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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
eb188d0e MP |
2 | /* |
3 | * RapidIO enumeration and discovery support | |
4 | * | |
5 | * Copyright 2005 MontaVista Software, Inc. | |
6 | * Matt Porter <mporter@kernel.crashing.org> | |
7 | * | |
e5cabeb3 AB |
8 | * Copyright 2009 Integrated Device Technology, Inc. |
9 | * Alex Bounine <alexandre.bounine@idt.com> | |
10 | * - Added Port-Write/Error Management initialization and handling | |
11 | * | |
933af4a6 TM |
12 | * Copyright 2009 Sysgo AG |
13 | * Thomas Moll <thomas.moll@sysgo.com> | |
14 | * - Added Input- Output- enable functionality, to allow full communication | |
eb188d0e MP |
15 | */ |
16 | ||
eb188d0e MP |
17 | #include <linux/types.h> |
18 | #include <linux/kernel.h> | |
19 | ||
20 | #include <linux/delay.h> | |
fa78cc51 | 21 | #include <linux/dma-mapping.h> |
eb188d0e MP |
22 | #include <linux/init.h> |
23 | #include <linux/rio.h> | |
24 | #include <linux/rio_drv.h> | |
25 | #include <linux/rio_ids.h> | |
26 | #include <linux/rio_regs.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/timer.h> | |
fa3dbaa0 | 30 | #include <linux/sched.h> |
de25968c TS |
31 | #include <linux/jiffies.h> |
32 | #include <linux/slab.h> | |
eb188d0e MP |
33 | |
34 | #include "rio.h" | |
35 | ||
e5cabeb3 AB |
36 | static void rio_init_em(struct rio_dev *rdev); |
37 | ||
e6b585ca AB |
38 | struct rio_id_table { |
39 | u16 start; /* logical minimal id */ | |
40 | u32 max; /* max number of IDs in table */ | |
41 | spinlock_t lock; | |
42 | unsigned long table[0]; | |
43 | }; | |
44 | ||
eb188d0e | 45 | static int next_destid = 0; |
af84ca38 | 46 | static int next_comptag = 1; |
eb188d0e | 47 | |
4ed134be | 48 | /** |
de74e00a | 49 | * rio_destid_alloc - Allocate next available destID for given network |
4ed134be | 50 | * @net: RIO network |
de74e00a AB |
51 | * |
52 | * Returns next available device destination ID for the specified RIO network. | |
53 | * Marks allocated ID as one in use. | |
54 | * Returns RIO_INVALID_DESTID if new destID is not available. | |
55 | */ | |
56 | static u16 rio_destid_alloc(struct rio_net *net) | |
57 | { | |
58 | int destid; | |
e6b585ca | 59 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
60 | |
61 | spin_lock(&idtab->lock); | |
4ed134be | 62 | destid = find_first_zero_bit(idtab->table, idtab->max); |
de74e00a AB |
63 | |
64 | if (destid < idtab->max) { | |
de74e00a AB |
65 | set_bit(destid, idtab->table); |
66 | destid += idtab->start; | |
67 | } else | |
68 | destid = RIO_INVALID_DESTID; | |
69 | ||
70 | spin_unlock(&idtab->lock); | |
71 | return (u16)destid; | |
72 | } | |
73 | ||
4ed134be | 74 | /** |
b94bb1f6 | 75 | * rio_destid_reserve - Reserve the specified destID |
4ed134be AB |
76 | * @net: RIO network |
77 | * @destid: destID to reserve | |
de74e00a AB |
78 | * |
79 | * Tries to reserve the specified destID. | |
76679286 | 80 | * Returns 0 if successful. |
de74e00a AB |
81 | */ |
82 | static int rio_destid_reserve(struct rio_net *net, u16 destid) | |
83 | { | |
84 | int oldbit; | |
e6b585ca | 85 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
86 | |
87 | destid -= idtab->start; | |
88 | spin_lock(&idtab->lock); | |
89 | oldbit = test_and_set_bit(destid, idtab->table); | |
90 | spin_unlock(&idtab->lock); | |
91 | return oldbit; | |
92 | } | |
93 | ||
4ed134be | 94 | /** |
de74e00a | 95 | * rio_destid_free - free a previously allocated destID |
4ed134be AB |
96 | * @net: RIO network |
97 | * @destid: destID to free | |
de74e00a AB |
98 | * |
99 | * Makes the specified destID available for use. | |
100 | */ | |
101 | static void rio_destid_free(struct rio_net *net, u16 destid) | |
102 | { | |
e6b585ca | 103 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
104 | |
105 | destid -= idtab->start; | |
106 | spin_lock(&idtab->lock); | |
107 | clear_bit(destid, idtab->table); | |
108 | spin_unlock(&idtab->lock); | |
109 | } | |
110 | ||
4ed134be | 111 | /** |
de74e00a | 112 | * rio_destid_first - return first destID in use |
4ed134be | 113 | * @net: RIO network |
de74e00a AB |
114 | */ |
115 | static u16 rio_destid_first(struct rio_net *net) | |
116 | { | |
117 | int destid; | |
e6b585ca | 118 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
119 | |
120 | spin_lock(&idtab->lock); | |
121 | destid = find_first_bit(idtab->table, idtab->max); | |
122 | if (destid >= idtab->max) | |
123 | destid = RIO_INVALID_DESTID; | |
124 | else | |
125 | destid += idtab->start; | |
126 | spin_unlock(&idtab->lock); | |
127 | return (u16)destid; | |
128 | } | |
129 | ||
4ed134be | 130 | /** |
de74e00a | 131 | * rio_destid_next - return next destID in use |
4ed134be AB |
132 | * @net: RIO network |
133 | * @from: destination ID from which search shall continue | |
de74e00a AB |
134 | */ |
135 | static u16 rio_destid_next(struct rio_net *net, u16 from) | |
136 | { | |
137 | int destid; | |
e6b585ca | 138 | struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data; |
de74e00a AB |
139 | |
140 | spin_lock(&idtab->lock); | |
141 | destid = find_next_bit(idtab->table, idtab->max, from); | |
142 | if (destid >= idtab->max) | |
143 | destid = RIO_INVALID_DESTID; | |
144 | else | |
145 | destid += idtab->start; | |
146 | spin_unlock(&idtab->lock); | |
147 | return (u16)destid; | |
148 | } | |
149 | ||
eb188d0e MP |
150 | /** |
151 | * rio_get_device_id - Get the base/extended device id for a device | |
152 | * @port: RIO master port | |
153 | * @destid: Destination ID of device | |
154 | * @hopcount: Hopcount to device | |
155 | * | |
156 | * Reads the base/extended device id from a device. Returns the | |
157 | * 8/16-bit device ID. | |
158 | */ | |
159 | static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) | |
160 | { | |
161 | u32 result; | |
162 | ||
163 | rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); | |
164 | ||
e0423236 | 165 | return RIO_GET_DID(port->sys_size, result); |
eb188d0e MP |
166 | } |
167 | ||
168 | /** | |
169 | * rio_set_device_id - Set the base/extended device id for a device | |
170 | * @port: RIO master port | |
171 | * @destid: Destination ID of device | |
172 | * @hopcount: Hopcount to device | |
173 | * @did: Device ID value to be written | |
174 | * | |
175 | * Writes the base/extended device id from a device. | |
176 | */ | |
fa78cc51 | 177 | static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) |
eb188d0e MP |
178 | { |
179 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
e0423236 | 180 | RIO_SET_DID(port->sys_size, did)); |
eb188d0e MP |
181 | } |
182 | ||
eb188d0e MP |
183 | /** |
184 | * rio_clear_locks- Release all host locks and signal enumeration complete | |
a7071efc | 185 | * @net: RIO network to run on |
eb188d0e MP |
186 | * |
187 | * Marks the component tag CSR on each device with the enumeration | |
188 | * complete flag. When complete, it then release the host locks on | |
189 | * each device. Returns 0 on success or %-EINVAL on failure. | |
190 | */ | |
a7071efc | 191 | static int rio_clear_locks(struct rio_net *net) |
eb188d0e | 192 | { |
a7071efc | 193 | struct rio_mport *port = net->hport; |
eb188d0e MP |
194 | struct rio_dev *rdev; |
195 | u32 result; | |
196 | int ret = 0; | |
197 | ||
eb188d0e MP |
198 | /* Release host device id locks */ |
199 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
200 | port->host_deviceid); | |
201 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
202 | if ((result & 0xffff) != 0xffff) { | |
203 | printk(KERN_INFO | |
204 | "RIO: badness when releasing host lock on master port, result %8.8x\n", | |
205 | result); | |
206 | ret = -EINVAL; | |
207 | } | |
a7071efc | 208 | list_for_each_entry(rdev, &net->devices, net_list) { |
eb188d0e MP |
209 | rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, |
210 | port->host_deviceid); | |
211 | rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); | |
212 | if ((result & 0xffff) != 0xffff) { | |
213 | printk(KERN_INFO | |
214 | "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", | |
215 | rdev->vid, rdev->did); | |
216 | ret = -EINVAL; | |
217 | } | |
af84ca38 AB |
218 | |
219 | /* Mark device as discovered and enable master */ | |
220 | rio_read_config_32(rdev, | |
221 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
222 | &result); | |
223 | result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; | |
224 | rio_write_config_32(rdev, | |
225 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
226 | result); | |
eb188d0e MP |
227 | } |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | /** | |
233 | * rio_enum_host- Set host lock and initialize host destination ID | |
234 | * @port: Master port to issue transaction | |
235 | * | |
236 | * Sets the local host master port lock and destination ID register | |
237 | * with the host device ID value. The host device ID value is provided | |
238 | * by the platform. Returns %0 on success or %-1 on failure. | |
239 | */ | |
240 | static int rio_enum_host(struct rio_mport *port) | |
241 | { | |
242 | u32 result; | |
243 | ||
244 | /* Set master port host device id lock */ | |
245 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
246 | port->host_deviceid); | |
247 | ||
248 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
249 | if ((result & 0xffff) != port->host_deviceid) | |
250 | return -1; | |
251 | ||
252 | /* Set master port destid and init destid ctr */ | |
253 | rio_local_set_device_id(port, port->host_deviceid); | |
eb188d0e MP |
254 | return 0; |
255 | } | |
256 | ||
257 | /** | |
258 | * rio_device_has_destid- Test if a device contains a destination ID register | |
259 | * @port: Master port to issue transaction | |
260 | * @src_ops: RIO device source operations | |
261 | * @dst_ops: RIO device destination operations | |
262 | * | |
263 | * Checks the provided @src_ops and @dst_ops for the necessary transaction | |
264 | * capabilities that indicate whether or not a device will implement a | |
265 | * destination ID register. Returns 1 if true or 0 if false. | |
266 | */ | |
267 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
268 | int dst_ops) | |
269 | { | |
fa78cc51 MP |
270 | 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; |
271 | ||
272 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
273 | } |
274 | ||
275 | /** | |
276 | * rio_release_dev- Frees a RIO device struct | |
277 | * @dev: LDM device associated with a RIO device struct | |
278 | * | |
279 | * Gets the RIO device struct associated a RIO device struct. | |
280 | * The RIO device struct is freed. | |
281 | */ | |
282 | static void rio_release_dev(struct device *dev) | |
283 | { | |
284 | struct rio_dev *rdev; | |
285 | ||
286 | rdev = to_rio_dev(dev); | |
287 | kfree(rdev); | |
288 | } | |
289 | ||
290 | /** | |
291 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
292 | * @rdev: RIO device | |
293 | * | |
294 | * Gets the RIO device Processing Element Features register | |
295 | * contents and tests for switch capabilities. Returns 1 if | |
296 | * the device is a switch or 0 if it is not a switch. | |
297 | * The RIO device struct is freed. | |
298 | */ | |
299 | static int rio_is_switch(struct rio_dev *rdev) | |
300 | { | |
301 | if (rdev->pef & RIO_PEF_SWITCH) | |
302 | return 1; | |
303 | return 0; | |
304 | } | |
305 | ||
eb188d0e MP |
306 | /** |
307 | * rio_setup_device- Allocates and sets up a RIO device | |
308 | * @net: RIO network | |
309 | * @port: Master port to send transactions | |
310 | * @destid: Current destination ID | |
311 | * @hopcount: Current hopcount | |
312 | * @do_enum: Enumeration/Discovery mode flag | |
313 | * | |
314 | * Allocates a RIO device and configures fields based on configuration | |
315 | * space contents. If device has a destination ID register, a destination | |
316 | * ID is either assigned in enumeration mode or read from configuration | |
317 | * space in discovery mode. If the device has switch capabilities, then | |
318 | * a switch is allocated and configured appropriately. Returns a pointer | |
319 | * to a RIO device on success or NULL on failure. | |
320 | * | |
321 | */ | |
305c891e | 322 | static struct rio_dev *rio_setup_device(struct rio_net *net, |
eb188d0e MP |
323 | struct rio_mport *port, u16 destid, |
324 | u8 hopcount, int do_enum) | |
325 | { | |
5f28c520 | 326 | int ret = 0; |
eb188d0e | 327 | struct rio_dev *rdev; |
5f28c520 | 328 | struct rio_switch *rswitch = NULL; |
eb188d0e | 329 | int result, rdid; |
ded05782 AB |
330 | size_t size; |
331 | u32 swpinfo = 0; | |
eb188d0e | 332 | |
ded05782 AB |
333 | size = sizeof(struct rio_dev); |
334 | if (rio_mport_read_config_32(port, destid, hopcount, | |
335 | RIO_PEF_CAR, &result)) | |
336 | return NULL; | |
337 | ||
338 | if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) { | |
339 | rio_mport_read_config_32(port, destid, hopcount, | |
340 | RIO_SWP_INFO_CAR, &swpinfo); | |
341 | if (result & RIO_PEF_SWITCH) { | |
342 | size += (RIO_GET_TOTAL_PORTS(swpinfo) * | |
343 | sizeof(rswitch->nextdev[0])) + sizeof(*rswitch); | |
344 | } | |
345 | } | |
346 | ||
347 | rdev = kzalloc(size, GFP_KERNEL); | |
eb188d0e | 348 | if (!rdev) |
5f28c520 | 349 | return NULL; |
eb188d0e | 350 | |
eb188d0e | 351 | rdev->net = net; |
ded05782 AB |
352 | rdev->pef = result; |
353 | rdev->swpinfo = swpinfo; | |
eb188d0e MP |
354 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, |
355 | &result); | |
356 | rdev->did = result >> 16; | |
357 | rdev->vid = result & 0xffff; | |
358 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, | |
359 | &rdev->device_rev); | |
360 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, | |
361 | &result); | |
362 | rdev->asm_did = result >> 16; | |
363 | rdev->asm_vid = result & 0xffff; | |
364 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, | |
365 | &result); | |
366 | rdev->asm_rev = result >> 16; | |
e5cabeb3 | 367 | if (rdev->pef & RIO_PEF_EXT_FEATURES) { |
eb188d0e | 368 | rdev->efptr = result & 0xffff; |
e5cabeb3 | 369 | rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid, |
1ae842de AB |
370 | hopcount, &rdev->phys_rmap); |
371 | pr_debug("RIO: %s Register Map %d device\n", | |
372 | __func__, rdev->phys_rmap); | |
e5cabeb3 AB |
373 | |
374 | rdev->em_efptr = rio_mport_get_feature(port, 0, destid, | |
375 | hopcount, RIO_EFB_ERR_MGMNT); | |
1ae842de AB |
376 | if (!rdev->em_efptr) |
377 | rdev->em_efptr = rio_mport_get_feature(port, 0, destid, | |
378 | hopcount, RIO_EFB_ERR_MGMNT_HS); | |
e5cabeb3 | 379 | } |
eb188d0e MP |
380 | |
381 | rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, | |
382 | &rdev->src_ops); | |
383 | rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, | |
384 | &rdev->dst_ops); | |
385 | ||
af84ca38 AB |
386 | if (do_enum) { |
387 | /* Assign component tag to device */ | |
388 | if (next_comptag >= 0x10000) { | |
389 | pr_err("RIO: Component Tag Counter Overflow\n"); | |
390 | goto cleanup; | |
391 | } | |
392 | rio_mport_write_config_32(port, destid, hopcount, | |
393 | RIO_COMPONENT_TAG_CSR, next_comptag); | |
394 | rdev->comp_tag = next_comptag++; | |
2ec3ba69 | 395 | rdev->do_enum = true; |
558bda65 AB |
396 | } else { |
397 | rio_mport_read_config_32(port, destid, hopcount, | |
398 | RIO_COMPONENT_TAG_CSR, | |
399 | &rdev->comp_tag); | |
af84ca38 AB |
400 | } |
401 | ||
c70555b0 AB |
402 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
403 | if (do_enum) { | |
404 | rio_set_device_id(port, destid, hopcount, next_destid); | |
de74e00a AB |
405 | rdev->destid = next_destid; |
406 | next_destid = rio_destid_alloc(net); | |
c70555b0 AB |
407 | } else |
408 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
a93192a5 AB |
409 | |
410 | rdev->hopcount = 0xff; | |
411 | } else { | |
412 | /* Switch device has an associated destID which | |
413 | * will be adjusted later | |
414 | */ | |
415 | rdev->destid = destid; | |
416 | rdev->hopcount = hopcount; | |
417 | } | |
eb188d0e MP |
418 | |
419 | /* If a PE has both switch and other functions, show it as a switch */ | |
420 | if (rio_is_switch(rdev)) { | |
ded05782 | 421 | rswitch = rdev->rswitch; |
e5cabeb3 | 422 | rswitch->port_ok = 0; |
2ec3ba69 | 423 | spin_lock_init(&rswitch->lock); |
6396bb22 KC |
424 | rswitch->route_table = |
425 | kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size), | |
426 | GFP_KERNEL); | |
5f28c520 LY |
427 | if (!rswitch->route_table) |
428 | goto cleanup; | |
eb188d0e | 429 | /* Initialize switch route table */ |
e0423236 ZW |
430 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); |
431 | rdid++) | |
eb188d0e | 432 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; |
b53c7583 | 433 | dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, |
6ca40c25 | 434 | rdev->comp_tag & RIO_CTAG_UDEVID); |
eb188d0e | 435 | |
2ec3ba69 AB |
436 | if (do_enum) |
437 | rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0); | |
933af4a6 TM |
438 | } else { |
439 | if (do_enum) | |
1ae842de | 440 | /*Enable Input Output Port (transmitter receiver)*/ |
933af4a6 TM |
441 | rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); |
442 | ||
b53c7583 | 443 | dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, |
6ca40c25 | 444 | rdev->comp_tag & RIO_CTAG_UDEVID); |
933af4a6 | 445 | } |
eb188d0e | 446 | |
e6b585ca | 447 | rdev->dev.parent = &net->dev; |
a11650e1 | 448 | rio_attach_device(rdev); |
eb188d0e | 449 | rdev->dev.release = rio_release_dev; |
284901a9 | 450 | rdev->dma_mask = DMA_BIT_MASK(32); |
fa78cc51 | 451 | rdev->dev.dma_mask = &rdev->dma_mask; |
284901a9 | 452 | rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
eb188d0e | 453 | |
284fb68d | 454 | if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) |
eb188d0e MP |
455 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], |
456 | 0, 0xffff); | |
457 | ||
5f28c520 LY |
458 | ret = rio_add_device(rdev); |
459 | if (ret) | |
460 | goto cleanup; | |
eb188d0e | 461 | |
b74ec56e AB |
462 | rio_dev_get(rdev); |
463 | ||
eb188d0e | 464 | return rdev; |
5f28c520 LY |
465 | |
466 | cleanup: | |
166c050b | 467 | if (rswitch) |
5f28c520 | 468 | kfree(rswitch->route_table); |
ded05782 | 469 | |
5f28c520 LY |
470 | kfree(rdev); |
471 | return NULL; | |
eb188d0e MP |
472 | } |
473 | ||
474 | /** | |
475 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
1ae842de AB |
476 | * @rdev: RapidIO device object |
477 | * @sp: Switch port number | |
eb188d0e MP |
478 | * |
479 | * Reads the port error status CSR for a particular switch port to | |
480 | * determine if the port has an active link. Returns | |
e5cabeb3 | 481 | * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is |
eb188d0e MP |
482 | * inactive. |
483 | */ | |
484 | static int | |
1ae842de | 485 | rio_sport_is_active(struct rio_dev *rdev, int sp) |
eb188d0e | 486 | { |
e5cabeb3 | 487 | u32 result = 0; |
eb188d0e | 488 | |
1ae842de AB |
489 | rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp), |
490 | &result); | |
eb188d0e | 491 | |
e5cabeb3 | 492 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
493 | } |
494 | ||
eb188d0e MP |
495 | /** |
496 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
497 | * @port: Master port to send transaction | |
498 | * @hopcount: Number of hops to the device | |
499 | * | |
500 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
501 | * RIO device. Returns the value of the lock register. | |
502 | */ | |
503 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
504 | { | |
505 | u32 result; | |
506 | ||
e0423236 | 507 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, |
eb188d0e MP |
508 | RIO_HOST_DID_LOCK_CSR, &result); |
509 | ||
510 | return (u16) (result & 0xffff); | |
511 | } | |
512 | ||
eb188d0e MP |
513 | /** |
514 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
515 | * @net: RIO network being enumerated | |
516 | * @port: Master port to send transactions | |
517 | * @hopcount: Number of hops into the network | |
68fe4df5 AB |
518 | * @prev: Previous RIO device connected to the enumerated one |
519 | * @prev_port: Port on previous RIO device | |
eb188d0e MP |
520 | * |
521 | * Recursively enumerates a RIO network. Transactions are sent via the | |
522 | * master port passed in @port. | |
523 | */ | |
305c891e | 524 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, |
68fe4df5 | 525 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e | 526 | { |
eb188d0e | 527 | struct rio_dev *rdev; |
af84ca38 | 528 | u32 regval; |
eb188d0e MP |
529 | int tmp; |
530 | ||
e274e0ed AB |
531 | if (rio_mport_chk_dev_access(port, |
532 | RIO_ANY_DESTID(port->sys_size), hopcount)) { | |
533 | pr_debug("RIO: device access check failed\n"); | |
534 | return -1; | |
535 | } | |
536 | ||
eb188d0e MP |
537 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { |
538 | pr_debug("RIO: PE already discovered by this host\n"); | |
539 | /* | |
540 | * Already discovered by this host. Add it as another | |
af84ca38 | 541 | * link to the existing device. |
eb188d0e | 542 | */ |
af84ca38 AB |
543 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), |
544 | hopcount, RIO_COMPONENT_TAG_CSR, ®val); | |
545 | ||
546 | if (regval) { | |
547 | rdev = rio_get_comptag((regval & 0xffff), NULL); | |
548 | ||
549 | if (rdev && prev && rio_is_switch(prev)) { | |
550 | pr_debug("RIO: redundant path to %s\n", | |
551 | rio_name(rdev)); | |
552 | prev->rswitch->nextdev[prev_port] = rdev; | |
553 | } | |
554 | } | |
555 | ||
eb188d0e MP |
556 | return 0; |
557 | } | |
558 | ||
559 | /* Attempt to acquire device lock */ | |
e0423236 ZW |
560 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
561 | hopcount, | |
eb188d0e MP |
562 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); |
563 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
564 | < port->host_deviceid) { | |
565 | /* Delay a bit */ | |
566 | mdelay(1); | |
567 | /* Attempt to acquire device lock again */ | |
e0423236 ZW |
568 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
569 | hopcount, | |
eb188d0e MP |
570 | RIO_HOST_DID_LOCK_CSR, |
571 | port->host_deviceid); | |
572 | } | |
573 | ||
574 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
575 | pr_debug( | |
576 | "RIO: PE locked by a higher priority host...retreating\n"); | |
577 | return -1; | |
578 | } | |
579 | ||
580 | /* Setup new RIO device */ | |
e0423236 ZW |
581 | rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), |
582 | hopcount, 1); | |
583 | if (rdev) { | |
68fe4df5 AB |
584 | rdev->prev = prev; |
585 | if (prev && rio_is_switch(prev)) | |
586 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
587 | } else |
588 | return -1; | |
589 | ||
590 | if (rio_is_switch(rdev)) { | |
de74e00a AB |
591 | int sw_destid; |
592 | int cur_destid; | |
593 | int sw_inport; | |
594 | u16 destid; | |
595 | int port_num; | |
596 | ||
ae05cbd5 | 597 | sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); |
a93192a5 | 598 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
818a04a0 | 599 | port->host_deviceid, sw_inport, 0); |
c70555b0 | 600 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; |
eb188d0e | 601 | |
de74e00a AB |
602 | destid = rio_destid_first(net); |
603 | while (destid != RIO_INVALID_DESTID && destid < next_destid) { | |
604 | if (destid != port->host_deviceid) { | |
605 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, | |
606 | destid, sw_inport, 0); | |
607 | rdev->rswitch->route_table[destid] = sw_inport; | |
608 | } | |
609 | destid = rio_destid_next(net, destid + 1); | |
eb188d0e | 610 | } |
eb188d0e MP |
611 | pr_debug( |
612 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
613 | rio_name(rdev), rdev->vid, rdev->did, |
614 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
c70555b0 | 615 | sw_destid = next_destid; |
68fe4df5 AB |
616 | for (port_num = 0; |
617 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
618 | port_num++) { | |
8d4630dc AB |
619 | if (sw_inport == port_num) { |
620 | rio_enable_rx_tx_port(port, 0, | |
933af4a6 TM |
621 | RIO_ANY_DESTID(port->sys_size), |
622 | hopcount, port_num); | |
e5cabeb3 | 623 | rdev->rswitch->port_ok |= (1 << port_num); |
eb188d0e | 624 | continue; |
e5cabeb3 | 625 | } |
eb188d0e MP |
626 | |
627 | cur_destid = next_destid; | |
628 | ||
1ae842de | 629 | if (rio_sport_is_active(rdev, port_num)) { |
eb188d0e MP |
630 | pr_debug( |
631 | "RIO: scanning device on port %d\n", | |
632 | port_num); | |
8d4630dc AB |
633 | rio_enable_rx_tx_port(port, 0, |
634 | RIO_ANY_DESTID(port->sys_size), | |
635 | hopcount, port_num); | |
e5cabeb3 | 636 | rdev->rswitch->port_ok |= (1 << port_num); |
a93192a5 | 637 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
e0423236 | 638 | RIO_ANY_DESTID(port->sys_size), |
818a04a0 | 639 | port_num, 0); |
eb188d0e | 640 | |
68fe4df5 AB |
641 | if (rio_enum_peer(net, port, hopcount + 1, |
642 | rdev, port_num) < 0) | |
eb188d0e MP |
643 | return -1; |
644 | ||
645 | /* Update routing tables */ | |
de74e00a AB |
646 | destid = rio_destid_next(net, cur_destid + 1); |
647 | if (destid != RIO_INVALID_DESTID) { | |
eb188d0e | 648 | for (destid = cur_destid; |
de74e00a AB |
649 | destid < next_destid;) { |
650 | if (destid != port->host_deviceid) { | |
651 | rio_route_add_entry(rdev, | |
eb188d0e MP |
652 | RIO_GLOBAL_TABLE, |
653 | destid, | |
818a04a0 AB |
654 | port_num, |
655 | 0); | |
de74e00a AB |
656 | rdev->rswitch-> |
657 | route_table[destid] = | |
658 | port_num; | |
659 | } | |
660 | destid = rio_destid_next(net, | |
661 | destid + 1); | |
eb188d0e | 662 | } |
eb188d0e | 663 | } |
e5cabeb3 AB |
664 | } else { |
665 | /* If switch supports Error Management, | |
666 | * set PORT_LOCKOUT bit for unused port | |
667 | */ | |
668 | if (rdev->em_efptr) | |
669 | rio_set_port_lockout(rdev, port_num, 1); | |
670 | ||
671 | rdev->rswitch->port_ok &= ~(1 << port_num); | |
eb188d0e MP |
672 | } |
673 | } | |
c70555b0 | 674 | |
e5cabeb3 AB |
675 | /* Direct Port-write messages to the enumeratiing host */ |
676 | if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && | |
677 | (rdev->em_efptr)) { | |
678 | rio_write_config_32(rdev, | |
679 | rdev->em_efptr + RIO_EM_PW_TGT_DEVID, | |
680 | (port->host_deviceid << 16) | | |
681 | (port->sys_size << 15)); | |
682 | } | |
683 | ||
684 | rio_init_em(rdev); | |
685 | ||
c70555b0 | 686 | /* Check for empty switch */ |
de74e00a AB |
687 | if (next_destid == sw_destid) |
688 | next_destid = rio_destid_alloc(net); | |
c70555b0 | 689 | |
a93192a5 | 690 | rdev->destid = sw_destid; |
eb188d0e MP |
691 | } else |
692 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
693 | rio_name(rdev), rdev->vid, rdev->did); | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
698 | /** | |
699 | * rio_enum_complete- Tests if enumeration of a network is complete | |
700 | * @port: Master port to send transaction | |
701 | * | |
a571259f | 702 | * Tests the PGCCSR discovered bit for non-zero value (enumeration |
e5cabeb3 | 703 | * complete flag). Return %1 if enumeration is complete or %0 if |
eb188d0e MP |
704 | * enumeration is incomplete. |
705 | */ | |
706 | static int rio_enum_complete(struct rio_mport *port) | |
707 | { | |
af84ca38 | 708 | u32 regval; |
eb188d0e | 709 | |
af84ca38 AB |
710 | rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, |
711 | ®val); | |
a571259f | 712 | return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0; |
eb188d0e MP |
713 | } |
714 | ||
715 | /** | |
716 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
717 | * @net: RIO network being discovered | |
718 | * @port: Master port to send transactions | |
719 | * @destid: Current destination ID in network | |
720 | * @hopcount: Number of hops into the network | |
9b310acc RD |
721 | * @prev: previous rio_dev |
722 | * @prev_port: previous port number | |
eb188d0e MP |
723 | * |
724 | * Recursively discovers a RIO network. Transactions are sent via the | |
725 | * master port passed in @port. | |
726 | */ | |
305c891e | 727 | static int |
eb188d0e | 728 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, |
17e96205 | 729 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e MP |
730 | { |
731 | u8 port_num, route_port; | |
eb188d0e MP |
732 | struct rio_dev *rdev; |
733 | u16 ndestid; | |
734 | ||
735 | /* Setup new RIO device */ | |
736 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
17e96205 AB |
737 | rdev->prev = prev; |
738 | if (prev && rio_is_switch(prev)) | |
739 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
740 | } else |
741 | return -1; | |
742 | ||
743 | if (rio_is_switch(rdev)) { | |
eb188d0e | 744 | /* Associated destid is how we accessed this switch */ |
a93192a5 | 745 | rdev->destid = destid; |
eb188d0e | 746 | |
eb188d0e MP |
747 | pr_debug( |
748 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
749 | rio_name(rdev), rdev->vid, rdev->did, |
750 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
751 | for (port_num = 0; | |
752 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
753 | port_num++) { | |
ae05cbd5 | 754 | if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) |
eb188d0e MP |
755 | continue; |
756 | ||
1ae842de | 757 | if (rio_sport_is_active(rdev, port_num)) { |
eb188d0e MP |
758 | pr_debug( |
759 | "RIO: scanning device on port %d\n", | |
760 | port_num); | |
818a04a0 AB |
761 | |
762 | rio_lock_device(port, destid, hopcount, 1000); | |
763 | ||
e0423236 ZW |
764 | for (ndestid = 0; |
765 | ndestid < RIO_ANY_DESTID(port->sys_size); | |
eb188d0e | 766 | ndestid++) { |
a93192a5 | 767 | rio_route_get_entry(rdev, |
eb188d0e MP |
768 | RIO_GLOBAL_TABLE, |
769 | ndestid, | |
818a04a0 | 770 | &route_port, 0); |
eb188d0e MP |
771 | if (route_port == port_num) |
772 | break; | |
773 | } | |
774 | ||
af84ca38 AB |
775 | if (ndestid == RIO_ANY_DESTID(port->sys_size)) |
776 | continue; | |
818a04a0 | 777 | rio_unlock_device(port, destid, hopcount); |
17e96205 AB |
778 | if (rio_disc_peer(net, port, ndestid, |
779 | hopcount + 1, rdev, port_num) < 0) | |
eb188d0e MP |
780 | return -1; |
781 | } | |
782 | } | |
783 | } else | |
784 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
785 | rio_name(rdev), rdev->vid, rdev->did); | |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
790 | /** | |
791 | * rio_mport_is_active- Tests if master port link is active | |
792 | * @port: Master port to test | |
793 | * | |
794 | * Reads the port error status CSR for the master port to | |
795 | * determine if the port has an active link. Returns | |
e5cabeb3 | 796 | * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active |
eb188d0e MP |
797 | * or %0 if it is inactive. |
798 | */ | |
799 | static int rio_mport_is_active(struct rio_mport *port) | |
800 | { | |
801 | u32 result = 0; | |
eb188d0e | 802 | |
1ae842de AB |
803 | rio_local_read_config_32(port, |
804 | port->phys_efptr + | |
805 | RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap), | |
806 | &result); | |
e5cabeb3 | 807 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
808 | } |
809 | ||
e6b585ca AB |
810 | static void rio_scan_release_net(struct rio_net *net) |
811 | { | |
812 | pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id); | |
813 | kfree(net->enum_data); | |
814 | } | |
815 | ||
816 | static void rio_scan_release_dev(struct device *dev) | |
817 | { | |
818 | struct rio_net *net; | |
819 | ||
820 | net = to_rio_net(dev); | |
821 | pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id); | |
822 | kfree(net); | |
823 | } | |
824 | ||
825 | /* | |
826 | * rio_scan_alloc_net - Allocate and configure a new RIO network | |
827 | * @mport: Master port associated with the RIO network | |
de74e00a AB |
828 | * @do_enum: Enumeration/Discovery mode flag |
829 | * @start: logical minimal start id for new net | |
eb188d0e | 830 | * |
e6b585ca AB |
831 | * Allocates a new RIO network structure and initializes enumerator-specific |
832 | * part of it (if required). | |
833 | * Returns a RIO network pointer on success or %NULL on failure. | |
eb188d0e | 834 | */ |
e6b585ca AB |
835 | static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport, |
836 | int do_enum, u16 start) | |
eb188d0e MP |
837 | { |
838 | struct rio_net *net; | |
839 | ||
e6b585ca AB |
840 | net = rio_alloc_net(mport); |
841 | ||
de74e00a | 842 | if (net && do_enum) { |
e6b585ca AB |
843 | struct rio_id_table *idtab; |
844 | size_t size; | |
845 | ||
846 | size = sizeof(struct rio_id_table) + | |
847 | BITS_TO_LONGS( | |
848 | RIO_MAX_ROUTE_ENTRIES(mport->sys_size) | |
849 | ) * sizeof(long); | |
de74e00a | 850 | |
e6b585ca AB |
851 | idtab = kzalloc(size, GFP_KERNEL); |
852 | ||
853 | if (idtab == NULL) { | |
de74e00a | 854 | pr_err("RIO: failed to allocate destID table\n"); |
e6b585ca | 855 | rio_free_net(net); |
de74e00a AB |
856 | net = NULL; |
857 | } else { | |
e6b585ca AB |
858 | net->enum_data = idtab; |
859 | net->release = rio_scan_release_net; | |
860 | idtab->start = start; | |
861 | idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size); | |
862 | spin_lock_init(&idtab->lock); | |
de74e00a AB |
863 | } |
864 | } | |
865 | ||
eb188d0e | 866 | if (net) { |
e6b585ca AB |
867 | net->id = mport->id; |
868 | net->hport = mport; | |
869 | dev_set_name(&net->dev, "rnet_%d", net->id); | |
870 | net->dev.parent = &mport->dev; | |
871 | net->dev.release = rio_scan_release_dev; | |
872 | rio_add_net(net); | |
eb188d0e | 873 | } |
e6b585ca | 874 | |
eb188d0e MP |
875 | return net; |
876 | } | |
877 | ||
c70555b0 AB |
878 | /** |
879 | * rio_update_route_tables- Updates route tables in switches | |
a7071efc | 880 | * @net: RIO network to run update on |
c70555b0 AB |
881 | * |
882 | * For each enumerated device, ensure that each switch in a system | |
883 | * has correct routing entries. Add routes for devices that where | |
b94bb1f6 | 884 | * unknown during the first enumeration pass through the switch. |
c70555b0 | 885 | */ |
a7071efc | 886 | static void rio_update_route_tables(struct rio_net *net) |
c70555b0 | 887 | { |
ded05782 | 888 | struct rio_dev *rdev, *swrdev; |
c70555b0 AB |
889 | struct rio_switch *rswitch; |
890 | u8 sport; | |
891 | u16 destid; | |
892 | ||
a7071efc | 893 | list_for_each_entry(rdev, &net->devices, net_list) { |
c70555b0 | 894 | |
a93192a5 | 895 | destid = rdev->destid; |
c70555b0 | 896 | |
a7071efc | 897 | list_for_each_entry(rswitch, &net->switches, node) { |
c70555b0 AB |
898 | |
899 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
900 | continue; | |
901 | ||
902 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
ded05782 AB |
903 | swrdev = sw_to_rio_dev(rswitch); |
904 | ||
07590ff0 | 905 | /* Skip if destid ends in empty switch*/ |
ded05782 | 906 | if (swrdev->destid == destid) |
07590ff0 | 907 | continue; |
c70555b0 | 908 | |
ded05782 | 909 | sport = RIO_GET_PORT_NUM(swrdev->swpinfo); |
c70555b0 | 910 | |
2ec3ba69 AB |
911 | rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE, |
912 | destid, sport, 0); | |
913 | rswitch->route_table[destid] = sport; | |
c70555b0 AB |
914 | } |
915 | } | |
916 | } | |
917 | } | |
918 | ||
e5cabeb3 AB |
919 | /** |
920 | * rio_init_em - Initializes RIO Error Management (for switches) | |
97ef6f74 | 921 | * @rdev: RIO device |
e5cabeb3 AB |
922 | * |
923 | * For each enumerated switch, call device-specific error management | |
924 | * initialization routine (if supplied by the switch driver). | |
925 | */ | |
926 | static void rio_init_em(struct rio_dev *rdev) | |
927 | { | |
928 | if (rio_is_switch(rdev) && (rdev->em_efptr) && | |
2ec3ba69 AB |
929 | rdev->rswitch->ops && rdev->rswitch->ops->em_init) { |
930 | rdev->rswitch->ops->em_init(rdev); | |
e5cabeb3 AB |
931 | } |
932 | } | |
933 | ||
eb188d0e MP |
934 | /** |
935 | * rio_enum_mport- Start enumeration through a master port | |
936 | * @mport: Master port to send transactions | |
bc8fcfea | 937 | * @flags: Enumeration control flags |
eb188d0e MP |
938 | * |
939 | * Starts the enumeration process. If somebody has enumerated our | |
940 | * master port device, then give up. If not and we have an active | |
941 | * link, then start recursive peer enumeration. Returns %0 if | |
942 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
943 | */ | |
36f0efbb | 944 | static int rio_enum_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
945 | { |
946 | struct rio_net *net = NULL; | |
947 | int rc = 0; | |
948 | ||
949 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
950 | mport->name); | |
bc8fcfea AB |
951 | |
952 | /* | |
953 | * To avoid multiple start requests (repeat enumeration is not supported | |
954 | * by this method) check if enumeration/discovery was performed for this | |
955 | * mport: if mport was added into the list of mports for a net exit | |
956 | * with error. | |
957 | */ | |
958 | if (mport->nnode.next || mport->nnode.prev) | |
959 | return -EBUSY; | |
960 | ||
eb188d0e MP |
961 | /* If somebody else enumerated our master port device, bail. */ |
962 | if (rio_enum_host(mport) < 0) { | |
963 | printk(KERN_INFO | |
964 | "RIO: master port %d device has been enumerated by a remote host\n", | |
965 | mport->id); | |
966 | rc = -EBUSY; | |
967 | goto out; | |
968 | } | |
969 | ||
970 | /* If master port has an active link, allocate net and enum peers */ | |
971 | if (rio_mport_is_active(mport)) { | |
e6b585ca | 972 | net = rio_scan_alloc_net(mport, 1, 0); |
de74e00a | 973 | if (!net) { |
eb188d0e MP |
974 | printk(KERN_ERR "RIO: failed to allocate new net\n"); |
975 | rc = -ENOMEM; | |
976 | goto out; | |
977 | } | |
933af4a6 | 978 | |
de74e00a AB |
979 | /* reserve mport destID in new net */ |
980 | rio_destid_reserve(net, mport->host_deviceid); | |
981 | ||
b94bb1f6 | 982 | /* Enable Input Output Port (transmitter receiver) */ |
933af4a6 TM |
983 | rio_enable_rx_tx_port(mport, 1, 0, 0, 0); |
984 | ||
af84ca38 AB |
985 | /* Set component tag for host */ |
986 | rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, | |
987 | next_comptag++); | |
988 | ||
de74e00a AB |
989 | next_destid = rio_destid_alloc(net); |
990 | ||
68fe4df5 | 991 | if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { |
eb188d0e MP |
992 | /* A higher priority host won enumeration, bail. */ |
993 | printk(KERN_INFO | |
994 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
995 | mport->id); | |
a7071efc | 996 | rio_clear_locks(net); |
eb188d0e MP |
997 | rc = -EBUSY; |
998 | goto out; | |
999 | } | |
de74e00a AB |
1000 | /* free the last allocated destID (unused) */ |
1001 | rio_destid_free(net, next_destid); | |
a7071efc AB |
1002 | rio_update_route_tables(net); |
1003 | rio_clear_locks(net); | |
e5cabeb3 | 1004 | rio_pw_enable(mport, 1); |
eb188d0e MP |
1005 | } else { |
1006 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
1007 | mport->id); | |
1008 | rc = -EINVAL; | |
1009 | } | |
1010 | ||
1011 | out: | |
1012 | return rc; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * rio_build_route_tables- Generate route tables from switch route entries | |
a7071efc | 1017 | * @net: RIO network to run route tables scan on |
eb188d0e MP |
1018 | * |
1019 | * For each switch device, generate a route table by copying existing | |
1020 | * route entries from the switch. | |
1021 | */ | |
a7071efc | 1022 | static void rio_build_route_tables(struct rio_net *net) |
eb188d0e | 1023 | { |
a7071efc | 1024 | struct rio_switch *rswitch; |
eb188d0e MP |
1025 | struct rio_dev *rdev; |
1026 | int i; | |
1027 | u8 sport; | |
1028 | ||
a7071efc AB |
1029 | list_for_each_entry(rswitch, &net->switches, node) { |
1030 | rdev = sw_to_rio_dev(rswitch); | |
818a04a0 | 1031 | |
a7071efc AB |
1032 | rio_lock_device(net->hport, rdev->destid, |
1033 | rdev->hopcount, 1000); | |
1034 | for (i = 0; | |
1035 | i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size); | |
1036 | i++) { | |
1037 | if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE, | |
1038 | i, &sport, 0) < 0) | |
1039 | continue; | |
1040 | rswitch->route_table[i] = sport; | |
eb188d0e | 1041 | } |
a7071efc AB |
1042 | |
1043 | rio_unlock_device(net->hport, rdev->destid, rdev->hopcount); | |
1044 | } | |
eb188d0e MP |
1045 | } |
1046 | ||
eb188d0e MP |
1047 | /** |
1048 | * rio_disc_mport- Start discovery through a master port | |
1049 | * @mport: Master port to send transactions | |
bc8fcfea | 1050 | * @flags: discovery control flags |
eb188d0e MP |
1051 | * |
1052 | * Starts the discovery process. If we have an active link, | |
bc8fcfea AB |
1053 | * then wait for the signal that enumeration is complete (if wait |
1054 | * is allowed). | |
eb188d0e MP |
1055 | * When enumeration completion is signaled, start recursive |
1056 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
1057 | * on failure. | |
1058 | */ | |
36f0efbb | 1059 | static int rio_disc_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
1060 | { |
1061 | struct rio_net *net = NULL; | |
fa3dbaa0 | 1062 | unsigned long to_end; |
eb188d0e MP |
1063 | |
1064 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
1065 | mport->name); | |
1066 | ||
1067 | /* If master port has an active link, allocate net and discover peers */ | |
1068 | if (rio_mport_is_active(mport)) { | |
bc8fcfea AB |
1069 | if (rio_enum_complete(mport)) |
1070 | goto enum_done; | |
1071 | else if (flags & RIO_SCAN_ENUM_NO_WAIT) | |
1072 | return -EAGAIN; | |
1073 | ||
fa3dbaa0 | 1074 | pr_debug("RIO: wait for enumeration to complete...\n"); |
eb188d0e | 1075 | |
fa3dbaa0 AB |
1076 | to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; |
1077 | while (time_before(jiffies, to_end)) { | |
1078 | if (rio_enum_complete(mport)) | |
1079 | goto enum_done; | |
f4c9c0e8 | 1080 | msleep(10); |
eb188d0e | 1081 | } |
eb188d0e | 1082 | |
fa3dbaa0 AB |
1083 | pr_debug("RIO: discovery timeout on mport %d %s\n", |
1084 | mport->id, mport->name); | |
1085 | goto bail; | |
1086 | enum_done: | |
1087 | pr_debug("RIO: ... enumeration done\n"); | |
1088 | ||
e6b585ca | 1089 | net = rio_scan_alloc_net(mport, 0, 0); |
fa3dbaa0 AB |
1090 | if (!net) { |
1091 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
1092 | goto bail; | |
1093 | } | |
818a04a0 AB |
1094 | |
1095 | /* Read DestID assigned by enumerator */ | |
1096 | rio_local_read_config_32(mport, RIO_DID_CSR, | |
1097 | &mport->host_deviceid); | |
1098 | mport->host_deviceid = RIO_GET_DID(mport->sys_size, | |
1099 | mport->host_deviceid); | |
1100 | ||
e0423236 | 1101 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), |
17e96205 | 1102 | 0, NULL, 0) < 0) { |
eb188d0e MP |
1103 | printk(KERN_INFO |
1104 | "RIO: master port %d device has failed discovery\n", | |
1105 | mport->id); | |
1106 | goto bail; | |
1107 | } | |
1108 | ||
a7071efc | 1109 | rio_build_route_tables(net); |
eb188d0e MP |
1110 | } |
1111 | ||
1112 | return 0; | |
fa3dbaa0 | 1113 | bail: |
eb188d0e MP |
1114 | return -EBUSY; |
1115 | } | |
a11650e1 AB |
1116 | |
1117 | static struct rio_scan rio_scan_ops = { | |
9edbc30b | 1118 | .owner = THIS_MODULE, |
a11650e1 AB |
1119 | .enumerate = rio_enum_mport, |
1120 | .discover = rio_disc_mport, | |
1121 | }; | |
1122 | ||
1123 | static bool scan; | |
1124 | module_param(scan, bool, 0); | |
1125 | MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery " | |
1126 | "(default = 0)"); | |
1127 | ||
1128 | /** | |
1129 | * rio_basic_attach: | |
1130 | * | |
1131 | * When this enumeration/discovery method is loaded as a module this function | |
1132 | * registers its specific enumeration and discover routines for all available | |
1133 | * RapidIO mport devices. The "scan" command line parameter controls ability of | |
1134 | * the module to start RapidIO enumeration/discovery automatically. | |
1135 | * | |
1136 | * Returns 0 for success or -EIO if unable to register itself. | |
1137 | * | |
1138 | * This enumeration/discovery method cannot be unloaded and therefore does not | |
1139 | * provide a matching cleanup_module routine. | |
1140 | */ | |
1141 | ||
1142 | static int __init rio_basic_attach(void) | |
1143 | { | |
1144 | if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops)) | |
1145 | return -EIO; | |
1146 | if (scan) | |
1147 | rio_init_mports(); | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | late_initcall(rio_basic_attach); | |
1152 | ||
1153 | MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery"); | |
1154 | MODULE_LICENSE("GPL"); |