Linux-2.6.12-rc2

[mirror_ubuntu-artful-kernel.git] / drivers / pci / hotplug / shpchp_ctrl.c

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

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

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

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

u8 shpchp_disk_irq;
u8 shpchp_nic_irq;

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

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

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

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

        rc++;

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

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

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

        return 0;

}

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

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

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

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

        rc++;
        p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
        p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
        p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
        dbg("%s: Card present %x Power status %x\n", __FUNCTION__,
                func->presence_save, func->pwr_save);

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

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

        return rc;
}

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

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

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

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

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

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

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

        return rc;
}

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

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

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

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

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

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

        return rc;
}


/*
 * sort_by_size
 *
 * Sorts nodes on the list by their length.
 * Smallest first.
 *
 */
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
 *
 * Sorts nodes on the list by their length.
 * Largest first.
 *
 */
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
 *
 *      Returns zero or one node of resources that aren't in use
 *
 */
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 = shpchp_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;
                node->next = NULL;
        } else {
                prevnode = *head;
                while (prevnode->next != node)
                        prevnode = prevnode->next;

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

        return(node);
}


/*
 * do_bridge_resource_split
 *
 *      Returns zero or one node of resources that aren't in use
 *
 */
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;

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

        rc = shpchp_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) {
                kfree(node);
                return(NULL);
        }

        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) {
                        kfree(node);
                        return(NULL);
                }

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

        if (node->length & (alignment - 1)) {
                /* There's stuff in use after this node */
                kfree(node);
                return(NULL);
        }

        return(node);
}


/*
 * get_io_resource
 *
 * this function sorts the resource list by size and then
 * 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.
 *
 * size must be a power of two.
 */
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 = NULL;
        u32 temp_dword;

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

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

                        prevnode->next = node->next;
                }
                node->next = NULL;
                /* Stop looping */
                break;
        }

        return(node);
}


/*
 * get_max_resource
 *
 * 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.
 * J.I. modified to put max size limits of; 64M->32M->16M->8M->4M->1M
 *  This is needed to avoid allocating entire ACPI _CRS res to one child bridge/slot.
 */
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;
        u32 max_size[] = { 0x4000000, 0x2000000, 0x1000000, 0x0800000, 0x0400000, 0x0200000, 0x0100000, 0x00 };
        int i;

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

        if (shpchp_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;

                        /* Put it next in the list */
                        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;

                        /* Put it in the list */
                        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;

                for ( i = 0; max_size[i] > size; i++) {
                        if (max->length > max_size[i]) {
                                split_node = kmalloc(sizeof(*split_node),
                                                        GFP_KERNEL);
                                if (!split_node)
                                        break;  /* return (NULL); */
                                split_node->base = max->base + max_size[i];
                                split_node->length = max->length - max_size[i];
                                max->length = max_size[i];
                                /* Put it next in the list */
                                split_node->next = max->next;
                                max->next = split_node;
                                break;
                        }
                }

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

                        temp->next = max->next;
                }

                max->next = NULL;
                return(max);
        }

        /* If we get here, we couldn't find one */
        return(NULL);
}


/*
 * get_resource
 *
 * 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 (!(*head))
                return(NULL);

        if ( shpchp_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 =0x%x node=%p, base=0x%x, length=0x%x\n",
                    __FUNCTION__, size, node, node->base, node->length);
                if (node->length < size)
                        continue;

                if (node->base & (size - 1)) {
                        dbg("%s: not aligned\n", __FUNCTION__);
                        /* 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) {
                        dbg("%s: too big\n", __FUNCTION__);
                        /* 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", __FUNCTION__);
                /* 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;
                /* Stop looping */
                break;
        }
        return(node);
}


/*
 * shpchp_resource_sort_and_combine
 *
 * 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 shpchp_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", __FUNCTION__, 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);
}


/**
 * shpchp_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 *shpchp_slot_create(u8 busnumber)
{
        struct pci_func *new_slot;
        struct pci_func *next;

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

        if (new_slot == NULL) {
                return(new_slot);
        }

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

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

        if (shpchp_slot_list[busnumber] == NULL) {
                shpchp_slot_list[busnumber] = new_slot;
        } else {
                next = shpchp_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 = shpchp_slot_list[old_slot->bus];

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

        if (next == old_slot) {
                shpchp_slot_list[old_slot->bus] = old_slot->next;
                shpchp_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;
                shpchp_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;

        if (bridge == NULL)
                return(1);

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

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

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

        next = shpchp_slot_list[bridge->bus];

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

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

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

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


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

        func = shpchp_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);
}

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


/* The following routines constitute the bulk of the 
   hotplug controller logic
 */
static u32 change_bus_speed(struct controller *ctrl, struct slot *p_slot, enum pci_bus_speed speed)
{ 
        u32 rc = 0;

        dbg("%s: change to speed %d\n", __FUNCTION__, speed);
        down(&ctrl->crit_sect);
        if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
                err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
                up(&ctrl->crit_sect);
                return WRONG_BUS_FREQUENCY;
        }
        wait_for_ctrl_irq (ctrl);
                
        if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) {
                err("%s: Can't set bus speed/mode in the case of adapter & bus mismatch\n",
                          __FUNCTION__);
                err("%s: Error code (%d)\n", __FUNCTION__, rc);
                up(&ctrl->crit_sect);
                return WRONG_BUS_FREQUENCY;
        }
        up(&ctrl->crit_sect);
        return rc;
}

static u32 fix_bus_speed(struct controller *ctrl, struct slot *pslot, u8 flag, 
enum pci_bus_speed asp, enum pci_bus_speed bsp, enum pci_bus_speed msp)
{ 
        u32 rc = 0;
        
        if (flag != 0) { /* Other slots on the same bus are occupied */
                if ( asp < bsp ) {
                        err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bsp, asp);
                        return WRONG_BUS_FREQUENCY;
                }
        } else {
                /* Other slots on the same bus are empty */
                if (msp == bsp) {
                /* if adapter_speed >= bus_speed, do nothing */
                        if (asp < bsp) {
                                /* 
                                * Try to lower bus speed to accommodate the adapter if other slots 
                                * on the same controller are empty
                                */
                                if ((rc = change_bus_speed(ctrl, pslot, asp)))
                                        return rc;
                        } 
                } else {
                        if (asp < msp) {
                                if ((rc = change_bus_speed(ctrl, pslot, asp)))
                                        return rc;
                        } else {
                                if ((rc = change_bus_speed(ctrl, pslot, msp)))
                                        return rc;
                        }
                }
        }
        return rc;
}

/**
 * board_added - Called after a board has been added to the system.
 *
 * Turns power on for the board
 * Configures board
 *
 */
static u32 board_added(struct pci_func * func, struct controller * ctrl)
{
        u8 hp_slot;
        u8 slots_not_empty = 0;
        int index;
        u32 temp_register = 0xFFFFFFFF;
        u32 retval, rc = 0;
        struct pci_func *new_func = NULL;
        struct slot *p_slot;
        struct resource_lists res_lists;
        enum pci_bus_speed adapter_speed, bus_speed, max_bus_speed;
        u8 pi, mode;

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

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

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

        /* Power on slot without connecting to bus */
        rc = p_slot->hpc_ops->power_on_slot(p_slot);
        if (rc) {
                err("%s: Failed to power on slot\n", __FUNCTION__);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return -1;
        }
                        
        /* Wait for the command to complete */
        wait_for_ctrl_irq (ctrl);
        
        rc = p_slot->hpc_ops->check_cmd_status(ctrl);
        if (rc) {
                err("%s: Failed to power on slot, error code(%d)\n", __FUNCTION__, rc);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return -1;
        }

        
        if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
                if (slots_not_empty)
                        return WRONG_BUS_FREQUENCY;
                
                if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
                        err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
                        up(&ctrl->crit_sect);
                        return WRONG_BUS_FREQUENCY;
                }
                wait_for_ctrl_irq (ctrl);
                
                if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) {
                        err("%s: Can't set bus speed/mode in the case of adapter & bus mismatch\n",
                                  __FUNCTION__);
                        err("%s: Error code (%d)\n", __FUNCTION__, rc);
                        up(&ctrl->crit_sect);
                        return WRONG_BUS_FREQUENCY;
                }
                /* turn on board, blink green LED, turn off Amber LED */
                if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
                        err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
                        up(&ctrl->crit_sect);
                        return rc;
                }
                wait_for_ctrl_irq (ctrl);

                if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) {
                        err("%s: Failed to enable slot, error code(%d)\n", __FUNCTION__, rc);
                        up(&ctrl->crit_sect);
                        return rc;  
                }
        }
 
        rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &adapter_speed);
        /* 0 = PCI 33Mhz, 1 = PCI 66 Mhz, 2 = PCI-X 66 PA, 4 = PCI-X 66 ECC, */
        /* 5 = PCI-X 133 PA, 7 = PCI-X 133 ECC,  0xa = PCI-X 133 Mhz 266, */
        /* 0xd = PCI-X 133 Mhz 533 */
        /* This encoding is different from the one used in cur_bus_speed & */
        /* max_bus_speed */

        if (rc  || adapter_speed == PCI_SPEED_UNKNOWN) {
                err("%s: Can't get adapter speed or bus mode mismatch\n", __FUNCTION__);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return WRONG_BUS_FREQUENCY;
        }

        rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bus_speed);
        if (rc || bus_speed == PCI_SPEED_UNKNOWN) {
                err("%s: Can't get bus operation speed\n", __FUNCTION__);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return WRONG_BUS_FREQUENCY;
        }

        rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &max_bus_speed);
        if (rc || max_bus_speed == PCI_SPEED_UNKNOWN) {
                err("%s: Can't get max bus operation speed\n", __FUNCTION__);
                max_bus_speed = bus_speed;
        }

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

        if ((rc  = p_slot->hpc_ops->get_prog_int(p_slot, &pi))) {
                err("%s: Can't get controller programming interface, set it to 1\n", __FUNCTION__);
                pi = 1;
        }

        /* Check if there are other slots or devices on the same bus */
        if (!list_empty(&ctrl->pci_dev->subordinate->devices))
                slots_not_empty = 1;

        dbg("%s: slots_not_empty %d, pi %d\n", __FUNCTION__, 
                slots_not_empty, pi);
        dbg("adapter_speed %d, bus_speed %d, max_bus_speed %d\n", 
                adapter_speed, bus_speed, max_bus_speed);

        if (pi == 2) {
                dbg("%s: In PI = %d\n", __FUNCTION__, pi);
                if ((rc = p_slot->hpc_ops->get_mode1_ECC_cap(p_slot, &mode))) {
                        err("%s: Can't get Mode1_ECC, set mode to 0\n", __FUNCTION__);
                        mode = 0;
                }

                switch (adapter_speed) {
                case PCI_SPEED_133MHz_PCIX_533:
                case PCI_SPEED_133MHz_PCIX_266:
                        if ((bus_speed != adapter_speed) &&
                           ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed)))) 
                                return rc;
                        break;  
                case PCI_SPEED_133MHz_PCIX_ECC:
                case PCI_SPEED_133MHz_PCIX:
                        if (mode) { /* Bus - Mode 1 ECC */
                                if ((bus_speed != 0x7) &&
                                   ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed)))) 
                                        return rc;
                        } else {
                                if ((bus_speed != 0x4) &&
                                   ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed)))) 
                                        return rc;
                        }
                        break;
                case PCI_SPEED_66MHz_PCIX_ECC:
                case PCI_SPEED_66MHz_PCIX:
                        if (mode) { /* Bus - Mode 1 ECC */
                                if ((bus_speed != 0x5) &&
                                   ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed)))) 
                                        return rc;
                        } else {
                                if ((bus_speed != 0x2) &&
                                   ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed)))) 
                                        return rc;
                        }
                        break;
                case PCI_SPEED_66MHz:
                        if ((bus_speed != 0x1) &&
                           ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed)))) 
                                return rc;
                        break;  
                case PCI_SPEED_33MHz:
                        if (bus_speed > 0x0) {
                                if (slots_not_empty == 0) {
                                        if ((rc = change_bus_speed(ctrl, p_slot, adapter_speed)))
                                                return rc;
                                } else {
                                        err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bus_speed, adapter_speed);
                                        return WRONG_BUS_FREQUENCY;
                                }
                        }
                        break;
                default:
                        err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bus_speed, adapter_speed);
                        return WRONG_BUS_FREQUENCY;
                }
        } else {
                /* If adpater_speed == bus_speed, nothing to do here */
                dbg("%s: In PI = %d\n", __FUNCTION__, pi);
                if ((adapter_speed != bus_speed) &&
                   ((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
                                return rc;
        }

        down(&ctrl->crit_sect);
        /* turn on board, blink green LED, turn off Amber LED */
        if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
                err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
                up(&ctrl->crit_sect);
                return rc;
        }
        wait_for_ctrl_irq (ctrl);

        if ((rc = p_slot->hpc_ops->check_cmd_status(ctrl))) {
                err("%s: Failed to enable slot, error code(%d)\n", __FUNCTION__, rc);
                up(&ctrl->crit_sect);
                return rc;  
        }

        up(&ctrl->crit_sect);

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

        dbg("%s: func status = %x\n", __FUNCTION__, func->status);
        /* Check for a power fault */
        if (func->status == 0xFF) {
                /* power fault occurred, but it was benign */
                temp_register = 0xFFFFFFFF;
                dbg("%s: temp register set to %x by power fault\n", __FUNCTION__, temp_register);
                rc = POWER_FAILURE;
                func->status = 0;
        } else {
                /* Get vendor/device ID u32 */
                rc = pci_bus_read_config_dword (ctrl->pci_dev->subordinate, PCI_DEVFN(func->device, func->function), 
                        PCI_VENDOR_ID, &temp_register);
                dbg("%s: pci_bus_read_config_dword returns %d\n", __FUNCTION__, rc);
                dbg("%s: temp_register is %x\n", __FUNCTION__, temp_register);

                if (rc != 0) {
                        /* Something's wrong here */
                        temp_register = 0xFFFFFFFF;
                        dbg("%s: temp register set to %x by error\n", __FUNCTION__, 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) {        /* Check for a board in the slot */
                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, 0, 0);
                dbg("%s: back from configure_new_device\n", __FUNCTION__);

                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;

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

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

                        /* turn off slot, turn on Amber LED, turn off Green LED */
                        retval = p_slot->hpc_ops->slot_disable(p_slot);
                        if (retval) {
                                err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
                                /* Done with exclusive hardware access */
                                up(&ctrl->crit_sect);
                                return retval;
                        }
                        /* Wait for the command to complete */
                        wait_for_ctrl_irq (ctrl);

                        retval = p_slot->hpc_ops->check_cmd_status(ctrl);
                        if (retval) {
                                err("%s: Failed to disable slot, error code(%d)\n", __FUNCTION__, retval);
                                /* Done with exclusive hardware access */
                                up(&ctrl->crit_sect);
                                return retval;  
                        }

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

                        return(rc);
                }
                shpchp_save_slot_config(ctrl, func);

                func->status = 0;
                func->switch_save = 0x10;
                func->is_a_board = 0x01;
                func->pwr_save = 1;

                /* Next, we will instantiate the linux pci_dev structures 
                 * (with appropriate driver notification, if already present) 
                 */
                index = 0;
                do {
                        new_func = shpchp_slot_find(ctrl->slot_bus, func->device, index++);
                        if (new_func && !new_func->pci_dev) {
                                dbg("%s:call pci_hp_configure_dev\n", __FUNCTION__);
                                shpchp_configure_device(ctrl, new_func);
                        }
                } while (new_func);

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

                p_slot->hpc_ops->green_led_on(p_slot);

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


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

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

                /* turn off slot, turn on Amber LED, turn off Green LED */
                rc = p_slot->hpc_ops->slot_disable(p_slot);
                if (rc) {
                        err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
                        /* Done with exclusive hardware access */
                        up(&ctrl->crit_sect);
                        return rc;
                }
                /* Wait for the command to complete */
                wait_for_ctrl_irq (ctrl);

                rc = p_slot->hpc_ops->check_cmd_status(ctrl);
                if (rc) {
                        err("%s: Failed to disable slot, error code(%d)\n", __FUNCTION__, rc);
                        /* Done with exclusive hardware access */
                        up(&ctrl->crit_sect);
                        return rc;  
                }

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

                return(rc);
        }
        return 0;
}


/**
 * remove_board - Turns off slot and LED's
 *
 */
static u32 remove_board(struct pci_func *func, struct controller *ctrl)
{
        int index;
        u8 skip = 0;
        u8 device;
        u8 hp_slot;
        u32 rc;
        struct resource_lists res_lists;
        struct pci_func *temp_func;
        struct slot *p_slot;

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

        if (shpchp_unconfigure_device(func))
                return(1);

        device = func->device;

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

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

        if ((ctrl->add_support) &&
                !(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 = func;

                while ((temp_func = shpchp_slot_find(temp_func->bus, temp_func->device, index++))) {
                        if (temp_func->bus_head || temp_func->mem_head
                            || temp_func->p_mem_head || temp_func->io_head) {
                                skip = 1;
                                break;
                        }
                }

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

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

        /* turn off slot, turn on Amber LED, turn off Green LED */
        rc = p_slot->hpc_ops->slot_disable(p_slot);
        if (rc) {
                err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return rc;
        }
        /* Wait for the command to complete */
        wait_for_ctrl_irq (ctrl);

        rc = p_slot->hpc_ops->check_cmd_status(ctrl);
        if (rc) {
                err("%s: Failed to disable slot, error code(%d)\n", __FUNCTION__, rc);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return rc;  
        }
        
        rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
        if (rc) {
                err("%s: Issue of Set Attention command failed\n", __FUNCTION__);
                /* Done with exclusive hardware access */
                up(&ctrl->crit_sect);
                return rc;
        }
        /* Wait for the command to complete */
        wait_for_ctrl_irq (ctrl);

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

        if (ctrl->add_support) {
                while (func) {
                        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;

                        dbg("Returning resources to ctlr lists for (B/D/F) = (%#x/%#x/%#x)\n", func->bus, 
                                func->device, func->function);

                        shpchp_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;

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

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

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

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

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

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

        return 0;
}


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

        up(&event_semaphore);
}


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

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

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

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

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

                        p_slot->hpc_ops->green_led_off(p_slot);

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

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

        return;
}


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

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

int shpchp_event_start_thread (void)
{
        int pid;

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

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

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


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


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

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

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

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

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

        dbg("%s:\n", __FUNCTION__);
        while (change) {
                change = 0;

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

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

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

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

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

                                        switch (p_slot->state) {
                                        case BLINKINGOFF_STATE:
                                                /* Wait for exclusive access to hardware */
                                                down(&ctrl->crit_sect);

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

                                                p_slot->hpc_ops->set_attention_status(p_slot, 0);

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

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

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

                                                p_slot->hpc_ops->set_attention_status(p_slot, 0);
                                                /* Wait for the command to complete */
                                                wait_for_ctrl_irq (ctrl);

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

                                                break;
                                        default:
                                                warn("Not a valid state\n");
                                                return;
                                        }
                                        info(msg_button_cancel, p_slot->number);
                                        p_slot->state = STATIC_STATE;
                                } else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
                                        /* Button Pressed (No action on 1st press...) */
                                        dbg("%s: Button pressed\n", __FUNCTION__);

                                        p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
                                        if (getstatus) {
                                                /* slot is on */
                                                dbg("%s: slot is on\n", __FUNCTION__);
                                                p_slot->state = BLINKINGOFF_STATE;
                                                info(msg_button_off, p_slot->number);
                                        } else {
                                                /* slot is off */
                                                dbg("%s: slot is off\n", __FUNCTION__);
                                                p_slot->state = BLINKINGON_STATE;
                                                info(msg_button_on, p_slot->number);
                                        }

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

                                        /* blink green LED and turn off amber */
                                        p_slot->hpc_ops->green_led_blink(p_slot);
                                        /* Wait for the command to complete */
                                        wait_for_ctrl_irq (ctrl);
                                        
                                        p_slot->hpc_ops->set_attention_status(p_slot, 0);

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

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

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

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

                                        p_slot->hpc_ops->set_attention_status(p_slot, 1);
                                        /* Wait for the command to complete */
                                        wait_for_ctrl_irq (ctrl);
                                        
                                        p_slot->hpc_ops->green_led_off(p_slot);
                                        /* Wait for the command to complete */
                                        wait_for_ctrl_irq (ctrl);

                                        /* Done with exclusive hardware access */
                                        up(&ctrl->crit_sect);
                                } else {
                                        /* refresh notification */
                                        if (p_slot)
                                                update_slot_info(p_slot);
                                }

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

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

        return;
}


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

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

        /* Check to see if (latch closed, card present, power off) */
        down(&p_slot->ctrl->crit_sect);
        rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
        if (rc || !getstatus) {
                info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
                up(&p_slot->ctrl->crit_sect);
                return 1;
        }
        rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
        if (rc || getstatus) {
                info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
                up(&p_slot->ctrl->crit_sect);
                return 1;
        }
        rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
        if (rc || getstatus) {
                info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
                up(&p_slot->ctrl->crit_sect);
                return 1;
        }
        up(&p_slot->ctrl->crit_sect);

        slot_remove(func);

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

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

        /* We have to save the presence info for these slots */
        p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
        p_slot->hpc_ops->get_power_status(p_slot, &(func->pwr_save));
        dbg("%s: func->pwr_save %x\n", __FUNCTION__, func->pwr_save);
        p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
        func->switch_save = !getstatus? 0x10:0;

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

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

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

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

        if (p_slot)
                update_slot_info(p_slot);

        return rc;
}


int shpchp_disable_slot (struct slot *p_slot)
{
        u8 class_code, header_type, BCR;
        u8 index = 0;
        u8 getstatus = 0;
        u32 rc = 0;
        int ret = 0;
        unsigned int devfn;
        struct pci_bus *pci_bus;
        struct pci_func *func;

        if (!p_slot->ctrl)
                return 1;

        pci_bus = p_slot->ctrl->pci_dev->subordinate;

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

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

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

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

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

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

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

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

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

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

        if (p_slot)
                update_slot_info(p_slot);

        return(rc);
}


/**
 * 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 bridge_bus, u8 bridge_dev)
{
        u8 temp_byte, function, max_functions, stop_it;
        int rc;
        u32 ID;
        struct pci_func *new_slot;
        struct pci_bus lpci_bus, *pci_bus;
        int index;

        new_slot = func;

        dbg("%s\n", __FUNCTION__);
        memcpy(&lpci_bus, ctrl->pci_dev->subordinate, sizeof(lpci_bus));
        pci_bus = &lpci_bus;
        pci_bus->number = func->bus;

        /* Check for Multi-function device */
        rc = pci_bus_read_config_byte(pci_bus, PCI_DEVFN(func->device, func->function), 0x0E, &temp_byte);
        if (rc) {
                dbg("%s: rc = %d\n", __FUNCTION__, 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, bridge_bus, bridge_dev);

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

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

                                if (new_slot)
                                        shpchp_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(pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID);

                        if (ID == 0xFFFFFFFF) {   /* There's nothing there. */
                                function++;
                        } else {  /* There's something there */
                                /* Setup slot structure. */
                                new_slot = shpchp_slot_create(func->bus);

                                if (new_slot == NULL) {
                                        /* Out of memory */
                                        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, u8 bridge_bus, u8 bridge_dev)
{
        int cloop;
        u8 temp_byte;
        u8 device;
        u8 class_code;
        u16 temp_word;
        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 lpci_bus, *pci_bus;
        struct resource_lists temp_resources;
#if defined(CONFIG_X86_64)
        u8 IRQ=0;
#endif

        memcpy(&lpci_bus, ctrl->pci_dev->subordinate, sizeof(lpci_bus));
        pci_bus = &lpci_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) { /* PCI-PCI Bridge */
                /* set Primary bus */
                dbg("set Primary bus = 0x%x\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 */
                bus_node = get_max_resource(&resources->bus_head, 1L);

                /* If we don't have any busses to allocate, we can't continue */
                if (!bus_node) {
                        err("Got NO bus resource to use\n");
                        return -ENOMEM;
                }
                dbg("Got ranges of buses to use: base:len=0x%x:%x\n", bus_node->base, bus_node->length);

                /* set Secondary bus */
                temp_byte = (u8)bus_node->base;
                dbg("set Secondary bus = 0x%x\n", temp_byte);
                rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SECONDARY_BUS, temp_byte);
                if (rc)
                        return rc;

                /* set subordinate bus */
                temp_byte = (u8)(bus_node->base + bus_node->length - 1);
                dbg("set subordinate bus = 0x%x\n", temp_byte);
                rc = pci_bus_write_config_byte (pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
                if (rc)
                        return rc;

                /* Set HP parameters (Cache Line Size, Latency Timer) */
                rc = shpchprm_set_hpp(ctrl, func, PCI_HEADER_TYPE_BRIDGE);
                if (rc)
                        return rc;

                /* Setup the IO, memory, and prefetchable windows */

                io_node = get_max_resource(&(resources->io_head), 0x1000L);
                if (io_node) {
                        dbg("io_node(base, len, next) (%x, %x, %p)\n", io_node->base, io_node->length, io_node->next);
                }

                mem_node = get_max_resource(&(resources->mem_head), 0x100000L);
                if (mem_node) {
                        dbg("mem_node(base, len, next) (%x, %x, %p)\n", mem_node->base, mem_node->length, mem_node->next);
                }

                if (resources->p_mem_head)
                        p_mem_node = get_max_resource(&(resources->p_mem_head), 0x100000L);
                else {
                        /*
                         * In some platform implementation, MEM and PMEM are not
                         *  distinguished, and hence ACPI _CRS has only MEM entries
                         *  for both MEM and PMEM.
                         */
                        dbg("using MEM for PMEM\n");
                        p_mem_node = get_max_resource(&(resources->mem_head), 0x100000L);
                }
                if (p_mem_node) {
                        dbg("p_mem_node(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 */
                        RES_CHECK(io_node->base, 8);
                        temp_byte = (u8)(io_node->base >> 8);
                        rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_BASE, temp_byte);

                        RES_CHECK(io_node->base + io_node->length - 1, 8);
                        temp_byte = (u8)((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 */
                        RES_CHECK(mem_node->base, 16);
                        temp_word = (u32)(mem_node->base >> 16);
                        rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);

                        RES_CHECK(mem_node->base + mem_node->length - 1, 16);
                        temp_word = (u32)((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;
                }

                /* If we have prefetchable 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 (p_mem_node) {
                        memcpy(hold_p_mem_node, p_mem_node, sizeof(struct pci_resource));
                        p_mem_node->next = NULL;

                        /* set Pre Mem base and Limit registers */
                        RES_CHECK(p_mem_node->base, 16);
                        temp_word = (u32)(p_mem_node->base >> 16);
                        rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);

                        RES_CHECK(p_mem_node->base + p_mem_node->length - 1, 16);
                        temp_word = (u32)((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);
                } else {
                        temp_word = 0xFFFF;
                        rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);

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

                        kfree(hold_p_mem_node);
                        hold_p_mem_node = NULL;
                }

                /* 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),
                                        PCI_VENDOR_ID, &ID);
                        pci_bus->number = func->bus;

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

                                if (new_slot == NULL) {
                                        /* Out of memory */
                                        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, func->bus, func->device);
                                dbg("configure_new_device rc=0x%x\n",rc);
                        }       /* End of IF (device in slot?) */
                }               /* End of FOR loop */

                if (rc) {
                        shpchp_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);
                }

                /* 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 = shpchp_set_irq(func->bus, func->device,
                                                           0x0A + cloop, irqs.interrupt[cloop]);
                                        if (rc) {
                                                shpchp_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;
                                        }
                                }
                        }       /* 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 = (u8)(temp_resources.bus_head->base - 1);

                        /* set subordinate bus */
                        dbg("re-set subordinate bus = 0x%x\n", temp_byte);
                        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 {
                                dbg("return bus res of b:d(0x%x:%x) base:len(0x%x:%x)\n",
                                        func->bus, func->device, temp_resources.bus_head->base, temp_resources.bus_head->length);
                                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;

                                RES_CHECK(hold_IO_node->base, 8);
                                temp_byte = (u8)((hold_IO_node->base) >> 8);
                                rc = pci_bus_write_config_byte (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;

                                        RES_CHECK(io_node->base - 1, 8);
                                        temp_byte = (u8)((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_byte = 0x00;
                                        rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);

                                        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, 0x100000L);

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

                                RES_CHECK(hold_mem_node->base, 16);
                                temp_word = (u32)((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), 0x100000L);

                        /* 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 */
                                        RES_CHECK(mem_node->base - 1, 16);
                                        temp_word = (u32)((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, 0x100000L);

                        /* 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;

                                RES_CHECK(hold_p_mem_node->base, 16);
                                temp_word = (u32)((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), 0x100000L);

                        /* 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;

                                        RES_CHECK(p_mem_node->base - 1, 16);
                                        temp_word = (u32)((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
                 */

                shpchprm_enable_card(ctrl, func, PCI_HEADER_TYPE_BRIDGE);

                dbg("PCI Bridge Hot-Added s:b:d:f(%02x:%02x:%02x:%02x)\n", ctrl->seg, func->bus, func->device, func->function);
        } else if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
                /* Standard device */
                u64     base64;
                rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);

                if (class_code == PCI_BASE_CLASS_DISPLAY)
                        return (DEVICE_TYPE_NOT_SUPPORTED);

                /* Figure out IO and memory needs */
                for (cloop = PCI_BASE_ADDRESS_0; cloop <= PCI_BASE_ADDRESS_5; cloop += 4) {
                        temp_register = 0xFFFFFFFF;

                        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("Bar[%x]=0x%x on bus:dev:func(0x%x:%x:%x)\n", cloop, temp_register, func->bus, func->device, 
                                func->function);

                        if (!temp_register)
                                continue;

                        base64 = 0L;
                        if (temp_register & PCI_BASE_ADDRESS_SPACE_IO) {
                                /* Map IO */

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

                                dbg("NEED IO length(0x%x)\n", base);
                                io_node = get_io_resource(&(resources->io_head),(ulong)base);

                                /* allocate the resource to the board */
                                if (io_node) {
                                        dbg("Got IO base=0x%x(length=0x%x)\n", io_node->base, io_node->length);
                                        base = (u32)io_node->base;
                                        io_node->next = func->io_head;
                                        func->io_head = io_node;
                                } else {
                                        err("Got NO IO resource(length=0x%x)\n", base);
                                        return -ENOMEM;
                                }
                        } else {        /* map MEM */
                                int prefetchable = 1;
                                struct pci_resource **res_node = &func->p_mem_head;
                                char *res_type_str = "PMEM";
                                u32     temp_register2;

                                if (!(temp_register & PCI_BASE_ADDRESS_MEM_PREFETCH)) {
                                        prefetchable = 0;
                                        res_node = &func->mem_head;
                                        res_type_str++;
                                }

                                base = temp_register & 0xFFFFFFF0;
                                base = ~base + 1;

                                switch (temp_register & PCI_BASE_ADDRESS_MEM_TYPE_MASK) {
                                case PCI_BASE_ADDRESS_MEM_TYPE_32:
                                        dbg("NEED 32 %s bar=0x%x(length=0x%x)\n", res_type_str, temp_register, base);

                                        if (prefetchable && resources->p_mem_head)
                                                mem_node=get_resource(&(resources->p_mem_head), (ulong)base);
                                        else {
                                                if (prefetchable)
                                                        dbg("using MEM for PMEM\n");
                                                mem_node=get_resource(&(resources->mem_head), (ulong)base);
                                        }

                                        /* allocate the resource to the board */
                                        if (mem_node) {
                                                base = (u32)mem_node->base; 
                                                mem_node->next = *res_node;
                                                *res_node = mem_node;
                                                dbg("Got 32 %s base=0x%x(length=0x%x)\n", res_type_str, mem_node->base, 
                                                        mem_node->length);
                                        } else {
                                                err("Got NO 32 %s resource(length=0x%x)\n", res_type_str, base);
                                                return -ENOMEM;
                                        }
                                        break;
                                case PCI_BASE_ADDRESS_MEM_TYPE_64:
                                        rc = pci_bus_read_config_dword(pci_bus, devfn, cloop+4, &temp_register2);
                                        dbg("NEED 64 %s bar=0x%x:%x(length=0x%x)\n", res_type_str, temp_register2, 
                                                temp_register, base);

                                        if (prefetchable && resources->p_mem_head)
                                                mem_node = get_resource(&(resources->p_mem_head), (ulong)base);
                                        else {
                                                if (prefetchable)
                                                        dbg("using MEM for PMEM\n");
                                                mem_node = get_resource(&(resources->mem_head), (ulong)base);
                                        }

                                        /* allocate the resource to the board */
                                        if (mem_node) {
                                                base64 = mem_node->base; 
                                                mem_node->next = *res_node;
                                                *res_node = mem_node;
                                                dbg("Got 64 %s base=0x%x:%x(length=%x)\n", res_type_str, (u32)(base64 >> 32), 
                                                        (u32)base64, mem_node->length);
                                        } else {
                                                err("Got NO 64 %s resource(length=0x%x)\n", res_type_str, base);
                                                return -ENOMEM;
                                        }
                                        break;
                                default:
                                        dbg("reserved BAR type=0x%x\n", temp_register);
                                        break;
                                }

                        }

                        if (base64) {
                                rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, (u32)base64);
                                cloop += 4;
                                base64 >>= 32;

                                if (base64) {
                                        dbg("%s: high dword of base64(0x%x) set to 0\n", __FUNCTION__, (u32)base64);
                                        base64 = 0x0L;
                                }

                                rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, (u32)base64);
                        } else {
                                rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);
                        }
                }               /* End of base register loop */

#if defined(CONFIG_X86_64)
                /* 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 = shpchp_disk_irq;
                        } else {
                                IRQ = shpchp_nic_irq;
                        }
                }

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

                if (!behind_bridge) {
                        rc = shpchp_set_irq(func->bus, func->device, temp_byte + 0x09, 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;
                }
#endif
                /* Disable ROM base Address */
                temp_word = 0x00L;
                rc = pci_bus_write_config_word (pci_bus, devfn, PCI_ROM_ADDRESS, temp_word);

                /* Set HP parameters (Cache Line Size, Latency Timer) */
                rc = shpchprm_set_hpp(ctrl, func, PCI_HEADER_TYPE_NORMAL);
                if (rc)
                        return rc;

                shpchprm_enable_card(ctrl, func, PCI_HEADER_TYPE_NORMAL);

                dbg("PCI function Hot-Added s:b:d:f(%02x:%02x:%02x:%02x)\n", ctrl->seg, func->bus, func->device, func->function);
        }                       /* End of Not-A-Bridge else */
        else {
                /* It's some strange type of PCI adapter (Cardbus?) */
                return(DEVICE_TYPE_NOT_SUPPORTED);
        }

        func->configured = 1;

        return 0;
}