OSCL-LXR linux-6.0.1/​drivers/​pci/​hotplug/​cpqphp_ctrl.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Compaq Hot Plug Controller Driver
  *
  * Copyright (C) 1995,2001 Compaq Computer Corporation
  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
  * Copyright (C) 2001 IBM Corp.
  *
  * All rights reserved.
  *
  * Send feedback to <greg@kroah.com>
  *
  */
 
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/wait.h>
 #include <linux/pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/kthread.h>
 #include "cpqphp.h"
 
 static u32 configure_new_device(struct controller *ctrl, struct pci_func *func,
             u8 behind_bridge, struct resource_lists *resources);
 static int configure_new_function(struct controller *ctrl, struct pci_func *func,
             u8 behind_bridge, struct resource_lists *resources);
 static void interrupt_event_handler(struct controller *ctrl);
 
 
 static struct task_struct *cpqhp_event_thread;
 static struct timer_list *pushbutton_pending;   /* = NULL */
 
 /* delay is in jiffies to wait for */
 static void long_delay(int delay)
 {
     /*
      * XXX(hch): if someone is bored please convert all callers
      * to call msleep_interruptible directly.  They really want
      * to specify timeouts in natural units and spend a lot of
      * effort converting them to jiffies..
      */
     msleep_interruptible(jiffies_to_msecs(delay));
 }
 
 
 /* FIXME: The following line needs to be somewhere else... */
 #define WRONG_BUS_FREQUENCY 0x07
 static u8 handle_switch_change(u8 change, struct controller *ctrl)
 {
     int hp_slot;
     u8 rc = 0;
     u16 temp_word;
     struct pci_func *func;
     struct event_info *taskInfo;
 
     if (!change)
         return 0;
 
     /* Switch Change */
     dbg("cpqsbd:  Switch interrupt received.\n");
 
     for (hp_slot = 0; hp_slot < 6; hp_slot++) {
         if (change & (0x1L << hp_slot)) {
             /*
              * this one changed.
              */
             func = cpqhp_slot_find(ctrl->bus,
                 (hp_slot + ctrl->slot_device_offset), 0);
 
             /* this is the structure that tells the worker thread
              * what to do
              */
             taskInfo = &(ctrl->event_queue[ctrl->next_event]);
             ctrl->next_event = (ctrl->next_event + 1) % 10;
             taskInfo->hp_slot = hp_slot;
 
             rc++;
 
             temp_word = ctrl->ctrl_int_comp >> 16;
             func->presence_save = (temp_word >> hp_slot) & 0x01;
             func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
 
             if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
                 /*
                  * Switch opened
                  */
 
                 func->switch_save = 0;
 
                 taskInfo->event_type = INT_SWITCH_OPEN;
             } else {
                 /*
                  * Switch closed
                  */
 
                 func->switch_save = 0x10;
 
                 taskInfo->event_type = INT_SWITCH_CLOSE;
             }
         }
     }
 
     return rc;
 }
 
 /**
  * cpqhp_find_slot - find the struct slot of given device
  * @ctrl: scan lots of this controller
  * @device: the device id to find
  */
 static struct slot *cpqhp_find_slot(struct controller *ctrl, u8 device)
 {
     struct slot *slot = ctrl->slot;
 
     while (slot && (slot->device != device))
         slot = slot->next;
 
     return slot;
 }
 
 
 static u8 handle_presence_change(u16 change, struct controller *ctrl)
 {
     int hp_slot;
     u8 rc = 0;
     u8 temp_byte;
     u16 temp_word;
     struct pci_func *func;
     struct event_info *taskInfo;
     struct slot *p_slot;
 
     if (!change)
         return 0;
 
     /*
      * Presence Change
      */
     dbg("cpqsbd:  Presence/Notify input change.\n");
     dbg("         Changed bits are 0x%4.4x\n", change);
 
     for (hp_slot = 0; hp_slot < 6; hp_slot++) {
         if (change & (0x0101 << hp_slot)) {
             /*
              * this one changed.
              */
             func = cpqhp_slot_find(ctrl->bus,
                 (hp_slot + ctrl->slot_device_offset), 0);
 
             taskInfo = &(ctrl->event_queue[ctrl->next_event]);
             ctrl->next_event = (ctrl->next_event + 1) % 10;
             taskInfo->hp_slot = hp_slot;
 
             rc++;
 
             p_slot = cpqhp_find_slot(ctrl, hp_slot + (readb(ctrl->hpc_reg + SLOT_MASK) >> 4));
             if (!p_slot)
                 return 0;
 
             /* If the switch closed, must be a button
              * If not in button mode, nevermind
              */
             if (func->switch_save && (ctrl->push_button == 1)) {
                 temp_word = ctrl->ctrl_int_comp >> 16;
                 temp_byte = (temp_word >> hp_slot) & 0x01;
                 temp_byte |= (temp_word >> (hp_slot + 7)) & 0x02;
 
                 if (temp_byte != func->presence_save) {
                     /*
                      * button Pressed (doesn't do anything)
                      */
                     dbg("hp_slot %d button pressed\n", hp_slot);
                     taskInfo->event_type = INT_BUTTON_PRESS;
                 } else {
                     /*
                      * button Released - TAKE ACTION!!!!
                      */
                     dbg("hp_slot %d button released\n", hp_slot);
                     taskInfo->event_type = INT_BUTTON_RELEASE;
 
                     /* Cancel if we are still blinking */
                     if ((p_slot->state == BLINKINGON_STATE)
                         || (p_slot->state == BLINKINGOFF_STATE)) {
                         taskInfo->event_type = INT_BUTTON_CANCEL;
                         dbg("hp_slot %d button cancel\n", hp_slot);
                     } else if ((p_slot->state == POWERON_STATE)
                            || (p_slot->state == POWEROFF_STATE)) {
                         /* info(msg_button_ignore, p_slot->number); */
                         taskInfo->event_type = INT_BUTTON_IGNORE;
                         dbg("hp_slot %d button ignore\n", hp_slot);
                     }
                 }
             } else {
                 /* Switch is open, assume a presence change
                  * Save the presence state
                  */
                 temp_word = ctrl->ctrl_int_comp >> 16;
                 func->presence_save = (temp_word >> hp_slot) & 0x01;
                 func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
 
                 if ((!(ctrl->ctrl_int_comp & (0x010000 << hp_slot))) ||
                     (!(ctrl->ctrl_int_comp & (0x01000000 << hp_slot)))) {
                     /* Present */
                     taskInfo->event_type = INT_PRESENCE_ON;
                 } else {
                     /* Not Present */
                     taskInfo->event_type = INT_PRESENCE_OFF;
                 }
             }
         }
     }
 
     return rc;
 }
 
 
 static u8 handle_power_fault(u8 change, struct controller *ctrl)
 {
     int hp_slot;
     u8 rc = 0;
     struct pci_func *func;
     struct event_info *taskInfo;
 
     if (!change)
         return 0;
 
     /*
      * power fault
      */
 
     info("power fault interrupt\n");
 
     for (hp_slot = 0; hp_slot < 6; hp_slot++) {
         if (change & (0x01 << hp_slot)) {
             /*
              * this one changed.
              */
             func = cpqhp_slot_find(ctrl->bus,
                 (hp_slot + ctrl->slot_device_offset), 0);
 
             taskInfo = &(ctrl->event_queue[ctrl->next_event]);
             ctrl->next_event = (ctrl->next_event + 1) % 10;
             taskInfo->hp_slot = hp_slot;
 
             rc++;
 
             if (ctrl->ctrl_int_comp & (0x00000100 << hp_slot)) {
                 /*
                  * power fault Cleared
                  */
                 func->status = 0x00;
 
                 taskInfo->event_type = INT_POWER_FAULT_CLEAR;
             } else {
                 /*
                  * power fault
                  */
                 taskInfo->event_type = INT_POWER_FAULT;
 
                 if (ctrl->rev < 4) {
                     amber_LED_on(ctrl, hp_slot);
                     green_LED_off(ctrl, hp_slot);
                     set_SOGO(ctrl);
 
                     /* this is a fatal condition, we want
                      * to crash the machine to protect from
                      * data corruption. simulated_NMI
                      * shouldn't ever return */
                     /* FIXME
                     simulated_NMI(hp_slot, ctrl); */
 
                     /* The following code causes a software
                      * crash just in case simulated_NMI did
                      * return */
                     /*FIXME
                     panic(msg_power_fault); */
                 } else {
                     /* set power fault status for this board */
                     func->status = 0xFF;
                     info("power fault bit %x set\n", hp_slot);
                 }
             }
         }
     }
 
     return rc;
 }
 
 
 /**
  * sort_by_size - sort nodes on the list by their length, smallest first.
  * @head: list to sort
  */
 static int sort_by_size(struct pci_resource **head)
 {
     struct pci_resource *current_res;
     struct pci_resource *next_res;
     int out_of_order = 1;
 
     if (!(*head))
         return 1;
 
     if (!((*head)->next))
         return 0;
 
     while (out_of_order) {
         out_of_order = 0;
 
         /* Special case for swapping list head */
         if (((*head)->next) &&
             ((*head)->length > (*head)->next->length)) {
             out_of_order++;
             current_res = *head;
             *head = (*head)->next;
             current_res->next = (*head)->next;
             (*head)->next = current_res;
         }
 
         current_res = *head;
 
         while (current_res->next && current_res->next->next) {
             if (current_res->next->length > current_res->next->next->length) {
                 out_of_order++;
                 next_res = current_res->next;
                 current_res->next = current_res->next->next;
                 current_res = current_res->next;
                 next_res->next = current_res->next;
                 current_res->next = next_res;
             } else
                 current_res = current_res->next;
         }
     }  /* End of out_of_order loop */
 
     return 0;
 }
 
 
 /**
  * sort_by_max_size - sort nodes on the list by their length, largest first.
  * @head: list to sort
  */
 static int sort_by_max_size(struct pci_resource **head)
 {
     struct pci_resource *current_res;
     struct pci_resource *next_res;
     int out_of_order = 1;
 
     if (!(*head))
         return 1;
 
     if (!((*head)->next))
         return 0;
 
     while (out_of_order) {
         out_of_order = 0;
 
         /* Special case for swapping list head */
         if (((*head)->next) &&
             ((*head)->length < (*head)->next->length)) {
             out_of_order++;
             current_res = *head;
             *head = (*head)->next;
             current_res->next = (*head)->next;
             (*head)->next = current_res;
         }
 
         current_res = *head;
 
         while (current_res->next && current_res->next->next) {
             if (current_res->next->length < current_res->next->next->length) {
                 out_of_order++;
                 next_res = current_res->next;
                 current_res->next = current_res->next->next;
                 current_res = current_res->next;
                 next_res->next = current_res->next;
                 current_res->next = next_res;
             } else
                 current_res = current_res->next;
         }
     }  /* End of out_of_order loop */
 
     return 0;
 }
 
 
 /**
  * do_pre_bridge_resource_split - find node of resources that are unused
  * @head: new list head
  * @orig_head: original list head
  * @alignment: max node size (?)
  */
 static struct pci_resource *do_pre_bridge_resource_split(struct pci_resource **head,
                 struct pci_resource **orig_head, u32 alignment)
 {
     struct pci_resource *prevnode = NULL;
     struct pci_resource *node;
     struct pci_resource *split_node;
     u32 rc;
     u32 temp_dword;
     dbg("do_pre_bridge_resource_split\n");
 
     if (!(*head) || !(*orig_head))
         return NULL;
 
     rc = cpqhp_resource_sort_and_combine(head);
 
     if (rc)
         return NULL;
 
     if ((*head)->base != (*orig_head)->base)
         return NULL;
 
     if ((*head)->length == (*orig_head)->length)
         return NULL;
 
 
     /* If we got here, there the bridge requires some of the resource, but
      * we may be able to split some off of the front
      */
 
     node = *head;
 
     if (node->length & (alignment - 1)) {
         /* this one isn't an aligned length, so we'll make a new entry
          * and split it up.
          */
         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
         if (!split_node)
             return NULL;
 
         temp_dword = (node->length | (alignment-1)) + 1 - alignment;
 
         split_node->base = node->base;
         split_node->length = temp_dword;
 
         node->length -= temp_dword;
         node->base += split_node->length;
 
         /* Put it in the list */
         *head = split_node;
         split_node->next = node;
     }
 
     if (node->length < alignment)
         return NULL;
 
     /* Now unlink it */
     if (*head == node) {
         *head = node->next;
     } else {
         prevnode = *head;
         while (prevnode->next != node)
             prevnode = prevnode->next;
 
         prevnode->next = node->next;
     }
     node->next = NULL;
 
     return node;
 }
 
 
 /**
  * do_bridge_resource_split - find one node of resources that aren't in use
  * @head: list head
  * @alignment: max node size (?)
  */
 static struct pci_resource *do_bridge_resource_split(struct pci_resource **head, u32 alignment)
 {
     struct pci_resource *prevnode = NULL;
     struct pci_resource *node;
     u32 rc;
     u32 temp_dword;
 
     rc = cpqhp_resource_sort_and_combine(head);
 
     if (rc)
         return NULL;
 
     node = *head;
 
     while (node->next) {
         prevnode = node;
         node = node->next;
         kfree(prevnode);
     }
 
     if (node->length < alignment)
         goto error;
 
     if (node->base & (alignment - 1)) {
         /* Short circuit if adjusted size is too small */
         temp_dword = (node->base | (alignment-1)) + 1;
         if ((node->length - (temp_dword - node->base)) < alignment)
             goto error;
 
         node->length -= (temp_dword - node->base);
         node->base = temp_dword;
     }
 
     if (node->length & (alignment - 1))
         /* There's stuff in use after this node */
         goto error;
 
     return node;
 error:
     kfree(node);
     return NULL;
 }
 
 
 /**
  * get_io_resource - find first node of given size not in ISA aliasing window.
  * @head: list to search
  * @size: size of node to find, must be a power of two.
  *
  * Description: This function sorts the resource list by size and then
  * returns the first node of "size" length that is not in the ISA aliasing
  * window.  If it finds a node larger than "size" it will split it up.
  */
 static struct pci_resource *get_io_resource(struct pci_resource **head, u32 size)
 {
     struct pci_resource *prevnode;
     struct pci_resource *node;
     struct pci_resource *split_node;
     u32 temp_dword;
 
     if (!(*head))
         return NULL;
 
     if (cpqhp_resource_sort_and_combine(head))
         return NULL;
 
     if (sort_by_size(head))
         return NULL;
 
     for (node = *head; node; node = node->next) {
         if (node->length < size)
             continue;
 
         if (node->base & (size - 1)) {
             /* this one isn't base aligned properly
              * so we'll make a new entry and split it up
              */
             temp_dword = (node->base | (size-1)) + 1;
 
             /* Short circuit if adjusted size is too small */
             if ((node->length - (temp_dword - node->base)) < size)
                 continue;
 
             split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
             if (!split_node)
                 return NULL;
 
             split_node->base = node->base;
             split_node->length = temp_dword - node->base;
             node->base = temp_dword;
             node->length -= split_node->length;
 
             /* Put it in the list */
             split_node->next = node->next;
             node->next = split_node;
         } /* End of non-aligned base */
 
         /* Don't need to check if too small since we already did */
         if (node->length > size) {
             /* this one is longer than we need
              * so we'll make a new entry and split it up
              */
             split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
             if (!split_node)
                 return NULL;
 
             split_node->base = node->base + size;
             split_node->length = node->length - size;
             node->length = size;
 
             /* Put it in the list */
             split_node->next = node->next;
             node->next = split_node;
         }  /* End of too big on top end */
 
         /* For IO make sure it's not in the ISA aliasing space */
         if (node->base & 0x300L)
             continue;
 
         /* If we got here, then it is the right size
          * Now take it out of the list and break
          */
         if (*head == node) {
             *head = node->next;
         } else {
             prevnode = *head;
             while (prevnode->next != node)
                 prevnode = prevnode->next;
 
             prevnode->next = node->next;
         }
         node->next = NULL;
         break;
     }
 
     return node;
 }
 
 
 /**
  * get_max_resource - get largest node which has at least the given size.
  * @head: the list to search the node in
  * @size: the minimum size of the node to find
  *
  * Description: Gets the largest node that is at least "size" big from the
  * list pointed to by head.  It aligns the node on top and bottom
  * to "size" alignment before returning it.
  */
 static struct pci_resource *get_max_resource(struct pci_resource **head, u32 size)
 {
     struct pci_resource *max;
     struct pci_resource *temp;
     struct pci_resource *split_node;
     u32 temp_dword;
 
     if (cpqhp_resource_sort_and_combine(head))
         return NULL;
 
     if (sort_by_max_size(head))
         return NULL;
 
     for (max = *head; max; max = max->next) {
         /* If not big enough we could probably just bail,
          * instead we'll continue to the next.
          */
         if (max->length < size)
             continue;
 
         if (max->base & (size - 1)) {
             /* this one isn't base aligned properly
              * so we'll make a new entry and split it up
              */
             temp_dword = (max->base | (size-1)) + 1;
 
             /* Short circuit if adjusted size is too small */
             if ((max->length - (temp_dword - max->base)) < size)
                 continue;
 
             split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
             if (!split_node)
                 return NULL;
 
             split_node->base = max->base;
             split_node->length = temp_dword - max->base;
             max->base = temp_dword;
             max->length -= split_node->length;
 
             split_node->next = max->next;
             max->next = split_node;
         }
 
         if ((max->base + max->length) & (size - 1)) {
             /* this one isn't end aligned properly at the top
              * so we'll make a new entry and split it up
              */
             split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
             if (!split_node)
                 return NULL;
             temp_dword = ((max->base + max->length) & ~(size - 1));
             split_node->base = temp_dword;
             split_node->length = max->length + max->base
                          - split_node->base;
             max->length -= split_node->length;
 
             split_node->next = max->next;
             max->next = split_node;
         }
 
         /* Make sure it didn't shrink too much when we aligned it */
         if (max->length < size)
             continue;
 
         /* Now take it out of the list */
         temp = *head;
         if (temp == max) {
             *head = max->next;
         } else {
             while (temp && temp->next != max)
                 temp = temp->next;
 
             if (temp)
                 temp->next = max->next;
         }
 
         max->next = NULL;
         break;
     }
 
     return max;
 }
 
 
 /**
  * get_resource - find resource of given size and split up larger ones.
  * @head: the list to search for resources
  * @size: the size limit to use
  *
  * Description: This function sorts the resource list by size and then
  * returns the first node of "size" length.  If it finds a node
  * larger than "size" it will split it up.
  *
  * size must be a power of two.
  */
 static struct pci_resource *get_resource(struct pci_resource **head, u32 size)
 {
     struct pci_resource *prevnode;
     struct pci_resource *node;
     struct pci_resource *split_node;
     u32 temp_dword;
 
     if (cpqhp_resource_sort_and_combine(head))
         return NULL;
 
     if (sort_by_size(head))
         return NULL;
 
     for (node = *head; node; node = node->next) {
         dbg("%s: req_size =%x node=%p, base=%x, length=%x\n",
             __func__, size, node, node->base, node->length);
         if (node->length < size)
             continue;
 
         if (node->base & (size - 1)) {
             dbg("%s: not aligned\n", __func__);
             /* this one isn't base aligned properly
              * so we'll make a new entry and split it up
              */
             temp_dword = (node->base | (size-1)) + 1;
 
             /* Short circuit if adjusted size is too small */
             if ((node->length - (temp_dword - node->base)) < size)
                 continue;
 
             split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
             if (!split_node)
                 return NULL;
 
             split_node->base = node->base;
             split_node->length = temp_dword - node->base;
             node->base = temp_dword;
             node->length -= split_node->length;
 
             split_node->next = node->next;
             node->next = split_node;
         } /* End of non-aligned base */
 
         /* Don't need to check if too small since we already did */
         if (node->length > size) {
             dbg("%s: too big\n", __func__);
             /* this one is longer than we need
              * so we'll make a new entry and split it up
              */
             split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 
             if (!split_node)
                 return NULL;
 
             split_node->base = node->base + size;
             split_node->length = node->length - size;
             node->length = size;
 
             /* Put it in the list */
             split_node->next = node->next;
             node->next = split_node;
         }  /* End of too big on top end */
 
         dbg("%s: got one!!!\n", __func__);
         /* If we got here, then it is the right size
          * Now take it out of the list */
         if (*head == node) {
             *head = node->next;
         } else {
             prevnode = *head;
             while (prevnode->next != node)
                 prevnode = prevnode->next;
 
             prevnode->next = node->next;
         }
         node->next = NULL;
         break;
     }
     return node;
 }
 
 
 /**
  * cpqhp_resource_sort_and_combine - sort nodes by base addresses and clean up
  * @head: the list to sort and clean up
  *
  * Description: Sorts all of the nodes in the list in ascending order by
  * their base addresses.  Also does garbage collection by
  * combining adjacent nodes.
  *
  * Returns %0 if success.
  */
 int cpqhp_resource_sort_and_combine(struct pci_resource **head)
 {
     struct pci_resource *node1;
     struct pci_resource *node2;
     int out_of_order = 1;
 
     dbg("%s: head = %p, *head = %p\n", __func__, head, *head);
 
     if (!(*head))
         return 1;
 
     dbg("*head->next = %p\n", (*head)->next);
 
     if (!(*head)->next)
         return 0;   /* only one item on the list, already sorted! */
 
     dbg("*head->base = 0x%x\n", (*head)->base);
     dbg("*head->next->base = 0x%x\n", (*head)->next->base);
     while (out_of_order) {
         out_of_order = 0;
 
         /* Special case for swapping list head */
         if (((*head)->next) &&
             ((*head)->base > (*head)->next->base)) {
             node1 = *head;
             (*head) = (*head)->next;
             node1->next = (*head)->next;
             (*head)->next = node1;
             out_of_order++;
         }
 
         node1 = (*head);
 
         while (node1->next && node1->next->next) {
             if (node1->next->base > node1->next->next->base) {
                 out_of_order++;
                 node2 = node1->next;
                 node1->next = node1->next->next;
                 node1 = node1->next;
                 node2->next = node1->next;
                 node1->next = node2;
             } else
                 node1 = node1->next;
         }
     }  /* End of out_of_order loop */
 
     node1 = *head;
 
     while (node1 && node1->next) {
         if ((node1->base + node1->length) == node1->next->base) {
             /* Combine */
             dbg("8..\n");
             node1->length += node1->next->length;
             node2 = node1->next;
             node1->next = node1->next->next;
             kfree(node2);
         } else
             node1 = node1->next;
     }
 
     return 0;
 }
 
 
 irqreturn_t cpqhp_ctrl_intr(int IRQ, void *data)
 {
     struct controller *ctrl = data;
     u8 schedule_flag = 0;
     u8 reset;
     u16 misc;
     u32 Diff;
 
 
     misc = readw(ctrl->hpc_reg + MISC);
     /*
      * Check to see if it was our interrupt
      */
     if (!(misc & 0x000C))
         return IRQ_NONE;
 
     if (misc & 0x0004) {
         /*
          * Serial Output interrupt Pending
          */
 
         /* Clear the interrupt */
         misc |= 0x0004;
         writew(misc, ctrl->hpc_reg + MISC);
 
         /* Read to clear posted writes */
         misc = readw(ctrl->hpc_reg + MISC);
 
         dbg("%s - waking up\n", __func__);
         wake_up_interruptible(&ctrl->queue);
     }
 
     if (misc & 0x0008) {
         /* General-interrupt-input interrupt Pending */
         Diff = readl(ctrl->hpc_reg + INT_INPUT_CLEAR) ^ ctrl->ctrl_int_comp;
 
         ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
 
         /* Clear the interrupt */
         writel(Diff, ctrl->hpc_reg + INT_INPUT_CLEAR);
 
         /* Read it back to clear any posted writes */
         readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
 
         if (!Diff)
             /* Clear all interrupts */
             writel(0xFFFFFFFF, ctrl->hpc_reg + INT_INPUT_CLEAR);
 
         schedule_flag += handle_switch_change((u8)(Diff & 0xFFL), ctrl);
         schedule_flag += handle_presence_change((u16)((Diff & 0xFFFF0000L) >> 16), ctrl);
         schedule_flag += handle_power_fault((u8)((Diff & 0xFF00L) >> 8), ctrl);
     }
 
     reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
     if (reset & 0x40) {
         /* Bus reset has completed */
         reset &= 0xCF;
         writeb(reset, ctrl->hpc_reg + RESET_FREQ_MODE);
         reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
         wake_up_interruptible(&ctrl->queue);
     }
 
     if (schedule_flag) {
         wake_up_process(cpqhp_event_thread);
         dbg("Waking even thread");
     }
     return IRQ_HANDLED;
 }
 
 
 /**
  * cpqhp_slot_create - Creates a node and adds it to the proper bus.
  * @busnumber: bus where new node is to be located
  *
  * Returns pointer to the new node or %NULL if unsuccessful.
  */
 struct pci_func *cpqhp_slot_create(u8 busnumber)
 {
     struct pci_func *new_slot;
     struct pci_func *next;
 
     new_slot = kzalloc(sizeof(*new_slot), GFP_KERNEL);
     if (new_slot == NULL)
         return new_slot;
 
     new_slot->next = NULL;
     new_slot->configured = 1;
 
     if (cpqhp_slot_list[busnumber] == NULL) {
         cpqhp_slot_list[busnumber] = new_slot;
     } else {
         next = cpqhp_slot_list[busnumber];
         while (next->next != NULL)
             next = next->next;
         next->next = new_slot;
     }
     return new_slot;
 }
 
 
 /**
  * slot_remove - Removes a node from the linked list of slots.
  * @old_slot: slot to remove
  *
  * Returns %0 if successful, !0 otherwise.
  */
 static int slot_remove(struct pci_func *old_slot)
 {
     struct pci_func *next;
 
     if (old_slot == NULL)
         return 1;
 
     next = cpqhp_slot_list[old_slot->bus];
     if (next == NULL)
         return 1;
 
     if (next == old_slot) {
         cpqhp_slot_list[old_slot->bus] = old_slot->next;
         cpqhp_destroy_board_resources(old_slot);
         kfree(old_slot);
         return 0;
     }
 
     while ((next->next != old_slot) && (next->next != NULL))
         next = next->next;
 
     if (next->next == old_slot) {
         next->next = old_slot->next;
         cpqhp_destroy_board_resources(old_slot);
         kfree(old_slot);
         return 0;
     } else
         return 2;
 }
 
 
 /**
  * bridge_slot_remove - Removes a node from the linked list of slots.
  * @bridge: bridge to remove
  *
  * Returns %0 if successful, !0 otherwise.
  */
 static int bridge_slot_remove(struct pci_func *bridge)
 {
     u8 subordinateBus, secondaryBus;
     u8 tempBus;
     struct pci_func *next;
 
     secondaryBus = (bridge->config_space[0x06] >> 8) & 0xFF;
     subordinateBus = (bridge->config_space[0x06] >> 16) & 0xFF;
 
     for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
         next = cpqhp_slot_list[tempBus];
 
         while (!slot_remove(next))
             next = cpqhp_slot_list[tempBus];
     }
 
     next = cpqhp_slot_list[bridge->bus];
 
     if (next == NULL)
         return 1;
 
     if (next == bridge) {
         cpqhp_slot_list[bridge->bus] = bridge->next;
         goto out;
     }
 
     while ((next->next != bridge) && (next->next != NULL))
         next = next->next;
 
     if (next->next != bridge)
         return 2;
     next->next = bridge->next;
 out:
     kfree(bridge);
     return 0;
 }
 
 
 /**
  * cpqhp_slot_find - Looks for a node by bus, and device, multiple functions accessed
  * @bus: bus to find
  * @device: device to find
  * @index: is %0 for first function found, %1 for the second...
  *
  * Returns pointer to the node if successful, %NULL otherwise.
  */
 struct pci_func *cpqhp_slot_find(u8 bus, u8 device, u8 index)
 {
     int found = -1;
     struct pci_func *func;
 
     func = cpqhp_slot_list[bus];
 
     if ((func == NULL) || ((func->device == device) && (index == 0)))
         return func;
 
     if (func->device == device)
         found++;
 
     while (func->next != NULL) {
         func = func->next;
 
         if (func->device == device)
             found++;
 
         if (found == index)
             return func;
     }
 
     return NULL;
 }
 
 
 /* DJZ: I don't think is_bridge will work as is.
  * FIXME */
 static int is_bridge(struct pci_func *func)
 {
     /* Check the header type */
     if (((func->config_space[0x03] >> 16) & 0xFF) == 0x01)
         return 1;
     else
         return 0;
 }
 
 
 /**
  * set_controller_speed - set the frequency and/or mode of a specific controller segment.
  * @ctrl: controller to change frequency/mode for.
  * @adapter_speed: the speed of the adapter we want to match.
  * @hp_slot: the slot number where the adapter is installed.
  *
  * Returns %0 if we successfully change frequency and/or mode to match the
  * adapter speed.
  */
 static u8 set_controller_speed(struct controller *ctrl, u8 adapter_speed, u8 hp_slot)
 {
     struct slot *slot;
     struct pci_bus *bus = ctrl->pci_bus;
     u8 reg;
     u8 slot_power = readb(ctrl->hpc_reg + SLOT_POWER);
     u16 reg16;
     u32 leds = readl(ctrl->hpc_reg + LED_CONTROL);
 
     if (bus->cur_bus_speed == adapter_speed)
         return 0;
 
     /* We don't allow freq/mode changes if we find another adapter running
      * in another slot on this controller
      */
     for (slot = ctrl->slot; slot; slot = slot->next) {
         if (slot->device == (hp_slot + ctrl->slot_device_offset))
             continue;
         if (get_presence_status(ctrl, slot) == 0)
             continue;
         /* If another adapter is running on the same segment but at a
          * lower speed/mode, we allow the new adapter to function at
          * this rate if supported
          */
         if (bus->cur_bus_speed < adapter_speed)
             return 0;
 
         return 1;
     }
 
     /* If the controller doesn't support freq/mode changes and the
      * controller is running at a higher mode, we bail
      */
     if ((bus->cur_bus_speed > adapter_speed) && (!ctrl->pcix_speed_capability))
         return 1;
 
     /* But we allow the adapter to run at a lower rate if possible */
     if ((bus->cur_bus_speed < adapter_speed) && (!ctrl->pcix_speed_capability))
         return 0;
 
     /* We try to set the max speed supported by both the adapter and
      * controller
      */
     if (bus->max_bus_speed < adapter_speed) {
         if (bus->cur_bus_speed == bus->max_bus_speed)
             return 0;
         adapter_speed = bus->max_bus_speed;
     }
 
     writel(0x0L, ctrl->hpc_reg + LED_CONTROL);
     writeb(0x00, ctrl->hpc_reg + SLOT_ENABLE);
 
     set_SOGO(ctrl);
     wait_for_ctrl_irq(ctrl);
 
     if (adapter_speed != PCI_SPEED_133MHz_PCIX)
         reg = 0xF5;
     else
         reg = 0xF4;
     pci_write_config_byte(ctrl->pci_dev, 0x41, reg);
 
     reg16 = readw(ctrl->hpc_reg + NEXT_CURR_FREQ);
     reg16 &= ~0x000F;
     switch (adapter_speed) {
         case(PCI_SPEED_133MHz_PCIX):
             reg = 0x75;
             reg16 |= 0xB;
             break;
         case(PCI_SPEED_100MHz_PCIX):
             reg = 0x74;
             reg16 |= 0xA;
             break;
         case(PCI_SPEED_66MHz_PCIX):
             reg = 0x73;
             reg16 |= 0x9;
             break;
         case(PCI_SPEED_66MHz):
             reg = 0x73;
             reg16 |= 0x1;
             break;
         default: /* 33MHz PCI 2.2 */
             reg = 0x71;
             break;
 
     }
     reg16 |= 0xB << 12;
     writew(reg16, ctrl->hpc_reg + NEXT_CURR_FREQ);
 
     mdelay(5);
 
     /* Re-enable interrupts */
     writel(0, ctrl->hpc_reg + INT_MASK);
 
     pci_write_config_byte(ctrl->pci_dev, 0x41, reg);
 
     /* Restart state machine */
     reg = ~0xF;
     pci_read_config_byte(ctrl->pci_dev, 0x43, &reg);
     pci_write_config_byte(ctrl->pci_dev, 0x43, reg);
 
     /* Only if mode change...*/
     if (((bus->cur_bus_speed == PCI_SPEED_66MHz) && (adapter_speed == PCI_SPEED_66MHz_PCIX)) ||
         ((bus->cur_bus_speed == PCI_SPEED_66MHz_PCIX) && (adapter_speed == PCI_SPEED_66MHz)))
             set_SOGO(ctrl);
 
     wait_for_ctrl_irq(ctrl);
     mdelay(1100);
 
     /* Restore LED/Slot state */
     writel(leds, ctrl->hpc_reg + LED_CONTROL);
     writeb(slot_power, ctrl->hpc_reg + SLOT_ENABLE);
 
     set_SOGO(ctrl);
     wait_for_ctrl_irq(ctrl);
 
     bus->cur_bus_speed = adapter_speed;
     slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 
     info("Successfully changed frequency/mode for adapter in slot %d\n",
             slot->number);
     return 0;
 }
 
 /* the following routines constitute the bulk of the
  * hotplug controller logic
  */
 
 
 /**
  * board_replaced - Called after a board has been replaced in the system.
  * @func: PCI device/function information
  * @ctrl: hotplug controller
  *
  * This is only used if we don't have resources for hot add.
  * Turns power on for the board.
  * Checks to see if board is the same.
  * If board is same, reconfigures it.
  * If board isn't same, turns it back off.
  */
 static u32 board_replaced(struct pci_func *func, struct controller *ctrl)
 {
     struct pci_bus *bus = ctrl->pci_bus;
     u8 hp_slot;
     u8 temp_byte;
     u8 adapter_speed;
     u32 rc = 0;
 
     hp_slot = func->device - ctrl->slot_device_offset;
 
     /*
      * The switch is open.
      */
     if (readl(ctrl->hpc_reg + INT_INPUT_CLEAR) & (0x01L << hp_slot))
         rc = INTERLOCK_OPEN;
     /*
      * The board is already on
      */
     else if (is_slot_enabled(ctrl, hp_slot))
         rc = CARD_FUNCTIONING;
     else {
         mutex_lock(&ctrl->crit_sect);
 
         /* turn on board without attaching to the bus */
         enable_slot_power(ctrl, hp_slot);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
 
         /* Change bits in slot power register to force another shift out
          * NOTE: this is to work around the timer bug */
         temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
         writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
         writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
 
         adapter_speed = get_adapter_speed(ctrl, hp_slot);
         if (bus->cur_bus_speed != adapter_speed)
             if (set_controller_speed(ctrl, adapter_speed, hp_slot))
                 rc = WRONG_BUS_FREQUENCY;
 
         /* turn off board without attaching to the bus */
         disable_slot_power(ctrl, hp_slot);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
 
         mutex_unlock(&ctrl->crit_sect);
 
         if (rc)
             return rc;
 
         mutex_lock(&ctrl->crit_sect);
 
         slot_enable(ctrl, hp_slot);
         green_LED_blink(ctrl, hp_slot);
 
         amber_LED_off(ctrl, hp_slot);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
 
         mutex_unlock(&ctrl->crit_sect);
 
         /* Wait for ~1 second because of hot plug spec */
         long_delay(1*HZ);
 
         /* Check for a power fault */
         if (func->status == 0xFF) {
             /* power fault occurred, but it was benign */
             rc = POWER_FAILURE;
             func->status = 0;
         } else
             rc = cpqhp_valid_replace(ctrl, func);
 
         if (!rc) {
             /* It must be the same board */
 
             rc = cpqhp_configure_board(ctrl, func);
 
             /* If configuration fails, turn it off
              * Get slot won't work for devices behind
              * bridges, but in this case it will always be
              * called for the "base" bus/dev/func of an
              * adapter.
              */
 
             mutex_lock(&ctrl->crit_sect);
 
             amber_LED_on(ctrl, hp_slot);
             green_LED_off(ctrl, hp_slot);
             slot_disable(ctrl, hp_slot);
 
             set_SOGO(ctrl);
 
             /* Wait for SOBS to be unset */
             wait_for_ctrl_irq(ctrl);
 
             mutex_unlock(&ctrl->crit_sect);
 
             if (rc)
                 return rc;
             else
                 return 1;
 
         } else {
             /* Something is wrong
 
              * Get slot won't work for devices behind bridges, but
              * in this case it will always be called for the "base"
              * bus/dev/func of an adapter.
              */
 
             mutex_lock(&ctrl->crit_sect);
 
             amber_LED_on(ctrl, hp_slot);
             green_LED_off(ctrl, hp_slot);
             slot_disable(ctrl, hp_slot);
 
             set_SOGO(ctrl);
 
             /* Wait for SOBS to be unset */
             wait_for_ctrl_irq(ctrl);
 
             mutex_unlock(&ctrl->crit_sect);
         }
 
     }
     return rc;
 
 }
 
 
 /**
  * board_added - Called after a board has been added to the system.
  * @func: PCI device/function info
  * @ctrl: hotplug controller
  *
  * Turns power on for the board.
  * Configures board.
  */
 static u32 board_added(struct pci_func *func, struct controller *ctrl)
 {
     u8 hp_slot;
     u8 temp_byte;
     u8 adapter_speed;
     int index;
     u32 temp_register = 0xFFFFFFFF;
     u32 rc = 0;
     struct pci_func *new_slot = NULL;
     struct pci_bus *bus = ctrl->pci_bus;
     struct resource_lists res_lists;
 
     hp_slot = func->device - ctrl->slot_device_offset;
     dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n",
         __func__, func->device, ctrl->slot_device_offset, hp_slot);
 
     mutex_lock(&ctrl->crit_sect);
 
     /* turn on board without attaching to the bus */
     enable_slot_power(ctrl, hp_slot);
 
     set_SOGO(ctrl);
 
     /* Wait for SOBS to be unset */
     wait_for_ctrl_irq(ctrl);
 
     /* Change bits in slot power register to force another shift out
      * NOTE: this is to work around the timer bug
      */
     temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
     writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
     writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);
 
     set_SOGO(ctrl);
 
     /* Wait for SOBS to be unset */
     wait_for_ctrl_irq(ctrl);
 
     adapter_speed = get_adapter_speed(ctrl, hp_slot);
     if (bus->cur_bus_speed != adapter_speed)
         if (set_controller_speed(ctrl, adapter_speed, hp_slot))
             rc = WRONG_BUS_FREQUENCY;
 
     /* turn off board without attaching to the bus */
     disable_slot_power(ctrl, hp_slot);
 
     set_SOGO(ctrl);
 
     /* Wait for SOBS to be unset */
     wait_for_ctrl_irq(ctrl);
 
     mutex_unlock(&ctrl->crit_sect);
 
     if (rc)
         return rc;
 
     cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 
     /* turn on board and blink green LED */
 
     dbg("%s: before down\n", __func__);
     mutex_lock(&ctrl->crit_sect);
     dbg("%s: after down\n", __func__);
 
     dbg("%s: before slot_enable\n", __func__);
     slot_enable(ctrl, hp_slot);
 
     dbg("%s: before green_LED_blink\n", __func__);
     green_LED_blink(ctrl, hp_slot);
 
     dbg("%s: before amber_LED_blink\n", __func__);
     amber_LED_off(ctrl, hp_slot);
 
     dbg("%s: before set_SOGO\n", __func__);
     set_SOGO(ctrl);
 
     /* Wait for SOBS to be unset */
     dbg("%s: before wait_for_ctrl_irq\n", __func__);
     wait_for_ctrl_irq(ctrl);
     dbg("%s: after wait_for_ctrl_irq\n", __func__);
 
     dbg("%s: before up\n", __func__);
     mutex_unlock(&ctrl->crit_sect);
     dbg("%s: after up\n", __func__);
 
     /* Wait for ~1 second because of hot plug spec */
     dbg("%s: before long_delay\n", __func__);
     long_delay(1*HZ);
     dbg("%s: after long_delay\n", __func__);
 
     dbg("%s: func status = %x\n", __func__, func->status);
     /* Check for a power fault */
     if (func->status == 0xFF) {
         /* power fault occurred, but it was benign */
         temp_register = 0xFFFFFFFF;
         dbg("%s: temp register set to %x by power fault\n", __func__, temp_register);
         rc = POWER_FAILURE;
         func->status = 0;
     } else {
         /* Get vendor/device ID u32 */
         ctrl->pci_bus->number = func->bus;
         rc = pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, func->function), PCI_VENDOR_ID, &temp_register);
         dbg("%s: pci_read_config_dword returns %d\n", __func__, rc);
         dbg("%s: temp_register is %x\n", __func__, temp_register);
 
         if (rc != 0) {
             /* Something's wrong here */
             temp_register = 0xFFFFFFFF;
             dbg("%s: temp register set to %x by error\n", __func__, temp_register);
         }
         /* Preset return code.  It will be changed later if things go okay. */
         rc = NO_ADAPTER_PRESENT;
     }
 
     /* All F's is an empty slot or an invalid board */
     if (temp_register != 0xFFFFFFFF) {
         res_lists.io_head = ctrl->io_head;
         res_lists.mem_head = ctrl->mem_head;
         res_lists.p_mem_head = ctrl->p_mem_head;
         res_lists.bus_head = ctrl->bus_head;
         res_lists.irqs = NULL;
 
         rc = configure_new_device(ctrl, func, 0, &res_lists);
 
         dbg("%s: back from configure_new_device\n", __func__);
         ctrl->io_head = res_lists.io_head;
         ctrl->mem_head = res_lists.mem_head;
         ctrl->p_mem_head = res_lists.p_mem_head;
         ctrl->bus_head = res_lists.bus_head;
 
         cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
         cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
         cpqhp_resource_sort_and_combine(&(ctrl->io_head));
         cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
 
         if (rc) {
             mutex_lock(&ctrl->crit_sect);
 
             amber_LED_on(ctrl, hp_slot);
             green_LED_off(ctrl, hp_slot);
             slot_disable(ctrl, hp_slot);
 
             set_SOGO(ctrl);
 
             /* Wait for SOBS to be unset */
             wait_for_ctrl_irq(ctrl);
 
             mutex_unlock(&ctrl->crit_sect);
             return rc;
         } else {
             cpqhp_save_slot_config(ctrl, func);
         }
 
 
         func->status = 0;
         func->switch_save = 0x10;
         func->is_a_board = 0x01;
 
         /* next, we will instantiate the linux pci_dev structures (with
          * appropriate driver notification, if already present) */
         dbg("%s: configure linux pci_dev structure\n", __func__);
         index = 0;
         do {
             new_slot = cpqhp_slot_find(ctrl->bus, func->device, index++);
             if (new_slot && !new_slot->pci_dev)
                 cpqhp_configure_device(ctrl, new_slot);
         } while (new_slot);
 
         mutex_lock(&ctrl->crit_sect);
 
         green_LED_on(ctrl, hp_slot);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
 
         mutex_unlock(&ctrl->crit_sect);
     } else {
         mutex_lock(&ctrl->crit_sect);
 
         amber_LED_on(ctrl, hp_slot);
         green_LED_off(ctrl, hp_slot);
         slot_disable(ctrl, hp_slot);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
 
         mutex_unlock(&ctrl->crit_sect);
 
         return rc;
     }
     return 0;
 }
 
 
 /**
  * remove_board - Turns off slot and LEDs
  * @func: PCI device/function info
  * @replace_flag: whether replacing or adding a new device
  * @ctrl: target controller
  */
 static u32 remove_board(struct pci_func *func, u32 replace_flag, struct controller *ctrl)
 {
     int index;
     u8 skip = 0;
     u8 device;
     u8 hp_slot;
     u8 temp_byte;
     struct resource_lists res_lists;
     struct pci_func *temp_func;
 
     if (cpqhp_unconfigure_device(func))
         return 1;
 
     device = func->device;
 
     hp_slot = func->device - ctrl->slot_device_offset;
     dbg("In %s, hp_slot = %d\n", __func__, hp_slot);
 
     /* When we get here, it is safe to change base address registers.
      * We will attempt to save the base address register lengths */
     if (replace_flag || !ctrl->add_support)
         cpqhp_save_base_addr_length(ctrl, func);
     else if (!func->bus_head && !func->mem_head &&
          !func->p_mem_head && !func->io_head) {
         /* Here we check to see if we've saved any of the board's
          * resources already.  If so, we'll skip the attempt to
          * determine what's being used. */
         index = 0;
         temp_func = cpqhp_slot_find(func->bus, func->device, index++);
         while (temp_func) {
             if (temp_func->bus_head || temp_func->mem_head
                 || temp_func->p_mem_head || temp_func->io_head) {
                 skip = 1;
                 break;
             }
             temp_func = cpqhp_slot_find(temp_func->bus, temp_func->device, index++);
         }
 
         if (!skip)
             cpqhp_save_used_resources(ctrl, func);
     }
     /* Change status to shutdown */
     if (func->is_a_board)
         func->status = 0x01;
     func->configured = 0;
 
     mutex_lock(&ctrl->crit_sect);
 
     green_LED_off(ctrl, hp_slot);
     slot_disable(ctrl, hp_slot);
 
     set_SOGO(ctrl);
 
     /* turn off SERR for slot */
     temp_byte = readb(ctrl->hpc_reg + SLOT_SERR);
     temp_byte &= ~(0x01 << hp_slot);
     writeb(temp_byte, ctrl->hpc_reg + SLOT_SERR);
 
     /* Wait for SOBS to be unset */
     wait_for_ctrl_irq(ctrl);
 
     mutex_unlock(&ctrl->crit_sect);
 
     if (!replace_flag && ctrl->add_support) {
         while (func) {
             res_lists.io_head = ctrl->io_head;
             res_lists.mem_head = ctrl->mem_head;
             res_lists.p_mem_head = ctrl->p_mem_head;
             res_lists.bus_head = ctrl->bus_head;
 
             cpqhp_return_board_resources(func, &res_lists);
 
             ctrl->io_head = res_lists.io_head;
             ctrl->mem_head = res_lists.mem_head;
             ctrl->p_mem_head = res_lists.p_mem_head;
             ctrl->bus_head = res_lists.bus_head;
 
             cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
             cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
             cpqhp_resource_sort_and_combine(&(ctrl->io_head));
             cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
 
             if (is_bridge(func)) {
                 bridge_slot_remove(func);
             } else
                 slot_remove(func);
 
             func = cpqhp_slot_find(ctrl->bus, device, 0);
         }
 
         /* Setup slot structure with entry for empty slot */
         func = cpqhp_slot_create(ctrl->bus);
 
         if (func == NULL)
             return 1;
 
         func->bus = ctrl->bus;
         func->device = device;
         func->function = 0;
         func->configured = 0;
         func->switch_save = 0x10;
         func->is_a_board = 0;
         func->p_task_event = NULL;
     }
 
     return 0;
 }
 
 static void pushbutton_helper_thread(struct timer_list *t)
 {
     pushbutton_pending = t;
 
     wake_up_process(cpqhp_event_thread);
 }
 
 
 /* this is the main worker thread */
 static int event_thread(void *data)
 {
     struct controller *ctrl;
 
     while (1) {
         dbg("!!!!event_thread sleeping\n");
         set_current_state(TASK_INTERRUPTIBLE);
         schedule();
 
         if (kthread_should_stop())
             break;
         /* Do stuff here */
         if (pushbutton_pending)
             cpqhp_pushbutton_thread(pushbutton_pending);
         else
             for (ctrl = cpqhp_ctrl_list; ctrl; ctrl = ctrl->next)
                 interrupt_event_handler(ctrl);
     }
     dbg("event_thread signals exit\n");
     return 0;
 }
 
 int cpqhp_event_start_thread(void)
 {
     cpqhp_event_thread = kthread_run(event_thread, NULL, "phpd_event");
     if (IS_ERR(cpqhp_event_thread)) {
         err("Can't start up our event thread\n");
         return PTR_ERR(cpqhp_event_thread);
     }
 
     return 0;
 }
 
 
 void cpqhp_event_stop_thread(void)
 {
     kthread_stop(cpqhp_event_thread);
 }
 
 
 static void interrupt_event_handler(struct controller *ctrl)
 {
     int loop;
     int change = 1;
     struct pci_func *func;
     u8 hp_slot;
     struct slot *p_slot;
 
     while (change) {
         change = 0;
 
         for (loop = 0; loop < 10; loop++) {
             /* dbg("loop %d\n", loop); */
             if (ctrl->event_queue[loop].event_type != 0) {
                 hp_slot = ctrl->event_queue[loop].hp_slot;
 
                 func = cpqhp_slot_find(ctrl->bus, (hp_slot + ctrl->slot_device_offset), 0);
                 if (!func)
                     return;
 
                 p_slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
                 if (!p_slot)
                     return;
 
                 dbg("hp_slot %d, func %p, p_slot %p\n",
                     hp_slot, func, p_slot);
 
                 if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
                     dbg("button pressed\n");
                 } else if (ctrl->event_queue[loop].event_type ==
                        INT_BUTTON_CANCEL) {
                     dbg("button cancel\n");
                     del_timer(&p_slot->task_event);
 
                     mutex_lock(&ctrl->crit_sect);
 
                     if (p_slot->state == BLINKINGOFF_STATE) {
                         /* slot is on */
                         dbg("turn on green LED\n");
                         green_LED_on(ctrl, hp_slot);
                     } else if (p_slot->state == BLINKINGON_STATE) {
                         /* slot is off */
                         dbg("turn off green LED\n");
                         green_LED_off(ctrl, hp_slot);
                     }
 
                     info(msg_button_cancel, p_slot->number);
 
                     p_slot->state = STATIC_STATE;
 
                     amber_LED_off(ctrl, hp_slot);
 
                     set_SOGO(ctrl);
 
                     /* Wait for SOBS to be unset */
                     wait_for_ctrl_irq(ctrl);
 
                     mutex_unlock(&ctrl->crit_sect);
                 }
                 /*** button Released (No action on press...) */
                 else if (ctrl->event_queue[loop].event_type == INT_BUTTON_RELEASE) {
                     dbg("button release\n");
 
                     if (is_slot_enabled(ctrl, hp_slot)) {
                         dbg("slot is on\n");
                         p_slot->state = BLINKINGOFF_STATE;
                         info(msg_button_off, p_slot->number);
                     } else {
                         dbg("slot is off\n");
                         p_slot->state = BLINKINGON_STATE;
                         info(msg_button_on, p_slot->number);
                     }
                     mutex_lock(&ctrl->crit_sect);
 
                     dbg("blink green LED and turn off amber\n");
 
                     amber_LED_off(ctrl, hp_slot);
                     green_LED_blink(ctrl, hp_slot);
 
                     set_SOGO(ctrl);
 
                     /* Wait for SOBS to be unset */
                     wait_for_ctrl_irq(ctrl);
 
                     mutex_unlock(&ctrl->crit_sect);
                     timer_setup(&p_slot->task_event,
                             pushbutton_helper_thread,
                             0);
                     p_slot->hp_slot = hp_slot;
                     p_slot->ctrl = ctrl;
 /*                  p_slot->physical_slot = physical_slot; */
                     p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
 
                     dbg("add_timer p_slot = %p\n", p_slot);
                     add_timer(&p_slot->task_event);
                 }
                 /***********POWER FAULT */
                 else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
                     dbg("power fault\n");
                 }
 
                 ctrl->event_queue[loop].event_type = 0;
 
                 change = 1;
             }
         }       /* End of FOR loop */
     }
 }
 
 
 /**
  * cpqhp_pushbutton_thread - handle pushbutton events
  * @t: pointer to struct timer_list which holds all timer-related callbacks
  *
  * Scheduled procedure to handle blocking stuff for the pushbuttons.
  * Handles all pending events and exits.
  */
 void cpqhp_pushbutton_thread(struct timer_list *t)
 {
     u8 hp_slot;
     struct pci_func *func;
     struct slot *p_slot = from_timer(p_slot, t, task_event);
     struct controller *ctrl = (struct controller *) p_slot->ctrl;
 
     pushbutton_pending = NULL;
     hp_slot = p_slot->hp_slot;
 
     if (is_slot_enabled(ctrl, hp_slot)) {
         p_slot->state = POWEROFF_STATE;
         /* power Down board */
         func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
         dbg("In power_down_board, func = %p, ctrl = %p\n", func, ctrl);
         if (!func) {
             dbg("Error! func NULL in %s\n", __func__);
             return;
         }
 
         if (cpqhp_process_SS(ctrl, func) != 0) {
             amber_LED_on(ctrl, hp_slot);
             green_LED_on(ctrl, hp_slot);
 
             set_SOGO(ctrl);
 
             /* Wait for SOBS to be unset */
             wait_for_ctrl_irq(ctrl);
         }
 
         p_slot->state = STATIC_STATE;
     } else {
         p_slot->state = POWERON_STATE;
         /* slot is off */
 
         func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
         dbg("In add_board, func = %p, ctrl = %p\n", func, ctrl);
         if (!func) {
             dbg("Error! func NULL in %s\n", __func__);
             return;
         }
 
         if (ctrl != NULL) {
             if (cpqhp_process_SI(ctrl, func) != 0) {
                 amber_LED_on(ctrl, hp_slot);
                 green_LED_off(ctrl, hp_slot);
 
                 set_SOGO(ctrl);
 
                 /* Wait for SOBS to be unset */
                 wait_for_ctrl_irq(ctrl);
             }
         }
 
         p_slot->state = STATIC_STATE;
     }
 }
 
 
 int cpqhp_process_SI(struct controller *ctrl, struct pci_func *func)
 {
     u8 device, hp_slot;
     u16 temp_word;
     u32 tempdword;
     int rc;
     struct slot *p_slot;
 
     tempdword = 0;
 
     device = func->device;
     hp_slot = device - ctrl->slot_device_offset;
     p_slot = cpqhp_find_slot(ctrl, device);
 
     /* Check to see if the interlock is closed */
     tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
 
     if (tempdword & (0x01 << hp_slot))
         return 1;
 
     if (func->is_a_board) {
         rc = board_replaced(func, ctrl);
     } else {
         /* add board */
         slot_remove(func);
 
         func = cpqhp_slot_create(ctrl->bus);
         if (func == NULL)
             return 1;
 
         func->bus = ctrl->bus;
         func->device = device;
         func->function = 0;
         func->configured = 0;
         func->is_a_board = 1;
 
         /* We have to save the presence info for these slots */
         temp_word = ctrl->ctrl_int_comp >> 16;
         func->presence_save = (temp_word >> hp_slot) & 0x01;
         func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
 
         if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
             func->switch_save = 0;
         } else {
             func->switch_save = 0x10;
         }
 
         rc = board_added(func, ctrl);
         if (rc) {
             if (is_bridge(func)) {
                 bridge_slot_remove(func);
             } else
                 slot_remove(func);
 
             /* Setup slot structure with entry for empty slot */
             func = cpqhp_slot_create(ctrl->bus);
 
             if (func == NULL)
                 return 1;
 
             func->bus = ctrl->bus;
             func->device = device;
             func->function = 0;
             func->configured = 0;
             func->is_a_board = 0;
 
             /* We have to save the presence info for these slots */
             temp_word = ctrl->ctrl_int_comp >> 16;
             func->presence_save = (temp_word >> hp_slot) & 0x01;
             func->presence_save |=
             (temp_word >> (hp_slot + 7)) & 0x02;
 
             if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
                 func->switch_save = 0;
             } else {
                 func->switch_save = 0x10;
             }
         }
     }
 
     if (rc)
         dbg("%s: rc = %d\n", __func__, rc);
 
     return rc;
 }
 
 
 int cpqhp_process_SS(struct controller *ctrl, struct pci_func *func)
 {
     u8 device, class_code, header_type, BCR;
     u8 index = 0;
     u8 replace_flag;
     u32 rc = 0;
     unsigned int devfn;
     struct slot *p_slot;
     struct pci_bus *pci_bus = ctrl->pci_bus;
 
     device = func->device;
     func = cpqhp_slot_find(ctrl->bus, device, index++);
     p_slot = cpqhp_find_slot(ctrl, device);
 
     /* Make sure there are no video controllers here */
     while (func && !rc) {
         pci_bus->number = func->bus;
         devfn = PCI_DEVFN(func->device, func->function);
 
         /* Check the Class Code */
         rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
         if (rc)
             return rc;
 
         if (class_code == PCI_BASE_CLASS_DISPLAY) {
             /* Display/Video adapter (not supported) */
             rc = REMOVE_NOT_SUPPORTED;
         } else {
             /* See if it's a bridge */
             rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
             if (rc)
                 return rc;
 
             /* If it's a bridge, check the VGA Enable bit */
             if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
                 rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
                 if (rc)
                     return rc;
 
                 /* If the VGA Enable bit is set, remove isn't
                  * supported */
                 if (BCR & PCI_BRIDGE_CTL_VGA)
                     rc = REMOVE_NOT_SUPPORTED;
             }
         }
 
         func = cpqhp_slot_find(ctrl->bus, device, index++);
     }
 
     func = cpqhp_slot_find(ctrl->bus, device, 0);
     if ((func != NULL) && !rc) {
         /* FIXME: Replace flag should be passed into process_SS */
         replace_flag = !(ctrl->add_support);
         rc = remove_board(func, replace_flag, ctrl);
     } else if (!rc) {
         rc = 1;
     }
 
     return rc;
 }
 
 /**
  * switch_leds - switch the leds, go from one site to the other.
  * @ctrl: controller to use
  * @num_of_slots: number of slots to use
  * @work_LED: LED control value
  * @direction: 1 to start from the left side, 0 to start right.
  */
 static void switch_leds(struct controller *ctrl, const int num_of_slots,
             u32 *work_LED, const int direction)
 {
     int loop;
 
     for (loop = 0; loop < num_of_slots; loop++) {
         if (direction)
             *work_LED = *work_LED >> 1;
         else
             *work_LED = *work_LED << 1;
         writel(*work_LED, ctrl->hpc_reg + LED_CONTROL);
 
         set_SOGO(ctrl);
 
         /* Wait for SOGO interrupt */
         wait_for_ctrl_irq(ctrl);
 
         /* Get ready for next iteration */
         long_delay((2*HZ)/10);
     }
 }
 
 /**
  * cpqhp_hardware_test - runs hardware tests
  * @ctrl: target controller
  * @test_num: the number written to the "test" file in sysfs.
  *
  * For hot plug ctrl folks to play with.
  */
 int cpqhp_hardware_test(struct controller *ctrl, int test_num)
 {
     u32 save_LED;
     u32 work_LED;
     int loop;
     int num_of_slots;
 
     num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0f;
 
     switch (test_num) {
     case 1:
         /* Do stuff here! */
 
         /* Do that funky LED thing */
         /* so we can restore them later */
         save_LED = readl(ctrl->hpc_reg + LED_CONTROL);
         work_LED = 0x01010101;
         switch_leds(ctrl, num_of_slots, &work_LED, 0);
         switch_leds(ctrl, num_of_slots, &work_LED, 1);
         switch_leds(ctrl, num_of_slots, &work_LED, 0);
         switch_leds(ctrl, num_of_slots, &work_LED, 1);
 
         work_LED = 0x01010000;
         writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
         switch_leds(ctrl, num_of_slots, &work_LED, 0);
         switch_leds(ctrl, num_of_slots, &work_LED, 1);
         work_LED = 0x00000101;
         writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
         switch_leds(ctrl, num_of_slots, &work_LED, 0);
         switch_leds(ctrl, num_of_slots, &work_LED, 1);
 
         work_LED = 0x01010000;
         writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
         for (loop = 0; loop < num_of_slots; loop++) {
             set_SOGO(ctrl);
 
             /* Wait for SOGO interrupt */
             wait_for_ctrl_irq(ctrl);
 
             /* Get ready for next iteration */
             long_delay((3*HZ)/10);
             work_LED = work_LED >> 16;
             writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
 
             set_SOGO(ctrl);
 
             /* Wait for SOGO interrupt */
             wait_for_ctrl_irq(ctrl);
 
             /* Get ready for next iteration */
             long_delay((3*HZ)/10);
             work_LED = work_LED << 16;
             writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
             work_LED = work_LED << 1;
             writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
         }
 
         /* put it back the way it was */
         writel(save_LED, ctrl->hpc_reg + LED_CONTROL);
 
         set_SOGO(ctrl);
 
         /* Wait for SOBS to be unset */
         wait_for_ctrl_irq(ctrl);
         break;
     case 2:
         /* Do other stuff here! */
         break;
     case 3:
         /* and more... */
         break;
     }
     return 0;
 }
 
 
 /**
  * configure_new_device - Configures the PCI header information of one board.
  * @ctrl: pointer to controller structure
  * @func: pointer to function structure
  * @behind_bridge: 1 if this is a recursive call, 0 if not
  * @resources: pointer to set of resource lists
  *
  * Returns 0 if success.
  */
 static u32 configure_new_device(struct controller  *ctrl, struct pci_func  *func,
                  u8 behind_bridge, struct resource_lists  *resources)
 {
     u8 temp_byte, function, max_functions, stop_it;
     int rc;
     u32 ID;
     struct pci_func *new_slot;
     int index;
 
     new_slot = func;
 
     dbg("%s\n", __func__);
     /* Check for Multi-function device */
     ctrl->pci_bus->number = func->bus;
     rc = pci_bus_read_config_byte(ctrl->pci_bus, PCI_DEVFN(func->device, func->function), 0x0E, &temp_byte);
     if (rc) {
         dbg("%s: rc = %d\n", __func__, rc);
         return rc;
     }
 
     if (temp_byte & 0x80)   /* Multi-function device */
         max_functions = 8;
     else
         max_functions = 1;
 
     function = 0;
 
     do {
         rc = configure_new_function(ctrl, new_slot, behind_bridge, resources);
 
         if (rc) {
             dbg("configure_new_function failed %d\n", rc);
             index = 0;
 
             while (new_slot) {
                 new_slot = cpqhp_slot_find(new_slot->bus, new_slot->device, index++);
 
                 if (new_slot)
                     cpqhp_return_board_resources(new_slot, resources);
             }
 
             return rc;
         }
 
         function++;
 
         stop_it = 0;
 
         /* The following loop skips to the next present function
          * and creates a board structure */
 
         while ((function < max_functions) && (!stop_it)) {
             pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID);
 
             if (PCI_POSSIBLE_ERROR(ID)) {
                 function++;
             } else {
                 /* Setup slot structure. */
                 new_slot = cpqhp_slot_create(func->bus);
 
                 if (new_slot == NULL)
                     return 1;
 
                 new_slot->bus = func->bus;
                 new_slot->device = func->device;
                 new_slot->function = function;
                 new_slot->is_a_board = 1;
                 new_slot->status = 0;
 
                 stop_it++;
             }
         }
 
     } while (function < max_functions);
     dbg("returning from configure_new_device\n");
 
     return 0;
 }
 
 
 /*
  * Configuration logic that involves the hotplug data structures and
  * their bookkeeping
  */
 
 
 /**
  * configure_new_function - Configures the PCI header information of one device
  * @ctrl: pointer to controller structure
  * @func: pointer to function structure
  * @behind_bridge: 1 if this is a recursive call, 0 if not
  * @resources: pointer to set of resource lists
  *
  * Calls itself recursively for bridged devices.
  * Returns 0 if success.
  */
 static int configure_new_function(struct controller *ctrl, struct pci_func *func,
                    u8 behind_bridge,
                    struct resource_lists *resources)
 {
     int cloop;
     u8 IRQ = 0;
     u8 temp_byte;
     u8 device;
     u8 class_code;
     u16 command;
     u16 temp_word;
     u32 temp_dword;
     u32 rc;
     u32 temp_register;
     u32 base;
     u32 ID;
     unsigned int devfn;
     struct pci_resource *mem_node;
     struct pci_resource *p_mem_node;
     struct pci_resource *io_node;
     struct pci_resource *bus_node;
     struct pci_resource *hold_mem_node;
     struct pci_resource *hold_p_mem_node;
     struct pci_resource *hold_IO_node;
     struct pci_resource *hold_bus_node;
     struct irq_mapping irqs;
     struct pci_func *new_slot;
     struct pci_bus *pci_bus;
     struct resource_lists temp_resources;
 
     pci_bus = ctrl->pci_bus;
     pci_bus->number = func->bus;
     devfn = PCI_DEVFN(func->device, func->function);
 
     /* Check for Bridge */
     rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &temp_byte);
     if (rc)
         return rc;
 
     if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
         /* set Primary bus */
         dbg("set Primary bus = %d\n", func->bus);
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_PRIMARY_BUS, func->bus);
         if (rc)
             return rc;
 
         /* find range of buses to use */
         dbg("find ranges of buses to use\n");
         bus_node = get_max_resource(&(resources->bus_head), 1);
 
         /* If we don't have any buses to allocate, we can't continue */
         if (!bus_node)
             return -ENOMEM;
 
         /* set Secondary bus */
         temp_byte = bus_node->base;
         dbg("set Secondary bus = %d\n", bus_node->base);
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SECONDARY_BUS, temp_byte);
         if (rc)
             return rc;
 
         /* set subordinate bus */
         temp_byte = bus_node->base + bus_node->length - 1;
         dbg("set subordinate bus = %d\n", bus_node->base + bus_node->length - 1);
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
         if (rc)
             return rc;
 
         /* set subordinate Latency Timer and base Latency Timer */
         temp_byte = 0x40;
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
         if (rc)
             return rc;
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
         if (rc)
             return rc;
 
         /* set Cache Line size */
         temp_byte = 0x08;
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
         if (rc)
             return rc;
 
         /* Setup the IO, memory, and prefetchable windows */
         io_node = get_max_resource(&(resources->io_head), 0x1000);
         if (!io_node)
             return -ENOMEM;
         mem_node = get_max_resource(&(resources->mem_head), 0x100000);
         if (!mem_node)
             return -ENOMEM;
         p_mem_node = get_max_resource(&(resources->p_mem_head), 0x100000);
         if (!p_mem_node)
             return -ENOMEM;
         dbg("Setup the IO, memory, and prefetchable windows\n");
         dbg("io_node\n");
         dbg("(base, len, next) (%x, %x, %p)\n", io_node->base,
                     io_node->length, io_node->next);
         dbg("mem_node\n");
         dbg("(base, len, next) (%x, %x, %p)\n", mem_node->base,
                     mem_node->length, mem_node->next);
         dbg("p_mem_node\n");
         dbg("(base, len, next) (%x, %x, %p)\n", p_mem_node->base,
                     p_mem_node->length, p_mem_node->next);
 
         /* set up the IRQ info */
         if (!resources->irqs) {
             irqs.barber_pole = 0;
             irqs.interrupt[0] = 0;
             irqs.interrupt[1] = 0;
             irqs.interrupt[2] = 0;
             irqs.interrupt[3] = 0;
             irqs.valid_INT = 0;
         } else {
             irqs.barber_pole = resources->irqs->barber_pole;
             irqs.interrupt[0] = resources->irqs->interrupt[0];
             irqs.interrupt[1] = resources->irqs->interrupt[1];
             irqs.interrupt[2] = resources->irqs->interrupt[2];
             irqs.interrupt[3] = resources->irqs->interrupt[3];
             irqs.valid_INT = resources->irqs->valid_INT;
         }
 
         /* set up resource lists that are now aligned on top and bottom
          * for anything behind the bridge. */
         temp_resources.bus_head = bus_node;
         temp_resources.io_head = io_node;
         temp_resources.mem_head = mem_node;
         temp_resources.p_mem_head = p_mem_node;
         temp_resources.irqs = &irqs;
 
         /* Make copies of the nodes we are going to pass down so that
          * if there is a problem,we can just use these to free resources
          */
         hold_bus_node = kmalloc(sizeof(*hold_bus_node), GFP_KERNEL);
         hold_IO_node = kmalloc(sizeof(*hold_IO_node), GFP_KERNEL);
         hold_mem_node = kmalloc(sizeof(*hold_mem_node), GFP_KERNEL);
         hold_p_mem_node = kmalloc(sizeof(*hold_p_mem_node), GFP_KERNEL);
 
         if (!hold_bus_node || !hold_IO_node || !hold_mem_node || !hold_p_mem_node) {
             kfree(hold_bus_node);
             kfree(hold_IO_node);
             kfree(hold_mem_node);
             kfree(hold_p_mem_node);
 
             return 1;
         }
 
         memcpy(hold_bus_node, bus_node, sizeof(struct pci_resource));
 
         bus_node->base += 1;
         bus_node->length -= 1;
         bus_node->next = NULL;
 
         /* If we have IO resources copy them and fill in the bridge's
          * IO range registers */
         memcpy(hold_IO_node, io_node, sizeof(struct pci_resource));
         io_node->next = NULL;
 
         /* set IO base and Limit registers */
         temp_byte = io_node->base >> 8;
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_BASE, temp_byte);
 
         temp_byte = (io_node->base + io_node->length - 1) >> 8;
         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);
 
         /* Copy the memory resources and fill in the bridge's memory
          * range registers.
          */
         memcpy(hold_mem_node, mem_node, sizeof(struct pci_resource));
         mem_node->next = NULL;
 
         /* set Mem base and Limit registers */
         temp_word = mem_node->base >> 16;
         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);
 
         temp_word = (mem_node->base + mem_node->length - 1) >> 16;
         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
 
         memcpy(hold_p_mem_node, p_mem_node, sizeof(struct pci_resource));
         p_mem_node->next = NULL;
 
         /* set Pre Mem base and Limit registers */
         temp_word = p_mem_node->base >> 16;
         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);
 
         temp_word = (p_mem_node->base + p_mem_node->length - 1) >> 16;
         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
 
         /* Adjust this to compensate for extra adjustment in first loop
          */
         irqs.barber_pole--;
 
         rc = 0;
 
         /* Here we actually find the devices and configure them */
         for (device = 0; (device <= 0x1F) && !rc; device++) {
             irqs.barber_pole = (irqs.barber_pole + 1) & 0x03;
 
             ID = 0xFFFFFFFF;
             pci_bus->number = hold_bus_node->base;
             pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0), 0x00, &ID);
             pci_bus->number = func->bus;
 
             if (!PCI_POSSIBLE_ERROR(ID)) {    /*  device present */
                 /* Setup slot structure. */
                 new_slot = cpqhp_slot_create(hold_bus_node->base);
 
                 if (new_slot == NULL) {
                     rc = -ENOMEM;
                     continue;
                 }
 
                 new_slot->bus = hold_bus_node->base;
                 new_slot->device = device;
                 new_slot->function = 0;
                 new_slot->is_a_board = 1;
                 new_slot->status = 0;
 
                 rc = configure_new_device(ctrl, new_slot, 1, &temp_resources);
                 dbg("configure_new_device rc=0x%x\n", rc);
             }   /* End of IF (device in slot?) */
         }       /* End of FOR loop */
 
         if (rc)
             goto free_and_out;
         /* save the interrupt routing information */
         if (resources->irqs) {
             resources->irqs->interrupt[0] = irqs.interrupt[0];
             resources->irqs->interrupt[1] = irqs.interrupt[1];
             resources->irqs->interrupt[2] = irqs.interrupt[2];
             resources->irqs->interrupt[3] = irqs.interrupt[3];
             resources->irqs->valid_INT = irqs.valid_INT;
         } else if (!behind_bridge) {
             /* We need to hook up the interrupts here */
             for (cloop = 0; cloop < 4; cloop++) {
                 if (irqs.valid_INT & (0x01 << cloop)) {
                     rc = cpqhp_set_irq(func->bus, func->device,
                                cloop + 1, irqs.interrupt[cloop]);
                     if (rc)
                         goto free_and_out;
                 }
             }   /* end of for loop */
         }
         /* Return unused bus resources
          * First use the temporary node to store information for
          * the board */
         if (bus_node && temp_resources.bus_head) {
             hold_bus_node->length = bus_node->base - hold_bus_node->base;
 
             hold_bus_node->next = func->bus_head;
             func->bus_head = hold_bus_node;
 
             temp_byte = temp_resources.bus_head->base - 1;
 
             /* set subordinate bus */
             rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
 
             if (temp_resources.bus_head->length == 0) {
                 kfree(temp_resources.bus_head);
                 temp_resources.bus_head = NULL;
             } else {
                 return_resource(&(resources->bus_head), temp_resources.bus_head);
             }
         }
 
         /* If we have IO space available and there is some left,
          * return the unused portion */
         if (hold_IO_node && temp_resources.io_head) {
             io_node = do_pre_bridge_resource_split(&(temp_resources.io_head),
                                    &hold_IO_node, 0x1000);
 
             /* Check if we were able to split something off */
             if (io_node) {
                 hold_IO_node->base = io_node->base + io_node->length;
 
                 temp_byte = (hold_IO_node->base) >> 8;
                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_IO_BASE, temp_byte);
 
                 return_resource(&(resources->io_head), io_node);
             }
 
             io_node = do_bridge_resource_split(&(temp_resources.io_head), 0x1000);
 
             /* Check if we were able to split something off */
             if (io_node) {
                 /* First use the temporary node to store
                  * information for the board */
                 hold_IO_node->length = io_node->base - hold_IO_node->base;
 
                 /* If we used any, add it to the board's list */
                 if (hold_IO_node->length) {
                     hold_IO_node->next = func->io_head;
                     func->io_head = hold_IO_node;
 
                     temp_byte = (io_node->base - 1) >> 8;
                     rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);
 
                     return_resource(&(resources->io_head), io_node);
                 } else {
                     /* it doesn't need any IO */
                     temp_word = 0x0000;
                     rc = pci_bus_write_config_word(pci_bus, devfn, PCI_IO_LIMIT, temp_word);
 
                     return_resource(&(resources->io_head), io_node);
                     kfree(hold_IO_node);
                 }
             } else {
                 /* it used most of the range */
                 hold_IO_node->next = func->io_head;
                 func->io_head = hold_IO_node;
             }
         } else if (hold_IO_node) {
             /* it used the whole range */
             hold_IO_node->next = func->io_head;
             func->io_head = hold_IO_node;
         }
         /* If we have memory space available and there is some left,
          * return the unused portion */
         if (hold_mem_node && temp_resources.mem_head) {
             mem_node = do_pre_bridge_resource_split(&(temp_resources.  mem_head),
                                 &hold_mem_node, 0x100000);
 
             /* Check if we were able to split something off */
             if (mem_node) {
                 hold_mem_node->base = mem_node->base + mem_node->length;
 
                 temp_word = (hold_mem_node->base) >> 16;
                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);
 
                 return_resource(&(resources->mem_head), mem_node);
             }
 
             mem_node = do_bridge_resource_split(&(temp_resources.mem_head), 0x100000);
 
             /* Check if we were able to split something off */
             if (mem_node) {
                 /* First use the temporary node to store
                  * information for the board */
                 hold_mem_node->length = mem_node->base - hold_mem_node->base;
 
                 if (hold_mem_node->length) {
                     hold_mem_node->next = func->mem_head;
                     func->mem_head = hold_mem_node;
 
                     /* configure end address */
                     temp_word = (mem_node->base - 1) >> 16;
                     rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
 
                     /* Return unused resources to the pool */
                     return_resource(&(resources->mem_head), mem_node);
                 } else {
                     /* it doesn't need any Mem */
                     temp_word = 0x0000;
                     rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
 
                     return_resource(&(resources->mem_head), mem_node);
                     kfree(hold_mem_node);
                 }
             } else {
                 /* it used most of the range */
                 hold_mem_node->next = func->mem_head;
                 func->mem_head = hold_mem_node;
             }
         } else if (hold_mem_node) {
             /* it used the whole range */
             hold_mem_node->next = func->mem_head;
             func->mem_head = hold_mem_node;
         }
         /* If we have prefetchable memory space available and there
          * is some left at the end, return the unused portion */
         if (temp_resources.p_mem_head) {
             p_mem_node = do_pre_bridge_resource_split(&(temp_resources.p_mem_head),
                                   &hold_p_mem_node, 0x100000);
 
             /* Check if we were able to split something off */
             if (p_mem_node) {
                 hold_p_mem_node->base = p_mem_node->base + p_mem_node->length;
 
                 temp_word = (hold_p_mem_node->base) >> 16;
                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);
 
                 return_resource(&(resources->p_mem_head), p_mem_node);
             }
 
             p_mem_node = do_bridge_resource_split(&(temp_resources.p_mem_head), 0x100000);
 
             /* Check if we were able to split something off */
             if (p_mem_node) {
                 /* First use the temporary node to store
                  * information for the board */
                 hold_p_mem_node->length = p_mem_node->base - hold_p_mem_node->base;
 
                 /* If we used any, add it to the board's list */
                 if (hold_p_mem_node->length) {
                     hold_p_mem_node->next = func->p_mem_head;
                     func->p_mem_head = hold_p_mem_node;
 
                     temp_word = (p_mem_node->base - 1) >> 16;
                     rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
 
                     return_resource(&(resources->p_mem_head), p_mem_node);
                 } else {
                     /* it doesn't need any PMem */
                     temp_word = 0x0000;
                     rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
 
                     return_resource(&(resources->p_mem_head), p_mem_node);
                     kfree(hold_p_mem_node);
                 }
             } else {
                 /* it used the most of the range */
                 hold_p_mem_node->next = func->p_mem_head;
                 func->p_mem_head = hold_p_mem_node;
             }
         } else if (hold_p_mem_node) {
             /* it used the whole range */
             hold_p_mem_node->next = func->p_mem_head;
             func->p_mem_head = hold_p_mem_node;
         }
         /* We should be configuring an IRQ and the bridge's base address
          * registers if it needs them.  Although we have never seen such
          * a device */
 
         /* enable card */
         command = 0x0157;   /* = PCI_COMMAND_IO |
                      *   PCI_COMMAND_MEMORY |
                      *   PCI_COMMAND_MASTER |
                      *   PCI_COMMAND_INVALIDATE |
                      *   PCI_COMMAND_PARITY |
                      *   PCI_COMMAND_SERR */
         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
 
         /* set Bridge Control Register */
         command = 0x07;     /* = PCI_BRIDGE_CTL_PARITY |
                      *   PCI_BRIDGE_CTL_SERR |
                      *   PCI_BRIDGE_CTL_NO_ISA */
         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, command);
     } else if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
         /* Standard device */
         rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
 
         if (class_code == PCI_BASE_CLASS_DISPLAY) {
             /* Display (video) adapter (not supported) */
             return DEVICE_TYPE_NOT_SUPPORTED;
         }
         /* Figure out IO and memory needs */
         for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
             temp_register = 0xFFFFFFFF;
 
             dbg("CND: bus=%d, devfn=%d, offset=%d\n", pci_bus->number, devfn, cloop);
             rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, temp_register);
 
             rc = pci_bus_read_config_dword(pci_bus, devfn, cloop, &temp_register);
             dbg("CND: base = 0x%x\n", temp_register);
 
             if (temp_register) {      /* If this register is implemented */
                 if ((temp_register & 0x03L) == 0x01) {
                     /* Map IO */
 
                     /* set base = amount of IO space */
                     base = temp_register & 0xFFFFFFFC;
                     base = ~base + 1;
 
                     dbg("CND:      length = 0x%x\n", base);
                     io_node = get_io_resource(&(resources->io_head), base);
                     if (!io_node)
                         return -ENOMEM;
                     dbg("Got io_node start = %8.8x, length = %8.8x next (%p)\n",
                         io_node->base, io_node->length, io_node->next);
                     dbg("func (%p) io_head (%p)\n", func, func->io_head);
 
                     /* allocate the resource to the board */
                     base = io_node->base;
                     io_node->next = func->io_head;
                     func->io_head = io_node;
                 } else if ((temp_register & 0x0BL) == 0x08) {
                     /* Map prefetchable memory */
                     base = temp_register & 0xFFFFFFF0;
                     base = ~base + 1;
 
                     dbg("CND:      length = 0x%x\n", base);
                     p_mem_node = get_resource(&(resources->p_mem_head), base);
 
                     /* allocate the resource to the board */
                     if (p_mem_node) {
                         base = p_mem_node->base;
 
                         p_mem_node->next = func->p_mem_head;
                         func->p_mem_head = p_mem_node;
                     } else
                         return -ENOMEM;
                 } else if ((temp_register & 0x0BL) == 0x00) {
                     /* Map memory */
                     base = temp_register & 0xFFFFFFF0;
                     base = ~base + 1;
 
                     dbg("CND:      length = 0x%x\n", base);
                     mem_node = get_resource(&(resources->mem_head), base);
 
                     /* allocate the resource to the board */
                     if (mem_node) {
                         base = mem_node->base;
 
                         mem_node->next = func->mem_head;
                         func->mem_head = mem_node;
                     } else
                         return -ENOMEM;
                 } else {
                     /* Reserved bits or requesting space below 1M */
                     return NOT_ENOUGH_RESOURCES;
                 }
 
                 rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);
 
                 /* Check for 64-bit base */
                 if ((temp_register & 0x07L) == 0x04) {
                     cloop += 4;
 
                     /* Upper 32 bits of address always zero
                      * on today's systems */
                     /* FIXME this is probably not true on
                      * Alpha and ia64??? */
                     base = 0;
                     rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);
                 }
             }
         }       /* End of base register loop */
         if (cpqhp_legacy_mode) {
             /* Figure out which interrupt pin this function uses */
             rc = pci_bus_read_config_byte(pci_bus, devfn,
                 PCI_INTERRUPT_PIN, &temp_byte);
 
             /* If this function needs an interrupt and we are behind
              * a bridge and the pin is tied to something that's
              * already mapped, set this one the same */
             if (temp_byte && resources->irqs &&
                 (resources->irqs->valid_INT &
                  (0x01 << ((temp_byte + resources->irqs->barber_pole - 1) & 0x03)))) {
                 /* We have to share with something already set up */
                 IRQ = resources->irqs->interrupt[(temp_byte +
                     resources->irqs->barber_pole - 1) & 0x03];
             } else {
                 /* Program IRQ based on card type */
                 rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
 
                 if (class_code == PCI_BASE_CLASS_STORAGE)
                     IRQ = cpqhp_disk_irq;
                 else
                     IRQ = cpqhp_nic_irq;
             }
 
             /* IRQ Line */
             rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_INTERRUPT_LINE, IRQ);
         }
 
         if (!behind_bridge) {
             rc = cpqhp_set_irq(func->bus, func->device, temp_byte, IRQ);
             if (rc)
                 return 1;
         } else {
             /* TBD - this code may also belong in the other clause
              * of this If statement */
             resources->irqs->interrupt[(temp_byte + resources->irqs->barber_pole - 1) & 0x03] = IRQ;
             resources->irqs->valid_INT |= 0x01 << (temp_byte + resources->irqs->barber_pole - 1) & 0x03;
         }
 
         /* Latency Timer */
         temp_byte = 0x40;
         rc = pci_bus_write_config_byte(pci_bus, devfn,
                     PCI_LATENCY_TIMER, temp_byte);
 
         /* Cache Line size */
         temp_byte = 0x08;
         rc = pci_bus_write_config_byte(pci_bus, devfn,
                     PCI_CACHE_LINE_SIZE, temp_byte);
 
         /* disable ROM base Address */
         temp_dword = 0x00L;
         rc = pci_bus_write_config_word(pci_bus, devfn,
                     PCI_ROM_ADDRESS, temp_dword);
 
         /* enable card */
         temp_word = 0x0157; /* = PCI_COMMAND_IO |
                      *   PCI_COMMAND_MEMORY |
                      *   PCI_COMMAND_MASTER |
                      *   PCI_COMMAND_INVALIDATE |
                      *   PCI_COMMAND_PARITY |
                      *   PCI_COMMAND_SERR */
         rc = pci_bus_write_config_word(pci_bus, devfn,
                     PCI_COMMAND, temp_word);
     } else {        /* End of Not-A-Bridge else */
         /* It's some strange type of PCI adapter (Cardbus?) */
         return DEVICE_TYPE_NOT_SUPPORTED;
     }
 
     func->configured = 1;
 
     return 0;
 free_and_out:
     cpqhp_destroy_resource_list(&temp_resources);
 
     return_resource(&(resources->bus_head), hold_bus_node);
     return_resource(&(resources->io_head), hold_IO_node);
     return_resource(&(resources->mem_head), hold_mem_node);
     return_resource(&(resources->p_mem_head), hold_p_mem_node);
     return rc;
 }