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1/*
2 * RapidIO enumeration and discovery support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * Copyright 2009 Integrated Device Technology, Inc.
8 * Alex Bounine <alexandre.bounine@idt.com>
9 * - Added Port-Write/Error Management initialization and handling
10 *
11 * Copyright 2009 Sysgo AG
12 * Thomas Moll <thomas.moll@sysgo.com>
13 * - Added Input- Output- enable functionality, to allow full communication
14 *
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
21#include <linux/types.h>
22#include <linux/kernel.h>
23
24#include <linux/delay.h>
25#include <linux/dma-mapping.h>
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>
34#include <linux/sched.h>
35#include <linux/jiffies.h>
36#include <linux/slab.h>
37
38#include "rio.h"
39
40static void rio_init_em(struct rio_dev *rdev);
41
42struct rio_id_table {
43 u16 start; /* logical minimal id */
44 u32 max; /* max number of IDs in table */
45 spinlock_t lock;
46 unsigned long table[0];
47};
48
49static int next_destid = 0;
50static int next_comptag = 1;
51
52static int rio_mport_phys_table[] = {
53 RIO_EFB_PAR_EP_ID,
54 RIO_EFB_PAR_EP_REC_ID,
55 RIO_EFB_SER_EP_ID,
56 RIO_EFB_SER_EP_REC_ID,
57 -1,
58};
59
60
61/**
62 * rio_destid_alloc - Allocate next available destID for given network
63 * @net: RIO network
64 *
65 * Returns next available device destination ID for the specified RIO network.
66 * Marks allocated ID as one in use.
67 * Returns RIO_INVALID_DESTID if new destID is not available.
68 */
69static u16 rio_destid_alloc(struct rio_net *net)
70{
71 int destid;
72 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
73
74 spin_lock(&idtab->lock);
75 destid = find_first_zero_bit(idtab->table, idtab->max);
76
77 if (destid < idtab->max) {
78 set_bit(destid, idtab->table);
79 destid += idtab->start;
80 } else
81 destid = RIO_INVALID_DESTID;
82
83 spin_unlock(&idtab->lock);
84 return (u16)destid;
85}
86
87/**
88 * rio_destid_reserve - Reserve the specivied destID
89 * @net: RIO network
90 * @destid: destID to reserve
91 *
92 * Tries to reserve the specified destID.
93 * Returns 0 if successful.
94 */
95static int rio_destid_reserve(struct rio_net *net, u16 destid)
96{
97 int oldbit;
98 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
99
100 destid -= idtab->start;
101 spin_lock(&idtab->lock);
102 oldbit = test_and_set_bit(destid, idtab->table);
103 spin_unlock(&idtab->lock);
104 return oldbit;
105}
106
107/**
108 * rio_destid_free - free a previously allocated destID
109 * @net: RIO network
110 * @destid: destID to free
111 *
112 * Makes the specified destID available for use.
113 */
114static void rio_destid_free(struct rio_net *net, u16 destid)
115{
116 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
117
118 destid -= idtab->start;
119 spin_lock(&idtab->lock);
120 clear_bit(destid, idtab->table);
121 spin_unlock(&idtab->lock);
122}
123
124/**
125 * rio_destid_first - return first destID in use
126 * @net: RIO network
127 */
128static u16 rio_destid_first(struct rio_net *net)
129{
130 int destid;
131 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
132
133 spin_lock(&idtab->lock);
134 destid = find_first_bit(idtab->table, idtab->max);
135 if (destid >= idtab->max)
136 destid = RIO_INVALID_DESTID;
137 else
138 destid += idtab->start;
139 spin_unlock(&idtab->lock);
140 return (u16)destid;
141}
142
143/**
144 * rio_destid_next - return next destID in use
145 * @net: RIO network
146 * @from: destination ID from which search shall continue
147 */
148static u16 rio_destid_next(struct rio_net *net, u16 from)
149{
150 int destid;
151 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
152
153 spin_lock(&idtab->lock);
154 destid = find_next_bit(idtab->table, idtab->max, from);
155 if (destid >= idtab->max)
156 destid = RIO_INVALID_DESTID;
157 else
158 destid += idtab->start;
159 spin_unlock(&idtab->lock);
160 return (u16)destid;
161}
162
163/**
164 * rio_get_device_id - Get the base/extended device id for a device
165 * @port: RIO master port
166 * @destid: Destination ID of device
167 * @hopcount: Hopcount to device
168 *
169 * Reads the base/extended device id from a device. Returns the
170 * 8/16-bit device ID.
171 */
172static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
173{
174 u32 result;
175
176 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
177
178 return RIO_GET_DID(port->sys_size, result);
179}
180
181/**
182 * rio_set_device_id - Set the base/extended device id for a device
183 * @port: RIO master port
184 * @destid: Destination ID of device
185 * @hopcount: Hopcount to device
186 * @did: Device ID value to be written
187 *
188 * Writes the base/extended device id from a device.
189 */
190static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
191{
192 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
193 RIO_SET_DID(port->sys_size, did));
194}
195
196/**
197 * rio_clear_locks- Release all host locks and signal enumeration complete
198 * @net: RIO network to run on
199 *
200 * Marks the component tag CSR on each device with the enumeration
201 * complete flag. When complete, it then release the host locks on
202 * each device. Returns 0 on success or %-EINVAL on failure.
203 */
204static int rio_clear_locks(struct rio_net *net)
205{
206 struct rio_mport *port = net->hport;
207 struct rio_dev *rdev;
208 u32 result;
209 int ret = 0;
210
211 /* Release host device id locks */
212 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
213 port->host_deviceid);
214 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
215 if ((result & 0xffff) != 0xffff) {
216 printk(KERN_INFO
217 "RIO: badness when releasing host lock on master port, result %8.8x\n",
218 result);
219 ret = -EINVAL;
220 }
221 list_for_each_entry(rdev, &net->devices, net_list) {
222 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
223 port->host_deviceid);
224 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
225 if ((result & 0xffff) != 0xffff) {
226 printk(KERN_INFO
227 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
228 rdev->vid, rdev->did);
229 ret = -EINVAL;
230 }
231
232 /* Mark device as discovered and enable master */
233 rio_read_config_32(rdev,
234 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
235 &result);
236 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
237 rio_write_config_32(rdev,
238 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
239 result);
240 }
241
242 return ret;
243}
244
245/**
246 * rio_enum_host- Set host lock and initialize host destination ID
247 * @port: Master port to issue transaction
248 *
249 * Sets the local host master port lock and destination ID register
250 * with the host device ID value. The host device ID value is provided
251 * by the platform. Returns %0 on success or %-1 on failure.
252 */
253static int rio_enum_host(struct rio_mport *port)
254{
255 u32 result;
256
257 /* Set master port host device id lock */
258 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
259 port->host_deviceid);
260
261 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
262 if ((result & 0xffff) != port->host_deviceid)
263 return -1;
264
265 /* Set master port destid and init destid ctr */
266 rio_local_set_device_id(port, port->host_deviceid);
267 return 0;
268}
269
270/**
271 * rio_device_has_destid- Test if a device contains a destination ID register
272 * @port: Master port to issue transaction
273 * @src_ops: RIO device source operations
274 * @dst_ops: RIO device destination operations
275 *
276 * Checks the provided @src_ops and @dst_ops for the necessary transaction
277 * capabilities that indicate whether or not a device will implement a
278 * destination ID register. Returns 1 if true or 0 if false.
279 */
280static int rio_device_has_destid(struct rio_mport *port, int src_ops,
281 int dst_ops)
282{
283 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
284
285 return !!((src_ops | dst_ops) & mask);
286}
287
288/**
289 * rio_release_dev- Frees a RIO device struct
290 * @dev: LDM device associated with a RIO device struct
291 *
292 * Gets the RIO device struct associated a RIO device struct.
293 * The RIO device struct is freed.
294 */
295static void rio_release_dev(struct device *dev)
296{
297 struct rio_dev *rdev;
298
299 rdev = to_rio_dev(dev);
300 kfree(rdev);
301}
302
303/**
304 * rio_is_switch- Tests if a RIO device has switch capabilities
305 * @rdev: RIO device
306 *
307 * Gets the RIO device Processing Element Features register
308 * contents and tests for switch capabilities. Returns 1 if
309 * the device is a switch or 0 if it is not a switch.
310 * The RIO device struct is freed.
311 */
312static int rio_is_switch(struct rio_dev *rdev)
313{
314 if (rdev->pef & RIO_PEF_SWITCH)
315 return 1;
316 return 0;
317}
318
319/**
320 * rio_setup_device- Allocates and sets up a RIO device
321 * @net: RIO network
322 * @port: Master port to send transactions
323 * @destid: Current destination ID
324 * @hopcount: Current hopcount
325 * @do_enum: Enumeration/Discovery mode flag
326 *
327 * Allocates a RIO device and configures fields based on configuration
328 * space contents. If device has a destination ID register, a destination
329 * ID is either assigned in enumeration mode or read from configuration
330 * space in discovery mode. If the device has switch capabilities, then
331 * a switch is allocated and configured appropriately. Returns a pointer
332 * to a RIO device on success or NULL on failure.
333 *
334 */
335static struct rio_dev *rio_setup_device(struct rio_net *net,
336 struct rio_mport *port, u16 destid,
337 u8 hopcount, int do_enum)
338{
339 int ret = 0;
340 struct rio_dev *rdev;
341 struct rio_switch *rswitch = NULL;
342 int result, rdid;
343 size_t size;
344 u32 swpinfo = 0;
345
346 size = sizeof(struct rio_dev);
347 if (rio_mport_read_config_32(port, destid, hopcount,
348 RIO_PEF_CAR, &result))
349 return NULL;
350
351 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
352 rio_mport_read_config_32(port, destid, hopcount,
353 RIO_SWP_INFO_CAR, &swpinfo);
354 if (result & RIO_PEF_SWITCH) {
355 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
356 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
357 }
358 }
359
360 rdev = kzalloc(size, GFP_KERNEL);
361 if (!rdev)
362 return NULL;
363
364 rdev->net = net;
365 rdev->pef = result;
366 rdev->swpinfo = swpinfo;
367 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
368 &result);
369 rdev->did = result >> 16;
370 rdev->vid = result & 0xffff;
371 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
372 &rdev->device_rev);
373 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
374 &result);
375 rdev->asm_did = result >> 16;
376 rdev->asm_vid = result & 0xffff;
377 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
378 &result);
379 rdev->asm_rev = result >> 16;
380 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
381 rdev->efptr = result & 0xffff;
382 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
383 hopcount);
384
385 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
386 hopcount, RIO_EFB_ERR_MGMNT);
387 }
388
389 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
390 &rdev->src_ops);
391 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
392 &rdev->dst_ops);
393
394 if (do_enum) {
395 /* Assign component tag to device */
396 if (next_comptag >= 0x10000) {
397 pr_err("RIO: Component Tag Counter Overflow\n");
398 goto cleanup;
399 }
400 rio_mport_write_config_32(port, destid, hopcount,
401 RIO_COMPONENT_TAG_CSR, next_comptag);
402 rdev->comp_tag = next_comptag++;
403 rdev->do_enum = true;
404 } else {
405 rio_mport_read_config_32(port, destid, hopcount,
406 RIO_COMPONENT_TAG_CSR,
407 &rdev->comp_tag);
408 }
409
410 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
411 if (do_enum) {
412 rio_set_device_id(port, destid, hopcount, next_destid);
413 rdev->destid = next_destid;
414 next_destid = rio_destid_alloc(net);
415 } else
416 rdev->destid = rio_get_device_id(port, destid, hopcount);
417
418 rdev->hopcount = 0xff;
419 } else {
420 /* Switch device has an associated destID which
421 * will be adjusted later
422 */
423 rdev->destid = destid;
424 rdev->hopcount = hopcount;
425 }
426
427 /* If a PE has both switch and other functions, show it as a switch */
428 if (rio_is_switch(rdev)) {
429 rswitch = rdev->rswitch;
430 rswitch->port_ok = 0;
431 spin_lock_init(&rswitch->lock);
432 rswitch->route_table = kzalloc(sizeof(u8)*
433 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
434 GFP_KERNEL);
435 if (!rswitch->route_table)
436 goto cleanup;
437 /* Initialize switch route table */
438 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
439 rdid++)
440 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
441 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
442 rdev->comp_tag & RIO_CTAG_UDEVID);
443
444 if (do_enum)
445 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
446 } else {
447 if (do_enum)
448 /*Enable Input Output Port (transmitter reviever)*/
449 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
450
451 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
452 rdev->comp_tag & RIO_CTAG_UDEVID);
453 }
454
455 rdev->dev.parent = &net->dev;
456 rio_attach_device(rdev);
457 rdev->dev.release = rio_release_dev;
458 rdev->dma_mask = DMA_BIT_MASK(32);
459 rdev->dev.dma_mask = &rdev->dma_mask;
460 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
461
462 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
463 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
464 0, 0xffff);
465
466 ret = rio_add_device(rdev);
467 if (ret)
468 goto cleanup;
469
470 rio_dev_get(rdev);
471
472 return rdev;
473
474cleanup:
475 if (rswitch)
476 kfree(rswitch->route_table);
477
478 kfree(rdev);
479 return NULL;
480}
481
482/**
483 * rio_sport_is_active- Tests if a switch port has an active connection.
484 * @port: Master port to send transaction
485 * @destid: Associated destination ID for switch
486 * @hopcount: Hopcount to reach switch
487 * @sport: Switch port number
488 *
489 * Reads the port error status CSR for a particular switch port to
490 * determine if the port has an active link. Returns
491 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
492 * inactive.
493 */
494static int
495rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
496{
497 u32 result = 0;
498 u32 ext_ftr_ptr;
499
500 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
501
502 while (ext_ftr_ptr) {
503 rio_mport_read_config_32(port, destid, hopcount,
504 ext_ftr_ptr, &result);
505 result = RIO_GET_BLOCK_ID(result);
506 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
507 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
508 (result == RIO_EFB_SER_EP_FREC_ID))
509 break;
510
511 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
512 ext_ftr_ptr);
513 }
514
515 if (ext_ftr_ptr)
516 rio_mport_read_config_32(port, destid, hopcount,
517 ext_ftr_ptr +
518 RIO_PORT_N_ERR_STS_CSR(sport),
519 &result);
520
521 return result & RIO_PORT_N_ERR_STS_PORT_OK;
522}
523
524/**
525 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
526 * @port: Master port to send transaction
527 * @hopcount: Number of hops to the device
528 *
529 * Used during enumeration to read the Host Device ID Lock CSR on a
530 * RIO device. Returns the value of the lock register.
531 */
532static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
533{
534 u32 result;
535
536 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
537 RIO_HOST_DID_LOCK_CSR, &result);
538
539 return (u16) (result & 0xffff);
540}
541
542/**
543 * rio_enum_peer- Recursively enumerate a RIO network through a master port
544 * @net: RIO network being enumerated
545 * @port: Master port to send transactions
546 * @hopcount: Number of hops into the network
547 * @prev: Previous RIO device connected to the enumerated one
548 * @prev_port: Port on previous RIO device
549 *
550 * Recursively enumerates a RIO network. Transactions are sent via the
551 * master port passed in @port.
552 */
553static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
554 u8 hopcount, struct rio_dev *prev, int prev_port)
555{
556 struct rio_dev *rdev;
557 u32 regval;
558 int tmp;
559
560 if (rio_mport_chk_dev_access(port,
561 RIO_ANY_DESTID(port->sys_size), hopcount)) {
562 pr_debug("RIO: device access check failed\n");
563 return -1;
564 }
565
566 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
567 pr_debug("RIO: PE already discovered by this host\n");
568 /*
569 * Already discovered by this host. Add it as another
570 * link to the existing device.
571 */
572 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
573 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
574
575 if (regval) {
576 rdev = rio_get_comptag((regval & 0xffff), NULL);
577
578 if (rdev && prev && rio_is_switch(prev)) {
579 pr_debug("RIO: redundant path to %s\n",
580 rio_name(rdev));
581 prev->rswitch->nextdev[prev_port] = rdev;
582 }
583 }
584
585 return 0;
586 }
587
588 /* Attempt to acquire device lock */
589 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
590 hopcount,
591 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
592 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
593 < port->host_deviceid) {
594 /* Delay a bit */
595 mdelay(1);
596 /* Attempt to acquire device lock again */
597 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
598 hopcount,
599 RIO_HOST_DID_LOCK_CSR,
600 port->host_deviceid);
601 }
602
603 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
604 pr_debug(
605 "RIO: PE locked by a higher priority host...retreating\n");
606 return -1;
607 }
608
609 /* Setup new RIO device */
610 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
611 hopcount, 1);
612 if (rdev) {
613 rdev->prev = prev;
614 if (prev && rio_is_switch(prev))
615 prev->rswitch->nextdev[prev_port] = rdev;
616 } else
617 return -1;
618
619 if (rio_is_switch(rdev)) {
620 int sw_destid;
621 int cur_destid;
622 int sw_inport;
623 u16 destid;
624 int port_num;
625
626 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
627 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
628 port->host_deviceid, sw_inport, 0);
629 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
630
631 destid = rio_destid_first(net);
632 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
633 if (destid != port->host_deviceid) {
634 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
635 destid, sw_inport, 0);
636 rdev->rswitch->route_table[destid] = sw_inport;
637 }
638 destid = rio_destid_next(net, destid + 1);
639 }
640 pr_debug(
641 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
642 rio_name(rdev), rdev->vid, rdev->did,
643 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
644 sw_destid = next_destid;
645 for (port_num = 0;
646 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
647 port_num++) {
648 if (sw_inport == port_num) {
649 rio_enable_rx_tx_port(port, 0,
650 RIO_ANY_DESTID(port->sys_size),
651 hopcount, port_num);
652 rdev->rswitch->port_ok |= (1 << port_num);
653 continue;
654 }
655
656 cur_destid = next_destid;
657
658 if (rio_sport_is_active
659 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
660 port_num)) {
661 pr_debug(
662 "RIO: scanning device on port %d\n",
663 port_num);
664 rio_enable_rx_tx_port(port, 0,
665 RIO_ANY_DESTID(port->sys_size),
666 hopcount, port_num);
667 rdev->rswitch->port_ok |= (1 << port_num);
668 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
669 RIO_ANY_DESTID(port->sys_size),
670 port_num, 0);
671
672 if (rio_enum_peer(net, port, hopcount + 1,
673 rdev, port_num) < 0)
674 return -1;
675
676 /* Update routing tables */
677 destid = rio_destid_next(net, cur_destid + 1);
678 if (destid != RIO_INVALID_DESTID) {
679 for (destid = cur_destid;
680 destid < next_destid;) {
681 if (destid != port->host_deviceid) {
682 rio_route_add_entry(rdev,
683 RIO_GLOBAL_TABLE,
684 destid,
685 port_num,
686 0);
687 rdev->rswitch->
688 route_table[destid] =
689 port_num;
690 }
691 destid = rio_destid_next(net,
692 destid + 1);
693 }
694 }
695 } else {
696 /* If switch supports Error Management,
697 * set PORT_LOCKOUT bit for unused port
698 */
699 if (rdev->em_efptr)
700 rio_set_port_lockout(rdev, port_num, 1);
701
702 rdev->rswitch->port_ok &= ~(1 << port_num);
703 }
704 }
705
706 /* Direct Port-write messages to the enumeratiing host */
707 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
708 (rdev->em_efptr)) {
709 rio_write_config_32(rdev,
710 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
711 (port->host_deviceid << 16) |
712 (port->sys_size << 15));
713 }
714
715 rio_init_em(rdev);
716
717 /* Check for empty switch */
718 if (next_destid == sw_destid)
719 next_destid = rio_destid_alloc(net);
720
721 rdev->destid = sw_destid;
722 } else
723 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
724 rio_name(rdev), rdev->vid, rdev->did);
725
726 return 0;
727}
728
729/**
730 * rio_enum_complete- Tests if enumeration of a network is complete
731 * @port: Master port to send transaction
732 *
733 * Tests the PGCCSR discovered bit for non-zero value (enumeration
734 * complete flag). Return %1 if enumeration is complete or %0 if
735 * enumeration is incomplete.
736 */
737static int rio_enum_complete(struct rio_mport *port)
738{
739 u32 regval;
740
741 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
742 ®val);
743 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
744}
745
746/**
747 * rio_disc_peer- Recursively discovers a RIO network through a master port
748 * @net: RIO network being discovered
749 * @port: Master port to send transactions
750 * @destid: Current destination ID in network
751 * @hopcount: Number of hops into the network
752 * @prev: previous rio_dev
753 * @prev_port: previous port number
754 *
755 * Recursively discovers a RIO network. Transactions are sent via the
756 * master port passed in @port.
757 */
758static int
759rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
760 u8 hopcount, struct rio_dev *prev, int prev_port)
761{
762 u8 port_num, route_port;
763 struct rio_dev *rdev;
764 u16 ndestid;
765
766 /* Setup new RIO device */
767 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
768 rdev->prev = prev;
769 if (prev && rio_is_switch(prev))
770 prev->rswitch->nextdev[prev_port] = rdev;
771 } else
772 return -1;
773
774 if (rio_is_switch(rdev)) {
775 /* Associated destid is how we accessed this switch */
776 rdev->destid = destid;
777
778 pr_debug(
779 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
780 rio_name(rdev), rdev->vid, rdev->did,
781 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
782 for (port_num = 0;
783 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
784 port_num++) {
785 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
786 continue;
787
788 if (rio_sport_is_active
789 (port, destid, hopcount, port_num)) {
790 pr_debug(
791 "RIO: scanning device on port %d\n",
792 port_num);
793
794 rio_lock_device(port, destid, hopcount, 1000);
795
796 for (ndestid = 0;
797 ndestid < RIO_ANY_DESTID(port->sys_size);
798 ndestid++) {
799 rio_route_get_entry(rdev,
800 RIO_GLOBAL_TABLE,
801 ndestid,
802 &route_port, 0);
803 if (route_port == port_num)
804 break;
805 }
806
807 if (ndestid == RIO_ANY_DESTID(port->sys_size))
808 continue;
809 rio_unlock_device(port, destid, hopcount);
810 if (rio_disc_peer(net, port, ndestid,
811 hopcount + 1, rdev, port_num) < 0)
812 return -1;
813 }
814 }
815 } else
816 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
817 rio_name(rdev), rdev->vid, rdev->did);
818
819 return 0;
820}
821
822/**
823 * rio_mport_is_active- Tests if master port link is active
824 * @port: Master port to test
825 *
826 * Reads the port error status CSR for the master port to
827 * determine if the port has an active link. Returns
828 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
829 * or %0 if it is inactive.
830 */
831static int rio_mport_is_active(struct rio_mport *port)
832{
833 u32 result = 0;
834 u32 ext_ftr_ptr;
835 int *entry = rio_mport_phys_table;
836
837 do {
838 if ((ext_ftr_ptr =
839 rio_mport_get_feature(port, 1, 0, 0, *entry)))
840 break;
841 } while (*++entry >= 0);
842
843 if (ext_ftr_ptr)
844 rio_local_read_config_32(port,
845 ext_ftr_ptr +
846 RIO_PORT_N_ERR_STS_CSR(port->index),
847 &result);
848
849 return result & RIO_PORT_N_ERR_STS_PORT_OK;
850}
851
852static void rio_scan_release_net(struct rio_net *net)
853{
854 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
855 kfree(net->enum_data);
856}
857
858static void rio_scan_release_dev(struct device *dev)
859{
860 struct rio_net *net;
861
862 net = to_rio_net(dev);
863 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
864 kfree(net);
865}
866
867/*
868 * rio_scan_alloc_net - Allocate and configure a new RIO network
869 * @mport: Master port associated with the RIO network
870 * @do_enum: Enumeration/Discovery mode flag
871 * @start: logical minimal start id for new net
872 *
873 * Allocates a new RIO network structure and initializes enumerator-specific
874 * part of it (if required).
875 * Returns a RIO network pointer on success or %NULL on failure.
876 */
877static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
878 int do_enum, u16 start)
879{
880 struct rio_net *net;
881
882 net = rio_alloc_net(mport);
883
884 if (net && do_enum) {
885 struct rio_id_table *idtab;
886 size_t size;
887
888 size = sizeof(struct rio_id_table) +
889 BITS_TO_LONGS(
890 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
891 ) * sizeof(long);
892
893 idtab = kzalloc(size, GFP_KERNEL);
894
895 if (idtab == NULL) {
896 pr_err("RIO: failed to allocate destID table\n");
897 rio_free_net(net);
898 net = NULL;
899 } else {
900 net->enum_data = idtab;
901 net->release = rio_scan_release_net;
902 idtab->start = start;
903 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
904 spin_lock_init(&idtab->lock);
905 }
906 }
907
908 if (net) {
909 net->id = mport->id;
910 net->hport = mport;
911 dev_set_name(&net->dev, "rnet_%d", net->id);
912 net->dev.parent = &mport->dev;
913 net->dev.release = rio_scan_release_dev;
914 rio_add_net(net);
915 }
916
917 return net;
918}
919
920/**
921 * rio_update_route_tables- Updates route tables in switches
922 * @net: RIO network to run update on
923 *
924 * For each enumerated device, ensure that each switch in a system
925 * has correct routing entries. Add routes for devices that where
926 * unknown dirung the first enumeration pass through the switch.
927 */
928static void rio_update_route_tables(struct rio_net *net)
929{
930 struct rio_dev *rdev, *swrdev;
931 struct rio_switch *rswitch;
932 u8 sport;
933 u16 destid;
934
935 list_for_each_entry(rdev, &net->devices, net_list) {
936
937 destid = rdev->destid;
938
939 list_for_each_entry(rswitch, &net->switches, node) {
940
941 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
942 continue;
943
944 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
945 swrdev = sw_to_rio_dev(rswitch);
946
947 /* Skip if destid ends in empty switch*/
948 if (swrdev->destid == destid)
949 continue;
950
951 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
952
953 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
954 destid, sport, 0);
955 rswitch->route_table[destid] = sport;
956 }
957 }
958 }
959}
960
961/**
962 * rio_init_em - Initializes RIO Error Management (for switches)
963 * @rdev: RIO device
964 *
965 * For each enumerated switch, call device-specific error management
966 * initialization routine (if supplied by the switch driver).
967 */
968static void rio_init_em(struct rio_dev *rdev)
969{
970 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
971 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
972 rdev->rswitch->ops->em_init(rdev);
973 }
974}
975
976/**
977 * rio_enum_mport- Start enumeration through a master port
978 * @mport: Master port to send transactions
979 * @flags: Enumeration control flags
980 *
981 * Starts the enumeration process. If somebody has enumerated our
982 * master port device, then give up. If not and we have an active
983 * link, then start recursive peer enumeration. Returns %0 if
984 * enumeration succeeds or %-EBUSY if enumeration fails.
985 */
986static int rio_enum_mport(struct rio_mport *mport, u32 flags)
987{
988 struct rio_net *net = NULL;
989 int rc = 0;
990
991 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
992 mport->name);
993
994 /*
995 * To avoid multiple start requests (repeat enumeration is not supported
996 * by this method) check if enumeration/discovery was performed for this
997 * mport: if mport was added into the list of mports for a net exit
998 * with error.
999 */
1000 if (mport->nnode.next || mport->nnode.prev)
1001 return -EBUSY;
1002
1003 /* If somebody else enumerated our master port device, bail. */
1004 if (rio_enum_host(mport) < 0) {
1005 printk(KERN_INFO
1006 "RIO: master port %d device has been enumerated by a remote host\n",
1007 mport->id);
1008 rc = -EBUSY;
1009 goto out;
1010 }
1011
1012 /* If master port has an active link, allocate net and enum peers */
1013 if (rio_mport_is_active(mport)) {
1014 net = rio_scan_alloc_net(mport, 1, 0);
1015 if (!net) {
1016 printk(KERN_ERR "RIO: failed to allocate new net\n");
1017 rc = -ENOMEM;
1018 goto out;
1019 }
1020
1021 /* reserve mport destID in new net */
1022 rio_destid_reserve(net, mport->host_deviceid);
1023
1024 /* Enable Input Output Port (transmitter reviever) */
1025 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1026
1027 /* Set component tag for host */
1028 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1029 next_comptag++);
1030
1031 next_destid = rio_destid_alloc(net);
1032
1033 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1034 /* A higher priority host won enumeration, bail. */
1035 printk(KERN_INFO
1036 "RIO: master port %d device has lost enumeration to a remote host\n",
1037 mport->id);
1038 rio_clear_locks(net);
1039 rc = -EBUSY;
1040 goto out;
1041 }
1042 /* free the last allocated destID (unused) */
1043 rio_destid_free(net, next_destid);
1044 rio_update_route_tables(net);
1045 rio_clear_locks(net);
1046 rio_pw_enable(mport, 1);
1047 } else {
1048 printk(KERN_INFO "RIO: master port %d link inactive\n",
1049 mport->id);
1050 rc = -EINVAL;
1051 }
1052
1053 out:
1054 return rc;
1055}
1056
1057/**
1058 * rio_build_route_tables- Generate route tables from switch route entries
1059 * @net: RIO network to run route tables scan on
1060 *
1061 * For each switch device, generate a route table by copying existing
1062 * route entries from the switch.
1063 */
1064static void rio_build_route_tables(struct rio_net *net)
1065{
1066 struct rio_switch *rswitch;
1067 struct rio_dev *rdev;
1068 int i;
1069 u8 sport;
1070
1071 list_for_each_entry(rswitch, &net->switches, node) {
1072 rdev = sw_to_rio_dev(rswitch);
1073
1074 rio_lock_device(net->hport, rdev->destid,
1075 rdev->hopcount, 1000);
1076 for (i = 0;
1077 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1078 i++) {
1079 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1080 i, &sport, 0) < 0)
1081 continue;
1082 rswitch->route_table[i] = sport;
1083 }
1084
1085 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1086 }
1087}
1088
1089/**
1090 * rio_disc_mport- Start discovery through a master port
1091 * @mport: Master port to send transactions
1092 * @flags: discovery control flags
1093 *
1094 * Starts the discovery process. If we have an active link,
1095 * then wait for the signal that enumeration is complete (if wait
1096 * is allowed).
1097 * When enumeration completion is signaled, start recursive
1098 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1099 * on failure.
1100 */
1101static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1102{
1103 struct rio_net *net = NULL;
1104 unsigned long to_end;
1105
1106 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1107 mport->name);
1108
1109 /* If master port has an active link, allocate net and discover peers */
1110 if (rio_mport_is_active(mport)) {
1111 if (rio_enum_complete(mport))
1112 goto enum_done;
1113 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1114 return -EAGAIN;
1115
1116 pr_debug("RIO: wait for enumeration to complete...\n");
1117
1118 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1119 while (time_before(jiffies, to_end)) {
1120 if (rio_enum_complete(mport))
1121 goto enum_done;
1122 msleep(10);
1123 }
1124
1125 pr_debug("RIO: discovery timeout on mport %d %s\n",
1126 mport->id, mport->name);
1127 goto bail;
1128enum_done:
1129 pr_debug("RIO: ... enumeration done\n");
1130
1131 net = rio_scan_alloc_net(mport, 0, 0);
1132 if (!net) {
1133 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1134 goto bail;
1135 }
1136
1137 /* Read DestID assigned by enumerator */
1138 rio_local_read_config_32(mport, RIO_DID_CSR,
1139 &mport->host_deviceid);
1140 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1141 mport->host_deviceid);
1142
1143 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1144 0, NULL, 0) < 0) {
1145 printk(KERN_INFO
1146 "RIO: master port %d device has failed discovery\n",
1147 mport->id);
1148 goto bail;
1149 }
1150
1151 rio_build_route_tables(net);
1152 }
1153
1154 return 0;
1155bail:
1156 return -EBUSY;
1157}
1158
1159static struct rio_scan rio_scan_ops = {
1160 .owner = THIS_MODULE,
1161 .enumerate = rio_enum_mport,
1162 .discover = rio_disc_mport,
1163};
1164
1165static bool scan;
1166module_param(scan, bool, 0);
1167MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1168 "(default = 0)");
1169
1170/**
1171 * rio_basic_attach:
1172 *
1173 * When this enumeration/discovery method is loaded as a module this function
1174 * registers its specific enumeration and discover routines for all available
1175 * RapidIO mport devices. The "scan" command line parameter controls ability of
1176 * the module to start RapidIO enumeration/discovery automatically.
1177 *
1178 * Returns 0 for success or -EIO if unable to register itself.
1179 *
1180 * This enumeration/discovery method cannot be unloaded and therefore does not
1181 * provide a matching cleanup_module routine.
1182 */
1183
1184static int __init rio_basic_attach(void)
1185{
1186 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1187 return -EIO;
1188 if (scan)
1189 rio_init_mports();
1190 return 0;
1191}
1192
1193late_initcall(rio_basic_attach);
1194
1195MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1196MODULE_LICENSE("GPL");
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
36static void rio_init_em(struct rio_dev *rdev);
37
38struct 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
45static int next_destid = 0;
46static 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 */
56static 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 */
82static 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 */
101static 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 */
115static 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 */
135static 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 */
159static 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 */
177static 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 */
191static 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 */
240static 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 */
267static 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 */
282static 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 */
299static 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 */
322static 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
468cleanup:
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 */
486static int
487rio_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 */
505static 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 */
526static 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 */
708static 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 */
729static int
730rio_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 */
801static 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
812static 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
818static 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 */
837static 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 */
888static 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 */
928static 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 */
946static 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 */
1024static 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 */
1061static 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;
1088enum_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;
1115bail:
1116 return -EBUSY;
1117}
1118
1119static struct rio_scan rio_scan_ops = {
1120 .owner = THIS_MODULE,
1121 .enumerate = rio_enum_mport,
1122 .discover = rio_disc_mport,
1123};
1124
1125static bool scan;
1126module_param(scan, bool, 0);
1127MODULE_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
1144static 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
1153late_initcall(rio_basic_attach);
1154
1155MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1156MODULE_LICENSE("GPL");