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/config.h>
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/slab.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/delay.h>
  38 #include <linux/wait.h>
  39 #include <linux/smp_lock.h>
  40 #include <linux/pci.h>
  41 #include "../pci.h"
  42 #include "pciehp.h"
  43 #include "pciehprm.h"
  44
  45 static void interrupt_event_handler(struct controller *ctrl);
  46
  47 static struct semaphore event_semaphore;        /* mutex for process loop (up if something to process) */
  48 static struct semaphore event_exit;             /* guard ensure thread has exited before calling it quits */
  49 static int event_finished;
  50 static unsigned long pushbutton_pending;        /* = 0 */
  51 static unsigned long surprise_rm_pending;       /* = 0 */
  52
  53 u8 pciehp_handle_attention_button(u8 hp_slot, void *inst_id)
  54 {
  55         struct controller *ctrl = (struct controller *) inst_id;
  56         struct slot *p_slot;
  57         u8 rc = 0;
  58         u8 getstatus;
  59         struct pci_func *func;
  60         struct event_info *taskInfo;
  61
  62         /* Attention Button Change */
  63         dbg("pciehp:  Attention button interrupt received.\n");
  64
  65         func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
  66
  67         /* This is the structure that tells the worker thread what to do */
  68         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
  69         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  70
  71         p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
  72         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  73
  74         ctrl->next_event = (ctrl->next_event + 1) % 10;
  75         taskInfo->hp_slot = hp_slot;
  76
  77         rc++;
  78
  79         /*
  80          *  Button pressed - See if need to TAKE ACTION!!!
  81          */
  82         info("Button pressed on Slot(%d)\n", ctrl->first_slot + hp_slot);
  83         taskInfo->event_type = INT_BUTTON_PRESS;
  84
  85         if ((p_slot->state == BLINKINGON_STATE)
  86             || (p_slot->state == BLINKINGOFF_STATE)) {
  87                 /* Cancel if we are still blinking; this means that we press the
  88                  * attention again before the 5 sec. limit expires to cancel hot-add
  89                  * or hot-remove
  90                  */
  91                 taskInfo->event_type = INT_BUTTON_CANCEL;
  92                 info("Button cancel on Slot(%d)\n", ctrl->first_slot + hp_slot);
  93         } else if ((p_slot->state == POWERON_STATE)
  94                    || (p_slot->state == POWEROFF_STATE)) {
  95                 /* Ignore if the slot is on power-on or power-off state; this
  96                  * means that the previous attention button action to hot-add or
  97                  * hot-remove is undergoing
  98                  */
  99                 taskInfo->event_type = INT_BUTTON_IGNORE;
 100                 info("Button ignore on Slot(%d)\n", ctrl->first_slot + hp_slot);
 101         }
 102
 103         if (rc)
 104                 up(&event_semaphore);   /* signal event thread that new event is posted */
 105
 106         return 0;
 107
 108 }
 109
 110 u8 pciehp_handle_switch_change(u8 hp_slot, void *inst_id)
 111 {
 112         struct controller *ctrl = (struct controller *) inst_id;
 113         struct slot *p_slot;
 114         u8 rc = 0;
 115         u8 getstatus;
 116         struct pci_func *func;
 117         struct event_info *taskInfo;
 118
 119         /* Switch Change */
 120         dbg("pciehp:  Switch interrupt received.\n");
 121
 122         func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
 123
 124         /* This is the structure that tells the worker thread
 125          * what to do
 126          */
 127         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 128         ctrl->next_event = (ctrl->next_event + 1) % 10;
 129         taskInfo->hp_slot = hp_slot;
 130
 131         rc++;
 132         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 133         p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
 134         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 135
 136         if (getstatus) {
 137                 /*
 138                  * Switch opened
 139                  */
 140                 info("Latch open on Slot(%d)\n", ctrl->first_slot + hp_slot);
 141                 func->switch_save = 0;
 142                 taskInfo->event_type = INT_SWITCH_OPEN;
 143         } else {
 144                 /*
 145                  *  Switch closed
 146                  */
 147                 info("Latch close on Slot(%d)\n", ctrl->first_slot + hp_slot);
 148                 func->switch_save = 0x10;
 149                 taskInfo->event_type = INT_SWITCH_CLOSE;
 150         }
 151
 152         if (rc)
 153                 up(&event_semaphore);   /* signal event thread that new event is posted */
 154
 155         return rc;
 156 }
 157
 158 u8 pciehp_handle_presence_change(u8 hp_slot, void *inst_id)
 159 {
 160         struct controller *ctrl = (struct controller *) inst_id;
 161         struct slot *p_slot;
 162         u8 rc = 0;
 163         struct pci_func *func;
 164         struct event_info *taskInfo;
 165
 166         /* Presence Change */
 167         dbg("pciehp:  Presence/Notify input change.\n");
 168
 169         func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
 170
 171         /* This is the structure that tells the worker thread
 172          * what to do
 173          */
 174         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 175         ctrl->next_event = (ctrl->next_event + 1) % 10;
 176         taskInfo->hp_slot = hp_slot;
 177
 178         rc++;
 179         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 180
 181         /* Switch is open, assume a presence change
 182          * Save the presence state
 183          */
 184         p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
 185         if (func->presence_save) {
 186                 /*
 187                  * Card Present
 188                  */
 189                 info("Card present on Slot(%d)\n", ctrl->first_slot + hp_slot);
 190                 taskInfo->event_type = INT_PRESENCE_ON;
 191         } else {
 192                 /*
 193                  * Not Present
 194                  */
 195                 info("Card not present on Slot(%d)\n", ctrl->first_slot + hp_slot);
 196                 taskInfo->event_type = INT_PRESENCE_OFF;
 197         }
 198
 199         if (rc)
 200                 up(&event_semaphore);   /* signal event thread that new event is posted */
 201
 202         return rc;
 203 }
 204
 205 u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
 206 {
 207         struct controller *ctrl = (struct controller *) inst_id;
 208         struct slot *p_slot;
 209         u8 rc = 0;
 210         struct pci_func *func;
 211         struct event_info *taskInfo;
 212
 213         /* power fault */
 214         dbg("pciehp:  Power fault interrupt received.\n");
 215
 216         func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
 217
 218         /* this is the structure that tells the worker thread
 219          * what to do
 220          */
 221         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 222         ctrl->next_event = (ctrl->next_event + 1) % 10;
 223         taskInfo->hp_slot = hp_slot;
 224
 225         rc++;
 226         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 227
 228         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 229                 /*
 230                  * power fault Cleared
 231                  */
 232                 info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
 233                 func->status = 0x00;
 234                 taskInfo->event_type = INT_POWER_FAULT_CLEAR;
 235         } else {
 236                 /*
 237                  *   power fault
 238                  */
 239                 info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
 240                 taskInfo->event_type = INT_POWER_FAULT;
 241                 /* set power fault status for this board */
 242                 func->status = 0xFF;
 243                 info("power fault bit %x set\n", hp_slot);
 244         }
 245         if (rc)
 246                 up(&event_semaphore);   /* signal event thread that new event is posted */
 247
 248         return rc;
 249 }
 250
 251 /**
 252  * pciehp_slot_create - Creates a node and adds it to the proper bus.
 253  * @busnumber - bus where new node is to be located
 254  *
 255  * Returns pointer to the new node or NULL if unsuccessful
 256  */
 257 struct pci_func *pciehp_slot_create(u8 busnumber)
 258 {
 259         struct pci_func *new_slot;
 260         struct pci_func *next;
 261         dbg("%s: busnumber %x\n", __FUNCTION__, busnumber);
 262         new_slot = kmalloc(sizeof(struct pci_func), GFP_KERNEL);
 263
 264         if (new_slot == NULL)
 265                 return new_slot;
 266
 267         memset(new_slot, 0, sizeof(struct pci_func));
 268
 269         new_slot->next = NULL;
 270         new_slot->configured = 1;
 271
 272         if (pciehp_slot_list[busnumber] == NULL) {
 273                 pciehp_slot_list[busnumber] = new_slot;
 274         } else {
 275                 next = pciehp_slot_list[busnumber];
 276                 while (next->next != NULL)
 277                         next = next->next;
 278                 next->next = new_slot;
 279         }
 280         return new_slot;
 281 }
 282
 283
 284 /**
 285  * slot_remove - Removes a node from the linked list of slots.
 286  * @old_slot: slot to remove
 287  *
 288  * Returns 0 if successful, !0 otherwise.
 289  */
 290 static int slot_remove(struct pci_func * old_slot)
 291 {
 292         struct pci_func *next;
 293
 294         if (old_slot == NULL)
 295                 return 1;
 296
 297         next = pciehp_slot_list[old_slot->bus];
 298
 299         if (next == NULL)
 300                 return 1;
 301
 302         if (next == old_slot) {
 303                 pciehp_slot_list[old_slot->bus] = old_slot->next;
 304                 kfree(old_slot);
 305                 return 0;
 306         }
 307
 308         while ((next->next != old_slot) && (next->next != NULL)) {
 309                 next = next->next;
 310         }
 311
 312         if (next->next == old_slot) {
 313                 next->next = old_slot->next;
 314                 kfree(old_slot);
 315                 return 0;
 316         } else
 317                 return 2;
 318 }
 319
 320
 321 /**
 322  * bridge_slot_remove - Removes a node from the linked list of slots.
 323  * @bridge: bridge to remove
 324  *
 325  * Returns 0 if successful, !0 otherwise.
 326  */
 327 static int bridge_slot_remove(struct pci_func *bridge)
 328 {
 329         u8 subordinateBus, secondaryBus;
 330         u8 tempBus;
 331         struct pci_func *next;
 332
 333         if (bridge == NULL)
 334                 return 1;
 335
 336         secondaryBus = (bridge->config_space[0x06] >> 8) & 0xFF;
 337         subordinateBus = (bridge->config_space[0x06] >> 16) & 0xFF;
 338
 339         for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
 340                 next = pciehp_slot_list[tempBus];
 341
 342                 while (!slot_remove(next)) {
 343                         next = pciehp_slot_list[tempBus];
 344                 }
 345         }
 346
 347         next = pciehp_slot_list[bridge->bus];
 348
 349         if (next == NULL) {
 350                 return 1;
 351         }
 352
 353         if (next == bridge) {
 354                 pciehp_slot_list[bridge->bus] = bridge->next;
 355                 kfree(bridge);
 356                 return 0;
 357         }
 358
 359         while ((next->next != bridge) && (next->next != NULL)) {
 360                 next = next->next;
 361         }
 362
 363         if (next->next == bridge) {
 364                 next->next = bridge->next;
 365                 kfree(bridge);
 366                 return 0;
 367         } else
 368                 return 2;
 369 }
 370
 371
 372 /**
 373  * pciehp_slot_find - Looks for a node by bus, and device, multiple functions accessed
 374  * @bus: bus to find
 375  * @device: device to find
 376  * @index: is 0 for first function found, 1 for the second...
 377  *
 378  * Returns pointer to the node if successful, %NULL otherwise.
 379  */
 380 struct pci_func *pciehp_slot_find(u8 bus, u8 device, u8 index)
 381 {
 382         int found = -1;
 383         struct pci_func *func;
 384
 385         func = pciehp_slot_list[bus];
 386         dbg("%s: bus %x device %x index %x\n",
 387                 __FUNCTION__, bus, device, index);
 388         if (func != NULL) {
 389                 dbg("%s: func-> bus %x device %x function %x pci_dev %p\n",
 390                         __FUNCTION__, func->bus, func->device, func->function,
 391                         func->pci_dev);
 392         } else
 393                 dbg("%s: func == NULL\n", __FUNCTION__);
 394
 395         if ((func == NULL) || ((func->device == device) && (index == 0)))
 396                 return func;
 397
 398         if (func->device == device)
 399                 found++;
 400
 401         while (func->next != NULL) {
 402                 func = func->next;
 403
 404                 dbg("%s: In while loop, func-> bus %x device %x function %x pci_dev %p\n",
 405                         __FUNCTION__, func->bus, func->device, func->function,
 406                         func->pci_dev);
 407                 if (func->device == device)
 408                         found++;
 409                 dbg("%s: while loop, found %d, index %d\n", __FUNCTION__,
 410                         found, index);
 411
 412                 if ((found == index) || (func->function == index)) {
 413                         dbg("%s: Found bus %x dev %x func %x\n", __FUNCTION__,
 414                                         func->bus, func->device, func->function);
 415                         return func;
 416                 }
 417         }
 418
 419         return NULL;
 420 }
 421
 422 static int is_bridge(struct pci_func * func)
 423 {
 424         /* Check the header type */
 425         if (((func->config_space[0x03] >> 16) & 0xFF) == 0x01)
 426                 return 1;
 427         else
 428                 return 0;
 429 }
 430
 431
 432 /* The following routines constitute the bulk of the
 433    hotplug controller logic
 434  */
 435
 436 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 437 {
 438         /* Wait for exclusive access to hardware */
 439         down(&ctrl->crit_sect);
 440
 441         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 442         if (POWER_CTRL(ctrl->ctrlcap)) {
 443                 if (pslot->hpc_ops->power_off_slot(pslot)) {
 444                         err("%s: Issue of Slot Power Off command failed\n", __FUNCTION__);
 445                         up(&ctrl->crit_sect);
 446                         return;
 447                 }
 448                 wait_for_ctrl_irq (ctrl);
 449         }
 450
 451         if (PWR_LED(ctrl->ctrlcap)) {
 452                 pslot->hpc_ops->green_led_off(pslot);
 453                 wait_for_ctrl_irq (ctrl);
 454         }
 455
 456         if (ATTN_LED(ctrl->ctrlcap)) {
 457                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 458                         err("%s: Issue of Set Attention Led command failed\n", __FUNCTION__);
 459                         up(&ctrl->crit_sect);
 460                         return;
 461                 }
 462                 wait_for_ctrl_irq (ctrl);
 463         }
 464
 465         /* Done with exclusive hardware access */
 466         up(&ctrl->crit_sect);
 467 }
 468
 469 /**
 470  * board_added - Called after a board has been added to the system.
 471  *
 472  * Turns power on for the board
 473  * Configures board
 474  *
 475  */
 476 static u32 board_added(struct pci_func * func, struct controller * ctrl)
 477 {
 478         u8 hp_slot;
 479         u32 temp_register = 0xFFFFFFFF;
 480         u32 rc = 0;
 481         struct slot *p_slot;
 482
 483         p_slot = pciehp_find_slot(ctrl, func->device);
 484         hp_slot = func->device - ctrl->slot_device_offset;
 485
 486         dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n", __FUNCTION__, func->device, ctrl->slot_device_offset, hp_slot);
 487
 488         /* Wait for exclusive access to hardware */
 489         down(&ctrl->crit_sect);
 490
 491         if (POWER_CTRL(ctrl->ctrlcap)) {
 492                 /* Power on slot */
 493                 rc = p_slot->hpc_ops->power_on_slot(p_slot);
 494                 if (rc) {
 495                         up(&ctrl->crit_sect);
 496                         return -1;
 497                 }
 498
 499                 /* Wait for the command to complete */
 500                 wait_for_ctrl_irq (ctrl);
 501         }
 502
 503         if (PWR_LED(ctrl->ctrlcap)) {
 504                 p_slot->hpc_ops->green_led_blink(p_slot);
 505
 506                 /* Wait for the command to complete */
 507                 wait_for_ctrl_irq (ctrl);
 508         }
 509
 510         /* Done with exclusive hardware access */
 511         up(&ctrl->crit_sect);
 512
 513         /* Wait for ~1 second */
 514         dbg("%s: before long_delay\n", __FUNCTION__);
 515         wait_for_ctrl_irq (ctrl);
 516         dbg("%s: afterlong_delay\n", __FUNCTION__);
 517
 518         /*  Check link training status */
 519         rc = p_slot->hpc_ops->check_lnk_status(ctrl);
 520         if (rc) {
 521                 err("%s: Failed to check link status\n", __FUNCTION__);
 522                 set_slot_off(ctrl, p_slot);
 523                 return rc;
 524         }
 525
 526         dbg("%s: func status = %x\n", __FUNCTION__, func->status);
 527
 528         /* Check for a power fault */
 529         if (func->status == 0xFF) {
 530                 /* power fault occurred, but it was benign */
 531                 temp_register = 0xFFFFFFFF;
 532                 dbg("%s: temp register set to %x by power fault\n", __FUNCTION__, temp_register);
 533                 rc = POWER_FAILURE;
 534                 func->status = 0;
 535                 goto err_exit;
 536         }
 537
 538         rc = pciehp_configure_device(p_slot);
 539         if (rc) {
 540                 err("Cannot add device 0x%x:%x\n", p_slot->bus,
 541                                 p_slot->device);
 542                 goto err_exit;
 543         }
 544
 545         pciehp_save_slot_config(ctrl, func);
 546         func->status = 0;
 547         func->switch_save = 0x10;
 548         func->is_a_board = 0x01;
 549
 550         /*
 551          * Some PCI Express root ports require fixup after hot-plug operation.
 552          */
 553         if (pcie_mch_quirk)
 554                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 555         if (PWR_LED(ctrl->ctrlcap)) {
 556                 /* Wait for exclusive access to hardware */
 557                 down(&ctrl->crit_sect);
 558
 559                 p_slot->hpc_ops->green_led_on(p_slot);
 560
 561                 /* Wait for the command to complete */
 562                 wait_for_ctrl_irq (ctrl);
 563
 564                 /* Done with exclusive hardware access */
 565                 up(&ctrl->crit_sect);
 566         }
 567         return 0;
 568
 569 err_exit:
 570         set_slot_off(ctrl, p_slot);
 571         return -1;
 572 }
 573
 574
 575 /**
 576  * remove_board - Turns off slot and LED's
 577  *
 578  */
 579 static u32 remove_board(struct pci_func *func, struct controller *ctrl)
 580 {
 581         u8 device;
 582         u8 hp_slot;
 583         u32 rc;
 584         struct slot *p_slot;
 585
 586         if (func == NULL)
 587                 return 1;
 588
 589         if (pciehp_unconfigure_device(func))
 590                 return 1;
 591
 592         device = func->device;
 593
 594         hp_slot = func->device - ctrl->slot_device_offset;
 595         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 596
 597         dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
 598
 599         /* Change status to shutdown */
 600         if (func->is_a_board)
 601                 func->status = 0x01;
 602         func->configured = 0;
 603
 604         /* Wait for exclusive access to hardware */
 605         down(&ctrl->crit_sect);
 606
 607         if (POWER_CTRL(ctrl->ctrlcap)) {
 608                 /* power off slot */
 609                 rc = p_slot->hpc_ops->power_off_slot(p_slot);
 610                 if (rc) {
 611                         err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
 612                         up(&ctrl->crit_sect);
 613                         return rc;
 614                 }
 615                 /* Wait for the command to complete */
 616                 wait_for_ctrl_irq (ctrl);
 617         }
 618
 619         if (PWR_LED(ctrl->ctrlcap)) {
 620                 /* turn off Green LED */
 621                 p_slot->hpc_ops->green_led_off(p_slot);
 622
 623                 /* Wait for the command to complete */
 624                 wait_for_ctrl_irq (ctrl);
 625         }
 626
 627         /* Done with exclusive hardware access */
 628         up(&ctrl->crit_sect);
 629
 630         if (ctrl->add_support) {
 631                 while (func) {
 632                         if (is_bridge(func)) {
 633                                 dbg("PCI Bridge Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n",
 634                                         ctrl->seg, func->bus, func->device, func->function);
 635                                 bridge_slot_remove(func);
 636                         } else {
 637                                 dbg("PCI Function Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n",
 638                                         ctrl->seg, func->bus, func->device, func->function);
 639                                 slot_remove(func);
 640                         }
 641
 642                         func = pciehp_slot_find(ctrl->slot_bus, device, 0);
 643                 }
 644
 645                 /* Setup slot structure with entry for empty slot */
 646                 func = pciehp_slot_create(ctrl->slot_bus);
 647
 648                 if (func == NULL) {
 649                         return 1;
 650                 }
 651
 652                 func->bus = ctrl->slot_bus;
 653                 func->device = device;
 654                 func->function = 0;
 655                 func->configured = 0;
 656                 func->switch_save = 0x10;
 657                 func->is_a_board = 0;
 658         }
 659
 660         return 0;
 661 }
 662
 663
 664 static void pushbutton_helper_thread(unsigned long data)
 665 {
 666         pushbutton_pending = data;
 667
 668         up(&event_semaphore);
 669 }
 670
 671 /**
 672  * pciehp_pushbutton_thread
 673  *
 674  * Scheduled procedure to handle blocking stuff for the pushbuttons
 675  * Handles all pending events and exits.
 676  *
 677  */
 678 static void pciehp_pushbutton_thread(unsigned long slot)
 679 {
 680         struct slot *p_slot = (struct slot *) slot;
 681         u8 getstatus;
 682
 683         pushbutton_pending = 0;
 684
 685         if (!p_slot) {
 686                 dbg("%s: Error! slot NULL\n", __FUNCTION__);
 687                 return;
 688         }
 689
 690         p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 691         if (getstatus) {
 692                 p_slot->state = POWEROFF_STATE;
 693                 dbg("In power_down_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
 694
 695                 pciehp_disable_slot(p_slot);
 696                 p_slot->state = STATIC_STATE;
 697         } else {
 698                 p_slot->state = POWERON_STATE;
 699                 dbg("In add_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
 700
 701                 if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
 702                         /* Wait for exclusive access to hardware */
 703                         down(&p_slot->ctrl->crit_sect);
 704
 705                         p_slot->hpc_ops->green_led_off(p_slot);
 706
 707                         /* Wait for the command to complete */
 708                         wait_for_ctrl_irq (p_slot->ctrl);
 709
 710                         /* Done with exclusive hardware access */
 711                         up(&p_slot->ctrl->crit_sect);
 712                 }
 713                 p_slot->state = STATIC_STATE;
 714         }
 715
 716         return;
 717 }
 718
 719 /**
 720  * pciehp_surprise_rm_thread
 721  *
 722  * Scheduled procedure to handle blocking stuff for the surprise removal
 723  * Handles all pending events and exits.
 724  *
 725  */
 726 static void pciehp_surprise_rm_thread(unsigned long slot)
 727 {
 728         struct slot *p_slot = (struct slot *) slot;
 729         u8 getstatus;
 730
 731         surprise_rm_pending = 0;
 732
 733         if (!p_slot) {
 734                 dbg("%s: Error! slot NULL\n", __FUNCTION__);
 735                 return;
 736         }
 737
 738         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 739         if (!getstatus) {
 740                 p_slot->state = POWEROFF_STATE;
 741                 dbg("In removing board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
 742
 743                 pciehp_disable_slot(p_slot);
 744                 p_slot->state = STATIC_STATE;
 745         } else {
 746                 p_slot->state = POWERON_STATE;
 747                 dbg("In add_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
 748
 749                 if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
 750                         /* Wait for exclusive access to hardware */
 751                         down(&p_slot->ctrl->crit_sect);
 752
 753                         p_slot->hpc_ops->green_led_off(p_slot);
 754
 755                         /* Wait for the command to complete */
 756                         wait_for_ctrl_irq (p_slot->ctrl);
 757
 758                         /* Done with exclusive hardware access */
 759                         up(&p_slot->ctrl->crit_sect);
 760                 }
 761                 p_slot->state = STATIC_STATE;
 762         }
 763
 764         return;
 765 }
 766
 767
 768
 769 /* this is the main worker thread */
 770 static int event_thread(void* data)
 771 {
 772         struct controller *ctrl;
 773         lock_kernel();
 774         daemonize("pciehpd_event");
 775
 776         unlock_kernel();
 777
 778         while (1) {
 779                 dbg("!!!!event_thread sleeping\n");
 780                 down_interruptible (&event_semaphore);
 781                 dbg("event_thread woken finished = %d\n", event_finished);
 782                 if (event_finished || signal_pending(current))
 783                         break;
 784                 /* Do stuff here */
 785                 if (pushbutton_pending)
 786                         pciehp_pushbutton_thread(pushbutton_pending);
 787                 else if (surprise_rm_pending)
 788                         pciehp_surprise_rm_thread(surprise_rm_pending);
 789                 else
 790                         for (ctrl = pciehp_ctrl_list; ctrl; ctrl=ctrl->next)
 791                                 interrupt_event_handler(ctrl);
 792         }
 793         dbg("event_thread signals exit\n");
 794         up(&event_exit);
 795         return 0;
 796 }
 797
 798 int pciehp_event_start_thread(void)
 799 {
 800         int pid;
 801
 802         /* initialize our semaphores */
 803         init_MUTEX_LOCKED(&event_exit);
 804         event_finished=0;
 805
 806         init_MUTEX_LOCKED(&event_semaphore);
 807         pid = kernel_thread(event_thread, NULL, 0);
 808
 809         if (pid < 0) {
 810                 err ("Can't start up our event thread\n");
 811                 return -1;
 812         }
 813         dbg("Our event thread pid = %d\n", pid);
 814         return 0;
 815 }
 816
 817
 818 void pciehp_event_stop_thread(void)
 819 {
 820         event_finished = 1;
 821         dbg("event_thread finish command given\n");
 822         up(&event_semaphore);
 823         dbg("wait for event_thread to exit\n");
 824         down(&event_exit);
 825 }
 826
 827
 828 static int update_slot_info(struct slot *slot)
 829 {
 830         struct hotplug_slot_info *info;
 831         /* char buffer[SLOT_NAME_SIZE]; */
 832         int result;
 833
 834         info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
 835         if (!info)
 836                 return -ENOMEM;
 837
 838         /* make_slot_name (&buffer[0], SLOT_NAME_SIZE, slot); */
 839
 840         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 841         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 842         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 843         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 844
 845         /* result = pci_hp_change_slot_info(buffer, info); */
 846         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 847         kfree (info);
 848         return result;
 849 }
 850
 851 static void interrupt_event_handler(struct controller *ctrl)
 852 {
 853         int loop = 0;
 854         int change = 1;
 855         struct pci_func *func;
 856         u8 hp_slot;
 857         u8 getstatus;
 858         struct slot *p_slot;
 859
 860         while (change) {
 861                 change = 0;
 862
 863                 for (loop = 0; loop < 10; loop++) {
 864                         if (ctrl->event_queue[loop].event_type != 0) {
 865                                 hp_slot = ctrl->event_queue[loop].hp_slot;
 866
 867                                 func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
 868
 869                                 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 870
 871                                 dbg("hp_slot %d, func %p, p_slot %p\n", hp_slot, func, p_slot);
 872
 873                                 if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
 874                                         dbg("button cancel\n");
 875                                         del_timer(&p_slot->task_event);
 876
 877                                         switch (p_slot->state) {
 878                                         case BLINKINGOFF_STATE:
 879                                                 /* Wait for exclusive access to hardware */
 880                                                 down(&ctrl->crit_sect);
 881
 882                                                 if (PWR_LED(ctrl->ctrlcap)) {
 883                                                         p_slot->hpc_ops->green_led_on(p_slot);
 884                                                         /* Wait for the command to complete */
 885                                                         wait_for_ctrl_irq (ctrl);
 886                                                 }
 887                                                 if (ATTN_LED(ctrl->ctrlcap)) {
 888                                                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 889
 890                                                         /* Wait for the command to complete */
 891                                                         wait_for_ctrl_irq (ctrl);
 892                                                 }
 893                                                 /* Done with exclusive hardware access */
 894                                                 up(&ctrl->crit_sect);
 895                                                 break;
 896                                         case BLINKINGON_STATE:
 897                                                 /* Wait for exclusive access to hardware */
 898                                                 down(&ctrl->crit_sect);
 899
 900                                                 if (PWR_LED(ctrl->ctrlcap)) {
 901                                                         p_slot->hpc_ops->green_led_off(p_slot);
 902                                                         /* Wait for the command to complete */
 903                                                         wait_for_ctrl_irq (ctrl);
 904                                                 }
 905                                                 if (ATTN_LED(ctrl->ctrlcap)){
 906                                                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 907                                                         /* Wait for the command to complete */
 908                                                         wait_for_ctrl_irq (ctrl);
 909                                                 }
 910                                                 /* Done with exclusive hardware access */
 911                                                 up(&ctrl->crit_sect);
 912
 913                                                 break;
 914                                         default:
 915                                                 warn("Not a valid state\n");
 916                                                 return;
 917                                         }
 918                                         info(msg_button_cancel, p_slot->number);
 919                                         p_slot->state = STATIC_STATE;
 920                                 }
 921                                 /* ***********Button Pressed (No action on 1st press...) */
 922                                 else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
 923
 924                                         if (ATTN_BUTTN(ctrl->ctrlcap)) {
 925                                                 dbg("Button pressed\n");
 926                                                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 927                                                 if (getstatus) {
 928                                                         /* slot is on */
 929                                                         dbg("slot is on\n");
 930                                                         p_slot->state = BLINKINGOFF_STATE;
 931                                                         info(msg_button_off, p_slot->number);
 932                                                 } else {
 933                                                         /* slot is off */
 934                                                         dbg("slot is off\n");
 935                                                         p_slot->state = BLINKINGON_STATE;
 936                                                         info(msg_button_on, p_slot->number);
 937                                                 }
 938
 939                                                 /* Wait for exclusive access to hardware */
 940                                                 down(&ctrl->crit_sect);
 941
 942                                                 /* blink green LED and turn off amber */
 943                                                 if (PWR_LED(ctrl->ctrlcap)) {
 944                                                         p_slot->hpc_ops->green_led_blink(p_slot);
 945                                                         /* Wait for the command to complete */
 946                                                         wait_for_ctrl_irq (ctrl);
 947                                                 }
 948
 949                                                 if (ATTN_LED(ctrl->ctrlcap)) {
 950                                                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 951
 952                                                         /* Wait for the command to complete */
 953                                                         wait_for_ctrl_irq (ctrl);
 954                                                 }
 955
 956                                                 /* Done with exclusive hardware access */
 957                                                 up(&ctrl->crit_sect);
 958
 959                                                 init_timer(&p_slot->task_event);
 960                                                 p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
 961                                                 p_slot->task_event.function = (void (*)(unsigned long)) pushbutton_helper_thread;
 962                                                 p_slot->task_event.data = (unsigned long) p_slot;
 963
 964                                                 dbg("add_timer p_slot = %p\n", (void *) p_slot);
 965                                                 add_timer(&p_slot->task_event);
 966                                         }
 967                                 }
 968                                 /***********POWER FAULT********************/
 969                                 else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
 970                                         if (POWER_CTRL(ctrl->ctrlcap)) {
 971                                                 dbg("power fault\n");
 972                                                 /* Wait for exclusive access to hardware */
 973                                                 down(&ctrl->crit_sect);
 974
 975                                                 if (ATTN_LED(ctrl->ctrlcap)) {
 976                                                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 977                                                         wait_for_ctrl_irq (ctrl);
 978                                                 }
 979
 980                                                 if (PWR_LED(ctrl->ctrlcap)) {
 981                                                         p_slot->hpc_ops->green_led_off(p_slot);
 982                                                         wait_for_ctrl_irq (ctrl);
 983                                                 }
 984
 985                                                 /* Done with exclusive hardware access */
 986                                                 up(&ctrl->crit_sect);
 987                                         }
 988                                 }
 989                                 /***********SURPRISE REMOVAL********************/
 990                                 else if ((ctrl->event_queue[loop].event_type == INT_PRESENCE_ON) ||
 991                                         (ctrl->event_queue[loop].event_type == INT_PRESENCE_OFF)) {
 992                                         if (HP_SUPR_RM(ctrl->ctrlcap)) {
 993                                                 dbg("Surprise Removal\n");
 994                                                 if (p_slot) {
 995                                                         surprise_rm_pending = (unsigned long) p_slot;
 996                                                         up(&event_semaphore);
 997                                                         update_slot_info(p_slot);
 998                                                 }
 999                                         }
1000                                 } else {
1001                                         /* refresh notification */
1002                                         if (p_slot)
1003                                                 update_slot_info(p_slot);
1004                                 }
1005
1006                                 ctrl->event_queue[loop].event_type = 0;
1007
1008                                 change = 1;
1009                         }
1010                 }               /* End of FOR loop */
1011         }
1012 }
1013
1014
1015 int pciehp_enable_slot(struct slot *p_slot)
1016 {
1017         u8 getstatus = 0;
1018         int rc;
1019         struct pci_func *func;
1020
1021         func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
1022         if (!func) {
1023                 dbg("%s: Error! slot NULL\n", __FUNCTION__);
1024                 return 1;
1025         }
1026
1027         /* Check to see if (latch closed, card present, power off) */
1028         down(&p_slot->ctrl->crit_sect);
1029
1030         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
1031         if (rc || !getstatus) {
1032                 info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
1033                 up(&p_slot->ctrl->crit_sect);
1034                 return 1;
1035         }
1036         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
1037                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
1038                 if (rc || getstatus) {
1039                         info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
1040                         up(&p_slot->ctrl->crit_sect);
1041                         return 1;
1042                 }
1043         }
1044
1045         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
1046                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
1047                 if (rc || getstatus) {
1048                         info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
1049                         up(&p_slot->ctrl->crit_sect);
1050                         return 1;
1051                 }
1052         }
1053         up(&p_slot->ctrl->crit_sect);
1054
1055         slot_remove(func);
1056
1057         func = pciehp_slot_create(p_slot->bus);
1058         if (func == NULL)
1059                 return 1;
1060
1061         func->bus = p_slot->bus;
1062         func->device = p_slot->device;
1063         func->function = 0;
1064         func->configured = 0;
1065         func->is_a_board = 1;
1066
1067         /* We have to save the presence info for these slots */
1068         p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
1069         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
1070         func->switch_save = !getstatus? 0x10:0;
1071
1072         rc = board_added(func, p_slot->ctrl);
1073         if (rc) {
1074                 if (is_bridge(func))
1075                         bridge_slot_remove(func);
1076                 else
1077                         slot_remove(func);
1078
1079                 /* Setup slot structure with entry for empty slot */
1080                 func = pciehp_slot_create(p_slot->bus);
1081                 if (func == NULL)
1082                         return 1;       /* Out of memory */
1083
1084                 func->bus = p_slot->bus;
1085                 func->device = p_slot->device;
1086                 func->function = 0;
1087                 func->configured = 0;
1088                 func->is_a_board = 1;
1089
1090                 /* We have to save the presence info for these slots */
1091                 p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
1092                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
1093                 func->switch_save = !getstatus? 0x10:0;
1094         }
1095
1096         if (p_slot)
1097                 update_slot_info(p_slot);
1098
1099         return rc;
1100 }
1101
1102
1103 int pciehp_disable_slot(struct slot *p_slot)
1104 {
1105         u8 class_code, header_type, BCR;
1106         u8 index = 0;
1107         u8 getstatus = 0;
1108         u32 rc = 0;
1109         int ret = 0;
1110         unsigned int devfn;
1111         struct pci_bus *pci_bus = p_slot->ctrl->pci_dev->subordinate;
1112         struct pci_func *func;
1113
1114         if (!p_slot->ctrl)
1115                 return 1;
1116
1117         /* Check to see if (latch closed, card present, power on) */
1118         down(&p_slot->ctrl->crit_sect);
1119
1120         if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
1121                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
1122                 if (ret || !getstatus) {
1123                         info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
1124                         up(&p_slot->ctrl->crit_sect);
1125                         return 1;
1126                 }
1127         }
1128
1129         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
1130                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
1131                 if (ret || getstatus) {
1132                         info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
1133                         up(&p_slot->ctrl->crit_sect);
1134                         return 1;
1135                 }
1136         }
1137
1138         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
1139                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
1140                 if (ret || !getstatus) {
1141                         info("%s: already disabled slot(%x)\n", __FUNCTION__, p_slot->number);
1142                         up(&p_slot->ctrl->crit_sect);
1143                         return 1;
1144                 }
1145         }
1146
1147         up(&p_slot->ctrl->crit_sect);
1148
1149         func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);
1150
1151         /* Make sure there are no video controllers here
1152          * for all func of p_slot
1153          */
1154         while (func && !rc) {
1155                 pci_bus->number = func->bus;
1156                 devfn = PCI_DEVFN(func->device, func->function);
1157
1158                 /* Check the Class Code */
1159                 rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);
1160                 if (rc)
1161                         return rc;
1162
1163                 if (class_code == PCI_BASE_CLASS_DISPLAY) {
1164                         /* Display/Video adapter (not supported) */
1165                         rc = REMOVE_NOT_SUPPORTED;
1166                 } else {
1167                         /* See if it's a bridge */
1168                         rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
1169                         if (rc)
1170                                 return rc;
1171
1172                         /* If it's a bridge, check the VGA Enable bit */
1173                         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
1174                                 rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
1175                                 if (rc)
1176                                         return rc;
1177
1178                                 /* If the VGA Enable bit is set, remove isn't supported */
1179                                 if (BCR & PCI_BRIDGE_CTL_VGA) {
1180                                         rc = REMOVE_NOT_SUPPORTED;
1181                                 }
1182                         }
1183                 }
1184
1185                 func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);
1186         }
1187
1188         func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
1189         if ((func != NULL) && !rc) {
1190                 rc = remove_board(func, p_slot->ctrl);
1191         } else if (!rc)
1192                 rc = 1;
1193
1194         if (p_slot)
1195                 update_slot_info(p_slot);
1196
1197         return rc;
1198 }
1199