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