Loading...
1/*
2 * CompactPCI Hot Plug Driver
3 *
4 * Copyright (C) 2002,2005 SOMA Networks, Inc.
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * Send feedback to <scottm@somanetworks.com>
26 */
27
28#include <linux/module.h>
29#include <linux/kernel.h>
30#include <linux/slab.h>
31#include <linux/pci.h>
32#include <linux/pci_hotplug.h>
33#include <linux/init.h>
34#include <linux/interrupt.h>
35#include <linux/atomic.h>
36#include <linux/delay.h>
37#include <linux/kthread.h>
38#include "cpci_hotplug.h"
39
40#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
41#define DRIVER_DESC "CompactPCI Hot Plug Core"
42
43#define MY_NAME "cpci_hotplug"
44
45#define dbg(format, arg...) \
46 do { \
47 if (cpci_debug) \
48 printk (KERN_DEBUG "%s: " format "\n", \
49 MY_NAME , ## arg); \
50 } while (0)
51#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
52#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
53#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
54
55/* local variables */
56static DECLARE_RWSEM(list_rwsem);
57static LIST_HEAD(slot_list);
58static int slots;
59static atomic_t extracting;
60int cpci_debug;
61static struct cpci_hp_controller *controller;
62static struct task_struct *cpci_thread;
63static int thread_finished;
64
65static int enable_slot(struct hotplug_slot *slot);
66static int disable_slot(struct hotplug_slot *slot);
67static int set_attention_status(struct hotplug_slot *slot, u8 value);
68static int get_power_status(struct hotplug_slot *slot, u8 * value);
69static int get_attention_status(struct hotplug_slot *slot, u8 * value);
70static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
71static int get_latch_status(struct hotplug_slot *slot, u8 * value);
72
73static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
74 .enable_slot = enable_slot,
75 .disable_slot = disable_slot,
76 .set_attention_status = set_attention_status,
77 .get_power_status = get_power_status,
78 .get_attention_status = get_attention_status,
79 .get_adapter_status = get_adapter_status,
80 .get_latch_status = get_latch_status,
81};
82
83static int
84update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
85{
86 struct hotplug_slot_info info;
87
88 memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
89 info.latch_status = value;
90 return pci_hp_change_slot_info(hotplug_slot, &info);
91}
92
93static int
94update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
95{
96 struct hotplug_slot_info info;
97
98 memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
99 info.adapter_status = value;
100 return pci_hp_change_slot_info(hotplug_slot, &info);
101}
102
103static int
104enable_slot(struct hotplug_slot *hotplug_slot)
105{
106 struct slot *slot = hotplug_slot->private;
107 int retval = 0;
108
109 dbg("%s - physical_slot = %s", __func__, slot_name(slot));
110
111 if (controller->ops->set_power)
112 retval = controller->ops->set_power(slot, 1);
113 return retval;
114}
115
116static int
117disable_slot(struct hotplug_slot *hotplug_slot)
118{
119 struct slot *slot = hotplug_slot->private;
120 int retval = 0;
121
122 dbg("%s - physical_slot = %s", __func__, slot_name(slot));
123
124 down_write(&list_rwsem);
125
126 /* Unconfigure device */
127 dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));
128 if ((retval = cpci_unconfigure_slot(slot))) {
129 err("%s - could not unconfigure slot %s",
130 __func__, slot_name(slot));
131 goto disable_error;
132 }
133 dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot));
134
135 /* Clear EXT (by setting it) */
136 if (cpci_clear_ext(slot)) {
137 err("%s - could not clear EXT for slot %s",
138 __func__, slot_name(slot));
139 retval = -ENODEV;
140 goto disable_error;
141 }
142 cpci_led_on(slot);
143
144 if (controller->ops->set_power)
145 if ((retval = controller->ops->set_power(slot, 0)))
146 goto disable_error;
147
148 if (update_adapter_status(slot->hotplug_slot, 0))
149 warn("failure to update adapter file");
150
151 if (slot->extracting) {
152 slot->extracting = 0;
153 atomic_dec(&extracting);
154 }
155disable_error:
156 up_write(&list_rwsem);
157 return retval;
158}
159
160static u8
161cpci_get_power_status(struct slot *slot)
162{
163 u8 power = 1;
164
165 if (controller->ops->get_power)
166 power = controller->ops->get_power(slot);
167 return power;
168}
169
170static int
171get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
172{
173 struct slot *slot = hotplug_slot->private;
174
175 *value = cpci_get_power_status(slot);
176 return 0;
177}
178
179static int
180get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
181{
182 struct slot *slot = hotplug_slot->private;
183
184 *value = cpci_get_attention_status(slot);
185 return 0;
186}
187
188static int
189set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
190{
191 return cpci_set_attention_status(hotplug_slot->private, status);
192}
193
194static int
195get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
196{
197 *value = hotplug_slot->info->adapter_status;
198 return 0;
199}
200
201static int
202get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value)
203{
204 *value = hotplug_slot->info->latch_status;
205 return 0;
206}
207
208static void release_slot(struct hotplug_slot *hotplug_slot)
209{
210 struct slot *slot = hotplug_slot->private;
211
212 kfree(slot->hotplug_slot->info);
213 kfree(slot->hotplug_slot);
214 if (slot->dev)
215 pci_dev_put(slot->dev);
216 kfree(slot);
217}
218
219#define SLOT_NAME_SIZE 6
220
221int
222cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
223{
224 struct slot *slot;
225 struct hotplug_slot *hotplug_slot;
226 struct hotplug_slot_info *info;
227 char name[SLOT_NAME_SIZE];
228 int status = -ENOMEM;
229 int i;
230
231 if (!(controller && bus))
232 return -ENODEV;
233
234 /*
235 * Create a structure for each slot, and register that slot
236 * with the pci_hotplug subsystem.
237 */
238 for (i = first; i <= last; ++i) {
239 slot = kzalloc(sizeof (struct slot), GFP_KERNEL);
240 if (!slot)
241 goto error;
242
243 hotplug_slot =
244 kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
245 if (!hotplug_slot)
246 goto error_slot;
247 slot->hotplug_slot = hotplug_slot;
248
249 info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
250 if (!info)
251 goto error_hpslot;
252 hotplug_slot->info = info;
253
254 slot->bus = bus;
255 slot->number = i;
256 slot->devfn = PCI_DEVFN(i, 0);
257
258 snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i);
259
260 hotplug_slot->private = slot;
261 hotplug_slot->release = &release_slot;
262 hotplug_slot->ops = &cpci_hotplug_slot_ops;
263
264 /*
265 * Initialize the slot info structure with some known
266 * good values.
267 */
268 dbg("initializing slot %s", name);
269 info->power_status = cpci_get_power_status(slot);
270 info->attention_status = cpci_get_attention_status(slot);
271
272 dbg("registering slot %s", name);
273 status = pci_hp_register(slot->hotplug_slot, bus, i, name);
274 if (status) {
275 err("pci_hp_register failed with error %d", status);
276 goto error_info;
277 }
278 dbg("slot registered with name: %s", slot_name(slot));
279
280 /* Add slot to our internal list */
281 down_write(&list_rwsem);
282 list_add(&slot->slot_list, &slot_list);
283 slots++;
284 up_write(&list_rwsem);
285 }
286 return 0;
287error_info:
288 kfree(info);
289error_hpslot:
290 kfree(hotplug_slot);
291error_slot:
292 kfree(slot);
293error:
294 return status;
295}
296
297int
298cpci_hp_unregister_bus(struct pci_bus *bus)
299{
300 struct slot *slot;
301 struct slot *tmp;
302 int status = 0;
303
304 down_write(&list_rwsem);
305 if (!slots) {
306 up_write(&list_rwsem);
307 return -1;
308 }
309 list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
310 if (slot->bus == bus) {
311 list_del(&slot->slot_list);
312 slots--;
313
314 dbg("deregistering slot %s", slot_name(slot));
315 status = pci_hp_deregister(slot->hotplug_slot);
316 if (status) {
317 err("pci_hp_deregister failed with error %d",
318 status);
319 break;
320 }
321 }
322 }
323 up_write(&list_rwsem);
324 return status;
325}
326
327/* This is the interrupt mode interrupt handler */
328static irqreturn_t
329cpci_hp_intr(int irq, void *data)
330{
331 dbg("entered cpci_hp_intr");
332
333 /* Check to see if it was our interrupt */
334 if ((controller->irq_flags & IRQF_SHARED) &&
335 !controller->ops->check_irq(controller->dev_id)) {
336 dbg("exited cpci_hp_intr, not our interrupt");
337 return IRQ_NONE;
338 }
339
340 /* Disable ENUM interrupt */
341 controller->ops->disable_irq();
342
343 /* Trigger processing by the event thread */
344 wake_up_process(cpci_thread);
345 return IRQ_HANDLED;
346}
347
348/*
349 * According to PICMG 2.1 R2.0, section 6.3.2, upon
350 * initialization, the system driver shall clear the
351 * INS bits of the cold-inserted devices.
352 */
353static int
354init_slots(int clear_ins)
355{
356 struct slot *slot;
357 struct pci_dev* dev;
358
359 dbg("%s - enter", __func__);
360 down_read(&list_rwsem);
361 if (!slots) {
362 up_read(&list_rwsem);
363 return -1;
364 }
365 list_for_each_entry(slot, &slot_list, slot_list) {
366 dbg("%s - looking at slot %s", __func__, slot_name(slot));
367 if (clear_ins && cpci_check_and_clear_ins(slot))
368 dbg("%s - cleared INS for slot %s",
369 __func__, slot_name(slot));
370 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
371 if (dev) {
372 if (update_adapter_status(slot->hotplug_slot, 1))
373 warn("failure to update adapter file");
374 if (update_latch_status(slot->hotplug_slot, 1))
375 warn("failure to update latch file");
376 slot->dev = dev;
377 }
378 }
379 up_read(&list_rwsem);
380 dbg("%s - exit", __func__);
381 return 0;
382}
383
384static int
385check_slots(void)
386{
387 struct slot *slot;
388 int extracted;
389 int inserted;
390 u16 hs_csr;
391
392 down_read(&list_rwsem);
393 if (!slots) {
394 up_read(&list_rwsem);
395 err("no slots registered, shutting down");
396 return -1;
397 }
398 extracted = inserted = 0;
399 list_for_each_entry(slot, &slot_list, slot_list) {
400 dbg("%s - looking at slot %s", __func__, slot_name(slot));
401 if (cpci_check_and_clear_ins(slot)) {
402 /*
403 * Some broken hardware (e.g. PLX 9054AB) asserts
404 * ENUM# twice...
405 */
406 if (slot->dev) {
407 warn("slot %s already inserted",
408 slot_name(slot));
409 inserted++;
410 continue;
411 }
412
413 /* Process insertion */
414 dbg("%s - slot %s inserted", __func__, slot_name(slot));
415
416 /* GSM, debug */
417 hs_csr = cpci_get_hs_csr(slot);
418 dbg("%s - slot %s HS_CSR (1) = %04x",
419 __func__, slot_name(slot), hs_csr);
420
421 /* Configure device */
422 dbg("%s - configuring slot %s",
423 __func__, slot_name(slot));
424 if (cpci_configure_slot(slot)) {
425 err("%s - could not configure slot %s",
426 __func__, slot_name(slot));
427 continue;
428 }
429 dbg("%s - finished configuring slot %s",
430 __func__, slot_name(slot));
431
432 /* GSM, debug */
433 hs_csr = cpci_get_hs_csr(slot);
434 dbg("%s - slot %s HS_CSR (2) = %04x",
435 __func__, slot_name(slot), hs_csr);
436
437 if (update_latch_status(slot->hotplug_slot, 1))
438 warn("failure to update latch file");
439
440 if (update_adapter_status(slot->hotplug_slot, 1))
441 warn("failure to update adapter file");
442
443 cpci_led_off(slot);
444
445 /* GSM, debug */
446 hs_csr = cpci_get_hs_csr(slot);
447 dbg("%s - slot %s HS_CSR (3) = %04x",
448 __func__, slot_name(slot), hs_csr);
449
450 inserted++;
451 } else if (cpci_check_ext(slot)) {
452 /* Process extraction request */
453 dbg("%s - slot %s extracted",
454 __func__, slot_name(slot));
455
456 /* GSM, debug */
457 hs_csr = cpci_get_hs_csr(slot);
458 dbg("%s - slot %s HS_CSR = %04x",
459 __func__, slot_name(slot), hs_csr);
460
461 if (!slot->extracting) {
462 if (update_latch_status(slot->hotplug_slot, 0)) {
463 warn("failure to update latch file");
464 }
465 slot->extracting = 1;
466 atomic_inc(&extracting);
467 }
468 extracted++;
469 } else if (slot->extracting) {
470 hs_csr = cpci_get_hs_csr(slot);
471 if (hs_csr == 0xffff) {
472 /*
473 * Hmmm, we're likely hosed at this point, should we
474 * bother trying to tell the driver or not?
475 */
476 err("card in slot %s was improperly removed",
477 slot_name(slot));
478 if (update_adapter_status(slot->hotplug_slot, 0))
479 warn("failure to update adapter file");
480 slot->extracting = 0;
481 atomic_dec(&extracting);
482 }
483 }
484 }
485 up_read(&list_rwsem);
486 dbg("inserted=%d, extracted=%d, extracting=%d",
487 inserted, extracted, atomic_read(&extracting));
488 if (inserted || extracted)
489 return extracted;
490 else if (!atomic_read(&extracting)) {
491 err("cannot find ENUM# source, shutting down");
492 return -1;
493 }
494 return 0;
495}
496
497/* This is the interrupt mode worker thread body */
498static int
499event_thread(void *data)
500{
501 int rc;
502
503 dbg("%s - event thread started", __func__);
504 while (1) {
505 dbg("event thread sleeping");
506 set_current_state(TASK_INTERRUPTIBLE);
507 schedule();
508 if (kthread_should_stop())
509 break;
510 do {
511 rc = check_slots();
512 if (rc > 0) {
513 /* Give userspace a chance to handle extraction */
514 msleep(500);
515 } else if (rc < 0) {
516 dbg("%s - error checking slots", __func__);
517 thread_finished = 1;
518 goto out;
519 }
520 } while (atomic_read(&extracting) && !kthread_should_stop());
521 if (kthread_should_stop())
522 break;
523
524 /* Re-enable ENUM# interrupt */
525 dbg("%s - re-enabling irq", __func__);
526 controller->ops->enable_irq();
527 }
528 out:
529 return 0;
530}
531
532/* This is the polling mode worker thread body */
533static int
534poll_thread(void *data)
535{
536 int rc;
537
538 while (1) {
539 if (kthread_should_stop() || signal_pending(current))
540 break;
541 if (controller->ops->query_enum()) {
542 do {
543 rc = check_slots();
544 if (rc > 0) {
545 /* Give userspace a chance to handle extraction */
546 msleep(500);
547 } else if (rc < 0) {
548 dbg("%s - error checking slots", __func__);
549 thread_finished = 1;
550 goto out;
551 }
552 } while (atomic_read(&extracting) && !kthread_should_stop());
553 }
554 msleep(100);
555 }
556 out:
557 return 0;
558}
559
560static int
561cpci_start_thread(void)
562{
563 if (controller->irq)
564 cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
565 else
566 cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
567 if (IS_ERR(cpci_thread)) {
568 err("Can't start up our thread");
569 return PTR_ERR(cpci_thread);
570 }
571 thread_finished = 0;
572 return 0;
573}
574
575static void
576cpci_stop_thread(void)
577{
578 kthread_stop(cpci_thread);
579 thread_finished = 1;
580}
581
582int
583cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
584{
585 int status = 0;
586
587 if (controller)
588 return -1;
589 if (!(new_controller && new_controller->ops))
590 return -EINVAL;
591 if (new_controller->irq) {
592 if (!(new_controller->ops->enable_irq &&
593 new_controller->ops->disable_irq))
594 status = -EINVAL;
595 if (request_irq(new_controller->irq,
596 cpci_hp_intr,
597 new_controller->irq_flags,
598 MY_NAME,
599 new_controller->dev_id)) {
600 err("Can't get irq %d for the hotplug cPCI controller",
601 new_controller->irq);
602 status = -ENODEV;
603 }
604 dbg("%s - acquired controller irq %d",
605 __func__, new_controller->irq);
606 }
607 if (!status)
608 controller = new_controller;
609 return status;
610}
611
612static void
613cleanup_slots(void)
614{
615 struct slot *slot;
616 struct slot *tmp;
617
618 /*
619 * Unregister all of our slots with the pci_hotplug subsystem,
620 * and free up all memory that we had allocated.
621 */
622 down_write(&list_rwsem);
623 if (!slots)
624 goto cleanup_null;
625 list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
626 list_del(&slot->slot_list);
627 pci_hp_deregister(slot->hotplug_slot);
628 }
629cleanup_null:
630 up_write(&list_rwsem);
631 return;
632}
633
634int
635cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
636{
637 int status = 0;
638
639 if (controller) {
640 if (!thread_finished)
641 cpci_stop_thread();
642 if (controller->irq)
643 free_irq(controller->irq, controller->dev_id);
644 controller = NULL;
645 cleanup_slots();
646 } else
647 status = -ENODEV;
648 return status;
649}
650
651int
652cpci_hp_start(void)
653{
654 static int first = 1;
655 int status;
656
657 dbg("%s - enter", __func__);
658 if (!controller)
659 return -ENODEV;
660
661 down_read(&list_rwsem);
662 if (list_empty(&slot_list)) {
663 up_read(&list_rwsem);
664 return -ENODEV;
665 }
666 up_read(&list_rwsem);
667
668 status = init_slots(first);
669 if (first)
670 first = 0;
671 if (status)
672 return status;
673
674 status = cpci_start_thread();
675 if (status)
676 return status;
677 dbg("%s - thread started", __func__);
678
679 if (controller->irq) {
680 /* Start enum interrupt processing */
681 dbg("%s - enabling irq", __func__);
682 controller->ops->enable_irq();
683 }
684 dbg("%s - exit", __func__);
685 return 0;
686}
687
688int
689cpci_hp_stop(void)
690{
691 if (!controller)
692 return -ENODEV;
693 if (controller->irq) {
694 /* Stop enum interrupt processing */
695 dbg("%s - disabling irq", __func__);
696 controller->ops->disable_irq();
697 }
698 cpci_stop_thread();
699 return 0;
700}
701
702int __init
703cpci_hotplug_init(int debug)
704{
705 cpci_debug = debug;
706 return 0;
707}
708
709void __exit
710cpci_hotplug_exit(void)
711{
712 /*
713 * Clean everything up.
714 */
715 cpci_hp_stop();
716 cpci_hp_unregister_controller(controller);
717}
718
719EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
720EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
721EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
722EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
723EXPORT_SYMBOL_GPL(cpci_hp_start);
724EXPORT_SYMBOL_GPL(cpci_hp_stop);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * CompactPCI Hot Plug Driver
4 *
5 * Copyright (C) 2002,2005 SOMA Networks, Inc.
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 *
9 * All rights reserved.
10 *
11 * Send feedback to <scottm@somanetworks.com>
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/sched/signal.h>
17#include <linux/slab.h>
18#include <linux/pci.h>
19#include <linux/pci_hotplug.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/atomic.h>
23#include <linux/delay.h>
24#include <linux/kthread.h>
25#include "cpci_hotplug.h"
26
27#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
28#define DRIVER_DESC "CompactPCI Hot Plug Core"
29
30#define MY_NAME "cpci_hotplug"
31
32#define dbg(format, arg...) \
33 do { \
34 if (cpci_debug) \
35 printk(KERN_DEBUG "%s: " format "\n", \
36 MY_NAME, ## arg); \
37 } while (0)
38#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
39#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
40#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)
41
42/* local variables */
43static DECLARE_RWSEM(list_rwsem);
44static LIST_HEAD(slot_list);
45static int slots;
46static atomic_t extracting;
47int cpci_debug;
48static struct cpci_hp_controller *controller;
49static struct task_struct *cpci_thread;
50static int thread_finished;
51
52static int enable_slot(struct hotplug_slot *slot);
53static int disable_slot(struct hotplug_slot *slot);
54static int set_attention_status(struct hotplug_slot *slot, u8 value);
55static int get_power_status(struct hotplug_slot *slot, u8 *value);
56static int get_attention_status(struct hotplug_slot *slot, u8 *value);
57static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
58static int get_latch_status(struct hotplug_slot *slot, u8 *value);
59
60static const struct hotplug_slot_ops cpci_hotplug_slot_ops = {
61 .enable_slot = enable_slot,
62 .disable_slot = disable_slot,
63 .set_attention_status = set_attention_status,
64 .get_power_status = get_power_status,
65 .get_attention_status = get_attention_status,
66 .get_adapter_status = get_adapter_status,
67 .get_latch_status = get_latch_status,
68};
69
70static int
71enable_slot(struct hotplug_slot *hotplug_slot)
72{
73 struct slot *slot = to_slot(hotplug_slot);
74 int retval = 0;
75
76 dbg("%s - physical_slot = %s", __func__, slot_name(slot));
77
78 if (controller->ops->set_power)
79 retval = controller->ops->set_power(slot, 1);
80 return retval;
81}
82
83static int
84disable_slot(struct hotplug_slot *hotplug_slot)
85{
86 struct slot *slot = to_slot(hotplug_slot);
87 int retval = 0;
88
89 dbg("%s - physical_slot = %s", __func__, slot_name(slot));
90
91 down_write(&list_rwsem);
92
93 /* Unconfigure device */
94 dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));
95 retval = cpci_unconfigure_slot(slot);
96 if (retval) {
97 err("%s - could not unconfigure slot %s",
98 __func__, slot_name(slot));
99 goto disable_error;
100 }
101 dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot));
102
103 /* Clear EXT (by setting it) */
104 if (cpci_clear_ext(slot)) {
105 err("%s - could not clear EXT for slot %s",
106 __func__, slot_name(slot));
107 retval = -ENODEV;
108 goto disable_error;
109 }
110 cpci_led_on(slot);
111
112 if (controller->ops->set_power) {
113 retval = controller->ops->set_power(slot, 0);
114 if (retval)
115 goto disable_error;
116 }
117
118 slot->adapter_status = 0;
119
120 if (slot->extracting) {
121 slot->extracting = 0;
122 atomic_dec(&extracting);
123 }
124disable_error:
125 up_write(&list_rwsem);
126 return retval;
127}
128
129static u8
130cpci_get_power_status(struct slot *slot)
131{
132 u8 power = 1;
133
134 if (controller->ops->get_power)
135 power = controller->ops->get_power(slot);
136 return power;
137}
138
139static int
140get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
141{
142 struct slot *slot = to_slot(hotplug_slot);
143
144 *value = cpci_get_power_status(slot);
145 return 0;
146}
147
148static int
149get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
150{
151 struct slot *slot = to_slot(hotplug_slot);
152
153 *value = cpci_get_attention_status(slot);
154 return 0;
155}
156
157static int
158set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
159{
160 return cpci_set_attention_status(to_slot(hotplug_slot), status);
161}
162
163static int
164get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
165{
166 struct slot *slot = to_slot(hotplug_slot);
167
168 *value = slot->adapter_status;
169 return 0;
170}
171
172static int
173get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
174{
175 struct slot *slot = to_slot(hotplug_slot);
176
177 *value = slot->latch_status;
178 return 0;
179}
180
181static void release_slot(struct slot *slot)
182{
183 pci_dev_put(slot->dev);
184 kfree(slot);
185}
186
187#define SLOT_NAME_SIZE 6
188
189int
190cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
191{
192 struct slot *slot;
193 char name[SLOT_NAME_SIZE];
194 int status;
195 int i;
196
197 if (!(controller && bus))
198 return -ENODEV;
199
200 /*
201 * Create a structure for each slot, and register that slot
202 * with the pci_hotplug subsystem.
203 */
204 for (i = first; i <= last; ++i) {
205 slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
206 if (!slot) {
207 status = -ENOMEM;
208 goto error;
209 }
210
211 slot->bus = bus;
212 slot->number = i;
213 slot->devfn = PCI_DEVFN(i, 0);
214
215 snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i);
216
217 slot->hotplug_slot.ops = &cpci_hotplug_slot_ops;
218
219 dbg("registering slot %s", name);
220 status = pci_hp_register(&slot->hotplug_slot, bus, i, name);
221 if (status) {
222 err("pci_hp_register failed with error %d", status);
223 goto error_slot;
224 }
225 dbg("slot registered with name: %s", slot_name(slot));
226
227 /* Add slot to our internal list */
228 down_write(&list_rwsem);
229 list_add(&slot->slot_list, &slot_list);
230 slots++;
231 up_write(&list_rwsem);
232 }
233 return 0;
234error_slot:
235 kfree(slot);
236error:
237 return status;
238}
239EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
240
241int
242cpci_hp_unregister_bus(struct pci_bus *bus)
243{
244 struct slot *slot;
245 struct slot *tmp;
246 int status = 0;
247
248 down_write(&list_rwsem);
249 if (!slots) {
250 up_write(&list_rwsem);
251 return -1;
252 }
253 list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
254 if (slot->bus == bus) {
255 list_del(&slot->slot_list);
256 slots--;
257
258 dbg("deregistering slot %s", slot_name(slot));
259 pci_hp_deregister(&slot->hotplug_slot);
260 release_slot(slot);
261 }
262 }
263 up_write(&list_rwsem);
264 return status;
265}
266EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
267
268/* This is the interrupt mode interrupt handler */
269static irqreturn_t
270cpci_hp_intr(int irq, void *data)
271{
272 dbg("entered cpci_hp_intr");
273
274 /* Check to see if it was our interrupt */
275 if ((controller->irq_flags & IRQF_SHARED) &&
276 !controller->ops->check_irq(controller->dev_id)) {
277 dbg("exited cpci_hp_intr, not our interrupt");
278 return IRQ_NONE;
279 }
280
281 /* Disable ENUM interrupt */
282 controller->ops->disable_irq();
283
284 /* Trigger processing by the event thread */
285 wake_up_process(cpci_thread);
286 return IRQ_HANDLED;
287}
288
289/*
290 * According to PICMG 2.1 R2.0, section 6.3.2, upon
291 * initialization, the system driver shall clear the
292 * INS bits of the cold-inserted devices.
293 */
294static int
295init_slots(int clear_ins)
296{
297 struct slot *slot;
298 struct pci_dev *dev;
299
300 dbg("%s - enter", __func__);
301 down_read(&list_rwsem);
302 if (!slots) {
303 up_read(&list_rwsem);
304 return -1;
305 }
306 list_for_each_entry(slot, &slot_list, slot_list) {
307 dbg("%s - looking at slot %s", __func__, slot_name(slot));
308 if (clear_ins && cpci_check_and_clear_ins(slot))
309 dbg("%s - cleared INS for slot %s",
310 __func__, slot_name(slot));
311 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
312 if (dev) {
313 slot->adapter_status = 1;
314 slot->latch_status = 1;
315 slot->dev = dev;
316 }
317 }
318 up_read(&list_rwsem);
319 dbg("%s - exit", __func__);
320 return 0;
321}
322
323static int
324check_slots(void)
325{
326 struct slot *slot;
327 int extracted;
328 int inserted;
329 u16 hs_csr;
330
331 down_read(&list_rwsem);
332 if (!slots) {
333 up_read(&list_rwsem);
334 err("no slots registered, shutting down");
335 return -1;
336 }
337 extracted = inserted = 0;
338 list_for_each_entry(slot, &slot_list, slot_list) {
339 dbg("%s - looking at slot %s", __func__, slot_name(slot));
340 if (cpci_check_and_clear_ins(slot)) {
341 /*
342 * Some broken hardware (e.g. PLX 9054AB) asserts
343 * ENUM# twice...
344 */
345 if (slot->dev) {
346 warn("slot %s already inserted",
347 slot_name(slot));
348 inserted++;
349 continue;
350 }
351
352 /* Process insertion */
353 dbg("%s - slot %s inserted", __func__, slot_name(slot));
354
355 /* GSM, debug */
356 hs_csr = cpci_get_hs_csr(slot);
357 dbg("%s - slot %s HS_CSR (1) = %04x",
358 __func__, slot_name(slot), hs_csr);
359
360 /* Configure device */
361 dbg("%s - configuring slot %s",
362 __func__, slot_name(slot));
363 if (cpci_configure_slot(slot)) {
364 err("%s - could not configure slot %s",
365 __func__, slot_name(slot));
366 continue;
367 }
368 dbg("%s - finished configuring slot %s",
369 __func__, slot_name(slot));
370
371 /* GSM, debug */
372 hs_csr = cpci_get_hs_csr(slot);
373 dbg("%s - slot %s HS_CSR (2) = %04x",
374 __func__, slot_name(slot), hs_csr);
375
376 slot->latch_status = 1;
377 slot->adapter_status = 1;
378
379 cpci_led_off(slot);
380
381 /* GSM, debug */
382 hs_csr = cpci_get_hs_csr(slot);
383 dbg("%s - slot %s HS_CSR (3) = %04x",
384 __func__, slot_name(slot), hs_csr);
385
386 inserted++;
387 } else if (cpci_check_ext(slot)) {
388 /* Process extraction request */
389 dbg("%s - slot %s extracted",
390 __func__, slot_name(slot));
391
392 /* GSM, debug */
393 hs_csr = cpci_get_hs_csr(slot);
394 dbg("%s - slot %s HS_CSR = %04x",
395 __func__, slot_name(slot), hs_csr);
396
397 if (!slot->extracting) {
398 slot->latch_status = 0;
399 slot->extracting = 1;
400 atomic_inc(&extracting);
401 }
402 extracted++;
403 } else if (slot->extracting) {
404 hs_csr = cpci_get_hs_csr(slot);
405 if (hs_csr == 0xffff) {
406 /*
407 * Hmmm, we're likely hosed at this point, should we
408 * bother trying to tell the driver or not?
409 */
410 err("card in slot %s was improperly removed",
411 slot_name(slot));
412 slot->adapter_status = 0;
413 slot->extracting = 0;
414 atomic_dec(&extracting);
415 }
416 }
417 }
418 up_read(&list_rwsem);
419 dbg("inserted=%d, extracted=%d, extracting=%d",
420 inserted, extracted, atomic_read(&extracting));
421 if (inserted || extracted)
422 return extracted;
423 else if (!atomic_read(&extracting)) {
424 err("cannot find ENUM# source, shutting down");
425 return -1;
426 }
427 return 0;
428}
429
430/* This is the interrupt mode worker thread body */
431static int
432event_thread(void *data)
433{
434 int rc;
435
436 dbg("%s - event thread started", __func__);
437 while (1) {
438 dbg("event thread sleeping");
439 set_current_state(TASK_INTERRUPTIBLE);
440 schedule();
441 if (kthread_should_stop())
442 break;
443 do {
444 rc = check_slots();
445 if (rc > 0) {
446 /* Give userspace a chance to handle extraction */
447 msleep(500);
448 } else if (rc < 0) {
449 dbg("%s - error checking slots", __func__);
450 thread_finished = 1;
451 goto out;
452 }
453 } while (atomic_read(&extracting) && !kthread_should_stop());
454 if (kthread_should_stop())
455 break;
456
457 /* Re-enable ENUM# interrupt */
458 dbg("%s - re-enabling irq", __func__);
459 controller->ops->enable_irq();
460 }
461 out:
462 return 0;
463}
464
465/* This is the polling mode worker thread body */
466static int
467poll_thread(void *data)
468{
469 int rc;
470
471 while (1) {
472 if (kthread_should_stop() || signal_pending(current))
473 break;
474 if (controller->ops->query_enum()) {
475 do {
476 rc = check_slots();
477 if (rc > 0) {
478 /* Give userspace a chance to handle extraction */
479 msleep(500);
480 } else if (rc < 0) {
481 dbg("%s - error checking slots", __func__);
482 thread_finished = 1;
483 goto out;
484 }
485 } while (atomic_read(&extracting) && !kthread_should_stop());
486 }
487 msleep(100);
488 }
489 out:
490 return 0;
491}
492
493static int
494cpci_start_thread(void)
495{
496 if (controller->irq)
497 cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
498 else
499 cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
500 if (IS_ERR(cpci_thread)) {
501 err("Can't start up our thread");
502 return PTR_ERR(cpci_thread);
503 }
504 thread_finished = 0;
505 return 0;
506}
507
508static void
509cpci_stop_thread(void)
510{
511 kthread_stop(cpci_thread);
512 thread_finished = 1;
513}
514
515int
516cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
517{
518 int status = 0;
519
520 if (controller)
521 return -1;
522 if (!(new_controller && new_controller->ops))
523 return -EINVAL;
524 if (new_controller->irq) {
525 if (!(new_controller->ops->enable_irq &&
526 new_controller->ops->disable_irq))
527 status = -EINVAL;
528 if (request_irq(new_controller->irq,
529 cpci_hp_intr,
530 new_controller->irq_flags,
531 MY_NAME,
532 new_controller->dev_id)) {
533 err("Can't get irq %d for the hotplug cPCI controller",
534 new_controller->irq);
535 status = -ENODEV;
536 }
537 dbg("%s - acquired controller irq %d",
538 __func__, new_controller->irq);
539 }
540 if (!status)
541 controller = new_controller;
542 return status;
543}
544EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
545
546static void
547cleanup_slots(void)
548{
549 struct slot *slot;
550 struct slot *tmp;
551
552 /*
553 * Unregister all of our slots with the pci_hotplug subsystem,
554 * and free up all memory that we had allocated.
555 */
556 down_write(&list_rwsem);
557 if (!slots)
558 goto cleanup_null;
559 list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
560 list_del(&slot->slot_list);
561 pci_hp_deregister(&slot->hotplug_slot);
562 release_slot(slot);
563 }
564cleanup_null:
565 up_write(&list_rwsem);
566}
567
568int
569cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
570{
571 int status = 0;
572
573 if (controller) {
574 if (!thread_finished)
575 cpci_stop_thread();
576 if (controller->irq)
577 free_irq(controller->irq, controller->dev_id);
578 controller = NULL;
579 cleanup_slots();
580 } else
581 status = -ENODEV;
582 return status;
583}
584EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
585
586int
587cpci_hp_start(void)
588{
589 static int first = 1;
590 int status;
591
592 dbg("%s - enter", __func__);
593 if (!controller)
594 return -ENODEV;
595
596 down_read(&list_rwsem);
597 if (list_empty(&slot_list)) {
598 up_read(&list_rwsem);
599 return -ENODEV;
600 }
601 up_read(&list_rwsem);
602
603 status = init_slots(first);
604 if (first)
605 first = 0;
606 if (status)
607 return status;
608
609 status = cpci_start_thread();
610 if (status)
611 return status;
612 dbg("%s - thread started", __func__);
613
614 if (controller->irq) {
615 /* Start enum interrupt processing */
616 dbg("%s - enabling irq", __func__);
617 controller->ops->enable_irq();
618 }
619 dbg("%s - exit", __func__);
620 return 0;
621}
622EXPORT_SYMBOL_GPL(cpci_hp_start);
623
624int
625cpci_hp_stop(void)
626{
627 if (!controller)
628 return -ENODEV;
629 if (controller->irq) {
630 /* Stop enum interrupt processing */
631 dbg("%s - disabling irq", __func__);
632 controller->ops->disable_irq();
633 }
634 cpci_stop_thread();
635 return 0;
636}
637EXPORT_SYMBOL_GPL(cpci_hp_stop);
638
639int __init
640cpci_hotplug_init(int debug)
641{
642 cpci_debug = debug;
643 return 0;
644}