cpqphp_ctrl.c

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/*
 * Compaq Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
 * 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 <[email protected]>
 *
 */

#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;
}

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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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;
}


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
 */


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;

}


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;
}


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 */
                    if (p_slot)
                        update_slot_info(ctrl, p_slot);
                }

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

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

    return;
}


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;
}

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);
    }
}

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;
}


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
 */


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 */
        if (io_node) {
            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);
        } else {
            kfree(hold_IO_node);
            hold_IO_node = NULL;
        }

        /* If we have memory resources copy them and fill in the
         * bridge's memory range registers.  Otherwise, fill in the
         * range registers with values that disable them. */
        if (mem_node) {
            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);
        } else {
            temp_word = 0xFFFF;
            rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);

            temp_word = 0x0000;
            rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);

            kfree(hold_mem_node);
            hold_mem_node = NULL;
        }

        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 (hold_bus_node && 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 (hold_p_mem_node && 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;
}