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_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 69 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 70 71 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 72 .owner = THIS_MODULE, 73 .set_attention_status = set_attention_status, 74 .enable_slot = enable_slot, 75 .disable_slot = disable_slot, 76 .get_power_status = get_power_status, 77 .get_attention_status = get_attention_status, 78 .get_latch_status = get_latch_status, 79 .get_adapter_status = get_adapter_status, 80 .get_max_bus_speed = get_max_bus_speed, 81 .get_cur_bus_speed = get_cur_bus_speed, 82 }; 83 84 /** 85 * release_slot - free up the memory used by a slot 86 * @hotplug_slot: slot to free 87 */ 88 static void release_slot(struct hotplug_slot *hotplug_slot) 89 { 90 struct slot *slot = hotplug_slot->private; 91 92 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 93 94 kfree(slot->hotplug_slot->info); 95 kfree(slot->hotplug_slot->name); 96 kfree(slot->hotplug_slot); 97 kfree(slot); 98 } 99 100 static int init_slots(struct controller *ctrl) 101 { 102 struct slot *new_slot; 103 u8 number_of_slots; 104 u8 slot_device; 105 u32 slot_number, sun; 106 int result = -ENOMEM; 107 108 number_of_slots = ctrl->num_slots; 109 slot_device = ctrl->slot_device_offset; 110 slot_number = ctrl->first_slot; 111 112 while (number_of_slots) { 113 new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL); 114 if (!new_slot) 115 goto error; 116 117 memset(new_slot, 0, sizeof(struct slot)); 118 new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL); 119 if (!new_slot->hotplug_slot) 120 goto error_slot; 121 memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot)); 122 123 new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL); 124 if (!new_slot->hotplug_slot->info) 125 goto error_hpslot; 126 memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info)); 127 new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL); 128 if (!new_slot->hotplug_slot->name) 129 goto error_info; 130 131 new_slot->magic = SLOT_MAGIC; 132 new_slot->ctrl = ctrl; 133 new_slot->bus = ctrl->slot_bus; 134 new_slot->device = slot_device; 135 new_slot->hpc_ops = ctrl->hpc_ops; 136 137 if (shpchprm_get_physical_slot_number(ctrl, &sun, 138 new_slot->bus, new_slot->device)) 139 goto error_name; 140 141 new_slot->number = sun; 142 new_slot->hp_slot = slot_device - ctrl->slot_device_offset; 143 144 /* register this slot with the hotplug pci core */ 145 new_slot->hotplug_slot->private = new_slot; 146 new_slot->hotplug_slot->release = &release_slot; 147 make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot); 148 new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops; 149 150 new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status)); 151 new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status)); 152 new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status)); 153 new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status)); 154 155 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus, 156 new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset); 157 result = pci_hp_register (new_slot->hotplug_slot); 158 if (result) { 159 err ("pci_hp_register failed with error %d\n", result); 160 goto error_name; 161 } 162 163 new_slot->next = ctrl->slot; 164 ctrl->slot = new_slot; 165 166 number_of_slots--; 167 slot_device++; 168 slot_number += ctrl->slot_num_inc; 169 } 170 171 return 0; 172 173 error_name: 174 kfree(new_slot->hotplug_slot->name); 175 error_info: 176 kfree(new_slot->hotplug_slot->info); 177 error_hpslot: 178 kfree(new_slot->hotplug_slot); 179 error_slot: 180 kfree(new_slot); 181 error: 182 return result; 183 } 184 185 static void cleanup_slots(struct controller *ctrl) 186 { 187 struct slot *old_slot, *next_slot; 188 189 old_slot = ctrl->slot; 190 ctrl->slot = NULL; 191 192 while (old_slot) { 193 next_slot = old_slot->next; 194 pci_hp_deregister(old_slot->hotplug_slot); 195 old_slot = next_slot; 196 } 197 } 198 199 static int get_ctlr_slot_config(struct controller *ctrl) 200 { 201 int num_ctlr_slots; 202 int first_device_num; 203 int physical_slot_num; 204 int updown; 205 int rc; 206 int flags; 207 208 rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags); 209 if (rc) { 210 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device); 211 return -1; 212 } 213 214 ctrl->num_slots = num_ctlr_slots; 215 ctrl->slot_device_offset = first_device_num; 216 ctrl->first_slot = physical_slot_num; 217 ctrl->slot_num_inc = updown; /* either -1 or 1 */ 218 219 dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n", 220 __FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device); 221 222 return 0; 223 } 224 225 226 /* 227 * set_attention_status - Turns the Amber LED for a slot on, off or blink 228 */ 229 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 230 { 231 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 232 233 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 234 235 hotplug_slot->info->attention_status = status; 236 slot->hpc_ops->set_attention_status(slot, status); 237 238 return 0; 239 } 240 241 242 static int enable_slot (struct hotplug_slot *hotplug_slot) 243 { 244 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 245 246 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 247 248 return shpchp_enable_slot(slot); 249 } 250 251 252 static int disable_slot (struct hotplug_slot *hotplug_slot) 253 { 254 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 255 256 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 257 258 return shpchp_disable_slot(slot); 259 } 260 261 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 262 { 263 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 264 int retval; 265 266 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 267 268 retval = slot->hpc_ops->get_power_status(slot, value); 269 if (retval < 0) 270 *value = hotplug_slot->info->power_status; 271 272 return 0; 273 } 274 275 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 276 { 277 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 278 int retval; 279 280 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 281 282 retval = slot->hpc_ops->get_attention_status(slot, value); 283 if (retval < 0) 284 *value = hotplug_slot->info->attention_status; 285 286 return 0; 287 } 288 289 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 290 { 291 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 292 int retval; 293 294 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 295 296 retval = slot->hpc_ops->get_latch_status(slot, value); 297 if (retval < 0) 298 *value = hotplug_slot->info->latch_status; 299 300 return 0; 301 } 302 303 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 304 { 305 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 306 int retval; 307 308 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 309 310 retval = slot->hpc_ops->get_adapter_status(slot, value); 311 if (retval < 0) 312 *value = hotplug_slot->info->adapter_status; 313 314 return 0; 315 } 316 317 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 318 { 319 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__); 320 int retval; 321 322 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 323 324 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 325 if (retval < 0) 326 *value = PCI_SPEED_UNKNOWN; 327 328 return 0; 329 } 330 331 static int get_cur_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_cur_bus_speed(slot, value); 339 if (retval < 0) 340 *value = PCI_SPEED_UNKNOWN; 341 342 return 0; 343 } 344 345 static int is_shpc_capable(struct pci_dev *dev) 346 { 347 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 348 PCI_DEVICE_ID_AMD_GOLAM_7450)) 349 return 1; 350 if (pci_find_capability(dev, PCI_CAP_ID_SHPC)) 351 return 1; 352 353 return 0; 354 } 355 356 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 357 { 358 int rc; 359 struct controller *ctrl; 360 struct slot *t_slot; 361 int first_device_num; /* first PCI device number supported by this SHPC */ 362 int num_ctlr_slots; /* number of slots supported by this SHPC */ 363 364 if (!is_shpc_capable(pdev)) 365 return -ENODEV; 366 367 ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL); 368 if (!ctrl) { 369 err("%s : out of memory\n", __FUNCTION__); 370 goto err_out_none; 371 } 372 memset(ctrl, 0, sizeof(struct controller)); 373 374 rc = shpc_init(ctrl, pdev); 375 if (rc) { 376 dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME); 377 goto err_out_free_ctrl; 378 } 379 380 ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */ 381 382 pci_set_drvdata(pdev, ctrl); 383 384 ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL); 385 if (!ctrl->pci_bus) { 386 err("out of memory\n"); 387 rc = -ENOMEM; 388 goto err_out_unmap_mmio_region; 389 } 390 391 memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus)); 392 ctrl->bus = pdev->bus->number; 393 ctrl->slot_bus = pdev->subordinate->number; 394 395 ctrl->device = PCI_SLOT(pdev->devfn); 396 ctrl->function = PCI_FUNC(pdev->devfn); 397 dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq); 398 399 /* 400 * Save configuration headers for this and subordinate PCI buses 401 */ 402 403 rc = get_ctlr_slot_config(ctrl); 404 if (rc) { 405 err(msg_initialization_err, rc); 406 goto err_out_free_ctrl_bus; 407 } 408 first_device_num = ctrl->slot_device_offset; 409 num_ctlr_slots = ctrl->num_slots; 410 411 ctrl->add_support = 1; 412 413 /* Setup the slot information structures */ 414 rc = init_slots(ctrl); 415 if (rc) { 416 err(msg_initialization_err, 6); 417 goto err_out_free_ctrl_slot; 418 } 419 420 /* Now hpc_functions (slot->hpc_ops->functions) are ready */ 421 t_slot = shpchp_find_slot(ctrl, first_device_num); 422 423 /* Check for operation bus speed */ 424 rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed); 425 dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot); 426 427 if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) { 428 err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n"); 429 ctrl->speed = PCI_SPEED_33MHz; 430 } 431 432 /* Finish setting up the hot plug ctrl device */ 433 ctrl->next_event = 0; 434 435 if (!shpchp_ctrl_list) { 436 shpchp_ctrl_list = ctrl; 437 ctrl->next = NULL; 438 } else { 439 ctrl->next = shpchp_ctrl_list; 440 shpchp_ctrl_list = ctrl; 441 } 442 443 shpchp_create_ctrl_files(ctrl); 444 445 return 0; 446 447 err_out_free_ctrl_slot: 448 cleanup_slots(ctrl); 449 err_out_free_ctrl_bus: 450 kfree(ctrl->pci_bus); 451 err_out_unmap_mmio_region: 452 ctrl->hpc_ops->release_ctlr(ctrl); 453 err_out_free_ctrl: 454 kfree(ctrl); 455 err_out_none: 456 return -ENODEV; 457 } 458 459 460 static int shpc_start_thread(void) 461 { 462 int retval = 0; 463 464 dbg("Initialize + Start the notification/polling mechanism \n"); 465 466 retval = shpchp_event_start_thread(); 467 if (retval) { 468 dbg("shpchp_event_start_thread() failed\n"); 469 return retval; 470 } 471 472 return retval; 473 } 474 475 static void __exit unload_shpchpd(void) 476 { 477 struct controller *ctrl; 478 struct controller *tctrl; 479 480 ctrl = shpchp_ctrl_list; 481 482 while (ctrl) { 483 shpchp_remove_ctrl_files(ctrl); 484 cleanup_slots(ctrl); 485 486 kfree (ctrl->pci_bus); 487 ctrl->hpc_ops->release_ctlr(ctrl); 488 489 tctrl = ctrl; 490 ctrl = ctrl->next; 491 492 kfree(tctrl); 493 } 494 495 /* Stop the notification mechanism */ 496 shpchp_event_stop_thread(); 497 498 } 499 500 501 static struct pci_device_id shpcd_pci_tbl[] = { 502 { 503 .class = ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), 504 .class_mask = ~0, 505 .vendor = PCI_ANY_ID, 506 .device = PCI_ANY_ID, 507 .subvendor = PCI_ANY_ID, 508 .subdevice = PCI_ANY_ID, 509 }, 510 511 { /* end: all zeroes */ } 512 }; 513 514 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 515 516 517 518 static struct pci_driver shpc_driver = { 519 .name = SHPC_MODULE_NAME, 520 .id_table = shpcd_pci_tbl, 521 .probe = shpc_probe, 522 /* remove: shpc_remove_one, */ 523 }; 524 525 526 527 static int __init shpcd_init(void) 528 { 529 int retval = 0; 530 531 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE 532 shpchp_poll_mode = 1; 533 #endif 534 535 retval = shpc_start_thread(); 536 if (retval) 537 goto error_hpc_init; 538 539 retval = pci_register_driver(&shpc_driver); 540 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval); 541 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 542 543 error_hpc_init: 544 if (retval) { 545 shpchp_event_stop_thread(); 546 } 547 return retval; 548 } 549 550 static void __exit shpcd_cleanup(void) 551 { 552 dbg("unload_shpchpd()\n"); 553 unload_shpchpd(); 554 555 pci_unregister_driver(&shpc_driver); 556 557 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 558 } 559 560 module_init(shpcd_init); 561 module_exit(shpcd_cleanup); 562