linux/drivers/pci/hotplug/ibmphp_core.c
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   1/*
   2 * IBM Hot Plug Controller Driver
   3 *
   4 * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
   5 *
   6 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
   7 * Copyright (C) 2001-2003 IBM Corp.
   8 *
   9 * All rights reserved.
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or (at
  14 * your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful, but
  17 * WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19 * NON INFRINGEMENT.  See the GNU General Public License for more
  20 * details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 *
  26 * Send feedback to <gregkh@us.ibm.com>
  27 *
  28 */
  29
  30#include <linux/init.h>
  31#include <linux/module.h>
  32#include <linux/slab.h>
  33#include <linux/pci.h>
  34#include <linux/interrupt.h>
  35#include <linux/delay.h>
  36#include <linux/wait.h>
  37#include "../pci.h"
  38#include <asm/pci_x86.h>                /* for struct irq_routing_table */
  39#include <asm/io_apic.h>
  40#include "ibmphp.h"
  41
  42#define attn_on(sl)  ibmphp_hpc_writeslot (sl, HPC_SLOT_ATTNON)
  43#define attn_off(sl) ibmphp_hpc_writeslot (sl, HPC_SLOT_ATTNOFF)
  44#define attn_LED_blink(sl) ibmphp_hpc_writeslot (sl, HPC_SLOT_BLINKLED)
  45#define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot (sl, READ_REVLEVEL, rev)
  46#define get_hpc_options(sl, opt) ibmphp_hpc_readslot (sl, READ_HPCOPTIONS, opt)
  47
  48#define DRIVER_VERSION  "0.6"
  49#define DRIVER_DESC     "IBM Hot Plug PCI Controller Driver"
  50
  51int ibmphp_debug;
  52
  53static bool debug;
  54module_param(debug, bool, S_IRUGO | S_IWUSR);
  55MODULE_PARM_DESC (debug, "Debugging mode enabled or not");
  56MODULE_LICENSE ("GPL");
  57MODULE_DESCRIPTION (DRIVER_DESC);
  58
  59struct pci_bus *ibmphp_pci_bus;
  60static int max_slots;
  61
  62static int irqs[16];    /* PIC mode IRQs we're using so far (in case MPS
  63                         * tables don't provide default info for empty slots */
  64
  65static int init_flag;
  66
  67/*
  68static int get_max_adapter_speed_1 (struct hotplug_slot *, u8 *, u8);
  69
  70static inline int get_max_adapter_speed (struct hotplug_slot *hs, u8 *value)
  71{
  72        return get_max_adapter_speed_1 (hs, value, 1);
  73}
  74*/
  75static inline int get_cur_bus_info(struct slot **sl)
  76{
  77        int rc = 1;
  78        struct slot *slot_cur = *sl;
  79
  80        debug("options = %x\n", slot_cur->ctrl->options);
  81        debug("revision = %x\n", slot_cur->ctrl->revision);
  82
  83        if (READ_BUS_STATUS(slot_cur->ctrl))
  84                rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
  85
  86        if (rc)
  87                return rc;
  88
  89        slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
  90        if (READ_BUS_MODE(slot_cur->ctrl))
  91                slot_cur->bus_on->current_bus_mode =
  92                                CURRENT_BUS_MODE(slot_cur->busstatus);
  93        else
  94                slot_cur->bus_on->current_bus_mode = 0xFF;
  95
  96        debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
  97                        slot_cur->busstatus,
  98                        slot_cur->bus_on->current_speed,
  99                        slot_cur->bus_on->current_bus_mode);
 100
 101        *sl = slot_cur;
 102        return 0;
 103}
 104
 105static inline int slot_update(struct slot **sl)
 106{
 107        int rc;
 108        rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
 109        if (rc)
 110                return rc;
 111        if (!init_flag)
 112                rc = get_cur_bus_info(sl);
 113        return rc;
 114}
 115
 116static int __init get_max_slots (void)
 117{
 118        struct slot *slot_cur;
 119        struct list_head *tmp;
 120        u8 slot_count = 0;
 121
 122        list_for_each(tmp, &ibmphp_slot_head) {
 123                slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
 124                /* sometimes the hot-pluggable slots start with 4 (not always from 1) */
 125                slot_count = max(slot_count, slot_cur->number);
 126        }
 127        return slot_count;
 128}
 129
 130/* This routine will put the correct slot->device information per slot.  It's
 131 * called from initialization of the slot structures. It will also assign
 132 * interrupt numbers per each slot.
 133 * Parameters: struct slot
 134 * Returns 0 or errors
 135 */
 136int ibmphp_init_devno(struct slot **cur_slot)
 137{
 138        struct irq_routing_table *rtable;
 139        int len;
 140        int loop;
 141        int i;
 142
 143        rtable = pcibios_get_irq_routing_table();
 144        if (!rtable) {
 145                err("no BIOS routing table...\n");
 146                return -ENOMEM;
 147        }
 148
 149        len = (rtable->size - sizeof(struct irq_routing_table)) /
 150                        sizeof(struct irq_info);
 151
 152        if (!len) {
 153                kfree(rtable);
 154                return -1;
 155        }
 156        for (loop = 0; loop < len; loop++) {
 157                if ((*cur_slot)->number == rtable->slots[loop].slot &&
 158                    (*cur_slot)->bus == rtable->slots[loop].bus) {
 159                        (*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
 160                        for (i = 0; i < 4; i++)
 161                                (*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
 162                                                (int) (*cur_slot)->device, i);
 163
 164                        debug("(*cur_slot)->irq[0] = %x\n",
 165                                        (*cur_slot)->irq[0]);
 166                        debug("(*cur_slot)->irq[1] = %x\n",
 167                                        (*cur_slot)->irq[1]);
 168                        debug("(*cur_slot)->irq[2] = %x\n",
 169                                        (*cur_slot)->irq[2]);
 170                        debug("(*cur_slot)->irq[3] = %x\n",
 171                                        (*cur_slot)->irq[3]);
 172
 173                        debug("rtable->exclusive_irqs = %x\n",
 174                                        rtable->exclusive_irqs);
 175                        debug("rtable->slots[loop].irq[0].bitmap = %x\n",
 176                                        rtable->slots[loop].irq[0].bitmap);
 177                        debug("rtable->slots[loop].irq[1].bitmap = %x\n",
 178                                        rtable->slots[loop].irq[1].bitmap);
 179                        debug("rtable->slots[loop].irq[2].bitmap = %x\n",
 180                                        rtable->slots[loop].irq[2].bitmap);
 181                        debug("rtable->slots[loop].irq[3].bitmap = %x\n",
 182                                        rtable->slots[loop].irq[3].bitmap);
 183
 184                        debug("rtable->slots[loop].irq[0].link = %x\n",
 185                                        rtable->slots[loop].irq[0].link);
 186                        debug("rtable->slots[loop].irq[1].link = %x\n",
 187                                        rtable->slots[loop].irq[1].link);
 188                        debug("rtable->slots[loop].irq[2].link = %x\n",
 189                                        rtable->slots[loop].irq[2].link);
 190                        debug("rtable->slots[loop].irq[3].link = %x\n",
 191                                        rtable->slots[loop].irq[3].link);
 192                        debug("end of init_devno\n");
 193                        kfree(rtable);
 194                        return 0;
 195                }
 196        }
 197
 198        kfree(rtable);
 199        return -1;
 200}
 201
 202static inline int power_on(struct slot *slot_cur)
 203{
 204        u8 cmd = HPC_SLOT_ON;
 205        int retval;
 206
 207        retval = ibmphp_hpc_writeslot(slot_cur, cmd);
 208        if (retval) {
 209                err("power on failed\n");
 210                return retval;
 211        }
 212        if (CTLR_RESULT(slot_cur->ctrl->status)) {
 213                err("command not completed successfully in power_on\n");
 214                return -EIO;
 215        }
 216        msleep(3000);   /* For ServeRAID cards, and some 66 PCI */
 217        return 0;
 218}
 219
 220static inline int power_off(struct slot *slot_cur)
 221{
 222        u8 cmd = HPC_SLOT_OFF;
 223        int retval;
 224
 225        retval = ibmphp_hpc_writeslot(slot_cur, cmd);
 226        if (retval) {
 227                err("power off failed\n");
 228                return retval;
 229        }
 230        if (CTLR_RESULT(slot_cur->ctrl->status)) {
 231                err("command not completed successfully in power_off\n");
 232                retval = -EIO;
 233        }
 234        return retval;
 235}
 236
 237static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
 238{
 239        int rc = 0;
 240        struct slot *pslot;
 241        u8 cmd = 0x00;     /* avoid compiler warning */
 242
 243        debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
 244                        (ulong) hotplug_slot, value);
 245        ibmphp_lock_operations();
 246
 247
 248        if (hotplug_slot) {
 249                switch (value) {
 250                case HPC_SLOT_ATTN_OFF:
 251                        cmd = HPC_SLOT_ATTNOFF;
 252                        break;
 253                case HPC_SLOT_ATTN_ON:
 254                        cmd = HPC_SLOT_ATTNON;
 255                        break;
 256                case HPC_SLOT_ATTN_BLINK:
 257                        cmd = HPC_SLOT_BLINKLED;
 258                        break;
 259                default:
 260                        rc = -ENODEV;
 261                        err("set_attention_status - Error : invalid input [%x]\n",
 262                                        value);
 263                        break;
 264                }
 265                if (rc == 0) {
 266                        pslot = hotplug_slot->private;
 267                        if (pslot)
 268                                rc = ibmphp_hpc_writeslot(pslot, cmd);
 269                        else
 270                                rc = -ENODEV;
 271                }
 272        } else
 273                rc = -ENODEV;
 274
 275        ibmphp_unlock_operations();
 276
 277        debug("set_attention_status - Exit rc[%d]\n", rc);
 278        return rc;
 279}
 280
 281static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 282{
 283        int rc = -ENODEV;
 284        struct slot *pslot;
 285        struct slot myslot;
 286
 287        debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
 288                                        (ulong) hotplug_slot, (ulong) value);
 289
 290        ibmphp_lock_operations();
 291        if (hotplug_slot) {
 292                pslot = hotplug_slot->private;
 293                if (pslot) {
 294                        memcpy(&myslot, pslot, sizeof(struct slot));
 295                        rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
 296                                                &(myslot.status));
 297                        if (!rc)
 298                                rc = ibmphp_hpc_readslot(pslot,
 299                                                READ_EXTSLOTSTATUS,
 300                                                &(myslot.ext_status));
 301                        if (!rc)
 302                                *value = SLOT_ATTN(myslot.status,
 303                                                myslot.ext_status);
 304                }
 305        }
 306
 307        ibmphp_unlock_operations();
 308        debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
 309        return rc;
 310}
 311
 312static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 313{
 314        int rc = -ENODEV;
 315        struct slot *pslot;
 316        struct slot myslot;
 317
 318        debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
 319                                        (ulong) hotplug_slot, (ulong) value);
 320        ibmphp_lock_operations();
 321        if (hotplug_slot) {
 322                pslot = hotplug_slot->private;
 323                if (pslot) {
 324                        memcpy(&myslot, pslot, sizeof(struct slot));
 325                        rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
 326                                                &(myslot.status));
 327                        if (!rc)
 328                                *value = SLOT_LATCH(myslot.status);
 329                }
 330        }
 331
 332        ibmphp_unlock_operations();
 333        debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
 334                        rc, rc, *value);
 335        return rc;
 336}
 337
 338
 339static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 340{
 341        int rc = -ENODEV;
 342        struct slot *pslot;
 343        struct slot myslot;
 344
 345        debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
 346                                        (ulong) hotplug_slot, (ulong) value);
 347        ibmphp_lock_operations();
 348        if (hotplug_slot) {
 349                pslot = hotplug_slot->private;
 350                if (pslot) {
 351                        memcpy(&myslot, pslot, sizeof(struct slot));
 352                        rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
 353                                                &(myslot.status));
 354                        if (!rc)
 355                                *value = SLOT_PWRGD(myslot.status);
 356                }
 357        }
 358
 359        ibmphp_unlock_operations();
 360        debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
 361                        rc, rc, *value);
 362        return rc;
 363}
 364
 365static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
 366{
 367        int rc = -ENODEV;
 368        struct slot *pslot;
 369        u8 present;
 370        struct slot myslot;
 371
 372        debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
 373                                        (ulong) hotplug_slot, (ulong) value);
 374        ibmphp_lock_operations();
 375        if (hotplug_slot) {
 376                pslot = hotplug_slot->private;
 377                if (pslot) {
 378                        memcpy(&myslot, pslot, sizeof(struct slot));
 379                        rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
 380                                                &(myslot.status));
 381                        if (!rc) {
 382                                present = SLOT_PRESENT(myslot.status);
 383                                if (present == HPC_SLOT_EMPTY)
 384                                        *value = 0;
 385                                else
 386                                        *value = 1;
 387                        }
 388                }
 389        }
 390
 391        ibmphp_unlock_operations();
 392        debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
 393        return rc;
 394}
 395
 396static int get_max_bus_speed(struct slot *slot)
 397{
 398        int rc;
 399        u8 mode = 0;
 400        enum pci_bus_speed speed;
 401        struct pci_bus *bus = slot->hotplug_slot->pci_slot->bus;
 402
 403        debug("%s - Entry slot[%p]\n", __func__, slot);
 404
 405        ibmphp_lock_operations();
 406        mode = slot->supported_bus_mode;
 407        speed = slot->supported_speed;
 408        ibmphp_unlock_operations();
 409
 410        switch (speed) {
 411        case BUS_SPEED_33:
 412                break;
 413        case BUS_SPEED_66:
 414                if (mode == BUS_MODE_PCIX)
 415                        speed += 0x01;
 416                break;
 417        case BUS_SPEED_100:
 418        case BUS_SPEED_133:
 419                speed += 0x01;
 420                break;
 421        default:
 422                /* Note (will need to change): there would be soon 256, 512 also */
 423                rc = -ENODEV;
 424        }
 425
 426        if (!rc)
 427                bus->max_bus_speed = speed;
 428
 429        debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
 430        return rc;
 431}
 432
 433/*
 434static int get_max_adapter_speed_1(struct hotplug_slot *hotplug_slot, u8 *value, u8 flag)
 435{
 436        int rc = -ENODEV;
 437        struct slot *pslot;
 438        struct slot myslot;
 439
 440        debug("get_max_adapter_speed_1 - Entry hotplug_slot[%lx] pvalue[%lx]\n",
 441                                                (ulong)hotplug_slot, (ulong) value);
 442
 443        if (flag)
 444                ibmphp_lock_operations();
 445
 446        if (hotplug_slot && value) {
 447                pslot = hotplug_slot->private;
 448                if (pslot) {
 449                        memcpy(&myslot, pslot, sizeof(struct slot));
 450                        rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
 451                                                &(myslot.status));
 452
 453                        if (!(SLOT_LATCH (myslot.status)) &&
 454                                        (SLOT_PRESENT (myslot.status))) {
 455                                rc = ibmphp_hpc_readslot(pslot,
 456                                                READ_EXTSLOTSTATUS,
 457                                                &(myslot.ext_status));
 458                                if (!rc)
 459                                        *value = SLOT_SPEED(myslot.ext_status);
 460                        } else
 461                                *value = MAX_ADAPTER_NONE;
 462                }
 463        }
 464
 465        if (flag)
 466                ibmphp_unlock_operations();
 467
 468        debug("get_max_adapter_speed_1 - Exit rc[%d] value[%x]\n", rc, *value);
 469        return rc;
 470}
 471
 472static int get_bus_name(struct hotplug_slot *hotplug_slot, char *value)
 473{
 474        int rc = -ENODEV;
 475        struct slot *pslot = NULL;
 476
 477        debug("get_bus_name - Entry hotplug_slot[%lx]\n", (ulong)hotplug_slot);
 478
 479        ibmphp_lock_operations();
 480
 481        if (hotplug_slot) {
 482                pslot = hotplug_slot->private;
 483                if (pslot) {
 484                        rc = 0;
 485                        snprintf(value, 100, "Bus %x", pslot->bus);
 486                }
 487        } else
 488                rc = -ENODEV;
 489
 490        ibmphp_unlock_operations();
 491        debug("get_bus_name - Exit rc[%d] value[%x]\n", rc, *value);
 492        return rc;
 493}
 494*/
 495
 496/****************************************************************************
 497 * This routine will initialize the ops data structure used in the validate
 498 * function. It will also power off empty slots that are powered on since BIOS
 499 * leaves those on, albeit disconnected
 500 ****************************************************************************/
 501static int __init init_ops(void)
 502{
 503        struct slot *slot_cur;
 504        struct list_head *tmp;
 505        int retval;
 506        int rc;
 507
 508        list_for_each(tmp, &ibmphp_slot_head) {
 509                slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
 510
 511                if (!slot_cur)
 512                        return -ENODEV;
 513
 514                debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
 515                                                        slot_cur->number);
 516                if (slot_cur->ctrl->revision == 0xFF)
 517                        if (get_ctrl_revision(slot_cur,
 518                                                &slot_cur->ctrl->revision))
 519                                return -1;
 520
 521                if (slot_cur->bus_on->current_speed == 0xFF)
 522                        if (get_cur_bus_info(&slot_cur))
 523                                return -1;
 524                get_max_bus_speed(slot_cur);
 525
 526                if (slot_cur->ctrl->options == 0xFF)
 527                        if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
 528                                return -1;
 529
 530                retval = slot_update(&slot_cur);
 531                if (retval)
 532                        return retval;
 533
 534                debug("status = %x\n", slot_cur->status);
 535                debug("ext_status = %x\n", slot_cur->ext_status);
 536                debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
 537                debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
 538                debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
 539
 540                if ((SLOT_PWRGD(slot_cur->status)) &&
 541                    !(SLOT_PRESENT(slot_cur->status)) &&
 542                    !(SLOT_LATCH(slot_cur->status))) {
 543                        debug("BEFORE POWER OFF COMMAND\n");
 544                                rc = power_off(slot_cur);
 545                                if (rc)
 546                                        return rc;
 547
 548        /*              retval = slot_update(&slot_cur);
 549         *              if (retval)
 550         *                      return retval;
 551         *              ibmphp_update_slot_info(slot_cur);
 552         */
 553                }
 554        }
 555        init_flag = 0;
 556        return 0;
 557}
 558
 559/* This operation will check whether the slot is within the bounds and
 560 * the operation is valid to perform on that slot
 561 * Parameters: slot, operation
 562 * Returns: 0 or error codes
 563 */
 564static int validate(struct slot *slot_cur, int opn)
 565{
 566        int number;
 567        int retval;
 568
 569        if (!slot_cur)
 570                return -ENODEV;
 571        number = slot_cur->number;
 572        if ((number > max_slots) || (number < 0))
 573                return -EBADSLT;
 574        debug("slot_number in validate is %d\n", slot_cur->number);
 575
 576        retval = slot_update(&slot_cur);
 577        if (retval)
 578                return retval;
 579
 580        switch (opn) {
 581                case ENABLE:
 582                        if (!(SLOT_PWRGD(slot_cur->status)) &&
 583                             (SLOT_PRESENT(slot_cur->status)) &&
 584                             !(SLOT_LATCH(slot_cur->status)))
 585                                return 0;
 586                        break;
 587                case DISABLE:
 588                        if ((SLOT_PWRGD(slot_cur->status)) &&
 589                            (SLOT_PRESENT(slot_cur->status)) &&
 590                            !(SLOT_LATCH(slot_cur->status)))
 591                                return 0;
 592                        break;
 593                default:
 594                        break;
 595        }
 596        err("validate failed....\n");
 597        return -EINVAL;
 598}
 599
 600/****************************************************************************
 601 * This routine is for updating the data structures in the hotplug core
 602 * Parameters: struct slot
 603 * Returns: 0 or error
 604 ****************************************************************************/
 605int ibmphp_update_slot_info(struct slot *slot_cur)
 606{
 607        struct hotplug_slot_info *info;
 608        struct pci_bus *bus = slot_cur->hotplug_slot->pci_slot->bus;
 609        int rc;
 610        u8 bus_speed;
 611        u8 mode;
 612
 613        info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
 614        if (!info) {
 615                err("out of system memory\n");
 616                return -ENOMEM;
 617        }
 618
 619        info->power_status = SLOT_PWRGD(slot_cur->status);
 620        info->attention_status = SLOT_ATTN(slot_cur->status,
 621                                                slot_cur->ext_status);
 622        info->latch_status = SLOT_LATCH(slot_cur->status);
 623        if (!SLOT_PRESENT(slot_cur->status)) {
 624                info->adapter_status = 0;
 625/*              info->max_adapter_speed_status = MAX_ADAPTER_NONE; */
 626        } else {
 627                info->adapter_status = 1;
 628/*              get_max_adapter_speed_1(slot_cur->hotplug_slot,
 629                                        &info->max_adapter_speed_status, 0); */
 630        }
 631
 632        bus_speed = slot_cur->bus_on->current_speed;
 633        mode = slot_cur->bus_on->current_bus_mode;
 634
 635        switch (bus_speed) {
 636                case BUS_SPEED_33:
 637                        break;
 638                case BUS_SPEED_66:
 639                        if (mode == BUS_MODE_PCIX)
 640                                bus_speed += 0x01;
 641                        else if (mode == BUS_MODE_PCI)
 642                                ;
 643                        else
 644                                bus_speed = PCI_SPEED_UNKNOWN;
 645                        break;
 646                case BUS_SPEED_100:
 647                case BUS_SPEED_133:
 648                        bus_speed += 0x01;
 649                        break;
 650                default:
 651                        bus_speed = PCI_SPEED_UNKNOWN;
 652        }
 653
 654        bus->cur_bus_speed = bus_speed;
 655        // To do: bus_names
 656
 657        rc = pci_hp_change_slot_info(slot_cur->hotplug_slot, info);
 658        kfree(info);
 659        return rc;
 660}
 661
 662
 663/******************************************************************************
 664 * This function will return the pci_func, given bus and devfunc, or NULL.  It
 665 * is called from visit routines
 666 ******************************************************************************/
 667
 668static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
 669{
 670        struct pci_func *func_cur;
 671        struct slot *slot_cur;
 672        struct list_head *tmp;
 673        list_for_each(tmp, &ibmphp_slot_head) {
 674                slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
 675                if (slot_cur->func) {
 676                        func_cur = slot_cur->func;
 677                        while (func_cur) {
 678                                if ((func_cur->busno == busno) &&
 679                                                (func_cur->device == device) &&
 680                                                (func_cur->function == function))
 681                                        return func_cur;
 682                                func_cur = func_cur->next;
 683                        }
 684                }
 685        }
 686        return NULL;
 687}
 688
 689/*************************************************************
 690 * This routine frees up memory used by struct slot, including
 691 * the pointers to pci_func, bus, hotplug_slot, controller,
 692 * and deregistering from the hotplug core
 693 *************************************************************/
 694static void free_slots(void)
 695{
 696        struct slot *slot_cur;
 697        struct list_head *tmp;
 698        struct list_head *next;
 699
 700        debug("%s -- enter\n", __func__);
 701
 702        list_for_each_safe(tmp, next, &ibmphp_slot_head) {
 703                slot_cur = list_entry(tmp, struct slot, ibm_slot_list);
 704                pci_hp_deregister(slot_cur->hotplug_slot);
 705        }
 706        debug("%s -- exit\n", __func__);
 707}
 708
 709static void ibm_unconfigure_device(struct pci_func *func)
 710{
 711        struct pci_dev *temp;
 712        u8 j;
 713
 714        debug("inside %s\n", __func__);
 715        debug("func->device = %x, func->function = %x\n",
 716                                        func->device, func->function);
 717        debug("func->device << 3 | 0x0  = %x\n", func->device << 3 | 0x0);
 718
 719        pci_lock_rescan_remove();
 720
 721        for (j = 0; j < 0x08; j++) {
 722                temp = pci_get_bus_and_slot(func->busno, (func->device << 3) | j);
 723                if (temp) {
 724                        pci_stop_and_remove_bus_device(temp);
 725                        pci_dev_put(temp);
 726                }
 727        }
 728
 729        pci_dev_put(func->dev);
 730
 731        pci_unlock_rescan_remove();
 732}
 733
 734/*
 735 * The following function is to fix kernel bug regarding
 736 * getting bus entries, here we manually add those primary
 737 * bus entries to kernel bus structure whenever apply
 738 */
 739static u8 bus_structure_fixup(u8 busno)
 740{
 741        struct pci_bus *bus;
 742        struct pci_dev *dev;
 743        u16 l;
 744
 745        if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
 746                return 1;
 747
 748        bus = kmalloc(sizeof(*bus), GFP_KERNEL);
 749        if (!bus) {
 750                err("%s - out of memory\n", __func__);
 751                return 1;
 752        }
 753        dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 754        if (!dev) {
 755                kfree(bus);
 756                err("%s - out of memory\n", __func__);
 757                return 1;
 758        }
 759
 760        bus->number = busno;
 761        bus->ops = ibmphp_pci_bus->ops;
 762        dev->bus = bus;
 763        for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
 764                if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
 765                                        (l != 0x0000) && (l != 0xffff)) {
 766                        debug("%s - Inside bus_structure_fixup()\n",
 767                                                        __func__);
 768                        pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
 769                        break;
 770                }
 771        }
 772
 773        kfree(dev);
 774        kfree(bus);
 775
 776        return 0;
 777}
 778
 779static int ibm_configure_device(struct pci_func *func)
 780{
 781        struct pci_bus *child;
 782        int num;
 783        int flag = 0;   /* this is to make sure we don't double scan the bus,
 784                                        for bridged devices primarily */
 785
 786        pci_lock_rescan_remove();
 787
 788        if (!(bus_structure_fixup(func->busno)))
 789                flag = 1;
 790        if (func->dev == NULL)
 791                func->dev = pci_get_bus_and_slot(func->busno,
 792                                PCI_DEVFN(func->device, func->function));
 793
 794        if (func->dev == NULL) {
 795                struct pci_bus *bus = pci_find_bus(0, func->busno);
 796                if (!bus)
 797                        goto out;
 798
 799                num = pci_scan_slot(bus,
 800                                PCI_DEVFN(func->device, func->function));
 801                if (num)
 802                        pci_bus_add_devices(bus);
 803
 804                func->dev = pci_get_bus_and_slot(func->busno,
 805                                PCI_DEVFN(func->device, func->function));
 806                if (func->dev == NULL) {
 807                        err("ERROR... : pci_dev still NULL\n");
 808                        goto out;
 809                }
 810        }
 811        if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
 812                pci_hp_add_bridge(func->dev);
 813                child = func->dev->subordinate;
 814                if (child)
 815                        pci_bus_add_devices(child);
 816        }
 817
 818 out:
 819        pci_unlock_rescan_remove();
 820        return 0;
 821}
 822
 823/*******************************************************
 824 * Returns whether the bus is empty or not
 825 *******************************************************/
 826static int is_bus_empty(struct slot *slot_cur)
 827{
 828        int rc;
 829        struct slot *tmp_slot;
 830        u8 i = slot_cur->bus_on->slot_min;
 831
 832        while (i <= slot_cur->bus_on->slot_max) {
 833                if (i == slot_cur->number) {
 834                        i++;
 835                        continue;
 836                }
 837                tmp_slot = ibmphp_get_slot_from_physical_num(i);
 838                if (!tmp_slot)
 839                        return 0;
 840                rc = slot_update(&tmp_slot);
 841                if (rc)
 842                        return 0;
 843                if (SLOT_PRESENT(tmp_slot->status) &&
 844                                        SLOT_PWRGD(tmp_slot->status))
 845                        return 0;
 846                i++;
 847        }
 848        return 1;
 849}
 850
 851/***********************************************************
 852 * If the HPC permits and the bus currently empty, tries to set the
 853 * bus speed and mode at the maximum card and bus capability
 854 * Parameters: slot
 855 * Returns: bus is set (0) or error code
 856 ***********************************************************/
 857static int set_bus(struct slot *slot_cur)
 858{
 859        int rc;
 860        u8 speed;
 861        u8 cmd = 0x0;
 862        int retval;
 863        static struct pci_device_id ciobx[] = {
 864                { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
 865                { },
 866        };
 867
 868        debug("%s - entry slot # %d\n", __func__, slot_cur->number);
 869        if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
 870                rc = slot_update(&slot_cur);
 871                if (rc)
 872                        return rc;
 873                speed = SLOT_SPEED(slot_cur->ext_status);
 874                debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
 875                switch (speed) {
 876                case HPC_SLOT_SPEED_33:
 877                        cmd = HPC_BUS_33CONVMODE;
 878                        break;
 879                case HPC_SLOT_SPEED_66:
 880                        if (SLOT_PCIX(slot_cur->ext_status)) {
 881                                if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
 882                                                (slot_cur->supported_bus_mode == BUS_MODE_PCIX))
 883                                        cmd = HPC_BUS_66PCIXMODE;
 884                                else if (!SLOT_BUS_MODE(slot_cur->ext_status))
 885                                        /* if max slot/bus capability is 66 pci
 886                                        and there's no bus mode mismatch, then
 887                                        the adapter supports 66 pci */
 888                                        cmd = HPC_BUS_66CONVMODE;
 889                                else
 890                                        cmd = HPC_BUS_33CONVMODE;
 891                        } else {
 892                                if (slot_cur->supported_speed >= BUS_SPEED_66)
 893                                        cmd = HPC_BUS_66CONVMODE;
 894                                else
 895                                        cmd = HPC_BUS_33CONVMODE;
 896                        }
 897                        break;
 898                case HPC_SLOT_SPEED_133:
 899                        switch (slot_cur->supported_speed) {
 900                        case BUS_SPEED_33:
 901                                cmd = HPC_BUS_33CONVMODE;
 902                                break;
 903                        case BUS_SPEED_66:
 904                                if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
 905                                        cmd = HPC_BUS_66PCIXMODE;
 906                                else
 907                                        cmd = HPC_BUS_66CONVMODE;
 908                                break;
 909                        case BUS_SPEED_100:
 910                                cmd = HPC_BUS_100PCIXMODE;
 911                                break;
 912                        case BUS_SPEED_133:
 913                                /* This is to take care of the bug in CIOBX chip */
 914                                if (pci_dev_present(ciobx))
 915                                        ibmphp_hpc_writeslot(slot_cur,
 916                                                        HPC_BUS_100PCIXMODE);
 917                                cmd = HPC_BUS_133PCIXMODE;
 918                                break;
 919                        default:
 920                                err("Wrong bus speed\n");
 921                                return -ENODEV;
 922                        }
 923                        break;
 924                default:
 925                        err("wrong slot speed\n");
 926                        return -ENODEV;
 927                }
 928                debug("setting bus speed for slot %d, cmd %x\n",
 929                                                slot_cur->number, cmd);
 930                retval = ibmphp_hpc_writeslot(slot_cur, cmd);
 931                if (retval) {
 932                        err("setting bus speed failed\n");
 933                        return retval;
 934                }
 935                if (CTLR_RESULT(slot_cur->ctrl->status)) {
 936                        err("command not completed successfully in set_bus\n");
 937                        return -EIO;
 938                }
 939        }
 940        /* This is for x440, once Brandon fixes the firmware,
 941        will not need this delay */
 942        msleep(1000);
 943        debug("%s -Exit\n", __func__);
 944        return 0;
 945}
 946
 947/* This routine checks the bus limitations that the slot is on from the BIOS.
 948 * This is used in deciding whether or not to power up the slot.
 949 * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
 950 * same bus)
 951 * Parameters: slot
 952 * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
 953 */
 954static int check_limitations(struct slot *slot_cur)
 955{
 956        u8 i;
 957        struct slot *tmp_slot;
 958        u8 count = 0;
 959        u8 limitation = 0;
 960
 961        for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
 962                tmp_slot = ibmphp_get_slot_from_physical_num(i);
 963                if (!tmp_slot)
 964                        return -ENODEV;
 965                if ((SLOT_PWRGD(tmp_slot->status)) &&
 966                                        !(SLOT_CONNECT(tmp_slot->status)))
 967                        count++;
 968        }
 969        get_cur_bus_info(&slot_cur);
 970        switch (slot_cur->bus_on->current_speed) {
 971        case BUS_SPEED_33:
 972                limitation = slot_cur->bus_on->slots_at_33_conv;
 973                break;
 974        case BUS_SPEED_66:
 975                if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
 976                        limitation = slot_cur->bus_on->slots_at_66_pcix;
 977                else
 978                        limitation = slot_cur->bus_on->slots_at_66_conv;
 979                break;
 980        case BUS_SPEED_100:
 981                limitation = slot_cur->bus_on->slots_at_100_pcix;
 982                break;
 983        case BUS_SPEED_133:
 984                limitation = slot_cur->bus_on->slots_at_133_pcix;
 985                break;
 986        }
 987
 988        if ((count + 1) > limitation)
 989                return -EINVAL;
 990        return 0;
 991}
 992
 993static inline void print_card_capability(struct slot *slot_cur)
 994{
 995        info("capability of the card is ");
 996        if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
 997                info("   133 MHz PCI-X\n");
 998        else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
 999                info("    66 MHz PCI-X\n");
1000        else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
1001                info("    66 MHz PCI\n");
1002        else
1003                info("    33 MHz PCI\n");
1004
1005}
1006
1007/* This routine will power on the slot, configure the device(s) and find the
1008 * drivers for them.
1009 * Parameters: hotplug_slot
1010 * Returns: 0 or failure codes
1011 */
1012static int enable_slot(struct hotplug_slot *hs)
1013{
1014        int rc, i, rcpr;
1015        struct slot *slot_cur;
1016        u8 function;
1017        struct pci_func *tmp_func;
1018
1019        ibmphp_lock_operations();
1020
1021        debug("ENABLING SLOT........\n");
1022        slot_cur = hs->private;
1023
1024        rc = validate(slot_cur, ENABLE);
1025        if (rc) {
1026                err("validate function failed\n");
1027                goto error_nopower;
1028        }
1029
1030        attn_LED_blink(slot_cur);
1031
1032        rc = set_bus(slot_cur);
1033        if (rc) {
1034                err("was not able to set the bus\n");
1035                goto error_nopower;
1036        }
1037
1038        /*-----------------debugging------------------------------*/
1039        get_cur_bus_info(&slot_cur);
1040        debug("the current bus speed right after set_bus = %x\n",
1041                                        slot_cur->bus_on->current_speed);
1042        /*----------------------------------------------------------*/
1043
1044        rc = check_limitations(slot_cur);
1045        if (rc) {
1046                err("Adding this card exceeds the limitations of this bus.\n");
1047                err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
1048                err("Try hot-adding into another bus\n");
1049                rc = -EINVAL;
1050                goto error_nopower;
1051        }
1052
1053        rc = power_on(slot_cur);
1054
1055        if (rc) {
1056                err("something wrong when powering up... please see below for details\n");
1057                /* need to turn off before on, otherwise, blinking overwrites */
1058                attn_off(slot_cur);
1059                attn_on(slot_cur);
1060                if (slot_update(&slot_cur)) {
1061                        attn_off(slot_cur);
1062                        attn_on(slot_cur);
1063                        rc = -ENODEV;
1064                        goto exit;
1065                }
1066                /* Check to see the error of why it failed */
1067                if ((SLOT_POWER(slot_cur->status)) &&
1068                                        !(SLOT_PWRGD(slot_cur->status)))
1069                        err("power fault occurred trying to power up\n");
1070                else if (SLOT_BUS_SPEED(slot_cur->status)) {
1071                        err("bus speed mismatch occurred.  please check current bus speed and card capability\n");
1072                        print_card_capability(slot_cur);
1073                } else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
1074                        err("bus mode mismatch occurred.  please check current bus mode and card capability\n");
1075                        print_card_capability(slot_cur);
1076                }
1077                ibmphp_update_slot_info(slot_cur);
1078                goto exit;
1079        }
1080        debug("after power_on\n");
1081        /*-----------------------debugging---------------------------*/
1082        get_cur_bus_info(&slot_cur);
1083        debug("the current bus speed right after power_on = %x\n",
1084                                        slot_cur->bus_on->current_speed);
1085        /*----------------------------------------------------------*/
1086
1087        rc = slot_update(&slot_cur);
1088        if (rc)
1089                goto error_power;
1090
1091        rc = -EINVAL;
1092        if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
1093                err("power fault occurred trying to power up...\n");
1094                goto error_power;
1095        }
1096        if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
1097                err("bus speed mismatch occurred.  please check current bus speed and card capability\n");
1098                print_card_capability(slot_cur);
1099                goto error_power;
1100        }
1101        /* Don't think this case will happen after above checks...
1102         * but just in case, for paranoia sake */
1103        if (!(SLOT_POWER(slot_cur->status))) {
1104                err("power on failed...\n");
1105                goto error_power;
1106        }
1107
1108        slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
1109        if (!slot_cur->func) {
1110                /* We cannot do update_slot_info here, since no memory for
1111                 * kmalloc n.e.ways, and update_slot_info allocates some */
1112                err("out of system memory\n");
1113                rc = -ENOMEM;
1114                goto error_power;
1115        }
1116        slot_cur->func->busno = slot_cur->bus;
1117        slot_cur->func->device = slot_cur->device;
1118        for (i = 0; i < 4; i++)
1119                slot_cur->func->irq[i] = slot_cur->irq[i];
1120
1121        debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
1122                                        slot_cur->bus, slot_cur->device);
1123
1124        if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
1125                err("configure_card was unsuccessful...\n");
1126                /* true because don't need to actually deallocate resources,
1127                 * just remove references */
1128                ibmphp_unconfigure_card(&slot_cur, 1);
1129                debug("after unconfigure_card\n");
1130                slot_cur->func = NULL;
1131                rc = -ENOMEM;
1132                goto error_power;
1133        }
1134
1135        function = 0x00;
1136        do {
1137                tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
1138                                                        function++);
1139                if (tmp_func && !(tmp_func->dev))
1140                        ibm_configure_device(tmp_func);
1141        } while (tmp_func);
1142
1143        attn_off(slot_cur);
1144        if (slot_update(&slot_cur)) {
1145                rc = -EFAULT;
1146                goto exit;
1147        }
1148        ibmphp_print_test();
1149        rc = ibmphp_update_slot_info(slot_cur);
1150exit:
1151        ibmphp_unlock_operations();
1152        return rc;
1153
1154error_nopower:
1155        attn_off(slot_cur);     /* need to turn off if was blinking b4 */
1156        attn_on(slot_cur);
1157error_cont:
1158        rcpr = slot_update(&slot_cur);
1159        if (rcpr) {
1160                rc = rcpr;
1161                goto exit;
1162        }
1163        ibmphp_update_slot_info(slot_cur);
1164        goto exit;
1165
1166error_power:
1167        attn_off(slot_cur);     /* need to turn off if was blinking b4 */
1168        attn_on(slot_cur);
1169        rcpr = power_off(slot_cur);
1170        if (rcpr) {
1171                rc = rcpr;
1172                goto exit;
1173        }
1174        goto error_cont;
1175}
1176
1177/**************************************************************
1178* HOT REMOVING ADAPTER CARD                                   *
1179* INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE                *
1180* OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE         *
1181          DISABLE POWER ,                                    *
1182**************************************************************/
1183static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
1184{
1185        struct slot *slot = hotplug_slot->private;
1186        int rc;
1187
1188        ibmphp_lock_operations();
1189        rc = ibmphp_do_disable_slot(slot);
1190        ibmphp_unlock_operations();
1191        return rc;
1192}
1193
1194int ibmphp_do_disable_slot(struct slot *slot_cur)
1195{
1196        int rc;
1197        u8 flag;
1198
1199        debug("DISABLING SLOT...\n");
1200
1201        if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
1202                return -ENODEV;
1203
1204        flag = slot_cur->flag;
1205        slot_cur->flag = 1;
1206
1207        if (flag == 1) {
1208                rc = validate(slot_cur, DISABLE);
1209                        /* checking if powered off already & valid slot # */
1210                if (rc)
1211                        goto error;
1212        }
1213        attn_LED_blink(slot_cur);
1214
1215        if (slot_cur->func == NULL) {
1216                /* We need this for functions that were there on bootup */
1217                slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
1218                if (!slot_cur->func) {
1219                        err("out of system memory\n");
1220                        rc = -ENOMEM;
1221                        goto error;
1222                }
1223                slot_cur->func->busno = slot_cur->bus;
1224                slot_cur->func->device = slot_cur->device;
1225        }
1226
1227        ibm_unconfigure_device(slot_cur->func);
1228
1229        /*
1230         * If we got here from latch suddenly opening on operating card or
1231         * a power fault, there's no power to the card, so cannot
1232         * read from it to determine what resources it occupied.  This operation
1233         * is forbidden anyhow.  The best we can do is remove it from kernel
1234         * lists at least */
1235
1236        if (!flag) {
1237                attn_off(slot_cur);
1238                return 0;
1239        }
1240
1241        rc = ibmphp_unconfigure_card(&slot_cur, 0);
1242        slot_cur->func = NULL;
1243        debug("in disable_slot. after unconfigure_card\n");
1244        if (rc) {
1245                err("could not unconfigure card.\n");
1246                goto error;
1247        }
1248
1249        rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
1250        if (rc)
1251                goto error;
1252
1253        attn_off(slot_cur);
1254        rc = slot_update(&slot_cur);
1255        if (rc)
1256                goto exit;
1257
1258        rc = ibmphp_update_slot_info(slot_cur);
1259        ibmphp_print_test();
1260exit:
1261        return rc;
1262
1263error:
1264        /*  Need to turn off if was blinking b4 */
1265        attn_off(slot_cur);
1266        attn_on(slot_cur);
1267        if (slot_update(&slot_cur)) {
1268                rc = -EFAULT;
1269                goto exit;
1270        }
1271        if (flag)
1272                ibmphp_update_slot_info(slot_cur);
1273        goto exit;
1274}
1275
1276struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
1277        .set_attention_status =         set_attention_status,
1278        .enable_slot =                  enable_slot,
1279        .disable_slot =                 ibmphp_disable_slot,
1280        .hardware_test =                NULL,
1281        .get_power_status =             get_power_status,
1282        .get_attention_status =         get_attention_status,
1283        .get_latch_status =             get_latch_status,
1284        .get_adapter_status =           get_adapter_present,
1285/*      .get_max_adapter_speed =        get_max_adapter_speed,
1286        .get_bus_name_status =          get_bus_name,
1287*/
1288};
1289
1290static void ibmphp_unload(void)
1291{
1292        free_slots();
1293        debug("after slots\n");
1294        ibmphp_free_resources();
1295        debug("after resources\n");
1296        ibmphp_free_bus_info_queue();
1297        debug("after bus info\n");
1298        ibmphp_free_ebda_hpc_queue();
1299        debug("after ebda hpc\n");
1300        ibmphp_free_ebda_pci_rsrc_queue();
1301        debug("after ebda pci rsrc\n");
1302        kfree(ibmphp_pci_bus);
1303}
1304
1305static int __init ibmphp_init(void)
1306{
1307        struct pci_bus *bus;
1308        int i = 0;
1309        int rc = 0;
1310
1311        init_flag = 1;
1312
1313        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1314
1315        ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
1316        if (!ibmphp_pci_bus) {
1317                err("out of memory\n");
1318                rc = -ENOMEM;
1319                goto exit;
1320        }
1321
1322        bus = pci_find_bus(0, 0);
1323        if (!bus) {
1324                err("Can't find the root pci bus, can not continue\n");
1325                rc = -ENODEV;
1326                goto error;
1327        }
1328        memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
1329
1330        ibmphp_debug = debug;
1331
1332        ibmphp_hpc_initvars();
1333
1334        for (i = 0; i < 16; i++)
1335                irqs[i] = 0;
1336
1337        rc = ibmphp_access_ebda();
1338        if (rc)
1339                goto error;
1340        debug("after ibmphp_access_ebda()\n");
1341
1342        rc = ibmphp_rsrc_init();
1343        if (rc)
1344                goto error;
1345        debug("AFTER Resource & EBDA INITIALIZATIONS\n");
1346
1347        max_slots = get_max_slots();
1348
1349        rc = ibmphp_register_pci();
1350        if (rc)
1351                goto error;
1352
1353        if (init_ops()) {
1354                rc = -ENODEV;
1355                goto error;
1356        }
1357
1358        ibmphp_print_test();
1359        rc = ibmphp_hpc_start_poll_thread();
1360        if (rc)
1361                goto error;
1362
1363exit:
1364        return rc;
1365
1366error:
1367        ibmphp_unload();
1368        goto exit;
1369}
1370
1371static void __exit ibmphp_exit(void)
1372{
1373        ibmphp_hpc_stop_poll_thread();
1374        debug("after polling\n");
1375        ibmphp_unload();
1376        debug("done\n");
1377}
1378
1379module_init(ibmphp_init);
1380module_exit(ibmphp_exit);
1381
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