1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * RapidIO enumeration and discovery support
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 *
8 * Copyright 2009 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 * - Added Port-Write/Error Management initialization and handling
11 *
12 * Copyright 2009 Sysgo AG
13 * Thomas Moll <thomas.moll@sysgo.com>
14 * - Added Input- Output- enable functionality, to allow full communication
15 */
16
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19
20 #include <linux/delay.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/init.h>
23 #include <linux/rio.h>
24 #include <linux/rio_drv.h>
25 #include <linux/rio_ids.h>
26 #include <linux/rio_regs.h>
27 #include <linux/module.h>
28 #include <linux/spinlock.h>
29 #include <linux/timer.h>
30 #include <linux/sched.h>
31 #include <linux/jiffies.h>
32 #include <linux/slab.h>
33
34 #include "rio.h"
35
36 static void rio_init_em(struct rio_dev *rdev);
37
38 struct rio_id_table {
39 u16 start; /* logical minimal id */
40 u32 max; /* max number of IDs in table */
41 spinlock_t lock;
42 unsigned long table[];
43 };
44
45 static int next_destid = 0;
46 static int next_comptag = 1;
47
48 /**
49 * rio_destid_alloc - Allocate next available destID for given network
50 * @net: RIO network
51 *
52 * Returns next available device destination ID for the specified RIO network.
53 * Marks allocated ID as one in use.
54 * Returns RIO_INVALID_DESTID if new destID is not available.
55 */
rio_destid_alloc(struct rio_net * net)56 static u16 rio_destid_alloc(struct rio_net *net)
57 {
58 int destid;
59 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
60
61 spin_lock(&idtab->lock);
62 destid = find_first_zero_bit(idtab->table, idtab->max);
63
64 if (destid < idtab->max) {
65 set_bit(destid, idtab->table);
66 destid += idtab->start;
67 } else
68 destid = RIO_INVALID_DESTID;
69
70 spin_unlock(&idtab->lock);
71 return (u16)destid;
72 }
73
74 /**
75 * rio_destid_reserve - Reserve the specified destID
76 * @net: RIO network
77 * @destid: destID to reserve
78 *
79 * Tries to reserve the specified destID.
80 * Returns 0 if successful.
81 */
rio_destid_reserve(struct rio_net * net,u16 destid)82 static int rio_destid_reserve(struct rio_net *net, u16 destid)
83 {
84 int oldbit;
85 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
86
87 destid -= idtab->start;
88 spin_lock(&idtab->lock);
89 oldbit = test_and_set_bit(destid, idtab->table);
90 spin_unlock(&idtab->lock);
91 return oldbit;
92 }
93
94 /**
95 * rio_destid_free - free a previously allocated destID
96 * @net: RIO network
97 * @destid: destID to free
98 *
99 * Makes the specified destID available for use.
100 */
rio_destid_free(struct rio_net * net,u16 destid)101 static void rio_destid_free(struct rio_net *net, u16 destid)
102 {
103 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
104
105 destid -= idtab->start;
106 spin_lock(&idtab->lock);
107 clear_bit(destid, idtab->table);
108 spin_unlock(&idtab->lock);
109 }
110
111 /**
112 * rio_destid_first - return first destID in use
113 * @net: RIO network
114 */
rio_destid_first(struct rio_net * net)115 static u16 rio_destid_first(struct rio_net *net)
116 {
117 int destid;
118 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
119
120 spin_lock(&idtab->lock);
121 destid = find_first_bit(idtab->table, idtab->max);
122 if (destid >= idtab->max)
123 destid = RIO_INVALID_DESTID;
124 else
125 destid += idtab->start;
126 spin_unlock(&idtab->lock);
127 return (u16)destid;
128 }
129
130 /**
131 * rio_destid_next - return next destID in use
132 * @net: RIO network
133 * @from: destination ID from which search shall continue
134 */
rio_destid_next(struct rio_net * net,u16 from)135 static u16 rio_destid_next(struct rio_net *net, u16 from)
136 {
137 int destid;
138 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
139
140 spin_lock(&idtab->lock);
141 destid = find_next_bit(idtab->table, idtab->max, from);
142 if (destid >= idtab->max)
143 destid = RIO_INVALID_DESTID;
144 else
145 destid += idtab->start;
146 spin_unlock(&idtab->lock);
147 return (u16)destid;
148 }
149
150 /**
151 * rio_get_device_id - Get the base/extended device id for a device
152 * @port: RIO master port
153 * @destid: Destination ID of device
154 * @hopcount: Hopcount to device
155 *
156 * Reads the base/extended device id from a device. Returns the
157 * 8/16-bit device ID.
158 */
rio_get_device_id(struct rio_mport * port,u16 destid,u8 hopcount)159 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
160 {
161 u32 result;
162
163 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
164
165 return RIO_GET_DID(port->sys_size, result);
166 }
167
168 /**
169 * rio_set_device_id - Set the base/extended device id for a device
170 * @port: RIO master port
171 * @destid: Destination ID of device
172 * @hopcount: Hopcount to device
173 * @did: Device ID value to be written
174 *
175 * Writes the base/extended device id from a device.
176 */
rio_set_device_id(struct rio_mport * port,u16 destid,u8 hopcount,u16 did)177 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
178 {
179 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
180 RIO_SET_DID(port->sys_size, did));
181 }
182
183 /**
184 * rio_clear_locks- Release all host locks and signal enumeration complete
185 * @net: RIO network to run on
186 *
187 * Marks the component tag CSR on each device with the enumeration
188 * complete flag. When complete, it then release the host locks on
189 * each device. Returns 0 on success or %-EINVAL on failure.
190 */
rio_clear_locks(struct rio_net * net)191 static int rio_clear_locks(struct rio_net *net)
192 {
193 struct rio_mport *port = net->hport;
194 struct rio_dev *rdev;
195 u32 result;
196 int ret = 0;
197
198 /* Release host device id locks */
199 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
200 port->host_deviceid);
201 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
202 if ((result & 0xffff) != 0xffff) {
203 printk(KERN_INFO
204 "RIO: badness when releasing host lock on master port, result %8.8x\n",
205 result);
206 ret = -EINVAL;
207 }
208 list_for_each_entry(rdev, &net->devices, net_list) {
209 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
210 port->host_deviceid);
211 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
212 if ((result & 0xffff) != 0xffff) {
213 printk(KERN_INFO
214 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
215 rdev->vid, rdev->did);
216 ret = -EINVAL;
217 }
218
219 /* Mark device as discovered and enable master */
220 rio_read_config_32(rdev,
221 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
222 &result);
223 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
224 rio_write_config_32(rdev,
225 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
226 result);
227 }
228
229 return ret;
230 }
231
232 /**
233 * rio_enum_host- Set host lock and initialize host destination ID
234 * @port: Master port to issue transaction
235 *
236 * Sets the local host master port lock and destination ID register
237 * with the host device ID value. The host device ID value is provided
238 * by the platform. Returns %0 on success or %-1 on failure.
239 */
rio_enum_host(struct rio_mport * port)240 static int rio_enum_host(struct rio_mport *port)
241 {
242 u32 result;
243
244 /* Set master port host device id lock */
245 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
246 port->host_deviceid);
247
248 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
249 if ((result & 0xffff) != port->host_deviceid)
250 return -1;
251
252 /* Set master port destid and init destid ctr */
253 rio_local_set_device_id(port, port->host_deviceid);
254 return 0;
255 }
256
257 /**
258 * rio_device_has_destid- Test if a device contains a destination ID register
259 * @port: Master port to issue transaction
260 * @src_ops: RIO device source operations
261 * @dst_ops: RIO device destination operations
262 *
263 * Checks the provided @src_ops and @dst_ops for the necessary transaction
264 * capabilities that indicate whether or not a device will implement a
265 * destination ID register. Returns 1 if true or 0 if false.
266 */
rio_device_has_destid(struct rio_mport * port,int src_ops,int dst_ops)267 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
268 int dst_ops)
269 {
270 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
271
272 return !!((src_ops | dst_ops) & mask);
273 }
274
275 /**
276 * rio_release_dev- Frees a RIO device struct
277 * @dev: LDM device associated with a RIO device struct
278 *
279 * Gets the RIO device struct associated a RIO device struct.
280 * The RIO device struct is freed.
281 */
rio_release_dev(struct device * dev)282 static void rio_release_dev(struct device *dev)
283 {
284 struct rio_dev *rdev;
285
286 rdev = to_rio_dev(dev);
287 kfree(rdev);
288 }
289
290 /**
291 * rio_is_switch- Tests if a RIO device has switch capabilities
292 * @rdev: RIO device
293 *
294 * Gets the RIO device Processing Element Features register
295 * contents and tests for switch capabilities. Returns 1 if
296 * the device is a switch or 0 if it is not a switch.
297 * The RIO device struct is freed.
298 */
rio_is_switch(struct rio_dev * rdev)299 static int rio_is_switch(struct rio_dev *rdev)
300 {
301 if (rdev->pef & RIO_PEF_SWITCH)
302 return 1;
303 return 0;
304 }
305
306 /**
307 * rio_setup_device- Allocates and sets up a RIO device
308 * @net: RIO network
309 * @port: Master port to send transactions
310 * @destid: Current destination ID
311 * @hopcount: Current hopcount
312 * @do_enum: Enumeration/Discovery mode flag
313 *
314 * Allocates a RIO device and configures fields based on configuration
315 * space contents. If device has a destination ID register, a destination
316 * ID is either assigned in enumeration mode or read from configuration
317 * space in discovery mode. If the device has switch capabilities, then
318 * a switch is allocated and configured appropriately. Returns a pointer
319 * to a RIO device on success or NULL on failure.
320 *
321 */
rio_setup_device(struct rio_net * net,struct rio_mport * port,u16 destid,u8 hopcount,int do_enum)322 static struct rio_dev *rio_setup_device(struct rio_net *net,
323 struct rio_mport *port, u16 destid,
324 u8 hopcount, int do_enum)
325 {
326 int ret = 0;
327 struct rio_dev *rdev;
328 struct rio_switch *rswitch = NULL;
329 int result, rdid;
330 size_t size;
331 u32 swpinfo = 0;
332
333 size = sizeof(*rdev);
334 if (rio_mport_read_config_32(port, destid, hopcount,
335 RIO_PEF_CAR, &result))
336 return NULL;
337
338 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
339 rio_mport_read_config_32(port, destid, hopcount,
340 RIO_SWP_INFO_CAR, &swpinfo);
341 if (result & RIO_PEF_SWITCH)
342 size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo));
343 }
344
345 rdev = kzalloc(size, GFP_KERNEL);
346 if (!rdev)
347 return NULL;
348
349 rdev->net = net;
350 rdev->pef = result;
351 rdev->swpinfo = swpinfo;
352 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
353 &result);
354 rdev->did = result >> 16;
355 rdev->vid = result & 0xffff;
356 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
357 &rdev->device_rev);
358 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
359 &result);
360 rdev->asm_did = result >> 16;
361 rdev->asm_vid = result & 0xffff;
362 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
363 &result);
364 rdev->asm_rev = result >> 16;
365 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
366 rdev->efptr = result & 0xffff;
367 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
368 hopcount, &rdev->phys_rmap);
369 pr_debug("RIO: %s Register Map %d device\n",
370 __func__, rdev->phys_rmap);
371
372 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
373 hopcount, RIO_EFB_ERR_MGMNT);
374 if (!rdev->em_efptr)
375 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
376 hopcount, RIO_EFB_ERR_MGMNT_HS);
377 }
378
379 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
380 &rdev->src_ops);
381 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
382 &rdev->dst_ops);
383
384 if (do_enum) {
385 /* Assign component tag to device */
386 if (next_comptag >= 0x10000) {
387 pr_err("RIO: Component Tag Counter Overflow\n");
388 goto cleanup;
389 }
390 rio_mport_write_config_32(port, destid, hopcount,
391 RIO_COMPONENT_TAG_CSR, next_comptag);
392 rdev->comp_tag = next_comptag++;
393 rdev->do_enum = true;
394 } else {
395 rio_mport_read_config_32(port, destid, hopcount,
396 RIO_COMPONENT_TAG_CSR,
397 &rdev->comp_tag);
398 }
399
400 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
401 if (do_enum) {
402 rio_set_device_id(port, destid, hopcount, next_destid);
403 rdev->destid = next_destid;
404 next_destid = rio_destid_alloc(net);
405 } else
406 rdev->destid = rio_get_device_id(port, destid, hopcount);
407
408 rdev->hopcount = 0xff;
409 } else {
410 /* Switch device has an associated destID which
411 * will be adjusted later
412 */
413 rdev->destid = destid;
414 rdev->hopcount = hopcount;
415 }
416
417 /* If a PE has both switch and other functions, show it as a switch */
418 if (rio_is_switch(rdev)) {
419 rswitch = rdev->rswitch;
420 rswitch->port_ok = 0;
421 spin_lock_init(&rswitch->lock);
422 rswitch->route_table =
423 kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size),
424 GFP_KERNEL);
425 if (!rswitch->route_table)
426 goto cleanup;
427 /* Initialize switch route table */
428 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
429 rdid++)
430 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
431 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
432 rdev->comp_tag & RIO_CTAG_UDEVID);
433
434 if (do_enum)
435 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
436 } else {
437 if (do_enum)
438 /*Enable Input Output Port (transmitter receiver)*/
439 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
440
441 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
442 rdev->comp_tag & RIO_CTAG_UDEVID);
443 }
444
445 rdev->dev.parent = &net->dev;
446 rio_attach_device(rdev);
447 rdev->dev.release = rio_release_dev;
448 rdev->dma_mask = DMA_BIT_MASK(32);
449 rdev->dev.dma_mask = &rdev->dma_mask;
450 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
451
452 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
453 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
454 0, 0xffff);
455
456 ret = rio_add_device(rdev);
457 if (ret) {
458 if (rswitch)
459 kfree(rswitch->route_table);
460 put_device(&rdev->dev);
461 return NULL;
462 }
463
464 rio_dev_get(rdev);
465
466 return rdev;
467
468 cleanup:
469 if (rswitch)
470 kfree(rswitch->route_table);
471
472 kfree(rdev);
473 return NULL;
474 }
475
476 /**
477 * rio_sport_is_active- Tests if a switch port has an active connection.
478 * @rdev: RapidIO device object
479 * @sp: Switch port number
480 *
481 * Reads the port error status CSR for a particular switch port to
482 * determine if the port has an active link. Returns
483 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
484 * inactive.
485 */
486 static int
rio_sport_is_active(struct rio_dev * rdev,int sp)487 rio_sport_is_active(struct rio_dev *rdev, int sp)
488 {
489 u32 result = 0;
490
491 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
492 &result);
493
494 return result & RIO_PORT_N_ERR_STS_PORT_OK;
495 }
496
497 /**
498 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
499 * @port: Master port to send transaction
500 * @hopcount: Number of hops to the device
501 *
502 * Used during enumeration to read the Host Device ID Lock CSR on a
503 * RIO device. Returns the value of the lock register.
504 */
rio_get_host_deviceid_lock(struct rio_mport * port,u8 hopcount)505 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
506 {
507 u32 result;
508
509 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
510 RIO_HOST_DID_LOCK_CSR, &result);
511
512 return (u16) (result & 0xffff);
513 }
514
515 /**
516 * rio_enum_peer- Recursively enumerate a RIO network through a master port
517 * @net: RIO network being enumerated
518 * @port: Master port to send transactions
519 * @hopcount: Number of hops into the network
520 * @prev: Previous RIO device connected to the enumerated one
521 * @prev_port: Port on previous RIO device
522 *
523 * Recursively enumerates a RIO network. Transactions are sent via the
524 * master port passed in @port.
525 */
rio_enum_peer(struct rio_net * net,struct rio_mport * port,u8 hopcount,struct rio_dev * prev,int prev_port)526 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
527 u8 hopcount, struct rio_dev *prev, int prev_port)
528 {
529 struct rio_dev *rdev;
530 u32 regval;
531 int tmp;
532
533 if (rio_mport_chk_dev_access(port,
534 RIO_ANY_DESTID(port->sys_size), hopcount)) {
535 pr_debug("RIO: device access check failed\n");
536 return -1;
537 }
538
539 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
540 pr_debug("RIO: PE already discovered by this host\n");
541 /*
542 * Already discovered by this host. Add it as another
543 * link to the existing device.
544 */
545 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
546 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
547
548 if (regval) {
549 rdev = rio_get_comptag((regval & 0xffff), NULL);
550
551 if (rdev && prev && rio_is_switch(prev)) {
552 pr_debug("RIO: redundant path to %s\n",
553 rio_name(rdev));
554 prev->rswitch->nextdev[prev_port] = rdev;
555 }
556 }
557
558 return 0;
559 }
560
561 /* Attempt to acquire device lock */
562 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
563 hopcount,
564 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
565 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
566 < port->host_deviceid) {
567 /* Delay a bit */
568 mdelay(1);
569 /* Attempt to acquire device lock again */
570 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
571 hopcount,
572 RIO_HOST_DID_LOCK_CSR,
573 port->host_deviceid);
574 }
575
576 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
577 pr_debug(
578 "RIO: PE locked by a higher priority host...retreating\n");
579 return -1;
580 }
581
582 /* Setup new RIO device */
583 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
584 hopcount, 1);
585 if (rdev) {
586 rdev->prev = prev;
587 if (prev && rio_is_switch(prev))
588 prev->rswitch->nextdev[prev_port] = rdev;
589 } else
590 return -1;
591
592 if (rio_is_switch(rdev)) {
593 int sw_destid;
594 int cur_destid;
595 int sw_inport;
596 u16 destid;
597 int port_num;
598
599 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
600 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
601 port->host_deviceid, sw_inport, 0);
602 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
603
604 destid = rio_destid_first(net);
605 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
606 if (destid != port->host_deviceid) {
607 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
608 destid, sw_inport, 0);
609 rdev->rswitch->route_table[destid] = sw_inport;
610 }
611 destid = rio_destid_next(net, destid + 1);
612 }
613 pr_debug(
614 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
615 rio_name(rdev), rdev->vid, rdev->did,
616 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
617 sw_destid = next_destid;
618 for (port_num = 0;
619 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
620 port_num++) {
621 if (sw_inport == port_num) {
622 rio_enable_rx_tx_port(port, 0,
623 RIO_ANY_DESTID(port->sys_size),
624 hopcount, port_num);
625 rdev->rswitch->port_ok |= (1 << port_num);
626 continue;
627 }
628
629 cur_destid = next_destid;
630
631 if (rio_sport_is_active(rdev, port_num)) {
632 pr_debug(
633 "RIO: scanning device on port %d\n",
634 port_num);
635 rio_enable_rx_tx_port(port, 0,
636 RIO_ANY_DESTID(port->sys_size),
637 hopcount, port_num);
638 rdev->rswitch->port_ok |= (1 << port_num);
639 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
640 RIO_ANY_DESTID(port->sys_size),
641 port_num, 0);
642
643 if (rio_enum_peer(net, port, hopcount + 1,
644 rdev, port_num) < 0)
645 return -1;
646
647 /* Update routing tables */
648 destid = rio_destid_next(net, cur_destid + 1);
649 if (destid != RIO_INVALID_DESTID) {
650 for (destid = cur_destid;
651 destid < next_destid;) {
652 if (destid != port->host_deviceid) {
653 rio_route_add_entry(rdev,
654 RIO_GLOBAL_TABLE,
655 destid,
656 port_num,
657 0);
658 rdev->rswitch->
659 route_table[destid] =
660 port_num;
661 }
662 destid = rio_destid_next(net,
663 destid + 1);
664 }
665 }
666 } else {
667 /* If switch supports Error Management,
668 * set PORT_LOCKOUT bit for unused port
669 */
670 if (rdev->em_efptr)
671 rio_set_port_lockout(rdev, port_num, 1);
672
673 rdev->rswitch->port_ok &= ~(1 << port_num);
674 }
675 }
676
677 /* Direct Port-write messages to the enumeratiing host */
678 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
679 (rdev->em_efptr)) {
680 rio_write_config_32(rdev,
681 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
682 (port->host_deviceid << 16) |
683 (port->sys_size << 15));
684 }
685
686 rio_init_em(rdev);
687
688 /* Check for empty switch */
689 if (next_destid == sw_destid)
690 next_destid = rio_destid_alloc(net);
691
692 rdev->destid = sw_destid;
693 } else
694 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
695 rio_name(rdev), rdev->vid, rdev->did);
696
697 return 0;
698 }
699
700 /**
701 * rio_enum_complete- Tests if enumeration of a network is complete
702 * @port: Master port to send transaction
703 *
704 * Tests the PGCCSR discovered bit for non-zero value (enumeration
705 * complete flag). Return %1 if enumeration is complete or %0 if
706 * enumeration is incomplete.
707 */
rio_enum_complete(struct rio_mport * port)708 static int rio_enum_complete(struct rio_mport *port)
709 {
710 u32 regval;
711
712 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
713 ®val);
714 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
715 }
716
717 /**
718 * rio_disc_peer- Recursively discovers a RIO network through a master port
719 * @net: RIO network being discovered
720 * @port: Master port to send transactions
721 * @destid: Current destination ID in network
722 * @hopcount: Number of hops into the network
723 * @prev: previous rio_dev
724 * @prev_port: previous port number
725 *
726 * Recursively discovers a RIO network. Transactions are sent via the
727 * master port passed in @port.
728 */
729 static int
rio_disc_peer(struct rio_net * net,struct rio_mport * port,u16 destid,u8 hopcount,struct rio_dev * prev,int prev_port)730 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
731 u8 hopcount, struct rio_dev *prev, int prev_port)
732 {
733 u8 port_num, route_port;
734 struct rio_dev *rdev;
735 u16 ndestid;
736
737 /* Setup new RIO device */
738 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
739 rdev->prev = prev;
740 if (prev && rio_is_switch(prev))
741 prev->rswitch->nextdev[prev_port] = rdev;
742 } else
743 return -1;
744
745 if (rio_is_switch(rdev)) {
746 /* Associated destid is how we accessed this switch */
747 rdev->destid = destid;
748
749 pr_debug(
750 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
751 rio_name(rdev), rdev->vid, rdev->did,
752 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
753 for (port_num = 0;
754 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
755 port_num++) {
756 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
757 continue;
758
759 if (rio_sport_is_active(rdev, port_num)) {
760 pr_debug(
761 "RIO: scanning device on port %d\n",
762 port_num);
763
764 rio_lock_device(port, destid, hopcount, 1000);
765
766 for (ndestid = 0;
767 ndestid < RIO_ANY_DESTID(port->sys_size);
768 ndestid++) {
769 rio_route_get_entry(rdev,
770 RIO_GLOBAL_TABLE,
771 ndestid,
772 &route_port, 0);
773 if (route_port == port_num)
774 break;
775 }
776
777 if (ndestid == RIO_ANY_DESTID(port->sys_size))
778 continue;
779 rio_unlock_device(port, destid, hopcount);
780 if (rio_disc_peer(net, port, ndestid,
781 hopcount + 1, rdev, port_num) < 0)
782 return -1;
783 }
784 }
785 } else
786 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
787 rio_name(rdev), rdev->vid, rdev->did);
788
789 return 0;
790 }
791
792 /**
793 * rio_mport_is_active- Tests if master port link is active
794 * @port: Master port to test
795 *
796 * Reads the port error status CSR for the master port to
797 * determine if the port has an active link. Returns
798 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
799 * or %0 if it is inactive.
800 */
rio_mport_is_active(struct rio_mport * port)801 static int rio_mport_is_active(struct rio_mport *port)
802 {
803 u32 result = 0;
804
805 rio_local_read_config_32(port,
806 port->phys_efptr +
807 RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
808 &result);
809 return result & RIO_PORT_N_ERR_STS_PORT_OK;
810 }
811
rio_scan_release_net(struct rio_net * net)812 static void rio_scan_release_net(struct rio_net *net)
813 {
814 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
815 kfree(net->enum_data);
816 }
817
rio_scan_release_dev(struct device * dev)818 static void rio_scan_release_dev(struct device *dev)
819 {
820 struct rio_net *net;
821
822 net = to_rio_net(dev);
823 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
824 kfree(net);
825 }
826
827 /*
828 * rio_scan_alloc_net - Allocate and configure a new RIO network
829 * @mport: Master port associated with the RIO network
830 * @do_enum: Enumeration/Discovery mode flag
831 * @start: logical minimal start id for new net
832 *
833 * Allocates a new RIO network structure and initializes enumerator-specific
834 * part of it (if required).
835 * Returns a RIO network pointer on success or %NULL on failure.
836 */
rio_scan_alloc_net(struct rio_mport * mport,int do_enum,u16 start)837 static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
838 int do_enum, u16 start)
839 {
840 struct rio_net *net;
841
842 net = rio_alloc_net(mport);
843
844 if (net && do_enum) {
845 struct rio_id_table *idtab;
846 size_t size;
847
848 size = sizeof(struct rio_id_table) +
849 BITS_TO_LONGS(
850 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
851 ) * sizeof(long);
852
853 idtab = kzalloc(size, GFP_KERNEL);
854
855 if (idtab == NULL) {
856 pr_err("RIO: failed to allocate destID table\n");
857 rio_free_net(net);
858 net = NULL;
859 } else {
860 net->enum_data = idtab;
861 net->release = rio_scan_release_net;
862 idtab->start = start;
863 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
864 spin_lock_init(&idtab->lock);
865 }
866 }
867
868 if (net) {
869 net->id = mport->id;
870 net->hport = mport;
871 dev_set_name(&net->dev, "rnet_%d", net->id);
872 net->dev.parent = &mport->dev;
873 net->dev.release = rio_scan_release_dev;
874 rio_add_net(net);
875 }
876
877 return net;
878 }
879
880 /**
881 * rio_update_route_tables- Updates route tables in switches
882 * @net: RIO network to run update on
883 *
884 * For each enumerated device, ensure that each switch in a system
885 * has correct routing entries. Add routes for devices that where
886 * unknown during the first enumeration pass through the switch.
887 */
rio_update_route_tables(struct rio_net * net)888 static void rio_update_route_tables(struct rio_net *net)
889 {
890 struct rio_dev *rdev, *swrdev;
891 struct rio_switch *rswitch;
892 u8 sport;
893 u16 destid;
894
895 list_for_each_entry(rdev, &net->devices, net_list) {
896
897 destid = rdev->destid;
898
899 list_for_each_entry(rswitch, &net->switches, node) {
900
901 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
902 continue;
903
904 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
905 swrdev = sw_to_rio_dev(rswitch);
906
907 /* Skip if destid ends in empty switch*/
908 if (swrdev->destid == destid)
909 continue;
910
911 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
912
913 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
914 destid, sport, 0);
915 rswitch->route_table[destid] = sport;
916 }
917 }
918 }
919 }
920
921 /**
922 * rio_init_em - Initializes RIO Error Management (for switches)
923 * @rdev: RIO device
924 *
925 * For each enumerated switch, call device-specific error management
926 * initialization routine (if supplied by the switch driver).
927 */
rio_init_em(struct rio_dev * rdev)928 static void rio_init_em(struct rio_dev *rdev)
929 {
930 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
931 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
932 rdev->rswitch->ops->em_init(rdev);
933 }
934 }
935
936 /**
937 * rio_enum_mport- Start enumeration through a master port
938 * @mport: Master port to send transactions
939 * @flags: Enumeration control flags
940 *
941 * Starts the enumeration process. If somebody has enumerated our
942 * master port device, then give up. If not and we have an active
943 * link, then start recursive peer enumeration. Returns %0 if
944 * enumeration succeeds or %-EBUSY if enumeration fails.
945 */
rio_enum_mport(struct rio_mport * mport,u32 flags)946 static int rio_enum_mport(struct rio_mport *mport, u32 flags)
947 {
948 struct rio_net *net = NULL;
949 int rc = 0;
950
951 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
952 mport->name);
953
954 /*
955 * To avoid multiple start requests (repeat enumeration is not supported
956 * by this method) check if enumeration/discovery was performed for this
957 * mport: if mport was added into the list of mports for a net exit
958 * with error.
959 */
960 if (mport->nnode.next || mport->nnode.prev)
961 return -EBUSY;
962
963 /* If somebody else enumerated our master port device, bail. */
964 if (rio_enum_host(mport) < 0) {
965 printk(KERN_INFO
966 "RIO: master port %d device has been enumerated by a remote host\n",
967 mport->id);
968 rc = -EBUSY;
969 goto out;
970 }
971
972 /* If master port has an active link, allocate net and enum peers */
973 if (rio_mport_is_active(mport)) {
974 net = rio_scan_alloc_net(mport, 1, 0);
975 if (!net) {
976 printk(KERN_ERR "RIO: failed to allocate new net\n");
977 rc = -ENOMEM;
978 goto out;
979 }
980
981 /* reserve mport destID in new net */
982 rio_destid_reserve(net, mport->host_deviceid);
983
984 /* Enable Input Output Port (transmitter receiver) */
985 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
986
987 /* Set component tag for host */
988 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
989 next_comptag++);
990
991 next_destid = rio_destid_alloc(net);
992
993 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
994 /* A higher priority host won enumeration, bail. */
995 printk(KERN_INFO
996 "RIO: master port %d device has lost enumeration to a remote host\n",
997 mport->id);
998 rio_clear_locks(net);
999 rc = -EBUSY;
1000 goto out;
1001 }
1002 /* free the last allocated destID (unused) */
1003 rio_destid_free(net, next_destid);
1004 rio_update_route_tables(net);
1005 rio_clear_locks(net);
1006 rio_pw_enable(mport, 1);
1007 } else {
1008 printk(KERN_INFO "RIO: master port %d link inactive\n",
1009 mport->id);
1010 rc = -EINVAL;
1011 }
1012
1013 out:
1014 return rc;
1015 }
1016
1017 /**
1018 * rio_build_route_tables- Generate route tables from switch route entries
1019 * @net: RIO network to run route tables scan on
1020 *
1021 * For each switch device, generate a route table by copying existing
1022 * route entries from the switch.
1023 */
rio_build_route_tables(struct rio_net * net)1024 static void rio_build_route_tables(struct rio_net *net)
1025 {
1026 struct rio_switch *rswitch;
1027 struct rio_dev *rdev;
1028 int i;
1029 u8 sport;
1030
1031 list_for_each_entry(rswitch, &net->switches, node) {
1032 rdev = sw_to_rio_dev(rswitch);
1033
1034 rio_lock_device(net->hport, rdev->destid,
1035 rdev->hopcount, 1000);
1036 for (i = 0;
1037 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1038 i++) {
1039 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1040 i, &sport, 0) < 0)
1041 continue;
1042 rswitch->route_table[i] = sport;
1043 }
1044
1045 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1046 }
1047 }
1048
1049 /**
1050 * rio_disc_mport- Start discovery through a master port
1051 * @mport: Master port to send transactions
1052 * @flags: discovery control flags
1053 *
1054 * Starts the discovery process. If we have an active link,
1055 * then wait for the signal that enumeration is complete (if wait
1056 * is allowed).
1057 * When enumeration completion is signaled, start recursive
1058 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1059 * on failure.
1060 */
rio_disc_mport(struct rio_mport * mport,u32 flags)1061 static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1062 {
1063 struct rio_net *net = NULL;
1064 unsigned long to_end;
1065
1066 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1067 mport->name);
1068
1069 /* If master port has an active link, allocate net and discover peers */
1070 if (rio_mport_is_active(mport)) {
1071 if (rio_enum_complete(mport))
1072 goto enum_done;
1073 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1074 return -EAGAIN;
1075
1076 pr_debug("RIO: wait for enumeration to complete...\n");
1077
1078 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1079 while (time_before(jiffies, to_end)) {
1080 if (rio_enum_complete(mport))
1081 goto enum_done;
1082 msleep(10);
1083 }
1084
1085 pr_debug("RIO: discovery timeout on mport %d %s\n",
1086 mport->id, mport->name);
1087 goto bail;
1088 enum_done:
1089 pr_debug("RIO: ... enumeration done\n");
1090
1091 net = rio_scan_alloc_net(mport, 0, 0);
1092 if (!net) {
1093 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1094 goto bail;
1095 }
1096
1097 /* Read DestID assigned by enumerator */
1098 rio_local_read_config_32(mport, RIO_DID_CSR,
1099 &mport->host_deviceid);
1100 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1101 mport->host_deviceid);
1102
1103 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1104 0, NULL, 0) < 0) {
1105 printk(KERN_INFO
1106 "RIO: master port %d device has failed discovery\n",
1107 mport->id);
1108 goto bail;
1109 }
1110
1111 rio_build_route_tables(net);
1112 }
1113
1114 return 0;
1115 bail:
1116 return -EBUSY;
1117 }
1118
1119 static struct rio_scan rio_scan_ops = {
1120 .owner = THIS_MODULE,
1121 .enumerate = rio_enum_mport,
1122 .discover = rio_disc_mport,
1123 };
1124
1125 static bool scan;
1126 module_param(scan, bool, 0);
1127 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1128 "(default = 0)");
1129
1130 /**
1131 * rio_basic_attach:
1132 *
1133 * When this enumeration/discovery method is loaded as a module this function
1134 * registers its specific enumeration and discover routines for all available
1135 * RapidIO mport devices. The "scan" command line parameter controls ability of
1136 * the module to start RapidIO enumeration/discovery automatically.
1137 *
1138 * Returns 0 for success or -EIO if unable to register itself.
1139 *
1140 * This enumeration/discovery method cannot be unloaded and therefore does not
1141 * provide a matching cleanup_module routine.
1142 */
1143
rio_basic_attach(void)1144 static int __init rio_basic_attach(void)
1145 {
1146 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1147 return -EIO;
1148 if (scan)
1149 rio_init_mports();
1150 return 0;
1151 }
1152
1153 late_initcall(rio_basic_attach);
1154
1155 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1156 MODULE_LICENSE("GPL");
1157