// SPDX-License-Identifier: GPL-2.0+
/*
 * IBM Hot Plug Controller Driver
 *
 * Written By: Irene Zubarev, IBM Corporation
 *
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001,2002 IBM Corp.
 *
 * All rights reserved.
 *
 * Send feedback to <gregkh@us.ibm.com>
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/init.h>
#include "ibmphp.h"

static int flags = 0;           /* for testing */

static void update_resources(struct bus_node *bus_cur, int type, int rangeno);
static int once_over(void);
static int remove_ranges(struct bus_node *, struct bus_node *);
static int update_bridge_ranges(struct bus_node **);
static int add_bus_range(int type, struct range_node *, struct bus_node *);
static void fix_resources(struct bus_node *);
static struct bus_node *find_bus_wprev(u8, struct bus_node **, u8);

static LIST_HEAD(gbuses);

static struct bus_node * __init alloc_error_bus(struct ebda_pci_rsrc *curr, u8 busno, int flag)
{
        struct bus_node *newbus;

        if (!(curr) && !(flag)) {
                err("NULL pointer passed\n");
                return NULL;
        }

        newbus = kzalloc(sizeof(struct bus_node), GFP_KERNEL);
        if (!newbus)
                return NULL;

        if (flag)
                newbus->busno = busno;
        else
                newbus->busno = curr->bus_num;
        list_add_tail(&newbus->bus_list, &gbuses);
        return newbus;
}

static struct resource_node * __init alloc_resources(struct ebda_pci_rsrc *curr)
{
        struct resource_node *rs;

        if (!curr) {
                err("NULL passed to allocate\n");
                return NULL;
        }

        rs = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
        if (!rs)
                return NULL;

        rs->busno = curr->bus_num;
        rs->devfunc = curr->dev_fun;
        rs->start = curr->start_addr;
        rs->end = curr->end_addr;
        rs->len = curr->end_addr - curr->start_addr + 1;
        return rs;
}

static int __init alloc_bus_range(struct bus_node **new_bus, struct range_node **new_range, struct ebda_pci_rsrc *curr, int flag, u8 first_bus)
{
        struct bus_node *newbus;
        struct range_node *newrange;
        u8 num_ranges = 0;

        if (first_bus) {
                newbus = kzalloc(sizeof(struct bus_node), GFP_KERNEL);
                if (!newbus)
                        return -ENOMEM;

                newbus->busno = curr->bus_num;
        } else {
                newbus = *new_bus;
                switch (flag) {
                        case MEM:
                                num_ranges = newbus->noMemRanges;
                                break;
                        case PFMEM:
                                num_ranges = newbus->noPFMemRanges;
                                break;
                        case IO:
                                num_ranges = newbus->noIORanges;
                                break;
                }
        }

        newrange = kzalloc(sizeof(struct range_node), GFP_KERNEL);
        if (!newrange) {
                if (first_bus)
                        kfree(newbus);
                return -ENOMEM;
        }
        newrange->start = curr->start_addr;
        newrange->end = curr->end_addr;

        if (first_bus || (!num_ranges))
                newrange->rangeno = 1;
        else {
                /* need to insert our range */
                add_bus_range(flag, newrange, newbus);
                debug("%d resource Primary Bus inserted on bus %x [%x - %x]\n", flag, newbus->busno, newrange->start, newrange->end);
        }

        switch (flag) {
                case MEM:
                        newbus->rangeMem = newrange;
                        if (first_bus)
                                newbus->noMemRanges = 1;
                        else {
                                debug("First Memory Primary on bus %x, [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                ++newbus->noMemRanges;
                                fix_resources(newbus);
                        }
                        break;
                case IO:
                        newbus->rangeIO = newrange;
                        if (first_bus)
                                newbus->noIORanges = 1;
                        else {
                                debug("First IO Primary on bus %x, [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                ++newbus->noIORanges;
                                fix_resources(newbus);
                        }
                        break;
                case PFMEM:
                        newbus->rangePFMem = newrange;
                        if (first_bus)
                                newbus->noPFMemRanges = 1;
                        else {
                                debug("1st PFMemory Primary on Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                ++newbus->noPFMemRanges;
                                fix_resources(newbus);
                        }

                        break;
        }

        *new_bus = newbus;
        *new_range = newrange;
        return 0;
}


/* Notes:
 * 1. The ranges are ordered.  The buses are not ordered.  (First come)
 *
 * 2. If cannot allocate out of PFMem range, allocate from Mem ranges.  PFmemFromMem
 * are not sorted. (no need since use mem node). To not change the entire code, we
 * also add mem node whenever this case happens so as not to change
 * ibmphp_check_mem_resource etc(and since it really is taking Mem resource)
 */

/*****************************************************************************
 * This is the Resource Management initialization function.  It will go through
 * the Resource list taken from EBDA and fill in this module's data structures
 *
 * THIS IS NOT TAKING INTO CONSIDERATION IO RESTRICTIONS OF PRIMARY BUSES,
 * SINCE WE'RE GOING TO ASSUME FOR NOW WE DON'T HAVE THOSE ON OUR BUSES FOR NOW
 *
 * Input: ptr to the head of the resource list from EBDA
 * Output: 0, -1 or error codes
 ***************************************************************************/
int __init ibmphp_rsrc_init(void)
{
        struct ebda_pci_rsrc *curr;
        struct range_node *newrange = NULL;
        struct bus_node *newbus = NULL;
        struct bus_node *bus_cur;
        struct bus_node *bus_prev;
        struct resource_node *new_io = NULL;
        struct resource_node *new_mem = NULL;
        struct resource_node *new_pfmem = NULL;
        int rc;

        list_for_each_entry(curr, &ibmphp_ebda_pci_rsrc_head,
                            ebda_pci_rsrc_list) {
                if (!(curr->rsrc_type & PCIDEVMASK)) {
                        /* EBDA still lists non PCI devices, so ignore... */
                        debug("this is not a PCI DEVICE in rsrc_init, please take care\n");
                        // continue;
                }

                /* this is a primary bus resource */
                if (curr->rsrc_type & PRIMARYBUSMASK) {
                        /* memory */
                        if ((curr->rsrc_type & RESTYPE) == MMASK) {
                                /* no bus structure exists in place yet */
                                if (list_empty(&gbuses)) {
                                        rc = alloc_bus_range(&newbus, &newrange, curr, MEM, 1);
                                        if (rc)
                                                return rc;
                                        list_add_tail(&newbus->bus_list, &gbuses);
                                        debug("gbuses = NULL, Memory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                } else {
                                        bus_cur = find_bus_wprev(curr->bus_num, &bus_prev, 1);
                                        /* found our bus */
                                        if (bus_cur) {
                                                rc = alloc_bus_range(&bus_cur, &newrange, curr, MEM, 0);
                                                if (rc)
                                                        return rc;
                                        } else {
                                                /* went through all the buses and didn't find ours, need to create a new bus node */
                                                rc = alloc_bus_range(&newbus, &newrange, curr, MEM, 1);
                                                if (rc)
                                                        return rc;

                                                list_add_tail(&newbus->bus_list, &gbuses);
                                                debug("New Bus, Memory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                        }
                                }
                        } else if ((curr->rsrc_type & RESTYPE) == PFMASK) {
                                /* prefetchable memory */
                                if (list_empty(&gbuses)) {
                                        /* no bus structure exists in place yet */
                                        rc = alloc_bus_range(&newbus, &newrange, curr, PFMEM, 1);
                                        if (rc)
                                                return rc;
                                        list_add_tail(&newbus->bus_list, &gbuses);
                                        debug("gbuses = NULL, PFMemory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                } else {
                                        bus_cur = find_bus_wprev(curr->bus_num, &bus_prev, 1);
                                        if (bus_cur) {
                                                /* found our bus */
                                                rc = alloc_bus_range(&bus_cur, &newrange, curr, PFMEM, 0);
                                                if (rc)
                                                        return rc;
                                        } else {
                                                /* went through all the buses and didn't find ours, need to create a new bus node */
                                                rc = alloc_bus_range(&newbus, &newrange, curr, PFMEM, 1);
                                                if (rc)
                                                        return rc;
                                                list_add_tail(&newbus->bus_list, &gbuses);
                                                debug("1st Bus, PFMemory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                        }
                                }
                        } else if ((curr->rsrc_type & RESTYPE) == IOMASK) {
                                /* IO */
                                if (list_empty(&gbuses)) {
                                        /* no bus structure exists in place yet */
                                        rc = alloc_bus_range(&newbus, &newrange, curr, IO, 1);
                                        if (rc)
                                                return rc;
                                        list_add_tail(&newbus->bus_list, &gbuses);
                                        debug("gbuses = NULL, IO Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                } else {
                                        bus_cur = find_bus_wprev(curr->bus_num, &bus_prev, 1);
                                        if (bus_cur) {
                                                rc = alloc_bus_range(&bus_cur, &newrange, curr, IO, 0);
                                                if (rc)
                                                        return rc;
                                        } else {
                                                /* went through all the buses and didn't find ours, need to create a new bus node */
                                                rc = alloc_bus_range(&newbus, &newrange, curr, IO, 1);
                                                if (rc)
                                                        return rc;
                                                list_add_tail(&newbus->bus_list, &gbuses);
                                                debug("1st Bus, IO Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
                                        }
                                }

                        } else {
                                ;       /* type is reserved  WHAT TO DO IN THIS CASE???
                                           NOTHING TO DO??? */
                        }
                } else {
                        /* regular pci device resource */
                        if ((curr->rsrc_type & RESTYPE) == MMASK) {
                                /* Memory resource */
                                new_mem = alloc_resources(curr);
                                if (!new_mem)
                                        return -ENOMEM;
                                new_mem->type = MEM;
                                /*
                                 * if it didn't find the bus, means PCI dev
                                 * came b4 the Primary Bus info, so need to
                                 * create a bus rangeno becomes a problem...
                                 * assign a -1 and then update once the range
                                 * actually appears...
                                 */
                                if (ibmphp_add_resource(new_mem) < 0) {
                                        newbus = alloc_error_bus(curr, 0, 0);
                                        if (!newbus)
                                                return -ENOMEM;
                                        newbus->firstMem = new_mem;
                                        ++newbus->needMemUpdate;
                                        new_mem->rangeno = -1;
                                }
                                debug("Memory resource for device %x, bus %x, [%x - %x]\n", new_mem->devfunc, new_mem->busno, new_mem->start, new_mem->end);

                        } else if ((curr->rsrc_type & RESTYPE) == PFMASK) {
                                /* PFMemory resource */
                                new_pfmem = alloc_resources(curr);
                                if (!new_pfmem)
                                        return -ENOMEM;
                                new_pfmem->type = PFMEM;
                                new_pfmem->fromMem = 0;
                                if (ibmphp_add_resource(new_pfmem) < 0) {
                                        newbus = alloc_error_bus(curr, 0, 0);
                                        if (!newbus)
                                                return -ENOMEM;
                                        newbus->firstPFMem = new_pfmem;
                                        ++newbus->needPFMemUpdate;
                                        new_pfmem->rangeno = -1;
                                }

                                debug("PFMemory resource for device %x, bus %x, [%x - %x]\n", new_pfmem->devfunc, new_pfmem->busno, new_pfmem->start, new_pfmem->end);
                        } else if ((curr->rsrc_type & RESTYPE) == IOMASK) {
                                /* IO resource */
                                new_io = alloc_resources(curr);
                                if (!new_io)
                                        return -ENOMEM;
                                new_io->type = IO;

                                /*
                                 * if it didn't find the bus, means PCI dev
                                 * came b4 the Primary Bus info, so need to
                                 * create a bus rangeno becomes a problem...
                                 * Can assign a -1 and then update once the
                                 * range actually appears...
                                 */
                                if (ibmphp_add_resource(new_io) < 0) {
                                        newbus = alloc_error_bus(curr, 0, 0);
                                        if (!newbus)
                                                return -ENOMEM;
                                        newbus->firstIO = new_io;
                                        ++newbus->needIOUpdate;
                                        new_io->rangeno = -1;
                                }
                                debug("IO resource for device %x, bus %x, [%x - %x]\n", new_io->devfunc, new_io->busno, new_io->start, new_io->end);
                        }
                }
        }

        list_for_each_entry(bus_cur, &gbuses, bus_list) {
                /* This is to get info about PPB resources, since EBDA doesn't put this info into the primary bus info */
                rc = update_bridge_ranges(&bus_cur);
                if (rc)
                        return rc;
        }
        return once_over();     /* This is to align ranges (so no -1) */
}

/********************************************************************************
 * This function adds a range into a sorted list of ranges per bus for a particular
 * range type, it then calls another routine to update the range numbers on the
 * pci devices' resources for the appropriate resource
 *
 * Input: type of the resource, range to add, current bus
 * Output: 0 or -1, bus and range ptrs
 ********************************************************************************/
static int add_bus_range(int type, struct range_node *range, struct bus_node *bus_cur)
{
        struct range_node *range_cur = NULL;
        struct range_node *range_prev;
        int count = 0, i_init;
        int noRanges = 0;

        switch (type) {
                case MEM:
                        range_cur = bus_cur->rangeMem;
                        noRanges = bus_cur->noMemRanges;
                        break;
                case PFMEM:
                        range_cur = bus_cur->rangePFMem;
                        noRanges = bus_cur->noPFMemRanges;
                        break;
                case IO:
                        range_cur = bus_cur->rangeIO;
                        noRanges = bus_cur->noIORanges;
                        break;
        }

        range_prev = NULL;
        while (range_cur) {
                if (range->start < range_cur->start)
                        break;
                range_prev = range_cur;
                range_cur = range_cur->next;
                count = count + 1;
        }
        if (!count) {
                /* our range will go at the beginning of the list */
                switch (type) {
                        case MEM:
                                bus_cur->rangeMem = range;
                                break;
                        case PFMEM:
                                bus_cur->rangePFMem = range;
                                break;
                        case IO:
                                bus_cur->rangeIO = range;
                                break;
                }
                range->next = range_cur;
                range->rangeno = 1;
                i_init = 0;
        } else if (!range_cur) {
                /* our range will go at the end of the list */
                range->next = NULL;
                range_prev->next = range;
                range->rangeno = range_prev->rangeno + 1;
                return 0;
        } else {
                /* the range is in the middle */
                range_prev->next = range;
                range->next = range_cur;
                range->rangeno = range_cur->rangeno;
                i_init = range_prev->rangeno;
        }

        for (count = i_init; count < noRanges; ++count) {
                ++range_cur->rangeno;
                range_cur = range_cur->next;
        }

        update_resources(bus_cur, type, i_init + 1);
        return 0;
}

/*******************************************************************************
 * This routine goes through the list of resources of type 'type' and updates
 * the range numbers that they correspond to.  It was called from add_bus_range fnc
 *
 * Input: bus, type of the resource, the rangeno starting from which to update
 ******************************************************************************/
static void update_resources(struct bus_node *bus_cur, int type, int rangeno)
{
        struct resource_node *res = NULL;
        u8 eol = 0;     /* end of list indicator */

        switch (type) {
                case MEM:
                        if (bus_cur->firstMem)
                                res = bus_cur->firstMem;
                        break;
                case PFMEM:
                        if (bus_cur->firstPFMem)
                                res = bus_cur->firstPFMem;
                        break;
                case IO:
                        if (bus_cur->firstIO)
                                res = bus_cur->firstIO;
                        break;
        }

        if (res) {
                while (res) {
                        if (res->rangeno == rangeno)
                                break;
                        if (res->next)
                                res = res->next;
                        else if (res->nextRange)
                                res = res->nextRange;
                        else {
                                eol = 1;
                                break;
                        }
                }

                if (!eol) {
                        /* found the range */
                        while (res) {
                                ++res->rangeno;
                                res = res->next;
                        }
                }
        }
}

static void fix_me(struct resource_node *res, struct bus_node *bus_cur, struct range_node *range)
{
        char *str = "";
        switch (res->type) {
                case IO:
                        str = "io";
                        break;
                case MEM:
                        str = "mem";
                        break;
                case PFMEM:
                        str = "pfmem";
                        break;
        }

        while (res) {
                if (res->rangeno == -1) {
                        while (range) {
                                if ((res->start >= range->start) && (res->end <= range->end)) {
                                        res->rangeno = range->rangeno;
                                        debug("%s->rangeno in fix_resources is %d\n", str, res->rangeno);
                                        switch (res->type) {
                                                case IO:
                                                        --bus_cur->needIOUpdate;
                                                        break;
                                                case MEM:
                                                        --bus_cur->needMemUpdate;
                                                        break;
                                                case PFMEM:
                                                        --bus_cur->needPFMemUpdate;
                                                        break;
                                        }
                                        break;
                                }
                                range = range->next;
                        }
                }
                if (res->next)
                        res = res->next;
                else
                        res = res->nextRange;
        }

}

/*****************************************************************************
 * This routine reassigns the range numbers to the resources that had a -1
 * This case can happen only if upon initialization, resources taken by pci dev
 * appear in EBDA before the resources allocated for that bus, since we don't
 * know the range, we assign -1, and this routine is called after a new range
 * is assigned to see the resources with unknown range belong to the added range
 *
 * Input: current bus
 * Output: none, list of resources for that bus are fixed if can be
 *******************************************************************************/
static void fix_resources(struct bus_node *bus_cur)
{
        struct range_node *range;
        struct resource_node *res;

        debug("%s - bus_cur->busno = %d\n", __func__, bus_cur->busno);

        if (bus_cur->needIOUpdate) {
                res = bus_cur->firstIO;
                range = bus_cur->rangeIO;
                fix_me(res, bus_cur, range);
        }
        if (bus_cur->needMemUpdate) {
                res = bus_cur->firstMem;
                range = bus_cur->rangeMem;
                fix_me(res, bus_cur, range);
        }
        if (bus_cur->needPFMemUpdate) {
                res = bus_cur->firstPFMem;
                range = bus_cur->rangePFMem;
                fix_me(res, bus_cur, range);
        }
}

/*******************************************************************************
 * This routine adds a resource to the list of resources to the appropriate bus
 * based on their resource type and sorted by their starting addresses.  It assigns
 * the ptrs to next and nextRange if needed.
 *
 * Input: resource ptr
 * Output: ptrs assigned (to the node)
 * 0 or -1
 *******************************************************************************/
int ibmphp_add_resource(struct resource_node *res)
{
        struct resource_node *res_cur;
        struct resource_node *res_prev;
        struct bus_node *bus_cur;
        struct range_node *range_cur = NULL;
        struct resource_node *res_start = NULL;

        debug("%s - enter\n", __func__);

        if (!res) {
                err("NULL passed to add\n");
                return -ENODEV;
        }

        bus_cur = find_bus_wprev(res->busno, NULL, 0);

        if (!bus_cur) {
                /* didn't find a bus, something's wrong!!! */
                debug("no bus in the system, either pci_dev's wrong or allocation failed\n");
                return -ENODEV;
        }

        /* Normal case */
        switch (res->type) {
                case IO:
                        range_cur = bus_cur->rangeIO;
                        res_start = bus_cur->firstIO;
                        break;
                case MEM:
                        range_cur = bus_cur->rangeMem;
                        res_start = bus_cur->firstMem;
                        break;
                case PFMEM:
                        range_cur = bus_cur->rangePFMem;
                        res_start = bus_cur->firstPFMem;
                        break;
                default:
                        err("cannot read the type of the resource to add... problem\n");
                        return -EINVAL;
        }
        while (range_cur) {
                if ((res->start >= range_cur->start) && (res->end <= range_cur->end)) {
                        res->rangeno = range_cur->rangeno;
                        break;
                }
                range_cur = range_cur->next;
        }

        /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
         * this is again the case of rangeno = -1
         * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
         */

        if (!range_cur) {
                switch (res->type) {
                        case IO:
                                ++bus_cur->needIOUpdate;
                                break;
                        case MEM:
                                ++bus_cur->needMemUpdate;
                                break;
                        case PFMEM:
                                ++bus_cur->needPFMemUpdate;
                                break;
                }
                res->rangeno = -1;
        }

        debug("The range is %d\n", res->rangeno);
        if (!res_start) {
                /* no first{IO,Mem,Pfmem} on the bus, 1st IO/Mem/Pfmem resource ever */
                switch (res->type) {
                        case IO:
                                bus_cur->firstIO = res;
                                break;
                        case MEM:
                                bus_cur->firstMem = res;
                                break;
                        case PFMEM:
                                bus_cur->firstPFMem = res;
                                break;
                }
                res->next = NULL;
                res->nextRange = NULL;
        } else {
                res_cur = res_start;
                res_prev = NULL;

                debug("res_cur->rangeno is %d\n", res_cur->rangeno);

                while (res_cur) {
                        if (res_cur->rangeno >= res->rangeno)
                                break;
                        res_prev = res_cur;
                        if (res_cur->next)
                                res_cur = res_cur->next;
                        else
                                res_cur = res_cur->nextRange;
                }

                if (!res_cur) {
                        /* at the end of the resource list */
                        debug("i should be here, [%x - %x]\n", res->start, res->end);
                        res_prev->nextRange = res;
                        res->next = NULL;
                        res->nextRange = NULL;
                } else if (res_cur->rangeno == res->rangeno) {
                        /* in the same range */
                        while (res_cur) {
                                if (res->start < res_cur->start)
                                        break;
                                res_prev = res_cur;
                                res_cur = res_cur->next;
                        }
                        if (!res_cur) {
                                /* the last resource in this range */
                                res_prev->next = res;
                                res->next = NULL;
                                res->nextRange = res_prev->nextRange;
                                res_prev->nextRange = NULL;
                        } else if (res->start < res_cur->start) {
                                /* at the beginning or middle of the range */
                                if (!res_prev)  {
                                        switch (res->type) {
                                                case IO:
                                                        bus_cur->firstIO = res;
                                                        break;
                                                case MEM:
                                                        bus_cur->firstMem = res;
                                                        break;
                                                case PFMEM:
                                                        bus_cur->firstPFMem = res;
                                                        break;
                                        }
                                } else if (res_prev->rangeno == res_cur->rangeno)
                                        res_prev->next = res;
                                else
                                        res_prev->nextRange = res;

                                res->next = res_cur;
                                res->nextRange = NULL;
                        }
                } else {
                        /* this is the case where it is 1st occurrence of the range */
                        if (!res_prev) {
                                /* at the beginning of the resource list */
                                res->next = NULL;
                                switch (res->type) {
                                        case IO:
                                                res->nextRange = bus_cur->firstIO;
                                                bus_cur->firstIO = res;
                                                break;
                                        case MEM:
                                                res->nextRange = bus_cur->firstMem;
                                                bus_cur->firstMem = res;
                                                break;
                                        case PFMEM:
                                                res->nextRange = bus_cur->firstPFMem;
                                                bus_cur->firstPFMem = res;
                                                break;
                                }
                        } else if (res_cur->rangeno > res->rangeno) {
                                /* in the middle of the resource list */
                                res_prev->nextRange = res;
                                res->next = NULL;
                                res->nextRange = res_cur;
                        }
                }
        }

        debug("%s - exit\n", __func__);
        return 0;
}

/****************************************************************************
 * This routine will remove the resource from the list of resources
 *
 * Input: io, mem, and/or pfmem resource to be deleted
 * Output: modified resource list
 *        0 or error code
 ****************************************************************************/
int ibmphp_remove_resource(struct resource_node *res)
{
        struct bus_node *bus_cur;
        struct resource_node *res_cur = NULL;
        struct resource_node *res_prev;
        struct resource_node *mem_cur;
        char *type = "";

        if (!res)  {
                err("resource to remove is NULL\n");
                return -ENODEV;
        }

        bus_cur = find_bus_wprev(res->busno, NULL, 0);

        if (!bus_cur) {
                err("cannot find corresponding bus of the io resource to remove  bailing out...\n");
                return -ENODEV;
        }

        switch (res->type) {
                case IO:
                        res_cur = bus_cur->firstIO;
                        type = "io";
                        break;
                case MEM:
                        res_cur = bus_cur->firstMem;
                        type = "mem";
                        break;
                case PFMEM:
                        res_cur = bus_cur->firstPFMem;
                        type = "pfmem";
                        break;
                default:
                        err("unknown type for resource to remove\n");
                        return -EINVAL;
        }
        res_prev = NULL;

        while (res_cur) {
                if ((res_cur->start == res->start) && (res_cur->end == res->end))
                        break;
                res_prev = res_cur;
                if (res_cur->next)
                        res_cur = res_cur->next;
                else
                        res_cur = res_cur->nextRange;
        }

        if (!res_cur) {
                if (res->type == PFMEM) {
                        /*
                         * case where pfmem might be in the PFMemFromMem list
                         * so will also need to remove the corresponding mem
                         * entry
                         */
                        res_cur = bus_cur->firstPFMemFromMem;
                        res_prev = NULL;

                        while (res_cur) {
                                if ((res_cur->start == res->start) && (res_cur->end == res->end)) {
                                        mem_cur = bus_cur->firstMem;
                                        while (mem_cur) {
                                                if ((mem_cur->start == res_cur->start)
                                                    && (mem_cur->end == res_cur->end))
                                                        break;
                                                if (mem_cur->next)
                                                        mem_cur = mem_cur->next;
                                                else
                                                        mem_cur = mem_cur->nextRange;
                                        }
                                        if (!mem_cur) {
                                                err("cannot find corresponding mem node for pfmem...\n");
                                                return -EINVAL;
                                        }

                                        ibmphp_remove_resource(mem_cur);
                                        if (!res_prev)
                                                bus_cur->firstPFMemFromMem = res_cur->next;
                                        else
                                                res_prev->next = res_cur->next;
                                        kfree(res_cur);
                                        return 0;
                                }
                                res_prev = res_cur;
                                if (res_cur->next)
                                        res_cur = res_cur->next;
                                else
                                        res_cur = res_cur->nextRange;
                        }
                        if (!res_cur) {
                                err("cannot find pfmem to delete...\n");
                                return -EINVAL;
                        }
                } else {
                        err("the %s resource is not in the list to be deleted...\n", type);
                        return -EINVAL;
                }
        }
        if (!res_prev) {
                /* first device to be deleted */
                if (res_cur->next) {
                        switch (res->type) {
                                case IO:
                                        bus_cur->firstIO = res_cur->next;
                                        break;
                                case MEM:
                                        bus_cur->firstMem = res_cur->next;
                                        break;
                                case PFMEM:
                                        bus_cur->firstPFMem = res_cur->next;
                                        break;
                        }
                } else if (res_cur->nextRange) {
                        switch (res->type) {
                                case IO:
                                        bus_cur->firstIO = res_cur->nextRange;
                                        break;
                                case MEM:
                                        bus_cur->firstMem = res_cur->nextRange;
                                        break;
                                case PFMEM:
                                        bus_cur->firstPFMem = res_cur->nextRange;
                                        break;
                        }
                } else {
                        switch (res->type) {
                                case IO:
                                        bus_cur->firstIO = NULL;
                                        break;
                                case MEM:
                                        bus_cur->firstMem = NULL;
                                        break;
                                case PFMEM:
                                        bus_cur->firstPFMem = NULL;
                                        break;
                        }
                }
                kfree(res_cur);
                return 0;
        } else {
                if (res_cur->next) {
                        if (res_prev->rangeno == res_cur->rangeno)
                                res_prev->next = res_cur->next;
                        else
                                res_prev->nextRange = res_cur->next;
                } else if (res_cur->nextRange) {
                        res_prev->next = NULL;
                        res_prev->nextRange = res_cur->nextRange;
                } else {
                        res_prev->next = NULL;
                        res_prev->nextRange = NULL;
                }
                kfree(res_cur);
                return 0;
        }

        return 0;
}

static struct range_node *find_range(struct bus_node *bus_cur, struct resource_node *res)
{
        struct range_node *range = NULL;

        switch (res->type) {
                case IO:
                        range = bus_cur->rangeIO;
                        break;
                case MEM:
                        range = bus_cur->rangeMem;
                        break;
                case PFMEM:
                        range = bus_cur->rangePFMem;
                        break;
                default:
                        err("cannot read resource type in find_range\n");
        }

        while (range) {
                if (res->rangeno == range->rangeno)
                        break;
                range = range->next;
        }
        return range;
}

/*****************************************************************************
 * This routine will check to make sure the io/mem/pfmem->len that the device asked for
 * can fit w/i our list of available IO/MEM/PFMEM resources.  If cannot, returns -EINVAL,
 * otherwise, returns 0
 *
 * Input: resource
 * Output: the correct start and end address are inputted into the resource node,
 *        0 or -EINVAL
 *****************************************************************************/
int ibmphp_check_resource(struct resource_node *res, u8 bridge)
{
        struct bus_node *bus_cur;
        struct range_node *range = NULL;
        struct resource_node *res_prev;
        struct resource_node *res_cur = NULL;
        u32 len_cur = 0, start_cur = 0, len_tmp = 0;
        int noranges = 0;
        u32 tmp_start;          /* this is to make sure start address is divisible by the length needed */
        u32 tmp_divide;
        u8 flag = 0;

        if (!res)
                return -EINVAL;

        if (bridge) {
                /* The rules for bridges are different, 4K divisible for IO, 1M for (pf)mem*/
                if (res->type == IO)
                        tmp_divide = IOBRIDGE;
                else
                        tmp_divide = MEMBRIDGE;
        } else
                tmp_divide = res->len;

        bus_cur = find_bus_wprev(res->busno, NULL, 0);

        if (!bus_cur) {
                /* didn't find a bus, something's wrong!!! */
                debug("no bus in the system, either pci_dev's wrong or allocation failed\n");
                return -EINVAL;
        }

        debug("%s - enter\n", __func__);
        debug("bus_cur->busno is %d\n", bus_cur->busno);

        /* This is a quick fix to not mess up with the code very much.  i.e.,
         * 2000-2fff, len = 1000, but when we compare, we need it to be fff */
        res->len -= 1;

        switch (res->type) {
                case IO:
                        res_cur = bus_cur->firstIO;
                        noranges = bus_cur->noIORanges;
                        break;
                case MEM:
                        res_cur = bus_cur->firstMem;
                        noranges = bus_cur->noMemRanges;
                        break;
                case PFMEM:

                        res_cur = bus_cur->firstPFMem;
                        noranges = bus_cur->noPFMemRanges;
                        break;
                default:
                        err("wrong type of resource to check\n");
                        return -EINVAL;
        }
        res_prev = NULL;

        while (res_cur) {
                range = find_range(bus_cur, res_cur);
                debug("%s - rangeno = %d\n", __func__, res_cur->rangeno);

                if (!range) {
                        err("no range for the device exists... bailing out...\n");
                        return -EINVAL;
                }

                /* found our range */
                if (!res_prev) {
                        /* first time in the loop */
                        len_tmp = res_cur->start - 1 - range->start;

                        if ((res_cur->start != range->start) && (len_tmp >= res->len)) {
                                debug("len_tmp = %x\n", len_tmp);

                                if ((len_tmp < len_cur) || (len_cur == 0)) {

                                        if ((range->start % tmp_divide) == 0) {
                                                /* just perfect, starting address is divisible by length */
                                                flag = 1;
                                                len_cur = len_tmp;
                                                start_cur = range->start;
                                        } else {
                                                /* Needs adjusting */
                                                tmp_start = range->start;
                                                flag = 0;

                                                while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
                                                        if ((tmp_start % tmp_divide) == 0) {
                                                                flag = 1;
                                                                len_cur = len_tmp;
                                                                start_cur = tmp_start;
                                                                break;
                                                        }
                                                        tmp_start += tmp_divide - tmp_start % tmp_divide;
                                                        if (tmp_start >= res_cur->start - 1)
                                                                break;
                                                }
                                        }

                                        if (flag && len_cur == res->len) {
                                                debug("but we are not here, right?\n");
                                                res->start = start_cur;
                                                res->len += 1; /* To restore the balance */
                                                res->end = res->start + res->len - 1;
                                                return 0;
                                        }
                                }
                        }
                }
                if (!res_cur->next) {
                        /* last device on the range */
                        len_tmp = range->end - (res_cur->end + 1);

                        if ((range->end != res_cur->end) && (len_tmp >= res->len)) {
                                debug("len_tmp = %x\n", len_tmp);
                                if ((len_tmp < len_cur) || (len_cur == 0)) {

                                        if (((res_cur->end + 1) % tmp_divide) == 0) {
                                                /* just perfect, starting address is divisible by length */
                                                flag = 1;
                                                len_cur = len_tmp;
                                                start_cur = res_cur->end + 1;
                                        } else {
                                                /* Needs adjusting */
                                                tmp_start = res_cur->end + 1;
                                                flag = 0;

                                                while ((len_tmp = range->end - tmp_start) >= res->len) {
                                                        if ((tmp_start % tmp_divide) == 0) {
                                                                flag = 1;
                                                                len_cur = len_tmp;
                                                                start_cur = tmp_start;
                                                                break;
                                                        }
                                                        tmp_start += tmp_divide - tmp_start % tmp_divide;
                                                        if (tmp_start >= range->end)
                                                                break;
                                                }
                                        }
                                        if (flag && len_cur == res->len) {
                                                res->start = start_cur;
                                                res->len += 1; /* To restore the balance */
                                                res->end = res->start + res->len - 1;
                                                return 0;
                                        }
                                }
                        }
                }

                if (res_prev) {
                        if (res_prev->rangeno != res_cur->rangeno) {
                                /* 1st device on this range */
                                len_tmp = res_cur->start - 1 - range->start;

                                if ((res_cur->start != range->start) && (len_tmp >= res->len)) {
                                        if ((len_tmp < len_cur) || (len_cur == 0)) {
                                                if ((range->start % tmp_divide) == 0) {
                                                        /* just perfect, starting address is divisible by length */
                                                        flag = 1;
                                                        len_cur = len_tmp;
                                                        start_cur = range->start;
                                                } else {
                                                        /* Needs adjusting */
                                                        tmp_start = range->start;
                                                        flag = 0;

                                                        while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
                                                                if ((tmp_start % tmp_divide) == 0) {
                                                                        flag = 1;
                                                                        len_cur = len_tmp;
                                                                        start_cur = tmp_start;
                                                                        break;
                                                                }
                                                                tmp_start += tmp_divide - tmp_start % tmp_divide;
                                                                if (tmp_start >= res_cur->start - 1)
                                                                        break;
                                                        }
                                                }

                                                if (flag && len_cur == res->len) {
                                                        res->start = start_cur;
                                                        res->len += 1; /* To restore the balance */
                                                        res->end = res->start + res->len - 1;
                                                        return 0;
                                                }
                                        }
                                }
                        } else {
                                /* in the same range */
                                len_tmp = res_cur->start - 1 - res_prev->end - 1;

                                if (len_tmp >= res->len) {
                                        if ((len_tmp < len_cur) || (len_cur == 0)) {
                                                if (((res_prev->end + 1) % tmp_divide) == 0) {
                                                        /* just perfect, starting address's divisible by length */
                                                        flag = 1;
                                                        len_cur = len_tmp;
                                                        start_cur = res_prev->end + 1;
                                                } else {
                                                        /* Needs adjusting */
                                                        tmp_start = res_prev->end + 1;
                                                        flag = 0;

                                                        while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
                                                                if ((tmp_start % tmp_divide) == 0) {
                                                                        flag = 1;
                                                                        len_cur = len_tmp;
                                                                        start_cur = tmp_start;
                                                                        break;
                                                                }
                                                                tmp_start += tmp_divide - tmp_start % tmp_divide;
                                                                if (tmp_start >= res_cur->start - 1)
                                                                        break;
                                                        }
                                                }

                                                if (flag && len_cur == res->len) {
                                                        res->start = start_cur;
                                                        res->len += 1; /* To restore the balance */
                                                        res->end = res->start + res->len - 1;
                                                        return 0;
                                                }
                                        }
                                }
                        }
                }
                /* end if (res_prev) */
                res_prev = res_cur;
                if (res_cur->next)
                        res_cur = res_cur->next;
                else
                        res_cur = res_cur->nextRange;
        }       /* end of while */


        if (!res_prev) {
                /* 1st device ever */
                /* need to find appropriate range */
                switch (res->type) {
                        case IO:
                                range = bus_cur->rangeIO;
                                break;
                        case MEM:
                                range = bus_cur->rangeMem;
                                break;
                        case PFMEM:
                                range = bus_cur->rangePFMem;
                                break;
                }
                while (range) {
                        len_tmp = range->end - range->start;

                        if (len_tmp >= res->len) {
                                if ((len_tmp < len_cur) || (len_cur == 0)) {
                                        if ((range->start % tmp_divide) == 0) {
                                                /* just perfect, starting address's divisible by length */
                                                flag = 1;
                                                len_cur = len_tmp;
                                                start_cur = range->start;
                                        } else {
                                                /* Needs adjusting */
                                                tmp_start = range->start;
                                                flag = 0;

                                                while ((len_tmp = range->end - tmp_start) >= res->len) {
                                                        if ((tmp_start % tmp_divide) == 0) {
                                                                flag = 1;
                                                                len_cur = len_tmp;
                                                                start_cur = tmp_start;
                                                                break;
                                                        }
                                                        tmp_start += tmp_divide - tmp_start % tmp_divide;
                                                        if (tmp_start >= range->end)
                                                                break;
                                                }
                                        }

                                        if (flag && len_cur == res->len) {
                                                res->start = start_cur;
                                                res->len += 1; /* To restore the balance */
                                                res->end = res->start + res->len - 1;
                                                return 0;
                                        }
                                }
                        }
                        range = range->next;
                }               /* end of while */

                if ((!range) && (len_cur == 0)) {
                        /* have gone through the list of devices and ranges and haven't found n.e.thing */
                        err("no appropriate range.. bailing out...\n");
                        return -EINVAL;
                } else if (len_cur) {
                        res->start = start_cur;
                        res->len += 1; /* To restore the balance */
                        res->end = res->start + res->len - 1;
                        return 0;
                }
        }

        if (!res_cur) {
                debug("prev->rangeno = %d, noranges = %d\n", res_prev->rangeno, noranges);
                if (res_prev->rangeno < noranges) {
                        /* if there're more ranges out there to check */
                        switch (res->type) {
                                case IO:
                                        range = bus_cur->rangeIO;
                                        break;
                                case MEM:
                                        range = bus_cur->rangeMem;
                                        break;
                                case PFMEM:
                                        range = bus_cur->rangePFMem;
                                        break;
                        }
                        while (range) {
                                len_tmp = range->end - range->start;

                                if (len_tmp >= res->len) {
                                        if ((len_tmp < len_cur) || (len_cur == 0)) {
                                                if ((range->start % tmp_divide) == 0) {
                                                        /* just perfect, starting address's divisible by length */
                                                        flag = 1;
                                                        len_cur = len_tmp;
                                                        start_cur = range->start;
                                                } else {
                                                        /* Needs adjusting */
                                                        tmp_start = range->start;
                                                        flag = 0;

                                                        while ((len_tmp = range->end - tmp_start) >= res->len) {
                                                                if ((tmp_start % tmp_divide) == 0) {
                                                                        flag = 1;
                                                                        len_cur = len_tmp;
                                                                        start_cur = tmp_start;
                                                                        break;
                                                                }
                                                                tmp_start += tmp_divide - tmp_start % tmp_divide;
                                                                if (tmp_start >= range->end)
                                                                        break;
                                                        }
                                                }

                                                if (flag && len_cur == res->len) {
                                                        res->start = start_cur;
                                                        res->len += 1; /* To restore the balance */
                                                        res->end = res->start + res->len - 1;
                                                        return 0;
                                                }
                                        }
                                }
                                range = range->next;
                        }       /* end of while */

                        if ((!range) && (len_cur == 0)) {
                                /* have gone through the list of devices and ranges and haven't found n.e.thing */
                                err("no appropriate range.. bailing out...\n");
                                return -EINVAL;
                        } else if (len_cur) {
                                res->start = start_cur;
                                res->len += 1; /* To restore the balance */
                                res->end = res->start + res->len - 1;
                                return 0;
                        }
                } else {
                        /* no more ranges to check on */
                        if (len_cur) {
                                res->start = start_cur;
                                res->len += 1; /* To restore the balance */
                                res->end = res->start + res->len - 1;
                                return 0;
                        } else {
                                /* have gone through the list of devices and haven't found n.e.thing */
                                err("no appropriate range.. bailing out...\n");
                                return -EINVAL;
                        }
                }
        }       /* end if (!res_cur) */
        return -EINVAL;
}

/********************************************************************************
 * This routine is called from remove_card if the card contained PPB.
 * It will remove all the resources on the bus as well as the bus itself
 * Input: Bus
 * Output: 0, -ENODEV
 ********************************************************************************/
int ibmphp_remove_bus(struct bus_node *bus, u8 parent_busno)
{
        struct resource_node *res_cur;
        struct resource_node *res_tmp;
        struct bus_node *prev_bus;
        int rc;

        prev_bus = find_bus_wprev(parent_busno, NULL, 0);

        if (!prev_bus) {
                debug("something terribly wrong. Cannot find parent bus to the one to remove\n");
                return -ENODEV;
        }

        debug("In ibmphp_remove_bus... prev_bus->busno is %x\n", prev_bus->busno);

        rc = remove_ranges(bus, prev_bus);
        if (rc)
                return rc;

        if (bus->firstIO) {
                res_cur = bus->firstIO;
                while (res_cur) {
                        res_tmp = res_cur;
                        if (res_cur->next)
                                res_cur = res_cur->next;
                        else
                                res_cur = res_cur->nextRange;
                        kfree(res_tmp);
                        res_tmp = NULL;
                }
                bus->firstIO = NULL;
        }
        if (bus->firstMem) {
                res_cur = bus->firstMem;
                while (res_cur) {
                        res_tmp = res_cur;
                        if (res_cur->next)
                                res_cur = res_cur->next;
                        else
                                res_cur = res_cur->nextRange;
                        kfree(res_tmp);
                        res_tmp = NULL;
                }
                bus->firstMem = NULL;
        }
        if (bus->firstPFMem) {
                res_cur = bus->firstPFMem;
                while (res_cur) {
                        res_tmp = res_cur;
                        if (res_cur->next)
                                res_cur = res_cur->next;
                        else
                                res_cur = res_cur->nextRange;
                        kfree(res_tmp);
                        res_tmp = NULL;
                }
                bus->firstPFMem = NULL;
        }

        if (bus->firstPFMemFromMem) {
                res_cur = bus->firstPFMemFromMem;
                while (res_cur) {
                        res_tmp = res_cur;
                        res_cur = res_cur->next;

                        kfree(res_tmp);
                        res_tmp = NULL;
                }
                bus->firstPFMemFromMem = NULL;
        }

        list_del(&bus->bus_list);
        kfree(bus);
        return 0;
}

/******************************************************************************
 * This routine deletes the ranges from a given bus, and the entries from the
 * parent's bus in the resources
 * Input: current bus, previous bus
 * Output: 0, -EINVAL
 ******************************************************************************/
static int remove_ranges(struct bus_node *bus_cur, struct bus_node *bus_prev)
{
        struct range_node *range_cur;
        struct range_node *range_tmp;
        int i;
        struct resource_node *res = NULL;

        if (bus_cur->noIORanges) {
                range_cur = bus_cur->rangeIO;
                for (i = 0; i < bus_cur->noIORanges; i++) {
                        if (ibmphp_find_resource(bus_prev, range_cur->start, &res, IO) < 0)
                                return -EINVAL;
                        ibmphp_remove_resource(res);

                        range_tmp = range_cur;
                        range_cur = range_cur->next;
                        kfree(range_tmp);
                        range_tmp = NULL;
                }
                bus_cur->rangeIO = NULL;
        }
        if (bus_cur->noMemRanges) {
                range_cur = bus_cur->rangeMem;
                for (i = 0; i < bus_cur->noMemRanges; i++) {
                        if (ibmphp_find_resource(bus_prev, range_cur->start, &res, MEM) < 0)
                                return -EINVAL;

                        ibmphp_remove_resource(res);
                        range_tmp = range_cur;
                        range_cur = range_cur->next;
                        kfree(range_tmp);
                        range_tmp = NULL;
                }
                bus_cur->rangeMem = NULL;
        }
        if (bus_cur->noPFMemRanges) {
                range_cur = bus_cur->rangePFMem;
                for (i = 0; i < bus_cur->noPFMemRanges; i++) {
                        if (ibmphp_find_resource(bus_prev, range_cur->start, &res, PFMEM) < 0)
                                return -EINVAL;

                        ibmphp_remove_resource(res);
                        range_tmp = range_cur;
                        range_cur = range_cur->next;
                        kfree(range_tmp);
                        range_tmp = NULL;
                }
                bus_cur->rangePFMem = NULL;
        }
        return 0;
}

/*
 * find the resource node in the bus
 * Input: Resource needed, start address of the resource, type of resource
 */
int ibmphp_find_resource(struct bus_node *bus, u32 start_address, struct resource_node **res, int flag)
{
        struct resource_node *res_cur = NULL;
        char *type = "";

        if (!bus) {
                err("The bus passed in NULL to find resource\n");
                return -ENODEV;
        }

        switch (flag) {
                case IO:
                        res_cur = bus->firstIO;
                        type = "io";
                        break;
                case MEM:
                        res_cur = bus->firstMem;
                        type = "mem";
                        break;
                case PFMEM:
                        res_cur = bus->firstPFMem;
                        type = "pfmem";
                        break;
                default:
                        err("wrong type of flag\n");
                        return -EINVAL;
        }

        while (res_cur) {
                if (res_cur->start == start_address) {
                        *res = res_cur;
                        break;
                }
                if (res_cur->next)
                        res_cur = res_cur->next;
                else
                        res_cur = res_cur->nextRange;
        }

        if (!res_cur) {
                if (flag == PFMEM) {
                        res_cur = bus->firstPFMemFromMem;
                        while (res_cur) {
                                if (res_cur->start == start_address) {
                                        *res = res_cur;
                                        break;
                                }
                                res_cur = res_cur->next;
                        }
                        if (!res_cur) {
                                debug("SOS...cannot find %s resource in the bus.\n", type);
                                return -EINVAL;
                        }
                } else {
                        debug("SOS... cannot find %s resource in the bus.\n", type);
                        return -EINVAL;
                }
        }

        if (*res)
                debug("*res->start = %x\n", (*res)->start);

        return 0;
}

/***********************************************************************
 * This routine will free the resource structures used by the
 * system.  It is called from cleanup routine for the module
 * Parameters: none
 * Returns: none
 ***********************************************************************/
void ibmphp_free_resources(void)
{
        struct bus_node *bus_cur = NULL, *next;
        struct bus_node *bus_tmp;
        struct range_node *range_cur;
        struct range_node *range_tmp;
        struct resource_node *res_cur;
        struct resource_node *res_tmp;
        int i = 0;
        flags = 1;

        list_for_each_entry_safe(bus_cur, next, &gbuses, bus_list) {
                if (bus_cur->noIORanges) {
                        range_cur = bus_cur->rangeIO;
                        for (i = 0; i < bus_cur->noIORanges; i++) {
                                if (!range_cur)
                                        break;
                                range_tmp = range_cur;
                                range_cur = range_cur->next;
                                kfree(range_tmp);
                                range_tmp = NULL;
                        }
                }
                if (bus_cur->noMemRanges) {
                        range_cur = bus_cur->rangeMem;
                        for (i = 0; i < bus_cur->noMemRanges; i++) {
                                if (!range_cur)
                                        break;
                                range_tmp = range_cur;
                                range_cur = range_cur->next;
                                kfree(range_tmp);
                                range_tmp = NULL;
                        }
                }
                if (bus_cur->noPFMemRanges) {
                        range_cur = bus_cur->rangePFMem;
                        for (i = 0; i < bus_cur->noPFMemRanges; i++) {
                                if (!range_cur)
                                        break;
                                range_tmp = range_cur;
                                range_cur = range_cur->next;
                                kfree(range_tmp);
                                range_tmp = NULL;
                        }
                }

                if (bus_cur->firstIO) {
                        res_cur = bus_cur->firstIO;
                        while (res_cur) {
                                res_tmp = res_cur;
                                if (res_cur->next)
                                        res_cur = res_cur->next;
                                else
                                        res_cur = res_cur->nextRange;
                                kfree(res_tmp);
                                res_tmp = NULL;
                        }
                        bus_cur->firstIO = NULL;
                }
                if (bus_cur->firstMem) {
                        res_cur = bus_cur->firstMem;
                        while (res_cur) {
                                res_tmp = res_cur;
                                if (res_cur->next)
                                        res_cur = res_cur->next;
                                else
                                        res_cur = res_cur->nextRange;
                                kfree(res_tmp);
                                res_tmp = NULL;
                        }
                        bus_cur->firstMem = NULL;
                }
                if (bus_cur->firstPFMem) {
                        res_cur = bus_cur->firstPFMem;
                        while (res_cur) {
                                res_tmp = res_cur;
                                if (res_cur->next)
                                        res_cur = res_cur->next;
                                else
                                        res_cur = res_cur->nextRange;
                                kfree(res_tmp);
                                res_tmp = NULL;
                        }
                        bus_cur->firstPFMem = NULL;
                }

                if (bus_cur->firstPFMemFromMem) {
                        res_cur = bus_cur->firstPFMemFromMem;
                        while (res_cur) {
                                res_tmp = res_cur;
                                res_cur = res_cur->next;

                                kfree(res_tmp);
                                res_tmp = NULL;
                        }
                        bus_cur->firstPFMemFromMem = NULL;
                }

                bus_tmp = bus_cur;
                list_del(&bus_cur->bus_list);
                kfree(bus_tmp);
                bus_tmp = NULL;
        }
}

/*********************************************************************************
 * This function will go over the PFmem resources to check if the EBDA allocated
 * pfmem out of memory buckets of the bus.  If so, it will change the range numbers
 * and a flag to indicate that this resource is out of memory. It will also move the
 * Pfmem out of the pfmem resource list to the PFMemFromMem list, and will create
 * a new Mem node
 * This routine is called right after initialization
 *******************************************************************************/
static int __init once_over(void)
{
        struct resource_node *pfmem_cur;
        struct resource_node *pfmem_prev;
        struct resource_node *mem;
        struct bus_node *bus_cur;

        list_for_each_entry(bus_cur, &gbuses, bus_list) {
                if ((!bus_cur->rangePFMem) && (bus_cur->firstPFMem)) {
                        for (pfmem_cur = bus_cur->firstPFMem, pfmem_prev = NULL; pfmem_cur; pfmem_prev = pfmem_cur, pfmem_cur = pfmem_cur->next) {
                                pfmem_cur->fromMem = 1;
                                if (pfmem_prev)
                                        pfmem_prev->next = pfmem_cur->next;
                                else
                                        bus_cur->firstPFMem = pfmem_cur->next;

                                if (!bus_cur->firstPFMemFromMem)
                                        pfmem_cur->next = NULL;
                                else
                                        /* we don't need to sort PFMemFromMem since we're using mem node for
                                           all the real work anyways, so just insert at the beginning of the
                                           list
                                         */
                                        pfmem_cur->next = bus_cur->firstPFMemFromMem;

                                bus_cur->firstPFMemFromMem = pfmem_cur;

                                mem = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
                                if (!mem)
                                        return -ENOMEM;

                                mem->type = MEM;
                                mem->busno = pfmem_cur->busno;
                                mem->devfunc = pfmem_cur->devfunc;
                                mem->start = pfmem_cur->start;
                                mem->end = pfmem_cur->end;
                                mem->len = pfmem_cur->len;
                                if (ibmphp_add_resource(mem) < 0)
                                        err("Trouble...trouble... EBDA allocated pfmem from mem, but system doesn't display it has this space... unless not PCI device...\n");
                                pfmem_cur->rangeno = mem->rangeno;
                        }       /* end for pfmem */
                }       /* end if */
        }       /* end list_for_each bus */
        return 0;
}

int ibmphp_add_pfmem_from_mem(struct resource_node *pfmem)
{
        struct bus_node *bus_cur = find_bus_wprev(pfmem->busno, NULL, 0);

        if (!bus_cur) {
                err("cannot find bus of pfmem to add...\n");
                return -ENODEV;
        }

        if (bus_cur->firstPFMemFromMem)
                pfmem->next = bus_cur->firstPFMemFromMem;
        else
                pfmem->next = NULL;

        bus_cur->firstPFMemFromMem = pfmem;

        return 0;
}

/* This routine just goes through the buses to see if the bus already exists.
 * It is called from ibmphp_find_sec_number, to find out a secondary bus number for
 * bridged cards
 * Parameters: bus_number
 * Returns: Bus pointer or NULL
 */
struct bus_node *ibmphp_find_res_bus(u8 bus_number)
{
        return find_bus_wprev(bus_number, NULL, 0);
}

static struct bus_node *find_bus_wprev(u8 bus_number, struct bus_node **prev, u8 flag)
{
        struct bus_node *bus_cur;

        list_for_each_entry(bus_cur, &gbuses, bus_list) {
                if (flag)
                        *prev = list_prev_entry(bus_cur, bus_list);
                if (bus_cur->busno == bus_number)
                        return bus_cur;
        }

        return NULL;
}

void ibmphp_print_test(void)
{
        int i = 0;
        struct bus_node *bus_cur = NULL;
        struct range_node *range;
        struct resource_node *res;

        debug_pci("*****************START**********************\n");

        if ((!list_empty(&gbuses)) && flags) {
                err("The GBUSES is not NULL?!?!?!?!?\n");
                return;
        }

        list_for_each_entry(bus_cur, &gbuses, bus_list) {
                debug_pci ("This is bus # %d.  There are\n", bus_cur->busno);
                debug_pci ("IORanges = %d\t", bus_cur->noIORanges);
                debug_pci ("MemRanges = %d\t", bus_cur->noMemRanges);
                debug_pci ("PFMemRanges = %d\n", bus_cur->noPFMemRanges);
                debug_pci ("The IO Ranges are as follows:\n");
                if (bus_cur->rangeIO) {
                        range = bus_cur->rangeIO;
                        for (i = 0; i < bus_cur->noIORanges; i++) {
                                debug_pci("rangeno is %d\n", range->rangeno);
                                debug_pci("[%x - %x]\n", range->start, range->end);
                                range = range->next;
                        }
                }

                debug_pci("The Mem Ranges are as follows:\n");
                if (bus_cur->rangeMem) {
                        range = bus_cur->rangeMem;
                        for (i = 0; i < bus_cur->noMemRanges; i++) {
                                debug_pci("rangeno is %d\n", range->rangeno);
                                debug_pci("[%x - %x]\n", range->start, range->end);
                                range = range->next;
                        }
                }

                debug_pci("The PFMem Ranges are as follows:\n");

                if (bus_cur->rangePFMem) {
                        range = bus_cur->rangePFMem;
                        for (i = 0; i < bus_cur->noPFMemRanges; i++) {
                                debug_pci("rangeno is %d\n", range->rangeno);
                                debug_pci("[%x - %x]\n", range->start, range->end);
                                range = range->next;
                        }
                }

                debug_pci("The resources on this bus are as follows\n");

                debug_pci("IO...\n");
                if (bus_cur->firstIO) {
                        res = bus_cur->firstIO;
                        while (res) {
                                debug_pci("The range # is %d\n", res->rangeno);
                                debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
                                debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
                                if (res->next)
                                        res = res->next;
                                else if (res->nextRange)
                                        res = res->nextRange;
                                else
                                        break;
                        }
                }
                debug_pci("Mem...\n");
                if (bus_cur->firstMem) {
                        res = bus_cur->firstMem;
                        while (res) {
                                debug_pci("The range # is %d\n", res->rangeno);
                                debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
                                debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
                                if (res->next)
                                        res = res->next;
                                else if (res->nextRange)
                                        res = res->nextRange;
                                else
                                        break;
                        }
                }
                debug_pci("PFMem...\n");
                if (bus_cur->firstPFMem) {
                        res = bus_cur->firstPFMem;
                        while (res) {
                                debug_pci("The range # is %d\n", res->rangeno);
                                debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
                                debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
                                if (res->next)
                                        res = res->next;
                                else if (res->nextRange)
                                        res = res->nextRange;
                                else
                                        break;
                        }
                }

                debug_pci("PFMemFromMem...\n");
                if (bus_cur->firstPFMemFromMem) {
                        res = bus_cur->firstPFMemFromMem;
                        while (res) {
                                debug_pci("The range # is %d\n", res->rangeno);
                                debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
                                debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
                                res = res->next;
                        }
                }
        }
        debug_pci("***********************END***********************\n");
}

static int range_exists_already(struct range_node *range, struct bus_node *bus_cur, u8 type)
{
        struct range_node *range_cur = NULL;
        switch (type) {
                case IO:
                        range_cur = bus_cur->rangeIO;
                        break;
                case MEM:
                        range_cur = bus_cur->rangeMem;
                        break;
                case PFMEM:
                        range_cur = bus_cur->rangePFMem;
                        break;
                default:
                        err("wrong type passed to find out if range already exists\n");
                        return -ENODEV;
        }

        while (range_cur) {
                if ((range_cur->start == range->start) && (range_cur->end == range->end))
                        return 1;
                range_cur = range_cur->next;
        }

        return 0;
}

/* This routine will read the windows for any PPB we have and update the
 * range info for the secondary bus, and will also input this info into
 * primary bus, since BIOS doesn't. This is for PPB that are in the system
 * on bootup.  For bridged cards that were added during previous load of the
 * driver, only the ranges and the bus structure are added, the devices are
 * added from NVRAM
 * Input: primary busno
 * Returns: none
 * Note: this function doesn't take into account IO restrictions etc,
 *       so will only work for bridges with no video/ISA devices behind them It
 *       also will not work for onboard PPBs that can have more than 1 *bus
 *       behind them All these are TO DO.
 *       Also need to add more error checkings... (from fnc returns etc)
 */
static int __init update_bridge_ranges(struct bus_node **bus)
{
        u8 sec_busno, device, function, hdr_type, start_io_address, end_io_address;
        u16 vendor_id, upper_io_start, upper_io_end, start_mem_address, end_mem_address;
        u32 start_address, end_address, upper_start, upper_end;
        struct bus_node *bus_sec;
        struct bus_node *bus_cur;
        struct resource_node *io;
        struct resource_node *mem;
        struct resource_node *pfmem;
        struct range_node *range;
        unsigned int devfn;

        bus_cur = *bus;
        if (!bus_cur)
                return -ENODEV;
        ibmphp_pci_bus->number = bus_cur->busno;

        debug("inside %s\n", __func__);
        debug("bus_cur->busno = %x\n", bus_cur->busno);

        for (device = 0; device < 32; device++) {
                for (function = 0x00; function < 0x08; function++) {
                        devfn = PCI_DEVFN(device, function);
                        pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);

                        if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
                                /* found correct device!!! */
                                pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);

                                switch (hdr_type) {
                                        case PCI_HEADER_TYPE_NORMAL:
                                                function = 0x8;
                                                break;
                                        case PCI_HEADER_TYPE_MULTIDEVICE:
                                                break;
                                        case PCI_HEADER_TYPE_BRIDGE:
                                                function = 0x8;
                                                fallthrough;
                                        case PCI_HEADER_TYPE_MULTIBRIDGE:
                                                /* We assume here that only 1 bus behind the bridge
                                                   TO DO: add functionality for several:
                                                   temp = secondary;
                                                   while (temp < subordinate) {
                                                   ...
                                                   temp++;
                                                   }
                                                 */
                                                pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_busno);
                                                bus_sec = find_bus_wprev(sec_busno, NULL, 0);
                                                /* this bus structure doesn't exist yet, PPB was configured during previous loading of ibmphp */
                                                if (!bus_sec) {
                                                        bus_sec = alloc_error_bus(NULL, sec_busno, 1);
                                                        /* the rest will be populated during NVRAM call */
                                                        return 0;
                                                }
                                                pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &start_io_address);
                                                pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &end_io_address);
                                                pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, &upper_io_start);
                                                pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, &upper_io_end);
                                                start_address = (start_io_address & PCI_IO_RANGE_MASK) << 8;
                                                start_address |= (upper_io_start << 16);
                                                end_address = (end_io_address & PCI_IO_RANGE_MASK) << 8;
                                                end_address |= (upper_io_end << 16);

                                                if ((start_address) && (start_address <= end_address)) {
                                                        range = kzalloc(sizeof(struct range_node), GFP_KERNEL);
                                                        if (!range)
                                                                return -ENOMEM;

                                                        range->start = start_address;
                                                        range->end = end_address + 0xfff;

                                                        if (bus_sec->noIORanges > 0) {
                                                                if (!range_exists_already(range, bus_sec, IO)) {
                                                                        add_bus_range(IO, range, bus_sec);
                                                                        ++bus_sec->noIORanges;
                                                                } else {
                                                                        kfree(range);
                                                                        range = NULL;
                                                                }
                                                        } else {
                                                                /* 1st IO Range on the bus */
                                                                range->rangeno = 1;
                                                                bus_sec->rangeIO = range;
                                                                ++bus_sec->noIORanges;
                                                        }
                                                        fix_resources(bus_sec);

                                                        if (ibmphp_find_resource(bus_cur, start_address, &io, IO)) {
                                                                io = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
                                                                if (!io) {
                                                                        kfree(range);
                                                                        return -ENOMEM;
                                                                }

                                                                io->type = IO;
                                                                io->busno = bus_cur->busno;
                                                                io->devfunc = ((device << 3) | (function & 0x7));
                                                                io->start = start_address;
                                                                io->end = end_address + 0xfff;
                                                                io->len = io->end - io->start + 1;
                                                                ibmphp_add_resource(io);
                                                        }
                                                }

                                                pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &start_mem_address);
                                                pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &end_mem_address);

                                                start_address = 0x00000000 | (start_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
                                                end_address = 0x00000000 | (end_mem_address & PCI_MEMORY_RANGE_MASK) << 16;

                                                if ((start_address) && (start_address <= end_address)) {

                                                        range = kzalloc(sizeof(struct range_node), GFP_KERNEL);
                                                        if (!range)
                                                                return -ENOMEM;

                                                        range->start = start_address;
                                                        range->end = end_address + 0xfffff;

                                                        if (bus_sec->noMemRanges > 0) {
                                                                if (!range_exists_already(range, bus_sec, MEM)) {
                                                                        add_bus_range(MEM, range, bus_sec);
                                                                        ++bus_sec->noMemRanges;
                                                                } else {
                                                                        kfree(range);
                                                                        range = NULL;
                                                                }
                                                        } else {
                                                                /* 1st Mem Range on the bus */
                                                                range->rangeno = 1;
                                                                bus_sec->rangeMem = range;
                                                                ++bus_sec->noMemRanges;
                                                        }

                                                        fix_resources(bus_sec);

                                                        if (ibmphp_find_resource(bus_cur, start_address, &mem, MEM)) {
                                                                mem = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
                                                                if (!mem) {
                                                                        kfree(range);
                                                                        return -ENOMEM;
                                                                }
                                                                mem->type = MEM;
                                                                mem->busno = bus_cur->busno;
                                                                mem->devfunc = ((device << 3) | (function & 0x7));
                                                                mem->start = start_address;
                                                                mem->end = end_address + 0xfffff;
                                                                mem->len = mem->end - mem->start + 1;
                                                                ibmphp_add_resource(mem);
                                                        }
                                                }
                                                pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &start_mem_address);
                                                pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &end_mem_address);
                                                pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, &upper_start);
                                                pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, &upper_end);
                                                start_address = 0x00000000 | (start_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
                                                end_address = 0x00000000 | (end_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
#if BITS_PER_LONG == 64
                                                start_address |= ((long) upper_start) << 32;
                                                end_address |= ((long) upper_end) << 32;
#endif

                                                if ((start_address) && (start_address <= end_address)) {

                                                        range = kzalloc(sizeof(struct range_node), GFP_KERNEL);
                                                        if (!range)
                                                                return -ENOMEM;

                                                        range->start = start_address;
                                                        range->end = end_address + 0xfffff;

                                                        if (bus_sec->noPFMemRanges > 0) {
                                                                if (!range_exists_already(range, bus_sec, PFMEM)) {
                                                                        add_bus_range(PFMEM, range, bus_sec);
                                                                        ++bus_sec->noPFMemRanges;
                                                                } else {
                                                                        kfree(range);
                                                                        range = NULL;
                                                                }
                                                        } else {
                                                                /* 1st PFMem Range on the bus */
                                                                range->rangeno = 1;
                                                                bus_sec->rangePFMem = range;
                                                                ++bus_sec->noPFMemRanges;
                                                        }

                                                        fix_resources(bus_sec);
                                                        if (ibmphp_find_resource(bus_cur, start_address, &pfmem, PFMEM)) {
                                                                pfmem = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
                                                                if (!pfmem) {
                                                                        kfree(range);
                                                                        return -ENOMEM;
                                                                }
                                                                pfmem->type = PFMEM;
                                                                pfmem->busno = bus_cur->busno;
                                                                pfmem->devfunc = ((device << 3) | (function & 0x7));
                                                                pfmem->start = start_address;
                                                                pfmem->end = end_address + 0xfffff;
                                                                pfmem->len = pfmem->end - pfmem->start + 1;
                                                                pfmem->fromMem = 0;

                                                                ibmphp_add_resource(pfmem);
                                                        }
                                                }
                                                break;
                                }       /* end of switch */
                        }       /* end if vendor */
                }       /* end for function */
        }       /* end for device */

        bus = &bus_cur;
        return 0;
}