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