1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * IBM Hot Plug Controller Driver 4 * 5 * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation 6 * 7 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com) 8 * Copyright (C) 2001-2003 IBM Corp. 9 * 10 * All rights reserved. 11 * 12 * Send feedback to <gregkh@us.ibm.com> 13 * 14 */ 15 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/slab.h> 19 #include <linux/pci.h> 20 #include <linux/interrupt.h> 21 #include <linux/delay.h> 22 #include <linux/wait.h> 23 #include "../pci.h" 24 #include <asm/pci_x86.h> /* for struct irq_routing_table */ 25 #include <asm/io_apic.h> 26 #include "ibmphp.h" 27 28 #define attn_on(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNON) 29 #define attn_off(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNOFF) 30 #define attn_LED_blink(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_BLINKLED) 31 #define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot(sl, READ_REVLEVEL, rev) 32 #define get_hpc_options(sl, opt) ibmphp_hpc_readslot(sl, READ_HPCOPTIONS, opt) 33 34 #define DRIVER_VERSION "0.6" 35 #define DRIVER_DESC "IBM Hot Plug PCI Controller Driver" 36 37 int ibmphp_debug; 38 39 static bool debug; 40 module_param(debug, bool, S_IRUGO | S_IWUSR); 41 MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); 42 MODULE_LICENSE("GPL"); 43 MODULE_DESCRIPTION(DRIVER_DESC); 44 45 struct pci_bus *ibmphp_pci_bus; 46 static int max_slots; 47 48 static int irqs[16]; /* PIC mode IRQs we're using so far (in case MPS 49 * tables don't provide default info for empty slots */ 50 51 static int init_flag; 52 53 /* 54 static int get_max_adapter_speed_1 (struct hotplug_slot *, u8 *, u8); 55 56 static inline int get_max_adapter_speed (struct hotplug_slot *hs, u8 *value) 57 { 58 return get_max_adapter_speed_1 (hs, value, 1); 59 } 60 */ 61 static inline int get_cur_bus_info(struct slot **sl) 62 { 63 int rc = 1; 64 struct slot *slot_cur = *sl; 65 66 debug("options = %x\n", slot_cur->ctrl->options); 67 debug("revision = %x\n", slot_cur->ctrl->revision); 68 69 if (READ_BUS_STATUS(slot_cur->ctrl)) 70 rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL); 71 72 if (rc) 73 return rc; 74 75 slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus); 76 if (READ_BUS_MODE(slot_cur->ctrl)) 77 slot_cur->bus_on->current_bus_mode = 78 CURRENT_BUS_MODE(slot_cur->busstatus); 79 else 80 slot_cur->bus_on->current_bus_mode = 0xFF; 81 82 debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n", 83 slot_cur->busstatus, 84 slot_cur->bus_on->current_speed, 85 slot_cur->bus_on->current_bus_mode); 86 87 *sl = slot_cur; 88 return 0; 89 } 90 91 static inline int slot_update(struct slot **sl) 92 { 93 int rc; 94 rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL); 95 if (rc) 96 return rc; 97 if (!init_flag) 98 rc = get_cur_bus_info(sl); 99 return rc; 100 } 101 102 static int __init get_max_slots(void) 103 { 104 struct slot *slot_cur; 105 u8 slot_count = 0; 106 107 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) { 108 /* sometimes the hot-pluggable slots start with 4 (not always from 1) */ 109 slot_count = max(slot_count, slot_cur->number); 110 } 111 return slot_count; 112 } 113 114 /* This routine will put the correct slot->device information per slot. It's 115 * called from initialization of the slot structures. It will also assign 116 * interrupt numbers per each slot. 117 * Parameters: struct slot 118 * Returns 0 or errors 119 */ 120 int ibmphp_init_devno(struct slot **cur_slot) 121 { 122 struct irq_routing_table *rtable; 123 int len; 124 int loop; 125 int i; 126 127 rtable = pcibios_get_irq_routing_table(); 128 if (!rtable) { 129 err("no BIOS routing table...\n"); 130 return -ENOMEM; 131 } 132 133 len = (rtable->size - sizeof(struct irq_routing_table)) / 134 sizeof(struct irq_info); 135 136 if (!len) { 137 kfree(rtable); 138 return -1; 139 } 140 for (loop = 0; loop < len; loop++) { 141 if ((*cur_slot)->number == rtable->slots[loop].slot && 142 (*cur_slot)->bus == rtable->slots[loop].bus) { 143 (*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn); 144 for (i = 0; i < 4; i++) 145 (*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus, 146 (int) (*cur_slot)->device, i); 147 148 debug("(*cur_slot)->irq[0] = %x\n", 149 (*cur_slot)->irq[0]); 150 debug("(*cur_slot)->irq[1] = %x\n", 151 (*cur_slot)->irq[1]); 152 debug("(*cur_slot)->irq[2] = %x\n", 153 (*cur_slot)->irq[2]); 154 debug("(*cur_slot)->irq[3] = %x\n", 155 (*cur_slot)->irq[3]); 156 157 debug("rtable->exclusive_irqs = %x\n", 158 rtable->exclusive_irqs); 159 debug("rtable->slots[loop].irq[0].bitmap = %x\n", 160 rtable->slots[loop].irq[0].bitmap); 161 debug("rtable->slots[loop].irq[1].bitmap = %x\n", 162 rtable->slots[loop].irq[1].bitmap); 163 debug("rtable->slots[loop].irq[2].bitmap = %x\n", 164 rtable->slots[loop].irq[2].bitmap); 165 debug("rtable->slots[loop].irq[3].bitmap = %x\n", 166 rtable->slots[loop].irq[3].bitmap); 167 168 debug("rtable->slots[loop].irq[0].link = %x\n", 169 rtable->slots[loop].irq[0].link); 170 debug("rtable->slots[loop].irq[1].link = %x\n", 171 rtable->slots[loop].irq[1].link); 172 debug("rtable->slots[loop].irq[2].link = %x\n", 173 rtable->slots[loop].irq[2].link); 174 debug("rtable->slots[loop].irq[3].link = %x\n", 175 rtable->slots[loop].irq[3].link); 176 debug("end of init_devno\n"); 177 kfree(rtable); 178 return 0; 179 } 180 } 181 182 kfree(rtable); 183 return -1; 184 } 185 186 static inline int power_on(struct slot *slot_cur) 187 { 188 u8 cmd = HPC_SLOT_ON; 189 int retval; 190 191 retval = ibmphp_hpc_writeslot(slot_cur, cmd); 192 if (retval) { 193 err("power on failed\n"); 194 return retval; 195 } 196 if (CTLR_RESULT(slot_cur->ctrl->status)) { 197 err("command not completed successfully in power_on\n"); 198 return -EIO; 199 } 200 msleep(3000); /* For ServeRAID cards, and some 66 PCI */ 201 return 0; 202 } 203 204 static inline int power_off(struct slot *slot_cur) 205 { 206 u8 cmd = HPC_SLOT_OFF; 207 int retval; 208 209 retval = ibmphp_hpc_writeslot(slot_cur, cmd); 210 if (retval) { 211 err("power off failed\n"); 212 return retval; 213 } 214 if (CTLR_RESULT(slot_cur->ctrl->status)) { 215 err("command not completed successfully in power_off\n"); 216 retval = -EIO; 217 } 218 return retval; 219 } 220 221 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) 222 { 223 int rc = 0; 224 struct slot *pslot; 225 u8 cmd = 0x00; /* avoid compiler warning */ 226 227 debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n", 228 (ulong) hotplug_slot, value); 229 ibmphp_lock_operations(); 230 231 232 if (hotplug_slot) { 233 switch (value) { 234 case HPC_SLOT_ATTN_OFF: 235 cmd = HPC_SLOT_ATTNOFF; 236 break; 237 case HPC_SLOT_ATTN_ON: 238 cmd = HPC_SLOT_ATTNON; 239 break; 240 case HPC_SLOT_ATTN_BLINK: 241 cmd = HPC_SLOT_BLINKLED; 242 break; 243 default: 244 rc = -ENODEV; 245 err("set_attention_status - Error : invalid input [%x]\n", 246 value); 247 break; 248 } 249 if (rc == 0) { 250 pslot = hotplug_slot->private; 251 if (pslot) 252 rc = ibmphp_hpc_writeslot(pslot, cmd); 253 else 254 rc = -ENODEV; 255 } 256 } else 257 rc = -ENODEV; 258 259 ibmphp_unlock_operations(); 260 261 debug("set_attention_status - Exit rc[%d]\n", rc); 262 return rc; 263 } 264 265 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 266 { 267 int rc = -ENODEV; 268 struct slot *pslot; 269 struct slot myslot; 270 271 debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 272 (ulong) hotplug_slot, (ulong) value); 273 274 ibmphp_lock_operations(); 275 if (hotplug_slot) { 276 pslot = hotplug_slot->private; 277 if (pslot) { 278 memcpy(&myslot, pslot, sizeof(struct slot)); 279 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 280 &(myslot.status)); 281 if (!rc) 282 rc = ibmphp_hpc_readslot(pslot, 283 READ_EXTSLOTSTATUS, 284 &(myslot.ext_status)); 285 if (!rc) 286 *value = SLOT_ATTN(myslot.status, 287 myslot.ext_status); 288 } 289 } 290 291 ibmphp_unlock_operations(); 292 debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value); 293 return rc; 294 } 295 296 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) 297 { 298 int rc = -ENODEV; 299 struct slot *pslot; 300 struct slot myslot; 301 302 debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 303 (ulong) hotplug_slot, (ulong) value); 304 ibmphp_lock_operations(); 305 if (hotplug_slot) { 306 pslot = hotplug_slot->private; 307 if (pslot) { 308 memcpy(&myslot, pslot, sizeof(struct slot)); 309 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 310 &(myslot.status)); 311 if (!rc) 312 *value = SLOT_LATCH(myslot.status); 313 } 314 } 315 316 ibmphp_unlock_operations(); 317 debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n", 318 rc, rc, *value); 319 return rc; 320 } 321 322 323 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 324 { 325 int rc = -ENODEV; 326 struct slot *pslot; 327 struct slot myslot; 328 329 debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 330 (ulong) hotplug_slot, (ulong) value); 331 ibmphp_lock_operations(); 332 if (hotplug_slot) { 333 pslot = hotplug_slot->private; 334 if (pslot) { 335 memcpy(&myslot, pslot, sizeof(struct slot)); 336 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 337 &(myslot.status)); 338 if (!rc) 339 *value = SLOT_PWRGD(myslot.status); 340 } 341 } 342 343 ibmphp_unlock_operations(); 344 debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n", 345 rc, rc, *value); 346 return rc; 347 } 348 349 static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value) 350 { 351 int rc = -ENODEV; 352 struct slot *pslot; 353 u8 present; 354 struct slot myslot; 355 356 debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 357 (ulong) hotplug_slot, (ulong) value); 358 ibmphp_lock_operations(); 359 if (hotplug_slot) { 360 pslot = hotplug_slot->private; 361 if (pslot) { 362 memcpy(&myslot, pslot, sizeof(struct slot)); 363 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 364 &(myslot.status)); 365 if (!rc) { 366 present = SLOT_PRESENT(myslot.status); 367 if (present == HPC_SLOT_EMPTY) 368 *value = 0; 369 else 370 *value = 1; 371 } 372 } 373 } 374 375 ibmphp_unlock_operations(); 376 debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value); 377 return rc; 378 } 379 380 static int get_max_bus_speed(struct slot *slot) 381 { 382 int rc = 0; 383 u8 mode = 0; 384 enum pci_bus_speed speed; 385 struct pci_bus *bus = slot->hotplug_slot->pci_slot->bus; 386 387 debug("%s - Entry slot[%p]\n", __func__, slot); 388 389 ibmphp_lock_operations(); 390 mode = slot->supported_bus_mode; 391 speed = slot->supported_speed; 392 ibmphp_unlock_operations(); 393 394 switch (speed) { 395 case BUS_SPEED_33: 396 break; 397 case BUS_SPEED_66: 398 if (mode == BUS_MODE_PCIX) 399 speed += 0x01; 400 break; 401 case BUS_SPEED_100: 402 case BUS_SPEED_133: 403 speed += 0x01; 404 break; 405 default: 406 /* Note (will need to change): there would be soon 256, 512 also */ 407 rc = -ENODEV; 408 } 409 410 if (!rc) 411 bus->max_bus_speed = speed; 412 413 debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed); 414 return rc; 415 } 416 417 /* 418 static int get_max_adapter_speed_1(struct hotplug_slot *hotplug_slot, u8 *value, u8 flag) 419 { 420 int rc = -ENODEV; 421 struct slot *pslot; 422 struct slot myslot; 423 424 debug("get_max_adapter_speed_1 - Entry hotplug_slot[%lx] pvalue[%lx]\n", 425 (ulong)hotplug_slot, (ulong) value); 426 427 if (flag) 428 ibmphp_lock_operations(); 429 430 if (hotplug_slot && value) { 431 pslot = hotplug_slot->private; 432 if (pslot) { 433 memcpy(&myslot, pslot, sizeof(struct slot)); 434 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 435 &(myslot.status)); 436 437 if (!(SLOT_LATCH (myslot.status)) && 438 (SLOT_PRESENT (myslot.status))) { 439 rc = ibmphp_hpc_readslot(pslot, 440 READ_EXTSLOTSTATUS, 441 &(myslot.ext_status)); 442 if (!rc) 443 *value = SLOT_SPEED(myslot.ext_status); 444 } else 445 *value = MAX_ADAPTER_NONE; 446 } 447 } 448 449 if (flag) 450 ibmphp_unlock_operations(); 451 452 debug("get_max_adapter_speed_1 - Exit rc[%d] value[%x]\n", rc, *value); 453 return rc; 454 } 455 456 static int get_bus_name(struct hotplug_slot *hotplug_slot, char *value) 457 { 458 int rc = -ENODEV; 459 struct slot *pslot = NULL; 460 461 debug("get_bus_name - Entry hotplug_slot[%lx]\n", (ulong)hotplug_slot); 462 463 ibmphp_lock_operations(); 464 465 if (hotplug_slot) { 466 pslot = hotplug_slot->private; 467 if (pslot) { 468 rc = 0; 469 snprintf(value, 100, "Bus %x", pslot->bus); 470 } 471 } else 472 rc = -ENODEV; 473 474 ibmphp_unlock_operations(); 475 debug("get_bus_name - Exit rc[%d] value[%x]\n", rc, *value); 476 return rc; 477 } 478 */ 479 480 /**************************************************************************** 481 * This routine will initialize the ops data structure used in the validate 482 * function. It will also power off empty slots that are powered on since BIOS 483 * leaves those on, albeit disconnected 484 ****************************************************************************/ 485 static int __init init_ops(void) 486 { 487 struct slot *slot_cur; 488 int retval; 489 int rc; 490 491 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) { 492 debug("BEFORE GETTING SLOT STATUS, slot # %x\n", 493 slot_cur->number); 494 if (slot_cur->ctrl->revision == 0xFF) 495 if (get_ctrl_revision(slot_cur, 496 &slot_cur->ctrl->revision)) 497 return -1; 498 499 if (slot_cur->bus_on->current_speed == 0xFF) 500 if (get_cur_bus_info(&slot_cur)) 501 return -1; 502 get_max_bus_speed(slot_cur); 503 504 if (slot_cur->ctrl->options == 0xFF) 505 if (get_hpc_options(slot_cur, &slot_cur->ctrl->options)) 506 return -1; 507 508 retval = slot_update(&slot_cur); 509 if (retval) 510 return retval; 511 512 debug("status = %x\n", slot_cur->status); 513 debug("ext_status = %x\n", slot_cur->ext_status); 514 debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status)); 515 debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status)); 516 debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status)); 517 518 if ((SLOT_PWRGD(slot_cur->status)) && 519 !(SLOT_PRESENT(slot_cur->status)) && 520 !(SLOT_LATCH(slot_cur->status))) { 521 debug("BEFORE POWER OFF COMMAND\n"); 522 rc = power_off(slot_cur); 523 if (rc) 524 return rc; 525 526 /* retval = slot_update(&slot_cur); 527 * if (retval) 528 * return retval; 529 * ibmphp_update_slot_info(slot_cur); 530 */ 531 } 532 } 533 init_flag = 0; 534 return 0; 535 } 536 537 /* This operation will check whether the slot is within the bounds and 538 * the operation is valid to perform on that slot 539 * Parameters: slot, operation 540 * Returns: 0 or error codes 541 */ 542 static int validate(struct slot *slot_cur, int opn) 543 { 544 int number; 545 int retval; 546 547 if (!slot_cur) 548 return -ENODEV; 549 number = slot_cur->number; 550 if ((number > max_slots) || (number < 0)) 551 return -EBADSLT; 552 debug("slot_number in validate is %d\n", slot_cur->number); 553 554 retval = slot_update(&slot_cur); 555 if (retval) 556 return retval; 557 558 switch (opn) { 559 case ENABLE: 560 if (!(SLOT_PWRGD(slot_cur->status)) && 561 (SLOT_PRESENT(slot_cur->status)) && 562 !(SLOT_LATCH(slot_cur->status))) 563 return 0; 564 break; 565 case DISABLE: 566 if ((SLOT_PWRGD(slot_cur->status)) && 567 (SLOT_PRESENT(slot_cur->status)) && 568 !(SLOT_LATCH(slot_cur->status))) 569 return 0; 570 break; 571 default: 572 break; 573 } 574 err("validate failed....\n"); 575 return -EINVAL; 576 } 577 578 /**************************************************************************** 579 * This routine is for updating the data structures in the hotplug core 580 * Parameters: struct slot 581 * Returns: 0 or error 582 ****************************************************************************/ 583 int ibmphp_update_slot_info(struct slot *slot_cur) 584 { 585 struct hotplug_slot_info *info; 586 struct pci_bus *bus = slot_cur->hotplug_slot->pci_slot->bus; 587 int rc; 588 u8 bus_speed; 589 u8 mode; 590 591 info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL); 592 if (!info) 593 return -ENOMEM; 594 595 info->power_status = SLOT_PWRGD(slot_cur->status); 596 info->attention_status = SLOT_ATTN(slot_cur->status, 597 slot_cur->ext_status); 598 info->latch_status = SLOT_LATCH(slot_cur->status); 599 if (!SLOT_PRESENT(slot_cur->status)) { 600 info->adapter_status = 0; 601 /* info->max_adapter_speed_status = MAX_ADAPTER_NONE; */ 602 } else { 603 info->adapter_status = 1; 604 /* get_max_adapter_speed_1(slot_cur->hotplug_slot, 605 &info->max_adapter_speed_status, 0); */ 606 } 607 608 bus_speed = slot_cur->bus_on->current_speed; 609 mode = slot_cur->bus_on->current_bus_mode; 610 611 switch (bus_speed) { 612 case BUS_SPEED_33: 613 break; 614 case BUS_SPEED_66: 615 if (mode == BUS_MODE_PCIX) 616 bus_speed += 0x01; 617 else if (mode == BUS_MODE_PCI) 618 ; 619 else 620 bus_speed = PCI_SPEED_UNKNOWN; 621 break; 622 case BUS_SPEED_100: 623 case BUS_SPEED_133: 624 bus_speed += 0x01; 625 break; 626 default: 627 bus_speed = PCI_SPEED_UNKNOWN; 628 } 629 630 bus->cur_bus_speed = bus_speed; 631 // To do: bus_names 632 633 rc = pci_hp_change_slot_info(slot_cur->hotplug_slot, info); 634 kfree(info); 635 return rc; 636 } 637 638 639 /****************************************************************************** 640 * This function will return the pci_func, given bus and devfunc, or NULL. It 641 * is called from visit routines 642 ******************************************************************************/ 643 644 static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function) 645 { 646 struct pci_func *func_cur; 647 struct slot *slot_cur; 648 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) { 649 if (slot_cur->func) { 650 func_cur = slot_cur->func; 651 while (func_cur) { 652 if ((func_cur->busno == busno) && 653 (func_cur->device == device) && 654 (func_cur->function == function)) 655 return func_cur; 656 func_cur = func_cur->next; 657 } 658 } 659 } 660 return NULL; 661 } 662 663 /************************************************************* 664 * This routine frees up memory used by struct slot, including 665 * the pointers to pci_func, bus, hotplug_slot, controller, 666 * and deregistering from the hotplug core 667 *************************************************************/ 668 static void free_slots(void) 669 { 670 struct slot *slot_cur, *next; 671 672 debug("%s -- enter\n", __func__); 673 674 list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head, 675 ibm_slot_list) { 676 pci_hp_deregister(slot_cur->hotplug_slot); 677 } 678 debug("%s -- exit\n", __func__); 679 } 680 681 static void ibm_unconfigure_device(struct pci_func *func) 682 { 683 struct pci_dev *temp; 684 u8 j; 685 686 debug("inside %s\n", __func__); 687 debug("func->device = %x, func->function = %x\n", 688 func->device, func->function); 689 debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0); 690 691 pci_lock_rescan_remove(); 692 693 for (j = 0; j < 0x08; j++) { 694 temp = pci_get_domain_bus_and_slot(0, func->busno, 695 (func->device << 3) | j); 696 if (temp) { 697 pci_stop_and_remove_bus_device(temp); 698 pci_dev_put(temp); 699 } 700 } 701 702 pci_dev_put(func->dev); 703 704 pci_unlock_rescan_remove(); 705 } 706 707 /* 708 * The following function is to fix kernel bug regarding 709 * getting bus entries, here we manually add those primary 710 * bus entries to kernel bus structure whenever apply 711 */ 712 static u8 bus_structure_fixup(u8 busno) 713 { 714 struct pci_bus *bus, *b; 715 struct pci_dev *dev; 716 u16 l; 717 718 if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno))) 719 return 1; 720 721 bus = kmalloc(sizeof(*bus), GFP_KERNEL); 722 if (!bus) 723 return 1; 724 725 dev = kmalloc(sizeof(*dev), GFP_KERNEL); 726 if (!dev) { 727 kfree(bus); 728 return 1; 729 } 730 731 bus->number = busno; 732 bus->ops = ibmphp_pci_bus->ops; 733 dev->bus = bus; 734 for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) { 735 if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) && 736 (l != 0x0000) && (l != 0xffff)) { 737 debug("%s - Inside bus_structure_fixup()\n", 738 __func__); 739 b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL); 740 if (!b) 741 continue; 742 743 pci_bus_add_devices(b); 744 break; 745 } 746 } 747 748 kfree(dev); 749 kfree(bus); 750 751 return 0; 752 } 753 754 static int ibm_configure_device(struct pci_func *func) 755 { 756 struct pci_bus *child; 757 int num; 758 int flag = 0; /* this is to make sure we don't double scan the bus, 759 for bridged devices primarily */ 760 761 pci_lock_rescan_remove(); 762 763 if (!(bus_structure_fixup(func->busno))) 764 flag = 1; 765 if (func->dev == NULL) 766 func->dev = pci_get_domain_bus_and_slot(0, func->busno, 767 PCI_DEVFN(func->device, func->function)); 768 769 if (func->dev == NULL) { 770 struct pci_bus *bus = pci_find_bus(0, func->busno); 771 if (!bus) 772 goto out; 773 774 num = pci_scan_slot(bus, 775 PCI_DEVFN(func->device, func->function)); 776 if (num) 777 pci_bus_add_devices(bus); 778 779 func->dev = pci_get_domain_bus_and_slot(0, func->busno, 780 PCI_DEVFN(func->device, func->function)); 781 if (func->dev == NULL) { 782 err("ERROR... : pci_dev still NULL\n"); 783 goto out; 784 } 785 } 786 if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) { 787 pci_hp_add_bridge(func->dev); 788 child = func->dev->subordinate; 789 if (child) 790 pci_bus_add_devices(child); 791 } 792 793 out: 794 pci_unlock_rescan_remove(); 795 return 0; 796 } 797 798 /******************************************************* 799 * Returns whether the bus is empty or not 800 *******************************************************/ 801 static int is_bus_empty(struct slot *slot_cur) 802 { 803 int rc; 804 struct slot *tmp_slot; 805 u8 i = slot_cur->bus_on->slot_min; 806 807 while (i <= slot_cur->bus_on->slot_max) { 808 if (i == slot_cur->number) { 809 i++; 810 continue; 811 } 812 tmp_slot = ibmphp_get_slot_from_physical_num(i); 813 if (!tmp_slot) 814 return 0; 815 rc = slot_update(&tmp_slot); 816 if (rc) 817 return 0; 818 if (SLOT_PRESENT(tmp_slot->status) && 819 SLOT_PWRGD(tmp_slot->status)) 820 return 0; 821 i++; 822 } 823 return 1; 824 } 825 826 /*********************************************************** 827 * If the HPC permits and the bus currently empty, tries to set the 828 * bus speed and mode at the maximum card and bus capability 829 * Parameters: slot 830 * Returns: bus is set (0) or error code 831 ***********************************************************/ 832 static int set_bus(struct slot *slot_cur) 833 { 834 int rc; 835 u8 speed; 836 u8 cmd = 0x0; 837 int retval; 838 static const struct pci_device_id ciobx[] = { 839 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) }, 840 { }, 841 }; 842 843 debug("%s - entry slot # %d\n", __func__, slot_cur->number); 844 if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) { 845 rc = slot_update(&slot_cur); 846 if (rc) 847 return rc; 848 speed = SLOT_SPEED(slot_cur->ext_status); 849 debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed); 850 switch (speed) { 851 case HPC_SLOT_SPEED_33: 852 cmd = HPC_BUS_33CONVMODE; 853 break; 854 case HPC_SLOT_SPEED_66: 855 if (SLOT_PCIX(slot_cur->ext_status)) { 856 if ((slot_cur->supported_speed >= BUS_SPEED_66) && 857 (slot_cur->supported_bus_mode == BUS_MODE_PCIX)) 858 cmd = HPC_BUS_66PCIXMODE; 859 else if (!SLOT_BUS_MODE(slot_cur->ext_status)) 860 /* if max slot/bus capability is 66 pci 861 and there's no bus mode mismatch, then 862 the adapter supports 66 pci */ 863 cmd = HPC_BUS_66CONVMODE; 864 else 865 cmd = HPC_BUS_33CONVMODE; 866 } else { 867 if (slot_cur->supported_speed >= BUS_SPEED_66) 868 cmd = HPC_BUS_66CONVMODE; 869 else 870 cmd = HPC_BUS_33CONVMODE; 871 } 872 break; 873 case HPC_SLOT_SPEED_133: 874 switch (slot_cur->supported_speed) { 875 case BUS_SPEED_33: 876 cmd = HPC_BUS_33CONVMODE; 877 break; 878 case BUS_SPEED_66: 879 if (slot_cur->supported_bus_mode == BUS_MODE_PCIX) 880 cmd = HPC_BUS_66PCIXMODE; 881 else 882 cmd = HPC_BUS_66CONVMODE; 883 break; 884 case BUS_SPEED_100: 885 cmd = HPC_BUS_100PCIXMODE; 886 break; 887 case BUS_SPEED_133: 888 /* This is to take care of the bug in CIOBX chip */ 889 if (pci_dev_present(ciobx)) 890 ibmphp_hpc_writeslot(slot_cur, 891 HPC_BUS_100PCIXMODE); 892 cmd = HPC_BUS_133PCIXMODE; 893 break; 894 default: 895 err("Wrong bus speed\n"); 896 return -ENODEV; 897 } 898 break; 899 default: 900 err("wrong slot speed\n"); 901 return -ENODEV; 902 } 903 debug("setting bus speed for slot %d, cmd %x\n", 904 slot_cur->number, cmd); 905 retval = ibmphp_hpc_writeslot(slot_cur, cmd); 906 if (retval) { 907 err("setting bus speed failed\n"); 908 return retval; 909 } 910 if (CTLR_RESULT(slot_cur->ctrl->status)) { 911 err("command not completed successfully in set_bus\n"); 912 return -EIO; 913 } 914 } 915 /* This is for x440, once Brandon fixes the firmware, 916 will not need this delay */ 917 msleep(1000); 918 debug("%s -Exit\n", __func__); 919 return 0; 920 } 921 922 /* This routine checks the bus limitations that the slot is on from the BIOS. 923 * This is used in deciding whether or not to power up the slot. 924 * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on 925 * same bus) 926 * Parameters: slot 927 * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus 928 */ 929 static int check_limitations(struct slot *slot_cur) 930 { 931 u8 i; 932 struct slot *tmp_slot; 933 u8 count = 0; 934 u8 limitation = 0; 935 936 for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) { 937 tmp_slot = ibmphp_get_slot_from_physical_num(i); 938 if (!tmp_slot) 939 return -ENODEV; 940 if ((SLOT_PWRGD(tmp_slot->status)) && 941 !(SLOT_CONNECT(tmp_slot->status))) 942 count++; 943 } 944 get_cur_bus_info(&slot_cur); 945 switch (slot_cur->bus_on->current_speed) { 946 case BUS_SPEED_33: 947 limitation = slot_cur->bus_on->slots_at_33_conv; 948 break; 949 case BUS_SPEED_66: 950 if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX) 951 limitation = slot_cur->bus_on->slots_at_66_pcix; 952 else 953 limitation = slot_cur->bus_on->slots_at_66_conv; 954 break; 955 case BUS_SPEED_100: 956 limitation = slot_cur->bus_on->slots_at_100_pcix; 957 break; 958 case BUS_SPEED_133: 959 limitation = slot_cur->bus_on->slots_at_133_pcix; 960 break; 961 } 962 963 if ((count + 1) > limitation) 964 return -EINVAL; 965 return 0; 966 } 967 968 static inline void print_card_capability(struct slot *slot_cur) 969 { 970 info("capability of the card is "); 971 if ((slot_cur->ext_status & CARD_INFO) == PCIX133) 972 info(" 133 MHz PCI-X\n"); 973 else if ((slot_cur->ext_status & CARD_INFO) == PCIX66) 974 info(" 66 MHz PCI-X\n"); 975 else if ((slot_cur->ext_status & CARD_INFO) == PCI66) 976 info(" 66 MHz PCI\n"); 977 else 978 info(" 33 MHz PCI\n"); 979 980 } 981 982 /* This routine will power on the slot, configure the device(s) and find the 983 * drivers for them. 984 * Parameters: hotplug_slot 985 * Returns: 0 or failure codes 986 */ 987 static int enable_slot(struct hotplug_slot *hs) 988 { 989 int rc, i, rcpr; 990 struct slot *slot_cur; 991 u8 function; 992 struct pci_func *tmp_func; 993 994 ibmphp_lock_operations(); 995 996 debug("ENABLING SLOT........\n"); 997 slot_cur = hs->private; 998 999 rc = validate(slot_cur, ENABLE); 1000 if (rc) { 1001 err("validate function failed\n"); 1002 goto error_nopower; 1003 } 1004 1005 attn_LED_blink(slot_cur); 1006 1007 rc = set_bus(slot_cur); 1008 if (rc) { 1009 err("was not able to set the bus\n"); 1010 goto error_nopower; 1011 } 1012 1013 /*-----------------debugging------------------------------*/ 1014 get_cur_bus_info(&slot_cur); 1015 debug("the current bus speed right after set_bus = %x\n", 1016 slot_cur->bus_on->current_speed); 1017 /*----------------------------------------------------------*/ 1018 1019 rc = check_limitations(slot_cur); 1020 if (rc) { 1021 err("Adding this card exceeds the limitations of this bus.\n"); 1022 err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n"); 1023 err("Try hot-adding into another bus\n"); 1024 rc = -EINVAL; 1025 goto error_nopower; 1026 } 1027 1028 rc = power_on(slot_cur); 1029 1030 if (rc) { 1031 err("something wrong when powering up... please see below for details\n"); 1032 /* need to turn off before on, otherwise, blinking overwrites */ 1033 attn_off(slot_cur); 1034 attn_on(slot_cur); 1035 if (slot_update(&slot_cur)) { 1036 attn_off(slot_cur); 1037 attn_on(slot_cur); 1038 rc = -ENODEV; 1039 goto exit; 1040 } 1041 /* Check to see the error of why it failed */ 1042 if ((SLOT_POWER(slot_cur->status)) && 1043 !(SLOT_PWRGD(slot_cur->status))) 1044 err("power fault occurred trying to power up\n"); 1045 else if (SLOT_BUS_SPEED(slot_cur->status)) { 1046 err("bus speed mismatch occurred. please check current bus speed and card capability\n"); 1047 print_card_capability(slot_cur); 1048 } else if (SLOT_BUS_MODE(slot_cur->ext_status)) { 1049 err("bus mode mismatch occurred. please check current bus mode and card capability\n"); 1050 print_card_capability(slot_cur); 1051 } 1052 ibmphp_update_slot_info(slot_cur); 1053 goto exit; 1054 } 1055 debug("after power_on\n"); 1056 /*-----------------------debugging---------------------------*/ 1057 get_cur_bus_info(&slot_cur); 1058 debug("the current bus speed right after power_on = %x\n", 1059 slot_cur->bus_on->current_speed); 1060 /*----------------------------------------------------------*/ 1061 1062 rc = slot_update(&slot_cur); 1063 if (rc) 1064 goto error_power; 1065 1066 rc = -EINVAL; 1067 if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) { 1068 err("power fault occurred trying to power up...\n"); 1069 goto error_power; 1070 } 1071 if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) { 1072 err("bus speed mismatch occurred. please check current bus speed and card capability\n"); 1073 print_card_capability(slot_cur); 1074 goto error_power; 1075 } 1076 /* Don't think this case will happen after above checks... 1077 * but just in case, for paranoia sake */ 1078 if (!(SLOT_POWER(slot_cur->status))) { 1079 err("power on failed...\n"); 1080 goto error_power; 1081 } 1082 1083 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL); 1084 if (!slot_cur->func) { 1085 /* We cannot do update_slot_info here, since no memory for 1086 * kmalloc n.e.ways, and update_slot_info allocates some */ 1087 rc = -ENOMEM; 1088 goto error_power; 1089 } 1090 slot_cur->func->busno = slot_cur->bus; 1091 slot_cur->func->device = slot_cur->device; 1092 for (i = 0; i < 4; i++) 1093 slot_cur->func->irq[i] = slot_cur->irq[i]; 1094 1095 debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n", 1096 slot_cur->bus, slot_cur->device); 1097 1098 if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) { 1099 err("configure_card was unsuccessful...\n"); 1100 /* true because don't need to actually deallocate resources, 1101 * just remove references */ 1102 ibmphp_unconfigure_card(&slot_cur, 1); 1103 debug("after unconfigure_card\n"); 1104 slot_cur->func = NULL; 1105 rc = -ENOMEM; 1106 goto error_power; 1107 } 1108 1109 function = 0x00; 1110 do { 1111 tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device, 1112 function++); 1113 if (tmp_func && !(tmp_func->dev)) 1114 ibm_configure_device(tmp_func); 1115 } while (tmp_func); 1116 1117 attn_off(slot_cur); 1118 if (slot_update(&slot_cur)) { 1119 rc = -EFAULT; 1120 goto exit; 1121 } 1122 ibmphp_print_test(); 1123 rc = ibmphp_update_slot_info(slot_cur); 1124 exit: 1125 ibmphp_unlock_operations(); 1126 return rc; 1127 1128 error_nopower: 1129 attn_off(slot_cur); /* need to turn off if was blinking b4 */ 1130 attn_on(slot_cur); 1131 error_cont: 1132 rcpr = slot_update(&slot_cur); 1133 if (rcpr) { 1134 rc = rcpr; 1135 goto exit; 1136 } 1137 ibmphp_update_slot_info(slot_cur); 1138 goto exit; 1139 1140 error_power: 1141 attn_off(slot_cur); /* need to turn off if was blinking b4 */ 1142 attn_on(slot_cur); 1143 rcpr = power_off(slot_cur); 1144 if (rcpr) { 1145 rc = rcpr; 1146 goto exit; 1147 } 1148 goto error_cont; 1149 } 1150 1151 /************************************************************** 1152 * HOT REMOVING ADAPTER CARD * 1153 * INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE * 1154 * OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE * 1155 * DISABLE POWER , * 1156 **************************************************************/ 1157 static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot) 1158 { 1159 struct slot *slot = hotplug_slot->private; 1160 int rc; 1161 1162 ibmphp_lock_operations(); 1163 rc = ibmphp_do_disable_slot(slot); 1164 ibmphp_unlock_operations(); 1165 return rc; 1166 } 1167 1168 int ibmphp_do_disable_slot(struct slot *slot_cur) 1169 { 1170 int rc; 1171 u8 flag; 1172 1173 debug("DISABLING SLOT...\n"); 1174 1175 if ((slot_cur == NULL) || (slot_cur->ctrl == NULL)) 1176 return -ENODEV; 1177 1178 flag = slot_cur->flag; 1179 slot_cur->flag = 1; 1180 1181 if (flag == 1) { 1182 rc = validate(slot_cur, DISABLE); 1183 /* checking if powered off already & valid slot # */ 1184 if (rc) 1185 goto error; 1186 } 1187 attn_LED_blink(slot_cur); 1188 1189 if (slot_cur->func == NULL) { 1190 /* We need this for functions that were there on bootup */ 1191 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL); 1192 if (!slot_cur->func) { 1193 rc = -ENOMEM; 1194 goto error; 1195 } 1196 slot_cur->func->busno = slot_cur->bus; 1197 slot_cur->func->device = slot_cur->device; 1198 } 1199 1200 ibm_unconfigure_device(slot_cur->func); 1201 1202 /* 1203 * If we got here from latch suddenly opening on operating card or 1204 * a power fault, there's no power to the card, so cannot 1205 * read from it to determine what resources it occupied. This operation 1206 * is forbidden anyhow. The best we can do is remove it from kernel 1207 * lists at least */ 1208 1209 if (!flag) { 1210 attn_off(slot_cur); 1211 return 0; 1212 } 1213 1214 rc = ibmphp_unconfigure_card(&slot_cur, 0); 1215 slot_cur->func = NULL; 1216 debug("in disable_slot. after unconfigure_card\n"); 1217 if (rc) { 1218 err("could not unconfigure card.\n"); 1219 goto error; 1220 } 1221 1222 rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF); 1223 if (rc) 1224 goto error; 1225 1226 attn_off(slot_cur); 1227 rc = slot_update(&slot_cur); 1228 if (rc) 1229 goto exit; 1230 1231 rc = ibmphp_update_slot_info(slot_cur); 1232 ibmphp_print_test(); 1233 exit: 1234 return rc; 1235 1236 error: 1237 /* Need to turn off if was blinking b4 */ 1238 attn_off(slot_cur); 1239 attn_on(slot_cur); 1240 if (slot_update(&slot_cur)) { 1241 rc = -EFAULT; 1242 goto exit; 1243 } 1244 if (flag) 1245 ibmphp_update_slot_info(slot_cur); 1246 goto exit; 1247 } 1248 1249 struct hotplug_slot_ops ibmphp_hotplug_slot_ops = { 1250 .set_attention_status = set_attention_status, 1251 .enable_slot = enable_slot, 1252 .disable_slot = ibmphp_disable_slot, 1253 .hardware_test = NULL, 1254 .get_power_status = get_power_status, 1255 .get_attention_status = get_attention_status, 1256 .get_latch_status = get_latch_status, 1257 .get_adapter_status = get_adapter_present, 1258 /* .get_max_adapter_speed = get_max_adapter_speed, 1259 .get_bus_name_status = get_bus_name, 1260 */ 1261 }; 1262 1263 static void ibmphp_unload(void) 1264 { 1265 free_slots(); 1266 debug("after slots\n"); 1267 ibmphp_free_resources(); 1268 debug("after resources\n"); 1269 ibmphp_free_bus_info_queue(); 1270 debug("after bus info\n"); 1271 ibmphp_free_ebda_hpc_queue(); 1272 debug("after ebda hpc\n"); 1273 ibmphp_free_ebda_pci_rsrc_queue(); 1274 debug("after ebda pci rsrc\n"); 1275 kfree(ibmphp_pci_bus); 1276 } 1277 1278 static int __init ibmphp_init(void) 1279 { 1280 struct pci_bus *bus; 1281 int i = 0; 1282 int rc = 0; 1283 1284 init_flag = 1; 1285 1286 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 1287 1288 ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL); 1289 if (!ibmphp_pci_bus) { 1290 rc = -ENOMEM; 1291 goto exit; 1292 } 1293 1294 bus = pci_find_bus(0, 0); 1295 if (!bus) { 1296 err("Can't find the root pci bus, can not continue\n"); 1297 rc = -ENODEV; 1298 goto error; 1299 } 1300 memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus)); 1301 1302 ibmphp_debug = debug; 1303 1304 ibmphp_hpc_initvars(); 1305 1306 for (i = 0; i < 16; i++) 1307 irqs[i] = 0; 1308 1309 rc = ibmphp_access_ebda(); 1310 if (rc) 1311 goto error; 1312 debug("after ibmphp_access_ebda()\n"); 1313 1314 rc = ibmphp_rsrc_init(); 1315 if (rc) 1316 goto error; 1317 debug("AFTER Resource & EBDA INITIALIZATIONS\n"); 1318 1319 max_slots = get_max_slots(); 1320 1321 rc = ibmphp_register_pci(); 1322 if (rc) 1323 goto error; 1324 1325 if (init_ops()) { 1326 rc = -ENODEV; 1327 goto error; 1328 } 1329 1330 ibmphp_print_test(); 1331 rc = ibmphp_hpc_start_poll_thread(); 1332 if (rc) 1333 goto error; 1334 1335 exit: 1336 return rc; 1337 1338 error: 1339 ibmphp_unload(); 1340 goto exit; 1341 } 1342 1343 static void __exit ibmphp_exit(void) 1344 { 1345 ibmphp_hpc_stop_poll_thread(); 1346 debug("after polling\n"); 1347 ibmphp_unload(); 1348 debug("done\n"); 1349 } 1350 1351 module_init(ibmphp_init); 1352 module_exit(ibmphp_exit); 1353