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 goto out; 345 } 346 queue_work(pciehp_wq, &info->work); 347 out: 348 mutex_unlock(&p_slot->lock); 349 } 350 351 /* 352 * Note: This function must be called with slot->lock held 353 */ 354 static void handle_button_press_event(struct slot *p_slot) 355 { 356 struct controller *ctrl = p_slot->ctrl; 357 u8 getstatus; 358 359 switch (p_slot->state) { 360 case STATIC_STATE: 361 pciehp_get_power_status(p_slot, &getstatus); 362 if (getstatus) { 363 p_slot->state = BLINKINGOFF_STATE; 364 ctrl_info(ctrl, 365 "PCI slot #%s - powering off due to button " 366 "press.\n", slot_name(p_slot)); 367 } else { 368 p_slot->state = BLINKINGON_STATE; 369 ctrl_info(ctrl, 370 "PCI slot #%s - powering on due to button " 371 "press.\n", slot_name(p_slot)); 372 } 373 /* blink green LED and turn off amber */ 374 if (PWR_LED(ctrl)) 375 pciehp_green_led_blink(p_slot); 376 if (ATTN_LED(ctrl)) 377 pciehp_set_attention_status(p_slot, 0); 378 379 schedule_delayed_work(&p_slot->work, 5*HZ); 380 break; 381 case BLINKINGOFF_STATE: 382 case BLINKINGON_STATE: 383 /* 384 * Cancel if we are still blinking; this means that we 385 * press the attention again before the 5 sec. limit 386 * expires to cancel hot-add or hot-remove 387 */ 388 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot)); 389 cancel_delayed_work(&p_slot->work); 390 if (p_slot->state == BLINKINGOFF_STATE) { 391 if (PWR_LED(ctrl)) 392 pciehp_green_led_on(p_slot); 393 } else { 394 if (PWR_LED(ctrl)) 395 pciehp_green_led_off(p_slot); 396 } 397 if (ATTN_LED(ctrl)) 398 pciehp_set_attention_status(p_slot, 0); 399 ctrl_info(ctrl, "PCI slot #%s - action canceled " 400 "due to button press\n", slot_name(p_slot)); 401 p_slot->state = STATIC_STATE; 402 break; 403 case POWEROFF_STATE: 404 case POWERON_STATE: 405 /* 406 * Ignore if the slot is on power-on or power-off state; 407 * this means that the previous attention button action 408 * to hot-add or hot-remove is undergoing 409 */ 410 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot)); 411 break; 412 default: 413 ctrl_warn(ctrl, "Not a valid state\n"); 414 break; 415 } 416 } 417 418 /* 419 * Note: This function must be called with slot->lock held 420 */ 421 static void handle_surprise_event(struct slot *p_slot) 422 { 423 u8 getstatus; 424 struct power_work_info *info; 425 426 info = kmalloc(sizeof(*info), GFP_KERNEL); 427 if (!info) { 428 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n", 429 __func__); 430 return; 431 } 432 info->p_slot = p_slot; 433 INIT_WORK(&info->work, pciehp_power_thread); 434 435 pciehp_get_adapter_status(p_slot, &getstatus); 436 if (!getstatus) 437 p_slot->state = POWEROFF_STATE; 438 else 439 p_slot->state = POWERON_STATE; 440 441 queue_work(pciehp_wq, &info->work); 442 } 443 444 static void interrupt_event_handler(struct work_struct *work) 445 { 446 struct event_info *info = container_of(work, struct event_info, work); 447 struct slot *p_slot = info->p_slot; 448 struct controller *ctrl = p_slot->ctrl; 449 450 mutex_lock(&p_slot->lock); 451 switch (info->event_type) { 452 case INT_BUTTON_PRESS: 453 handle_button_press_event(p_slot); 454 break; 455 case INT_POWER_FAULT: 456 if (!POWER_CTRL(ctrl)) 457 break; 458 if (ATTN_LED(ctrl)) 459 pciehp_set_attention_status(p_slot, 1); 460 if (PWR_LED(ctrl)) 461 pciehp_green_led_off(p_slot); 462 break; 463 case INT_PRESENCE_ON: 464 case INT_PRESENCE_OFF: 465 if (!HP_SUPR_RM(ctrl)) 466 break; 467 ctrl_dbg(ctrl, "Surprise Removal\n"); 468 handle_surprise_event(p_slot); 469 break; 470 default: 471 break; 472 } 473 mutex_unlock(&p_slot->lock); 474 475 kfree(info); 476 } 477 478 int pciehp_enable_slot(struct slot *p_slot) 479 { 480 u8 getstatus = 0; 481 int rc; 482 struct controller *ctrl = p_slot->ctrl; 483 484 rc = pciehp_get_adapter_status(p_slot, &getstatus); 485 if (rc || !getstatus) { 486 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot)); 487 return -ENODEV; 488 } 489 if (MRL_SENS(p_slot->ctrl)) { 490 rc = pciehp_get_latch_status(p_slot, &getstatus); 491 if (rc || getstatus) { 492 ctrl_info(ctrl, "Latch open on slot(%s)\n", 493 slot_name(p_slot)); 494 return -ENODEV; 495 } 496 } 497 498 if (POWER_CTRL(p_slot->ctrl)) { 499 rc = pciehp_get_power_status(p_slot, &getstatus); 500 if (rc || getstatus) { 501 ctrl_info(ctrl, "Already enabled on slot(%s)\n", 502 slot_name(p_slot)); 503 return -EINVAL; 504 } 505 } 506 507 pciehp_get_latch_status(p_slot, &getstatus); 508 509 rc = board_added(p_slot); 510 if (rc) { 511 pciehp_get_latch_status(p_slot, &getstatus); 512 } 513 return rc; 514 } 515 516 517 int pciehp_disable_slot(struct slot *p_slot) 518 { 519 u8 getstatus = 0; 520 int ret = 0; 521 struct controller *ctrl = p_slot->ctrl; 522 523 if (!p_slot->ctrl) 524 return 1; 525 526 if (!HP_SUPR_RM(p_slot->ctrl)) { 527 ret = pciehp_get_adapter_status(p_slot, &getstatus); 528 if (ret || !getstatus) { 529 ctrl_info(ctrl, "No adapter on slot(%s)\n", 530 slot_name(p_slot)); 531 return -ENODEV; 532 } 533 } 534 535 if (MRL_SENS(p_slot->ctrl)) { 536 ret = pciehp_get_latch_status(p_slot, &getstatus); 537 if (ret || getstatus) { 538 ctrl_info(ctrl, "Latch open on slot(%s)\n", 539 slot_name(p_slot)); 540 return -ENODEV; 541 } 542 } 543 544 if (POWER_CTRL(p_slot->ctrl)) { 545 ret = pciehp_get_power_status(p_slot, &getstatus); 546 if (ret || !getstatus) { 547 ctrl_info(ctrl, "Already disabled on slot(%s)\n", 548 slot_name(p_slot)); 549 return -EINVAL; 550 } 551 } 552 553 return remove_board(p_slot); 554 } 555 556 int pciehp_sysfs_enable_slot(struct slot *p_slot) 557 { 558 int retval = -ENODEV; 559 struct controller *ctrl = p_slot->ctrl; 560 561 mutex_lock(&p_slot->lock); 562 switch (p_slot->state) { 563 case BLINKINGON_STATE: 564 cancel_delayed_work(&p_slot->work); 565 case STATIC_STATE: 566 p_slot->state = POWERON_STATE; 567 mutex_unlock(&p_slot->lock); 568 retval = pciehp_enable_slot(p_slot); 569 mutex_lock(&p_slot->lock); 570 p_slot->state = STATIC_STATE; 571 break; 572 case POWERON_STATE: 573 ctrl_info(ctrl, "Slot %s is already in powering on state\n", 574 slot_name(p_slot)); 575 break; 576 case BLINKINGOFF_STATE: 577 case POWEROFF_STATE: 578 ctrl_info(ctrl, "Already enabled on slot %s\n", 579 slot_name(p_slot)); 580 break; 581 default: 582 ctrl_err(ctrl, "Not a valid state on slot %s\n", 583 slot_name(p_slot)); 584 break; 585 } 586 mutex_unlock(&p_slot->lock); 587 588 return retval; 589 } 590 591 int pciehp_sysfs_disable_slot(struct slot *p_slot) 592 { 593 int retval = -ENODEV; 594 struct controller *ctrl = p_slot->ctrl; 595 596 mutex_lock(&p_slot->lock); 597 switch (p_slot->state) { 598 case BLINKINGOFF_STATE: 599 cancel_delayed_work(&p_slot->work); 600 case STATIC_STATE: 601 p_slot->state = POWEROFF_STATE; 602 mutex_unlock(&p_slot->lock); 603 retval = pciehp_disable_slot(p_slot); 604 mutex_lock(&p_slot->lock); 605 p_slot->state = STATIC_STATE; 606 break; 607 case POWEROFF_STATE: 608 ctrl_info(ctrl, "Slot %s is already in powering off state\n", 609 slot_name(p_slot)); 610 break; 611 case BLINKINGON_STATE: 612 case POWERON_STATE: 613 ctrl_info(ctrl, "Already disabled on slot %s\n", 614 slot_name(p_slot)); 615 break; 616 default: 617 ctrl_err(ctrl, "Not a valid state on slot %s\n", 618 slot_name(p_slot)); 619 break; 620 } 621 mutex_unlock(&p_slot->lock); 622 623 return retval; 624 } 625