drivers/pci/hotplug/pciehp_ctrl.c

   1 /*
   2  * PCI Express Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/pci.h>
  35 #include <linux/workqueue.h>
  36 #include "../pci.h"
  37 #include "pciehp.h"
  38
  39 static void interrupt_event_handler(struct work_struct *work);
  40
  41 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  42 {
  43         struct event_info *info;
  44
  45         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  46         if (!info)
  47                 return -ENOMEM;
  48
  49         info->event_type = event_type;
  50         info->p_slot = p_slot;
  51         INIT_WORK(&info->work, interrupt_event_handler);
  52
  53         schedule_work(&info->work);
  54
  55         return 0;
  56 }
  57
  58 u8 pciehp_handle_attention_button(struct slot *p_slot)
  59 {
  60         u32 event_type;
  61
  62         /* Attention Button Change */
  63         dbg("pciehp:  Attention button interrupt received.\n");
  64
  65         /*
  66          *  Button pressed - See if need to TAKE ACTION!!!
  67          */
  68         info("Button pressed on Slot(%s)\n", p_slot->name);
  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
  81         /* Switch Change */
  82         dbg("pciehp:  Switch interrupt received.\n");
  83
  84         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  85         if (getstatus) {
  86                 /*
  87                  * Switch opened
  88                  */
  89                 info("Latch open on Slot(%s)\n", p_slot->name);
  90                 event_type = INT_SWITCH_OPEN;
  91         } else {
  92                 /*
  93                  *  Switch closed
  94                  */
  95                 info("Latch close on Slot(%s)\n", p_slot->name);
  96                 event_type = INT_SWITCH_CLOSE;
  97         }
  98
  99         queue_interrupt_event(p_slot, event_type);
 100
 101         return 1;
 102 }
 103
 104 u8 pciehp_handle_presence_change(struct slot *p_slot)
 105 {
 106         u32 event_type;
 107         u8 presence_save;
 108
 109         /* Presence Change */
 110         dbg("pciehp:  Presence/Notify input change.\n");
 111
 112         /* Switch is open, assume a presence change
 113          * Save the presence state
 114          */
 115         p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
 116         if (presence_save) {
 117                 /*
 118                  * Card Present
 119                  */
 120                 info("Card present on Slot(%s)\n", p_slot->name);
 121                 event_type = INT_PRESENCE_ON;
 122         } else {
 123                 /*
 124                  * Not Present
 125                  */
 126                 info("Card not present on Slot(%s)\n", p_slot->name);
 127                 event_type = INT_PRESENCE_OFF;
 128         }
 129
 130         queue_interrupt_event(p_slot, event_type);
 131
 132         return 1;
 133 }
 134
 135 u8 pciehp_handle_power_fault(struct slot *p_slot)
 136 {
 137         u32 event_type;
 138
 139         /* power fault */
 140         dbg("pciehp:  Power fault interrupt received.\n");
 141
 142         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 143                 /*
 144                  * power fault Cleared
 145                  */
 146                 info("Power fault cleared on Slot(%s)\n", p_slot->name);
 147                 event_type = INT_POWER_FAULT_CLEAR;
 148         } else {
 149                 /*
 150                  *   power fault
 151                  */
 152                 info("Power fault on Slot(%s)\n", p_slot->name);
 153                 event_type = INT_POWER_FAULT;
 154                 info("power fault bit %x set\n", 0);
 155         }
 156
 157         queue_interrupt_event(p_slot, event_type);
 158
 159         return 1;
 160 }
 161
 162 /* The following routines constitute the bulk of the
 163    hotplug controller logic
 164  */
 165
 166 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 167 {
 168         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 169         if (POWER_CTRL(ctrl)) {
 170                 if (pslot->hpc_ops->power_off_slot(pslot)) {
 171                         err("%s: Issue of Slot Power Off command failed\n",
 172                             __func__);
 173                         return;
 174                 }
 175         }
 176
 177         /*
 178          * After turning power off, we must wait for at least 1 second
 179          * before taking any action that relies on power having been
 180          * removed from the slot/adapter.
 181          */
 182         msleep(1000);
 183
 184         if (PWR_LED(ctrl))
 185                 pslot->hpc_ops->green_led_off(pslot);
 186
 187         if (ATTN_LED(ctrl)) {
 188                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 189                         err("%s: Issue of Set Attention Led command failed\n",
 190                             __func__);
 191                         return;
 192                 }
 193         }
 194 }
 195
 196 /**
 197  * board_added - Called after a board has been added to the system.
 198  * @p_slot: &slot where board is added
 199  *
 200  * Turns power on for the board.
 201  * Configures board.
 202  */
 203 static int board_added(struct slot *p_slot)
 204 {
 205         int retval = 0;
 206         struct controller *ctrl = p_slot->ctrl;
 207
 208         dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
 209                         __func__, p_slot->device,
 210                         ctrl->slot_device_offset, p_slot->hp_slot);
 211
 212         if (POWER_CTRL(ctrl)) {
 213                 /* Power on slot */
 214                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 215                 if (retval)
 216                         return retval;
 217         }
 218
 219         if (PWR_LED(ctrl))
 220                 p_slot->hpc_ops->green_led_blink(p_slot);
 221
 222         /* Wait for ~1 second */
 223         msleep(1000);
 224
 225         /* Check link training status */
 226         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 227         if (retval) {
 228                 err("%s: Failed to check link status\n", __func__);
 229                 set_slot_off(ctrl, p_slot);
 230                 return retval;
 231         }
 232
 233         /* Check for a power fault */
 234         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 235                 dbg("%s: power fault detected\n", __func__);
 236                 retval = POWER_FAILURE;
 237                 goto err_exit;
 238         }
 239
 240         retval = pciehp_configure_device(p_slot);
 241         if (retval) {
 242                 err("Cannot add device 0x%x:%x\n", p_slot->bus,
 243                     p_slot->device);
 244                 goto err_exit;
 245         }
 246
 247         /*
 248          * Some PCI Express root ports require fixup after hot-plug operation.
 249          */
 250         if (pcie_mch_quirk)
 251                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 252         if (PWR_LED(ctrl))
 253                 p_slot->hpc_ops->green_led_on(p_slot);
 254
 255         return 0;
 256
 257 err_exit:
 258         set_slot_off(ctrl, p_slot);
 259         return retval;
 260 }
 261
 262 /**
 263  * remove_board - Turns off slot and LEDs
 264  * @p_slot: slot where board is being removed
 265  */
 266 static int remove_board(struct slot *p_slot)
 267 {
 268         int retval = 0;
 269         struct controller *ctrl = p_slot->ctrl;
 270
 271         retval = pciehp_unconfigure_device(p_slot);
 272         if (retval)
 273                 return retval;
 274
 275         dbg("In %s, hp_slot = %d\n", __func__, p_slot->hp_slot);
 276
 277         if (POWER_CTRL(ctrl)) {
 278                 /* power off slot */
 279                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 280                 if (retval) {
 281                         err("%s: Issue of Slot Disable command failed\n",
 282                             __func__);
 283                         return retval;
 284                 }
 285         }
 286
 287         /*
 288          * After turning power off, we must wait for at least 1 second
 289          * before taking any action that relies on power having been
 290          * removed from the slot/adapter.
 291          */
 292         msleep(1000);
 293
 294         if (PWR_LED(ctrl))
 295                 /* turn off Green LED */
 296                 p_slot->hpc_ops->green_led_off(p_slot);
 297
 298         return 0;
 299 }
 300
 301 struct power_work_info {
 302         struct slot *p_slot;
 303         struct work_struct work;
 304 };
 305
 306 /**
 307  * pciehp_power_thread - handle pushbutton events
 308  * @work: &struct work_struct describing work to be done
 309  *
 310  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 311  * Handles all pending events and exits.
 312  */
 313 static void pciehp_power_thread(struct work_struct *work)
 314 {
 315         struct power_work_info *info =
 316                 container_of(work, struct power_work_info, work);
 317         struct slot *p_slot = info->p_slot;
 318
 319         mutex_lock(&p_slot->lock);
 320         switch (p_slot->state) {
 321         case POWEROFF_STATE:
 322                 mutex_unlock(&p_slot->lock);
 323                 dbg("%s: disabling bus:device(%x:%x)\n",
 324                     __func__, p_slot->bus, p_slot->device);
 325                 pciehp_disable_slot(p_slot);
 326                 mutex_lock(&p_slot->lock);
 327                 p_slot->state = STATIC_STATE;
 328                 break;
 329         case POWERON_STATE:
 330                 mutex_unlock(&p_slot->lock);
 331                 if (pciehp_enable_slot(p_slot) &&
 332                     PWR_LED(p_slot->ctrl))
 333                         p_slot->hpc_ops->green_led_off(p_slot);
 334                 mutex_lock(&p_slot->lock);
 335                 p_slot->state = STATIC_STATE;
 336                 break;
 337         default:
 338                 break;
 339         }
 340         mutex_unlock(&p_slot->lock);
 341
 342         kfree(info);
 343 }
 344
 345 void pciehp_queue_pushbutton_work(struct work_struct *work)
 346 {
 347         struct slot *p_slot = container_of(work, struct slot, work.work);
 348         struct power_work_info *info;
 349
 350         info = kmalloc(sizeof(*info), GFP_KERNEL);
 351         if (!info) {
 352                 err("%s: Cannot allocate memory\n", __func__);
 353                 return;
 354         }
 355         info->p_slot = p_slot;
 356         INIT_WORK(&info->work, pciehp_power_thread);
 357
 358         mutex_lock(&p_slot->lock);
 359         switch (p_slot->state) {
 360         case BLINKINGOFF_STATE:
 361                 p_slot->state = POWEROFF_STATE;
 362                 break;
 363         case BLINKINGON_STATE:
 364                 p_slot->state = POWERON_STATE;
 365                 break;
 366         default:
 367                 goto out;
 368         }
 369         queue_work(pciehp_wq, &info->work);
 370  out:
 371         mutex_unlock(&p_slot->lock);
 372 }
 373
 374 static int update_slot_info(struct slot *slot)
 375 {
 376         struct hotplug_slot_info *info;
 377         int result;
 378
 379         info = kmalloc(sizeof(*info), GFP_KERNEL);
 380         if (!info)
 381                 return -ENOMEM;
 382
 383         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 384         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 385         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 386         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 387
 388         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 389         kfree (info);
 390         return result;
 391 }
 392
 393 /*
 394  * Note: This function must be called with slot->lock held
 395  */
 396 static void handle_button_press_event(struct slot *p_slot)
 397 {
 398         struct controller *ctrl = p_slot->ctrl;
 399         u8 getstatus;
 400
 401         switch (p_slot->state) {
 402         case STATIC_STATE:
 403                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 404                 if (getstatus) {
 405                         p_slot->state = BLINKINGOFF_STATE;
 406                         info("PCI slot #%s - powering off due to button "
 407                              "press.\n", p_slot->name);
 408                 } else {
 409                         p_slot->state = BLINKINGON_STATE;
 410                         info("PCI slot #%s - powering on due to button "
 411                              "press.\n", p_slot->name);
 412                 }
 413                 /* blink green LED and turn off amber */
 414                 if (PWR_LED(ctrl))
 415                         p_slot->hpc_ops->green_led_blink(p_slot);
 416                 if (ATTN_LED(ctrl))
 417                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 418
 419                 schedule_delayed_work(&p_slot->work, 5*HZ);
 420                 break;
 421         case BLINKINGOFF_STATE:
 422         case BLINKINGON_STATE:
 423                 /*
 424                  * Cancel if we are still blinking; this means that we
 425                  * press the attention again before the 5 sec. limit
 426                  * expires to cancel hot-add or hot-remove
 427                  */
 428                 info("Button cancel on Slot(%s)\n", p_slot->name);
 429                 dbg("%s: button cancel\n", __func__);
 430                 cancel_delayed_work(&p_slot->work);
 431                 if (p_slot->state == BLINKINGOFF_STATE) {
 432                         if (PWR_LED(ctrl))
 433                                 p_slot->hpc_ops->green_led_on(p_slot);
 434                 } else {
 435                         if (PWR_LED(ctrl))
 436                                 p_slot->hpc_ops->green_led_off(p_slot);
 437                 }
 438                 if (ATTN_LED(ctrl))
 439                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 440                 info("PCI slot #%s - action canceled due to button press\n",
 441                      p_slot->name);
 442                 p_slot->state = STATIC_STATE;
 443                 break;
 444         case POWEROFF_STATE:
 445         case POWERON_STATE:
 446                 /*
 447                  * Ignore if the slot is on power-on or power-off state;
 448                  * this means that the previous attention button action
 449                  * to hot-add or hot-remove is undergoing
 450                  */
 451                 info("Button ignore on Slot(%s)\n", p_slot->name);
 452                 update_slot_info(p_slot);
 453                 break;
 454         default:
 455                 warn("Not a valid state\n");
 456                 break;
 457         }
 458 }
 459
 460 /*
 461  * Note: This function must be called with slot->lock held
 462  */
 463 static void handle_surprise_event(struct slot *p_slot)
 464 {
 465         u8 getstatus;
 466         struct power_work_info *info;
 467
 468         info = kmalloc(sizeof(*info), GFP_KERNEL);
 469         if (!info) {
 470                 err("%s: Cannot allocate memory\n", __func__);
 471                 return;
 472         }
 473         info->p_slot = p_slot;
 474         INIT_WORK(&info->work, pciehp_power_thread);
 475
 476         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 477         if (!getstatus)
 478                 p_slot->state = POWEROFF_STATE;
 479         else
 480                 p_slot->state = POWERON_STATE;
 481
 482         queue_work(pciehp_wq, &info->work);
 483 }
 484
 485 static void interrupt_event_handler(struct work_struct *work)
 486 {
 487         struct event_info *info = container_of(work, struct event_info, work);
 488         struct slot *p_slot = info->p_slot;
 489         struct controller *ctrl = p_slot->ctrl;
 490
 491         mutex_lock(&p_slot->lock);
 492         switch (info->event_type) {
 493         case INT_BUTTON_PRESS:
 494                 handle_button_press_event(p_slot);
 495                 break;
 496         case INT_POWER_FAULT:
 497                 if (!POWER_CTRL(ctrl))
 498                         break;
 499                 if (ATTN_LED(ctrl))
 500                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 501                 if (PWR_LED(ctrl))
 502                         p_slot->hpc_ops->green_led_off(p_slot);
 503                 break;
 504         case INT_PRESENCE_ON:
 505         case INT_PRESENCE_OFF:
 506                 if (!HP_SUPR_RM(ctrl))
 507                         break;
 508                 dbg("Surprise Removal\n");
 509                 update_slot_info(p_slot);
 510                 handle_surprise_event(p_slot);
 511                 break;
 512         default:
 513                 update_slot_info(p_slot);
 514                 break;
 515         }
 516         mutex_unlock(&p_slot->lock);
 517
 518         kfree(info);
 519 }
 520
 521 int pciehp_enable_slot(struct slot *p_slot)
 522 {
 523         u8 getstatus = 0;
 524         int rc;
 525
 526         /* Check to see if (latch closed, card present, power off) */
 527         mutex_lock(&p_slot->ctrl->crit_sect);
 528
 529         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 530         if (rc || !getstatus) {
 531                 info("%s: no adapter on slot(%s)\n", __func__,
 532                      p_slot->name);
 533                 mutex_unlock(&p_slot->ctrl->crit_sect);
 534                 return -ENODEV;
 535         }
 536         if (MRL_SENS(p_slot->ctrl)) {
 537                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 538                 if (rc || getstatus) {
 539                         info("%s: latch open on slot(%s)\n", __func__,
 540                              p_slot->name);
 541                         mutex_unlock(&p_slot->ctrl->crit_sect);
 542                         return -ENODEV;
 543                 }
 544         }
 545
 546         if (POWER_CTRL(p_slot->ctrl)) {
 547                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 548                 if (rc || getstatus) {
 549                         info("%s: already enabled on slot(%s)\n", __func__,
 550                              p_slot->name);
 551                         mutex_unlock(&p_slot->ctrl->crit_sect);
 552                         return -EINVAL;
 553                 }
 554         }
 555
 556         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 557
 558         rc = board_added(p_slot);
 559         if (rc) {
 560                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 561         }
 562
 563         update_slot_info(p_slot);
 564
 565         mutex_unlock(&p_slot->ctrl->crit_sect);
 566         return rc;
 567 }
 568
 569
 570 int pciehp_disable_slot(struct slot *p_slot)
 571 {
 572         u8 getstatus = 0;
 573         int ret = 0;
 574
 575         if (!p_slot->ctrl)
 576                 return 1;
 577
 578         /* Check to see if (latch closed, card present, power on) */
 579         mutex_lock(&p_slot->ctrl->crit_sect);
 580
 581         if (!HP_SUPR_RM(p_slot->ctrl)) {
 582                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 583                 if (ret || !getstatus) {
 584                         info("%s: no adapter on slot(%s)\n", __func__,
 585                              p_slot->name);
 586                         mutex_unlock(&p_slot->ctrl->crit_sect);
 587                         return -ENODEV;
 588                 }
 589         }
 590
 591         if (MRL_SENS(p_slot->ctrl)) {
 592                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 593                 if (ret || getstatus) {
 594                         info("%s: latch open on slot(%s)\n", __func__,
 595                              p_slot->name);
 596                         mutex_unlock(&p_slot->ctrl->crit_sect);
 597                         return -ENODEV;
 598                 }
 599         }
 600
 601         if (POWER_CTRL(p_slot->ctrl)) {
 602                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 603                 if (ret || !getstatus) {
 604                         info("%s: already disabled slot(%s)\n", __func__,
 605                              p_slot->name);
 606                         mutex_unlock(&p_slot->ctrl->crit_sect);
 607                         return -EINVAL;
 608                 }
 609         }
 610
 611         ret = remove_board(p_slot);
 612         update_slot_info(p_slot);
 613
 614         mutex_unlock(&p_slot->ctrl->crit_sect);
 615         return ret;
 616 }
 617
 618 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 619 {
 620         int retval = -ENODEV;
 621
 622         mutex_lock(&p_slot->lock);
 623         switch (p_slot->state) {
 624         case BLINKINGON_STATE:
 625                 cancel_delayed_work(&p_slot->work);
 626         case STATIC_STATE:
 627                 p_slot->state = POWERON_STATE;
 628                 mutex_unlock(&p_slot->lock);
 629                 retval = pciehp_enable_slot(p_slot);
 630                 mutex_lock(&p_slot->lock);
 631                 p_slot->state = STATIC_STATE;
 632                 break;
 633         case POWERON_STATE:
 634                 info("Slot %s is already in powering on state\n",
 635                      p_slot->name);
 636                 break;
 637         case BLINKINGOFF_STATE:
 638         case POWEROFF_STATE:
 639                 info("Already enabled on slot %s\n", p_slot->name);
 640                 break;
 641         default:
 642                 err("Not a valid state on slot %s\n", p_slot->name);
 643                 break;
 644         }
 645         mutex_unlock(&p_slot->lock);
 646
 647         return retval;
 648 }
 649
 650 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 651 {
 652         int retval = -ENODEV;
 653
 654         mutex_lock(&p_slot->lock);
 655         switch (p_slot->state) {
 656         case BLINKINGOFF_STATE:
 657                 cancel_delayed_work(&p_slot->work);
 658         case STATIC_STATE:
 659                 p_slot->state = POWEROFF_STATE;
 660                 mutex_unlock(&p_slot->lock);
 661                 retval = pciehp_disable_slot(p_slot);
 662                 mutex_lock(&p_slot->lock);
 663                 p_slot->state = STATIC_STATE;
 664                 break;
 665         case POWEROFF_STATE:
 666                 info("Slot %s is already in powering off state\n",
 667                      p_slot->name);
 668                 break;
 669         case BLINKINGON_STATE:
 670         case POWERON_STATE:
 671                 info("Already disabled on slot %s\n", p_slot->name);
 672                 break;
 673         default:
 674                 err("Not a valid state on slot %s\n", p_slot->name);
 675                 break;
 676         }
 677         mutex_unlock(&p_slot->lock);
 678
 679         return retval;
 680 }