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 } 629