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/slab.h>
  34 #include <linux/pci.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         queue_work(p_slot->wq, &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         rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed);
 199         if (rc) {
 200                 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
 201                          __func__);
 202                 return WRONG_BUS_FREQUENCY;
 203         }
 204         return rc;
 205 }
 206
 207 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
 208                 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
 209                 enum pci_bus_speed msp)
 210 {
 211         int rc = 0;
 212
 213         /*
 214          * If other slots on the same bus are occupied, we cannot
 215          * change the bus speed.
 216          */
 217         if (flag) {
 218                 if (asp < bsp) {
 219                         ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n",
 220                                  bsp, asp);
 221                         rc = WRONG_BUS_FREQUENCY;
 222                 }
 223                 return rc;
 224         }
 225
 226         if (asp < msp) {
 227                 if (bsp != asp)
 228                         rc = change_bus_speed(ctrl, pslot, asp);
 229         } else {
 230                 if (bsp != msp)
 231                         rc = change_bus_speed(ctrl, pslot, msp);
 232         }
 233         return rc;
 234 }
 235
 236 /**
 237  * board_added - Called after a board has been added to the system.
 238  * @p_slot: target &slot
 239  *
 240  * Turns power on for the board.
 241  * Configures board.
 242  */
 243 static int board_added(struct slot *p_slot)
 244 {
 245         u8 hp_slot;
 246         u8 slots_not_empty = 0;
 247         int rc = 0;
 248         enum pci_bus_speed asp, bsp, msp;
 249         struct controller *ctrl = p_slot->ctrl;
 250         struct pci_bus *parent = ctrl->pci_dev->subordinate;
 251
 252         hp_slot = p_slot->device - ctrl->slot_device_offset;
 253
 254         ctrl_dbg(ctrl, "%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                 rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz);
 266                 if (rc) {
 267                         ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
 268                                  __func__);
 269                         return WRONG_BUS_FREQUENCY;
 270                 }
 271
 272                 /* turn on board, blink green LED, turn off Amber LED */
 273                 rc = p_slot->hpc_ops->slot_enable(p_slot);
 274                 if (rc) {
 275                         ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
 276                         return rc;
 277                 }
 278         }
 279
 280         rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
 281         if (rc) {
 282                 ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n");
 283                 return WRONG_BUS_FREQUENCY;
 284         }
 285
 286         bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
 287         msp = ctrl->pci_dev->subordinate->max_bus_speed;
 288
 289         /* Check if there are other slots or devices on the same bus */
 290         if (!list_empty(&ctrl->pci_dev->subordinate->devices))
 291                 slots_not_empty = 1;
 292
 293         ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
 294                  __func__, slots_not_empty, asp,
 295                  bsp, msp);
 296
 297         rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
 298         if (rc)
 299                 return rc;
 300
 301         /* turn on board, blink green LED, turn off Amber LED */
 302         rc = p_slot->hpc_ops->slot_enable(p_slot);
 303         if (rc) {
 304                 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
 305                 return rc;
 306         }
 307
 308         /* Wait for ~1 second */
 309         msleep(1000);
 310
 311         ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
 312         /* Check for a power fault */
 313         if (p_slot->status == 0xFF) {
 314                 /* power fault occurred, but it was benign */
 315                 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
 316                 rc = POWER_FAILURE;
 317                 p_slot->status = 0;
 318                 goto err_exit;
 319         }
 320
 321         if (shpchp_configure_device(p_slot)) {
 322                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
 323                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
 324                 goto err_exit;
 325         }
 326
 327         p_slot->status = 0;
 328         p_slot->is_a_board = 0x01;
 329         p_slot->pwr_save = 1;
 330
 331         p_slot->hpc_ops->green_led_on(p_slot);
 332
 333         return 0;
 334
 335 err_exit:
 336         /* turn off slot, turn on Amber LED, turn off Green LED */
 337         rc = p_slot->hpc_ops->slot_disable(p_slot);
 338         if (rc) {
 339                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 340                          __func__);
 341                 return rc;
 342         }
 343
 344         return(rc);
 345 }
 346
 347
 348 /**
 349  * remove_board - Turns off slot and LEDs
 350  * @p_slot: target &slot
 351  */
 352 static int remove_board(struct slot *p_slot)
 353 {
 354         struct controller *ctrl = p_slot->ctrl;
 355         u8 hp_slot;
 356         int rc;
 357
 358         if (shpchp_unconfigure_device(p_slot))
 359                 return(1);
 360
 361         hp_slot = p_slot->device - ctrl->slot_device_offset;
 362         p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 363
 364         ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
 365
 366         /* Change status to shutdown */
 367         if (p_slot->is_a_board)
 368                 p_slot->status = 0x01;
 369
 370         /* turn off slot, turn on Amber LED, turn off Green LED */
 371         rc = p_slot->hpc_ops->slot_disable(p_slot);
 372         if (rc) {
 373                 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
 374                          __func__);
 375                 return rc;
 376         }
 377
 378         rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
 379         if (rc) {
 380                 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
 381                 return rc;
 382         }
 383
 384         p_slot->pwr_save = 0;
 385         p_slot->is_a_board = 0;
 386
 387         return 0;
 388 }
 389
 390
 391 struct pushbutton_work_info {
 392         struct slot *p_slot;
 393         struct work_struct work;
 394 };
 395
 396 /**
 397  * shpchp_pushbutton_thread - handle pushbutton events
 398  * @work: &struct work_struct to be handled
 399  *
 400  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 401  * Handles all pending events and exits.
 402  */
 403 static void shpchp_pushbutton_thread(struct work_struct *work)
 404 {
 405         struct pushbutton_work_info *info =
 406                 container_of(work, struct pushbutton_work_info, work);
 407         struct slot *p_slot = info->p_slot;
 408
 409         mutex_lock(&p_slot->lock);
 410         switch (p_slot->state) {
 411         case POWEROFF_STATE:
 412                 mutex_unlock(&p_slot->lock);
 413                 shpchp_disable_slot(p_slot);
 414                 mutex_lock(&p_slot->lock);
 415                 p_slot->state = STATIC_STATE;
 416                 break;
 417         case POWERON_STATE:
 418                 mutex_unlock(&p_slot->lock);
 419                 if (shpchp_enable_slot(p_slot))
 420                         p_slot->hpc_ops->green_led_off(p_slot);
 421                 mutex_lock(&p_slot->lock);
 422                 p_slot->state = STATIC_STATE;
 423                 break;
 424         default:
 425                 break;
 426         }
 427         mutex_unlock(&p_slot->lock);
 428
 429         kfree(info);
 430 }
 431
 432 void shpchp_queue_pushbutton_work(struct work_struct *work)
 433 {
 434         struct slot *p_slot = container_of(work, struct slot, work.work);
 435         struct pushbutton_work_info *info;
 436
 437         info = kmalloc(sizeof(*info), GFP_KERNEL);
 438         if (!info) {
 439                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 440                          __func__);
 441                 return;
 442         }
 443         info->p_slot = p_slot;
 444         INIT_WORK(&info->work, shpchp_pushbutton_thread);
 445
 446         mutex_lock(&p_slot->lock);
 447         switch (p_slot->state) {
 448         case BLINKINGOFF_STATE:
 449                 p_slot->state = POWEROFF_STATE;
 450                 break;
 451         case BLINKINGON_STATE:
 452                 p_slot->state = POWERON_STATE;
 453                 break;
 454         default:
 455                 kfree(info);
 456                 goto out;
 457         }
 458         queue_work(p_slot->wq, &info->work);
 459  out:
 460         mutex_unlock(&p_slot->lock);
 461 }
 462
 463 static int update_slot_info (struct slot *slot)
 464 {
 465         struct hotplug_slot_info *info;
 466         int result;
 467
 468         info = kmalloc(sizeof(*info), GFP_KERNEL);
 469         if (!info)
 470                 return -ENOMEM;
 471
 472         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 473         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 474         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 475         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 476
 477         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 478         kfree (info);
 479         return result;
 480 }
 481
 482 /*
 483  * Note: This function must be called with slot->lock held
 484  */
 485 static void handle_button_press_event(struct slot *p_slot)
 486 {
 487         u8 getstatus;
 488         struct controller *ctrl = p_slot->ctrl;
 489
 490         switch (p_slot->state) {
 491         case STATIC_STATE:
 492                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 493                 if (getstatus) {
 494                         p_slot->state = BLINKINGOFF_STATE;
 495                         ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
 496                                   slot_name(p_slot));
 497                 } else {
 498                         p_slot->state = BLINKINGON_STATE;
 499                         ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
 500                                   slot_name(p_slot));
 501                 }
 502                 /* blink green LED and turn off amber */
 503                 p_slot->hpc_ops->green_led_blink(p_slot);
 504                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 505
 506                 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
 507                 break;
 508         case BLINKINGOFF_STATE:
 509         case BLINKINGON_STATE:
 510                 /*
 511                  * Cancel if we are still blinking; this means that we
 512                  * press the attention again before the 5 sec. limit
 513                  * expires to cancel hot-add or hot-remove
 514                  */
 515                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
 516                           slot_name(p_slot));
 517                 cancel_delayed_work(&p_slot->work);
 518                 if (p_slot->state == BLINKINGOFF_STATE)
 519                         p_slot->hpc_ops->green_led_on(p_slot);
 520                 else
 521                         p_slot->hpc_ops->green_led_off(p_slot);
 522                 p_slot->hpc_ops->set_attention_status(p_slot, 0);
 523                 ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
 524                           slot_name(p_slot));
 525                 p_slot->state = STATIC_STATE;
 526                 break;
 527         case POWEROFF_STATE:
 528         case POWERON_STATE:
 529                 /*
 530                  * Ignore if the slot is on power-on or power-off state;
 531                  * this means that the previous attention button action
 532                  * to hot-add or hot-remove is undergoing
 533                  */
 534                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
 535                           slot_name(p_slot));
 536                 update_slot_info(p_slot);
 537                 break;
 538         default:
 539                 ctrl_warn(ctrl, "Not a valid state\n");
 540                 break;
 541         }
 542 }
 543
 544 static void interrupt_event_handler(struct work_struct *work)
 545 {
 546         struct event_info *info = container_of(work, struct event_info, work);
 547         struct slot *p_slot = info->p_slot;
 548
 549         mutex_lock(&p_slot->lock);
 550         switch (info->event_type) {
 551         case INT_BUTTON_PRESS:
 552                 handle_button_press_event(p_slot);
 553                 break;
 554         case INT_POWER_FAULT:
 555                 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
 556                 p_slot->hpc_ops->set_attention_status(p_slot, 1);
 557                 p_slot->hpc_ops->green_led_off(p_slot);
 558                 break;
 559         default:
 560                 update_slot_info(p_slot);
 561                 break;
 562         }
 563         mutex_unlock(&p_slot->lock);
 564
 565         kfree(info);
 566 }
 567
 568
 569 static int shpchp_enable_slot (struct slot *p_slot)
 570 {
 571         u8 getstatus = 0;
 572         int rc, retval = -ENODEV;
 573         struct controller *ctrl = p_slot->ctrl;
 574
 575         /* Check to see if (latch closed, card present, power off) */
 576         mutex_lock(&p_slot->ctrl->crit_sect);
 577         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 578         if (rc || !getstatus) {
 579                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 580                 goto out;
 581         }
 582         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 583         if (rc || getstatus) {
 584                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 585                 goto out;
 586         }
 587         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 588         if (rc || getstatus) {
 589                 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 590                           slot_name(p_slot));
 591                 goto out;
 592         }
 593
 594         p_slot->is_a_board = 1;
 595
 596         /* We have to save the presence info for these slots */
 597         p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
 598         p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
 599         ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
 600         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 601
 602         if (((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
 603             (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
 604              && p_slot->ctrl->num_slots == 1) {
 605                 /* handle amd pogo errata; this must be done before enable  */
 606                 amd_pogo_errata_save_misc_reg(p_slot);
 607                 retval = board_added(p_slot);
 608                 /* handle amd pogo errata; this must be done after enable  */
 609                 amd_pogo_errata_restore_misc_reg(p_slot);
 610         } else
 611                 retval = board_added(p_slot);
 612
 613         if (retval) {
 614                 p_slot->hpc_ops->get_adapter_status(p_slot,
 615                                 &(p_slot->presence_save));
 616                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 617         }
 618
 619         update_slot_info(p_slot);
 620  out:
 621         mutex_unlock(&p_slot->ctrl->crit_sect);
 622         return retval;
 623 }
 624
 625
 626 static int shpchp_disable_slot (struct slot *p_slot)
 627 {
 628         u8 getstatus = 0;
 629         int rc, retval = -ENODEV;
 630         struct controller *ctrl = p_slot->ctrl;
 631
 632         if (!p_slot->ctrl)
 633                 return -ENODEV;
 634
 635         /* Check to see if (latch closed, card present, power on) */
 636         mutex_lock(&p_slot->ctrl->crit_sect);
 637
 638         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 639         if (rc || !getstatus) {
 640                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 641                 goto out;
 642         }
 643         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 644         if (rc || getstatus) {
 645                 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
 646                 goto out;
 647         }
 648         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 649         if (rc || !getstatus) {
 650                 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 651                           slot_name(p_slot));
 652                 goto out;
 653         }
 654
 655         retval = remove_board(p_slot);
 656         update_slot_info(p_slot);
 657  out:
 658         mutex_unlock(&p_slot->ctrl->crit_sect);
 659         return retval;
 660 }
 661
 662 int shpchp_sysfs_enable_slot(struct slot *p_slot)
 663 {
 664         int retval = -ENODEV;
 665         struct controller *ctrl = p_slot->ctrl;
 666
 667         mutex_lock(&p_slot->lock);
 668         switch (p_slot->state) {
 669         case BLINKINGON_STATE:
 670                 cancel_delayed_work(&p_slot->work);
 671         case STATIC_STATE:
 672                 p_slot->state = POWERON_STATE;
 673                 mutex_unlock(&p_slot->lock);
 674                 retval = shpchp_enable_slot(p_slot);
 675                 mutex_lock(&p_slot->lock);
 676                 p_slot->state = STATIC_STATE;
 677                 break;
 678         case POWERON_STATE:
 679                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 680                           slot_name(p_slot));
 681                 break;
 682         case BLINKINGOFF_STATE:
 683         case POWEROFF_STATE:
 684                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 685                           slot_name(p_slot));
 686                 break;
 687         default:
 688                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 689                          slot_name(p_slot));
 690                 break;
 691         }
 692         mutex_unlock(&p_slot->lock);
 693
 694         return retval;
 695 }
 696
 697 int shpchp_sysfs_disable_slot(struct slot *p_slot)
 698 {
 699         int retval = -ENODEV;
 700         struct controller *ctrl = p_slot->ctrl;
 701
 702         mutex_lock(&p_slot->lock);
 703         switch (p_slot->state) {
 704         case BLINKINGOFF_STATE:
 705                 cancel_delayed_work(&p_slot->work);
 706         case STATIC_STATE:
 707                 p_slot->state = POWEROFF_STATE;
 708                 mutex_unlock(&p_slot->lock);
 709                 retval = shpchp_disable_slot(p_slot);
 710                 mutex_lock(&p_slot->lock);
 711                 p_slot->state = STATIC_STATE;
 712                 break;
 713         case POWEROFF_STATE:
 714                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 715                           slot_name(p_slot));
 716                 break;
 717         case BLINKINGON_STATE:
 718         case POWERON_STATE:
 719                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 720                           slot_name(p_slot));
 721                 break;
 722         default:
 723                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 724                          slot_name(p_slot));
 725                 break;
 726         }
 727         mutex_unlock(&p_slot->lock);
 728
 729         return retval;
 730 }