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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++; | |
558bda65 AB |
409 | } else { |
410 | rio_mport_read_config_32(port, destid, hopcount, | |
411 | RIO_COMPONENT_TAG_CSR, | |
412 | &rdev->comp_tag); | |
af84ca38 AB |
413 | } |
414 | ||
c70555b0 AB |
415 | if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { |
416 | if (do_enum) { | |
417 | rio_set_device_id(port, destid, hopcount, next_destid); | |
de74e00a AB |
418 | rdev->destid = next_destid; |
419 | next_destid = rio_destid_alloc(net); | |
c70555b0 AB |
420 | } else |
421 | rdev->destid = rio_get_device_id(port, destid, hopcount); | |
a93192a5 AB |
422 | |
423 | rdev->hopcount = 0xff; | |
424 | } else { | |
425 | /* Switch device has an associated destID which | |
426 | * will be adjusted later | |
427 | */ | |
428 | rdev->destid = destid; | |
429 | rdev->hopcount = hopcount; | |
430 | } | |
eb188d0e MP |
431 | |
432 | /* If a PE has both switch and other functions, show it as a switch */ | |
433 | if (rio_is_switch(rdev)) { | |
ded05782 | 434 | rswitch = rdev->rswitch; |
558bda65 | 435 | rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID; |
e5cabeb3 | 436 | rswitch->port_ok = 0; |
e0423236 ZW |
437 | rswitch->route_table = kzalloc(sizeof(u8)* |
438 | RIO_MAX_ROUTE_ENTRIES(port->sys_size), | |
439 | GFP_KERNEL); | |
5f28c520 YL |
440 | if (!rswitch->route_table) |
441 | goto cleanup; | |
eb188d0e | 442 | /* Initialize switch route table */ |
e0423236 ZW |
443 | for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); |
444 | rdid++) | |
eb188d0e | 445 | rswitch->route_table[rdid] = RIO_INVALID_ROUTE; |
b53c7583 | 446 | dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, |
ded05782 | 447 | rswitch->switchid); |
058f88d6 | 448 | rio_switch_init(rdev, do_enum); |
eb188d0e | 449 | |
ded05782 AB |
450 | if (do_enum && rswitch->clr_table) |
451 | rswitch->clr_table(port, destid, hopcount, | |
452 | RIO_GLOBAL_TABLE); | |
07590ff0 | 453 | |
a7071efc | 454 | list_add_tail(&rswitch->node, &net->switches); |
eb188d0e | 455 | |
933af4a6 TM |
456 | } else { |
457 | if (do_enum) | |
458 | /*Enable Input Output Port (transmitter reviever)*/ | |
459 | rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); | |
460 | ||
b53c7583 KS |
461 | dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, |
462 | rdev->destid); | |
933af4a6 | 463 | } |
eb188d0e | 464 | |
a11650e1 | 465 | rio_attach_device(rdev); |
eb188d0e MP |
466 | |
467 | device_initialize(&rdev->dev); | |
468 | rdev->dev.release = rio_release_dev; | |
469 | rio_dev_get(rdev); | |
470 | ||
284901a9 | 471 | rdev->dma_mask = DMA_BIT_MASK(32); |
fa78cc51 | 472 | rdev->dev.dma_mask = &rdev->dma_mask; |
284901a9 | 473 | rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
eb188d0e | 474 | |
284fb68d | 475 | if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) |
eb188d0e MP |
476 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], |
477 | 0, 0xffff); | |
478 | ||
5f28c520 YL |
479 | ret = rio_add_device(rdev); |
480 | if (ret) | |
481 | goto cleanup; | |
eb188d0e | 482 | |
eb188d0e | 483 | return rdev; |
5f28c520 YL |
484 | |
485 | cleanup: | |
166c050b | 486 | if (rswitch) |
5f28c520 | 487 | kfree(rswitch->route_table); |
ded05782 | 488 | |
5f28c520 YL |
489 | kfree(rdev); |
490 | return NULL; | |
eb188d0e MP |
491 | } |
492 | ||
493 | /** | |
494 | * rio_sport_is_active- Tests if a switch port has an active connection. | |
495 | * @port: Master port to send transaction | |
496 | * @destid: Associated destination ID for switch | |
497 | * @hopcount: Hopcount to reach switch | |
498 | * @sport: Switch port number | |
499 | * | |
500 | * Reads the port error status CSR for a particular switch port to | |
501 | * determine if the port has an active link. Returns | |
e5cabeb3 | 502 | * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is |
eb188d0e MP |
503 | * inactive. |
504 | */ | |
505 | static int | |
506 | rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) | |
507 | { | |
e5cabeb3 | 508 | u32 result = 0; |
eb188d0e MP |
509 | u32 ext_ftr_ptr; |
510 | ||
e5cabeb3 | 511 | ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0); |
eb188d0e | 512 | |
e5cabeb3 AB |
513 | while (ext_ftr_ptr) { |
514 | rio_mport_read_config_32(port, destid, hopcount, | |
515 | ext_ftr_ptr, &result); | |
516 | result = RIO_GET_BLOCK_ID(result); | |
517 | if ((result == RIO_EFB_SER_EP_FREE_ID) || | |
518 | (result == RIO_EFB_SER_EP_FREE_ID_V13P) || | |
519 | (result == RIO_EFB_SER_EP_FREC_ID)) | |
eb188d0e | 520 | break; |
e5cabeb3 AB |
521 | |
522 | ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, | |
523 | ext_ftr_ptr); | |
524 | } | |
eb188d0e MP |
525 | |
526 | if (ext_ftr_ptr) | |
527 | rio_mport_read_config_32(port, destid, hopcount, | |
528 | ext_ftr_ptr + | |
529 | RIO_PORT_N_ERR_STS_CSR(sport), | |
530 | &result); | |
531 | ||
e5cabeb3 | 532 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
533 | } |
534 | ||
818a04a0 AB |
535 | /** |
536 | * rio_lock_device - Acquires host device lock for specified device | |
537 | * @port: Master port to send transaction | |
538 | * @destid: Destination ID for device/switch | |
539 | * @hopcount: Hopcount to reach switch | |
540 | * @wait_ms: Max wait time in msec (0 = no timeout) | |
541 | * | |
542 | * Attepts to acquire host device lock for specified device | |
543 | * Returns 0 if device lock acquired or EINVAL if timeout expires. | |
544 | */ | |
545 | static int | |
546 | rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms) | |
547 | { | |
548 | u32 result; | |
549 | int tcnt = 0; | |
550 | ||
551 | /* Attempt to acquire device lock */ | |
552 | rio_mport_write_config_32(port, destid, hopcount, | |
553 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); | |
554 | rio_mport_read_config_32(port, destid, hopcount, | |
555 | RIO_HOST_DID_LOCK_CSR, &result); | |
556 | ||
557 | while (result != port->host_deviceid) { | |
558 | if (wait_ms != 0 && tcnt == wait_ms) { | |
559 | pr_debug("RIO: timeout when locking device %x:%x\n", | |
560 | destid, hopcount); | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
564 | /* Delay a bit */ | |
565 | mdelay(1); | |
566 | tcnt++; | |
567 | /* Try to acquire device lock again */ | |
568 | rio_mport_write_config_32(port, destid, | |
569 | hopcount, | |
570 | RIO_HOST_DID_LOCK_CSR, | |
571 | port->host_deviceid); | |
572 | rio_mport_read_config_32(port, destid, | |
573 | hopcount, | |
574 | RIO_HOST_DID_LOCK_CSR, &result); | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | /** | |
581 | * rio_unlock_device - Releases host device lock for specified device | |
582 | * @port: Master port to send transaction | |
583 | * @destid: Destination ID for device/switch | |
584 | * @hopcount: Hopcount to reach switch | |
585 | * | |
586 | * Returns 0 if device lock released or EINVAL if fails. | |
587 | */ | |
588 | static int | |
589 | rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount) | |
590 | { | |
591 | u32 result; | |
592 | ||
593 | /* Release device lock */ | |
594 | rio_mport_write_config_32(port, destid, | |
595 | hopcount, | |
596 | RIO_HOST_DID_LOCK_CSR, | |
597 | port->host_deviceid); | |
598 | rio_mport_read_config_32(port, destid, hopcount, | |
599 | RIO_HOST_DID_LOCK_CSR, &result); | |
600 | if ((result & 0xffff) != 0xffff) { | |
601 | pr_debug("RIO: badness when releasing device lock %x:%x\n", | |
602 | destid, hopcount); | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
eb188d0e MP |
609 | /** |
610 | * rio_route_add_entry- Add a route entry to a switch routing table | |
a93192a5 | 611 | * @rdev: RIO device |
eb188d0e MP |
612 | * @table: Routing table ID |
613 | * @route_destid: Destination ID to be routed | |
614 | * @route_port: Port number to be routed | |
818a04a0 | 615 | * @lock: lock switch device flag |
eb188d0e MP |
616 | * |
617 | * Calls the switch specific add_entry() method to add a route entry | |
618 | * on a switch. The route table can be specified using the @table | |
619 | * argument if a switch has per port routing tables or the normal | |
620 | * use is to specific all tables (or the global table) by passing | |
621 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
622 | * on failure. | |
623 | */ | |
818a04a0 | 624 | static int |
a93192a5 | 625 | rio_route_add_entry(struct rio_dev *rdev, |
818a04a0 | 626 | u16 table, u16 route_destid, u8 route_port, int lock) |
eb188d0e | 627 | { |
818a04a0 AB |
628 | int rc; |
629 | ||
630 | if (lock) { | |
a93192a5 AB |
631 | rc = rio_lock_device(rdev->net->hport, rdev->destid, |
632 | rdev->hopcount, 1000); | |
818a04a0 AB |
633 | if (rc) |
634 | return rc; | |
635 | } | |
636 | ||
a93192a5 AB |
637 | rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid, |
638 | rdev->hopcount, table, | |
639 | route_destid, route_port); | |
818a04a0 | 640 | if (lock) |
a93192a5 AB |
641 | rio_unlock_device(rdev->net->hport, rdev->destid, |
642 | rdev->hopcount); | |
818a04a0 AB |
643 | |
644 | return rc; | |
eb188d0e MP |
645 | } |
646 | ||
647 | /** | |
648 | * rio_route_get_entry- Read a route entry in a switch routing table | |
a93192a5 | 649 | * @rdev: RIO device |
eb188d0e MP |
650 | * @table: Routing table ID |
651 | * @route_destid: Destination ID to be routed | |
652 | * @route_port: Pointer to read port number into | |
818a04a0 | 653 | * @lock: lock switch device flag |
eb188d0e MP |
654 | * |
655 | * Calls the switch specific get_entry() method to read a route entry | |
656 | * in a switch. The route table can be specified using the @table | |
657 | * argument if a switch has per port routing tables or the normal | |
658 | * use is to specific all tables (or the global table) by passing | |
659 | * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL | |
660 | * on failure. | |
661 | */ | |
662 | static int | |
a93192a5 | 663 | rio_route_get_entry(struct rio_dev *rdev, u16 table, |
818a04a0 | 664 | u16 route_destid, u8 *route_port, int lock) |
eb188d0e | 665 | { |
818a04a0 AB |
666 | int rc; |
667 | ||
668 | if (lock) { | |
a93192a5 AB |
669 | rc = rio_lock_device(rdev->net->hport, rdev->destid, |
670 | rdev->hopcount, 1000); | |
818a04a0 AB |
671 | if (rc) |
672 | return rc; | |
673 | } | |
674 | ||
a93192a5 AB |
675 | rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid, |
676 | rdev->hopcount, table, | |
677 | route_destid, route_port); | |
818a04a0 | 678 | if (lock) |
a93192a5 AB |
679 | rio_unlock_device(rdev->net->hport, rdev->destid, |
680 | rdev->hopcount); | |
818a04a0 AB |
681 | |
682 | return rc; | |
eb188d0e MP |
683 | } |
684 | ||
685 | /** | |
686 | * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device | |
687 | * @port: Master port to send transaction | |
688 | * @hopcount: Number of hops to the device | |
689 | * | |
690 | * Used during enumeration to read the Host Device ID Lock CSR on a | |
691 | * RIO device. Returns the value of the lock register. | |
692 | */ | |
693 | static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) | |
694 | { | |
695 | u32 result; | |
696 | ||
e0423236 | 697 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, |
eb188d0e MP |
698 | RIO_HOST_DID_LOCK_CSR, &result); |
699 | ||
700 | return (u16) (result & 0xffff); | |
701 | } | |
702 | ||
eb188d0e MP |
703 | /** |
704 | * rio_enum_peer- Recursively enumerate a RIO network through a master port | |
705 | * @net: RIO network being enumerated | |
706 | * @port: Master port to send transactions | |
707 | * @hopcount: Number of hops into the network | |
68fe4df5 AB |
708 | * @prev: Previous RIO device connected to the enumerated one |
709 | * @prev_port: Port on previous RIO device | |
eb188d0e MP |
710 | * |
711 | * Recursively enumerates a RIO network. Transactions are sent via the | |
712 | * master port passed in @port. | |
713 | */ | |
305c891e | 714 | static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, |
68fe4df5 | 715 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e | 716 | { |
eb188d0e | 717 | struct rio_dev *rdev; |
af84ca38 | 718 | u32 regval; |
eb188d0e MP |
719 | int tmp; |
720 | ||
e274e0ed AB |
721 | if (rio_mport_chk_dev_access(port, |
722 | RIO_ANY_DESTID(port->sys_size), hopcount)) { | |
723 | pr_debug("RIO: device access check failed\n"); | |
724 | return -1; | |
725 | } | |
726 | ||
eb188d0e MP |
727 | if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { |
728 | pr_debug("RIO: PE already discovered by this host\n"); | |
729 | /* | |
730 | * Already discovered by this host. Add it as another | |
af84ca38 | 731 | * link to the existing device. |
eb188d0e | 732 | */ |
af84ca38 AB |
733 | rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), |
734 | hopcount, RIO_COMPONENT_TAG_CSR, ®val); | |
735 | ||
736 | if (regval) { | |
737 | rdev = rio_get_comptag((regval & 0xffff), NULL); | |
738 | ||
739 | if (rdev && prev && rio_is_switch(prev)) { | |
740 | pr_debug("RIO: redundant path to %s\n", | |
741 | rio_name(rdev)); | |
742 | prev->rswitch->nextdev[prev_port] = rdev; | |
743 | } | |
744 | } | |
745 | ||
eb188d0e MP |
746 | return 0; |
747 | } | |
748 | ||
749 | /* Attempt to acquire device lock */ | |
e0423236 ZW |
750 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
751 | hopcount, | |
eb188d0e MP |
752 | RIO_HOST_DID_LOCK_CSR, port->host_deviceid); |
753 | while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) | |
754 | < port->host_deviceid) { | |
755 | /* Delay a bit */ | |
756 | mdelay(1); | |
757 | /* Attempt to acquire device lock again */ | |
e0423236 ZW |
758 | rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), |
759 | hopcount, | |
eb188d0e MP |
760 | RIO_HOST_DID_LOCK_CSR, |
761 | port->host_deviceid); | |
762 | } | |
763 | ||
764 | if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { | |
765 | pr_debug( | |
766 | "RIO: PE locked by a higher priority host...retreating\n"); | |
767 | return -1; | |
768 | } | |
769 | ||
770 | /* Setup new RIO device */ | |
e0423236 ZW |
771 | rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), |
772 | hopcount, 1); | |
773 | if (rdev) { | |
eb188d0e MP |
774 | /* Add device to the global and bus/net specific list. */ |
775 | list_add_tail(&rdev->net_list, &net->devices); | |
68fe4df5 AB |
776 | rdev->prev = prev; |
777 | if (prev && rio_is_switch(prev)) | |
778 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
779 | } else |
780 | return -1; | |
781 | ||
782 | if (rio_is_switch(rdev)) { | |
de74e00a AB |
783 | int sw_destid; |
784 | int cur_destid; | |
785 | int sw_inport; | |
786 | u16 destid; | |
787 | int port_num; | |
788 | ||
ae05cbd5 | 789 | sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); |
a93192a5 | 790 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
818a04a0 | 791 | port->host_deviceid, sw_inport, 0); |
c70555b0 | 792 | rdev->rswitch->route_table[port->host_deviceid] = sw_inport; |
eb188d0e | 793 | |
de74e00a AB |
794 | destid = rio_destid_first(net); |
795 | while (destid != RIO_INVALID_DESTID && destid < next_destid) { | |
796 | if (destid != port->host_deviceid) { | |
797 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, | |
798 | destid, sw_inport, 0); | |
799 | rdev->rswitch->route_table[destid] = sw_inport; | |
800 | } | |
801 | destid = rio_destid_next(net, destid + 1); | |
eb188d0e | 802 | } |
eb188d0e MP |
803 | pr_debug( |
804 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
805 | rio_name(rdev), rdev->vid, rdev->did, |
806 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
c70555b0 | 807 | sw_destid = next_destid; |
68fe4df5 AB |
808 | for (port_num = 0; |
809 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
810 | port_num++) { | |
8d4630dc AB |
811 | if (sw_inport == port_num) { |
812 | rio_enable_rx_tx_port(port, 0, | |
933af4a6 TM |
813 | RIO_ANY_DESTID(port->sys_size), |
814 | hopcount, port_num); | |
e5cabeb3 | 815 | rdev->rswitch->port_ok |= (1 << port_num); |
eb188d0e | 816 | continue; |
e5cabeb3 | 817 | } |
eb188d0e MP |
818 | |
819 | cur_destid = next_destid; | |
820 | ||
821 | if (rio_sport_is_active | |
e0423236 ZW |
822 | (port, RIO_ANY_DESTID(port->sys_size), hopcount, |
823 | port_num)) { | |
eb188d0e MP |
824 | pr_debug( |
825 | "RIO: scanning device on port %d\n", | |
826 | port_num); | |
8d4630dc AB |
827 | rio_enable_rx_tx_port(port, 0, |
828 | RIO_ANY_DESTID(port->sys_size), | |
829 | hopcount, port_num); | |
e5cabeb3 | 830 | rdev->rswitch->port_ok |= (1 << port_num); |
a93192a5 | 831 | rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, |
e0423236 | 832 | RIO_ANY_DESTID(port->sys_size), |
818a04a0 | 833 | port_num, 0); |
eb188d0e | 834 | |
68fe4df5 AB |
835 | if (rio_enum_peer(net, port, hopcount + 1, |
836 | rdev, port_num) < 0) | |
eb188d0e MP |
837 | return -1; |
838 | ||
839 | /* Update routing tables */ | |
de74e00a AB |
840 | destid = rio_destid_next(net, cur_destid + 1); |
841 | if (destid != RIO_INVALID_DESTID) { | |
eb188d0e | 842 | for (destid = cur_destid; |
de74e00a AB |
843 | destid < next_destid;) { |
844 | if (destid != port->host_deviceid) { | |
845 | rio_route_add_entry(rdev, | |
eb188d0e MP |
846 | RIO_GLOBAL_TABLE, |
847 | destid, | |
818a04a0 AB |
848 | port_num, |
849 | 0); | |
de74e00a AB |
850 | rdev->rswitch-> |
851 | route_table[destid] = | |
852 | port_num; | |
853 | } | |
854 | destid = rio_destid_next(net, | |
855 | destid + 1); | |
eb188d0e | 856 | } |
eb188d0e | 857 | } |
e5cabeb3 AB |
858 | } else { |
859 | /* If switch supports Error Management, | |
860 | * set PORT_LOCKOUT bit for unused port | |
861 | */ | |
862 | if (rdev->em_efptr) | |
863 | rio_set_port_lockout(rdev, port_num, 1); | |
864 | ||
865 | rdev->rswitch->port_ok &= ~(1 << port_num); | |
eb188d0e MP |
866 | } |
867 | } | |
c70555b0 | 868 | |
e5cabeb3 AB |
869 | /* Direct Port-write messages to the enumeratiing host */ |
870 | if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && | |
871 | (rdev->em_efptr)) { | |
872 | rio_write_config_32(rdev, | |
873 | rdev->em_efptr + RIO_EM_PW_TGT_DEVID, | |
874 | (port->host_deviceid << 16) | | |
875 | (port->sys_size << 15)); | |
876 | } | |
877 | ||
878 | rio_init_em(rdev); | |
879 | ||
c70555b0 | 880 | /* Check for empty switch */ |
de74e00a AB |
881 | if (next_destid == sw_destid) |
882 | next_destid = rio_destid_alloc(net); | |
c70555b0 | 883 | |
a93192a5 | 884 | rdev->destid = sw_destid; |
eb188d0e MP |
885 | } else |
886 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
887 | rio_name(rdev), rdev->vid, rdev->did); | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
892 | /** | |
893 | * rio_enum_complete- Tests if enumeration of a network is complete | |
894 | * @port: Master port to send transaction | |
895 | * | |
a571259f | 896 | * Tests the PGCCSR discovered bit for non-zero value (enumeration |
e5cabeb3 | 897 | * complete flag). Return %1 if enumeration is complete or %0 if |
eb188d0e MP |
898 | * enumeration is incomplete. |
899 | */ | |
900 | static int rio_enum_complete(struct rio_mport *port) | |
901 | { | |
af84ca38 | 902 | u32 regval; |
eb188d0e | 903 | |
af84ca38 AB |
904 | rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, |
905 | ®val); | |
a571259f | 906 | return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0; |
eb188d0e MP |
907 | } |
908 | ||
909 | /** | |
910 | * rio_disc_peer- Recursively discovers a RIO network through a master port | |
911 | * @net: RIO network being discovered | |
912 | * @port: Master port to send transactions | |
913 | * @destid: Current destination ID in network | |
914 | * @hopcount: Number of hops into the network | |
9b310acc RD |
915 | * @prev: previous rio_dev |
916 | * @prev_port: previous port number | |
eb188d0e MP |
917 | * |
918 | * Recursively discovers a RIO network. Transactions are sent via the | |
919 | * master port passed in @port. | |
920 | */ | |
305c891e | 921 | static int |
eb188d0e | 922 | rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, |
17e96205 | 923 | u8 hopcount, struct rio_dev *prev, int prev_port) |
eb188d0e MP |
924 | { |
925 | u8 port_num, route_port; | |
eb188d0e MP |
926 | struct rio_dev *rdev; |
927 | u16 ndestid; | |
928 | ||
929 | /* Setup new RIO device */ | |
930 | if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { | |
931 | /* Add device to the global and bus/net specific list. */ | |
932 | list_add_tail(&rdev->net_list, &net->devices); | |
17e96205 AB |
933 | rdev->prev = prev; |
934 | if (prev && rio_is_switch(prev)) | |
935 | prev->rswitch->nextdev[prev_port] = rdev; | |
eb188d0e MP |
936 | } else |
937 | return -1; | |
938 | ||
939 | if (rio_is_switch(rdev)) { | |
eb188d0e | 940 | /* Associated destid is how we accessed this switch */ |
a93192a5 | 941 | rdev->destid = destid; |
eb188d0e | 942 | |
eb188d0e MP |
943 | pr_debug( |
944 | "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", | |
68fe4df5 AB |
945 | rio_name(rdev), rdev->vid, rdev->did, |
946 | RIO_GET_TOTAL_PORTS(rdev->swpinfo)); | |
947 | for (port_num = 0; | |
948 | port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); | |
949 | port_num++) { | |
ae05cbd5 | 950 | if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) |
eb188d0e MP |
951 | continue; |
952 | ||
953 | if (rio_sport_is_active | |
954 | (port, destid, hopcount, port_num)) { | |
955 | pr_debug( | |
956 | "RIO: scanning device on port %d\n", | |
957 | port_num); | |
818a04a0 AB |
958 | |
959 | rio_lock_device(port, destid, hopcount, 1000); | |
960 | ||
e0423236 ZW |
961 | for (ndestid = 0; |
962 | ndestid < RIO_ANY_DESTID(port->sys_size); | |
eb188d0e | 963 | ndestid++) { |
a93192a5 | 964 | rio_route_get_entry(rdev, |
eb188d0e MP |
965 | RIO_GLOBAL_TABLE, |
966 | ndestid, | |
818a04a0 | 967 | &route_port, 0); |
eb188d0e MP |
968 | if (route_port == port_num) |
969 | break; | |
970 | } | |
971 | ||
af84ca38 AB |
972 | if (ndestid == RIO_ANY_DESTID(port->sys_size)) |
973 | continue; | |
818a04a0 | 974 | rio_unlock_device(port, destid, hopcount); |
17e96205 AB |
975 | if (rio_disc_peer(net, port, ndestid, |
976 | hopcount + 1, rdev, port_num) < 0) | |
eb188d0e MP |
977 | return -1; |
978 | } | |
979 | } | |
980 | } else | |
981 | pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", | |
982 | rio_name(rdev), rdev->vid, rdev->did); | |
983 | ||
984 | return 0; | |
985 | } | |
986 | ||
987 | /** | |
988 | * rio_mport_is_active- Tests if master port link is active | |
989 | * @port: Master port to test | |
990 | * | |
991 | * Reads the port error status CSR for the master port to | |
992 | * determine if the port has an active link. Returns | |
e5cabeb3 | 993 | * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active |
eb188d0e MP |
994 | * or %0 if it is inactive. |
995 | */ | |
996 | static int rio_mport_is_active(struct rio_mport *port) | |
997 | { | |
998 | u32 result = 0; | |
999 | u32 ext_ftr_ptr; | |
1000 | int *entry = rio_mport_phys_table; | |
1001 | ||
1002 | do { | |
1003 | if ((ext_ftr_ptr = | |
1004 | rio_mport_get_feature(port, 1, 0, 0, *entry))) | |
1005 | break; | |
1006 | } while (*++entry >= 0); | |
1007 | ||
1008 | if (ext_ftr_ptr) | |
1009 | rio_local_read_config_32(port, | |
1010 | ext_ftr_ptr + | |
1011 | RIO_PORT_N_ERR_STS_CSR(port->index), | |
1012 | &result); | |
1013 | ||
e5cabeb3 | 1014 | return result & RIO_PORT_N_ERR_STS_PORT_OK; |
eb188d0e MP |
1015 | } |
1016 | ||
1017 | /** | |
1018 | * rio_alloc_net- Allocate and configure a new RIO network | |
1019 | * @port: Master port associated with the RIO network | |
de74e00a AB |
1020 | * @do_enum: Enumeration/Discovery mode flag |
1021 | * @start: logical minimal start id for new net | |
eb188d0e MP |
1022 | * |
1023 | * Allocates a RIO network structure, initializes per-network | |
1024 | * list heads, and adds the associated master port to the | |
1025 | * network list of associated master ports. Returns a | |
1026 | * RIO network pointer on success or %NULL on failure. | |
1027 | */ | |
305c891e | 1028 | static struct rio_net *rio_alloc_net(struct rio_mport *port, |
de74e00a | 1029 | int do_enum, u16 start) |
eb188d0e MP |
1030 | { |
1031 | struct rio_net *net; | |
1032 | ||
dd00cc48 | 1033 | net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); |
de74e00a | 1034 | if (net && do_enum) { |
4ed134be AB |
1035 | net->destid_table.table = kcalloc( |
1036 | BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)), | |
de74e00a AB |
1037 | sizeof(long), |
1038 | GFP_KERNEL); | |
1039 | ||
1040 | if (net->destid_table.table == NULL) { | |
1041 | pr_err("RIO: failed to allocate destID table\n"); | |
1042 | kfree(net); | |
1043 | net = NULL; | |
1044 | } else { | |
1045 | net->destid_table.start = start; | |
de74e00a AB |
1046 | net->destid_table.max = |
1047 | RIO_MAX_ROUTE_ENTRIES(port->sys_size); | |
1048 | spin_lock_init(&net->destid_table.lock); | |
1049 | } | |
1050 | } | |
1051 | ||
eb188d0e | 1052 | if (net) { |
eb188d0e MP |
1053 | INIT_LIST_HEAD(&net->node); |
1054 | INIT_LIST_HEAD(&net->devices); | |
a7071efc | 1055 | INIT_LIST_HEAD(&net->switches); |
eb188d0e MP |
1056 | INIT_LIST_HEAD(&net->mports); |
1057 | list_add_tail(&port->nnode, &net->mports); | |
1058 | net->hport = port; | |
005842ef | 1059 | net->id = port->id; |
eb188d0e MP |
1060 | } |
1061 | return net; | |
1062 | } | |
1063 | ||
c70555b0 AB |
1064 | /** |
1065 | * rio_update_route_tables- Updates route tables in switches | |
a7071efc | 1066 | * @net: RIO network to run update on |
c70555b0 AB |
1067 | * |
1068 | * For each enumerated device, ensure that each switch in a system | |
1069 | * has correct routing entries. Add routes for devices that where | |
1070 | * unknown dirung the first enumeration pass through the switch. | |
1071 | */ | |
a7071efc | 1072 | static void rio_update_route_tables(struct rio_net *net) |
c70555b0 | 1073 | { |
ded05782 | 1074 | struct rio_dev *rdev, *swrdev; |
c70555b0 AB |
1075 | struct rio_switch *rswitch; |
1076 | u8 sport; | |
1077 | u16 destid; | |
1078 | ||
a7071efc | 1079 | list_for_each_entry(rdev, &net->devices, net_list) { |
c70555b0 | 1080 | |
a93192a5 | 1081 | destid = rdev->destid; |
c70555b0 | 1082 | |
a7071efc | 1083 | list_for_each_entry(rswitch, &net->switches, node) { |
c70555b0 AB |
1084 | |
1085 | if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) | |
1086 | continue; | |
1087 | ||
1088 | if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { | |
ded05782 AB |
1089 | swrdev = sw_to_rio_dev(rswitch); |
1090 | ||
07590ff0 | 1091 | /* Skip if destid ends in empty switch*/ |
ded05782 | 1092 | if (swrdev->destid == destid) |
07590ff0 | 1093 | continue; |
c70555b0 | 1094 | |
ded05782 | 1095 | sport = RIO_GET_PORT_NUM(swrdev->swpinfo); |
c70555b0 AB |
1096 | |
1097 | if (rswitch->add_entry) { | |
ded05782 | 1098 | rio_route_add_entry(swrdev, |
818a04a0 AB |
1099 | RIO_GLOBAL_TABLE, destid, |
1100 | sport, 0); | |
c70555b0 AB |
1101 | rswitch->route_table[destid] = sport; |
1102 | } | |
1103 | } | |
1104 | } | |
1105 | } | |
1106 | } | |
1107 | ||
e5cabeb3 AB |
1108 | /** |
1109 | * rio_init_em - Initializes RIO Error Management (for switches) | |
97ef6f74 | 1110 | * @rdev: RIO device |
e5cabeb3 AB |
1111 | * |
1112 | * For each enumerated switch, call device-specific error management | |
1113 | * initialization routine (if supplied by the switch driver). | |
1114 | */ | |
1115 | static void rio_init_em(struct rio_dev *rdev) | |
1116 | { | |
1117 | if (rio_is_switch(rdev) && (rdev->em_efptr) && | |
1118 | (rdev->rswitch->em_init)) { | |
1119 | rdev->rswitch->em_init(rdev); | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /** | |
1124 | * rio_pw_enable - Enables/disables port-write handling by a master port | |
1125 | * @port: Master port associated with port-write handling | |
1126 | * @enable: 1=enable, 0=disable | |
1127 | */ | |
1128 | static void rio_pw_enable(struct rio_mport *port, int enable) | |
1129 | { | |
1130 | if (port->ops->pwenable) | |
1131 | port->ops->pwenable(port, enable); | |
1132 | } | |
1133 | ||
eb188d0e MP |
1134 | /** |
1135 | * rio_enum_mport- Start enumeration through a master port | |
1136 | * @mport: Master port to send transactions | |
bc8fcfea | 1137 | * @flags: Enumeration control flags |
eb188d0e MP |
1138 | * |
1139 | * Starts the enumeration process. If somebody has enumerated our | |
1140 | * master port device, then give up. If not and we have an active | |
1141 | * link, then start recursive peer enumeration. Returns %0 if | |
1142 | * enumeration succeeds or %-EBUSY if enumeration fails. | |
1143 | */ | |
bc8fcfea | 1144 | int rio_enum_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
1145 | { |
1146 | struct rio_net *net = NULL; | |
1147 | int rc = 0; | |
1148 | ||
1149 | printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, | |
1150 | mport->name); | |
bc8fcfea AB |
1151 | |
1152 | /* | |
1153 | * To avoid multiple start requests (repeat enumeration is not supported | |
1154 | * by this method) check if enumeration/discovery was performed for this | |
1155 | * mport: if mport was added into the list of mports for a net exit | |
1156 | * with error. | |
1157 | */ | |
1158 | if (mport->nnode.next || mport->nnode.prev) | |
1159 | return -EBUSY; | |
1160 | ||
eb188d0e MP |
1161 | /* If somebody else enumerated our master port device, bail. */ |
1162 | if (rio_enum_host(mport) < 0) { | |
1163 | printk(KERN_INFO | |
1164 | "RIO: master port %d device has been enumerated by a remote host\n", | |
1165 | mport->id); | |
1166 | rc = -EBUSY; | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | /* If master port has an active link, allocate net and enum peers */ | |
1171 | if (rio_mport_is_active(mport)) { | |
de74e00a AB |
1172 | net = rio_alloc_net(mport, 1, 0); |
1173 | if (!net) { | |
eb188d0e MP |
1174 | printk(KERN_ERR "RIO: failed to allocate new net\n"); |
1175 | rc = -ENOMEM; | |
1176 | goto out; | |
1177 | } | |
933af4a6 | 1178 | |
de74e00a AB |
1179 | /* reserve mport destID in new net */ |
1180 | rio_destid_reserve(net, mport->host_deviceid); | |
1181 | ||
933af4a6 TM |
1182 | /* Enable Input Output Port (transmitter reviever) */ |
1183 | rio_enable_rx_tx_port(mport, 1, 0, 0, 0); | |
1184 | ||
af84ca38 AB |
1185 | /* Set component tag for host */ |
1186 | rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, | |
1187 | next_comptag++); | |
1188 | ||
de74e00a AB |
1189 | next_destid = rio_destid_alloc(net); |
1190 | ||
68fe4df5 | 1191 | if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { |
eb188d0e MP |
1192 | /* A higher priority host won enumeration, bail. */ |
1193 | printk(KERN_INFO | |
1194 | "RIO: master port %d device has lost enumeration to a remote host\n", | |
1195 | mport->id); | |
a7071efc | 1196 | rio_clear_locks(net); |
eb188d0e MP |
1197 | rc = -EBUSY; |
1198 | goto out; | |
1199 | } | |
de74e00a AB |
1200 | /* free the last allocated destID (unused) */ |
1201 | rio_destid_free(net, next_destid); | |
a7071efc AB |
1202 | rio_update_route_tables(net); |
1203 | rio_clear_locks(net); | |
e5cabeb3 | 1204 | rio_pw_enable(mport, 1); |
eb188d0e MP |
1205 | } else { |
1206 | printk(KERN_INFO "RIO: master port %d link inactive\n", | |
1207 | mport->id); | |
1208 | rc = -EINVAL; | |
1209 | } | |
1210 | ||
1211 | out: | |
1212 | return rc; | |
1213 | } | |
1214 | ||
1215 | /** | |
1216 | * rio_build_route_tables- Generate route tables from switch route entries | |
a7071efc | 1217 | * @net: RIO network to run route tables scan on |
eb188d0e MP |
1218 | * |
1219 | * For each switch device, generate a route table by copying existing | |
1220 | * route entries from the switch. | |
1221 | */ | |
a7071efc | 1222 | static void rio_build_route_tables(struct rio_net *net) |
eb188d0e | 1223 | { |
a7071efc | 1224 | struct rio_switch *rswitch; |
eb188d0e MP |
1225 | struct rio_dev *rdev; |
1226 | int i; | |
1227 | u8 sport; | |
1228 | ||
a7071efc AB |
1229 | list_for_each_entry(rswitch, &net->switches, node) { |
1230 | rdev = sw_to_rio_dev(rswitch); | |
818a04a0 | 1231 | |
a7071efc AB |
1232 | rio_lock_device(net->hport, rdev->destid, |
1233 | rdev->hopcount, 1000); | |
1234 | for (i = 0; | |
1235 | i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size); | |
1236 | i++) { | |
1237 | if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE, | |
1238 | i, &sport, 0) < 0) | |
1239 | continue; | |
1240 | rswitch->route_table[i] = sport; | |
eb188d0e | 1241 | } |
a7071efc AB |
1242 | |
1243 | rio_unlock_device(net->hport, rdev->destid, rdev->hopcount); | |
1244 | } | |
eb188d0e MP |
1245 | } |
1246 | ||
eb188d0e MP |
1247 | /** |
1248 | * rio_disc_mport- Start discovery through a master port | |
1249 | * @mport: Master port to send transactions | |
bc8fcfea | 1250 | * @flags: discovery control flags |
eb188d0e MP |
1251 | * |
1252 | * Starts the discovery process. If we have an active link, | |
bc8fcfea AB |
1253 | * then wait for the signal that enumeration is complete (if wait |
1254 | * is allowed). | |
eb188d0e MP |
1255 | * When enumeration completion is signaled, start recursive |
1256 | * peer discovery. Returns %0 if discovery succeeds or %-EBUSY | |
1257 | * on failure. | |
1258 | */ | |
bc8fcfea | 1259 | int rio_disc_mport(struct rio_mport *mport, u32 flags) |
eb188d0e MP |
1260 | { |
1261 | struct rio_net *net = NULL; | |
fa3dbaa0 | 1262 | unsigned long to_end; |
eb188d0e MP |
1263 | |
1264 | printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, | |
1265 | mport->name); | |
1266 | ||
1267 | /* If master port has an active link, allocate net and discover peers */ | |
1268 | if (rio_mport_is_active(mport)) { | |
bc8fcfea AB |
1269 | if (rio_enum_complete(mport)) |
1270 | goto enum_done; | |
1271 | else if (flags & RIO_SCAN_ENUM_NO_WAIT) | |
1272 | return -EAGAIN; | |
1273 | ||
fa3dbaa0 | 1274 | pr_debug("RIO: wait for enumeration to complete...\n"); |
eb188d0e | 1275 | |
fa3dbaa0 AB |
1276 | to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; |
1277 | while (time_before(jiffies, to_end)) { | |
1278 | if (rio_enum_complete(mport)) | |
1279 | goto enum_done; | |
f4c9c0e8 | 1280 | msleep(10); |
eb188d0e | 1281 | } |
eb188d0e | 1282 | |
fa3dbaa0 AB |
1283 | pr_debug("RIO: discovery timeout on mport %d %s\n", |
1284 | mport->id, mport->name); | |
1285 | goto bail; | |
1286 | enum_done: | |
1287 | pr_debug("RIO: ... enumeration done\n"); | |
1288 | ||
de74e00a | 1289 | net = rio_alloc_net(mport, 0, 0); |
fa3dbaa0 AB |
1290 | if (!net) { |
1291 | printk(KERN_ERR "RIO: Failed to allocate new net\n"); | |
1292 | goto bail; | |
1293 | } | |
818a04a0 AB |
1294 | |
1295 | /* Read DestID assigned by enumerator */ | |
1296 | rio_local_read_config_32(mport, RIO_DID_CSR, | |
1297 | &mport->host_deviceid); | |
1298 | mport->host_deviceid = RIO_GET_DID(mport->sys_size, | |
1299 | mport->host_deviceid); | |
1300 | ||
e0423236 | 1301 | if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), |
17e96205 | 1302 | 0, NULL, 0) < 0) { |
eb188d0e MP |
1303 | printk(KERN_INFO |
1304 | "RIO: master port %d device has failed discovery\n", | |
1305 | mport->id); | |
1306 | goto bail; | |
1307 | } | |
1308 | ||
a7071efc | 1309 | rio_build_route_tables(net); |
eb188d0e MP |
1310 | } |
1311 | ||
1312 | return 0; | |
fa3dbaa0 | 1313 | bail: |
eb188d0e MP |
1314 | return -EBUSY; |
1315 | } | |
a11650e1 AB |
1316 | |
1317 | static struct rio_scan rio_scan_ops = { | |
1318 | .enumerate = rio_enum_mport, | |
1319 | .discover = rio_disc_mport, | |
1320 | }; | |
1321 | ||
1322 | static bool scan; | |
1323 | module_param(scan, bool, 0); | |
1324 | MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery " | |
1325 | "(default = 0)"); | |
1326 | ||
1327 | /** | |
1328 | * rio_basic_attach: | |
1329 | * | |
1330 | * When this enumeration/discovery method is loaded as a module this function | |
1331 | * registers its specific enumeration and discover routines for all available | |
1332 | * RapidIO mport devices. The "scan" command line parameter controls ability of | |
1333 | * the module to start RapidIO enumeration/discovery automatically. | |
1334 | * | |
1335 | * Returns 0 for success or -EIO if unable to register itself. | |
1336 | * | |
1337 | * This enumeration/discovery method cannot be unloaded and therefore does not | |
1338 | * provide a matching cleanup_module routine. | |
1339 | */ | |
1340 | ||
1341 | static int __init rio_basic_attach(void) | |
1342 | { | |
1343 | if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops)) | |
1344 | return -EIO; | |
1345 | if (scan) | |
1346 | rio_init_mports(); | |
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | late_initcall(rio_basic_attach); | |
1351 | ||
1352 | MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery"); | |
1353 | MODULE_LICENSE("GPL"); |