/*
 * Compaq 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.
 *
 * 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>
 *
 */

#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/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/kthread.h>
#include "cpqphp.h"

static u32 configure_new_device(struct controller* ctrl, struct pci_func *func,
                        u8 behind_bridge, struct resource_lists *resources);
static int configure_new_function(struct controller* ctrl, struct pci_func *func,
                        u8 behind_bridge, struct resource_lists *resources);
static void interrupt_event_handler(struct controller *ctrl);


static struct task_struct *cpqhp_event_thread;
static unsigned long pushbutton_pending;        /* = 0 */

/* delay is in jiffies to wait for */
static void long_delay(int delay)
{
        /*
         * XXX(hch): if someone is bored please convert all callers
         * to call msleep_interruptible directly.  They really want
         * to specify timeouts in natural units and spend a lot of
         * effort converting them to jiffies..
         */
        msleep_interruptible(jiffies_to_msecs(delay));
}


/* FIXME: The following line needs to be somewhere else... */
#define WRONG_BUS_FREQUENCY 0x07
static u8 handle_switch_change(u8 change, struct controller * ctrl)
{
        int hp_slot;
        u8 rc = 0;
        u16 temp_word;
        struct pci_func *func;
        struct event_info *taskInfo;

        if (!change)
                return 0;

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

        for (hp_slot = 0; hp_slot < 6; hp_slot++) {
                if (change & (0x1L << hp_slot)) {
                        /*
                         * this one changed.
                         */
                        func = cpqhp_slot_find(ctrl->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++;

                        temp_word = ctrl->ctrl_int_comp >> 16;
                        func->presence_save = (temp_word >> hp_slot) & 0x01;
                        func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;

                        if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
                                /*
                                 * Switch opened
                                 */

                                func->switch_save = 0;

                                taskInfo->event_type = INT_SWITCH_OPEN;
                        } else {
                                /*
                                 * Switch closed
                                 */

                                func->switch_save = 0x10;

                                taskInfo->event_type = INT_SWITCH_CLOSE;
                        }
                }
        }

        return rc;
}

/**
 * cpqhp_find_slot - find the struct slot of given device
 * @ctrl: scan lots of this controller
 * @device: the device id to find
 */
static struct slot *cpqhp_find_slot(struct controller *ctrl, u8 device)
{
        struct slot *slot = ctrl->slot;

        while (slot && (slot->device != device))
                slot = slot->next;

        return slot;
}


static u8 handle_presence_change(u16 change, struct controller * ctrl)
{
        int hp_slot;
        u8 rc = 0;
        u8 temp_byte;
        u16 temp_word;
        struct pci_func *func;
        struct event_info *taskInfo;
        struct slot *p_slot;

        if (!change)
                return 0;

        /*
         * Presence Change
         */
        dbg("cpqsbd:  Presence/Notify input change.\n");
        dbg("         Changed bits are 0x%4.4x\n", change );

        for (hp_slot = 0; hp_slot < 6; hp_slot++) {
                if (change & (0x0101 << hp_slot)) {
                        /*
                         * this one changed.
                         */
                        func = cpqhp_slot_find(ctrl->bus,
                                (hp_slot + ctrl->slot_device_offset), 0);

                        taskInfo = &(ctrl->event_queue[ctrl->next_event]);
                        ctrl->next_event = (ctrl->next_event + 1) % 10;
                        taskInfo->hp_slot = hp_slot;

                        rc++;

                        p_slot = cpqhp_find_slot(ctrl, hp_slot + (readb(ctrl->hpc_reg + SLOT_MASK) >> 4));
                        if (!p_slot)
                                return 0;

                        /* If the switch closed, must be a button
                         * If not in button mode, nevermind
                         */
                        if (func->switch_save && (ctrl->push_button == 1)) {
                                temp_word = ctrl->ctrl_int_comp >> 16;
                                temp_byte = (temp_word >> hp_slot) & 0x01;
                                temp_byte |= (temp_word >> (hp_slot + 7)) & 0x02;

                                if (temp_byte != func->presence_save) {
                                        /*
                                         * button Pressed (doesn't do anything)
                                         */
                                        dbg("hp_slot %d button pressed\n", hp_slot);
                                        taskInfo->event_type = INT_BUTTON_PRESS;
                                } else {
                                        /*
                                         * button Released - TAKE ACTION!!!!
                                         */
                                        dbg("hp_slot %d button released\n", hp_slot);
                                        taskInfo->event_type = INT_BUTTON_RELEASE;

                                        /* Cancel if we are still blinking */
                                        if ((p_slot->state == BLINKINGON_STATE)
                                            || (p_slot->state == BLINKINGOFF_STATE)) {
                                                taskInfo->event_type = INT_BUTTON_CANCEL;
                                                dbg("hp_slot %d button cancel\n", hp_slot);
                                        } else if ((p_slot->state == POWERON_STATE)
                                                   || (p_slot->state == POWEROFF_STATE)) {
                                                /* info(msg_button_ignore, p_slot->number); */
                                                taskInfo->event_type = INT_BUTTON_IGNORE;
                                                dbg("hp_slot %d button ignore\n", hp_slot);
                                        }
                                }
                        } else {
                                /* Switch is open, assume a presence change
                                 * Save the presence state
                                 */
                                temp_word = ctrl->ctrl_int_comp >> 16;
                                func->presence_save = (temp_word >> hp_slot) & 0x01;
                                func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;

                                if ((!(ctrl->ctrl_int_comp & (0x010000 << hp_slot))) ||
                                    (!(ctrl->ctrl_int_comp & (0x01000000 << hp_slot)))) {
                                        /* Present */
                                        taskInfo->event_type = INT_PRESENCE_ON;
                                } else {
                                        /* Not Present */
                                        taskInfo->event_type = INT_PRESENCE_OFF;
                                }
                        }
                }
        }

        return rc;
}


static u8 handle_power_fault(u8 change, struct controller * ctrl)
{
        int hp_slot;
        u8 rc = 0;
        struct pci_func *func;
        struct event_info *taskInfo;

        if (!change)
                return 0;

        /*
         * power fault
         */

        info("power fault interrupt\n");

        for (hp_slot = 0; hp_slot < 6; hp_slot++) {
                if (change & (0x01 << hp_slot)) {
                        /*
                         * this one changed.
                         */
                        func = cpqhp_slot_find(ctrl->bus,
                                (hp_slot + ctrl->slot_device_offset), 0);

                        taskInfo = &(ctrl->event_queue[ctrl->next_event]);
                        ctrl->next_event = (ctrl->next_event + 1) % 10;
                        taskInfo->hp_slot = hp_slot;

                        rc++;

                        if (ctrl->ctrl_int_comp & (0x00000100 << hp_slot)) {
                                /*
                                 * power fault Cleared
                                 */
                                func->status = 0x00;

                                taskInfo->event_type = INT_POWER_FAULT_CLEAR;
                        } else {
                                /*
                                 * power fault
                                 */
                                taskInfo->event_type = INT_POWER_FAULT;

                                if (ctrl->rev < 4) {
                                        amber_LED_on (ctrl, hp_slot);
                                        green_LED_off (ctrl, hp_slot);
                                        set_SOGO (ctrl);

                                        /* this is a fatal condition, we want
                                         * to crash the machine to protect from
                                         * data corruption. simulated_NMI
                                         * shouldn't ever return */
                                        /* FIXME
                                        simulated_NMI(hp_slot, ctrl); */

                                        /* The following code causes a software
                                         * crash just in case simulated_NMI did
                                         * return */
                                        /*FIXME
                                        panic(msg_power_fault); */
                                } else {
                                        /* set power fault status for this board */
                                        func->status = 0xFF;
                                        info("power fault bit %x set\n", hp_slot);
                                }
                        }
                }
        }

        return rc;
}


/**
 * sort_by_size - sort nodes on the list by their length, smallest first.
 * @head: list to sort
 */
static int sort_by_size(struct pci_resource **head)
{
        struct pci_resource *current_res;
        struct pci_resource *next_res;
        int out_of_order = 1;

        if (!(*head))
                return 1;

        if (!((*head)->next))
                return 0;

        while (out_of_order) {
                out_of_order = 0;

                /* Special case for swapping list head */
                if (((*head)->next) &&
                    ((*head)->length > (*head)->next->length)) {
                        out_of_order++;
                        current_res = *head;
                        *head = (*head)->next;
                        current_res->next = (*head)->next;
                        (*head)->next = current_res;
                }

                current_res = *head;

                while (current_res->next && current_res->next->next) {
                        if (current_res->next->length > current_res->next->next->length) {
                                out_of_order++;
                                next_res = current_res->next;
                                current_res->next = current_res->next->next;
                                current_res = current_res->next;
                                next_res->next = current_res->next;
                                current_res->next = next_res;
                        } else
                                current_res = current_res->next;
                }
        }  /* End of out_of_order loop */

        return 0;
}


/**
 * sort_by_max_size - sort nodes on the list by their length, largest first.
 * @head: list to sort
 */
static int sort_by_max_size(struct pci_resource **head)
{
        struct pci_resource *current_res;
        struct pci_resource *next_res;
        int out_of_order = 1;

        if (!(*head))
                return 1;

        if (!((*head)->next))
                return 0;

        while (out_of_order) {
                out_of_order = 0;

                /* Special case for swapping list head */
                if (((*head)->next) &&
                    ((*head)->length < (*head)->next->length)) {
                        out_of_order++;
                        current_res = *head;
                        *head = (*head)->next;
                        current_res->next = (*head)->next;
                        (*head)->next = current_res;
                }

                current_res = *head;

                while (current_res->next && current_res->next->next) {
                        if (current_res->next->length < current_res->next->next->length) {
                                out_of_order++;
                                next_res = current_res->next;
                                current_res->next = current_res->next->next;
                                current_res = current_res->next;
                                next_res->next = current_res->next;
                                current_res->next = next_res;
                        } else
                                current_res = current_res->next;
                }
        }  /* End of out_of_order loop */

        return 0;
}


/**
 * do_pre_bridge_resource_split - find node of resources that are unused
 * @head: new list head
 * @orig_head: original list head
 * @alignment: max node size (?)
 */
static struct pci_resource *do_pre_bridge_resource_split(struct pci_resource **head,
                                struct pci_resource **orig_head, u32 alignment)
{
        struct pci_resource *prevnode = NULL;
        struct pci_resource *node;
        struct pci_resource *split_node;
        u32 rc;
        u32 temp_dword;
        dbg("do_pre_bridge_resource_split\n");

        if (!(*head) || !(*orig_head))
                return NULL;

        rc = cpqhp_resource_sort_and_combine(head);

        if (rc)
                return NULL;

        if ((*head)->base != (*orig_head)->base)
                return NULL;

        if ((*head)->length == (*orig_head)->length)
                return NULL;


        /* If we got here, there the bridge requires some of the resource, but
         * we may be able to split some off of the front
         */

        node = *head;

        if (node->length & (alignment -1)) {
                /* this one isn't an aligned length, so we'll make a new entry
                 * and split it up.
                 */
                split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                if (!split_node)
                        return NULL;

                temp_dword = (node->length | (alignment-1)) + 1 - alignment;

                split_node->base = node->base;
                split_node->length = temp_dword;

                node->length -= temp_dword;
                node->base += split_node->length;

                /* Put it in the list */
                *head = split_node;
                split_node->next = node;
        }

        if (node->length < alignment)
                return NULL;

        /* Now unlink it */
        if (*head == node) {
                *head = node->next;
        } else {
                prevnode = *head;
                while (prevnode->next != node)
                        prevnode = prevnode->next;

                prevnode->next = node->next;
        }
        node->next = NULL;

        return node;
}


/**
 * do_bridge_resource_split - find one node of resources that aren't in use
 * @head: list head
 * @alignment: max node size (?)
 */
static struct pci_resource *do_bridge_resource_split(struct pci_resource **head, u32 alignment)
{
        struct pci_resource *prevnode = NULL;
        struct pci_resource *node;
        u32 rc;
        u32 temp_dword;

        rc = cpqhp_resource_sort_and_combine(head);

        if (rc)
                return NULL;

        node = *head;

        while (node->next) {
                prevnode = node;
                node = node->next;
                kfree(prevnode);
        }

        if (node->length < alignment)
                goto error;

        if (node->base & (alignment - 1)) {
                /* Short circuit if adjusted size is too small */
                temp_dword = (node->base | (alignment-1)) + 1;
                if ((node->length - (temp_dword - node->base)) < alignment)
                        goto error;

                node->length -= (temp_dword - node->base);
                node->base = temp_dword;
        }

        if (node->length & (alignment - 1))
                /* There's stuff in use after this node */
                goto error;

        return node;
error:
        kfree(node);
        return NULL;
}


/**
 * get_io_resource - find first node of given size not in ISA aliasing window.
 * @head: list to search
 * @size: size of node to find, must be a power of two.
 *
 * Description: This function sorts the resource list by size and then returns
 * returns the first node of "size" length that is not in the ISA aliasing
 * window.  If it finds a node larger than "size" it will split it up.
 */
static struct pci_resource *get_io_resource(struct pci_resource **head, u32 size)
{
        struct pci_resource *prevnode;
        struct pci_resource *node;
        struct pci_resource *split_node;
        u32 temp_dword;

        if (!(*head))
                return NULL;

        if (cpqhp_resource_sort_and_combine(head))
                return NULL;

        if (sort_by_size(head))
                return NULL;

        for (node = *head; node; node = node->next) {
                if (node->length < size)
                        continue;

                if (node->base & (size - 1)) {
                        /* this one isn't base aligned properly
                         * so we'll make a new entry and split it up
                         */
                        temp_dword = (node->base | (size-1)) + 1;

                        /* Short circuit if adjusted size is too small */
                        if ((node->length - (temp_dword - node->base)) < size)
                                continue;

                        split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                        if (!split_node)
                                return NULL;

                        split_node->base = node->base;
                        split_node->length = temp_dword - node->base;
                        node->base = temp_dword;
                        node->length -= split_node->length;

                        /* Put it in the list */
                        split_node->next = node->next;
                        node->next = split_node;
                } /* End of non-aligned base */

                /* Don't need to check if too small since we already did */
                if (node->length > size) {
                        /* this one is longer than we need
                         * so we'll make a new entry and split it up
                         */
                        split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                        if (!split_node)
                                return NULL;

                        split_node->base = node->base + size;
                        split_node->length = node->length - size;
                        node->length = size;

                        /* Put it in the list */
                        split_node->next = node->next;
                        node->next = split_node;
                }  /* End of too big on top end */

                /* For IO make sure it's not in the ISA aliasing space */
                if (node->base & 0x300L)
                        continue;

                /* If we got here, then it is the right size
                 * Now take it out of the list and break
                 */
                if (*head == node) {
                        *head = node->next;
                } else {
                        prevnode = *head;
                        while (prevnode->next != node)
                                prevnode = prevnode->next;

                        prevnode->next = node->next;
                }
                node->next = NULL;
                break;
        }

        return node;
}


/**
 * get_max_resource - get largest node which has at least the given size.
 * @head: the list to search the node in
 * @size: the minimum size of the node to find
 *
 * Description: Gets the largest node that is at least "size" big from the
 * list pointed to by head.  It aligns the node on top and bottom
 * to "size" alignment before returning it.
 */
static struct pci_resource *get_max_resource(struct pci_resource **head, u32 size)
{
        struct pci_resource *max;
        struct pci_resource *temp;
        struct pci_resource *split_node;
        u32 temp_dword;

        if (cpqhp_resource_sort_and_combine(head))
                return NULL;

        if (sort_by_max_size(head))
                return NULL;

        for (max = *head; max; max = max->next) {
                /* If not big enough we could probably just bail,
                 * instead we'll continue to the next.
                 */
                if (max->length < size)
                        continue;

                if (max->base & (size - 1)) {
                        /* this one isn't base aligned properly
                         * so we'll make a new entry and split it up
                         */
                        temp_dword = (max->base | (size-1)) + 1;

                        /* Short circuit if adjusted size is too small */
                        if ((max->length - (temp_dword - max->base)) < size)
                                continue;

                        split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                        if (!split_node)
                                return NULL;

                        split_node->base = max->base;
                        split_node->length = temp_dword - max->base;
                        max->base = temp_dword;
                        max->length -= split_node->length;

                        split_node->next = max->next;
                        max->next = split_node;
                }

                if ((max->base + max->length) & (size - 1)) {
                        /* this one isn't end aligned properly at the top
                         * so we'll make a new entry and split it up
                         */
                        split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                        if (!split_node)
                                return NULL;
                        temp_dword = ((max->base + max->length) & ~(size - 1));
                        split_node->base = temp_dword;
                        split_node->length = max->length + max->base
                                             - split_node->base;
                        max->length -= split_node->length;

                        split_node->next = max->next;
                        max->next = split_node;
                }

                /* Make sure it didn't shrink too much when we aligned it */
                if (max->length < size)
                        continue;

                /* Now take it out of the list */
                temp = *head;
                if (temp == max) {
                        *head = max->next;
                } else {
                        while (temp && temp->next != max) {
                                temp = temp->next;
                        }

                        temp->next = max->next;
                }

                max->next = NULL;
                break;
        }

        return max;
}


/**
 * get_resource - find resource of given size and split up larger ones.
 * @head: the list to search for resources
 * @size: the size limit to use
 *
 * Description: This function sorts the resource list by size and then
 * returns the first node of "size" length.  If it finds a node
 * larger than "size" it will split it up.
 *
 * size must be a power of two.
 */
static struct pci_resource *get_resource(struct pci_resource **head, u32 size)
{
        struct pci_resource *prevnode;
        struct pci_resource *node;
        struct pci_resource *split_node;
        u32 temp_dword;

        if (cpqhp_resource_sort_and_combine(head))
                return NULL;

        if (sort_by_size(head))
                return NULL;

        for (node = *head; node; node = node->next) {
                dbg("%s: req_size =%x node=%p, base=%x, length=%x\n",
                    __func__, size, node, node->base, node->length);
                if (node->length < size)
                        continue;

                if (node->base & (size - 1)) {
                        dbg("%s: not aligned\n", __func__);
                        /* this one isn't base aligned properly
                         * so we'll make a new entry and split it up
                         */
                        temp_dword = (node->base | (size-1)) + 1;

                        /* Short circuit if adjusted size is too small */
                        if ((node->length - (temp_dword - node->base)) < size)
                                continue;

                        split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                        if (!split_node)
                                return NULL;

                        split_node->base = node->base;
                        split_node->length = temp_dword - node->base;
                        node->base = temp_dword;
                        node->length -= split_node->length;

                        split_node->next = node->next;
                        node->next = split_node;
                } /* End of non-aligned base */

                /* Don't need to check if too small since we already did */
                if (node->length > size) {
                        dbg("%s: too big\n", __func__);
                        /* this one is longer than we need
                         * so we'll make a new entry and split it up
                         */
                        split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);

                        if (!split_node)
                                return NULL;

                        split_node->base = node->base + size;
                        split_node->length = node->length - size;
                        node->length = size;

                        /* Put it in the list */
                        split_node->next = node->next;
                        node->next = split_node;
                }  /* End of too big on top end */

                dbg("%s: got one!!!\n", __func__);
                /* If we got here, then it is the right size
                 * Now take it out of the list */
                if (*head == node) {
                        *head = node->next;
                } else {
                        prevnode = *head;
                        while (prevnode->next != node)
                                prevnode = prevnode->next;

                        prevnode->next = node->next;
                }
                node->next = NULL;
                break;
        }
        return node;
}


/**
 * cpqhp_resource_sort_and_combine - sort nodes by base addresses and clean up
 * @head: the list to sort and clean up
 *
 * Description: Sorts all of the nodes in the list in ascending order by
 * their base addresses.  Also does garbage collection by
 * combining adjacent nodes.
 *
 * Returns %0 if success.
 */
int cpqhp_resource_sort_and_combine(struct pci_resource **head)
{
        struct pci_resource *node1;
        struct pci_resource *node2;
        int out_of_order = 1;

        dbg("%s: head = %p, *head = %p\n", __func__, head, *head);

        if (!(*head))
                return 1;

        dbg("*head->next = %p\n",(*head)->next);

        if (!(*head)->next)
                return 0;       /* only one item on the list, already sorted! */

        dbg("*head->base = 0x%x\n",(*head)->base);
        dbg("*head->next->base = 0x%x\n",(*head)->next->base);
        while (out_of_order) {
                out_of_order = 0;

                /* Special case for swapping list head */
                if (((*head)->next) &&
                    ((*head)->base > (*head)->next->base)) {
                        node1 = *head;
                        (*head) = (*head)->next;
                        node1->next = (*head)->next;
                        (*head)->next = node1;
                        out_of_order++;
                }

                node1 = (*head);

                while (node1->next && node1->next->next) {
                        if (node1->next->base > node1->next->next->base) {
                                out_of_order++;
                                node2 = node1->next;
                                node1->next = node1->next->next;
                                node1 = node1->next;
                                node2->next = node1->next;
                                node1->next = node2;
                        } else
                                node1 = node1->next;
                }
        }  /* End of out_of_order loop */

        node1 = *head;

        while (node1 && node1->next) {
                if ((node1->base + node1->length) == node1->next->base) {
                        /* Combine */
                        dbg("8..\n");
                        node1->length += node1->next->length;
                        node2 = node1->next;
                        node1->next = node1->next->next;
                        kfree(node2);
                } else
                        node1 = node1->next;
        }

        return 0;
}


irqreturn_t cpqhp_ctrl_intr(int IRQ, void *data)
{
        struct controller *ctrl = data;
        u8 schedule_flag = 0;
        u8 reset;
        u16 misc;
        u32 Diff;
        u32 temp_dword;


        misc = readw(ctrl->hpc_reg + MISC);
        /*
         * Check to see if it was our interrupt
         */
        if (!(misc & 0x000C)) {
                return IRQ_NONE;
        }

        if (misc & 0x0004) {
                /*
                 * Serial Output interrupt Pending
                 */

                /* Clear the interrupt */
                misc |= 0x0004;
                writew(misc, ctrl->hpc_reg + MISC);

                /* Read to clear posted writes */
                misc = readw(ctrl->hpc_reg + MISC);

                dbg ("%s - waking up\n", __func__);
                wake_up_interruptible(&ctrl->queue);
        }

        if (misc & 0x0008) {
                /* General-interrupt-input interrupt Pending */
                Diff = readl(ctrl->hpc_reg + INT_INPUT_CLEAR) ^ ctrl->ctrl_int_comp;

                ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);

                /* Clear the interrupt */
                writel(Diff, ctrl->hpc_reg + INT_INPUT_CLEAR);

                /* Read it back to clear any posted writes */
                temp_dword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);

                if (!Diff)
                        /* Clear all interrupts */
                        writel(0xFFFFFFFF, ctrl->hpc_reg + INT_INPUT_CLEAR);

                schedule_flag += handle_switch_change((u8)(Diff & 0xFFL), ctrl);
                schedule_flag += handle_presence_change((u16)((Diff & 0xFFFF0000L) >> 16), ctrl);
                schedule_flag += handle_power_fault((u8)((Diff & 0xFF00L) >> 8), ctrl);
        }

        reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
        if (reset & 0x40) {
                /* Bus reset has completed */
                reset &= 0xCF;
                writeb(reset, ctrl->hpc_reg + RESET_FREQ_MODE);
                reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
                wake_up_interruptible(&ctrl->queue);
        }

        if (schedule_flag) {
                wake_up_process(cpqhp_event_thread);
                dbg("Waking even thread");
        }
        return IRQ_HANDLED;
}


/**
 * cpqhp_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 *cpqhp_slot_create(u8 busnumber)
{
        struct pci_func *new_slot;
        struct pci_func *next;

        new_slot = kzalloc(sizeof(*new_slot), GFP_KERNEL);
        if (new_slot == NULL)
                return new_slot;

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

        if (cpqhp_slot_list[busnumber] == NULL) {
                cpqhp_slot_list[busnumber] = new_slot;
        } else {
                next = cpqhp_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 = cpqhp_slot_list[old_slot->bus];
        if (next == NULL)
                return 1;

        if (next == old_slot) {
                cpqhp_slot_list[old_slot->bus] = old_slot->next;
                cpqhp_destroy_board_resources(old_slot);
                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;
                cpqhp_destroy_board_resources(old_slot);
                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;

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

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

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

        next = cpqhp_slot_list[bridge->bus];

        if (next == NULL)
                return 1;

        if (next == bridge) {
                cpqhp_slot_list[bridge->bus] = bridge->next;
                goto out;
        }

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

        if (next->next != bridge)
                return 2;
        next->next = bridge->next;
out:
        kfree(bridge);
        return 0;
}


/**
 * cpqhp_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 *cpqhp_slot_find(u8 bus, u8 device, u8 index)
{
        int found = -1;
        struct pci_func *func;

        func = cpqhp_slot_list[bus];

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

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

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

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

                if (found == index)
                        return func;
        }

        return NULL;
}


/* DJZ: I don't think is_bridge will work as is.
 * FIXME */
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;
}


/**
 * set_controller_speed - set the frequency and/or mode of a specific controller segment.
 * @ctrl: controller to change frequency/mode for.
 * @adapter_speed: the speed of the adapter we want to match.
 * @hp_slot: the slot number where the adapter is installed.
 *
 * Returns %0 if we successfully change frequency and/or mode to match the
 * adapter speed.
 */
static u8 set_controller_speed(struct controller *ctrl, u8 adapter_speed, u8 hp_slot)
{
        struct slot *slot;
        struct pci_bus *bus = ctrl->pci_bus;
        u8 reg;
        u8 slot_power = readb(ctrl->hpc_reg + SLOT_POWER);
        u16 reg16;
        u32 leds = readl(ctrl->hpc_reg + LED_CONTROL);

        if (bus->cur_bus_speed == adapter_speed)
                return 0;

        /* We don't allow freq/mode changes if we find another adapter running
         * in another slot on this controller
         */
        for(slot = ctrl->slot; slot; slot = slot->next) {
                if (slot->device == (hp_slot + ctrl->slot_device_offset))
                        continue;
                if (!slot->hotplug_slot || !slot->hotplug_slot->info)
                        continue;
                if (slot->hotplug_slot->info->adapter_status == 0)
                        continue;
                /* If another adapter is running on the same segment but at a
                 * lower speed/mode, we allow the new adapter to function at
                 * this rate if supported
                 */
                if (bus->cur_bus_speed < adapter_speed)
                        return 0;

                return 1;
        }

        /* If the controller doesn't support freq/mode changes and the
         * controller is running at a higher mode, we bail
         */
        if ((bus->cur_bus_speed > adapter_speed) && (!ctrl->pcix_speed_capability))
                return 1;

        /* But we allow the adapter to run at a lower rate if possible */
        if ((bus->cur_bus_speed < adapter_speed) && (!ctrl->pcix_speed_capability))
                return 0;

        /* We try to set the max speed supported by both the adapter and
         * controller
         */
        if (bus->max_bus_speed < adapter_speed) {
                if (bus->cur_bus_speed == bus->max_bus_speed)
                        return 0;
                adapter_speed = bus->max_bus_speed;
        }

        writel(0x0L, ctrl->hpc_reg + LED_CONTROL);
        writeb(0x00, ctrl->hpc_reg + SLOT_ENABLE);

        set_SOGO(ctrl);
        wait_for_ctrl_irq(ctrl);

        if (adapter_speed != PCI_SPEED_133MHz_PCIX)
                reg = 0xF5;
        else
                reg = 0xF4;
        pci_write_config_byte(ctrl->pci_dev, 0x41, reg);

        reg16 = readw(ctrl->hpc_reg + NEXT_CURR_FREQ);
        reg16 &= ~0x000F;
        switch(adapter_speed) {
                case(PCI_SPEED_133MHz_PCIX):
                        reg = 0x75;
                        reg16 |= 0xB;
                        break;
                case(PCI_SPEED_100MHz_PCIX):
                        reg = 0x74;
                        reg16 |= 0xA;
                        break;
                case(PCI_SPEED_66MHz_PCIX):
                        reg = 0x73;
                        reg16 |= 0x9;
                        break;
                case(PCI_SPEED_66MHz):
                        reg = 0x73;
                        reg16 |= 0x1;
                        break;
                default: /* 33MHz PCI 2.2 */
                        reg = 0x71;
                        break;

        }
        reg16 |= 0xB << 12;
        writew(reg16, ctrl->hpc_reg + NEXT_CURR_FREQ);

        mdelay(5);

        /* Reenable interrupts */
        writel(0, ctrl->hpc_reg + INT_MASK);

        pci_write_config_byte(ctrl->pci_dev, 0x41, reg);

        /* Restart state machine */
        reg = ~0xF;
        pci_read_config_byte(ctrl->pci_dev, 0x43, &reg);
        pci_write_config_byte(ctrl->pci_dev, 0x43, reg);

        /* Only if mode change...*/
        if (((bus->cur_bus_speed == PCI_SPEED_66MHz) && (adapter_speed == PCI_SPEED_66MHz_PCIX)) ||
                ((bus->cur_bus_speed == PCI_SPEED_66MHz_PCIX) && (adapter_speed == PCI_SPEED_66MHz))) 
                        set_SOGO(ctrl);

        wait_for_ctrl_irq(ctrl);
        mdelay(1100);

        /* Restore LED/Slot state */
        writel(leds, ctrl->hpc_reg + LED_CONTROL);
        writeb(slot_power, ctrl->hpc_reg + SLOT_ENABLE);

        set_SOGO(ctrl);
        wait_for_ctrl_irq(ctrl);

        bus->cur_bus_speed = adapter_speed;
        slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

        info("Successfully changed frequency/mode for adapter in slot %d\n",
                        slot->number);
        return 0;
}

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


/**
 * board_replaced - Called after a board has been replaced in the system.
 * @func: PCI device/function information
 * @ctrl: hotplug controller
 *
 * This is only used if we don't have resources for hot add.
 * Turns power on for the board.
 * Checks to see if board is the same.
 * If board is same, reconfigures it.
 * If board isn't same, turns it back off.
 */
static u32 board_replaced(struct pci_func *func, struct controller *ctrl)
{
        struct pci_bus *bus = ctrl->pci_bus;
        u8 hp_slot;
        u8 temp_byte;
        u8 adapter_speed;
        u32 rc = 0;

        hp_slot = func->device - ctrl->slot_device_offset;

        /*
         * The switch is open.
         */
        if (readl(ctrl->hpc_reg + INT_INPUT_CLEAR) & (0x01L << hp_slot))
                rc = INTERLOCK_OPEN;
        /*
         * The board is already on
         */
        else if (is_slot_enabled (ctrl, hp_slot))
                rc = CARD_FUNCTIONING;
        else {
                mutex_lock(&ctrl->crit_sect);

                /* turn on board without attaching to the bus */
                enable_slot_power (ctrl, hp_slot);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);

                /* Change bits in slot power register to force another shift out
                 * NOTE: this is to work around the timer bug */
                temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
                writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
                writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);

                adapter_speed = get_adapter_speed(ctrl, hp_slot);
                if (bus->cur_bus_speed != adapter_speed)
                        if (set_controller_speed(ctrl, adapter_speed, hp_slot))
                                rc = WRONG_BUS_FREQUENCY;

                /* turn off board without attaching to the bus */
                disable_slot_power (ctrl, hp_slot);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);

                mutex_unlock(&ctrl->crit_sect);

                if (rc)
                        return rc;

                mutex_lock(&ctrl->crit_sect);

                slot_enable (ctrl, hp_slot);
                green_LED_blink (ctrl, hp_slot);

                amber_LED_off (ctrl, hp_slot);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);

                mutex_unlock(&ctrl->crit_sect);

                /* Wait for ~1 second because of hot plug spec */
                long_delay(1*HZ);

                /* Check for a power fault */
                if (func->status == 0xFF) {
                        /* power fault occurred, but it was benign */
                        rc = POWER_FAILURE;
                        func->status = 0;
                } else
                        rc = cpqhp_valid_replace(ctrl, func);

                if (!rc) {
                        /* It must be the same board */

                        rc = cpqhp_configure_board(ctrl, func);

                        /* If configuration fails, turn it off
                         * Get slot won't work for devices behind
                         * bridges, but in this case it will always be
                         * called for the "base" bus/dev/func of an
                         * adapter.
                         */

                        mutex_lock(&ctrl->crit_sect);

                        amber_LED_on (ctrl, hp_slot);
                        green_LED_off (ctrl, hp_slot);
                        slot_disable (ctrl, hp_slot);

                        set_SOGO(ctrl);

                        /* Wait for SOBS to be unset */
                        wait_for_ctrl_irq (ctrl);

                        mutex_unlock(&ctrl->crit_sect);

                        if (rc)
                                return rc;
                        else
                                return 1;

                } else {
                        /* Something is wrong

                         * Get slot won't work for devices behind bridges, but
                         * in this case it will always be called for the "base"
                         * bus/dev/func of an adapter.
                         */

                        mutex_lock(&ctrl->crit_sect);

                        amber_LED_on (ctrl, hp_slot);
                        green_LED_off (ctrl, hp_slot);
                        slot_disable (ctrl, hp_slot);

                        set_SOGO(ctrl);

                        /* Wait for SOBS to be unset */
                        wait_for_ctrl_irq (ctrl);

                        mutex_unlock(&ctrl->crit_sect);
                }

        }
        return rc;

}


/**
 * board_added - Called after a board has been added to the system.
 * @func: PCI device/function info
 * @ctrl: hotplug controller
 *
 * Turns power on for the board.
 * Configures board.
 */
static u32 board_added(struct pci_func *func, struct controller *ctrl)
{
        u8 hp_slot;
        u8 temp_byte;
        u8 adapter_speed;
        int index;
        u32 temp_register = 0xFFFFFFFF;
        u32 rc = 0;
        struct pci_func *new_slot = NULL;
        struct pci_bus *bus = ctrl->pci_bus;
        struct slot *p_slot;
        struct resource_lists res_lists;

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

        mutex_lock(&ctrl->crit_sect);

        /* turn on board without attaching to the bus */
        enable_slot_power(ctrl, hp_slot);

        set_SOGO(ctrl);

        /* Wait for SOBS to be unset */
        wait_for_ctrl_irq (ctrl);

        /* Change bits in slot power register to force another shift out
         * NOTE: this is to work around the timer bug
         */
        temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
        writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
        writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);

        set_SOGO(ctrl);

        /* Wait for SOBS to be unset */
        wait_for_ctrl_irq (ctrl);

        adapter_speed = get_adapter_speed(ctrl, hp_slot);
        if (bus->cur_bus_speed != adapter_speed)
                if (set_controller_speed(ctrl, adapter_speed, hp_slot))
                        rc = WRONG_BUS_FREQUENCY;

        /* turn off board without attaching to the bus */
        disable_slot_power (ctrl, hp_slot);

        set_SOGO(ctrl);

        /* Wait for SOBS to be unset */
        wait_for_ctrl_irq(ctrl);

        mutex_unlock(&ctrl->crit_sect);

        if (rc)
                return rc;

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

        /* turn on board and blink green LED */

        dbg("%s: before down\n", __func__);
        mutex_lock(&ctrl->crit_sect);
        dbg("%s: after down\n", __func__);

        dbg("%s: before slot_enable\n", __func__);
        slot_enable (ctrl, hp_slot);

        dbg("%s: before green_LED_blink\n", __func__);
        green_LED_blink (ctrl, hp_slot);

        dbg("%s: before amber_LED_blink\n", __func__);
        amber_LED_off (ctrl, hp_slot);

        dbg("%s: before set_SOGO\n", __func__);
        set_SOGO(ctrl);

        /* Wait for SOBS to be unset */
        dbg("%s: before wait_for_ctrl_irq\n", __func__);
        wait_for_ctrl_irq (ctrl);
        dbg("%s: after wait_for_ctrl_irq\n", __func__);

        dbg("%s: before up\n", __func__);
        mutex_unlock(&ctrl->crit_sect);
        dbg("%s: after up\n", __func__);

        /* Wait for ~1 second because of hot plug spec */
        dbg("%s: before long_delay\n", __func__);
        long_delay(1*HZ);
        dbg("%s: after long_delay\n", __func__);

        dbg("%s: func status = %x\n", __func__, 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", __func__, temp_register);
                rc = POWER_FAILURE;
                func->status = 0;
        } else {
                /* Get vendor/device ID u32 */
                ctrl->pci_bus->number = func->bus;
                rc = pci_bus_read_config_dword (ctrl->pci_bus, PCI_DEVFN(func->device, func->function), PCI_VENDOR_ID, &temp_register);
                dbg("%s: pci_read_config_dword returns %d\n", __func__, rc);
                dbg("%s: temp_register is %x\n", __func__, temp_register);

                if (rc != 0) {
                        /* Something's wrong here */
                        temp_register = 0xFFFFFFFF;
                        dbg("%s: temp register set to %x by error\n", __func__, temp_register);
                }
                /* Preset return code.  It will be changed later if things go okay. */
                rc = NO_ADAPTER_PRESENT;
        }

        /* All F's is an empty slot or an invalid board */
        if (temp_register != 0xFFFFFFFF) {
                res_lists.io_head = ctrl->io_head;
                res_lists.mem_head = ctrl->mem_head;
                res_lists.p_mem_head = ctrl->p_mem_head;
                res_lists.bus_head = ctrl->bus_head;
                res_lists.irqs = NULL;

                rc = configure_new_device(ctrl, func, 0, &res_lists);

                dbg("%s: back from configure_new_device\n", __func__);
                ctrl->io_head = res_lists.io_head;
                ctrl->mem_head = res_lists.mem_head;
                ctrl->p_mem_head = res_lists.p_mem_head;
                ctrl->bus_head = res_lists.bus_head;

                cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
                cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
                cpqhp_resource_sort_and_combine(&(ctrl->io_head));
                cpqhp_resource_sort_and_combine(&(ctrl->bus_head));

                if (rc) {
                        mutex_lock(&ctrl->crit_sect);

                        amber_LED_on (ctrl, hp_slot);
                        green_LED_off (ctrl, hp_slot);
                        slot_disable (ctrl, hp_slot);

                        set_SOGO(ctrl);

                        /* Wait for SOBS to be unset */
                        wait_for_ctrl_irq (ctrl);

                        mutex_unlock(&ctrl->crit_sect);
                        return rc;
                } else {
                        cpqhp_save_slot_config(ctrl, func);
                }


                func->status = 0;
                func->switch_save = 0x10;
                func->is_a_board = 0x01;

                /* next, we will instantiate the linux pci_dev structures (with
                 * appropriate driver notification, if already present) */
                dbg("%s: configure linux pci_dev structure\n", __func__);
                index = 0;
                do {
                        new_slot = cpqhp_slot_find(ctrl->bus, func->device, index++);
                        if (new_slot && !new_slot->pci_dev)
                                cpqhp_configure_device(ctrl, new_slot);
                } while (new_slot);

                mutex_lock(&ctrl->crit_sect);

                green_LED_on (ctrl, hp_slot);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);

                mutex_unlock(&ctrl->crit_sect);
        } else {
                mutex_lock(&ctrl->crit_sect);

                amber_LED_on (ctrl, hp_slot);
                green_LED_off (ctrl, hp_slot);
                slot_disable (ctrl, hp_slot);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);

                mutex_unlock(&ctrl->crit_sect);

                return rc;
        }
        return 0;
}


/**
 * remove_board - Turns off slot and LEDs
 * @func: PCI device/function info
 * @replace_flag: whether replacing or adding a new device
 * @ctrl: target controller
 */
static u32 remove_board(struct pci_func * func, u32 replace_flag, struct controller * ctrl)
{
        int index;
        u8 skip = 0;
        u8 device;
        u8 hp_slot;
        u8 temp_byte;
        u32 rc;
        struct resource_lists res_lists;
        struct pci_func *temp_func;

        if (cpqhp_unconfigure_device(func))
                return 1;

        device = func->device;

        hp_slot = func->device - ctrl->slot_device_offset;
        dbg("In %s, hp_slot = %d\n", __func__, hp_slot);

        /* When we get here, it is safe to change base address registers.
         * We will attempt to save the base address register lengths */
        if (replace_flag || !ctrl->add_support)
                rc = cpqhp_save_base_addr_length(ctrl, func);
        else if (!func->bus_head && !func->mem_head &&
                 !func->p_mem_head && !func->io_head) {
                /* Here we check to see if we've saved any of the board's
                 * resources already.  If so, we'll skip the attempt to
                 * determine what's being used. */
                index = 0;
                temp_func = cpqhp_slot_find(func->bus, func->device, index++);
                while (temp_func) {
                        if (temp_func->bus_head || temp_func->mem_head
                            || temp_func->p_mem_head || temp_func->io_head) {
                                skip = 1;
                                break;
                        }
                        temp_func = cpqhp_slot_find(temp_func->bus, temp_func->device, index++);
                }

                if (!skip)
                        rc = cpqhp_save_used_resources(ctrl, func);
        }
        /* Change status to shutdown */
        if (func->is_a_board)
                func->status = 0x01;
        func->configured = 0;

        mutex_lock(&ctrl->crit_sect);

        green_LED_off (ctrl, hp_slot);
        slot_disable (ctrl, hp_slot);

        set_SOGO(ctrl);

        /* turn off SERR for slot */
        temp_byte = readb(ctrl->hpc_reg + SLOT_SERR);
        temp_byte &= ~(0x01 << hp_slot);
        writeb(temp_byte, ctrl->hpc_reg + SLOT_SERR);

        /* Wait for SOBS to be unset */
        wait_for_ctrl_irq (ctrl);

        mutex_unlock(&ctrl->crit_sect);

        if (!replace_flag && ctrl->add_support) {
                while (func) {
                        res_lists.io_head = ctrl->io_head;
                        res_lists.mem_head = ctrl->mem_head;
                        res_lists.p_mem_head = ctrl->p_mem_head;
                        res_lists.bus_head = ctrl->bus_head;

                        cpqhp_return_board_resources(func, &res_lists);

                        ctrl->io_head = res_lists.io_head;
                        ctrl->mem_head = res_lists.mem_head;
                        ctrl->p_mem_head = res_lists.p_mem_head;
                        ctrl->bus_head = res_lists.bus_head;

                        cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
                        cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
                        cpqhp_resource_sort_and_combine(&(ctrl->io_head));
                        cpqhp_resource_sort_and_combine(&(ctrl->bus_head));

                        if (is_bridge(func)) {
                                bridge_slot_remove(func);
                        } else
                                slot_remove(func);

                        func = cpqhp_slot_find(ctrl->bus, device, 0);
                }

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

                if (func == NULL)
                        return 1;

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

        return 0;
}

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


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

        while (1) {
                dbg("!!!!event_thread sleeping\n");
                set_current_state(TASK_INTERRUPTIBLE);
                schedule();

                if (kthread_should_stop())
                        break;
                /* Do stuff here */
                if (pushbutton_pending)
                        cpqhp_pushbutton_thread(pushbutton_pending);
                else
                        for (ctrl = cpqhp_ctrl_list; ctrl; ctrl=ctrl->next)
                                interrupt_event_handler(ctrl);
        }
        dbg("event_thread signals exit\n");
        return 0;
}

int cpqhp_event_start_thread(void)
{
        cpqhp_event_thread = kthread_run(event_thread, NULL, "phpd_event");
        if (IS_ERR(cpqhp_event_thread)) {
                err ("Can't start up our event thread\n");
                return PTR_ERR(cpqhp_event_thread);
        }

        return 0;
}


void cpqhp_event_stop_thread(void)
{
        kthread_stop(cpqhp_event_thread);
}


static int update_slot_info(struct controller *ctrl, struct slot *slot)
{
        struct hotplug_slot_info *info;
        int result;

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

        info->power_status = get_slot_enabled(ctrl, slot);
        info->attention_status = cpq_get_attention_status(ctrl, slot);
        info->latch_status = cpq_get_latch_status(ctrl, slot);
        info->adapter_status = get_presence_status(ctrl, slot);
        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;
        struct slot *p_slot;

        while (change) {
                change = 0;

                for (loop = 0; loop < 10; loop++) {
                        /* dbg("loop %d\n", loop); */
                        if (ctrl->event_queue[loop].event_type != 0) {
                                hp_slot = ctrl->event_queue[loop].hp_slot;

                                func = cpqhp_slot_find(ctrl->bus, (hp_slot + ctrl->slot_device_offset), 0);
                                if (!func)
                                        return;

                                p_slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
                                if (!p_slot)
                                        return;

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

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

                                        mutex_lock(&ctrl->crit_sect);

                                        if (p_slot->state == BLINKINGOFF_STATE) {
                                                /* slot is on */
                                                dbg("turn on green LED\n");
                                                green_LED_on (ctrl, hp_slot);
                                        } else if (p_slot->state == BLINKINGON_STATE) {
                                                /* slot is off */
                                                dbg("turn off green LED\n");
                                                green_LED_off (ctrl, hp_slot);
                                        }

                                        info(msg_button_cancel, p_slot->number);

                                        p_slot->state = STATIC_STATE;

                                        amber_LED_off (ctrl, hp_slot);

                                        set_SOGO(ctrl);

                                        /* Wait for SOBS to be unset */
                                        wait_for_ctrl_irq (ctrl);

                                        mutex_unlock(&ctrl->crit_sect);
                                }
                                /*** button Released (No action on press...) */
                                else if (ctrl->event_queue[loop].event_type == INT_BUTTON_RELEASE) {
                                        dbg("button release\n");

                                        if (is_slot_enabled (ctrl, hp_slot)) {
                                                dbg("slot is on\n");
                                                p_slot->state = BLINKINGOFF_STATE;
                                                info(msg_button_off, p_slot->number);
                                        } else {
                                                dbg("slot is off\n");
                                                p_slot->state = BLINKINGON_STATE;
                                                info(msg_button_on, p_slot->number);
                                        }
                                        mutex_lock(&ctrl->crit_sect);

                                        dbg("blink green LED and turn off amber\n");

                                        amber_LED_off (ctrl, hp_slot);
                                        green_LED_blink (ctrl, hp_slot);

                                        set_SOGO(ctrl);

                                        /* Wait for SOBS to be unset */
                                        wait_for_ctrl_irq (ctrl);

                                        mutex_unlock(&ctrl->crit_sect);
                                        init_timer(&p_slot->task_event);
                                        p_slot->hp_slot = hp_slot;
                                        p_slot->ctrl = ctrl;
/*                                      p_slot->physical_slot = physical_slot; */
                                        p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
                                        p_slot->task_event.function = pushbutton_helper_thread;
                                        p_slot->task_event.data = (u32) p_slot;

                                        dbg("add_timer p_slot = %p\n", p_slot);
                                        add_timer(&p_slot->task_event);
                                }
                                /***********POWER FAULT */
                                else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
                                        dbg("power fault\n");
                                } else {
                                        /* refresh notification */
                                        update_slot_info(ctrl, p_slot);
                                }

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

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

        return;
}


/**
 * cpqhp_pushbutton_thread - handle pushbutton events
 * @slot: target slot (struct)
 *
 * Scheduled procedure to handle blocking stuff for the pushbuttons.
 * Handles all pending events and exits.
 */
void cpqhp_pushbutton_thread(unsigned long slot)
{
        u8 hp_slot;
        u8 device;
        struct pci_func *func;
        struct slot *p_slot = (struct slot *) slot;
        struct controller *ctrl = (struct controller *) p_slot->ctrl;

        pushbutton_pending = 0;
        hp_slot = p_slot->hp_slot;

        device = p_slot->device;

        if (is_slot_enabled(ctrl, hp_slot)) {
                p_slot->state = POWEROFF_STATE;
                /* power Down board */
                func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
                dbg("In power_down_board, func = %p, ctrl = %p\n", func, ctrl);
                if (!func) {
                        dbg("Error! func NULL in %s\n", __func__);
                        return ;
                }

                if (cpqhp_process_SS(ctrl, func) != 0) {
                        amber_LED_on(ctrl, hp_slot);
                        green_LED_on(ctrl, hp_slot);

                        set_SOGO(ctrl);

                        /* Wait for SOBS to be unset */
                        wait_for_ctrl_irq(ctrl);
                }

                p_slot->state = STATIC_STATE;
        } else {
                p_slot->state = POWERON_STATE;
                /* slot is off */

                func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
                dbg("In add_board, func = %p, ctrl = %p\n", func, ctrl);
                if (!func) {
                        dbg("Error! func NULL in %s\n", __func__);
                        return ;
                }

                if (ctrl != NULL) {
                        if (cpqhp_process_SI(ctrl, func) != 0) {
                                amber_LED_on(ctrl, hp_slot);
                                green_LED_off(ctrl, hp_slot);

                                set_SOGO(ctrl);

                                /* Wait for SOBS to be unset */
                                wait_for_ctrl_irq (ctrl);
                        }
                }

                p_slot->state = STATIC_STATE;
        }

        return;
}


int cpqhp_process_SI(struct controller *ctrl, struct pci_func *func)
{
        u8 device, hp_slot;
        u16 temp_word;
        u32 tempdword;
        int rc;
        struct slot* p_slot;
        int physical_slot = 0;

        tempdword = 0;

        device = func->device;
        hp_slot = device - ctrl->slot_device_offset;

        p_slot = cpqhp_find_slot(ctrl, device);
        if (p_slot)
                physical_slot = p_slot->number;

        /* Check to see if the interlock is closed */
        tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);

        if (tempdword & (0x01 << hp_slot)) {
                return 1;
        }

        if (func->is_a_board) {
                rc = board_replaced(func, ctrl);
        } else {
                /* add board */
                slot_remove(func);

                func = cpqhp_slot_create(ctrl->bus);
                if (func == NULL)
                        return 1;

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

                /* We have to save the presence info for these slots */
                temp_word = ctrl->ctrl_int_comp >> 16;
                func->presence_save = (temp_word >> hp_slot) & 0x01;
                func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;

                if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
                        func->switch_save = 0;
                } else {
                        func->switch_save = 0x10;
                }

                rc = board_added(func, ctrl);
                if (rc) {
                        if (is_bridge(func)) {
                                bridge_slot_remove(func);
                        } else
                                slot_remove(func);

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

                        if (func == NULL)
                                return 1;

                        func->bus = ctrl->bus;
                        func->device = device;
                        func->function = 0;
                        func->configured = 0;
                        func->is_a_board = 0;

                        /* We have to save the presence info for these slots */
                        temp_word = ctrl->ctrl_int_comp >> 16;
                        func->presence_save = (temp_word >> hp_slot) & 0x01;
                        func->presence_save |=
                        (temp_word >> (hp_slot + 7)) & 0x02;

                        if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
                                func->switch_save = 0;
                        } else {
                                func->switch_save = 0x10;
                        }
                }
        }

        if (rc) {
                dbg("%s: rc = %d\n", __func__, rc);
        }

        if (p_slot)
                update_slot_info(ctrl, p_slot);

        return rc;
}


int cpqhp_process_SS(struct controller *ctrl, struct pci_func *func)
{
        u8 device, class_code, header_type, BCR;
        u8 index = 0;
        u8 replace_flag;
        u32 rc = 0;
        unsigned int devfn;
        struct slot* p_slot;
        struct pci_bus *pci_bus = ctrl->pci_bus;
        int physical_slot=0;

        device = func->device;
        func = cpqhp_slot_find(ctrl->bus, device, index++);
        p_slot = cpqhp_find_slot(ctrl, device);
        if (p_slot) {
                physical_slot = p_slot->number;
        }

        /* Make sure there are no video controllers here */
        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 = cpqhp_slot_find(ctrl->bus, device, index++);
        }

        func = cpqhp_slot_find(ctrl->bus, device, 0);
        if ((func != NULL) && !rc) {
                /* FIXME: Replace flag should be passed into process_SS */
                replace_flag = !(ctrl->add_support);
                rc = remove_board(func, replace_flag, ctrl);
        } else if (!rc) {
                rc = 1;
        }

        if (p_slot)
                update_slot_info(ctrl, p_slot);

        return rc;
}

/**
 * switch_leds - switch the leds, go from one site to the other.
 * @ctrl: controller to use
 * @num_of_slots: number of slots to use
 * @work_LED: LED control value
 * @direction: 1 to start from the left side, 0 to start right.
 */
static void switch_leds(struct controller *ctrl, const int num_of_slots,
                        u32 *work_LED, const int direction)
{
        int loop;

        for (loop = 0; loop < num_of_slots; loop++) {
                if (direction)
                        *work_LED = *work_LED >> 1;
                else
                        *work_LED = *work_LED << 1;
                writel(*work_LED, ctrl->hpc_reg + LED_CONTROL);

                set_SOGO(ctrl);

                /* Wait for SOGO interrupt */
                wait_for_ctrl_irq(ctrl);

                /* Get ready for next iteration */
                long_delay((2*HZ)/10);
        }
}

/**
 * cpqhp_hardware_test - runs hardware tests
 * @ctrl: target controller
 * @test_num: the number written to the "test" file in sysfs.
 *
 * For hot plug ctrl folks to play with.
 */
int cpqhp_hardware_test(struct controller *ctrl, int test_num)
{
        u32 save_LED;
        u32 work_LED;
        int loop;
        int num_of_slots;

        num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0f;

        switch (test_num) {
        case 1:
                /* Do stuff here! */

                /* Do that funky LED thing */
                /* so we can restore them later */
                save_LED = readl(ctrl->hpc_reg + LED_CONTROL);
                work_LED = 0x01010101;
                switch_leds(ctrl, num_of_slots, &work_LED, 0);
                switch_leds(ctrl, num_of_slots, &work_LED, 1);
                switch_leds(ctrl, num_of_slots, &work_LED, 0);
                switch_leds(ctrl, num_of_slots, &work_LED, 1);

                work_LED = 0x01010000;
                writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
                switch_leds(ctrl, num_of_slots, &work_LED, 0);
                switch_leds(ctrl, num_of_slots, &work_LED, 1);
                work_LED = 0x00000101;
                writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
                switch_leds(ctrl, num_of_slots, &work_LED, 0);
                switch_leds(ctrl, num_of_slots, &work_LED, 1);

                work_LED = 0x01010000;
                writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
                for (loop = 0; loop < num_of_slots; loop++) {
                        set_SOGO(ctrl);

                        /* Wait for SOGO interrupt */
                        wait_for_ctrl_irq (ctrl);

                        /* Get ready for next iteration */
                        long_delay((3*HZ)/10);
                        work_LED = work_LED >> 16;
                        writel(work_LED, ctrl->hpc_reg + LED_CONTROL);

                        set_SOGO(ctrl);

                        /* Wait for SOGO interrupt */
                        wait_for_ctrl_irq (ctrl);

                        /* Get ready for next iteration */
                        long_delay((3*HZ)/10);
                        work_LED = work_LED << 16;
                        writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
                        work_LED = work_LED << 1;
                        writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
                }

                /* put it back the way it was */
                writel(save_LED, ctrl->hpc_reg + LED_CONTROL);

                set_SOGO(ctrl);

                /* Wait for SOBS to be unset */
                wait_for_ctrl_irq (ctrl);
                break;
        case 2:
                /* Do other stuff here! */
                break;
        case 3:
                /* and more... */
                break;
        }
        return 0;
}


/**
 * configure_new_device - Configures the PCI header information of one board.
 * @ctrl: pointer to controller structure
 * @func: pointer to function structure
 * @behind_bridge: 1 if this is a recursive call, 0 if not
 * @resources: pointer to set of resource lists
 *
 * Returns 0 if success.
 */
static u32 configure_new_device(struct controller * ctrl, struct pci_func * func,
                                 u8 behind_bridge, struct resource_lists * resources)
{
        u8 temp_byte, function, max_functions, stop_it;
        int rc;
        u32 ID;
        struct pci_func *new_slot;
        int index;

        new_slot = func;

        dbg("%s\n", __func__);
        /* Check for Multi-function device */
        ctrl->pci_bus->number = func->bus;
        rc = pci_bus_read_config_byte (ctrl->pci_bus, PCI_DEVFN(func->device, func->function), 0x0E, &temp_byte);
        if (rc) {
                dbg("%s: rc = %d\n", __func__, rc);
                return rc;
        }

        if (temp_byte & 0x80)   /* Multi-function device */
                max_functions = 8;
        else
                max_functions = 1;

        function = 0;

        do {
                rc = configure_new_function(ctrl, new_slot, behind_bridge, resources);

                if (rc) {
                        dbg("configure_new_function failed %d\n",rc);
                        index = 0;

                        while (new_slot) {
                                new_slot = cpqhp_slot_find(new_slot->bus, new_slot->device, index++);

                                if (new_slot)
                                        cpqhp_return_board_resources(new_slot, resources);
                        }

                        return rc;
                }

                function++;

                stop_it = 0;

                /* The following loop skips to the next present function
                 * and creates a board structure */

                while ((function < max_functions) && (!stop_it)) {
                        pci_bus_read_config_dword (ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID);

                        if (ID == 0xFFFFFFFF) {
                                function++;
                        } else {
                                /* Setup slot structure. */
                                new_slot = cpqhp_slot_create(func->bus);

                                if (new_slot == NULL)
                                        return 1;

                                new_slot->bus = func->bus;
                                new_slot->device = func->device;
                                new_slot->function = function;
                                new_slot->is_a_board = 1;
                                new_slot->status = 0;

                                stop_it++;
                        }
                }

        } while (function < max_functions);
        dbg("returning from configure_new_device\n");

        return 0;
}


/*
 * Configuration logic that involves the hotplug data structures and
 * their bookkeeping
 */


/**
 * configure_new_function - Configures the PCI header information of one device
 * @ctrl: pointer to controller structure
 * @func: pointer to function structure
 * @behind_bridge: 1 if this is a recursive call, 0 if not
 * @resources: pointer to set of resource lists
 *
 * Calls itself recursively for bridged devices.
 * Returns 0 if success.
 */
static int configure_new_function(struct controller *ctrl, struct pci_func *func,
                                   u8 behind_bridge,
                                   struct resource_lists *resources)
{
        int cloop;
        u8 IRQ = 0;
        u8 temp_byte;
        u8 device;
        u8 class_code;
        u16 command;
        u16 temp_word;
        u32 temp_dword;
        u32 rc;
        u32 temp_register;
        u32 base;
        u32 ID;
        unsigned int devfn;
        struct pci_resource *mem_node;
        struct pci_resource *p_mem_node;
        struct pci_resource *io_node;
        struct pci_resource *bus_node;
        struct pci_resource *hold_mem_node;
        struct pci_resource *hold_p_mem_node;
        struct pci_resource *hold_IO_node;
        struct pci_resource *hold_bus_node;
        struct irq_mapping irqs;
        struct pci_func *new_slot;
        struct pci_bus *pci_bus;
        struct resource_lists temp_resources;

        pci_bus = ctrl->pci_bus;
        pci_bus->number = func->bus;
        devfn = PCI_DEVFN(func->device, func->function);

        /* Check for Bridge */
        rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &temp_byte);
        if (rc)
                return rc;

        if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
                /* set Primary bus */
                dbg("set Primary bus = %d\n", func->bus);
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_PRIMARY_BUS, func->bus);
                if (rc)
                        return rc;

                /* find range of busses to use */
                dbg("find ranges of buses to use\n");
                bus_node = get_max_resource(&(resources->bus_head), 1);

                /* If we don't have any busses to allocate, we can't continue */
                if (!bus_node)
                        return -ENOMEM;

                /* set Secondary bus */
                temp_byte = bus_node->base;
                dbg("set Secondary bus = %d\n", bus_node->base);
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SECONDARY_BUS, temp_byte);
                if (rc)
                        return rc;

                /* set subordinate bus */
                temp_byte = bus_node->base + bus_node->length - 1;
                dbg("set subordinate bus = %d\n", bus_node->base + bus_node->length - 1);
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
                if (rc)
                        return rc;

                /* set subordinate Latency Timer and base Latency Timer */
                temp_byte = 0x40;
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
                if (rc)
                        return rc;
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
                if (rc)
                        return rc;

                /* set Cache Line size */
                temp_byte = 0x08;
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
                if (rc)
                        return rc;

                /* Setup the IO, memory, and prefetchable windows */
                io_node = get_max_resource(&(resources->io_head), 0x1000);
                if (!io_node)
                        return -ENOMEM;
                mem_node = get_max_resource(&(resources->mem_head), 0x100000);
                if (!mem_node)
                        return -ENOMEM;
                p_mem_node = get_max_resource(&(resources->p_mem_head), 0x100000);
                if (!p_mem_node)
                        return -ENOMEM;
                dbg("Setup the IO, memory, and prefetchable windows\n");
                dbg("io_node\n");
                dbg("(base, len, next) (%x, %x, %p)\n", io_node->base,
                                        io_node->length, io_node->next);
                dbg("mem_node\n");
                dbg("(base, len, next) (%x, %x, %p)\n", mem_node->base,
                                        mem_node->length, mem_node->next);
                dbg("p_mem_node\n");
                dbg("(base, len, next) (%x, %x, %p)\n", p_mem_node->base,
                                        p_mem_node->length, p_mem_node->next);

                /* set up the IRQ info */
                if (!resources->irqs) {
                        irqs.barber_pole = 0;
                        irqs.interrupt[0] = 0;
                        irqs.interrupt[1] = 0;
                        irqs.interrupt[2] = 0;
                        irqs.interrupt[3] = 0;
                        irqs.valid_INT = 0;
                } else {
                        irqs.barber_pole = resources->irqs->barber_pole;
                        irqs.interrupt[0] = resources->irqs->interrupt[0];
                        irqs.interrupt[1] = resources->irqs->interrupt[1];
                        irqs.interrupt[2] = resources->irqs->interrupt[2];
                        irqs.interrupt[3] = resources->irqs->interrupt[3];
                        irqs.valid_INT = resources->irqs->valid_INT;
                }

                /* set up resource lists that are now aligned on top and bottom
                 * for anything behind the bridge. */
                temp_resources.bus_head = bus_node;
                temp_resources.io_head = io_node;
                temp_resources.mem_head = mem_node;
                temp_resources.p_mem_head = p_mem_node;
                temp_resources.irqs = &irqs;

                /* Make copies of the nodes we are going to pass down so that
                 * if there is a problem,we can just use these to free resources
                 */
                hold_bus_node = kmalloc(sizeof(*hold_bus_node), GFP_KERNEL);
                hold_IO_node = kmalloc(sizeof(*hold_IO_node), GFP_KERNEL);
                hold_mem_node = kmalloc(sizeof(*hold_mem_node), GFP_KERNEL);
                hold_p_mem_node = kmalloc(sizeof(*hold_p_mem_node), GFP_KERNEL);

                if (!hold_bus_node || !hold_IO_node || !hold_mem_node || !hold_p_mem_node) {
                        kfree(hold_bus_node);
                        kfree(hold_IO_node);
                        kfree(hold_mem_node);
                        kfree(hold_p_mem_node);

                        return 1;
                }

                memcpy(hold_bus_node, bus_node, sizeof(struct pci_resource));

                bus_node->base += 1;
                bus_node->length -= 1;
                bus_node->next = NULL;

                /* If we have IO resources copy them and fill in the bridge's
                 * IO range registers */
                memcpy(hold_IO_node, io_node, sizeof(struct pci_resource));
                io_node->next = NULL;

                /* set IO base and Limit registers */
                temp_byte = io_node->base >> 8;
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_BASE, temp_byte);

                temp_byte = (io_node->base + io_node->length - 1) >> 8;
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);

                /* Copy the memory resources and fill in the bridge's memory
                 * range registers.
                 */
                memcpy(hold_mem_node, mem_node, sizeof(struct pci_resource));
                mem_node->next = NULL;

                /* set Mem base and Limit registers */
                temp_word = mem_node->base >> 16;
                rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);

                temp_word = (mem_node->base + mem_node->length - 1) >> 16;
                rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);

                memcpy(hold_p_mem_node, p_mem_node, sizeof(struct pci_resource));
                p_mem_node->next = NULL;

                /* set Pre Mem base and Limit registers */
                temp_word = p_mem_node->base >> 16;
                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);

                temp_word = (p_mem_node->base + p_mem_node->length - 1) >> 16;
                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);

                /* Adjust this to compensate for extra adjustment in first loop
                 */
                irqs.barber_pole--;

                rc = 0;

                /* Here we actually find the devices and configure them */
                for (device = 0; (device <= 0x1F) && !rc; device++) {
                        irqs.barber_pole = (irqs.barber_pole + 1) & 0x03;

                        ID = 0xFFFFFFFF;
                        pci_bus->number = hold_bus_node->base;
                        pci_bus_read_config_dword (pci_bus, PCI_DEVFN(device, 0), 0x00, &ID);
                        pci_bus->number = func->bus;

                        if (ID != 0xFFFFFFFF) {   /*  device present */
                                /* Setup slot structure. */
                                new_slot = cpqhp_slot_create(hold_bus_node->base);

                                if (new_slot == NULL) {
                                        rc = -ENOMEM;
                                        continue;
                                }

                                new_slot->bus = hold_bus_node->base;
                                new_slot->device = device;
                                new_slot->function = 0;
                                new_slot->is_a_board = 1;
                                new_slot->status = 0;

                                rc = configure_new_device(ctrl, new_slot, 1, &temp_resources);
                                dbg("configure_new_device rc=0x%x\n",rc);
                        }       /* End of IF (device in slot?) */
                }               /* End of FOR loop */

                if (rc)
                        goto free_and_out;
                /* save the interrupt routing information */
                if (resources->irqs) {
                        resources->irqs->interrupt[0] = irqs.interrupt[0];
                        resources->irqs->interrupt[1] = irqs.interrupt[1];
                        resources->irqs->interrupt[2] = irqs.interrupt[2];
                        resources->irqs->interrupt[3] = irqs.interrupt[3];
                        resources->irqs->valid_INT = irqs.valid_INT;
                } else if (!behind_bridge) {
                        /* We need to hook up the interrupts here */
                        for (cloop = 0; cloop < 4; cloop++) {
                                if (irqs.valid_INT & (0x01 << cloop)) {
                                        rc = cpqhp_set_irq(func->bus, func->device,
                                                           cloop + 1, irqs.interrupt[cloop]);
                                        if (rc)
                                                goto free_and_out;
                                }
                        }       /* end of for loop */
                }
                /* Return unused bus resources
                 * First use the temporary node to store information for
                 * the board */
                if (bus_node && temp_resources.bus_head) {
                        hold_bus_node->length = bus_node->base - hold_bus_node->base;

                        hold_bus_node->next = func->bus_head;
                        func->bus_head = hold_bus_node;

                        temp_byte = temp_resources.bus_head->base - 1;

                        /* set subordinate bus */
                        rc = pci_bus_write_config_byte (pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);

                        if (temp_resources.bus_head->length == 0) {
                                kfree(temp_resources.bus_head);
                                temp_resources.bus_head = NULL;
                        } else {
                                return_resource(&(resources->bus_head), temp_resources.bus_head);
                        }
                }

                /* If we have IO space available and there is some left,
                 * return the unused portion */
                if (hold_IO_node && temp_resources.io_head) {
                        io_node = do_pre_bridge_resource_split(&(temp_resources.io_head),
                                                               &hold_IO_node, 0x1000);

                        /* Check if we were able to split something off */
                        if (io_node) {
                                hold_IO_node->base = io_node->base + io_node->length;

                                temp_byte = (hold_IO_node->base) >> 8;
                                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_IO_BASE, temp_byte);

                                return_resource(&(resources->io_head), io_node);
                        }

                        io_node = do_bridge_resource_split(&(temp_resources.io_head), 0x1000);

                        /* Check if we were able to split something off */
                        if (io_node) {
                                /* First use the temporary node to store
                                 * information for the board */
                                hold_IO_node->length = io_node->base - hold_IO_node->base;

                                /* If we used any, add it to the board's list */
                                if (hold_IO_node->length) {
                                        hold_IO_node->next = func->io_head;
                                        func->io_head = hold_IO_node;

                                        temp_byte = (io_node->base - 1) >> 8;
                                        rc = pci_bus_write_config_byte (pci_bus, devfn, PCI_IO_LIMIT, temp_byte);

                                        return_resource(&(resources->io_head), io_node);
                                } else {
                                        /* it doesn't need any IO */
                                        temp_word = 0x0000;
                                        rc = pci_bus_write_config_word (pci_bus, devfn, PCI_IO_LIMIT, temp_word);

                                        return_resource(&(resources->io_head), io_node);
                                        kfree(hold_IO_node);
                                }
                        } else {
                                /* it used most of the range */
                                hold_IO_node->next = func->io_head;
                                func->io_head = hold_IO_node;
                        }
                } else if (hold_IO_node) {
                        /* it used the whole range */
                        hold_IO_node->next = func->io_head;
                        func->io_head = hold_IO_node;
                }
                /* If we have memory space available and there is some left,
                 * return the unused portion */
                if (hold_mem_node && temp_resources.mem_head) {
                        mem_node = do_pre_bridge_resource_split(&(temp_resources.  mem_head),
                                                                &hold_mem_node, 0x100000);

                        /* Check if we were able to split something off */
                        if (mem_node) {
                                hold_mem_node->base = mem_node->base + mem_node->length;

                                temp_word = (hold_mem_node->base) >> 16;
                                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_MEMORY_BASE, temp_word);

                                return_resource(&(resources->mem_head), mem_node);
                        }

                        mem_node = do_bridge_resource_split(&(temp_resources.mem_head), 0x100000);

                        /* Check if we were able to split something off */
                        if (mem_node) {
                                /* First use the temporary node to store
                                 * information for the board */
                                hold_mem_node->length = mem_node->base - hold_mem_node->base;

                                if (hold_mem_node->length) {
                                        hold_mem_node->next = func->mem_head;
                                        func->mem_head = hold_mem_node;

                                        /* configure end address */
                                        temp_word = (mem_node->base - 1) >> 16;
                                        rc = pci_bus_write_config_word (pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);

                                        /* Return unused resources to the pool */
                                        return_resource(&(resources->mem_head), mem_node);
                                } else {
                                        /* it doesn't need any Mem */
                                        temp_word = 0x0000;
                                        rc = pci_bus_write_config_word (pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);

                                        return_resource(&(resources->mem_head), mem_node);
                                        kfree(hold_mem_node);
                                }
                        } else {
                                /* it used most of the range */
                                hold_mem_node->next = func->mem_head;
                                func->mem_head = hold_mem_node;
                        }
                } else if (hold_mem_node) {
                        /* it used the whole range */
                        hold_mem_node->next = func->mem_head;
                        func->mem_head = hold_mem_node;
                }
                /* If we have prefetchable memory space available and there
                 * is some left at the end, return the unused portion */
                if (temp_resources.p_mem_head) {
                        p_mem_node = do_pre_bridge_resource_split(&(temp_resources.p_mem_head),
                                                                  &hold_p_mem_node, 0x100000);

                        /* Check if we were able to split something off */
                        if (p_mem_node) {
                                hold_p_mem_node->base = p_mem_node->base + p_mem_node->length;

                                temp_word = (hold_p_mem_node->base) >> 16;
                                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);

                                return_resource(&(resources->p_mem_head), p_mem_node);
                        }

                        p_mem_node = do_bridge_resource_split(&(temp_resources.p_mem_head), 0x100000);

                        /* Check if we were able to split something off */
                        if (p_mem_node) {
                                /* First use the temporary node to store
                                 * information for the board */
                                hold_p_mem_node->length = p_mem_node->base - hold_p_mem_node->base;

                                /* If we used any, add it to the board's list */
                                if (hold_p_mem_node->length) {
                                        hold_p_mem_node->next = func->p_mem_head;
                                        func->p_mem_head = hold_p_mem_node;

                                        temp_word = (p_mem_node->base - 1) >> 16;
                                        rc = pci_bus_write_config_word (pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);

                                        return_resource(&(resources->p_mem_head), p_mem_node);
                                } else {
                                        /* it doesn't need any PMem */
                                        temp_word = 0x0000;
                                        rc = pci_bus_write_config_word (pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);

                                        return_resource(&(resources->p_mem_head), p_mem_node);
                                        kfree(hold_p_mem_node);
                                }
                        } else {
                                /* it used the most of the range */
                                hold_p_mem_node->next = func->p_mem_head;
                                func->p_mem_head = hold_p_mem_node;
                        }
                } else if (hold_p_mem_node) {
                        /* it used the whole range */
                        hold_p_mem_node->next = func->p_mem_head;
                        func->p_mem_head = hold_p_mem_node;
                }
                /* We should be configuring an IRQ and the bridge's base address
                 * registers if it needs them.  Although we have never seen such
                 * a device */

                /* enable card */
                command = 0x0157;       /* = PCI_COMMAND_IO |
                                         *   PCI_COMMAND_MEMORY |
                                         *   PCI_COMMAND_MASTER |
                                         *   PCI_COMMAND_INVALIDATE |
                                         *   PCI_COMMAND_PARITY |
                                         *   PCI_COMMAND_SERR */
                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_COMMAND, command);

                /* set Bridge Control Register */
                command = 0x07;         /* = PCI_BRIDGE_CTL_PARITY |
                                         *   PCI_BRIDGE_CTL_SERR |
                                         *   PCI_BRIDGE_CTL_NO_ISA */
                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_BRIDGE_CONTROL, command);
        } else if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
                /* Standard device */
                rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);

                if (class_code == PCI_BASE_CLASS_DISPLAY) {
                        /* Display (video) adapter (not supported) */
                        return DEVICE_TYPE_NOT_SUPPORTED;
                }
                /* Figure out IO and memory needs */
                for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
                        temp_register = 0xFFFFFFFF;

                        dbg("CND: bus=%d, devfn=%d, offset=%d\n", pci_bus->number, devfn, cloop);
                        rc = pci_bus_write_config_dword (pci_bus, devfn, cloop, temp_register);

                        rc = pci_bus_read_config_dword (pci_bus, devfn, cloop, &temp_register);
                        dbg("CND: base = 0x%x\n", temp_register);

                        if (temp_register) {      /* If this register is implemented */
                                if ((temp_register & 0x03L) == 0x01) {
                                        /* Map IO */

                                        /* set base = amount of IO space */
                                        base = temp_register & 0xFFFFFFFC;
                                        base = ~base + 1;

                                        dbg("CND:      length = 0x%x\n", base);
                                        io_node = get_io_resource(&(resources->io_head), base);
                                        dbg("Got io_node start = %8.8x, length = %8.8x next (%p)\n",
                                            io_node->base, io_node->length, io_node->next);
                                        dbg("func (%p) io_head (%p)\n", func, func->io_head);

                                        /* allocate the resource to the board */
                                        if (io_node) {
                                                base = io_node->base;

                                                io_node->next = func->io_head;
                                                func->io_head = io_node;
                                        } else
                                                return -ENOMEM;
                                } else if ((temp_register & 0x0BL) == 0x08) {
                                        /* Map prefetchable memory */
                                        base = temp_register & 0xFFFFFFF0;
                                        base = ~base + 1;

                                        dbg("CND:      length = 0x%x\n", base);
                                        p_mem_node = get_resource(&(resources->p_mem_head), base);

                                        /* allocate the resource to the board */
                                        if (p_mem_node) {
                                                base = p_mem_node->base;

                                                p_mem_node->next = func->p_mem_head;
                                                func->p_mem_head = p_mem_node;
                                        } else
                                                return -ENOMEM;
                                } else if ((temp_register & 0x0BL) == 0x00) {
                                        /* Map memory */
                                        base = temp_register & 0xFFFFFFF0;
                                        base = ~base + 1;

                                        dbg("CND:      length = 0x%x\n", base);
                                        mem_node = get_resource(&(resources->mem_head), base);

                                        /* allocate the resource to the board */
                                        if (mem_node) {
                                                base = mem_node->base;

                                                mem_node->next = func->mem_head;
                                                func->mem_head = mem_node;
                                        } else
                                                return -ENOMEM;
                                } else {
                                        /* Reserved bits or requesting space below 1M */
                                        return NOT_ENOUGH_RESOURCES;
                                }

                                rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);

                                /* Check for 64-bit base */
                                if ((temp_register & 0x07L) == 0x04) {
                                        cloop += 4;

                                        /* Upper 32 bits of address always zero
                                         * on today's systems */
                                        /* FIXME this is probably not true on
                                         * Alpha and ia64??? */
                                        base = 0;
                                        rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);
                                }
                        }
                }               /* End of base register loop */
                if (cpqhp_legacy_mode) {
                        /* Figure out which interrupt pin this function uses */
                        rc = pci_bus_read_config_byte (pci_bus, devfn,
                                PCI_INTERRUPT_PIN, &temp_byte);

                        /* If this function needs an interrupt and we are behind
                         * a bridge and the pin is tied to something that's
                         * alread mapped, set this one the same */
                        if (temp_byte && resources->irqs &&
                            (resources->irqs->valid_INT &
                             (0x01 << ((temp_byte + resources->irqs->barber_pole - 1) & 0x03)))) {
                                /* We have to share with something already set up */
                                IRQ = resources->irqs->interrupt[(temp_byte +
                                        resources->irqs->barber_pole - 1) & 0x03];
                        } else {
                                /* Program IRQ based on card type */
                                rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);

                                if (class_code == PCI_BASE_CLASS_STORAGE)
                                        IRQ = cpqhp_disk_irq;
                                else
                                        IRQ = cpqhp_nic_irq;
                        }

                        /* IRQ Line */
                        rc = pci_bus_write_config_byte (pci_bus, devfn, PCI_INTERRUPT_LINE, IRQ);
                }

                if (!behind_bridge) {
                        rc = cpqhp_set_irq(func->bus, func->device, temp_byte, IRQ);
                        if (rc)
                                return 1;
                } else {
                        /* TBD - this code may also belong in the other clause
                         * of this If statement */
                        resources->irqs->interrupt[(temp_byte + resources->irqs->barber_pole - 1) & 0x03] = IRQ;
                        resources->irqs->valid_INT |= 0x01 << (temp_byte + resources->irqs->barber_pole - 1) & 0x03;
                }

                /* Latency Timer */
                temp_byte = 0x40;
                rc = pci_bus_write_config_byte(pci_bus, devfn,
                                        PCI_LATENCY_TIMER, temp_byte);

                /* Cache Line size */
                temp_byte = 0x08;
                rc = pci_bus_write_config_byte(pci_bus, devfn,
                                        PCI_CACHE_LINE_SIZE, temp_byte);

                /* disable ROM base Address */
                temp_dword = 0x00L;
                rc = pci_bus_write_config_word(pci_bus, devfn,
                                        PCI_ROM_ADDRESS, temp_dword);

                /* enable card */
                temp_word = 0x0157;     /* = PCI_COMMAND_IO |
                                         *   PCI_COMMAND_MEMORY |
                                         *   PCI_COMMAND_MASTER |
                                         *   PCI_COMMAND_INVALIDATE |
                                         *   PCI_COMMAND_PARITY |
                                         *   PCI_COMMAND_SERR */
                rc = pci_bus_write_config_word (pci_bus, devfn,
                                        PCI_COMMAND, temp_word);
        } else {                /* End of Not-A-Bridge else */
                /* It's some strange type of PCI adapter (Cardbus?) */
                return DEVICE_TYPE_NOT_SUPPORTED;
        }

        func->configured = 1;

        return 0;
free_and_out:
        cpqhp_destroy_resource_list (&temp_resources);

        return_resource(&(resources-> bus_head), hold_bus_node);
        return_resource(&(resources-> io_head), hold_IO_node);
        return_resource(&(resources-> mem_head), hold_mem_node);
        return_resource(&(resources-> p_mem_head), hold_p_mem_node);
        return rc;
}