drivers/pci/hotplug/pciehp_ctrl.c

   1 /*
   2  * PCI Express 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/smp_lock.h>
  34 #include <linux/pci.h>
  35 #include "../pci.h"
  36 #include "pciehp.h"
  37
  38 static void interrupt_event_handler(struct controller *ctrl);
  39
  40 static struct semaphore event_semaphore;        /* mutex for process loop (up if something to process) */
  41 static struct semaphore event_exit;             /* guard ensure thread has exited before calling it quits */
  42 static int event_finished;
  43 static unsigned long pushbutton_pending;        /* = 0 */
  44 static unsigned long surprise_rm_pending;       /* = 0 */
  45
  46 static inline char *slot_name(struct slot *p_slot)
  47 {
  48         return p_slot->hotplug_slot->name;
  49 }
  50
  51 u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
  52 {
  53         struct slot *p_slot;
  54         u8 rc = 0;
  55         u8 getstatus;
  56         struct event_info *taskInfo;
  57
  58         /* Attention Button Change */
  59         dbg("pciehp:  Attention button interrupt received.\n");
  60
  61         /* This is the structure that tells the worker thread what to do */
  62         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
  63         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  64
  65         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  66
  67         ctrl->next_event = (ctrl->next_event + 1) % MAX_EVENTS;
  68         taskInfo->hp_slot = hp_slot;
  69
  70         rc++;
  71
  72         /*
  73          *  Button pressed - See if need to TAKE ACTION!!!
  74          */
  75         info("Button pressed on Slot(%s)\n", slot_name(p_slot));
  76         taskInfo->event_type = INT_BUTTON_PRESS;
  77
  78         if ((p_slot->state == BLINKINGON_STATE)
  79             || (p_slot->state == BLINKINGOFF_STATE)) {
  80                 /* Cancel if we are still blinking; this means that we press the
  81                  * attention again before the 5 sec. limit expires to cancel hot-add
  82                  * or hot-remove
  83                  */
  84                 taskInfo->event_type = INT_BUTTON_CANCEL;
  85                 info("Button cancel on Slot(%s)\n", slot_name(p_slot));
  86         } else if ((p_slot->state == POWERON_STATE)
  87                    || (p_slot->state == POWEROFF_STATE)) {
  88                 /* Ignore if the slot is on power-on or power-off state; this
  89                  * means that the previous attention button action to hot-add or
  90                  * hot-remove is undergoing
  91                  */
  92                 taskInfo->event_type = INT_BUTTON_IGNORE;
  93                 info("Button ignore on Slot(%s)\n", slot_name(p_slot));
  94         }
  95
  96         if (rc)
  97                 up(&event_semaphore);   /* signal event thread that new event is posted */
  98
  99         return 0;
 100
 101 }
 102
 103 u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
 104 {
 105         struct slot *p_slot;
 106         u8 rc = 0;
 107         u8 getstatus;
 108         struct event_info *taskInfo;
 109
 110         /* Switch Change */
 111         dbg("pciehp:  Switch interrupt received.\n");
 112
 113         /* This is the structure that tells the worker thread
 114          * what to do
 115          */
 116         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 117         ctrl->next_event = (ctrl->next_event + 1) % MAX_EVENTS;
 118         taskInfo->hp_slot = hp_slot;
 119
 120         rc++;
 121         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 122         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 123
 124         if (getstatus) {
 125                 /*
 126                  * Switch opened
 127                  */
 128                 info("Latch open on Slot(%s)\n", slot_name(p_slot));
 129                 taskInfo->event_type = INT_SWITCH_OPEN;
 130         } else {
 131                 /*
 132                  *  Switch closed
 133                  */
 134                 info("Latch close on Slot(%s)\n", slot_name(p_slot));
 135                 taskInfo->event_type = INT_SWITCH_CLOSE;
 136         }
 137
 138         if (rc)
 139                 up(&event_semaphore);   /* signal event thread that new event is posted */
 140
 141         return rc;
 142 }
 143
 144 u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
 145 {
 146         struct slot *p_slot;
 147         u8 presence_save, rc = 0;
 148         struct event_info *taskInfo;
 149
 150         /* Presence Change */
 151         dbg("pciehp:  Presence/Notify input change.\n");
 152
 153         /* This is the structure that tells the worker thread
 154          * what to do
 155          */
 156         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 157         ctrl->next_event = (ctrl->next_event + 1) % MAX_EVENTS;
 158         taskInfo->hp_slot = hp_slot;
 159
 160         rc++;
 161         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 162
 163         /* Switch is open, assume a presence change
 164          * Save the presence state
 165          */
 166         p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
 167         if (presence_save) {
 168                 /*
 169                  * Card Present
 170                  */
 171                 info("Card present on Slot(%s)\n", slot_name(p_slot));
 172                 taskInfo->event_type = INT_PRESENCE_ON;
 173         } else {
 174                 /*
 175                  * Not Present
 176                  */
 177                 info("Card not present on Slot(%s)\n", slot_name(p_slot));
 178                 taskInfo->event_type = INT_PRESENCE_OFF;
 179         }
 180
 181         if (rc)
 182                 up(&event_semaphore);   /* signal event thread that new event is posted */
 183
 184         return rc;
 185 }
 186
 187 u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
 188 {
 189         struct slot *p_slot;
 190         u8 rc = 0;
 191         struct event_info *taskInfo;
 192
 193         /* power fault */
 194         dbg("pciehp:  Power fault interrupt received.\n");
 195
 196         /* this is the structure that tells the worker thread
 197          * what to do
 198          */
 199         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 200         ctrl->next_event = (ctrl->next_event + 1) % MAX_EVENTS;
 201         taskInfo->hp_slot = hp_slot;
 202
 203         rc++;
 204         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 205
 206         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 207                 /*
 208                  * power fault Cleared
 209                  */
 210                 info("Power fault cleared on Slot(%s)\n", slot_name(p_slot));
 211                 taskInfo->event_type = INT_POWER_FAULT_CLEAR;
 212         } else {
 213                 /*
 214                  *   power fault
 215                  */
 216                 info("Power fault on Slot(%s)\n", slot_name(p_slot));
 217                 taskInfo->event_type = INT_POWER_FAULT;
 218                 info("power fault bit %x set\n", hp_slot);
 219         }
 220         if (rc)
 221                 up(&event_semaphore);   /* signal event thread that new event is posted */
 222
 223         return rc;
 224 }
 225
 226 /* The following routines constitute the bulk of the
 227    hotplug controller logic
 228  */
 229
 230 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 231 {
 232         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 233         if (POWER_CTRL(ctrl->ctrlcap)) {
 234                 if (pslot->hpc_ops->power_off_slot(pslot)) {
 235                         err("%s: Issue of Slot Power Off command failed\n",
 236                             __FUNCTION__);
 237                         return;
 238                 }
 239         }
 240
 241         if (PWR_LED(ctrl->ctrlcap))
 242                 pslot->hpc_ops->green_led_off(pslot);
 243
 244         if (ATTN_LED(ctrl->ctrlcap)) {
 245                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 246                         err("%s: Issue of Set Attention Led command failed\n",
 247                             __FUNCTION__);
 248                         return;
 249                 }
 250         }
 251 }
 252
 253 /**
 254  * board_added - Called after a board has been added to the system.
 255  *
 256  * Turns power on for the board
 257  * Configures board
 258  *
 259  */
 260 static int board_added(struct slot *p_slot)
 261 {
 262         u8 hp_slot;
 263         int retval = 0;
 264         struct controller *ctrl = p_slot->ctrl;
 265
 266         hp_slot = p_slot->device - ctrl->slot_device_offset;
 267
 268         dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
 269                         __FUNCTION__, p_slot->device,
 270                         ctrl->slot_device_offset, hp_slot);
 271
 272         if (POWER_CTRL(ctrl->ctrlcap)) {
 273                 /* Power on slot */
 274                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 275                 if (retval)
 276                         return retval;
 277         }
 278
 279         if (PWR_LED(ctrl->ctrlcap))
 280                 p_slot->hpc_ops->green_led_blink(p_slot);
 281
 282         /* Wait for ~1 second */
 283         msleep(1000);
 284
 285         /* Check link training status */
 286         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 287         if (retval) {
 288                 err("%s: Failed to check link status\n", __FUNCTION__);
 289                 set_slot_off(ctrl, p_slot);
 290                 return retval;
 291         }
 292
 293         /* Check for a power fault */
 294         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 295                 dbg("%s: power fault detected\n", __FUNCTION__);
 296                 retval = POWER_FAILURE;
 297                 goto err_exit;
 298         }
 299
 300         retval = pciehp_configure_device(p_slot);
 301         if (retval) {
 302                 err("Cannot add device 0x%x:%x\n", p_slot->bus,
 303                     p_slot->device);
 304                 goto err_exit;
 305         }
 306
 307         /*
 308          * Some PCI Express root ports require fixup after hot-plug operation.
 309          */
 310         if (pcie_mch_quirk)
 311                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 312         if (PWR_LED(ctrl->ctrlcap))
 313                 p_slot->hpc_ops->green_led_on(p_slot);
 314
 315         return 0;
 316
 317 err_exit:
 318         set_slot_off(ctrl, p_slot);
 319         return retval;
 320 }
 321
 322 /**
 323  * remove_board - Turns off slot and LED's
 324  *
 325  */
 326 static int remove_board(struct slot *p_slot)
 327 {
 328         u8 device;
 329         u8 hp_slot;
 330         int retval = 0;
 331         struct controller *ctrl = p_slot->ctrl;
 332
 333         retval = pciehp_unconfigure_device(p_slot);
 334         if (retval)
 335                 return retval;
 336
 337         device = p_slot->device;
 338         hp_slot = p_slot->device - ctrl->slot_device_offset;
 339         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 340
 341         dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
 342
 343         if (POWER_CTRL(ctrl->ctrlcap)) {
 344                 /* power off slot */
 345                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 346                 if (retval) {
 347                         err("%s: Issue of Slot Disable command failed\n",
 348                             __FUNCTION__);
 349                         return retval;
 350                 }
 351         }
 352
 353         if (PWR_LED(ctrl->ctrlcap))
 354                 /* turn off Green LED */
 355                 p_slot->hpc_ops->green_led_off(p_slot);
 356
 357         return 0;
 358 }
 359
 360
 361 static void pushbutton_helper_thread(unsigned long data)
 362 {
 363         pushbutton_pending = data;
 364
 365         up(&event_semaphore);
 366 }
 367
 368 /**
 369  * pciehp_pushbutton_thread
 370  *
 371  * Scheduled procedure to handle blocking stuff for the pushbuttons
 372  * Handles all pending events and exits.
 373  *
 374  */
 375 static void pciehp_pushbutton_thread(unsigned long slot)
 376 {
 377         struct slot *p_slot = (struct slot *) slot;
 378         u8 getstatus;
 379
 380         pushbutton_pending = 0;
 381
 382         if (!p_slot) {
 383                 dbg("%s: Error! slot NULL\n", __FUNCTION__);
 384                 return;
 385         }
 386
 387         p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 388         if (getstatus) {
 389                 p_slot->state = POWEROFF_STATE;
 390                 dbg("%s: disabling bus:device(%x:%x)\n", __FUNCTION__,
 391                                 p_slot->bus, p_slot->device);
 392
 393                 pciehp_disable_slot(p_slot);
 394                 p_slot->state = STATIC_STATE;
 395         } else {
 396                 p_slot->state = POWERON_STATE;
 397                 dbg("%s: adding bus:device(%x:%x)\n", __FUNCTION__,
 398                                 p_slot->bus, p_slot->device);
 399
 400                 if (pciehp_enable_slot(p_slot) &&
 401                     PWR_LED(p_slot->ctrl->ctrlcap))
 402                         p_slot->hpc_ops->green_led_off(p_slot);
 403
 404                 p_slot->state = STATIC_STATE;
 405         }
 406
 407         return;
 408 }
 409
 410 /**
 411  * pciehp_surprise_rm_thread
 412  *
 413  * Scheduled procedure to handle blocking stuff for the surprise removal
 414  * Handles all pending events and exits.
 415  *
 416  */
 417 static void pciehp_surprise_rm_thread(unsigned long slot)
 418 {
 419         struct slot *p_slot = (struct slot *) slot;
 420         u8 getstatus;
 421
 422         surprise_rm_pending = 0;
 423
 424         if (!p_slot) {
 425                 dbg("%s: Error! slot NULL\n", __FUNCTION__);
 426                 return;
 427         }
 428
 429         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 430         if (!getstatus) {
 431                 p_slot->state = POWEROFF_STATE;
 432                 dbg("%s: removing bus:device(%x:%x)\n",
 433                                 __FUNCTION__, p_slot->bus, p_slot->device);
 434
 435                 pciehp_disable_slot(p_slot);
 436                 p_slot->state = STATIC_STATE;
 437         } else {
 438                 p_slot->state = POWERON_STATE;
 439                 dbg("%s: adding bus:device(%x:%x)\n",
 440                                 __FUNCTION__, p_slot->bus, p_slot->device);
 441
 442                 if (pciehp_enable_slot(p_slot) &&
 443                     PWR_LED(p_slot->ctrl->ctrlcap))
 444                         p_slot->hpc_ops->green_led_off(p_slot);
 445
 446                 p_slot->state = STATIC_STATE;
 447         }
 448
 449         return;
 450 }
 451
 452
 453
 454 /* this is the main worker thread */
 455 static int event_thread(void* data)
 456 {
 457         struct controller *ctrl;
 458         lock_kernel();
 459         daemonize("pciehpd_event");
 460
 461         unlock_kernel();
 462
 463         while (1) {
 464                 dbg("!!!!event_thread sleeping\n");
 465                 down_interruptible (&event_semaphore);
 466                 dbg("event_thread woken finished = %d\n", event_finished);
 467                 if (event_finished || signal_pending(current))
 468                         break;
 469                 /* Do stuff here */
 470                 if (pushbutton_pending)
 471                         pciehp_pushbutton_thread(pushbutton_pending);
 472                 else if (surprise_rm_pending)
 473                         pciehp_surprise_rm_thread(surprise_rm_pending);
 474                 else
 475                         for (ctrl = pciehp_ctrl_list; ctrl; ctrl=ctrl->next)
 476                                 interrupt_event_handler(ctrl);
 477         }
 478         dbg("event_thread signals exit\n");
 479         up(&event_exit);
 480         return 0;
 481 }
 482
 483 int pciehp_event_start_thread(void)
 484 {
 485         int pid;
 486
 487         /* initialize our semaphores */
 488         init_MUTEX_LOCKED(&event_exit);
 489         event_finished=0;
 490
 491         init_MUTEX_LOCKED(&event_semaphore);
 492         pid = kernel_thread(event_thread, NULL, 0);
 493
 494         if (pid < 0) {
 495                 err ("Can't start up our event thread\n");
 496                 return -1;
 497         }
 498         return 0;
 499 }
 500
 501
 502 void pciehp_event_stop_thread(void)
 503 {
 504         event_finished = 1;
 505         up(&event_semaphore);
 506         down(&event_exit);
 507 }
 508
 509
 510 static int update_slot_info(struct slot *slot)
 511 {
 512         struct hotplug_slot_info *info;
 513         /* char buffer[SLOT_NAME_SIZE]; */
 514         int result;
 515
 516         info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
 517         if (!info)
 518                 return -ENOMEM;
 519
 520         /* make_slot_name (&buffer[0], SLOT_NAME_SIZE, slot); */
 521
 522         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 523         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 524         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 525         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 526
 527         /* result = pci_hp_change_slot_info(buffer, info); */
 528         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 529         kfree (info);
 530         return result;
 531 }
 532
 533 static void interrupt_event_handler(struct controller *ctrl)
 534 {
 535         int loop = 0;
 536         int change = 1;
 537         u8 hp_slot;
 538         u8 getstatus;
 539         struct slot *p_slot;
 540
 541         while (change) {
 542                 change = 0;
 543
 544                 for (loop = 0; loop < MAX_EVENTS; loop++) {
 545                         if (ctrl->event_queue[loop].event_type != 0) {
 546                                 hp_slot = ctrl->event_queue[loop].hp_slot;
 547
 548                                 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 549
 550                                 if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
 551                                         dbg("button cancel\n");
 552                                         del_timer(&p_slot->task_event);
 553
 554                                         switch (p_slot->state) {
 555                                         case BLINKINGOFF_STATE:
 556                                                 if (PWR_LED(ctrl->ctrlcap))
 557                                                         p_slot->hpc_ops->green_led_on(p_slot);
 558
 559                                                 if (ATTN_LED(ctrl->ctrlcap))
 560                                                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 561                                                 break;
 562                                         case BLINKINGON_STATE:
 563                                                 if (PWR_LED(ctrl->ctrlcap))
 564                                                         p_slot->hpc_ops->green_led_off(p_slot);
 565
 566                                                 if (ATTN_LED(ctrl->ctrlcap))
 567                                                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 568                                                 break;
 569                                         default:
 570                                                 warn("Not a valid state\n");
 571                                                 return;
 572                                         }
 573                                         info("PCI slot #%s - action canceled due to button press.\n", slot_name(p_slot));
 574                                         p_slot->state = STATIC_STATE;
 575                                 }
 576                                 /* ***********Button Pressed (No action on 1st press...) */
 577                                 else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
 578
 579                                         if (ATTN_BUTTN(ctrl->ctrlcap)) {
 580                                                 dbg("Button pressed\n");
 581                                                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 582                                                 if (getstatus) {
 583                                                         /* slot is on */
 584                                                         dbg("slot is on\n");
 585                                                         p_slot->state = BLINKINGOFF_STATE;
 586                                                         info("PCI slot #%s - powering off due to button press.\n", slot_name(p_slot));
 587                                                 } else {
 588                                                         /* slot is off */
 589                                                         dbg("slot is off\n");
 590                                                         p_slot->state = BLINKINGON_STATE;
 591                                                         info("PCI slot #%s - powering on due to button press.\n", slot_name(p_slot));
 592                                                 }
 593
 594                                                 /* blink green LED and turn off amber */
 595                                                 if (PWR_LED(ctrl->ctrlcap))
 596                                                         p_slot->hpc_ops->green_led_blink(p_slot);
 597
 598                                                 if (ATTN_LED(ctrl->ctrlcap))
 599                                                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 600
 601                                                 init_timer(&p_slot->task_event);
 602                                                 p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
 603                                                 p_slot->task_event.function = (void (*)(unsigned long)) pushbutton_helper_thread;
 604                                                 p_slot->task_event.data = (unsigned long) p_slot;
 605
 606                                                 add_timer(&p_slot->task_event);
 607                                         }
 608                                 }
 609                                 /***********POWER FAULT********************/
 610                                 else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
 611                                         if (POWER_CTRL(ctrl->ctrlcap)) {
 612                                                 dbg("power fault\n");
 613                                                 if (ATTN_LED(ctrl->ctrlcap))
 614                                                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 615
 616                                                 if (PWR_LED(ctrl->ctrlcap))
 617                                                         p_slot->hpc_ops->green_led_off(p_slot);
 618                                         }
 619                                 }
 620                                 /***********SURPRISE REMOVAL********************/
 621                                 else if ((ctrl->event_queue[loop].event_type == INT_PRESENCE_ON) ||
 622                                         (ctrl->event_queue[loop].event_type == INT_PRESENCE_OFF)) {
 623                                         if (HP_SUPR_RM(ctrl->ctrlcap)) {
 624                                                 dbg("Surprise Removal\n");
 625                                                 if (p_slot) {
 626                                                         surprise_rm_pending = (unsigned long) p_slot;
 627                                                         up(&event_semaphore);
 628                                                         update_slot_info(p_slot);
 629                                                 }
 630                                         }
 631                                 } else {
 632                                         /* refresh notification */
 633                                         if (p_slot)
 634                                                 update_slot_info(p_slot);
 635                                 }
 636
 637                                 ctrl->event_queue[loop].event_type = 0;
 638
 639                                 change = 1;
 640                         }
 641                 }               /* End of FOR loop */
 642         }
 643 }
 644
 645 int pciehp_enable_slot(struct slot *p_slot)
 646 {
 647         u8 getstatus = 0;
 648         int rc;
 649
 650         /* Check to see if (latch closed, card present, power off) */
 651         mutex_lock(&p_slot->ctrl->crit_sect);
 652
 653         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 654         if (rc || !getstatus) {
 655                 info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 656                      slot_name(p_slot));
 657                 mutex_unlock(&p_slot->ctrl->crit_sect);
 658                 return -ENODEV;
 659         }
 660         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 661                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 662                 if (rc || getstatus) {
 663                         info("%s: latch open on slot(%s)\n", __FUNCTION__,
 664                              slot_name(p_slot));
 665                         mutex_unlock(&p_slot->ctrl->crit_sect);
 666                         return -ENODEV;
 667                 }
 668         }
 669
 670         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 671                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 672                 if (rc || getstatus) {
 673                         info("%s: already enabled on slot(%s)\n", __FUNCTION__,
 674                              slot_name(p_slot));
 675                         mutex_unlock(&p_slot->ctrl->crit_sect);
 676                         return -EINVAL;
 677                 }
 678         }
 679
 680         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 681
 682         rc = board_added(p_slot);
 683         if (rc) {
 684                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 685         }
 686
 687         update_slot_info(p_slot);
 688
 689         mutex_unlock(&p_slot->ctrl->crit_sect);
 690         return rc;
 691 }
 692
 693
 694 int pciehp_disable_slot(struct slot *p_slot)
 695 {
 696         u8 getstatus = 0;
 697         int ret = 0;
 698
 699         if (!p_slot->ctrl)
 700                 return 1;
 701
 702         /* Check to see if (latch closed, card present, power on) */
 703         mutex_lock(&p_slot->ctrl->crit_sect);
 704
 705         if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
 706                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 707                 if (ret || !getstatus) {
 708                         info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 709                              slot_name(p_slot));
 710                         mutex_unlock(&p_slot->ctrl->crit_sect);
 711                         return -ENODEV;
 712                 }
 713         }
 714
 715         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 716                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 717                 if (ret || getstatus) {
 718                         info("%s: latch open on slot(%s)\n", __FUNCTION__,
 719                              slot_name(p_slot));
 720                         mutex_unlock(&p_slot->ctrl->crit_sect);
 721                         return -ENODEV;
 722                 }
 723         }
 724
 725         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 726                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 727                 if (ret || !getstatus) {
 728                         info("%s: already disabled slot(%s)\n", __FUNCTION__,
 729                              slot_name(p_slot));
 730                         mutex_unlock(&p_slot->ctrl->crit_sect);
 731                         return -EINVAL;
 732                 }
 733         }
 734
 735         ret = remove_board(p_slot);
 736         update_slot_info(p_slot);
 737
 738         mutex_unlock(&p_slot->ctrl->crit_sect);
 739         return ret;
 740 }
 741