text: // 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
   * 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;
  	u32 temp_dword;
  
  
  	misc = readw(ctrl->hpc_reg + MISC);
  	/*
  	 * Check to see if it was our interrupt
  	 */
  	if (!(misc & 0x000C))
  		return IRQ_NONE;
  
  	if (misc & 0x0004) {
  		/*
  		 * Serial Output interrupt Pending
  		 */
  
  		/* Clear the interrupt */
  		misc |= 0x0004;
  		writew(misc, ctrl->hpc_reg + MISC);
  
  		/* Read to clear posted writes */
  		misc = readw(ctrl->hpc_reg + MISC);
  
  		dbg("%s - waking up\n", __func__);
  		wake_up_interruptible(&ctrl->queue);
  	}
  
  	if (misc & 0x0008) {
  		/* General-interrupt-input interrupt Pending */
  		Diff = readl(ctrl->hpc_reg + INT_INPUT_CLEAR) ^ ctrl->ctrl_int_comp;
  
  		ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
  
  		/* Clear the interrupt */
  		writel(Diff, ctrl->hpc_reg + INT_INPUT_CLEAR);
  
  		/* Read it back to clear any posted writes */
  		temp_dword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
  
  		if (!Diff)
  			/* Clear all interrupts */
  			writel(0xFFFFFFFF, ctrl->hpc_reg + INT_INPUT_CLEAR);
  
  		schedule_flag += handle_switch_change((u8)(Diff & 0xFFL), ctrl);
  		schedule_flag += handle_presence_change((u16)((Diff & 0xFFFF0000L) >> 16), ctrl);
  		schedule_flag += handle_power_fault((u8)((Diff & 0xFF00L) >> 8), ctrl);
  	}
  
  	reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
  	if (reset & 0x40) {
  		/* Bus reset has completed */
  		reset &= 0xCF;
  		writeb(reset, ctrl->hpc_reg + RESET_FREQ_MODE);
  		reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
  		wake_up_interruptible(&ctrl->queue);
  	}
  
  	if (schedule_flag) {
  		wake_up_process(cpqhp_event_thread);
  		dbg("Waking even thread");
  	}
  	return IRQ_HANDLED;
  }
  
  
  /**
   * cpqhp_slot_create - Creates a node and adds it to the proper bus.
   * @busnumber: bus where new node is to be located
   *
   * Returns pointer to the new node or %NULL if unsuccessful.
   */
  struct pci_func *cpqhp_slot_create(u8 busnumber)
  {
  	struct pci_func *new_slot;
  	struct pci_func *next;
  
  	new_slot = kzalloc(sizeof(*new_slot), GFP_KERNEL);
  	if (new_slot == NULL)
  		return new_slot;
  
  	new_slot->next = NULL;
  	new_slot->configured = 1;
  
  	if (cpqhp_slot_list[busnumber] == NULL) {
  		cpqhp_slot_list[busnumber] = new_slot;
  	} else {
  		next = cpqhp_slot_list[busnumber];
  		while (next->next != NULL)
  			next = next->next;
  		next->next = new_slot;
  	}
  	return new_slot;
  }
  
  
  /**
   * slot_remove - Removes a node from the linked list of slots.
   * @old_slot: slot to remove
   *
   * Returns %0 if successful, !0 otherwise.
   */
  static int slot_remove(struct pci_func *old_slot)
  {
  	struct pci_func *next;
  
  	if (old_slot == NULL)
  		return 1;
  
  	next = cpqhp_slot_list[old_slot->bus];
  	if (next == NULL)
  		return 1;
  
  	if (next == old_slot) {
  		cpqhp_slot_list[old_slot->bus] = old_slot->next;
  		cpqhp_destroy_board_resources(old_slot);
  		kfree(old_slot);
  		return 0;
  	}
  
  	while ((next->next != old_slot) && (next->next != NULL))
  		next = next->next;
  
  	if (next->next == old_slot) {
  		next->next = old_slot->next;
  		cpqhp_destroy_board_resources(old_slot);
  		kfree(old_slot);
  		return 0;
  	} else
  		return 2;
  }
  
  
  /**
   * bridge_slot_remove - Removes a node from the linked list of slots.
   * @bridge: bridge to remove
   *
   * Returns %0 if successful, !0 otherwise.
   */
  static int bridge_slot_remove(struct pci_func *bridge)
  {
  	u8 subordinateBus, secondaryBus;
  	u8 tempBus;
  	struct pci_func *next;
  
  	secondaryBus = (bridge->config_space[0x06] >> 8) & 0xFF;
  	subordinateBus = (bridge->config_space[0x06] >> 16) & 0xFF;
  
  	for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
  		next = cpqhp_slot_list[tempBus];
  
  		while (!slot_remove(next))
  			next = cpqhp_slot_list[tempBus];
  	}
  
  	next = cpqhp_slot_list[bridge->bus];
  
  	if (next == NULL)
  		return 1;
  
  	if (next == bridge) {
  		cpqhp_slot_list[bridge->bus] = bridge->next;
  		goto out;
  	}
  
  	while ((next->next != bridge) && (next->next != NULL))
  		next = next->next;
  
  	if (next->next != bridge)
  		return 2;
  	next->next = bridge->next;
  out:
  	kfree(bridge);
  	return 0;
  }
  
  
  /**
   * cpqhp_slot_find - Looks for a node by bus, and device, multiple functions accessed
   * @bus: bus to find
   * @device: device to find
   * @index: is %0 for first function found, %1 for the second...
   *
   * Returns pointer to the node if successful, %NULL otherwise.
   */
  struct pci_func *cpqhp_slot_find(u8 bus, u8 device, u8 index)
  {
  	int found = -1;
  	struct pci_func *func;
  
  	func = cpqhp_slot_list[bus];
  
  	if ((func == NULL) || ((func->device == device) && (index == 0)))
  		return func;
  
  	if (func->device == device)
  		found++;
  
  	while (func->next != NULL) {
  		func = func->next;
  
  		if (func->device == device)
  			found++;
  
  		if (found == index)
  			return func;
  	}
  
  	return NULL;
  }
  
  
  /* DJZ: I don't think is_bridge will work as is.
   * FIXME */
  static int is_bridge(struct pci_func *func)
  {
  	/* Check the header type */
  	if (((func->config_space[0x03] >> 16) & 0xFF) == 0x01)
  		return 1;
  	else
  		return 0;
  }
  
  
  /**
   * set_controller_speed - set the frequency and/or mode of a specific controller segment.
   * @ctrl: controller to change frequency/mode for.
   * @adapter_speed: the speed of the adapter we want to match.
   * @hp_slot: the slot number where the adapter is installed.
   *
   * Returns %0 if we successfully change frequency and/or mode to match the
   * adapter speed.
   */
  static u8 set_controller_speed(struct controller *ctrl, u8 adapter_speed, u8 hp_slot)
  {
  	struct slot *slot;
  	struct pci_bus *bus = ctrl->pci_bus;
  	u8 reg;
  	u8 slot_power = readb(ctrl->hpc_reg + SLOT_POWER);
  	u16 reg16;
  	u32 leds = readl(ctrl->hpc_reg + LED_CONTROL);
  
  	if (bus->cur_bus_speed == adapter_speed)
  		return 0;
  
  	/* We don't allow freq/mode changes if we find another adapter running
  	 * in another slot on this controller
  	 */
  	for (slot = ctrl->slot; slot; slot = slot->next) {
  		if (slot->device == (hp_slot + ctrl->slot_device_offset))
  			continue;
  		if (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);
  
  	/* Reenable interrupts */
  	writel(0, ctrl->hpc_reg + INT_MASK);
  
  	pci_write_config_byte(ctrl->pci_dev, 0x41, reg);
  
  	/* Restart state machine */
  	reg = ~0xF;
  	pci_read_config_byte(ctrl->pci_dev, 0x43, &reg);
  	pci_write_config_byte(ctrl->pci_dev, 0x43, reg);
  
  	/* Only if mode change...*/
  	if (((bus->cur_bus_speed == PCI_SPEED_66MHz) && (adapter_speed == PCI_SPEED_66MHz_PCIX)) ||
  		((bus->cur_bus_speed == PCI_SPEED_66MHz_PCIX) && (adapter_speed == PCI_SPEED_66MHz)))
  			set_SOGO(ctrl);
  
  	wait_for_ctrl_irq(ctrl);
  	mdelay(1100);
  
  	/* Restore LED/Slot state */
  	writel(leds, ctrl->hpc_reg + LED_CONTROL);
  	writeb(slot_power, ctrl->hpc_reg + SLOT_ENABLE);
  
  	set_SOGO(ctrl);
  	wait_for_ctrl_irq(ctrl);
  
  	bus->cur_bus_speed = adapter_speed;
  	slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  
  	info("Successfully changed frequency/mode for adapter in slot %d\n",
  			slot->number);
  	return 0;
  }
  
  /* the following routines constitute the bulk of the
   * hotplug controller logic
   */
  
  
  /**
   * board_replaced - Called after a board has been replaced in the system.
   * @func: PCI device/function information
   * @ctrl: hotplug controller
   *
   * This is only used if we don't have resources for hot add.
   * Turns power on for the board.
   * Checks to see if board is the same.
   * If board is same, reconfigures it.
   * If board isn't same, turns it back off.
   */
  static u32 board_replaced(struct pci_func *func, struct controller *ctrl)
  {
  	struct pci_bus *bus = ctrl->pci_bus;
  	u8 hp_slot;
  	u8 temp_byte;
  	u8 adapter_speed;
  	u32 rc = 0;
  
  	hp_slot = func->device - ctrl->slot_device_offset;
  
  	/*
  	 * The switch is open.
  	 */
  	if (readl(ctrl->hpc_reg + INT_INPUT_CLEAR) & (0x01L << hp_slot))
  		rc = INTERLOCK_OPEN;
  	/*
  	 * The board is already on
  	 */
  	else if (is_slot_enabled(ctrl, hp_slot))
  		rc = CARD_FUNCTIONING;
  	else {
  		mutex_lock(&ctrl->crit_sect);
  
  		/* turn on board without attaching to the bus */
  		enable_slot_power(ctrl, hp_slot);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  
  		/* Change bits in slot power register to force another shift out
  		 * NOTE: this is to work around the timer bug */
  		temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
  		writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
  		writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  
  		adapter_speed = get_adapter_speed(ctrl, hp_slot);
  		if (bus->cur_bus_speed != adapter_speed)
  			if (set_controller_speed(ctrl, adapter_speed, hp_slot))
  				rc = WRONG_BUS_FREQUENCY;
  
  		/* turn off board without attaching to the bus */
  		disable_slot_power(ctrl, hp_slot);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  
  		mutex_unlock(&ctrl->crit_sect);
  
  		if (rc)
  			return rc;
  
  		mutex_lock(&ctrl->crit_sect);
  
  		slot_enable(ctrl, hp_slot);
  		green_LED_blink(ctrl, hp_slot);
  
  		amber_LED_off(ctrl, hp_slot);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  
  		mutex_unlock(&ctrl->crit_sect);
  
  		/* Wait for ~1 second because of hot plug spec */
  		long_delay(1*HZ);
  
  		/* Check for a power fault */
  		if (func->status == 0xFF) {
  			/* power fault occurred, but it was benign */
  			rc = POWER_FAILURE;
  			func->status = 0;
  		} else
  			rc = cpqhp_valid_replace(ctrl, func);
  
  		if (!rc) {
  			/* It must be the same board */
  
  			rc = cpqhp_configure_board(ctrl, func);
  
  			/* If configuration fails, turn it off
  			 * Get slot won't work for devices behind
  			 * bridges, but in this case it will always be
  			 * called for the "base" bus/dev/func of an
  			 * adapter.
  			 */
  
  			mutex_lock(&ctrl->crit_sect);
  
  			amber_LED_on(ctrl, hp_slot);
  			green_LED_off(ctrl, hp_slot);
  			slot_disable(ctrl, hp_slot);
  
  			set_SOGO(ctrl);
  
  			/* Wait for SOBS to be unset */
  			wait_for_ctrl_irq(ctrl);
  
  			mutex_unlock(&ctrl->crit_sect);
  
  			if (rc)
  				return rc;
  			else
  				return 1;
  
  		} else {
  			/* Something is wrong
  
  			 * Get slot won't work for devices behind bridges, but
  			 * in this case it will always be called for the "base"
  			 * bus/dev/func of an adapter.
  			 */
  
  			mutex_lock(&ctrl->crit_sect);
  
  			amber_LED_on(ctrl, hp_slot);
  			green_LED_off(ctrl, hp_slot);
  			slot_disable(ctrl, hp_slot);
  
  			set_SOGO(ctrl);
  
  			/* Wait for SOBS to be unset */
  			wait_for_ctrl_irq(ctrl);
  
  			mutex_unlock(&ctrl->crit_sect);
  		}
  
  	}
  	return rc;
  
  }
  
  
  /**
   * board_added - Called after a board has been added to the system.
   * @func: PCI device/function info
   * @ctrl: hotplug controller
   *
   * Turns power on for the board.
   * Configures board.
   */
  static u32 board_added(struct pci_func *func, struct controller *ctrl)
  {
  	u8 hp_slot;
  	u8 temp_byte;
  	u8 adapter_speed;
  	int index;
  	u32 temp_register = 0xFFFFFFFF;
  	u32 rc = 0;
  	struct pci_func *new_slot = NULL;
  	struct pci_bus *bus = ctrl->pci_bus;
  	struct slot *p_slot;
  	struct resource_lists res_lists;
  
  	hp_slot = func->device - ctrl->slot_device_offset;
  	dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n",
  	    __func__, func->device, ctrl->slot_device_offset, hp_slot);
  
  	mutex_lock(&ctrl->crit_sect);
  
  	/* turn on board without attaching to the bus */
  	enable_slot_power(ctrl, hp_slot);
  
  	set_SOGO(ctrl);
  
  	/* Wait for SOBS to be unset */
  	wait_for_ctrl_irq(ctrl);
  
  	/* Change bits in slot power register to force another shift out
  	 * NOTE: this is to work around the timer bug
  	 */
  	temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
  	writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
  	writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);
  
  	set_SOGO(ctrl);
  
  	/* Wait for SOBS to be unset */
  	wait_for_ctrl_irq(ctrl);
  
  	adapter_speed = get_adapter_speed(ctrl, hp_slot);
  	if (bus->cur_bus_speed != adapter_speed)
  		if (set_controller_speed(ctrl, adapter_speed, hp_slot))
  			rc = WRONG_BUS_FREQUENCY;
  
  	/* turn off board without attaching to the bus */
  	disable_slot_power(ctrl, hp_slot);
  
  	set_SOGO(ctrl);
  
  	/* Wait for SOBS to be unset */
  	wait_for_ctrl_irq(ctrl);
  
  	mutex_unlock(&ctrl->crit_sect);
  
  	if (rc)
  		return rc;
  
  	p_slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  
  	/* turn on board and blink green LED */
  
  	dbg("%s: before down\n", __func__);
  	mutex_lock(&ctrl->crit_sect);
  	dbg("%s: after down\n", __func__);
  
  	dbg("%s: before slot_enable\n", __func__);
  	slot_enable(ctrl, hp_slot);
  
  	dbg("%s: before green_LED_blink\n", __func__);
  	green_LED_blink(ctrl, hp_slot);
  
  	dbg("%s: before amber_LED_blink\n", __func__);
  	amber_LED_off(ctrl, hp_slot);
  
  	dbg("%s: before set_SOGO\n", __func__);
  	set_SOGO(ctrl);
  
  	/* Wait for SOBS to be unset */
  	dbg("%s: before wait_for_ctrl_irq\n", __func__);
  	wait_for_ctrl_irq(ctrl);
  	dbg("%s: after wait_for_ctrl_irq\n", __func__);
  
  	dbg("%s: before up\n", __func__);
  	mutex_unlock(&ctrl->crit_sect);
  	dbg("%s: after up\n", __func__);
  
  	/* Wait for ~1 second because of hot plug spec */
  	dbg("%s: before long_delay\n", __func__);
  	long_delay(1*HZ);
  	dbg("%s: after long_delay\n", __func__);
  
  	dbg("%s: func status = %x\n", __func__, func->status);
  	/* Check for a power fault */
  	if (func->status == 0xFF) {
  		/* power fault occurred, but it was benign */
  		temp_register = 0xFFFFFFFF;
  		dbg("%s: temp register set to %x by power fault\n", __func__, temp_register);
  		rc = POWER_FAILURE;
  		func->status = 0;
  	} else {
  		/* Get vendor/device ID u32 */
  		ctrl->pci_bus->number = func->bus;
  		rc = pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, func->function), PCI_VENDOR_ID, &temp_register);
  		dbg("%s: pci_read_config_dword returns %d\n", __func__, rc);
  		dbg("%s: temp_register is %x\n", __func__, temp_register);
  
  		if (rc != 0) {
  			/* Something's wrong here */
  			temp_register = 0xFFFFFFFF;
  			dbg("%s: temp register set to %x by error\n", __func__, temp_register);
  		}
  		/* Preset return code.  It will be changed later if things go okay. */
  		rc = NO_ADAPTER_PRESENT;
  	}
  
  	/* All F's is an empty slot or an invalid board */
  	if (temp_register != 0xFFFFFFFF) {
  		res_lists.io_head = ctrl->io_head;
  		res_lists.mem_head = ctrl->mem_head;
  		res_lists.p_mem_head = ctrl->p_mem_head;
  		res_lists.bus_head = ctrl->bus_head;
  		res_lists.irqs = NULL;
  
  		rc = configure_new_device(ctrl, func, 0, &res_lists);
  
  		dbg("%s: back from configure_new_device\n", __func__);
  		ctrl->io_head = res_lists.io_head;
  		ctrl->mem_head = res_lists.mem_head;
  		ctrl->p_mem_head = res_lists.p_mem_head;
  		ctrl->bus_head = res_lists.bus_head;
  
  		cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
  		cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
  		cpqhp_resource_sort_and_combine(&(ctrl->io_head));
  		cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
  
  		if (rc) {
  			mutex_lock(&ctrl->crit_sect);
  
  			amber_LED_on(ctrl, hp_slot);
  			green_LED_off(ctrl, hp_slot);
  			slot_disable(ctrl, hp_slot);
  
  			set_SOGO(ctrl);
  
  			/* Wait for SOBS to be unset */
  			wait_for_ctrl_irq(ctrl);
  
  			mutex_unlock(&ctrl->crit_sect);
  			return rc;
  		} else {
  			cpqhp_save_slot_config(ctrl, func);
  		}
  
  
  		func->status = 0;
  		func->switch_save = 0x10;
  		func->is_a_board = 0x01;
  
  		/* next, we will instantiate the linux pci_dev structures (with
  		 * appropriate driver notification, if already present) */
  		dbg("%s: configure linux pci_dev structure\n", __func__);
  		index = 0;
  		do {
  			new_slot = cpqhp_slot_find(ctrl->bus, func->device, index++);
  			if (new_slot && !new_slot->pci_dev)
  				cpqhp_configure_device(ctrl, new_slot);
  		} while (new_slot);
  
  		mutex_lock(&ctrl->crit_sect);
  
  		green_LED_on(ctrl, hp_slot);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  
  		mutex_unlock(&ctrl->crit_sect);
  	} else {
  		mutex_lock(&ctrl->crit_sect);
  
  		amber_LED_on(ctrl, hp_slot);
  		green_LED_off(ctrl, hp_slot);
  		slot_disable(ctrl, hp_slot);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  
  		mutex_unlock(&ctrl->crit_sect);
  
  		return rc;
  	}
  	return 0;
  }
  
  
  /**
   * remove_board - Turns off slot and LEDs
   * @func: PCI device/function info
   * @replace_flag: whether replacing or adding a new device
   * @ctrl: target controller
   */
  static u32 remove_board(struct pci_func *func, u32 replace_flag, struct controller *ctrl)
  {
  	int index;
  	u8 skip = 0;
  	u8 device;
  	u8 hp_slot;
  	u8 temp_byte;
  	u32 rc;
  	struct resource_lists res_lists;
  	struct pci_func *temp_func;
  
  	if (cpqhp_unconfigure_device(func))
  		return 1;
  
  	device = func->device;
  
  	hp_slot = func->device - ctrl->slot_device_offset;
  	dbg("In %s, hp_slot = %d\n", __func__, hp_slot);
  
  	/* When we get here, it is safe to change base address registers.
  	 * We will attempt to save the base address register lengths */
  	if (replace_flag || !ctrl->add_support)
  		rc = cpqhp_save_base_addr_length(ctrl, func);
  	else if (!func->bus_head && !func->mem_head &&
  		 !func->p_mem_head && !func->io_head) {
  		/* Here we check to see if we've saved any of the board's
  		 * resources already.  If so, we'll skip the attempt to
  		 * determine what's being used. */
  		index = 0;
  		temp_func = cpqhp_slot_find(func->bus, func->device, index++);
  		while (temp_func) {
  			if (temp_func->bus_head || temp_func->mem_head
  			    || temp_func->p_mem_head || temp_func->io_head) {
  				skip = 1;
  				break;
  			}
  			temp_func = cpqhp_slot_find(temp_func->bus, temp_func->device, index++);
  		}
  
  		if (!skip)
  			rc = cpqhp_save_used_resources(ctrl, func);
  	}
  	/* Change status to shutdown */
  	if (func->is_a_board)
  		func->status = 0x01;
  	func->configured = 0;
  
  	mutex_lock(&ctrl->crit_sect);
  
  	green_LED_off(ctrl, hp_slot);
  	slot_disable(ctrl, hp_slot);
  
  	set_SOGO(ctrl);
  
  	/* turn off SERR for slot */
  	temp_byte = readb(ctrl->hpc_reg + SLOT_SERR);
  	temp_byte &= ~(0x01 << hp_slot);
  	writeb(temp_byte, ctrl->hpc_reg + SLOT_SERR);
  
  	/* Wait for SOBS to be unset */
  	wait_for_ctrl_irq(ctrl);
  
  	mutex_unlock(&ctrl->crit_sect);
  
  	if (!replace_flag && ctrl->add_support) {
  		while (func) {
  			res_lists.io_head = ctrl->io_head;
  			res_lists.mem_head = ctrl->mem_head;
  			res_lists.p_mem_head = ctrl->p_mem_head;
  			res_lists.bus_head = ctrl->bus_head;
  
  			cpqhp_return_board_resources(func, &res_lists);
  
  			ctrl->io_head = res_lists.io_head;
  			ctrl->mem_head = res_lists.mem_head;
  			ctrl->p_mem_head = res_lists.p_mem_head;
  			ctrl->bus_head = res_lists.bus_head;
  
  			cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
  			cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
  			cpqhp_resource_sort_and_combine(&(ctrl->io_head));
  			cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
  
  			if (is_bridge(func)) {
  				bridge_slot_remove(func);
  			} else
  				slot_remove(func);
  
  			func = cpqhp_slot_find(ctrl->bus, device, 0);
  		}
  
  		/* Setup slot structure with entry for empty slot */
  		func = cpqhp_slot_create(ctrl->bus);
  
  		if (func == NULL)
  			return 1;
  
  		func->bus = ctrl->bus;
  		func->device = device;
  		func->function = 0;
  		func->configured = 0;
  		func->switch_save = 0x10;
  		func->is_a_board = 0;
  		func->p_task_event = NULL;
  	}
  
  	return 0;
  }
  
  static void pushbutton_helper_thread(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 = 0;
  	int change = 1;
  	struct pci_func *func;
  	u8 hp_slot;
  	struct slot *p_slot;
  
  	while (change) {
  		change = 0;
  
  		for (loop = 0; loop < 10; loop++) {
  			/* dbg("loop %d\n", loop); */
  			if (ctrl->event_queue[loop].event_type != 0) {
  				hp_slot = ctrl->event_queue[loop].hp_slot;
  
  				func = cpqhp_slot_find(ctrl->bus, (hp_slot + ctrl->slot_device_offset), 0);
  				if (!func)
  					return;
  
  				p_slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  				if (!p_slot)
  					return;
  
  				dbg("hp_slot %d, func %p, p_slot %p\n",
  				    hp_slot, func, p_slot);
  
  				if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
  					dbg("button pressed\n");
  				} else if (ctrl->event_queue[loop].event_type ==
  					   INT_BUTTON_CANCEL) {
  					dbg("button cancel\n");
  					del_timer(&p_slot->task_event);
  
  					mutex_lock(&ctrl->crit_sect);
  
  					if (p_slot->state == BLINKINGOFF_STATE) {
  						/* slot is on */
  						dbg("turn on green LED\n");
  						green_LED_on(ctrl, hp_slot);
  					} else if (p_slot->state == BLINKINGON_STATE) {
  						/* slot is off */
  						dbg("turn off green LED\n");
  						green_LED_off(ctrl, hp_slot);
  					}
  
  					info(msg_button_cancel, p_slot->number);
  
  					p_slot->state = STATIC_STATE;
  
  					amber_LED_off(ctrl, hp_slot);
  
  					set_SOGO(ctrl);
  
  					/* Wait for SOBS to be unset */
  					wait_for_ctrl_irq(ctrl);
  
  					mutex_unlock(&ctrl->crit_sect);
  				}
  				/*** button Released (No action on press...) */
  				else if (ctrl->event_queue[loop].event_type == INT_BUTTON_RELEASE) {
  					dbg("button release\n");
  
  					if (is_slot_enabled(ctrl, hp_slot)) {
  						dbg("slot is on\n");
  						p_slot->state = BLINKINGOFF_STATE;
  						info(msg_button_off, p_slot->number);
  					} else {
  						dbg("slot is off\n");
  						p_slot->state = BLINKINGON_STATE;
  						info(msg_button_on, p_slot->number);
  					}
  					mutex_lock(&ctrl->crit_sect);
  
  					dbg("blink green LED and turn off amber\n");
  
  					amber_LED_off(ctrl, hp_slot);
  					green_LED_blink(ctrl, hp_slot);
  
  					set_SOGO(ctrl);
  
  					/* Wait for SOBS to be unset */
  					wait_for_ctrl_irq(ctrl);
  
  					mutex_unlock(&ctrl->crit_sect);
  					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 */
  	}
  
  	return;
  }
  
  
  /**
   * cpqhp_pushbutton_thread - handle pushbutton events
   * @slot: target slot (struct)
   *
   * Scheduled procedure to handle blocking stuff for the pushbuttons.
   * Handles all pending events and exits.
   */
  void cpqhp_pushbutton_thread(struct timer_list *t)
  {
  	u8 hp_slot;
  	u8 device;
  	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;
  
  	device = p_slot->device;
  
  	if (is_slot_enabled(ctrl, hp_slot)) {
  		p_slot->state = POWEROFF_STATE;
  		/* power Down board */
  		func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
  		dbg("In power_down_board, func = %p, ctrl = %p\n", func, ctrl);
  		if (!func) {
  			dbg("Error! func NULL in %s\n", __func__);
  			return;
  		}
  
  		if (cpqhp_process_SS(ctrl, func) != 0) {
  			amber_LED_on(ctrl, hp_slot);
  			green_LED_on(ctrl, hp_slot);
  
  			set_SOGO(ctrl);
  
  			/* Wait for SOBS to be unset */
  			wait_for_ctrl_irq(ctrl);
  		}
  
  		p_slot->state = STATIC_STATE;
  	} else {
  		p_slot->state = POWERON_STATE;
  		/* slot is off */
  
  		func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
  		dbg("In add_board, func = %p, ctrl = %p\n", func, ctrl);
  		if (!func) {
  			dbg("Error! func NULL in %s\n", __func__);
  			return;
  		}
  
  		if (ctrl != NULL) {
  			if (cpqhp_process_SI(ctrl, func) != 0) {
  				amber_LED_on(ctrl, hp_slot);
  				green_LED_off(ctrl, hp_slot);
  
  				set_SOGO(ctrl);
  
  				/* Wait for SOBS to be unset */
  				wait_for_ctrl_irq(ctrl);
  			}
  		}
  
  		p_slot->state = STATIC_STATE;
  	}
  
  	return;
  }
  
  
  int cpqhp_process_SI(struct controller *ctrl, struct pci_func *func)
  {
  	u8 device, hp_slot;
  	u16 temp_word;
  	u32 tempdword;
  	int rc;
  	struct slot *p_slot;
  	int physical_slot = 0;
  
  	tempdword = 0;
  
  	device = func->device;
  	hp_slot = device - ctrl->slot_device_offset;
  	p_slot = cpqhp_find_slot(ctrl, device);
  	if (p_slot)
  		physical_slot = p_slot->number;
  
  	/* Check to see if the interlock is closed */
  	tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
  
  	if (tempdword & (0x01 << hp_slot))
  		return 1;
  
  	if (func->is_a_board) {
  		rc = board_replaced(func, ctrl);
  	} else {
  		/* add board */
  		slot_remove(func);
  
  		func = cpqhp_slot_create(ctrl->bus);
  		if (func == NULL)
  			return 1;
  
  		func->bus = ctrl->bus;
  		func->device = device;
  		func->function = 0;
  		func->configured = 0;
  		func->is_a_board = 1;
  
  		/* We have to save the presence info for these slots */
  		temp_word = ctrl->ctrl_int_comp >> 16;
  		func->presence_save = (temp_word >> hp_slot) & 0x01;
  		func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
  
  		if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
  			func->switch_save = 0;
  		} else {
  			func->switch_save = 0x10;
  		}
  
  		rc = board_added(func, ctrl);
  		if (rc) {
  			if (is_bridge(func)) {
  				bridge_slot_remove(func);
  			} else
  				slot_remove(func);
  
  			/* Setup slot structure with entry for empty slot */
  			func = cpqhp_slot_create(ctrl->bus);
  
  			if (func == NULL)
  				return 1;
  
  			func->bus = ctrl->bus;
  			func->device = device;
  			func->function = 0;
  			func->configured = 0;
  			func->is_a_board = 0;
  
  			/* We have to save the presence info for these slots */
  			temp_word = ctrl->ctrl_int_comp >> 16;
  			func->presence_save = (temp_word >> hp_slot) & 0x01;
  			func->presence_save |=
  			(temp_word >> (hp_slot + 7)) & 0x02;
  
  			if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
  				func->switch_save = 0;
  			} else {
  				func->switch_save = 0x10;
  			}
  		}
  	}
  
  	if (rc)
  		dbg("%s: rc = %d\n", __func__, rc);
  
  	return rc;
  }
  
  
  int cpqhp_process_SS(struct controller *ctrl, struct pci_func *func)
  {
  	u8 device, class_code, header_type, BCR;
  	u8 index = 0;
  	u8 replace_flag;
  	u32 rc = 0;
  	unsigned int devfn;
  	struct slot *p_slot;
  	struct pci_bus *pci_bus = ctrl->pci_bus;
  	int physical_slot = 0;
  
  	device = func->device;
  	func = cpqhp_slot_find(ctrl->bus, device, index++);
  	p_slot = cpqhp_find_slot(ctrl, device);
  	if (p_slot)
  		physical_slot = p_slot->number;
  
  	/* Make sure there are no video controllers here */
  	while (func && !rc) {
  		pci_bus->number = func->bus;
  		devfn = PCI_DEVFN(func->device, func->function);
  
  		/* Check the Class Code */
  		rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
  		if (rc)
  			return rc;
  
  		if (class_code == PCI_BASE_CLASS_DISPLAY) {
  			/* Display/Video adapter (not supported) */
  			rc = REMOVE_NOT_SUPPORTED;
  		} else {
  			/* See if it's a bridge */
  			rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
  			if (rc)
  				return rc;
  
  			/* If it's a bridge, check the VGA Enable bit */
  			if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
  				rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
  				if (rc)
  					return rc;
  
  				/* If the VGA Enable bit is set, remove isn't
  				 * supported */
  				if (BCR & PCI_BRIDGE_CTL_VGA)
  					rc = REMOVE_NOT_SUPPORTED;
  			}
  		}
  
  		func = cpqhp_slot_find(ctrl->bus, device, index++);
  	}
  
  	func = cpqhp_slot_find(ctrl->bus, device, 0);
  	if ((func != NULL) && !rc) {
  		/* FIXME: Replace flag should be passed into process_SS */
  		replace_flag = !(ctrl->add_support);
  		rc = remove_board(func, replace_flag, ctrl);
  	} else if (!rc) {
  		rc = 1;
  	}
  
  	return rc;
  }
  
  /**
   * switch_leds - switch the leds, go from one site to the other.
   * @ctrl: controller to use
   * @num_of_slots: number of slots to use
   * @work_LED: LED control value
   * @direction: 1 to start from the left side, 0 to start right.
   */
  static void switch_leds(struct controller *ctrl, const int num_of_slots,
  			u32 *work_LED, const int direction)
  {
  	int loop;
  
  	for (loop = 0; loop < num_of_slots; loop++) {
  		if (direction)
  			*work_LED = *work_LED >> 1;
  		else
  			*work_LED = *work_LED << 1;
  		writel(*work_LED, ctrl->hpc_reg + LED_CONTROL);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOGO interrupt */
  		wait_for_ctrl_irq(ctrl);
  
  		/* Get ready for next iteration */
  		long_delay((2*HZ)/10);
  	}
  }
  
  /**
   * cpqhp_hardware_test - runs hardware tests
   * @ctrl: target controller
   * @test_num: the number written to the "test" file in sysfs.
   *
   * For hot plug ctrl folks to play with.
   */
  int cpqhp_hardware_test(struct controller *ctrl, int test_num)
  {
  	u32 save_LED;
  	u32 work_LED;
  	int loop;
  	int num_of_slots;
  
  	num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0f;
  
  	switch (test_num) {
  	case 1:
  		/* Do stuff here! */
  
  		/* Do that funky LED thing */
  		/* so we can restore them later */
  		save_LED = readl(ctrl->hpc_reg + LED_CONTROL);
  		work_LED = 0x01010101;
  		switch_leds(ctrl, num_of_slots, &work_LED, 0);
  		switch_leds(ctrl, num_of_slots, &work_LED, 1);
  		switch_leds(ctrl, num_of_slots, &work_LED, 0);
  		switch_leds(ctrl, num_of_slots, &work_LED, 1);
  
  		work_LED = 0x01010000;
  		writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
  		switch_leds(ctrl, num_of_slots, &work_LED, 0);
  		switch_leds(ctrl, num_of_slots, &work_LED, 1);
  		work_LED = 0x00000101;
  		writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
  		switch_leds(ctrl, num_of_slots, &work_LED, 0);
  		switch_leds(ctrl, num_of_slots, &work_LED, 1);
  
  		work_LED = 0x01010000;
  		writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
  		for (loop = 0; loop < num_of_slots; loop++) {
  			set_SOGO(ctrl);
  
  			/* Wait for SOGO interrupt */
  			wait_for_ctrl_irq(ctrl);
  
  			/* Get ready for next iteration */
  			long_delay((3*HZ)/10);
  			work_LED = work_LED >> 16;
  			writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
  
  			set_SOGO(ctrl);
  
  			/* Wait for SOGO interrupt */
  			wait_for_ctrl_irq(ctrl);
  
  			/* Get ready for next iteration */
  			long_delay((3*HZ)/10);
  			work_LED = work_LED << 16;
  			writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
  			work_LED = work_LED << 1;
  			writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
  		}
  
  		/* put it back the way it was */
  		writel(save_LED, ctrl->hpc_reg + LED_CONTROL);
  
  		set_SOGO(ctrl);
  
  		/* Wait for SOBS to be unset */
  		wait_for_ctrl_irq(ctrl);
  		break;
  	case 2:
  		/* Do other stuff here! */
  		break;
  	case 3:
  		/* and more... */
  		break;
  	}
  	return 0;
  }
  
  
  /**
   * configure_new_device - Configures the PCI header information of one board.
   * @ctrl: pointer to controller structure
   * @func: pointer to function structure
   * @behind_bridge: 1 if this is a recursive call, 0 if not
   * @resources: pointer to set of resource lists
   *
   * Returns 0 if success.
   */
  static u32 configure_new_device(struct controller  *ctrl, struct pci_func  *func,
  				 u8 behind_bridge, struct resource_lists  *resources)
  {
  	u8 temp_byte, function, max_functions, stop_it;
  	int rc;
  	u32 ID;
  	struct pci_func *new_slot;
  	int index;
  
  	new_slot = func;
  
  	dbg("%s\n", __func__);
  	/* Check for Multi-function device */
  	ctrl->pci_bus->number = func->bus;
  	rc = pci_bus_read_config_byte(ctrl->pci_bus, PCI_DEVFN(func->device, func->function), 0x0E, &temp_byte);
  	if (rc) {
  		dbg("%s: rc = %d\n", __func__, rc);
  		return rc;
  	}
  
  	if (temp_byte & 0x80)	/* Multi-function device */
  		max_functions = 8;
  	else
  		max_functions = 1;
  
  	function = 0;
  
  	do {
  		rc = configure_new_function(ctrl, new_slot, behind_bridge, resources);
  
  		if (rc) {
  			dbg("configure_new_function failed %d\n", rc);
  			index = 0;
  
  			while (new_slot) {
  				new_slot = cpqhp_slot_find(new_slot->bus, new_slot->device, index++);
  
  				if (new_slot)
  					cpqhp_return_board_resources(new_slot, resources);
  			}
  
  			return rc;
  		}
  
  		function++;
  
  		stop_it = 0;
  
  		/* The following loop skips to the next present function
  		 * and creates a board structure */
  
  		while ((function < max_functions) && (!stop_it)) {
  			pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID);
  
  			if (ID == 0xFFFFFFFF) {
  				function++;
  			} else {
  				/* Setup slot structure. */
  				new_slot = cpqhp_slot_create(func->bus);
  
  				if (new_slot == NULL)
  					return 1;
  
  				new_slot->bus = func->bus;
  				new_slot->device = func->device;
  				new_slot->function = function;
  				new_slot->is_a_board = 1;
  				new_slot->status = 0;
  
  				stop_it++;
  			}
  		}
  
  	} while (function < max_functions);
  	dbg("returning from configure_new_device\n");
  
  	return 0;
  }
  
  
  /*
   * Configuration logic that involves the hotplug data structures and
   * their bookkeeping
   */
  
  
  /**
   * configure_new_function - Configures the PCI header information of one device
   * @ctrl: pointer to controller structure
   * @func: pointer to function structure
   * @behind_bridge: 1 if this is a recursive call, 0 if not
   * @resources: pointer to set of resource lists
   *
   * Calls itself recursively for bridged devices.
   * Returns 0 if success.
   */
  static int configure_new_function(struct controller *ctrl, struct pci_func *func,
  				   u8 behind_bridge,
  				   struct resource_lists *resources)
  {
  	int cloop;
  	u8 IRQ = 0;
  	u8 temp_byte;
  	u8 device;
  	u8 class_code;
  	u16 command;
  	u16 temp_word;
  	u32 temp_dword;
  	u32 rc;
  	u32 temp_register;
  	u32 base;
  	u32 ID;
  	unsigned int devfn;
  	struct pci_resource *mem_node;
  	struct pci_resource *p_mem_node;
  	struct pci_resource *io_node;
  	struct pci_resource *bus_node;
  	struct pci_resource *hold_mem_node;
  	struct pci_resource *hold_p_mem_node;
  	struct pci_resource *hold_IO_node;
  	struct pci_resource *hold_bus_node;
  	struct irq_mapping irqs;
  	struct pci_func *new_slot;
  	struct pci_bus *pci_bus;
  	struct resource_lists temp_resources;
  
  	pci_bus = ctrl->pci_bus;
  	pci_bus->number = func->bus;
  	devfn = PCI_DEVFN(func->device, func->function);
  
  	/* Check for Bridge */
  	rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &temp_byte);
  	if (rc)
  		return rc;
  
  	if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
  		/* set Primary bus */
  		dbg("set Primary bus = %d\n", func->bus);
  		rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_PRIMARY_BUS, func->bus);
  		if (rc)
  			return rc;
  
  		/* find range of 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 (ID != 0xFFFFFFFF) {	  /*  device present */
  				/* Setup slot structure. */
  				new_slot = cpqhp_slot_create(hold_bus_node->base);
  
  				if (new_slot == NULL) {
  					rc = -ENOMEM;
  					continue;
  				}
  
  				new_slot->bus = hold_bus_node->base;
  				new_slot->device = device;
  				new_slot->function = 0;
  				new_slot->is_a_board = 1;
  				new_slot->status = 0;
  
  				rc = configure_new_device(ctrl, new_slot, 1, &temp_resources);
  				dbg("configure_new_device rc=0x%x\n", rc);
  			}	/* End of IF (device in slot?) */
  		}		/* End of FOR loop */
  
  		if (rc)
  			goto free_and_out;
  		/* save the interrupt routing information */
  		if (resources->irqs) {
  			resources->irqs->interrupt[0] = irqs.interrupt[0];
  			resources->irqs->interrupt[1] = irqs.interrupt[1];
  			resources->irqs->interrupt[2] = irqs.interrupt[2];
  			resources->irqs->interrupt[3] = irqs.interrupt[3];
  			resources->irqs->valid_INT = irqs.valid_INT;
  		} else if (!behind_bridge) {
  			/* We need to hook up the interrupts here */
  			for (cloop = 0; cloop < 4; cloop++) {
  				if (irqs.valid_INT & (0x01 << cloop)) {
  					rc = cpqhp_set_irq(func->bus, func->device,
  							   cloop + 1, irqs.interrupt[cloop]);
  					if (rc)
  						goto free_and_out;
  				}
  			}	/* end of for loop */
  		}
  		/* Return unused bus resources
  		 * First use the temporary node to store information for
  		 * the board */
  		if (bus_node && temp_resources.bus_head) {
  			hold_bus_node->length = bus_node->base - hold_bus_node->base;
  
  			hold_bus_node->next = func->bus_head;
  			func->bus_head = hold_bus_node;
  
  			temp_byte = temp_resources.bus_head->base - 1;
  
  			/* set subordinate bus */
  			rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
  
  			if (temp_resources.bus_head->length == 0) {
  				kfree(temp_resources.bus_head);
  				temp_resources.bus_head = NULL;
  			} else {
  				return_resource(&(resources->bus_head), temp_resources.bus_head);
  			}
  		}
  
  		/* If we have IO space available and there is some left,
  		 * return the unused portion */
  		if (hold_IO_node && temp_resources.io_head) {
  			io_node = do_pre_bridge_resource_split(&(temp_resources.io_head),
  							       &hold_IO_node, 0x1000);
  
  			/* Check if we were able to split something off */
  			if (io_node) {
  				hold_IO_node->base = io_node->base + io_node->length;
  
  				temp_byte = (hold_IO_node->base) >> 8;
  				rc = pci_bus_write_config_word(pci_bus, devfn, PCI_IO_BASE, temp_byte);
  
  				return_resource(&(resources->io_head), io_node);
  			}
  
  			io_node = do_bridge_resource_split(&(temp_resources.io_head), 0x1000);
  
  			/* Check if we were able to split something off */
  			if (io_node) {
  				/* First use the temporary node to store
  				 * information for the board */
  				hold_IO_node->length = io_node->base - hold_IO_node->base;
  
  				/* If we used any, add it to the board's list */
  				if (hold_IO_node->length) {
  					hold_IO_node->next = func->io_head;
  					func->io_head = hold_IO_node;
  
  					temp_byte = (io_node->base - 1) >> 8;
  					rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);
  
  					return_resource(&(resources->io_head), io_node);
  				} else {
  					/* it doesn't need any IO */
  					temp_word = 0x0000;
  					rc = pci_bus_write_config_word(pci_bus, devfn, PCI_IO_LIMIT, temp_word);
  
  					return_resource(&(resources->io_head), io_node);
  					kfree(hold_IO_node);
  				}
  			} else {
  				/* it used most of the range */
  				hold_IO_node->next = func->io_head;
  				func->io_head = hold_IO_node;
  			}
  		} else if (hold_IO_node) {
  			/* it used the whole range */
  			hold_IO_node->next = func->io_head;
  			func->io_head = hold_IO_node;
  		}
  		/* If we have memory space available and there is some left,
  		 * return the unused portion */
  		if (hold_mem_node && temp_resources.mem_head) {
  			mem_node = do_pre_bridge_resource_split(&(temp_resources.  mem_head),
  								&hold_mem_node, 0x100000);
  
  			/* Check if we were able to split something off */
  			if (mem_node) {
  				hold_mem_node->base = mem_node->base + mem_node->length;
  
  				temp_word = (hold_mem_node->base) >> 16;
  				rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);
  
  				return_resource(&(resources->mem_head), mem_node);
  			}
  
  			mem_node = do_bridge_resource_split(&(temp_resources.mem_head), 0x100000);
  
  			/* Check if we were able to split something off */
  			if (mem_node) {
  				/* First use the temporary node to store
  				 * information for the board */
  				hold_mem_node->length = mem_node->base - hold_mem_node->base;
  
  				if (hold_mem_node->length) {
  					hold_mem_node->next = func->mem_head;
  					func->mem_head = hold_mem_node;
  
  					/* configure end address */
  					temp_word = (mem_node->base - 1) >> 16;
  					rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
  
  					/* Return unused resources to the pool */
  					return_resource(&(resources->mem_head), mem_node);
  				} else {
  					/* it doesn't need any Mem */
  					temp_word = 0x0000;
  					rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
  
  					return_resource(&(resources->mem_head), mem_node);
  					kfree(hold_mem_node);
  				}
  			} else {
  				/* it used most of the range */
  				hold_mem_node->next = func->mem_head;
  				func->mem_head = hold_mem_node;
  			}
  		} else if (hold_mem_node) {
  			/* it used the whole range */
  			hold_mem_node->next = func->mem_head;
  			func->mem_head = hold_mem_node;
  		}
  		/* If we have prefetchable memory space available and there
  		 * is some left at the end, return the unused portion */
  		if (temp_resources.p_mem_head) {
  			p_mem_node = do_pre_bridge_resource_split(&(temp_resources.p_mem_head),
  								  &hold_p_mem_node, 0x100000);
  
  			/* Check if we were able to split something off */
  			if (p_mem_node) {
  				hold_p_mem_node->base = p_mem_node->base + p_mem_node->length;
  
  				temp_word = (hold_p_mem_node->base) >> 16;
  				rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);
  
  				return_resource(&(resources->p_mem_head), p_mem_node);
  			}
  
  			p_mem_node = do_bridge_resource_split(&(temp_resources.p_mem_head), 0x100000);
  
  			/* Check if we were able to split something off */
  			if (p_mem_node) {
  				/* First use the temporary node to store
  				 * information for the board */
  				hold_p_mem_node->length = p_mem_node->base - hold_p_mem_node->base;
  
  				/* If we used any, add it to the board's list */
  				if (hold_p_mem_node->length) {
  					hold_p_mem_node->next = func->p_mem_head;
  					func->p_mem_head = hold_p_mem_node;
  
  					temp_word = (p_mem_node->base - 1) >> 16;
  					rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
  
  					return_resource(&(resources->p_mem_head), p_mem_node);
  				} else {
  					/* it doesn't need any PMem */
  					temp_word = 0x0000;
  					rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
  
  					return_resource(&(resources->p_mem_head), p_mem_node);
  					kfree(hold_p_mem_node);
  				}
  			} else {
  				/* it used the most of the range */
  				hold_p_mem_node->next = func->p_mem_head;
  				func->p_mem_head = hold_p_mem_node;
  			}
  		} else if (hold_p_mem_node) {
  			/* it used the whole range */
  			hold_p_mem_node->next = func->p_mem_head;
  			func->p_mem_head = hold_p_mem_node;
  		}
  		/* We should be configuring an IRQ and the bridge's base address
  		 * registers if it needs them.  Although we have never seen such
  		 * a device */
  
  		/* enable card */
  		command = 0x0157;	/* = PCI_COMMAND_IO |
  					 *   PCI_COMMAND_MEMORY |
  					 *   PCI_COMMAND_MASTER |
  					 *   PCI_COMMAND_INVALIDATE |
  					 *   PCI_COMMAND_PARITY |
  					 *   PCI_COMMAND_SERR */
  		rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
  
  		/* set Bridge Control Register */
  		command = 0x07;		/* = PCI_BRIDGE_CTL_PARITY |
  					 *   PCI_BRIDGE_CTL_SERR |
  					 *   PCI_BRIDGE_CTL_NO_ISA */
  		rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, command);
  	} else if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
  		/* Standard device */
  		rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
  
  		if (class_code == PCI_BASE_CLASS_DISPLAY) {
  			/* Display (video) adapter (not supported) */
  			return DEVICE_TYPE_NOT_SUPPORTED;
  		}
  		/* Figure out IO and memory needs */
  		for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
  			temp_register = 0xFFFFFFFF;
  
  			dbg("CND: bus=%d, devfn=%d, offset=%d\n", pci_bus->number, devfn, cloop);
  			rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, temp_register);
  
  			rc = pci_bus_read_config_dword(pci_bus, devfn, cloop, &temp_register);
  			dbg("CND: base = 0x%x\n", temp_register);
  
  			if (temp_register) {	  /* If this register is implemented */
  				if ((temp_register & 0x03L) == 0x01) {
  					/* Map IO */
  
  					/* set base = amount of IO space */
  					base = temp_register & 0xFFFFFFFC;
  					base = ~base + 1;
  
  					dbg("CND:      length = 0x%x\n", base);
  					io_node = get_io_resource(&(resources->io_head), base);
  					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;
  }
  