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1/*
2 * Standard Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/pci.h>
35#include "../pci.h"
36#include "shpchp.h"
37
38static void interrupt_event_handler(struct work_struct *work);
39static int shpchp_enable_slot(struct slot *p_slot);
40static int shpchp_disable_slot(struct slot *p_slot);
41
42static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
43{
44 struct event_info *info;
45
46 info = kmalloc(sizeof(*info), GFP_ATOMIC);
47 if (!info)
48 return -ENOMEM;
49
50 info->event_type = event_type;
51 info->p_slot = p_slot;
52 INIT_WORK(&info->work, interrupt_event_handler);
53
54 queue_work(shpchp_wq, &info->work);
55
56 return 0;
57}
58
59u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
60{
61 struct slot *p_slot;
62 u32 event_type;
63
64 /* Attention Button Change */
65 ctrl_dbg(ctrl, "Attention button interrupt received\n");
66
67 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
68 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
69
70 /*
71 * Button pressed - See if need to TAKE ACTION!!!
72 */
73 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
74 event_type = INT_BUTTON_PRESS;
75
76 queue_interrupt_event(p_slot, event_type);
77
78 return 0;
79
80}
81
82u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
83{
84 struct slot *p_slot;
85 u8 getstatus;
86 u32 event_type;
87
88 /* Switch Change */
89 ctrl_dbg(ctrl, "Switch interrupt received\n");
90
91 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
92 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
93 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
94 ctrl_dbg(ctrl, "Card present %x Power status %x\n",
95 p_slot->presence_save, p_slot->pwr_save);
96
97 if (getstatus) {
98 /*
99 * Switch opened
100 */
101 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
102 event_type = INT_SWITCH_OPEN;
103 if (p_slot->pwr_save && p_slot->presence_save) {
104 event_type = INT_POWER_FAULT;
105 ctrl_err(ctrl, "Surprise Removal of card\n");
106 }
107 } else {
108 /*
109 * Switch closed
110 */
111 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
112 event_type = INT_SWITCH_CLOSE;
113 }
114
115 queue_interrupt_event(p_slot, event_type);
116
117 return 1;
118}
119
120u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
121{
122 struct slot *p_slot;
123 u32 event_type;
124
125 /* Presence Change */
126 ctrl_dbg(ctrl, "Presence/Notify input change\n");
127
128 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
129
130 /*
131 * Save the presence state
132 */
133 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
134 if (p_slot->presence_save) {
135 /*
136 * Card Present
137 */
138 ctrl_info(ctrl, "Card present on Slot(%s)\n",
139 slot_name(p_slot));
140 event_type = INT_PRESENCE_ON;
141 } else {
142 /*
143 * Not Present
144 */
145 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
146 slot_name(p_slot));
147 event_type = INT_PRESENCE_OFF;
148 }
149
150 queue_interrupt_event(p_slot, event_type);
151
152 return 1;
153}
154
155u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
156{
157 struct slot *p_slot;
158 u32 event_type;
159
160 /* Power fault */
161 ctrl_dbg(ctrl, "Power fault interrupt received\n");
162
163 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
164
165 if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
166 /*
167 * Power fault Cleared
168 */
169 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
170 slot_name(p_slot));
171 p_slot->status = 0x00;
172 event_type = INT_POWER_FAULT_CLEAR;
173 } else {
174 /*
175 * Power fault
176 */
177 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
178 event_type = INT_POWER_FAULT;
179 /* set power fault status for this board */
180 p_slot->status = 0xFF;
181 ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
182 }
183
184 queue_interrupt_event(p_slot, event_type);
185
186 return 1;
187}
188
189/* The following routines constitute the bulk of the
190 hotplug controller logic
191 */
192static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
193 enum pci_bus_speed speed)
194{
195 int rc = 0;
196
197 ctrl_dbg(ctrl, "Change speed to %d\n", speed);
198 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
199 ctrl_err(ctrl, "%s: Issue of set bus speed mode command "
200 "failed\n", __func__);
201 return WRONG_BUS_FREQUENCY;
202 }
203 return rc;
204}
205
206static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
207 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
208 enum pci_bus_speed msp)
209{
210 int rc = 0;
211
212 /*
213 * If other slots on the same bus are occupied, we cannot
214 * change the bus speed.
215 */
216 if (flag) {
217 if (asp < bsp) {
218 ctrl_err(ctrl, "Speed of bus %x and adapter %x "
219 "mismatch\n", bsp, asp);
220 rc = WRONG_BUS_FREQUENCY;
221 }
222 return rc;
223 }
224
225 if (asp < msp) {
226 if (bsp != asp)
227 rc = change_bus_speed(ctrl, pslot, asp);
228 } else {
229 if (bsp != msp)
230 rc = change_bus_speed(ctrl, pslot, msp);
231 }
232 return rc;
233}
234
235/**
236 * board_added - Called after a board has been added to the system.
237 * @p_slot: target &slot
238 *
239 * Turns power on for the board.
240 * Configures board.
241 */
242static int board_added(struct slot *p_slot)
243{
244 u8 hp_slot;
245 u8 slots_not_empty = 0;
246 int rc = 0;
247 enum pci_bus_speed asp, bsp, msp;
248 struct controller *ctrl = p_slot->ctrl;
249 struct pci_bus *parent = ctrl->pci_dev->subordinate;
250
251 hp_slot = p_slot->device - ctrl->slot_device_offset;
252
253 ctrl_dbg(ctrl,
254 "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
255 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
256
257 /* Power on slot without connecting to bus */
258 rc = p_slot->hpc_ops->power_on_slot(p_slot);
259 if (rc) {
260 ctrl_err(ctrl, "Failed to power on slot\n");
261 return -1;
262 }
263
264 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
265 if (slots_not_empty)
266 return WRONG_BUS_FREQUENCY;
267
268 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
269 ctrl_err(ctrl, "%s: Issue of set bus speed mode command"
270 " failed\n", __func__);
271 return WRONG_BUS_FREQUENCY;
272 }
273
274 /* turn on board, blink green LED, turn off Amber LED */
275 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
276 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
277 return rc;
278 }
279 }
280
281 rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
282 if (rc) {
283 ctrl_err(ctrl, "Can't get adapter speed or "
284 "bus mode mismatch\n");
285 return WRONG_BUS_FREQUENCY;
286 }
287
288 bsp = ctrl->pci_dev->bus->cur_bus_speed;
289 msp = ctrl->pci_dev->bus->max_bus_speed;
290
291 /* Check if there are other slots or devices on the same bus */
292 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
293 slots_not_empty = 1;
294
295 ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d,"
296 " max_bus_speed %d\n", __func__, slots_not_empty, asp,
297 bsp, msp);
298
299 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
300 if (rc)
301 return rc;
302
303 /* turn on board, blink green LED, turn off Amber LED */
304 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
305 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
306 return rc;
307 }
308
309 /* Wait for ~1 second */
310 msleep(1000);
311
312 ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
313 /* Check for a power fault */
314 if (p_slot->status == 0xFF) {
315 /* power fault occurred, but it was benign */
316 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
317 rc = POWER_FAILURE;
318 p_slot->status = 0;
319 goto err_exit;
320 }
321
322 if (shpchp_configure_device(p_slot)) {
323 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
324 pci_domain_nr(parent), p_slot->bus, p_slot->device);
325 goto err_exit;
326 }
327
328 p_slot->status = 0;
329 p_slot->is_a_board = 0x01;
330 p_slot->pwr_save = 1;
331
332 p_slot->hpc_ops->green_led_on(p_slot);
333
334 return 0;
335
336err_exit:
337 /* turn off slot, turn on Amber LED, turn off Green LED */
338 rc = p_slot->hpc_ops->slot_disable(p_slot);
339 if (rc) {
340 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
341 __func__);
342 return rc;
343 }
344
345 return(rc);
346}
347
348
349/**
350 * remove_board - Turns off slot and LEDs
351 * @p_slot: target &slot
352 */
353static int remove_board(struct slot *p_slot)
354{
355 struct controller *ctrl = p_slot->ctrl;
356 u8 hp_slot;
357 int rc;
358
359 if (shpchp_unconfigure_device(p_slot))
360 return(1);
361
362 hp_slot = p_slot->device - ctrl->slot_device_offset;
363 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
364
365 ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
366
367 /* Change status to shutdown */
368 if (p_slot->is_a_board)
369 p_slot->status = 0x01;
370
371 /* turn off slot, turn on Amber LED, turn off Green LED */
372 rc = p_slot->hpc_ops->slot_disable(p_slot);
373 if (rc) {
374 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
375 __func__);
376 return rc;
377 }
378
379 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
380 if (rc) {
381 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
382 return rc;
383 }
384
385 p_slot->pwr_save = 0;
386 p_slot->is_a_board = 0;
387
388 return 0;
389}
390
391
392struct pushbutton_work_info {
393 struct slot *p_slot;
394 struct work_struct work;
395};
396
397/**
398 * shpchp_pushbutton_thread - handle pushbutton events
399 * @work: &struct work_struct to be handled
400 *
401 * Scheduled procedure to handle blocking stuff for the pushbuttons.
402 * Handles all pending events and exits.
403 */
404static void shpchp_pushbutton_thread(struct work_struct *work)
405{
406 struct pushbutton_work_info *info =
407 container_of(work, struct pushbutton_work_info, work);
408 struct slot *p_slot = info->p_slot;
409
410 mutex_lock(&p_slot->lock);
411 switch (p_slot->state) {
412 case POWEROFF_STATE:
413 mutex_unlock(&p_slot->lock);
414 shpchp_disable_slot(p_slot);
415 mutex_lock(&p_slot->lock);
416 p_slot->state = STATIC_STATE;
417 break;
418 case POWERON_STATE:
419 mutex_unlock(&p_slot->lock);
420 if (shpchp_enable_slot(p_slot))
421 p_slot->hpc_ops->green_led_off(p_slot);
422 mutex_lock(&p_slot->lock);
423 p_slot->state = STATIC_STATE;
424 break;
425 default:
426 break;
427 }
428 mutex_unlock(&p_slot->lock);
429
430 kfree(info);
431}
432
433void shpchp_queue_pushbutton_work(struct work_struct *work)
434{
435 struct slot *p_slot = container_of(work, struct slot, work.work);
436 struct pushbutton_work_info *info;
437
438 info = kmalloc(sizeof(*info), GFP_KERNEL);
439 if (!info) {
440 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
441 __func__);
442 return;
443 }
444 info->p_slot = p_slot;
445 INIT_WORK(&info->work, shpchp_pushbutton_thread);
446
447 mutex_lock(&p_slot->lock);
448 switch (p_slot->state) {
449 case BLINKINGOFF_STATE:
450 p_slot->state = POWEROFF_STATE;
451 break;
452 case BLINKINGON_STATE:
453 p_slot->state = POWERON_STATE;
454 break;
455 default:
456 kfree(info);
457 goto out;
458 }
459 queue_work(shpchp_ordered_wq, &info->work);
460 out:
461 mutex_unlock(&p_slot->lock);
462}
463
464static int update_slot_info (struct slot *slot)
465{
466 struct hotplug_slot_info *info;
467 int result;
468
469 info = kmalloc(sizeof(*info), GFP_KERNEL);
470 if (!info)
471 return -ENOMEM;
472
473 slot->hpc_ops->get_power_status(slot, &(info->power_status));
474 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
475 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
476 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
477
478 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
479 kfree (info);
480 return result;
481}
482
483/*
484 * Note: This function must be called with slot->lock held
485 */
486static void handle_button_press_event(struct slot *p_slot)
487{
488 u8 getstatus;
489 struct controller *ctrl = p_slot->ctrl;
490
491 switch (p_slot->state) {
492 case STATIC_STATE:
493 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
494 if (getstatus) {
495 p_slot->state = BLINKINGOFF_STATE;
496 ctrl_info(ctrl, "PCI slot #%s - powering off due to "
497 "button press.\n", slot_name(p_slot));
498 } else {
499 p_slot->state = BLINKINGON_STATE;
500 ctrl_info(ctrl, "PCI slot #%s - powering on due to "
501 "button press.\n", slot_name(p_slot));
502 }
503 /* blink green LED and turn off amber */
504 p_slot->hpc_ops->green_led_blink(p_slot);
505 p_slot->hpc_ops->set_attention_status(p_slot, 0);
506
507 queue_delayed_work(shpchp_wq, &p_slot->work, 5*HZ);
508 break;
509 case BLINKINGOFF_STATE:
510 case BLINKINGON_STATE:
511 /*
512 * Cancel if we are still blinking; this means that we
513 * press the attention again before the 5 sec. limit
514 * expires to cancel hot-add or hot-remove
515 */
516 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
517 slot_name(p_slot));
518 cancel_delayed_work(&p_slot->work);
519 if (p_slot->state == BLINKINGOFF_STATE)
520 p_slot->hpc_ops->green_led_on(p_slot);
521 else
522 p_slot->hpc_ops->green_led_off(p_slot);
523 p_slot->hpc_ops->set_attention_status(p_slot, 0);
524 ctrl_info(ctrl, "PCI slot #%s - action canceled due to "
525 "button press\n", slot_name(p_slot));
526 p_slot->state = STATIC_STATE;
527 break;
528 case POWEROFF_STATE:
529 case POWERON_STATE:
530 /*
531 * Ignore if the slot is on power-on or power-off state;
532 * this means that the previous attention button action
533 * to hot-add or hot-remove is undergoing
534 */
535 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
536 slot_name(p_slot));
537 update_slot_info(p_slot);
538 break;
539 default:
540 ctrl_warn(ctrl, "Not a valid state\n");
541 break;
542 }
543}
544
545static void interrupt_event_handler(struct work_struct *work)
546{
547 struct event_info *info = container_of(work, struct event_info, work);
548 struct slot *p_slot = info->p_slot;
549
550 mutex_lock(&p_slot->lock);
551 switch (info->event_type) {
552 case INT_BUTTON_PRESS:
553 handle_button_press_event(p_slot);
554 break;
555 case INT_POWER_FAULT:
556 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
557 p_slot->hpc_ops->set_attention_status(p_slot, 1);
558 p_slot->hpc_ops->green_led_off(p_slot);
559 break;
560 default:
561 update_slot_info(p_slot);
562 break;
563 }
564 mutex_unlock(&p_slot->lock);
565
566 kfree(info);
567}
568
569
570static int shpchp_enable_slot (struct slot *p_slot)
571{
572 u8 getstatus = 0;
573 int rc, retval = -ENODEV;
574 struct controller *ctrl = p_slot->ctrl;
575
576 /* Check to see if (latch closed, card present, power off) */
577 mutex_lock(&p_slot->ctrl->crit_sect);
578 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
579 if (rc || !getstatus) {
580 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
581 goto out;
582 }
583 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
584 if (rc || getstatus) {
585 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
586 goto out;
587 }
588 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
589 if (rc || getstatus) {
590 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
591 slot_name(p_slot));
592 goto out;
593 }
594
595 p_slot->is_a_board = 1;
596
597 /* We have to save the presence info for these slots */
598 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
599 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
600 ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
601 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
602
603 if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
604 (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
605 && p_slot->ctrl->num_slots == 1) {
606 /* handle amd pogo errata; this must be done before enable */
607 amd_pogo_errata_save_misc_reg(p_slot);
608 retval = board_added(p_slot);
609 /* handle amd pogo errata; this must be done after enable */
610 amd_pogo_errata_restore_misc_reg(p_slot);
611 } else
612 retval = board_added(p_slot);
613
614 if (retval) {
615 p_slot->hpc_ops->get_adapter_status(p_slot,
616 &(p_slot->presence_save));
617 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
618 }
619
620 update_slot_info(p_slot);
621 out:
622 mutex_unlock(&p_slot->ctrl->crit_sect);
623 return retval;
624}
625
626
627static int shpchp_disable_slot (struct slot *p_slot)
628{
629 u8 getstatus = 0;
630 int rc, retval = -ENODEV;
631 struct controller *ctrl = p_slot->ctrl;
632
633 if (!p_slot->ctrl)
634 return -ENODEV;
635
636 /* Check to see if (latch closed, card present, power on) */
637 mutex_lock(&p_slot->ctrl->crit_sect);
638
639 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
640 if (rc || !getstatus) {
641 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
642 goto out;
643 }
644 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
645 if (rc || getstatus) {
646 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
647 goto out;
648 }
649 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
650 if (rc || !getstatus) {
651 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
652 slot_name(p_slot));
653 goto out;
654 }
655
656 retval = remove_board(p_slot);
657 update_slot_info(p_slot);
658 out:
659 mutex_unlock(&p_slot->ctrl->crit_sect);
660 return retval;
661}
662
663int shpchp_sysfs_enable_slot(struct slot *p_slot)
664{
665 int retval = -ENODEV;
666 struct controller *ctrl = p_slot->ctrl;
667
668 mutex_lock(&p_slot->lock);
669 switch (p_slot->state) {
670 case BLINKINGON_STATE:
671 cancel_delayed_work(&p_slot->work);
672 case STATIC_STATE:
673 p_slot->state = POWERON_STATE;
674 mutex_unlock(&p_slot->lock);
675 retval = shpchp_enable_slot(p_slot);
676 mutex_lock(&p_slot->lock);
677 p_slot->state = STATIC_STATE;
678 break;
679 case POWERON_STATE:
680 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
681 slot_name(p_slot));
682 break;
683 case BLINKINGOFF_STATE:
684 case POWEROFF_STATE:
685 ctrl_info(ctrl, "Already enabled on slot %s\n",
686 slot_name(p_slot));
687 break;
688 default:
689 ctrl_err(ctrl, "Not a valid state on slot %s\n",
690 slot_name(p_slot));
691 break;
692 }
693 mutex_unlock(&p_slot->lock);
694
695 return retval;
696}
697
698int shpchp_sysfs_disable_slot(struct slot *p_slot)
699{
700 int retval = -ENODEV;
701 struct controller *ctrl = p_slot->ctrl;
702
703 mutex_lock(&p_slot->lock);
704 switch (p_slot->state) {
705 case BLINKINGOFF_STATE:
706 cancel_delayed_work(&p_slot->work);
707 case STATIC_STATE:
708 p_slot->state = POWEROFF_STATE;
709 mutex_unlock(&p_slot->lock);
710 retval = shpchp_disable_slot(p_slot);
711 mutex_lock(&p_slot->lock);
712 p_slot->state = STATIC_STATE;
713 break;
714 case POWEROFF_STATE:
715 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
716 slot_name(p_slot));
717 break;
718 case BLINKINGON_STATE:
719 case POWERON_STATE:
720 ctrl_info(ctrl, "Already disabled on slot %s\n",
721 slot_name(p_slot));
722 break;
723 default:
724 ctrl_err(ctrl, "Not a valid state on slot %s\n",
725 slot_name(p_slot));
726 break;
727 }
728 mutex_unlock(&p_slot->lock);
729
730 return retval;
731}
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 (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2003-2004 Intel Corporation
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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(sizeof(*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 p_slot->hpc_ops->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 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
79 p_slot->hpc_ops->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 p_slot->hpc_ops->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 (!(p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 rc = POWER_FAILURE;
303 p_slot->status = 0;
304 goto err_exit;
305 }
306
307 if (shpchp_configure_device(p_slot)) {
308 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
309 pci_domain_nr(parent), p_slot->bus, p_slot->device);
310 goto err_exit;
311 }
312
313 p_slot->status = 0;
314 p_slot->is_a_board = 0x01;
315 p_slot->pwr_save = 1;
316
317 p_slot->hpc_ops->green_led_on(p_slot);
318
319 return 0;
320
321err_exit:
322 /* turn off slot, turn on Amber LED, turn off Green LED */
323 rc = p_slot->hpc_ops->slot_disable(p_slot);
324 if (rc) {
325 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
326 __func__);
327 return rc;
328 }
329
330 return(rc);
331}
332
333
334/**
335 * remove_board - Turns off slot and LEDs
336 * @p_slot: target &slot
337 */
338static int remove_board(struct slot *p_slot)
339{
340 struct controller *ctrl = p_slot->ctrl;
341 u8 hp_slot;
342 int rc;
343
344 shpchp_unconfigure_device(p_slot);
345
346 hp_slot = p_slot->device - ctrl->slot_device_offset;
347 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
348
349 ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
350
351 /* Change status to shutdown */
352 if (p_slot->is_a_board)
353 p_slot->status = 0x01;
354
355 /* turn off slot, turn on Amber LED, turn off Green LED */
356 rc = p_slot->hpc_ops->slot_disable(p_slot);
357 if (rc) {
358 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
359 __func__);
360 return rc;
361 }
362
363 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
364 if (rc) {
365 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
366 return rc;
367 }
368
369 p_slot->pwr_save = 0;
370 p_slot->is_a_board = 0;
371
372 return 0;
373}
374
375
376struct pushbutton_work_info {
377 struct slot *p_slot;
378 struct work_struct work;
379};
380
381/**
382 * shpchp_pushbutton_thread - handle pushbutton events
383 * @work: &struct work_struct to be handled
384 *
385 * Scheduled procedure to handle blocking stuff for the pushbuttons.
386 * Handles all pending events and exits.
387 */
388static void shpchp_pushbutton_thread(struct work_struct *work)
389{
390 struct pushbutton_work_info *info =
391 container_of(work, struct pushbutton_work_info, work);
392 struct slot *p_slot = info->p_slot;
393
394 mutex_lock(&p_slot->lock);
395 switch (p_slot->state) {
396 case POWEROFF_STATE:
397 mutex_unlock(&p_slot->lock);
398 shpchp_disable_slot(p_slot);
399 mutex_lock(&p_slot->lock);
400 p_slot->state = STATIC_STATE;
401 break;
402 case POWERON_STATE:
403 mutex_unlock(&p_slot->lock);
404 if (shpchp_enable_slot(p_slot))
405 p_slot->hpc_ops->green_led_off(p_slot);
406 mutex_lock(&p_slot->lock);
407 p_slot->state = STATIC_STATE;
408 break;
409 default:
410 break;
411 }
412 mutex_unlock(&p_slot->lock);
413
414 kfree(info);
415}
416
417void shpchp_queue_pushbutton_work(struct work_struct *work)
418{
419 struct slot *p_slot = container_of(work, struct slot, work.work);
420 struct pushbutton_work_info *info;
421
422 info = kmalloc(sizeof(*info), GFP_KERNEL);
423 if (!info) {
424 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
425 __func__);
426 return;
427 }
428 info->p_slot = p_slot;
429 INIT_WORK(&info->work, shpchp_pushbutton_thread);
430
431 mutex_lock(&p_slot->lock);
432 switch (p_slot->state) {
433 case BLINKINGOFF_STATE:
434 p_slot->state = POWEROFF_STATE;
435 break;
436 case BLINKINGON_STATE:
437 p_slot->state = POWERON_STATE;
438 break;
439 default:
440 kfree(info);
441 goto out;
442 }
443 queue_work(p_slot->wq, &info->work);
444 out:
445 mutex_unlock(&p_slot->lock);
446}
447
448static void update_slot_info(struct slot *slot)
449{
450 slot->hpc_ops->get_power_status(slot, &slot->pwr_save);
451 slot->hpc_ops->get_attention_status(slot, &slot->attention_save);
452 slot->hpc_ops->get_latch_status(slot, &slot->latch_save);
453 slot->hpc_ops->get_adapter_status(slot, &slot->presence_save);
454}
455
456/*
457 * Note: This function must be called with slot->lock held
458 */
459static void handle_button_press_event(struct slot *p_slot)
460{
461 u8 getstatus;
462 struct controller *ctrl = p_slot->ctrl;
463
464 switch (p_slot->state) {
465 case STATIC_STATE:
466 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
467 if (getstatus) {
468 p_slot->state = BLINKINGOFF_STATE;
469 ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
470 slot_name(p_slot));
471 } else {
472 p_slot->state = BLINKINGON_STATE;
473 ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
474 slot_name(p_slot));
475 }
476 /* blink green LED and turn off amber */
477 p_slot->hpc_ops->green_led_blink(p_slot);
478 p_slot->hpc_ops->set_attention_status(p_slot, 0);
479
480 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
481 break;
482 case BLINKINGOFF_STATE:
483 case BLINKINGON_STATE:
484 /*
485 * Cancel if we are still blinking; this means that we
486 * press the attention again before the 5 sec. limit
487 * expires to cancel hot-add or hot-remove
488 */
489 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
490 slot_name(p_slot));
491 cancel_delayed_work(&p_slot->work);
492 if (p_slot->state == BLINKINGOFF_STATE)
493 p_slot->hpc_ops->green_led_on(p_slot);
494 else
495 p_slot->hpc_ops->green_led_off(p_slot);
496 p_slot->hpc_ops->set_attention_status(p_slot, 0);
497 ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
498 slot_name(p_slot));
499 p_slot->state = STATIC_STATE;
500 break;
501 case POWEROFF_STATE:
502 case POWERON_STATE:
503 /*
504 * Ignore if the slot is on power-on or power-off state;
505 * this means that the previous attention button action
506 * to hot-add or hot-remove is undergoing
507 */
508 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
509 slot_name(p_slot));
510 update_slot_info(p_slot);
511 break;
512 default:
513 ctrl_warn(ctrl, "Not a valid state\n");
514 break;
515 }
516}
517
518static void interrupt_event_handler(struct work_struct *work)
519{
520 struct event_info *info = container_of(work, struct event_info, work);
521 struct slot *p_slot = info->p_slot;
522
523 mutex_lock(&p_slot->lock);
524 switch (info->event_type) {
525 case INT_BUTTON_PRESS:
526 handle_button_press_event(p_slot);
527 break;
528 case INT_POWER_FAULT:
529 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
530 p_slot->hpc_ops->set_attention_status(p_slot, 1);
531 p_slot->hpc_ops->green_led_off(p_slot);
532 break;
533 default:
534 update_slot_info(p_slot);
535 break;
536 }
537 mutex_unlock(&p_slot->lock);
538
539 kfree(info);
540}
541
542
543static int shpchp_enable_slot (struct slot *p_slot)
544{
545 u8 getstatus = 0;
546 int rc, retval = -ENODEV;
547 struct controller *ctrl = p_slot->ctrl;
548
549 /* Check to see if (latch closed, card present, power off) */
550 mutex_lock(&p_slot->ctrl->crit_sect);
551 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
552 if (rc || !getstatus) {
553 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
554 goto out;
555 }
556 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
557 if (rc || getstatus) {
558 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
559 goto out;
560 }
561 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
562 if (rc || getstatus) {
563 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
564 slot_name(p_slot));
565 goto out;
566 }
567
568 p_slot->is_a_board = 1;
569
570 /* We have to save the presence info for these slots */
571 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
572 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
573 ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
574 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
575
576 if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD &&
577 p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458)
578 && p_slot->ctrl->num_slots == 1) {
579 /* handle AMD POGO errata; this must be done before enable */
580 amd_pogo_errata_save_misc_reg(p_slot);
581 retval = board_added(p_slot);
582 /* handle AMD POGO errata; this must be done after enable */
583 amd_pogo_errata_restore_misc_reg(p_slot);
584 } else
585 retval = board_added(p_slot);
586
587 if (retval) {
588 p_slot->hpc_ops->get_adapter_status(p_slot,
589 &(p_slot->presence_save));
590 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
591 }
592
593 update_slot_info(p_slot);
594 out:
595 mutex_unlock(&p_slot->ctrl->crit_sect);
596 return retval;
597}
598
599
600static int shpchp_disable_slot (struct slot *p_slot)
601{
602 u8 getstatus = 0;
603 int rc, retval = -ENODEV;
604 struct controller *ctrl = p_slot->ctrl;
605
606 if (!p_slot->ctrl)
607 return -ENODEV;
608
609 /* Check to see if (latch closed, card present, power on) */
610 mutex_lock(&p_slot->ctrl->crit_sect);
611
612 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
613 if (rc || !getstatus) {
614 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
615 goto out;
616 }
617 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
618 if (rc || getstatus) {
619 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
620 goto out;
621 }
622 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
623 if (rc || !getstatus) {
624 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
625 slot_name(p_slot));
626 goto out;
627 }
628
629 retval = remove_board(p_slot);
630 update_slot_info(p_slot);
631 out:
632 mutex_unlock(&p_slot->ctrl->crit_sect);
633 return retval;
634}
635
636int shpchp_sysfs_enable_slot(struct slot *p_slot)
637{
638 int retval = -ENODEV;
639 struct controller *ctrl = p_slot->ctrl;
640
641 mutex_lock(&p_slot->lock);
642 switch (p_slot->state) {
643 case BLINKINGON_STATE:
644 cancel_delayed_work(&p_slot->work);
645 fallthrough;
646 case STATIC_STATE:
647 p_slot->state = POWERON_STATE;
648 mutex_unlock(&p_slot->lock);
649 retval = shpchp_enable_slot(p_slot);
650 mutex_lock(&p_slot->lock);
651 p_slot->state = STATIC_STATE;
652 break;
653 case POWERON_STATE:
654 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
655 slot_name(p_slot));
656 break;
657 case BLINKINGOFF_STATE:
658 case POWEROFF_STATE:
659 ctrl_info(ctrl, "Already enabled on slot %s\n",
660 slot_name(p_slot));
661 break;
662 default:
663 ctrl_err(ctrl, "Not a valid state on slot %s\n",
664 slot_name(p_slot));
665 break;
666 }
667 mutex_unlock(&p_slot->lock);
668
669 return retval;
670}
671
672int shpchp_sysfs_disable_slot(struct slot *p_slot)
673{
674 int retval = -ENODEV;
675 struct controller *ctrl = p_slot->ctrl;
676
677 mutex_lock(&p_slot->lock);
678 switch (p_slot->state) {
679 case BLINKINGOFF_STATE:
680 cancel_delayed_work(&p_slot->work);
681 fallthrough;
682 case STATIC_STATE:
683 p_slot->state = POWEROFF_STATE;
684 mutex_unlock(&p_slot->lock);
685 retval = shpchp_disable_slot(p_slot);
686 mutex_lock(&p_slot->lock);
687 p_slot->state = STATIC_STATE;
688 break;
689 case POWEROFF_STATE:
690 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
691 slot_name(p_slot));
692 break;
693 case BLINKINGON_STATE:
694 case POWERON_STATE:
695 ctrl_info(ctrl, "Already disabled on slot %s\n",
696 slot_name(p_slot));
697 break;
698 default:
699 ctrl_err(ctrl, "Not a valid state on slot %s\n",
700 slot_name(p_slot));
701 break;
702 }
703 mutex_unlock(&p_slot->lock);
704
705 return retval;
706}