Loading...
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/*
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}