drivers/pci/hotplug/shpchp_ctrl.c

   1 /*
   2  * Standard Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/pci.h>
  34 #include <linux/workqueue.h>
  35 #include "../pci.h"
  36 #include "shpchp.h"
  37
  38 static void interrupt_event_handler(struct work_struct *work);
  39 static int shpchp_enable_slot(struct slot *p_slot);
  40 static int shpchp_disable_slot(struct slot *p_slot);
  41
  42 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  43 {
  44         struct event_info *info;
  45
  46         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  47         if (!info)
  48                 return -ENOMEM;
  49
  50         info->event_type = event_type;
  51         info->p_slot = p_slot;
  52         INIT_WORK(&info->work, interrupt_event_handler);
  53
  54         schedule_work(&info->work);
  55
  56         return 0;
  57 }
  58
  59 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
  60 {
  61         struct slot *p_slot;
  62         u32 event_type;
  63
  64         /* Attention Button Change */
  65         ctrl_dbg(ctrl, "Attention button interrupt received\n");
  66
  67         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  68         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
  69
  70         /*
  71          *  Button pressed - See if need to TAKE ACTION!!!
  72          */
  73         ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
  74         event_type = INT_BUTTON_PRESS;
  75
  76         queue_interrupt_event(p_slot, event_type);
  77
  78         return 0;
  79
  80 }
  81
  82 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
  83 {
  84         struct slot *p_slot;
  85         u8 getstatus;
  86         u32 event_type;
  87
  88         /* Switch Change */
  89         ctrl_dbg(ctrl, "Switch interrupt received\n");
  90
  91         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  92         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
  93         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  94         ctrl_dbg(ctrl, "Card present %x Power status %x\n",
  95                  p_slot->presence_save, p_slot->pwr_save);
  96
  97         if (getstatus) {
  98                 /*
  99                  * Switch opened
 100                  */
 101                 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
 102                 event_type = INT_SWITCH_OPEN;
 103                 if (p_slot->pwr_save && p_slot->presence_save) {
 104                         event_type = INT_POWER_FAULT;
 105                         ctrl_err(ctrl, "Surprise Removal of card\n");
 106                 }
 107         } else {
 108                 /*
 109                  *  Switch closed
 110                  */
 111                 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
 112                 event_type = INT_SWITCH_CLOSE;
 113         }
 114
 115         queue_interrupt_event(p_slot, event_type);
 116
 117         return 1;
 118 }
 119
 120 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
 121 {
 122         struct slot *p_slot;
 123         u32 event_type;
 124
 125         /* Presence Change */
 126         ctrl_dbg(ctrl, "Presence/Notify input change\n");
 127
 128         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 129
 130         /*
 131          * Save the presence state
 132          */
 133         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
 134         if (p_slot->presence_save) {
 135                 /*
 136                  * Card Present
 137                  */
 138                 ctrl_info(ctrl, "Card present on Slot(%s)\n",
 139                           slot_name(p_slot));
 140                 event_type = INT_PRESENCE_ON;
 141         } else {
 142                 /*
 143                  * Not Present
 144                  */
 145                 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
 146                           slot_name(p_slot));
 147                 event_type = INT_PRESENCE_OFF;
 148         }
 149
 150         queue_interrupt_event(p_slot, event_type);
 151
 152         return 1;
 153 }
 154
 155 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
 156 {
 157         struct slot *p_slot;
 158         u32 event_type;
 159
 160         /* Power fault */
 161         ctrl_dbg(ctrl, "Power fault interrupt received\n");
 162
 163         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 164
 165         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 166                 /*
 167                  * Power fault Cleared
 168                  */
 169                 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
 170                           slot_name(p_slot));
 171                 p_slot->status = 0x00;
 172                 event_type = INT_POWER_FAULT_CLEAR;
 173         } else {
 174                 /*
 175                  *   Power fault
 176                  */
 177                 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
 178                 event_type = INT_POWER_FAULT;
 179                 /* set power fault status for this board */
 180                 p_slot->status = 0xFF;
 181                 ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
 182         }
 183
 184         queue_interrupt_event(p_slot, event_type);
 185
 186         return 1;
 187 }
 188
 189 /* The following routines constitute the bulk of the
 190    hotplug controller logic
 191  */
 192 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
 193                 enum pci_bus_speed speed)
 194 {
 195         int rc = 0;
 196
 197         ctrl_dbg(ctrl, "Change speed to %d\n", speed);
 198         if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
 199                 ctrl_err(ctrl, "%s: Issue of set bus speed mode command "
 200                          "failed\n", __func__);
 201                 return WRONG_BUS_FREQUENCY;
 202         }
 203         return rc;
 204 }
 205
 206 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
 207                 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
 208                 enum pci_bus_speed msp)
 209 {
 210         int rc = 0;
 211
 212         /*
 213          * If other slots on the same bus are occupied, we cannot
 214          * change the bus speed.
 215          */
 216         if (flag) {
 217                 if (asp < bsp) {
 218                         ctrl_err(ctrl, "Speed of bus %x and adapter %x "
 219                                  "mismatch\n", bsp, asp);
 220                         rc = WRONG_BUS_FREQUENCY;
 221                 }
 222                 return rc;
 223         }
 224
 225         if (asp < msp) {
 226                 if (bsp != asp)
 227                         rc = change_bus_speed(ctrl, pslot, asp);
 228         } else {
 229                 if (bsp != msp)
 230                         rc = change_bus_speed(ctrl, pslot, msp);
 231         }
 232         return rc;
 233 }
 234
 235 /**
 236  * board_added - Called after a board has been added to the system.
 237  * @p_slot: target &slot
 238  *
 239  * Turns power on for the board.
 240  * Configures board.
 241  */
 242 static int board_added(struct slot *p_slot)
 243 {
 244         u8 hp_slot;
 245         u8 slots_not_empty = 0;
 246         int rc = 0;
 247         enum pci_bus_speed asp, bsp, msp;
 248         struct controller *ctrl = p_slot->ctrl;
 249         struct pci_bus *parent = ctrl->pci_dev->subordinate;
 250
 251         hp_slot = p_slot->device - ctrl->slot_device_offset;
 252
 253         ctrl_dbg(ctrl,
 254                  "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
 255                  __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
 256
 257         /* Power on slot without connecting to bus */
 258         rc = p_slot->hpc_ops->power_on_slot(p_slot);
 259         if (rc) {
 260                 ctrl_err(ctrl, "Failed to power on slot\n");
 261                 return -1;
 262         }
 263
 264         if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
 265                 if (slots_not_empty)
 266                         return WRONG_BUS_FREQUENCY;
 267
 268                 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
 269                         ctrl_err(ctrl, "%s: Issue of set bus speed mode command"
 270                                  " failed\n", __func__);
 271                         return WRONG_BUS_FREQUENCY;
 272                 }
 273
 274                 /* turn on board, blink green LED, turn off Amber LED */
 275                 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
 276                         ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
 277                         return rc;
 278                 }
 279         }
 280
 281         rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
 282         if (rc) {
 283                 ctrl_err(ctrl, "Can't get adapter speed or "
 284                          "bus mode mismatch\n");
 285                 return WRONG_BUS_FREQUENCY;
 286         }
 287
 288         rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bsp);
 289         if (rc) {
 290                 ctrl_err(ctrl, "Can't get bus operation speed\n");
 291                 return WRONG_BUS_FREQUENCY;
 292         }
 293
 294         rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &msp);
 295         if (rc) {
 296                 ctrl_err(ctrl, "Can't get max bus operation speed\n");
 297                 msp = bsp;
 298         }
 299
 300         /* Check if there are other slots or devices on the same bus */
 301         if (!list_empty(&ctrl->pci_dev->subordinate->devices))
 302                 slots_not_empty = 1;
 303
 304         ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d,"
 305                  " max_bus_speed %d\n", __func__, slots_not_empty, asp,
 306                  bsp, msp);
 307
 308         rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
 309         if (rc)
 310                 return rc;
 311
 312         /* turn on board, blink green LED, turn off Amber LED */
 313         if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
 314                 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
 315                 return rc;
 316         }
 317
 318         /* Wait for ~1 second */
 319         msleep(1000);
 320
 321         ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
 322         /* Check for a power fault */
 323         if (p_slot->status == 0xFF) {
 324                 /* power fault occurred, but it was benign */
 325                 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
 326                 rc = POWER_FAILURE;
 327                 p_slot->status = 0;
 328                 goto err_exit;
 329         }
 330
 331         if (shpchp_configure_device(p_slot)) {
 332                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
 333                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
 334                 goto err_exit;
 335         }
 336
 337         p_slot->status = 0;
 338         p_slot->is_a_board = 0x01;
 339         p_slot->pwr_save = 1;
 340
 341         p_slot->hpc_ops->green_led_on(p_slot);
 342
 343         return 0;
 344
 345 err_exit:
 346         /* turn off slot, turn on Amber LED, turn off Green LED */
 347         rc = p_slot->hpc_ops->slot_disable(p_slot);
 348         if (rc) {
 349                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 350                          __func__);
 351                 return rc;
 352         }
 353
 354         return(rc);
 355 }
 356
 357
 358 /**
 359  * remove_board - Turns off slot and LEDs
 360  * @p_slot: target &slot
 361  */
 362 static int remove_board(struct slot *p_slot)
 363 {
 364         struct controller *ctrl = p_slot->ctrl;
 365         u8 hp_slot;
 366         int rc;
 367
 368         if (shpchp_unconfigure_device(p_slot))
 369                 return(1);
 370
 371         hp_slot = p_slot->device - ctrl->slot_device_offset;
 372         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 373
 374         ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
 375
 376         /* Change status to shutdown */
 377         if (p_slot->is_a_board)
 378                 p_slot->status = 0x01;
 379
 380         /* turn off slot, turn on Amber LED, turn off Green LED */
 381         rc = p_slot->hpc_ops->slot_disable(p_slot);
 382         if (rc) {
 383                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 384                          __func__);
 385                 return rc;
 386         }
 387
 388         rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
 389         if (rc) {
 390                 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
 391                 return rc;
 392         }
 393
 394         p_slot->pwr_save = 0;
 395         p_slot->is_a_board = 0;
 396
 397         return 0;
 398 }
 399
 400
 401 struct pushbutton_work_info {
 402         struct slot *p_slot;
 403         struct work_struct work;
 404 };
 405
 406 /**
 407  * shpchp_pushbutton_thread - handle pushbutton events
 408  * @work: &struct work_struct to be handled
 409  *
 410  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 411  * Handles all pending events and exits.
 412  */
 413 static void shpchp_pushbutton_thread(struct work_struct *work)
 414 {
 415         struct pushbutton_work_info *info =
 416                 container_of(work, struct pushbutton_work_info, work);
 417         struct slot *p_slot = info->p_slot;
 418
 419         mutex_lock(&p_slot->lock);
 420         switch (p_slot->state) {
 421         case POWEROFF_STATE:
 422                 mutex_unlock(&p_slot->lock);
 423                 shpchp_disable_slot(p_slot);
 424                 mutex_lock(&p_slot->lock);
 425                 p_slot->state = STATIC_STATE;
 426                 break;
 427         case POWERON_STATE:
 428                 mutex_unlock(&p_slot->lock);
 429                 if (shpchp_enable_slot(p_slot))
 430                         p_slot->hpc_ops->green_led_off(p_slot);
 431                 mutex_lock(&p_slot->lock);
 432                 p_slot->state = STATIC_STATE;
 433                 break;
 434         default:
 435                 break;
 436         }
 437         mutex_unlock(&p_slot->lock);
 438
 439         kfree(info);
 440 }
 441
 442 void shpchp_queue_pushbutton_work(struct work_struct *work)
 443 {
 444         struct slot *p_slot = container_of(work, struct slot, work.work);
 445         struct pushbutton_work_info *info;
 446
 447         info = kmalloc(sizeof(*info), GFP_KERNEL);
 448         if (!info) {
 449                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 450                          __func__);
 451                 return;
 452         }
 453         info->p_slot = p_slot;
 454         INIT_WORK(&info->work, shpchp_pushbutton_thread);
 455
 456         mutex_lock(&p_slot->lock);
 457         switch (p_slot->state) {
 458         case BLINKINGOFF_STATE:
 459                 p_slot->state = POWEROFF_STATE;
 460                 break;
 461         case BLINKINGON_STATE:
 462                 p_slot->state = POWERON_STATE;
 463                 break;
 464         default:
 465                 goto out;
 466         }
 467         queue_work(shpchp_wq, &info->work);
 468  out:
 469         mutex_unlock(&p_slot->lock);
 470 }
 471
 472 static int update_slot_info (struct slot *slot)
 473 {
 474         struct hotplug_slot_info *info;
 475         int result;
 476
 477         info = kmalloc(sizeof(*info), GFP_KERNEL);
 478         if (!info)
 479                 return -ENOMEM;
 480
 481         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 482         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 483         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 484         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 485
 486         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 487         kfree (info);
 488         return result;
 489 }
 490
 491 /*
 492  * Note: This function must be called with slot->lock held
 493  */
 494 static void handle_button_press_event(struct slot *p_slot)
 495 {
 496         u8 getstatus;
 497         struct controller *ctrl = p_slot->ctrl;
 498
 499         switch (p_slot->state) {
 500         case STATIC_STATE:
 501                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 502                 if (getstatus) {
 503                         p_slot->state = BLINKINGOFF_STATE;
 504                         ctrl_info(ctrl, "PCI slot #%s - powering off due to "
 505                                   "button press.\n", slot_name(p_slot));
 506                 } else {
 507                         p_slot->state = BLINKINGON_STATE;
 508                         ctrl_info(ctrl, "PCI slot #%s - powering on due to "
 509                                   "button press.\n", slot_name(p_slot));
 510                 }
 511                 /* blink green LED and turn off amber */
 512                 p_slot->hpc_ops->green_led_blink(p_slot);
 513                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 514
 515                 schedule_delayed_work(&p_slot->work, 5*HZ);
 516                 break;
 517         case BLINKINGOFF_STATE:
 518         case BLINKINGON_STATE:
 519                 /*
 520                  * Cancel if we are still blinking; this means that we
 521                  * press the attention again before the 5 sec. limit
 522                  * expires to cancel hot-add or hot-remove
 523                  */
 524                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
 525                           slot_name(p_slot));
 526                 cancel_delayed_work(&p_slot->work);
 527                 if (p_slot->state == BLINKINGOFF_STATE)
 528                         p_slot->hpc_ops->green_led_on(p_slot);
 529                 else
 530                         p_slot->hpc_ops->green_led_off(p_slot);
 531                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 532                 ctrl_info(ctrl, "PCI slot #%s - action canceled due to "
 533                           "button press\n", slot_name(p_slot));
 534                 p_slot->state = STATIC_STATE;
 535                 break;
 536         case POWEROFF_STATE:
 537         case POWERON_STATE:
 538                 /*
 539                  * Ignore if the slot is on power-on or power-off state;
 540                  * this means that the previous attention button action
 541                  * to hot-add or hot-remove is undergoing
 542                  */
 543                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
 544                           slot_name(p_slot));
 545                 update_slot_info(p_slot);
 546                 break;
 547         default:
 548                 ctrl_warn(ctrl, "Not a valid state\n");
 549                 break;
 550         }
 551 }
 552
 553 static void interrupt_event_handler(struct work_struct *work)
 554 {
 555         struct event_info *info = container_of(work, struct event_info, work);
 556         struct slot *p_slot = info->p_slot;
 557
 558         mutex_lock(&p_slot->lock);
 559         switch (info->event_type) {
 560         case INT_BUTTON_PRESS:
 561                 handle_button_press_event(p_slot);
 562                 break;
 563         case INT_POWER_FAULT:
 564                 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
 565                 p_slot->hpc_ops->set_attention_status(p_slot, 1);
 566                 p_slot->hpc_ops->green_led_off(p_slot);
 567                 break;
 568         default:
 569                 update_slot_info(p_slot);
 570                 break;
 571         }
 572         mutex_unlock(&p_slot->lock);
 573
 574         kfree(info);
 575 }
 576
 577
 578 static int shpchp_enable_slot (struct slot *p_slot)
 579 {
 580         u8 getstatus = 0;
 581         int rc, retval = -ENODEV;
 582         struct controller *ctrl = p_slot->ctrl;
 583
 584         /* Check to see if (latch closed, card present, power off) */
 585         mutex_lock(&p_slot->ctrl->crit_sect);
 586         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 587         if (rc || !getstatus) {
 588                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 589                 goto out;
 590         }
 591         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 592         if (rc || getstatus) {
 593                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 594                 goto out;
 595         }
 596         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 597         if (rc || getstatus) {
 598                 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 599                           slot_name(p_slot));
 600                 goto out;
 601         }
 602
 603         p_slot->is_a_board = 1;
 604
 605         /* We have to save the presence info for these slots */
 606         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
 607         p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
 608         ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
 609         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 610
 611         if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
 612             (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
 613              && p_slot->ctrl->num_slots == 1) {
 614                 /* handle amd pogo errata; this must be done before enable  */
 615                 amd_pogo_errata_save_misc_reg(p_slot);
 616                 retval = board_added(p_slot);
 617                 /* handle amd pogo errata; this must be done after enable  */
 618                 amd_pogo_errata_restore_misc_reg(p_slot);
 619         } else
 620                 retval = board_added(p_slot);
 621
 622         if (retval) {
 623                 p_slot->hpc_ops->get_adapter_status(p_slot,
 624                                 &(p_slot->presence_save));
 625                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 626         }
 627
 628         update_slot_info(p_slot);
 629  out:
 630         mutex_unlock(&p_slot->ctrl->crit_sect);
 631         return retval;
 632 }
 633
 634
 635 static int shpchp_disable_slot (struct slot *p_slot)
 636 {
 637         u8 getstatus = 0;
 638         int rc, retval = -ENODEV;
 639         struct controller *ctrl = p_slot->ctrl;
 640
 641         if (!p_slot->ctrl)
 642                 return -ENODEV;
 643
 644         /* Check to see if (latch closed, card present, power on) */
 645         mutex_lock(&p_slot->ctrl->crit_sect);
 646
 647         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 648         if (rc || !getstatus) {
 649                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 650                 goto out;
 651         }
 652         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 653         if (rc || getstatus) {
 654                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 655                 goto out;
 656         }
 657         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 658         if (rc || !getstatus) {
 659                 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 660                           slot_name(p_slot));
 661                 goto out;
 662         }
 663
 664         retval = remove_board(p_slot);
 665         update_slot_info(p_slot);
 666  out:
 667         mutex_unlock(&p_slot->ctrl->crit_sect);
 668         return retval;
 669 }
 670
 671 int shpchp_sysfs_enable_slot(struct slot *p_slot)
 672 {
 673         int retval = -ENODEV;
 674         struct controller *ctrl = p_slot->ctrl;
 675
 676         mutex_lock(&p_slot->lock);
 677         switch (p_slot->state) {
 678         case BLINKINGON_STATE:
 679                 cancel_delayed_work(&p_slot->work);
 680         case STATIC_STATE:
 681                 p_slot->state = POWERON_STATE;
 682                 mutex_unlock(&p_slot->lock);
 683                 retval = shpchp_enable_slot(p_slot);
 684                 mutex_lock(&p_slot->lock);
 685                 p_slot->state = STATIC_STATE;
 686                 break;
 687         case POWERON_STATE:
 688                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 689                           slot_name(p_slot));
 690                 break;
 691         case BLINKINGOFF_STATE:
 692         case POWEROFF_STATE:
 693                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 694                           slot_name(p_slot));
 695                 break;
 696         default:
 697                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 698                          slot_name(p_slot));
 699                 break;
 700         }
 701         mutex_unlock(&p_slot->lock);
 702
 703         return retval;
 704 }
 705
 706 int shpchp_sysfs_disable_slot(struct slot *p_slot)
 707 {
 708         int retval = -ENODEV;
 709         struct controller *ctrl = p_slot->ctrl;
 710
 711         mutex_lock(&p_slot->lock);
 712         switch (p_slot->state) {
 713         case BLINKINGOFF_STATE:
 714                 cancel_delayed_work(&p_slot->work);
 715         case STATIC_STATE:
 716                 p_slot->state = POWEROFF_STATE;
 717                 mutex_unlock(&p_slot->lock);
 718                 retval = shpchp_disable_slot(p_slot);
 719                 mutex_lock(&p_slot->lock);
 720                 p_slot->state = STATIC_STATE;
 721                 break;
 722         case POWEROFF_STATE:
 723                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 724                           slot_name(p_slot));
 725                 break;
 726         case BLINKINGON_STATE:
 727         case POWERON_STATE:
 728                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 729                           slot_name(p_slot));
 730                 break;
 731         default:
 732                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 733                          slot_name(p_slot));
 734                 break;
 735         }
 736         mutex_unlock(&p_slot->lock);
 737
 738         return retval;
 739 }