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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/*
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/jiffies.h>
35#include <linux/slab.h>
36
37#include "rio.h"
38
39LIST_HEAD(rio_devices);
40static LIST_HEAD(rio_switches);
41
42static void rio_enum_timeout(unsigned long);
43
44static void rio_init_em(struct rio_dev *rdev);
45
46DEFINE_SPINLOCK(rio_global_list_lock);
47
48static int next_destid = 0;
49static int next_net = 0;
50static int next_comptag = 1;
51
52static struct timer_list rio_enum_timer =
53TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
54
55static int rio_mport_phys_table[] = {
56 RIO_EFB_PAR_EP_ID,
57 RIO_EFB_PAR_EP_REC_ID,
58 RIO_EFB_SER_EP_ID,
59 RIO_EFB_SER_EP_REC_ID,
60 -1,
61};
62
63/**
64 * rio_get_device_id - Get the base/extended device id for a device
65 * @port: RIO master port
66 * @destid: Destination ID of device
67 * @hopcount: Hopcount to device
68 *
69 * Reads the base/extended device id from a device. Returns the
70 * 8/16-bit device ID.
71 */
72static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
73{
74 u32 result;
75
76 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
77
78 return RIO_GET_DID(port->sys_size, result);
79}
80
81/**
82 * rio_set_device_id - Set the base/extended device id for a device
83 * @port: RIO master port
84 * @destid: Destination ID of device
85 * @hopcount: Hopcount to device
86 * @did: Device ID value to be written
87 *
88 * Writes the base/extended device id from a device.
89 */
90static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
91{
92 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
93 RIO_SET_DID(port->sys_size, did));
94}
95
96/**
97 * rio_local_set_device_id - Set the base/extended device id for a port
98 * @port: RIO master port
99 * @did: Device ID value to be written
100 *
101 * Writes the base/extended device id from a device.
102 */
103static void rio_local_set_device_id(struct rio_mport *port, u16 did)
104{
105 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
106 did));
107}
108
109/**
110 * rio_clear_locks- Release all host locks and signal enumeration complete
111 * @port: Master port to issue transaction
112 *
113 * Marks the component tag CSR on each device with the enumeration
114 * complete flag. When complete, it then release the host locks on
115 * each device. Returns 0 on success or %-EINVAL on failure.
116 */
117static int rio_clear_locks(struct rio_mport *port)
118{
119 struct rio_dev *rdev;
120 u32 result;
121 int ret = 0;
122
123 /* Release host device id locks */
124 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
125 port->host_deviceid);
126 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
127 if ((result & 0xffff) != 0xffff) {
128 printk(KERN_INFO
129 "RIO: badness when releasing host lock on master port, result %8.8x\n",
130 result);
131 ret = -EINVAL;
132 }
133 list_for_each_entry(rdev, &rio_devices, global_list) {
134 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
135 port->host_deviceid);
136 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
137 if ((result & 0xffff) != 0xffff) {
138 printk(KERN_INFO
139 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
140 rdev->vid, rdev->did);
141 ret = -EINVAL;
142 }
143
144 /* Mark device as discovered and enable master */
145 rio_read_config_32(rdev,
146 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
147 &result);
148 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
149 rio_write_config_32(rdev,
150 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
151 result);
152 }
153
154 return ret;
155}
156
157/**
158 * rio_enum_host- Set host lock and initialize host destination ID
159 * @port: Master port to issue transaction
160 *
161 * Sets the local host master port lock and destination ID register
162 * with the host device ID value. The host device ID value is provided
163 * by the platform. Returns %0 on success or %-1 on failure.
164 */
165static int rio_enum_host(struct rio_mport *port)
166{
167 u32 result;
168
169 /* Set master port host device id lock */
170 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
171 port->host_deviceid);
172
173 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
174 if ((result & 0xffff) != port->host_deviceid)
175 return -1;
176
177 /* Set master port destid and init destid ctr */
178 rio_local_set_device_id(port, port->host_deviceid);
179
180 if (next_destid == port->host_deviceid)
181 next_destid++;
182
183 return 0;
184}
185
186/**
187 * rio_device_has_destid- Test if a device contains a destination ID register
188 * @port: Master port to issue transaction
189 * @src_ops: RIO device source operations
190 * @dst_ops: RIO device destination operations
191 *
192 * Checks the provided @src_ops and @dst_ops for the necessary transaction
193 * capabilities that indicate whether or not a device will implement a
194 * destination ID register. Returns 1 if true or 0 if false.
195 */
196static int rio_device_has_destid(struct rio_mport *port, int src_ops,
197 int dst_ops)
198{
199 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;
200
201 return !!((src_ops | dst_ops) & mask);
202}
203
204/**
205 * rio_release_dev- Frees a RIO device struct
206 * @dev: LDM device associated with a RIO device struct
207 *
208 * Gets the RIO device struct associated a RIO device struct.
209 * The RIO device struct is freed.
210 */
211static void rio_release_dev(struct device *dev)
212{
213 struct rio_dev *rdev;
214
215 rdev = to_rio_dev(dev);
216 kfree(rdev);
217}
218
219/**
220 * rio_is_switch- Tests if a RIO device has switch capabilities
221 * @rdev: RIO device
222 *
223 * Gets the RIO device Processing Element Features register
224 * contents and tests for switch capabilities. Returns 1 if
225 * the device is a switch or 0 if it is not a switch.
226 * The RIO device struct is freed.
227 */
228static int rio_is_switch(struct rio_dev *rdev)
229{
230 if (rdev->pef & RIO_PEF_SWITCH)
231 return 1;
232 return 0;
233}
234
235/**
236 * rio_switch_init - Sets switch operations for a particular vendor switch
237 * @rdev: RIO device
238 * @do_enum: Enumeration/Discovery mode flag
239 *
240 * Searches the RIO switch ops table for known switch types. If the vid
241 * and did match a switch table entry, then call switch initialization
242 * routine to setup switch-specific routines.
243 */
244static void rio_switch_init(struct rio_dev *rdev, int do_enum)
245{
246 struct rio_switch_ops *cur = __start_rio_switch_ops;
247 struct rio_switch_ops *end = __end_rio_switch_ops;
248
249 while (cur < end) {
250 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
251 pr_debug("RIO: calling init routine for %s\n",
252 rio_name(rdev));
253 cur->init_hook(rdev, do_enum);
254 break;
255 }
256 cur++;
257 }
258
259 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
260 pr_debug("RIO: adding STD routing ops for %s\n",
261 rio_name(rdev));
262 rdev->rswitch->add_entry = rio_std_route_add_entry;
263 rdev->rswitch->get_entry = rio_std_route_get_entry;
264 rdev->rswitch->clr_table = rio_std_route_clr_table;
265 }
266
267 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
268 printk(KERN_ERR "RIO: missing routing ops for %s\n",
269 rio_name(rdev));
270}
271
272/**
273 * rio_add_device- Adds a RIO device to the device model
274 * @rdev: RIO device
275 *
276 * Adds the RIO device to the global device list and adds the RIO
277 * device to the RIO device list. Creates the generic sysfs nodes
278 * for an RIO device.
279 */
280static int __devinit rio_add_device(struct rio_dev *rdev)
281{
282 int err;
283
284 err = device_add(&rdev->dev);
285 if (err)
286 return err;
287
288 spin_lock(&rio_global_list_lock);
289 list_add_tail(&rdev->global_list, &rio_devices);
290 spin_unlock(&rio_global_list_lock);
291
292 rio_create_sysfs_dev_files(rdev);
293
294 return 0;
295}
296
297/**
298 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
299 * given port
300 * @port: Master port associated with the RIO network
301 * @local: local=1 select local port otherwise a far device is reached
302 * @destid: Destination ID of the device to check host bit
303 * @hopcount: Number of hops to reach the target
304 * @port_num: Port (-number on switch) to enable on a far end device
305 *
306 * Returns 0 or 1 from on General Control Command and Status Register
307 * (EXT_PTR+0x3C)
308 */
309inline int rio_enable_rx_tx_port(struct rio_mport *port,
310 int local, u16 destid,
311 u8 hopcount, u8 port_num) {
312#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
313 u32 regval;
314 u32 ext_ftr_ptr;
315
316 /*
317 * enable rx input tx output port
318 */
319 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
320 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
321
322 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
323
324 if (local) {
325 rio_local_read_config_32(port, ext_ftr_ptr +
326 RIO_PORT_N_CTL_CSR(0),
327 ®val);
328 } else {
329 if (rio_mport_read_config_32(port, destid, hopcount,
330 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
331 return -EIO;
332 }
333
334 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
335 /* serial */
336 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
337 | RIO_PORT_N_CTL_EN_TX_SER;
338 } else {
339 /* parallel */
340 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
341 | RIO_PORT_N_CTL_EN_TX_PAR;
342 }
343
344 if (local) {
345 rio_local_write_config_32(port, ext_ftr_ptr +
346 RIO_PORT_N_CTL_CSR(0), regval);
347 } else {
348 if (rio_mport_write_config_32(port, destid, hopcount,
349 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
350 return -EIO;
351 }
352#endif
353 return 0;
354}
355
356/**
357 * rio_setup_device- Allocates and sets up a RIO device
358 * @net: RIO network
359 * @port: Master port to send transactions
360 * @destid: Current destination ID
361 * @hopcount: Current hopcount
362 * @do_enum: Enumeration/Discovery mode flag
363 *
364 * Allocates a RIO device and configures fields based on configuration
365 * space contents. If device has a destination ID register, a destination
366 * ID is either assigned in enumeration mode or read from configuration
367 * space in discovery mode. If the device has switch capabilities, then
368 * a switch is allocated and configured appropriately. Returns a pointer
369 * to a RIO device on success or NULL on failure.
370 *
371 */
372static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
373 struct rio_mport *port, u16 destid,
374 u8 hopcount, int do_enum)
375{
376 int ret = 0;
377 struct rio_dev *rdev;
378 struct rio_switch *rswitch = NULL;
379 int result, rdid;
380 size_t size;
381 u32 swpinfo = 0;
382
383 size = sizeof(struct rio_dev);
384 if (rio_mport_read_config_32(port, destid, hopcount,
385 RIO_PEF_CAR, &result))
386 return NULL;
387
388 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
389 rio_mport_read_config_32(port, destid, hopcount,
390 RIO_SWP_INFO_CAR, &swpinfo);
391 if (result & RIO_PEF_SWITCH) {
392 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
393 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
394 }
395 }
396
397 rdev = kzalloc(size, GFP_KERNEL);
398 if (!rdev)
399 return NULL;
400
401 rdev->net = net;
402 rdev->pef = result;
403 rdev->swpinfo = swpinfo;
404 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
405 &result);
406 rdev->did = result >> 16;
407 rdev->vid = result & 0xffff;
408 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
409 &rdev->device_rev);
410 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
411 &result);
412 rdev->asm_did = result >> 16;
413 rdev->asm_vid = result & 0xffff;
414 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
415 &result);
416 rdev->asm_rev = result >> 16;
417 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
418 rdev->efptr = result & 0xffff;
419 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
420 hopcount);
421
422 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
423 hopcount, RIO_EFB_ERR_MGMNT);
424 }
425
426 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
427 &rdev->src_ops);
428 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
429 &rdev->dst_ops);
430
431 if (do_enum) {
432 /* Assign component tag to device */
433 if (next_comptag >= 0x10000) {
434 pr_err("RIO: Component Tag Counter Overflow\n");
435 goto cleanup;
436 }
437 rio_mport_write_config_32(port, destid, hopcount,
438 RIO_COMPONENT_TAG_CSR, next_comptag);
439 rdev->comp_tag = next_comptag++;
440 } else {
441 rio_mport_read_config_32(port, destid, hopcount,
442 RIO_COMPONENT_TAG_CSR,
443 &rdev->comp_tag);
444 }
445
446 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
447 if (do_enum) {
448 rio_set_device_id(port, destid, hopcount, next_destid);
449 rdev->destid = next_destid++;
450 if (next_destid == port->host_deviceid)
451 next_destid++;
452 } else
453 rdev->destid = rio_get_device_id(port, destid, hopcount);
454
455 rdev->hopcount = 0xff;
456 } else {
457 /* Switch device has an associated destID which
458 * will be adjusted later
459 */
460 rdev->destid = destid;
461 rdev->hopcount = hopcount;
462 }
463
464 /* If a PE has both switch and other functions, show it as a switch */
465 if (rio_is_switch(rdev)) {
466 rswitch = rdev->rswitch;
467 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
468 rswitch->port_ok = 0;
469 rswitch->route_table = kzalloc(sizeof(u8)*
470 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
471 GFP_KERNEL);
472 if (!rswitch->route_table)
473 goto cleanup;
474 /* Initialize switch route table */
475 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
476 rdid++)
477 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
478 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
479 rswitch->switchid);
480 rio_switch_init(rdev, do_enum);
481
482 if (do_enum && rswitch->clr_table)
483 rswitch->clr_table(port, destid, hopcount,
484 RIO_GLOBAL_TABLE);
485
486 list_add_tail(&rswitch->node, &rio_switches);
487
488 } else {
489 if (do_enum)
490 /*Enable Input Output Port (transmitter reviever)*/
491 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
492
493 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
494 rdev->destid);
495 }
496
497 rdev->dev.bus = &rio_bus_type;
498 rdev->dev.parent = &rio_bus;
499
500 device_initialize(&rdev->dev);
501 rdev->dev.release = rio_release_dev;
502 rio_dev_get(rdev);
503
504 rdev->dma_mask = DMA_BIT_MASK(32);
505 rdev->dev.dma_mask = &rdev->dma_mask;
506 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
507
508 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
509 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
510 0, 0xffff);
511
512 ret = rio_add_device(rdev);
513 if (ret)
514 goto cleanup;
515
516 return rdev;
517
518cleanup:
519 if (rswitch)
520 kfree(rswitch->route_table);
521
522 kfree(rdev);
523 return NULL;
524}
525
526/**
527 * rio_sport_is_active- Tests if a switch port has an active connection.
528 * @port: Master port to send transaction
529 * @destid: Associated destination ID for switch
530 * @hopcount: Hopcount to reach switch
531 * @sport: Switch port number
532 *
533 * Reads the port error status CSR for a particular switch port to
534 * determine if the port has an active link. Returns
535 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
536 * inactive.
537 */
538static int
539rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
540{
541 u32 result = 0;
542 u32 ext_ftr_ptr;
543
544 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
545
546 while (ext_ftr_ptr) {
547 rio_mport_read_config_32(port, destid, hopcount,
548 ext_ftr_ptr, &result);
549 result = RIO_GET_BLOCK_ID(result);
550 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
551 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
552 (result == RIO_EFB_SER_EP_FREC_ID))
553 break;
554
555 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
556 ext_ftr_ptr);
557 }
558
559 if (ext_ftr_ptr)
560 rio_mport_read_config_32(port, destid, hopcount,
561 ext_ftr_ptr +
562 RIO_PORT_N_ERR_STS_CSR(sport),
563 &result);
564
565 return result & RIO_PORT_N_ERR_STS_PORT_OK;
566}
567
568/**
569 * rio_lock_device - Acquires host device lock for specified device
570 * @port: Master port to send transaction
571 * @destid: Destination ID for device/switch
572 * @hopcount: Hopcount to reach switch
573 * @wait_ms: Max wait time in msec (0 = no timeout)
574 *
575 * Attepts to acquire host device lock for specified device
576 * Returns 0 if device lock acquired or EINVAL if timeout expires.
577 */
578static int
579rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
580{
581 u32 result;
582 int tcnt = 0;
583
584 /* Attempt to acquire device lock */
585 rio_mport_write_config_32(port, destid, hopcount,
586 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
587 rio_mport_read_config_32(port, destid, hopcount,
588 RIO_HOST_DID_LOCK_CSR, &result);
589
590 while (result != port->host_deviceid) {
591 if (wait_ms != 0 && tcnt == wait_ms) {
592 pr_debug("RIO: timeout when locking device %x:%x\n",
593 destid, hopcount);
594 return -EINVAL;
595 }
596
597 /* Delay a bit */
598 mdelay(1);
599 tcnt++;
600 /* Try to acquire device lock again */
601 rio_mport_write_config_32(port, destid,
602 hopcount,
603 RIO_HOST_DID_LOCK_CSR,
604 port->host_deviceid);
605 rio_mport_read_config_32(port, destid,
606 hopcount,
607 RIO_HOST_DID_LOCK_CSR, &result);
608 }
609
610 return 0;
611}
612
613/**
614 * rio_unlock_device - Releases host device lock for specified device
615 * @port: Master port to send transaction
616 * @destid: Destination ID for device/switch
617 * @hopcount: Hopcount to reach switch
618 *
619 * Returns 0 if device lock released or EINVAL if fails.
620 */
621static int
622rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
623{
624 u32 result;
625
626 /* Release device lock */
627 rio_mport_write_config_32(port, destid,
628 hopcount,
629 RIO_HOST_DID_LOCK_CSR,
630 port->host_deviceid);
631 rio_mport_read_config_32(port, destid, hopcount,
632 RIO_HOST_DID_LOCK_CSR, &result);
633 if ((result & 0xffff) != 0xffff) {
634 pr_debug("RIO: badness when releasing device lock %x:%x\n",
635 destid, hopcount);
636 return -EINVAL;
637 }
638
639 return 0;
640}
641
642/**
643 * rio_route_add_entry- Add a route entry to a switch routing table
644 * @rdev: RIO device
645 * @table: Routing table ID
646 * @route_destid: Destination ID to be routed
647 * @route_port: Port number to be routed
648 * @lock: lock switch device flag
649 *
650 * Calls the switch specific add_entry() method to add a route entry
651 * on a switch. The route table can be specified using the @table
652 * argument if a switch has per port routing tables or the normal
653 * use is to specific all tables (or the global table) by passing
654 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
655 * on failure.
656 */
657static int
658rio_route_add_entry(struct rio_dev *rdev,
659 u16 table, u16 route_destid, u8 route_port, int lock)
660{
661 int rc;
662
663 if (lock) {
664 rc = rio_lock_device(rdev->net->hport, rdev->destid,
665 rdev->hopcount, 1000);
666 if (rc)
667 return rc;
668 }
669
670 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
671 rdev->hopcount, table,
672 route_destid, route_port);
673 if (lock)
674 rio_unlock_device(rdev->net->hport, rdev->destid,
675 rdev->hopcount);
676
677 return rc;
678}
679
680/**
681 * rio_route_get_entry- Read a route entry in a switch routing table
682 * @rdev: RIO device
683 * @table: Routing table ID
684 * @route_destid: Destination ID to be routed
685 * @route_port: Pointer to read port number into
686 * @lock: lock switch device flag
687 *
688 * Calls the switch specific get_entry() method to read a route entry
689 * in a switch. The route table can be specified using the @table
690 * argument if a switch has per port routing tables or the normal
691 * use is to specific all tables (or the global table) by passing
692 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
693 * on failure.
694 */
695static int
696rio_route_get_entry(struct rio_dev *rdev, u16 table,
697 u16 route_destid, u8 *route_port, int lock)
698{
699 int rc;
700
701 if (lock) {
702 rc = rio_lock_device(rdev->net->hport, rdev->destid,
703 rdev->hopcount, 1000);
704 if (rc)
705 return rc;
706 }
707
708 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
709 rdev->hopcount, table,
710 route_destid, route_port);
711 if (lock)
712 rio_unlock_device(rdev->net->hport, rdev->destid,
713 rdev->hopcount);
714
715 return rc;
716}
717
718/**
719 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
720 * @port: Master port to send transaction
721 * @hopcount: Number of hops to the device
722 *
723 * Used during enumeration to read the Host Device ID Lock CSR on a
724 * RIO device. Returns the value of the lock register.
725 */
726static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
727{
728 u32 result;
729
730 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
731 RIO_HOST_DID_LOCK_CSR, &result);
732
733 return (u16) (result & 0xffff);
734}
735
736/**
737 * rio_enum_peer- Recursively enumerate a RIO network through a master port
738 * @net: RIO network being enumerated
739 * @port: Master port to send transactions
740 * @hopcount: Number of hops into the network
741 * @prev: Previous RIO device connected to the enumerated one
742 * @prev_port: Port on previous RIO device
743 *
744 * Recursively enumerates a RIO network. Transactions are sent via the
745 * master port passed in @port.
746 */
747static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
748 u8 hopcount, struct rio_dev *prev, int prev_port)
749{
750 int port_num;
751 int cur_destid;
752 int sw_destid;
753 int sw_inport;
754 struct rio_dev *rdev;
755 u16 destid;
756 u32 regval;
757 int tmp;
758
759 if (rio_mport_chk_dev_access(port,
760 RIO_ANY_DESTID(port->sys_size), hopcount)) {
761 pr_debug("RIO: device access check failed\n");
762 return -1;
763 }
764
765 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
766 pr_debug("RIO: PE already discovered by this host\n");
767 /*
768 * Already discovered by this host. Add it as another
769 * link to the existing device.
770 */
771 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
772 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
773
774 if (regval) {
775 rdev = rio_get_comptag((regval & 0xffff), NULL);
776
777 if (rdev && prev && rio_is_switch(prev)) {
778 pr_debug("RIO: redundant path to %s\n",
779 rio_name(rdev));
780 prev->rswitch->nextdev[prev_port] = rdev;
781 }
782 }
783
784 return 0;
785 }
786
787 /* Attempt to acquire device lock */
788 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
789 hopcount,
790 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
791 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
792 < port->host_deviceid) {
793 /* Delay a bit */
794 mdelay(1);
795 /* Attempt to acquire device lock again */
796 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
797 hopcount,
798 RIO_HOST_DID_LOCK_CSR,
799 port->host_deviceid);
800 }
801
802 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
803 pr_debug(
804 "RIO: PE locked by a higher priority host...retreating\n");
805 return -1;
806 }
807
808 /* Setup new RIO device */
809 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
810 hopcount, 1);
811 if (rdev) {
812 /* Add device to the global and bus/net specific list. */
813 list_add_tail(&rdev->net_list, &net->devices);
814 rdev->prev = prev;
815 if (prev && rio_is_switch(prev))
816 prev->rswitch->nextdev[prev_port] = rdev;
817 } else
818 return -1;
819
820 if (rio_is_switch(rdev)) {
821 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
822 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
823 port->host_deviceid, sw_inport, 0);
824 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
825
826 for (destid = 0; destid < next_destid; destid++) {
827 if (destid == port->host_deviceid)
828 continue;
829 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
830 destid, sw_inport, 0);
831 rdev->rswitch->route_table[destid] = sw_inport;
832 }
833
834 pr_debug(
835 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
836 rio_name(rdev), rdev->vid, rdev->did,
837 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
838 sw_destid = next_destid;
839 for (port_num = 0;
840 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
841 port_num++) {
842 /*Enable Input Output Port (transmitter reviever)*/
843 rio_enable_rx_tx_port(port, 0,
844 RIO_ANY_DESTID(port->sys_size),
845 hopcount, port_num);
846
847 if (sw_inport == port_num) {
848 rdev->rswitch->port_ok |= (1 << port_num);
849 continue;
850 }
851
852 cur_destid = next_destid;
853
854 if (rio_sport_is_active
855 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
856 port_num)) {
857 pr_debug(
858 "RIO: scanning device on port %d\n",
859 port_num);
860 rdev->rswitch->port_ok |= (1 << port_num);
861 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
862 RIO_ANY_DESTID(port->sys_size),
863 port_num, 0);
864
865 if (rio_enum_peer(net, port, hopcount + 1,
866 rdev, port_num) < 0)
867 return -1;
868
869 /* Update routing tables */
870 if (next_destid > cur_destid) {
871 for (destid = cur_destid;
872 destid < next_destid; destid++) {
873 if (destid == port->host_deviceid)
874 continue;
875 rio_route_add_entry(rdev,
876 RIO_GLOBAL_TABLE,
877 destid,
878 port_num,
879 0);
880 rdev->rswitch->
881 route_table[destid] =
882 port_num;
883 }
884 }
885 } else {
886 /* If switch supports Error Management,
887 * set PORT_LOCKOUT bit for unused port
888 */
889 if (rdev->em_efptr)
890 rio_set_port_lockout(rdev, port_num, 1);
891
892 rdev->rswitch->port_ok &= ~(1 << port_num);
893 }
894 }
895
896 /* Direct Port-write messages to the enumeratiing host */
897 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
898 (rdev->em_efptr)) {
899 rio_write_config_32(rdev,
900 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
901 (port->host_deviceid << 16) |
902 (port->sys_size << 15));
903 }
904
905 rio_init_em(rdev);
906
907 /* Check for empty switch */
908 if (next_destid == sw_destid) {
909 next_destid++;
910 if (next_destid == port->host_deviceid)
911 next_destid++;
912 }
913
914 rdev->destid = sw_destid;
915 } else
916 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
917 rio_name(rdev), rdev->vid, rdev->did);
918
919 return 0;
920}
921
922/**
923 * rio_enum_complete- Tests if enumeration of a network is complete
924 * @port: Master port to send transaction
925 *
926 * Tests the PGCCSR discovered bit for non-zero value (enumeration
927 * complete flag). Return %1 if enumeration is complete or %0 if
928 * enumeration is incomplete.
929 */
930static int rio_enum_complete(struct rio_mport *port)
931{
932 u32 regval;
933
934 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
935 ®val);
936 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
937}
938
939/**
940 * rio_disc_peer- Recursively discovers a RIO network through a master port
941 * @net: RIO network being discovered
942 * @port: Master port to send transactions
943 * @destid: Current destination ID in network
944 * @hopcount: Number of hops into the network
945 * @prev: previous rio_dev
946 * @prev_port: previous port number
947 *
948 * Recursively discovers a RIO network. Transactions are sent via the
949 * master port passed in @port.
950 */
951static int __devinit
952rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
953 u8 hopcount, struct rio_dev *prev, int prev_port)
954{
955 u8 port_num, route_port;
956 struct rio_dev *rdev;
957 u16 ndestid;
958
959 /* Setup new RIO device */
960 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
961 /* Add device to the global and bus/net specific list. */
962 list_add_tail(&rdev->net_list, &net->devices);
963 rdev->prev = prev;
964 if (prev && rio_is_switch(prev))
965 prev->rswitch->nextdev[prev_port] = rdev;
966 } else
967 return -1;
968
969 if (rio_is_switch(rdev)) {
970 /* Associated destid is how we accessed this switch */
971 rdev->destid = destid;
972
973 pr_debug(
974 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
975 rio_name(rdev), rdev->vid, rdev->did,
976 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
977 for (port_num = 0;
978 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
979 port_num++) {
980 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
981 continue;
982
983 if (rio_sport_is_active
984 (port, destid, hopcount, port_num)) {
985 pr_debug(
986 "RIO: scanning device on port %d\n",
987 port_num);
988
989 rio_lock_device(port, destid, hopcount, 1000);
990
991 for (ndestid = 0;
992 ndestid < RIO_ANY_DESTID(port->sys_size);
993 ndestid++) {
994 rio_route_get_entry(rdev,
995 RIO_GLOBAL_TABLE,
996 ndestid,
997 &route_port, 0);
998 if (route_port == port_num)
999 break;
1000 }
1001
1002 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1003 continue;
1004 rio_unlock_device(port, destid, hopcount);
1005 if (rio_disc_peer(net, port, ndestid,
1006 hopcount + 1, rdev, port_num) < 0)
1007 return -1;
1008 }
1009 }
1010 } else
1011 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1012 rio_name(rdev), rdev->vid, rdev->did);
1013
1014 return 0;
1015}
1016
1017/**
1018 * rio_mport_is_active- Tests if master port link is active
1019 * @port: Master port to test
1020 *
1021 * Reads the port error status CSR for the master port to
1022 * determine if the port has an active link. Returns
1023 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1024 * or %0 if it is inactive.
1025 */
1026static int rio_mport_is_active(struct rio_mport *port)
1027{
1028 u32 result = 0;
1029 u32 ext_ftr_ptr;
1030 int *entry = rio_mport_phys_table;
1031
1032 do {
1033 if ((ext_ftr_ptr =
1034 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1035 break;
1036 } while (*++entry >= 0);
1037
1038 if (ext_ftr_ptr)
1039 rio_local_read_config_32(port,
1040 ext_ftr_ptr +
1041 RIO_PORT_N_ERR_STS_CSR(port->index),
1042 &result);
1043
1044 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1045}
1046
1047/**
1048 * rio_alloc_net- Allocate and configure a new RIO network
1049 * @port: Master port associated with the RIO network
1050 *
1051 * Allocates a RIO network structure, initializes per-network
1052 * list heads, and adds the associated master port to the
1053 * network list of associated master ports. Returns a
1054 * RIO network pointer on success or %NULL on failure.
1055 */
1056static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1057{
1058 struct rio_net *net;
1059
1060 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1061 if (net) {
1062 INIT_LIST_HEAD(&net->node);
1063 INIT_LIST_HEAD(&net->devices);
1064 INIT_LIST_HEAD(&net->mports);
1065 list_add_tail(&port->nnode, &net->mports);
1066 net->hport = port;
1067 net->id = next_net++;
1068 }
1069 return net;
1070}
1071
1072/**
1073 * rio_update_route_tables- Updates route tables in switches
1074 * @port: Master port associated with the RIO network
1075 *
1076 * For each enumerated device, ensure that each switch in a system
1077 * has correct routing entries. Add routes for devices that where
1078 * unknown dirung the first enumeration pass through the switch.
1079 */
1080static void rio_update_route_tables(struct rio_mport *port)
1081{
1082 struct rio_dev *rdev, *swrdev;
1083 struct rio_switch *rswitch;
1084 u8 sport;
1085 u16 destid;
1086
1087 list_for_each_entry(rdev, &rio_devices, global_list) {
1088
1089 destid = rdev->destid;
1090
1091 list_for_each_entry(rswitch, &rio_switches, node) {
1092
1093 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1094 continue;
1095
1096 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1097 swrdev = sw_to_rio_dev(rswitch);
1098
1099 /* Skip if destid ends in empty switch*/
1100 if (swrdev->destid == destid)
1101 continue;
1102
1103 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1104
1105 if (rswitch->add_entry) {
1106 rio_route_add_entry(swrdev,
1107 RIO_GLOBAL_TABLE, destid,
1108 sport, 0);
1109 rswitch->route_table[destid] = sport;
1110 }
1111 }
1112 }
1113 }
1114}
1115
1116/**
1117 * rio_init_em - Initializes RIO Error Management (for switches)
1118 * @rdev: RIO device
1119 *
1120 * For each enumerated switch, call device-specific error management
1121 * initialization routine (if supplied by the switch driver).
1122 */
1123static void rio_init_em(struct rio_dev *rdev)
1124{
1125 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1126 (rdev->rswitch->em_init)) {
1127 rdev->rswitch->em_init(rdev);
1128 }
1129}
1130
1131/**
1132 * rio_pw_enable - Enables/disables port-write handling by a master port
1133 * @port: Master port associated with port-write handling
1134 * @enable: 1=enable, 0=disable
1135 */
1136static void rio_pw_enable(struct rio_mport *port, int enable)
1137{
1138 if (port->ops->pwenable)
1139 port->ops->pwenable(port, enable);
1140}
1141
1142/**
1143 * rio_enum_mport- Start enumeration through a master port
1144 * @mport: Master port to send transactions
1145 *
1146 * Starts the enumeration process. If somebody has enumerated our
1147 * master port device, then give up. If not and we have an active
1148 * link, then start recursive peer enumeration. Returns %0 if
1149 * enumeration succeeds or %-EBUSY if enumeration fails.
1150 */
1151int __devinit rio_enum_mport(struct rio_mport *mport)
1152{
1153 struct rio_net *net = NULL;
1154 int rc = 0;
1155
1156 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1157 mport->name);
1158 /* If somebody else enumerated our master port device, bail. */
1159 if (rio_enum_host(mport) < 0) {
1160 printk(KERN_INFO
1161 "RIO: master port %d device has been enumerated by a remote host\n",
1162 mport->id);
1163 rc = -EBUSY;
1164 goto out;
1165 }
1166
1167 /* If master port has an active link, allocate net and enum peers */
1168 if (rio_mport_is_active(mport)) {
1169 if (!(net = rio_alloc_net(mport))) {
1170 printk(KERN_ERR "RIO: failed to allocate new net\n");
1171 rc = -ENOMEM;
1172 goto out;
1173 }
1174
1175 /* Enable Input Output Port (transmitter reviever) */
1176 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1177
1178 /* Set component tag for host */
1179 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1180 next_comptag++);
1181
1182 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1183 /* A higher priority host won enumeration, bail. */
1184 printk(KERN_INFO
1185 "RIO: master port %d device has lost enumeration to a remote host\n",
1186 mport->id);
1187 rio_clear_locks(mport);
1188 rc = -EBUSY;
1189 goto out;
1190 }
1191 rio_update_route_tables(mport);
1192 rio_clear_locks(mport);
1193 rio_pw_enable(mport, 1);
1194 } else {
1195 printk(KERN_INFO "RIO: master port %d link inactive\n",
1196 mport->id);
1197 rc = -EINVAL;
1198 }
1199
1200 out:
1201 return rc;
1202}
1203
1204/**
1205 * rio_build_route_tables- Generate route tables from switch route entries
1206 *
1207 * For each switch device, generate a route table by copying existing
1208 * route entries from the switch.
1209 */
1210static void rio_build_route_tables(void)
1211{
1212 struct rio_dev *rdev;
1213 int i;
1214 u8 sport;
1215
1216 list_for_each_entry(rdev, &rio_devices, global_list)
1217 if (rio_is_switch(rdev)) {
1218 rio_lock_device(rdev->net->hport, rdev->destid,
1219 rdev->hopcount, 1000);
1220 for (i = 0;
1221 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1222 i++) {
1223 if (rio_route_get_entry(rdev,
1224 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1225 continue;
1226 rdev->rswitch->route_table[i] = sport;
1227 }
1228
1229 rio_unlock_device(rdev->net->hport,
1230 rdev->destid,
1231 rdev->hopcount);
1232 }
1233}
1234
1235/**
1236 * rio_enum_timeout- Signal that enumeration timed out
1237 * @data: Address of timeout flag.
1238 *
1239 * When the enumeration complete timer expires, set a flag that
1240 * signals to the discovery process that enumeration did not
1241 * complete in a sane amount of time.
1242 */
1243static void rio_enum_timeout(unsigned long data)
1244{
1245 /* Enumeration timed out, set flag */
1246 *(int *)data = 1;
1247}
1248
1249/**
1250 * rio_disc_mport- Start discovery through a master port
1251 * @mport: Master port to send transactions
1252 *
1253 * Starts the discovery process. If we have an active link,
1254 * then wait for the signal that enumeration is complete.
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1257 * on failure.
1258 */
1259int __devinit rio_disc_mport(struct rio_mport *mport)
1260{
1261 struct rio_net *net = NULL;
1262 int enum_timeout_flag = 0;
1263
1264 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1265 mport->name);
1266
1267 /* If master port has an active link, allocate net and discover peers */
1268 if (rio_mport_is_active(mport)) {
1269 if (!(net = rio_alloc_net(mport))) {
1270 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1271 goto bail;
1272 }
1273
1274 pr_debug("RIO: wait for enumeration complete...");
1275
1276 rio_enum_timer.expires =
1277 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1278 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1279 add_timer(&rio_enum_timer);
1280 while (!rio_enum_complete(mport)) {
1281 mdelay(1);
1282 if (enum_timeout_flag) {
1283 del_timer_sync(&rio_enum_timer);
1284 goto timeout;
1285 }
1286 }
1287 del_timer_sync(&rio_enum_timer);
1288
1289 pr_debug("done\n");
1290
1291 /* Read DestID assigned by enumerator */
1292 rio_local_read_config_32(mport, RIO_DID_CSR,
1293 &mport->host_deviceid);
1294 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1295 mport->host_deviceid);
1296
1297 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1298 0, NULL, 0) < 0) {
1299 printk(KERN_INFO
1300 "RIO: master port %d device has failed discovery\n",
1301 mport->id);
1302 goto bail;
1303 }
1304
1305 rio_build_route_tables();
1306 }
1307
1308 return 0;
1309
1310 timeout:
1311 pr_debug("timeout\n");
1312 bail:
1313 return -EBUSY;
1314}