[PATCH] pciehp: reduce dependence on ACPI

[mirror_ubuntu-bionic-kernel.git] / drivers / pci / hotplug / pciehp_ctrl.c

/*
 * PCI Express Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 Intel Corporation
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/smp_lock.h>
#include <linux/pci.h>
#include "../pci.h"
#include "pciehp.h"

static void interrupt_event_handler(struct controller *ctrl);

static struct semaphore event_semaphore;	/* mutex for process loop (up if something to process) */
static struct semaphore event_exit;		/* guard ensure thread has exited before calling it quits */
static int event_finished;
static unsigned long pushbutton_pending;	/* = 0 */
static unsigned long surprise_rm_pending;	/* = 0 */

u8 pciehp_handle_attention_button(u8 hp_slot, void *inst_id)
{
	struct controller *ctrl = (struct controller *) inst_id;
	struct slot *p_slot;
	u8 rc = 0;
	u8 getstatus;
	struct pci_func *func;
	struct event_info *taskInfo;

	/* Attention Button Change */
	dbg("pciehp:  Attention button interrupt received.\n");
	
	func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);

	/* This is the structure that tells the worker thread what to do */
	taskInfo = &(ctrl->event_queue[ctrl->next_event]);
	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	
	ctrl->next_event = (ctrl->next_event + 1) % 10;
	taskInfo->hp_slot = hp_slot;

	rc++;

	/*
	 *  Button pressed - See if need to TAKE ACTION!!!
	 */
	info("Button pressed on Slot(%d)\n", ctrl->first_slot + hp_slot);
	taskInfo->event_type = INT_BUTTON_PRESS;

	if ((p_slot->state == BLINKINGON_STATE)
	    || (p_slot->state == BLINKINGOFF_STATE)) {
		/* Cancel if we are still blinking; this means that we press the
		 * attention again before the 5 sec. limit expires to cancel hot-add
		 * or hot-remove
		 */
		taskInfo->event_type = INT_BUTTON_CANCEL;
		info("Button cancel on Slot(%d)\n", ctrl->first_slot + hp_slot);
	} else if ((p_slot->state == POWERON_STATE)
		   || (p_slot->state == POWEROFF_STATE)) {
		/* Ignore if the slot is on power-on or power-off state; this 
		 * means that the previous attention button action to hot-add or
		 * hot-remove is undergoing
		 */
		taskInfo->event_type = INT_BUTTON_IGNORE;
		info("Button ignore on Slot(%d)\n", ctrl->first_slot + hp_slot);
	}

	if (rc)
		up(&event_semaphore);	/* signal event thread that new event is posted */

	return 0;

}

u8 pciehp_handle_switch_change(u8 hp_slot, void *inst_id)
{
	struct controller *ctrl = (struct controller *) inst_id;
	struct slot *p_slot;
	u8 rc = 0;
	u8 getstatus;
	struct pci_func *func;
	struct event_info *taskInfo;

	/* Switch Change */
	dbg("pciehp:  Switch interrupt received.\n");

	func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);

	/* This is the structure that tells the worker thread
	 * what to do
	 */
	taskInfo = &(ctrl->event_queue[ctrl->next_event]);
	ctrl->next_event = (ctrl->next_event + 1) % 10;
	taskInfo->hp_slot = hp_slot;

	rc++;
	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
	p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

	if (getstatus) {
		/*
		 * Switch opened
		 */
		info("Latch open on Slot(%d)\n", ctrl->first_slot + hp_slot);
		func->switch_save = 0;
		taskInfo->event_type = INT_SWITCH_OPEN;
	} else {
		/*
		 *  Switch closed
		 */
		info("Latch close on Slot(%d)\n", ctrl->first_slot + hp_slot);
		func->switch_save = 0x10;
		taskInfo->event_type = INT_SWITCH_CLOSE;
	}

	if (rc)
		up(&event_semaphore);	/* signal event thread that new event is posted */

	return rc;
}

u8 pciehp_handle_presence_change(u8 hp_slot, void *inst_id)
{
	struct controller *ctrl = (struct controller *) inst_id;
	struct slot *p_slot;
	u8 rc = 0;
	struct pci_func *func;
	struct event_info *taskInfo;

	/* Presence Change */
	dbg("pciehp:  Presence/Notify input change.\n");

	func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);

	/* This is the structure that tells the worker thread
	 * what to do
	 */
	taskInfo = &(ctrl->event_queue[ctrl->next_event]);
	ctrl->next_event = (ctrl->next_event + 1) % 10;
	taskInfo->hp_slot = hp_slot;

	rc++;
	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	/* Switch is open, assume a presence change
	 * Save the presence state
	 */
	p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
	if (func->presence_save) {
		/*
		 * Card Present
		 */
		info("Card present on Slot(%d)\n", ctrl->first_slot + hp_slot);
		taskInfo->event_type = INT_PRESENCE_ON;
	} else {
		/*
		 * Not Present
		 */
		info("Card not present on Slot(%d)\n", ctrl->first_slot + hp_slot);
		taskInfo->event_type = INT_PRESENCE_OFF;
	}

	if (rc)
		up(&event_semaphore);	/* signal event thread that new event is posted */

	return rc;
}

u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
{
	struct controller *ctrl = (struct controller *) inst_id;
	struct slot *p_slot;
	u8 rc = 0;
	struct pci_func *func;
	struct event_info *taskInfo;

	/* power fault */
	dbg("pciehp:  Power fault interrupt received.\n");

	func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);

	/* this is the structure that tells the worker thread
	 * what to do
	 */
	taskInfo = &(ctrl->event_queue[ctrl->next_event]);
	ctrl->next_event = (ctrl->next_event + 1) % 10;
	taskInfo->hp_slot = hp_slot;

	rc++;
	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
		/*
		 * power fault Cleared
		 */
		info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
		func->status = 0x00;
		taskInfo->event_type = INT_POWER_FAULT_CLEAR;
	} else {
		/*
		 *   power fault
		 */
		info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
		taskInfo->event_type = INT_POWER_FAULT;
		/* set power fault status for this board */
		func->status = 0xFF;
		info("power fault bit %x set\n", hp_slot);
	}
	if (rc)
		up(&event_semaphore);	/* signal event thread that new event is posted */

	return rc;
}

/**
 * pciehp_slot_create - Creates a node and adds it to the proper bus.
 * @busnumber - bus where new node is to be located
 *
 * Returns pointer to the new node or NULL if unsuccessful
 */
struct pci_func *pciehp_slot_create(u8 busnumber)
{
	struct pci_func *new_slot;
	struct pci_func *next;
	dbg("%s: busnumber %x\n", __FUNCTION__, busnumber);
	new_slot = kmalloc(sizeof(struct pci_func), GFP_KERNEL);

	if (new_slot == NULL)
		return new_slot;

	memset(new_slot, 0, sizeof(struct pci_func));

	new_slot->next = NULL;
	new_slot->configured = 1;

	if (pciehp_slot_list[busnumber] == NULL) {
		pciehp_slot_list[busnumber] = new_slot;
	} else {
		next = pciehp_slot_list[busnumber];
		while (next->next != NULL)
			next = next->next;
		next->next = new_slot;
	}
	return new_slot;
}


/**
 * slot_remove - Removes a node from the linked list of slots.
 * @old_slot: slot to remove
 *
 * Returns 0 if successful, !0 otherwise.
 */
static int slot_remove(struct pci_func * old_slot)
{
	struct pci_func *next;

	if (old_slot == NULL)
		return 1;

	next = pciehp_slot_list[old_slot->bus];

	if (next == NULL)
		return 1;

	if (next == old_slot) {
		pciehp_slot_list[old_slot->bus] = old_slot->next;
		kfree(old_slot);
		return 0;
	}

	while ((next->next != old_slot) && (next->next != NULL)) {
		next = next->next;
	}

	if (next->next == old_slot) {
		next->next = old_slot->next;
		kfree(old_slot);
		return 0;
	} else
		return 2;
}


/**
 * bridge_slot_remove - Removes a node from the linked list of slots.
 * @bridge: bridge to remove
 *
 * Returns 0 if successful, !0 otherwise.
 */
static int bridge_slot_remove(struct pci_func *bridge)
{
	u8 subordinateBus, secondaryBus;
	u8 tempBus;
	struct pci_func *next;

	if (bridge == NULL)
		return 1;

	secondaryBus = (bridge->config_space[0x06] >> 8) & 0xFF;
	subordinateBus = (bridge->config_space[0x06] >> 16) & 0xFF;

	for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
		next = pciehp_slot_list[tempBus];

		while (!slot_remove(next)) {
			next = pciehp_slot_list[tempBus];
		}
	}

	next = pciehp_slot_list[bridge->bus];

	if (next == NULL) {
		return 1;
	}

	if (next == bridge) {
		pciehp_slot_list[bridge->bus] = bridge->next;
		kfree(bridge);
		return 0;
	}

	while ((next->next != bridge) && (next->next != NULL)) {
		next = next->next;
	}

	if (next->next == bridge) {
		next->next = bridge->next;
		kfree(bridge);
		return 0;
	} else
		return 2;
}


/**
 * pciehp_slot_find - Looks for a node by bus, and device, multiple functions accessed
 * @bus: bus to find
 * @device: device to find
 * @index: is 0 for first function found, 1 for the second...
 *
 * Returns pointer to the node if successful, %NULL otherwise.
 */
struct pci_func *pciehp_slot_find(u8 bus, u8 device, u8 index)
{
	int found = -1;
	struct pci_func *func;

	func = pciehp_slot_list[bus];
	dbg("%s: bus %x device %x index %x\n",
		__FUNCTION__, bus, device, index);
	if (func != NULL) {
		dbg("%s: func-> bus %x device %x function %x pci_dev %p\n",
			__FUNCTION__, func->bus, func->device, func->function,
			func->pci_dev);
	} else
		dbg("%s: func == NULL\n", __FUNCTION__);

	if ((func == NULL) || ((func->device == device) && (index == 0)))
		return func;

	if (func->device == device)
		found++;

	while (func->next != NULL) {
		func = func->next;

		dbg("%s: In while loop, func-> bus %x device %x function %x pci_dev %p\n",
			__FUNCTION__, func->bus, func->device, func->function,
			func->pci_dev);
		if (func->device == device)
			found++;
		dbg("%s: while loop, found %d, index %d\n", __FUNCTION__,
			found, index);

		if ((found == index) || (func->function == index)) {
			dbg("%s: Found bus %x dev %x func %x\n", __FUNCTION__,
					func->bus, func->device, func->function);
			return func;
		}
	}

	return NULL;
}

static int is_bridge(struct pci_func * func)
{
	/* Check the header type */
	if (((func->config_space[0x03] >> 16) & 0xFF) == 0x01)
		return 1;
	else
		return 0;
}


/* The following routines constitute the bulk of the 
   hotplug controller logic
 */

static void set_slot_off(struct controller *ctrl, struct slot * pslot)
{
	/* Wait for exclusive access to hardware */
	down(&ctrl->crit_sect);

	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
	if (POWER_CTRL(ctrl->ctrlcap)) {
		if (pslot->hpc_ops->power_off_slot(pslot)) {   
			err("%s: Issue of Slot Power Off command failed\n", __FUNCTION__);
			up(&ctrl->crit_sect);
			return;
		}
		wait_for_ctrl_irq (ctrl);
	}

	if (PWR_LED(ctrl->ctrlcap)) {
		pslot->hpc_ops->green_led_off(pslot);   
		wait_for_ctrl_irq (ctrl);
	}

	if (ATTN_LED(ctrl->ctrlcap)) { 
		if (pslot->hpc_ops->set_attention_status(pslot, 1)) {   
			err("%s: Issue of Set Attention Led command failed\n", __FUNCTION__);
			up(&ctrl->crit_sect);
			return;
		}
		wait_for_ctrl_irq (ctrl);
	}

	/* Done with exclusive hardware access */
	up(&ctrl->crit_sect);
}

/**
 * board_added - Called after a board has been added to the system.
 *
 * Turns power on for the board
 * Configures board
 *
 */
static u32 board_added(struct pci_func * func, struct controller * ctrl)
{
	u8 hp_slot;
	u32 temp_register = 0xFFFFFFFF;
	u32 rc = 0;
	struct slot *p_slot;

	p_slot = pciehp_find_slot(ctrl, func->device);
	hp_slot = func->device - ctrl->slot_device_offset;

	dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n", __FUNCTION__, func->device, ctrl->slot_device_offset, hp_slot);

	/* Wait for exclusive access to hardware */
	down(&ctrl->crit_sect);

	if (POWER_CTRL(ctrl->ctrlcap)) {
		/* Power on slot */
		rc = p_slot->hpc_ops->power_on_slot(p_slot);
		if (rc) {
			up(&ctrl->crit_sect);
			return -1;
		}

		/* Wait for the command to complete */
		wait_for_ctrl_irq (ctrl);
	}
	
	if (PWR_LED(ctrl->ctrlcap)) {
		p_slot->hpc_ops->green_led_blink(p_slot);
			
		/* Wait for the command to complete */
		wait_for_ctrl_irq (ctrl);
	}

	/* Done with exclusive hardware access */
	up(&ctrl->crit_sect);

	/* Wait for ~1 second */
	dbg("%s: before long_delay\n", __FUNCTION__);
	wait_for_ctrl_irq (ctrl);
	dbg("%s: afterlong_delay\n", __FUNCTION__);

	/*  Check link training status */
	rc = p_slot->hpc_ops->check_lnk_status(ctrl);  
	if (rc) {
		err("%s: Failed to check link status\n", __FUNCTION__);
		set_slot_off(ctrl, p_slot);
		return rc;
	}

	dbg("%s: func status = %x\n", __FUNCTION__, func->status);

	/* Check for a power fault */
	if (func->status == 0xFF) {
		/* power fault occurred, but it was benign */
		temp_register = 0xFFFFFFFF;
		dbg("%s: temp register set to %x by power fault\n", __FUNCTION__, temp_register);
		rc = POWER_FAILURE;
		func->status = 0;
		goto err_exit;
	}

	rc = pciehp_configure_device(p_slot);
	if (rc) {
		err("Cannot add device 0x%x:%x\n", p_slot->bus,
				p_slot->device);
		goto err_exit;
	}

	pciehp_save_slot_config(ctrl, func);
	func->status = 0;
	func->switch_save = 0x10;
	func->is_a_board = 0x01;

	/*
	 * Some PCI Express root ports require fixup after hot-plug operation.
	 */
	if (pcie_mch_quirk)
		pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
	if (PWR_LED(ctrl->ctrlcap)) {
		/* Wait for exclusive access to hardware */
  		down(&ctrl->crit_sect);

  		p_slot->hpc_ops->green_led_on(p_slot);
  
  		/* Wait for the command to complete */
  		wait_for_ctrl_irq (ctrl);
  	
  		/* Done with exclusive hardware access */
  		up(&ctrl->crit_sect);
  	}
	return 0;

err_exit:
	set_slot_off(ctrl, p_slot);
	return -1;
}


/**
 * remove_board - Turns off slot and LED's
 *
 */
static u32 remove_board(struct pci_func *func, struct controller *ctrl)
{
	u8 device;
	u8 hp_slot;
	u32 rc;
	struct slot *p_slot;

	if (func == NULL)
		return 1;

	if (pciehp_unconfigure_device(func))
		return 1;

	device = func->device;

	hp_slot = func->device - ctrl->slot_device_offset;
	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);

	/* Change status to shutdown */
	if (func->is_a_board)
		func->status = 0x01;
	func->configured = 0;

	/* Wait for exclusive access to hardware */
	down(&ctrl->crit_sect);

	if (POWER_CTRL(ctrl->ctrlcap)) {
		/* power off slot */
		rc = p_slot->hpc_ops->power_off_slot(p_slot);
		if (rc) {
			err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
			up(&ctrl->crit_sect);
			return rc;
		}
		/* Wait for the command to complete */
		wait_for_ctrl_irq (ctrl);
	}

	if (PWR_LED(ctrl->ctrlcap)) {
		/* turn off Green LED */
		p_slot->hpc_ops->green_led_off(p_slot);
	
		/* Wait for the command to complete */
		wait_for_ctrl_irq (ctrl);
	}

	/* Done with exclusive hardware access */
	up(&ctrl->crit_sect);

	if (ctrl->add_support) {
		while (func) {
			if (is_bridge(func)) {
				dbg("PCI Bridge Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n", 
					ctrl->seg, func->bus, func->device, func->function);
				bridge_slot_remove(func);
			} else {
				dbg("PCI Function Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n", 
					ctrl->seg, func->bus, func->device, func->function);
				slot_remove(func);
			}

			func = pciehp_slot_find(ctrl->slot_bus, device, 0);
		}

		/* Setup slot structure with entry for empty slot */
		func = pciehp_slot_create(ctrl->slot_bus);

		if (func == NULL) {
			return 1;
		}

		func->bus = ctrl->slot_bus;
		func->device = device;
		func->function = 0;
		func->configured = 0;
		func->switch_save = 0x10;
		func->is_a_board = 0;
	}

	return 0;
}


static void pushbutton_helper_thread(unsigned long data)
{
	pushbutton_pending = data;

	up(&event_semaphore);
}

/**
 * pciehp_pushbutton_thread
 *
 * Scheduled procedure to handle blocking stuff for the pushbuttons
 * Handles all pending events and exits.
 *
 */
static void pciehp_pushbutton_thread(unsigned long slot)
{
	struct slot *p_slot = (struct slot *) slot;
	u8 getstatus;
	
	pushbutton_pending = 0;

	if (!p_slot) {
		dbg("%s: Error! slot NULL\n", __FUNCTION__);
		return;
	}

	p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (getstatus) {
		p_slot->state = POWEROFF_STATE;
		dbg("In power_down_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);

		pciehp_disable_slot(p_slot);
		p_slot->state = STATIC_STATE;
	} else {
		p_slot->state = POWERON_STATE;
		dbg("In add_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);

		if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
			/* Wait for exclusive access to hardware */
			down(&p_slot->ctrl->crit_sect);

			p_slot->hpc_ops->green_led_off(p_slot);

			/* Wait for the command to complete */
			wait_for_ctrl_irq (p_slot->ctrl);

			/* Done with exclusive hardware access */
			up(&p_slot->ctrl->crit_sect);
		}
		p_slot->state = STATIC_STATE;
	}

	return;
}

/**
 * pciehp_surprise_rm_thread
 *
 * Scheduled procedure to handle blocking stuff for the surprise removal
 * Handles all pending events and exits.
 *
 */
static void pciehp_surprise_rm_thread(unsigned long slot)
{
	struct slot *p_slot = (struct slot *) slot;
	u8 getstatus;
	
	surprise_rm_pending = 0;

	if (!p_slot) {
		dbg("%s: Error! slot NULL\n", __FUNCTION__);
		return;
	}

	p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (!getstatus) {
		p_slot->state = POWEROFF_STATE;
		dbg("In removing board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);

		pciehp_disable_slot(p_slot);
		p_slot->state = STATIC_STATE;
	} else {
		p_slot->state = POWERON_STATE;
		dbg("In add_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);

		if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
			/* Wait for exclusive access to hardware */
			down(&p_slot->ctrl->crit_sect);

			p_slot->hpc_ops->green_led_off(p_slot);

			/* Wait for the command to complete */
			wait_for_ctrl_irq (p_slot->ctrl);

			/* Done with exclusive hardware access */
			up(&p_slot->ctrl->crit_sect);
		}
		p_slot->state = STATIC_STATE;
	}

	return;
}



/* this is the main worker thread */
static int event_thread(void* data)
{
	struct controller *ctrl;
	lock_kernel();
	daemonize("pciehpd_event");

	unlock_kernel();

	while (1) {
		dbg("!!!!event_thread sleeping\n");
		down_interruptible (&event_semaphore);
		dbg("event_thread woken finished = %d\n", event_finished);
		if (event_finished || signal_pending(current))
			break;
		/* Do stuff here */
		if (pushbutton_pending)
			pciehp_pushbutton_thread(pushbutton_pending);
		else if (surprise_rm_pending)
			pciehp_surprise_rm_thread(surprise_rm_pending);
		else
			for (ctrl = pciehp_ctrl_list; ctrl; ctrl=ctrl->next)
				interrupt_event_handler(ctrl);
	}
	dbg("event_thread signals exit\n");
	up(&event_exit);
	return 0;
}

int pciehp_event_start_thread(void)
{
	int pid;

	/* initialize our semaphores */
	init_MUTEX_LOCKED(&event_exit);
	event_finished=0;

	init_MUTEX_LOCKED(&event_semaphore);
	pid = kernel_thread(event_thread, NULL, 0);

	if (pid < 0) {
		err ("Can't start up our event thread\n");
		return -1;
	}
	dbg("Our event thread pid = %d\n", pid);
	return 0;
}


void pciehp_event_stop_thread(void)
{
	event_finished = 1;
	dbg("event_thread finish command given\n");
	up(&event_semaphore);
	dbg("wait for event_thread to exit\n");
	down(&event_exit);
}


static int update_slot_info(struct slot *slot)
{
	struct hotplug_slot_info *info;
	/* char buffer[SLOT_NAME_SIZE]; */
	int result;

	info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	/* make_slot_name (&buffer[0], SLOT_NAME_SIZE, slot); */

	slot->hpc_ops->get_power_status(slot, &(info->power_status));
	slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
	slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
	slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));

	/* result = pci_hp_change_slot_info(buffer, info); */
	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
	kfree (info);
	return result;
}

static void interrupt_event_handler(struct controller *ctrl)
{
	int loop = 0;
	int change = 1;
	struct pci_func *func;
	u8 hp_slot;
	u8 getstatus;
	struct slot *p_slot;

	while (change) {
		change = 0;

		for (loop = 0; loop < 10; loop++) {
			if (ctrl->event_queue[loop].event_type != 0) {
				hp_slot = ctrl->event_queue[loop].hp_slot;

				func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);

				p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

				dbg("hp_slot %d, func %p, p_slot %p\n", hp_slot, func, p_slot);

				if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
					dbg("button cancel\n");
					del_timer(&p_slot->task_event);

					switch (p_slot->state) {
					case BLINKINGOFF_STATE:
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);
						
						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_on(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 0);

							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);
						break;
					case BLINKINGON_STATE:
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_off(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						if (ATTN_LED(ctrl->ctrlcap)){
							p_slot->hpc_ops->set_attention_status(p_slot, 0);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);

						break;
					default:
						warn("Not a valid state\n");
						return;
					}
					info(msg_button_cancel, p_slot->number);
					p_slot->state = STATIC_STATE;
				}
				/* ***********Button Pressed (No action on 1st press...) */
				else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
					
					if (ATTN_BUTTN(ctrl->ctrlcap)) {
						dbg("Button pressed\n");
						p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
						if (getstatus) {
							/* slot is on */
							dbg("slot is on\n");
							p_slot->state = BLINKINGOFF_STATE;
							info(msg_button_off, p_slot->number);
						} else {
							/* slot is off */
							dbg("slot is off\n");
							p_slot->state = BLINKINGON_STATE;
							info(msg_button_on, p_slot->number);
						}

						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						/* blink green LED and turn off amber */
						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_blink(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}

						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 0);

							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}

						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);

						init_timer(&p_slot->task_event);
						p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
						p_slot->task_event.function = (void (*)(unsigned long)) pushbutton_helper_thread;
						p_slot->task_event.data = (unsigned long) p_slot;

						dbg("add_timer p_slot = %p\n", (void *) p_slot);
						add_timer(&p_slot->task_event);
					}
				}
				/***********POWER FAULT********************/
				else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
					if (POWER_CTRL(ctrl->ctrlcap)) {
						dbg("power fault\n");
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 1);
							wait_for_ctrl_irq (ctrl);
						}

						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_off(p_slot);
							wait_for_ctrl_irq (ctrl);
						}

						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);
					}
				}
				/***********SURPRISE REMOVAL********************/
				else if ((ctrl->event_queue[loop].event_type == INT_PRESENCE_ON) || 
					(ctrl->event_queue[loop].event_type == INT_PRESENCE_OFF)) {
					if (HP_SUPR_RM(ctrl->ctrlcap)) {
						dbg("Surprise Removal\n");
						if (p_slot) {
							surprise_rm_pending = (unsigned long) p_slot;
							up(&event_semaphore);
							update_slot_info(p_slot);
						}
					}
				} else {
					/* refresh notification */
					if (p_slot)
						update_slot_info(p_slot);
				}

				ctrl->event_queue[loop].event_type = 0;

				change = 1;
			}
		}		/* End of FOR loop */
	}
}


int pciehp_enable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc;
	struct pci_func *func;

	func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
	if (!func) {
		dbg("%s: Error! slot NULL\n", __FUNCTION__);
		return 1;
	}

	/* Check to see if (latch closed, card present, power off) */
	down(&p_slot->ctrl->crit_sect);

	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (rc || !getstatus) {
		info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
		up(&p_slot->ctrl->crit_sect);
		return 1;
	}
	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {	
		rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		if (rc || getstatus) {
			info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}
	
	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {	
		rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (rc || getstatus) {
			info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}
	up(&p_slot->ctrl->crit_sect);

	slot_remove(func);

	func = pciehp_slot_create(p_slot->bus);
	if (func == NULL)
		return 1;

	func->bus = p_slot->bus;
	func->device = p_slot->device;
	func->function = 0;
	func->configured = 0;
	func->is_a_board = 1;

	/* We have to save the presence info for these slots */
	p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	func->switch_save = !getstatus? 0x10:0;

	rc = board_added(func, p_slot->ctrl);
	if (rc) {
		if (is_bridge(func))
			bridge_slot_remove(func);
		else
			slot_remove(func);

		/* Setup slot structure with entry for empty slot */
		func = pciehp_slot_create(p_slot->bus);
		if (func == NULL)
			return 1;	/* Out of memory */

		func->bus = p_slot->bus;
		func->device = p_slot->device;
		func->function = 0;
		func->configured = 0;
		func->is_a_board = 1;

		/* We have to save the presence info for these slots */
		p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
		p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		func->switch_save = !getstatus? 0x10:0;
	}

	if (p_slot)
		update_slot_info(p_slot);

	return rc;
}


int pciehp_disable_slot(struct slot *p_slot)
{
	u8 class_code, header_type, BCR;
	u8 index = 0;
	u8 getstatus = 0;
	u32 rc = 0;
	int ret = 0;
	unsigned int devfn;
	struct pci_bus *pci_bus = p_slot->ctrl->pci_dev->subordinate;
	struct pci_func *func;

	if (!p_slot->ctrl)
		return 1;

	/* Check to see if (latch closed, card present, power on) */
	down(&p_slot->ctrl->crit_sect);

	if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {	
		ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {	
		ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		if (ret || getstatus) {
			info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {	
		ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			info("%s: already disabled slot(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	up(&p_slot->ctrl->crit_sect);

	func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);

	/* Make sure there are no video controllers here
	 * for all func of p_slot
	 */
	while (func && !rc) {
		pci_bus->number = func->bus;
		devfn = PCI_DEVFN(func->device, func->function);

		/* Check the Class Code */
		rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);
		if (rc)
			return rc;

		if (class_code == PCI_BASE_CLASS_DISPLAY) {
			/* Display/Video adapter (not supported) */
			rc = REMOVE_NOT_SUPPORTED;
		} else {
			/* See if it's a bridge */
			rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
			if (rc)
				return rc;

			/* If it's a bridge, check the VGA Enable bit */
			if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
				rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
				if (rc)
					return rc;

				/* If the VGA Enable bit is set, remove isn't supported */
				if (BCR & PCI_BRIDGE_CTL_VGA) {
					rc = REMOVE_NOT_SUPPORTED;
				}
			}
		}

		func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);
	}

	func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
	if ((func != NULL) && !rc) {
		rc = remove_board(func, p_slot->ctrl);
	} else if (!rc)
		rc = 1;

	if (p_slot)
		update_slot_info(p_slot);

	return rc;
}