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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Standard Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2003-2004 Intel Corporation
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <[email protected]>, <[email protected]>
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/types.h>
19#include <linux/slab.h>
20#include <linux/pci.h>
21#include "../pci.h"
22#include "shpchp.h"
23
24static void interrupt_event_handler(struct work_struct *work);
25static int shpchp_enable_slot(struct slot *p_slot);
26static int shpchp_disable_slot(struct slot *p_slot);
27
28static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
29{
30 struct event_info *info;
31
32 info = kmalloc_obj(*info, GFP_ATOMIC);
33 if (!info)
34 return -ENOMEM;
35
36 info->event_type = event_type;
37 info->p_slot = p_slot;
38 INIT_WORK(&info->work, interrupt_event_handler);
39
40 queue_work(p_slot->wq, &info->work);
41
42 return 0;
43}
44
45u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
46{
47 struct slot *p_slot;
48 u32 event_type;
49
50 /* Attention Button Change */
51 ctrl_dbg(ctrl, "Attention button interrupt received\n");
52
53 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
54 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
55
56 /*
57 * Button pressed - See if need to TAKE ACTION!!!
58 */
59 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
60 event_type = INT_BUTTON_PRESS;
61
62 queue_interrupt_event(p_slot, event_type);
63
64 return 0;
65
66}
67
68u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
69{
70 struct slot *p_slot;
71 u8 getstatus;
72 u32 event_type;
73
74 /* Switch Change */
75 ctrl_dbg(ctrl, "Switch interrupt received\n");
76
77 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
78 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
79 shpchp_get_latch_status(p_slot, &getstatus);
80 ctrl_dbg(ctrl, "Card present %x Power status %x\n",
81 p_slot->presence_save, p_slot->pwr_save);
82
83 if (getstatus) {
84 /*
85 * Switch opened
86 */
87 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
88 event_type = INT_SWITCH_OPEN;
89 if (p_slot->pwr_save && p_slot->presence_save) {
90 event_type = INT_POWER_FAULT;
91 ctrl_err(ctrl, "Surprise Removal of card\n");
92 }
93 } else {
94 /*
95 * Switch closed
96 */
97 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
98 event_type = INT_SWITCH_CLOSE;
99 }
100
101 queue_interrupt_event(p_slot, event_type);
102
103 return 1;
104}
105
106u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
107{
108 struct slot *p_slot;
109 u32 event_type;
110
111 /* Presence Change */
112 ctrl_dbg(ctrl, "Presence/Notify input change\n");
113
114 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
115
116 /*
117 * Save the presence state
118 */
119 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
120 if (p_slot->presence_save) {
121 /*
122 * Card Present
123 */
124 ctrl_info(ctrl, "Card present on Slot(%s)\n",
125 slot_name(p_slot));
126 event_type = INT_PRESENCE_ON;
127 } else {
128 /*
129 * Not Present
130 */
131 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
132 slot_name(p_slot));
133 event_type = INT_PRESENCE_OFF;
134 }
135
136 queue_interrupt_event(p_slot, event_type);
137
138 return 1;
139}
140
141u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
142{
143 struct slot *p_slot;
144 u32 event_type;
145
146 /* Power fault */
147 ctrl_dbg(ctrl, "Power fault interrupt received\n");
148
149 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
150
151 if (!(shpchp_query_power_fault(p_slot))) {
152 /*
153 * Power fault Cleared
154 */
155 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
156 slot_name(p_slot));
157 p_slot->status = 0x00;
158 event_type = INT_POWER_FAULT_CLEAR;
159 } else {
160 /*
161 * Power fault
162 */
163 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
164 event_type = INT_POWER_FAULT;
165 /* set power fault status for this board */
166 p_slot->status = 0xFF;
167 ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
168 }
169
170 queue_interrupt_event(p_slot, event_type);
171
172 return 1;
173}
174
175/* The following routines constitute the bulk of the
176 hotplug controller logic
177 */
178static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
179 enum pci_bus_speed speed)
180{
181 int rc = 0;
182
183 ctrl_dbg(ctrl, "Change speed to %d\n", speed);
184 rc = shpchp_set_bus_speed_mode(p_slot, speed);
185 if (rc) {
186 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
187 __func__);
188 return WRONG_BUS_FREQUENCY;
189 }
190 return rc;
191}
192
193static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
194 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
195 enum pci_bus_speed msp)
196{
197 int rc = 0;
198
199 /*
200 * If other slots on the same bus are occupied, we cannot
201 * change the bus speed.
202 */
203 if (flag) {
204 if (asp < bsp) {
205 ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n",
206 bsp, asp);
207 rc = WRONG_BUS_FREQUENCY;
208 }
209 return rc;
210 }
211
212 if (asp < msp) {
213 if (bsp != asp)
214 rc = change_bus_speed(ctrl, pslot, asp);
215 } else {
216 if (bsp != msp)
217 rc = change_bus_speed(ctrl, pslot, msp);
218 }
219 return rc;
220}
221
222/**
223 * board_added - Called after a board has been added to the system.
224 * @p_slot: target &slot
225 *
226 * Turns power on for the board.
227 * Configures board.
228 */
229static int board_added(struct slot *p_slot)
230{
231 u8 hp_slot;
232 u8 slots_not_empty = 0;
233 int rc = 0;
234 enum pci_bus_speed asp, bsp, msp;
235 struct controller *ctrl = p_slot->ctrl;
236 struct pci_bus *parent = ctrl->pci_dev->subordinate;
237
238 hp_slot = p_slot->device - ctrl->slot_device_offset;
239
240 ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
241 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
242
243 /* Power on slot without connecting to bus */
244 rc = shpchp_power_on_slot(p_slot);
245 if (rc) {
246 ctrl_err(ctrl, "Failed to power on slot\n");
247 return -1;
248 }
249
250 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
251 rc = shpchp_set_bus_speed_mode(p_slot, PCI_SPEED_33MHz);
252 if (rc) {
253 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
254 __func__);
255 return WRONG_BUS_FREQUENCY;
256 }
257
258 /* turn on board, blink green LED, turn off Amber LED */
259 rc = shpchp_slot_enable(p_slot);
260 if (rc) {
261 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
262 return rc;
263 }
264 }
265
266 rc = shpchp_get_adapter_speed(p_slot, &asp);
267 if (rc) {
268 ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n");
269 return WRONG_BUS_FREQUENCY;
270 }
271
272 bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
273 msp = ctrl->pci_dev->subordinate->max_bus_speed;
274
275 /* Check if there are other slots or devices on the same bus */
276 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
277 slots_not_empty = 1;
278
279 ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
280 __func__, slots_not_empty, asp,
281 bsp, msp);
282
283 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
284 if (rc)
285 return rc;
286
287 /* turn on board, blink green LED, turn off Amber LED */
288 rc = shpchp_slot_enable(p_slot);
289 if (rc) {
290 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
291 return rc;
292 }
293
294 /* Wait for ~1 second */
295 msleep(1000);
296
297 ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
298 /* Check for a power fault */
299 if (p_slot->status == 0xFF) {
300 /* power fault occurred, but it was benign */
301 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
302 p_slot->status = 0;
303 goto err_exit;
304 }
305
306 if (shpchp_configure_device(p_slot)) {
307 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
308 pci_domain_nr(parent), p_slot->bus, p_slot->device);
309 goto err_exit;
310 }
311
312 p_slot->status = 0;
313 p_slot->is_a_board = 0x01;
314 p_slot->pwr_save = 1;
315
316 shpchp_green_led_on(p_slot);
317
318 return 0;
319
320err_exit:
321 /* turn off slot, turn on Amber LED, turn off Green LED */
322 rc = shpchp_slot_disable(p_slot);
323 if (rc) {
324 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
325 __func__);
326 return rc;
327 }
328
329 return(rc);
330}
331
332
333/**
334 * remove_board - Turns off slot and LEDs
335 * @p_slot: target &slot
336 */
337static int remove_board(struct slot *p_slot)
338{
339 struct controller *ctrl = p_slot->ctrl;
340 u8 hp_slot;
341 int rc;
342
343 shpchp_unconfigure_device(p_slot);
344
345 hp_slot = p_slot->device - ctrl->slot_device_offset;
346 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
347
348 ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
349
350 /* Change status to shutdown */
351 if (p_slot->is_a_board)
352 p_slot->status = 0x01;
353
354 /* turn off slot, turn on Amber LED, turn off Green LED */
355 rc = shpchp_slot_disable(p_slot);
356 if (rc) {
357 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
358 __func__);
359 return rc;
360 }
361
362 rc = shpchp_set_attention_status(p_slot, 0);
363 if (rc) {
364 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
365 return rc;
366 }
367
368 p_slot->pwr_save = 0;
369 p_slot->is_a_board = 0;
370
371 return 0;
372}
373
374
375struct pushbutton_work_info {
376 struct slot *p_slot;
377 struct work_struct work;
378};
379
380/**
381 * shpchp_pushbutton_thread - handle pushbutton events
382 * @work: &struct work_struct to be handled
383 *
384 * Scheduled procedure to handle blocking stuff for the pushbuttons.
385 * Handles all pending events and exits.
386 */
387static void shpchp_pushbutton_thread(struct work_struct *work)
388{
389 struct pushbutton_work_info *info =
390 container_of(work, struct pushbutton_work_info, work);
391 struct slot *p_slot = info->p_slot;
392
393 mutex_lock(&p_slot->lock);
394 switch (p_slot->state) {
395 case POWEROFF_STATE:
396 mutex_unlock(&p_slot->lock);
397 shpchp_disable_slot(p_slot);
398 mutex_lock(&p_slot->lock);
399 p_slot->state = STATIC_STATE;
400 break;
401 case POWERON_STATE:
402 mutex_unlock(&p_slot->lock);
403 if (shpchp_enable_slot(p_slot))
404 shpchp_green_led_off(p_slot);
405 mutex_lock(&p_slot->lock);
406 p_slot->state = STATIC_STATE;
407 break;
408 default:
409 break;
410 }
411 mutex_unlock(&p_slot->lock);
412
413 kfree(info);
414}
415
416void shpchp_queue_pushbutton_work(struct work_struct *work)
417{
418 struct slot *p_slot = container_of(work, struct slot, work.work);
419 struct pushbutton_work_info *info;
420
421 info = kmalloc_obj(*info);
422 if (!info) {
423 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
424 __func__);
425 return;
426 }
427 info->p_slot = p_slot;
428 INIT_WORK(&info->work, shpchp_pushbutton_thread);
429
430 mutex_lock(&p_slot->lock);
431 switch (p_slot->state) {
432 case BLINKINGOFF_STATE:
433 p_slot->state = POWEROFF_STATE;
434 break;
435 case BLINKINGON_STATE:
436 p_slot->state = POWERON_STATE;
437 break;
438 default:
439 kfree(info);
440 goto out;
441 }
442 queue_work(p_slot->wq, &info->work);
443 out:
444 mutex_unlock(&p_slot->lock);
445}
446
447static void update_slot_info(struct slot *slot)
448{
449 shpchp_get_power_status(slot, &slot->pwr_save);
450 shpchp_get_attention_status(slot, &slot->attention_save);
451 shpchp_get_latch_status(slot, &slot->latch_save);
452 shpchp_get_adapter_status(slot, &slot->presence_save);
453}
454
455/*
456 * Note: This function must be called with slot->lock held
457 */
458static void handle_button_press_event(struct slot *p_slot)
459{
460 u8 getstatus;
461 struct controller *ctrl = p_slot->ctrl;
462
463 switch (p_slot->state) {
464 case STATIC_STATE:
465 shpchp_get_power_status(p_slot, &getstatus);
466 if (getstatus) {
467 p_slot->state = BLINKINGOFF_STATE;
468 ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
469 slot_name(p_slot));
470 } else {
471 p_slot->state = BLINKINGON_STATE;
472 ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
473 slot_name(p_slot));
474 }
475 /* blink green LED and turn off amber */
476 shpchp_green_led_blink(p_slot);
477 shpchp_set_attention_status(p_slot, 0);
478
479 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
480 break;
481 case BLINKINGOFF_STATE:
482 case BLINKINGON_STATE:
483 /*
484 * Cancel if we are still blinking; this means that we
485 * press the attention again before the 5 sec. limit
486 * expires to cancel hot-add or hot-remove
487 */
488 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
489 slot_name(p_slot));
490 cancel_delayed_work(&p_slot->work);
491 if (p_slot->state == BLINKINGOFF_STATE)
492 shpchp_green_led_on(p_slot);
493 else
494 shpchp_green_led_off(p_slot);
495 shpchp_set_attention_status(p_slot, 0);
496 ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
497 slot_name(p_slot));
498 p_slot->state = STATIC_STATE;
499 break;
500 case POWEROFF_STATE:
501 case POWERON_STATE:
502 /*
503 * Ignore if the slot is on power-on or power-off state;
504 * this means that the previous attention button action
505 * to hot-add or hot-remove is undergoing
506 */
507 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
508 slot_name(p_slot));
509 update_slot_info(p_slot);
510 break;
511 default:
512 ctrl_warn(ctrl, "Not a valid state\n");
513 break;
514 }
515}
516
517static void interrupt_event_handler(struct work_struct *work)
518{
519 struct event_info *info = container_of(work, struct event_info, work);
520 struct slot *p_slot = info->p_slot;
521
522 mutex_lock(&p_slot->lock);
523 switch (info->event_type) {
524 case INT_BUTTON_PRESS:
525 handle_button_press_event(p_slot);
526 break;
527 case INT_POWER_FAULT:
528 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
529 shpchp_set_attention_status(p_slot, 1);
530 shpchp_green_led_off(p_slot);
531 break;
532 default:
533 update_slot_info(p_slot);
534 break;
535 }
536 mutex_unlock(&p_slot->lock);
537
538 kfree(info);
539}
540
541
542static int shpchp_enable_slot (struct slot *p_slot)
543{
544 u8 getstatus = 0;
545 int rc, retval = -ENODEV;
546 struct controller *ctrl = p_slot->ctrl;
547
548 /* Check to see if (latch closed, card present, power off) */
549 mutex_lock(&p_slot->ctrl->crit_sect);
550 rc = shpchp_get_adapter_status(p_slot, &getstatus);
551 if (rc || !getstatus) {
552 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
553 goto out;
554 }
555 rc = shpchp_get_latch_status(p_slot, &getstatus);
556 if (rc || getstatus) {
557 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
558 goto out;
559 }
560 rc = shpchp_get_power_status(p_slot, &getstatus);
561 if (rc || getstatus) {
562 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
563 slot_name(p_slot));
564 goto out;
565 }
566
567 p_slot->is_a_board = 1;
568
569 /* We have to save the presence info for these slots */
570 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
571 shpchp_get_power_status(p_slot, &p_slot->pwr_save);
572 ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
573 shpchp_get_latch_status(p_slot, &getstatus);
574
575 if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD &&
576 p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458)
577 && p_slot->ctrl->num_slots == 1) {
578 /* handle AMD POGO errata; this must be done before enable */
579 amd_pogo_errata_save_misc_reg(p_slot);
580 retval = board_added(p_slot);
581 /* handle AMD POGO errata; this must be done after enable */
582 amd_pogo_errata_restore_misc_reg(p_slot);
583 } else
584 retval = board_added(p_slot);
585
586 if (retval) {
587 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
588 shpchp_get_latch_status(p_slot, &getstatus);
589 }
590
591 update_slot_info(p_slot);
592 out:
593 mutex_unlock(&p_slot->ctrl->crit_sect);
594 return retval;
595}
596
597
598static int shpchp_disable_slot (struct slot *p_slot)
599{
600 u8 getstatus = 0;
601 int rc, retval = -ENODEV;
602 struct controller *ctrl = p_slot->ctrl;
603
604 if (!p_slot->ctrl)
605 return -ENODEV;
606
607 /* Check to see if (latch closed, card present, power on) */
608 mutex_lock(&p_slot->ctrl->crit_sect);
609
610 rc = shpchp_get_adapter_status(p_slot, &getstatus);
611 if (rc || !getstatus) {
612 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
613 goto out;
614 }
615 rc = shpchp_get_latch_status(p_slot, &getstatus);
616 if (rc || getstatus) {
617 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
618 goto out;
619 }
620 rc = shpchp_get_power_status(p_slot, &getstatus);
621 if (rc || !getstatus) {
622 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
623 slot_name(p_slot));
624 goto out;
625 }
626
627 retval = remove_board(p_slot);
628 update_slot_info(p_slot);
629 out:
630 mutex_unlock(&p_slot->ctrl->crit_sect);
631 return retval;
632}
633
634int shpchp_sysfs_enable_slot(struct slot *p_slot)
635{
636 int retval = -ENODEV;
637 struct controller *ctrl = p_slot->ctrl;
638
639 mutex_lock(&p_slot->lock);
640 switch (p_slot->state) {
641 case BLINKINGON_STATE:
642 cancel_delayed_work(&p_slot->work);
643 fallthrough;
644 case STATIC_STATE:
645 p_slot->state = POWERON_STATE;
646 mutex_unlock(&p_slot->lock);
647 retval = shpchp_enable_slot(p_slot);
648 mutex_lock(&p_slot->lock);
649 p_slot->state = STATIC_STATE;
650 break;
651 case POWERON_STATE:
652 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
653 slot_name(p_slot));
654 break;
655 case BLINKINGOFF_STATE:
656 case POWEROFF_STATE:
657 ctrl_info(ctrl, "Already enabled on slot %s\n",
658 slot_name(p_slot));
659 break;
660 default:
661 ctrl_err(ctrl, "Not a valid state on slot %s\n",
662 slot_name(p_slot));
663 break;
664 }
665 mutex_unlock(&p_slot->lock);
666
667 return retval;
668}
669
670int shpchp_sysfs_disable_slot(struct slot *p_slot)
671{
672 int retval = -ENODEV;
673 struct controller *ctrl = p_slot->ctrl;
674
675 mutex_lock(&p_slot->lock);
676 switch (p_slot->state) {
677 case BLINKINGOFF_STATE:
678 cancel_delayed_work(&p_slot->work);
679 fallthrough;
680 case STATIC_STATE:
681 p_slot->state = POWEROFF_STATE;
682 mutex_unlock(&p_slot->lock);
683 retval = shpchp_disable_slot(p_slot);
684 mutex_lock(&p_slot->lock);
685 p_slot->state = STATIC_STATE;
686 break;
687 case POWEROFF_STATE:
688 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
689 slot_name(p_slot));
690 break;
691 case BLINKINGON_STATE:
692 case POWERON_STATE:
693 ctrl_info(ctrl, "Already disabled on slot %s\n",
694 slot_name(p_slot));
695 break;
696 default:
697 ctrl_err(ctrl, "Not a valid state on slot %s\n",
698 slot_name(p_slot));
699 break;
700 }
701 mutex_unlock(&p_slot->lock);
702
703 return retval;
704}