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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#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 "pciehp.h"
23
24static void interrupt_event_handler(struct work_struct *work);
25
26void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
27{
28 struct event_info *info;
29
30 info = kmalloc(sizeof(*info), GFP_ATOMIC);
31 if (!info) {
32 ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
33 return;
34 }
35
36 INIT_WORK(&info->work, interrupt_event_handler);
37 info->event_type = event_type;
38 info->p_slot = p_slot;
39 queue_work(p_slot->wq, &info->work);
40}
41
42/* The following routines constitute the bulk of the
43 hotplug controller logic
44 */
45
46static void set_slot_off(struct controller *ctrl, struct slot *pslot)
47{
48 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
49 if (POWER_CTRL(ctrl)) {
50 pciehp_power_off_slot(pslot);
51
52 /*
53 * After turning power off, we must wait for at least 1 second
54 * before taking any action that relies on power having been
55 * removed from the slot/adapter.
56 */
57 msleep(1000);
58 }
59
60 pciehp_green_led_off(pslot);
61 pciehp_set_attention_status(pslot, 1);
62}
63
64/**
65 * board_added - Called after a board has been added to the system.
66 * @p_slot: &slot where board is added
67 *
68 * Turns power on for the board.
69 * Configures board.
70 */
71static int board_added(struct slot *p_slot)
72{
73 int retval = 0;
74 struct controller *ctrl = p_slot->ctrl;
75 struct pci_bus *parent = ctrl->pcie->port->subordinate;
76
77 if (POWER_CTRL(ctrl)) {
78 /* Power on slot */
79 retval = pciehp_power_on_slot(p_slot);
80 if (retval)
81 return retval;
82 }
83
84 pciehp_green_led_blink(p_slot);
85
86 /* Check link training status */
87 retval = pciehp_check_link_status(ctrl);
88 if (retval) {
89 ctrl_err(ctrl, "Failed to check link status\n");
90 goto err_exit;
91 }
92
93 /* Check for a power fault */
94 if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
95 ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(p_slot));
96 retval = -EIO;
97 goto err_exit;
98 }
99
100 retval = pciehp_configure_device(p_slot);
101 if (retval) {
102 if (retval != -EEXIST) {
103 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
104 pci_domain_nr(parent), parent->number);
105 goto err_exit;
106 }
107 }
108
109 pciehp_green_led_on(p_slot);
110 pciehp_set_attention_status(p_slot, 0);
111 return 0;
112
113err_exit:
114 set_slot_off(ctrl, p_slot);
115 return retval;
116}
117
118/**
119 * remove_board - Turns off slot and LEDs
120 * @p_slot: slot where board is being removed
121 */
122static int remove_board(struct slot *p_slot)
123{
124 int retval;
125 struct controller *ctrl = p_slot->ctrl;
126
127 retval = pciehp_unconfigure_device(p_slot);
128 if (retval)
129 return retval;
130
131 if (POWER_CTRL(ctrl)) {
132 pciehp_power_off_slot(p_slot);
133
134 /*
135 * After turning power off, we must wait for at least 1 second
136 * before taking any action that relies on power having been
137 * removed from the slot/adapter.
138 */
139 msleep(1000);
140 }
141
142 /* turn off Green LED */
143 pciehp_green_led_off(p_slot);
144 return 0;
145}
146
147struct power_work_info {
148 struct slot *p_slot;
149 struct work_struct work;
150 unsigned int req;
151#define DISABLE_REQ 0
152#define ENABLE_REQ 1
153};
154
155/**
156 * pciehp_power_thread - handle pushbutton events
157 * @work: &struct work_struct describing work to be done
158 *
159 * Scheduled procedure to handle blocking stuff for the pushbuttons.
160 * Handles all pending events and exits.
161 */
162static void pciehp_power_thread(struct work_struct *work)
163{
164 struct power_work_info *info =
165 container_of(work, struct power_work_info, work);
166 struct slot *p_slot = info->p_slot;
167 int ret;
168
169 switch (info->req) {
170 case DISABLE_REQ:
171 mutex_lock(&p_slot->hotplug_lock);
172 pciehp_disable_slot(p_slot);
173 mutex_unlock(&p_slot->hotplug_lock);
174 mutex_lock(&p_slot->lock);
175 p_slot->state = STATIC_STATE;
176 mutex_unlock(&p_slot->lock);
177 break;
178 case ENABLE_REQ:
179 mutex_lock(&p_slot->hotplug_lock);
180 ret = pciehp_enable_slot(p_slot);
181 mutex_unlock(&p_slot->hotplug_lock);
182 if (ret)
183 pciehp_green_led_off(p_slot);
184 mutex_lock(&p_slot->lock);
185 p_slot->state = STATIC_STATE;
186 mutex_unlock(&p_slot->lock);
187 break;
188 default:
189 break;
190 }
191
192 kfree(info);
193}
194
195static void pciehp_queue_power_work(struct slot *p_slot, int req)
196{
197 struct power_work_info *info;
198
199 p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;
200
201 info = kmalloc(sizeof(*info), GFP_KERNEL);
202 if (!info) {
203 ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
204 (req == ENABLE_REQ) ? "poweron" : "poweroff");
205 return;
206 }
207 info->p_slot = p_slot;
208 INIT_WORK(&info->work, pciehp_power_thread);
209 info->req = req;
210 queue_work(p_slot->wq, &info->work);
211}
212
213void pciehp_queue_pushbutton_work(struct work_struct *work)
214{
215 struct slot *p_slot = container_of(work, struct slot, work.work);
216
217 mutex_lock(&p_slot->lock);
218 switch (p_slot->state) {
219 case BLINKINGOFF_STATE:
220 pciehp_queue_power_work(p_slot, DISABLE_REQ);
221 break;
222 case BLINKINGON_STATE:
223 pciehp_queue_power_work(p_slot, ENABLE_REQ);
224 break;
225 default:
226 break;
227 }
228 mutex_unlock(&p_slot->lock);
229}
230
231/*
232 * Note: This function must be called with slot->lock held
233 */
234static void handle_button_press_event(struct slot *p_slot)
235{
236 struct controller *ctrl = p_slot->ctrl;
237 u8 getstatus;
238
239 switch (p_slot->state) {
240 case STATIC_STATE:
241 pciehp_get_power_status(p_slot, &getstatus);
242 if (getstatus) {
243 p_slot->state = BLINKINGOFF_STATE;
244 ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
245 slot_name(p_slot));
246 } else {
247 p_slot->state = BLINKINGON_STATE;
248 ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
249 slot_name(p_slot));
250 }
251 /* blink green LED and turn off amber */
252 pciehp_green_led_blink(p_slot);
253 pciehp_set_attention_status(p_slot, 0);
254 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
255 break;
256 case BLINKINGOFF_STATE:
257 case BLINKINGON_STATE:
258 /*
259 * Cancel if we are still blinking; this means that we
260 * press the attention again before the 5 sec. limit
261 * expires to cancel hot-add or hot-remove
262 */
263 ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(p_slot));
264 cancel_delayed_work(&p_slot->work);
265 if (p_slot->state == BLINKINGOFF_STATE)
266 pciehp_green_led_on(p_slot);
267 else
268 pciehp_green_led_off(p_slot);
269 pciehp_set_attention_status(p_slot, 0);
270 ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
271 slot_name(p_slot));
272 p_slot->state = STATIC_STATE;
273 break;
274 case POWEROFF_STATE:
275 case POWERON_STATE:
276 /*
277 * Ignore if the slot is on power-on or power-off state;
278 * this means that the previous attention button action
279 * to hot-add or hot-remove is undergoing
280 */
281 ctrl_info(ctrl, "Slot(%s): Button ignored\n",
282 slot_name(p_slot));
283 break;
284 default:
285 ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
286 slot_name(p_slot), p_slot->state);
287 break;
288 }
289}
290
291/*
292 * Note: This function must be called with slot->lock held
293 */
294static void handle_link_event(struct slot *p_slot, u32 event)
295{
296 struct controller *ctrl = p_slot->ctrl;
297
298 switch (p_slot->state) {
299 case BLINKINGON_STATE:
300 case BLINKINGOFF_STATE:
301 cancel_delayed_work(&p_slot->work);
302 /* Fall through */
303 case STATIC_STATE:
304 pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
305 ENABLE_REQ : DISABLE_REQ);
306 break;
307 case POWERON_STATE:
308 if (event == INT_LINK_UP) {
309 ctrl_info(ctrl, "Slot(%s): Link Up event ignored; already powering on\n",
310 slot_name(p_slot));
311 } else {
312 ctrl_info(ctrl, "Slot(%s): Link Down event queued; currently getting powered on\n",
313 slot_name(p_slot));
314 pciehp_queue_power_work(p_slot, DISABLE_REQ);
315 }
316 break;
317 case POWEROFF_STATE:
318 if (event == INT_LINK_UP) {
319 ctrl_info(ctrl, "Slot(%s): Link Up event queued; currently getting powered off\n",
320 slot_name(p_slot));
321 pciehp_queue_power_work(p_slot, ENABLE_REQ);
322 } else {
323 ctrl_info(ctrl, "Slot(%s): Link Down event ignored; already powering off\n",
324 slot_name(p_slot));
325 }
326 break;
327 default:
328 ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
329 slot_name(p_slot), p_slot->state);
330 break;
331 }
332}
333
334static void interrupt_event_handler(struct work_struct *work)
335{
336 struct event_info *info = container_of(work, struct event_info, work);
337 struct slot *p_slot = info->p_slot;
338 struct controller *ctrl = p_slot->ctrl;
339
340 mutex_lock(&p_slot->lock);
341 switch (info->event_type) {
342 case INT_BUTTON_PRESS:
343 handle_button_press_event(p_slot);
344 break;
345 case INT_POWER_FAULT:
346 if (!POWER_CTRL(ctrl))
347 break;
348 pciehp_set_attention_status(p_slot, 1);
349 pciehp_green_led_off(p_slot);
350 break;
351 case INT_PRESENCE_ON:
352 pciehp_queue_power_work(p_slot, ENABLE_REQ);
353 break;
354 case INT_PRESENCE_OFF:
355 /*
356 * Regardless of surprise capability, we need to
357 * definitely remove a card that has been pulled out!
358 */
359 pciehp_queue_power_work(p_slot, DISABLE_REQ);
360 break;
361 case INT_LINK_UP:
362 case INT_LINK_DOWN:
363 handle_link_event(p_slot, info->event_type);
364 break;
365 default:
366 break;
367 }
368 mutex_unlock(&p_slot->lock);
369
370 kfree(info);
371}
372
373/*
374 * Note: This function must be called with slot->hotplug_lock held
375 */
376int pciehp_enable_slot(struct slot *p_slot)
377{
378 u8 getstatus = 0;
379 struct controller *ctrl = p_slot->ctrl;
380
381 pciehp_get_adapter_status(p_slot, &getstatus);
382 if (!getstatus) {
383 ctrl_info(ctrl, "Slot(%s): No adapter\n", slot_name(p_slot));
384 return -ENODEV;
385 }
386 if (MRL_SENS(p_slot->ctrl)) {
387 pciehp_get_latch_status(p_slot, &getstatus);
388 if (getstatus) {
389 ctrl_info(ctrl, "Slot(%s): Latch open\n",
390 slot_name(p_slot));
391 return -ENODEV;
392 }
393 }
394
395 if (POWER_CTRL(p_slot->ctrl)) {
396 pciehp_get_power_status(p_slot, &getstatus);
397 if (getstatus) {
398 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
399 slot_name(p_slot));
400 return 0;
401 }
402 }
403
404 return board_added(p_slot);
405}
406
407/*
408 * Note: This function must be called with slot->hotplug_lock held
409 */
410int pciehp_disable_slot(struct slot *p_slot)
411{
412 u8 getstatus = 0;
413 struct controller *ctrl = p_slot->ctrl;
414
415 if (!p_slot->ctrl)
416 return 1;
417
418 if (POWER_CTRL(p_slot->ctrl)) {
419 pciehp_get_power_status(p_slot, &getstatus);
420 if (!getstatus) {
421 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
422 slot_name(p_slot));
423 return -EINVAL;
424 }
425 }
426
427 return remove_board(p_slot);
428}
429
430int pciehp_sysfs_enable_slot(struct slot *p_slot)
431{
432 int retval = -ENODEV;
433 struct controller *ctrl = p_slot->ctrl;
434
435 mutex_lock(&p_slot->lock);
436 switch (p_slot->state) {
437 case BLINKINGON_STATE:
438 cancel_delayed_work(&p_slot->work);
439 case STATIC_STATE:
440 p_slot->state = POWERON_STATE;
441 mutex_unlock(&p_slot->lock);
442 mutex_lock(&p_slot->hotplug_lock);
443 retval = pciehp_enable_slot(p_slot);
444 mutex_unlock(&p_slot->hotplug_lock);
445 mutex_lock(&p_slot->lock);
446 p_slot->state = STATIC_STATE;
447 break;
448 case POWERON_STATE:
449 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
450 slot_name(p_slot));
451 break;
452 case BLINKINGOFF_STATE:
453 case POWEROFF_STATE:
454 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
455 slot_name(p_slot));
456 break;
457 default:
458 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
459 slot_name(p_slot), p_slot->state);
460 break;
461 }
462 mutex_unlock(&p_slot->lock);
463
464 return retval;
465}
466
467int pciehp_sysfs_disable_slot(struct slot *p_slot)
468{
469 int retval = -ENODEV;
470 struct controller *ctrl = p_slot->ctrl;
471
472 mutex_lock(&p_slot->lock);
473 switch (p_slot->state) {
474 case BLINKINGOFF_STATE:
475 cancel_delayed_work(&p_slot->work);
476 case STATIC_STATE:
477 p_slot->state = POWEROFF_STATE;
478 mutex_unlock(&p_slot->lock);
479 mutex_lock(&p_slot->hotplug_lock);
480 retval = pciehp_disable_slot(p_slot);
481 mutex_unlock(&p_slot->hotplug_lock);
482 mutex_lock(&p_slot->lock);
483 p_slot->state = STATIC_STATE;
484 break;
485 case POWEROFF_STATE:
486 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
487 slot_name(p_slot));
488 break;
489 case BLINKINGON_STATE:
490 case POWERON_STATE:
491 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
492 slot_name(p_slot));
493 break;
494 default:
495 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
496 slot_name(p_slot), p_slot->state);
497 break;
498 }
499 mutex_unlock(&p_slot->lock);
500
501 return retval;
502}