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/pci.h>
34 #include <linux/workqueue.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 schedule_work(&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");
146 if (!pciehp_query_power_fault(p_slot)) {
148 * power fault Cleared
150 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
152 event_type = INT_POWER_FAULT_CLEAR;
157 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
158 event_type = INT_POWER_FAULT;
159 ctrl_info(ctrl, "Power fault bit %x set\n", 0);
162 queue_interrupt_event(p_slot, event_type);
167 /* The following routines constitute the bulk of the
168 hotplug controller logic
171 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
173 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
174 if (POWER_CTRL(ctrl)) {
175 if (pciehp_power_off_slot(pslot)) {
177 "Issue of Slot Power Off command failed\n");
181 * After turning power off, we must wait for at least 1 second
182 * before taking any action that relies on power having been
183 * removed from the slot/adapter.
189 pciehp_green_led_off(pslot);
191 if (ATTN_LED(ctrl)) {
192 if (pciehp_set_attention_status(pslot, 1)) {
194 "Issue of Set Attention Led command failed\n");
201 * board_added - Called after a board has been added to the system.
202 * @p_slot: &slot where board is added
204 * Turns power on for the board.
207 static int board_added(struct slot *p_slot)
210 struct controller *ctrl = p_slot->ctrl;
211 struct pci_bus *parent = ctrl->pcie->port->subordinate;
213 if (POWER_CTRL(ctrl)) {
215 retval = pciehp_power_on_slot(p_slot);
221 pciehp_green_led_blink(p_slot);
223 /* Check link training status */
224 retval = pciehp_check_link_status(ctrl);
226 ctrl_err(ctrl, "Failed to check link status\n");
227 set_slot_off(ctrl, p_slot);
231 /* Check for a power fault */
232 if (pciehp_query_power_fault(p_slot)) {
233 ctrl_dbg(ctrl, "Power fault detected\n");
238 retval = pciehp_configure_device(p_slot);
240 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
241 pci_domain_nr(parent), parent->number);
246 pciehp_green_led_on(p_slot);
251 set_slot_off(ctrl, p_slot);
256 * remove_board - Turns off slot and LEDs
257 * @p_slot: slot where board is being removed
259 static int remove_board(struct slot *p_slot)
262 struct controller *ctrl = p_slot->ctrl;
264 retval = pciehp_unconfigure_device(p_slot);
268 if (POWER_CTRL(ctrl)) {
270 retval = pciehp_power_off_slot(p_slot);
273 "Issue of Slot Disable command failed\n");
277 * After turning power off, we must wait for at least 1 second
278 * before taking any action that relies on power having been
279 * removed from the slot/adapter.
284 /* turn off Green LED */
286 pciehp_green_led_off(p_slot);
291 struct power_work_info {
293 struct work_struct work;
297 * pciehp_power_thread - handle pushbutton events
298 * @work: &struct work_struct describing work to be done
300 * Scheduled procedure to handle blocking stuff for the pushbuttons.
301 * Handles all pending events and exits.
303 static void pciehp_power_thread(struct work_struct *work)
305 struct power_work_info *info =
306 container_of(work, struct power_work_info, work);
307 struct slot *p_slot = info->p_slot;
309 mutex_lock(&p_slot->lock);
310 switch (p_slot->state) {
312 mutex_unlock(&p_slot->lock);
313 ctrl_dbg(p_slot->ctrl,
314 "Disabling domain:bus:device=%04x:%02x:00\n",
315 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
316 p_slot->ctrl->pcie->port->subordinate->number);
317 pciehp_disable_slot(p_slot);
318 mutex_lock(&p_slot->lock);
319 p_slot->state = STATIC_STATE;
322 mutex_unlock(&p_slot->lock);
323 if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
324 pciehp_green_led_off(p_slot);
325 mutex_lock(&p_slot->lock);
326 p_slot->state = STATIC_STATE;
331 mutex_unlock(&p_slot->lock);
336 void pciehp_queue_pushbutton_work(struct work_struct *work)
338 struct slot *p_slot = container_of(work, struct slot, work.work);
339 struct power_work_info *info;
341 info = kmalloc(sizeof(*info), GFP_KERNEL);
343 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
347 info->p_slot = p_slot;
348 INIT_WORK(&info->work, pciehp_power_thread);
350 mutex_lock(&p_slot->lock);
351 switch (p_slot->state) {
352 case BLINKINGOFF_STATE:
353 p_slot->state = POWEROFF_STATE;
355 case BLINKINGON_STATE:
356 p_slot->state = POWERON_STATE;
361 queue_work(pciehp_wq, &info->work);
363 mutex_unlock(&p_slot->lock);
367 * Note: This function must be called with slot->lock held
369 static void handle_button_press_event(struct slot *p_slot)
371 struct controller *ctrl = p_slot->ctrl;
374 switch (p_slot->state) {
376 pciehp_get_power_status(p_slot, &getstatus);
378 p_slot->state = BLINKINGOFF_STATE;
380 "PCI slot #%s - powering off due to button "
381 "press.\n", slot_name(p_slot));
383 p_slot->state = BLINKINGON_STATE;
385 "PCI slot #%s - powering on due to button "
386 "press.\n", slot_name(p_slot));
388 /* blink green LED and turn off amber */
390 pciehp_green_led_blink(p_slot);
392 pciehp_set_attention_status(p_slot, 0);
394 schedule_delayed_work(&p_slot->work, 5*HZ);
396 case BLINKINGOFF_STATE:
397 case BLINKINGON_STATE:
399 * Cancel if we are still blinking; this means that we
400 * press the attention again before the 5 sec. limit
401 * expires to cancel hot-add or hot-remove
403 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
404 cancel_delayed_work(&p_slot->work);
405 if (p_slot->state == BLINKINGOFF_STATE) {
407 pciehp_green_led_on(p_slot);
410 pciehp_green_led_off(p_slot);
413 pciehp_set_attention_status(p_slot, 0);
414 ctrl_info(ctrl, "PCI slot #%s - action canceled "
415 "due to button press\n", slot_name(p_slot));
416 p_slot->state = STATIC_STATE;
421 * Ignore if the slot is on power-on or power-off state;
422 * this means that the previous attention button action
423 * to hot-add or hot-remove is undergoing
425 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
428 ctrl_warn(ctrl, "Not a valid state\n");
434 * Note: This function must be called with slot->lock held
436 static void handle_surprise_event(struct slot *p_slot)
439 struct power_work_info *info;
441 info = kmalloc(sizeof(*info), GFP_KERNEL);
443 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
447 info->p_slot = p_slot;
448 INIT_WORK(&info->work, pciehp_power_thread);
450 pciehp_get_adapter_status(p_slot, &getstatus);
452 p_slot->state = POWEROFF_STATE;
454 p_slot->state = POWERON_STATE;
456 queue_work(pciehp_wq, &info->work);
459 static void interrupt_event_handler(struct work_struct *work)
461 struct event_info *info = container_of(work, struct event_info, work);
462 struct slot *p_slot = info->p_slot;
463 struct controller *ctrl = p_slot->ctrl;
465 mutex_lock(&p_slot->lock);
466 switch (info->event_type) {
467 case INT_BUTTON_PRESS:
468 handle_button_press_event(p_slot);
470 case INT_POWER_FAULT:
471 if (!POWER_CTRL(ctrl))
474 pciehp_set_attention_status(p_slot, 1);
476 pciehp_green_led_off(p_slot);
478 case INT_PRESENCE_ON:
479 case INT_PRESENCE_OFF:
480 if (!HP_SUPR_RM(ctrl))
482 ctrl_dbg(ctrl, "Surprise Removal\n");
483 handle_surprise_event(p_slot);
488 mutex_unlock(&p_slot->lock);
493 int pciehp_enable_slot(struct slot *p_slot)
497 struct controller *ctrl = p_slot->ctrl;
499 rc = pciehp_get_adapter_status(p_slot, &getstatus);
500 if (rc || !getstatus) {
501 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
504 if (MRL_SENS(p_slot->ctrl)) {
505 rc = pciehp_get_latch_status(p_slot, &getstatus);
506 if (rc || getstatus) {
507 ctrl_info(ctrl, "Latch open on slot(%s)\n",
513 if (POWER_CTRL(p_slot->ctrl)) {
514 rc = pciehp_get_power_status(p_slot, &getstatus);
515 if (rc || getstatus) {
516 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
522 pciehp_get_latch_status(p_slot, &getstatus);
524 rc = board_added(p_slot);
526 pciehp_get_latch_status(p_slot, &getstatus);
532 int pciehp_disable_slot(struct slot *p_slot)
536 struct controller *ctrl = p_slot->ctrl;
541 if (!HP_SUPR_RM(p_slot->ctrl)) {
542 ret = pciehp_get_adapter_status(p_slot, &getstatus);
543 if (ret || !getstatus) {
544 ctrl_info(ctrl, "No adapter on slot(%s)\n",
550 if (MRL_SENS(p_slot->ctrl)) {
551 ret = pciehp_get_latch_status(p_slot, &getstatus);
552 if (ret || getstatus) {
553 ctrl_info(ctrl, "Latch open on slot(%s)\n",
559 if (POWER_CTRL(p_slot->ctrl)) {
560 ret = pciehp_get_power_status(p_slot, &getstatus);
561 if (ret || !getstatus) {
562 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
568 return remove_board(p_slot);
571 int pciehp_sysfs_enable_slot(struct slot *p_slot)
573 int retval = -ENODEV;
574 struct controller *ctrl = p_slot->ctrl;
576 mutex_lock(&p_slot->lock);
577 switch (p_slot->state) {
578 case BLINKINGON_STATE:
579 cancel_delayed_work(&p_slot->work);
581 p_slot->state = POWERON_STATE;
582 mutex_unlock(&p_slot->lock);
583 retval = pciehp_enable_slot(p_slot);
584 mutex_lock(&p_slot->lock);
585 p_slot->state = STATIC_STATE;
588 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
591 case BLINKINGOFF_STATE:
593 ctrl_info(ctrl, "Already enabled on slot %s\n",
597 ctrl_err(ctrl, "Not a valid state on slot %s\n",
601 mutex_unlock(&p_slot->lock);
606 int pciehp_sysfs_disable_slot(struct slot *p_slot)
608 int retval = -ENODEV;
609 struct controller *ctrl = p_slot->ctrl;
611 mutex_lock(&p_slot->lock);
612 switch (p_slot->state) {
613 case BLINKINGOFF_STATE:
614 cancel_delayed_work(&p_slot->work);
616 p_slot->state = POWEROFF_STATE;
617 mutex_unlock(&p_slot->lock);
618 retval = pciehp_disable_slot(p_slot);
619 mutex_lock(&p_slot->lock);
620 p_slot->state = STATIC_STATE;
623 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
626 case BLINKINGON_STATE:
628 ctrl_info(ctrl, "Already disabled on slot %s\n",
632 ctrl_err(ctrl, "Not a valid state on slot %s\n",
636 mutex_unlock(&p_slot->lock);