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 | |
eb188d0e MP |
52 | static int rio_mport_phys_table[] = { |
53 | RIO_EFB_PAR_EP_ID, | |
54 | RIO_EFB_PAR_EP_REC_ID, | |
55 | RIO_EFB_SER_EP_ID, | |
56 | RIO_EFB_SER_EP_REC_ID, | |
57 | -1, | |
58 | }; | |
59 | ||
de74e00a | 60 | |
4ed134be | 61 | /** |
de74e00a | 62 | * rio_destid_alloc - Allocate next available destID for given network |
4ed134be | 63 | * @net: RIO network |
de74e00a AB |
64 | * |
65 | * Returns next available device destination ID for the specified RIO network. | |
66 | * Marks allocated ID as one in use. | |
67 | * Returns RIO_INVALID_DESTID if new destID is not available. | |
68 | */ | |
69 | static u16 rio_destid_alloc(struct rio_net *net) | |
70 | { | |
71 | int destid; | |
e6b585ca | 72 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
73 | |
74 | spin_lock(&idtab->lock); | |
4ed134be | 75 | destid = find_first_zero_bit(idtab->table, idtab->max); |
de74e00a AB |
76 | |
77 | if (destid < idtab->max) { | |
de74e00a AB |
78 | set_bit(destid, idtab->table); |
79 | destid += idtab->start; | |
80 | } else | |
81 | destid = RIO_INVALID_DESTID; | |
82 | ||
83 | spin_unlock(&idtab->lock); | |
84 | return (u16)destid; | |
85 | } | |
86 | ||
4ed134be | 87 | /** |
de74e00a | 88 | * rio_destid_reserve - Reserve the specivied destID |
4ed134be AB |
89 | * @net: RIO network |
90 | * @destid: destID to reserve | |
de74e00a AB |
91 | * |
92 | * Tries to reserve the specified destID. | |
76679286 | 93 | * Returns 0 if successful. |
de74e00a AB |
94 | */ |
95 | static int rio_destid_reserve(struct rio_net *net, u16 destid) | |
96 | { | |
97 | int oldbit; | |
e6b585ca | 98 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
99 | |
100 | destid -= idtab->start; | |
101 | spin_lock(&idtab->lock); | |
102 | oldbit = test_and_set_bit(destid, idtab->table); | |
103 | spin_unlock(&idtab->lock); | |
104 | return oldbit; | |
105 | } | |
106 | ||
4ed134be | 107 | /** |
de74e00a | 108 | * rio_destid_free - free a previously allocated destID |
4ed134be AB |
109 | * @net: RIO network |
110 | * @destid: destID to free | |
de74e00a AB |
111 | * |
112 | * Makes the specified destID available for use. | |
113 | */ | |
114 | static void rio_destid_free(struct rio_net *net, u16 destid) | |
115 | { | |
e6b585ca | 116 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
117 | |
118 | destid -= idtab->start; | |
119 | spin_lock(&idtab->lock); | |
120 | clear_bit(destid, idtab->table); | |
121 | spin_unlock(&idtab->lock); | |
122 | } | |
123 | ||
4ed134be | 124 | /** |
de74e00a | 125 | * rio_destid_first - return first destID in use |
4ed134be | 126 | * @net: RIO network |
de74e00a AB |
127 | */ |
128 | static u16 rio_destid_first(struct rio_net *net) | |
129 | { | |
130 | int destid; | |
e6b585ca | 131 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
132 | |
133 | spin_lock(&idtab->lock); | |
134 | destid = find_first_bit(idtab->table, idtab->max); | |
135 | if (destid >= idtab->max) | |
136 | destid = RIO_INVALID_DESTID; | |
137 | else | |
138 | destid += idtab->start; | |
139 | spin_unlock(&idtab->lock); | |
140 | return (u16)destid; | |
141 | } | |
142 | ||
4ed134be | 143 | /** |
de74e00a | 144 | * rio_destid_next - return next destID in use |
4ed134be AB |
145 | * @net: RIO network |
146 | * @from: destination ID from which search shall continue | |
de74e00a AB |
147 | */ |
148 | static u16 rio_destid_next(struct rio_net *net, u16 from) | |
149 | { | |
150 | int destid; | |
e6b585ca | 151 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
152 | |
153 | spin_lock(&idtab->lock); | |
154 | destid = find_next_bit(idtab->table, idtab->max, from); | |
155 | if (destid >= idtab->max) | |
156 | destid = RIO_INVALID_DESTID; | |
157 | else | |
158 | destid += idtab->start; | |
159 | spin_unlock(&idtab->lock); | |
160 | return (u16)destid; | |
161 | } | |
162 | ||
eb188d0e MP |
163 | /** |
164 | * rio_get_device_id - Get the base/extended device id for a device | |
165 | * @port: RIO master port | |
166 | * @destid: Destination ID of device | |
167 | * @hopcount: Hopcount to device | |
168 | * | |
169 | * Reads the base/extended device id from a device. Returns the | |
170 | * 8/16-bit device ID. | |
171 | */ | |
172 | static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) | |
173 | { | |
174 | u32 result; | |
175 | ||
176 | rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); | |
177 | ||
e0423236 | 178 | return RIO_GET_DID(port->sys_size, result); |
eb188d0e MP |
179 | } |
180 | ||
181 | /** | |
182 | * rio_set_device_id - Set the base/extended device id for a device | |
183 | * @port: RIO master port | |
184 | * @destid: Destination ID of device | |
185 | * @hopcount: Hopcount to device | |
186 | * @did: Device ID value to be written | |
187 | * | |
188 | * Writes the base/extended device id from a device. | |
189 | */ | |
fa78cc51 | 190 | static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) |
eb188d0e MP |
191 | { |
192 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
e0423236 | 193 | RIO_SET_DID(port->sys_size, did)); |
eb188d0e MP |
194 | } |
195 | ||
eb188d0e MP |
196 | /** |
197 | * rio_clear_locks- Release all host locks and signal enumeration complete | |
a7071efc | 198 | * @net: RIO network to run on |
eb188d0e MP |
199 | * |
200 | * Marks the component tag CSR on each device with the enumeration | |
201 | * complete flag. When complete, it then release the host locks on | |
202 | * each device. Returns 0 on success or %-EINVAL on failure. | |
203 | */ | |
a7071efc | 204 | static int rio_clear_locks(struct rio_net *net) |
eb188d0e | 205 | { |
a7071efc | 206 | struct rio_mport *port = net->hport; |
eb188d0e MP |
207 | struct rio_dev *rdev; |
208 | u32 result; | |
209 | int ret = 0; | |
210 | ||
eb188d0e MP |
211 | /* Release host device id locks */ |
212 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
213 | port->host_deviceid); | |
214 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
215 | if ((result & 0xffff) != 0xffff) { | |
216 | printk(KERN_INFO | |
217 | "RIO: badness when releasing host lock on master port, result %8.8x\n", | |
218 | result); | |
219 | ret = -EINVAL; | |
220 | } | |
a7071efc | 221 | list_for_each_entry(rdev, &net->devices, net_list) { |
eb188d0e MP |
222 | rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, |
223 | port->host_deviceid); | |
224 | rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); | |
225 | if ((result & 0xffff) != 0xffff) { | |
226 | printk(KERN_INFO | |
227 | "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", | |
228 | rdev->vid, rdev->did); | |
229 | ret = -EINVAL; | |
230 | } | |
af84ca38 AB |
231 | |
232 | /* Mark device as discovered and enable master */ | |
233 | rio_read_config_32(rdev, | |
234 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
235 | &result); | |
236 | result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; | |
237 | rio_write_config_32(rdev, | |
238 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
239 | result); | |
eb188d0e MP |
240 | } |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | /** | |
246 | * rio_enum_host- Set host lock and initialize host destination ID | |
247 | * @port: Master port to issue transaction | |
248 | * | |
249 | * Sets the local host master port lock and destination ID register | |
250 | * with the host device ID value. The host device ID value is provided | |
251 | * by the platform. Returns %0 on success or %-1 on failure. | |
252 | */ | |
253 | static int rio_enum_host(struct rio_mport *port) | |
254 | { | |
255 | u32 result; | |
256 | ||
257 | /* Set master port host device id lock */ | |
258 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
259 | port->host_deviceid); | |
260 | ||
261 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
262 | if ((result & 0xffff) != port->host_deviceid) | |
263 | return -1; | |
264 | ||
265 | /* Set master port destid and init destid ctr */ | |
266 | rio_local_set_device_id(port, port->host_deviceid); | |
eb188d0e MP |
267 | return 0; |
268 | } | |
269 | ||
270 | /** | |
271 | * rio_device_has_destid- Test if a device contains a destination ID register | |
272 | * @port: Master port to issue transaction | |
273 | * @src_ops: RIO device source operations | |
274 | * @dst_ops: RIO device destination operations | |
275 | * | |
276 | * Checks the provided @src_ops and @dst_ops for the necessary transaction | |
277 | * capabilities that indicate whether or not a device will implement a | |
278 | * destination ID register. Returns 1 if true or 0 if false. | |
279 | */ | |
280 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
281 | int dst_ops) | |
282 | { | |
fa78cc51 MP |
283 | 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; |
284 | ||
285 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
286 | } |
287 | ||
288 | /** | |
289 | * rio_release_dev- Frees a RIO device struct | |
290 | * @dev: LDM device associated with a RIO device struct | |
291 | * | |
292 | * Gets the RIO device struct associated a RIO device struct. | |
293 | * The RIO device struct is freed. | |
294 | */ | |
295 | static void rio_release_dev(struct device *dev) | |
296 | { | |
297 | struct rio_dev *rdev; | |
298 | ||
299 | rdev = to_rio_dev(dev); | |
300 | kfree(rdev); | |
301 | } | |
302 | ||
303 | /** | |
304 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
305 | * @rdev: RIO device | |
306 | * | |
307 | * Gets the RIO device Processing Element Features register | |
308 | * contents and tests for switch capabilities. Returns 1 if | |
309 | * the device is a switch or 0 if it is not a switch. | |
310 | * The RIO device struct is freed. | |
311 | */ | |
312 | static int rio_is_switch(struct rio_dev *rdev) | |
313 | { | |
314 | if (rdev->pef & RIO_PEF_SWITCH) | |
315 | return 1; | |
316 | return 0; | |
317 | } | |
318 | ||
eb188d0e MP |
319 | /** |
320 | * rio_setup_device- Allocates and sets up a RIO device | |
321 | * @net: RIO network | |
322 | * @port: Master port to send transactions | |
323 | * @destid: Current destination ID | |
324 | * @hopcount: Current hopcount | |
325 | * @do_enum: Enumeration/Discovery mode flag | |
326 | * | |
327 | * Allocates a RIO device and configures fields based on configuration | |
328 | * space contents. If device has a destination ID register, a destination | |
329 | * ID is either assigned in enumeration mode or read from configuration | |
330 | * space in discovery mode. If the device has switch capabilities, then | |
331 | * a switch is allocated and configured appropriately. Returns a pointer | |
332 | * to a RIO device on success or NULL on failure. | |
333 | * | |
334 | */ | |
305c891e | 335 | static struct rio_dev *rio_setup_device(struct rio_net *net, |
eb188d0e MP |
336 | struct rio_mport *port, u16 destid, |
337 | u8 hopcount, int do_enum) | |
338 | { | |
5f28c520 | 339 | int ret = 0; |
eb188d0e | 340 | struct rio_dev *rdev; |
5f28c520 | 341 | struct rio_switch *rswitch = NULL; |
eb188d0e | 342 | int result, rdid; |
ded05782 AB |
343 | size_t size; |
344 | u32 swpinfo = 0; | |
eb188d0e | 345 | |
ded05782 AB |
346 | size = sizeof(struct rio_dev); |
347 | if (rio_mport_read_config_32(port, destid, hopcount, | |
348 | RIO_PEF_CAR, &result)) | |
349 | return NULL; | |
350 | ||
351 | if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) { | |
352 | rio_mport_read_config_32(port, destid, hopcount, | |
353 | RIO_SWP_INFO_CAR, &swpinfo); | |
354 | if (result & RIO_PEF_SWITCH) { | |
355 | size += (RIO_GET_TOTAL_PORTS(swpinfo) * | |
356 | sizeof(rswitch->nextdev[0])) + sizeof(*rswitch); | |
357 | } | |
358 | } | |
359 | ||
360 | rdev = kzalloc(size, GFP_KERNEL); | |
eb188d0e | 361 | if (!rdev) |
5f28c520 | 362 | return NULL; |
eb188d0e | 363 | |
eb188d0e | 364 | rdev->net = net; |
ded05782 AB |
365 | rdev->pef = result; |
366 | rdev->swpinfo = swpinfo; | |
eb188d0e MP |
367 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, |
368 | &result); | |
369 | rdev->did = result >> 16; | |
370 | rdev->vid = result & 0xffff; | |
371 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, | |
372 | &rdev->device_rev); | |
373 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, | |
374 | &result); | |
375 | rdev->asm_did = result >> 16; | |
376 | rdev->asm_vid = result & 0xffff; | |
377 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, | |
378 | &result); | |
379 | rdev->asm_rev = result >> 16; | |
e5cabeb3 | 380 | if (rdev->pef & RIO_PEF_EXT_FEATURES) { |
eb188d0e | 381 | rdev->efptr = result & 0xffff; |
e5cabeb3 AB |
382 | rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid, |
383 | hopcount); | |
384 | ||
385 | rdev->em_efptr = rio_mport_get_feature(port, 0, destid, | |
386 | hopcount, RIO_EFB_ERR_MGMNT); | |
387 | } | |
eb188d0e MP |
388 | |
389 | rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, | |
390 | &rdev->src_ops); | |
391 | rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, | |
392 | &rdev->dst_ops); | |
393 | ||
af84ca38 AB |
394 | if (do_enum) { |
395 | /* Assign component tag to device */ | |
396 | if (next_comptag >= 0x10000) { | |
397 | pr_err("RIO: Component Tag Counter Overflow\n"); | |
398 | goto cleanup; | |
399 | } | |
400 | rio_mport_write_config_32(port, destid, hopcount, | |
401 | RIO_COMPONENT_TAG_CSR, next_comptag); | |
402 | rdev->comp_tag = next_comptag++; | |
2ec3ba69 | 403 | rdev->do_enum = true; |
558bda65 AB |
404 | } else { |
405 | rio_mport_read_config_32(port, destid, hopcount, | |
406 | RIO_COMPONENT_TAG_CSR, | |
407 | &rdev->comp_tag); | |
af84ca38 AB |
408 | } |
409 | ||
c70555b0 AB |
410 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
411 | if (do_enum) { | |
412 | rio_set_device_id(port, destid, hopcount, next_destid); | |
de74e00a AB |
413 | rdev->destid = next_destid; |
414 | next_destid = rio_destid_alloc(net); | |
c70555b0 AB |
415 | } else |
416 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
a93192a5 AB |
417 | |
418 | rdev->hopcount = 0xff; | |
419 | } else { | |
420 | /* Switch device has an associated destID which | |
421 | * will be adjusted later | |
422 | */ | |
423 | rdev->destid = destid; | |
424 | rdev->hopcount = hopcount; | |
425 | } | |
eb188d0e MP |
426 | |
427 | /* If a PE has both switch and other functions, show it as a switch */ | |
428 | if (rio_is_switch(rdev)) { | |
ded05782 | 429 | rswitch = rdev->rswitch; |
e5cabeb3 | 430 | rswitch->port_ok = 0; |
2ec3ba69 | 431 | spin_lock_init(&rswitch->lock); |
e0423236 ZW |
432 | rswitch->route_table = kzalloc(sizeof(u8)* |
433 | RIO_MAX_ROUTE_ENTRIES(port->sys_size), | |
434 | GFP_KERNEL); | |
5f28c520 YL |
435 | if (!rswitch->route_table) |
436 | goto cleanup; | |
eb188d0e | 437 | /* Initialize switch route table */ |
e0423236 ZW |
438 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); |
439 | rdid++) | |
eb188d0e | 440 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; |
b53c7583 | 441 | dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, |
6ca40c25 | 442 | rdev->comp_tag & RIO_CTAG_UDEVID); |
eb188d0e | 443 | |
2ec3ba69 AB |
444 | if (do_enum) |
445 | rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0); | |
933af4a6 TM |
446 | } else { |
447 | if (do_enum) | |
448 | /*Enable Input Output Port (transmitter reviever)*/ | |
449 | rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); | |
450 | ||
b53c7583 | 451 | dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, |
6ca40c25 | 452 | rdev->comp_tag & RIO_CTAG_UDEVID); |
933af4a6 | 453 | } |
eb188d0e | 454 | |
e6b585ca | 455 | rdev->dev.parent = &net->dev; |
a11650e1 | 456 | rio_attach_device(rdev); |
eb188d0e | 457 | rdev->dev.release = rio_release_dev; |
284901a9 | 458 | rdev->dma_mask = DMA_BIT_MASK(32); |
fa78cc51 | 459 | rdev->dev.dma_mask = &rdev->dma_mask; |
284901a9 | 460 | rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
eb188d0e | 461 | |
284fb68d | 462 | if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) |
eb188d0e MP |
463 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], |
464 | 0, 0xffff); | |
465 | ||
5f28c520 YL |
466 | ret = rio_add_device(rdev); |
467 | if (ret) | |
468 | goto cleanup; | |
eb188d0e | 469 | |
b74ec56e AB |
470 | rio_dev_get(rdev); |
471 | ||
eb188d0e | 472 | return rdev; |
5f28c520 YL |
473 | |
474 | cleanup: | |
166c050b | 475 | if (rswitch) |
5f28c520 | 476 | kfree(rswitch->route_table); |
ded05782 | 477 | |
5f28c520 YL |
478 | kfree(rdev); |
479 | return NULL; | |
eb188d0e MP |
480 | } |
481 | ||
482 | /** | |
483 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
484 | * @port: Master port to send transaction | |
485 | * @destid: Associated destination ID for switch | |
486 | * @hopcount: Hopcount to reach switch | |
487 | * @sport: Switch port number | |
488 | * | |
489 | * Reads the port error status CSR for a particular switch port to | |
490 | * determine if the port has an active link. Returns | |
e5cabeb3 | 491 | * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is |
eb188d0e MP |
492 | * inactive. |
493 | */ | |
494 | static int | |
495 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
496 | { | |
e5cabeb3 | 497 | u32 result = 0; |
eb188d0e MP |
498 | u32 ext_ftr_ptr; |
499 | ||
e5cabeb3 | 500 | ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0); |
eb188d0e | 501 | |
e5cabeb3 AB |
502 | while (ext_ftr_ptr) { |
503 | rio_mport_read_config_32(port, destid, hopcount, | |
504 | ext_ftr_ptr, &result); | |
505 | result = RIO_GET_BLOCK_ID(result); | |
506 | if ((result == RIO_EFB_SER_EP_FREE_ID) || | |
507 | (result == RIO_EFB_SER_EP_FREE_ID_V13P) || | |
508 | (result == RIO_EFB_SER_EP_FREC_ID)) | |
eb188d0e | 509 | break; |
e5cabeb3 AB |
510 | |
511 | ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, | |
512 | ext_ftr_ptr); | |
513 | } | |
eb188d0e MP |
514 | |
515 | if (ext_ftr_ptr) | |
516 | rio_mport_read_config_32(port, destid, hopcount, | |
517 | ext_ftr_ptr + | |
518 | RIO_PORT_N_ERR_STS_CSR(sport), | |
519 | &result); | |
520 | ||
e5cabeb3 | 521 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
522 | } |
523 | ||
eb188d0e MP |
524 | /** |
525 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
526 | * @port: Master port to send transaction | |
527 | * @hopcount: Number of hops to the device | |
528 | * | |
529 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
530 | * RIO device. Returns the value of the lock register. | |
531 | */ | |
532 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
533 | { | |
534 | u32 result; | |
535 | ||
e0423236 | 536 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, |
eb188d0e MP |
537 | RIO_HOST_DID_LOCK_CSR, &result); |
538 | ||
539 | return (u16) (result & 0xffff); | |
540 | } | |
541 | ||
eb188d0e MP |
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 | |
68fe4df5 AB |
547 | * @prev: Previous RIO device connected to the enumerated one |
548 | * @prev_port: Port on previous RIO device | |
eb188d0e MP |
549 | * |
550 | * Recursively enumerates a RIO network. Transactions are sent via the | |
551 | * master port passed in @port. | |
552 | */ | |
305c891e | 553 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, |
68fe4df5 | 554 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e | 555 | { |
eb188d0e | 556 | struct rio_dev *rdev; |
af84ca38 | 557 | u32 regval; |
eb188d0e MP |
558 | int tmp; |
559 | ||
e274e0ed AB |
560 | if (rio_mport_chk_dev_access(port, |
561 | RIO_ANY_DESTID(port->sys_size), hopcount)) { | |
562 | pr_debug("RIO: device access check failed\n"); | |
563 | return -1; | |
564 | } | |
565 | ||
eb188d0e MP |
566 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { |
567 | pr_debug("RIO: PE already discovered by this host\n"); | |
568 | /* | |
569 | * Already discovered by this host. Add it as another | |
af84ca38 | 570 | * link to the existing device. |
eb188d0e | 571 | */ |
af84ca38 AB |
572 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), |
573 | hopcount, RIO_COMPONENT_TAG_CSR, ®val); | |
574 | ||
575 | if (regval) { | |
576 | rdev = rio_get_comptag((regval & 0xffff), NULL); | |
577 | ||
578 | if (rdev && prev && rio_is_switch(prev)) { | |
579 | pr_debug("RIO: redundant path to %s\n", | |
580 | rio_name(rdev)); | |
581 | prev->rswitch->nextdev[prev_port] = rdev; | |
582 | } | |
583 | } | |
584 | ||
eb188d0e MP |
585 | return 0; |
586 | } | |
587 | ||
588 | /* Attempt to acquire device lock */ | |
e0423236 ZW |
589 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
590 | hopcount, | |
eb188d0e MP |
591 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); |
592 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
593 | < port->host_deviceid) { | |
594 | /* Delay a bit */ | |
595 | mdelay(1); | |
596 | /* Attempt to acquire device lock again */ | |
e0423236 ZW |
597 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
598 | hopcount, | |
eb188d0e MP |
599 | RIO_HOST_DID_LOCK_CSR, |
600 | port->host_deviceid); | |
601 | } | |
602 | ||
603 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
604 | pr_debug( | |
605 | "RIO: PE locked by a higher priority host...retreating\n"); | |
606 | return -1; | |
607 | } | |
608 | ||
609 | /* Setup new RIO device */ | |
e0423236 ZW |
610 | rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), |
611 | hopcount, 1); | |
612 | if (rdev) { | |
68fe4df5 AB |
613 | rdev->prev = prev; |
614 | if (prev && rio_is_switch(prev)) | |
615 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
616 | } else |
617 | return -1; | |
618 | ||
619 | if (rio_is_switch(rdev)) { | |
de74e00a AB |
620 | int sw_destid; |
621 | int cur_destid; | |
622 | int sw_inport; | |
623 | u16 destid; | |
624 | int port_num; | |
625 | ||
ae05cbd5 | 626 | sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); |
a93192a5 | 627 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
818a04a0 | 628 | port->host_deviceid, sw_inport, 0); |
c70555b0 | 629 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; |
eb188d0e | 630 | |
de74e00a AB |
631 | destid = rio_destid_first(net); |
632 | while (destid != RIO_INVALID_DESTID && destid < next_destid) { | |
633 | if (destid != port->host_deviceid) { | |
634 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, | |
635 | destid, sw_inport, 0); | |
636 | rdev->rswitch->route_table[destid] = sw_inport; | |
637 | } | |
638 | destid = rio_destid_next(net, destid + 1); | |
eb188d0e | 639 | } |
eb188d0e MP |
640 | pr_debug( |
641 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
642 | rio_name(rdev), rdev->vid, rdev->did, |
643 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
c70555b0 | 644 | sw_destid = next_destid; |
68fe4df5 AB |
645 | for (port_num = 0; |
646 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
647 | port_num++) { | |
8d4630dc AB |
648 | if (sw_inport == port_num) { |
649 | rio_enable_rx_tx_port(port, 0, | |
933af4a6 TM |
650 | RIO_ANY_DESTID(port->sys_size), |
651 | hopcount, port_num); | |
e5cabeb3 | 652 | rdev->rswitch->port_ok |= (1 << port_num); |
eb188d0e | 653 | continue; |
e5cabeb3 | 654 | } |
eb188d0e MP |
655 | |
656 | cur_destid = next_destid; | |
657 | ||
658 | if (rio_sport_is_active | |
e0423236 ZW |
659 | (port, RIO_ANY_DESTID(port->sys_size), hopcount, |
660 | port_num)) { | |
eb188d0e MP |
661 | pr_debug( |
662 | "RIO: scanning device on port %d\n", | |
663 | port_num); | |
8d4630dc AB |
664 | rio_enable_rx_tx_port(port, 0, |
665 | RIO_ANY_DESTID(port->sys_size), | |
666 | hopcount, port_num); | |
e5cabeb3 | 667 | rdev->rswitch->port_ok |= (1 << port_num); |
a93192a5 | 668 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
e0423236 | 669 | RIO_ANY_DESTID(port->sys_size), |
818a04a0 | 670 | port_num, 0); |
eb188d0e | 671 | |
68fe4df5 AB |
672 | if (rio_enum_peer(net, port, hopcount + 1, |
673 | rdev, port_num) < 0) | |
eb188d0e MP |
674 | return -1; |
675 | ||
676 | /* Update routing tables */ | |
de74e00a AB |
677 | destid = rio_destid_next(net, cur_destid + 1); |
678 | if (destid != RIO_INVALID_DESTID) { | |
eb188d0e | 679 | for (destid = cur_destid; |
de74e00a AB |
680 | destid < next_destid;) { |
681 | if (destid != port->host_deviceid) { | |
682 | rio_route_add_entry(rdev, | |
eb188d0e MP |
683 | RIO_GLOBAL_TABLE, |
684 | destid, | |
818a04a0 AB |
685 | port_num, |
686 | 0); | |
de74e00a AB |
687 | rdev->rswitch-> |
688 | route_table[destid] = | |
689 | port_num; | |
690 | } | |
691 | destid = rio_destid_next(net, | |
692 | destid + 1); | |
eb188d0e | 693 | } |
eb188d0e | 694 | } |
e5cabeb3 AB |
695 | } else { |
696 | /* If switch supports Error Management, | |
697 | * set PORT_LOCKOUT bit for unused port | |
698 | */ | |
699 | if (rdev->em_efptr) | |
700 | rio_set_port_lockout(rdev, port_num, 1); | |
701 | ||
702 | rdev->rswitch->port_ok &= ~(1 << port_num); | |
eb188d0e MP |
703 | } |
704 | } | |
c70555b0 | 705 | |
e5cabeb3 AB |
706 | /* Direct Port-write messages to the enumeratiing host */ |
707 | if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && | |
708 | (rdev->em_efptr)) { | |
709 | rio_write_config_32(rdev, | |
710 | rdev->em_efptr + RIO_EM_PW_TGT_DEVID, | |
711 | (port->host_deviceid << 16) | | |
712 | (port->sys_size << 15)); | |
713 | } | |
714 | ||
715 | rio_init_em(rdev); | |
716 | ||
c70555b0 | 717 | /* Check for empty switch */ |
de74e00a AB |
718 | if (next_destid == sw_destid) |
719 | next_destid = rio_destid_alloc(net); | |
c70555b0 | 720 | |
a93192a5 | 721 | rdev->destid = sw_destid; |
eb188d0e MP |
722 | } else |
723 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
724 | rio_name(rdev), rdev->vid, rdev->did); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | /** | |
730 | * rio_enum_complete- Tests if enumeration of a network is complete | |
731 | * @port: Master port to send transaction | |
732 | * | |
a571259f | 733 | * Tests the PGCCSR discovered bit for non-zero value (enumeration |
e5cabeb3 | 734 | * complete flag). Return %1 if enumeration is complete or %0 if |
eb188d0e MP |
735 | * enumeration is incomplete. |
736 | */ | |
737 | static int rio_enum_complete(struct rio_mport *port) | |
738 | { | |
af84ca38 | 739 | u32 regval; |
eb188d0e | 740 | |
af84ca38 AB |
741 | rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, |
742 | ®val); | |
a571259f | 743 | return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0; |
eb188d0e MP |
744 | } |
745 | ||
746 | /** | |
747 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
748 | * @net: RIO network being discovered | |
749 | * @port: Master port to send transactions | |
750 | * @destid: Current destination ID in network | |
751 | * @hopcount: Number of hops into the network | |
9b310acc RD |
752 | * @prev: previous rio_dev |
753 | * @prev_port: previous port number | |
eb188d0e MP |
754 | * |
755 | * Recursively discovers a RIO network. Transactions are sent via the | |
756 | * master port passed in @port. | |
757 | */ | |
305c891e | 758 | static int |
eb188d0e | 759 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, |
17e96205 | 760 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e MP |
761 | { |
762 | u8 port_num, route_port; | |
eb188d0e MP |
763 | struct rio_dev *rdev; |
764 | u16 ndestid; | |
765 | ||
766 | /* Setup new RIO device */ | |
767 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
17e96205 AB |
768 | rdev->prev = prev; |
769 | if (prev && rio_is_switch(prev)) | |
770 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
771 | } else |
772 | return -1; | |
773 | ||
774 | if (rio_is_switch(rdev)) { | |
eb188d0e | 775 | /* Associated destid is how we accessed this switch */ |
a93192a5 | 776 | rdev->destid = destid; |
eb188d0e | 777 | |
eb188d0e MP |
778 | pr_debug( |
779 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
780 | rio_name(rdev), rdev->vid, rdev->did, |
781 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
782 | for (port_num = 0; | |
783 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
784 | port_num++) { | |
ae05cbd5 | 785 | if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) |
eb188d0e MP |
786 | continue; |
787 | ||
788 | if (rio_sport_is_active | |
789 | (port, destid, hopcount, port_num)) { | |
790 | pr_debug( | |
791 | "RIO: scanning device on port %d\n", | |
792 | port_num); | |
818a04a0 AB |
793 | |
794 | rio_lock_device(port, destid, hopcount, 1000); | |
795 | ||
e0423236 ZW |
796 | for (ndestid = 0; |
797 | ndestid < RIO_ANY_DESTID(port->sys_size); | |
eb188d0e | 798 | ndestid++) { |
a93192a5 | 799 | rio_route_get_entry(rdev, |
eb188d0e MP |
800 | RIO_GLOBAL_TABLE, |
801 | ndestid, | |
818a04a0 | 802 | &route_port, 0); |
eb188d0e MP |
803 | if (route_port == port_num) |
804 | break; | |
805 | } | |
806 | ||
af84ca38 AB |
807 | if (ndestid == RIO_ANY_DESTID(port->sys_size)) |
808 | continue; | |
818a04a0 | 809 | rio_unlock_device(port, destid, hopcount); |
17e96205 AB |
810 | if (rio_disc_peer(net, port, ndestid, |
811 | hopcount + 1, rdev, port_num) < 0) | |
eb188d0e MP |
812 | return -1; |
813 | } | |
814 | } | |
815 | } else | |
816 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
817 | rio_name(rdev), rdev->vid, rdev->did); | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | /** | |
823 | * rio_mport_is_active- Tests if master port link is active | |
824 | * @port: Master port to test | |
825 | * | |
826 | * Reads the port error status CSR for the master port to | |
827 | * determine if the port has an active link. Returns | |
e5cabeb3 | 828 | * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active |
eb188d0e MP |
829 | * or %0 if it is inactive. |
830 | */ | |
831 | static int rio_mport_is_active(struct rio_mport *port) | |
832 | { | |
833 | u32 result = 0; | |
834 | u32 ext_ftr_ptr; | |
835 | int *entry = rio_mport_phys_table; | |
836 | ||
837 | do { | |
838 | if ((ext_ftr_ptr = | |
839 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
840 | break; | |
841 | } while (*++entry >= 0); | |
842 | ||
843 | if (ext_ftr_ptr) | |
844 | rio_local_read_config_32(port, | |
845 | ext_ftr_ptr + | |
846 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
847 | &result); | |
848 | ||
e5cabeb3 | 849 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
850 | } |
851 | ||
e6b585ca AB |
852 | static void rio_scan_release_net(struct rio_net *net) |
853 | { | |
854 | pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id); | |
855 | kfree(net->enum_data); | |
856 | } | |
857 | ||
858 | static void rio_scan_release_dev(struct device *dev) | |
859 | { | |
860 | struct rio_net *net; | |
861 | ||
862 | net = to_rio_net(dev); | |
863 | pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id); | |
864 | kfree(net); | |
865 | } | |
866 | ||
867 | /* | |
868 | * rio_scan_alloc_net - Allocate and configure a new RIO network | |
869 | * @mport: Master port associated with the RIO network | |
de74e00a AB |
870 | * @do_enum: Enumeration/Discovery mode flag |
871 | * @start: logical minimal start id for new net | |
eb188d0e | 872 | * |
e6b585ca AB |
873 | * Allocates a new RIO network structure and initializes enumerator-specific |
874 | * part of it (if required). | |
875 | * Returns a RIO network pointer on success or %NULL on failure. | |
eb188d0e | 876 | */ |
e6b585ca AB |
877 | static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport, |
878 | int do_enum, u16 start) | |
eb188d0e MP |
879 | { |
880 | struct rio_net *net; | |
881 | ||
e6b585ca AB |
882 | net = rio_alloc_net(mport); |
883 | ||
de74e00a | 884 | if (net && do_enum) { |
e6b585ca AB |
885 | struct rio_id_table *idtab; |
886 | size_t size; | |
887 | ||
888 | size = sizeof(struct rio_id_table) + | |
889 | BITS_TO_LONGS( | |
890 | RIO_MAX_ROUTE_ENTRIES(mport->sys_size) | |
891 | ) * sizeof(long); | |
de74e00a | 892 | |
e6b585ca AB |
893 | idtab = kzalloc(size, GFP_KERNEL); |
894 | ||
895 | if (idtab == NULL) { | |
de74e00a | 896 | pr_err("RIO: failed to allocate destID table\n"); |
e6b585ca | 897 | rio_free_net(net); |
de74e00a AB |
898 | net = NULL; |
899 | } else { | |
e6b585ca AB |
900 | net->enum_data = idtab; |
901 | net->release = rio_scan_release_net; | |
902 | idtab->start = start; | |
903 | idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size); | |
904 | spin_lock_init(&idtab->lock); | |
de74e00a AB |
905 | } |
906 | } | |
907 | ||
eb188d0e | 908 | if (net) { |
e6b585ca AB |
909 | net->id = mport->id; |
910 | net->hport = mport; | |
911 | dev_set_name(&net->dev, "rnet_%d", net->id); | |
912 | net->dev.parent = &mport->dev; | |
913 | net->dev.release = rio_scan_release_dev; | |
914 | rio_add_net(net); | |
eb188d0e | 915 | } |
e6b585ca | 916 | |
eb188d0e MP |
917 | return net; |
918 | } | |
919 | ||
c70555b0 AB |
920 | /** |
921 | * rio_update_route_tables- Updates route tables in switches | |
a7071efc | 922 | * @net: RIO network to run update on |
c70555b0 AB |
923 | * |
924 | * For each enumerated device, ensure that each switch in a system | |
925 | * has correct routing entries. Add routes for devices that where | |
926 | * unknown dirung the first enumeration pass through the switch. | |
927 | */ | |
a7071efc | 928 | static void rio_update_route_tables(struct rio_net *net) |
c70555b0 | 929 | { |
ded05782 | 930 | struct rio_dev *rdev, *swrdev; |
c70555b0 AB |
931 | struct rio_switch *rswitch; |
932 | u8 sport; | |
933 | u16 destid; | |
934 | ||
a7071efc | 935 | list_for_each_entry(rdev, &net->devices, net_list) { |
c70555b0 | 936 | |
a93192a5 | 937 | destid = rdev->destid; |
c70555b0 | 938 | |
a7071efc | 939 | list_for_each_entry(rswitch, &net->switches, node) { |
c70555b0 AB |
940 | |
941 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
942 | continue; | |
943 | ||
944 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
ded05782 AB |
945 | swrdev = sw_to_rio_dev(rswitch); |
946 | ||
07590ff0 | 947 | /* Skip if destid ends in empty switch*/ |
ded05782 | 948 | if (swrdev->destid == destid) |
07590ff0 | 949 | continue; |
c70555b0 | 950 | |
ded05782 | 951 | sport = RIO_GET_PORT_NUM(swrdev->swpinfo); |
c70555b0 | 952 | |
2ec3ba69 AB |
953 | rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE, |
954 | destid, sport, 0); | |
955 | rswitch->route_table[destid] = sport; | |
c70555b0 AB |
956 | } |
957 | } | |
958 | } | |
959 | } | |
960 | ||
e5cabeb3 AB |
961 | /** |
962 | * rio_init_em - Initializes RIO Error Management (for switches) | |
97ef6f74 | 963 | * @rdev: RIO device |
e5cabeb3 AB |
964 | * |
965 | * For each enumerated switch, call device-specific error management | |
966 | * initialization routine (if supplied by the switch driver). | |
967 | */ | |
968 | static void rio_init_em(struct rio_dev *rdev) | |
969 | { | |
970 | if (rio_is_switch(rdev) && (rdev->em_efptr) && | |
2ec3ba69 AB |
971 | rdev->rswitch->ops && rdev->rswitch->ops->em_init) { |
972 | rdev->rswitch->ops->em_init(rdev); | |
e5cabeb3 AB |
973 | } |
974 | } | |
975 | ||
eb188d0e MP |
976 | /** |
977 | * rio_enum_mport- Start enumeration through a master port | |
978 | * @mport: Master port to send transactions | |
bc8fcfea | 979 | * @flags: Enumeration control flags |
eb188d0e MP |
980 | * |
981 | * Starts the enumeration process. If somebody has enumerated our | |
982 | * master port device, then give up. If not and we have an active | |
983 | * link, then start recursive peer enumeration. Returns %0 if | |
984 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
985 | */ | |
36f0efbb | 986 | static int rio_enum_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
987 | { |
988 | struct rio_net *net = NULL; | |
989 | int rc = 0; | |
990 | ||
991 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
992 | mport->name); | |
bc8fcfea AB |
993 | |
994 | /* | |
995 | * To avoid multiple start requests (repeat enumeration is not supported | |
996 | * by this method) check if enumeration/discovery was performed for this | |
997 | * mport: if mport was added into the list of mports for a net exit | |
998 | * with error. | |
999 | */ | |
1000 | if (mport->nnode.next || mport->nnode.prev) | |
1001 | return -EBUSY; | |
1002 | ||
eb188d0e MP |
1003 | /* If somebody else enumerated our master port device, bail. */ |
1004 | if (rio_enum_host(mport) < 0) { | |
1005 | printk(KERN_INFO | |
1006 | "RIO: master port %d device has been enumerated by a remote host\n", | |
1007 | mport->id); | |
1008 | rc = -EBUSY; | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | /* If master port has an active link, allocate net and enum peers */ | |
1013 | if (rio_mport_is_active(mport)) { | |
e6b585ca | 1014 | net = rio_scan_alloc_net(mport, 1, 0); |
de74e00a | 1015 | if (!net) { |
eb188d0e MP |
1016 | printk(KERN_ERR "RIO: failed to allocate new net\n"); |
1017 | rc = -ENOMEM; | |
1018 | goto out; | |
1019 | } | |
933af4a6 | 1020 | |
de74e00a AB |
1021 | /* reserve mport destID in new net */ |
1022 | rio_destid_reserve(net, mport->host_deviceid); | |
1023 | ||
933af4a6 TM |
1024 | /* Enable Input Output Port (transmitter reviever) */ |
1025 | rio_enable_rx_tx_port(mport, 1, 0, 0, 0); | |
1026 | ||
af84ca38 AB |
1027 | /* Set component tag for host */ |
1028 | rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, | |
1029 | next_comptag++); | |
1030 | ||
de74e00a AB |
1031 | next_destid = rio_destid_alloc(net); |
1032 | ||
68fe4df5 | 1033 | if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { |
eb188d0e MP |
1034 | /* A higher priority host won enumeration, bail. */ |
1035 | printk(KERN_INFO | |
1036 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
1037 | mport->id); | |
a7071efc | 1038 | rio_clear_locks(net); |
eb188d0e MP |
1039 | rc = -EBUSY; |
1040 | goto out; | |
1041 | } | |
de74e00a AB |
1042 | /* free the last allocated destID (unused) */ |
1043 | rio_destid_free(net, next_destid); | |
a7071efc AB |
1044 | rio_update_route_tables(net); |
1045 | rio_clear_locks(net); | |
e5cabeb3 | 1046 | rio_pw_enable(mport, 1); |
eb188d0e MP |
1047 | } else { |
1048 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
1049 | mport->id); | |
1050 | rc = -EINVAL; | |
1051 | } | |
1052 | ||
1053 | out: | |
1054 | return rc; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * rio_build_route_tables- Generate route tables from switch route entries | |
a7071efc | 1059 | * @net: RIO network to run route tables scan on |
eb188d0e MP |
1060 | * |
1061 | * For each switch device, generate a route table by copying existing | |
1062 | * route entries from the switch. | |
1063 | */ | |
a7071efc | 1064 | static void rio_build_route_tables(struct rio_net *net) |
eb188d0e | 1065 | { |
a7071efc | 1066 | struct rio_switch *rswitch; |
eb188d0e MP |
1067 | struct rio_dev *rdev; |
1068 | int i; | |
1069 | u8 sport; | |
1070 | ||
a7071efc AB |
1071 | list_for_each_entry(rswitch, &net->switches, node) { |
1072 | rdev = sw_to_rio_dev(rswitch); | |
818a04a0 | 1073 | |
a7071efc AB |
1074 | rio_lock_device(net->hport, rdev->destid, |
1075 | rdev->hopcount, 1000); | |
1076 | for (i = 0; | |
1077 | i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size); | |
1078 | i++) { | |
1079 | if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE, | |
1080 | i, &sport, 0) < 0) | |
1081 | continue; | |
1082 | rswitch->route_table[i] = sport; | |
eb188d0e | 1083 | } |
a7071efc AB |
1084 | |
1085 | rio_unlock_device(net->hport, rdev->destid, rdev->hopcount); | |
1086 | } | |
eb188d0e MP |
1087 | } |
1088 | ||
eb188d0e MP |
1089 | /** |
1090 | * rio_disc_mport- Start discovery through a master port | |
1091 | * @mport: Master port to send transactions | |
bc8fcfea | 1092 | * @flags: discovery control flags |
eb188d0e MP |
1093 | * |
1094 | * Starts the discovery process. If we have an active link, | |
bc8fcfea AB |
1095 | * then wait for the signal that enumeration is complete (if wait |
1096 | * is allowed). | |
eb188d0e MP |
1097 | * When enumeration completion is signaled, start recursive |
1098 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
1099 | * on failure. | |
1100 | */ | |
36f0efbb | 1101 | static int rio_disc_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
1102 | { |
1103 | struct rio_net *net = NULL; | |
fa3dbaa0 | 1104 | unsigned long to_end; |
eb188d0e MP |
1105 | |
1106 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
1107 | mport->name); | |
1108 | ||
1109 | /* If master port has an active link, allocate net and discover peers */ | |
1110 | if (rio_mport_is_active(mport)) { | |
bc8fcfea AB |
1111 | if (rio_enum_complete(mport)) |
1112 | goto enum_done; | |
1113 | else if (flags & RIO_SCAN_ENUM_NO_WAIT) | |
1114 | return -EAGAIN; | |
1115 | ||
fa3dbaa0 | 1116 | pr_debug("RIO: wait for enumeration to complete...\n"); |
eb188d0e | 1117 | |
fa3dbaa0 AB |
1118 | to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; |
1119 | while (time_before(jiffies, to_end)) { | |
1120 | if (rio_enum_complete(mport)) | |
1121 | goto enum_done; | |
f4c9c0e8 | 1122 | msleep(10); |
eb188d0e | 1123 | } |
eb188d0e | 1124 | |
fa3dbaa0 AB |
1125 | pr_debug("RIO: discovery timeout on mport %d %s\n", |
1126 | mport->id, mport->name); | |
1127 | goto bail; | |
1128 | enum_done: | |
1129 | pr_debug("RIO: ... enumeration done\n"); | |
1130 | ||
e6b585ca | 1131 | net = rio_scan_alloc_net(mport, 0, 0); |
fa3dbaa0 AB |
1132 | if (!net) { |
1133 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
1134 | goto bail; | |
1135 | } | |
818a04a0 AB |
1136 | |
1137 | /* Read DestID assigned by enumerator */ | |
1138 | rio_local_read_config_32(mport, RIO_DID_CSR, | |
1139 | &mport->host_deviceid); | |
1140 | mport->host_deviceid = RIO_GET_DID(mport->sys_size, | |
1141 | mport->host_deviceid); | |
1142 | ||
e0423236 | 1143 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), |
17e96205 | 1144 | 0, NULL, 0) < 0) { |
eb188d0e MP |
1145 | printk(KERN_INFO |
1146 | "RIO: master port %d device has failed discovery\n", | |
1147 | mport->id); | |
1148 | goto bail; | |
1149 | } | |
1150 | ||
a7071efc | 1151 | rio_build_route_tables(net); |
eb188d0e MP |
1152 | } |
1153 | ||
1154 | return 0; | |
fa3dbaa0 | 1155 | bail: |
eb188d0e MP |
1156 | return -EBUSY; |
1157 | } | |
a11650e1 AB |
1158 | |
1159 | static struct rio_scan rio_scan_ops = { | |
9edbc30b | 1160 | .owner = THIS_MODULE, |
a11650e1 AB |
1161 | .enumerate = rio_enum_mport, |
1162 | .discover = rio_disc_mport, | |
1163 | }; | |
1164 | ||
1165 | static bool scan; | |
1166 | module_param(scan, bool, 0); | |
1167 | MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery " | |
1168 | "(default = 0)"); | |
1169 | ||
1170 | /** | |
1171 | * rio_basic_attach: | |
1172 | * | |
1173 | * When this enumeration/discovery method is loaded as a module this function | |
1174 | * registers its specific enumeration and discover routines for all available | |
1175 | * RapidIO mport devices. The "scan" command line parameter controls ability of | |
1176 | * the module to start RapidIO enumeration/discovery automatically. | |
1177 | * | |
1178 | * Returns 0 for success or -EIO if unable to register itself. | |
1179 | * | |
1180 | * This enumeration/discovery method cannot be unloaded and therefore does not | |
1181 | * provide a matching cleanup_module routine. | |
1182 | */ | |
1183 | ||
1184 | static int __init rio_basic_attach(void) | |
1185 | { | |
1186 | if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops)) | |
1187 | return -EIO; | |
1188 | if (scan) | |
1189 | rio_init_mports(); | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | late_initcall(rio_basic_attach); | |
1194 | ||
1195 | MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery"); | |
1196 | MODULE_LICENSE("GPL"); |