Loading...
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[0];
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(struct rio_dev);
334 if (rio_mport_read_config_32(port, destid, hopcount,
335 RIO_PEF_CAR, &result))
336 return NULL;
337
338 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
339 rio_mport_read_config_32(port, destid, hopcount,
340 RIO_SWP_INFO_CAR, &swpinfo);
341 if (result & RIO_PEF_SWITCH) {
342 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
343 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
344 }
345 }
346
347 rdev = kzalloc(size, GFP_KERNEL);
348 if (!rdev)
349 return NULL;
350
351 rdev->net = net;
352 rdev->pef = result;
353 rdev->swpinfo = swpinfo;
354 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
355 &result);
356 rdev->did = result >> 16;
357 rdev->vid = result & 0xffff;
358 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
359 &rdev->device_rev);
360 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
361 &result);
362 rdev->asm_did = result >> 16;
363 rdev->asm_vid = result & 0xffff;
364 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
365 &result);
366 rdev->asm_rev = result >> 16;
367 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
368 rdev->efptr = result & 0xffff;
369 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
370 hopcount, &rdev->phys_rmap);
371 pr_debug("RIO: %s Register Map %d device\n",
372 __func__, rdev->phys_rmap);
373
374 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
375 hopcount, RIO_EFB_ERR_MGMNT);
376 if (!rdev->em_efptr)
377 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
378 hopcount, RIO_EFB_ERR_MGMNT_HS);
379 }
380
381 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
382 &rdev->src_ops);
383 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
384 &rdev->dst_ops);
385
386 if (do_enum) {
387 /* Assign component tag to device */
388 if (next_comptag >= 0x10000) {
389 pr_err("RIO: Component Tag Counter Overflow\n");
390 goto cleanup;
391 }
392 rio_mport_write_config_32(port, destid, hopcount,
393 RIO_COMPONENT_TAG_CSR, next_comptag);
394 rdev->comp_tag = next_comptag++;
395 rdev->do_enum = true;
396 } else {
397 rio_mport_read_config_32(port, destid, hopcount,
398 RIO_COMPONENT_TAG_CSR,
399 &rdev->comp_tag);
400 }
401
402 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
403 if (do_enum) {
404 rio_set_device_id(port, destid, hopcount, next_destid);
405 rdev->destid = next_destid;
406 next_destid = rio_destid_alloc(net);
407 } else
408 rdev->destid = rio_get_device_id(port, destid, hopcount);
409
410 rdev->hopcount = 0xff;
411 } else {
412 /* Switch device has an associated destID which
413 * will be adjusted later
414 */
415 rdev->destid = destid;
416 rdev->hopcount = hopcount;
417 }
418
419 /* If a PE has both switch and other functions, show it as a switch */
420 if (rio_is_switch(rdev)) {
421 rswitch = rdev->rswitch;
422 rswitch->port_ok = 0;
423 spin_lock_init(&rswitch->lock);
424 rswitch->route_table =
425 kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size),
426 GFP_KERNEL);
427 if (!rswitch->route_table)
428 goto cleanup;
429 /* Initialize switch route table */
430 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
431 rdid++)
432 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
433 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
434 rdev->comp_tag & RIO_CTAG_UDEVID);
435
436 if (do_enum)
437 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
438 } else {
439 if (do_enum)
440 /*Enable Input Output Port (transmitter receiver)*/
441 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
442
443 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
444 rdev->comp_tag & RIO_CTAG_UDEVID);
445 }
446
447 rdev->dev.parent = &net->dev;
448 rio_attach_device(rdev);
449 rdev->dev.release = rio_release_dev;
450 rdev->dma_mask = DMA_BIT_MASK(32);
451 rdev->dev.dma_mask = &rdev->dma_mask;
452 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
453
454 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
455 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
456 0, 0xffff);
457
458 ret = rio_add_device(rdev);
459 if (ret)
460 goto cleanup;
461
462 rio_dev_get(rdev);
463
464 return rdev;
465
466cleanup:
467 if (rswitch)
468 kfree(rswitch->route_table);
469
470 kfree(rdev);
471 return NULL;
472}
473
474/**
475 * rio_sport_is_active- Tests if a switch port has an active connection.
476 * @rdev: RapidIO device object
477 * @sp: Switch port number
478 *
479 * Reads the port error status CSR for a particular switch port to
480 * determine if the port has an active link. Returns
481 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
482 * inactive.
483 */
484static int
485rio_sport_is_active(struct rio_dev *rdev, int sp)
486{
487 u32 result = 0;
488
489 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
490 &result);
491
492 return result & RIO_PORT_N_ERR_STS_PORT_OK;
493}
494
495/**
496 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
497 * @port: Master port to send transaction
498 * @hopcount: Number of hops to the device
499 *
500 * Used during enumeration to read the Host Device ID Lock CSR on a
501 * RIO device. Returns the value of the lock register.
502 */
503static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
504{
505 u32 result;
506
507 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
508 RIO_HOST_DID_LOCK_CSR, &result);
509
510 return (u16) (result & 0xffff);
511}
512
513/**
514 * rio_enum_peer- Recursively enumerate a RIO network through a master port
515 * @net: RIO network being enumerated
516 * @port: Master port to send transactions
517 * @hopcount: Number of hops into the network
518 * @prev: Previous RIO device connected to the enumerated one
519 * @prev_port: Port on previous RIO device
520 *
521 * Recursively enumerates a RIO network. Transactions are sent via the
522 * master port passed in @port.
523 */
524static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
525 u8 hopcount, struct rio_dev *prev, int prev_port)
526{
527 struct rio_dev *rdev;
528 u32 regval;
529 int tmp;
530
531 if (rio_mport_chk_dev_access(port,
532 RIO_ANY_DESTID(port->sys_size), hopcount)) {
533 pr_debug("RIO: device access check failed\n");
534 return -1;
535 }
536
537 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
538 pr_debug("RIO: PE already discovered by this host\n");
539 /*
540 * Already discovered by this host. Add it as another
541 * link to the existing device.
542 */
543 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
544 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
545
546 if (regval) {
547 rdev = rio_get_comptag((regval & 0xffff), NULL);
548
549 if (rdev && prev && rio_is_switch(prev)) {
550 pr_debug("RIO: redundant path to %s\n",
551 rio_name(rdev));
552 prev->rswitch->nextdev[prev_port] = rdev;
553 }
554 }
555
556 return 0;
557 }
558
559 /* Attempt to acquire device lock */
560 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
561 hopcount,
562 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
563 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
564 < port->host_deviceid) {
565 /* Delay a bit */
566 mdelay(1);
567 /* Attempt to acquire device lock again */
568 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
569 hopcount,
570 RIO_HOST_DID_LOCK_CSR,
571 port->host_deviceid);
572 }
573
574 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
575 pr_debug(
576 "RIO: PE locked by a higher priority host...retreating\n");
577 return -1;
578 }
579
580 /* Setup new RIO device */
581 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
582 hopcount, 1);
583 if (rdev) {
584 rdev->prev = prev;
585 if (prev && rio_is_switch(prev))
586 prev->rswitch->nextdev[prev_port] = rdev;
587 } else
588 return -1;
589
590 if (rio_is_switch(rdev)) {
591 int sw_destid;
592 int cur_destid;
593 int sw_inport;
594 u16 destid;
595 int port_num;
596
597 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
598 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
599 port->host_deviceid, sw_inport, 0);
600 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
601
602 destid = rio_destid_first(net);
603 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
604 if (destid != port->host_deviceid) {
605 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
606 destid, sw_inport, 0);
607 rdev->rswitch->route_table[destid] = sw_inport;
608 }
609 destid = rio_destid_next(net, destid + 1);
610 }
611 pr_debug(
612 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
613 rio_name(rdev), rdev->vid, rdev->did,
614 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
615 sw_destid = next_destid;
616 for (port_num = 0;
617 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
618 port_num++) {
619 if (sw_inport == port_num) {
620 rio_enable_rx_tx_port(port, 0,
621 RIO_ANY_DESTID(port->sys_size),
622 hopcount, port_num);
623 rdev->rswitch->port_ok |= (1 << port_num);
624 continue;
625 }
626
627 cur_destid = next_destid;
628
629 if (rio_sport_is_active(rdev, port_num)) {
630 pr_debug(
631 "RIO: scanning device on port %d\n",
632 port_num);
633 rio_enable_rx_tx_port(port, 0,
634 RIO_ANY_DESTID(port->sys_size),
635 hopcount, port_num);
636 rdev->rswitch->port_ok |= (1 << port_num);
637 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
638 RIO_ANY_DESTID(port->sys_size),
639 port_num, 0);
640
641 if (rio_enum_peer(net, port, hopcount + 1,
642 rdev, port_num) < 0)
643 return -1;
644
645 /* Update routing tables */
646 destid = rio_destid_next(net, cur_destid + 1);
647 if (destid != RIO_INVALID_DESTID) {
648 for (destid = cur_destid;
649 destid < next_destid;) {
650 if (destid != port->host_deviceid) {
651 rio_route_add_entry(rdev,
652 RIO_GLOBAL_TABLE,
653 destid,
654 port_num,
655 0);
656 rdev->rswitch->
657 route_table[destid] =
658 port_num;
659 }
660 destid = rio_destid_next(net,
661 destid + 1);
662 }
663 }
664 } else {
665 /* If switch supports Error Management,
666 * set PORT_LOCKOUT bit for unused port
667 */
668 if (rdev->em_efptr)
669 rio_set_port_lockout(rdev, port_num, 1);
670
671 rdev->rswitch->port_ok &= ~(1 << port_num);
672 }
673 }
674
675 /* Direct Port-write messages to the enumeratiing host */
676 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
677 (rdev->em_efptr)) {
678 rio_write_config_32(rdev,
679 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
680 (port->host_deviceid << 16) |
681 (port->sys_size << 15));
682 }
683
684 rio_init_em(rdev);
685
686 /* Check for empty switch */
687 if (next_destid == sw_destid)
688 next_destid = rio_destid_alloc(net);
689
690 rdev->destid = sw_destid;
691 } else
692 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
693 rio_name(rdev), rdev->vid, rdev->did);
694
695 return 0;
696}
697
698/**
699 * rio_enum_complete- Tests if enumeration of a network is complete
700 * @port: Master port to send transaction
701 *
702 * Tests the PGCCSR discovered bit for non-zero value (enumeration
703 * complete flag). Return %1 if enumeration is complete or %0 if
704 * enumeration is incomplete.
705 */
706static int rio_enum_complete(struct rio_mport *port)
707{
708 u32 regval;
709
710 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
711 ®val);
712 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
713}
714
715/**
716 * rio_disc_peer- Recursively discovers a RIO network through a master port
717 * @net: RIO network being discovered
718 * @port: Master port to send transactions
719 * @destid: Current destination ID in network
720 * @hopcount: Number of hops into the network
721 * @prev: previous rio_dev
722 * @prev_port: previous port number
723 *
724 * Recursively discovers a RIO network. Transactions are sent via the
725 * master port passed in @port.
726 */
727static int
728rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
729 u8 hopcount, struct rio_dev *prev, int prev_port)
730{
731 u8 port_num, route_port;
732 struct rio_dev *rdev;
733 u16 ndestid;
734
735 /* Setup new RIO device */
736 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
737 rdev->prev = prev;
738 if (prev && rio_is_switch(prev))
739 prev->rswitch->nextdev[prev_port] = rdev;
740 } else
741 return -1;
742
743 if (rio_is_switch(rdev)) {
744 /* Associated destid is how we accessed this switch */
745 rdev->destid = destid;
746
747 pr_debug(
748 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
749 rio_name(rdev), rdev->vid, rdev->did,
750 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
751 for (port_num = 0;
752 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
753 port_num++) {
754 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
755 continue;
756
757 if (rio_sport_is_active(rdev, port_num)) {
758 pr_debug(
759 "RIO: scanning device on port %d\n",
760 port_num);
761
762 rio_lock_device(port, destid, hopcount, 1000);
763
764 for (ndestid = 0;
765 ndestid < RIO_ANY_DESTID(port->sys_size);
766 ndestid++) {
767 rio_route_get_entry(rdev,
768 RIO_GLOBAL_TABLE,
769 ndestid,
770 &route_port, 0);
771 if (route_port == port_num)
772 break;
773 }
774
775 if (ndestid == RIO_ANY_DESTID(port->sys_size))
776 continue;
777 rio_unlock_device(port, destid, hopcount);
778 if (rio_disc_peer(net, port, ndestid,
779 hopcount + 1, rdev, port_num) < 0)
780 return -1;
781 }
782 }
783 } else
784 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
785 rio_name(rdev), rdev->vid, rdev->did);
786
787 return 0;
788}
789
790/**
791 * rio_mport_is_active- Tests if master port link is active
792 * @port: Master port to test
793 *
794 * Reads the port error status CSR for the master port to
795 * determine if the port has an active link. Returns
796 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
797 * or %0 if it is inactive.
798 */
799static int rio_mport_is_active(struct rio_mport *port)
800{
801 u32 result = 0;
802
803 rio_local_read_config_32(port,
804 port->phys_efptr +
805 RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
806 &result);
807 return result & RIO_PORT_N_ERR_STS_PORT_OK;
808}
809
810static void rio_scan_release_net(struct rio_net *net)
811{
812 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
813 kfree(net->enum_data);
814}
815
816static void rio_scan_release_dev(struct device *dev)
817{
818 struct rio_net *net;
819
820 net = to_rio_net(dev);
821 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
822 kfree(net);
823}
824
825/*
826 * rio_scan_alloc_net - Allocate and configure a new RIO network
827 * @mport: Master port associated with the RIO network
828 * @do_enum: Enumeration/Discovery mode flag
829 * @start: logical minimal start id for new net
830 *
831 * Allocates a new RIO network structure and initializes enumerator-specific
832 * part of it (if required).
833 * Returns a RIO network pointer on success or %NULL on failure.
834 */
835static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
836 int do_enum, u16 start)
837{
838 struct rio_net *net;
839
840 net = rio_alloc_net(mport);
841
842 if (net && do_enum) {
843 struct rio_id_table *idtab;
844 size_t size;
845
846 size = sizeof(struct rio_id_table) +
847 BITS_TO_LONGS(
848 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
849 ) * sizeof(long);
850
851 idtab = kzalloc(size, GFP_KERNEL);
852
853 if (idtab == NULL) {
854 pr_err("RIO: failed to allocate destID table\n");
855 rio_free_net(net);
856 net = NULL;
857 } else {
858 net->enum_data = idtab;
859 net->release = rio_scan_release_net;
860 idtab->start = start;
861 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
862 spin_lock_init(&idtab->lock);
863 }
864 }
865
866 if (net) {
867 net->id = mport->id;
868 net->hport = mport;
869 dev_set_name(&net->dev, "rnet_%d", net->id);
870 net->dev.parent = &mport->dev;
871 net->dev.release = rio_scan_release_dev;
872 rio_add_net(net);
873 }
874
875 return net;
876}
877
878/**
879 * rio_update_route_tables- Updates route tables in switches
880 * @net: RIO network to run update on
881 *
882 * For each enumerated device, ensure that each switch in a system
883 * has correct routing entries. Add routes for devices that where
884 * unknown during the first enumeration pass through the switch.
885 */
886static void rio_update_route_tables(struct rio_net *net)
887{
888 struct rio_dev *rdev, *swrdev;
889 struct rio_switch *rswitch;
890 u8 sport;
891 u16 destid;
892
893 list_for_each_entry(rdev, &net->devices, net_list) {
894
895 destid = rdev->destid;
896
897 list_for_each_entry(rswitch, &net->switches, node) {
898
899 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
900 continue;
901
902 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
903 swrdev = sw_to_rio_dev(rswitch);
904
905 /* Skip if destid ends in empty switch*/
906 if (swrdev->destid == destid)
907 continue;
908
909 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
910
911 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
912 destid, sport, 0);
913 rswitch->route_table[destid] = sport;
914 }
915 }
916 }
917}
918
919/**
920 * rio_init_em - Initializes RIO Error Management (for switches)
921 * @rdev: RIO device
922 *
923 * For each enumerated switch, call device-specific error management
924 * initialization routine (if supplied by the switch driver).
925 */
926static void rio_init_em(struct rio_dev *rdev)
927{
928 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
929 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
930 rdev->rswitch->ops->em_init(rdev);
931 }
932}
933
934/**
935 * rio_enum_mport- Start enumeration through a master port
936 * @mport: Master port to send transactions
937 * @flags: Enumeration control flags
938 *
939 * Starts the enumeration process. If somebody has enumerated our
940 * master port device, then give up. If not and we have an active
941 * link, then start recursive peer enumeration. Returns %0 if
942 * enumeration succeeds or %-EBUSY if enumeration fails.
943 */
944static int rio_enum_mport(struct rio_mport *mport, u32 flags)
945{
946 struct rio_net *net = NULL;
947 int rc = 0;
948
949 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
950 mport->name);
951
952 /*
953 * To avoid multiple start requests (repeat enumeration is not supported
954 * by this method) check if enumeration/discovery was performed for this
955 * mport: if mport was added into the list of mports for a net exit
956 * with error.
957 */
958 if (mport->nnode.next || mport->nnode.prev)
959 return -EBUSY;
960
961 /* If somebody else enumerated our master port device, bail. */
962 if (rio_enum_host(mport) < 0) {
963 printk(KERN_INFO
964 "RIO: master port %d device has been enumerated by a remote host\n",
965 mport->id);
966 rc = -EBUSY;
967 goto out;
968 }
969
970 /* If master port has an active link, allocate net and enum peers */
971 if (rio_mport_is_active(mport)) {
972 net = rio_scan_alloc_net(mport, 1, 0);
973 if (!net) {
974 printk(KERN_ERR "RIO: failed to allocate new net\n");
975 rc = -ENOMEM;
976 goto out;
977 }
978
979 /* reserve mport destID in new net */
980 rio_destid_reserve(net, mport->host_deviceid);
981
982 /* Enable Input Output Port (transmitter receiver) */
983 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
984
985 /* Set component tag for host */
986 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
987 next_comptag++);
988
989 next_destid = rio_destid_alloc(net);
990
991 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
992 /* A higher priority host won enumeration, bail. */
993 printk(KERN_INFO
994 "RIO: master port %d device has lost enumeration to a remote host\n",
995 mport->id);
996 rio_clear_locks(net);
997 rc = -EBUSY;
998 goto out;
999 }
1000 /* free the last allocated destID (unused) */
1001 rio_destid_free(net, next_destid);
1002 rio_update_route_tables(net);
1003 rio_clear_locks(net);
1004 rio_pw_enable(mport, 1);
1005 } else {
1006 printk(KERN_INFO "RIO: master port %d link inactive\n",
1007 mport->id);
1008 rc = -EINVAL;
1009 }
1010
1011 out:
1012 return rc;
1013}
1014
1015/**
1016 * rio_build_route_tables- Generate route tables from switch route entries
1017 * @net: RIO network to run route tables scan on
1018 *
1019 * For each switch device, generate a route table by copying existing
1020 * route entries from the switch.
1021 */
1022static void rio_build_route_tables(struct rio_net *net)
1023{
1024 struct rio_switch *rswitch;
1025 struct rio_dev *rdev;
1026 int i;
1027 u8 sport;
1028
1029 list_for_each_entry(rswitch, &net->switches, node) {
1030 rdev = sw_to_rio_dev(rswitch);
1031
1032 rio_lock_device(net->hport, rdev->destid,
1033 rdev->hopcount, 1000);
1034 for (i = 0;
1035 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1036 i++) {
1037 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1038 i, &sport, 0) < 0)
1039 continue;
1040 rswitch->route_table[i] = sport;
1041 }
1042
1043 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1044 }
1045}
1046
1047/**
1048 * rio_disc_mport- Start discovery through a master port
1049 * @mport: Master port to send transactions
1050 * @flags: discovery control flags
1051 *
1052 * Starts the discovery process. If we have an active link,
1053 * then wait for the signal that enumeration is complete (if wait
1054 * is allowed).
1055 * When enumeration completion is signaled, start recursive
1056 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1057 * on failure.
1058 */
1059static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1060{
1061 struct rio_net *net = NULL;
1062 unsigned long to_end;
1063
1064 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1065 mport->name);
1066
1067 /* If master port has an active link, allocate net and discover peers */
1068 if (rio_mport_is_active(mport)) {
1069 if (rio_enum_complete(mport))
1070 goto enum_done;
1071 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1072 return -EAGAIN;
1073
1074 pr_debug("RIO: wait for enumeration to complete...\n");
1075
1076 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1077 while (time_before(jiffies, to_end)) {
1078 if (rio_enum_complete(mport))
1079 goto enum_done;
1080 msleep(10);
1081 }
1082
1083 pr_debug("RIO: discovery timeout on mport %d %s\n",
1084 mport->id, mport->name);
1085 goto bail;
1086enum_done:
1087 pr_debug("RIO: ... enumeration done\n");
1088
1089 net = rio_scan_alloc_net(mport, 0, 0);
1090 if (!net) {
1091 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1092 goto bail;
1093 }
1094
1095 /* Read DestID assigned by enumerator */
1096 rio_local_read_config_32(mport, RIO_DID_CSR,
1097 &mport->host_deviceid);
1098 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1099 mport->host_deviceid);
1100
1101 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1102 0, NULL, 0) < 0) {
1103 printk(KERN_INFO
1104 "RIO: master port %d device has failed discovery\n",
1105 mport->id);
1106 goto bail;
1107 }
1108
1109 rio_build_route_tables(net);
1110 }
1111
1112 return 0;
1113bail:
1114 return -EBUSY;
1115}
1116
1117static struct rio_scan rio_scan_ops = {
1118 .owner = THIS_MODULE,
1119 .enumerate = rio_enum_mport,
1120 .discover = rio_disc_mport,
1121};
1122
1123static bool scan;
1124module_param(scan, bool, 0);
1125MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1126 "(default = 0)");
1127
1128/**
1129 * rio_basic_attach:
1130 *
1131 * When this enumeration/discovery method is loaded as a module this function
1132 * registers its specific enumeration and discover routines for all available
1133 * RapidIO mport devices. The "scan" command line parameter controls ability of
1134 * the module to start RapidIO enumeration/discovery automatically.
1135 *
1136 * Returns 0 for success or -EIO if unable to register itself.
1137 *
1138 * This enumeration/discovery method cannot be unloaded and therefore does not
1139 * provide a matching cleanup_module routine.
1140 */
1141
1142static int __init rio_basic_attach(void)
1143{
1144 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1145 return -EIO;
1146 if (scan)
1147 rio_init_mports();
1148 return 0;
1149}
1150
1151late_initcall(rio_basic_attach);
1152
1153MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1154MODULE_LICENSE("GPL");