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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
23#include "../pci.h"
24#include "pciehp.h"
25
26/* The following routines constitute the bulk of the
27 hotplug controller logic
28 */
29
30#define SAFE_REMOVAL true
31#define SURPRISE_REMOVAL false
32
33static void set_slot_off(struct controller *ctrl)
34{
35 /*
36 * Turn off slot, turn on attention indicator, turn off power
37 * indicator
38 */
39 if (POWER_CTRL(ctrl)) {
40 pciehp_power_off_slot(ctrl);
41
42 /*
43 * After turning power off, we must wait for at least 1 second
44 * before taking any action that relies on power having been
45 * removed from the slot/adapter.
46 */
47 msleep(1000);
48 }
49
50 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
51 PCI_EXP_SLTCTL_ATTN_IND_ON);
52}
53
54/**
55 * board_added - Called after a board has been added to the system.
56 * @ctrl: PCIe hotplug controller where board is added
57 *
58 * Turns power on for the board.
59 * Configures board.
60 */
61static int board_added(struct controller *ctrl)
62{
63 int retval = 0;
64 struct pci_bus *parent = ctrl->pcie->port->subordinate;
65
66 if (POWER_CTRL(ctrl)) {
67 /* Power on slot */
68 retval = pciehp_power_on_slot(ctrl);
69 if (retval)
70 return retval;
71 }
72
73 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
74 INDICATOR_NOOP);
75
76 /* Check link training status */
77 retval = pciehp_check_link_status(ctrl);
78 if (retval)
79 goto err_exit;
80
81 /* Check for a power fault */
82 if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
83 ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
84 retval = -EIO;
85 goto err_exit;
86 }
87
88 retval = pciehp_configure_device(ctrl);
89 if (retval) {
90 if (retval != -EEXIST) {
91 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
92 pci_domain_nr(parent), parent->number);
93 goto err_exit;
94 }
95 }
96
97 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
98 PCI_EXP_SLTCTL_ATTN_IND_OFF);
99 return 0;
100
101err_exit:
102 set_slot_off(ctrl);
103 return retval;
104}
105
106/**
107 * remove_board - Turn off slot and Power Indicator
108 * @ctrl: PCIe hotplug controller where board is being removed
109 * @safe_removal: whether the board is safely removed (versus surprise removed)
110 */
111static void remove_board(struct controller *ctrl, bool safe_removal)
112{
113 pciehp_unconfigure_device(ctrl, safe_removal);
114
115 if (POWER_CTRL(ctrl)) {
116 pciehp_power_off_slot(ctrl);
117
118 /*
119 * After turning power off, we must wait for at least 1 second
120 * before taking any action that relies on power having been
121 * removed from the slot/adapter.
122 */
123 msleep(1000);
124
125 /* Ignore link or presence changes caused by power off */
126 atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
127 &ctrl->pending_events);
128 }
129
130 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
131 INDICATOR_NOOP);
132
133 /* Don't carry LBMS indications across */
134 pcie_reset_lbms_count(ctrl->pcie->port);
135}
136
137static int pciehp_enable_slot(struct controller *ctrl);
138static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
139
140void pciehp_request(struct controller *ctrl, int action)
141{
142 atomic_or(action, &ctrl->pending_events);
143 if (!pciehp_poll_mode)
144 irq_wake_thread(ctrl->pcie->irq, ctrl);
145}
146
147void pciehp_queue_pushbutton_work(struct work_struct *work)
148{
149 struct controller *ctrl = container_of(work, struct controller,
150 button_work.work);
151
152 mutex_lock(&ctrl->state_lock);
153 switch (ctrl->state) {
154 case BLINKINGOFF_STATE:
155 pciehp_request(ctrl, DISABLE_SLOT);
156 break;
157 case BLINKINGON_STATE:
158 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
159 break;
160 default:
161 break;
162 }
163 mutex_unlock(&ctrl->state_lock);
164}
165
166void pciehp_handle_button_press(struct controller *ctrl)
167{
168 mutex_lock(&ctrl->state_lock);
169 switch (ctrl->state) {
170 case OFF_STATE:
171 case ON_STATE:
172 if (ctrl->state == ON_STATE) {
173 ctrl->state = BLINKINGOFF_STATE;
174 ctrl_info(ctrl, "Slot(%s): Button press: will power off in 5 sec\n",
175 slot_name(ctrl));
176 } else {
177 ctrl->state = BLINKINGON_STATE;
178 ctrl_info(ctrl, "Slot(%s): Button press: will power on in 5 sec\n",
179 slot_name(ctrl));
180 }
181 /* blink power indicator and turn off attention */
182 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
183 PCI_EXP_SLTCTL_ATTN_IND_OFF);
184 schedule_delayed_work(&ctrl->button_work, 5 * HZ);
185 break;
186 case BLINKINGOFF_STATE:
187 case BLINKINGON_STATE:
188 /*
189 * Cancel if we are still blinking; this means that we
190 * press the attention again before the 5 sec. limit
191 * expires to cancel hot-add or hot-remove
192 */
193 cancel_delayed_work(&ctrl->button_work);
194 if (ctrl->state == BLINKINGOFF_STATE) {
195 ctrl->state = ON_STATE;
196 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
197 PCI_EXP_SLTCTL_ATTN_IND_OFF);
198 ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power off\n",
199 slot_name(ctrl));
200 } else {
201 ctrl->state = OFF_STATE;
202 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
203 PCI_EXP_SLTCTL_ATTN_IND_OFF);
204 ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power on\n",
205 slot_name(ctrl));
206 }
207 break;
208 default:
209 ctrl_err(ctrl, "Slot(%s): Button press: ignoring invalid state %#x\n",
210 slot_name(ctrl), ctrl->state);
211 break;
212 }
213 mutex_unlock(&ctrl->state_lock);
214}
215
216void pciehp_handle_disable_request(struct controller *ctrl)
217{
218 mutex_lock(&ctrl->state_lock);
219 switch (ctrl->state) {
220 case BLINKINGON_STATE:
221 case BLINKINGOFF_STATE:
222 cancel_delayed_work(&ctrl->button_work);
223 break;
224 }
225 ctrl->state = POWEROFF_STATE;
226 mutex_unlock(&ctrl->state_lock);
227
228 ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
229}
230
231void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
232{
233 int present, link_active;
234
235 /*
236 * If the slot is on and presence or link has changed, turn it off.
237 * Even if it's occupied again, we cannot assume the card is the same.
238 */
239 mutex_lock(&ctrl->state_lock);
240 switch (ctrl->state) {
241 case BLINKINGOFF_STATE:
242 cancel_delayed_work(&ctrl->button_work);
243 fallthrough;
244 case ON_STATE:
245 ctrl->state = POWEROFF_STATE;
246 mutex_unlock(&ctrl->state_lock);
247 if (events & PCI_EXP_SLTSTA_DLLSC)
248 ctrl_info(ctrl, "Slot(%s): Link Down\n",
249 slot_name(ctrl));
250 if (events & PCI_EXP_SLTSTA_PDC)
251 ctrl_info(ctrl, "Slot(%s): Card not present\n",
252 slot_name(ctrl));
253 pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
254 break;
255 default:
256 mutex_unlock(&ctrl->state_lock);
257 break;
258 }
259
260 /* Turn the slot on if it's occupied or link is up */
261 mutex_lock(&ctrl->state_lock);
262 present = pciehp_card_present(ctrl);
263 link_active = pciehp_check_link_active(ctrl);
264 if (present <= 0 && link_active <= 0) {
265 if (ctrl->state == BLINKINGON_STATE) {
266 ctrl->state = OFF_STATE;
267 cancel_delayed_work(&ctrl->button_work);
268 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
269 INDICATOR_NOOP);
270 ctrl_info(ctrl, "Slot(%s): Card not present\n",
271 slot_name(ctrl));
272 }
273 mutex_unlock(&ctrl->state_lock);
274 return;
275 }
276
277 switch (ctrl->state) {
278 case BLINKINGON_STATE:
279 cancel_delayed_work(&ctrl->button_work);
280 fallthrough;
281 case OFF_STATE:
282 ctrl->state = POWERON_STATE;
283 mutex_unlock(&ctrl->state_lock);
284 if (present)
285 ctrl_info(ctrl, "Slot(%s): Card present\n",
286 slot_name(ctrl));
287 if (link_active)
288 ctrl_info(ctrl, "Slot(%s): Link Up\n",
289 slot_name(ctrl));
290 ctrl->request_result = pciehp_enable_slot(ctrl);
291 break;
292 default:
293 mutex_unlock(&ctrl->state_lock);
294 break;
295 }
296}
297
298static int __pciehp_enable_slot(struct controller *ctrl)
299{
300 u8 getstatus = 0;
301
302 if (MRL_SENS(ctrl)) {
303 pciehp_get_latch_status(ctrl, &getstatus);
304 if (getstatus) {
305 ctrl_info(ctrl, "Slot(%s): Latch open\n",
306 slot_name(ctrl));
307 return -ENODEV;
308 }
309 }
310
311 if (POWER_CTRL(ctrl)) {
312 pciehp_get_power_status(ctrl, &getstatus);
313 if (getstatus) {
314 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
315 slot_name(ctrl));
316 return 0;
317 }
318 }
319
320 return board_added(ctrl);
321}
322
323static int pciehp_enable_slot(struct controller *ctrl)
324{
325 int ret;
326
327 pm_runtime_get_sync(&ctrl->pcie->port->dev);
328 ret = __pciehp_enable_slot(ctrl);
329 if (ret && ATTN_BUTTN(ctrl))
330 /* may be blinking */
331 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
332 INDICATOR_NOOP);
333 pm_runtime_put(&ctrl->pcie->port->dev);
334
335 mutex_lock(&ctrl->state_lock);
336 ctrl->state = ret ? OFF_STATE : ON_STATE;
337 mutex_unlock(&ctrl->state_lock);
338
339 return ret;
340}
341
342static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
343{
344 u8 getstatus = 0;
345
346 if (POWER_CTRL(ctrl)) {
347 pciehp_get_power_status(ctrl, &getstatus);
348 if (!getstatus) {
349 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
350 slot_name(ctrl));
351 return -EINVAL;
352 }
353 }
354
355 remove_board(ctrl, safe_removal);
356 return 0;
357}
358
359static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
360{
361 int ret;
362
363 pm_runtime_get_sync(&ctrl->pcie->port->dev);
364 ret = __pciehp_disable_slot(ctrl, safe_removal);
365 pm_runtime_put(&ctrl->pcie->port->dev);
366
367 mutex_lock(&ctrl->state_lock);
368 ctrl->state = OFF_STATE;
369 mutex_unlock(&ctrl->state_lock);
370
371 return ret;
372}
373
374int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
375{
376 struct controller *ctrl = to_ctrl(hotplug_slot);
377
378 mutex_lock(&ctrl->state_lock);
379 switch (ctrl->state) {
380 case BLINKINGON_STATE:
381 case OFF_STATE:
382 mutex_unlock(&ctrl->state_lock);
383 /*
384 * The IRQ thread becomes a no-op if the user pulls out the
385 * card before the thread wakes up, so initialize to -ENODEV.
386 */
387 ctrl->request_result = -ENODEV;
388 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
389 wait_event(ctrl->requester,
390 !atomic_read(&ctrl->pending_events) &&
391 !ctrl->ist_running);
392 return ctrl->request_result;
393 case POWERON_STATE:
394 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
395 slot_name(ctrl));
396 break;
397 case BLINKINGOFF_STATE:
398 case ON_STATE:
399 case POWEROFF_STATE:
400 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
401 slot_name(ctrl));
402 break;
403 default:
404 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
405 slot_name(ctrl), ctrl->state);
406 break;
407 }
408 mutex_unlock(&ctrl->state_lock);
409
410 return -ENODEV;
411}
412
413int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
414{
415 struct controller *ctrl = to_ctrl(hotplug_slot);
416
417 mutex_lock(&ctrl->state_lock);
418 switch (ctrl->state) {
419 case BLINKINGOFF_STATE:
420 case ON_STATE:
421 mutex_unlock(&ctrl->state_lock);
422 pciehp_request(ctrl, DISABLE_SLOT);
423 wait_event(ctrl->requester,
424 !atomic_read(&ctrl->pending_events) &&
425 !ctrl->ist_running);
426 return ctrl->request_result;
427 case POWEROFF_STATE:
428 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
429 slot_name(ctrl));
430 break;
431 case BLINKINGON_STATE:
432 case OFF_STATE:
433 case POWERON_STATE:
434 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
435 slot_name(ctrl));
436 break;
437 default:
438 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
439 slot_name(ctrl), ctrl->state);
440 break;
441 }
442 mutex_unlock(&ctrl->state_lock);
443
444 return -ENODEV;
445}