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/slab.h>
  34 #include <linux/pci.h>
  35 #include "../pci.h"
  36 #include "pciehp.h"
  37
  38 static void interrupt_event_handler(struct work_struct *work);
  39
  40 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  41 {
  42         struct event_info *info;
  43
  44         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  45         if (!info)
  46                 return -ENOMEM;
  47
  48         info->event_type = event_type;
  49         info->p_slot = p_slot;
  50         INIT_WORK(&info->work, interrupt_event_handler);
  51
  52         queue_work(pciehp_wq, &info->work);
  53
  54         return 0;
  55 }
  56
  57 u8 pciehp_handle_attention_button(struct slot *p_slot)
  58 {
  59         u32 event_type;
  60         struct controller *ctrl = p_slot->ctrl;
  61
  62         /* Attention Button Change */
  63         ctrl_dbg(ctrl, "Attention button interrupt received\n");
  64
  65         /*
  66          *  Button pressed - See if need to TAKE ACTION!!!
  67          */
  68         ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
  69         event_type = INT_BUTTON_PRESS;
  70
  71         queue_interrupt_event(p_slot, event_type);
  72
  73         return 0;
  74 }
  75
  76 u8 pciehp_handle_switch_change(struct slot *p_slot)
  77 {
  78         u8 getstatus;
  79         u32 event_type;
  80         struct controller *ctrl = p_slot->ctrl;
  81
  82         /* Switch Change */
  83         ctrl_dbg(ctrl, "Switch interrupt received\n");
  84
  85         pciehp_get_latch_status(p_slot, &getstatus);
  86         if (getstatus) {
  87                 /*
  88                  * Switch opened
  89                  */
  90                 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
  91                 event_type = INT_SWITCH_OPEN;
  92         } else {
  93                 /*
  94                  *  Switch closed
  95                  */
  96                 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
  97                 event_type = INT_SWITCH_CLOSE;
  98         }
  99
 100         queue_interrupt_event(p_slot, event_type);
 101
 102         return 1;
 103 }
 104
 105 u8 pciehp_handle_presence_change(struct slot *p_slot)
 106 {
 107         u32 event_type;
 108         u8 presence_save;
 109         struct controller *ctrl = p_slot->ctrl;
 110
 111         /* Presence Change */
 112         ctrl_dbg(ctrl, "Presence/Notify input change\n");
 113
 114         /* Switch is open, assume a presence change
 115          * Save the presence state
 116          */
 117         pciehp_get_adapter_status(p_slot, &presence_save);
 118         if (presence_save) {
 119                 /*
 120                  * Card Present
 121                  */
 122                 ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
 123                 event_type = INT_PRESENCE_ON;
 124         } else {
 125                 /*
 126                  * Not Present
 127                  */
 128                 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
 129                           slot_name(p_slot));
 130                 event_type = INT_PRESENCE_OFF;
 131         }
 132
 133         queue_interrupt_event(p_slot, event_type);
 134
 135         return 1;
 136 }
 137
 138 u8 pciehp_handle_power_fault(struct slot *p_slot)
 139 {
 140         u32 event_type;
 141         struct controller *ctrl = p_slot->ctrl;
 142
 143         /* power fault */
 144         ctrl_dbg(ctrl, "Power fault interrupt received\n");
 145         ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
 146         event_type = INT_POWER_FAULT;
 147         ctrl_info(ctrl, "Power fault bit %x set\n", 0);
 148         queue_interrupt_event(p_slot, event_type);
 149
 150         return 1;
 151 }
 152
 153 /* The following routines constitute the bulk of the
 154    hotplug controller logic
 155  */
 156
 157 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 158 {
 159         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 160         if (POWER_CTRL(ctrl)) {
 161                 if (pciehp_power_off_slot(pslot)) {
 162                         ctrl_err(ctrl,
 163                                  "Issue of Slot Power Off command failed\n");
 164                         return;
 165                 }
 166                 /*
 167                  * After turning power off, we must wait for at least 1 second
 168                  * before taking any action that relies on power having been
 169                  * removed from the slot/adapter.
 170                  */
 171                 msleep(1000);
 172         }
 173
 174         if (PWR_LED(ctrl))
 175                 pciehp_green_led_off(pslot);
 176
 177         if (ATTN_LED(ctrl)) {
 178                 if (pciehp_set_attention_status(pslot, 1)) {
 179                         ctrl_err(ctrl,
 180                                  "Issue of Set Attention Led command failed\n");
 181                         return;
 182                 }
 183         }
 184 }
 185
 186 /**
 187  * board_added - Called after a board has been added to the system.
 188  * @p_slot: &slot where board is added
 189  *
 190  * Turns power on for the board.
 191  * Configures board.
 192  */
 193 static int board_added(struct slot *p_slot)
 194 {
 195         int retval = 0;
 196         struct controller *ctrl = p_slot->ctrl;
 197         struct pci_bus *parent = ctrl->pcie->port->subordinate;
 198
 199         if (POWER_CTRL(ctrl)) {
 200                 /* Power on slot */
 201                 retval = pciehp_power_on_slot(p_slot);
 202                 if (retval)
 203                         return retval;
 204         }
 205
 206         if (PWR_LED(ctrl))
 207                 pciehp_green_led_blink(p_slot);
 208
 209         /* Check link training status */
 210         retval = pciehp_check_link_status(ctrl);
 211         if (retval) {
 212                 ctrl_err(ctrl, "Failed to check link status\n");
 213                 goto err_exit;
 214         }
 215
 216         /* Wait for 1 second after checking link training status */
 217         msleep(1000);
 218
 219         /* Check for a power fault */
 220         if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
 221                 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
 222                 retval = -EIO;
 223                 goto err_exit;
 224         }
 225
 226         retval = pciehp_configure_device(p_slot);
 227         if (retval) {
 228                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
 229                          pci_domain_nr(parent), parent->number);
 230                 goto err_exit;
 231         }
 232
 233         if (PWR_LED(ctrl))
 234                 pciehp_green_led_on(p_slot);
 235
 236         return 0;
 237
 238 err_exit:
 239         set_slot_off(ctrl, p_slot);
 240         return retval;
 241 }
 242
 243 /**
 244  * remove_board - Turns off slot and LEDs
 245  * @p_slot: slot where board is being removed
 246  */
 247 static int remove_board(struct slot *p_slot)
 248 {
 249         int retval = 0;
 250         struct controller *ctrl = p_slot->ctrl;
 251
 252         retval = pciehp_unconfigure_device(p_slot);
 253         if (retval)
 254                 return retval;
 255
 256         if (POWER_CTRL(ctrl)) {
 257                 /* power off slot */
 258                 retval = pciehp_power_off_slot(p_slot);
 259                 if (retval) {
 260                         ctrl_err(ctrl,
 261                                  "Issue of Slot Disable command failed\n");
 262                         return retval;
 263                 }
 264                 /*
 265                  * After turning power off, we must wait for at least 1 second
 266                  * before taking any action that relies on power having been
 267                  * removed from the slot/adapter.
 268                  */
 269                 msleep(1000);
 270         }
 271
 272         /* turn off Green LED */
 273         if (PWR_LED(ctrl))
 274                 pciehp_green_led_off(p_slot);
 275
 276         return 0;
 277 }
 278
 279 struct power_work_info {
 280         struct slot *p_slot;
 281         struct work_struct work;
 282 };
 283
 284 /**
 285  * pciehp_power_thread - handle pushbutton events
 286  * @work: &struct work_struct describing work to be done
 287  *
 288  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 289  * Handles all pending events and exits.
 290  */
 291 static void pciehp_power_thread(struct work_struct *work)
 292 {
 293         struct power_work_info *info =
 294                 container_of(work, struct power_work_info, work);
 295         struct slot *p_slot = info->p_slot;
 296
 297         mutex_lock(&p_slot->lock);
 298         switch (p_slot->state) {
 299         case POWEROFF_STATE:
 300                 mutex_unlock(&p_slot->lock);
 301                 ctrl_dbg(p_slot->ctrl,
 302                          "Disabling domain:bus:device=%04x:%02x:00\n",
 303                          pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
 304                          p_slot->ctrl->pcie->port->subordinate->number);
 305                 pciehp_disable_slot(p_slot);
 306                 mutex_lock(&p_slot->lock);
 307                 p_slot->state = STATIC_STATE;
 308                 break;
 309         case POWERON_STATE:
 310                 mutex_unlock(&p_slot->lock);
 311                 if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
 312                         pciehp_green_led_off(p_slot);
 313                 mutex_lock(&p_slot->lock);
 314                 p_slot->state = STATIC_STATE;
 315                 break;
 316         default:
 317                 break;
 318         }
 319         mutex_unlock(&p_slot->lock);
 320
 321         kfree(info);
 322 }
 323
 324 void pciehp_queue_pushbutton_work(struct work_struct *work)
 325 {
 326         struct slot *p_slot = container_of(work, struct slot, work.work);
 327         struct power_work_info *info;
 328
 329         info = kmalloc(sizeof(*info), GFP_KERNEL);
 330         if (!info) {
 331                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 332                          __func__);
 333                 return;
 334         }
 335         info->p_slot = p_slot;
 336         INIT_WORK(&info->work, pciehp_power_thread);
 337
 338         mutex_lock(&p_slot->lock);
 339         switch (p_slot->state) {
 340         case BLINKINGOFF_STATE:
 341                 p_slot->state = POWEROFF_STATE;
 342                 break;
 343         case BLINKINGON_STATE:
 344                 p_slot->state = POWERON_STATE;
 345                 break;
 346         default:
 347                 kfree(info);
 348                 goto out;
 349         }
 350         queue_work(pciehp_ordered_wq, &info->work);
 351  out:
 352         mutex_unlock(&p_slot->lock);
 353 }
 354
 355 /*
 356  * Note: This function must be called with slot->lock held
 357  */
 358 static void handle_button_press_event(struct slot *p_slot)
 359 {
 360         struct controller *ctrl = p_slot->ctrl;
 361         u8 getstatus;
 362
 363         switch (p_slot->state) {
 364         case STATIC_STATE:
 365                 pciehp_get_power_status(p_slot, &getstatus);
 366                 if (getstatus) {
 367                         p_slot->state = BLINKINGOFF_STATE;
 368                         ctrl_info(ctrl,
 369                                   "PCI slot #%s - powering off due to button "
 370                                   "press.\n", slot_name(p_slot));
 371                 } else {
 372                         p_slot->state = BLINKINGON_STATE;
 373                         ctrl_info(ctrl,
 374                                   "PCI slot #%s - powering on due to button "
 375                                   "press.\n", slot_name(p_slot));
 376                 }
 377                 /* blink green LED and turn off amber */
 378                 if (PWR_LED(ctrl))
 379                         pciehp_green_led_blink(p_slot);
 380                 if (ATTN_LED(ctrl))
 381                         pciehp_set_attention_status(p_slot, 0);
 382
 383                 queue_delayed_work(pciehp_wq, &p_slot->work, 5*HZ);
 384                 break;
 385         case BLINKINGOFF_STATE:
 386         case BLINKINGON_STATE:
 387                 /*
 388                  * Cancel if we are still blinking; this means that we
 389                  * press the attention again before the 5 sec. limit
 390                  * expires to cancel hot-add or hot-remove
 391                  */
 392                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
 393                 cancel_delayed_work(&p_slot->work);
 394                 if (p_slot->state == BLINKINGOFF_STATE) {
 395                         if (PWR_LED(ctrl))
 396                                 pciehp_green_led_on(p_slot);
 397                 } else {
 398                         if (PWR_LED(ctrl))
 399                                 pciehp_green_led_off(p_slot);
 400                 }
 401                 if (ATTN_LED(ctrl))
 402                         pciehp_set_attention_status(p_slot, 0);
 403                 ctrl_info(ctrl, "PCI slot #%s - action canceled "
 404                           "due to button press\n", slot_name(p_slot));
 405                 p_slot->state = STATIC_STATE;
 406                 break;
 407         case POWEROFF_STATE:
 408         case POWERON_STATE:
 409                 /*
 410                  * Ignore if the slot is on power-on or power-off state;
 411                  * this means that the previous attention button action
 412                  * to hot-add or hot-remove is undergoing
 413                  */
 414                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
 415                 break;
 416         default:
 417                 ctrl_warn(ctrl, "Not a valid state\n");
 418                 break;
 419         }
 420 }
 421
 422 /*
 423  * Note: This function must be called with slot->lock held
 424  */
 425 static void handle_surprise_event(struct slot *p_slot)
 426 {
 427         u8 getstatus;
 428         struct power_work_info *info;
 429
 430         info = kmalloc(sizeof(*info), GFP_KERNEL);
 431         if (!info) {
 432                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 433                          __func__);
 434                 return;
 435         }
 436         info->p_slot = p_slot;
 437         INIT_WORK(&info->work, pciehp_power_thread);
 438
 439         pciehp_get_adapter_status(p_slot, &getstatus);
 440         if (!getstatus)
 441                 p_slot->state = POWEROFF_STATE;
 442         else
 443                 p_slot->state = POWERON_STATE;
 444
 445         queue_work(pciehp_ordered_wq, &info->work);
 446 }
 447
 448 static void interrupt_event_handler(struct work_struct *work)
 449 {
 450         struct event_info *info = container_of(work, struct event_info, work);
 451         struct slot *p_slot = info->p_slot;
 452         struct controller *ctrl = p_slot->ctrl;
 453
 454         mutex_lock(&p_slot->lock);
 455         switch (info->event_type) {
 456         case INT_BUTTON_PRESS:
 457                 handle_button_press_event(p_slot);
 458                 break;
 459         case INT_POWER_FAULT:
 460                 if (!POWER_CTRL(ctrl))
 461                         break;
 462                 if (ATTN_LED(ctrl))
 463                         pciehp_set_attention_status(p_slot, 1);
 464                 if (PWR_LED(ctrl))
 465                         pciehp_green_led_off(p_slot);
 466                 break;
 467         case INT_PRESENCE_ON:
 468         case INT_PRESENCE_OFF:
 469                 if (!HP_SUPR_RM(ctrl))
 470                         break;
 471                 ctrl_dbg(ctrl, "Surprise Removal\n");
 472                 handle_surprise_event(p_slot);
 473                 break;
 474         default:
 475                 break;
 476         }
 477         mutex_unlock(&p_slot->lock);
 478
 479         kfree(info);
 480 }
 481
 482 int pciehp_enable_slot(struct slot *p_slot)
 483 {
 484         u8 getstatus = 0;
 485         int rc;
 486         struct controller *ctrl = p_slot->ctrl;
 487
 488         rc = pciehp_get_adapter_status(p_slot, &getstatus);
 489         if (rc || !getstatus) {
 490                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 491                 return -ENODEV;
 492         }
 493         if (MRL_SENS(p_slot->ctrl)) {
 494                 rc = pciehp_get_latch_status(p_slot, &getstatus);
 495                 if (rc || getstatus) {
 496                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 497                                   slot_name(p_slot));
 498                         return -ENODEV;
 499                 }
 500         }
 501
 502         if (POWER_CTRL(p_slot->ctrl)) {
 503                 rc = pciehp_get_power_status(p_slot, &getstatus);
 504                 if (rc || getstatus) {
 505                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 506                                   slot_name(p_slot));
 507                         return -EINVAL;
 508                 }
 509         }
 510
 511         pciehp_get_latch_status(p_slot, &getstatus);
 512
 513         rc = board_added(p_slot);
 514         if (rc) {
 515                 pciehp_get_latch_status(p_slot, &getstatus);
 516         }
 517         return rc;
 518 }
 519
 520
 521 int pciehp_disable_slot(struct slot *p_slot)
 522 {
 523         u8 getstatus = 0;
 524         int ret = 0;
 525         struct controller *ctrl = p_slot->ctrl;
 526
 527         if (!p_slot->ctrl)
 528                 return 1;
 529
 530         if (!HP_SUPR_RM(p_slot->ctrl)) {
 531                 ret = pciehp_get_adapter_status(p_slot, &getstatus);
 532                 if (ret || !getstatus) {
 533                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
 534                                   slot_name(p_slot));
 535                         return -ENODEV;
 536                 }
 537         }
 538
 539         if (MRL_SENS(p_slot->ctrl)) {
 540                 ret = pciehp_get_latch_status(p_slot, &getstatus);
 541                 if (ret || getstatus) {
 542                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 543                                   slot_name(p_slot));
 544                         return -ENODEV;
 545                 }
 546         }
 547
 548         if (POWER_CTRL(p_slot->ctrl)) {
 549                 ret = pciehp_get_power_status(p_slot, &getstatus);
 550                 if (ret || !getstatus) {
 551                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 552                                   slot_name(p_slot));
 553                         return -EINVAL;
 554                 }
 555         }
 556
 557         return remove_board(p_slot);
 558 }
 559
 560 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 561 {
 562         int retval = -ENODEV;
 563         struct controller *ctrl = p_slot->ctrl;
 564
 565         mutex_lock(&p_slot->lock);
 566         switch (p_slot->state) {
 567         case BLINKINGON_STATE:
 568                 cancel_delayed_work(&p_slot->work);
 569         case STATIC_STATE:
 570                 p_slot->state = POWERON_STATE;
 571                 mutex_unlock(&p_slot->lock);
 572                 retval = pciehp_enable_slot(p_slot);
 573                 mutex_lock(&p_slot->lock);
 574                 p_slot->state = STATIC_STATE;
 575                 break;
 576         case POWERON_STATE:
 577                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 578                           slot_name(p_slot));
 579                 break;
 580         case BLINKINGOFF_STATE:
 581         case POWEROFF_STATE:
 582                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 583                           slot_name(p_slot));
 584                 break;
 585         default:
 586                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 587                          slot_name(p_slot));
 588                 break;
 589         }
 590         mutex_unlock(&p_slot->lock);
 591
 592         return retval;
 593 }
 594
 595 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 596 {
 597         int retval = -ENODEV;
 598         struct controller *ctrl = p_slot->ctrl;
 599
 600         mutex_lock(&p_slot->lock);
 601         switch (p_slot->state) {
 602         case BLINKINGOFF_STATE:
 603                 cancel_delayed_work(&p_slot->work);
 604         case STATIC_STATE:
 605                 p_slot->state = POWEROFF_STATE;
 606                 mutex_unlock(&p_slot->lock);
 607                 retval = pciehp_disable_slot(p_slot);
 608                 mutex_lock(&p_slot->lock);
 609                 p_slot->state = STATIC_STATE;
 610                 break;
 611         case POWEROFF_STATE:
 612                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 613                           slot_name(p_slot));
 614                 break;
 615         case BLINKINGON_STATE:
 616         case POWERON_STATE:
 617                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 618                           slot_name(p_slot));
 619                 break;
 620         default:
 621                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 622                          slot_name(p_slot));
 623                 break;
 624         }
 625         mutex_unlock(&p_slot->lock);
 626
 627         return retval;
 628 }