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/smp_lock.h>
34 #include <linux/pci.h>
35 #include <linux/workqueue.h>
39 static void interrupt_event_handler(struct work_struct *work);
41 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
43 struct event_info *info;
45 info = kmalloc(sizeof(*info), GFP_ATOMIC);
49 info->event_type = event_type;
50 info->p_slot = p_slot;
51 INIT_WORK(&info->work, interrupt_event_handler);
53 schedule_work(&info->work);
58 u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
63 /* Attention Button Change */
64 dbg("pciehp: Attention button interrupt received.\n");
66 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
69 * Button pressed - See if need to TAKE ACTION!!!
71 info("Button pressed on Slot(%s)\n", p_slot->name);
72 event_type = INT_BUTTON_PRESS;
74 queue_interrupt_event(p_slot, event_type);
79 u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
86 dbg("pciehp: Switch interrupt received.\n");
88 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
89 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
95 info("Latch open on Slot(%s)\n", p_slot->name);
96 event_type = INT_SWITCH_OPEN;
101 info("Latch close on Slot(%s)\n", p_slot->name);
102 event_type = INT_SWITCH_CLOSE;
105 queue_interrupt_event(p_slot, event_type);
110 u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
116 /* Presence Change */
117 dbg("pciehp: Presence/Notify input change.\n");
119 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
121 /* Switch is open, assume a presence change
122 * Save the presence state
124 p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
129 info("Card present on Slot(%s)\n", p_slot->name);
130 event_type = INT_PRESENCE_ON;
135 info("Card not present on Slot(%s)\n", p_slot->name);
136 event_type = INT_PRESENCE_OFF;
139 queue_interrupt_event(p_slot, event_type);
144 u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
150 dbg("pciehp: Power fault interrupt received.\n");
152 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
154 if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
156 * power fault Cleared
158 info("Power fault cleared on Slot(%s)\n", p_slot->name);
159 event_type = INT_POWER_FAULT_CLEAR;
164 info("Power fault on Slot(%s)\n", p_slot->name);
165 event_type = INT_POWER_FAULT;
166 info("power fault bit %x set\n", hp_slot);
169 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->ctrlcap)) {
182 if (pslot->hpc_ops->power_off_slot(pslot)) {
183 err("%s: Issue of Slot Power Off command failed\n",
189 if (PWR_LED(ctrl->ctrlcap))
190 pslot->hpc_ops->green_led_off(pslot);
192 if (ATTN_LED(ctrl->ctrlcap)) {
193 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
194 err("%s: Issue of Set Attention Led command failed\n",
202 * board_added - Called after a board has been added to the system.
203 * @p_slot: &slot where board is added
205 * Turns power on for the board.
208 static int board_added(struct slot *p_slot)
211 struct controller *ctrl = p_slot->ctrl;
213 dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
214 __FUNCTION__, p_slot->device,
215 ctrl->slot_device_offset, p_slot->hp_slot);
217 if (POWER_CTRL(ctrl->ctrlcap)) {
219 retval = p_slot->hpc_ops->power_on_slot(p_slot);
224 if (PWR_LED(ctrl->ctrlcap))
225 p_slot->hpc_ops->green_led_blink(p_slot);
227 /* Wait for ~1 second */
230 /* Check link training status */
231 retval = p_slot->hpc_ops->check_lnk_status(ctrl);
233 err("%s: Failed to check link status\n", __FUNCTION__);
234 set_slot_off(ctrl, p_slot);
238 /* Check for a power fault */
239 if (p_slot->hpc_ops->query_power_fault(p_slot)) {
240 dbg("%s: power fault detected\n", __FUNCTION__);
241 retval = POWER_FAILURE;
245 retval = pciehp_configure_device(p_slot);
247 err("Cannot add device 0x%x:%x\n", p_slot->bus,
253 * Some PCI Express root ports require fixup after hot-plug operation.
256 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
257 if (PWR_LED(ctrl->ctrlcap))
258 p_slot->hpc_ops->green_led_on(p_slot);
263 set_slot_off(ctrl, p_slot);
268 * remove_board - Turns off slot and LEDs
269 * @p_slot: slot where board is being removed
271 static int remove_board(struct slot *p_slot)
274 struct controller *ctrl = p_slot->ctrl;
276 retval = pciehp_unconfigure_device(p_slot);
280 dbg("In %s, hp_slot = %d\n", __FUNCTION__, p_slot->hp_slot);
282 if (POWER_CTRL(ctrl->ctrlcap)) {
284 retval = p_slot->hpc_ops->power_off_slot(p_slot);
286 err("%s: Issue of Slot Disable command failed\n",
292 if (PWR_LED(ctrl->ctrlcap))
293 /* turn off Green LED */
294 p_slot->hpc_ops->green_led_off(p_slot);
299 struct power_work_info {
301 struct work_struct work;
305 * pciehp_power_thread - handle pushbutton events
306 * @work: &struct work_struct describing work to be done
308 * Scheduled procedure to handle blocking stuff for the pushbuttons.
309 * Handles all pending events and exits.
311 static void pciehp_power_thread(struct work_struct *work)
313 struct power_work_info *info =
314 container_of(work, struct power_work_info, work);
315 struct slot *p_slot = info->p_slot;
317 mutex_lock(&p_slot->lock);
318 switch (p_slot->state) {
320 mutex_unlock(&p_slot->lock);
321 dbg("%s: disabling bus:device(%x:%x)\n",
322 __FUNCTION__, p_slot->bus, p_slot->device);
323 pciehp_disable_slot(p_slot);
324 mutex_lock(&p_slot->lock);
325 p_slot->state = STATIC_STATE;
328 mutex_unlock(&p_slot->lock);
329 if (pciehp_enable_slot(p_slot) &&
330 PWR_LED(p_slot->ctrl->ctrlcap))
331 p_slot->hpc_ops->green_led_off(p_slot);
332 mutex_lock(&p_slot->lock);
333 p_slot->state = STATIC_STATE;
338 mutex_unlock(&p_slot->lock);
343 void pciehp_queue_pushbutton_work(struct work_struct *work)
345 struct slot *p_slot = container_of(work, struct slot, work.work);
346 struct power_work_info *info;
348 info = kmalloc(sizeof(*info), GFP_KERNEL);
350 err("%s: Cannot allocate memory\n", __FUNCTION__);
353 info->p_slot = p_slot;
354 INIT_WORK(&info->work, pciehp_power_thread);
356 mutex_lock(&p_slot->lock);
357 switch (p_slot->state) {
358 case BLINKINGOFF_STATE:
359 p_slot->state = POWEROFF_STATE;
361 case BLINKINGON_STATE:
362 p_slot->state = POWERON_STATE;
367 queue_work(pciehp_wq, &info->work);
369 mutex_unlock(&p_slot->lock);
372 static int update_slot_info(struct slot *slot)
374 struct hotplug_slot_info *info;
377 info = kmalloc(sizeof(*info), GFP_KERNEL);
381 slot->hpc_ops->get_power_status(slot, &(info->power_status));
382 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
383 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
384 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
386 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
392 * Note: This function must be called with slot->lock held
394 static void handle_button_press_event(struct slot *p_slot)
396 struct controller *ctrl = p_slot->ctrl;
399 switch (p_slot->state) {
401 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
403 p_slot->state = BLINKINGOFF_STATE;
404 info("PCI slot #%s - powering off due to button "
405 "press.\n", p_slot->name);
407 p_slot->state = BLINKINGON_STATE;
408 info("PCI slot #%s - powering on due to button "
409 "press.\n", p_slot->name);
411 /* blink green LED and turn off amber */
412 if (PWR_LED(ctrl->ctrlcap))
413 p_slot->hpc_ops->green_led_blink(p_slot);
414 if (ATTN_LED(ctrl->ctrlcap))
415 p_slot->hpc_ops->set_attention_status(p_slot, 0);
417 schedule_delayed_work(&p_slot->work, 5*HZ);
419 case BLINKINGOFF_STATE:
420 case BLINKINGON_STATE:
422 * Cancel if we are still blinking; this means that we
423 * press the attention again before the 5 sec. limit
424 * expires to cancel hot-add or hot-remove
426 info("Button cancel on Slot(%s)\n", p_slot->name);
427 dbg("%s: button cancel\n", __FUNCTION__);
428 cancel_delayed_work(&p_slot->work);
429 if (p_slot->state == BLINKINGOFF_STATE) {
430 if (PWR_LED(ctrl->ctrlcap))
431 p_slot->hpc_ops->green_led_on(p_slot);
433 if (PWR_LED(ctrl->ctrlcap))
434 p_slot->hpc_ops->green_led_off(p_slot);
436 if (ATTN_LED(ctrl->ctrlcap))
437 p_slot->hpc_ops->set_attention_status(p_slot, 0);
438 info("PCI slot #%s - action canceled due to button press\n",
440 p_slot->state = STATIC_STATE;
445 * Ignore if the slot is on power-on or power-off state;
446 * this means that the previous attention button action
447 * to hot-add or hot-remove is undergoing
449 info("Button ignore on Slot(%s)\n", p_slot->name);
450 update_slot_info(p_slot);
453 warn("Not a valid state\n");
459 * Note: This function must be called with slot->lock held
461 static void handle_surprise_event(struct slot *p_slot)
464 struct power_work_info *info;
466 info = kmalloc(sizeof(*info), GFP_KERNEL);
468 err("%s: Cannot allocate memory\n", __FUNCTION__);
471 info->p_slot = p_slot;
472 INIT_WORK(&info->work, pciehp_power_thread);
474 p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
476 p_slot->state = POWEROFF_STATE;
478 p_slot->state = POWERON_STATE;
480 queue_work(pciehp_wq, &info->work);
483 static void interrupt_event_handler(struct work_struct *work)
485 struct event_info *info = container_of(work, struct event_info, work);
486 struct slot *p_slot = info->p_slot;
487 struct controller *ctrl = p_slot->ctrl;
489 mutex_lock(&p_slot->lock);
490 switch (info->event_type) {
491 case INT_BUTTON_PRESS:
492 handle_button_press_event(p_slot);
494 case INT_POWER_FAULT:
495 if (!POWER_CTRL(ctrl->ctrlcap))
497 if (ATTN_LED(ctrl->ctrlcap))
498 p_slot->hpc_ops->set_attention_status(p_slot, 1);
499 if (PWR_LED(ctrl->ctrlcap))
500 p_slot->hpc_ops->green_led_off(p_slot);
502 case INT_PRESENCE_ON:
503 case INT_PRESENCE_OFF:
504 if (!HP_SUPR_RM(ctrl->ctrlcap))
506 dbg("Surprise Removal\n");
507 update_slot_info(p_slot);
508 handle_surprise_event(p_slot);
511 update_slot_info(p_slot);
514 mutex_unlock(&p_slot->lock);
519 int pciehp_enable_slot(struct slot *p_slot)
524 /* Check to see if (latch closed, card present, power off) */
525 mutex_lock(&p_slot->ctrl->crit_sect);
527 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
528 if (rc || !getstatus) {
529 info("%s: no adapter on slot(%s)\n", __FUNCTION__,
531 mutex_unlock(&p_slot->ctrl->crit_sect);
534 if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
535 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
536 if (rc || getstatus) {
537 info("%s: latch open on slot(%s)\n", __FUNCTION__,
539 mutex_unlock(&p_slot->ctrl->crit_sect);
544 if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
545 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
546 if (rc || getstatus) {
547 info("%s: already enabled on slot(%s)\n", __FUNCTION__,
549 mutex_unlock(&p_slot->ctrl->crit_sect);
554 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
556 rc = board_added(p_slot);
558 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
561 update_slot_info(p_slot);
563 mutex_unlock(&p_slot->ctrl->crit_sect);
568 int pciehp_disable_slot(struct slot *p_slot)
576 /* Check to see if (latch closed, card present, power on) */
577 mutex_lock(&p_slot->ctrl->crit_sect);
579 if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
580 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
581 if (ret || !getstatus) {
582 info("%s: no adapter on slot(%s)\n", __FUNCTION__,
584 mutex_unlock(&p_slot->ctrl->crit_sect);
589 if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
590 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
591 if (ret || getstatus) {
592 info("%s: latch open on slot(%s)\n", __FUNCTION__,
594 mutex_unlock(&p_slot->ctrl->crit_sect);
599 if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
600 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
601 if (ret || !getstatus) {
602 info("%s: already disabled slot(%s)\n", __FUNCTION__,
604 mutex_unlock(&p_slot->ctrl->crit_sect);
609 ret = remove_board(p_slot);
610 update_slot_info(p_slot);
612 mutex_unlock(&p_slot->ctrl->crit_sect);
616 int pciehp_sysfs_enable_slot(struct slot *p_slot)
618 int retval = -ENODEV;
620 mutex_lock(&p_slot->lock);
621 switch (p_slot->state) {
622 case BLINKINGON_STATE:
623 cancel_delayed_work(&p_slot->work);
625 p_slot->state = POWERON_STATE;
626 mutex_unlock(&p_slot->lock);
627 retval = pciehp_enable_slot(p_slot);
628 mutex_lock(&p_slot->lock);
629 p_slot->state = STATIC_STATE;
632 info("Slot %s is already in powering on state\n",
635 case BLINKINGOFF_STATE:
637 info("Already enabled on slot %s\n", p_slot->name);
640 err("Not a valid state on slot %s\n", p_slot->name);
643 mutex_unlock(&p_slot->lock);
648 int pciehp_sysfs_disable_slot(struct slot *p_slot)
650 int retval = -ENODEV;
652 mutex_lock(&p_slot->lock);
653 switch (p_slot->state) {
654 case BLINKINGOFF_STATE:
655 cancel_delayed_work(&p_slot->work);
657 p_slot->state = POWEROFF_STATE;
658 mutex_unlock(&p_slot->lock);
659 retval = pciehp_disable_slot(p_slot);
660 mutex_lock(&p_slot->lock);
661 p_slot->state = STATIC_STATE;
664 info("Slot %s is already in powering off state\n",
667 case BLINKINGON_STATE:
669 info("Already disabled on slot %s\n", p_slot->name);
672 err("Not a valid state on slot %s\n", p_slot->name);
675 mutex_unlock(&p_slot->lock);