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1/*
2 * RapidIO enumeration and discovery support
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * Copyright 2009 Integrated Device Technology, Inc.
8 * Alex Bounine <alexandre.bounine@idt.com>
9 * - Added Port-Write/Error Management initialization and handling
10 *
11 * Copyright 2009 Sysgo AG
12 * Thomas Moll <thomas.moll@sysgo.com>
13 * - Added Input- Output- enable functionality, to allow full communication
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
19 */
20
21#include <linux/types.h>
22#include <linux/kernel.h>
23
24#include <linux/delay.h>
25#include <linux/dma-mapping.h>
26#include <linux/init.h>
27#include <linux/rio.h>
28#include <linux/rio_drv.h>
29#include <linux/rio_ids.h>
30#include <linux/rio_regs.h>
31#include <linux/module.h>
32#include <linux/spinlock.h>
33#include <linux/timer.h>
34#include <linux/jiffies.h>
35#include <linux/slab.h>
36
37#include "rio.h"
38
39LIST_HEAD(rio_devices);
40static LIST_HEAD(rio_switches);
41
42static void rio_enum_timeout(unsigned long);
43
44static void rio_init_em(struct rio_dev *rdev);
45
46DEFINE_SPINLOCK(rio_global_list_lock);
47
48static int next_destid = 0;
49static int next_net = 0;
50static int next_comptag = 1;
51
52static struct timer_list rio_enum_timer =
53TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
54
55static int rio_mport_phys_table[] = {
56 RIO_EFB_PAR_EP_ID,
57 RIO_EFB_PAR_EP_REC_ID,
58 RIO_EFB_SER_EP_ID,
59 RIO_EFB_SER_EP_REC_ID,
60 -1,
61};
62
63/**
64 * rio_get_device_id - Get the base/extended device id for a device
65 * @port: RIO master port
66 * @destid: Destination ID of device
67 * @hopcount: Hopcount to device
68 *
69 * Reads the base/extended device id from a device. Returns the
70 * 8/16-bit device ID.
71 */
72static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
73{
74 u32 result;
75
76 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
77
78 return RIO_GET_DID(port->sys_size, result);
79}
80
81/**
82 * rio_set_device_id - Set the base/extended device id for a device
83 * @port: RIO master port
84 * @destid: Destination ID of device
85 * @hopcount: Hopcount to device
86 * @did: Device ID value to be written
87 *
88 * Writes the base/extended device id from a device.
89 */
90static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
91{
92 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
93 RIO_SET_DID(port->sys_size, did));
94}
95
96/**
97 * rio_local_set_device_id - Set the base/extended device id for a port
98 * @port: RIO master port
99 * @did: Device ID value to be written
100 *
101 * Writes the base/extended device id from a device.
102 */
103static void rio_local_set_device_id(struct rio_mport *port, u16 did)
104{
105 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
106 did));
107}
108
109/**
110 * rio_clear_locks- Release all host locks and signal enumeration complete
111 * @port: Master port to issue transaction
112 *
113 * Marks the component tag CSR on each device with the enumeration
114 * complete flag. When complete, it then release the host locks on
115 * each device. Returns 0 on success or %-EINVAL on failure.
116 */
117static int rio_clear_locks(struct rio_mport *port)
118{
119 struct rio_dev *rdev;
120 u32 result;
121 int ret = 0;
122
123 /* Release host device id locks */
124 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
125 port->host_deviceid);
126 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
127 if ((result & 0xffff) != 0xffff) {
128 printk(KERN_INFO
129 "RIO: badness when releasing host lock on master port, result %8.8x\n",
130 result);
131 ret = -EINVAL;
132 }
133 list_for_each_entry(rdev, &rio_devices, global_list) {
134 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
135 port->host_deviceid);
136 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
137 if ((result & 0xffff) != 0xffff) {
138 printk(KERN_INFO
139 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
140 rdev->vid, rdev->did);
141 ret = -EINVAL;
142 }
143
144 /* Mark device as discovered and enable master */
145 rio_read_config_32(rdev,
146 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
147 &result);
148 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
149 rio_write_config_32(rdev,
150 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
151 result);
152 }
153
154 return ret;
155}
156
157/**
158 * rio_enum_host- Set host lock and initialize host destination ID
159 * @port: Master port to issue transaction
160 *
161 * Sets the local host master port lock and destination ID register
162 * with the host device ID value. The host device ID value is provided
163 * by the platform. Returns %0 on success or %-1 on failure.
164 */
165static int rio_enum_host(struct rio_mport *port)
166{
167 u32 result;
168
169 /* Set master port host device id lock */
170 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
171 port->host_deviceid);
172
173 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
174 if ((result & 0xffff) != port->host_deviceid)
175 return -1;
176
177 /* Set master port destid and init destid ctr */
178 rio_local_set_device_id(port, port->host_deviceid);
179
180 if (next_destid == port->host_deviceid)
181 next_destid++;
182
183 return 0;
184}
185
186/**
187 * rio_device_has_destid- Test if a device contains a destination ID register
188 * @port: Master port to issue transaction
189 * @src_ops: RIO device source operations
190 * @dst_ops: RIO device destination operations
191 *
192 * Checks the provided @src_ops and @dst_ops for the necessary transaction
193 * capabilities that indicate whether or not a device will implement a
194 * destination ID register. Returns 1 if true or 0 if false.
195 */
196static int rio_device_has_destid(struct rio_mport *port, int src_ops,
197 int dst_ops)
198{
199 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
200
201 return !!((src_ops | dst_ops) & mask);
202}
203
204/**
205 * rio_release_dev- Frees a RIO device struct
206 * @dev: LDM device associated with a RIO device struct
207 *
208 * Gets the RIO device struct associated a RIO device struct.
209 * The RIO device struct is freed.
210 */
211static void rio_release_dev(struct device *dev)
212{
213 struct rio_dev *rdev;
214
215 rdev = to_rio_dev(dev);
216 kfree(rdev);
217}
218
219/**
220 * rio_is_switch- Tests if a RIO device has switch capabilities
221 * @rdev: RIO device
222 *
223 * Gets the RIO device Processing Element Features register
224 * contents and tests for switch capabilities. Returns 1 if
225 * the device is a switch or 0 if it is not a switch.
226 * The RIO device struct is freed.
227 */
228static int rio_is_switch(struct rio_dev *rdev)
229{
230 if (rdev->pef & RIO_PEF_SWITCH)
231 return 1;
232 return 0;
233}
234
235/**
236 * rio_switch_init - Sets switch operations for a particular vendor switch
237 * @rdev: RIO device
238 * @do_enum: Enumeration/Discovery mode flag
239 *
240 * Searches the RIO switch ops table for known switch types. If the vid
241 * and did match a switch table entry, then call switch initialization
242 * routine to setup switch-specific routines.
243 */
244static void rio_switch_init(struct rio_dev *rdev, int do_enum)
245{
246 struct rio_switch_ops *cur = __start_rio_switch_ops;
247 struct rio_switch_ops *end = __end_rio_switch_ops;
248
249 while (cur < end) {
250 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
251 pr_debug("RIO: calling init routine for %s\n",
252 rio_name(rdev));
253 cur->init_hook(rdev, do_enum);
254 break;
255 }
256 cur++;
257 }
258
259 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
260 pr_debug("RIO: adding STD routing ops for %s\n",
261 rio_name(rdev));
262 rdev->rswitch->add_entry = rio_std_route_add_entry;
263 rdev->rswitch->get_entry = rio_std_route_get_entry;
264 rdev->rswitch->clr_table = rio_std_route_clr_table;
265 }
266
267 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
268 printk(KERN_ERR "RIO: missing routing ops for %s\n",
269 rio_name(rdev));
270}
271
272/**
273 * rio_add_device- Adds a RIO device to the device model
274 * @rdev: RIO device
275 *
276 * Adds the RIO device to the global device list and adds the RIO
277 * device to the RIO device list. Creates the generic sysfs nodes
278 * for an RIO device.
279 */
280static int __devinit rio_add_device(struct rio_dev *rdev)
281{
282 int err;
283
284 err = device_add(&rdev->dev);
285 if (err)
286 return err;
287
288 spin_lock(&rio_global_list_lock);
289 list_add_tail(&rdev->global_list, &rio_devices);
290 spin_unlock(&rio_global_list_lock);
291
292 rio_create_sysfs_dev_files(rdev);
293
294 return 0;
295}
296
297/**
298 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
299 * given port
300 * @port: Master port associated with the RIO network
301 * @local: local=1 select local port otherwise a far device is reached
302 * @destid: Destination ID of the device to check host bit
303 * @hopcount: Number of hops to reach the target
304 * @port_num: Port (-number on switch) to enable on a far end device
305 *
306 * Returns 0 or 1 from on General Control Command and Status Register
307 * (EXT_PTR+0x3C)
308 */
309inline int rio_enable_rx_tx_port(struct rio_mport *port,
310 int local, u16 destid,
311 u8 hopcount, u8 port_num) {
312#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
313 u32 regval;
314 u32 ext_ftr_ptr;
315
316 /*
317 * enable rx input tx output port
318 */
319 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
320 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
321
322 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
323
324 if (local) {
325 rio_local_read_config_32(port, ext_ftr_ptr +
326 RIO_PORT_N_CTL_CSR(0),
327 ®val);
328 } else {
329 if (rio_mport_read_config_32(port, destid, hopcount,
330 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
331 return -EIO;
332 }
333
334 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
335 /* serial */
336 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
337 | RIO_PORT_N_CTL_EN_TX_SER;
338 } else {
339 /* parallel */
340 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
341 | RIO_PORT_N_CTL_EN_TX_PAR;
342 }
343
344 if (local) {
345 rio_local_write_config_32(port, ext_ftr_ptr +
346 RIO_PORT_N_CTL_CSR(0), regval);
347 } else {
348 if (rio_mport_write_config_32(port, destid, hopcount,
349 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
350 return -EIO;
351 }
352#endif
353 return 0;
354}
355
356/**
357 * rio_setup_device- Allocates and sets up a RIO device
358 * @net: RIO network
359 * @port: Master port to send transactions
360 * @destid: Current destination ID
361 * @hopcount: Current hopcount
362 * @do_enum: Enumeration/Discovery mode flag
363 *
364 * Allocates a RIO device and configures fields based on configuration
365 * space contents. If device has a destination ID register, a destination
366 * ID is either assigned in enumeration mode or read from configuration
367 * space in discovery mode. If the device has switch capabilities, then
368 * a switch is allocated and configured appropriately. Returns a pointer
369 * to a RIO device on success or NULL on failure.
370 *
371 */
372static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
373 struct rio_mport *port, u16 destid,
374 u8 hopcount, int do_enum)
375{
376 int ret = 0;
377 struct rio_dev *rdev;
378 struct rio_switch *rswitch = NULL;
379 int result, rdid;
380 size_t size;
381 u32 swpinfo = 0;
382
383 size = sizeof(struct rio_dev);
384 if (rio_mport_read_config_32(port, destid, hopcount,
385 RIO_PEF_CAR, &result))
386 return NULL;
387
388 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
389 rio_mport_read_config_32(port, destid, hopcount,
390 RIO_SWP_INFO_CAR, &swpinfo);
391 if (result & RIO_PEF_SWITCH) {
392 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
393 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
394 }
395 }
396
397 rdev = kzalloc(size, GFP_KERNEL);
398 if (!rdev)
399 return NULL;
400
401 rdev->net = net;
402 rdev->pef = result;
403 rdev->swpinfo = swpinfo;
404 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
405 &result);
406 rdev->did = result >> 16;
407 rdev->vid = result & 0xffff;
408 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
409 &rdev->device_rev);
410 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
411 &result);
412 rdev->asm_did = result >> 16;
413 rdev->asm_vid = result & 0xffff;
414 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
415 &result);
416 rdev->asm_rev = result >> 16;
417 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
418 rdev->efptr = result & 0xffff;
419 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
420 hopcount);
421
422 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
423 hopcount, RIO_EFB_ERR_MGMNT);
424 }
425
426 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
427 &rdev->src_ops);
428 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
429 &rdev->dst_ops);
430
431 if (do_enum) {
432 /* Assign component tag to device */
433 if (next_comptag >= 0x10000) {
434 pr_err("RIO: Component Tag Counter Overflow\n");
435 goto cleanup;
436 }
437 rio_mport_write_config_32(port, destid, hopcount,
438 RIO_COMPONENT_TAG_CSR, next_comptag);
439 rdev->comp_tag = next_comptag++;
440 } else {
441 rio_mport_read_config_32(port, destid, hopcount,
442 RIO_COMPONENT_TAG_CSR,
443 &rdev->comp_tag);
444 }
445
446 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
447 if (do_enum) {
448 rio_set_device_id(port, destid, hopcount, next_destid);
449 rdev->destid = next_destid++;
450 if (next_destid == port->host_deviceid)
451 next_destid++;
452 } else
453 rdev->destid = rio_get_device_id(port, destid, hopcount);
454
455 rdev->hopcount = 0xff;
456 } else {
457 /* Switch device has an associated destID which
458 * will be adjusted later
459 */
460 rdev->destid = destid;
461 rdev->hopcount = hopcount;
462 }
463
464 /* If a PE has both switch and other functions, show it as a switch */
465 if (rio_is_switch(rdev)) {
466 rswitch = rdev->rswitch;
467 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
468 rswitch->port_ok = 0;
469 rswitch->route_table = kzalloc(sizeof(u8)*
470 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
471 GFP_KERNEL);
472 if (!rswitch->route_table)
473 goto cleanup;
474 /* Initialize switch route table */
475 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
476 rdid++)
477 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
478 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
479 rswitch->switchid);
480 rio_switch_init(rdev, do_enum);
481
482 if (do_enum && rswitch->clr_table)
483 rswitch->clr_table(port, destid, hopcount,
484 RIO_GLOBAL_TABLE);
485
486 list_add_tail(&rswitch->node, &rio_switches);
487
488 } else {
489 if (do_enum)
490 /*Enable Input Output Port (transmitter reviever)*/
491 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
492
493 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
494 rdev->destid);
495 }
496
497 rdev->dev.bus = &rio_bus_type;
498 rdev->dev.parent = &rio_bus;
499
500 device_initialize(&rdev->dev);
501 rdev->dev.release = rio_release_dev;
502 rio_dev_get(rdev);
503
504 rdev->dma_mask = DMA_BIT_MASK(32);
505 rdev->dev.dma_mask = &rdev->dma_mask;
506 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
507
508 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
509 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
510 0, 0xffff);
511
512 ret = rio_add_device(rdev);
513 if (ret)
514 goto cleanup;
515
516 return rdev;
517
518cleanup:
519 if (rio_is_switch(rdev))
520 kfree(rswitch->route_table);
521
522 kfree(rdev);
523 return NULL;
524}
525
526/**
527 * rio_sport_is_active- Tests if a switch port has an active connection.
528 * @port: Master port to send transaction
529 * @destid: Associated destination ID for switch
530 * @hopcount: Hopcount to reach switch
531 * @sport: Switch port number
532 *
533 * Reads the port error status CSR for a particular switch port to
534 * determine if the port has an active link. Returns
535 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
536 * inactive.
537 */
538static int
539rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
540{
541 u32 result = 0;
542 u32 ext_ftr_ptr;
543
544 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
545
546 while (ext_ftr_ptr) {
547 rio_mport_read_config_32(port, destid, hopcount,
548 ext_ftr_ptr, &result);
549 result = RIO_GET_BLOCK_ID(result);
550 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
551 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
552 (result == RIO_EFB_SER_EP_FREC_ID))
553 break;
554
555 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
556 ext_ftr_ptr);
557 }
558
559 if (ext_ftr_ptr)
560 rio_mport_read_config_32(port, destid, hopcount,
561 ext_ftr_ptr +
562 RIO_PORT_N_ERR_STS_CSR(sport),
563 &result);
564
565 return result & RIO_PORT_N_ERR_STS_PORT_OK;
566}
567
568/**
569 * rio_lock_device - Acquires host device lock for specified device
570 * @port: Master port to send transaction
571 * @destid: Destination ID for device/switch
572 * @hopcount: Hopcount to reach switch
573 * @wait_ms: Max wait time in msec (0 = no timeout)
574 *
575 * Attepts to acquire host device lock for specified device
576 * Returns 0 if device lock acquired or EINVAL if timeout expires.
577 */
578static int
579rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
580{
581 u32 result;
582 int tcnt = 0;
583
584 /* Attempt to acquire device lock */
585 rio_mport_write_config_32(port, destid, hopcount,
586 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
587 rio_mport_read_config_32(port, destid, hopcount,
588 RIO_HOST_DID_LOCK_CSR, &result);
589
590 while (result != port->host_deviceid) {
591 if (wait_ms != 0 && tcnt == wait_ms) {
592 pr_debug("RIO: timeout when locking device %x:%x\n",
593 destid, hopcount);
594 return -EINVAL;
595 }
596
597 /* Delay a bit */
598 mdelay(1);
599 tcnt++;
600 /* Try to acquire device lock again */
601 rio_mport_write_config_32(port, destid,
602 hopcount,
603 RIO_HOST_DID_LOCK_CSR,
604 port->host_deviceid);
605 rio_mport_read_config_32(port, destid,
606 hopcount,
607 RIO_HOST_DID_LOCK_CSR, &result);
608 }
609
610 return 0;
611}
612
613/**
614 * rio_unlock_device - Releases host device lock for specified device
615 * @port: Master port to send transaction
616 * @destid: Destination ID for device/switch
617 * @hopcount: Hopcount to reach switch
618 *
619 * Returns 0 if device lock released or EINVAL if fails.
620 */
621static int
622rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
623{
624 u32 result;
625
626 /* Release device lock */
627 rio_mport_write_config_32(port, destid,
628 hopcount,
629 RIO_HOST_DID_LOCK_CSR,
630 port->host_deviceid);
631 rio_mport_read_config_32(port, destid, hopcount,
632 RIO_HOST_DID_LOCK_CSR, &result);
633 if ((result & 0xffff) != 0xffff) {
634 pr_debug("RIO: badness when releasing device lock %x:%x\n",
635 destid, hopcount);
636 return -EINVAL;
637 }
638
639 return 0;
640}
641
642/**
643 * rio_route_add_entry- Add a route entry to a switch routing table
644 * @rdev: RIO device
645 * @table: Routing table ID
646 * @route_destid: Destination ID to be routed
647 * @route_port: Port number to be routed
648 * @lock: lock switch device flag
649 *
650 * Calls the switch specific add_entry() method to add a route entry
651 * on a switch. The route table can be specified using the @table
652 * argument if a switch has per port routing tables or the normal
653 * use is to specific all tables (or the global table) by passing
654 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
655 * on failure.
656 */
657static int
658rio_route_add_entry(struct rio_dev *rdev,
659 u16 table, u16 route_destid, u8 route_port, int lock)
660{
661 int rc;
662
663 if (lock) {
664 rc = rio_lock_device(rdev->net->hport, rdev->destid,
665 rdev->hopcount, 1000);
666 if (rc)
667 return rc;
668 }
669
670 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
671 rdev->hopcount, table,
672 route_destid, route_port);
673 if (lock)
674 rio_unlock_device(rdev->net->hport, rdev->destid,
675 rdev->hopcount);
676
677 return rc;
678}
679
680/**
681 * rio_route_get_entry- Read a route entry in a switch routing table
682 * @rdev: RIO device
683 * @table: Routing table ID
684 * @route_destid: Destination ID to be routed
685 * @route_port: Pointer to read port number into
686 * @lock: lock switch device flag
687 *
688 * Calls the switch specific get_entry() method to read a route entry
689 * in a switch. The route table can be specified using the @table
690 * argument if a switch has per port routing tables or the normal
691 * use is to specific all tables (or the global table) by passing
692 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
693 * on failure.
694 */
695static int
696rio_route_get_entry(struct rio_dev *rdev, u16 table,
697 u16 route_destid, u8 *route_port, int lock)
698{
699 int rc;
700
701 if (lock) {
702 rc = rio_lock_device(rdev->net->hport, rdev->destid,
703 rdev->hopcount, 1000);
704 if (rc)
705 return rc;
706 }
707
708 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
709 rdev->hopcount, table,
710 route_destid, route_port);
711 if (lock)
712 rio_unlock_device(rdev->net->hport, rdev->destid,
713 rdev->hopcount);
714
715 return rc;
716}
717
718/**
719 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
720 * @port: Master port to send transaction
721 * @hopcount: Number of hops to the device
722 *
723 * Used during enumeration to read the Host Device ID Lock CSR on a
724 * RIO device. Returns the value of the lock register.
725 */
726static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
727{
728 u32 result;
729
730 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
731 RIO_HOST_DID_LOCK_CSR, &result);
732
733 return (u16) (result & 0xffff);
734}
735
736/**
737 * rio_enum_peer- Recursively enumerate a RIO network through a master port
738 * @net: RIO network being enumerated
739 * @port: Master port to send transactions
740 * @hopcount: Number of hops into the network
741 * @prev: Previous RIO device connected to the enumerated one
742 * @prev_port: Port on previous RIO device
743 *
744 * Recursively enumerates a RIO network. Transactions are sent via the
745 * master port passed in @port.
746 */
747static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
748 u8 hopcount, struct rio_dev *prev, int prev_port)
749{
750 int port_num;
751 int cur_destid;
752 int sw_destid;
753 int sw_inport;
754 struct rio_dev *rdev;
755 u16 destid;
756 u32 regval;
757 int tmp;
758
759 if (rio_mport_chk_dev_access(port,
760 RIO_ANY_DESTID(port->sys_size), hopcount)) {
761 pr_debug("RIO: device access check failed\n");
762 return -1;
763 }
764
765 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
766 pr_debug("RIO: PE already discovered by this host\n");
767 /*
768 * Already discovered by this host. Add it as another
769 * link to the existing device.
770 */
771 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
772 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
773
774 if (regval) {
775 rdev = rio_get_comptag((regval & 0xffff), NULL);
776
777 if (rdev && prev && rio_is_switch(prev)) {
778 pr_debug("RIO: redundant path to %s\n",
779 rio_name(rdev));
780 prev->rswitch->nextdev[prev_port] = rdev;
781 }
782 }
783
784 return 0;
785 }
786
787 /* Attempt to acquire device lock */
788 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
789 hopcount,
790 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
791 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
792 < port->host_deviceid) {
793 /* Delay a bit */
794 mdelay(1);
795 /* Attempt to acquire device lock again */
796 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
797 hopcount,
798 RIO_HOST_DID_LOCK_CSR,
799 port->host_deviceid);
800 }
801
802 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
803 pr_debug(
804 "RIO: PE locked by a higher priority host...retreating\n");
805 return -1;
806 }
807
808 /* Setup new RIO device */
809 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
810 hopcount, 1);
811 if (rdev) {
812 /* Add device to the global and bus/net specific list. */
813 list_add_tail(&rdev->net_list, &net->devices);
814 rdev->prev = prev;
815 if (prev && rio_is_switch(prev))
816 prev->rswitch->nextdev[prev_port] = rdev;
817 } else
818 return -1;
819
820 if (rio_is_switch(rdev)) {
821 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
822 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
823 port->host_deviceid, sw_inport, 0);
824 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
825
826 for (destid = 0; destid < next_destid; destid++) {
827 if (destid == port->host_deviceid)
828 continue;
829 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
830 destid, sw_inport, 0);
831 rdev->rswitch->route_table[destid] = sw_inport;
832 }
833
834 pr_debug(
835 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
836 rio_name(rdev), rdev->vid, rdev->did,
837 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
838 sw_destid = next_destid;
839 for (port_num = 0;
840 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
841 port_num++) {
842 /*Enable Input Output Port (transmitter reviever)*/
843 rio_enable_rx_tx_port(port, 0,
844 RIO_ANY_DESTID(port->sys_size),
845 hopcount, port_num);
846
847 if (sw_inport == port_num) {
848 rdev->rswitch->port_ok |= (1 << port_num);
849 continue;
850 }
851
852 cur_destid = next_destid;
853
854 if (rio_sport_is_active
855 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
856 port_num)) {
857 pr_debug(
858 "RIO: scanning device on port %d\n",
859 port_num);
860 rdev->rswitch->port_ok |= (1 << port_num);
861 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
862 RIO_ANY_DESTID(port->sys_size),
863 port_num, 0);
864
865 if (rio_enum_peer(net, port, hopcount + 1,
866 rdev, port_num) < 0)
867 return -1;
868
869 /* Update routing tables */
870 if (next_destid > cur_destid) {
871 for (destid = cur_destid;
872 destid < next_destid; destid++) {
873 if (destid == port->host_deviceid)
874 continue;
875 rio_route_add_entry(rdev,
876 RIO_GLOBAL_TABLE,
877 destid,
878 port_num,
879 0);
880 rdev->rswitch->
881 route_table[destid] =
882 port_num;
883 }
884 }
885 } else {
886 /* If switch supports Error Management,
887 * set PORT_LOCKOUT bit for unused port
888 */
889 if (rdev->em_efptr)
890 rio_set_port_lockout(rdev, port_num, 1);
891
892 rdev->rswitch->port_ok &= ~(1 << port_num);
893 }
894 }
895
896 /* Direct Port-write messages to the enumeratiing host */
897 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
898 (rdev->em_efptr)) {
899 rio_write_config_32(rdev,
900 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
901 (port->host_deviceid << 16) |
902 (port->sys_size << 15));
903 }
904
905 rio_init_em(rdev);
906
907 /* Check for empty switch */
908 if (next_destid == sw_destid) {
909 next_destid++;
910 if (next_destid == port->host_deviceid)
911 next_destid++;
912 }
913
914 rdev->destid = sw_destid;
915 } else
916 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
917 rio_name(rdev), rdev->vid, rdev->did);
918
919 return 0;
920}
921
922/**
923 * rio_enum_complete- Tests if enumeration of a network is complete
924 * @port: Master port to send transaction
925 *
926 * Tests the Component Tag CSR for non-zero value (enumeration
927 * complete flag). Return %1 if enumeration is complete or %0 if
928 * enumeration is incomplete.
929 */
930static int rio_enum_complete(struct rio_mport *port)
931{
932 u32 regval;
933
934 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
935 ®val);
936 return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
937}
938
939/**
940 * rio_disc_peer- Recursively discovers a RIO network through a master port
941 * @net: RIO network being discovered
942 * @port: Master port to send transactions
943 * @destid: Current destination ID in network
944 * @hopcount: Number of hops into the network
945 * @prev: previous rio_dev
946 * @prev_port: previous port number
947 *
948 * Recursively discovers a RIO network. Transactions are sent via the
949 * master port passed in @port.
950 */
951static int __devinit
952rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
953 u8 hopcount, struct rio_dev *prev, int prev_port)
954{
955 u8 port_num, route_port;
956 struct rio_dev *rdev;
957 u16 ndestid;
958
959 /* Setup new RIO device */
960 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
961 /* Add device to the global and bus/net specific list. */
962 list_add_tail(&rdev->net_list, &net->devices);
963 rdev->prev = prev;
964 if (prev && rio_is_switch(prev))
965 prev->rswitch->nextdev[prev_port] = rdev;
966 } else
967 return -1;
968
969 if (rio_is_switch(rdev)) {
970 /* Associated destid is how we accessed this switch */
971 rdev->destid = destid;
972
973 pr_debug(
974 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
975 rio_name(rdev), rdev->vid, rdev->did,
976 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
977 for (port_num = 0;
978 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
979 port_num++) {
980 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
981 continue;
982
983 if (rio_sport_is_active
984 (port, destid, hopcount, port_num)) {
985 pr_debug(
986 "RIO: scanning device on port %d\n",
987 port_num);
988
989 rio_lock_device(port, destid, hopcount, 1000);
990
991 for (ndestid = 0;
992 ndestid < RIO_ANY_DESTID(port->sys_size);
993 ndestid++) {
994 rio_route_get_entry(rdev,
995 RIO_GLOBAL_TABLE,
996 ndestid,
997 &route_port, 0);
998 if (route_port == port_num)
999 break;
1000 }
1001
1002 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1003 continue;
1004 rio_unlock_device(port, destid, hopcount);
1005 if (rio_disc_peer(net, port, ndestid,
1006 hopcount + 1, rdev, port_num) < 0)
1007 return -1;
1008 }
1009 }
1010 } else
1011 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1012 rio_name(rdev), rdev->vid, rdev->did);
1013
1014 return 0;
1015}
1016
1017/**
1018 * rio_mport_is_active- Tests if master port link is active
1019 * @port: Master port to test
1020 *
1021 * Reads the port error status CSR for the master port to
1022 * determine if the port has an active link. Returns
1023 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1024 * or %0 if it is inactive.
1025 */
1026static int rio_mport_is_active(struct rio_mport *port)
1027{
1028 u32 result = 0;
1029 u32 ext_ftr_ptr;
1030 int *entry = rio_mport_phys_table;
1031
1032 do {
1033 if ((ext_ftr_ptr =
1034 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1035 break;
1036 } while (*++entry >= 0);
1037
1038 if (ext_ftr_ptr)
1039 rio_local_read_config_32(port,
1040 ext_ftr_ptr +
1041 RIO_PORT_N_ERR_STS_CSR(port->index),
1042 &result);
1043
1044 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1045}
1046
1047/**
1048 * rio_alloc_net- Allocate and configure a new RIO network
1049 * @port: Master port associated with the RIO network
1050 *
1051 * Allocates a RIO network structure, initializes per-network
1052 * list heads, and adds the associated master port to the
1053 * network list of associated master ports. Returns a
1054 * RIO network pointer on success or %NULL on failure.
1055 */
1056static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1057{
1058 struct rio_net *net;
1059
1060 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1061 if (net) {
1062 INIT_LIST_HEAD(&net->node);
1063 INIT_LIST_HEAD(&net->devices);
1064 INIT_LIST_HEAD(&net->mports);
1065 list_add_tail(&port->nnode, &net->mports);
1066 net->hport = port;
1067 net->id = next_net++;
1068 }
1069 return net;
1070}
1071
1072/**
1073 * rio_update_route_tables- Updates route tables in switches
1074 * @port: Master port associated with the RIO network
1075 *
1076 * For each enumerated device, ensure that each switch in a system
1077 * has correct routing entries. Add routes for devices that where
1078 * unknown dirung the first enumeration pass through the switch.
1079 */
1080static void rio_update_route_tables(struct rio_mport *port)
1081{
1082 struct rio_dev *rdev, *swrdev;
1083 struct rio_switch *rswitch;
1084 u8 sport;
1085 u16 destid;
1086
1087 list_for_each_entry(rdev, &rio_devices, global_list) {
1088
1089 destid = rdev->destid;
1090
1091 list_for_each_entry(rswitch, &rio_switches, node) {
1092
1093 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1094 continue;
1095
1096 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1097 swrdev = sw_to_rio_dev(rswitch);
1098
1099 /* Skip if destid ends in empty switch*/
1100 if (swrdev->destid == destid)
1101 continue;
1102
1103 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1104
1105 if (rswitch->add_entry) {
1106 rio_route_add_entry(swrdev,
1107 RIO_GLOBAL_TABLE, destid,
1108 sport, 0);
1109 rswitch->route_table[destid] = sport;
1110 }
1111 }
1112 }
1113 }
1114}
1115
1116/**
1117 * rio_init_em - Initializes RIO Error Management (for switches)
1118 * @rdev: RIO device
1119 *
1120 * For each enumerated switch, call device-specific error management
1121 * initialization routine (if supplied by the switch driver).
1122 */
1123static void rio_init_em(struct rio_dev *rdev)
1124{
1125 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1126 (rdev->rswitch->em_init)) {
1127 rdev->rswitch->em_init(rdev);
1128 }
1129}
1130
1131/**
1132 * rio_pw_enable - Enables/disables port-write handling by a master port
1133 * @port: Master port associated with port-write handling
1134 * @enable: 1=enable, 0=disable
1135 */
1136static void rio_pw_enable(struct rio_mport *port, int enable)
1137{
1138 if (port->ops->pwenable)
1139 port->ops->pwenable(port, enable);
1140}
1141
1142/**
1143 * rio_enum_mport- Start enumeration through a master port
1144 * @mport: Master port to send transactions
1145 *
1146 * Starts the enumeration process. If somebody has enumerated our
1147 * master port device, then give up. If not and we have an active
1148 * link, then start recursive peer enumeration. Returns %0 if
1149 * enumeration succeeds or %-EBUSY if enumeration fails.
1150 */
1151int __devinit rio_enum_mport(struct rio_mport *mport)
1152{
1153 struct rio_net *net = NULL;
1154 int rc = 0;
1155
1156 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1157 mport->name);
1158 /* If somebody else enumerated our master port device, bail. */
1159 if (rio_enum_host(mport) < 0) {
1160 printk(KERN_INFO
1161 "RIO: master port %d device has been enumerated by a remote host\n",
1162 mport->id);
1163 rc = -EBUSY;
1164 goto out;
1165 }
1166
1167 /* If master port has an active link, allocate net and enum peers */
1168 if (rio_mport_is_active(mport)) {
1169 if (!(net = rio_alloc_net(mport))) {
1170 printk(KERN_ERR "RIO: failed to allocate new net\n");
1171 rc = -ENOMEM;
1172 goto out;
1173 }
1174
1175 /* Enable Input Output Port (transmitter reviever) */
1176 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1177
1178 /* Set component tag for host */
1179 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1180 next_comptag++);
1181
1182 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1183 /* A higher priority host won enumeration, bail. */
1184 printk(KERN_INFO
1185 "RIO: master port %d device has lost enumeration to a remote host\n",
1186 mport->id);
1187 rio_clear_locks(mport);
1188 rc = -EBUSY;
1189 goto out;
1190 }
1191 rio_update_route_tables(mport);
1192 rio_clear_locks(mport);
1193 rio_pw_enable(mport, 1);
1194 } else {
1195 printk(KERN_INFO "RIO: master port %d link inactive\n",
1196 mport->id);
1197 rc = -EINVAL;
1198 }
1199
1200 out:
1201 return rc;
1202}
1203
1204/**
1205 * rio_build_route_tables- Generate route tables from switch route entries
1206 *
1207 * For each switch device, generate a route table by copying existing
1208 * route entries from the switch.
1209 */
1210static void rio_build_route_tables(void)
1211{
1212 struct rio_dev *rdev;
1213 int i;
1214 u8 sport;
1215
1216 list_for_each_entry(rdev, &rio_devices, global_list)
1217 if (rio_is_switch(rdev)) {
1218 rio_lock_device(rdev->net->hport, rdev->destid,
1219 rdev->hopcount, 1000);
1220 for (i = 0;
1221 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1222 i++) {
1223 if (rio_route_get_entry(rdev,
1224 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1225 continue;
1226 rdev->rswitch->route_table[i] = sport;
1227 }
1228
1229 rio_unlock_device(rdev->net->hport,
1230 rdev->destid,
1231 rdev->hopcount);
1232 }
1233}
1234
1235/**
1236 * rio_enum_timeout- Signal that enumeration timed out
1237 * @data: Address of timeout flag.
1238 *
1239 * When the enumeration complete timer expires, set a flag that
1240 * signals to the discovery process that enumeration did not
1241 * complete in a sane amount of time.
1242 */
1243static void rio_enum_timeout(unsigned long data)
1244{
1245 /* Enumeration timed out, set flag */
1246 *(int *)data = 1;
1247}
1248
1249/**
1250 * rio_disc_mport- Start discovery through a master port
1251 * @mport: Master port to send transactions
1252 *
1253 * Starts the discovery process. If we have an active link,
1254 * then wait for the signal that enumeration is complete.
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1257 * on failure.
1258 */
1259int __devinit rio_disc_mport(struct rio_mport *mport)
1260{
1261 struct rio_net *net = NULL;
1262 int enum_timeout_flag = 0;
1263
1264 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1265 mport->name);
1266
1267 /* If master port has an active link, allocate net and discover peers */
1268 if (rio_mport_is_active(mport)) {
1269 if (!(net = rio_alloc_net(mport))) {
1270 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1271 goto bail;
1272 }
1273
1274 pr_debug("RIO: wait for enumeration complete...");
1275
1276 rio_enum_timer.expires =
1277 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1278 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1279 add_timer(&rio_enum_timer);
1280 while (!rio_enum_complete(mport)) {
1281 mdelay(1);
1282 if (enum_timeout_flag) {
1283 del_timer_sync(&rio_enum_timer);
1284 goto timeout;
1285 }
1286 }
1287 del_timer_sync(&rio_enum_timer);
1288
1289 pr_debug("done\n");
1290
1291 /* Read DestID assigned by enumerator */
1292 rio_local_read_config_32(mport, RIO_DID_CSR,
1293 &mport->host_deviceid);
1294 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1295 mport->host_deviceid);
1296
1297 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1298 0, NULL, 0) < 0) {
1299 printk(KERN_INFO
1300 "RIO: master port %d device has failed discovery\n",
1301 mport->id);
1302 goto bail;
1303 }
1304
1305 rio_build_route_tables();
1306 }
1307
1308 return 0;
1309
1310 timeout:
1311 pr_debug("timeout\n");
1312 bail:
1313 return -EBUSY;
1314}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * RapidIO enumeration and discovery support
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 *
8 * Copyright 2009 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 * - Added Port-Write/Error Management initialization and handling
11 *
12 * Copyright 2009 Sysgo AG
13 * Thomas Moll <thomas.moll@sysgo.com>
14 * - Added Input- Output- enable functionality, to allow full communication
15 */
16
17#include <linux/types.h>
18#include <linux/kernel.h>
19
20#include <linux/delay.h>
21#include <linux/dma-mapping.h>
22#include <linux/init.h>
23#include <linux/rio.h>
24#include <linux/rio_drv.h>
25#include <linux/rio_ids.h>
26#include <linux/rio_regs.h>
27#include <linux/module.h>
28#include <linux/spinlock.h>
29#include <linux/timer.h>
30#include <linux/sched.h>
31#include <linux/jiffies.h>
32#include <linux/slab.h>
33
34#include "rio.h"
35
36static void rio_init_em(struct rio_dev *rdev);
37
38struct rio_id_table {
39 u16 start; /* logical minimal id */
40 u32 max; /* max number of IDs in table */
41 spinlock_t lock;
42 unsigned long table[0];
43};
44
45static int next_destid = 0;
46static int next_comptag = 1;
47
48/**
49 * rio_destid_alloc - Allocate next available destID for given network
50 * @net: RIO network
51 *
52 * Returns next available device destination ID for the specified RIO network.
53 * Marks allocated ID as one in use.
54 * Returns RIO_INVALID_DESTID if new destID is not available.
55 */
56static u16 rio_destid_alloc(struct rio_net *net)
57{
58 int destid;
59 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
60
61 spin_lock(&idtab->lock);
62 destid = find_first_zero_bit(idtab->table, idtab->max);
63
64 if (destid < idtab->max) {
65 set_bit(destid, idtab->table);
66 destid += idtab->start;
67 } else
68 destid = RIO_INVALID_DESTID;
69
70 spin_unlock(&idtab->lock);
71 return (u16)destid;
72}
73
74/**
75 * rio_destid_reserve - Reserve the specified destID
76 * @net: RIO network
77 * @destid: destID to reserve
78 *
79 * Tries to reserve the specified destID.
80 * Returns 0 if successful.
81 */
82static int rio_destid_reserve(struct rio_net *net, u16 destid)
83{
84 int oldbit;
85 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
86
87 destid -= idtab->start;
88 spin_lock(&idtab->lock);
89 oldbit = test_and_set_bit(destid, idtab->table);
90 spin_unlock(&idtab->lock);
91 return oldbit;
92}
93
94/**
95 * rio_destid_free - free a previously allocated destID
96 * @net: RIO network
97 * @destid: destID to free
98 *
99 * Makes the specified destID available for use.
100 */
101static void rio_destid_free(struct rio_net *net, u16 destid)
102{
103 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
104
105 destid -= idtab->start;
106 spin_lock(&idtab->lock);
107 clear_bit(destid, idtab->table);
108 spin_unlock(&idtab->lock);
109}
110
111/**
112 * rio_destid_first - return first destID in use
113 * @net: RIO network
114 */
115static u16 rio_destid_first(struct rio_net *net)
116{
117 int destid;
118 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
119
120 spin_lock(&idtab->lock);
121 destid = find_first_bit(idtab->table, idtab->max);
122 if (destid >= idtab->max)
123 destid = RIO_INVALID_DESTID;
124 else
125 destid += idtab->start;
126 spin_unlock(&idtab->lock);
127 return (u16)destid;
128}
129
130/**
131 * rio_destid_next - return next destID in use
132 * @net: RIO network
133 * @from: destination ID from which search shall continue
134 */
135static u16 rio_destid_next(struct rio_net *net, u16 from)
136{
137 int destid;
138 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
139
140 spin_lock(&idtab->lock);
141 destid = find_next_bit(idtab->table, idtab->max, from);
142 if (destid >= idtab->max)
143 destid = RIO_INVALID_DESTID;
144 else
145 destid += idtab->start;
146 spin_unlock(&idtab->lock);
147 return (u16)destid;
148}
149
150/**
151 * rio_get_device_id - Get the base/extended device id for a device
152 * @port: RIO master port
153 * @destid: Destination ID of device
154 * @hopcount: Hopcount to device
155 *
156 * Reads the base/extended device id from a device. Returns the
157 * 8/16-bit device ID.
158 */
159static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
160{
161 u32 result;
162
163 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
164
165 return RIO_GET_DID(port->sys_size, result);
166}
167
168/**
169 * rio_set_device_id - Set the base/extended device id for a device
170 * @port: RIO master port
171 * @destid: Destination ID of device
172 * @hopcount: Hopcount to device
173 * @did: Device ID value to be written
174 *
175 * Writes the base/extended device id from a device.
176 */
177static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
178{
179 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
180 RIO_SET_DID(port->sys_size, did));
181}
182
183/**
184 * rio_clear_locks- Release all host locks and signal enumeration complete
185 * @net: RIO network to run on
186 *
187 * Marks the component tag CSR on each device with the enumeration
188 * complete flag. When complete, it then release the host locks on
189 * each device. Returns 0 on success or %-EINVAL on failure.
190 */
191static int rio_clear_locks(struct rio_net *net)
192{
193 struct rio_mport *port = net->hport;
194 struct rio_dev *rdev;
195 u32 result;
196 int ret = 0;
197
198 /* Release host device id locks */
199 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
200 port->host_deviceid);
201 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
202 if ((result & 0xffff) != 0xffff) {
203 printk(KERN_INFO
204 "RIO: badness when releasing host lock on master port, result %8.8x\n",
205 result);
206 ret = -EINVAL;
207 }
208 list_for_each_entry(rdev, &net->devices, net_list) {
209 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
210 port->host_deviceid);
211 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
212 if ((result & 0xffff) != 0xffff) {
213 printk(KERN_INFO
214 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
215 rdev->vid, rdev->did);
216 ret = -EINVAL;
217 }
218
219 /* Mark device as discovered and enable master */
220 rio_read_config_32(rdev,
221 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
222 &result);
223 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
224 rio_write_config_32(rdev,
225 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
226 result);
227 }
228
229 return ret;
230}
231
232/**
233 * rio_enum_host- Set host lock and initialize host destination ID
234 * @port: Master port to issue transaction
235 *
236 * Sets the local host master port lock and destination ID register
237 * with the host device ID value. The host device ID value is provided
238 * by the platform. Returns %0 on success or %-1 on failure.
239 */
240static int rio_enum_host(struct rio_mport *port)
241{
242 u32 result;
243
244 /* Set master port host device id lock */
245 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
246 port->host_deviceid);
247
248 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
249 if ((result & 0xffff) != port->host_deviceid)
250 return -1;
251
252 /* Set master port destid and init destid ctr */
253 rio_local_set_device_id(port, port->host_deviceid);
254 return 0;
255}
256
257/**
258 * rio_device_has_destid- Test if a device contains a destination ID register
259 * @port: Master port to issue transaction
260 * @src_ops: RIO device source operations
261 * @dst_ops: RIO device destination operations
262 *
263 * Checks the provided @src_ops and @dst_ops for the necessary transaction
264 * capabilities that indicate whether or not a device will implement a
265 * destination ID register. Returns 1 if true or 0 if false.
266 */
267static int rio_device_has_destid(struct rio_mport *port, int src_ops,
268 int dst_ops)
269{
270 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
271
272 return !!((src_ops | dst_ops) & mask);
273}
274
275/**
276 * rio_release_dev- Frees a RIO device struct
277 * @dev: LDM device associated with a RIO device struct
278 *
279 * Gets the RIO device struct associated a RIO device struct.
280 * The RIO device struct is freed.
281 */
282static void rio_release_dev(struct device *dev)
283{
284 struct rio_dev *rdev;
285
286 rdev = to_rio_dev(dev);
287 kfree(rdev);
288}
289
290/**
291 * rio_is_switch- Tests if a RIO device has switch capabilities
292 * @rdev: RIO device
293 *
294 * Gets the RIO device Processing Element Features register
295 * contents and tests for switch capabilities. Returns 1 if
296 * the device is a switch or 0 if it is not a switch.
297 * The RIO device struct is freed.
298 */
299static int rio_is_switch(struct rio_dev *rdev)
300{
301 if (rdev->pef & RIO_PEF_SWITCH)
302 return 1;
303 return 0;
304}
305
306/**
307 * rio_setup_device- Allocates and sets up a RIO device
308 * @net: RIO network
309 * @port: Master port to send transactions
310 * @destid: Current destination ID
311 * @hopcount: Current hopcount
312 * @do_enum: Enumeration/Discovery mode flag
313 *
314 * Allocates a RIO device and configures fields based on configuration
315 * space contents. If device has a destination ID register, a destination
316 * ID is either assigned in enumeration mode or read from configuration
317 * space in discovery mode. If the device has switch capabilities, then
318 * a switch is allocated and configured appropriately. Returns a pointer
319 * to a RIO device on success or NULL on failure.
320 *
321 */
322static struct rio_dev *rio_setup_device(struct rio_net *net,
323 struct rio_mport *port, u16 destid,
324 u8 hopcount, int do_enum)
325{
326 int ret = 0;
327 struct rio_dev *rdev;
328 struct rio_switch *rswitch = NULL;
329 int result, rdid;
330 size_t size;
331 u32 swpinfo = 0;
332
333 size = sizeof(struct rio_dev);
334 if (rio_mport_read_config_32(port, destid, hopcount,
335 RIO_PEF_CAR, &result))
336 return NULL;
337
338 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
339 rio_mport_read_config_32(port, destid, hopcount,
340 RIO_SWP_INFO_CAR, &swpinfo);
341 if (result & RIO_PEF_SWITCH) {
342 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
343 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
344 }
345 }
346
347 rdev = kzalloc(size, GFP_KERNEL);
348 if (!rdev)
349 return NULL;
350
351 rdev->net = net;
352 rdev->pef = result;
353 rdev->swpinfo = swpinfo;
354 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
355 &result);
356 rdev->did = result >> 16;
357 rdev->vid = result & 0xffff;
358 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
359 &rdev->device_rev);
360 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
361 &result);
362 rdev->asm_did = result >> 16;
363 rdev->asm_vid = result & 0xffff;
364 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
365 &result);
366 rdev->asm_rev = result >> 16;
367 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
368 rdev->efptr = result & 0xffff;
369 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
370 hopcount, &rdev->phys_rmap);
371 pr_debug("RIO: %s Register Map %d device\n",
372 __func__, rdev->phys_rmap);
373
374 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
375 hopcount, RIO_EFB_ERR_MGMNT);
376 if (!rdev->em_efptr)
377 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
378 hopcount, RIO_EFB_ERR_MGMNT_HS);
379 }
380
381 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
382 &rdev->src_ops);
383 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
384 &rdev->dst_ops);
385
386 if (do_enum) {
387 /* Assign component tag to device */
388 if (next_comptag >= 0x10000) {
389 pr_err("RIO: Component Tag Counter Overflow\n");
390 goto cleanup;
391 }
392 rio_mport_write_config_32(port, destid, hopcount,
393 RIO_COMPONENT_TAG_CSR, next_comptag);
394 rdev->comp_tag = next_comptag++;
395 rdev->do_enum = true;
396 } else {
397 rio_mport_read_config_32(port, destid, hopcount,
398 RIO_COMPONENT_TAG_CSR,
399 &rdev->comp_tag);
400 }
401
402 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
403 if (do_enum) {
404 rio_set_device_id(port, destid, hopcount, next_destid);
405 rdev->destid = next_destid;
406 next_destid = rio_destid_alloc(net);
407 } else
408 rdev->destid = rio_get_device_id(port, destid, hopcount);
409
410 rdev->hopcount = 0xff;
411 } else {
412 /* Switch device has an associated destID which
413 * will be adjusted later
414 */
415 rdev->destid = destid;
416 rdev->hopcount = hopcount;
417 }
418
419 /* If a PE has both switch and other functions, show it as a switch */
420 if (rio_is_switch(rdev)) {
421 rswitch = rdev->rswitch;
422 rswitch->port_ok = 0;
423 spin_lock_init(&rswitch->lock);
424 rswitch->route_table =
425 kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size),
426 GFP_KERNEL);
427 if (!rswitch->route_table)
428 goto cleanup;
429 /* Initialize switch route table */
430 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
431 rdid++)
432 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
433 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
434 rdev->comp_tag & RIO_CTAG_UDEVID);
435
436 if (do_enum)
437 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
438 } else {
439 if (do_enum)
440 /*Enable Input Output Port (transmitter receiver)*/
441 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
442
443 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
444 rdev->comp_tag & RIO_CTAG_UDEVID);
445 }
446
447 rdev->dev.parent = &net->dev;
448 rio_attach_device(rdev);
449 rdev->dev.release = rio_release_dev;
450 rdev->dma_mask = DMA_BIT_MASK(32);
451 rdev->dev.dma_mask = &rdev->dma_mask;
452 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
453
454 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
455 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
456 0, 0xffff);
457
458 ret = rio_add_device(rdev);
459 if (ret)
460 goto cleanup;
461
462 rio_dev_get(rdev);
463
464 return rdev;
465
466cleanup:
467 if (rswitch)
468 kfree(rswitch->route_table);
469
470 kfree(rdev);
471 return NULL;
472}
473
474/**
475 * rio_sport_is_active- Tests if a switch port has an active connection.
476 * @rdev: RapidIO device object
477 * @sp: Switch port number
478 *
479 * Reads the port error status CSR for a particular switch port to
480 * determine if the port has an active link. Returns
481 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
482 * inactive.
483 */
484static int
485rio_sport_is_active(struct rio_dev *rdev, int sp)
486{
487 u32 result = 0;
488
489 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
490 &result);
491
492 return result & RIO_PORT_N_ERR_STS_PORT_OK;
493}
494
495/**
496 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
497 * @port: Master port to send transaction
498 * @hopcount: Number of hops to the device
499 *
500 * Used during enumeration to read the Host Device ID Lock CSR on a
501 * RIO device. Returns the value of the lock register.
502 */
503static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
504{
505 u32 result;
506
507 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
508 RIO_HOST_DID_LOCK_CSR, &result);
509
510 return (u16) (result & 0xffff);
511}
512
513/**
514 * rio_enum_peer- Recursively enumerate a RIO network through a master port
515 * @net: RIO network being enumerated
516 * @port: Master port to send transactions
517 * @hopcount: Number of hops into the network
518 * @prev: Previous RIO device connected to the enumerated one
519 * @prev_port: Port on previous RIO device
520 *
521 * Recursively enumerates a RIO network. Transactions are sent via the
522 * master port passed in @port.
523 */
524static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
525 u8 hopcount, struct rio_dev *prev, int prev_port)
526{
527 struct rio_dev *rdev;
528 u32 regval;
529 int tmp;
530
531 if (rio_mport_chk_dev_access(port,
532 RIO_ANY_DESTID(port->sys_size), hopcount)) {
533 pr_debug("RIO: device access check failed\n");
534 return -1;
535 }
536
537 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
538 pr_debug("RIO: PE already discovered by this host\n");
539 /*
540 * Already discovered by this host. Add it as another
541 * link to the existing device.
542 */
543 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
544 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
545
546 if (regval) {
547 rdev = rio_get_comptag((regval & 0xffff), NULL);
548
549 if (rdev && prev && rio_is_switch(prev)) {
550 pr_debug("RIO: redundant path to %s\n",
551 rio_name(rdev));
552 prev->rswitch->nextdev[prev_port] = rdev;
553 }
554 }
555
556 return 0;
557 }
558
559 /* Attempt to acquire device lock */
560 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
561 hopcount,
562 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
563 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
564 < port->host_deviceid) {
565 /* Delay a bit */
566 mdelay(1);
567 /* Attempt to acquire device lock again */
568 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
569 hopcount,
570 RIO_HOST_DID_LOCK_CSR,
571 port->host_deviceid);
572 }
573
574 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
575 pr_debug(
576 "RIO: PE locked by a higher priority host...retreating\n");
577 return -1;
578 }
579
580 /* Setup new RIO device */
581 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
582 hopcount, 1);
583 if (rdev) {
584 rdev->prev = prev;
585 if (prev && rio_is_switch(prev))
586 prev->rswitch->nextdev[prev_port] = rdev;
587 } else
588 return -1;
589
590 if (rio_is_switch(rdev)) {
591 int sw_destid;
592 int cur_destid;
593 int sw_inport;
594 u16 destid;
595 int port_num;
596
597 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
598 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
599 port->host_deviceid, sw_inport, 0);
600 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
601
602 destid = rio_destid_first(net);
603 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
604 if (destid != port->host_deviceid) {
605 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
606 destid, sw_inport, 0);
607 rdev->rswitch->route_table[destid] = sw_inport;
608 }
609 destid = rio_destid_next(net, destid + 1);
610 }
611 pr_debug(
612 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
613 rio_name(rdev), rdev->vid, rdev->did,
614 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
615 sw_destid = next_destid;
616 for (port_num = 0;
617 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
618 port_num++) {
619 if (sw_inport == port_num) {
620 rio_enable_rx_tx_port(port, 0,
621 RIO_ANY_DESTID(port->sys_size),
622 hopcount, port_num);
623 rdev->rswitch->port_ok |= (1 << port_num);
624 continue;
625 }
626
627 cur_destid = next_destid;
628
629 if (rio_sport_is_active(rdev, port_num)) {
630 pr_debug(
631 "RIO: scanning device on port %d\n",
632 port_num);
633 rio_enable_rx_tx_port(port, 0,
634 RIO_ANY_DESTID(port->sys_size),
635 hopcount, port_num);
636 rdev->rswitch->port_ok |= (1 << port_num);
637 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
638 RIO_ANY_DESTID(port->sys_size),
639 port_num, 0);
640
641 if (rio_enum_peer(net, port, hopcount + 1,
642 rdev, port_num) < 0)
643 return -1;
644
645 /* Update routing tables */
646 destid = rio_destid_next(net, cur_destid + 1);
647 if (destid != RIO_INVALID_DESTID) {
648 for (destid = cur_destid;
649 destid < next_destid;) {
650 if (destid != port->host_deviceid) {
651 rio_route_add_entry(rdev,
652 RIO_GLOBAL_TABLE,
653 destid,
654 port_num,
655 0);
656 rdev->rswitch->
657 route_table[destid] =
658 port_num;
659 }
660 destid = rio_destid_next(net,
661 destid + 1);
662 }
663 }
664 } else {
665 /* If switch supports Error Management,
666 * set PORT_LOCKOUT bit for unused port
667 */
668 if (rdev->em_efptr)
669 rio_set_port_lockout(rdev, port_num, 1);
670
671 rdev->rswitch->port_ok &= ~(1 << port_num);
672 }
673 }
674
675 /* Direct Port-write messages to the enumeratiing host */
676 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
677 (rdev->em_efptr)) {
678 rio_write_config_32(rdev,
679 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
680 (port->host_deviceid << 16) |
681 (port->sys_size << 15));
682 }
683
684 rio_init_em(rdev);
685
686 /* Check for empty switch */
687 if (next_destid == sw_destid)
688 next_destid = rio_destid_alloc(net);
689
690 rdev->destid = sw_destid;
691 } else
692 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
693 rio_name(rdev), rdev->vid, rdev->did);
694
695 return 0;
696}
697
698/**
699 * rio_enum_complete- Tests if enumeration of a network is complete
700 * @port: Master port to send transaction
701 *
702 * Tests the PGCCSR discovered bit for non-zero value (enumeration
703 * complete flag). Return %1 if enumeration is complete or %0 if
704 * enumeration is incomplete.
705 */
706static int rio_enum_complete(struct rio_mport *port)
707{
708 u32 regval;
709
710 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
711 ®val);
712 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
713}
714
715/**
716 * rio_disc_peer- Recursively discovers a RIO network through a master port
717 * @net: RIO network being discovered
718 * @port: Master port to send transactions
719 * @destid: Current destination ID in network
720 * @hopcount: Number of hops into the network
721 * @prev: previous rio_dev
722 * @prev_port: previous port number
723 *
724 * Recursively discovers a RIO network. Transactions are sent via the
725 * master port passed in @port.
726 */
727static int
728rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
729 u8 hopcount, struct rio_dev *prev, int prev_port)
730{
731 u8 port_num, route_port;
732 struct rio_dev *rdev;
733 u16 ndestid;
734
735 /* Setup new RIO device */
736 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
737 rdev->prev = prev;
738 if (prev && rio_is_switch(prev))
739 prev->rswitch->nextdev[prev_port] = rdev;
740 } else
741 return -1;
742
743 if (rio_is_switch(rdev)) {
744 /* Associated destid is how we accessed this switch */
745 rdev->destid = destid;
746
747 pr_debug(
748 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
749 rio_name(rdev), rdev->vid, rdev->did,
750 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
751 for (port_num = 0;
752 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
753 port_num++) {
754 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
755 continue;
756
757 if (rio_sport_is_active(rdev, port_num)) {
758 pr_debug(
759 "RIO: scanning device on port %d\n",
760 port_num);
761
762 rio_lock_device(port, destid, hopcount, 1000);
763
764 for (ndestid = 0;
765 ndestid < RIO_ANY_DESTID(port->sys_size);
766 ndestid++) {
767 rio_route_get_entry(rdev,
768 RIO_GLOBAL_TABLE,
769 ndestid,
770 &route_port, 0);
771 if (route_port == port_num)
772 break;
773 }
774
775 if (ndestid == RIO_ANY_DESTID(port->sys_size))
776 continue;
777 rio_unlock_device(port, destid, hopcount);
778 if (rio_disc_peer(net, port, ndestid,
779 hopcount + 1, rdev, port_num) < 0)
780 return -1;
781 }
782 }
783 } else
784 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
785 rio_name(rdev), rdev->vid, rdev->did);
786
787 return 0;
788}
789
790/**
791 * rio_mport_is_active- Tests if master port link is active
792 * @port: Master port to test
793 *
794 * Reads the port error status CSR for the master port to
795 * determine if the port has an active link. Returns
796 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
797 * or %0 if it is inactive.
798 */
799static int rio_mport_is_active(struct rio_mport *port)
800{
801 u32 result = 0;
802
803 rio_local_read_config_32(port,
804 port->phys_efptr +
805 RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
806 &result);
807 return result & RIO_PORT_N_ERR_STS_PORT_OK;
808}
809
810static void rio_scan_release_net(struct rio_net *net)
811{
812 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
813 kfree(net->enum_data);
814}
815
816static void rio_scan_release_dev(struct device *dev)
817{
818 struct rio_net *net;
819
820 net = to_rio_net(dev);
821 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
822 kfree(net);
823}
824
825/*
826 * rio_scan_alloc_net - Allocate and configure a new RIO network
827 * @mport: Master port associated with the RIO network
828 * @do_enum: Enumeration/Discovery mode flag
829 * @start: logical minimal start id for new net
830 *
831 * Allocates a new RIO network structure and initializes enumerator-specific
832 * part of it (if required).
833 * Returns a RIO network pointer on success or %NULL on failure.
834 */
835static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
836 int do_enum, u16 start)
837{
838 struct rio_net *net;
839
840 net = rio_alloc_net(mport);
841
842 if (net && do_enum) {
843 struct rio_id_table *idtab;
844 size_t size;
845
846 size = sizeof(struct rio_id_table) +
847 BITS_TO_LONGS(
848 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
849 ) * sizeof(long);
850
851 idtab = kzalloc(size, GFP_KERNEL);
852
853 if (idtab == NULL) {
854 pr_err("RIO: failed to allocate destID table\n");
855 rio_free_net(net);
856 net = NULL;
857 } else {
858 net->enum_data = idtab;
859 net->release = rio_scan_release_net;
860 idtab->start = start;
861 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
862 spin_lock_init(&idtab->lock);
863 }
864 }
865
866 if (net) {
867 net->id = mport->id;
868 net->hport = mport;
869 dev_set_name(&net->dev, "rnet_%d", net->id);
870 net->dev.parent = &mport->dev;
871 net->dev.release = rio_scan_release_dev;
872 rio_add_net(net);
873 }
874
875 return net;
876}
877
878/**
879 * rio_update_route_tables- Updates route tables in switches
880 * @net: RIO network to run update on
881 *
882 * For each enumerated device, ensure that each switch in a system
883 * has correct routing entries. Add routes for devices that where
884 * unknown during the first enumeration pass through the switch.
885 */
886static void rio_update_route_tables(struct rio_net *net)
887{
888 struct rio_dev *rdev, *swrdev;
889 struct rio_switch *rswitch;
890 u8 sport;
891 u16 destid;
892
893 list_for_each_entry(rdev, &net->devices, net_list) {
894
895 destid = rdev->destid;
896
897 list_for_each_entry(rswitch, &net->switches, node) {
898
899 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
900 continue;
901
902 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
903 swrdev = sw_to_rio_dev(rswitch);
904
905 /* Skip if destid ends in empty switch*/
906 if (swrdev->destid == destid)
907 continue;
908
909 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
910
911 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
912 destid, sport, 0);
913 rswitch->route_table[destid] = sport;
914 }
915 }
916 }
917}
918
919/**
920 * rio_init_em - Initializes RIO Error Management (for switches)
921 * @rdev: RIO device
922 *
923 * For each enumerated switch, call device-specific error management
924 * initialization routine (if supplied by the switch driver).
925 */
926static void rio_init_em(struct rio_dev *rdev)
927{
928 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
929 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
930 rdev->rswitch->ops->em_init(rdev);
931 }
932}
933
934/**
935 * rio_enum_mport- Start enumeration through a master port
936 * @mport: Master port to send transactions
937 * @flags: Enumeration control flags
938 *
939 * Starts the enumeration process. If somebody has enumerated our
940 * master port device, then give up. If not and we have an active
941 * link, then start recursive peer enumeration. Returns %0 if
942 * enumeration succeeds or %-EBUSY if enumeration fails.
943 */
944static int rio_enum_mport(struct rio_mport *mport, u32 flags)
945{
946 struct rio_net *net = NULL;
947 int rc = 0;
948
949 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
950 mport->name);
951
952 /*
953 * To avoid multiple start requests (repeat enumeration is not supported
954 * by this method) check if enumeration/discovery was performed for this
955 * mport: if mport was added into the list of mports for a net exit
956 * with error.
957 */
958 if (mport->nnode.next || mport->nnode.prev)
959 return -EBUSY;
960
961 /* If somebody else enumerated our master port device, bail. */
962 if (rio_enum_host(mport) < 0) {
963 printk(KERN_INFO
964 "RIO: master port %d device has been enumerated by a remote host\n",
965 mport->id);
966 rc = -EBUSY;
967 goto out;
968 }
969
970 /* If master port has an active link, allocate net and enum peers */
971 if (rio_mport_is_active(mport)) {
972 net = rio_scan_alloc_net(mport, 1, 0);
973 if (!net) {
974 printk(KERN_ERR "RIO: failed to allocate new net\n");
975 rc = -ENOMEM;
976 goto out;
977 }
978
979 /* reserve mport destID in new net */
980 rio_destid_reserve(net, mport->host_deviceid);
981
982 /* Enable Input Output Port (transmitter receiver) */
983 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
984
985 /* Set component tag for host */
986 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
987 next_comptag++);
988
989 next_destid = rio_destid_alloc(net);
990
991 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
992 /* A higher priority host won enumeration, bail. */
993 printk(KERN_INFO
994 "RIO: master port %d device has lost enumeration to a remote host\n",
995 mport->id);
996 rio_clear_locks(net);
997 rc = -EBUSY;
998 goto out;
999 }
1000 /* free the last allocated destID (unused) */
1001 rio_destid_free(net, next_destid);
1002 rio_update_route_tables(net);
1003 rio_clear_locks(net);
1004 rio_pw_enable(mport, 1);
1005 } else {
1006 printk(KERN_INFO "RIO: master port %d link inactive\n",
1007 mport->id);
1008 rc = -EINVAL;
1009 }
1010
1011 out:
1012 return rc;
1013}
1014
1015/**
1016 * rio_build_route_tables- Generate route tables from switch route entries
1017 * @net: RIO network to run route tables scan on
1018 *
1019 * For each switch device, generate a route table by copying existing
1020 * route entries from the switch.
1021 */
1022static void rio_build_route_tables(struct rio_net *net)
1023{
1024 struct rio_switch *rswitch;
1025 struct rio_dev *rdev;
1026 int i;
1027 u8 sport;
1028
1029 list_for_each_entry(rswitch, &net->switches, node) {
1030 rdev = sw_to_rio_dev(rswitch);
1031
1032 rio_lock_device(net->hport, rdev->destid,
1033 rdev->hopcount, 1000);
1034 for (i = 0;
1035 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1036 i++) {
1037 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1038 i, &sport, 0) < 0)
1039 continue;
1040 rswitch->route_table[i] = sport;
1041 }
1042
1043 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1044 }
1045}
1046
1047/**
1048 * rio_disc_mport- Start discovery through a master port
1049 * @mport: Master port to send transactions
1050 * @flags: discovery control flags
1051 *
1052 * Starts the discovery process. If we have an active link,
1053 * then wait for the signal that enumeration is complete (if wait
1054 * is allowed).
1055 * When enumeration completion is signaled, start recursive
1056 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1057 * on failure.
1058 */
1059static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1060{
1061 struct rio_net *net = NULL;
1062 unsigned long to_end;
1063
1064 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1065 mport->name);
1066
1067 /* If master port has an active link, allocate net and discover peers */
1068 if (rio_mport_is_active(mport)) {
1069 if (rio_enum_complete(mport))
1070 goto enum_done;
1071 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1072 return -EAGAIN;
1073
1074 pr_debug("RIO: wait for enumeration to complete...\n");
1075
1076 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1077 while (time_before(jiffies, to_end)) {
1078 if (rio_enum_complete(mport))
1079 goto enum_done;
1080 msleep(10);
1081 }
1082
1083 pr_debug("RIO: discovery timeout on mport %d %s\n",
1084 mport->id, mport->name);
1085 goto bail;
1086enum_done:
1087 pr_debug("RIO: ... enumeration done\n");
1088
1089 net = rio_scan_alloc_net(mport, 0, 0);
1090 if (!net) {
1091 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1092 goto bail;
1093 }
1094
1095 /* Read DestID assigned by enumerator */
1096 rio_local_read_config_32(mport, RIO_DID_CSR,
1097 &mport->host_deviceid);
1098 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1099 mport->host_deviceid);
1100
1101 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1102 0, NULL, 0) < 0) {
1103 printk(KERN_INFO
1104 "RIO: master port %d device has failed discovery\n",
1105 mport->id);
1106 goto bail;
1107 }
1108
1109 rio_build_route_tables(net);
1110 }
1111
1112 return 0;
1113bail:
1114 return -EBUSY;
1115}
1116
1117static struct rio_scan rio_scan_ops = {
1118 .owner = THIS_MODULE,
1119 .enumerate = rio_enum_mport,
1120 .discover = rio_disc_mport,
1121};
1122
1123static bool scan;
1124module_param(scan, bool, 0);
1125MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1126 "(default = 0)");
1127
1128/**
1129 * rio_basic_attach:
1130 *
1131 * When this enumeration/discovery method is loaded as a module this function
1132 * registers its specific enumeration and discover routines for all available
1133 * RapidIO mport devices. The "scan" command line parameter controls ability of
1134 * the module to start RapidIO enumeration/discovery automatically.
1135 *
1136 * Returns 0 for success or -EIO if unable to register itself.
1137 *
1138 * This enumeration/discovery method cannot be unloaded and therefore does not
1139 * provide a matching cleanup_module routine.
1140 */
1141
1142static int __init rio_basic_attach(void)
1143{
1144 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1145 return -EIO;
1146 if (scan)
1147 rio_init_mports();
1148 return 0;
1149}
1150
1151late_initcall(rio_basic_attach);
1152
1153MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1154MODULE_LICENSE("GPL");