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 39static void interrupt_event_handler(struct work_struct *work); 40static int pciehp_enable_slot(struct slot *p_slot); 41static int pciehp_disable_slot(struct slot *p_slot); 42 43static int queue_interrupt_event(struct slot *p_slot, u32 event_type) 44{ 45 struct event_info *info; 46 47 info = kmalloc(sizeof(*info), GFP_ATOMIC); 48 if (!info) 49 return -ENOMEM; 50 51 info->event_type = event_type; 52 info->p_slot = p_slot; 53 INIT_WORK(&info->work, interrupt_event_handler); 54 55 schedule_work(&info->work); 56 57 return 0; 58} 59 60u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl) 61{ 62 struct slot *p_slot; 63 u32 event_type; 64 65 /* Attention Button Change */ 66 dbg("pciehp: Attention button interrupt received.\n"); 67 68 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); 69 70 /* 71 * Button pressed - See if need to TAKE ACTION!!! 72 */ 73 info("Button pressed on Slot(%s)\n", p_slot->name); 74 event_type = INT_BUTTON_PRESS; 75 76 queue_interrupt_event(p_slot, event_type); 77 78 return 0; 79} 80 81u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl) 82{ 83 struct slot *p_slot; 84 u8 getstatus; 85 u32 event_type; 86 87 /* Switch Change */ 88 dbg("pciehp: Switch interrupt received.\n"); 89 90 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); 91 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); 92 93 if (getstatus) { 94 /* 95 * Switch opened 96 */ 97 info("Latch open on Slot(%s)\n", p_slot->name); 98 event_type = INT_SWITCH_OPEN; 99 } else { 100 /* 101 * Switch closed 102 */ 103 info("Latch close on Slot(%s)\n", p_slot->name); 104 event_type = INT_SWITCH_CLOSE; 105 } 106 107 queue_interrupt_event(p_slot, event_type); 108 109 return 1; 110} 111 112u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl) 113{ 114 struct slot *p_slot; 115 u32 event_type; 116 u8 presence_save; 117 118 /* Presence Change */ 119 dbg("pciehp: Presence/Notify input change.\n"); 120 121 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); 122 123 /* Switch is open, assume a presence change 124 * Save the presence state 125 */ 126 p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save); 127 if (presence_save) { 128 /* 129 * Card Present 130 */ 131 info("Card present on Slot(%s)\n", p_slot->name); 132 event_type = INT_PRESENCE_ON; 133 } else { 134 /* 135 * Not Present 136 */ 137 info("Card not present on Slot(%s)\n", p_slot->name); 138 event_type = INT_PRESENCE_OFF; 139 } 140 141 queue_interrupt_event(p_slot, event_type); 142 143 return 1; 144} 145 146u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl) 147{ 148 struct slot *p_slot; 149 u32 event_type; 150 151 /* power fault */ 152 dbg("pciehp: Power fault interrupt received.\n"); 153 154 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); 155 156 if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) { 157 /* 158 * power fault Cleared 159 */ 160 info("Power fault cleared on Slot(%s)\n", p_slot->name); 161 event_type = INT_POWER_FAULT_CLEAR; 162 } else { 163 /* 164 * power fault 165 */ 166 info("Power fault on Slot(%s)\n", p_slot->name); 167 event_type = INT_POWER_FAULT; 168 info("power fault bit %x set\n", hp_slot); 169 } 170 171 queue_interrupt_event(p_slot, event_type); 172 173 return 1; 174} 175 176/* The following routines constitute the bulk of the 177 hotplug controller logic 178 */ 179 180static void set_slot_off(struct controller *ctrl, struct slot * pslot) 181{ 182 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/ 183 if (POWER_CTRL(ctrl->ctrlcap)) { 184 if (pslot->hpc_ops->power_off_slot(pslot)) { 185 err("%s: Issue of Slot Power Off command failed\n", 186 __FUNCTION__); 187 return; 188 } 189 } 190 191 if (PWR_LED(ctrl->ctrlcap)) 192 pslot->hpc_ops->green_led_off(pslot); 193 194 if (ATTN_LED(ctrl->ctrlcap)) { 195 if (pslot->hpc_ops->set_attention_status(pslot, 1)) { 196 err("%s: Issue of Set Attention Led command failed\n", 197 __FUNCTION__); 198 return; 199 } 200 } 201} 202 203/** 204 * board_added - Called after a board has been added to the system. 205 * 206 * Turns power on for the board 207 * Configures board 208 * 209 */ 210static int board_added(struct slot *p_slot) 211{ 212 u8 hp_slot; 213 int retval = 0; 214 struct controller *ctrl = p_slot->ctrl; 215 216 hp_slot = p_slot->device - ctrl->slot_device_offset; 217 218 dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n", 219 __FUNCTION__, p_slot->device, 220 ctrl->slot_device_offset, hp_slot); 221 222 if (POWER_CTRL(ctrl->ctrlcap)) { 223 /* Power on slot */ 224 retval = p_slot->hpc_ops->power_on_slot(p_slot); 225 if (retval) 226 return retval; 227 } 228 229 if (PWR_LED(ctrl->ctrlcap)) 230 p_slot->hpc_ops->green_led_blink(p_slot); 231 232 /* Wait for ~1 second */ 233 msleep(1000); 234 235 /* Check link training status */ 236 retval = p_slot->hpc_ops->check_lnk_status(ctrl); 237 if (retval) { 238 err("%s: Failed to check link status\n", __FUNCTION__); 239 set_slot_off(ctrl, p_slot); 240 return retval; 241 } 242 243 /* Check for a power fault */ 244 if (p_slot->hpc_ops->query_power_fault(p_slot)) { 245 dbg("%s: power fault detected\n", __FUNCTION__); 246 retval = POWER_FAILURE; 247 goto err_exit; 248 } 249 250 retval = pciehp_configure_device(p_slot); 251 if (retval) { 252 err("Cannot add device 0x%x:%x\n", p_slot->bus, 253 p_slot->device); 254 goto err_exit; 255 } 256 257 /* 258 * Some PCI Express root ports require fixup after hot-plug operation. 259 */ 260 if (pcie_mch_quirk) 261 pci_fixup_device(pci_fixup_final, ctrl->pci_dev); 262 if (PWR_LED(ctrl->ctrlcap)) 263 p_slot->hpc_ops->green_led_on(p_slot); 264 265 return 0; 266 267err_exit: 268 set_slot_off(ctrl, p_slot); 269 return retval; 270} 271 272/** 273 * remove_board - Turns off slot and LED's 274 * 275 */ 276static int remove_board(struct slot *p_slot) 277{ 278 u8 device; 279 u8 hp_slot; 280 int retval = 0; 281 struct controller *ctrl = p_slot->ctrl; 282 283 retval = pciehp_unconfigure_device(p_slot); 284 if (retval) 285 return retval; 286 287 device = p_slot->device; 288 hp_slot = p_slot->device - ctrl->slot_device_offset; 289 p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); 290 291 dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot); 292 293 if (POWER_CTRL(ctrl->ctrlcap)) { 294 /* power off slot */ 295 retval = p_slot->hpc_ops->power_off_slot(p_slot); 296 if (retval) { 297 err("%s: Issue of Slot Disable command failed\n", 298 __FUNCTION__); 299 return retval; 300 } 301 } 302 303 if (PWR_LED(ctrl->ctrlcap)) 304 /* turn off Green LED */ 305 p_slot->hpc_ops->green_led_off(p_slot); 306 307 return 0; 308} 309 310struct power_work_info { 311 struct slot *p_slot; 312 struct work_struct work; 313}; 314 315/** 316 * pciehp_pushbutton_thread 317 * 318 * Scheduled procedure to handle blocking stuff for the pushbuttons 319 * Handles all pending events and exits. 320 * 321 */ 322static void pciehp_power_thread(struct work_struct *work) 323{ 324 struct power_work_info *info = 325 container_of(work, struct power_work_info, work); 326 struct slot *p_slot = info->p_slot; 327 328 mutex_lock(&p_slot->lock); 329 switch (p_slot->state) { 330 case POWEROFF_STATE: 331 mutex_unlock(&p_slot->lock); 332 dbg("%s: disabling bus:device(%x:%x)\n", 333 __FUNCTION__, p_slot->bus, p_slot->device); 334 pciehp_disable_slot(p_slot); 335 mutex_lock(&p_slot->lock); 336 p_slot->state = STATIC_STATE; 337 break; 338 case POWERON_STATE: 339 mutex_unlock(&p_slot->lock); 340 if (pciehp_enable_slot(p_slot) && 341 PWR_LED(p_slot->ctrl->ctrlcap)) 342 p_slot->hpc_ops->green_led_off(p_slot); 343 mutex_lock(&p_slot->lock); 344 p_slot->state = STATIC_STATE; 345 break; 346 default: 347 break; 348 } 349 mutex_unlock(&p_slot->lock); 350 351 kfree(info); 352} 353 354void pciehp_queue_pushbutton_work(struct work_struct *work) 355{ 356 struct slot *p_slot = container_of(work, struct slot, work.work); 357 struct power_work_info *info; 358 359 info = kmalloc(sizeof(*info), GFP_KERNEL); 360 if (!info) { 361 err("%s: Cannot allocate memory\n", __FUNCTION__); 362 return; 363 } 364 info->p_slot = p_slot; 365 INIT_WORK(&info->work, pciehp_power_thread); 366 367 mutex_lock(&p_slot->lock); 368 switch (p_slot->state) { 369 case BLINKINGOFF_STATE: 370 p_slot->state = POWEROFF_STATE; 371 break; 372 case BLINKINGON_STATE: 373 p_slot->state = POWERON_STATE; 374 break; 375 default: 376 goto out; 377 } 378 queue_work(pciehp_wq, &info->work); 379 out: 380 mutex_unlock(&p_slot->lock); 381} 382 383static int update_slot_info(struct slot *slot) 384{ 385 struct hotplug_slot_info *info; 386 int result; 387 388 info = kmalloc(sizeof(*info), GFP_KERNEL); 389 if (!info) 390 return -ENOMEM; 391 392 slot->hpc_ops->get_power_status(slot, &(info->power_status)); 393 slot->hpc_ops->get_attention_status(slot, &(info->attention_status)); 394 slot->hpc_ops->get_latch_status(slot, &(info->latch_status)); 395 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status)); 396 397 result = pci_hp_change_slot_info(slot->hotplug_slot, info); 398 kfree (info); 399 return result; 400} 401 402/* 403 * Note: This function must be called with slot->lock held 404 */ 405static void handle_button_press_event(struct slot *p_slot) 406{ 407 struct controller *ctrl = p_slot->ctrl; 408 u8 getstatus; 409 410 switch (p_slot->state) { 411 case STATIC_STATE: 412 p_slot->hpc_ops->get_power_status(p_slot, &getstatus); 413 if (getstatus) { 414 p_slot->state = BLINKINGOFF_STATE; 415 info("PCI slot #%s - powering off due to button " 416 "press.\n", p_slot->name); 417 } else { 418 p_slot->state = BLINKINGON_STATE; 419 info("PCI slot #%s - powering on due to button " 420 "press.\n", p_slot->name); 421 } 422 /* blink green LED and turn off amber */ 423 if (PWR_LED(ctrl->ctrlcap)) 424 p_slot->hpc_ops->green_led_blink(p_slot); 425 if (ATTN_LED(ctrl->ctrlcap)) 426 p_slot->hpc_ops->set_attention_status(p_slot, 0); 427 428 schedule_delayed_work(&p_slot->work, 5*HZ); 429 break; 430 case BLINKINGOFF_STATE: 431 case BLINKINGON_STATE: 432 /* 433 * Cancel if we are still blinking; this means that we 434 * press the attention again before the 5 sec. limit 435 * expires to cancel hot-add or hot-remove 436 */ 437 info("Button cancel on Slot(%s)\n", p_slot->name); 438 dbg("%s: button cancel\n", __FUNCTION__); 439 cancel_delayed_work(&p_slot->work); 440 if (p_slot->state == BLINKINGOFF_STATE) { 441 if (PWR_LED(ctrl->ctrlcap)) 442 p_slot->hpc_ops->green_led_on(p_slot); 443 } else { 444 if (PWR_LED(ctrl->ctrlcap)) 445 p_slot->hpc_ops->green_led_off(p_slot); 446 } 447 if (ATTN_LED(ctrl->ctrlcap)) 448 p_slot->hpc_ops->set_attention_status(p_slot, 0); 449 info("PCI slot #%s - action canceled due to button press\n", 450 p_slot->name); 451 p_slot->state = STATIC_STATE; 452 break; 453 case POWEROFF_STATE: 454 case POWERON_STATE: 455 /* 456 * Ignore if the slot is on power-on or power-off state; 457 * this means that the previous attention button action 458 * to hot-add or hot-remove is undergoing 459 */ 460 info("Button ignore on Slot(%s)\n", p_slot->name); 461 update_slot_info(p_slot); 462 break; 463 default: 464 warn("Not a valid state\n"); 465 break; 466 } 467} 468 469/* 470 * Note: This function must be called with slot->lock held 471 */ 472static void handle_surprise_event(struct slot *p_slot) 473{ 474 u8 getstatus; 475 struct power_work_info *info; 476 477 info = kmalloc(sizeof(*info), GFP_KERNEL); 478 if (!info) { 479 err("%s: Cannot allocate memory\n", __FUNCTION__); 480 return; 481 } 482 info->p_slot = p_slot; 483 INIT_WORK(&info->work, pciehp_power_thread); 484 485 p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); 486 if (!getstatus) 487 p_slot->state = POWEROFF_STATE; 488 else 489 p_slot->state = POWERON_STATE; 490 491 queue_work(pciehp_wq, &info->work); 492} 493 494static void interrupt_event_handler(struct work_struct *work) 495{ 496 struct event_info *info = container_of(work, struct event_info, work); 497 struct slot *p_slot = info->p_slot; 498 struct controller *ctrl = p_slot->ctrl; 499 500 mutex_lock(&p_slot->lock); 501 switch (info->event_type) { 502 case INT_BUTTON_PRESS: 503 handle_button_press_event(p_slot); 504 break; 505 case INT_POWER_FAULT: 506 if (!POWER_CTRL(ctrl->ctrlcap)) 507 break; 508 if (ATTN_LED(ctrl->ctrlcap)) 509 p_slot->hpc_ops->set_attention_status(p_slot, 1); 510 if (PWR_LED(ctrl->ctrlcap)) 511 p_slot->hpc_ops->green_led_off(p_slot); 512 break; 513 case INT_PRESENCE_ON: 514 case INT_PRESENCE_OFF: 515 if (!HP_SUPR_RM(ctrl->ctrlcap)) 516 break; 517 dbg("Surprise Removal\n"); 518 update_slot_info(p_slot); 519 handle_surprise_event(p_slot); 520 break; 521 default: 522 update_slot_info(p_slot); 523 break; 524 } 525 mutex_unlock(&p_slot->lock); 526 527 kfree(info); 528} 529 530int pciehp_enable_slot(struct slot *p_slot) 531{ 532 u8 getstatus = 0; 533 int rc; 534 535 /* Check to see if (latch closed, card present, power off) */ 536 mutex_lock(&p_slot->ctrl->crit_sect); 537 538 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); 539 if (rc || !getstatus) { 540 info("%s: no adapter on slot(%s)\n", __FUNCTION__, 541 p_slot->name); 542 mutex_unlock(&p_slot->ctrl->crit_sect); 543 return -ENODEV; 544 } 545 if (MRL_SENS(p_slot->ctrl->ctrlcap)) { 546 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); 547 if (rc || getstatus) { 548 info("%s: latch open on slot(%s)\n", __FUNCTION__, 549 p_slot->name); 550 mutex_unlock(&p_slot->ctrl->crit_sect); 551 return -ENODEV; 552 } 553 } 554 555 if (POWER_CTRL(p_slot->ctrl->ctrlcap)) { 556 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); 557 if (rc || getstatus) { 558 info("%s: already enabled on slot(%s)\n", __FUNCTION__, 559 p_slot->name); 560 mutex_unlock(&p_slot->ctrl->crit_sect); 561 return -EINVAL; 562 } 563 } 564 565 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); 566 567 rc = board_added(p_slot); 568 if (rc) { 569 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); 570 } 571 572 update_slot_info(p_slot); 573 574 mutex_unlock(&p_slot->ctrl->crit_sect); 575 return rc; 576} 577 578 579int pciehp_disable_slot(struct slot *p_slot) 580{ 581 u8 getstatus = 0; 582 int ret = 0; 583 584 if (!p_slot->ctrl) 585 return 1; 586 587 /* Check to see if (latch closed, card present, power on) */ 588 mutex_lock(&p_slot->ctrl->crit_sect); 589 590 if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) { 591 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); 592 if (ret || !getstatus) { 593 info("%s: no adapter on slot(%s)\n", __FUNCTION__, 594 p_slot->name); 595 mutex_unlock(&p_slot->ctrl->crit_sect); 596 return -ENODEV; 597 } 598 } 599 600 if (MRL_SENS(p_slot->ctrl->ctrlcap)) { 601 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); 602 if (ret || getstatus) { 603 info("%s: latch open on slot(%s)\n", __FUNCTION__, 604 p_slot->name); 605 mutex_unlock(&p_slot->ctrl->crit_sect); 606 return -ENODEV; 607 } 608 } 609 610 if (POWER_CTRL(p_slot->ctrl->ctrlcap)) { 611 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); 612 if (ret || !getstatus) { 613 info("%s: already disabled slot(%s)\n", __FUNCTION__, 614 p_slot->name); 615 mutex_unlock(&p_slot->ctrl->crit_sect); 616 return -EINVAL; 617 } 618 } 619 620 ret = remove_board(p_slot); 621 update_slot_info(p_slot); 622 623 mutex_unlock(&p_slot->ctrl->crit_sect); 624 return ret; 625} 626 627int pciehp_sysfs_enable_slot(struct slot *p_slot) 628{ 629 int retval = -ENODEV; 630 631 mutex_lock(&p_slot->lock); 632 switch (p_slot->state) { 633 case BLINKINGON_STATE: 634 cancel_delayed_work(&p_slot->work); 635 case STATIC_STATE: 636 p_slot->state = POWERON_STATE; 637 mutex_unlock(&p_slot->lock); 638 retval = pciehp_enable_slot(p_slot); 639 mutex_lock(&p_slot->lock); 640 p_slot->state = STATIC_STATE; 641 break; 642 case POWERON_STATE: 643 info("Slot %s is already in powering on state\n", 644 p_slot->name); 645 break; 646 case BLINKINGOFF_STATE: 647 case POWEROFF_STATE: 648 info("Already enabled on slot %s\n", p_slot->name); 649 break; 650 default: 651 err("Not a valid state on slot %s\n", p_slot->name); 652 break; 653 } 654 mutex_unlock(&p_slot->lock); 655 656 return retval; 657} 658 659int pciehp_sysfs_disable_slot(struct slot *p_slot) 660{ 661 int retval = -ENODEV; 662 663 mutex_lock(&p_slot->lock); 664 switch (p_slot->state) { 665 case BLINKINGOFF_STATE: 666 cancel_delayed_work(&p_slot->work); 667 case STATIC_STATE: 668 p_slot->state = POWEROFF_STATE; 669 mutex_unlock(&p_slot->lock); 670 retval = pciehp_disable_slot(p_slot); 671 mutex_lock(&p_slot->lock); 672 p_slot->state = STATIC_STATE; 673 break; 674 case POWEROFF_STATE: 675 info("Slot %s is already in powering off state\n", 676 p_slot->name); 677 break; 678 case BLINKINGON_STATE: 679 case POWERON_STATE: 680 info("Already disabled on slot %s\n", p_slot->name); 681 break; 682 default: 683 err("Not a valid state on slot %s\n", p_slot->name); 684 break; 685 } 686 mutex_unlock(&p_slot->lock); 687 688 return retval; 689} 690