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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/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
42static int next_destid = 0;
43static int next_comptag = 1;
44
45static int rio_mport_phys_table[] = {
46 RIO_EFB_PAR_EP_ID,
47 RIO_EFB_PAR_EP_REC_ID,
48 RIO_EFB_SER_EP_ID,
49 RIO_EFB_SER_EP_REC_ID,
50 -1,
51};
52
53
54/**
55 * rio_destid_alloc - Allocate next available destID for given network
56 * @net: RIO network
57 *
58 * Returns next available device destination ID for the specified RIO network.
59 * Marks allocated ID as one in use.
60 * Returns RIO_INVALID_DESTID if new destID is not available.
61 */
62static u16 rio_destid_alloc(struct rio_net *net)
63{
64 int destid;
65 struct rio_id_table *idtab = &net->destid_table;
66
67 spin_lock(&idtab->lock);
68 destid = find_first_zero_bit(idtab->table, idtab->max);
69
70 if (destid < idtab->max) {
71 set_bit(destid, idtab->table);
72 destid += idtab->start;
73 } else
74 destid = RIO_INVALID_DESTID;
75
76 spin_unlock(&idtab->lock);
77 return (u16)destid;
78}
79
80/**
81 * rio_destid_reserve - Reserve the specivied destID
82 * @net: RIO network
83 * @destid: destID to reserve
84 *
85 * Tries to reserve the specified destID.
86 * Returns 0 if successfull.
87 */
88static int rio_destid_reserve(struct rio_net *net, u16 destid)
89{
90 int oldbit;
91 struct rio_id_table *idtab = &net->destid_table;
92
93 destid -= idtab->start;
94 spin_lock(&idtab->lock);
95 oldbit = test_and_set_bit(destid, idtab->table);
96 spin_unlock(&idtab->lock);
97 return oldbit;
98}
99
100/**
101 * rio_destid_free - free a previously allocated destID
102 * @net: RIO network
103 * @destid: destID to free
104 *
105 * Makes the specified destID available for use.
106 */
107static void rio_destid_free(struct rio_net *net, u16 destid)
108{
109 struct rio_id_table *idtab = &net->destid_table;
110
111 destid -= idtab->start;
112 spin_lock(&idtab->lock);
113 clear_bit(destid, idtab->table);
114 spin_unlock(&idtab->lock);
115}
116
117/**
118 * rio_destid_first - return first destID in use
119 * @net: RIO network
120 */
121static u16 rio_destid_first(struct rio_net *net)
122{
123 int destid;
124 struct rio_id_table *idtab = &net->destid_table;
125
126 spin_lock(&idtab->lock);
127 destid = find_first_bit(idtab->table, idtab->max);
128 if (destid >= idtab->max)
129 destid = RIO_INVALID_DESTID;
130 else
131 destid += idtab->start;
132 spin_unlock(&idtab->lock);
133 return (u16)destid;
134}
135
136/**
137 * rio_destid_next - return next destID in use
138 * @net: RIO network
139 * @from: destination ID from which search shall continue
140 */
141static u16 rio_destid_next(struct rio_net *net, u16 from)
142{
143 int destid;
144 struct rio_id_table *idtab = &net->destid_table;
145
146 spin_lock(&idtab->lock);
147 destid = find_next_bit(idtab->table, idtab->max, from);
148 if (destid >= idtab->max)
149 destid = RIO_INVALID_DESTID;
150 else
151 destid += idtab->start;
152 spin_unlock(&idtab->lock);
153 return (u16)destid;
154}
155
156/**
157 * rio_get_device_id - Get the base/extended device id for a device
158 * @port: RIO master port
159 * @destid: Destination ID of device
160 * @hopcount: Hopcount to device
161 *
162 * Reads the base/extended device id from a device. Returns the
163 * 8/16-bit device ID.
164 */
165static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
166{
167 u32 result;
168
169 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
170
171 return RIO_GET_DID(port->sys_size, result);
172}
173
174/**
175 * rio_set_device_id - Set the base/extended device id for a device
176 * @port: RIO master port
177 * @destid: Destination ID of device
178 * @hopcount: Hopcount to device
179 * @did: Device ID value to be written
180 *
181 * Writes the base/extended device id from a device.
182 */
183static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
184{
185 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
186 RIO_SET_DID(port->sys_size, did));
187}
188
189/**
190 * rio_local_set_device_id - Set the base/extended device id for a port
191 * @port: RIO master port
192 * @did: Device ID value to be written
193 *
194 * Writes the base/extended device id from a device.
195 */
196static void rio_local_set_device_id(struct rio_mport *port, u16 did)
197{
198 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
199 did));
200}
201
202/**
203 * rio_clear_locks- Release all host locks and signal enumeration complete
204 * @net: RIO network to run on
205 *
206 * Marks the component tag CSR on each device with the enumeration
207 * complete flag. When complete, it then release the host locks on
208 * each device. Returns 0 on success or %-EINVAL on failure.
209 */
210static int rio_clear_locks(struct rio_net *net)
211{
212 struct rio_mport *port = net->hport;
213 struct rio_dev *rdev;
214 u32 result;
215 int ret = 0;
216
217 /* Release host device id locks */
218 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
219 port->host_deviceid);
220 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
221 if ((result & 0xffff) != 0xffff) {
222 printk(KERN_INFO
223 "RIO: badness when releasing host lock on master port, result %8.8x\n",
224 result);
225 ret = -EINVAL;
226 }
227 list_for_each_entry(rdev, &net->devices, net_list) {
228 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
229 port->host_deviceid);
230 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
231 if ((result & 0xffff) != 0xffff) {
232 printk(KERN_INFO
233 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
234 rdev->vid, rdev->did);
235 ret = -EINVAL;
236 }
237
238 /* Mark device as discovered and enable master */
239 rio_read_config_32(rdev,
240 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
241 &result);
242 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
243 rio_write_config_32(rdev,
244 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
245 result);
246 }
247
248 return ret;
249}
250
251/**
252 * rio_enum_host- Set host lock and initialize host destination ID
253 * @port: Master port to issue transaction
254 *
255 * Sets the local host master port lock and destination ID register
256 * with the host device ID value. The host device ID value is provided
257 * by the platform. Returns %0 on success or %-1 on failure.
258 */
259static int rio_enum_host(struct rio_mport *port)
260{
261 u32 result;
262
263 /* Set master port host device id lock */
264 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
265 port->host_deviceid);
266
267 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
268 if ((result & 0xffff) != port->host_deviceid)
269 return -1;
270
271 /* Set master port destid and init destid ctr */
272 rio_local_set_device_id(port, port->host_deviceid);
273 return 0;
274}
275
276/**
277 * rio_device_has_destid- Test if a device contains a destination ID register
278 * @port: Master port to issue transaction
279 * @src_ops: RIO device source operations
280 * @dst_ops: RIO device destination operations
281 *
282 * Checks the provided @src_ops and @dst_ops for the necessary transaction
283 * capabilities that indicate whether or not a device will implement a
284 * destination ID register. Returns 1 if true or 0 if false.
285 */
286static int rio_device_has_destid(struct rio_mport *port, int src_ops,
287 int dst_ops)
288{
289 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
290
291 return !!((src_ops | dst_ops) & mask);
292}
293
294/**
295 * rio_release_dev- Frees a RIO device struct
296 * @dev: LDM device associated with a RIO device struct
297 *
298 * Gets the RIO device struct associated a RIO device struct.
299 * The RIO device struct is freed.
300 */
301static void rio_release_dev(struct device *dev)
302{
303 struct rio_dev *rdev;
304
305 rdev = to_rio_dev(dev);
306 kfree(rdev);
307}
308
309/**
310 * rio_is_switch- Tests if a RIO device has switch capabilities
311 * @rdev: RIO device
312 *
313 * Gets the RIO device Processing Element Features register
314 * contents and tests for switch capabilities. Returns 1 if
315 * the device is a switch or 0 if it is not a switch.
316 * The RIO device struct is freed.
317 */
318static int rio_is_switch(struct rio_dev *rdev)
319{
320 if (rdev->pef & RIO_PEF_SWITCH)
321 return 1;
322 return 0;
323}
324
325/**
326 * rio_setup_device- Allocates and sets up a RIO device
327 * @net: RIO network
328 * @port: Master port to send transactions
329 * @destid: Current destination ID
330 * @hopcount: Current hopcount
331 * @do_enum: Enumeration/Discovery mode flag
332 *
333 * Allocates a RIO device and configures fields based on configuration
334 * space contents. If device has a destination ID register, a destination
335 * ID is either assigned in enumeration mode or read from configuration
336 * space in discovery mode. If the device has switch capabilities, then
337 * a switch is allocated and configured appropriately. Returns a pointer
338 * to a RIO device on success or NULL on failure.
339 *
340 */
341static struct rio_dev *rio_setup_device(struct rio_net *net,
342 struct rio_mport *port, u16 destid,
343 u8 hopcount, int do_enum)
344{
345 int ret = 0;
346 struct rio_dev *rdev;
347 struct rio_switch *rswitch = NULL;
348 int result, rdid;
349 size_t size;
350 u32 swpinfo = 0;
351
352 size = sizeof(struct rio_dev);
353 if (rio_mport_read_config_32(port, destid, hopcount,
354 RIO_PEF_CAR, &result))
355 return NULL;
356
357 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
358 rio_mport_read_config_32(port, destid, hopcount,
359 RIO_SWP_INFO_CAR, &swpinfo);
360 if (result & RIO_PEF_SWITCH) {
361 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
362 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
363 }
364 }
365
366 rdev = kzalloc(size, GFP_KERNEL);
367 if (!rdev)
368 return NULL;
369
370 rdev->net = net;
371 rdev->pef = result;
372 rdev->swpinfo = swpinfo;
373 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
374 &result);
375 rdev->did = result >> 16;
376 rdev->vid = result & 0xffff;
377 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
378 &rdev->device_rev);
379 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
380 &result);
381 rdev->asm_did = result >> 16;
382 rdev->asm_vid = result & 0xffff;
383 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
384 &result);
385 rdev->asm_rev = result >> 16;
386 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
387 rdev->efptr = result & 0xffff;
388 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
389 hopcount);
390
391 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
392 hopcount, RIO_EFB_ERR_MGMNT);
393 }
394
395 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
396 &rdev->src_ops);
397 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
398 &rdev->dst_ops);
399
400 if (do_enum) {
401 /* Assign component tag to device */
402 if (next_comptag >= 0x10000) {
403 pr_err("RIO: Component Tag Counter Overflow\n");
404 goto cleanup;
405 }
406 rio_mport_write_config_32(port, destid, hopcount,
407 RIO_COMPONENT_TAG_CSR, next_comptag);
408 rdev->comp_tag = next_comptag++;
409 rdev->do_enum = true;
410 } else {
411 rio_mport_read_config_32(port, destid, hopcount,
412 RIO_COMPONENT_TAG_CSR,
413 &rdev->comp_tag);
414 }
415
416 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
417 if (do_enum) {
418 rio_set_device_id(port, destid, hopcount, next_destid);
419 rdev->destid = next_destid;
420 next_destid = rio_destid_alloc(net);
421 } else
422 rdev->destid = rio_get_device_id(port, destid, hopcount);
423
424 rdev->hopcount = 0xff;
425 } else {
426 /* Switch device has an associated destID which
427 * will be adjusted later
428 */
429 rdev->destid = destid;
430 rdev->hopcount = hopcount;
431 }
432
433 /* If a PE has both switch and other functions, show it as a switch */
434 if (rio_is_switch(rdev)) {
435 rswitch = rdev->rswitch;
436 rswitch->port_ok = 0;
437 spin_lock_init(&rswitch->lock);
438 rswitch->route_table = kzalloc(sizeof(u8)*
439 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
440 GFP_KERNEL);
441 if (!rswitch->route_table)
442 goto cleanup;
443 /* Initialize switch route table */
444 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
445 rdid++)
446 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
447 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
448 rdev->comp_tag & RIO_CTAG_UDEVID);
449
450 if (do_enum)
451 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
452
453 list_add_tail(&rswitch->node, &net->switches);
454
455 } else {
456 if (do_enum)
457 /*Enable Input Output Port (transmitter reviever)*/
458 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
459
460 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
461 rdev->comp_tag & RIO_CTAG_UDEVID);
462 }
463
464 rdev->dev.parent = &port->dev;
465 rio_attach_device(rdev);
466
467 device_initialize(&rdev->dev);
468 rdev->dev.release = rio_release_dev;
469 rio_dev_get(rdev);
470
471 rdev->dma_mask = DMA_BIT_MASK(32);
472 rdev->dev.dma_mask = &rdev->dma_mask;
473 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
474
475 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
476 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
477 0, 0xffff);
478
479 ret = rio_add_device(rdev);
480 if (ret)
481 goto cleanup;
482
483 return rdev;
484
485cleanup:
486 if (rswitch)
487 kfree(rswitch->route_table);
488
489 kfree(rdev);
490 return NULL;
491}
492
493/**
494 * rio_sport_is_active- Tests if a switch port has an active connection.
495 * @port: Master port to send transaction
496 * @destid: Associated destination ID for switch
497 * @hopcount: Hopcount to reach switch
498 * @sport: Switch port number
499 *
500 * Reads the port error status CSR for a particular switch port to
501 * determine if the port has an active link. Returns
502 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
503 * inactive.
504 */
505static int
506rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
507{
508 u32 result = 0;
509 u32 ext_ftr_ptr;
510
511 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
512
513 while (ext_ftr_ptr) {
514 rio_mport_read_config_32(port, destid, hopcount,
515 ext_ftr_ptr, &result);
516 result = RIO_GET_BLOCK_ID(result);
517 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
518 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
519 (result == RIO_EFB_SER_EP_FREC_ID))
520 break;
521
522 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
523 ext_ftr_ptr);
524 }
525
526 if (ext_ftr_ptr)
527 rio_mport_read_config_32(port, destid, hopcount,
528 ext_ftr_ptr +
529 RIO_PORT_N_ERR_STS_CSR(sport),
530 &result);
531
532 return result & RIO_PORT_N_ERR_STS_PORT_OK;
533}
534
535/**
536 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
537 * @port: Master port to send transaction
538 * @hopcount: Number of hops to the device
539 *
540 * Used during enumeration to read the Host Device ID Lock CSR on a
541 * RIO device. Returns the value of the lock register.
542 */
543static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
544{
545 u32 result;
546
547 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
548 RIO_HOST_DID_LOCK_CSR, &result);
549
550 return (u16) (result & 0xffff);
551}
552
553/**
554 * rio_enum_peer- Recursively enumerate a RIO network through a master port
555 * @net: RIO network being enumerated
556 * @port: Master port to send transactions
557 * @hopcount: Number of hops into the network
558 * @prev: Previous RIO device connected to the enumerated one
559 * @prev_port: Port on previous RIO device
560 *
561 * Recursively enumerates a RIO network. Transactions are sent via the
562 * master port passed in @port.
563 */
564static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
565 u8 hopcount, struct rio_dev *prev, int prev_port)
566{
567 struct rio_dev *rdev;
568 u32 regval;
569 int tmp;
570
571 if (rio_mport_chk_dev_access(port,
572 RIO_ANY_DESTID(port->sys_size), hopcount)) {
573 pr_debug("RIO: device access check failed\n");
574 return -1;
575 }
576
577 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
578 pr_debug("RIO: PE already discovered by this host\n");
579 /*
580 * Already discovered by this host. Add it as another
581 * link to the existing device.
582 */
583 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
584 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
585
586 if (regval) {
587 rdev = rio_get_comptag((regval & 0xffff), NULL);
588
589 if (rdev && prev && rio_is_switch(prev)) {
590 pr_debug("RIO: redundant path to %s\n",
591 rio_name(rdev));
592 prev->rswitch->nextdev[prev_port] = rdev;
593 }
594 }
595
596 return 0;
597 }
598
599 /* Attempt to acquire device lock */
600 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
601 hopcount,
602 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
603 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
604 < port->host_deviceid) {
605 /* Delay a bit */
606 mdelay(1);
607 /* Attempt to acquire device lock again */
608 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
609 hopcount,
610 RIO_HOST_DID_LOCK_CSR,
611 port->host_deviceid);
612 }
613
614 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
615 pr_debug(
616 "RIO: PE locked by a higher priority host...retreating\n");
617 return -1;
618 }
619
620 /* Setup new RIO device */
621 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
622 hopcount, 1);
623 if (rdev) {
624 /* Add device to the global and bus/net specific list. */
625 list_add_tail(&rdev->net_list, &net->devices);
626 rdev->prev = prev;
627 if (prev && rio_is_switch(prev))
628 prev->rswitch->nextdev[prev_port] = rdev;
629 } else
630 return -1;
631
632 if (rio_is_switch(rdev)) {
633 int sw_destid;
634 int cur_destid;
635 int sw_inport;
636 u16 destid;
637 int port_num;
638
639 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
640 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
641 port->host_deviceid, sw_inport, 0);
642 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
643
644 destid = rio_destid_first(net);
645 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
646 if (destid != port->host_deviceid) {
647 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
648 destid, sw_inport, 0);
649 rdev->rswitch->route_table[destid] = sw_inport;
650 }
651 destid = rio_destid_next(net, destid + 1);
652 }
653 pr_debug(
654 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
655 rio_name(rdev), rdev->vid, rdev->did,
656 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
657 sw_destid = next_destid;
658 for (port_num = 0;
659 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
660 port_num++) {
661 if (sw_inport == port_num) {
662 rio_enable_rx_tx_port(port, 0,
663 RIO_ANY_DESTID(port->sys_size),
664 hopcount, port_num);
665 rdev->rswitch->port_ok |= (1 << port_num);
666 continue;
667 }
668
669 cur_destid = next_destid;
670
671 if (rio_sport_is_active
672 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
673 port_num)) {
674 pr_debug(
675 "RIO: scanning device on port %d\n",
676 port_num);
677 rio_enable_rx_tx_port(port, 0,
678 RIO_ANY_DESTID(port->sys_size),
679 hopcount, port_num);
680 rdev->rswitch->port_ok |= (1 << port_num);
681 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
682 RIO_ANY_DESTID(port->sys_size),
683 port_num, 0);
684
685 if (rio_enum_peer(net, port, hopcount + 1,
686 rdev, port_num) < 0)
687 return -1;
688
689 /* Update routing tables */
690 destid = rio_destid_next(net, cur_destid + 1);
691 if (destid != RIO_INVALID_DESTID) {
692 for (destid = cur_destid;
693 destid < next_destid;) {
694 if (destid != port->host_deviceid) {
695 rio_route_add_entry(rdev,
696 RIO_GLOBAL_TABLE,
697 destid,
698 port_num,
699 0);
700 rdev->rswitch->
701 route_table[destid] =
702 port_num;
703 }
704 destid = rio_destid_next(net,
705 destid + 1);
706 }
707 }
708 } else {
709 /* If switch supports Error Management,
710 * set PORT_LOCKOUT bit for unused port
711 */
712 if (rdev->em_efptr)
713 rio_set_port_lockout(rdev, port_num, 1);
714
715 rdev->rswitch->port_ok &= ~(1 << port_num);
716 }
717 }
718
719 /* Direct Port-write messages to the enumeratiing host */
720 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
721 (rdev->em_efptr)) {
722 rio_write_config_32(rdev,
723 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
724 (port->host_deviceid << 16) |
725 (port->sys_size << 15));
726 }
727
728 rio_init_em(rdev);
729
730 /* Check for empty switch */
731 if (next_destid == sw_destid)
732 next_destid = rio_destid_alloc(net);
733
734 rdev->destid = sw_destid;
735 } else
736 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
737 rio_name(rdev), rdev->vid, rdev->did);
738
739 return 0;
740}
741
742/**
743 * rio_enum_complete- Tests if enumeration of a network is complete
744 * @port: Master port to send transaction
745 *
746 * Tests the PGCCSR discovered bit for non-zero value (enumeration
747 * complete flag). Return %1 if enumeration is complete or %0 if
748 * enumeration is incomplete.
749 */
750static int rio_enum_complete(struct rio_mport *port)
751{
752 u32 regval;
753
754 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
755 ®val);
756 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
757}
758
759/**
760 * rio_disc_peer- Recursively discovers a RIO network through a master port
761 * @net: RIO network being discovered
762 * @port: Master port to send transactions
763 * @destid: Current destination ID in network
764 * @hopcount: Number of hops into the network
765 * @prev: previous rio_dev
766 * @prev_port: previous port number
767 *
768 * Recursively discovers a RIO network. Transactions are sent via the
769 * master port passed in @port.
770 */
771static int
772rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
773 u8 hopcount, struct rio_dev *prev, int prev_port)
774{
775 u8 port_num, route_port;
776 struct rio_dev *rdev;
777 u16 ndestid;
778
779 /* Setup new RIO device */
780 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
781 /* Add device to the global and bus/net specific list. */
782 list_add_tail(&rdev->net_list, &net->devices);
783 rdev->prev = prev;
784 if (prev && rio_is_switch(prev))
785 prev->rswitch->nextdev[prev_port] = rdev;
786 } else
787 return -1;
788
789 if (rio_is_switch(rdev)) {
790 /* Associated destid is how we accessed this switch */
791 rdev->destid = destid;
792
793 pr_debug(
794 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
795 rio_name(rdev), rdev->vid, rdev->did,
796 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
797 for (port_num = 0;
798 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
799 port_num++) {
800 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
801 continue;
802
803 if (rio_sport_is_active
804 (port, destid, hopcount, port_num)) {
805 pr_debug(
806 "RIO: scanning device on port %d\n",
807 port_num);
808
809 rio_lock_device(port, destid, hopcount, 1000);
810
811 for (ndestid = 0;
812 ndestid < RIO_ANY_DESTID(port->sys_size);
813 ndestid++) {
814 rio_route_get_entry(rdev,
815 RIO_GLOBAL_TABLE,
816 ndestid,
817 &route_port, 0);
818 if (route_port == port_num)
819 break;
820 }
821
822 if (ndestid == RIO_ANY_DESTID(port->sys_size))
823 continue;
824 rio_unlock_device(port, destid, hopcount);
825 if (rio_disc_peer(net, port, ndestid,
826 hopcount + 1, rdev, port_num) < 0)
827 return -1;
828 }
829 }
830 } else
831 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
832 rio_name(rdev), rdev->vid, rdev->did);
833
834 return 0;
835}
836
837/**
838 * rio_mport_is_active- Tests if master port link is active
839 * @port: Master port to test
840 *
841 * Reads the port error status CSR for the master port to
842 * determine if the port has an active link. Returns
843 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
844 * or %0 if it is inactive.
845 */
846static int rio_mport_is_active(struct rio_mport *port)
847{
848 u32 result = 0;
849 u32 ext_ftr_ptr;
850 int *entry = rio_mport_phys_table;
851
852 do {
853 if ((ext_ftr_ptr =
854 rio_mport_get_feature(port, 1, 0, 0, *entry)))
855 break;
856 } while (*++entry >= 0);
857
858 if (ext_ftr_ptr)
859 rio_local_read_config_32(port,
860 ext_ftr_ptr +
861 RIO_PORT_N_ERR_STS_CSR(port->index),
862 &result);
863
864 return result & RIO_PORT_N_ERR_STS_PORT_OK;
865}
866
867/**
868 * rio_alloc_net- Allocate and configure a new RIO network
869 * @port: 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 RIO network structure, initializes per-network
874 * list heads, and adds the associated master port to the
875 * network list of associated master ports. Returns a
876 * RIO network pointer on success or %NULL on failure.
877 */
878static struct rio_net *rio_alloc_net(struct rio_mport *port,
879 int do_enum, u16 start)
880{
881 struct rio_net *net;
882
883 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
884 if (net && do_enum) {
885 net->destid_table.table = kcalloc(
886 BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
887 sizeof(long),
888 GFP_KERNEL);
889
890 if (net->destid_table.table == NULL) {
891 pr_err("RIO: failed to allocate destID table\n");
892 kfree(net);
893 net = NULL;
894 } else {
895 net->destid_table.start = start;
896 net->destid_table.max =
897 RIO_MAX_ROUTE_ENTRIES(port->sys_size);
898 spin_lock_init(&net->destid_table.lock);
899 }
900 }
901
902 if (net) {
903 INIT_LIST_HEAD(&net->node);
904 INIT_LIST_HEAD(&net->devices);
905 INIT_LIST_HEAD(&net->switches);
906 INIT_LIST_HEAD(&net->mports);
907 list_add_tail(&port->nnode, &net->mports);
908 net->hport = port;
909 net->id = port->id;
910 }
911 return net;
912}
913
914/**
915 * rio_update_route_tables- Updates route tables in switches
916 * @net: RIO network to run update on
917 *
918 * For each enumerated device, ensure that each switch in a system
919 * has correct routing entries. Add routes for devices that where
920 * unknown dirung the first enumeration pass through the switch.
921 */
922static void rio_update_route_tables(struct rio_net *net)
923{
924 struct rio_dev *rdev, *swrdev;
925 struct rio_switch *rswitch;
926 u8 sport;
927 u16 destid;
928
929 list_for_each_entry(rdev, &net->devices, net_list) {
930
931 destid = rdev->destid;
932
933 list_for_each_entry(rswitch, &net->switches, node) {
934
935 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
936 continue;
937
938 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
939 swrdev = sw_to_rio_dev(rswitch);
940
941 /* Skip if destid ends in empty switch*/
942 if (swrdev->destid == destid)
943 continue;
944
945 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
946
947 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
948 destid, sport, 0);
949 rswitch->route_table[destid] = sport;
950 }
951 }
952 }
953}
954
955/**
956 * rio_init_em - Initializes RIO Error Management (for switches)
957 * @rdev: RIO device
958 *
959 * For each enumerated switch, call device-specific error management
960 * initialization routine (if supplied by the switch driver).
961 */
962static void rio_init_em(struct rio_dev *rdev)
963{
964 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
965 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
966 rdev->rswitch->ops->em_init(rdev);
967 }
968}
969
970/**
971 * rio_pw_enable - Enables/disables port-write handling by a master port
972 * @port: Master port associated with port-write handling
973 * @enable: 1=enable, 0=disable
974 */
975static void rio_pw_enable(struct rio_mport *port, int enable)
976{
977 if (port->ops->pwenable)
978 port->ops->pwenable(port, enable);
979}
980
981/**
982 * rio_enum_mport- Start enumeration through a master port
983 * @mport: Master port to send transactions
984 * @flags: Enumeration control flags
985 *
986 * Starts the enumeration process. If somebody has enumerated our
987 * master port device, then give up. If not and we have an active
988 * link, then start recursive peer enumeration. Returns %0 if
989 * enumeration succeeds or %-EBUSY if enumeration fails.
990 */
991static int rio_enum_mport(struct rio_mport *mport, u32 flags)
992{
993 struct rio_net *net = NULL;
994 int rc = 0;
995
996 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
997 mport->name);
998
999 /*
1000 * To avoid multiple start requests (repeat enumeration is not supported
1001 * by this method) check if enumeration/discovery was performed for this
1002 * mport: if mport was added into the list of mports for a net exit
1003 * with error.
1004 */
1005 if (mport->nnode.next || mport->nnode.prev)
1006 return -EBUSY;
1007
1008 /* If somebody else enumerated our master port device, bail. */
1009 if (rio_enum_host(mport) < 0) {
1010 printk(KERN_INFO
1011 "RIO: master port %d device has been enumerated by a remote host\n",
1012 mport->id);
1013 rc = -EBUSY;
1014 goto out;
1015 }
1016
1017 /* If master port has an active link, allocate net and enum peers */
1018 if (rio_mport_is_active(mport)) {
1019 net = rio_alloc_net(mport, 1, 0);
1020 if (!net) {
1021 printk(KERN_ERR "RIO: failed to allocate new net\n");
1022 rc = -ENOMEM;
1023 goto out;
1024 }
1025
1026 /* reserve mport destID in new net */
1027 rio_destid_reserve(net, mport->host_deviceid);
1028
1029 /* Enable Input Output Port (transmitter reviever) */
1030 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1031
1032 /* Set component tag for host */
1033 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1034 next_comptag++);
1035
1036 next_destid = rio_destid_alloc(net);
1037
1038 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1039 /* A higher priority host won enumeration, bail. */
1040 printk(KERN_INFO
1041 "RIO: master port %d device has lost enumeration to a remote host\n",
1042 mport->id);
1043 rio_clear_locks(net);
1044 rc = -EBUSY;
1045 goto out;
1046 }
1047 /* free the last allocated destID (unused) */
1048 rio_destid_free(net, next_destid);
1049 rio_update_route_tables(net);
1050 rio_clear_locks(net);
1051 rio_pw_enable(mport, 1);
1052 } else {
1053 printk(KERN_INFO "RIO: master port %d link inactive\n",
1054 mport->id);
1055 rc = -EINVAL;
1056 }
1057
1058 out:
1059 return rc;
1060}
1061
1062/**
1063 * rio_build_route_tables- Generate route tables from switch route entries
1064 * @net: RIO network to run route tables scan on
1065 *
1066 * For each switch device, generate a route table by copying existing
1067 * route entries from the switch.
1068 */
1069static void rio_build_route_tables(struct rio_net *net)
1070{
1071 struct rio_switch *rswitch;
1072 struct rio_dev *rdev;
1073 int i;
1074 u8 sport;
1075
1076 list_for_each_entry(rswitch, &net->switches, node) {
1077 rdev = sw_to_rio_dev(rswitch);
1078
1079 rio_lock_device(net->hport, rdev->destid,
1080 rdev->hopcount, 1000);
1081 for (i = 0;
1082 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1083 i++) {
1084 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1085 i, &sport, 0) < 0)
1086 continue;
1087 rswitch->route_table[i] = sport;
1088 }
1089
1090 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1091 }
1092}
1093
1094/**
1095 * rio_disc_mport- Start discovery through a master port
1096 * @mport: Master port to send transactions
1097 * @flags: discovery control flags
1098 *
1099 * Starts the discovery process. If we have an active link,
1100 * then wait for the signal that enumeration is complete (if wait
1101 * is allowed).
1102 * When enumeration completion is signaled, start recursive
1103 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1104 * on failure.
1105 */
1106static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1107{
1108 struct rio_net *net = NULL;
1109 unsigned long to_end;
1110
1111 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1112 mport->name);
1113
1114 /* If master port has an active link, allocate net and discover peers */
1115 if (rio_mport_is_active(mport)) {
1116 if (rio_enum_complete(mport))
1117 goto enum_done;
1118 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1119 return -EAGAIN;
1120
1121 pr_debug("RIO: wait for enumeration to complete...\n");
1122
1123 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1124 while (time_before(jiffies, to_end)) {
1125 if (rio_enum_complete(mport))
1126 goto enum_done;
1127 msleep(10);
1128 }
1129
1130 pr_debug("RIO: discovery timeout on mport %d %s\n",
1131 mport->id, mport->name);
1132 goto bail;
1133enum_done:
1134 pr_debug("RIO: ... enumeration done\n");
1135
1136 net = rio_alloc_net(mport, 0, 0);
1137 if (!net) {
1138 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1139 goto bail;
1140 }
1141
1142 /* Read DestID assigned by enumerator */
1143 rio_local_read_config_32(mport, RIO_DID_CSR,
1144 &mport->host_deviceid);
1145 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1146 mport->host_deviceid);
1147
1148 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1149 0, NULL, 0) < 0) {
1150 printk(KERN_INFO
1151 "RIO: master port %d device has failed discovery\n",
1152 mport->id);
1153 goto bail;
1154 }
1155
1156 rio_build_route_tables(net);
1157 }
1158
1159 return 0;
1160bail:
1161 return -EBUSY;
1162}
1163
1164static struct rio_scan rio_scan_ops = {
1165 .owner = THIS_MODULE,
1166 .enumerate = rio_enum_mport,
1167 .discover = rio_disc_mport,
1168};
1169
1170static bool scan;
1171module_param(scan, bool, 0);
1172MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1173 "(default = 0)");
1174
1175/**
1176 * rio_basic_attach:
1177 *
1178 * When this enumeration/discovery method is loaded as a module this function
1179 * registers its specific enumeration and discover routines for all available
1180 * RapidIO mport devices. The "scan" command line parameter controls ability of
1181 * the module to start RapidIO enumeration/discovery automatically.
1182 *
1183 * Returns 0 for success or -EIO if unable to register itself.
1184 *
1185 * This enumeration/discovery method cannot be unloaded and therefore does not
1186 * provide a matching cleanup_module routine.
1187 */
1188
1189static int __init rio_basic_attach(void)
1190{
1191 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1192 return -EIO;
1193 if (scan)
1194 rio_init_mports();
1195 return 0;
1196}
1197
1198late_initcall(rio_basic_attach);
1199
1200MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1201MODULE_LICENSE("GPL");