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ARM: imx: Add mx53 support to common msl functions.
[linux-2.6.git] / drivers / rapidio / rio-scan.c
blob1eb82c4c712e6c68292e45c2617f3f7af0c7877a
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_switchid = 0;
50 static int next_net = 0;
51 static int next_comptag = 1;
52
53 static struct timer_list rio_enum_timer =
54 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
55
56 static int rio_mport_phys_table[] = {
57 RIO_EFB_PAR_EP_ID,
58 RIO_EFB_PAR_EP_REC_ID,
59 RIO_EFB_SER_EP_ID,
60 RIO_EFB_SER_EP_REC_ID,
61 -1,
62 };
63
64 /**
65 * rio_get_device_id - Get the base/extended device id for a device
66 * @port: RIO master port
67 * @destid: Destination ID of device
68 * @hopcount: Hopcount to device
69 *
70 * Reads the base/extended device id from a device. Returns the
71 * 8/16-bit device ID.
72 */
73 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
74 {
75 u32 result;
76
77 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
78
79 return RIO_GET_DID(port->sys_size, result);
80 }
81
82 /**
83 * rio_set_device_id - Set the base/extended device id for a device
84 * @port: RIO master port
85 * @destid: Destination ID of device
86 * @hopcount: Hopcount to device
87 * @did: Device ID value to be written
88 *
89 * Writes the base/extended device id from a device.
90 */
91 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
92 {
93 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
94 RIO_SET_DID(port->sys_size, did));
95 }
96
97 /**
98 * rio_local_set_device_id - Set the base/extended device id for a port
99 * @port: RIO master port
100 * @did: Device ID value to be written
101 *
102 * Writes the base/extended device id from a device.
103 */
104 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
105 {
106 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
107 did));
108 }
109
110 /**
111 * rio_clear_locks- Release all host locks and signal enumeration complete
112 * @port: Master port to issue transaction
113 *
114 * Marks the component tag CSR on each device with the enumeration
115 * complete flag. When complete, it then release the host locks on
116 * each device. Returns 0 on success or %-EINVAL on failure.
117 */
118 static int rio_clear_locks(struct rio_mport *port)
119 {
120 struct rio_dev *rdev;
121 u32 result;
122 int ret = 0;
123
124 /* Release host device id locks */
125 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
126 port->host_deviceid);
127 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
128 if ((result & 0xffff) != 0xffff) {
129 printk(KERN_INFO
130 "RIO: badness when releasing host lock on master port, result %8.8x\n",
131 result);
132 ret = -EINVAL;
133 }
134 list_for_each_entry(rdev, &rio_devices, global_list) {
135 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
136 port->host_deviceid);
137 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
138 if ((result & 0xffff) != 0xffff) {
139 printk(KERN_INFO
140 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
141 rdev->vid, rdev->did);
142 ret = -EINVAL;
143 }
144
145 /* Mark device as discovered and enable master */
146 rio_read_config_32(rdev,
147 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
148 &result);
149 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
150 rio_write_config_32(rdev,
151 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
152 result);
153 }
154
155 return ret;
156 }
157
158 /**
159 * rio_enum_host- Set host lock and initialize host destination ID
160 * @port: Master port to issue transaction
161 *
162 * Sets the local host master port lock and destination ID register
163 * with the host device ID value. The host device ID value is provided
164 * by the platform. Returns %0 on success or %-1 on failure.
165 */
166 static int rio_enum_host(struct rio_mport *port)
167 {
168 u32 result;
169
170 /* Set master port host device id lock */
171 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
172 port->host_deviceid);
173
174 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
175 if ((result & 0xffff) != port->host_deviceid)
176 return -1;
177
178 /* Set master port destid and init destid ctr */
179 rio_local_set_device_id(port, port->host_deviceid);
180
181 if (next_destid == port->host_deviceid)
182 next_destid++;
183
184 return 0;
185 }
186
187 /**
188 * rio_device_has_destid- Test if a device contains a destination ID register
189 * @port: Master port to issue transaction
190 * @src_ops: RIO device source operations
191 * @dst_ops: RIO device destination operations
192 *
193 * Checks the provided @src_ops and @dst_ops for the necessary transaction
194 * capabilities that indicate whether or not a device will implement a
195 * destination ID register. Returns 1 if true or 0 if false.
196 */
197 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
198 int dst_ops)
199 {
200 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;
201
202 return !!((src_ops | dst_ops) & mask);
203 }
204
205 /**
206 * rio_release_dev- Frees a RIO device struct
207 * @dev: LDM device associated with a RIO device struct
208 *
209 * Gets the RIO device struct associated a RIO device struct.
210 * The RIO device struct is freed.
211 */
212 static void rio_release_dev(struct device *dev)
213 {
214 struct rio_dev *rdev;
215
216 rdev = to_rio_dev(dev);
217 kfree(rdev);
218 }
219
220 /**
221 * rio_is_switch- Tests if a RIO device has switch capabilities
222 * @rdev: RIO device
223 *
224 * Gets the RIO device Processing Element Features register
225 * contents and tests for switch capabilities. Returns 1 if
226 * the device is a switch or 0 if it is not a switch.
227 * The RIO device struct is freed.
228 */
229 static int rio_is_switch(struct rio_dev *rdev)
230 {
231 if (rdev->pef & RIO_PEF_SWITCH)
232 return 1;
233 return 0;
234 }
235
236 /**
237 * rio_switch_init - Sets switch operations for a particular vendor switch
238 * @rdev: RIO device
239 * @do_enum: Enumeration/Discovery mode flag
240 *
241 * Searches the RIO switch ops table for known switch types. If the vid
242 * and did match a switch table entry, then call switch initialization
243 * routine to setup switch-specific routines.
244 */
245 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
246 {
247 struct rio_switch_ops *cur = __start_rio_switch_ops;
248 struct rio_switch_ops *end = __end_rio_switch_ops;
249
250 while (cur < end) {
251 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
252 pr_debug("RIO: calling init routine for %s\n",
253 rio_name(rdev));
254 cur->init_hook(rdev, do_enum);
255 break;
256 }
257 cur++;
258 }
259
260 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
261 pr_debug("RIO: adding STD routing ops for %s\n",
262 rio_name(rdev));
263 rdev->rswitch->add_entry = rio_std_route_add_entry;
264 rdev->rswitch->get_entry = rio_std_route_get_entry;
265 rdev->rswitch->clr_table = rio_std_route_clr_table;
266 }
267
268 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
269 printk(KERN_ERR "RIO: missing routing ops for %s\n",
270 rio_name(rdev));
271 }
272
273 /**
274 * rio_add_device- Adds a RIO device to the device model
275 * @rdev: RIO device
276 *
277 * Adds the RIO device to the global device list and adds the RIO
278 * device to the RIO device list. Creates the generic sysfs nodes
279 * for an RIO device.
280 */
281 static int __devinit rio_add_device(struct rio_dev *rdev)
282 {
283 int err;
284
285 err = device_add(&rdev->dev);
286 if (err)
287 return err;
288
289 spin_lock(&rio_global_list_lock);
290 list_add_tail(&rdev->global_list, &rio_devices);
291 spin_unlock(&rio_global_list_lock);
292
293 rio_create_sysfs_dev_files(rdev);
294
295 return 0;
296 }
297
298 /**
299 * rio_enable_rx_tx_port - enable input reciever and output transmitter of
300 * given port
301 * @port: Master port associated with the RIO network
302 * @local: local=1 select local port otherwise a far device is reached
303 * @destid: Destination ID of the device to check host bit
304 * @hopcount: Number of hops to reach the target
305 * @port_num: Port (-number on switch) to enable on a far end device
306 *
307 * Returns 0 or 1 from on General Control Command and Status Register
308 * (EXT_PTR+0x3C)
309 */
310 inline int rio_enable_rx_tx_port(struct rio_mport *port,
311 int local, u16 destid,
312 u8 hopcount, u8 port_num) {
313 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
314 u32 regval;
315 u32 ext_ftr_ptr;
316
317 /*
318 * enable rx input tx output port
319 */
320 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
321 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
322
323 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
324
325 if (local) {
326 rio_local_read_config_32(port, ext_ftr_ptr +
327 RIO_PORT_N_CTL_CSR(0),
328 &regval);
329 } else {
330 if (rio_mport_read_config_32(port, destid, hopcount,
331 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
332 return -EIO;
333 }
334
335 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
336 /* serial */
337 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
338 | RIO_PORT_N_CTL_EN_TX_SER;
339 } else {
340 /* parallel */
341 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
342 | RIO_PORT_N_CTL_EN_TX_PAR;
343 }
344
345 if (local) {
346 rio_local_write_config_32(port, ext_ftr_ptr +
347 RIO_PORT_N_CTL_CSR(0), regval);
348 } else {
349 if (rio_mport_write_config_32(port, destid, hopcount,
350 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
351 return -EIO;
352 }
353 #endif
354 return 0;
355 }
356
357 /**
358 * rio_setup_device- Allocates and sets up a RIO device
359 * @net: RIO network
360 * @port: Master port to send transactions
361 * @destid: Current destination ID
362 * @hopcount: Current hopcount
363 * @do_enum: Enumeration/Discovery mode flag
364 *
365 * Allocates a RIO device and configures fields based on configuration
366 * space contents. If device has a destination ID register, a destination
367 * ID is either assigned in enumeration mode or read from configuration
368 * space in discovery mode. If the device has switch capabilities, then
369 * a switch is allocated and configured appropriately. Returns a pointer
370 * to a RIO device on success or NULL on failure.
371 *
372 */
373 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
374 struct rio_mport *port, u16 destid,
375 u8 hopcount, int do_enum)
376 {
377 int ret = 0;
378 struct rio_dev *rdev;
379 struct rio_switch *rswitch = NULL;
380 int result, rdid;
381
382 rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
383 if (!rdev)
384 return NULL;
385
386 rdev->net = net;
387 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
388 &result);
389 rdev->did = result >> 16;
390 rdev->vid = result & 0xffff;
391 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
392 &rdev->device_rev);
393 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
394 &result);
395 rdev->asm_did = result >> 16;
396 rdev->asm_vid = result & 0xffff;
397 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
398 &result);
399 rdev->asm_rev = result >> 16;
400 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
401 &rdev->pef);
402 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
403 rdev->efptr = result & 0xffff;
404 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
405 hopcount);
406
407 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
408 hopcount, RIO_EFB_ERR_MGMNT);
409 }
410
411 if (rdev->pef & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
412 rio_mport_read_config_32(port, destid, hopcount,
413 RIO_SWP_INFO_CAR, &rdev->swpinfo);
414 }
415
416 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
417 &rdev->src_ops);
418 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
419 &rdev->dst_ops);
420
421 if (do_enum) {
422 /* Assign component tag to device */
423 if (next_comptag >= 0x10000) {
424 pr_err("RIO: Component Tag Counter Overflow\n");
425 goto cleanup;
426 }
427 rio_mport_write_config_32(port, destid, hopcount,
428 RIO_COMPONENT_TAG_CSR, next_comptag);
429 rdev->comp_tag = next_comptag++;
430 }
431
432 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
433 if (do_enum) {
434 rio_set_device_id(port, destid, hopcount, next_destid);
435 rdev->destid = next_destid++;
436 if (next_destid == port->host_deviceid)
437 next_destid++;
438 } else
439 rdev->destid = rio_get_device_id(port, destid, hopcount);
440 } else
441 /* Switch device has an associated destID */
442 rdev->destid = RIO_INVALID_DESTID;
443
444 /* If a PE has both switch and other functions, show it as a switch */
445 if (rio_is_switch(rdev)) {
446 rswitch = kzalloc(sizeof(*rswitch) +
447 RIO_GET_TOTAL_PORTS(rdev->swpinfo) *
448 sizeof(rswitch->nextdev[0]),
449 GFP_KERNEL);
450 if (!rswitch)
451 goto cleanup;
452 rswitch->switchid = next_switchid;
453 rswitch->hopcount = hopcount;
454 rswitch->destid = destid;
455 rswitch->port_ok = 0;
456 rswitch->route_table = kzalloc(sizeof(u8)*
457 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
458 GFP_KERNEL);
459 if (!rswitch->route_table)
460 goto cleanup;
461 /* Initialize switch route table */
462 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
463 rdid++)
464 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
465 rdev->rswitch = rswitch;
466 rswitch->rdev = rdev;
467 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
468 rdev->rswitch->switchid);
469 rio_switch_init(rdev, do_enum);
470
471 if (do_enum && rdev->rswitch->clr_table)
472 rdev->rswitch->clr_table(port, destid, hopcount,
473 RIO_GLOBAL_TABLE);
474
475 list_add_tail(&rswitch->node, &rio_switches);
476
477 } else {
478 if (do_enum)
479 /*Enable Input Output Port (transmitter reviever)*/
480 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
481
482 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
483 rdev->destid);
484 }
485
486 rdev->dev.bus = &rio_bus_type;
487 rdev->dev.parent = &rio_bus;
488
489 device_initialize(&rdev->dev);
490 rdev->dev.release = rio_release_dev;
491 rio_dev_get(rdev);
492
493 rdev->dma_mask = DMA_BIT_MASK(32);
494 rdev->dev.dma_mask = &rdev->dma_mask;
495 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
496
497 if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
498 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
499 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
500 0, 0xffff);
501
502 ret = rio_add_device(rdev);
503 if (ret)
504 goto cleanup;
505
506 return rdev;
507
508 cleanup:
509 if (rswitch) {
510 kfree(rswitch->route_table);
511 kfree(rswitch);
512 }
513 kfree(rdev);
514 return NULL;
515 }
516
517 /**
518 * rio_sport_is_active- Tests if a switch port has an active connection.
519 * @port: Master port to send transaction
520 * @destid: Associated destination ID for switch
521 * @hopcount: Hopcount to reach switch
522 * @sport: Switch port number
523 *
524 * Reads the port error status CSR for a particular switch port to
525 * determine if the port has an active link. Returns
526 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
527 * inactive.
528 */
529 static int
530 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
531 {
532 u32 result = 0;
533 u32 ext_ftr_ptr;
534
535 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
536
537 while (ext_ftr_ptr) {
538 rio_mport_read_config_32(port, destid, hopcount,
539 ext_ftr_ptr, &result);
540 result = RIO_GET_BLOCK_ID(result);
541 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
542 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
543 (result == RIO_EFB_SER_EP_FREC_ID))
544 break;
545
546 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
547 ext_ftr_ptr);
548 }
549
550 if (ext_ftr_ptr)
551 rio_mport_read_config_32(port, destid, hopcount,
552 ext_ftr_ptr +
553 RIO_PORT_N_ERR_STS_CSR(sport),
554 &result);
555
556 return result & RIO_PORT_N_ERR_STS_PORT_OK;
557 }
558
559 /**
560 * rio_lock_device - Acquires host device lock for specified device
561 * @port: Master port to send transaction
562 * @destid: Destination ID for device/switch
563 * @hopcount: Hopcount to reach switch
564 * @wait_ms: Max wait time in msec (0 = no timeout)
565 *
566 * Attepts to acquire host device lock for specified device
567 * Returns 0 if device lock acquired or EINVAL if timeout expires.
568 */
569 static int
570 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
571 {
572 u32 result;
573 int tcnt = 0;
574
575 /* Attempt to acquire device lock */
576 rio_mport_write_config_32(port, destid, hopcount,
577 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
578 rio_mport_read_config_32(port, destid, hopcount,
579 RIO_HOST_DID_LOCK_CSR, &result);
580
581 while (result != port->host_deviceid) {
582 if (wait_ms != 0 && tcnt == wait_ms) {
583 pr_debug("RIO: timeout when locking device %x:%x\n",
584 destid, hopcount);
585 return -EINVAL;
586 }
587
588 /* Delay a bit */
589 mdelay(1);
590 tcnt++;
591 /* Try to acquire device lock again */
592 rio_mport_write_config_32(port, destid,
593 hopcount,
594 RIO_HOST_DID_LOCK_CSR,
595 port->host_deviceid);
596 rio_mport_read_config_32(port, destid,
597 hopcount,
598 RIO_HOST_DID_LOCK_CSR, &result);
599 }
600
601 return 0;
602 }
603
604 /**
605 * rio_unlock_device - Releases host device lock for specified device
606 * @port: Master port to send transaction
607 * @destid: Destination ID for device/switch
608 * @hopcount: Hopcount to reach switch
609 *
610 * Returns 0 if device lock released or EINVAL if fails.
611 */
612 static int
613 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
614 {
615 u32 result;
616
617 /* Release device lock */
618 rio_mport_write_config_32(port, destid,
619 hopcount,
620 RIO_HOST_DID_LOCK_CSR,
621 port->host_deviceid);
622 rio_mport_read_config_32(port, destid, hopcount,
623 RIO_HOST_DID_LOCK_CSR, &result);
624 if ((result & 0xffff) != 0xffff) {
625 pr_debug("RIO: badness when releasing device lock %x:%x\n",
626 destid, hopcount);
627 return -EINVAL;
628 }
629
630 return 0;
631 }
632
633 /**
634 * rio_route_add_entry- Add a route entry to a switch routing table
635 * @mport: Master port to send transaction
636 * @rswitch: Switch device
637 * @table: Routing table ID
638 * @route_destid: Destination ID to be routed
639 * @route_port: Port number to be routed
640 * @lock: lock switch device flag
641 *
642 * Calls the switch specific add_entry() method to add a route entry
643 * on a switch. The route table can be specified using the @table
644 * argument if a switch has per port routing tables or the normal
645 * use is to specific all tables (or the global table) by passing
646 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
647 * on failure.
648 */
649 static int
650 rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
651 u16 table, u16 route_destid, u8 route_port, int lock)
652 {
653 int rc;
654
655 if (lock) {
656 rc = rio_lock_device(mport, rswitch->destid,
657 rswitch->hopcount, 1000);
658 if (rc)
659 return rc;
660 }
661
662 rc = rswitch->add_entry(mport, rswitch->destid,
663 rswitch->hopcount, table,
664 route_destid, route_port);
665 if (lock)
666 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
667
668 return rc;
669 }
670
671 /**
672 * rio_route_get_entry- Read a route entry in a switch routing table
673 * @mport: Master port to send transaction
674 * @rswitch: Switch device
675 * @table: Routing table ID
676 * @route_destid: Destination ID to be routed
677 * @route_port: Pointer to read port number into
678 * @lock: lock switch device flag
679 *
680 * Calls the switch specific get_entry() method to read a route entry
681 * in a switch. The route table can be specified using the @table
682 * argument if a switch has per port routing tables or the normal
683 * use is to specific all tables (or the global table) by passing
684 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
685 * on failure.
686 */
687 static int
688 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
689 u16 route_destid, u8 *route_port, int lock)
690 {
691 int rc;
692
693 if (lock) {
694 rc = rio_lock_device(mport, rswitch->destid,
695 rswitch->hopcount, 1000);
696 if (rc)
697 return rc;
698 }
699
700 rc = rswitch->get_entry(mport, rswitch->destid,
701 rswitch->hopcount, table,
702 route_destid, route_port);
703 if (lock)
704 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
705
706 return rc;
707 }
708
709 /**
710 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
711 * @port: Master port to send transaction
712 * @hopcount: Number of hops to the device
713 *
714 * Used during enumeration to read the Host Device ID Lock CSR on a
715 * RIO device. Returns the value of the lock register.
716 */
717 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
718 {
719 u32 result;
720
721 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
722 RIO_HOST_DID_LOCK_CSR, &result);
723
724 return (u16) (result & 0xffff);
725 }
726
727 /**
728 * rio_enum_peer- Recursively enumerate a RIO network through a master port
729 * @net: RIO network being enumerated
730 * @port: Master port to send transactions
731 * @hopcount: Number of hops into the network
732 * @prev: Previous RIO device connected to the enumerated one
733 * @prev_port: Port on previous RIO device
734 *
735 * Recursively enumerates a RIO network. Transactions are sent via the
736 * master port passed in @port.
737 */
738 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
739 u8 hopcount, struct rio_dev *prev, int prev_port)
740 {
741 int port_num;
742 int cur_destid;
743 int sw_destid;
744 int sw_inport;
745 struct rio_dev *rdev;
746 u16 destid;
747 u32 regval;
748 int tmp;
749
750 if (rio_mport_chk_dev_access(port,
751 RIO_ANY_DESTID(port->sys_size), hopcount)) {
752 pr_debug("RIO: device access check failed\n");
753 return -1;
754 }
755
756 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
757 pr_debug("RIO: PE already discovered by this host\n");
758 /*
759 * Already discovered by this host. Add it as another
760 * link to the existing device.
761 */
762 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
763 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
764
765 if (regval) {
766 rdev = rio_get_comptag((regval & 0xffff), NULL);
767
768 if (rdev && prev && rio_is_switch(prev)) {
769 pr_debug("RIO: redundant path to %s\n",
770 rio_name(rdev));
771 prev->rswitch->nextdev[prev_port] = rdev;
772 }
773 }
774
775 return 0;
776 }
777
778 /* Attempt to acquire device lock */
779 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
780 hopcount,
781 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
782 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
783 < port->host_deviceid) {
784 /* Delay a bit */
785 mdelay(1);
786 /* Attempt to acquire device lock again */
787 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
788 hopcount,
789 RIO_HOST_DID_LOCK_CSR,
790 port->host_deviceid);
791 }
792
793 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
794 pr_debug(
795 "RIO: PE locked by a higher priority host...retreating\n");
796 return -1;
797 }
798
799 /* Setup new RIO device */
800 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
801 hopcount, 1);
802 if (rdev) {
803 /* Add device to the global and bus/net specific list. */
804 list_add_tail(&rdev->net_list, &net->devices);
805 rdev->prev = prev;
806 if (prev && rio_is_switch(prev))
807 prev->rswitch->nextdev[prev_port] = rdev;
808 } else
809 return -1;
810
811 if (rio_is_switch(rdev)) {
812 next_switchid++;
813 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
814 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
815 port->host_deviceid, sw_inport, 0);
816 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
817
818 for (destid = 0; destid < next_destid; destid++) {
819 if (destid == port->host_deviceid)
820 continue;
821 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
822 destid, sw_inport, 0);
823 rdev->rswitch->route_table[destid] = sw_inport;
824 }
825
826 pr_debug(
827 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
828 rio_name(rdev), rdev->vid, rdev->did,
829 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
830 sw_destid = next_destid;
831 for (port_num = 0;
832 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
833 port_num++) {
834 /*Enable Input Output Port (transmitter reviever)*/
835 rio_enable_rx_tx_port(port, 0,
836 RIO_ANY_DESTID(port->sys_size),
837 hopcount, port_num);
838
839 if (sw_inport == port_num) {
840 rdev->rswitch->port_ok |= (1 << port_num);
841 continue;
842 }
843
844 cur_destid = next_destid;
845
846 if (rio_sport_is_active
847 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
848 port_num)) {
849 pr_debug(
850 "RIO: scanning device on port %d\n",
851 port_num);
852 rdev->rswitch->port_ok |= (1 << port_num);
853 rio_route_add_entry(port, rdev->rswitch,
854 RIO_GLOBAL_TABLE,
855 RIO_ANY_DESTID(port->sys_size),
856 port_num, 0);
857
858 if (rio_enum_peer(net, port, hopcount + 1,
859 rdev, port_num) < 0)
860 return -1;
861
862 /* Update routing tables */
863 if (next_destid > cur_destid) {
864 for (destid = cur_destid;
865 destid < next_destid; destid++) {
866 if (destid == port->host_deviceid)
867 continue;
868 rio_route_add_entry(port, rdev->rswitch,
869 RIO_GLOBAL_TABLE,
870 destid,
871 port_num,
872 0);
873 rdev->rswitch->
874 route_table[destid] =
875 port_num;
876 }
877 }
878 } else {
879 /* If switch supports Error Management,
880 * set PORT_LOCKOUT bit for unused port
881 */
882 if (rdev->em_efptr)
883 rio_set_port_lockout(rdev, port_num, 1);
884
885 rdev->rswitch->port_ok &= ~(1 << port_num);
886 }
887 }
888
889 /* Direct Port-write messages to the enumeratiing host */
890 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
891 (rdev->em_efptr)) {
892 rio_write_config_32(rdev,
893 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
894 (port->host_deviceid << 16) |
895 (port->sys_size << 15));
896 }
897
898 rio_init_em(rdev);
899
900 /* Check for empty switch */
901 if (next_destid == sw_destid) {
902 next_destid++;
903 if (next_destid == port->host_deviceid)
904 next_destid++;
905 }
906
907 rdev->rswitch->destid = sw_destid;
908 } else
909 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
910 rio_name(rdev), rdev->vid, rdev->did);
911
912 return 0;
913 }
914
915 /**
916 * rio_enum_complete- Tests if enumeration of a network is complete
917 * @port: Master port to send transaction
918 *
919 * Tests the Component Tag CSR for non-zero value (enumeration
920 * complete flag). Return %1 if enumeration is complete or %0 if
921 * enumeration is incomplete.
922 */
923 static int rio_enum_complete(struct rio_mport *port)
924 {
925 u32 regval;
926
927 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
928 &regval);
929 return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
930 }
931
932 /**
933 * rio_disc_peer- Recursively discovers a RIO network through a master port
934 * @net: RIO network being discovered
935 * @port: Master port to send transactions
936 * @destid: Current destination ID in network
937 * @hopcount: Number of hops into the network
938 *
939 * Recursively discovers a RIO network. Transactions are sent via the
940 * master port passed in @port.
941 */
942 static int __devinit
943 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
944 u8 hopcount)
945 {
946 u8 port_num, route_port;
947 struct rio_dev *rdev;
948 u16 ndestid;
949
950 /* Setup new RIO device */
951 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
952 /* Add device to the global and bus/net specific list. */
953 list_add_tail(&rdev->net_list, &net->devices);
954 } else
955 return -1;
956
957 if (rio_is_switch(rdev)) {
958 next_switchid++;
959
960 /* Associated destid is how we accessed this switch */
961 rdev->rswitch->destid = destid;
962
963 pr_debug(
964 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
965 rio_name(rdev), rdev->vid, rdev->did,
966 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
967 for (port_num = 0;
968 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
969 port_num++) {
970 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
971 continue;
972
973 if (rio_sport_is_active
974 (port, destid, hopcount, port_num)) {
975 pr_debug(
976 "RIO: scanning device on port %d\n",
977 port_num);
978
979 rio_lock_device(port, destid, hopcount, 1000);
980
981 for (ndestid = 0;
982 ndestid < RIO_ANY_DESTID(port->sys_size);
983 ndestid++) {
984 rio_route_get_entry(port, rdev->rswitch,
985 RIO_GLOBAL_TABLE,
986 ndestid,
987 &route_port, 0);
988 if (route_port == port_num)
989 break;
990 }
991
992 if (ndestid == RIO_ANY_DESTID(port->sys_size))
993 continue;
994 rio_unlock_device(port, destid, hopcount);
995 if (rio_disc_peer
996 (net, port, ndestid, hopcount + 1) < 0)
997 return -1;
998 }
999 }
1000 } else
1001 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1002 rio_name(rdev), rdev->vid, rdev->did);
1003
1004 return 0;
1005 }
1006
1007 /**
1008 * rio_mport_is_active- Tests if master port link is active
1009 * @port: Master port to test
1010 *
1011 * Reads the port error status CSR for the master port to
1012 * determine if the port has an active link. Returns
1013 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1014 * or %0 if it is inactive.
1015 */
1016 static int rio_mport_is_active(struct rio_mport *port)
1017 {
1018 u32 result = 0;
1019 u32 ext_ftr_ptr;
1020 int *entry = rio_mport_phys_table;
1021
1022 do {
1023 if ((ext_ftr_ptr =
1024 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1025 break;
1026 } while (*++entry >= 0);
1027
1028 if (ext_ftr_ptr)
1029 rio_local_read_config_32(port,
1030 ext_ftr_ptr +
1031 RIO_PORT_N_ERR_STS_CSR(port->index),
1032 &result);
1033
1034 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1035 }
1036
1037 /**
1038 * rio_alloc_net- Allocate and configure a new RIO network
1039 * @port: Master port associated with the RIO network
1040 *
1041 * Allocates a RIO network structure, initializes per-network
1042 * list heads, and adds the associated master port to the
1043 * network list of associated master ports. Returns a
1044 * RIO network pointer on success or %NULL on failure.
1045 */
1046 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1047 {
1048 struct rio_net *net;
1049
1050 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1051 if (net) {
1052 INIT_LIST_HEAD(&net->node);
1053 INIT_LIST_HEAD(&net->devices);
1054 INIT_LIST_HEAD(&net->mports);
1055 list_add_tail(&port->nnode, &net->mports);
1056 net->hport = port;
1057 net->id = next_net++;
1058 }
1059 return net;
1060 }
1061
1062 /**
1063 * rio_update_route_tables- Updates route tables in switches
1064 * @port: Master port associated with the RIO network
1065 *
1066 * For each enumerated device, ensure that each switch in a system
1067 * has correct routing entries. Add routes for devices that where
1068 * unknown dirung the first enumeration pass through the switch.
1069 */
1070 static void rio_update_route_tables(struct rio_mport *port)
1071 {
1072 struct rio_dev *rdev;
1073 struct rio_switch *rswitch;
1074 u8 sport;
1075 u16 destid;
1076
1077 list_for_each_entry(rdev, &rio_devices, global_list) {
1078
1079 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
1080
1081 list_for_each_entry(rswitch, &rio_switches, node) {
1082
1083 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1084 continue;
1085
1086 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1087 /* Skip if destid ends in empty switch*/
1088 if (rswitch->destid == destid)
1089 continue;
1090
1091 sport = RIO_GET_PORT_NUM(rswitch->rdev->swpinfo);
1092
1093 if (rswitch->add_entry) {
1094 rio_route_add_entry(port, rswitch,
1095 RIO_GLOBAL_TABLE, destid,
1096 sport, 0);
1097 rswitch->route_table[destid] = sport;
1098 }
1099 }
1100 }
1101 }
1102 }
1103
1104 /**
1105 * rio_init_em - Initializes RIO Error Management (for switches)
1106 * @rdev: RIO device
1107 *
1108 * For each enumerated switch, call device-specific error management
1109 * initialization routine (if supplied by the switch driver).
1110 */
1111 static void rio_init_em(struct rio_dev *rdev)
1112 {
1113 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1114 (rdev->rswitch->em_init)) {
1115 rdev->rswitch->em_init(rdev);
1116 }
1117 }
1118
1119 /**
1120 * rio_pw_enable - Enables/disables port-write handling by a master port
1121 * @port: Master port associated with port-write handling
1122 * @enable: 1=enable, 0=disable
1123 */
1124 static void rio_pw_enable(struct rio_mport *port, int enable)
1125 {
1126 if (port->ops->pwenable)
1127 port->ops->pwenable(port, enable);
1128 }
1129
1130 /**
1131 * rio_enum_mport- Start enumeration through a master port
1132 * @mport: Master port to send transactions
1133 *
1134 * Starts the enumeration process. If somebody has enumerated our
1135 * master port device, then give up. If not and we have an active
1136 * link, then start recursive peer enumeration. Returns %0 if
1137 * enumeration succeeds or %-EBUSY if enumeration fails.
1138 */
1139 int __devinit rio_enum_mport(struct rio_mport *mport)
1140 {
1141 struct rio_net *net = NULL;
1142 int rc = 0;
1143
1144 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1145 mport->name);
1146 /* If somebody else enumerated our master port device, bail. */
1147 if (rio_enum_host(mport) < 0) {
1148 printk(KERN_INFO
1149 "RIO: master port %d device has been enumerated by a remote host\n",
1150 mport->id);
1151 rc = -EBUSY;
1152 goto out;
1153 }
1154
1155 /* If master port has an active link, allocate net and enum peers */
1156 if (rio_mport_is_active(mport)) {
1157 if (!(net = rio_alloc_net(mport))) {
1158 printk(KERN_ERR "RIO: failed to allocate new net\n");
1159 rc = -ENOMEM;
1160 goto out;
1161 }
1162
1163 /* Enable Input Output Port (transmitter reviever) */
1164 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1165
1166 /* Set component tag for host */
1167 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1168 next_comptag++);
1169
1170 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1171 /* A higher priority host won enumeration, bail. */
1172 printk(KERN_INFO
1173 "RIO: master port %d device has lost enumeration to a remote host\n",
1174 mport->id);
1175 rio_clear_locks(mport);
1176 rc = -EBUSY;
1177 goto out;
1178 }
1179 rio_update_route_tables(mport);
1180 rio_clear_locks(mport);
1181 rio_pw_enable(mport, 1);
1182 } else {
1183 printk(KERN_INFO "RIO: master port %d link inactive\n",
1184 mport->id);
1185 rc = -EINVAL;
1186 }
1187
1188 out:
1189 return rc;
1190 }
1191
1192 /**
1193 * rio_build_route_tables- Generate route tables from switch route entries
1194 *
1195 * For each switch device, generate a route table by copying existing
1196 * route entries from the switch.
1197 */
1198 static void rio_build_route_tables(void)
1199 {
1200 struct rio_dev *rdev;
1201 int i;
1202 u8 sport;
1203
1204 list_for_each_entry(rdev, &rio_devices, global_list)
1205 if (rio_is_switch(rdev)) {
1206 rio_lock_device(rdev->net->hport, rdev->rswitch->destid,
1207 rdev->rswitch->hopcount, 1000);
1208 for (i = 0;
1209 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1210 i++) {
1211 if (rio_route_get_entry
1212 (rdev->net->hport, rdev->rswitch,
1213 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1214 continue;
1215 rdev->rswitch->route_table[i] = sport;
1216 }
1217
1218 rio_unlock_device(rdev->net->hport,
1219 rdev->rswitch->destid,
1220 rdev->rswitch->hopcount);
1221 }
1222 }
1223
1224 /**
1225 * rio_enum_timeout- Signal that enumeration timed out
1226 * @data: Address of timeout flag.
1227 *
1228 * When the enumeration complete timer expires, set a flag that
1229 * signals to the discovery process that enumeration did not
1230 * complete in a sane amount of time.
1231 */
1232 static void rio_enum_timeout(unsigned long data)
1233 {
1234 /* Enumeration timed out, set flag */
1235 *(int *)data = 1;
1236 }
1237
1238 /**
1239 * rio_disc_mport- Start discovery through a master port
1240 * @mport: Master port to send transactions
1241 *
1242 * Starts the discovery process. If we have an active link,
1243 * then wait for the signal that enumeration is complete.
1244 * When enumeration completion is signaled, start recursive
1245 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1246 * on failure.
1247 */
1248 int __devinit rio_disc_mport(struct rio_mport *mport)
1249 {
1250 struct rio_net *net = NULL;
1251 int enum_timeout_flag = 0;
1252
1253 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1254 mport->name);
1255
1256 /* If master port has an active link, allocate net and discover peers */
1257 if (rio_mport_is_active(mport)) {
1258 if (!(net = rio_alloc_net(mport))) {
1259 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1260 goto bail;
1261 }
1262
1263 pr_debug("RIO: wait for enumeration complete...");
1264
1265 rio_enum_timer.expires =
1266 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1267 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1268 add_timer(&rio_enum_timer);
1269 while (!rio_enum_complete(mport)) {
1270 mdelay(1);
1271 if (enum_timeout_flag) {
1272 del_timer_sync(&rio_enum_timer);
1273 goto timeout;
1274 }
1275 }
1276 del_timer_sync(&rio_enum_timer);
1277
1278 pr_debug("done\n");
1279
1280 /* Read DestID assigned by enumerator */
1281 rio_local_read_config_32(mport, RIO_DID_CSR,
1282 &mport->host_deviceid);
1283 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1284 mport->host_deviceid);
1285
1286 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1287 0) < 0) {
1288 printk(KERN_INFO
1289 "RIO: master port %d device has failed discovery\n",
1290 mport->id);
1291 goto bail;
1292 }
1293
1294 rio_build_route_tables();
1295 }
1296
1297 return 0;
1298
1299 timeout:
1300 pr_debug("timeout\n");
1301 bail:
1302 return -EBUSY;
1303 }
Linus' kernel tree