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

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include "cpqphp.h"
#include "cpqphp_nvram.h"
#include "../../arch/i386/kernel/pci-i386.h"    /* horrible hack showing how processor dependant we are... */


u8 cpqhp_nic_irq;
u8 cpqhp_disk_irq;

static u16 unused_IRQ;


static int is_pci_dev_in_use(struct pci_dev* dev) 
{
        /* 
         * dev->driver will be set if the device is in use by a new-style 
         * driver -- otherwise, check the device's regions to see if any
         * driver has claimed them
         */

        int i, inuse=0;

        if (dev->driver) return 1; //assume driver feels responsible

        for (i = 0; !dev->driver && !inuse && (i < 6); i++) {
                if (!pci_resource_start(dev, i))
                        continue;

                if (pci_resource_flags(dev, i) & IORESOURCE_IO)
                        inuse = check_region(pci_resource_start(dev, i),
                                             pci_resource_len(dev, i));
                else if (pci_resource_flags(dev, i) & IORESOURCE_MEM)
                        inuse = check_mem_region(pci_resource_start(dev, i),
                                                 pci_resource_len(dev, i));
        }

        return inuse;

}


static int pci_hp_remove_device(struct pci_dev *dev)
{
        if (is_pci_dev_in_use(dev)) {
                err("***Cannot safely power down device -- "
                       "it appears to be in use***\n");
                return -EBUSY;
        }
        pci_remove_device(dev);
        return 0;
}


/*
 * detect_HRT_floating_pointer
 *
 * find the Hot Plug Resource Table in the specified region of memory.
 *
 */
static void *detect_HRT_floating_pointer(void *begin, void *end)
{
        void *fp;
        void *endp;
        u8 temp1, temp2, temp3, temp4;
        int status = 0;

        endp = (end - sizeof(struct hrt) + 1);

        for (fp = begin; fp <= endp; fp += 16) {
                temp1 = readb(fp + SIG0);
                temp2 = readb(fp + SIG1);
                temp3 = readb(fp + SIG2);
                temp4 = readb(fp + SIG3);
                if (temp1 == '$' &&
                    temp2 == 'H' &&
                    temp3 == 'R' &&
                    temp4 == 'T') {
                        status = 1;
                        break;
                }
        }

        if (!status)
                fp = NULL;

        dbg("Discovered Hotplug Resource Table at %p\n", fp);
        return fp;
}

static int configure_visit_pci_dev (struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_bus) 
{
        struct pci_bus* bus = wrapped_bus->bus;
        struct pci_dev* dev = wrapped_dev->dev;
        struct pci_func *temp_func;
        int i=0;

        //We need to fix up the hotplug function representation with the linux representation
        do {
                temp_func = cpqhp_slot_find(dev->bus->number, dev->devfn >> 3, i++);
        } while (temp_func && (temp_func->function != (dev->devfn & 0x07)));

        if (temp_func) {
                temp_func->pci_dev = dev;
        } else {
                //We did not even find a hotplug rep of the function, create it
                //This code might be taken out if we can guarantee the creation of functions
                //in parallel (hotplug and Linux at the same time).
                dbg("@@@@@@@@@@@ cpqhp_slot_create in %s\n", __FUNCTION__);
                temp_func = cpqhp_slot_create(bus->number);
                if (temp_func == NULL)
                        return -ENOMEM;
                temp_func->pci_dev = dev;
        }

        //Create /proc/bus/pci proc entry for this device and bus device is on
        //Notify the drivers of the change
        if (temp_func->pci_dev) {
                pci_proc_attach_device(temp_func->pci_dev);
                pci_announce_device_to_drivers(temp_func->pci_dev);
        }

        return 0;
}


static int unconfigure_visit_pci_dev_phase2 (struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_bus) 
{
        struct pci_dev* dev = wrapped_dev->dev;

        struct pci_func *temp_func;
        int i=0;

        //We need to remove the hotplug function representation with the linux representation
        do {
                temp_func = cpqhp_slot_find(dev->bus->number, dev->devfn >> 3, i++);
                if (temp_func) {
                        dbg("temp_func->function = %d\n", temp_func->function);
                }
        } while (temp_func && (temp_func->function != (dev->devfn & 0x07)));

        //Now, remove the Linux Representation
        if (dev) {
                if (pci_hp_remove_device(dev) == 0) {
                        kfree(dev); //Now, remove
                } else {
                        return -1; // problems while freeing, abort visitation
                }
        }

        if (temp_func) {
                temp_func->pci_dev = NULL;
        } else {
                dbg("No pci_func representation for bus, devfn = %d, %x\n", dev->bus->number, dev->devfn);
        }

        return 0;
}


static int unconfigure_visit_pci_bus_phase2 (struct pci_bus_wrapped *wrapped_bus, struct pci_dev_wrapped *wrapped_dev) 
{
        struct pci_bus* bus = wrapped_bus->bus;

        //The cleanup code for proc entries regarding buses should be in the kernel...
        if (bus->procdir)
                dbg("detach_pci_bus %s\n", bus->procdir->name);
        pci_proc_detach_bus(bus);
        // The cleanup code should live in the kernel...
        bus->self->subordinate = NULL;
        // unlink from parent bus
        list_del(&bus->node);

        // Now, remove
        if (bus)
                kfree(bus);

        return 0;
}


static int unconfigure_visit_pci_dev_phase1 (struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_bus) 
{
        struct pci_dev* dev = wrapped_dev->dev;

        dbg("attempting removal of driver for device (%x, %x, %x)\n", dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
        //Now, remove the Linux Driver Representation 
        if (dev->driver) {
                if (dev->driver->remove) {
                        dev->driver->remove(dev);
                        dbg("driver was properly removed\n");
                }
                dev->driver = NULL;
        }

        return is_pci_dev_in_use(dev);
}


static struct pci_visit configure_functions = {
        visit_pci_dev:          configure_visit_pci_dev,
};


static struct pci_visit unconfigure_functions_phase1 = {
        post_visit_pci_dev:     unconfigure_visit_pci_dev_phase1
};

static struct pci_visit unconfigure_functions_phase2 = {
        post_visit_pci_bus:     unconfigure_visit_pci_bus_phase2,               
        post_visit_pci_dev:     unconfigure_visit_pci_dev_phase2
};


int cpqhp_configure_device (struct controller* ctrl, struct pci_func* func)  
{
        unsigned char bus;
        struct pci_dev dev0;
        struct pci_bus *child;
        struct pci_dev* temp;
        int rc = 0;

        struct pci_dev_wrapped wrapped_dev;
        struct pci_bus_wrapped wrapped_bus;
        memset(&wrapped_dev, 0, sizeof(struct pci_dev_wrapped));
        memset(&wrapped_bus, 0, sizeof(struct pci_bus_wrapped));

        memset(&dev0, 0, sizeof(struct pci_dev));

        if (func->pci_dev == NULL)
                func->pci_dev = pci_find_slot(func->bus, (func->device << 3) | (func->function & 0x7));

        //Still NULL ? Well then scan for it !
        if (func->pci_dev == NULL) {
                dbg("INFO: pci_dev still null\n");
                dev0.bus = ctrl->pci_dev->bus;
                dev0.devfn = (func->device << 3) + (func->function & 0x7);
                dev0.sysdata = ctrl->pci_dev->sysdata;

                //this will generate pci_dev structures for all functions, but we will only call this case when lookup fails
                func->pci_dev = pci_scan_slot(&dev0);
                if (func->pci_dev == NULL) {
                        dbg("ERROR: pci_dev still null\n");
                        return 0;
                }
        }

        if (func->pci_dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
                pci_read_config_byte(func->pci_dev, PCI_SECONDARY_BUS, &bus);
                child = (struct pci_bus*) pci_add_new_bus(func->pci_dev->bus, (func->pci_dev), bus);
                pci_do_scan_bus(child);

        }

        temp = func->pci_dev;

        if (temp) {
                wrapped_dev.dev = temp;
                wrapped_bus.bus = temp->bus;
                rc = pci_visit_dev(&configure_functions, &wrapped_dev, &wrapped_bus);
        }
        return rc;
}


int cpqhp_unconfigure_device(struct pci_func* func) 
{
        int rc = 0;
        int j;
        struct pci_dev_wrapped wrapped_dev;
        struct pci_bus_wrapped wrapped_bus;
        
        memset(&wrapped_dev, 0, sizeof(struct pci_dev_wrapped));
        memset(&wrapped_bus, 0, sizeof(struct pci_bus_wrapped));

        dbg("%s: bus/dev/func = %x/%x/%x\n", __FUNCTION__, func->bus, func->device, func->function);

        for (j=0; j<8 ; j++) {
                struct pci_dev* temp = pci_find_slot(func->bus, (func->device << 3) | j);
                if (temp) {
                        wrapped_dev.dev = temp;
                        wrapped_bus.bus = temp->bus;
                        rc = pci_visit_dev(&unconfigure_functions_phase1, &wrapped_dev, &wrapped_bus);
                        if (rc)
                                break;

                        rc = pci_visit_dev(&unconfigure_functions_phase2, &wrapped_dev, &wrapped_bus);
                        if (rc)
                                break;
                }
        }
        return rc;
}

static int PCI_RefinedAccessConfig(struct pci_ops *ops, u8 bus, u8 device, u8 function, u8 offset, u32 *value)
{
        u32 vendID = 0;

        if (pci_read_config_dword_nodev (ops, bus, device, function, PCI_VENDOR_ID, &vendID) == -1)
                return -1;
        if (vendID == 0xffffffff)
                return -1;
        return pci_read_config_dword_nodev (ops, bus, device, function, offset, value);
}


/*
 * cpqhp_set_irq
 *
 * @bus_num: bus number of PCI device
 * @dev_num: device number of PCI device
 * @slot: pointer to u8 where slot number will be returned
 */
int cpqhp_set_irq (u8 bus_num, u8 dev_num, u8 int_pin, u8 irq_num)
{
        int rc;
        u16 temp_word;
        struct pci_dev fakedev;
        struct pci_bus fakebus;

        fakedev.devfn = dev_num << 3;
        fakedev.bus = &fakebus;
        fakebus.number = bus_num;
        dbg("%s: dev %d, bus %d, pin %d, num %d\n",
            __FUNCTION__, dev_num, bus_num, int_pin, irq_num);
        rc = pcibios_set_irq_routing(&fakedev, int_pin - 0x0a, irq_num);
        dbg("%s:rc %d\n", __FUNCTION__, rc);
        if (!rc)
                return !rc;

        // set the Edge Level Control Register (ELCR)
        temp_word = inb(0x4d0);
        temp_word |= inb(0x4d1) << 8;

        temp_word |= 0x01 << irq_num;

        // This should only be for x86 as it sets the Edge Level Control Register
        outb((u8) (temp_word & 0xFF), 0x4d0);
        outb((u8) ((temp_word & 0xFF00) >> 8), 0x4d1);

        return 0;
}


/*
 * WTF??? This function isn't in the code, yet a function calls it, but the 
 * compiler optimizes it away?  strange.  Here as a placeholder to keep the 
 * compiler happy.
 */
static int PCI_ScanBusNonBridge (u8 bus, u8 device)
{
        return 0;
}

static int PCI_ScanBusForNonBridge(struct controller *ctrl, u8 bus_num, u8 * dev_num)
{
        u16 tdevice;
        u32 work;
        u8 tbus;

        for (tdevice = 0; tdevice < 0x100; tdevice++) {
                //Scan for access first
                if (PCI_RefinedAccessConfig(ctrl->pci_ops, bus_num, tdevice >> 3, tdevice & 0x7, 0x08, &work) == -1)
                        continue;
                dbg("Looking for nonbridge bus_num %d dev_num %d\n", bus_num, tdevice);
                //Yep we got one. Not a bridge ?
                if ((work >> 8) != PCI_TO_PCI_BRIDGE_CLASS) {
                        *dev_num = tdevice;
                        dbg("found it !\n");
                        return 0;
                }
        }
        for (tdevice = 0; tdevice < 0x100; tdevice++) {
                //Scan for access first
                if (PCI_RefinedAccessConfig(ctrl->pci_ops, bus_num, tdevice >> 3, tdevice & 0x7, 0x08, &work) == -1)
                        continue;
                dbg("Looking for bridge bus_num %d dev_num %d\n", bus_num, tdevice);
                //Yep we got one. bridge ?
                if ((work >> 8) == PCI_TO_PCI_BRIDGE_CLASS) {
                        pci_read_config_byte_nodev (ctrl->pci_ops, tbus, tdevice, 0, PCI_SECONDARY_BUS, &tbus);
                        dbg("Recurse on bus_num %d tdevice %d\n", tbus, tdevice);
                        if (PCI_ScanBusNonBridge(tbus, tdevice) == 0)
                                return 0;
                }
        }

        return -1;
}


static int PCI_GetBusDevHelper(struct controller *ctrl, u8 *bus_num, u8 *dev_num, u8 slot, u8 nobridge)
{
        struct irq_routing_table *PCIIRQRoutingInfoLength;
        long len;
        long loop;
        u32 work;

        u8 tbus, tdevice, tslot;

        PCIIRQRoutingInfoLength = pcibios_get_irq_routing_table();

        len = (PCIIRQRoutingInfoLength->size -
               sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
        // Make sure I got at least one entry
        if (len == 0) {
                if (PCIIRQRoutingInfoLength != NULL)
                        kfree(PCIIRQRoutingInfoLength );
                return -1;
        }

        for (loop = 0; loop < len; ++loop) {
                tbus = PCIIRQRoutingInfoLength->slots[loop].bus;
                tdevice = PCIIRQRoutingInfoLength->slots[loop].devfn;
                tslot = PCIIRQRoutingInfoLength->slots[loop].slot;

                if (tslot == slot) {
                        *bus_num = tbus;
                        *dev_num = tdevice;
                        pci_read_config_dword_nodev (ctrl->pci_ops, *bus_num, *dev_num >> 3, *dev_num & 0x7, PCI_VENDOR_ID, &work);
                        if (!nobridge || (work == 0xffffffff)) {
                                if (PCIIRQRoutingInfoLength != NULL)
                                        kfree(PCIIRQRoutingInfoLength );
                                return 0;
                        }

                        dbg("bus_num %d dev_num %d func_num %d\n", *bus_num, *dev_num >> 3, *dev_num & 0x7);
                        pci_read_config_dword_nodev (ctrl->pci_ops, *bus_num, *dev_num >> 3, *dev_num & 0x7, PCI_CLASS_REVISION, &work);
                        dbg("work >> 8 (%x) = BRIDGE (%x)\n", work >> 8, PCI_TO_PCI_BRIDGE_CLASS);

                        if ((work >> 8) == PCI_TO_PCI_BRIDGE_CLASS) {
                                pci_read_config_byte_nodev (ctrl->pci_ops, *bus_num, *dev_num >> 3, *dev_num & 0x7, PCI_SECONDARY_BUS, &tbus);
                                dbg("Scan bus for Non Bridge: bus %d\n", tbus);
                                if (PCI_ScanBusForNonBridge(ctrl, tbus, dev_num) == 0) {
                                        *bus_num = tbus;
                                        if (PCIIRQRoutingInfoLength != NULL)
                                                kfree(PCIIRQRoutingInfoLength );
                                        return 0;
                                }
                        } else {
                                if (PCIIRQRoutingInfoLength != NULL)
                                        kfree(PCIIRQRoutingInfoLength );
                                return 0;
                        }

                }
        }
        if (PCIIRQRoutingInfoLength != NULL)
                kfree(PCIIRQRoutingInfoLength );
        return -1;
}


int cpqhp_get_bus_dev (struct controller *ctrl, u8 * bus_num, u8 * dev_num, u8 slot)
{
        return PCI_GetBusDevHelper(ctrl, bus_num, dev_num, slot, 0);    //plain (bridges allowed)
}


/* More PCI configuration routines; this time centered around hotplug controller */


/*
 * cpqhp_save_config
 *
 * Reads configuration for all slots in a PCI bus and saves info.
 *
 * Note:  For non-hot plug busses, the slot # saved is the device #
 *
 * returns 0 if success
 */
int cpqhp_save_config(struct controller *ctrl, int busnumber, int is_hot_plug)
{
        long rc;
        u8 class_code;
        u8 header_type;
        u32 ID;
        u8 secondary_bus;
        struct pci_func *new_slot;
        int sub_bus;
        int FirstSupported;
        int LastSupported;
        int max_functions;
        int function;
        u8 DevError;
        int device = 0;
        int cloop = 0;
        int stop_it;
        int index;

        //              Decide which slots are supported

        if (is_hot_plug) {
                //*********************************
                // is_hot_plug is the slot mask
                //*********************************
                FirstSupported = is_hot_plug >> 4;
                LastSupported = FirstSupported + (is_hot_plug & 0x0F) - 1;
        } else {
                FirstSupported = 0;
                LastSupported = 0x1F;
        }

        //     Save PCI configuration space for all devices in supported slots

        for (device = FirstSupported; device <= LastSupported; device++) {
                ID = 0xFFFFFFFF;
                rc = pci_read_config_dword_nodev (ctrl->pci_ops, busnumber, device, 0, PCI_VENDOR_ID, &ID);

                if (ID != 0xFFFFFFFF) {   //  device in slot
                        rc = pci_read_config_byte_nodev (ctrl->pci_ops, busnumber, device, 0, 0x0B, &class_code);
                        if (rc)
                                return rc;

                        rc = pci_read_config_byte_nodev (ctrl->pci_ops, busnumber, device, 0, PCI_HEADER_TYPE, &header_type);
                        if (rc)
                                return rc;

                        // If multi-function device, set max_functions to 8
                        if (header_type & 0x80)
                                max_functions = 8;
                        else
                                max_functions = 1;

                        function = 0;

                        do {
                                DevError = 0;

                                if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {   // P-P Bridge
                                        //  Recurse the subordinate bus
                                        //  get the subordinate bus number
                                        rc = pci_read_config_byte_nodev (ctrl->pci_ops, busnumber, device, function, PCI_SECONDARY_BUS, &secondary_bus);
                                        if (rc) {
                                                return rc;
                                        } else {
                                                sub_bus = (int) secondary_bus;

                                                // Save secondary bus cfg spc
                                                // with this recursive call.
                                                rc = cpqhp_save_config(ctrl, sub_bus, 0);

                                                if (rc)
                                                        return rc;
                                        }
                                }

                                index = 0;
                                new_slot = cpqhp_slot_find(busnumber, device, index++);
                                while (new_slot && 
                                       (new_slot->function != (u8) function))
                                        new_slot = cpqhp_slot_find(busnumber, device, index++);

                                if (!new_slot) {
                                        // Setup slot structure.
                                        new_slot = cpqhp_slot_create(busnumber);

                                        if (new_slot == NULL)
                                                return(1);
                                }

                                new_slot->bus = (u8) busnumber;
                                new_slot->device = (u8) device;
                                new_slot->function = (u8) function;
                                new_slot->is_a_board = 1;
                                new_slot->switch_save = 0x10;
                                // In case of unsupported board
                                new_slot->status = DevError;
                                new_slot->pci_dev = pci_find_slot(new_slot->bus, (new_slot->device << 3) | new_slot->function);

                                for (cloop = 0; cloop < 0x20; cloop++) {
                                        rc = pci_read_config_dword_nodev (ctrl->pci_ops, busnumber, device, function, cloop << 2, (u32 *) & (new_slot-> config_space [cloop]));
                                        if (rc)
                                                return rc;
                                }

                                function++;

                                stop_it = 0;

                                //  this loop skips to the next present function
                                //  reading in Class Code and Header type.

                                while ((function < max_functions)&&(!stop_it)) {
                                        rc = pci_read_config_dword_nodev (ctrl->pci_ops, busnumber, device, function, PCI_VENDOR_ID, &ID);
                                        if (ID == 0xFFFFFFFF) {  // nothing there.
                                                function++;
                                        } else {  // Something there
                                                rc = pci_read_config_byte_nodev (ctrl->pci_ops, busnumber, device, function, 0x0B, &class_code);
                                                if (rc)
                                                        return rc;

                                                rc = pci_read_config_byte_nodev (ctrl->pci_ops, busnumber, device, function, PCI_HEADER_TYPE, &header_type);
                                                if (rc)
                                                        return rc;

                                                stop_it++;
                                        }
                                }

                        } while (function < max_functions);
                }               // End of IF (device in slot?)
                else if (is_hot_plug) {
                        // Setup slot structure with entry for empty slot
                        new_slot = cpqhp_slot_create(busnumber);

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

                        new_slot->bus = (u8) busnumber;
                        new_slot->device = (u8) device;
                        new_slot->function = 0;
                        new_slot->is_a_board = 0;
                        new_slot->presence_save = 0;
                        new_slot->switch_save = 0;
                }
        }                       // End of FOR loop

        return(0);
}


/*
 * cpqhp_save_slot_config
 *
 * Saves configuration info for all PCI devices in a given slot
 * including subordinate busses.
 *
 * returns 0 if success
 */
int cpqhp_save_slot_config (struct controller *ctrl, struct pci_func * new_slot)
{
        long rc;
        u8 class_code;
        u8 header_type;
        u32 ID;
        u8 secondary_bus;
        int sub_bus;
        int max_functions;
        int function;
        int cloop = 0;
        int stop_it;

        ID = 0xFFFFFFFF;

        pci_read_config_dword_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, 0, PCI_VENDOR_ID, &ID);

        if (ID != 0xFFFFFFFF) {   //  device in slot
                pci_read_config_byte_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, 0, 0x0B, &class_code);

                pci_read_config_byte_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, 0, PCI_HEADER_TYPE, &header_type);

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

                function = 0;

                do {
                        if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {     // PCI-PCI Bridge
                                //  Recurse the subordinate bus
                                pci_read_config_byte_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, function, PCI_SECONDARY_BUS, &secondary_bus);

                                sub_bus = (int) secondary_bus;

                                // Save the config headers for the secondary bus.
                                rc = cpqhp_save_config(ctrl, sub_bus, 0);

                                if (rc)
                                        return(rc);

                        }       // End of IF

                        new_slot->status = 0;

                        for (cloop = 0; cloop < 0x20; cloop++) {
                                pci_read_config_dword_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, function, cloop << 2, (u32 *) & (new_slot-> config_space [cloop]));
                        }

                        function++;

                        stop_it = 0;

                        //  this loop skips to the next present function
                        //  reading in the Class Code and the Header type.

                        while ((function < max_functions) && (!stop_it)) {
                                pci_read_config_dword_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, function, PCI_VENDOR_ID, &ID);

                                if (ID == 0xFFFFFFFF) {  // nothing there.
                                        function++;
                                } else {  // Something there
                                        pci_read_config_byte_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, function, 0x0B, &class_code);

                                        pci_read_config_byte_nodev (ctrl->pci_ops, new_slot->bus, new_slot->device, function, PCI_HEADER_TYPE, &header_type);

                                        stop_it++;
                                }
                        }

                } while (function < max_functions);
        }                       // End of IF (device in slot?)
        else {
                return(2);
        }

        return(0);
}


/*
 * cpqhp_save_base_addr_length
 *
 * Saves the length of all base address registers for the
 * specified slot.  this is for hot plug REPLACE
 *
 * returns 0 if success
 */
int cpqhp_save_base_addr_length(struct controller *ctrl, struct pci_func * func)
{
        u8 cloop;
        u8 header_type;
        u8 secondary_bus;
        u8 type;
        int sub_bus;
        u32 temp_register;
        u32 base;
        u32 rc;
        struct pci_func *next;
        int index = 0;

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

        while (func != NULL) {

                // Check for Bridge
                pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_HEADER_TYPE, &header_type);

                if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
                        // PCI-PCI Bridge
                        pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_SECONDARY_BUS, &secondary_bus);

                        sub_bus = (int) secondary_bus;

                        next = cpqhp_slot_list[sub_bus];

                        while (next != NULL) {
                                rc = cpqhp_save_base_addr_length(ctrl, next);

                                if (rc)
                                        return(rc);

                                next = next->next;
                        }

                        //FIXME: this loop is duplicated in the non-bridge case.  The two could be rolled together
                        // Figure out IO and memory base lengths
                        for (cloop = 0x10; cloop <= 0x14; cloop += 4) {
                                temp_register = 0xFFFFFFFF;
                                pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, cloop, temp_register);
                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &base);

                                if (base) {  // If this register is implemented
                                        if (base & 0x01L) {
                                                // IO base
                                                // set base = amount of IO space requested
                                                base = base & 0xFFFFFFFE;
                                                base = (~base) + 1;

                                                type = 1;
                                        } else {
                                                // memory base
                                                base = base & 0xFFFFFFF0;
                                                base = (~base) + 1;

                                                type = 0;
                                        }
                                } else {
                                        base = 0x0L;
                                        type = 0;
                                }

                                // Save information in slot structure
                                func->base_length[(cloop - 0x10) >> 2] =
                                base;
                                func->base_type[(cloop - 0x10) >> 2] = type;

                        }       // End of base register loop


                } else if ((header_type & 0x7F) == 0x00) {        // PCI-PCI Bridge
                        // Figure out IO and memory base lengths
                        for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
                                temp_register = 0xFFFFFFFF;
                                pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, cloop, temp_register);
                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &base);

                                if (base) {  // If this register is implemented
                                        if (base & 0x01L) {
                                                // IO base
                                                // base = amount of IO space requested
                                                base = base & 0xFFFFFFFE;
                                                base = (~base) + 1;

                                                type = 1;
                                        } else {
                                                // memory base
                                                // base = amount of memory space requested
                                                base = base & 0xFFFFFFF0;
                                                base = (~base) + 1;

                                                type = 0;
                                        }
                                } else {
                                        base = 0x0L;
                                        type = 0;
                                }

                                // Save information in slot structure
                                func->base_length[(cloop - 0x10) >> 2] = base;
                                func->base_type[(cloop - 0x10) >> 2] = type;

                        }       // End of base register loop

                } else {          // Some other unknown header type
                }

                // find the next device in this slot
                func = cpqhp_slot_find(func->bus, func->device, index++);
        }

        return(0);
}


/*
 * cpqhp_save_used_resources
 *
 * Stores used resource information for existing boards.  this is
 * for boards that were in the system when this driver was loaded.
 * this function is for hot plug ADD
 *
 * returns 0 if success
 */
int cpqhp_save_used_resources (struct controller *ctrl, struct pci_func * func)
{
        u8 cloop;
        u8 header_type;
        u8 secondary_bus;
        u8 temp_byte;
        u8 b_base;
        u8 b_length;
        u16 command;
        u16 save_command;
        u16 w_base;
        u16 w_length;
        u32 temp_register;
        u32 save_base;
        u32 base;
        int index = 0;
        struct pci_resource *mem_node;
        struct pci_resource *p_mem_node;
        struct pci_resource *io_node;
        struct pci_resource *bus_node;

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

        while ((func != NULL) && func->is_a_board) {
                // Save the command register
                pci_read_config_word_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_COMMAND, &save_command);

                // disable card
                command = 0x00;
                pci_write_config_word_nodev(ctrl->pci_ops, func->bus, func->device, func->function, PCI_COMMAND, command);

                // Check for Bridge
                pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_HEADER_TYPE, &header_type);

                if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {     // PCI-PCI Bridge
                        // Clear Bridge Control Register
                        command = 0x00;
                        pci_write_config_word_nodev(ctrl->pci_ops, func->bus, func->device, func->function, PCI_BRIDGE_CONTROL, command);

                        pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_SECONDARY_BUS, &secondary_bus);

                        pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_SUBORDINATE_BUS, &temp_byte);

                        bus_node =(struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                        if (!bus_node)
                                return -ENOMEM;

                        bus_node->base = secondary_bus;
                        bus_node->length = temp_byte - secondary_bus + 1;

                        bus_node->next = func->bus_head;
                        func->bus_head = bus_node;

                        // Save IO base and Limit registers
                        pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_IO_BASE, &b_base);

                        pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_IO_LIMIT, &b_length);

                        if ((b_base <= b_length) && (save_command & 0x01)) {
                                io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                if (!io_node)
                                        return -ENOMEM;

                                io_node->base = (b_base & 0xF0) << 8;
                                io_node->length = (b_length - b_base + 0x10) << 8;

                                io_node->next = func->io_head;
                                func->io_head = io_node;
                        }
                        // Save memory base and Limit registers
                        pci_read_config_word_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_MEMORY_BASE, &w_base);

                        pci_read_config_word_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_MEMORY_LIMIT, &w_length);

                        if ((w_base <= w_length) && (save_command & 0x02)) {
                                mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                if (!mem_node)
                                        return -ENOMEM;

                                mem_node->base = w_base << 16;
                                mem_node->length = (w_length - w_base + 0x10) << 16;

                                mem_node->next = func->mem_head;
                                func->mem_head = mem_node;
                        }
                        // Save prefetchable memory base and Limit registers
                        pci_read_config_word_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_PREF_MEMORY_BASE, &w_base);

                        pci_read_config_word_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_PREF_MEMORY_LIMIT, &w_length);

                        if ((w_base <= w_length) && (save_command & 0x02)) {
                                p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                if (!p_mem_node)
                                        return -ENOMEM;

                                p_mem_node->base = w_base << 16;
                                p_mem_node->length = (w_length - w_base + 0x10) << 16;

                                p_mem_node->next = func->p_mem_head;
                                func->p_mem_head = p_mem_node;
                        }
                        // Figure out IO and memory base lengths
                        for (cloop = 0x10; cloop <= 0x14; cloop += 4) {
                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &save_base);

                                temp_register = 0xFFFFFFFF;
                                pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, cloop, temp_register);

                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &base);

                                temp_register = base;

                                if (base) {  // If this register is implemented
                                        if (((base & 0x03L) == 0x01)
                                            && (save_command & 0x01)) {
                                                // IO base
                                                // set temp_register = amount of IO space requested
                                                temp_register = base & 0xFFFFFFFE;
                                                temp_register = (~temp_register) + 1;

                                                io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                                if (!io_node)

                                                        return -ENOMEM;

                                                io_node->base =
                                                save_base & (~0x03L);
                                                io_node->length = temp_register;

                                                io_node->next = func->io_head;
                                                func->io_head = io_node;
                                        } else
                                                if (((base & 0x0BL) == 0x08)
                                                    && (save_command & 0x02)) {
                                                // prefetchable memory base
                                                temp_register = base & 0xFFFFFFF0;
                                                temp_register = (~temp_register) + 1;

                                                p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                                if (!p_mem_node)
                                                        return -ENOMEM;

                                                p_mem_node->base = save_base & (~0x0FL);
                                                p_mem_node->length = temp_register;

                                                p_mem_node->next = func->p_mem_head;
                                                func->p_mem_head = p_mem_node;
                                        } else
                                                if (((base & 0x0BL) == 0x00)
                                                    && (save_command & 0x02)) {
                                                // prefetchable memory base
                                                temp_register = base & 0xFFFFFFF0;
                                                temp_register = (~temp_register) + 1;

                                                mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                                if (!mem_node)
                                                        return -ENOMEM;

                                                mem_node->base = save_base & (~0x0FL);
                                                mem_node->length = temp_register;

                                                mem_node->next = func->mem_head;
                                                func->mem_head = mem_node;
                                        } else
                                                return(1);
                                }
                        }       // End of base register loop
                } else if ((header_type & 0x7F) == 0x00) {        // Standard header
                        // Figure out IO and memory base lengths
                        for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &save_base);

                                temp_register = 0xFFFFFFFF;
                                pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, cloop, temp_register);

                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &base);

                                temp_register = base;

                                if (base) {       // If this register is implemented
                                        if (((base & 0x03L) == 0x01)
                                            && (save_command & 0x01)) {
                                                // IO base
                                                // set temp_register = amount of IO space requested
                                                temp_register = base & 0xFFFFFFFE;
                                                temp_register = (~temp_register) + 1;

                                                io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                                if (!io_node)
                                                        return -ENOMEM;

                                                io_node->base = save_base & (~0x01L);
                                                io_node->length = temp_register;

                                                io_node->next = func->io_head;
                                                func->io_head = io_node;
                                        } else
                                                if (((base & 0x0BL) == 0x08)
                                                    && (save_command & 0x02)) {
                                                // prefetchable memory base
                                                temp_register = base & 0xFFFFFFF0;
                                                temp_register = (~temp_register) + 1;

                                                p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                                if (!p_mem_node)
                                                        return -ENOMEM;

                                                p_mem_node->base = save_base & (~0x0FL);
                                                p_mem_node->length = temp_register;

                                                p_mem_node->next = func->p_mem_head;
                                                func->p_mem_head = p_mem_node;
                                        } else
                                                if (((base & 0x0BL) == 0x00)
                                                    && (save_command & 0x02)) {
                                                // prefetchable memory base
                                                temp_register = base & 0xFFFFFFF0;
                                                temp_register = (~temp_register) + 1;

                                                mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                                                if (!mem_node)
                                                        return -ENOMEM;

                                                mem_node->base = save_base & (~0x0FL);
                                                mem_node->length = temp_register;

                                                mem_node->next = func->mem_head;
                                                func->mem_head = mem_node;
                                        } else
                                                return(1);
                                }
                        }       // End of base register loop
                } else {          // Some other unknown header type
                }

                // find the next device in this slot
                func = cpqhp_slot_find(func->bus, func->device, index++);
        }

        return(0);
}


/*
 * cpqhp_configure_board
 *
 * Copies saved configuration information to one slot.
 * this is called recursively for bridge devices.
 * this is for hot plug REPLACE!
 *
 * returns 0 if success
 */
int cpqhp_configure_board(struct controller *ctrl, struct pci_func * func)
{
        int cloop;
        u8 header_type;
        u8 secondary_bus;
        int sub_bus;
        struct pci_func *next;
        u32 temp;
        u32 rc;
        int index = 0;

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

        while (func != NULL) {
                // Start at the top of config space so that the control
                // registers are programmed last
                for (cloop = 0x3C; cloop > 0; cloop -= 4) {
                        pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, cloop, func->config_space[cloop >> 2]);
                }

                pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_HEADER_TYPE, &header_type);

                // If this is a bridge device, restore subordinate devices
                if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {     // PCI-PCI Bridge
                        pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_SECONDARY_BUS, &secondary_bus);

                        sub_bus = (int) secondary_bus;

                        next = cpqhp_slot_list[sub_bus];

                        while (next != NULL) {
                                rc = cpqhp_configure_board(ctrl, next);

                                if (rc)
                                        return rc;

                                next = next->next;
                        }
                } else {

                        // Check all the base Address Registers to make sure
                        // they are the same.  If not, the board is different.

                        for (cloop = 16; cloop < 40; cloop += 4) {
                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &temp);

                                if (temp != func->config_space[cloop >> 2]) {
                                        dbg("Config space compare failure!!! offset = %x\n", cloop);
                                        dbg("bus = %x, device = %x, function = %x\n", func->bus, func->device, func->function);
                                        dbg("temp = %x, config space = %x\n\n", temp, func->config_space[cloop]);
                                        return 1;
                                }
                        }
                }

                func->configured = 1;

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

        return 0;
}


/*
 * cpqhp_valid_replace
 *
 * this function checks to see if a board is the same as the
 * one it is replacing.  this check will detect if the device's
 * vendor or device id's are the same
 *
 * returns 0 if the board is the same nonzero otherwise
 */
int cpqhp_valid_replace(struct controller *ctrl, struct pci_func * func)
{
        u8 cloop;
        u8 header_type;
        u8 secondary_bus;
        u8 type;
        u32 temp_register = 0;
        u32 base;
        u32 rc;
        struct pci_func *next;
        int index = 0;

        if (!func->is_a_board)
                return(ADD_NOT_SUPPORTED);

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

        while (func != NULL) {
                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_VENDOR_ID, &temp_register);

                // No adapter present
                if (temp_register == 0xFFFFFFFF)
                        return(NO_ADAPTER_PRESENT);

                if (temp_register != func->config_space[0])
                        return(ADAPTER_NOT_SAME);

                // Check for same revision number and class code
                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_CLASS_REVISION, &temp_register);

                // Adapter not the same
                if (temp_register != func->config_space[0x08 >> 2])
                        return(ADAPTER_NOT_SAME);

                // Check for Bridge
                pci_read_config_byte_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_HEADER_TYPE, &header_type);

                if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {     // PCI-PCI Bridge
                        // In order to continue checking, we must program the
                        // bus registers in the bridge to respond to accesses
                        // for it's subordinate bus(es)

                        temp_register = func->config_space[0x18 >> 2];
                        pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, PCI_PRIMARY_BUS, temp_register);

                        secondary_bus = (temp_register >> 8) & 0xFF;

                        next = cpqhp_slot_list[secondary_bus];

                        while (next != NULL) {
                                rc = cpqhp_valid_replace(ctrl, next);

                                if (rc)
                                        return(rc);

                                next = next->next;
                        }

                }
                // Check to see if it is a standard config header
                else if ((header_type & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
                        // Check subsystem vendor and ID
                        pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, PCI_SUBSYSTEM_VENDOR_ID, &temp_register);

                        if (temp_register != func->config_space[0x2C >> 2]) {
                                // If it's a SMART-2 and the register isn't filled
                                // in, ignore the difference because
                                // they just have an old rev of the firmware

                                if (!((func->config_space[0] == 0xAE100E11)
                                      && (temp_register == 0x00L)))
                                        return(ADAPTER_NOT_SAME);
                        }
                        // Figure out IO and memory base lengths
                        for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
                                temp_register = 0xFFFFFFFF;
                                pci_write_config_dword_nodev(ctrl->pci_ops, func->bus, func->device, func->function, cloop, temp_register);

                                pci_read_config_dword_nodev (ctrl->pci_ops, func->bus, func->device, func->function, cloop, &base);

                                if (base) {       // If this register is implemented
                                        if (base & 0x01L) {
                                                // IO base
                                                // set base = amount of IO space requested
                                                base = base & 0xFFFFFFFE;
                                                base = (~base) + 1;

                                                type = 1;
                                        } else {
                                                // memory base
                                                base = base & 0xFFFFFFF0;
                                                base = (~base) + 1;

                                                type = 0;
                                        }
                                } else {
                                        base = 0x0L;
                                        type = 0;
                                }

                                // Check information in slot structure
                                if (func->base_length[(cloop - 0x10) >> 2] != base)
                                        return(ADAPTER_NOT_SAME);

                                if (func->base_type[(cloop - 0x10) >> 2] != type)
                                        return(ADAPTER_NOT_SAME);

                        }       // End of base register loop

                }               // End of (type 0 config space) else
                else {
                        // this is not a type 0 or 1 config space header so
                        // we don't know how to do it
                        return(DEVICE_TYPE_NOT_SUPPORTED);
                }

                // Get the next function
                func = cpqhp_slot_find(func->bus, func->device, index++);
        }


        return(0);
}


/*
 * cpqhp_find_available_resources
 *
 * Finds available memory, IO, and IRQ resources for programming
 * devices which may be added to the system
 * this function is for hot plug ADD!
 *
 * returns 0 if success
 */  
int cpqhp_find_available_resources (struct controller *ctrl, void *rom_start)
{
        u8 temp;
        u8 populated_slot;
        u8 bridged_slot;
        void *one_slot;
        struct pci_func *func = NULL;
        int i = 10, index;
        u32 temp_dword, rc;
        struct pci_resource *mem_node;
        struct pci_resource *p_mem_node;
        struct pci_resource *io_node;
        struct pci_resource *bus_node;
        void *rom_resource_table;

        rom_resource_table = detect_HRT_floating_pointer(rom_start, rom_start+0xffff);
        dbg("rom_resource_table = %p\n", rom_resource_table);

        if (rom_resource_table == NULL) {
                return -ENODEV;
        }
        // Sum all resources and setup resource maps
        unused_IRQ = readl(rom_resource_table + UNUSED_IRQ);
        dbg("unused_IRQ = %x\n", unused_IRQ);

        temp = 0;
        while (unused_IRQ) {
                if (unused_IRQ & 1) {
                        cpqhp_disk_irq = temp;
                        break;
                }
                unused_IRQ = unused_IRQ >> 1;
                temp++;
        }

        dbg("cpqhp_disk_irq= %d\n", cpqhp_disk_irq);
        unused_IRQ = unused_IRQ >> 1;
        temp++;

        while (unused_IRQ) {
                if (unused_IRQ & 1) {
                        cpqhp_nic_irq = temp;
                        break;
                }
                unused_IRQ = unused_IRQ >> 1;
                temp++;
        }

        dbg("cpqhp_nic_irq= %d\n", cpqhp_nic_irq);
        unused_IRQ = readl(rom_resource_table + PCIIRQ);

        temp = 0;

        if (!cpqhp_nic_irq) {
                cpqhp_nic_irq = ctrl->interrupt;
        }

        if (!cpqhp_disk_irq) {
                cpqhp_disk_irq = ctrl->interrupt;
        }

        dbg("cpqhp_disk_irq, cpqhp_nic_irq= %d, %d\n", cpqhp_disk_irq, cpqhp_nic_irq);

        rc = compaq_nvram_load(rom_start, ctrl);
        if (rc)
                return rc;

        one_slot = rom_resource_table + sizeof (struct hrt);

        i = readb(rom_resource_table + NUMBER_OF_ENTRIES);
        dbg("number_of_entries = %d\n", i);

        if (!readb(one_slot + SECONDARY_BUS)) {
                return(1);
        }

        dbg("dev|IO base|length|Mem base|length|Pre base|length|PB SB MB\n");

        while (i && readb(one_slot + SECONDARY_BUS)) {
                u8 dev_func = readb(one_slot + DEV_FUNC);
                u8 primary_bus = readb(one_slot + PRIMARY_BUS);
                u8 secondary_bus = readb(one_slot + SECONDARY_BUS);
                u8 max_bus = readb(one_slot + MAX_BUS);
                u16 io_base = readw(one_slot + IO_BASE);
                u16 io_length = readw(one_slot + IO_LENGTH);
                u16 mem_base = readw(one_slot + MEM_BASE);
                u16 mem_length = readw(one_slot + MEM_LENGTH);
                u16 pre_mem_base = readw(one_slot + PRE_MEM_BASE);
                u16 pre_mem_length = readw(one_slot + PRE_MEM_LENGTH);

                dbg("%2.2x | %4.4x  | %4.4x | %4.4x   | %4.4x | %4.4x   | %4.4x |%2.2x %2.2x %2.2x\n",
                    dev_func, io_base, io_length, mem_base, mem_length, pre_mem_base, pre_mem_length,
                    primary_bus, secondary_bus, max_bus);

                // If this entry isn't for our controller's bus, ignore it
                if (primary_bus != ctrl->bus) {
                        i--;
                        one_slot += sizeof (struct slot_rt);
                        continue;
                }
                // find out if this entry is for an occupied slot
                pci_read_config_dword_nodev (ctrl->pci_ops, primary_bus, dev_func >> 3, dev_func & 0x07, PCI_VENDOR_ID, &temp_dword);

                dbg("temp_D_word = %x\n", temp_dword);

                if (temp_dword != 0xFFFFFFFF) {
                        index = 0;
                        func = cpqhp_slot_find(primary_bus, dev_func >> 3, 0);

                        while (func && (func->function != (dev_func & 0x07))) {
                                dbg("func = %p (bus, dev, fun) = (%d, %d, %d)\n", func, primary_bus, dev_func >> 3, index);
                                func = cpqhp_slot_find(primary_bus, dev_func >> 3, index++);
                        }

                        // If we can't find a match, skip this table entry
                        if (!func) {
                                i--;
                                one_slot += sizeof (struct slot_rt);
                                continue;
                        }
                        // this may not work and shouldn't be used
                        if (secondary_bus != primary_bus)
                                bridged_slot = 1;
                        else
                                bridged_slot = 0;

                        populated_slot = 1;
                } else {
                        populated_slot = 0;
                        bridged_slot = 0;
                }


                // If we've got a valid IO base, use it

                temp_dword = io_base + io_length;

                if ((io_base) && (temp_dword < 0x10000)) {
                        io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                        if (!io_node)
                                return -ENOMEM;

                        io_node->base = io_base;
                        io_node->length = io_length;

                        dbg("found io_node(base, length) = %x, %x\n", io_node->base, io_node->length);
                        dbg("populated slot =%d \n", populated_slot);
                        if (!populated_slot) {
                                io_node->next = ctrl->io_head;
                                ctrl->io_head = io_node;
                        } else {
                                io_node->next = func->io_head;
                                func->io_head = io_node;
                        }
                }

                // If we've got a valid memory base, use it
                temp_dword = mem_base + mem_length;
                if ((mem_base) && (temp_dword < 0x10000)) {
                        mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                        if (!mem_node)
                                return -ENOMEM;

                        mem_node->base = mem_base << 16;

                        mem_node->length = mem_length << 16;

                        dbg("found mem_node(base, length) = %x, %x\n", mem_node->base, mem_node->length);
                        dbg("populated slot =%d \n", populated_slot);
                        if (!populated_slot) {
                                mem_node->next = ctrl->mem_head;
                                ctrl->mem_head = mem_node;
                        } else {
                                mem_node->next = func->mem_head;
                                func->mem_head = mem_node;
                        }
                }

                // If we've got a valid prefetchable memory base, and
                // the base + length isn't greater than 0xFFFF
                temp_dword = pre_mem_base + pre_mem_length;
                if ((pre_mem_base) && (temp_dword < 0x10000)) {
                        p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                        if (!p_mem_node)
                                return -ENOMEM;

                        p_mem_node->base = pre_mem_base << 16;

                        p_mem_node->length = pre_mem_length << 16;
                        dbg("found p_mem_node(base, length) = %x, %x\n", p_mem_node->base, p_mem_node->length);
                        dbg("populated slot =%d \n", populated_slot);

                        if (!populated_slot) {
                                p_mem_node->next = ctrl->p_mem_head;
                                ctrl->p_mem_head = p_mem_node;
                        } else {
                                p_mem_node->next = func->p_mem_head;
                                func->p_mem_head = p_mem_node;
                        }
                }

                // If we've got a valid bus number, use it
                // The second condition is to ignore bus numbers on
                // populated slots that don't have PCI-PCI bridges
                if (secondary_bus && (secondary_bus != primary_bus)) {
                        bus_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
                        if (!bus_node)
                                return -ENOMEM;

                        bus_node->base = secondary_bus;
                        bus_node->length = max_bus - secondary_bus + 1;
                        dbg("found bus_node(base, length) = %x, %x\n", bus_node->base, bus_node->length);
                        dbg("populated slot =%d \n", populated_slot);
                        if (!populated_slot) {
                                bus_node->next = ctrl->bus_head;
                                ctrl->bus_head = bus_node;
                        } else {
                                bus_node->next = func->bus_head;
                                func->bus_head = bus_node;
                        }
                }

                i--;
                one_slot += sizeof (struct slot_rt);
        }

        // If all of the following fail, we don't have any resources for
        // hot plug add
        rc = 1;
        rc &= cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
        rc &= cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
        rc &= cpqhp_resource_sort_and_combine(&(ctrl->io_head));
        rc &= cpqhp_resource_sort_and_combine(&(ctrl->bus_head));

        return(rc);
}


/*
 * cpqhp_return_board_resources
 *
 * this routine returns all resources allocated to a board to
 * the available pool.
 *
 * returns 0 if success
 */
int cpqhp_return_board_resources(struct pci_func * func, struct resource_lists * resources)
{
        int rc = 0;
        struct pci_resource *node;
        struct pci_resource *t_node;
        dbg("%s\n", __FUNCTION__);

        if (!func)
                return(1);

        node = func->io_head;
        func->io_head = NULL;
        while (node) {
                t_node = node->next;
                return_resource(&(resources->io_head), node);
                node = t_node;
        }

        node = func->mem_head;
        func->mem_head = NULL;
        while (node) {
                t_node = node->next;
                return_resource(&(resources->mem_head), node);
                node = t_node;
        }

        node = func->p_mem_head;
        func->p_mem_head = NULL;
        while (node) {
                t_node = node->next;
                return_resource(&(resources->p_mem_head), node);
                node = t_node;
        }

        node = func->bus_head;
        func->bus_head = NULL;
        while (node) {
                t_node = node->next;
                return_resource(&(resources->bus_head), node);
                node = t_node;
        }

        rc |= cpqhp_resource_sort_and_combine(&(resources->mem_head));
        rc |= cpqhp_resource_sort_and_combine(&(resources->p_mem_head));
        rc |= cpqhp_resource_sort_and_combine(&(resources->io_head));
        rc |= cpqhp_resource_sort_and_combine(&(resources->bus_head));

        return(rc);
}


/*
 * cpqhp_destroy_resource_list
 *
 * Puts node back in the resource list pointed to by head
 */
void cpqhp_destroy_resource_list (struct resource_lists * resources)
{
        struct pci_resource *res, *tres;

        res = resources->io_head;
        resources->io_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }

        res = resources->mem_head;
        resources->mem_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }

        res = resources->p_mem_head;
        resources->p_mem_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }

        res = resources->bus_head;
        resources->bus_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }
}


/*
 * cpqhp_destroy_board_resources
 *
 * Puts node back in the resource list pointed to by head
 */
void cpqhp_destroy_board_resources (struct pci_func * func)
{
        struct pci_resource *res, *tres;

        res = func->io_head;
        func->io_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }

        res = func->mem_head;
        func->mem_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }

        res = func->p_mem_head;
        func->p_mem_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }

        res = func->bus_head;
        func->bus_head = NULL;

        while (res) {
                tres = res;
                res = res->next;
                kfree(tres);
        }
}