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1/*
2 * PCI Express 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 "pciehp.h"
37
38static void interrupt_event_handler(struct work_struct *work);
39
40static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
41{
42 struct event_info *info;
43
44 info = kmalloc(sizeof(*info), GFP_ATOMIC);
45 if (!info)
46 return -ENOMEM;
47
48 info->event_type = event_type;
49 info->p_slot = p_slot;
50 INIT_WORK(&info->work, interrupt_event_handler);
51
52 queue_work(pciehp_wq, &info->work);
53
54 return 0;
55}
56
57u8 pciehp_handle_attention_button(struct slot *p_slot)
58{
59 u32 event_type;
60 struct controller *ctrl = p_slot->ctrl;
61
62 /* Attention Button Change */
63 ctrl_dbg(ctrl, "Attention button interrupt received\n");
64
65 /*
66 * Button pressed - See if need to TAKE ACTION!!!
67 */
68 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
69 event_type = INT_BUTTON_PRESS;
70
71 queue_interrupt_event(p_slot, event_type);
72
73 return 0;
74}
75
76u8 pciehp_handle_switch_change(struct slot *p_slot)
77{
78 u8 getstatus;
79 u32 event_type;
80 struct controller *ctrl = p_slot->ctrl;
81
82 /* Switch Change */
83 ctrl_dbg(ctrl, "Switch interrupt received\n");
84
85 pciehp_get_latch_status(p_slot, &getstatus);
86 if (getstatus) {
87 /*
88 * Switch opened
89 */
90 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
91 event_type = INT_SWITCH_OPEN;
92 } else {
93 /*
94 * Switch closed
95 */
96 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
97 event_type = INT_SWITCH_CLOSE;
98 }
99
100 queue_interrupt_event(p_slot, event_type);
101
102 return 1;
103}
104
105u8 pciehp_handle_presence_change(struct slot *p_slot)
106{
107 u32 event_type;
108 u8 presence_save;
109 struct controller *ctrl = p_slot->ctrl;
110
111 /* Presence Change */
112 ctrl_dbg(ctrl, "Presence/Notify input change\n");
113
114 /* Switch is open, assume a presence change
115 * Save the presence state
116 */
117 pciehp_get_adapter_status(p_slot, &presence_save);
118 if (presence_save) {
119 /*
120 * Card Present
121 */
122 ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
123 event_type = INT_PRESENCE_ON;
124 } else {
125 /*
126 * Not Present
127 */
128 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
129 slot_name(p_slot));
130 event_type = INT_PRESENCE_OFF;
131 }
132
133 queue_interrupt_event(p_slot, event_type);
134
135 return 1;
136}
137
138u8 pciehp_handle_power_fault(struct slot *p_slot)
139{
140 u32 event_type;
141 struct controller *ctrl = p_slot->ctrl;
142
143 /* power fault */
144 ctrl_dbg(ctrl, "Power fault interrupt received\n");
145 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
146 event_type = INT_POWER_FAULT;
147 ctrl_info(ctrl, "Power fault bit %x set\n", 0);
148 queue_interrupt_event(p_slot, event_type);
149
150 return 1;
151}
152
153/* The following routines constitute the bulk of the
154 hotplug controller logic
155 */
156
157static void set_slot_off(struct controller *ctrl, struct slot * pslot)
158{
159 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
160 if (POWER_CTRL(ctrl)) {
161 if (pciehp_power_off_slot(pslot)) {
162 ctrl_err(ctrl,
163 "Issue of Slot Power Off command failed\n");
164 return;
165 }
166 /*
167 * After turning power off, we must wait for at least 1 second
168 * before taking any action that relies on power having been
169 * removed from the slot/adapter.
170 */
171 msleep(1000);
172 }
173
174 if (PWR_LED(ctrl))
175 pciehp_green_led_off(pslot);
176
177 if (ATTN_LED(ctrl)) {
178 if (pciehp_set_attention_status(pslot, 1)) {
179 ctrl_err(ctrl,
180 "Issue of Set Attention Led command failed\n");
181 return;
182 }
183 }
184}
185
186/**
187 * board_added - Called after a board has been added to the system.
188 * @p_slot: &slot where board is added
189 *
190 * Turns power on for the board.
191 * Configures board.
192 */
193static int board_added(struct slot *p_slot)
194{
195 int retval = 0;
196 struct controller *ctrl = p_slot->ctrl;
197 struct pci_bus *parent = ctrl->pcie->port->subordinate;
198
199 if (POWER_CTRL(ctrl)) {
200 /* Power on slot */
201 retval = pciehp_power_on_slot(p_slot);
202 if (retval)
203 return retval;
204 }
205
206 if (PWR_LED(ctrl))
207 pciehp_green_led_blink(p_slot);
208
209 /* Check link training status */
210 retval = pciehp_check_link_status(ctrl);
211 if (retval) {
212 ctrl_err(ctrl, "Failed to check link status\n");
213 goto err_exit;
214 }
215
216 /* Wait for 1 second after checking link training status */
217 msleep(1000);
218
219 /* Check for a power fault */
220 if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
221 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
222 retval = -EIO;
223 goto err_exit;
224 }
225
226 retval = pciehp_configure_device(p_slot);
227 if (retval) {
228 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
229 pci_domain_nr(parent), parent->number);
230 goto err_exit;
231 }
232
233 if (PWR_LED(ctrl))
234 pciehp_green_led_on(p_slot);
235
236 return 0;
237
238err_exit:
239 set_slot_off(ctrl, p_slot);
240 return retval;
241}
242
243/**
244 * remove_board - Turns off slot and LEDs
245 * @p_slot: slot where board is being removed
246 */
247static int remove_board(struct slot *p_slot)
248{
249 int retval = 0;
250 struct controller *ctrl = p_slot->ctrl;
251
252 retval = pciehp_unconfigure_device(p_slot);
253 if (retval)
254 return retval;
255
256 if (POWER_CTRL(ctrl)) {
257 /* power off slot */
258 retval = pciehp_power_off_slot(p_slot);
259 if (retval) {
260 ctrl_err(ctrl,
261 "Issue of Slot Disable command failed\n");
262 return retval;
263 }
264 /*
265 * After turning power off, we must wait for at least 1 second
266 * before taking any action that relies on power having been
267 * removed from the slot/adapter.
268 */
269 msleep(1000);
270 }
271
272 /* turn off Green LED */
273 if (PWR_LED(ctrl))
274 pciehp_green_led_off(p_slot);
275
276 return 0;
277}
278
279struct power_work_info {
280 struct slot *p_slot;
281 struct work_struct work;
282};
283
284/**
285 * pciehp_power_thread - handle pushbutton events
286 * @work: &struct work_struct describing work to be done
287 *
288 * Scheduled procedure to handle blocking stuff for the pushbuttons.
289 * Handles all pending events and exits.
290 */
291static void pciehp_power_thread(struct work_struct *work)
292{
293 struct power_work_info *info =
294 container_of(work, struct power_work_info, work);
295 struct slot *p_slot = info->p_slot;
296
297 mutex_lock(&p_slot->lock);
298 switch (p_slot->state) {
299 case POWEROFF_STATE:
300 mutex_unlock(&p_slot->lock);
301 ctrl_dbg(p_slot->ctrl,
302 "Disabling domain:bus:device=%04x:%02x:00\n",
303 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
304 p_slot->ctrl->pcie->port->subordinate->number);
305 pciehp_disable_slot(p_slot);
306 mutex_lock(&p_slot->lock);
307 p_slot->state = STATIC_STATE;
308 break;
309 case POWERON_STATE:
310 mutex_unlock(&p_slot->lock);
311 if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
312 pciehp_green_led_off(p_slot);
313 mutex_lock(&p_slot->lock);
314 p_slot->state = STATIC_STATE;
315 break;
316 default:
317 break;
318 }
319 mutex_unlock(&p_slot->lock);
320
321 kfree(info);
322}
323
324void pciehp_queue_pushbutton_work(struct work_struct *work)
325{
326 struct slot *p_slot = container_of(work, struct slot, work.work);
327 struct power_work_info *info;
328
329 info = kmalloc(sizeof(*info), GFP_KERNEL);
330 if (!info) {
331 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
332 __func__);
333 return;
334 }
335 info->p_slot = p_slot;
336 INIT_WORK(&info->work, pciehp_power_thread);
337
338 mutex_lock(&p_slot->lock);
339 switch (p_slot->state) {
340 case BLINKINGOFF_STATE:
341 p_slot->state = POWEROFF_STATE;
342 break;
343 case BLINKINGON_STATE:
344 p_slot->state = POWERON_STATE;
345 break;
346 default:
347 kfree(info);
348 goto out;
349 }
350 queue_work(pciehp_ordered_wq, &info->work);
351 out:
352 mutex_unlock(&p_slot->lock);
353}
354
355/*
356 * Note: This function must be called with slot->lock held
357 */
358static void handle_button_press_event(struct slot *p_slot)
359{
360 struct controller *ctrl = p_slot->ctrl;
361 u8 getstatus;
362
363 switch (p_slot->state) {
364 case STATIC_STATE:
365 pciehp_get_power_status(p_slot, &getstatus);
366 if (getstatus) {
367 p_slot->state = BLINKINGOFF_STATE;
368 ctrl_info(ctrl,
369 "PCI slot #%s - powering off due to button "
370 "press.\n", slot_name(p_slot));
371 } else {
372 p_slot->state = BLINKINGON_STATE;
373 ctrl_info(ctrl,
374 "PCI slot #%s - powering on due to button "
375 "press.\n", slot_name(p_slot));
376 }
377 /* blink green LED and turn off amber */
378 if (PWR_LED(ctrl))
379 pciehp_green_led_blink(p_slot);
380 if (ATTN_LED(ctrl))
381 pciehp_set_attention_status(p_slot, 0);
382
383 queue_delayed_work(pciehp_wq, &p_slot->work, 5*HZ);
384 break;
385 case BLINKINGOFF_STATE:
386 case BLINKINGON_STATE:
387 /*
388 * Cancel if we are still blinking; this means that we
389 * press the attention again before the 5 sec. limit
390 * expires to cancel hot-add or hot-remove
391 */
392 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
393 cancel_delayed_work(&p_slot->work);
394 if (p_slot->state == BLINKINGOFF_STATE) {
395 if (PWR_LED(ctrl))
396 pciehp_green_led_on(p_slot);
397 } else {
398 if (PWR_LED(ctrl))
399 pciehp_green_led_off(p_slot);
400 }
401 if (ATTN_LED(ctrl))
402 pciehp_set_attention_status(p_slot, 0);
403 ctrl_info(ctrl, "PCI slot #%s - action canceled "
404 "due to button press\n", slot_name(p_slot));
405 p_slot->state = STATIC_STATE;
406 break;
407 case POWEROFF_STATE:
408 case POWERON_STATE:
409 /*
410 * Ignore if the slot is on power-on or power-off state;
411 * this means that the previous attention button action
412 * to hot-add or hot-remove is undergoing
413 */
414 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
415 break;
416 default:
417 ctrl_warn(ctrl, "Not a valid state\n");
418 break;
419 }
420}
421
422/*
423 * Note: This function must be called with slot->lock held
424 */
425static void handle_surprise_event(struct slot *p_slot)
426{
427 u8 getstatus;
428 struct power_work_info *info;
429
430 info = kmalloc(sizeof(*info), GFP_KERNEL);
431 if (!info) {
432 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
433 __func__);
434 return;
435 }
436 info->p_slot = p_slot;
437 INIT_WORK(&info->work, pciehp_power_thread);
438
439 pciehp_get_adapter_status(p_slot, &getstatus);
440 if (!getstatus)
441 p_slot->state = POWEROFF_STATE;
442 else
443 p_slot->state = POWERON_STATE;
444
445 queue_work(pciehp_ordered_wq, &info->work);
446}
447
448static void interrupt_event_handler(struct work_struct *work)
449{
450 struct event_info *info = container_of(work, struct event_info, work);
451 struct slot *p_slot = info->p_slot;
452 struct controller *ctrl = p_slot->ctrl;
453
454 mutex_lock(&p_slot->lock);
455 switch (info->event_type) {
456 case INT_BUTTON_PRESS:
457 handle_button_press_event(p_slot);
458 break;
459 case INT_POWER_FAULT:
460 if (!POWER_CTRL(ctrl))
461 break;
462 if (ATTN_LED(ctrl))
463 pciehp_set_attention_status(p_slot, 1);
464 if (PWR_LED(ctrl))
465 pciehp_green_led_off(p_slot);
466 break;
467 case INT_PRESENCE_ON:
468 case INT_PRESENCE_OFF:
469 if (!HP_SUPR_RM(ctrl))
470 break;
471 ctrl_dbg(ctrl, "Surprise Removal\n");
472 handle_surprise_event(p_slot);
473 break;
474 default:
475 break;
476 }
477 mutex_unlock(&p_slot->lock);
478
479 kfree(info);
480}
481
482int pciehp_enable_slot(struct slot *p_slot)
483{
484 u8 getstatus = 0;
485 int rc;
486 struct controller *ctrl = p_slot->ctrl;
487
488 rc = pciehp_get_adapter_status(p_slot, &getstatus);
489 if (rc || !getstatus) {
490 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
491 return -ENODEV;
492 }
493 if (MRL_SENS(p_slot->ctrl)) {
494 rc = pciehp_get_latch_status(p_slot, &getstatus);
495 if (rc || getstatus) {
496 ctrl_info(ctrl, "Latch open on slot(%s)\n",
497 slot_name(p_slot));
498 return -ENODEV;
499 }
500 }
501
502 if (POWER_CTRL(p_slot->ctrl)) {
503 rc = pciehp_get_power_status(p_slot, &getstatus);
504 if (rc || getstatus) {
505 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
506 slot_name(p_slot));
507 return -EINVAL;
508 }
509 }
510
511 pciehp_get_latch_status(p_slot, &getstatus);
512
513 rc = board_added(p_slot);
514 if (rc) {
515 pciehp_get_latch_status(p_slot, &getstatus);
516 }
517 return rc;
518}
519
520
521int pciehp_disable_slot(struct slot *p_slot)
522{
523 u8 getstatus = 0;
524 int ret = 0;
525 struct controller *ctrl = p_slot->ctrl;
526
527 if (!p_slot->ctrl)
528 return 1;
529
530 if (!HP_SUPR_RM(p_slot->ctrl)) {
531 ret = pciehp_get_adapter_status(p_slot, &getstatus);
532 if (ret || !getstatus) {
533 ctrl_info(ctrl, "No adapter on slot(%s)\n",
534 slot_name(p_slot));
535 return -ENODEV;
536 }
537 }
538
539 if (MRL_SENS(p_slot->ctrl)) {
540 ret = pciehp_get_latch_status(p_slot, &getstatus);
541 if (ret || getstatus) {
542 ctrl_info(ctrl, "Latch open on slot(%s)\n",
543 slot_name(p_slot));
544 return -ENODEV;
545 }
546 }
547
548 if (POWER_CTRL(p_slot->ctrl)) {
549 ret = pciehp_get_power_status(p_slot, &getstatus);
550 if (ret || !getstatus) {
551 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
552 slot_name(p_slot));
553 return -EINVAL;
554 }
555 }
556
557 return remove_board(p_slot);
558}
559
560int pciehp_sysfs_enable_slot(struct slot *p_slot)
561{
562 int retval = -ENODEV;
563 struct controller *ctrl = p_slot->ctrl;
564
565 mutex_lock(&p_slot->lock);
566 switch (p_slot->state) {
567 case BLINKINGON_STATE:
568 cancel_delayed_work(&p_slot->work);
569 case STATIC_STATE:
570 p_slot->state = POWERON_STATE;
571 mutex_unlock(&p_slot->lock);
572 retval = pciehp_enable_slot(p_slot);
573 mutex_lock(&p_slot->lock);
574 p_slot->state = STATIC_STATE;
575 break;
576 case POWERON_STATE:
577 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
578 slot_name(p_slot));
579 break;
580 case BLINKINGOFF_STATE:
581 case POWEROFF_STATE:
582 ctrl_info(ctrl, "Already enabled on slot %s\n",
583 slot_name(p_slot));
584 break;
585 default:
586 ctrl_err(ctrl, "Not a valid state on slot %s\n",
587 slot_name(p_slot));
588 break;
589 }
590 mutex_unlock(&p_slot->lock);
591
592 return retval;
593}
594
595int pciehp_sysfs_disable_slot(struct slot *p_slot)
596{
597 int retval = -ENODEV;
598 struct controller *ctrl = p_slot->ctrl;
599
600 mutex_lock(&p_slot->lock);
601 switch (p_slot->state) {
602 case BLINKINGOFF_STATE:
603 cancel_delayed_work(&p_slot->work);
604 case STATIC_STATE:
605 p_slot->state = POWEROFF_STATE;
606 mutex_unlock(&p_slot->lock);
607 retval = pciehp_disable_slot(p_slot);
608 mutex_lock(&p_slot->lock);
609 p_slot->state = STATIC_STATE;
610 break;
611 case POWEROFF_STATE:
612 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
613 slot_name(p_slot));
614 break;
615 case BLINKINGON_STATE:
616 case POWERON_STATE:
617 ctrl_info(ctrl, "Already disabled on slot %s\n",
618 slot_name(p_slot));
619 break;
620 default:
621 ctrl_err(ctrl, "Not a valid state on slot %s\n",
622 slot_name(p_slot));
623 break;
624 }
625 mutex_unlock(&p_slot->lock);
626
627 return retval;
628}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Express 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#define dev_fmt(fmt) "pciehp: " fmt
17
18#include <linux/kernel.h>
19#include <linux/types.h>
20#include <linux/pm_runtime.h>
21#include <linux/pci.h>
22#include "pciehp.h"
23
24/* The following routines constitute the bulk of the
25 hotplug controller logic
26 */
27
28#define SAFE_REMOVAL true
29#define SURPRISE_REMOVAL false
30
31static void set_slot_off(struct controller *ctrl)
32{
33 /*
34 * Turn off slot, turn on attention indicator, turn off power
35 * indicator
36 */
37 if (POWER_CTRL(ctrl)) {
38 pciehp_power_off_slot(ctrl);
39
40 /*
41 * After turning power off, we must wait for at least 1 second
42 * before taking any action that relies on power having been
43 * removed from the slot/adapter.
44 */
45 msleep(1000);
46 }
47
48 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
49 PCI_EXP_SLTCTL_ATTN_IND_ON);
50}
51
52/**
53 * board_added - Called after a board has been added to the system.
54 * @ctrl: PCIe hotplug controller where board is added
55 *
56 * Turns power on for the board.
57 * Configures board.
58 */
59static int board_added(struct controller *ctrl)
60{
61 int retval = 0;
62 struct pci_bus *parent = ctrl->pcie->port->subordinate;
63
64 if (POWER_CTRL(ctrl)) {
65 /* Power on slot */
66 retval = pciehp_power_on_slot(ctrl);
67 if (retval)
68 return retval;
69 }
70
71 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
72 INDICATOR_NOOP);
73
74 /* Check link training status */
75 retval = pciehp_check_link_status(ctrl);
76 if (retval)
77 goto err_exit;
78
79 /* Check for a power fault */
80 if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
81 ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
82 retval = -EIO;
83 goto err_exit;
84 }
85
86 retval = pciehp_configure_device(ctrl);
87 if (retval) {
88 if (retval != -EEXIST) {
89 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
90 pci_domain_nr(parent), parent->number);
91 goto err_exit;
92 }
93 }
94
95 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
96 PCI_EXP_SLTCTL_ATTN_IND_OFF);
97 return 0;
98
99err_exit:
100 set_slot_off(ctrl);
101 return retval;
102}
103
104/**
105 * remove_board - Turn off slot and Power Indicator
106 * @ctrl: PCIe hotplug controller where board is being removed
107 * @safe_removal: whether the board is safely removed (versus surprise removed)
108 */
109static void remove_board(struct controller *ctrl, bool safe_removal)
110{
111 pciehp_unconfigure_device(ctrl, safe_removal);
112
113 if (POWER_CTRL(ctrl)) {
114 pciehp_power_off_slot(ctrl);
115
116 /*
117 * After turning power off, we must wait for at least 1 second
118 * before taking any action that relies on power having been
119 * removed from the slot/adapter.
120 */
121 msleep(1000);
122
123 /* Ignore link or presence changes caused by power off */
124 atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
125 &ctrl->pending_events);
126 }
127
128 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
129 INDICATOR_NOOP);
130}
131
132static int pciehp_enable_slot(struct controller *ctrl);
133static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
134
135void pciehp_request(struct controller *ctrl, int action)
136{
137 atomic_or(action, &ctrl->pending_events);
138 if (!pciehp_poll_mode)
139 irq_wake_thread(ctrl->pcie->irq, ctrl);
140}
141
142void pciehp_queue_pushbutton_work(struct work_struct *work)
143{
144 struct controller *ctrl = container_of(work, struct controller,
145 button_work.work);
146
147 mutex_lock(&ctrl->state_lock);
148 switch (ctrl->state) {
149 case BLINKINGOFF_STATE:
150 pciehp_request(ctrl, DISABLE_SLOT);
151 break;
152 case BLINKINGON_STATE:
153 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
154 break;
155 default:
156 break;
157 }
158 mutex_unlock(&ctrl->state_lock);
159}
160
161void pciehp_handle_button_press(struct controller *ctrl)
162{
163 mutex_lock(&ctrl->state_lock);
164 switch (ctrl->state) {
165 case OFF_STATE:
166 case ON_STATE:
167 if (ctrl->state == ON_STATE) {
168 ctrl->state = BLINKINGOFF_STATE;
169 ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
170 slot_name(ctrl));
171 } else {
172 ctrl->state = BLINKINGON_STATE;
173 ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
174 slot_name(ctrl));
175 }
176 /* blink power indicator and turn off attention */
177 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
178 PCI_EXP_SLTCTL_ATTN_IND_OFF);
179 schedule_delayed_work(&ctrl->button_work, 5 * HZ);
180 break;
181 case BLINKINGOFF_STATE:
182 case BLINKINGON_STATE:
183 /*
184 * Cancel if we are still blinking; this means that we
185 * press the attention again before the 5 sec. limit
186 * expires to cancel hot-add or hot-remove
187 */
188 ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl));
189 cancel_delayed_work(&ctrl->button_work);
190 if (ctrl->state == BLINKINGOFF_STATE) {
191 ctrl->state = ON_STATE;
192 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
193 PCI_EXP_SLTCTL_ATTN_IND_OFF);
194 } else {
195 ctrl->state = OFF_STATE;
196 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
197 PCI_EXP_SLTCTL_ATTN_IND_OFF);
198 }
199 ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
200 slot_name(ctrl));
201 break;
202 default:
203 ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
204 slot_name(ctrl), ctrl->state);
205 break;
206 }
207 mutex_unlock(&ctrl->state_lock);
208}
209
210void pciehp_handle_disable_request(struct controller *ctrl)
211{
212 mutex_lock(&ctrl->state_lock);
213 switch (ctrl->state) {
214 case BLINKINGON_STATE:
215 case BLINKINGOFF_STATE:
216 cancel_delayed_work(&ctrl->button_work);
217 break;
218 }
219 ctrl->state = POWEROFF_STATE;
220 mutex_unlock(&ctrl->state_lock);
221
222 ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
223}
224
225void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
226{
227 int present, link_active;
228
229 /*
230 * If the slot is on and presence or link has changed, turn it off.
231 * Even if it's occupied again, we cannot assume the card is the same.
232 */
233 mutex_lock(&ctrl->state_lock);
234 switch (ctrl->state) {
235 case BLINKINGOFF_STATE:
236 cancel_delayed_work(&ctrl->button_work);
237 fallthrough;
238 case ON_STATE:
239 ctrl->state = POWEROFF_STATE;
240 mutex_unlock(&ctrl->state_lock);
241 if (events & PCI_EXP_SLTSTA_DLLSC)
242 ctrl_info(ctrl, "Slot(%s): Link Down\n",
243 slot_name(ctrl));
244 if (events & PCI_EXP_SLTSTA_PDC)
245 ctrl_info(ctrl, "Slot(%s): Card not present\n",
246 slot_name(ctrl));
247 pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
248 break;
249 default:
250 mutex_unlock(&ctrl->state_lock);
251 break;
252 }
253
254 /* Turn the slot on if it's occupied or link is up */
255 mutex_lock(&ctrl->state_lock);
256 present = pciehp_card_present(ctrl);
257 link_active = pciehp_check_link_active(ctrl);
258 if (present <= 0 && link_active <= 0) {
259 mutex_unlock(&ctrl->state_lock);
260 return;
261 }
262
263 switch (ctrl->state) {
264 case BLINKINGON_STATE:
265 cancel_delayed_work(&ctrl->button_work);
266 fallthrough;
267 case OFF_STATE:
268 ctrl->state = POWERON_STATE;
269 mutex_unlock(&ctrl->state_lock);
270 if (present)
271 ctrl_info(ctrl, "Slot(%s): Card present\n",
272 slot_name(ctrl));
273 if (link_active)
274 ctrl_info(ctrl, "Slot(%s): Link Up\n",
275 slot_name(ctrl));
276 ctrl->request_result = pciehp_enable_slot(ctrl);
277 break;
278 default:
279 mutex_unlock(&ctrl->state_lock);
280 break;
281 }
282}
283
284static int __pciehp_enable_slot(struct controller *ctrl)
285{
286 u8 getstatus = 0;
287
288 if (MRL_SENS(ctrl)) {
289 pciehp_get_latch_status(ctrl, &getstatus);
290 if (getstatus) {
291 ctrl_info(ctrl, "Slot(%s): Latch open\n",
292 slot_name(ctrl));
293 return -ENODEV;
294 }
295 }
296
297 if (POWER_CTRL(ctrl)) {
298 pciehp_get_power_status(ctrl, &getstatus);
299 if (getstatus) {
300 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
301 slot_name(ctrl));
302 return 0;
303 }
304 }
305
306 return board_added(ctrl);
307}
308
309static int pciehp_enable_slot(struct controller *ctrl)
310{
311 int ret;
312
313 pm_runtime_get_sync(&ctrl->pcie->port->dev);
314 ret = __pciehp_enable_slot(ctrl);
315 if (ret && ATTN_BUTTN(ctrl))
316 /* may be blinking */
317 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
318 INDICATOR_NOOP);
319 pm_runtime_put(&ctrl->pcie->port->dev);
320
321 mutex_lock(&ctrl->state_lock);
322 ctrl->state = ret ? OFF_STATE : ON_STATE;
323 mutex_unlock(&ctrl->state_lock);
324
325 return ret;
326}
327
328static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
329{
330 u8 getstatus = 0;
331
332 if (POWER_CTRL(ctrl)) {
333 pciehp_get_power_status(ctrl, &getstatus);
334 if (!getstatus) {
335 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
336 slot_name(ctrl));
337 return -EINVAL;
338 }
339 }
340
341 remove_board(ctrl, safe_removal);
342 return 0;
343}
344
345static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
346{
347 int ret;
348
349 pm_runtime_get_sync(&ctrl->pcie->port->dev);
350 ret = __pciehp_disable_slot(ctrl, safe_removal);
351 pm_runtime_put(&ctrl->pcie->port->dev);
352
353 mutex_lock(&ctrl->state_lock);
354 ctrl->state = OFF_STATE;
355 mutex_unlock(&ctrl->state_lock);
356
357 return ret;
358}
359
360int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
361{
362 struct controller *ctrl = to_ctrl(hotplug_slot);
363
364 mutex_lock(&ctrl->state_lock);
365 switch (ctrl->state) {
366 case BLINKINGON_STATE:
367 case OFF_STATE:
368 mutex_unlock(&ctrl->state_lock);
369 /*
370 * The IRQ thread becomes a no-op if the user pulls out the
371 * card before the thread wakes up, so initialize to -ENODEV.
372 */
373 ctrl->request_result = -ENODEV;
374 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
375 wait_event(ctrl->requester,
376 !atomic_read(&ctrl->pending_events) &&
377 !ctrl->ist_running);
378 return ctrl->request_result;
379 case POWERON_STATE:
380 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
381 slot_name(ctrl));
382 break;
383 case BLINKINGOFF_STATE:
384 case ON_STATE:
385 case POWEROFF_STATE:
386 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
387 slot_name(ctrl));
388 break;
389 default:
390 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
391 slot_name(ctrl), ctrl->state);
392 break;
393 }
394 mutex_unlock(&ctrl->state_lock);
395
396 return -ENODEV;
397}
398
399int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
400{
401 struct controller *ctrl = to_ctrl(hotplug_slot);
402
403 mutex_lock(&ctrl->state_lock);
404 switch (ctrl->state) {
405 case BLINKINGOFF_STATE:
406 case ON_STATE:
407 mutex_unlock(&ctrl->state_lock);
408 pciehp_request(ctrl, DISABLE_SLOT);
409 wait_event(ctrl->requester,
410 !atomic_read(&ctrl->pending_events) &&
411 !ctrl->ist_running);
412 return ctrl->request_result;
413 case POWEROFF_STATE:
414 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
415 slot_name(ctrl));
416 break;
417 case BLINKINGON_STATE:
418 case OFF_STATE:
419 case POWERON_STATE:
420 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
421 slot_name(ctrl));
422 break;
423 default:
424 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
425 slot_name(ctrl), ctrl->state);
426 break;
427 }
428 mutex_unlock(&ctrl->state_lock);
429
430 return -ENODEV;
431}