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 int shpchp_slot_with_bus; 43 struct workqueue_struct *shpchp_wq; 44 45 #define DRIVER_VERSION "0.4" 46 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" 47 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver" 48 49 MODULE_AUTHOR(DRIVER_AUTHOR); 50 MODULE_DESCRIPTION(DRIVER_DESC); 51 MODULE_LICENSE("GPL"); 52 53 module_param(shpchp_debug, bool, 0644); 54 module_param(shpchp_poll_mode, bool, 0644); 55 module_param(shpchp_poll_time, int, 0644); 56 module_param(shpchp_slot_with_bus, bool, 0644); 57 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 58 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 59 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 60 MODULE_PARM_DESC(shpchp_slot_with_bus, "Use bus number in the slot name"); 61 62 #define SHPC_MODULE_NAME "shpchp" 63 64 static int set_attention_status (struct hotplug_slot *slot, u8 value); 65 static int enable_slot (struct hotplug_slot *slot); 66 static int disable_slot (struct hotplug_slot *slot); 67 static int get_power_status (struct hotplug_slot *slot, u8 *value); 68 static int get_attention_status (struct hotplug_slot *slot, u8 *value); 69 static int get_latch_status (struct hotplug_slot *slot, u8 *value); 70 static int get_adapter_status (struct hotplug_slot *slot, u8 *value); 71 static int get_address (struct hotplug_slot *slot, u32 *value); 72 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 73 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 74 75 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 76 .owner = THIS_MODULE, 77 .set_attention_status = set_attention_status, 78 .enable_slot = enable_slot, 79 .disable_slot = disable_slot, 80 .get_power_status = get_power_status, 81 .get_attention_status = get_attention_status, 82 .get_latch_status = get_latch_status, 83 .get_adapter_status = get_adapter_status, 84 .get_address = get_address, 85 .get_max_bus_speed = get_max_bus_speed, 86 .get_cur_bus_speed = get_cur_bus_speed, 87 }; 88 89 /** 90 * release_slot - free up the memory used by a slot 91 * @hotplug_slot: slot to free 92 */ 93 static void release_slot(struct hotplug_slot *hotplug_slot) 94 { 95 struct slot *slot = hotplug_slot->private; 96 97 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 98 99 kfree(slot->hotplug_slot->info); 100 kfree(slot->hotplug_slot); 101 kfree(slot); 102 } 103 104 static void make_slot_name(struct slot *slot) 105 { 106 if (shpchp_slot_with_bus) 107 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d", 108 slot->bus, slot->number); 109 else 110 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d", 111 slot->number); 112 } 113 114 static int init_slots(struct controller *ctrl) 115 { 116 struct slot *slot; 117 struct hotplug_slot *hotplug_slot; 118 struct hotplug_slot_info *info; 119 int retval = -ENOMEM; 120 int i; 121 122 for (i = 0; i < ctrl->num_slots; i++) { 123 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 124 if (!slot) 125 goto error; 126 127 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 128 if (!hotplug_slot) 129 goto error_slot; 130 slot->hotplug_slot = hotplug_slot; 131 132 info = kzalloc(sizeof(*info), GFP_KERNEL); 133 if (!info) 134 goto error_hpslot; 135 hotplug_slot->info = info; 136 137 hotplug_slot->name = slot->name; 138 139 slot->hp_slot = i; 140 slot->ctrl = ctrl; 141 slot->bus = ctrl->pci_dev->subordinate->number; 142 slot->device = ctrl->slot_device_offset + i; 143 slot->hpc_ops = ctrl->hpc_ops; 144 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 145 mutex_init(&slot->lock); 146 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 147 148 /* register this slot with the hotplug pci core */ 149 hotplug_slot->private = slot; 150 hotplug_slot->release = &release_slot; 151 make_slot_name(slot); 152 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 153 154 get_power_status(hotplug_slot, &info->power_status); 155 get_attention_status(hotplug_slot, &info->attention_status); 156 get_latch_status(hotplug_slot, &info->latch_status); 157 get_adapter_status(hotplug_slot, &info->adapter_status); 158 159 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " 160 "slot_device_offset=%x\n", slot->bus, slot->device, 161 slot->hp_slot, slot->number, ctrl->slot_device_offset); 162 retval = pci_hp_register(slot->hotplug_slot); 163 if (retval) { 164 err("pci_hp_register failed with error %d\n", retval); 165 if (retval == -EEXIST) 166 err("Failed to register slot because of name " 167 "collision. Try \'shpchp_slot_with_bus\' " 168 "module option.\n"); 169 goto error_info; 170 } 171 172 list_add(&slot->slot_list, &ctrl->slot_list); 173 } 174 175 return 0; 176 error_info: 177 kfree(info); 178 error_hpslot: 179 kfree(hotplug_slot); 180 error_slot: 181 kfree(slot); 182 error: 183 return retval; 184 } 185 186 void cleanup_slots(struct controller *ctrl) 187 { 188 struct list_head *tmp; 189 struct list_head *next; 190 struct slot *slot; 191 192 list_for_each_safe(tmp, next, &ctrl->slot_list) { 193 slot = list_entry(tmp, struct slot, slot_list); 194 list_del(&slot->slot_list); 195 cancel_delayed_work(&slot->work); 196 flush_scheduled_work(); 197 flush_workqueue(shpchp_wq); 198 pci_hp_deregister(slot->hotplug_slot); 199 } 200 } 201 202 /* 203 * set_attention_status - Turns the Amber LED for a slot on, off or blink 204 */ 205 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 206 { 207 struct slot *slot = get_slot(hotplug_slot); 208 209 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 210 211 hotplug_slot->info->attention_status = status; 212 slot->hpc_ops->set_attention_status(slot, status); 213 214 return 0; 215 } 216 217 static int enable_slot (struct hotplug_slot *hotplug_slot) 218 { 219 struct slot *slot = get_slot(hotplug_slot); 220 221 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 222 223 return shpchp_sysfs_enable_slot(slot); 224 } 225 226 static int disable_slot (struct hotplug_slot *hotplug_slot) 227 { 228 struct slot *slot = get_slot(hotplug_slot); 229 230 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 231 232 return shpchp_sysfs_disable_slot(slot); 233 } 234 235 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 236 { 237 struct slot *slot = get_slot(hotplug_slot); 238 int retval; 239 240 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 241 242 retval = slot->hpc_ops->get_power_status(slot, value); 243 if (retval < 0) 244 *value = hotplug_slot->info->power_status; 245 246 return 0; 247 } 248 249 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 250 { 251 struct slot *slot = get_slot(hotplug_slot); 252 int retval; 253 254 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 255 256 retval = slot->hpc_ops->get_attention_status(slot, value); 257 if (retval < 0) 258 *value = hotplug_slot->info->attention_status; 259 260 return 0; 261 } 262 263 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 264 { 265 struct slot *slot = get_slot(hotplug_slot); 266 int retval; 267 268 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 269 270 retval = slot->hpc_ops->get_latch_status(slot, value); 271 if (retval < 0) 272 *value = hotplug_slot->info->latch_status; 273 274 return 0; 275 } 276 277 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 278 { 279 struct slot *slot = get_slot(hotplug_slot); 280 int retval; 281 282 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 283 284 retval = slot->hpc_ops->get_adapter_status(slot, value); 285 if (retval < 0) 286 *value = hotplug_slot->info->adapter_status; 287 288 return 0; 289 } 290 291 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value) 292 { 293 struct slot *slot = get_slot(hotplug_slot); 294 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate; 295 296 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 297 298 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device; 299 300 return 0; 301 } 302 303 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 304 { 305 struct slot *slot = get_slot(hotplug_slot); 306 int retval; 307 308 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 309 310 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 311 if (retval < 0) 312 *value = PCI_SPEED_UNKNOWN; 313 314 return 0; 315 } 316 317 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 318 { 319 struct slot *slot = get_slot(hotplug_slot); 320 int retval; 321 322 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 323 324 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 325 if (retval < 0) 326 *value = PCI_SPEED_UNKNOWN; 327 328 return 0; 329 } 330 331 static int is_shpc_capable(struct pci_dev *dev) 332 { 333 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 334 PCI_DEVICE_ID_AMD_GOLAM_7450)) 335 return 1; 336 if (pci_find_capability(dev, PCI_CAP_ID_SHPC)) 337 return 1; 338 339 return 0; 340 } 341 342 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 343 { 344 int rc; 345 struct controller *ctrl; 346 347 if (!is_shpc_capable(pdev)) 348 return -ENODEV; 349 350 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 351 if (!ctrl) { 352 err("%s : out of memory\n", __func__); 353 goto err_out_none; 354 } 355 INIT_LIST_HEAD(&ctrl->slot_list); 356 357 rc = shpc_init(ctrl, pdev); 358 if (rc) { 359 dbg("%s: controller initialization failed\n", 360 SHPC_MODULE_NAME); 361 goto err_out_free_ctrl; 362 } 363 364 pci_set_drvdata(pdev, ctrl); 365 366 /* Setup the slot information structures */ 367 rc = init_slots(ctrl); 368 if (rc) { 369 err("%s: slot initialization failed\n", SHPC_MODULE_NAME); 370 goto err_out_release_ctlr; 371 } 372 373 rc = shpchp_create_ctrl_files(ctrl); 374 if (rc) 375 goto err_cleanup_slots; 376 377 return 0; 378 379 err_cleanup_slots: 380 cleanup_slots(ctrl); 381 err_out_release_ctlr: 382 ctrl->hpc_ops->release_ctlr(ctrl); 383 err_out_free_ctrl: 384 kfree(ctrl); 385 err_out_none: 386 return -ENODEV; 387 } 388 389 static void shpc_remove(struct pci_dev *dev) 390 { 391 struct controller *ctrl = pci_get_drvdata(dev); 392 393 shpchp_remove_ctrl_files(ctrl); 394 ctrl->hpc_ops->release_ctlr(ctrl); 395 kfree(ctrl); 396 } 397 398 static struct pci_device_id shpcd_pci_tbl[] = { 399 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 400 { /* end: all zeroes */ } 401 }; 402 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 403 404 static struct pci_driver shpc_driver = { 405 .name = SHPC_MODULE_NAME, 406 .id_table = shpcd_pci_tbl, 407 .probe = shpc_probe, 408 .remove = shpc_remove, 409 }; 410 411 static int __init shpcd_init(void) 412 { 413 int retval = 0; 414 415 retval = pci_register_driver(&shpc_driver); 416 dbg("%s: pci_register_driver = %d\n", __func__, retval); 417 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 418 return retval; 419 } 420 421 static void __exit shpcd_cleanup(void) 422 { 423 dbg("unload_shpchpd()\n"); 424 pci_unregister_driver(&shpc_driver); 425 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 426 } 427 428 module_init(shpcd_init); 429 module_exit(shpcd_cleanup); 430