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, "%s: Card present %x Power status %x\n",
  95                  __func__, 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, "%s: change to speed %d\n", __func__, 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, "%s: speed of bus %x and adapter %x "
 219                                  "mismatch\n", __func__, 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
 250         hp_slot = p_slot->device - ctrl->slot_device_offset;
 251
 252         ctrl_dbg(ctrl,
 253                  "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
 254                  __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
 255
 256         /* Power on slot without connecting to bus */
 257         rc = p_slot->hpc_ops->power_on_slot(p_slot);
 258         if (rc) {
 259                 ctrl_err(ctrl, "%s: Failed to power on slot\n", __func__);
 260                 return -1;
 261         }
 262
 263         if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
 264                 if (slots_not_empty)
 265                         return WRONG_BUS_FREQUENCY;
 266
 267                 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
 268                         ctrl_err(ctrl, "%s: Issue of set bus speed mode command"
 269                                  " failed\n", __func__);
 270                         return WRONG_BUS_FREQUENCY;
 271                 }
 272
 273                 /* turn on board, blink green LED, turn off Amber LED */
 274                 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
 275                         ctrl_err(ctrl, "%s: Issue of Slot Enable command"
 276                                  " failed\n", __func__);
 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, "%s: Can't get adapter speed or bus mode "
 284                          "mismatch\n", __func__);
 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, "%s: Can't get bus operation speed\n", __func__);
 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, "%s: Can't get max bus operation speed\n",
 297                          __func__);
 298                 msp = bsp;
 299         }
 300
 301         /* Check if there are other slots or devices on the same bus */
 302         if (!list_empty(&ctrl->pci_dev->subordinate->devices))
 303                 slots_not_empty = 1;
 304
 305         ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d,"
 306                  " max_bus_speed %d\n", __func__, slots_not_empty, asp,
 307                  bsp, msp);
 308
 309         rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
 310         if (rc)
 311                 return rc;
 312
 313         /* turn on board, blink green LED, turn off Amber LED */
 314         if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
 315                 ctrl_err(ctrl, "%s: Issue of Slot Enable command failed\n",
 316                          __func__);
 317                 return rc;
 318         }
 319
 320         /* Wait for ~1 second */
 321         msleep(1000);
 322
 323         ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
 324         /* Check for a power fault */
 325         if (p_slot->status == 0xFF) {
 326                 /* power fault occurred, but it was benign */
 327                 ctrl_dbg(ctrl, "%s: power fault\n", __func__);
 328                 rc = POWER_FAILURE;
 329                 p_slot->status = 0;
 330                 goto err_exit;
 331         }
 332
 333         if (shpchp_configure_device(p_slot)) {
 334                 ctrl_err(ctrl, "Cannot add device at 0x%x:0x%x\n",
 335                          p_slot->bus, p_slot->device);
 336                 goto err_exit;
 337         }
 338
 339         p_slot->status = 0;
 340         p_slot->is_a_board = 0x01;
 341         p_slot->pwr_save = 1;
 342
 343         p_slot->hpc_ops->green_led_on(p_slot);
 344
 345         return 0;
 346
 347 err_exit:
 348         /* turn off slot, turn on Amber LED, turn off Green LED */
 349         rc = p_slot->hpc_ops->slot_disable(p_slot);
 350         if (rc) {
 351                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 352                          __func__);
 353                 return rc;
 354         }
 355
 356         return(rc);
 357 }
 358
 359
 360 /**
 361  * remove_board - Turns off slot and LEDs
 362  * @p_slot: target &slot
 363  */
 364 static int remove_board(struct slot *p_slot)
 365 {
 366         struct controller *ctrl = p_slot->ctrl;
 367         u8 hp_slot;
 368         int rc;
 369
 370         if (shpchp_unconfigure_device(p_slot))
 371                 return(1);
 372
 373         hp_slot = p_slot->device - ctrl->slot_device_offset;
 374         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 375
 376         ctrl_dbg(ctrl, "In %s, hp_slot = %d\n", __func__, hp_slot);
 377
 378         /* Change status to shutdown */
 379         if (p_slot->is_a_board)
 380                 p_slot->status = 0x01;
 381
 382         /* turn off slot, turn on Amber LED, turn off Green LED */
 383         rc = p_slot->hpc_ops->slot_disable(p_slot);
 384         if (rc) {
 385                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 386                          __func__);
 387                 return rc;
 388         }
 389
 390         rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
 391         if (rc) {
 392                 ctrl_err(ctrl, "%s: Issue of Set Attention command failed\n",
 393                          __func__);
 394                 return rc;
 395         }
 396
 397         p_slot->pwr_save = 0;
 398         p_slot->is_a_board = 0;
 399
 400         return 0;
 401 }
 402
 403
 404 struct pushbutton_work_info {
 405         struct slot *p_slot;
 406         struct work_struct work;
 407 };
 408
 409 /**
 410  * shpchp_pushbutton_thread - handle pushbutton events
 411  * @work: &struct work_struct to be handled
 412  *
 413  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 414  * Handles all pending events and exits.
 415  */
 416 static void shpchp_pushbutton_thread(struct work_struct *work)
 417 {
 418         struct pushbutton_work_info *info =
 419                 container_of(work, struct pushbutton_work_info, work);
 420         struct slot *p_slot = info->p_slot;
 421
 422         mutex_lock(&p_slot->lock);
 423         switch (p_slot->state) {
 424         case POWEROFF_STATE:
 425                 mutex_unlock(&p_slot->lock);
 426                 shpchp_disable_slot(p_slot);
 427                 mutex_lock(&p_slot->lock);
 428                 p_slot->state = STATIC_STATE;
 429                 break;
 430         case POWERON_STATE:
 431                 mutex_unlock(&p_slot->lock);
 432                 if (shpchp_enable_slot(p_slot))
 433                         p_slot->hpc_ops->green_led_off(p_slot);
 434                 mutex_lock(&p_slot->lock);
 435                 p_slot->state = STATIC_STATE;
 436                 break;
 437         default:
 438                 break;
 439         }
 440         mutex_unlock(&p_slot->lock);
 441
 442         kfree(info);
 443 }
 444
 445 void shpchp_queue_pushbutton_work(struct work_struct *work)
 446 {
 447         struct slot *p_slot = container_of(work, struct slot, work.work);
 448         struct pushbutton_work_info *info;
 449
 450         info = kmalloc(sizeof(*info), GFP_KERNEL);
 451         if (!info) {
 452                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 453                          __func__);
 454                 return;
 455         }
 456         info->p_slot = p_slot;
 457         INIT_WORK(&info->work, shpchp_pushbutton_thread);
 458
 459         mutex_lock(&p_slot->lock);
 460         switch (p_slot->state) {
 461         case BLINKINGOFF_STATE:
 462                 p_slot->state = POWEROFF_STATE;
 463                 break;
 464         case BLINKINGON_STATE:
 465                 p_slot->state = POWERON_STATE;
 466                 break;
 467         default:
 468                 goto out;
 469         }
 470         queue_work(shpchp_wq, &info->work);
 471  out:
 472         mutex_unlock(&p_slot->lock);
 473 }
 474
 475 static int update_slot_info (struct slot *slot)
 476 {
 477         struct hotplug_slot_info *info;
 478         int result;
 479
 480         info = kmalloc(sizeof(*info), GFP_KERNEL);
 481         if (!info)
 482                 return -ENOMEM;
 483
 484         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 485         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 486         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 487         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 488
 489         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 490         kfree (info);
 491         return result;
 492 }
 493
 494 /*
 495  * Note: This function must be called with slot->lock held
 496  */
 497 static void handle_button_press_event(struct slot *p_slot)
 498 {
 499         u8 getstatus;
 500         struct controller *ctrl = p_slot->ctrl;
 501
 502         switch (p_slot->state) {
 503         case STATIC_STATE:
 504                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 505                 if (getstatus) {
 506                         p_slot->state = BLINKINGOFF_STATE;
 507                         ctrl_info(ctrl, "PCI slot #%s - powering off due to "
 508                                   "button press.\n", slot_name(p_slot));
 509                 } else {
 510                         p_slot->state = BLINKINGON_STATE;
 511                         ctrl_info(ctrl, "PCI slot #%s - powering on due to "
 512                                   "button press.\n", slot_name(p_slot));
 513                 }
 514                 /* blink green LED and turn off amber */
 515                 p_slot->hpc_ops->green_led_blink(p_slot);
 516                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 517
 518                 schedule_delayed_work(&p_slot->work, 5*HZ);
 519                 break;
 520         case BLINKINGOFF_STATE:
 521         case BLINKINGON_STATE:
 522                 /*
 523                  * Cancel if we are still blinking; this means that we
 524                  * press the attention again before the 5 sec. limit
 525                  * expires to cancel hot-add or hot-remove
 526                  */
 527                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
 528                           slot_name(p_slot));
 529                 ctrl_dbg(ctrl, "%s: button cancel\n", __func__);
 530                 cancel_delayed_work(&p_slot->work);
 531                 if (p_slot->state == BLINKINGOFF_STATE)
 532                         p_slot->hpc_ops->green_led_on(p_slot);
 533                 else
 534                         p_slot->hpc_ops->green_led_off(p_slot);
 535                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 536                 ctrl_info(ctrl, "PCI slot #%s - action canceled due to "
 537                           "button press\n", slot_name(p_slot));
 538                 p_slot->state = STATIC_STATE;
 539                 break;
 540         case POWEROFF_STATE:
 541         case POWERON_STATE:
 542                 /*
 543                  * Ignore if the slot is on power-on or power-off state;
 544                  * this means that the previous attention button action
 545                  * to hot-add or hot-remove is undergoing
 546                  */
 547                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
 548                           slot_name(p_slot));
 549                 update_slot_info(p_slot);
 550                 break;
 551         default:
 552                 ctrl_warn(ctrl, "Not a valid state\n");
 553                 break;
 554         }
 555 }
 556
 557 static void interrupt_event_handler(struct work_struct *work)
 558 {
 559         struct event_info *info = container_of(work, struct event_info, work);
 560         struct slot *p_slot = info->p_slot;
 561
 562         mutex_lock(&p_slot->lock);
 563         switch (info->event_type) {
 564         case INT_BUTTON_PRESS:
 565                 handle_button_press_event(p_slot);
 566                 break;
 567         case INT_POWER_FAULT:
 568                 ctrl_dbg(p_slot->ctrl, "%s: power fault\n", __func__);
 569                 p_slot->hpc_ops->set_attention_status(p_slot, 1);
 570                 p_slot->hpc_ops->green_led_off(p_slot);
 571                 break;
 572         default:
 573                 update_slot_info(p_slot);
 574                 break;
 575         }
 576         mutex_unlock(&p_slot->lock);
 577
 578         kfree(info);
 579 }
 580
 581
 582 static int shpchp_enable_slot (struct slot *p_slot)
 583 {
 584         u8 getstatus = 0;
 585         int rc, retval = -ENODEV;
 586         struct controller *ctrl = p_slot->ctrl;
 587
 588         /* Check to see if (latch closed, card present, power off) */
 589         mutex_lock(&p_slot->ctrl->crit_sect);
 590         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 591         if (rc || !getstatus) {
 592                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 593                 goto out;
 594         }
 595         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 596         if (rc || getstatus) {
 597                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 598                 goto out;
 599         }
 600         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 601         if (rc || getstatus) {
 602                 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 603                           slot_name(p_slot));
 604                 goto out;
 605         }
 606
 607         p_slot->is_a_board = 1;
 608
 609         /* We have to save the presence info for these slots */
 610         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
 611         p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
 612         ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
 613         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 614
 615         if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
 616             (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
 617              && p_slot->ctrl->num_slots == 1) {
 618                 /* handle amd pogo errata; this must be done before enable  */
 619                 amd_pogo_errata_save_misc_reg(p_slot);
 620                 retval = board_added(p_slot);
 621                 /* handle amd pogo errata; this must be done after enable  */
 622                 amd_pogo_errata_restore_misc_reg(p_slot);
 623         } else
 624                 retval = board_added(p_slot);
 625
 626         if (retval) {
 627                 p_slot->hpc_ops->get_adapter_status(p_slot,
 628                                 &(p_slot->presence_save));
 629                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 630         }
 631
 632         update_slot_info(p_slot);
 633  out:
 634         mutex_unlock(&p_slot->ctrl->crit_sect);
 635         return retval;
 636 }
 637
 638
 639 static int shpchp_disable_slot (struct slot *p_slot)
 640 {
 641         u8 getstatus = 0;
 642         int rc, retval = -ENODEV;
 643         struct controller *ctrl = p_slot->ctrl;
 644
 645         if (!p_slot->ctrl)
 646                 return -ENODEV;
 647
 648         /* Check to see if (latch closed, card present, power on) */
 649         mutex_lock(&p_slot->ctrl->crit_sect);
 650
 651         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 652         if (rc || !getstatus) {
 653                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 654                 goto out;
 655         }
 656         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 657         if (rc || getstatus) {
 658                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 659                 goto out;
 660         }
 661         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 662         if (rc || !getstatus) {
 663                 ctrl_info(ctrl, "Already disabled slot(%s)\n",
 664                           slot_name(p_slot));
 665                 goto out;
 666         }
 667
 668         retval = remove_board(p_slot);
 669         update_slot_info(p_slot);
 670  out:
 671         mutex_unlock(&p_slot->ctrl->crit_sect);
 672         return retval;
 673 }
 674
 675 int shpchp_sysfs_enable_slot(struct slot *p_slot)
 676 {
 677         int retval = -ENODEV;
 678         struct controller *ctrl = p_slot->ctrl;
 679
 680         mutex_lock(&p_slot->lock);
 681         switch (p_slot->state) {
 682         case BLINKINGON_STATE:
 683                 cancel_delayed_work(&p_slot->work);
 684         case STATIC_STATE:
 685                 p_slot->state = POWERON_STATE;
 686                 mutex_unlock(&p_slot->lock);
 687                 retval = shpchp_enable_slot(p_slot);
 688                 mutex_lock(&p_slot->lock);
 689                 p_slot->state = STATIC_STATE;
 690                 break;
 691         case POWERON_STATE:
 692                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 693                           slot_name(p_slot));
 694                 break;
 695         case BLINKINGOFF_STATE:
 696         case POWEROFF_STATE:
 697                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 698                           slot_name(p_slot));
 699                 break;
 700         default:
 701                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 702                          slot_name(p_slot));
 703                 break;
 704         }
 705         mutex_unlock(&p_slot->lock);
 706
 707         return retval;
 708 }
 709
 710 int shpchp_sysfs_disable_slot(struct slot *p_slot)
 711 {
 712         int retval = -ENODEV;
 713         struct controller *ctrl = p_slot->ctrl;
 714
 715         mutex_lock(&p_slot->lock);
 716         switch (p_slot->state) {
 717         case BLINKINGOFF_STATE:
 718                 cancel_delayed_work(&p_slot->work);
 719         case STATIC_STATE:
 720                 p_slot->state = POWEROFF_STATE;
 721                 mutex_unlock(&p_slot->lock);
 722                 retval = shpchp_disable_slot(p_slot);
 723                 mutex_lock(&p_slot->lock);
 724                 p_slot->state = STATIC_STATE;
 725                 break;
 726         case POWEROFF_STATE:
 727                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 728                           slot_name(p_slot));
 729                 break;
 730         case BLINKINGON_STATE:
 731         case POWERON_STATE:
 732                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 733                           slot_name(p_slot));
 734                 break;
 735         default:
 736                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 737                          slot_name(p_slot));
 738                 break;
 739         }
 740         mutex_unlock(&p_slot->lock);
 741
 742         return retval;
 743 }