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