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 = to_slot(hotplug_slot); 251 rc = ibmphp_hpc_writeslot(pslot, cmd); 252 } 253 } else 254 rc = -ENODEV; 255 256 ibmphp_unlock_operations(); 257 258 debug("set_attention_status - Exit rc[%d]\n", rc); 259 return rc; 260 } 261 262 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 263 { 264 int rc = -ENODEV; 265 struct slot *pslot; 266 struct slot myslot; 267 268 debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 269 (ulong) hotplug_slot, (ulong) value); 270 271 ibmphp_lock_operations(); 272 if (hotplug_slot) { 273 pslot = to_slot(hotplug_slot); 274 memcpy(&myslot, pslot, sizeof(struct slot)); 275 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 276 &myslot.status); 277 if (!rc) 278 rc = ibmphp_hpc_readslot(pslot, READ_EXTSLOTSTATUS, 279 &myslot.ext_status); 280 if (!rc) 281 *value = SLOT_ATTN(myslot.status, myslot.ext_status); 282 } 283 284 ibmphp_unlock_operations(); 285 debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value); 286 return rc; 287 } 288 289 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) 290 { 291 int rc = -ENODEV; 292 struct slot *pslot; 293 struct slot myslot; 294 295 debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 296 (ulong) hotplug_slot, (ulong) value); 297 ibmphp_lock_operations(); 298 if (hotplug_slot) { 299 pslot = to_slot(hotplug_slot); 300 memcpy(&myslot, pslot, sizeof(struct slot)); 301 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 302 &myslot.status); 303 if (!rc) 304 *value = SLOT_LATCH(myslot.status); 305 } 306 307 ibmphp_unlock_operations(); 308 debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n", 309 rc, rc, *value); 310 return rc; 311 } 312 313 314 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 315 { 316 int rc = -ENODEV; 317 struct slot *pslot; 318 struct slot myslot; 319 320 debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 321 (ulong) hotplug_slot, (ulong) value); 322 ibmphp_lock_operations(); 323 if (hotplug_slot) { 324 pslot = to_slot(hotplug_slot); 325 memcpy(&myslot, pslot, sizeof(struct slot)); 326 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 327 &myslot.status); 328 if (!rc) 329 *value = SLOT_PWRGD(myslot.status); 330 } 331 332 ibmphp_unlock_operations(); 333 debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n", 334 rc, rc, *value); 335 return rc; 336 } 337 338 static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value) 339 { 340 int rc = -ENODEV; 341 struct slot *pslot; 342 u8 present; 343 struct slot myslot; 344 345 debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n", 346 (ulong) hotplug_slot, (ulong) value); 347 ibmphp_lock_operations(); 348 if (hotplug_slot) { 349 pslot = to_slot(hotplug_slot); 350 memcpy(&myslot, pslot, sizeof(struct slot)); 351 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 352 &myslot.status); 353 if (!rc) { 354 present = SLOT_PRESENT(myslot.status); 355 if (present == HPC_SLOT_EMPTY) 356 *value = 0; 357 else 358 *value = 1; 359 } 360 } 361 362 ibmphp_unlock_operations(); 363 debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value); 364 return rc; 365 } 366 367 static int get_max_bus_speed(struct slot *slot) 368 { 369 int rc = 0; 370 u8 mode = 0; 371 enum pci_bus_speed speed; 372 struct pci_bus *bus = slot->hotplug_slot.pci_slot->bus; 373 374 debug("%s - Entry slot[%p]\n", __func__, slot); 375 376 ibmphp_lock_operations(); 377 mode = slot->supported_bus_mode; 378 speed = slot->supported_speed; 379 ibmphp_unlock_operations(); 380 381 switch (speed) { 382 case BUS_SPEED_33: 383 break; 384 case BUS_SPEED_66: 385 if (mode == BUS_MODE_PCIX) 386 speed += 0x01; 387 break; 388 case BUS_SPEED_100: 389 case BUS_SPEED_133: 390 speed += 0x01; 391 break; 392 default: 393 /* Note (will need to change): there would be soon 256, 512 also */ 394 rc = -ENODEV; 395 } 396 397 if (!rc) 398 bus->max_bus_speed = speed; 399 400 debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed); 401 return rc; 402 } 403 404 /* 405 static int get_max_adapter_speed_1(struct hotplug_slot *hotplug_slot, u8 *value, u8 flag) 406 { 407 int rc = -ENODEV; 408 struct slot *pslot; 409 struct slot myslot; 410 411 debug("get_max_adapter_speed_1 - Entry hotplug_slot[%lx] pvalue[%lx]\n", 412 (ulong)hotplug_slot, (ulong) value); 413 414 if (flag) 415 ibmphp_lock_operations(); 416 417 if (hotplug_slot && value) { 418 pslot = hotplug_slot->private; 419 if (pslot) { 420 memcpy(&myslot, pslot, sizeof(struct slot)); 421 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, 422 &(myslot.status)); 423 424 if (!(SLOT_LATCH (myslot.status)) && 425 (SLOT_PRESENT (myslot.status))) { 426 rc = ibmphp_hpc_readslot(pslot, 427 READ_EXTSLOTSTATUS, 428 &(myslot.ext_status)); 429 if (!rc) 430 *value = SLOT_SPEED(myslot.ext_status); 431 } else 432 *value = MAX_ADAPTER_NONE; 433 } 434 } 435 436 if (flag) 437 ibmphp_unlock_operations(); 438 439 debug("get_max_adapter_speed_1 - Exit rc[%d] value[%x]\n", rc, *value); 440 return rc; 441 } 442 443 static int get_bus_name(struct hotplug_slot *hotplug_slot, char *value) 444 { 445 int rc = -ENODEV; 446 struct slot *pslot = NULL; 447 448 debug("get_bus_name - Entry hotplug_slot[%lx]\n", (ulong)hotplug_slot); 449 450 ibmphp_lock_operations(); 451 452 if (hotplug_slot) { 453 pslot = hotplug_slot->private; 454 if (pslot) { 455 rc = 0; 456 snprintf(value, 100, "Bus %x", pslot->bus); 457 } 458 } else 459 rc = -ENODEV; 460 461 ibmphp_unlock_operations(); 462 debug("get_bus_name - Exit rc[%d] value[%x]\n", rc, *value); 463 return rc; 464 } 465 */ 466 467 /**************************************************************************** 468 * This routine will initialize the ops data structure used in the validate 469 * function. It will also power off empty slots that are powered on since BIOS 470 * leaves those on, albeit disconnected 471 ****************************************************************************/ 472 static int __init init_ops(void) 473 { 474 struct slot *slot_cur; 475 int retval; 476 int rc; 477 478 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) { 479 debug("BEFORE GETTING SLOT STATUS, slot # %x\n", 480 slot_cur->number); 481 if (slot_cur->ctrl->revision == 0xFF) 482 if (get_ctrl_revision(slot_cur, 483 &slot_cur->ctrl->revision)) 484 return -1; 485 486 if (slot_cur->bus_on->current_speed == 0xFF) 487 if (get_cur_bus_info(&slot_cur)) 488 return -1; 489 get_max_bus_speed(slot_cur); 490 491 if (slot_cur->ctrl->options == 0xFF) 492 if (get_hpc_options(slot_cur, &slot_cur->ctrl->options)) 493 return -1; 494 495 retval = slot_update(&slot_cur); 496 if (retval) 497 return retval; 498 499 debug("status = %x\n", slot_cur->status); 500 debug("ext_status = %x\n", slot_cur->ext_status); 501 debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status)); 502 debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status)); 503 debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status)); 504 505 if ((SLOT_PWRGD(slot_cur->status)) && 506 !(SLOT_PRESENT(slot_cur->status)) && 507 !(SLOT_LATCH(slot_cur->status))) { 508 debug("BEFORE POWER OFF COMMAND\n"); 509 rc = power_off(slot_cur); 510 if (rc) 511 return rc; 512 513 /* retval = slot_update(&slot_cur); 514 * if (retval) 515 * return retval; 516 * ibmphp_update_slot_info(slot_cur); 517 */ 518 } 519 } 520 init_flag = 0; 521 return 0; 522 } 523 524 /* This operation will check whether the slot is within the bounds and 525 * the operation is valid to perform on that slot 526 * Parameters: slot, operation 527 * Returns: 0 or error codes 528 */ 529 static int validate(struct slot *slot_cur, int opn) 530 { 531 int number; 532 int retval; 533 534 if (!slot_cur) 535 return -ENODEV; 536 number = slot_cur->number; 537 if ((number > max_slots) || (number < 0)) 538 return -EBADSLT; 539 debug("slot_number in validate is %d\n", slot_cur->number); 540 541 retval = slot_update(&slot_cur); 542 if (retval) 543 return retval; 544 545 switch (opn) { 546 case ENABLE: 547 if (!(SLOT_PWRGD(slot_cur->status)) && 548 (SLOT_PRESENT(slot_cur->status)) && 549 !(SLOT_LATCH(slot_cur->status))) 550 return 0; 551 break; 552 case DISABLE: 553 if ((SLOT_PWRGD(slot_cur->status)) && 554 (SLOT_PRESENT(slot_cur->status)) && 555 !(SLOT_LATCH(slot_cur->status))) 556 return 0; 557 break; 558 default: 559 break; 560 } 561 err("validate failed....\n"); 562 return -EINVAL; 563 } 564 565 /**************************************************************************** 566 * This routine is for updating the data structures in the hotplug core 567 * Parameters: struct slot 568 * Returns: 0 or error 569 ****************************************************************************/ 570 int ibmphp_update_slot_info(struct slot *slot_cur) 571 { 572 struct pci_bus *bus = slot_cur->hotplug_slot.pci_slot->bus; 573 u8 bus_speed; 574 u8 mode; 575 576 bus_speed = slot_cur->bus_on->current_speed; 577 mode = slot_cur->bus_on->current_bus_mode; 578 579 switch (bus_speed) { 580 case BUS_SPEED_33: 581 break; 582 case BUS_SPEED_66: 583 if (mode == BUS_MODE_PCIX) 584 bus_speed += 0x01; 585 else if (mode == BUS_MODE_PCI) 586 ; 587 else 588 bus_speed = PCI_SPEED_UNKNOWN; 589 break; 590 case BUS_SPEED_100: 591 case BUS_SPEED_133: 592 bus_speed += 0x01; 593 break; 594 default: 595 bus_speed = PCI_SPEED_UNKNOWN; 596 } 597 598 bus->cur_bus_speed = bus_speed; 599 // To do: bus_names 600 601 return 0; 602 } 603 604 605 /****************************************************************************** 606 * This function will return the pci_func, given bus and devfunc, or NULL. It 607 * is called from visit routines 608 ******************************************************************************/ 609 610 static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function) 611 { 612 struct pci_func *func_cur; 613 struct slot *slot_cur; 614 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) { 615 if (slot_cur->func) { 616 func_cur = slot_cur->func; 617 while (func_cur) { 618 if ((func_cur->busno == busno) && 619 (func_cur->device == device) && 620 (func_cur->function == function)) 621 return func_cur; 622 func_cur = func_cur->next; 623 } 624 } 625 } 626 return NULL; 627 } 628 629 /************************************************************* 630 * This routine frees up memory used by struct slot, including 631 * the pointers to pci_func, bus, hotplug_slot, controller, 632 * and deregistering from the hotplug core 633 *************************************************************/ 634 static void free_slots(void) 635 { 636 struct slot *slot_cur, *next; 637 638 debug("%s -- enter\n", __func__); 639 640 list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head, 641 ibm_slot_list) { 642 pci_hp_del(&slot_cur->hotplug_slot); 643 slot_cur->ctrl = NULL; 644 slot_cur->bus_on = NULL; 645 646 /* 647 * We don't want to actually remove the resources, 648 * since ibmphp_free_resources() will do just that. 649 */ 650 ibmphp_unconfigure_card(&slot_cur, -1); 651 652 pci_hp_destroy(&slot_cur->hotplug_slot); 653 kfree(slot_cur); 654 } 655 debug("%s -- exit\n", __func__); 656 } 657 658 static void ibm_unconfigure_device(struct pci_func *func) 659 { 660 struct pci_dev *temp; 661 u8 j; 662 663 debug("inside %s\n", __func__); 664 debug("func->device = %x, func->function = %x\n", 665 func->device, func->function); 666 debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0); 667 668 pci_lock_rescan_remove(); 669 670 for (j = 0; j < 0x08; j++) { 671 temp = pci_get_domain_bus_and_slot(0, func->busno, 672 (func->device << 3) | j); 673 if (temp) { 674 pci_stop_and_remove_bus_device(temp); 675 pci_dev_put(temp); 676 } 677 } 678 679 pci_dev_put(func->dev); 680 681 pci_unlock_rescan_remove(); 682 } 683 684 /* 685 * The following function is to fix kernel bug regarding 686 * getting bus entries, here we manually add those primary 687 * bus entries to kernel bus structure whenever apply 688 */ 689 static u8 bus_structure_fixup(u8 busno) 690 { 691 struct pci_bus *bus, *b; 692 struct pci_dev *dev; 693 u16 l; 694 695 if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno))) 696 return 1; 697 698 bus = kmalloc(sizeof(*bus), GFP_KERNEL); 699 if (!bus) 700 return 1; 701 702 dev = kmalloc(sizeof(*dev), GFP_KERNEL); 703 if (!dev) { 704 kfree(bus); 705 return 1; 706 } 707 708 bus->number = busno; 709 bus->ops = ibmphp_pci_bus->ops; 710 dev->bus = bus; 711 for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) { 712 if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) && 713 (l != 0x0000) && (l != 0xffff)) { 714 debug("%s - Inside bus_structure_fixup()\n", 715 __func__); 716 b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL); 717 if (!b) 718 continue; 719 720 pci_bus_add_devices(b); 721 break; 722 } 723 } 724 725 kfree(dev); 726 kfree(bus); 727 728 return 0; 729 } 730 731 static int ibm_configure_device(struct pci_func *func) 732 { 733 struct pci_bus *child; 734 int num; 735 int flag = 0; /* this is to make sure we don't double scan the bus, 736 for bridged devices primarily */ 737 738 pci_lock_rescan_remove(); 739 740 if (!(bus_structure_fixup(func->busno))) 741 flag = 1; 742 if (func->dev == NULL) 743 func->dev = pci_get_domain_bus_and_slot(0, func->busno, 744 PCI_DEVFN(func->device, func->function)); 745 746 if (func->dev == NULL) { 747 struct pci_bus *bus = pci_find_bus(0, func->busno); 748 if (!bus) 749 goto out; 750 751 num = pci_scan_slot(bus, 752 PCI_DEVFN(func->device, func->function)); 753 if (num) 754 pci_bus_add_devices(bus); 755 756 func->dev = pci_get_domain_bus_and_slot(0, func->busno, 757 PCI_DEVFN(func->device, func->function)); 758 if (func->dev == NULL) { 759 err("ERROR... : pci_dev still NULL\n"); 760 goto out; 761 } 762 } 763 if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) { 764 pci_hp_add_bridge(func->dev); 765 child = func->dev->subordinate; 766 if (child) 767 pci_bus_add_devices(child); 768 } 769 770 out: 771 pci_unlock_rescan_remove(); 772 return 0; 773 } 774 775 /******************************************************* 776 * Returns whether the bus is empty or not 777 *******************************************************/ 778 static int is_bus_empty(struct slot *slot_cur) 779 { 780 int rc; 781 struct slot *tmp_slot; 782 u8 i = slot_cur->bus_on->slot_min; 783 784 while (i <= slot_cur->bus_on->slot_max) { 785 if (i == slot_cur->number) { 786 i++; 787 continue; 788 } 789 tmp_slot = ibmphp_get_slot_from_physical_num(i); 790 if (!tmp_slot) 791 return 0; 792 rc = slot_update(&tmp_slot); 793 if (rc) 794 return 0; 795 if (SLOT_PRESENT(tmp_slot->status) && 796 SLOT_PWRGD(tmp_slot->status)) 797 return 0; 798 i++; 799 } 800 return 1; 801 } 802 803 /*********************************************************** 804 * If the HPC permits and the bus currently empty, tries to set the 805 * bus speed and mode at the maximum card and bus capability 806 * Parameters: slot 807 * Returns: bus is set (0) or error code 808 ***********************************************************/ 809 static int set_bus(struct slot *slot_cur) 810 { 811 int rc; 812 u8 speed; 813 u8 cmd = 0x0; 814 int retval; 815 static const struct pci_device_id ciobx[] = { 816 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) }, 817 { }, 818 }; 819 820 debug("%s - entry slot # %d\n", __func__, slot_cur->number); 821 if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) { 822 rc = slot_update(&slot_cur); 823 if (rc) 824 return rc; 825 speed = SLOT_SPEED(slot_cur->ext_status); 826 debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed); 827 switch (speed) { 828 case HPC_SLOT_SPEED_33: 829 cmd = HPC_BUS_33CONVMODE; 830 break; 831 case HPC_SLOT_SPEED_66: 832 if (SLOT_PCIX(slot_cur->ext_status)) { 833 if ((slot_cur->supported_speed >= BUS_SPEED_66) && 834 (slot_cur->supported_bus_mode == BUS_MODE_PCIX)) 835 cmd = HPC_BUS_66PCIXMODE; 836 else if (!SLOT_BUS_MODE(slot_cur->ext_status)) 837 /* if max slot/bus capability is 66 pci 838 and there's no bus mode mismatch, then 839 the adapter supports 66 pci */ 840 cmd = HPC_BUS_66CONVMODE; 841 else 842 cmd = HPC_BUS_33CONVMODE; 843 } else { 844 if (slot_cur->supported_speed >= BUS_SPEED_66) 845 cmd = HPC_BUS_66CONVMODE; 846 else 847 cmd = HPC_BUS_33CONVMODE; 848 } 849 break; 850 case HPC_SLOT_SPEED_133: 851 switch (slot_cur->supported_speed) { 852 case BUS_SPEED_33: 853 cmd = HPC_BUS_33CONVMODE; 854 break; 855 case BUS_SPEED_66: 856 if (slot_cur->supported_bus_mode == BUS_MODE_PCIX) 857 cmd = HPC_BUS_66PCIXMODE; 858 else 859 cmd = HPC_BUS_66CONVMODE; 860 break; 861 case BUS_SPEED_100: 862 cmd = HPC_BUS_100PCIXMODE; 863 break; 864 case BUS_SPEED_133: 865 /* This is to take care of the bug in CIOBX chip */ 866 if (pci_dev_present(ciobx)) 867 ibmphp_hpc_writeslot(slot_cur, 868 HPC_BUS_100PCIXMODE); 869 cmd = HPC_BUS_133PCIXMODE; 870 break; 871 default: 872 err("Wrong bus speed\n"); 873 return -ENODEV; 874 } 875 break; 876 default: 877 err("wrong slot speed\n"); 878 return -ENODEV; 879 } 880 debug("setting bus speed for slot %d, cmd %x\n", 881 slot_cur->number, cmd); 882 retval = ibmphp_hpc_writeslot(slot_cur, cmd); 883 if (retval) { 884 err("setting bus speed failed\n"); 885 return retval; 886 } 887 if (CTLR_RESULT(slot_cur->ctrl->status)) { 888 err("command not completed successfully in set_bus\n"); 889 return -EIO; 890 } 891 } 892 /* This is for x440, once Brandon fixes the firmware, 893 will not need this delay */ 894 msleep(1000); 895 debug("%s -Exit\n", __func__); 896 return 0; 897 } 898 899 /* This routine checks the bus limitations that the slot is on from the BIOS. 900 * This is used in deciding whether or not to power up the slot. 901 * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on 902 * same bus) 903 * Parameters: slot 904 * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus 905 */ 906 static int check_limitations(struct slot *slot_cur) 907 { 908 u8 i; 909 struct slot *tmp_slot; 910 u8 count = 0; 911 u8 limitation = 0; 912 913 for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) { 914 tmp_slot = ibmphp_get_slot_from_physical_num(i); 915 if (!tmp_slot) 916 return -ENODEV; 917 if ((SLOT_PWRGD(tmp_slot->status)) && 918 !(SLOT_CONNECT(tmp_slot->status))) 919 count++; 920 } 921 get_cur_bus_info(&slot_cur); 922 switch (slot_cur->bus_on->current_speed) { 923 case BUS_SPEED_33: 924 limitation = slot_cur->bus_on->slots_at_33_conv; 925 break; 926 case BUS_SPEED_66: 927 if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX) 928 limitation = slot_cur->bus_on->slots_at_66_pcix; 929 else 930 limitation = slot_cur->bus_on->slots_at_66_conv; 931 break; 932 case BUS_SPEED_100: 933 limitation = slot_cur->bus_on->slots_at_100_pcix; 934 break; 935 case BUS_SPEED_133: 936 limitation = slot_cur->bus_on->slots_at_133_pcix; 937 break; 938 } 939 940 if ((count + 1) > limitation) 941 return -EINVAL; 942 return 0; 943 } 944 945 static inline void print_card_capability(struct slot *slot_cur) 946 { 947 info("capability of the card is "); 948 if ((slot_cur->ext_status & CARD_INFO) == PCIX133) 949 info(" 133 MHz PCI-X\n"); 950 else if ((slot_cur->ext_status & CARD_INFO) == PCIX66) 951 info(" 66 MHz PCI-X\n"); 952 else if ((slot_cur->ext_status & CARD_INFO) == PCI66) 953 info(" 66 MHz PCI\n"); 954 else 955 info(" 33 MHz PCI\n"); 956 957 } 958 959 /* This routine will power on the slot, configure the device(s) and find the 960 * drivers for them. 961 * Parameters: hotplug_slot 962 * Returns: 0 or failure codes 963 */ 964 static int enable_slot(struct hotplug_slot *hs) 965 { 966 int rc, i, rcpr; 967 struct slot *slot_cur; 968 u8 function; 969 struct pci_func *tmp_func; 970 971 ibmphp_lock_operations(); 972 973 debug("ENABLING SLOT........\n"); 974 slot_cur = to_slot(hs); 975 976 rc = validate(slot_cur, ENABLE); 977 if (rc) { 978 err("validate function failed\n"); 979 goto error_nopower; 980 } 981 982 attn_LED_blink(slot_cur); 983 984 rc = set_bus(slot_cur); 985 if (rc) { 986 err("was not able to set the bus\n"); 987 goto error_nopower; 988 } 989 990 /*-----------------debugging------------------------------*/ 991 get_cur_bus_info(&slot_cur); 992 debug("the current bus speed right after set_bus = %x\n", 993 slot_cur->bus_on->current_speed); 994 /*----------------------------------------------------------*/ 995 996 rc = check_limitations(slot_cur); 997 if (rc) { 998 err("Adding this card exceeds the limitations of this bus.\n"); 999 err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n"); 1000 err("Try hot-adding into another bus\n"); 1001 rc = -EINVAL; 1002 goto error_nopower; 1003 } 1004 1005 rc = power_on(slot_cur); 1006 1007 if (rc) { 1008 err("something wrong when powering up... please see below for details\n"); 1009 /* need to turn off before on, otherwise, blinking overwrites */ 1010 attn_off(slot_cur); 1011 attn_on(slot_cur); 1012 if (slot_update(&slot_cur)) { 1013 attn_off(slot_cur); 1014 attn_on(slot_cur); 1015 rc = -ENODEV; 1016 goto exit; 1017 } 1018 /* Check to see the error of why it failed */ 1019 if ((SLOT_POWER(slot_cur->status)) && 1020 !(SLOT_PWRGD(slot_cur->status))) 1021 err("power fault occurred trying to power up\n"); 1022 else if (SLOT_BUS_SPEED(slot_cur->status)) { 1023 err("bus speed mismatch occurred. please check current bus speed and card capability\n"); 1024 print_card_capability(slot_cur); 1025 } else if (SLOT_BUS_MODE(slot_cur->ext_status)) { 1026 err("bus mode mismatch occurred. please check current bus mode and card capability\n"); 1027 print_card_capability(slot_cur); 1028 } 1029 ibmphp_update_slot_info(slot_cur); 1030 goto exit; 1031 } 1032 debug("after power_on\n"); 1033 /*-----------------------debugging---------------------------*/ 1034 get_cur_bus_info(&slot_cur); 1035 debug("the current bus speed right after power_on = %x\n", 1036 slot_cur->bus_on->current_speed); 1037 /*----------------------------------------------------------*/ 1038 1039 rc = slot_update(&slot_cur); 1040 if (rc) 1041 goto error_power; 1042 1043 rc = -EINVAL; 1044 if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) { 1045 err("power fault occurred trying to power up...\n"); 1046 goto error_power; 1047 } 1048 if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) { 1049 err("bus speed mismatch occurred. please check current bus speed and card capability\n"); 1050 print_card_capability(slot_cur); 1051 goto error_power; 1052 } 1053 /* Don't think this case will happen after above checks... 1054 * but just in case, for paranoia sake */ 1055 if (!(SLOT_POWER(slot_cur->status))) { 1056 err("power on failed...\n"); 1057 goto error_power; 1058 } 1059 1060 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL); 1061 if (!slot_cur->func) { 1062 /* do update_slot_info here? */ 1063 rc = -ENOMEM; 1064 goto error_power; 1065 } 1066 slot_cur->func->busno = slot_cur->bus; 1067 slot_cur->func->device = slot_cur->device; 1068 for (i = 0; i < 4; i++) 1069 slot_cur->func->irq[i] = slot_cur->irq[i]; 1070 1071 debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n", 1072 slot_cur->bus, slot_cur->device); 1073 1074 if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) { 1075 err("configure_card was unsuccessful...\n"); 1076 /* true because don't need to actually deallocate resources, 1077 * just remove references */ 1078 ibmphp_unconfigure_card(&slot_cur, 1); 1079 debug("after unconfigure_card\n"); 1080 slot_cur->func = NULL; 1081 rc = -ENOMEM; 1082 goto error_power; 1083 } 1084 1085 function = 0x00; 1086 do { 1087 tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device, 1088 function++); 1089 if (tmp_func && !(tmp_func->dev)) 1090 ibm_configure_device(tmp_func); 1091 } while (tmp_func); 1092 1093 attn_off(slot_cur); 1094 if (slot_update(&slot_cur)) { 1095 rc = -EFAULT; 1096 goto exit; 1097 } 1098 ibmphp_print_test(); 1099 rc = ibmphp_update_slot_info(slot_cur); 1100 exit: 1101 ibmphp_unlock_operations(); 1102 return rc; 1103 1104 error_nopower: 1105 attn_off(slot_cur); /* need to turn off if was blinking b4 */ 1106 attn_on(slot_cur); 1107 error_cont: 1108 rcpr = slot_update(&slot_cur); 1109 if (rcpr) { 1110 rc = rcpr; 1111 goto exit; 1112 } 1113 ibmphp_update_slot_info(slot_cur); 1114 goto exit; 1115 1116 error_power: 1117 attn_off(slot_cur); /* need to turn off if was blinking b4 */ 1118 attn_on(slot_cur); 1119 rcpr = power_off(slot_cur); 1120 if (rcpr) { 1121 rc = rcpr; 1122 goto exit; 1123 } 1124 goto error_cont; 1125 } 1126 1127 /************************************************************** 1128 * HOT REMOVING ADAPTER CARD * 1129 * INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE * 1130 * OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE * 1131 * DISABLE POWER , * 1132 **************************************************************/ 1133 static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot) 1134 { 1135 struct slot *slot = to_slot(hotplug_slot); 1136 int rc; 1137 1138 ibmphp_lock_operations(); 1139 rc = ibmphp_do_disable_slot(slot); 1140 ibmphp_unlock_operations(); 1141 return rc; 1142 } 1143 1144 int ibmphp_do_disable_slot(struct slot *slot_cur) 1145 { 1146 int rc; 1147 u8 flag; 1148 1149 debug("DISABLING SLOT...\n"); 1150 1151 if ((slot_cur == NULL) || (slot_cur->ctrl == NULL)) 1152 return -ENODEV; 1153 1154 flag = slot_cur->flag; 1155 slot_cur->flag = 1; 1156 1157 if (flag == 1) { 1158 rc = validate(slot_cur, DISABLE); 1159 /* checking if powered off already & valid slot # */ 1160 if (rc) 1161 goto error; 1162 } 1163 attn_LED_blink(slot_cur); 1164 1165 if (slot_cur->func == NULL) { 1166 /* We need this for functions that were there on bootup */ 1167 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL); 1168 if (!slot_cur->func) { 1169 rc = -ENOMEM; 1170 goto error; 1171 } 1172 slot_cur->func->busno = slot_cur->bus; 1173 slot_cur->func->device = slot_cur->device; 1174 } 1175 1176 ibm_unconfigure_device(slot_cur->func); 1177 1178 /* 1179 * If we got here from latch suddenly opening on operating card or 1180 * a power fault, there's no power to the card, so cannot 1181 * read from it to determine what resources it occupied. This operation 1182 * is forbidden anyhow. The best we can do is remove it from kernel 1183 * lists at least */ 1184 1185 if (!flag) { 1186 attn_off(slot_cur); 1187 return 0; 1188 } 1189 1190 rc = ibmphp_unconfigure_card(&slot_cur, 0); 1191 slot_cur->func = NULL; 1192 debug("in disable_slot. after unconfigure_card\n"); 1193 if (rc) { 1194 err("could not unconfigure card.\n"); 1195 goto error; 1196 } 1197 1198 rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF); 1199 if (rc) 1200 goto error; 1201 1202 attn_off(slot_cur); 1203 rc = slot_update(&slot_cur); 1204 if (rc) 1205 goto exit; 1206 1207 rc = ibmphp_update_slot_info(slot_cur); 1208 ibmphp_print_test(); 1209 exit: 1210 return rc; 1211 1212 error: 1213 /* Need to turn off if was blinking b4 */ 1214 attn_off(slot_cur); 1215 attn_on(slot_cur); 1216 if (slot_update(&slot_cur)) { 1217 rc = -EFAULT; 1218 goto exit; 1219 } 1220 if (flag) 1221 ibmphp_update_slot_info(slot_cur); 1222 goto exit; 1223 } 1224 1225 const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = { 1226 .set_attention_status = set_attention_status, 1227 .enable_slot = enable_slot, 1228 .disable_slot = ibmphp_disable_slot, 1229 .hardware_test = NULL, 1230 .get_power_status = get_power_status, 1231 .get_attention_status = get_attention_status, 1232 .get_latch_status = get_latch_status, 1233 .get_adapter_status = get_adapter_present, 1234 /* .get_max_adapter_speed = get_max_adapter_speed, 1235 .get_bus_name_status = get_bus_name, 1236 */ 1237 }; 1238 1239 static void ibmphp_unload(void) 1240 { 1241 free_slots(); 1242 debug("after slots\n"); 1243 ibmphp_free_resources(); 1244 debug("after resources\n"); 1245 ibmphp_free_bus_info_queue(); 1246 debug("after bus info\n"); 1247 ibmphp_free_ebda_hpc_queue(); 1248 debug("after ebda hpc\n"); 1249 ibmphp_free_ebda_pci_rsrc_queue(); 1250 debug("after ebda pci rsrc\n"); 1251 kfree(ibmphp_pci_bus); 1252 } 1253 1254 static int __init ibmphp_init(void) 1255 { 1256 struct pci_bus *bus; 1257 int i = 0; 1258 int rc = 0; 1259 1260 init_flag = 1; 1261 1262 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 1263 1264 ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL); 1265 if (!ibmphp_pci_bus) { 1266 rc = -ENOMEM; 1267 goto exit; 1268 } 1269 1270 bus = pci_find_bus(0, 0); 1271 if (!bus) { 1272 err("Can't find the root pci bus, can not continue\n"); 1273 rc = -ENODEV; 1274 goto error; 1275 } 1276 memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus)); 1277 1278 ibmphp_debug = debug; 1279 1280 for (i = 0; i < 16; i++) 1281 irqs[i] = 0; 1282 1283 rc = ibmphp_access_ebda(); 1284 if (rc) 1285 goto error; 1286 debug("after ibmphp_access_ebda()\n"); 1287 1288 rc = ibmphp_rsrc_init(); 1289 if (rc) 1290 goto error; 1291 debug("AFTER Resource & EBDA INITIALIZATIONS\n"); 1292 1293 max_slots = get_max_slots(); 1294 1295 rc = ibmphp_register_pci(); 1296 if (rc) 1297 goto error; 1298 1299 if (init_ops()) { 1300 rc = -ENODEV; 1301 goto error; 1302 } 1303 1304 ibmphp_print_test(); 1305 rc = ibmphp_hpc_start_poll_thread(); 1306 if (rc) 1307 goto error; 1308 1309 exit: 1310 return rc; 1311 1312 error: 1313 ibmphp_unload(); 1314 goto exit; 1315 } 1316 1317 static void __exit ibmphp_exit(void) 1318 { 1319 ibmphp_hpc_stop_poll_thread(); 1320 debug("after polling\n"); 1321 ibmphp_unload(); 1322 debug("done\n"); 1323 } 1324 1325 module_init(ibmphp_init); 1326 module_exit(ibmphp_exit); 1327