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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 (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 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 p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 p_slot->hpc_ops->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(sizeof(*info), GFP_KERNEL);
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 slot->hpc_ops->get_power_status(slot, &slot->pwr_save);
450 slot->hpc_ops->get_attention_status(slot, &slot->attention_save);
451 slot->hpc_ops->get_latch_status(slot, &slot->latch_save);
452 slot->hpc_ops->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 p_slot->hpc_ops->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 p_slot->hpc_ops->green_led_blink(p_slot);
477 p_slot->hpc_ops->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 p_slot->hpc_ops->green_led_on(p_slot);
493 else
494 p_slot->hpc_ops->green_led_off(p_slot);
495 p_slot->hpc_ops->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 p_slot->hpc_ops->set_attention_status(p_slot, 1);
530 p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 = p_slot->hpc_ops->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 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
571 p_slot->hpc_ops->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 p_slot->hpc_ops->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 p_slot->hpc_ops->get_adapter_status(p_slot,
588 &(p_slot->presence_save));
589 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
590 }
591
592 update_slot_info(p_slot);
593 out:
594 mutex_unlock(&p_slot->ctrl->crit_sect);
595 return retval;
596}
597
598
599static int shpchp_disable_slot (struct slot *p_slot)
600{
601 u8 getstatus = 0;
602 int rc, retval = -ENODEV;
603 struct controller *ctrl = p_slot->ctrl;
604
605 if (!p_slot->ctrl)
606 return -ENODEV;
607
608 /* Check to see if (latch closed, card present, power on) */
609 mutex_lock(&p_slot->ctrl->crit_sect);
610
611 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
612 if (rc || !getstatus) {
613 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
614 goto out;
615 }
616 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
617 if (rc || getstatus) {
618 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
619 goto out;
620 }
621 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
622 if (rc || !getstatus) {
623 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
624 slot_name(p_slot));
625 goto out;
626 }
627
628 retval = remove_board(p_slot);
629 update_slot_info(p_slot);
630 out:
631 mutex_unlock(&p_slot->ctrl->crit_sect);
632 return retval;
633}
634
635int shpchp_sysfs_enable_slot(struct slot *p_slot)
636{
637 int retval = -ENODEV;
638 struct controller *ctrl = p_slot->ctrl;
639
640 mutex_lock(&p_slot->lock);
641 switch (p_slot->state) {
642 case BLINKINGON_STATE:
643 cancel_delayed_work(&p_slot->work);
644 fallthrough;
645 case STATIC_STATE:
646 p_slot->state = POWERON_STATE;
647 mutex_unlock(&p_slot->lock);
648 retval = shpchp_enable_slot(p_slot);
649 mutex_lock(&p_slot->lock);
650 p_slot->state = STATIC_STATE;
651 break;
652 case POWERON_STATE:
653 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
654 slot_name(p_slot));
655 break;
656 case BLINKINGOFF_STATE:
657 case POWEROFF_STATE:
658 ctrl_info(ctrl, "Already enabled on slot %s\n",
659 slot_name(p_slot));
660 break;
661 default:
662 ctrl_err(ctrl, "Not a valid state on slot %s\n",
663 slot_name(p_slot));
664 break;
665 }
666 mutex_unlock(&p_slot->lock);
667
668 return retval;
669}
670
671int shpchp_sysfs_disable_slot(struct slot *p_slot)
672{
673 int retval = -ENODEV;
674 struct controller *ctrl = p_slot->ctrl;
675
676 mutex_lock(&p_slot->lock);
677 switch (p_slot->state) {
678 case BLINKINGOFF_STATE:
679 cancel_delayed_work(&p_slot->work);
680 fallthrough;
681 case STATIC_STATE:
682 p_slot->state = POWEROFF_STATE;
683 mutex_unlock(&p_slot->lock);
684 retval = shpchp_disable_slot(p_slot);
685 mutex_lock(&p_slot->lock);
686 p_slot->state = STATIC_STATE;
687 break;
688 case POWEROFF_STATE:
689 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
690 slot_name(p_slot));
691 break;
692 case BLINKINGON_STATE:
693 case POWERON_STATE:
694 ctrl_info(ctrl, "Already disabled on slot %s\n",
695 slot_name(p_slot));
696 break;
697 default:
698 ctrl_err(ctrl, "Not a valid state on slot %s\n",
699 slot_name(p_slot));
700 break;
701 }
702 mutex_unlock(&p_slot->lock);
703
704 return retval;
705}
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(p_slot->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 ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
266 ctrl_err(ctrl, "%s: Issue of set bus speed mode command"
267 " failed\n", __func__);
268 return WRONG_BUS_FREQUENCY;
269 }
270
271 /* turn on board, blink green LED, turn off Amber LED */
272 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
273 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
274 return rc;
275 }
276 }
277
278 rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
279 if (rc) {
280 ctrl_err(ctrl, "Can't get adapter speed or "
281 "bus mode mismatch\n");
282 return WRONG_BUS_FREQUENCY;
283 }
284
285 bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
286 msp = ctrl->pci_dev->subordinate->max_bus_speed;
287
288 /* Check if there are other slots or devices on the same bus */
289 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
290 slots_not_empty = 1;
291
292 ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d,"
293 " max_bus_speed %d\n", __func__, slots_not_empty, asp,
294 bsp, msp);
295
296 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
297 if (rc)
298 return rc;
299
300 /* turn on board, blink green LED, turn off Amber LED */
301 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
302 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
303 return rc;
304 }
305
306 /* Wait for ~1 second */
307 msleep(1000);
308
309 ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
310 /* Check for a power fault */
311 if (p_slot->status == 0xFF) {
312 /* power fault occurred, but it was benign */
313 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
314 rc = POWER_FAILURE;
315 p_slot->status = 0;
316 goto err_exit;
317 }
318
319 if (shpchp_configure_device(p_slot)) {
320 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
321 pci_domain_nr(parent), p_slot->bus, p_slot->device);
322 goto err_exit;
323 }
324
325 p_slot->status = 0;
326 p_slot->is_a_board = 0x01;
327 p_slot->pwr_save = 1;
328
329 p_slot->hpc_ops->green_led_on(p_slot);
330
331 return 0;
332
333err_exit:
334 /* turn off slot, turn on Amber LED, turn off Green LED */
335 rc = p_slot->hpc_ops->slot_disable(p_slot);
336 if (rc) {
337 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
338 __func__);
339 return rc;
340 }
341
342 return(rc);
343}
344
345
346/**
347 * remove_board - Turns off slot and LEDs
348 * @p_slot: target &slot
349 */
350static int remove_board(struct slot *p_slot)
351{
352 struct controller *ctrl = p_slot->ctrl;
353 u8 hp_slot;
354 int rc;
355
356 if (shpchp_unconfigure_device(p_slot))
357 return(1);
358
359 hp_slot = p_slot->device - ctrl->slot_device_offset;
360 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
361
362 ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
363
364 /* Change status to shutdown */
365 if (p_slot->is_a_board)
366 p_slot->status = 0x01;
367
368 /* turn off slot, turn on Amber LED, turn off Green LED */
369 rc = p_slot->hpc_ops->slot_disable(p_slot);
370 if (rc) {
371 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
372 __func__);
373 return rc;
374 }
375
376 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
377 if (rc) {
378 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
379 return rc;
380 }
381
382 p_slot->pwr_save = 0;
383 p_slot->is_a_board = 0;
384
385 return 0;
386}
387
388
389struct pushbutton_work_info {
390 struct slot *p_slot;
391 struct work_struct work;
392};
393
394/**
395 * shpchp_pushbutton_thread - handle pushbutton events
396 * @work: &struct work_struct to be handled
397 *
398 * Scheduled procedure to handle blocking stuff for the pushbuttons.
399 * Handles all pending events and exits.
400 */
401static void shpchp_pushbutton_thread(struct work_struct *work)
402{
403 struct pushbutton_work_info *info =
404 container_of(work, struct pushbutton_work_info, work);
405 struct slot *p_slot = info->p_slot;
406
407 mutex_lock(&p_slot->lock);
408 switch (p_slot->state) {
409 case POWEROFF_STATE:
410 mutex_unlock(&p_slot->lock);
411 shpchp_disable_slot(p_slot);
412 mutex_lock(&p_slot->lock);
413 p_slot->state = STATIC_STATE;
414 break;
415 case POWERON_STATE:
416 mutex_unlock(&p_slot->lock);
417 if (shpchp_enable_slot(p_slot))
418 p_slot->hpc_ops->green_led_off(p_slot);
419 mutex_lock(&p_slot->lock);
420 p_slot->state = STATIC_STATE;
421 break;
422 default:
423 break;
424 }
425 mutex_unlock(&p_slot->lock);
426
427 kfree(info);
428}
429
430void shpchp_queue_pushbutton_work(struct work_struct *work)
431{
432 struct slot *p_slot = container_of(work, struct slot, work.work);
433 struct pushbutton_work_info *info;
434
435 info = kmalloc(sizeof(*info), GFP_KERNEL);
436 if (!info) {
437 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
438 __func__);
439 return;
440 }
441 info->p_slot = p_slot;
442 INIT_WORK(&info->work, shpchp_pushbutton_thread);
443
444 mutex_lock(&p_slot->lock);
445 switch (p_slot->state) {
446 case BLINKINGOFF_STATE:
447 p_slot->state = POWEROFF_STATE;
448 break;
449 case BLINKINGON_STATE:
450 p_slot->state = POWERON_STATE;
451 break;
452 default:
453 kfree(info);
454 goto out;
455 }
456 queue_work(p_slot->wq, &info->work);
457 out:
458 mutex_unlock(&p_slot->lock);
459}
460
461static int update_slot_info (struct slot *slot)
462{
463 struct hotplug_slot_info *info;
464 int result;
465
466 info = kmalloc(sizeof(*info), GFP_KERNEL);
467 if (!info)
468 return -ENOMEM;
469
470 slot->hpc_ops->get_power_status(slot, &(info->power_status));
471 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
472 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
473 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
474
475 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
476 kfree (info);
477 return result;
478}
479
480/*
481 * Note: This function must be called with slot->lock held
482 */
483static void handle_button_press_event(struct slot *p_slot)
484{
485 u8 getstatus;
486 struct controller *ctrl = p_slot->ctrl;
487
488 switch (p_slot->state) {
489 case STATIC_STATE:
490 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
491 if (getstatus) {
492 p_slot->state = BLINKINGOFF_STATE;
493 ctrl_info(ctrl, "PCI slot #%s - powering off due to "
494 "button press.\n", slot_name(p_slot));
495 } else {
496 p_slot->state = BLINKINGON_STATE;
497 ctrl_info(ctrl, "PCI slot #%s - powering on due to "
498 "button press.\n", slot_name(p_slot));
499 }
500 /* blink green LED and turn off amber */
501 p_slot->hpc_ops->green_led_blink(p_slot);
502 p_slot->hpc_ops->set_attention_status(p_slot, 0);
503
504 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
505 break;
506 case BLINKINGOFF_STATE:
507 case BLINKINGON_STATE:
508 /*
509 * Cancel if we are still blinking; this means that we
510 * press the attention again before the 5 sec. limit
511 * expires to cancel hot-add or hot-remove
512 */
513 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
514 slot_name(p_slot));
515 cancel_delayed_work(&p_slot->work);
516 if (p_slot->state == BLINKINGOFF_STATE)
517 p_slot->hpc_ops->green_led_on(p_slot);
518 else
519 p_slot->hpc_ops->green_led_off(p_slot);
520 p_slot->hpc_ops->set_attention_status(p_slot, 0);
521 ctrl_info(ctrl, "PCI slot #%s - action canceled due to "
522 "button press\n", slot_name(p_slot));
523 p_slot->state = STATIC_STATE;
524 break;
525 case POWEROFF_STATE:
526 case POWERON_STATE:
527 /*
528 * Ignore if the slot is on power-on or power-off state;
529 * this means that the previous attention button action
530 * to hot-add or hot-remove is undergoing
531 */
532 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
533 slot_name(p_slot));
534 update_slot_info(p_slot);
535 break;
536 default:
537 ctrl_warn(ctrl, "Not a valid state\n");
538 break;
539 }
540}
541
542static void interrupt_event_handler(struct work_struct *work)
543{
544 struct event_info *info = container_of(work, struct event_info, work);
545 struct slot *p_slot = info->p_slot;
546
547 mutex_lock(&p_slot->lock);
548 switch (info->event_type) {
549 case INT_BUTTON_PRESS:
550 handle_button_press_event(p_slot);
551 break;
552 case INT_POWER_FAULT:
553 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
554 p_slot->hpc_ops->set_attention_status(p_slot, 1);
555 p_slot->hpc_ops->green_led_off(p_slot);
556 break;
557 default:
558 update_slot_info(p_slot);
559 break;
560 }
561 mutex_unlock(&p_slot->lock);
562
563 kfree(info);
564}
565
566
567static int shpchp_enable_slot (struct slot *p_slot)
568{
569 u8 getstatus = 0;
570 int rc, retval = -ENODEV;
571 struct controller *ctrl = p_slot->ctrl;
572
573 /* Check to see if (latch closed, card present, power off) */
574 mutex_lock(&p_slot->ctrl->crit_sect);
575 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
576 if (rc || !getstatus) {
577 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
578 goto out;
579 }
580 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
581 if (rc || getstatus) {
582 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
583 goto out;
584 }
585 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
586 if (rc || getstatus) {
587 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
588 slot_name(p_slot));
589 goto out;
590 }
591
592 p_slot->is_a_board = 1;
593
594 /* We have to save the presence info for these slots */
595 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
596 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
597 ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
598 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
599
600 if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
601 (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
602 && p_slot->ctrl->num_slots == 1) {
603 /* handle amd pogo errata; this must be done before enable */
604 amd_pogo_errata_save_misc_reg(p_slot);
605 retval = board_added(p_slot);
606 /* handle amd pogo errata; this must be done after enable */
607 amd_pogo_errata_restore_misc_reg(p_slot);
608 } else
609 retval = board_added(p_slot);
610
611 if (retval) {
612 p_slot->hpc_ops->get_adapter_status(p_slot,
613 &(p_slot->presence_save));
614 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
615 }
616
617 update_slot_info(p_slot);
618 out:
619 mutex_unlock(&p_slot->ctrl->crit_sect);
620 return retval;
621}
622
623
624static int shpchp_disable_slot (struct slot *p_slot)
625{
626 u8 getstatus = 0;
627 int rc, retval = -ENODEV;
628 struct controller *ctrl = p_slot->ctrl;
629
630 if (!p_slot->ctrl)
631 return -ENODEV;
632
633 /* Check to see if (latch closed, card present, power on) */
634 mutex_lock(&p_slot->ctrl->crit_sect);
635
636 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
637 if (rc || !getstatus) {
638 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
639 goto out;
640 }
641 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
642 if (rc || getstatus) {
643 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
644 goto out;
645 }
646 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
647 if (rc || !getstatus) {
648 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
649 slot_name(p_slot));
650 goto out;
651 }
652
653 retval = remove_board(p_slot);
654 update_slot_info(p_slot);
655 out:
656 mutex_unlock(&p_slot->ctrl->crit_sect);
657 return retval;
658}
659
660int shpchp_sysfs_enable_slot(struct slot *p_slot)
661{
662 int retval = -ENODEV;
663 struct controller *ctrl = p_slot->ctrl;
664
665 mutex_lock(&p_slot->lock);
666 switch (p_slot->state) {
667 case BLINKINGON_STATE:
668 cancel_delayed_work(&p_slot->work);
669 case STATIC_STATE:
670 p_slot->state = POWERON_STATE;
671 mutex_unlock(&p_slot->lock);
672 retval = shpchp_enable_slot(p_slot);
673 mutex_lock(&p_slot->lock);
674 p_slot->state = STATIC_STATE;
675 break;
676 case POWERON_STATE:
677 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
678 slot_name(p_slot));
679 break;
680 case BLINKINGOFF_STATE:
681 case POWEROFF_STATE:
682 ctrl_info(ctrl, "Already enabled on slot %s\n",
683 slot_name(p_slot));
684 break;
685 default:
686 ctrl_err(ctrl, "Not a valid state on slot %s\n",
687 slot_name(p_slot));
688 break;
689 }
690 mutex_unlock(&p_slot->lock);
691
692 return retval;
693}
694
695int shpchp_sysfs_disable_slot(struct slot *p_slot)
696{
697 int retval = -ENODEV;
698 struct controller *ctrl = p_slot->ctrl;
699
700 mutex_lock(&p_slot->lock);
701 switch (p_slot->state) {
702 case BLINKINGOFF_STATE:
703 cancel_delayed_work(&p_slot->work);
704 case STATIC_STATE:
705 p_slot->state = POWEROFF_STATE;
706 mutex_unlock(&p_slot->lock);
707 retval = shpchp_disable_slot(p_slot);
708 mutex_lock(&p_slot->lock);
709 p_slot->state = STATIC_STATE;
710 break;
711 case POWEROFF_STATE:
712 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
713 slot_name(p_slot));
714 break;
715 case BLINKINGON_STATE:
716 case POWERON_STATE:
717 ctrl_info(ctrl, "Already disabled on slot %s\n",
718 slot_name(p_slot));
719 break;
720 default:
721 ctrl_err(ctrl, "Not a valid state on slot %s\n",
722 slot_name(p_slot));
723 break;
724 }
725 mutex_unlock(&p_slot->lock);
726
727 return retval;
728}