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/smp_lock.h>
34 #include <linux/pci.h>
35 #include <linux/workqueue.h>
39 static void interrupt_event_handler(struct work_struct *work);
40 static int shpchp_enable_slot(struct slot *p_slot);
41 static int shpchp_disable_slot(struct slot *p_slot);
43 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
45 struct event_info *info;
47 info = kmalloc(sizeof(*info), GFP_ATOMIC);
51 info->event_type = event_type;
52 info->p_slot = p_slot;
53 INIT_WORK(&info->work, interrupt_event_handler);
55 schedule_work(&info->work);
60 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
65 /* Attention Button Change */
66 dbg("shpchp: Attention button interrupt received.\n");
68 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
69 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
72 * Button pressed - See if need to TAKE ACTION!!!
74 info("Button pressed on Slot(%s)\n", p_slot->name);
75 event_type = INT_BUTTON_PRESS;
77 queue_interrupt_event(p_slot, event_type);
83 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
90 dbg("shpchp: Switch interrupt received.\n");
92 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
93 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
94 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
95 dbg("%s: Card present %x Power status %x\n", __FUNCTION__,
96 p_slot->presence_save, p_slot->pwr_save);
102 info("Latch open on Slot(%s)\n", p_slot->name);
103 event_type = INT_SWITCH_OPEN;
104 if (p_slot->pwr_save && p_slot->presence_save) {
105 event_type = INT_POWER_FAULT;
106 err("Surprise Removal of card\n");
112 info("Latch close on Slot(%s)\n", p_slot->name);
113 event_type = INT_SWITCH_CLOSE;
116 queue_interrupt_event(p_slot, event_type);
121 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
126 /* Presence Change */
127 dbg("shpchp: Presence/Notify input change.\n");
129 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
132 * Save the presence state
134 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
135 if (p_slot->presence_save) {
139 info("Card present on Slot(%s)\n", p_slot->name);
140 event_type = INT_PRESENCE_ON;
145 info("Card not present on Slot(%s)\n", p_slot->name);
146 event_type = INT_PRESENCE_OFF;
149 queue_interrupt_event(p_slot, event_type);
154 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
160 dbg("shpchp: Power fault interrupt received.\n");
162 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
164 if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
166 * Power fault Cleared
168 info("Power fault cleared on Slot(%s)\n", p_slot->name);
169 p_slot->status = 0x00;
170 event_type = INT_POWER_FAULT_CLEAR;
175 info("Power fault on Slot(%s)\n", p_slot->name);
176 event_type = INT_POWER_FAULT;
177 /* set power fault status for this board */
178 p_slot->status = 0xFF;
179 info("power fault bit %x set\n", hp_slot);
182 queue_interrupt_event(p_slot, event_type);
187 /* The following routines constitute the bulk of the
188 hotplug controller logic
190 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
191 enum pci_bus_speed speed)
195 dbg("%s: change to speed %d\n", __FUNCTION__, speed);
196 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
197 err("%s: Issue of set bus speed mode command failed\n",
199 return WRONG_BUS_FREQUENCY;
204 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
205 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
206 enum pci_bus_speed msp)
211 * If other slots on the same bus are occupied, we cannot
212 * change the bus speed.
216 err("%s: speed of bus %x and adapter %x mismatch\n",
217 __FUNCTION__, bsp, asp);
218 rc = WRONG_BUS_FREQUENCY;
225 rc = change_bus_speed(ctrl, pslot, asp);
228 rc = change_bus_speed(ctrl, pslot, msp);
234 * board_added - Called after a board has been added to the system.
236 * Turns power on for the board
240 static int board_added(struct slot *p_slot)
243 u8 slots_not_empty = 0;
245 enum pci_bus_speed asp, bsp, msp;
246 struct controller *ctrl = p_slot->ctrl;
248 hp_slot = p_slot->device - ctrl->slot_device_offset;
250 dbg("%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
251 __FUNCTION__, p_slot->device,
252 ctrl->slot_device_offset, hp_slot);
254 /* Power on slot without connecting to bus */
255 rc = p_slot->hpc_ops->power_on_slot(p_slot);
257 err("%s: Failed to power on slot\n", __FUNCTION__);
261 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
263 return WRONG_BUS_FREQUENCY;
265 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
266 err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
267 return WRONG_BUS_FREQUENCY;
270 /* turn on board, blink green LED, turn off Amber LED */
271 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
272 err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
277 rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
279 err("%s: Can't get adapter speed or bus mode mismatch\n",
281 return WRONG_BUS_FREQUENCY;
284 rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bsp);
286 err("%s: Can't get bus operation speed\n", __FUNCTION__);
287 return WRONG_BUS_FREQUENCY;
290 rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &msp);
292 err("%s: Can't get max bus operation speed\n", __FUNCTION__);
296 /* Check if there are other slots or devices on the same bus */
297 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
300 dbg("%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, "
301 "max_bus_speed %d\n", __FUNCTION__, slots_not_empty, asp,
304 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
308 /* turn on board, blink green LED, turn off Amber LED */
309 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
310 err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
314 /* Wait for ~1 second */
317 dbg("%s: slot status = %x\n", __FUNCTION__, p_slot->status);
318 /* Check for a power fault */
319 if (p_slot->status == 0xFF) {
320 /* power fault occurred, but it was benign */
321 dbg("%s: power fault\n", __FUNCTION__);
327 if (shpchp_configure_device(p_slot)) {
328 err("Cannot add device at 0x%x:0x%x\n", p_slot->bus,
334 p_slot->is_a_board = 0x01;
335 p_slot->pwr_save = 1;
337 p_slot->hpc_ops->green_led_on(p_slot);
342 /* turn off slot, turn on Amber LED, turn off Green LED */
343 rc = p_slot->hpc_ops->slot_disable(p_slot);
345 err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
354 * remove_board - Turns off slot and LED's
357 static int remove_board(struct slot *p_slot)
359 struct controller *ctrl = p_slot->ctrl;
363 if (shpchp_unconfigure_device(p_slot))
366 hp_slot = p_slot->device - ctrl->slot_device_offset;
367 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
369 dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
371 /* Change status to shutdown */
372 if (p_slot->is_a_board)
373 p_slot->status = 0x01;
375 /* turn off slot, turn on Amber LED, turn off Green LED */
376 rc = p_slot->hpc_ops->slot_disable(p_slot);
378 err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
382 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
384 err("%s: Issue of Set Attention command failed\n", __FUNCTION__);
388 p_slot->pwr_save = 0;
389 p_slot->is_a_board = 0;
395 struct pushbutton_work_info {
397 struct work_struct work;
401 * shpchp_pushbutton_thread
403 * Scheduled procedure to handle blocking stuff for the pushbuttons
404 * Handles all pending events and exits.
407 static void shpchp_pushbutton_thread(struct work_struct *work)
409 struct pushbutton_work_info *info =
410 container_of(work, struct pushbutton_work_info, work);
411 struct slot *p_slot = info->p_slot;
413 mutex_lock(&p_slot->lock);
414 switch (p_slot->state) {
416 mutex_unlock(&p_slot->lock);
417 shpchp_disable_slot(p_slot);
418 mutex_lock(&p_slot->lock);
419 p_slot->state = STATIC_STATE;
422 mutex_unlock(&p_slot->lock);
423 if (shpchp_enable_slot(p_slot))
424 p_slot->hpc_ops->green_led_off(p_slot);
425 mutex_lock(&p_slot->lock);
426 p_slot->state = STATIC_STATE;
431 mutex_unlock(&p_slot->lock);
436 void shpchp_queue_pushbutton_work(struct work_struct *work)
438 struct slot *p_slot = container_of(work, struct slot, work.work);
439 struct pushbutton_work_info *info;
441 info = kmalloc(sizeof(*info), GFP_KERNEL);
443 err("%s: Cannot allocate memory\n", __FUNCTION__);
446 info->p_slot = p_slot;
447 INIT_WORK(&info->work, shpchp_pushbutton_thread);
449 mutex_lock(&p_slot->lock);
450 switch (p_slot->state) {
451 case BLINKINGOFF_STATE:
452 p_slot->state = POWEROFF_STATE;
454 case BLINKINGON_STATE:
455 p_slot->state = POWERON_STATE;
460 queue_work(shpchp_wq, &info->work);
462 mutex_unlock(&p_slot->lock);
465 static int update_slot_info (struct slot *slot)
467 struct hotplug_slot_info *info;
470 info = kmalloc(sizeof(*info), GFP_KERNEL);
474 slot->hpc_ops->get_power_status(slot, &(info->power_status));
475 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
476 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
477 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
479 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
485 * Note: This function must be called with slot->lock held
487 static void handle_button_press_event(struct slot *p_slot)
491 switch (p_slot->state) {
493 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
495 p_slot->state = BLINKINGOFF_STATE;
496 info("PCI slot #%s - powering off due to button "
497 "press.\n", p_slot->name);
499 p_slot->state = BLINKINGON_STATE;
500 info("PCI slot #%s - powering on due to button "
501 "press.\n", p_slot->name);
503 /* blink green LED and turn off amber */
504 p_slot->hpc_ops->green_led_blink(p_slot);
505 p_slot->hpc_ops->set_attention_status(p_slot, 0);
507 schedule_delayed_work(&p_slot->work, 5*HZ);
509 case BLINKINGOFF_STATE:
510 case BLINKINGON_STATE:
512 * Cancel if we are still blinking; this means that we
513 * press the attention again before the 5 sec. limit
514 * expires to cancel hot-add or hot-remove
516 info("Button cancel on Slot(%s)\n", p_slot->name);
517 dbg("%s: button cancel\n", __FUNCTION__);
518 cancel_delayed_work(&p_slot->work);
519 if (p_slot->state == BLINKINGOFF_STATE)
520 p_slot->hpc_ops->green_led_on(p_slot);
522 p_slot->hpc_ops->green_led_off(p_slot);
523 p_slot->hpc_ops->set_attention_status(p_slot, 0);
524 info("PCI slot #%s - action canceled due to button press\n",
526 p_slot->state = STATIC_STATE;
531 * Ignore if the slot is on power-on or power-off state;
532 * this means that the previous attention button action
533 * to hot-add or hot-remove is undergoing
535 info("Button ignore on Slot(%s)\n", p_slot->name);
536 update_slot_info(p_slot);
539 warn("Not a valid state\n");
544 static void interrupt_event_handler(struct work_struct *work)
546 struct event_info *info = container_of(work, struct event_info, work);
547 struct slot *p_slot = info->p_slot;
549 mutex_lock(&p_slot->lock);
550 switch (info->event_type) {
551 case INT_BUTTON_PRESS:
552 handle_button_press_event(p_slot);
554 case INT_POWER_FAULT:
555 dbg("%s: power fault\n", __FUNCTION__);
556 p_slot->hpc_ops->set_attention_status(p_slot, 1);
557 p_slot->hpc_ops->green_led_off(p_slot);
560 update_slot_info(p_slot);
563 mutex_unlock(&p_slot->lock);
569 static int shpchp_enable_slot (struct slot *p_slot)
572 int rc, retval = -ENODEV;
574 /* Check to see if (latch closed, card present, power off) */
575 mutex_lock(&p_slot->ctrl->crit_sect);
576 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
577 if (rc || !getstatus) {
578 info("No adapter on slot(%s)\n", p_slot->name);
581 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
582 if (rc || getstatus) {
583 info("Latch open on slot(%s)\n", p_slot->name);
586 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
587 if (rc || getstatus) {
588 info("Already enabled on slot(%s)\n", p_slot->name);
592 p_slot->is_a_board = 1;
594 /* We have to save the presence info for these slots */
595 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
596 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
597 dbg("%s: p_slot->pwr_save %x\n", __FUNCTION__, p_slot->pwr_save);
598 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
600 if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
601 (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
602 && p_slot->ctrl->num_slots == 1) {
603 /* handle amd pogo errata; this must be done before enable */
604 amd_pogo_errata_save_misc_reg(p_slot);
605 retval = board_added(p_slot);
606 /* handle amd pogo errata; this must be done after enable */
607 amd_pogo_errata_restore_misc_reg(p_slot);
609 retval = board_added(p_slot);
612 p_slot->hpc_ops->get_adapter_status(p_slot,
613 &(p_slot->presence_save));
614 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
617 update_slot_info(p_slot);
619 mutex_unlock(&p_slot->ctrl->crit_sect);
624 static int shpchp_disable_slot (struct slot *p_slot)
627 int rc, retval = -ENODEV;
632 /* Check to see if (latch closed, card present, power on) */
633 mutex_lock(&p_slot->ctrl->crit_sect);
635 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
636 if (rc || !getstatus) {
637 info("No adapter on slot(%s)\n", p_slot->name);
640 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
641 if (rc || getstatus) {
642 info("Latch open on slot(%s)\n", p_slot->name);
645 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
646 if (rc || !getstatus) {
647 info("Already disabled slot(%s)\n", p_slot->name);
651 retval = remove_board(p_slot);
652 update_slot_info(p_slot);
654 mutex_unlock(&p_slot->ctrl->crit_sect);
658 int shpchp_sysfs_enable_slot(struct slot *p_slot)
660 int retval = -ENODEV;
662 mutex_lock(&p_slot->lock);
663 switch (p_slot->state) {
664 case BLINKINGON_STATE:
665 cancel_delayed_work(&p_slot->work);
667 p_slot->state = POWERON_STATE;
668 mutex_unlock(&p_slot->lock);
669 retval = shpchp_enable_slot(p_slot);
670 mutex_lock(&p_slot->lock);
671 p_slot->state = STATIC_STATE;
674 info("Slot %s is already in powering on state\n",
677 case BLINKINGOFF_STATE:
679 info("Already enabled on slot %s\n", p_slot->name);
682 err("Not a valid state on slot %s\n", p_slot->name);
685 mutex_unlock(&p_slot->lock);
690 int shpchp_sysfs_disable_slot(struct slot *p_slot)
692 int retval = -ENODEV;
694 mutex_lock(&p_slot->lock);
695 switch (p_slot->state) {
696 case BLINKINGOFF_STATE:
697 cancel_delayed_work(&p_slot->work);
699 p_slot->state = POWEROFF_STATE;
700 mutex_unlock(&p_slot->lock);
701 retval = shpchp_disable_slot(p_slot);
702 mutex_lock(&p_slot->lock);
703 p_slot->state = STATIC_STATE;
706 info("Slot %s is already in powering off state\n",
709 case BLINKINGON_STATE:
711 info("Already disabled on slot %s\n", p_slot->name);
714 err("Not a valid state on slot %s\n", p_slot->name);
717 mutex_unlock(&p_slot->lock);