2 * Standard 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);
39 static int shpchp_enable_slot(struct slot *p_slot);
40 static int shpchp_disable_slot(struct slot *p_slot);
42 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
44 struct event_info *info;
46 info = kmalloc(sizeof(*info), GFP_ATOMIC);
50 info->event_type = event_type;
51 info->p_slot = p_slot;
52 INIT_WORK(&info->work, interrupt_event_handler);
54 schedule_work(&info->work);
59 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
64 /* Attention Button Change */
65 dbg("shpchp: Attention button interrupt received.\n");
67 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
68 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
71 * Button pressed - See if need to TAKE ACTION!!!
73 info("Button pressed on Slot(%s)\n", slot_name(p_slot));
74 event_type = INT_BUTTON_PRESS;
76 queue_interrupt_event(p_slot, event_type);
82 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
89 dbg("shpchp: Switch interrupt received.\n");
91 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
92 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
93 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
94 dbg("%s: Card present %x Power status %x\n", __func__,
95 p_slot->presence_save, p_slot->pwr_save);
101 info("Latch open on Slot(%s)\n", slot_name(p_slot));
102 event_type = INT_SWITCH_OPEN;
103 if (p_slot->pwr_save && p_slot->presence_save) {
104 event_type = INT_POWER_FAULT;
105 err("Surprise Removal of card\n");
111 info("Latch close on Slot(%s)\n", slot_name(p_slot));
112 event_type = INT_SWITCH_CLOSE;
115 queue_interrupt_event(p_slot, event_type);
120 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
125 /* Presence Change */
126 dbg("shpchp: Presence/Notify input change.\n");
128 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
131 * Save the presence state
133 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
134 if (p_slot->presence_save) {
138 info("Card present on Slot(%s)\n", slot_name(p_slot));
139 event_type = INT_PRESENCE_ON;
144 info("Card not present on Slot(%s)\n", slot_name(p_slot));
145 event_type = INT_PRESENCE_OFF;
148 queue_interrupt_event(p_slot, event_type);
153 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
159 dbg("shpchp: Power fault interrupt received.\n");
161 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
163 if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
165 * Power fault Cleared
167 info("Power fault cleared on Slot(%s)\n", slot_name(p_slot));
168 p_slot->status = 0x00;
169 event_type = INT_POWER_FAULT_CLEAR;
174 info("Power fault on Slot(%s)\n", slot_name(p_slot));
175 event_type = INT_POWER_FAULT;
176 /* set power fault status for this board */
177 p_slot->status = 0xFF;
178 info("power fault bit %x set\n", hp_slot);
181 queue_interrupt_event(p_slot, event_type);
186 /* The following routines constitute the bulk of the
187 hotplug controller logic
189 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
190 enum pci_bus_speed speed)
194 dbg("%s: change to speed %d\n", __func__, speed);
195 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
196 err("%s: Issue of set bus speed mode command failed\n",
198 return WRONG_BUS_FREQUENCY;
203 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
204 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
205 enum pci_bus_speed msp)
210 * If other slots on the same bus are occupied, we cannot
211 * change the bus speed.
215 err("%s: speed of bus %x and adapter %x mismatch\n",
217 rc = WRONG_BUS_FREQUENCY;
224 rc = change_bus_speed(ctrl, pslot, asp);
227 rc = change_bus_speed(ctrl, pslot, msp);
233 * board_added - Called after a board has been added to the system.
234 * @p_slot: target &slot
236 * Turns power on for the board.
239 static int board_added(struct slot *p_slot)
242 u8 slots_not_empty = 0;
244 enum pci_bus_speed asp, bsp, msp;
245 struct controller *ctrl = p_slot->ctrl;
247 hp_slot = p_slot->device - ctrl->slot_device_offset;
249 dbg("%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
250 __func__, p_slot->device,
251 ctrl->slot_device_offset, hp_slot);
253 /* Power on slot without connecting to bus */
254 rc = p_slot->hpc_ops->power_on_slot(p_slot);
256 err("%s: Failed to power on slot\n", __func__);
260 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
262 return WRONG_BUS_FREQUENCY;
264 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
265 err("%s: Issue of set bus speed mode command failed\n", __func__);
266 return WRONG_BUS_FREQUENCY;
269 /* turn on board, blink green LED, turn off Amber LED */
270 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
271 err("%s: Issue of Slot Enable command failed\n", __func__);
276 rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
278 err("%s: Can't get adapter speed or bus mode mismatch\n",
280 return WRONG_BUS_FREQUENCY;
283 rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bsp);
285 err("%s: Can't get bus operation speed\n", __func__);
286 return WRONG_BUS_FREQUENCY;
289 rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &msp);
291 err("%s: Can't get max bus operation speed\n", __func__);
295 /* Check if there are other slots or devices on the same bus */
296 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
299 dbg("%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, "
300 "max_bus_speed %d\n", __func__, slots_not_empty, asp,
303 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
307 /* turn on board, blink green LED, turn off Amber LED */
308 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
309 err("%s: Issue of Slot Enable command failed\n", __func__);
313 /* Wait for ~1 second */
316 dbg("%s: slot status = %x\n", __func__, p_slot->status);
317 /* Check for a power fault */
318 if (p_slot->status == 0xFF) {
319 /* power fault occurred, but it was benign */
320 dbg("%s: power fault\n", __func__);
326 if (shpchp_configure_device(p_slot)) {
327 err("Cannot add device at 0x%x:0x%x\n", p_slot->bus,
333 p_slot->is_a_board = 0x01;
334 p_slot->pwr_save = 1;
336 p_slot->hpc_ops->green_led_on(p_slot);
341 /* turn off slot, turn on Amber LED, turn off Green LED */
342 rc = p_slot->hpc_ops->slot_disable(p_slot);
344 err("%s: Issue of Slot Disable command failed\n", __func__);
353 * remove_board - Turns off slot and LEDs
354 * @p_slot: target &slot
356 static int remove_board(struct slot *p_slot)
358 struct controller *ctrl = p_slot->ctrl;
362 if (shpchp_unconfigure_device(p_slot))
365 hp_slot = p_slot->device - ctrl->slot_device_offset;
366 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
368 dbg("In %s, hp_slot = %d\n", __func__, hp_slot);
370 /* Change status to shutdown */
371 if (p_slot->is_a_board)
372 p_slot->status = 0x01;
374 /* turn off slot, turn on Amber LED, turn off Green LED */
375 rc = p_slot->hpc_ops->slot_disable(p_slot);
377 err("%s: Issue of Slot Disable command failed\n", __func__);
381 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
383 err("%s: Issue of Set Attention command failed\n", __func__);
387 p_slot->pwr_save = 0;
388 p_slot->is_a_board = 0;
394 struct pushbutton_work_info {
396 struct work_struct work;
400 * shpchp_pushbutton_thread - handle pushbutton events
401 * @work: &struct work_struct to be handled
403 * Scheduled procedure to handle blocking stuff for the pushbuttons.
404 * Handles all pending events and exits.
406 static void shpchp_pushbutton_thread(struct work_struct *work)
408 struct pushbutton_work_info *info =
409 container_of(work, struct pushbutton_work_info, work);
410 struct slot *p_slot = info->p_slot;
412 mutex_lock(&p_slot->lock);
413 switch (p_slot->state) {
415 mutex_unlock(&p_slot->lock);
416 shpchp_disable_slot(p_slot);
417 mutex_lock(&p_slot->lock);
418 p_slot->state = STATIC_STATE;
421 mutex_unlock(&p_slot->lock);
422 if (shpchp_enable_slot(p_slot))
423 p_slot->hpc_ops->green_led_off(p_slot);
424 mutex_lock(&p_slot->lock);
425 p_slot->state = STATIC_STATE;
430 mutex_unlock(&p_slot->lock);
435 void shpchp_queue_pushbutton_work(struct work_struct *work)
437 struct slot *p_slot = container_of(work, struct slot, work.work);
438 struct pushbutton_work_info *info;
440 info = kmalloc(sizeof(*info), GFP_KERNEL);
442 err("%s: Cannot allocate memory\n", __func__);
445 info->p_slot = p_slot;
446 INIT_WORK(&info->work, shpchp_pushbutton_thread);
448 mutex_lock(&p_slot->lock);
449 switch (p_slot->state) {
450 case BLINKINGOFF_STATE:
451 p_slot->state = POWEROFF_STATE;
453 case BLINKINGON_STATE:
454 p_slot->state = POWERON_STATE;
459 queue_work(shpchp_wq, &info->work);
461 mutex_unlock(&p_slot->lock);
464 static int update_slot_info (struct slot *slot)
466 struct hotplug_slot_info *info;
469 info = kmalloc(sizeof(*info), GFP_KERNEL);
473 slot->hpc_ops->get_power_status(slot, &(info->power_status));
474 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
475 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
476 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
478 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
484 * Note: This function must be called with slot->lock held
486 static void handle_button_press_event(struct slot *p_slot)
490 switch (p_slot->state) {
492 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
494 p_slot->state = BLINKINGOFF_STATE;
495 info("PCI slot #%s - powering off due to button "
496 "press.\n", slot_name(p_slot));
498 p_slot->state = BLINKINGON_STATE;
499 info("PCI slot #%s - powering on due to button "
500 "press.\n", slot_name(p_slot));
502 /* blink green LED and turn off amber */
503 p_slot->hpc_ops->green_led_blink(p_slot);
504 p_slot->hpc_ops->set_attention_status(p_slot, 0);
506 schedule_delayed_work(&p_slot->work, 5*HZ);
508 case BLINKINGOFF_STATE:
509 case BLINKINGON_STATE:
511 * Cancel if we are still blinking; this means that we
512 * press the attention again before the 5 sec. limit
513 * expires to cancel hot-add or hot-remove
515 info("Button cancel on Slot(%s)\n", slot_name(p_slot));
516 dbg("%s: button cancel\n", __func__);
517 cancel_delayed_work(&p_slot->work);
518 if (p_slot->state == BLINKINGOFF_STATE)
519 p_slot->hpc_ops->green_led_on(p_slot);
521 p_slot->hpc_ops->green_led_off(p_slot);
522 p_slot->hpc_ops->set_attention_status(p_slot, 0);
523 info("PCI slot #%s - action canceled due to button press\n",
525 p_slot->state = STATIC_STATE;
530 * Ignore if the slot is on power-on or power-off state;
531 * this means that the previous attention button action
532 * to hot-add or hot-remove is undergoing
534 info("Button ignore on Slot(%s)\n", slot_name(p_slot));
535 update_slot_info(p_slot);
538 warn("Not a valid state\n");
543 static void interrupt_event_handler(struct work_struct *work)
545 struct event_info *info = container_of(work, struct event_info, work);
546 struct slot *p_slot = info->p_slot;
548 mutex_lock(&p_slot->lock);
549 switch (info->event_type) {
550 case INT_BUTTON_PRESS:
551 handle_button_press_event(p_slot);
553 case INT_POWER_FAULT:
554 dbg("%s: power fault\n", __func__);
555 p_slot->hpc_ops->set_attention_status(p_slot, 1);
556 p_slot->hpc_ops->green_led_off(p_slot);
559 update_slot_info(p_slot);
562 mutex_unlock(&p_slot->lock);
568 static int shpchp_enable_slot (struct slot *p_slot)
571 int rc, retval = -ENODEV;
573 /* Check to see if (latch closed, card present, power off) */
574 mutex_lock(&p_slot->ctrl->crit_sect);
575 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
576 if (rc || !getstatus) {
577 info("No adapter on slot(%s)\n", slot_name(p_slot));
580 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
581 if (rc || getstatus) {
582 info("Latch open on slot(%s)\n", slot_name(p_slot));
585 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
586 if (rc || getstatus) {
587 info("Already enabled on slot(%s)\n", slot_name(p_slot));
591 p_slot->is_a_board = 1;
593 /* We have to save the presence info for these slots */
594 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
595 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
596 dbg("%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
597 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
599 if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
600 (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
601 && p_slot->ctrl->num_slots == 1) {
602 /* handle amd pogo errata; this must be done before enable */
603 amd_pogo_errata_save_misc_reg(p_slot);
604 retval = board_added(p_slot);
605 /* handle amd pogo errata; this must be done after enable */
606 amd_pogo_errata_restore_misc_reg(p_slot);
608 retval = board_added(p_slot);
611 p_slot->hpc_ops->get_adapter_status(p_slot,
612 &(p_slot->presence_save));
613 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
616 update_slot_info(p_slot);
618 mutex_unlock(&p_slot->ctrl->crit_sect);
623 static int shpchp_disable_slot (struct slot *p_slot)
626 int rc, retval = -ENODEV;
631 /* Check to see if (latch closed, card present, power on) */
632 mutex_lock(&p_slot->ctrl->crit_sect);
634 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
635 if (rc || !getstatus) {
636 info("No adapter on slot(%s)\n", slot_name(p_slot));
639 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
640 if (rc || getstatus) {
641 info("Latch open on slot(%s)\n", slot_name(p_slot));
644 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
645 if (rc || !getstatus) {
646 info("Already disabled slot(%s)\n", slot_name(p_slot));
650 retval = remove_board(p_slot);
651 update_slot_info(p_slot);
653 mutex_unlock(&p_slot->ctrl->crit_sect);
657 int shpchp_sysfs_enable_slot(struct slot *p_slot)
659 int retval = -ENODEV;
661 mutex_lock(&p_slot->lock);
662 switch (p_slot->state) {
663 case BLINKINGON_STATE:
664 cancel_delayed_work(&p_slot->work);
666 p_slot->state = POWERON_STATE;
667 mutex_unlock(&p_slot->lock);
668 retval = shpchp_enable_slot(p_slot);
669 mutex_lock(&p_slot->lock);
670 p_slot->state = STATIC_STATE;
673 info("Slot %s is already in powering on state\n",
676 case BLINKINGOFF_STATE:
678 info("Already enabled on slot %s\n", slot_name(p_slot));
681 err("Not a valid state on slot %s\n", slot_name(p_slot));
684 mutex_unlock(&p_slot->lock);
689 int shpchp_sysfs_disable_slot(struct slot *p_slot)
691 int retval = -ENODEV;
693 mutex_lock(&p_slot->lock);
694 switch (p_slot->state) {
695 case BLINKINGOFF_STATE:
696 cancel_delayed_work(&p_slot->work);
698 p_slot->state = POWEROFF_STATE;
699 mutex_unlock(&p_slot->lock);
700 retval = shpchp_disable_slot(p_slot);
701 mutex_lock(&p_slot->lock);
702 p_slot->state = STATIC_STATE;
705 info("Slot %s is already in powering off state\n",
708 case BLINKINGON_STATE:
710 info("Already disabled on slot %s\n", slot_name(p_slot));
713 err("Not a valid state on slot %s\n", slot_name(p_slot));
716 mutex_unlock(&p_slot->lock);