1 /* 2 * Standard 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/moduleparam.h> 32 #include <linux/kernel.h> 33 #include <linux/types.h> 34 #include <linux/pci.h> 35 #include "shpchp.h" 36 37 /* Global variables */ 38 int shpchp_debug; 39 int shpchp_poll_mode; 40 int shpchp_poll_time; 41 struct controller *shpchp_ctrl_list; /* = NULL */ 42 43 #define DRIVER_VERSION "0.4" 44 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" 45 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver" 46 47 MODULE_AUTHOR(DRIVER_AUTHOR); 48 MODULE_DESCRIPTION(DRIVER_DESC); 49 MODULE_LICENSE("GPL"); 50 51 module_param(shpchp_debug, bool, 0644); 52 module_param(shpchp_poll_mode, bool, 0644); 53 module_param(shpchp_poll_time, int, 0644); 54 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 55 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 56 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 57 58 #define SHPC_MODULE_NAME "shpchp" 59 60 static int shpc_start_thread (void); 61 static int set_attention_status (struct hotplug_slot *slot, u8 value); 62 static int enable_slot (struct hotplug_slot *slot); 63 static int disable_slot (struct hotplug_slot *slot); 64 static int get_power_status (struct hotplug_slot *slot, u8 *value); 65 static int get_attention_status (struct hotplug_slot *slot, u8 *value); 66 static int get_latch_status (struct hotplug_slot *slot, u8 *value); 67 static int get_adapter_status (struct hotplug_slot *slot, u8 *value); 68 static int get_address (struct hotplug_slot *slot, u32 *value); 69 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 70 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 71 72 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 73 .owner = THIS_MODULE, 74 .set_attention_status = set_attention_status, 75 .enable_slot = enable_slot, 76 .disable_slot = disable_slot, 77 .get_power_status = get_power_status, 78 .get_attention_status = get_attention_status, 79 .get_latch_status = get_latch_status, 80 .get_adapter_status = get_adapter_status, 81 .get_address = get_address, 82 .get_max_bus_speed = get_max_bus_speed, 83 .get_cur_bus_speed = get_cur_bus_speed, 84 }; 85 86 /** 87 * release_slot - free up the memory used by a slot 88 * @hotplug_slot: slot to free 89 */ 90 static void release_slot(struct hotplug_slot *hotplug_slot) 91 { 92 struct slot *slot = hotplug_slot->private; 93 94 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 95 96 kfree(slot->hotplug_slot->info); 97 kfree(slot->hotplug_slot->name); 98 kfree(slot->hotplug_slot); 99 kfree(slot); 100 } 101 102 static int init_slots(struct controller *ctrl) 103 { 104 struct slot *new_slot; 105 u8 number_of_slots; 106 u8 slot_device; 107 u32 slot_number, sun; 108 int result = -ENOMEM; 109 110 number_of_slots = ctrl->num_slots; 111 slot_device = ctrl->slot_device_offset; 112 slot_number = ctrl->first_slot; 113 114 while (number_of_slots) { 115 new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL); 116 if (!new_slot) 117 goto error; 118 119 memset(new_slot, 0, sizeof(struct slot)); 120 new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL); 121 if (!new_slot->hotplug_slot) 122 goto error_slot; 123 memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot)); 124 125 new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL); 126 if (!new_slot->hotplug_slot->info) 127 goto error_hpslot; 128 memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info)); 129 new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL); 130 if (!new_slot->hotplug_slot->name) 131 goto error_info; 132 133 new_slot->magic = SLOT_MAGIC; 134 new_slot->ctrl = ctrl; 135 new_slot->bus = ctrl->slot_bus; 136 new_slot->device = slot_device; 137 new_slot->hpc_ops = ctrl->hpc_ops; 138 139 if (shpchprm_get_physical_slot_number(ctrl, &sun, 140 new_slot->bus, new_slot->device)) 141 goto error_name; 142 143 new_slot->number = sun; 144 new_slot->hp_slot = slot_device - ctrl->slot_device_offset; 145 146 /* register this slot with the hotplug pci core */ 147 new_slot->hotplug_slot->private = new_slot; 148 new_slot->hotplug_slot->release = &release_slot; 149 make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot); 150 new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops; 151 152 new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status)); 153 new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status)); 154 new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status)); 155 new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status)); 156 157 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus, 158 new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset); 159 result = pci_hp_register (new_slot->hotplug_slot); 160 if (result) { 161 err ("pci_hp_register failed with error %d\n", result); 162 goto error_name; 163 } 164 165 new_slot->next = ctrl->slot; 166 ctrl->slot = new_slot; 167 168 number_of_slots--; 169 slot_device++; 170 slot_number += ctrl->slot_num_inc; 171 } 172 173 return 0; 174 175 error_name: 176 kfree(new_slot->hotplug_slot->name); 177 error_info: 178 kfree(new_slot->hotplug_slot->info); 179 error_hpslot: 180 kfree(new_slot->hotplug_slot); 181 error_slot: 182 kfree(new_slot); 183 error: 184 return result; 185 } 186 187 static void cleanup_slots(struct controller *ctrl) 188 { 189 struct slot *old_slot, *next_slot; 190 191 old_slot = ctrl->slot; 192 ctrl->slot = NULL; 193 194 while (old_slot) { 195 next_slot = old_slot->next; 196 pci_hp_deregister(old_slot->hotplug_slot); 197 old_slot = next_slot; 198 } 199 } 200 201 static int get_ctlr_slot_config(struct controller *ctrl) 202 { 203 int num_ctlr_slots; 204 int first_device_num; 205 int physical_slot_num; 206 int updown; 207 int rc; 208 int flags; 209 210 rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags); 211 if (rc) { 212 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device); 213 return -1; 214 } 215 216 ctrl->num_slots = num_ctlr_slots; 217 ctrl->slot_device_offset = first_device_num; 218 ctrl->first_slot = physical_slot_num; 219 ctrl->slot_num_inc = updown; /* either -1 or 1 */ 220 221 dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n", 222 __FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device); 223 224 return 0; 225 } 226 227 228 /* 229 * set_attention_status - Turns the Amber LED for a slot on, off or blink 230 */ 231 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 232 { 233 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 234 235 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 236 237 hotplug_slot->info->attention_status = status; 238 slot->hpc_ops->set_attention_status(slot, status); 239 240 return 0; 241 } 242 243 244 static int enable_slot (struct hotplug_slot *hotplug_slot) 245 { 246 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 247 248 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 249 250 return shpchp_enable_slot(slot); 251 } 252 253 254 static int disable_slot (struct hotplug_slot *hotplug_slot) 255 { 256 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 257 258 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 259 260 return shpchp_disable_slot(slot); 261 } 262 263 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 264 { 265 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 266 int retval; 267 268 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 269 270 retval = slot->hpc_ops->get_power_status(slot, value); 271 if (retval < 0) 272 *value = hotplug_slot->info->power_status; 273 274 return 0; 275 } 276 277 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 278 { 279 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 280 int retval; 281 282 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 283 284 retval = slot->hpc_ops->get_attention_status(slot, value); 285 if (retval < 0) 286 *value = hotplug_slot->info->attention_status; 287 288 return 0; 289 } 290 291 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 292 { 293 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 294 int retval; 295 296 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 297 298 retval = slot->hpc_ops->get_latch_status(slot, value); 299 if (retval < 0) 300 *value = hotplug_slot->info->latch_status; 301 302 return 0; 303 } 304 305 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 306 { 307 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 308 int retval; 309 310 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 311 312 retval = slot->hpc_ops->get_adapter_status(slot, value); 313 if (retval < 0) 314 *value = hotplug_slot->info->adapter_status; 315 316 return 0; 317 } 318 319 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value) 320 { 321 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 322 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate; 323 324 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 325 326 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device; 327 328 return 0; 329 } 330 331 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 332 { 333 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 334 int retval; 335 336 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 337 338 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 339 if (retval < 0) 340 *value = PCI_SPEED_UNKNOWN; 341 342 return 0; 343 } 344 345 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 346 { 347 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 348 int retval; 349 350 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 351 352 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 353 if (retval < 0) 354 *value = PCI_SPEED_UNKNOWN; 355 356 return 0; 357 } 358 359 static int is_shpc_capable(struct pci_dev *dev) 360 { 361 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 362 PCI_DEVICE_ID_AMD_GOLAM_7450)) 363 return 1; 364 if (pci_find_capability(dev, PCI_CAP_ID_SHPC)) 365 return 1; 366 367 return 0; 368 } 369 370 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 371 { 372 int rc; 373 struct controller *ctrl; 374 struct slot *t_slot; 375 int first_device_num; /* first PCI device number supported by this SHPC */ 376 int num_ctlr_slots; /* number of slots supported by this SHPC */ 377 378 if (!is_shpc_capable(pdev)) 379 return -ENODEV; 380 381 ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL); 382 if (!ctrl) { 383 err("%s : out of memory\n", __FUNCTION__); 384 goto err_out_none; 385 } 386 memset(ctrl, 0, sizeof(struct controller)); 387 388 rc = shpc_init(ctrl, pdev); 389 if (rc) { 390 dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME); 391 goto err_out_free_ctrl; 392 } 393 394 pci_set_drvdata(pdev, ctrl); 395 396 ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL); 397 if (!ctrl->pci_bus) { 398 err("out of memory\n"); 399 rc = -ENOMEM; 400 goto err_out_unmap_mmio_region; 401 } 402 403 memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus)); 404 ctrl->bus = pdev->bus->number; 405 ctrl->slot_bus = pdev->subordinate->number; 406 407 ctrl->device = PCI_SLOT(pdev->devfn); 408 ctrl->function = PCI_FUNC(pdev->devfn); 409 dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq); 410 411 /* 412 * Save configuration headers for this and subordinate PCI buses 413 */ 414 415 rc = get_ctlr_slot_config(ctrl); 416 if (rc) { 417 err(msg_initialization_err, rc); 418 goto err_out_free_ctrl_bus; 419 } 420 first_device_num = ctrl->slot_device_offset; 421 num_ctlr_slots = ctrl->num_slots; 422 423 ctrl->add_support = 1; 424 425 /* Setup the slot information structures */ 426 rc = init_slots(ctrl); 427 if (rc) { 428 err(msg_initialization_err, 6); 429 goto err_out_free_ctrl_slot; 430 } 431 432 /* Now hpc_functions (slot->hpc_ops->functions) are ready */ 433 t_slot = shpchp_find_slot(ctrl, first_device_num); 434 435 /* Check for operation bus speed */ 436 rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed); 437 dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot); 438 439 if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) { 440 err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n"); 441 ctrl->speed = PCI_SPEED_33MHz; 442 } 443 444 /* Finish setting up the hot plug ctrl device */ 445 ctrl->next_event = 0; 446 447 if (!shpchp_ctrl_list) { 448 shpchp_ctrl_list = ctrl; 449 ctrl->next = NULL; 450 } else { 451 ctrl->next = shpchp_ctrl_list; 452 shpchp_ctrl_list = ctrl; 453 } 454 455 shpchp_create_ctrl_files(ctrl); 456 457 return 0; 458 459 err_out_free_ctrl_slot: 460 cleanup_slots(ctrl); 461 err_out_free_ctrl_bus: 462 kfree(ctrl->pci_bus); 463 err_out_unmap_mmio_region: 464 ctrl->hpc_ops->release_ctlr(ctrl); 465 err_out_free_ctrl: 466 kfree(ctrl); 467 err_out_none: 468 return -ENODEV; 469 } 470 471 472 static int shpc_start_thread(void) 473 { 474 int retval = 0; 475 476 dbg("Initialize + Start the notification/polling mechanism \n"); 477 478 retval = shpchp_event_start_thread(); 479 if (retval) { 480 dbg("shpchp_event_start_thread() failed\n"); 481 return retval; 482 } 483 484 return retval; 485 } 486 487 static void __exit unload_shpchpd(void) 488 { 489 struct controller *ctrl; 490 struct controller *tctrl; 491 492 ctrl = shpchp_ctrl_list; 493 494 while (ctrl) { 495 shpchp_remove_ctrl_files(ctrl); 496 cleanup_slots(ctrl); 497 498 kfree (ctrl->pci_bus); 499 ctrl->hpc_ops->release_ctlr(ctrl); 500 501 tctrl = ctrl; 502 ctrl = ctrl->next; 503 504 kfree(tctrl); 505 } 506 507 /* Stop the notification mechanism */ 508 shpchp_event_stop_thread(); 509 510 } 511 512 513 static struct pci_device_id shpcd_pci_tbl[] = { 514 { 515 .class = ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), 516 .class_mask = ~0, 517 .vendor = PCI_ANY_ID, 518 .device = PCI_ANY_ID, 519 .subvendor = PCI_ANY_ID, 520 .subdevice = PCI_ANY_ID, 521 }, 522 523 { /* end: all zeroes */ } 524 }; 525 526 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 527 528 529 530 static struct pci_driver shpc_driver = { 531 .name = SHPC_MODULE_NAME, 532 .id_table = shpcd_pci_tbl, 533 .probe = shpc_probe, 534 /* remove: shpc_remove_one, */ 535 }; 536 537 538 539 static int __init shpcd_init(void) 540 { 541 int retval = 0; 542 543 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE 544 shpchp_poll_mode = 1; 545 #endif 546 547 retval = shpc_start_thread(); 548 if (retval) 549 goto error_hpc_init; 550 551 retval = pci_register_driver(&shpc_driver); 552 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval); 553 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 554 555 error_hpc_init: 556 if (retval) { 557 shpchp_event_stop_thread(); 558 } 559 return retval; 560 } 561 562 static void __exit shpcd_cleanup(void) 563 { 564 dbg("unload_shpchpd()\n"); 565 unload_shpchpd(); 566 567 pci_unregister_driver(&shpc_driver); 568 569 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 570 } 571 572 module_init(shpcd_init); 573 module_exit(shpcd_cleanup); 574