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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / rapidio / rio-scan.c
blob2bebd791a09243703da9d531eda1cec3ebd0941d
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 receiver and output transmitter of
299 * given port
300 * @port: Master port associated with the RIO network
301 * @local: local=1 select local port otherwise a far device is reached
302 * @destid: Destination ID of the device to check host bit
303 * @hopcount: Number of hops to reach the target
304 * @port_num: Port (-number on switch) to enable on a far end device
305 *
306 * Returns 0 or 1 from on General Control Command and Status Register
307 * (EXT_PTR+0x3C)
308 */
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->dst_ops & RIO_DST_OPS_DOORBELL)
509 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
510 0, 0xffff);
511
512 ret = rio_add_device(rdev);
513 if (ret)
514 goto cleanup;
515
516 return rdev;
517
518 cleanup:
519 if (rswitch)
520 kfree(rswitch->route_table);
521
522 kfree(rdev);
523 return NULL;
524 }
525
526 /**
527 * rio_sport_is_active- Tests if a switch port has an active connection.
528 * @port: Master port to send transaction
529 * @destid: Associated destination ID for switch
530 * @hopcount: Hopcount to reach switch
531 * @sport: Switch port number
532 *
533 * Reads the port error status CSR for a particular switch port to
534 * determine if the port has an active link. Returns
535 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
536 * inactive.
537 */
538 static int
539 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
540 {
541 u32 result = 0;
542 u32 ext_ftr_ptr;
543
544 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
545
546 while (ext_ftr_ptr) {
547 rio_mport_read_config_32(port, destid, hopcount,
548 ext_ftr_ptr, &result);
549 result = RIO_GET_BLOCK_ID(result);
550 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
551 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
552 (result == RIO_EFB_SER_EP_FREC_ID))
553 break;
554
555 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
556 ext_ftr_ptr);
557 }
558
559 if (ext_ftr_ptr)
560 rio_mport_read_config_32(port, destid, hopcount,
561 ext_ftr_ptr +
562 RIO_PORT_N_ERR_STS_CSR(sport),
563 &result);
564
565 return result & RIO_PORT_N_ERR_STS_PORT_OK;
566 }
567
568 /**
569 * rio_lock_device - Acquires host device lock for specified device
570 * @port: Master port to send transaction
571 * @destid: Destination ID for device/switch
572 * @hopcount: Hopcount to reach switch
573 * @wait_ms: Max wait time in msec (0 = no timeout)
574 *
575 * Attepts to acquire host device lock for specified device
576 * Returns 0 if device lock acquired or EINVAL if timeout expires.
577 */
578 static int
579 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
580 {
581 u32 result;
582 int tcnt = 0;
583
584 /* Attempt to acquire device lock */
585 rio_mport_write_config_32(port, destid, hopcount,
586 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
587 rio_mport_read_config_32(port, destid, hopcount,
588 RIO_HOST_DID_LOCK_CSR, &result);
589
590 while (result != port->host_deviceid) {
591 if (wait_ms != 0 && tcnt == wait_ms) {
592 pr_debug("RIO: timeout when locking device %x:%x\n",
593 destid, hopcount);
594 return -EINVAL;
595 }
596
597 /* Delay a bit */
598 mdelay(1);
599 tcnt++;
600 /* Try to acquire device lock again */
601 rio_mport_write_config_32(port, destid,
602 hopcount,
603 RIO_HOST_DID_LOCK_CSR,
604 port->host_deviceid);
605 rio_mport_read_config_32(port, destid,
606 hopcount,
607 RIO_HOST_DID_LOCK_CSR, &result);
608 }
609
610 return 0;
611 }
612
613 /**
614 * rio_unlock_device - Releases host device lock for specified device
615 * @port: Master port to send transaction
616 * @destid: Destination ID for device/switch
617 * @hopcount: Hopcount to reach switch
618 *
619 * Returns 0 if device lock released or EINVAL if fails.
620 */
621 static int
622 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
623 {
624 u32 result;
625
626 /* Release device lock */
627 rio_mport_write_config_32(port, destid,
628 hopcount,
629 RIO_HOST_DID_LOCK_CSR,
630 port->host_deviceid);
631 rio_mport_read_config_32(port, destid, hopcount,
632 RIO_HOST_DID_LOCK_CSR, &result);
633 if ((result & 0xffff) != 0xffff) {
634 pr_debug("RIO: badness when releasing device lock %x:%x\n",
635 destid, hopcount);
636 return -EINVAL;
637 }
638
639 return 0;
640 }
641
642 /**
643 * rio_route_add_entry- Add a route entry to a switch routing table
644 * @rdev: RIO device
645 * @table: Routing table ID
646 * @route_destid: Destination ID to be routed
647 * @route_port: Port number to be routed
648 * @lock: lock switch device flag
649 *
650 * Calls the switch specific add_entry() method to add a route entry
651 * on a switch. The route table can be specified using the @table
652 * argument if a switch has per port routing tables or the normal
653 * use is to specific all tables (or the global table) by passing
654 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
655 * on failure.
656 */
657 static int
658 rio_route_add_entry(struct rio_dev *rdev,
659 u16 table, u16 route_destid, u8 route_port, int lock)
660 {
661 int rc;
662
663 if (lock) {
664 rc = rio_lock_device(rdev->net->hport, rdev->destid,
665 rdev->hopcount, 1000);
666 if (rc)
667 return rc;
668 }
669
670 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
671 rdev->hopcount, table,
672 route_destid, route_port);
673 if (lock)
674 rio_unlock_device(rdev->net->hport, rdev->destid,
675 rdev->hopcount);
676
677 return rc;
678 }
679
680 /**
681 * rio_route_get_entry- Read a route entry in a switch routing table
682 * @rdev: RIO device
683 * @table: Routing table ID
684 * @route_destid: Destination ID to be routed
685 * @route_port: Pointer to read port number into
686 * @lock: lock switch device flag
687 *
688 * Calls the switch specific get_entry() method to read a route entry
689 * in a switch. The route table can be specified using the @table
690 * argument if a switch has per port routing tables or the normal
691 * use is to specific all tables (or the global table) by passing
692 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
693 * on failure.
694 */
695 static int
696 rio_route_get_entry(struct rio_dev *rdev, u16 table,
697 u16 route_destid, u8 *route_port, int lock)
698 {
699 int rc;
700
701 if (lock) {
702 rc = rio_lock_device(rdev->net->hport, rdev->destid,
703 rdev->hopcount, 1000);
704 if (rc)
705 return rc;
706 }
707
708 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
709 rdev->hopcount, table,
710 route_destid, route_port);
711 if (lock)
712 rio_unlock_device(rdev->net->hport, rdev->destid,
713 rdev->hopcount);
714
715 return rc;
716 }
717
718 /**
719 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
720 * @port: Master port to send transaction
721 * @hopcount: Number of hops to the device
722 *
723 * Used during enumeration to read the Host Device ID Lock CSR on a
724 * RIO device. Returns the value of the lock register.
725 */
726 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
727 {
728 u32 result;
729
730 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
731 RIO_HOST_DID_LOCK_CSR, &result);
732
733 return (u16) (result & 0xffff);
734 }
735
736 /**
737 * rio_enum_peer- Recursively enumerate a RIO network through a master port
738 * @net: RIO network being enumerated
739 * @port: Master port to send transactions
740 * @hopcount: Number of hops into the network
741 * @prev: Previous RIO device connected to the enumerated one
742 * @prev_port: Port on previous RIO device
743 *
744 * Recursively enumerates a RIO network. Transactions are sent via the
745 * master port passed in @port.
746 */
747 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
748 u8 hopcount, struct rio_dev *prev, int prev_port)
749 {
750 int port_num;
751 int cur_destid;
752 int sw_destid;
753 int sw_inport;
754 struct rio_dev *rdev;
755 u16 destid;
756 u32 regval;
757 int tmp;
758
759 if (rio_mport_chk_dev_access(port,
760 RIO_ANY_DESTID(port->sys_size), hopcount)) {
761 pr_debug("RIO: device access check failed\n");
762 return -1;
763 }
764
765 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
766 pr_debug("RIO: PE already discovered by this host\n");
767 /*
768 * Already discovered by this host. Add it as another
769 * link to the existing device.
770 */
771 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
772 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
773
774 if (regval) {
775 rdev = rio_get_comptag((regval & 0xffff), NULL);
776
777 if (rdev && prev && rio_is_switch(prev)) {
778 pr_debug("RIO: redundant path to %s\n",
779 rio_name(rdev));
780 prev->rswitch->nextdev[prev_port] = rdev;
781 }
782 }
783
784 return 0;
785 }
786
787 /* Attempt to acquire device lock */
788 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
789 hopcount,
790 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
791 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
792 < port->host_deviceid) {
793 /* Delay a bit */
794 mdelay(1);
795 /* Attempt to acquire device lock again */
796 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
797 hopcount,
798 RIO_HOST_DID_LOCK_CSR,
799 port->host_deviceid);
800 }
801
802 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
803 pr_debug(
804 "RIO: PE locked by a higher priority host...retreating\n");
805 return -1;
806 }
807
808 /* Setup new RIO device */
809 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
810 hopcount, 1);
811 if (rdev) {
812 /* Add device to the global and bus/net specific list. */
813 list_add_tail(&rdev->net_list, &net->devices);
814 rdev->prev = prev;
815 if (prev && rio_is_switch(prev))
816 prev->rswitch->nextdev[prev_port] = rdev;
817 } else
818 return -1;
819
820 if (rio_is_switch(rdev)) {
821 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
822 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
823 port->host_deviceid, sw_inport, 0);
824 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
825
826 for (destid = 0; destid < next_destid; destid++) {
827 if (destid == port->host_deviceid)
828 continue;
829 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
830 destid, sw_inport, 0);
831 rdev->rswitch->route_table[destid] = sw_inport;
832 }
833
834 pr_debug(
835 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
836 rio_name(rdev), rdev->vid, rdev->did,
837 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
838 sw_destid = next_destid;
839 for (port_num = 0;
840 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
841 port_num++) {
842 /*Enable Input Output Port (transmitter reviever)*/
843 rio_enable_rx_tx_port(port, 0,
844 RIO_ANY_DESTID(port->sys_size),
845 hopcount, port_num);
846
847 if (sw_inport == port_num) {
848 rdev->rswitch->port_ok |= (1 << port_num);
849 continue;
850 }
851
852 cur_destid = next_destid;
853
854 if (rio_sport_is_active
855 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
856 port_num)) {
857 pr_debug(
858 "RIO: scanning device on port %d\n",
859 port_num);
860 rdev->rswitch->port_ok |= (1 << port_num);
861 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
862 RIO_ANY_DESTID(port->sys_size),
863 port_num, 0);
864
865 if (rio_enum_peer(net, port, hopcount + 1,
866 rdev, port_num) < 0)
867 return -1;
868
869 /* Update routing tables */
870 if (next_destid > cur_destid) {
871 for (destid = cur_destid;
872 destid < next_destid; destid++) {
873 if (destid == port->host_deviceid)
874 continue;
875 rio_route_add_entry(rdev,
876 RIO_GLOBAL_TABLE,
877 destid,
878 port_num,
879 0);
880 rdev->rswitch->
881 route_table[destid] =
882 port_num;
883 }
884 }
885 } else {
886 /* If switch supports Error Management,
887 * set PORT_LOCKOUT bit for unused port
888 */
889 if (rdev->em_efptr)
890 rio_set_port_lockout(rdev, port_num, 1);
891
892 rdev->rswitch->port_ok &= ~(1 << port_num);
893 }
894 }
895
896 /* Direct Port-write messages to the enumeratiing host */
897 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
898 (rdev->em_efptr)) {
899 rio_write_config_32(rdev,
900 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
901 (port->host_deviceid << 16) |
902 (port->sys_size << 15));
903 }
904
905 rio_init_em(rdev);
906
907 /* Check for empty switch */
908 if (next_destid == sw_destid) {
909 next_destid++;
910 if (next_destid == port->host_deviceid)
911 next_destid++;
912 }
913
914 rdev->destid = sw_destid;
915 } else
916 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
917 rio_name(rdev), rdev->vid, rdev->did);
918
919 return 0;
920 }
921
922 /**
923 * rio_enum_complete- Tests if enumeration of a network is complete
924 * @port: Master port to send transaction
925 *
926 * Tests the PGCCSR discovered bit for non-zero value (enumeration
927 * complete flag). Return %1 if enumeration is complete or %0 if
928 * enumeration is incomplete.
929 */
930 static int rio_enum_complete(struct rio_mport *port)
931 {
932 u32 regval;
933
934 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
935 &regval);
936 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
937 }
938
939 /**
940 * rio_disc_peer- Recursively discovers a RIO network through a master port
941 * @net: RIO network being discovered
942 * @port: Master port to send transactions
943 * @destid: Current destination ID in network
944 * @hopcount: Number of hops into the network
945 * @prev: previous rio_dev
946 * @prev_port: previous port number
947 *
948 * Recursively discovers a RIO network. Transactions are sent via the
949 * master port passed in @port.
950 */
951 static int __devinit
952 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
953 u8 hopcount, struct rio_dev *prev, int prev_port)
954 {
955 u8 port_num, route_port;
956 struct rio_dev *rdev;
957 u16 ndestid;
958
959 /* Setup new RIO device */
960 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
961 /* Add device to the global and bus/net specific list. */
962 list_add_tail(&rdev->net_list, &net->devices);
963 rdev->prev = prev;
964 if (prev && rio_is_switch(prev))
965 prev->rswitch->nextdev[prev_port] = rdev;
966 } else
967 return -1;
968
969 if (rio_is_switch(rdev)) {
970 /* Associated destid is how we accessed this switch */
971 rdev->destid = destid;
972
973 pr_debug(
974 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
975 rio_name(rdev), rdev->vid, rdev->did,
976 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
977 for (port_num = 0;
978 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
979 port_num++) {
980 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
981 continue;
982
983 if (rio_sport_is_active
984 (port, destid, hopcount, port_num)) {
985 pr_debug(
986 "RIO: scanning device on port %d\n",
987 port_num);
988
989 rio_lock_device(port, destid, hopcount, 1000);
990
991 for (ndestid = 0;
992 ndestid < RIO_ANY_DESTID(port->sys_size);
993 ndestid++) {
994 rio_route_get_entry(rdev,
995 RIO_GLOBAL_TABLE,
996 ndestid,
997 &route_port, 0);
998 if (route_port == port_num)
999 break;
1000 }
1001
1002 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1003 continue;
1004 rio_unlock_device(port, destid, hopcount);
1005 if (rio_disc_peer(net, port, ndestid,
1006 hopcount + 1, rdev, port_num) < 0)
1007 return -1;
1008 }
1009 }
1010 } else
1011 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1012 rio_name(rdev), rdev->vid, rdev->did);
1013
1014 return 0;
1015 }
1016
1017 /**
1018 * rio_mport_is_active- Tests if master port link is active
1019 * @port: Master port to test
1020 *
1021 * Reads the port error status CSR for the master port to
1022 * determine if the port has an active link. Returns
1023 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1024 * or %0 if it is inactive.
1025 */
1026 static int rio_mport_is_active(struct rio_mport *port)
1027 {
1028 u32 result = 0;
1029 u32 ext_ftr_ptr;
1030 int *entry = rio_mport_phys_table;
1031
1032 do {
1033 if ((ext_ftr_ptr =
1034 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1035 break;
1036 } while (*++entry >= 0);
1037
1038 if (ext_ftr_ptr)
1039 rio_local_read_config_32(port,
1040 ext_ftr_ptr +
1041 RIO_PORT_N_ERR_STS_CSR(port->index),
1042 &result);
1043
1044 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1045 }
1046
1047 /**
1048 * rio_alloc_net- Allocate and configure a new RIO network
1049 * @port: Master port associated with the RIO network
1050 *
1051 * Allocates a RIO network structure, initializes per-network
1052 * list heads, and adds the associated master port to the
1053 * network list of associated master ports. Returns a
1054 * RIO network pointer on success or %NULL on failure.
1055 */
1056 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1057 {
1058 struct rio_net *net;
1059
1060 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1061 if (net) {
1062 INIT_LIST_HEAD(&net->node);
1063 INIT_LIST_HEAD(&net->devices);
1064 INIT_LIST_HEAD(&net->mports);
1065 list_add_tail(&port->nnode, &net->mports);
1066 net->hport = port;
1067 net->id = next_net++;
1068 }
1069 return net;
1070 }
1071
1072 /**
1073 * rio_update_route_tables- Updates route tables in switches
1074 * @port: Master port associated with the RIO network
1075 *
1076 * For each enumerated device, ensure that each switch in a system
1077 * has correct routing entries. Add routes for devices that where
1078 * unknown dirung the first enumeration pass through the switch.
1079 */
1080 static void rio_update_route_tables(struct rio_mport *port)
1081 {
1082 struct rio_dev *rdev, *swrdev;
1083 struct rio_switch *rswitch;
1084 u8 sport;
1085 u16 destid;
1086
1087 list_for_each_entry(rdev, &rio_devices, global_list) {
1088
1089 destid = rdev->destid;
1090
1091 list_for_each_entry(rswitch, &rio_switches, node) {
1092
1093 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1094 continue;
1095
1096 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1097 swrdev = sw_to_rio_dev(rswitch);
1098
1099 /* Skip if destid ends in empty switch*/
1100 if (swrdev->destid == destid)
1101 continue;
1102
1103 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1104
1105 if (rswitch->add_entry) {
1106 rio_route_add_entry(swrdev,
1107 RIO_GLOBAL_TABLE, destid,
1108 sport, 0);
1109 rswitch->route_table[destid] = sport;
1110 }
1111 }
1112 }
1113 }
1114 }
1115
1116 /**
1117 * rio_init_em - Initializes RIO Error Management (for switches)
1118 * @rdev: RIO device
1119 *
1120 * For each enumerated switch, call device-specific error management
1121 * initialization routine (if supplied by the switch driver).
1122 */
1123 static void rio_init_em(struct rio_dev *rdev)
1124 {
1125 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1126 (rdev->rswitch->em_init)) {
1127 rdev->rswitch->em_init(rdev);
1128 }
1129 }
1130
1131 /**
1132 * rio_pw_enable - Enables/disables port-write handling by a master port
1133 * @port: Master port associated with port-write handling
1134 * @enable: 1=enable, 0=disable
1135 */
1136 static void rio_pw_enable(struct rio_mport *port, int enable)
1137 {
1138 if (port->ops->pwenable)
1139 port->ops->pwenable(port, enable);
1140 }
1141
1142 /**
1143 * rio_enum_mport- Start enumeration through a master port
1144 * @mport: Master port to send transactions
1145 *
1146 * Starts the enumeration process. If somebody has enumerated our
1147 * master port device, then give up. If not and we have an active
1148 * link, then start recursive peer enumeration. Returns %0 if
1149 * enumeration succeeds or %-EBUSY if enumeration fails.
1150 */
1151 int __devinit rio_enum_mport(struct rio_mport *mport)
1152 {
1153 struct rio_net *net = NULL;
1154 int rc = 0;
1155
1156 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1157 mport->name);
1158 /* If somebody else enumerated our master port device, bail. */
1159 if (rio_enum_host(mport) < 0) {
1160 printk(KERN_INFO
1161 "RIO: master port %d device has been enumerated by a remote host\n",
1162 mport->id);
1163 rc = -EBUSY;
1164 goto out;
1165 }
1166
1167 /* If master port has an active link, allocate net and enum peers */
1168 if (rio_mport_is_active(mport)) {
1169 if (!(net = rio_alloc_net(mport))) {
1170 printk(KERN_ERR "RIO: failed to allocate new net\n");
1171 rc = -ENOMEM;
1172 goto out;
1173 }
1174
1175 /* Enable Input Output Port (transmitter reviever) */
1176 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1177
1178 /* Set component tag for host */
1179 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1180 next_comptag++);
1181
1182 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1183 /* A higher priority host won enumeration, bail. */
1184 printk(KERN_INFO
1185 "RIO: master port %d device has lost enumeration to a remote host\n",
1186 mport->id);
1187 rio_clear_locks(mport);
1188 rc = -EBUSY;
1189 goto out;
1190 }
1191 rio_update_route_tables(mport);
1192 rio_clear_locks(mport);
1193 rio_pw_enable(mport, 1);
1194 } else {
1195 printk(KERN_INFO "RIO: master port %d link inactive\n",
1196 mport->id);
1197 rc = -EINVAL;
1198 }
1199
1200 out:
1201 return rc;
1202 }
1203
1204 /**
1205 * rio_build_route_tables- Generate route tables from switch route entries
1206 *
1207 * For each switch device, generate a route table by copying existing
1208 * route entries from the switch.
1209 */
1210 static void rio_build_route_tables(void)
1211 {
1212 struct rio_dev *rdev;
1213 int i;
1214 u8 sport;
1215
1216 list_for_each_entry(rdev, &rio_devices, global_list)
1217 if (rio_is_switch(rdev)) {
1218 rio_lock_device(rdev->net->hport, rdev->destid,
1219 rdev->hopcount, 1000);
1220 for (i = 0;
1221 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1222 i++) {
1223 if (rio_route_get_entry(rdev,
1224 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1225 continue;
1226 rdev->rswitch->route_table[i] = sport;
1227 }
1228
1229 rio_unlock_device(rdev->net->hport,
1230 rdev->destid,
1231 rdev->hopcount);
1232 }
1233 }
1234
1235 /**
1236 * rio_enum_timeout- Signal that enumeration timed out
1237 * @data: Address of timeout flag.
1238 *
1239 * When the enumeration complete timer expires, set a flag that
1240 * signals to the discovery process that enumeration did not
1241 * complete in a sane amount of time.
1242 */
1243 static void rio_enum_timeout(unsigned long data)
1244 {
1245 /* Enumeration timed out, set flag */
1246 *(int *)data = 1;
1247 }
1248
1249 /**
1250 * rio_disc_mport- Start discovery through a master port
1251 * @mport: Master port to send transactions
1252 *
1253 * Starts the discovery process. If we have an active link,
1254 * then wait for the signal that enumeration is complete.
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1257 * on failure.
1258 */
1259 int __devinit rio_disc_mport(struct rio_mport *mport)
1260 {
1261 struct rio_net *net = NULL;
1262 int enum_timeout_flag = 0;
1263
1264 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1265 mport->name);
1266
1267 /* If master port has an active link, allocate net and discover peers */
1268 if (rio_mport_is_active(mport)) {
1269 if (!(net = rio_alloc_net(mport))) {
1270 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1271 goto bail;
1272 }
1273
1274 pr_debug("RIO: wait for enumeration complete...");
1275
1276 rio_enum_timer.expires =
1277 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1278 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1279 add_timer(&rio_enum_timer);
1280 while (!rio_enum_complete(mport)) {
1281 mdelay(1);
1282 if (enum_timeout_flag) {
1283 del_timer_sync(&rio_enum_timer);
1284 goto timeout;
1285 }
1286 }
1287 del_timer_sync(&rio_enum_timer);
1288
1289 pr_debug("done\n");
1290
1291 /* Read DestID assigned by enumerator */
1292 rio_local_read_config_32(mport, RIO_DID_CSR,
1293 &mport->host_deviceid);
1294 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1295 mport->host_deviceid);
1296
1297 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1298 0, NULL, 0) < 0) {
1299 printk(KERN_INFO
1300 "RIO: master port %d device has failed discovery\n",
1301 mport->id);
1302 goto bail;
1303 }
1304
1305 rio_build_route_tables();
1306 }
1307
1308 return 0;
1309
1310 timeout:
1311 pr_debug("timeout\n");
1312 bail:
1313 return -EBUSY;
1314 }