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 <linux/workqueue.h> 36 #include "shpchp.h" 37 38 /* Global variables */ 39 int shpchp_debug; 40 int shpchp_poll_mode; 41 int shpchp_poll_time; 42 struct workqueue_struct *shpchp_wq; 43 44 #define DRIVER_VERSION "0.4" 45 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" 46 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver" 47 48 MODULE_AUTHOR(DRIVER_AUTHOR); 49 MODULE_DESCRIPTION(DRIVER_DESC); 50 MODULE_LICENSE("GPL"); 51 52 module_param(shpchp_debug, bool, 0644); 53 module_param(shpchp_poll_mode, bool, 0644); 54 module_param(shpchp_poll_time, int, 0644); 55 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 56 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 57 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 58 59 #define SHPC_MODULE_NAME "shpchp" 60 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); 98 kfree(slot); 99 } 100 101 static void make_slot_name(struct slot *slot) 102 { 103 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d", 104 slot->bus, slot->number); 105 } 106 107 108 109 110 static int 111 shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun, 112 u8 busnum, u8 devnum) 113 { 114 int offset = devnum - ctrl->slot_device_offset; 115 116 dbg("%s: ctrl->slot_num_inc %d, offset %d\n", __FUNCTION__, 117 ctrl->slot_num_inc, offset); 118 *sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc *offset); 119 return 0; 120 } 121 122 123 124 static int init_slots(struct controller *ctrl) 125 { 126 struct slot *slot; 127 struct hotplug_slot *hotplug_slot; 128 struct hotplug_slot_info *info; 129 int retval = -ENOMEM; 130 int i; 131 u32 sun; 132 133 for (i = 0; i < ctrl->num_slots; i++) { 134 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 135 if (!slot) 136 goto error; 137 138 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 139 if (!hotplug_slot) 140 goto error_slot; 141 slot->hotplug_slot = hotplug_slot; 142 143 info = kzalloc(sizeof(*info), GFP_KERNEL); 144 if (!info) 145 goto error_hpslot; 146 hotplug_slot->info = info; 147 148 hotplug_slot->name = slot->name; 149 150 slot->hp_slot = i; 151 slot->ctrl = ctrl; 152 slot->bus = ctrl->slot_bus; 153 slot->device = ctrl->slot_device_offset + i; 154 slot->hpc_ops = ctrl->hpc_ops; 155 mutex_init(&slot->lock); 156 157 if (shpchprm_get_physical_slot_number(ctrl, &sun, 158 slot->bus, slot->device)) 159 goto error_info; 160 161 slot->number = sun; 162 INIT_WORK(&slot->work, queue_pushbutton_work, slot); 163 164 /* register this slot with the hotplug pci core */ 165 hotplug_slot->private = slot; 166 hotplug_slot->release = &release_slot; 167 make_slot_name(slot); 168 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 169 170 get_power_status(hotplug_slot, &info->power_status); 171 get_attention_status(hotplug_slot, &info->attention_status); 172 get_latch_status(hotplug_slot, &info->latch_status); 173 get_adapter_status(hotplug_slot, &info->adapter_status); 174 175 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " 176 "slot_device_offset=%x\n", slot->bus, slot->device, 177 slot->hp_slot, slot->number, ctrl->slot_device_offset); 178 retval = pci_hp_register(slot->hotplug_slot); 179 if (retval) { 180 err("pci_hp_register failed with error %d\n", retval); 181 goto error_info; 182 } 183 184 list_add(&slot->slot_list, &ctrl->slot_list); 185 } 186 187 return 0; 188 error_info: 189 kfree(info); 190 error_hpslot: 191 kfree(hotplug_slot); 192 error_slot: 193 kfree(slot); 194 error: 195 return retval; 196 } 197 198 void cleanup_slots(struct controller *ctrl) 199 { 200 struct list_head *tmp; 201 struct list_head *next; 202 struct slot *slot; 203 204 list_for_each_safe(tmp, next, &ctrl->slot_list) { 205 slot = list_entry(tmp, struct slot, slot_list); 206 list_del(&slot->slot_list); 207 cancel_delayed_work(&slot->work); 208 flush_scheduled_work(); 209 flush_workqueue(shpchp_wq); 210 pci_hp_deregister(slot->hotplug_slot); 211 } 212 } 213 214 static int get_ctlr_slot_config(struct controller *ctrl) 215 { 216 int num_ctlr_slots; 217 int first_device_num; 218 int physical_slot_num; 219 int updown; 220 int rc; 221 int flags; 222 223 rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, 224 &first_device_num, &physical_slot_num, 225 &updown, &flags); 226 if (rc) { 227 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", 228 __FUNCTION__, ctrl->bus, ctrl->device); 229 return -1; 230 } 231 232 ctrl->num_slots = num_ctlr_slots; 233 ctrl->slot_device_offset = first_device_num; 234 ctrl->first_slot = physical_slot_num; 235 ctrl->slot_num_inc = updown; /* either -1 or 1 */ 236 237 dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d " 238 "(%x:%x)\n", __FUNCTION__, num_ctlr_slots, first_device_num, 239 physical_slot_num, updown, ctrl->bus, ctrl->device); 240 241 return 0; 242 } 243 244 /* 245 * set_attention_status - Turns the Amber LED for a slot on, off or blink 246 */ 247 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 248 { 249 struct slot *slot = get_slot(hotplug_slot, __FUNCTION__); 250 251 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 252 253 hotplug_slot->info->attention_status = status; 254 slot->hpc_ops->set_attention_status(slot, status); 255 256 return 0; 257 } 258 259 static int enable_slot (struct hotplug_slot *hotplug_slot) 260 { 261 struct slot *slot = get_slot(hotplug_slot, __FUNCTION__); 262 263 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 264 265 return shpchp_sysfs_enable_slot(slot); 266 } 267 268 static int disable_slot (struct hotplug_slot *hotplug_slot) 269 { 270 struct slot *slot = get_slot(hotplug_slot, __FUNCTION__); 271 272 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 273 274 return shpchp_sysfs_disable_slot(slot); 275 } 276 277 static int get_power_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_power_status(slot, value); 285 if (retval < 0) 286 *value = hotplug_slot->info->power_status; 287 288 return 0; 289 } 290 291 static int get_attention_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_attention_status(slot, value); 299 if (retval < 0) 300 *value = hotplug_slot->info->attention_status; 301 302 return 0; 303 } 304 305 static int get_latch_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_latch_status(slot, value); 313 if (retval < 0) 314 *value = hotplug_slot->info->latch_status; 315 316 return 0; 317 } 318 319 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 320 { 321 struct slot *slot = get_slot(hotplug_slot, __FUNCTION__); 322 int retval; 323 324 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 325 326 retval = slot->hpc_ops->get_adapter_status(slot, value); 327 if (retval < 0) 328 *value = hotplug_slot->info->adapter_status; 329 330 return 0; 331 } 332 333 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value) 334 { 335 struct slot *slot = get_slot(hotplug_slot, __FUNCTION__); 336 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate; 337 338 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 339 340 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device; 341 342 return 0; 343 } 344 345 static int get_max_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_max_bus_speed(slot, value); 353 if (retval < 0) 354 *value = PCI_SPEED_UNKNOWN; 355 356 return 0; 357 } 358 359 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 360 { 361 struct slot *slot = get_slot(hotplug_slot, __FUNCTION__); 362 int retval; 363 364 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 365 366 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 367 if (retval < 0) 368 *value = PCI_SPEED_UNKNOWN; 369 370 return 0; 371 } 372 373 static int is_shpc_capable(struct pci_dev *dev) 374 { 375 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 376 PCI_DEVICE_ID_AMD_GOLAM_7450)) 377 return 1; 378 if (pci_find_capability(dev, PCI_CAP_ID_SHPC)) 379 return 1; 380 381 return 0; 382 } 383 384 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 385 { 386 int rc; 387 struct controller *ctrl; 388 struct slot *t_slot; 389 int first_device_num; /* first PCI device number */ 390 int num_ctlr_slots; /* number of slots implemented */ 391 392 if (!is_shpc_capable(pdev)) 393 return -ENODEV; 394 395 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 396 if (!ctrl) { 397 err("%s : out of memory\n", __FUNCTION__); 398 goto err_out_none; 399 } 400 INIT_LIST_HEAD(&ctrl->slot_list); 401 402 rc = shpc_init(ctrl, pdev); 403 if (rc) { 404 dbg("%s: controller initialization failed\n", 405 SHPC_MODULE_NAME); 406 goto err_out_free_ctrl; 407 } 408 409 pci_set_drvdata(pdev, ctrl); 410 411 ctrl->bus = pdev->bus->number; 412 ctrl->slot_bus = pdev->subordinate->number; 413 ctrl->device = PCI_SLOT(pdev->devfn); 414 ctrl->function = PCI_FUNC(pdev->devfn); 415 416 dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", 417 ctrl->bus, ctrl->device, ctrl->function, pdev->irq); 418 419 /* 420 * Save configuration headers for this and subordinate PCI buses 421 */ 422 rc = get_ctlr_slot_config(ctrl); 423 if (rc) { 424 err(msg_initialization_err, rc); 425 goto err_out_release_ctlr; 426 } 427 first_device_num = ctrl->slot_device_offset; 428 num_ctlr_slots = ctrl->num_slots; 429 430 ctrl->add_support = 1; 431 432 /* Setup the slot information structures */ 433 rc = init_slots(ctrl); 434 if (rc) { 435 err(msg_initialization_err, 6); 436 goto err_out_release_ctlr; 437 } 438 439 /* Now hpc_functions (slot->hpc_ops->functions) are ready */ 440 t_slot = shpchp_find_slot(ctrl, first_device_num); 441 442 /* Check for operation bus speed */ 443 rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed); 444 dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot); 445 446 if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) { 447 err(SHPC_MODULE_NAME ": Can't get current bus speed. " 448 "Set to 33MHz PCI.\n"); 449 ctrl->speed = PCI_SPEED_33MHz; 450 } 451 452 shpchp_create_ctrl_files(ctrl); 453 454 return 0; 455 456 err_out_release_ctlr: 457 ctrl->hpc_ops->release_ctlr(ctrl); 458 err_out_free_ctrl: 459 kfree(ctrl); 460 err_out_none: 461 return -ENODEV; 462 } 463 464 static void shpc_remove(struct pci_dev *dev) 465 { 466 struct controller *ctrl = pci_get_drvdata(dev); 467 468 shpchp_remove_ctrl_files(ctrl); 469 ctrl->hpc_ops->release_ctlr(ctrl); 470 kfree(ctrl); 471 } 472 473 static struct pci_device_id shpcd_pci_tbl[] = { 474 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 475 { /* end: all zeroes */ } 476 }; 477 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 478 479 static struct pci_driver shpc_driver = { 480 .name = SHPC_MODULE_NAME, 481 .id_table = shpcd_pci_tbl, 482 .probe = shpc_probe, 483 .remove = shpc_remove, 484 }; 485 486 static int __init shpcd_init(void) 487 { 488 int retval = 0; 489 490 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE 491 shpchp_poll_mode = 1; 492 #endif 493 494 shpchp_wq = create_singlethread_workqueue("shpchpd"); 495 if (!shpchp_wq) 496 return -ENOMEM; 497 498 retval = pci_register_driver(&shpc_driver); 499 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval); 500 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 501 if (retval) { 502 destroy_workqueue(shpchp_wq); 503 } 504 return retval; 505 } 506 507 static void __exit shpcd_cleanup(void) 508 { 509 dbg("unload_shpchpd()\n"); 510 pci_unregister_driver(&shpc_driver); 511 destroy_workqueue(shpchp_wq); 512 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 513 } 514 515 module_init(shpcd_init); 516 module_exit(shpcd_cleanup); 517