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/pci.h>
  34 #include <linux/workqueue.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         schedule_work(&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         /* Check for a power fault */
 217         if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
 218                 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
 219                 retval = -EIO;
 220                 goto err_exit;
 221         }
 222
 223         retval = pciehp_configure_device(p_slot);
 224         if (retval) {
 225                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
 226                          pci_domain_nr(parent), parent->number);
 227                 goto err_exit;
 228         }
 229
 230         if (PWR_LED(ctrl))
 231                 pciehp_green_led_on(p_slot);
 232
 233         return 0;
 234
 235 err_exit:
 236         set_slot_off(ctrl, p_slot);
 237         return retval;
 238 }
 239
 240 /**
 241  * remove_board - Turns off slot and LEDs
 242  * @p_slot: slot where board is being removed
 243  */
 244 static int remove_board(struct slot *p_slot)
 245 {
 246         int retval = 0;
 247         struct controller *ctrl = p_slot->ctrl;
 248
 249         retval = pciehp_unconfigure_device(p_slot);
 250         if (retval)
 251                 return retval;
 252
 253         if (POWER_CTRL(ctrl)) {
 254                 /* power off slot */
 255                 retval = pciehp_power_off_slot(p_slot);
 256                 if (retval) {
 257                         ctrl_err(ctrl,
 258                                  "Issue of Slot Disable command failed\n");
 259                         return retval;
 260                 }
 261                 /*
 262                  * After turning power off, we must wait for at least 1 second
 263                  * before taking any action that relies on power having been
 264                  * removed from the slot/adapter.
 265                  */
 266                 msleep(1000);
 267         }
 268
 269         /* turn off Green LED */
 270         if (PWR_LED(ctrl))
 271                 pciehp_green_led_off(p_slot);
 272
 273         return 0;
 274 }
 275
 276 struct power_work_info {
 277         struct slot *p_slot;
 278         struct work_struct work;
 279 };
 280
 281 /**
 282  * pciehp_power_thread - handle pushbutton events
 283  * @work: &struct work_struct describing work to be done
 284  *
 285  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 286  * Handles all pending events and exits.
 287  */
 288 static void pciehp_power_thread(struct work_struct *work)
 289 {
 290         struct power_work_info *info =
 291                 container_of(work, struct power_work_info, work);
 292         struct slot *p_slot = info->p_slot;
 293
 294         mutex_lock(&p_slot->lock);
 295         switch (p_slot->state) {
 296         case POWEROFF_STATE:
 297                 mutex_unlock(&p_slot->lock);
 298                 ctrl_dbg(p_slot->ctrl,
 299                          "Disabling domain:bus:device=%04x:%02x:00\n",
 300                          pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
 301                          p_slot->ctrl->pcie->port->subordinate->number);
 302                 pciehp_disable_slot(p_slot);
 303                 mutex_lock(&p_slot->lock);
 304                 p_slot->state = STATIC_STATE;
 305                 break;
 306         case POWERON_STATE:
 307                 mutex_unlock(&p_slot->lock);
 308                 if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
 309                         pciehp_green_led_off(p_slot);
 310                 mutex_lock(&p_slot->lock);
 311                 p_slot->state = STATIC_STATE;
 312                 break;
 313         default:
 314                 break;
 315         }
 316         mutex_unlock(&p_slot->lock);
 317
 318         kfree(info);
 319 }
 320
 321 void pciehp_queue_pushbutton_work(struct work_struct *work)
 322 {
 323         struct slot *p_slot = container_of(work, struct slot, work.work);
 324         struct power_work_info *info;
 325
 326         info = kmalloc(sizeof(*info), GFP_KERNEL);
 327         if (!info) {
 328                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 329                          __func__);
 330                 return;
 331         }
 332         info->p_slot = p_slot;
 333         INIT_WORK(&info->work, pciehp_power_thread);
 334
 335         mutex_lock(&p_slot->lock);
 336         switch (p_slot->state) {
 337         case BLINKINGOFF_STATE:
 338                 p_slot->state = POWEROFF_STATE;
 339                 break;
 340         case BLINKINGON_STATE:
 341                 p_slot->state = POWERON_STATE;
 342                 break;
 343         default:
 344                 kfree(info);
 345                 goto out;
 346         }
 347         queue_work(pciehp_wq, &info->work);
 348  out:
 349         mutex_unlock(&p_slot->lock);
 350 }
 351
 352 /*
 353  * Note: This function must be called with slot->lock held
 354  */
 355 static void handle_button_press_event(struct slot *p_slot)
 356 {
 357         struct controller *ctrl = p_slot->ctrl;
 358         u8 getstatus;
 359
 360         switch (p_slot->state) {
 361         case STATIC_STATE:
 362                 pciehp_get_power_status(p_slot, &getstatus);
 363                 if (getstatus) {
 364                         p_slot->state = BLINKINGOFF_STATE;
 365                         ctrl_info(ctrl,
 366                                   "PCI slot #%s - powering off due to button "
 367                                   "press.\n", slot_name(p_slot));
 368                 } else {
 369                         p_slot->state = BLINKINGON_STATE;
 370                         ctrl_info(ctrl,
 371                                   "PCI slot #%s - powering on due to button "
 372                                   "press.\n", slot_name(p_slot));
 373                 }
 374                 /* blink green LED and turn off amber */
 375                 if (PWR_LED(ctrl))
 376                         pciehp_green_led_blink(p_slot);
 377                 if (ATTN_LED(ctrl))
 378                         pciehp_set_attention_status(p_slot, 0);
 379
 380                 schedule_delayed_work(&p_slot->work, 5*HZ);
 381                 break;
 382         case BLINKINGOFF_STATE:
 383         case BLINKINGON_STATE:
 384                 /*
 385                  * Cancel if we are still blinking; this means that we
 386                  * press the attention again before the 5 sec. limit
 387                  * expires to cancel hot-add or hot-remove
 388                  */
 389                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
 390                 cancel_delayed_work(&p_slot->work);
 391                 if (p_slot->state == BLINKINGOFF_STATE) {
 392                         if (PWR_LED(ctrl))
 393                                 pciehp_green_led_on(p_slot);
 394                 } else {
 395                         if (PWR_LED(ctrl))
 396                                 pciehp_green_led_off(p_slot);
 397                 }
 398                 if (ATTN_LED(ctrl))
 399                         pciehp_set_attention_status(p_slot, 0);
 400                 ctrl_info(ctrl, "PCI slot #%s - action canceled "
 401                           "due to button press\n", slot_name(p_slot));
 402                 p_slot->state = STATIC_STATE;
 403                 break;
 404         case POWEROFF_STATE:
 405         case POWERON_STATE:
 406                 /*
 407                  * Ignore if the slot is on power-on or power-off state;
 408                  * this means that the previous attention button action
 409                  * to hot-add or hot-remove is undergoing
 410                  */
 411                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
 412                 break;
 413         default:
 414                 ctrl_warn(ctrl, "Not a valid state\n");
 415                 break;
 416         }
 417 }
 418
 419 /*
 420  * Note: This function must be called with slot->lock held
 421  */
 422 static void handle_surprise_event(struct slot *p_slot)
 423 {
 424         u8 getstatus;
 425         struct power_work_info *info;
 426
 427         info = kmalloc(sizeof(*info), GFP_KERNEL);
 428         if (!info) {
 429                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 430                          __func__);
 431                 return;
 432         }
 433         info->p_slot = p_slot;
 434         INIT_WORK(&info->work, pciehp_power_thread);
 435
 436         pciehp_get_adapter_status(p_slot, &getstatus);
 437         if (!getstatus)
 438                 p_slot->state = POWEROFF_STATE;
 439         else
 440                 p_slot->state = POWERON_STATE;
 441
 442         queue_work(pciehp_wq, &info->work);
 443 }
 444
 445 static void interrupt_event_handler(struct work_struct *work)
 446 {
 447         struct event_info *info = container_of(work, struct event_info, work);
 448         struct slot *p_slot = info->p_slot;
 449         struct controller *ctrl = p_slot->ctrl;
 450
 451         mutex_lock(&p_slot->lock);
 452         switch (info->event_type) {
 453         case INT_BUTTON_PRESS:
 454                 handle_button_press_event(p_slot);
 455                 break;
 456         case INT_POWER_FAULT:
 457                 if (!POWER_CTRL(ctrl))
 458                         break;
 459                 if (ATTN_LED(ctrl))
 460                         pciehp_set_attention_status(p_slot, 1);
 461                 if (PWR_LED(ctrl))
 462                         pciehp_green_led_off(p_slot);
 463                 break;
 464         case INT_PRESENCE_ON:
 465         case INT_PRESENCE_OFF:
 466                 if (!HP_SUPR_RM(ctrl))
 467                         break;
 468                 ctrl_dbg(ctrl, "Surprise Removal\n");
 469                 handle_surprise_event(p_slot);
 470                 break;
 471         default:
 472                 break;
 473         }
 474         mutex_unlock(&p_slot->lock);
 475
 476         kfree(info);
 477 }
 478
 479 int pciehp_enable_slot(struct slot *p_slot)
 480 {
 481         u8 getstatus = 0;
 482         int rc;
 483         struct controller *ctrl = p_slot->ctrl;
 484
 485         rc = pciehp_get_adapter_status(p_slot, &getstatus);
 486         if (rc || !getstatus) {
 487                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 488                 return -ENODEV;
 489         }
 490         if (MRL_SENS(p_slot->ctrl)) {
 491                 rc = pciehp_get_latch_status(p_slot, &getstatus);
 492                 if (rc || getstatus) {
 493                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 494                                   slot_name(p_slot));
 495                         return -ENODEV;
 496                 }
 497         }
 498
 499         if (POWER_CTRL(p_slot->ctrl)) {
 500                 rc = pciehp_get_power_status(p_slot, &getstatus);
 501                 if (rc || getstatus) {
 502                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 503                                   slot_name(p_slot));
 504                         return -EINVAL;
 505                 }
 506         }
 507
 508         pciehp_get_latch_status(p_slot, &getstatus);
 509
 510         rc = board_added(p_slot);
 511         if (rc) {
 512                 pciehp_get_latch_status(p_slot, &getstatus);
 513         }
 514         return rc;
 515 }
 516
 517
 518 int pciehp_disable_slot(struct slot *p_slot)
 519 {
 520         u8 getstatus = 0;
 521         int ret = 0;
 522         struct controller *ctrl = p_slot->ctrl;
 523
 524         if (!p_slot->ctrl)
 525                 return 1;
 526
 527         if (!HP_SUPR_RM(p_slot->ctrl)) {
 528                 ret = pciehp_get_adapter_status(p_slot, &getstatus);
 529                 if (ret || !getstatus) {
 530                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
 531                                   slot_name(p_slot));
 532                         return -ENODEV;
 533                 }
 534         }
 535
 536         if (MRL_SENS(p_slot->ctrl)) {
 537                 ret = pciehp_get_latch_status(p_slot, &getstatus);
 538                 if (ret || getstatus) {
 539                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 540                                   slot_name(p_slot));
 541                         return -ENODEV;
 542                 }
 543         }
 544
 545         if (POWER_CTRL(p_slot->ctrl)) {
 546                 ret = pciehp_get_power_status(p_slot, &getstatus);
 547                 if (ret || !getstatus) {
 548                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 549                                   slot_name(p_slot));
 550                         return -EINVAL;
 551                 }
 552         }
 553
 554         return remove_board(p_slot);
 555 }
 556
 557 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 558 {
 559         int retval = -ENODEV;
 560         struct controller *ctrl = p_slot->ctrl;
 561
 562         mutex_lock(&p_slot->lock);
 563         switch (p_slot->state) {
 564         case BLINKINGON_STATE:
 565                 cancel_delayed_work(&p_slot->work);
 566         case STATIC_STATE:
 567                 p_slot->state = POWERON_STATE;
 568                 mutex_unlock(&p_slot->lock);
 569                 retval = pciehp_enable_slot(p_slot);
 570                 mutex_lock(&p_slot->lock);
 571                 p_slot->state = STATIC_STATE;
 572                 break;
 573         case POWERON_STATE:
 574                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 575                           slot_name(p_slot));
 576                 break;
 577         case BLINKINGOFF_STATE:
 578         case POWEROFF_STATE:
 579                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 580                           slot_name(p_slot));
 581                 break;
 582         default:
 583                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 584                          slot_name(p_slot));
 585                 break;
 586         }
 587         mutex_unlock(&p_slot->lock);
 588
 589         return retval;
 590 }
 591
 592 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 593 {
 594         int retval = -ENODEV;
 595         struct controller *ctrl = p_slot->ctrl;
 596
 597         mutex_lock(&p_slot->lock);
 598         switch (p_slot->state) {
 599         case BLINKINGOFF_STATE:
 600                 cancel_delayed_work(&p_slot->work);
 601         case STATIC_STATE:
 602                 p_slot->state = POWEROFF_STATE;
 603                 mutex_unlock(&p_slot->lock);
 604                 retval = pciehp_disable_slot(p_slot);
 605                 mutex_lock(&p_slot->lock);
 606                 p_slot->state = STATIC_STATE;
 607                 break;
 608         case POWEROFF_STATE:
 609                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 610                           slot_name(p_slot));
 611                 break;
 612         case BLINKINGON_STATE:
 613         case POWERON_STATE:
 614                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 615                           slot_name(p_slot));
 616                 break;
 617         default:
 618                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 619                          slot_name(p_slot));
 620                 break;
 621         }
 622         mutex_unlock(&p_slot->lock);
 623
 624         return retval;
 625 }