |
655 | rio_route_add_entry(rdev, | |
eb188d0e MP |
656 | RIO_GLOBAL_TABLE, |
657 | destid, | |
818a04a0 AB |
658 | port_num, |
659 | 0); | |
de74e00a AB |
660 | rdev->rswitch-> |
661 | route_table[destid] = | |
662 | port_num; | |
663 | } | |
664 | destid = rio_destid_next(net, | |
665 | destid + 1); | |
eb188d0e | 666 | } |
eb188d0e | 667 | } |
e5cabeb3 AB |
668 | } else { |
669 | /* If switch supports Error Management, | |
670 | * set PORT_LOCKOUT bit for unused port | |
671 | */ | |
672 | if (rdev->em_efptr) | |
673 | rio_set_port_lockout(rdev, port_num, 1); | |
674 | ||
675 | rdev->rswitch->port_ok &= ~(1 << port_num); | |
eb188d0e MP |
676 | } |
677 | } | |
c70555b0 | 678 | |
e5cabeb3 AB |
679 | /* Direct Port-write messages to the enumeratiing host */ |
680 | if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && | |
681 | (rdev->em_efptr)) { | |
682 | rio_write_config_32(rdev, | |
683 | rdev->em_efptr + RIO_EM_PW_TGT_DEVID, | |
684 | (port->host_deviceid << 16) | | |
685 | (port->sys_size << 15)); | |
686 | } | |
687 | ||
688 | rio_init_em(rdev); | |
689 | ||
c70555b0 | 690 | /* Check for empty switch */ |
de74e00a AB |
691 | if (next_destid == sw_destid) |
692 | next_destid = rio_destid_alloc(net); | |
c70555b0 | 693 | |
a93192a5 | 694 | rdev->destid = sw_destid; |
eb188d0e MP |
695 | } else |
696 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
697 | rio_name(rdev), rdev->vid, rdev->did); | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | /** | |
703 | * rio_enum_complete- Tests if enumeration of a network is complete | |
704 | * @port: Master port to send transaction | |
705 | * | |
a571259f | 706 | * Tests the PGCCSR discovered bit for non-zero value (enumeration |
e5cabeb3 | 707 | * complete flag). Return %1 if enumeration is complete or %0 if |
eb188d0e MP |
708 | * enumeration is incomplete. |
709 | */ | |
710 | static int rio_enum_complete(struct rio_mport *port) | |
711 | { | |
af84ca38 | 712 | u32 regval; |
eb188d0e | 713 | |
af84ca38 AB |
714 | rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, |
715 | ®val); | |
a571259f | 716 | return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0; |
eb188d0e MP |
717 | } |
718 | ||
719 | /** | |
720 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
721 | * @net: RIO network being discovered | |
722 | * @port: Master port to send transactions | |
723 | * @destid: Current destination ID in network | |
724 | * @hopcount: Number of hops into the network | |
9b310acc RD |
725 | * @prev: previous rio_dev |
726 | * @prev_port: previous port number | |
eb188d0e MP |
727 | * |
728 | * Recursively discovers a RIO network. Transactions are sent via the | |
729 | * master port passed in @port. | |
730 | */ | |
305c891e | 731 | static int |
eb188d0e | 732 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, |
17e96205 | 733 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e MP |
734 | { |
735 | u8 port_num, route_port; | |
eb188d0e MP |
736 | struct rio_dev *rdev; |
737 | u16 ndestid; | |
738 | ||
739 | /* Setup new RIO device */ | |
740 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
17e96205 AB |
741 | rdev->prev = prev; |
742 | if (prev && rio_is_switch(prev)) | |
743 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
744 | } else |
745 | return -1; | |
746 | ||
747 | if (rio_is_switch(rdev)) { | |
eb188d0e | 748 | /* Associated destid is how we accessed this switch */ |
a93192a5 | 749 | rdev->destid = destid; |
eb188d0e | 750 | |
eb188d0e MP |
751 | pr_debug( |
752 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
753 | rio_name(rdev), rdev->vid, rdev->did, |
754 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
755 | for (port_num = 0; | |
756 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
757 | port_num++) { | |
ae05cbd5 | 758 | if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) |
eb188d0e MP |
759 | continue; |
760 | ||
1ae842de | 761 | if (rio_sport_is_active(rdev, port_num)) { |
eb188d0e MP |
762 | pr_debug( |
763 | "RIO: scanning device on port %d\n", | |
764 | port_num); | |
818a04a0 AB |
765 | |
766 | rio_lock_device(port, destid, hopcount, 1000); | |
767 | ||
e0423236 ZW |
768 | for (ndestid = 0; |
769 | ndestid < RIO_ANY_DESTID(port->sys_size); | |
eb188d0e | 770 | ndestid++) { |
a93192a5 | 771 | rio_route_get_entry(rdev, |
eb188d0e MP |
772 | RIO_GLOBAL_TABLE, |
773 | ndestid, | |
818a04a0 | 774 | &route_port, 0); |
eb188d0e MP |
775 | if (route_port == port_num) |
776 | break; | |
777 | } | |
778 | ||
af84ca38 AB |
779 | if (ndestid == RIO_ANY_DESTID(port->sys_size)) |
780 | continue; | |
818a04a0 | 781 | rio_unlock_device(port, destid, hopcount); |
17e96205 AB |
782 | if (rio_disc_peer(net, port, ndestid, |
783 | hopcount + 1, rdev, port_num) < 0) | |
eb188d0e MP |
784 | return -1; |
785 | } | |
786 | } | |
787 | } else | |
788 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
789 | rio_name(rdev), rdev->vid, rdev->did); | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
794 | /** | |
795 | * rio_mport_is_active- Tests if master port link is active | |
796 | * @port: Master port to test | |
797 | * | |
798 | * Reads the port error status CSR for the master port to | |
799 | * determine if the port has an active link. Returns | |
e5cabeb3 | 800 | * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active |
eb188d0e MP |
801 | * or %0 if it is inactive. |
802 | */ | |
803 | static int rio_mport_is_active(struct rio_mport *port) | |
804 | { | |
805 | u32 result = 0; | |
eb188d0e | 806 | |
1ae842de AB |
807 | rio_local_read_config_32(port, |
808 | port->phys_efptr + | |
809 | RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap), | |
810 | &result); | |
e5cabeb3 | 811 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
812 | } |
813 | ||
e6b585ca AB |
814 | static void rio_scan_release_net(struct rio_net *net) |
815 | { | |
816 | pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id); | |
817 | kfree(net->enum_data); | |
818 | } | |
819 | ||
820 | static void rio_scan_release_dev(struct device *dev) | |
821 | { | |
822 | struct rio_net *net; | |
823 | ||
824 | net = to_rio_net(dev); | |
825 | pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id); | |
826 | kfree(net); | |
827 | } | |
828 | ||
829 | /* | |
830 | * rio_scan_alloc_net - Allocate and configure a new RIO network | |
831 | * @mport: Master port associated with the RIO network | |
de74e00a AB |
832 | * @do_enum: Enumeration/Discovery mode flag |
833 | * @start: logical minimal start id for new net | |
eb188d0e | 834 | * |
e6b585ca AB |
835 | * Allocates a new RIO network structure and initializes enumerator-specific |
836 | * part of it (if required). | |
837 | * Returns a RIO network pointer on success or %NULL on failure. | |
eb188d0e | 838 | */ |
e6b585ca AB |
839 | static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport, |
840 | int do_enum, u16 start) | |
eb188d0e MP |
841 | { |
842 | struct rio_net *net; | |
843 | ||
e6b585ca AB |
844 | net = rio_alloc_net(mport); |
845 | ||
de74e00a | 846 | if (net && do_enum) { |
e6b585ca AB |
847 | struct rio_id_table *idtab; |
848 | size_t size; | |
849 | ||
850 | size = sizeof(struct rio_id_table) + | |
851 | BITS_TO_LONGS( | |
852 | RIO_MAX_ROUTE_ENTRIES(mport->sys_size) | |
853 | ) * sizeof(long); | |
de74e00a | 854 | |
e6b585ca AB |
855 | idtab = kzalloc(size, GFP_KERNEL); |
856 | ||
857 | if (idtab == NULL) { | |
de74e00a | 858 | pr_err("RIO: failed to allocate destID table\n"); |
e6b585ca | 859 | rio_free_net(net); |
de74e00a AB |
860 | net = NULL; |
861 | } else { | |
e6b585ca AB |
862 | net->enum_data = idtab; |
863 | net->release = rio_scan_release_net; | |
864 | idtab->start = start; | |
865 | idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size); | |
866 | spin_lock_init(&idtab->lock); | |
de74e00a AB |
867 | } |
868 | } | |
869 | ||
eb188d0e | 870 | if (net) { |
e6b585ca AB |
871 | net->id = mport->id; |
872 | net->hport = mport; | |
873 | dev_set_name(&net->dev, "rnet_%d", net->id); | |
874 | net->dev.parent = &mport->dev; | |
875 | net->dev.release = rio_scan_release_dev; | |
876 | rio_add_net(net); | |
eb188d0e | 877 | } |
e6b585ca | 878 | |
eb188d0e MP |
879 | return net; |
880 | } | |
881 | ||
c70555b0 AB |
882 | /** |
883 | * rio_update_route_tables- Updates route tables in switches | |
a7071efc | 884 | * @net: RIO network to run update on |
c70555b0 AB |
885 | * |
886 | * For each enumerated device, ensure that each switch in a system | |
887 | * has correct routing entries. Add routes for devices that where | |
888 | * unknown dirung the first enumeration pass through the switch. | |
889 | */ | |
a7071efc | 890 | static void rio_update_route_tables(struct rio_net *net) |
c70555b0 | 891 | { |
ded05782 | 892 | struct rio_dev *rdev, *swrdev; |
c70555b0 AB |
893 | struct rio_switch *rswitch; |
894 | u8 sport; | |
895 | u16 destid; | |
896 | ||
a7071efc | 897 | list_for_each_entry(rdev, &net->devices, net_list) { |
c70555b0 | 898 | |
a93192a5 | 899 | destid = rdev->destid; |
c70555b0 | 900 | |
a7071efc | 901 | list_for_each_entry(rswitch, &net->switches, node) { |
c70555b0 AB |
902 | |
903 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
904 | continue; | |
905 | ||
906 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
ded05782 AB |
907 | swrdev = sw_to_rio_dev(rswitch); |
908 | ||
07590ff0 | 909 | /* Skip if destid ends in empty switch*/ |
ded05782 | 910 | if (swrdev->destid == destid) |
07590ff0 | 911 | continue; |
c70555b0 | 912 | |
ded05782 | 913 | sport = RIO_GET_PORT_NUM(swrdev->swpinfo); |
c70555b0 | 914 | |
2ec3ba69 AB |
915 | rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE, |
916 | destid, sport, 0); | |
917 | rswitch->route_table[destid] = sport; | |
c70555b0 AB |
918 | } |
919 | } | |
920 | } | |
921 | } | |
922 | ||
e5cabeb3 AB |
923 | /** |
924 | * rio_init_em - Initializes RIO Error Management (for switches) | |
97ef6f74 | 925 | * @rdev: RIO device |
e5cabeb3 AB |
926 | * |
927 | * For each enumerated switch, call device-specific error management | |
928 | * initialization routine (if supplied by the switch driver). | |
929 | */ | |
930 | static void rio_init_em(struct rio_dev *rdev) | |
931 | { | |
932 | if (rio_is_switch(rdev) && (rdev->em_efptr) && | |
2ec3ba69 AB |
933 | rdev->rswitch->ops && rdev->rswitch->ops->em_init) { |
934 | rdev->rswitch->ops->em_init(rdev); | |
e5cabeb3 AB |
935 | } |
936 | } | |
937 | ||
eb188d0e MP |
938 | /** |
939 | * rio_enum_mport- Start enumeration through a master port | |
940 | * @mport: Master port to send transactions | |
bc8fcfea | 941 | * @flags: Enumeration control flags |
eb188d0e MP |
942 | * |
943 | * Starts the enumeration process. If somebody has enumerated our | |
944 | * master port device, then give up. If not and we have an active | |
945 | * link, then start recursive peer enumeration. Returns %0 if | |
946 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
947 | */ | |
36f0efbb | 948 | static int rio_enum_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
949 | { |
950 | struct rio_net *net = NULL; | |
951 | int rc = 0; | |
952 | ||
953 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
954 | mport->name); | |
bc8fcfea AB |
955 | |
956 | /* | |
957 | * To avoid multiple start requests (repeat enumeration is not supported | |
958 | * by this method) check if enumeration/discovery was performed for this | |
959 | * mport: if mport was added into the list of mports for a net exit | |
960 | * with error. | |
961 | */ | |
962 | if (mport->nnode.next || mport->nnode.prev) | |
963 | return -EBUSY; | |
964 | ||
eb188d0e MP |
965 | /* If somebody else enumerated our master port device, bail. */ |
966 | if (rio_enum_host(mport) < 0) { | |
967 | printk(KERN_INFO | |
968 | "RIO: master port %d device has been enumerated by a remote host\n", | |
969 | mport->id); | |
970 | rc = -EBUSY; | |
971 | goto out; | |
972 | } | |
973 | ||
974 | /* If master port has an active link, allocate net and enum peers */ | |
975 | if (rio_mport_is_active(mport)) { | |
e6b585ca | 976 | net = rio_scan_alloc_net(mport, 1, 0); |
de74e00a | 977 | if (!net) { |
eb188d0e MP |
978 | printk(KERN_ERR "RIO: failed to allocate new net\n"); |
979 | rc = -ENOMEM; | |
980 | goto out; | |
981 | } | |
933af4a6 | 982 | |
de74e00a AB |
983 | /* reserve mport destID in new net */ |
984 | rio_destid_reserve(net, mport->host_deviceid); | |
985 | ||
933af4a6 TM |
986 | /* Enable Input Output Port (transmitter reviever) */ |
987 | rio_enable_rx_tx_port(mport, 1, 0, 0, 0); | |
988 | ||
af84ca38 AB |
989 | /* Set component tag for host */ |
990 | rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, | |
991 | next_comptag++); | |
992 | ||
de74e00a AB |
993 | next_destid = rio_destid_alloc(net); |
994 | ||
68fe4df5 | 995 | if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { |
eb188d0e MP |
996 | /* A higher priority host won enumeration, bail. */ |
997 | printk(KERN_INFO | |
998 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
999 | mport->id); | |
a7071efc | 1000 | rio_clear_locks(net); |
eb188d0e MP |
1001 | rc = -EBUSY; |
1002 | goto out; | |
1003 | } | |
de74e00a AB |
1004 | /* free the last allocated destID (unused) */ |
1005 | rio_destid_free(net, next_destid); | |
a7071efc AB |
1006 | rio_update_route_tables(net); |
1007 | rio_clear_locks(net); | |
e5cabeb3 | 1008 | rio_pw_enable(mport, 1); |
eb188d0e MP |
1009 | } else { |
1010 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
1011 | mport->id); | |
1012 | rc = -EINVAL; | |
1013 | } | |
1014 | ||
1015 | out: | |
1016 | return rc; | |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * rio_build_route_tables- Generate route tables from switch route entries | |
a7071efc | 1021 | * @net: RIO network to run route tables scan on |
eb188d0e MP |
1022 | * |
1023 | * For each switch device, generate a route table by copying existing | |
1024 | * route entries from the switch. | |
1025 | */ | |
a7071efc | 1026 | static void rio_build_route_tables(struct rio_net *net) |
eb188d0e | 1027 | { |
a7071efc | 1028 | struct rio_switch *rswitch; |
eb188d0e MP |
1029 | struct rio_dev *rdev; |
1030 | int i; | |
1031 | u8 sport; | |
1032 | ||
a7071efc AB |
1033 | list_for_each_entry(rswitch, &net->switches, node) { |
1034 | rdev = sw_to_rio_dev(rswitch); | |
818a04a0 | 1035 | |
a7071efc AB |
1036 | rio_lock_device(net->hport, rdev->destid, |
1037 | rdev->hopcount, 1000); | |
1038 | for (i = 0; | |
1039 | i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size); | |
1040 | i++) { | |
1041 | if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE, | |
1042 | i, &sport, 0) < 0) | |
1043 | continue; | |
1044 | rswitch->route_table[i] = sport; | |
eb188d0e | 1045 | } |
a7071efc AB |
1046 | |
1047 | rio_unlock_device(net->hport, rdev->destid, rdev->hopcount); | |
1048 | } | |
eb188d0e MP |
1049 | } |
1050 | ||
eb188d0e MP |
1051 | /** |
1052 | * rio_disc_mport- Start discovery through a master port | |
1053 | * @mport: Master port to send transactions | |
bc8fcfea | 1054 | * @flags: discovery control flags |
eb188d0e MP |
1055 | * |
1056 | * Starts the discovery process. If we have an active link, | |
bc8fcfea AB |
1057 | * then wait for the signal that enumeration is complete (if wait |
1058 | * is allowed). | |
eb188d0e MP |
1059 | * When enumeration completion is signaled, start recursive |
1060 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
1061 | * on failure. | |
1062 | */ | |
36f0efbb | 1063 | static int rio_disc_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
1064 | { |
1065 | struct rio_net *net = NULL; | |
fa3dbaa0 | 1066 | unsigned long to_end; |
eb188d0e MP |
1067 | |
1068 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
1069 | mport->name); | |
1070 | ||
1071 | /* If master port has an active link, allocate net and discover peers */ | |
1072 | if (rio_mport_is_active(mport)) { | |
bc8fcfea AB |
1073 | if (rio_enum_complete(mport)) |
1074 | goto enum_done; | |
1075 | else if (flags & RIO_SCAN_ENUM_NO_WAIT) | |
1076 | return -EAGAIN; | |
1077 | ||
fa3dbaa0 | 1078 | pr_debug("RIO: wait for enumeration to complete...\n"); |
eb188d0e | 1079 | |
fa3dbaa0 AB |
1080 | to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; |
1081 | while (time_before(jiffies, to_end)) { | |
1082 | if (rio_enum_complete(mport)) | |
1083 | goto enum_done; | |
f4c9c0e8 | 1084 | msleep(10); |
eb188d0e | 1085 | } |
eb188d0e | 1086 | |
fa3dbaa0 AB |
1087 | pr_debug("RIO: discovery timeout on mport %d %s\n", |
1088 | mport->id, mport->name); | |
1089 | goto bail; | |
1090 | enum_done: | |
1091 | pr_debug("RIO: ... enumeration done\n"); | |
1092 | ||
e6b585ca | 1093 | net = rio_scan_alloc_net(mport, 0, 0); |
fa3dbaa0 AB |
1094 | if (!net) { |
1095 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
1096 | goto bail; | |
1097 | } | |
818a04a0 AB |
1098 | |
1099 | /* Read DestID assigned by enumerator */ | |
1100 | rio_local_read_config_32(mport, RIO_DID_CSR, | |
1101 | &mport->host_deviceid); | |
1102 | mport->host_deviceid = RIO_GET_DID(mport->sys_size, | |
1103 | mport->host_deviceid); | |
1104 | ||
e0423236 | 1105 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), |
17e96205 | 1106 | 0, NULL, 0) < 0) { |
eb188d0e MP |
1107 | printk(KERN_INFO |
1108 | "RIO: master port %d device has failed discovery\n", | |
1109 | mport->id); | |
1110 | goto bail; | |
1111 | } | |
1112 | ||
a7071efc | 1113 | rio_build_route_tables(net); |
eb188d0e MP |
1114 | } |
1115 | ||
1116 | return 0; | |
fa3dbaa0 | 1117 | bail: |
eb188d0e MP |
1118 | return -EBUSY; |
1119 | } | |
a11650e1 AB |
1120 | |
1121 | static struct rio_scan rio_scan_ops = { | |
9edbc30b | 1122 | .owner = THIS_MODULE, |
a11650e1 AB |
1123 | .enumerate = rio_enum_mport, |
1124 | .discover = rio_disc_mport, | |
1125 | }; | |
1126 | ||
1127 | static bool scan; | |
1128 | module_param(scan, bool, 0); | |
1129 | MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery " | |
1130 | "(default = 0)"); | |
1131 | ||
1132 | /** | |
1133 | * rio_basic_attach: | |
1134 | * | |
1135 | * When this enumeration/discovery method is loaded as a module this function | |
1136 | * registers its specific enumeration and discover routines for all available | |
1137 | * RapidIO mport devices. The "scan" command line parameter controls ability of | |
1138 | * the module to start RapidIO enumeration/discovery automatically. | |
1139 | * | |
1140 | * Returns 0 for success or -EIO if unable to register itself. | |
1141 | * | |
1142 | * This enumeration/discovery method cannot be unloaded and therefore does not | |
1143 | * provide a matching cleanup_module routine. | |
1144 | */ | |
1145 | ||
1146 | static int __init rio_basic_attach(void) | |
1147 | { | |
1148 | if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops)) | |
1149 | return -EIO; | |
1150 | if (scan) | |
1151 | rio_init_mports(); | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | late_initcall(rio_basic_attach); | |
1156 | ||
1157 | MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery"); | |
1158 | MODULE_LICENSE("GPL"); |