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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 | ||
eb188d0e | 42 | static int next_destid = 0; |
af84ca38 | 43 | static int next_comptag = 1; |
eb188d0e | 44 | |
eb188d0e MP |
45 | static int rio_mport_phys_table[] = { |
46 | RIO_EFB_PAR_EP_ID, | |
47 | RIO_EFB_PAR_EP_REC_ID, | |
48 | RIO_EFB_SER_EP_ID, | |
49 | RIO_EFB_SER_EP_REC_ID, | |
50 | -1, | |
51 | }; | |
52 | ||
de74e00a | 53 | |
4ed134be | 54 | /** |
de74e00a | 55 | * rio_destid_alloc - Allocate next available destID for given network |
4ed134be | 56 | * @net: RIO network |
de74e00a AB |
57 | * |
58 | * Returns next available device destination ID for the specified RIO network. | |
59 | * Marks allocated ID as one in use. | |
60 | * Returns RIO_INVALID_DESTID if new destID is not available. | |
61 | */ | |
62 | static u16 rio_destid_alloc(struct rio_net *net) | |
63 | { | |
64 | int destid; | |
65 | struct rio_id_table *idtab = &net->destid_table; | |
66 | ||
67 | spin_lock(&idtab->lock); | |
4ed134be | 68 | destid = find_first_zero_bit(idtab->table, idtab->max); |
de74e00a AB |
69 | |
70 | if (destid < idtab->max) { | |
de74e00a AB |
71 | set_bit(destid, idtab->table); |
72 | destid += idtab->start; | |
73 | } else | |
74 | destid = RIO_INVALID_DESTID; | |
75 | ||
76 | spin_unlock(&idtab->lock); | |
77 | return (u16)destid; | |
78 | } | |
79 | ||
4ed134be | 80 | /** |
de74e00a | 81 | * rio_destid_reserve - Reserve the specivied destID |
4ed134be AB |
82 | * @net: RIO network |
83 | * @destid: destID to reserve | |
de74e00a AB |
84 | * |
85 | * Tries to reserve the specified destID. | |
86 | * Returns 0 if successfull. | |
87 | */ | |
88 | static int rio_destid_reserve(struct rio_net *net, u16 destid) | |
89 | { | |
90 | int oldbit; | |
91 | struct rio_id_table *idtab = &net->destid_table; | |
92 | ||
93 | destid -= idtab->start; | |
94 | spin_lock(&idtab->lock); | |
95 | oldbit = test_and_set_bit(destid, idtab->table); | |
96 | spin_unlock(&idtab->lock); | |
97 | return oldbit; | |
98 | } | |
99 | ||
4ed134be | 100 | /** |
de74e00a | 101 | * rio_destid_free - free a previously allocated destID |
4ed134be AB |
102 | * @net: RIO network |
103 | * @destid: destID to free | |
de74e00a AB |
104 | * |
105 | * Makes the specified destID available for use. | |
106 | */ | |
107 | static void rio_destid_free(struct rio_net *net, u16 destid) | |
108 | { | |
109 | struct rio_id_table *idtab = &net->destid_table; | |
110 | ||
111 | destid -= idtab->start; | |
112 | spin_lock(&idtab->lock); | |
113 | clear_bit(destid, idtab->table); | |
114 | spin_unlock(&idtab->lock); | |
115 | } | |
116 | ||
4ed134be | 117 | /** |
de74e00a | 118 | * rio_destid_first - return first destID in use |
4ed134be | 119 | * @net: RIO network |
de74e00a AB |
120 | */ |
121 | static u16 rio_destid_first(struct rio_net *net) | |
122 | { | |
123 | int destid; | |
124 | struct rio_id_table *idtab = &net->destid_table; | |
125 | ||
126 | spin_lock(&idtab->lock); | |
127 | destid = find_first_bit(idtab->table, idtab->max); | |
128 | if (destid >= idtab->max) | |
129 | destid = RIO_INVALID_DESTID; | |
130 | else | |
131 | destid += idtab->start; | |
132 | spin_unlock(&idtab->lock); | |
133 | return (u16)destid; | |
134 | } | |
135 | ||
4ed134be | 136 | /** |
de74e00a | 137 | * rio_destid_next - return next destID in use |
4ed134be AB |
138 | * @net: RIO network |
139 | * @from: destination ID from which search shall continue | |
de74e00a AB |
140 | */ |
141 | static u16 rio_destid_next(struct rio_net *net, u16 from) | |
142 | { | |
143 | int destid; | |
144 | struct rio_id_table *idtab = &net->destid_table; | |
145 | ||
146 | spin_lock(&idtab->lock); | |
147 | destid = find_next_bit(idtab->table, idtab->max, from); | |
148 | if (destid >= idtab->max) | |
149 | destid = RIO_INVALID_DESTID; | |
150 | else | |
151 | destid += idtab->start; | |
152 | spin_unlock(&idtab->lock); | |
153 | return (u16)destid; | |
154 | } | |
155 | ||
eb188d0e MP |
156 | /** |
157 | * rio_get_device_id - Get the base/extended device id for a device | |
158 | * @port: RIO master port | |
159 | * @destid: Destination ID of device | |
160 | * @hopcount: Hopcount to device | |
161 | * | |
162 | * Reads the base/extended device id from a device. Returns the | |
163 | * 8/16-bit device ID. | |
164 | */ | |
165 | static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) | |
166 | { | |
167 | u32 result; | |
168 | ||
169 | rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); | |
170 | ||
e0423236 | 171 | return RIO_GET_DID(port->sys_size, result); |
eb188d0e MP |
172 | } |
173 | ||
174 | /** | |
175 | * rio_set_device_id - Set the base/extended device id for a device | |
176 | * @port: RIO master port | |
177 | * @destid: Destination ID of device | |
178 | * @hopcount: Hopcount to device | |
179 | * @did: Device ID value to be written | |
180 | * | |
181 | * Writes the base/extended device id from a device. | |
182 | */ | |
fa78cc51 | 183 | static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) |
eb188d0e MP |
184 | { |
185 | rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, | |
e0423236 | 186 | RIO_SET_DID(port->sys_size, did)); |
eb188d0e MP |
187 | } |
188 | ||
189 | /** | |
190 | * rio_local_set_device_id - Set the base/extended device id for a port | |
191 | * @port: RIO master port | |
192 | * @did: Device ID value to be written | |
193 | * | |
194 | * Writes the base/extended device id from a device. | |
195 | */ | |
196 | static void rio_local_set_device_id(struct rio_mport *port, u16 did) | |
197 | { | |
e0423236 ZW |
198 | rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size, |
199 | did)); | |
eb188d0e MP |
200 | } |
201 | ||
202 | /** | |
203 | * rio_clear_locks- Release all host locks and signal enumeration complete | |
a7071efc | 204 | * @net: RIO network to run on |
eb188d0e MP |
205 | * |
206 | * Marks the component tag CSR on each device with the enumeration | |
207 | * complete flag. When complete, it then release the host locks on | |
208 | * each device. Returns 0 on success or %-EINVAL on failure. | |
209 | */ | |
a7071efc | 210 | static int rio_clear_locks(struct rio_net *net) |
eb188d0e | 211 | { |
a7071efc | 212 | struct rio_mport *port = net->hport; |
eb188d0e MP |
213 | struct rio_dev *rdev; |
214 | u32 result; | |
215 | int ret = 0; | |
216 | ||
eb188d0e MP |
217 | /* Release host device id locks */ |
218 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
219 | port->host_deviceid); | |
220 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
221 | if ((result & 0xffff) != 0xffff) { | |
222 | printk(KERN_INFO | |
223 | "RIO: badness when releasing host lock on master port, result %8.8x\n", | |
224 | result); | |
225 | ret = -EINVAL; | |
226 | } | |
a7071efc | 227 | list_for_each_entry(rdev, &net->devices, net_list) { |
eb188d0e MP |
228 | rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, |
229 | port->host_deviceid); | |
230 | rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); | |
231 | if ((result & 0xffff) != 0xffff) { | |
232 | printk(KERN_INFO | |
233 | "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", | |
234 | rdev->vid, rdev->did); | |
235 | ret = -EINVAL; | |
236 | } | |
af84ca38 AB |
237 | |
238 | /* Mark device as discovered and enable master */ | |
239 | rio_read_config_32(rdev, | |
240 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
241 | &result); | |
242 | result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; | |
243 | rio_write_config_32(rdev, | |
244 | rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, | |
245 | result); | |
eb188d0e MP |
246 | } |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
251 | /** | |
252 | * rio_enum_host- Set host lock and initialize host destination ID | |
253 | * @port: Master port to issue transaction | |
254 | * | |
255 | * Sets the local host master port lock and destination ID register | |
256 | * with the host device ID value. The host device ID value is provided | |
257 | * by the platform. Returns %0 on success or %-1 on failure. | |
258 | */ | |
259 | static int rio_enum_host(struct rio_mport *port) | |
260 | { | |
261 | u32 result; | |
262 | ||
263 | /* Set master port host device id lock */ | |
264 | rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, | |
265 | port->host_deviceid); | |
266 | ||
267 | rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); | |
268 | if ((result & 0xffff) != port->host_deviceid) | |
269 | return -1; | |
270 | ||
271 | /* Set master port destid and init destid ctr */ | |
272 | rio_local_set_device_id(port, port->host_deviceid); | |
eb188d0e MP |
273 | return 0; |
274 | } | |
275 | ||
276 | /** | |
277 | * rio_device_has_destid- Test if a device contains a destination ID register | |
278 | * @port: Master port to issue transaction | |
279 | * @src_ops: RIO device source operations | |
280 | * @dst_ops: RIO device destination operations | |
281 | * | |
282 | * Checks the provided @src_ops and @dst_ops for the necessary transaction | |
283 | * capabilities that indicate whether or not a device will implement a | |
284 | * destination ID register. Returns 1 if true or 0 if false. | |
285 | */ | |
286 | static int rio_device_has_destid(struct rio_mport *port, int src_ops, | |
287 | int dst_ops) | |
288 | { | |
fa78cc51 MP |
289 | 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; |
290 | ||
291 | return !!((src_ops | dst_ops) & mask); | |
eb188d0e MP |
292 | } |
293 | ||
294 | /** | |
295 | * rio_release_dev- Frees a RIO device struct | |
296 | * @dev: LDM device associated with a RIO device struct | |
297 | * | |
298 | * Gets the RIO device struct associated a RIO device struct. | |
299 | * The RIO device struct is freed. | |
300 | */ | |
301 | static void rio_release_dev(struct device *dev) | |
302 | { | |
303 | struct rio_dev *rdev; | |
304 | ||
305 | rdev = to_rio_dev(dev); | |
306 | kfree(rdev); | |
307 | } | |
308 | ||
309 | /** | |
310 | * rio_is_switch- Tests if a RIO device has switch capabilities | |
311 | * @rdev: RIO device | |
312 | * | |
313 | * Gets the RIO device Processing Element Features register | |
314 | * contents and tests for switch capabilities. Returns 1 if | |
315 | * the device is a switch or 0 if it is not a switch. | |
316 | * The RIO device struct is freed. | |
317 | */ | |
318 | static int rio_is_switch(struct rio_dev *rdev) | |
319 | { | |
320 | if (rdev->pef & RIO_PEF_SWITCH) | |
321 | return 1; | |
322 | return 0; | |
323 | } | |
324 | ||
eb188d0e MP |
325 | /** |
326 | * rio_setup_device- Allocates and sets up a RIO device | |
327 | * @net: RIO network | |
328 | * @port: Master port to send transactions | |
329 | * @destid: Current destination ID | |
330 | * @hopcount: Current hopcount | |
331 | * @do_enum: Enumeration/Discovery mode flag | |
332 | * | |
333 | * Allocates a RIO device and configures fields based on configuration | |
334 | * space contents. If device has a destination ID register, a destination | |
335 | * ID is either assigned in enumeration mode or read from configuration | |
336 | * space in discovery mode. If the device has switch capabilities, then | |
337 | * a switch is allocated and configured appropriately. Returns a pointer | |
338 | * to a RIO device on success or NULL on failure. | |
339 | * | |
340 | */ | |
305c891e | 341 | static struct rio_dev *rio_setup_device(struct rio_net *net, |
eb188d0e MP |
342 | struct rio_mport *port, u16 destid, |
343 | u8 hopcount, int do_enum) | |
344 | { | |
5f28c520 | 345 | int ret = 0; |
eb188d0e | 346 | struct rio_dev *rdev; |
5f28c520 | 347 | struct rio_switch *rswitch = NULL; |
eb188d0e | 348 | int result, rdid; |
ded05782 AB |
349 | size_t size; |
350 | u32 swpinfo = 0; | |
eb188d0e | 351 | |
ded05782 AB |
352 | size = sizeof(struct rio_dev); |
353 | if (rio_mport_read_config_32(port, destid, hopcount, | |
354 | RIO_PEF_CAR, &result)) | |
355 | return NULL; | |
356 | ||
357 | if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) { | |
358 | rio_mport_read_config_32(port, destid, hopcount, | |
359 | RIO_SWP_INFO_CAR, &swpinfo); | |
360 | if (result & RIO_PEF_SWITCH) { | |
361 | size += (RIO_GET_TOTAL_PORTS(swpinfo) * | |
362 | sizeof(rswitch->nextdev[0])) + sizeof(*rswitch); | |
363 | } | |
364 | } | |
365 | ||
366 | rdev = kzalloc(size, GFP_KERNEL); | |
eb188d0e | 367 | if (!rdev) |
5f28c520 | 368 | return NULL; |
eb188d0e | 369 | |
eb188d0e | 370 | rdev->net = net; |
ded05782 AB |
371 | rdev->pef = result; |
372 | rdev->swpinfo = swpinfo; | |
eb188d0e MP |
373 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, |
374 | &result); | |
375 | rdev->did = result >> 16; | |
376 | rdev->vid = result & 0xffff; | |
377 | rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, | |
378 | &rdev->device_rev); | |
379 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, | |
380 | &result); | |
381 | rdev->asm_did = result >> 16; | |
382 | rdev->asm_vid = result & 0xffff; | |
383 | rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, | |
384 | &result); | |
385 | rdev->asm_rev = result >> 16; | |
e5cabeb3 | 386 | if (rdev->pef & RIO_PEF_EXT_FEATURES) { |
eb188d0e | 387 | rdev->efptr = result & 0xffff; |
e5cabeb3 AB |
388 | rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid, |
389 | hopcount); | |
390 | ||
391 | rdev->em_efptr = rio_mport_get_feature(port, 0, destid, | |
392 | hopcount, RIO_EFB_ERR_MGMNT); | |
393 | } | |
eb188d0e MP |
394 | |
395 | rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, | |
396 | &rdev->src_ops); | |
397 | rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, | |
398 | &rdev->dst_ops); | |
399 | ||
af84ca38 AB |
400 | if (do_enum) { |
401 | /* Assign component tag to device */ | |
402 | if (next_comptag >= 0x10000) { | |
403 | pr_err("RIO: Component Tag Counter Overflow\n"); | |
404 | goto cleanup; | |
405 | } | |
406 | rio_mport_write_config_32(port, destid, hopcount, | |
407 | RIO_COMPONENT_TAG_CSR, next_comptag); | |
408 | rdev->comp_tag = next_comptag++; | |
2ec3ba69 | 409 | rdev->do_enum = true; |
558bda65 AB |
410 | } else { |
411 | rio_mport_read_config_32(port, destid, hopcount, | |
412 | RIO_COMPONENT_TAG_CSR, | |
413 | &rdev->comp_tag); | |
af84ca38 AB |
414 | } |
415 | ||
c70555b0 AB |
416 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
417 | if (do_enum) { | |
418 | rio_set_device_id(port, destid, hopcount, next_destid); | |
de74e00a AB |
419 | rdev->destid = next_destid; |
420 | next_destid = rio_destid_alloc(net); | |
c70555b0 AB |
421 | } else |
422 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
a93192a5 AB |
423 | |
424 | rdev->hopcount = 0xff; | |
425 | } else { | |
426 | /* Switch device has an associated destID which | |
427 | * will be adjusted later | |
428 | */ | |
429 | rdev->destid = destid; | |
430 | rdev->hopcount = hopcount; | |
431 | } | |
eb188d0e MP |
432 | |
433 | /* If a PE has both switch and other functions, show it as a switch */ | |
434 | if (rio_is_switch(rdev)) { | |
ded05782 | 435 | rswitch = rdev->rswitch; |
e5cabeb3 | 436 | rswitch->port_ok = 0; |
2ec3ba69 | 437 | spin_lock_init(&rswitch->lock); |
e0423236 ZW |
438 | rswitch->route_table = kzalloc(sizeof(u8)* |
439 | RIO_MAX_ROUTE_ENTRIES(port->sys_size), | |
440 | GFP_KERNEL); | |
5f28c520 YL |
441 | if (!rswitch->route_table) |
442 | goto cleanup; | |
eb188d0e | 443 | /* Initialize switch route table */ |
e0423236 ZW |
444 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); |
445 | rdid++) | |
eb188d0e | 446 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; |
b53c7583 | 447 | dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, |
6ca40c25 | 448 | rdev->comp_tag & RIO_CTAG_UDEVID); |
eb188d0e | 449 | |
2ec3ba69 AB |
450 | if (do_enum) |
451 | rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0); | |
07590ff0 | 452 | |
a7071efc | 453 | list_add_tail(&rswitch->node, &net->switches); |
eb188d0e | 454 | |
933af4a6 TM |
455 | } else { |
456 | if (do_enum) | |
457 | /*Enable Input Output Port (transmitter reviever)*/ | |
458 | rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); | |
459 | ||
b53c7583 | 460 | dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, |
6ca40c25 | 461 | rdev->comp_tag & RIO_CTAG_UDEVID); |
933af4a6 | 462 | } |
eb188d0e | 463 | |
a11650e1 | 464 | rio_attach_device(rdev); |
eb188d0e MP |
465 | |
466 | device_initialize(&rdev->dev); | |
467 | rdev->dev.release = rio_release_dev; | |
468 | rio_dev_get(rdev); | |
469 | ||
284901a9 | 470 | rdev->dma_mask = DMA_BIT_MASK(32); |
fa78cc51 | 471 | rdev->dev.dma_mask = &rdev->dma_mask; |
284901a9 | 472 | rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
eb188d0e | 473 | |
284fb68d | 474 | if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) |
eb188d0e MP |
475 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], |
476 | 0, 0xffff); | |
477 | ||
5f28c520 YL |
478 | ret = rio_add_device(rdev); |
479 | if (ret) | |
480 | goto cleanup; | |
eb188d0e | 481 | |
eb188d0e | 482 | return rdev; |
5f28c520 YL |
483 | |
484 | cleanup: | |
166c050b | 485 | if (rswitch) |
5f28c520 | 486 | kfree(rswitch->route_table); |
ded05782 | 487 | |
5f28c520 YL |
488 | kfree(rdev); |
489 | return NULL; | |
eb188d0e MP |
490 | } |
491 | ||
492 | /** | |
493 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
494 | * @port: Master port to send transaction | |
495 | * @destid: Associated destination ID for switch | |
496 | * @hopcount: Hopcount to reach switch | |
497 | * @sport: Switch port number | |
498 | * | |
499 | * Reads the port error status CSR for a particular switch port to | |
500 | * determine if the port has an active link. Returns | |
e5cabeb3 | 501 | * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is |
eb188d0e MP |
502 | * inactive. |
503 | */ | |
504 | static int | |
505 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
506 | { | |
e5cabeb3 | 507 | u32 result = 0; |
eb188d0e MP |
508 | u32 ext_ftr_ptr; |
509 | ||
e5cabeb3 | 510 | ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0); |
eb188d0e | 511 | |
e5cabeb3 AB |
512 | while (ext_ftr_ptr) { |
513 | rio_mport_read_config_32(port, destid, hopcount, | |
514 | ext_ftr_ptr, &result); | |
515 | result = RIO_GET_BLOCK_ID(result); | |
516 | if ((result == RIO_EFB_SER_EP_FREE_ID) || | |
517 | (result == RIO_EFB_SER_EP_FREE_ID_V13P) || | |
518 | (result == RIO_EFB_SER_EP_FREC_ID)) | |
eb188d0e | 519 | break; |
e5cabeb3 AB |
520 | |
521 | ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, | |
522 | ext_ftr_ptr); | |
523 | } | |
eb188d0e MP |
524 | |
525 | if (ext_ftr_ptr) | |
526 | rio_mport_read_config_32(port, destid, hopcount, | |
527 | ext_ftr_ptr + | |
528 | RIO_PORT_N_ERR_STS_CSR(sport), | |
529 | &result); | |
530 | ||
e5cabeb3 | 531 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
532 | } |
533 | ||
eb188d0e MP |
534 | /** |
535 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
536 | * @port: Master port to send transaction | |
537 | * @hopcount: Number of hops to the device | |
538 | * | |
539 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
540 | * RIO device. Returns the value of the lock register. | |
541 | */ | |
542 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
543 | { | |
544 | u32 result; | |
545 | ||
e0423236 | 546 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, |
eb188d0e MP |
547 | RIO_HOST_DID_LOCK_CSR, &result); |
548 | ||
549 | return (u16) (result & 0xffff); | |
550 | } | |
551 | ||
eb188d0e MP |
552 | /** |
553 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
554 | * @net: RIO network being enumerated | |
555 | * @port: Master port to send transactions | |
556 | * @hopcount: Number of hops into the network | |
68fe4df5 AB |
557 | * @prev: Previous RIO device connected to the enumerated one |
558 | * @prev_port: Port on previous RIO device | |
eb188d0e MP |
559 | * |
560 | * Recursively enumerates a RIO network. Transactions are sent via the | |
561 | * master port passed in @port. | |
562 | */ | |
305c891e | 563 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, |
68fe4df5 | 564 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e | 565 | { |
eb188d0e | 566 | struct rio_dev *rdev; |
af84ca38 | 567 | u32 regval; |
eb188d0e MP |
568 | int tmp; |
569 | ||
e274e0ed AB |
570 | if (rio_mport_chk_dev_access(port, |
571 | RIO_ANY_DESTID(port->sys_size), hopcount)) { | |
572 | pr_debug("RIO: device access check failed\n"); | |
573 | return -1; | |
574 | } | |
575 | ||
eb188d0e MP |
576 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { |
577 | pr_debug("RIO: PE already discovered by this host\n"); | |
578 | /* | |
579 | * Already discovered by this host. Add it as another | |
af84ca38 | 580 | * link to the existing device. |
eb188d0e | 581 | */ |
af84ca38 AB |
582 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), |
583 | hopcount, RIO_COMPONENT_TAG_CSR, ®val); | |
584 | ||
585 | if (regval) { | |
586 | rdev = rio_get_comptag((regval & 0xffff), NULL); | |
587 | ||
588 | if (rdev && prev && rio_is_switch(prev)) { | |
589 | pr_debug("RIO: redundant path to %s\n", | |
590 | rio_name(rdev)); | |
591 | prev->rswitch->nextdev[prev_port] = rdev; | |
592 | } | |
593 | } | |
594 | ||
eb188d0e MP |
595 | return 0; |
596 | } | |
597 | ||
598 | /* Attempt to acquire device lock */ | |
e0423236 ZW |
599 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
600 | hopcount, | |
eb188d0e MP |
601 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); |
602 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
603 | < port->host_deviceid) { | |
604 | /* Delay a bit */ | |
605 | mdelay(1); | |
606 | /* Attempt to acquire device lock again */ | |
e0423236 ZW |
607 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
608 | hopcount, | |
eb188d0e MP |
609 | RIO_HOST_DID_LOCK_CSR, |
610 | port->host_deviceid); | |
611 | } | |
612 | ||
613 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
614 | pr_debug( | |
615 | "RIO: PE locked by a higher priority host...retreating\n"); | |
616 | return -1; | |
617 | } | |
618 | ||
619 | /* Setup new RIO device */ | |
e0423236 ZW |
620 | rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), |
621 | hopcount, 1); | |
622 | if (rdev) { | |
eb188d0e MP |
623 | /* Add device to the global and bus/net specific list. */ |
624 | list_add_tail(&rdev->net_list, &net->devices); | |
68fe4df5 AB |
625 | rdev->prev = prev; |
626 | if (prev && rio_is_switch(prev)) | |
627 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
628 | } else |
629 | return -1; | |
630 | ||
631 | if (rio_is_switch(rdev)) { | |
de74e00a AB |
632 | int sw_destid; |
633 | int cur_destid; | |
634 | int sw_inport; | |
635 | u16 destid; | |
636 | int port_num; | |
637 | ||
ae05cbd5 | 638 | sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); |
a93192a5 | 639 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
818a04a0 | 640 | port->host_deviceid, sw_inport, 0); |
c70555b0 | 641 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; |
eb188d0e | 642 | |
de74e00a AB |
643 | destid = rio_destid_first(net); |
644 | while (destid != RIO_INVALID_DESTID && destid < next_destid) { | |
645 | if (destid != port->host_deviceid) { | |
646 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, | |
647 | destid, sw_inport, 0); | |
648 | rdev->rswitch->route_table[destid] = sw_inport; | |
649 | } | |
650 | destid = rio_destid_next(net, destid + 1); | |
eb188d0e | 651 | } |
eb188d0e MP |
652 | pr_debug( |
653 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
654 | rio_name(rdev), rdev->vid, rdev->did, |
655 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
c70555b0 | 656 | sw_destid = next_destid; |
68fe4df5 AB |
657 | for (port_num = 0; |
658 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
659 | port_num++) { | |
8d4630dc AB |
660 | if (sw_inport == port_num) { |
661 | rio_enable_rx_tx_port(port, 0, | |
933af4a6 TM |
662 | RIO_ANY_DESTID(port->sys_size), |
663 | hopcount, port_num); | |
e5cabeb3 | 664 | rdev->rswitch->port_ok |= (1 << port_num); |
eb188d0e | 665 | continue; |
e5cabeb3 | 666 | } |
eb188d0e MP |
667 | |
668 | cur_destid = next_destid; | |
669 | ||
670 | if (rio_sport_is_active | |
e0423236 ZW |
671 | (port, RIO_ANY_DESTID(port->sys_size), hopcount, |
672 | port_num)) { | |
eb188d0e MP |
673 | pr_debug( |
674 | "RIO: scanning device on port %d\n", | |
675 | port_num); | |
8d4630dc AB |
676 | rio_enable_rx_tx_port(port, 0, |
677 | RIO_ANY_DESTID(port->sys_size), | |
678 | hopcount, port_num); | |
e5cabeb3 | 679 | rdev->rswitch->port_ok |= (1 << port_num); |
a93192a5 | 680 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
e0423236 | 681 | RIO_ANY_DESTID(port->sys_size), |
818a04a0 | 682 | port_num, 0); |
eb188d0e | 683 | |
68fe4df5 AB |
684 | if (rio_enum_peer(net, port, hopcount + 1, |
685 | rdev, port_num) < 0) | |
eb188d0e MP |
686 | return -1; |
687 | ||
688 | /* Update routing tables */ | |
de74e00a AB |
689 | destid = rio_destid_next(net, cur_destid + 1); |
690 | if (destid != RIO_INVALID_DESTID) { | |
eb188d0e | 691 | for (destid = cur_destid; |
de74e00a AB |
692 | destid < next_destid;) { |
693 | if (destid != port->host_deviceid) { | |
694 | rio_route_add_entry(rdev, | |
eb188d0e MP |
695 | RIO_GLOBAL_TABLE, |
696 | destid, | |
818a04a0 AB |
697 | port_num, |
698 | 0); | |
de74e00a AB |
699 | rdev->rswitch-> |
700 | route_table[destid] = | |
701 | port_num; | |
702 | } | |
703 | destid = rio_destid_next(net, | |
704 | destid + 1); | |
eb188d0e | 705 | } |
eb188d0e | 706 | } |
e5cabeb3 AB |
707 | } else { |
708 | /* If switch supports Error Management, | |
709 | * set PORT_LOCKOUT bit for unused port | |
710 | */ | |
711 | if (rdev->em_efptr) | |
712 | rio_set_port_lockout(rdev, port_num, 1); | |
713 | ||
714 | rdev->rswitch->port_ok &= ~(1 << port_num); | |
eb188d0e MP |
715 | } |
716 | } | |
c70555b0 | 717 | |
e5cabeb3 AB |
718 | /* Direct Port-write messages to the enumeratiing host */ |
719 | if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && | |
720 | (rdev->em_efptr)) { | |
721 | rio_write_config_32(rdev, | |
722 | rdev->em_efptr + RIO_EM_PW_TGT_DEVID, | |
723 | (port->host_deviceid << 16) | | |
724 | (port->sys_size << 15)); | |
725 | } | |
726 | ||
727 | rio_init_em(rdev); | |
728 | ||
c70555b0 | 729 | /* Check for empty switch */ |
de74e00a AB |
730 | if (next_destid == sw_destid) |
731 | next_destid = rio_destid_alloc(net); | |
c70555b0 | 732 | |
a93192a5 | 733 | rdev->destid = sw_destid; |
eb188d0e MP |
734 | } else |
735 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
736 | rio_name(rdev), rdev->vid, rdev->did); | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
741 | /** | |
742 | * rio_enum_complete- Tests if enumeration of a network is complete | |
743 | * @port: Master port to send transaction | |
744 | * | |
a571259f | 745 | * Tests the PGCCSR discovered bit for non-zero value (enumeration |
e5cabeb3 | 746 | * complete flag). Return %1 if enumeration is complete or %0 if |
eb188d0e MP |
747 | * enumeration is incomplete. |
748 | */ | |
749 | static int rio_enum_complete(struct rio_mport *port) | |
750 | { | |
af84ca38 | 751 | u32 regval; |
eb188d0e | 752 | |
af84ca38 AB |
753 | rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, |
754 | ®val); | |
a571259f | 755 | return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0; |
eb188d0e MP |
756 | } |
757 | ||
758 | /** | |
759 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
760 | * @net: RIO network being discovered | |
761 | * @port: Master port to send transactions | |
762 | * @destid: Current destination ID in network | |
763 | * @hopcount: Number of hops into the network | |
9b310acc RD |
764 | * @prev: previous rio_dev |
765 | * @prev_port: previous port number | |
eb188d0e MP |
766 | * |
767 | * Recursively discovers a RIO network. Transactions are sent via the | |
768 | * master port passed in @port. | |
769 | */ | |
305c891e | 770 | static int |
eb188d0e | 771 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, |
17e96205 | 772 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e MP |
773 | { |
774 | u8 port_num, route_port; | |
eb188d0e MP |
775 | struct rio_dev *rdev; |
776 | u16 ndestid; | |
777 | ||
778 | /* Setup new RIO device */ | |
779 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
780 | /* Add device to the global and bus/net specific list. */ | |
781 | list_add_tail(&rdev->net_list, &net->devices); | |
17e96205 AB |
782 | rdev->prev = prev; |
783 | if (prev && rio_is_switch(prev)) | |
784 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
785 | } else |
786 | return -1; | |
787 | ||
788 | if (rio_is_switch(rdev)) { | |
eb188d0e | 789 | /* Associated destid is how we accessed this switch */ |
a93192a5 | 790 | rdev->destid = destid; |
eb188d0e | 791 | |
eb188d0e MP |
792 | pr_debug( |
793 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
794 | rio_name(rdev), rdev->vid, rdev->did, |
795 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
796 | for (port_num = 0; | |
797 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
798 | port_num++) { | |
ae05cbd5 | 799 | if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) |
eb188d0e MP |
800 | continue; |
801 | ||
802 | if (rio_sport_is_active | |
803 | (port, destid, hopcount, port_num)) { | |
804 | pr_debug( | |
805 | "RIO: scanning device on port %d\n", | |
806 | port_num); | |
818a04a0 AB |
807 | |
808 | rio_lock_device(port, destid, hopcount, 1000); | |
809 | ||
e0423236 ZW |
810 | for (ndestid = 0; |
811 | ndestid < RIO_ANY_DESTID(port->sys_size); | |
eb188d0e | 812 | ndestid++) { |
a93192a5 | 813 | rio_route_get_entry(rdev, |
eb188d0e MP |
814 | RIO_GLOBAL_TABLE, |
815 | ndestid, | |
818a04a0 | 816 | &route_port, 0); |
eb188d0e MP |
817 | if (route_port == port_num) |
818 | break; | |
819 | } | |
820 | ||
af84ca38 AB |
821 | if (ndestid == RIO_ANY_DESTID(port->sys_size)) |
822 | continue; | |
818a04a0 | 823 | rio_unlock_device(port, destid, hopcount); |
17e96205 AB |
824 | if (rio_disc_peer(net, port, ndestid, |
825 | hopcount + 1, rdev, port_num) < 0) | |
eb188d0e MP |
826 | return -1; |
827 | } | |
828 | } | |
829 | } else | |
830 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
831 | rio_name(rdev), rdev->vid, rdev->did); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | /** | |
837 | * rio_mport_is_active- Tests if master port link is active | |
838 | * @port: Master port to test | |
839 | * | |
840 | * Reads the port error status CSR for the master port to | |
841 | * determine if the port has an active link. Returns | |
e5cabeb3 | 842 | * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active |
eb188d0e MP |
843 | * or %0 if it is inactive. |
844 | */ | |
845 | static int rio_mport_is_active(struct rio_mport *port) | |
846 | { | |
847 | u32 result = 0; | |
848 | u32 ext_ftr_ptr; | |
849 | int *entry = rio_mport_phys_table; | |
850 | ||
851 | do { | |
852 | if ((ext_ftr_ptr = | |
853 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
854 | break; | |
855 | } while (*++entry >= 0); | |
856 | ||
857 | if (ext_ftr_ptr) | |
858 | rio_local_read_config_32(port, | |
859 | ext_ftr_ptr + | |
860 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
861 | &result); | |
862 | ||
e5cabeb3 | 863 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
864 | } |
865 | ||
866 | /** | |
867 | * rio_alloc_net- Allocate and configure a new RIO network | |
868 | * @port: Master port associated with the RIO network | |
de74e00a AB |
869 | * @do_enum: Enumeration/Discovery mode flag |
870 | * @start: logical minimal start id for new net | |
eb188d0e MP |
871 | * |
872 | * Allocates a RIO network structure, initializes per-network | |
873 | * list heads, and adds the associated master port to the | |
874 | * network list of associated master ports. Returns a | |
875 | * RIO network pointer on success or %NULL on failure. | |
876 | */ | |
305c891e | 877 | static struct rio_net *rio_alloc_net(struct rio_mport *port, |
de74e00a | 878 | int do_enum, u16 start) |
eb188d0e MP |
879 | { |
880 | struct rio_net *net; | |
881 | ||
dd00cc48 | 882 | net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); |
de74e00a | 883 | if (net && do_enum) { |
4ed134be AB |
884 | net->destid_table.table = kcalloc( |
885 | BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)), | |
de74e00a AB |
886 | sizeof(long), |
887 | GFP_KERNEL); | |
888 | ||
889 | if (net->destid_table.table == NULL) { | |
890 | pr_err("RIO: failed to allocate destID table\n"); | |
891 | kfree(net); | |
892 | net = NULL; | |
893 | } else { | |
894 | net->destid_table.start = start; | |
de74e00a AB |
895 | net->destid_table.max = |
896 | RIO_MAX_ROUTE_ENTRIES(port->sys_size); | |
897 | spin_lock_init(&net->destid_table.lock); | |
898 | } | |
899 | } | |
900 | ||
eb188d0e | 901 | if (net) { |
eb188d0e MP |
902 | INIT_LIST_HEAD(&net->node); |
903 | INIT_LIST_HEAD(&net->devices); | |
a7071efc | 904 | INIT_LIST_HEAD(&net->switches); |
eb188d0e MP |
905 | INIT_LIST_HEAD(&net->mports); |
906 | list_add_tail(&port->nnode, &net->mports); | |
907 | net->hport = port; | |
005842ef | 908 | net->id = port->id; |
eb188d0e MP |
909 | } |
910 | return net; | |
911 | } | |
912 | ||
c70555b0 AB |
913 | /** |
914 | * rio_update_route_tables- Updates route tables in switches | |
a7071efc | 915 | * @net: RIO network to run update on |
c70555b0 AB |
916 | * |
917 | * For each enumerated device, ensure that each switch in a system | |
918 | * has correct routing entries. Add routes for devices that where | |
919 | * unknown dirung the first enumeration pass through the switch. | |
920 | */ | |
a7071efc | 921 | static void rio_update_route_tables(struct rio_net *net) |
c70555b0 | 922 | { |
ded05782 | 923 | struct rio_dev *rdev, *swrdev; |
c70555b0 AB |
924 | struct rio_switch *rswitch; |
925 | u8 sport; | |
926 | u16 destid; | |
927 | ||
a7071efc | 928 | list_for_each_entry(rdev, &net->devices, net_list) { |
c70555b0 | 929 | |
a93192a5 | 930 | destid = rdev->destid; |
c70555b0 | 931 | |
a7071efc | 932 | list_for_each_entry(rswitch, &net->switches, node) { |
c70555b0 AB |
933 | |
934 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
935 | continue; | |
936 | ||
937 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
ded05782 AB |
938 | swrdev = sw_to_rio_dev(rswitch); |
939 | ||
07590ff0 | 940 | /* Skip if destid ends in empty switch*/ |
ded05782 | 941 | if (swrdev->destid == destid) |
07590ff0 | 942 | continue; |
c70555b0 | 943 | |
ded05782 | 944 | sport = RIO_GET_PORT_NUM(swrdev->swpinfo); |
c70555b0 | 945 | |
2ec3ba69 AB |
946 | rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE, |
947 | destid, sport, 0); | |
948 | rswitch->route_table[destid] = sport; | |
c70555b0 AB |
949 | } |
950 | } | |
951 | } | |
952 | } | |
953 | ||
e5cabeb3 AB |
954 | /** |
955 | * rio_init_em - Initializes RIO Error Management (for switches) | |
97ef6f74 | 956 | * @rdev: RIO device |
e5cabeb3 AB |
957 | * |
958 | * For each enumerated switch, call device-specific error management | |
959 | * initialization routine (if supplied by the switch driver). | |
960 | */ | |
961 | static void rio_init_em(struct rio_dev *rdev) | |
962 | { | |
963 | if (rio_is_switch(rdev) && (rdev->em_efptr) && | |
2ec3ba69 AB |
964 | rdev->rswitch->ops && rdev->rswitch->ops->em_init) { |
965 | rdev->rswitch->ops->em_init(rdev); | |
e5cabeb3 AB |
966 | } |
967 | } | |
968 | ||
969 | /** | |
970 | * rio_pw_enable - Enables/disables port-write handling by a master port | |
971 | * @port: Master port associated with port-write handling | |
972 | * @enable: 1=enable, 0=disable | |
973 | */ | |
974 | static void rio_pw_enable(struct rio_mport *port, int enable) | |
975 | { | |
976 | if (port->ops->pwenable) | |
977 | port->ops->pwenable(port, enable); | |
978 | } | |
979 | ||
eb188d0e MP |
980 | /** |
981 | * rio_enum_mport- Start enumeration through a master port | |
982 | * @mport: Master port to send transactions | |
bc8fcfea | 983 | * @flags: Enumeration control flags |
eb188d0e MP |
984 | * |
985 | * Starts the enumeration process. If somebody has enumerated our | |
986 | * master port device, then give up. If not and we have an active | |
987 | * link, then start recursive peer enumeration. Returns %0 if | |
988 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
989 | */ | |
36f0efbb | 990 | static int rio_enum_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
991 | { |
992 | struct rio_net *net = NULL; | |
993 | int rc = 0; | |
994 | ||
995 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
996 | mport->name); | |
bc8fcfea AB |
997 | |
998 | /* | |
999 | * To avoid multiple start requests (repeat enumeration is not supported | |
1000 | * by this method) check if enumeration/discovery was performed for this | |
1001 | * mport: if mport was added into the list of mports for a net exit | |
1002 | * with error. | |
1003 | */ | |
1004 | if (mport->nnode.next || mport->nnode.prev) | |
1005 | return -EBUSY; | |
1006 | ||
eb188d0e MP |
1007 | /* If somebody else enumerated our master port device, bail. */ |
1008 | if (rio_enum_host(mport) < 0) { | |
1009 | printk(KERN_INFO | |
1010 | "RIO: master port %d device has been enumerated by a remote host\n", | |
1011 | mport->id); | |
1012 | rc = -EBUSY; | |
1013 | goto out; | |
1014 | } | |
1015 | ||
1016 | /* If master port has an active link, allocate net and enum peers */ | |
1017 | if (rio_mport_is_active(mport)) { | |
de74e00a AB |
1018 | net = rio_alloc_net(mport, 1, 0); |
1019 | if (!net) { | |
eb188d0e MP |
1020 | printk(KERN_ERR "RIO: failed to allocate new net\n"); |
1021 | rc = -ENOMEM; | |
1022 | goto out; | |
1023 | } | |
933af4a6 | 1024 | |
de74e00a AB |
1025 | /* reserve mport destID in new net */ |
1026 | rio_destid_reserve(net, mport->host_deviceid); | |
1027 | ||
933af4a6 TM |
1028 | /* Enable Input Output Port (transmitter reviever) */ |
1029 | rio_enable_rx_tx_port(mport, 1, 0, 0, 0); | |
1030 | ||
af84ca38 AB |
1031 | /* Set component tag for host */ |
1032 | rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, | |
1033 | next_comptag++); | |
1034 | ||
de74e00a AB |
1035 | next_destid = rio_destid_alloc(net); |
1036 | ||
68fe4df5 | 1037 | if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { |
eb188d0e MP |
1038 | /* A higher priority host won enumeration, bail. */ |
1039 | printk(KERN_INFO | |
1040 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
1041 | mport->id); | |
a7071efc | 1042 | rio_clear_locks(net); |
eb188d0e MP |
1043 | rc = -EBUSY; |
1044 | goto out; | |
1045 | } | |
de74e00a AB |
1046 | /* free the last allocated destID (unused) */ |
1047 | rio_destid_free(net, next_destid); | |
a7071efc AB |
1048 | rio_update_route_tables(net); |
1049 | rio_clear_locks(net); | |
e5cabeb3 | 1050 | rio_pw_enable(mport, 1); |
eb188d0e MP |
1051 | } else { |
1052 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
1053 | mport->id); | |
1054 | rc = -EINVAL; | |
1055 | } | |
1056 | ||
1057 | out: | |
1058 | return rc; | |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * rio_build_route_tables- Generate route tables from switch route entries | |
a7071efc | 1063 | * @net: RIO network to run route tables scan on |
eb188d0e MP |
1064 | * |
1065 | * For each switch device, generate a route table by copying existing | |
1066 | * route entries from the switch. | |
1067 | */ | |
a7071efc | 1068 | static void rio_build_route_tables(struct rio_net *net) |
eb188d0e | 1069 | { |
a7071efc | 1070 | struct rio_switch *rswitch; |
eb188d0e MP |
1071 | struct rio_dev *rdev; |
1072 | int i; | |
1073 | u8 sport; | |
1074 | ||
a7071efc AB |
1075 | list_for_each_entry(rswitch, &net->switches, node) { |
1076 | rdev = sw_to_rio_dev(rswitch); | |
818a04a0 | 1077 | |
a7071efc AB |
1078 | rio_lock_device(net->hport, rdev->destid, |
1079 | rdev->hopcount, 1000); | |
1080 | for (i = 0; | |
1081 | i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size); | |
1082 | i++) { | |
1083 | if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE, | |
1084 | i, &sport, 0) < 0) | |
1085 | continue; | |
1086 | rswitch->route_table[i] = sport; | |
eb188d0e | 1087 | } |
a7071efc AB |
1088 | |
1089 | rio_unlock_device(net->hport, rdev->destid, rdev->hopcount); | |
1090 | } | |
eb188d0e MP |
1091 | } |
1092 | ||
eb188d0e MP |
1093 | /** |
1094 | * rio_disc_mport- Start discovery through a master port | |
1095 | * @mport: Master port to send transactions | |
bc8fcfea | 1096 | * @flags: discovery control flags |
eb188d0e MP |
1097 | * |
1098 | * Starts the discovery process. If we have an active link, | |
bc8fcfea AB |
1099 | * then wait for the signal that enumeration is complete (if wait |
1100 | * is allowed). | |
eb188d0e MP |
1101 | * When enumeration completion is signaled, start recursive |
1102 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
1103 | * on failure. | |
1104 | */ | |
36f0efbb | 1105 | static int rio_disc_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
1106 | { |
1107 | struct rio_net *net = NULL; | |
fa3dbaa0 | 1108 | unsigned long to_end; |
eb188d0e MP |
1109 | |
1110 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
1111 | mport->name); | |
1112 | ||
1113 | /* If master port has an active link, allocate net and discover peers */ | |
1114 | if (rio_mport_is_active(mport)) { | |
bc8fcfea AB |
1115 | if (rio_enum_complete(mport)) |
1116 | goto enum_done; | |
1117 | else if (flags & RIO_SCAN_ENUM_NO_WAIT) | |
1118 | return -EAGAIN; | |
1119 | ||
fa3dbaa0 | 1120 | pr_debug("RIO: wait for enumeration to complete...\n"); |
eb188d0e | 1121 | |
fa3dbaa0 AB |
1122 | to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; |
1123 | while (time_before(jiffies, to_end)) { | |
1124 | if (rio_enum_complete(mport)) | |
1125 | goto enum_done; | |
f4c9c0e8 | 1126 | msleep(10); |
eb188d0e | 1127 | } |
eb188d0e | 1128 | |
fa3dbaa0 AB |
1129 | pr_debug("RIO: discovery timeout on mport %d %s\n", |
1130 | mport->id, mport->name); | |
1131 | goto bail; | |
1132 | enum_done: | |
1133 | pr_debug("RIO: ... enumeration done\n"); | |
1134 | ||
de74e00a | 1135 | net = rio_alloc_net(mport, 0, 0); |
fa3dbaa0 AB |
1136 | if (!net) { |
1137 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
1138 | goto bail; | |
1139 | } | |
818a04a0 AB |
1140 | |
1141 | /* Read DestID assigned by enumerator */ | |
1142 | rio_local_read_config_32(mport, RIO_DID_CSR, | |
1143 | &mport->host_deviceid); | |
1144 | mport->host_deviceid = RIO_GET_DID(mport->sys_size, | |
1145 | mport->host_deviceid); | |
1146 | ||
e0423236 | 1147 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), |
17e96205 | 1148 | 0, NULL, 0) < 0) { |
eb188d0e MP |
1149 | printk(KERN_INFO |
1150 | "RIO: master port %d device has failed discovery\n", | |
1151 | mport->id); | |
1152 | goto bail; | |
1153 | } | |
1154 | ||
a7071efc | 1155 | rio_build_route_tables(net); |
eb188d0e MP |
1156 | } |
1157 | ||
1158 | return 0; | |
fa3dbaa0 | 1159 | bail: |
eb188d0e MP |
1160 | return -EBUSY; |
1161 | } | |
a11650e1 AB |
1162 | |
1163 | static struct rio_scan rio_scan_ops = { | |
9edbc30b | 1164 | .owner = THIS_MODULE, |
a11650e1 AB |
1165 | .enumerate = rio_enum_mport, |
1166 | .discover = rio_disc_mport, | |
1167 | }; | |
1168 | ||
1169 | static bool scan; | |
1170 | module_param(scan, bool, 0); | |
1171 | MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery " | |
1172 | "(default = 0)"); | |
1173 | ||
1174 | /** | |
1175 | * rio_basic_attach: | |
1176 | * | |
1177 | * When this enumeration/discovery method is loaded as a module this function | |
1178 | * registers its specific enumeration and discover routines for all available | |
1179 | * RapidIO mport devices. The "scan" command line parameter controls ability of | |
1180 | * the module to start RapidIO enumeration/discovery automatically. | |
1181 | * | |
1182 | * Returns 0 for success or -EIO if unable to register itself. | |
1183 | * | |
1184 | * This enumeration/discovery method cannot be unloaded and therefore does not | |
1185 | * provide a matching cleanup_module routine. | |
1186 | */ | |
1187 | ||
1188 | static int __init rio_basic_attach(void) | |
1189 | { | |
1190 | if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops)) | |
1191 | return -EIO; | |
1192 | if (scan) | |
1193 | rio_init_mports(); | |
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | late_initcall(rio_basic_attach); | |
1198 | ||
1199 | MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery"); | |
1200 | MODULE_LICENSE("GPL"); |