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 static 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_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 72 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); 73 74 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 75 .owner = THIS_MODULE, 76 .set_attention_status = set_attention_status, 77 .enable_slot = enable_slot, 78 .disable_slot = disable_slot, 79 .get_power_status = get_power_status, 80 .get_attention_status = get_attention_status, 81 .get_latch_status = get_latch_status, 82 .get_adapter_status = get_adapter_status, 83 .get_max_bus_speed = get_max_bus_speed, 84 .get_cur_bus_speed = get_cur_bus_speed, 85 }; 86 87 /** 88 * release_slot - free up the memory used by a slot 89 * @hotplug_slot: slot to free 90 */ 91 static void release_slot(struct hotplug_slot *hotplug_slot) 92 { 93 struct slot *slot = hotplug_slot->private; 94 95 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 96 97 kfree(slot->hotplug_slot->info); 98 kfree(slot->hotplug_slot); 99 kfree(slot); 100 } 101 102 static void make_slot_name(struct slot *slot) 103 { 104 if (shpchp_slot_with_bus) 105 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d", 106 slot->bus, slot->number); 107 else 108 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d", 109 slot->number); 110 } 111 112 static int init_slots(struct controller *ctrl) 113 { 114 struct slot *slot; 115 struct hotplug_slot *hotplug_slot; 116 struct hotplug_slot_info *info; 117 int retval = -ENOMEM; 118 int i; 119 120 for (i = 0; i < ctrl->num_slots; i++) { 121 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 122 if (!slot) 123 goto error; 124 125 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 126 if (!hotplug_slot) 127 goto error_slot; 128 slot->hotplug_slot = hotplug_slot; 129 130 info = kzalloc(sizeof(*info), GFP_KERNEL); 131 if (!info) 132 goto error_hpslot; 133 hotplug_slot->info = info; 134 135 hotplug_slot->name = slot->name; 136 137 slot->hp_slot = i; 138 slot->ctrl = ctrl; 139 slot->bus = ctrl->pci_dev->subordinate->number; 140 slot->device = ctrl->slot_device_offset + i; 141 slot->hpc_ops = ctrl->hpc_ops; 142 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 143 mutex_init(&slot->lock); 144 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 145 146 /* register this slot with the hotplug pci core */ 147 hotplug_slot->private = slot; 148 hotplug_slot->release = &release_slot; 149 make_slot_name(slot); 150 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 151 152 get_power_status(hotplug_slot, &info->power_status); 153 get_attention_status(hotplug_slot, &info->attention_status); 154 get_latch_status(hotplug_slot, &info->latch_status); 155 get_adapter_status(hotplug_slot, &info->adapter_status); 156 157 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " 158 "slot_device_offset=%x\n", slot->bus, slot->device, 159 slot->hp_slot, slot->number, ctrl->slot_device_offset); 160 retval = pci_hp_register(slot->hotplug_slot, 161 ctrl->pci_dev->subordinate, slot->device); 162 if (retval) { 163 err("pci_hp_register failed with error %d\n", retval); 164 if (retval == -EEXIST) 165 err("Failed to register slot because of name " 166 "collision. Try \'shpchp_slot_with_bus\' " 167 "module option.\n"); 168 goto error_info; 169 } 170 171 list_add(&slot->slot_list, &ctrl->slot_list); 172 } 173 174 return 0; 175 error_info: 176 kfree(info); 177 error_hpslot: 178 kfree(hotplug_slot); 179 error_slot: 180 kfree(slot); 181 error: 182 return retval; 183 } 184 185 void cleanup_slots(struct controller *ctrl) 186 { 187 struct list_head *tmp; 188 struct list_head *next; 189 struct slot *slot; 190 191 list_for_each_safe(tmp, next, &ctrl->slot_list) { 192 slot = list_entry(tmp, struct slot, slot_list); 193 list_del(&slot->slot_list); 194 cancel_delayed_work(&slot->work); 195 flush_scheduled_work(); 196 flush_workqueue(shpchp_wq); 197 pci_hp_deregister(slot->hotplug_slot); 198 } 199 } 200 201 /* 202 * set_attention_status - Turns the Amber LED for a slot on, off or blink 203 */ 204 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 205 { 206 struct slot *slot = get_slot(hotplug_slot); 207 208 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 209 210 hotplug_slot->info->attention_status = status; 211 slot->hpc_ops->set_attention_status(slot, status); 212 213 return 0; 214 } 215 216 static int enable_slot (struct hotplug_slot *hotplug_slot) 217 { 218 struct slot *slot = get_slot(hotplug_slot); 219 220 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 221 222 return shpchp_sysfs_enable_slot(slot); 223 } 224 225 static int disable_slot (struct hotplug_slot *hotplug_slot) 226 { 227 struct slot *slot = get_slot(hotplug_slot); 228 229 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 230 231 return shpchp_sysfs_disable_slot(slot); 232 } 233 234 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 235 { 236 struct slot *slot = get_slot(hotplug_slot); 237 int retval; 238 239 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 240 241 retval = slot->hpc_ops->get_power_status(slot, value); 242 if (retval < 0) 243 *value = hotplug_slot->info->power_status; 244 245 return 0; 246 } 247 248 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 249 { 250 struct slot *slot = get_slot(hotplug_slot); 251 int retval; 252 253 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 254 255 retval = slot->hpc_ops->get_attention_status(slot, value); 256 if (retval < 0) 257 *value = hotplug_slot->info->attention_status; 258 259 return 0; 260 } 261 262 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 263 { 264 struct slot *slot = get_slot(hotplug_slot); 265 int retval; 266 267 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 268 269 retval = slot->hpc_ops->get_latch_status(slot, value); 270 if (retval < 0) 271 *value = hotplug_slot->info->latch_status; 272 273 return 0; 274 } 275 276 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 277 { 278 struct slot *slot = get_slot(hotplug_slot); 279 int retval; 280 281 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 282 283 retval = slot->hpc_ops->get_adapter_status(slot, value); 284 if (retval < 0) 285 *value = hotplug_slot->info->adapter_status; 286 287 return 0; 288 } 289 290 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, 291 enum pci_bus_speed *value) 292 { 293 struct slot *slot = get_slot(hotplug_slot); 294 int retval; 295 296 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 297 298 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 299 if (retval < 0) 300 *value = PCI_SPEED_UNKNOWN; 301 302 return 0; 303 } 304 305 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 306 { 307 struct slot *slot = get_slot(hotplug_slot); 308 int retval; 309 310 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 311 312 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 313 if (retval < 0) 314 *value = PCI_SPEED_UNKNOWN; 315 316 return 0; 317 } 318 319 static int is_shpc_capable(struct pci_dev *dev) 320 { 321 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 322 PCI_DEVICE_ID_AMD_GOLAM_7450)) 323 return 1; 324 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 325 return 0; 326 if (get_hp_hw_control_from_firmware(dev)) 327 return 0; 328 return 1; 329 } 330 331 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 332 { 333 int rc; 334 struct controller *ctrl; 335 336 if (!is_shpc_capable(pdev)) 337 return -ENODEV; 338 339 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 340 if (!ctrl) { 341 err("%s : out of memory\n", __func__); 342 goto err_out_none; 343 } 344 INIT_LIST_HEAD(&ctrl->slot_list); 345 346 rc = shpc_init(ctrl, pdev); 347 if (rc) { 348 dbg("%s: controller initialization failed\n", 349 SHPC_MODULE_NAME); 350 goto err_out_free_ctrl; 351 } 352 353 pci_set_drvdata(pdev, ctrl); 354 355 /* Setup the slot information structures */ 356 rc = init_slots(ctrl); 357 if (rc) { 358 err("%s: slot initialization failed\n", SHPC_MODULE_NAME); 359 goto err_out_release_ctlr; 360 } 361 362 rc = shpchp_create_ctrl_files(ctrl); 363 if (rc) 364 goto err_cleanup_slots; 365 366 return 0; 367 368 err_cleanup_slots: 369 cleanup_slots(ctrl); 370 err_out_release_ctlr: 371 ctrl->hpc_ops->release_ctlr(ctrl); 372 err_out_free_ctrl: 373 kfree(ctrl); 374 err_out_none: 375 return -ENODEV; 376 } 377 378 static void shpc_remove(struct pci_dev *dev) 379 { 380 struct controller *ctrl = pci_get_drvdata(dev); 381 382 shpchp_remove_ctrl_files(ctrl); 383 ctrl->hpc_ops->release_ctlr(ctrl); 384 kfree(ctrl); 385 } 386 387 static struct pci_device_id shpcd_pci_tbl[] = { 388 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 389 { /* end: all zeroes */ } 390 }; 391 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 392 393 static struct pci_driver shpc_driver = { 394 .name = SHPC_MODULE_NAME, 395 .id_table = shpcd_pci_tbl, 396 .probe = shpc_probe, 397 .remove = shpc_remove, 398 }; 399 400 static int __init shpcd_init(void) 401 { 402 int retval = 0; 403 404 retval = pci_register_driver(&shpc_driver); 405 dbg("%s: pci_register_driver = %d\n", __func__, retval); 406 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 407 return retval; 408 } 409 410 static void __exit shpcd_cleanup(void) 411 { 412 dbg("unload_shpchpd()\n"); 413 pci_unregister_driver(&shpc_driver); 414 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 415 } 416 417 module_init(shpcd_init); 418 module_exit(shpcd_cleanup); 419