2 * PCI Express Hot Plug Controller Driver
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
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.
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
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.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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>
38 static void interrupt_event_handler(struct work_struct *work);
40 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
42 struct event_info *info;
44 info = kmalloc(sizeof(*info), GFP_ATOMIC);
48 info->event_type = event_type;
49 info->p_slot = p_slot;
50 INIT_WORK(&info->work, interrupt_event_handler);
52 queue_work(p_slot->wq, &info->work);
57 u8 pciehp_handle_attention_button(struct slot *p_slot)
60 struct controller *ctrl = p_slot->ctrl;
62 /* Attention Button Change */
63 ctrl_dbg(ctrl, "Attention button interrupt received\n");
66 * Button pressed - See if need to TAKE ACTION!!!
68 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
69 event_type = INT_BUTTON_PRESS;
71 queue_interrupt_event(p_slot, event_type);
76 u8 pciehp_handle_switch_change(struct slot *p_slot)
80 struct controller *ctrl = p_slot->ctrl;
83 ctrl_dbg(ctrl, "Switch interrupt received\n");
85 pciehp_get_latch_status(p_slot, &getstatus);
90 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
91 event_type = INT_SWITCH_OPEN;
96 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
97 event_type = INT_SWITCH_CLOSE;
100 queue_interrupt_event(p_slot, event_type);
105 u8 pciehp_handle_presence_change(struct slot *p_slot)
109 struct controller *ctrl = p_slot->ctrl;
111 /* Presence Change */
112 ctrl_dbg(ctrl, "Presence/Notify input change\n");
114 /* Switch is open, assume a presence change
115 * Save the presence state
117 pciehp_get_adapter_status(p_slot, &presence_save);
122 ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
123 event_type = INT_PRESENCE_ON;
128 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
130 event_type = INT_PRESENCE_OFF;
133 queue_interrupt_event(p_slot, event_type);
138 u8 pciehp_handle_power_fault(struct slot *p_slot)
141 struct controller *ctrl = p_slot->ctrl;
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);
153 void pciehp_handle_linkstate_change(struct slot *p_slot)
156 struct controller *ctrl = p_slot->ctrl;
158 /* Link Status Change */
159 ctrl_dbg(ctrl, "Data Link Layer State change\n");
161 if (pciehp_check_link_active(ctrl)) {
162 ctrl_info(ctrl, "slot(%s): Link Up event\n",
164 event_type = INT_LINK_UP;
166 ctrl_info(ctrl, "slot(%s): Link Down event\n",
168 event_type = INT_LINK_DOWN;
171 queue_interrupt_event(p_slot, event_type);
174 /* The following routines constitute the bulk of the
175 hotplug controller logic
178 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
180 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
181 if (POWER_CTRL(ctrl)) {
182 pciehp_power_off_slot(pslot);
185 * After turning power off, we must wait for at least 1 second
186 * before taking any action that relies on power having been
187 * removed from the slot/adapter.
192 pciehp_green_led_off(pslot);
193 pciehp_set_attention_status(pslot, 1);
197 * board_added - Called after a board has been added to the system.
198 * @p_slot: &slot where board is added
200 * Turns power on for the board.
203 static int board_added(struct slot *p_slot)
206 struct controller *ctrl = p_slot->ctrl;
207 struct pci_bus *parent = ctrl->pcie->port->subordinate;
209 if (POWER_CTRL(ctrl)) {
211 retval = pciehp_power_on_slot(p_slot);
216 pciehp_green_led_blink(p_slot);
218 /* Check link training status */
219 retval = pciehp_check_link_status(ctrl);
221 ctrl_err(ctrl, "Failed to check link status\n");
225 /* Check for a power fault */
226 if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
227 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
232 retval = pciehp_configure_device(p_slot);
234 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
235 pci_domain_nr(parent), parent->number);
239 pciehp_green_led_on(p_slot);
243 set_slot_off(ctrl, p_slot);
248 * remove_board - Turns off slot and LEDs
249 * @p_slot: slot where board is being removed
251 static int remove_board(struct slot *p_slot)
254 struct controller *ctrl = p_slot->ctrl;
256 retval = pciehp_unconfigure_device(p_slot);
260 if (POWER_CTRL(ctrl)) {
261 pciehp_power_off_slot(p_slot);
264 * After turning power off, we must wait for at least 1 second
265 * before taking any action that relies on power having been
266 * removed from the slot/adapter.
271 /* turn off Green LED */
272 pciehp_green_led_off(p_slot);
276 struct power_work_info {
278 struct work_struct work;
282 * pciehp_power_thread - handle pushbutton events
283 * @work: &struct work_struct describing work to be done
285 * Scheduled procedure to handle blocking stuff for the pushbuttons.
286 * Handles all pending events and exits.
288 static void pciehp_power_thread(struct work_struct *work)
290 struct power_work_info *info =
291 container_of(work, struct power_work_info, work);
292 struct slot *p_slot = info->p_slot;
294 mutex_lock(&p_slot->lock);
295 switch (p_slot->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;
307 mutex_unlock(&p_slot->lock);
308 if (pciehp_enable_slot(p_slot))
309 pciehp_green_led_off(p_slot);
310 mutex_lock(&p_slot->lock);
311 p_slot->state = STATIC_STATE;
316 mutex_unlock(&p_slot->lock);
321 void pciehp_queue_pushbutton_work(struct work_struct *work)
323 struct slot *p_slot = container_of(work, struct slot, work.work);
324 struct power_work_info *info;
326 info = kmalloc(sizeof(*info), GFP_KERNEL);
328 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
332 info->p_slot = p_slot;
333 INIT_WORK(&info->work, pciehp_power_thread);
335 mutex_lock(&p_slot->lock);
336 switch (p_slot->state) {
337 case BLINKINGOFF_STATE:
338 p_slot->state = POWEROFF_STATE;
340 case BLINKINGON_STATE:
341 p_slot->state = POWERON_STATE;
347 queue_work(p_slot->wq, &info->work);
349 mutex_unlock(&p_slot->lock);
353 * Note: This function must be called with slot->lock held
355 static void handle_button_press_event(struct slot *p_slot)
357 struct controller *ctrl = p_slot->ctrl;
360 switch (p_slot->state) {
362 pciehp_get_power_status(p_slot, &getstatus);
364 p_slot->state = BLINKINGOFF_STATE;
366 "PCI slot #%s - powering off due to button "
367 "press.\n", slot_name(p_slot));
369 p_slot->state = BLINKINGON_STATE;
371 "PCI slot #%s - powering on due to button "
372 "press.\n", slot_name(p_slot));
374 /* blink green LED and turn off amber */
375 pciehp_green_led_blink(p_slot);
376 pciehp_set_attention_status(p_slot, 0);
377 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
379 case BLINKINGOFF_STATE:
380 case BLINKINGON_STATE:
382 * Cancel if we are still blinking; this means that we
383 * press the attention again before the 5 sec. limit
384 * expires to cancel hot-add or hot-remove
386 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
387 cancel_delayed_work(&p_slot->work);
388 if (p_slot->state == BLINKINGOFF_STATE) {
389 pciehp_green_led_on(p_slot);
391 pciehp_green_led_off(p_slot);
393 pciehp_set_attention_status(p_slot, 0);
394 ctrl_info(ctrl, "PCI slot #%s - action canceled "
395 "due to button press\n", slot_name(p_slot));
396 p_slot->state = STATIC_STATE;
401 * Ignore if the slot is on power-on or power-off state;
402 * this means that the previous attention button action
403 * to hot-add or hot-remove is undergoing
405 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
408 ctrl_warn(ctrl, "Not a valid state\n");
414 * Note: This function must be called with slot->lock held
416 static void handle_surprise_event(struct slot *p_slot)
419 struct power_work_info *info;
421 info = kmalloc(sizeof(*info), GFP_KERNEL);
423 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
427 info->p_slot = p_slot;
428 INIT_WORK(&info->work, pciehp_power_thread);
430 pciehp_get_adapter_status(p_slot, &getstatus);
432 p_slot->state = POWEROFF_STATE;
434 p_slot->state = POWERON_STATE;
436 queue_work(p_slot->wq, &info->work);
440 * Note: This function must be called with slot->lock held
442 static void handle_link_event(struct slot *p_slot, u32 event)
444 struct controller *ctrl = p_slot->ctrl;
445 struct power_work_info *info;
447 info = kmalloc(sizeof(*info), GFP_KERNEL);
449 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
453 info->p_slot = p_slot;
454 INIT_WORK(&info->work, pciehp_power_thread);
456 switch (p_slot->state) {
457 case BLINKINGON_STATE:
458 case BLINKINGOFF_STATE:
459 cancel_delayed_work(&p_slot->work);
462 p_slot->state = event == INT_LINK_UP ?
463 POWERON_STATE : POWEROFF_STATE;
464 queue_work(p_slot->wq, &info->work);
467 if (event == INT_LINK_UP) {
469 "Link Up event ignored on slot(%s): already powering on\n",
474 "Link Down event queued on slot(%s): currently getting powered on\n",
476 p_slot->state = POWEROFF_STATE;
477 queue_work(p_slot->wq, &info->work);
481 if (event == INT_LINK_UP) {
483 "Link Up event queued on slot(%s): currently getting powered off\n",
485 p_slot->state = POWERON_STATE;
486 queue_work(p_slot->wq, &info->work);
489 "Link Down event ignored on slot(%s): already powering off\n",
495 ctrl_err(ctrl, "Not a valid state on slot(%s)\n",
502 static void interrupt_event_handler(struct work_struct *work)
504 struct event_info *info = container_of(work, struct event_info, work);
505 struct slot *p_slot = info->p_slot;
506 struct controller *ctrl = p_slot->ctrl;
508 mutex_lock(&p_slot->lock);
509 switch (info->event_type) {
510 case INT_BUTTON_PRESS:
511 handle_button_press_event(p_slot);
513 case INT_POWER_FAULT:
514 if (!POWER_CTRL(ctrl))
516 pciehp_set_attention_status(p_slot, 1);
517 pciehp_green_led_off(p_slot);
519 case INT_PRESENCE_ON:
520 case INT_PRESENCE_OFF:
521 if (!HP_SUPR_RM(ctrl))
523 ctrl_dbg(ctrl, "Surprise Removal\n");
524 handle_surprise_event(p_slot);
528 handle_link_event(p_slot, info->event_type);
533 mutex_unlock(&p_slot->lock);
538 int pciehp_enable_slot(struct slot *p_slot)
542 struct controller *ctrl = p_slot->ctrl;
544 pciehp_get_adapter_status(p_slot, &getstatus);
546 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
549 if (MRL_SENS(p_slot->ctrl)) {
550 pciehp_get_latch_status(p_slot, &getstatus);
552 ctrl_info(ctrl, "Latch open on slot(%s)\n",
558 if (POWER_CTRL(p_slot->ctrl)) {
559 pciehp_get_power_status(p_slot, &getstatus);
561 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
567 pciehp_get_latch_status(p_slot, &getstatus);
569 rc = board_added(p_slot);
571 pciehp_get_latch_status(p_slot, &getstatus);
577 int pciehp_disable_slot(struct slot *p_slot)
580 struct controller *ctrl = p_slot->ctrl;
585 if (POWER_CTRL(p_slot->ctrl)) {
586 pciehp_get_power_status(p_slot, &getstatus);
588 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
594 return remove_board(p_slot);
597 int pciehp_sysfs_enable_slot(struct slot *p_slot)
599 int retval = -ENODEV;
600 struct controller *ctrl = p_slot->ctrl;
602 mutex_lock(&p_slot->lock);
603 switch (p_slot->state) {
604 case BLINKINGON_STATE:
605 cancel_delayed_work(&p_slot->work);
607 p_slot->state = POWERON_STATE;
608 mutex_unlock(&p_slot->lock);
609 retval = pciehp_enable_slot(p_slot);
610 mutex_lock(&p_slot->lock);
611 p_slot->state = STATIC_STATE;
614 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
617 case BLINKINGOFF_STATE:
619 ctrl_info(ctrl, "Already enabled on slot %s\n",
623 ctrl_err(ctrl, "Not a valid state on slot %s\n",
627 mutex_unlock(&p_slot->lock);
632 int pciehp_sysfs_disable_slot(struct slot *p_slot)
634 int retval = -ENODEV;
635 struct controller *ctrl = p_slot->ctrl;
637 mutex_lock(&p_slot->lock);
638 switch (p_slot->state) {
639 case BLINKINGOFF_STATE:
640 cancel_delayed_work(&p_slot->work);
642 p_slot->state = POWEROFF_STATE;
643 mutex_unlock(&p_slot->lock);
644 retval = pciehp_disable_slot(p_slot);
645 mutex_lock(&p_slot->lock);
646 p_slot->state = STATIC_STATE;
649 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
652 case BLINKINGON_STATE:
654 ctrl_info(ctrl, "Already disabled on slot %s\n",
658 ctrl_err(ctrl, "Not a valid state on slot %s\n",
662 mutex_unlock(&p_slot->lock);