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