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rapidio: use Component Tag for unified switch identification
[linux-2.6.git] / drivers / rapidio / rio-scan.c
blob467e82bd0929789867031a0ae31e1114d38e8274
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
39 LIST_HEAD(rio_devices);
40 static LIST_HEAD(rio_switches);
41
42 static void rio_enum_timeout(unsigned long);
43
44 static void rio_init_em(struct rio_dev *rdev);
45
46 DEFINE_SPINLOCK(rio_global_list_lock);
47
48 static int next_destid = 0;
49 static int next_net = 0;
50 static int next_comptag = 1;
51
52 static struct timer_list rio_enum_timer =
53 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
54
55 static 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 */
72 static 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 */
90 static 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 */
103 static 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 */
117 static 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 */
165 static 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 */
196 static 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 */
211 static 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 */
228 static 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 */
244 static 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 */
280 static 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 reciever 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 */
309 inline 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 &regval);
328 } else {
329 if (rio_mport_read_config_32(port, destid, hopcount,
330 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 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 */
372 static 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->pef & RIO_PEF_INB_DOORBELL) &&
509 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
510 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
511 0, 0xffff);
512
513 ret = rio_add_device(rdev);
514 if (ret)
515 goto cleanup;
516
517 return rdev;
518
519 cleanup:
520 if (rswitch->route_table)
521 kfree(rswitch->route_table);
522
523 kfree(rdev);
524 return NULL;
525 }
526
527 /**
528 * rio_sport_is_active- Tests if a switch port has an active connection.
529 * @port: Master port to send transaction
530 * @destid: Associated destination ID for switch
531 * @hopcount: Hopcount to reach switch
532 * @sport: Switch port number
533 *
534 * Reads the port error status CSR for a particular switch port to
535 * determine if the port has an active link. Returns
536 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
537 * inactive.
538 */
539 static int
540 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
541 {
542 u32 result = 0;
543 u32 ext_ftr_ptr;
544
545 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
546
547 while (ext_ftr_ptr) {
548 rio_mport_read_config_32(port, destid, hopcount,
549 ext_ftr_ptr, &result);
550 result = RIO_GET_BLOCK_ID(result);
551 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
552 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
553 (result == RIO_EFB_SER_EP_FREC_ID))
554 break;
555
556 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
557 ext_ftr_ptr);
558 }
559
560 if (ext_ftr_ptr)
561 rio_mport_read_config_32(port, destid, hopcount,
562 ext_ftr_ptr +
563 RIO_PORT_N_ERR_STS_CSR(sport),
564 &result);
565
566 return result & RIO_PORT_N_ERR_STS_PORT_OK;
567 }
568
569 /**
570 * rio_lock_device - Acquires host device lock for specified device
571 * @port: Master port to send transaction
572 * @destid: Destination ID for device/switch
573 * @hopcount: Hopcount to reach switch
574 * @wait_ms: Max wait time in msec (0 = no timeout)
575 *
576 * Attepts to acquire host device lock for specified device
577 * Returns 0 if device lock acquired or EINVAL if timeout expires.
578 */
579 static int
580 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
581 {
582 u32 result;
583 int tcnt = 0;
584
585 /* Attempt to acquire device lock */
586 rio_mport_write_config_32(port, destid, hopcount,
587 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
588 rio_mport_read_config_32(port, destid, hopcount,
589 RIO_HOST_DID_LOCK_CSR, &result);
590
591 while (result != port->host_deviceid) {
592 if (wait_ms != 0 && tcnt == wait_ms) {
593 pr_debug("RIO: timeout when locking device %x:%x\n",
594 destid, hopcount);
595 return -EINVAL;
596 }
597
598 /* Delay a bit */
599 mdelay(1);
600 tcnt++;
601 /* Try to acquire device lock again */
602 rio_mport_write_config_32(port, destid,
603 hopcount,
604 RIO_HOST_DID_LOCK_CSR,
605 port->host_deviceid);
606 rio_mport_read_config_32(port, destid,
607 hopcount,
608 RIO_HOST_DID_LOCK_CSR, &result);
609 }
610
611 return 0;
612 }
613
614 /**
615 * rio_unlock_device - Releases host device lock for specified device
616 * @port: Master port to send transaction
617 * @destid: Destination ID for device/switch
618 * @hopcount: Hopcount to reach switch
619 *
620 * Returns 0 if device lock released or EINVAL if fails.
621 */
622 static int
623 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
624 {
625 u32 result;
626
627 /* Release device lock */
628 rio_mport_write_config_32(port, destid,
629 hopcount,
630 RIO_HOST_DID_LOCK_CSR,
631 port->host_deviceid);
632 rio_mport_read_config_32(port, destid, hopcount,
633 RIO_HOST_DID_LOCK_CSR, &result);
634 if ((result & 0xffff) != 0xffff) {
635 pr_debug("RIO: badness when releasing device lock %x:%x\n",
636 destid, hopcount);
637 return -EINVAL;
638 }
639
640 return 0;
641 }
642
643 /**
644 * rio_route_add_entry- Add a route entry to a switch routing table
645 * @rdev: RIO device
646 * @table: Routing table ID
647 * @route_destid: Destination ID to be routed
648 * @route_port: Port number to be routed
649 * @lock: lock switch device flag
650 *
651 * Calls the switch specific add_entry() method to add a route entry
652 * on a switch. The route table can be specified using the @table
653 * argument if a switch has per port routing tables or the normal
654 * use is to specific all tables (or the global table) by passing
655 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
656 * on failure.
657 */
658 static int
659 rio_route_add_entry(struct rio_dev *rdev,
660 u16 table, u16 route_destid, u8 route_port, int lock)
661 {
662 int rc;
663
664 if (lock) {
665 rc = rio_lock_device(rdev->net->hport, rdev->destid,
666 rdev->hopcount, 1000);
667 if (rc)
668 return rc;
669 }
670
671 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
672 rdev->hopcount, table,
673 route_destid, route_port);
674 if (lock)
675 rio_unlock_device(rdev->net->hport, rdev->destid,
676 rdev->hopcount);
677
678 return rc;
679 }
680
681 /**
682 * rio_route_get_entry- Read a route entry in a switch routing table
683 * @rdev: RIO device
684 * @table: Routing table ID
685 * @route_destid: Destination ID to be routed
686 * @route_port: Pointer to read port number into
687 * @lock: lock switch device flag
688 *
689 * Calls the switch specific get_entry() method to read a route entry
690 * in a switch. The route table can be specified using the @table
691 * argument if a switch has per port routing tables or the normal
692 * use is to specific all tables (or the global table) by passing
693 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
694 * on failure.
695 */
696 static int
697 rio_route_get_entry(struct rio_dev *rdev, u16 table,
698 u16 route_destid, u8 *route_port, int lock)
699 {
700 int rc;
701
702 if (lock) {
703 rc = rio_lock_device(rdev->net->hport, rdev->destid,
704 rdev->hopcount, 1000);
705 if (rc)
706 return rc;
707 }
708
709 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
710 rdev->hopcount, table,
711 route_destid, route_port);
712 if (lock)
713 rio_unlock_device(rdev->net->hport, rdev->destid,
714 rdev->hopcount);
715
716 return rc;
717 }
718
719 /**
720 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
721 * @port: Master port to send transaction
722 * @hopcount: Number of hops to the device
723 *
724 * Used during enumeration to read the Host Device ID Lock CSR on a
725 * RIO device. Returns the value of the lock register.
726 */
727 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
728 {
729 u32 result;
730
731 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
732 RIO_HOST_DID_LOCK_CSR, &result);
733
734 return (u16) (result & 0xffff);
735 }
736
737 /**
738 * rio_enum_peer- Recursively enumerate a RIO network through a master port
739 * @net: RIO network being enumerated
740 * @port: Master port to send transactions
741 * @hopcount: Number of hops into the network
742 * @prev: Previous RIO device connected to the enumerated one
743 * @prev_port: Port on previous RIO device
744 *
745 * Recursively enumerates a RIO network. Transactions are sent via the
746 * master port passed in @port.
747 */
748 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
749 u8 hopcount, struct rio_dev *prev, int prev_port)
750 {
751 int port_num;
752 int cur_destid;
753 int sw_destid;
754 int sw_inport;
755 struct rio_dev *rdev;
756 u16 destid;
757 u32 regval;
758 int tmp;
759
760 if (rio_mport_chk_dev_access(port,
761 RIO_ANY_DESTID(port->sys_size), hopcount)) {
762 pr_debug("RIO: device access check failed\n");
763 return -1;
764 }
765
766 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
767 pr_debug("RIO: PE already discovered by this host\n");
768 /*
769 * Already discovered by this host. Add it as another
770 * link to the existing device.
771 */
772 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
773 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
774
775 if (regval) {
776 rdev = rio_get_comptag((regval & 0xffff), NULL);
777
778 if (rdev && prev && rio_is_switch(prev)) {
779 pr_debug("RIO: redundant path to %s\n",
780 rio_name(rdev));
781 prev->rswitch->nextdev[prev_port] = rdev;
782 }
783 }
784
785 return 0;
786 }
787
788 /* Attempt to acquire device lock */
789 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
790 hopcount,
791 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
792 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
793 < port->host_deviceid) {
794 /* Delay a bit */
795 mdelay(1);
796 /* Attempt to acquire device lock again */
797 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
798 hopcount,
799 RIO_HOST_DID_LOCK_CSR,
800 port->host_deviceid);
801 }
802
803 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
804 pr_debug(
805 "RIO: PE locked by a higher priority host...retreating\n");
806 return -1;
807 }
808
809 /* Setup new RIO device */
810 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
811 hopcount, 1);
812 if (rdev) {
813 /* Add device to the global and bus/net specific list. */
814 list_add_tail(&rdev->net_list, &net->devices);
815 rdev->prev = prev;
816 if (prev && rio_is_switch(prev))
817 prev->rswitch->nextdev[prev_port] = rdev;
818 } else
819 return -1;
820
821 if (rio_is_switch(rdev)) {
822 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
823 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
824 port->host_deviceid, sw_inport, 0);
825 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
826
827 for (destid = 0; destid < next_destid; destid++) {
828 if (destid == port->host_deviceid)
829 continue;
830 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
831 destid, sw_inport, 0);
832 rdev->rswitch->route_table[destid] = sw_inport;
833 }
834
835 pr_debug(
836 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
837 rio_name(rdev), rdev->vid, rdev->did,
838 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
839 sw_destid = next_destid;
840 for (port_num = 0;
841 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
842 port_num++) {
843 /*Enable Input Output Port (transmitter reviever)*/
844 rio_enable_rx_tx_port(port, 0,
845 RIO_ANY_DESTID(port->sys_size),
846 hopcount, port_num);
847
848 if (sw_inport == port_num) {
849 rdev->rswitch->port_ok |= (1 << port_num);
850 continue;
851 }
852
853 cur_destid = next_destid;
854
855 if (rio_sport_is_active
856 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
857 port_num)) {
858 pr_debug(
859 "RIO: scanning device on port %d\n",
860 port_num);
861 rdev->rswitch->port_ok |= (1 << port_num);
862 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
863 RIO_ANY_DESTID(port->sys_size),
864 port_num, 0);
865
866 if (rio_enum_peer(net, port, hopcount + 1,
867 rdev, port_num) < 0)
868 return -1;
869
870 /* Update routing tables */
871 if (next_destid > cur_destid) {
872 for (destid = cur_destid;
873 destid < next_destid; destid++) {
874 if (destid == port->host_deviceid)
875 continue;
876 rio_route_add_entry(rdev,
877 RIO_GLOBAL_TABLE,
878 destid,
879 port_num,
880 0);
881 rdev->rswitch->
882 route_table[destid] =
883 port_num;
884 }
885 }
886 } else {
887 /* If switch supports Error Management,
888 * set PORT_LOCKOUT bit for unused port
889 */
890 if (rdev->em_efptr)
891 rio_set_port_lockout(rdev, port_num, 1);
892
893 rdev->rswitch->port_ok &= ~(1 << port_num);
894 }
895 }
896
897 /* Direct Port-write messages to the enumeratiing host */
898 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
899 (rdev->em_efptr)) {
900 rio_write_config_32(rdev,
901 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
902 (port->host_deviceid << 16) |
903 (port->sys_size << 15));
904 }
905
906 rio_init_em(rdev);
907
908 /* Check for empty switch */
909 if (next_destid == sw_destid) {
910 next_destid++;
911 if (next_destid == port->host_deviceid)
912 next_destid++;
913 }
914
915 rdev->destid = sw_destid;
916 } else
917 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
918 rio_name(rdev), rdev->vid, rdev->did);
919
920 return 0;
921 }
922
923 /**
924 * rio_enum_complete- Tests if enumeration of a network is complete
925 * @port: Master port to send transaction
926 *
927 * Tests the Component Tag CSR for non-zero value (enumeration
928 * complete flag). Return %1 if enumeration is complete or %0 if
929 * enumeration is incomplete.
930 */
931 static int rio_enum_complete(struct rio_mport *port)
932 {
933 u32 regval;
934
935 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
936 &regval);
937 return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
938 }
939
940 /**
941 * rio_disc_peer- Recursively discovers a RIO network through a master port
942 * @net: RIO network being discovered
943 * @port: Master port to send transactions
944 * @destid: Current destination ID in network
945 * @hopcount: Number of hops into the network
946 *
947 * Recursively discovers a RIO network. Transactions are sent via the
948 * master port passed in @port.
949 */
950 static int __devinit
951 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
952 u8 hopcount, struct rio_dev *prev, int prev_port)
953 {
954 u8 port_num, route_port;
955 struct rio_dev *rdev;
956 u16 ndestid;
957
958 /* Setup new RIO device */
959 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
960 /* Add device to the global and bus/net specific list. */
961 list_add_tail(&rdev->net_list, &net->devices);
962 rdev->prev = prev;
963 if (prev && rio_is_switch(prev))
964 prev->rswitch->nextdev[prev_port] = rdev;
965 } else
966 return -1;
967
968 if (rio_is_switch(rdev)) {
969 /* Associated destid is how we accessed this switch */
970 rdev->destid = destid;
971
972 pr_debug(
973 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
974 rio_name(rdev), rdev->vid, rdev->did,
975 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
976 for (port_num = 0;
977 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
978 port_num++) {
979 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
980 continue;
981
982 if (rio_sport_is_active
983 (port, destid, hopcount, port_num)) {
984 pr_debug(
985 "RIO: scanning device on port %d\n",
986 port_num);
987
988 rio_lock_device(port, destid, hopcount, 1000);
989
990 for (ndestid = 0;
991 ndestid < RIO_ANY_DESTID(port->sys_size);
992 ndestid++) {
993 rio_route_get_entry(rdev,
994 RIO_GLOBAL_TABLE,
995 ndestid,
996 &route_port, 0);
997 if (route_port == port_num)
998 break;
999 }
1000
1001 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1002 continue;
1003 rio_unlock_device(port, destid, hopcount);
1004 if (rio_disc_peer(net, port, ndestid,
1005 hopcount + 1, rdev, port_num) < 0)
1006 return -1;
1007 }
1008 }
1009 } else
1010 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1011 rio_name(rdev), rdev->vid, rdev->did);
1012
1013 return 0;
1014 }
1015
1016 /**
1017 * rio_mport_is_active- Tests if master port link is active
1018 * @port: Master port to test
1019 *
1020 * Reads the port error status CSR for the master port to
1021 * determine if the port has an active link. Returns
1022 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1023 * or %0 if it is inactive.
1024 */
1025 static int rio_mport_is_active(struct rio_mport *port)
1026 {
1027 u32 result = 0;
1028 u32 ext_ftr_ptr;
1029 int *entry = rio_mport_phys_table;
1030
1031 do {
1032 if ((ext_ftr_ptr =
1033 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1034 break;
1035 } while (*++entry >= 0);
1036
1037 if (ext_ftr_ptr)
1038 rio_local_read_config_32(port,
1039 ext_ftr_ptr +
1040 RIO_PORT_N_ERR_STS_CSR(port->index),
1041 &result);
1042
1043 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1044 }
1045
1046 /**
1047 * rio_alloc_net- Allocate and configure a new RIO network
1048 * @port: Master port associated with the RIO network
1049 *
1050 * Allocates a RIO network structure, initializes per-network
1051 * list heads, and adds the associated master port to the
1052 * network list of associated master ports. Returns a
1053 * RIO network pointer on success or %NULL on failure.
1054 */
1055 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1056 {
1057 struct rio_net *net;
1058
1059 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1060 if (net) {
1061 INIT_LIST_HEAD(&net->node);
1062 INIT_LIST_HEAD(&net->devices);
1063 INIT_LIST_HEAD(&net->mports);
1064 list_add_tail(&port->nnode, &net->mports);
1065 net->hport = port;
1066 net->id = next_net++;
1067 }
1068 return net;
1069 }
1070
1071 /**
1072 * rio_update_route_tables- Updates route tables in switches
1073 * @port: Master port associated with the RIO network
1074 *
1075 * For each enumerated device, ensure that each switch in a system
1076 * has correct routing entries. Add routes for devices that where
1077 * unknown dirung the first enumeration pass through the switch.
1078 */
1079 static void rio_update_route_tables(struct rio_mport *port)
1080 {
1081 struct rio_dev *rdev, *swrdev;
1082 struct rio_switch *rswitch;
1083 u8 sport;
1084 u16 destid;
1085
1086 list_for_each_entry(rdev, &rio_devices, global_list) {
1087
1088 destid = rdev->destid;
1089
1090 list_for_each_entry(rswitch, &rio_switches, node) {
1091
1092 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1093 continue;
1094
1095 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1096 swrdev = sw_to_rio_dev(rswitch);
1097
1098 /* Skip if destid ends in empty switch*/
1099 if (swrdev->destid == destid)
1100 continue;
1101
1102 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1103
1104 if (rswitch->add_entry) {
1105 rio_route_add_entry(swrdev,
1106 RIO_GLOBAL_TABLE, destid,
1107 sport, 0);
1108 rswitch->route_table[destid] = sport;
1109 }
1110 }
1111 }
1112 }
1113 }
1114
1115 /**
1116 * rio_init_em - Initializes RIO Error Management (for switches)
1117 * @rdev: RIO device
1118 *
1119 * For each enumerated switch, call device-specific error management
1120 * initialization routine (if supplied by the switch driver).
1121 */
1122 static void rio_init_em(struct rio_dev *rdev)
1123 {
1124 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1125 (rdev->rswitch->em_init)) {
1126 rdev->rswitch->em_init(rdev);
1127 }
1128 }
1129
1130 /**
1131 * rio_pw_enable - Enables/disables port-write handling by a master port
1132 * @port: Master port associated with port-write handling
1133 * @enable: 1=enable, 0=disable
1134 */
1135 static void rio_pw_enable(struct rio_mport *port, int enable)
1136 {
1137 if (port->ops->pwenable)
1138 port->ops->pwenable(port, enable);
1139 }
1140
1141 /**
1142 * rio_enum_mport- Start enumeration through a master port
1143 * @mport: Master port to send transactions
1144 *
1145 * Starts the enumeration process. If somebody has enumerated our
1146 * master port device, then give up. If not and we have an active
1147 * link, then start recursive peer enumeration. Returns %0 if
1148 * enumeration succeeds or %-EBUSY if enumeration fails.
1149 */
1150 int __devinit rio_enum_mport(struct rio_mport *mport)
1151 {
1152 struct rio_net *net = NULL;
1153 int rc = 0;
1154
1155 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1156 mport->name);
1157 /* If somebody else enumerated our master port device, bail. */
1158 if (rio_enum_host(mport) < 0) {
1159 printk(KERN_INFO
1160 "RIO: master port %d device has been enumerated by a remote host\n",
1161 mport->id);
1162 rc = -EBUSY;
1163 goto out;
1164 }
1165
1166 /* If master port has an active link, allocate net and enum peers */
1167 if (rio_mport_is_active(mport)) {
1168 if (!(net = rio_alloc_net(mport))) {
1169 printk(KERN_ERR "RIO: failed to allocate new net\n");
1170 rc = -ENOMEM;
1171 goto out;
1172 }
1173
1174 /* Enable Input Output Port (transmitter reviever) */
1175 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1176
1177 /* Set component tag for host */
1178 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1179 next_comptag++);
1180
1181 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1182 /* A higher priority host won enumeration, bail. */
1183 printk(KERN_INFO
1184 "RIO: master port %d device has lost enumeration to a remote host\n",
1185 mport->id);
1186 rio_clear_locks(mport);
1187 rc = -EBUSY;
1188 goto out;
1189 }
1190 rio_update_route_tables(mport);
1191 rio_clear_locks(mport);
1192 rio_pw_enable(mport, 1);
1193 } else {
1194 printk(KERN_INFO "RIO: master port %d link inactive\n",
1195 mport->id);
1196 rc = -EINVAL;
1197 }
1198
1199 out:
1200 return rc;
1201 }
1202
1203 /**
1204 * rio_build_route_tables- Generate route tables from switch route entries
1205 *
1206 * For each switch device, generate a route table by copying existing
1207 * route entries from the switch.
1208 */
1209 static void rio_build_route_tables(void)
1210 {
1211 struct rio_dev *rdev;
1212 int i;
1213 u8 sport;
1214
1215 list_for_each_entry(rdev, &rio_devices, global_list)
1216 if (rio_is_switch(rdev)) {
1217 rio_lock_device(rdev->net->hport, rdev->destid,
1218 rdev->hopcount, 1000);
1219 for (i = 0;
1220 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1221 i++) {
1222 if (rio_route_get_entry(rdev,
1223 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1224 continue;
1225 rdev->rswitch->route_table[i] = sport;
1226 }
1227
1228 rio_unlock_device(rdev->net->hport,
1229 rdev->destid,
1230 rdev->hopcount);
1231 }
1232 }
1233
1234 /**
1235 * rio_enum_timeout- Signal that enumeration timed out
1236 * @data: Address of timeout flag.
1237 *
1238 * When the enumeration complete timer expires, set a flag that
1239 * signals to the discovery process that enumeration did not
1240 * complete in a sane amount of time.
1241 */
1242 static void rio_enum_timeout(unsigned long data)
1243 {
1244 /* Enumeration timed out, set flag */
1245 *(int *)data = 1;
1246 }
1247
1248 /**
1249 * rio_disc_mport- Start discovery through a master port
1250 * @mport: Master port to send transactions
1251 *
1252 * Starts the discovery process. If we have an active link,
1253 * then wait for the signal that enumeration is complete.
1254 * When enumeration completion is signaled, start recursive
1255 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1256 * on failure.
1257 */
1258 int __devinit rio_disc_mport(struct rio_mport *mport)
1259 {
1260 struct rio_net *net = NULL;
1261 int enum_timeout_flag = 0;
1262
1263 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1264 mport->name);
1265
1266 /* If master port has an active link, allocate net and discover peers */
1267 if (rio_mport_is_active(mport)) {
1268 if (!(net = rio_alloc_net(mport))) {
1269 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1270 goto bail;
1271 }
1272
1273 pr_debug("RIO: wait for enumeration complete...");
1274
1275 rio_enum_timer.expires =
1276 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1277 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1278 add_timer(&rio_enum_timer);
1279 while (!rio_enum_complete(mport)) {
1280 mdelay(1);
1281 if (enum_timeout_flag) {
1282 del_timer_sync(&rio_enum_timer);
1283 goto timeout;
1284 }
1285 }
1286 del_timer_sync(&rio_enum_timer);
1287
1288 pr_debug("done\n");
1289
1290 /* Read DestID assigned by enumerator */
1291 rio_local_read_config_32(mport, RIO_DID_CSR,
1292 &mport->host_deviceid);
1293 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1294 mport->host_deviceid);
1295
1296 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1297 0, NULL, 0) < 0) {
1298 printk(KERN_INFO
1299 "RIO: master port %d device has failed discovery\n",
1300 mport->id);
1301 goto bail;
1302 }
1303
1304 rio_build_route_tables();
1305 }
1306
1307 return 0;
1308
1309 timeout:
1310 pr_debug("timeout\n");
1311 bail:
1312 return -EBUSY;
1313 }
Linus' kernel tree