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(p_slot->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 /* 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(p_slot->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 queue_delayed_work(p_slot->wq, &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(p_slot->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 } 626