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_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", __func__, hotplug_slot->name); 93 94 kfree(slot->hotplug_slot->info); 95 kfree(slot->hotplug_slot); 96 kfree(slot); 97 } 98 99 static int init_slots(struct controller *ctrl) 100 { 101 struct slot *slot; 102 struct hotplug_slot *hotplug_slot; 103 struct hotplug_slot_info *info; 104 int retval = -ENOMEM; 105 int i, len, dup = 1; 106 107 for (i = 0; i < ctrl->num_slots; i++) { 108 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 109 if (!slot) 110 goto error; 111 112 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 113 if (!hotplug_slot) 114 goto error_slot; 115 slot->hotplug_slot = hotplug_slot; 116 117 info = kzalloc(sizeof(*info), GFP_KERNEL); 118 if (!info) 119 goto error_hpslot; 120 hotplug_slot->info = info; 121 122 hotplug_slot->name = slot->name; 123 124 slot->hp_slot = i; 125 slot->ctrl = ctrl; 126 slot->bus = ctrl->pci_dev->subordinate->number; 127 slot->device = ctrl->slot_device_offset + i; 128 slot->hpc_ops = ctrl->hpc_ops; 129 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 130 mutex_init(&slot->lock); 131 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 132 133 /* register this slot with the hotplug pci core */ 134 hotplug_slot->private = slot; 135 hotplug_slot->release = &release_slot; 136 snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number); 137 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 138 139 get_power_status(hotplug_slot, &info->power_status); 140 get_attention_status(hotplug_slot, &info->attention_status); 141 get_latch_status(hotplug_slot, &info->latch_status); 142 get_adapter_status(hotplug_slot, &info->adapter_status); 143 144 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " 145 "slot_device_offset=%x\n", slot->bus, slot->device, 146 slot->hp_slot, slot->number, ctrl->slot_device_offset); 147 duplicate_name: 148 retval = pci_hp_register(slot->hotplug_slot, 149 ctrl->pci_dev->subordinate, slot->device); 150 if (retval) { 151 /* 152 * If slot N already exists, we'll try to create 153 * slot N-1, N-2 ... N-M, until we overflow. 154 */ 155 if (retval == -EEXIST) { 156 len = snprintf(slot->name, SLOT_NAME_SIZE, 157 "%d-%d", slot->number, dup++); 158 if (len < SLOT_NAME_SIZE) 159 goto duplicate_name; 160 else 161 err("duplicate slot name overflow\n"); 162 } 163 err("pci_hp_register failed with error %d\n", retval); 164 goto error_info; 165 } 166 167 list_add(&slot->slot_list, &ctrl->slot_list); 168 } 169 170 return 0; 171 error_info: 172 kfree(info); 173 error_hpslot: 174 kfree(hotplug_slot); 175 error_slot: 176 kfree(slot); 177 error: 178 return retval; 179 } 180 181 void cleanup_slots(struct controller *ctrl) 182 { 183 struct list_head *tmp; 184 struct list_head *next; 185 struct slot *slot; 186 187 list_for_each_safe(tmp, next, &ctrl->slot_list) { 188 slot = list_entry(tmp, struct slot, slot_list); 189 list_del(&slot->slot_list); 190 cancel_delayed_work(&slot->work); 191 flush_scheduled_work(); 192 flush_workqueue(shpchp_wq); 193 pci_hp_deregister(slot->hotplug_slot); 194 } 195 } 196 197 /* 198 * set_attention_status - Turns the Amber LED for a slot on, off or blink 199 */ 200 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 201 { 202 struct slot *slot = get_slot(hotplug_slot); 203 204 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 205 206 hotplug_slot->info->attention_status = status; 207 slot->hpc_ops->set_attention_status(slot, status); 208 209 return 0; 210 } 211 212 static int enable_slot (struct hotplug_slot *hotplug_slot) 213 { 214 struct slot *slot = get_slot(hotplug_slot); 215 216 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 217 218 return shpchp_sysfs_enable_slot(slot); 219 } 220 221 static int disable_slot (struct hotplug_slot *hotplug_slot) 222 { 223 struct slot *slot = get_slot(hotplug_slot); 224 225 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 226 227 return shpchp_sysfs_disable_slot(slot); 228 } 229 230 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 231 { 232 struct slot *slot = get_slot(hotplug_slot); 233 int retval; 234 235 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 236 237 retval = slot->hpc_ops->get_power_status(slot, value); 238 if (retval < 0) 239 *value = hotplug_slot->info->power_status; 240 241 return 0; 242 } 243 244 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 245 { 246 struct slot *slot = get_slot(hotplug_slot); 247 int retval; 248 249 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 250 251 retval = slot->hpc_ops->get_attention_status(slot, value); 252 if (retval < 0) 253 *value = hotplug_slot->info->attention_status; 254 255 return 0; 256 } 257 258 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 259 { 260 struct slot *slot = get_slot(hotplug_slot); 261 int retval; 262 263 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 264 265 retval = slot->hpc_ops->get_latch_status(slot, value); 266 if (retval < 0) 267 *value = hotplug_slot->info->latch_status; 268 269 return 0; 270 } 271 272 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 273 { 274 struct slot *slot = get_slot(hotplug_slot); 275 int retval; 276 277 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 278 279 retval = slot->hpc_ops->get_adapter_status(slot, value); 280 if (retval < 0) 281 *value = hotplug_slot->info->adapter_status; 282 283 return 0; 284 } 285 286 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, 287 enum pci_bus_speed *value) 288 { 289 struct slot *slot = get_slot(hotplug_slot); 290 int retval; 291 292 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 293 294 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 295 if (retval < 0) 296 *value = PCI_SPEED_UNKNOWN; 297 298 return 0; 299 } 300 301 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 302 { 303 struct slot *slot = get_slot(hotplug_slot); 304 int retval; 305 306 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); 307 308 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 309 if (retval < 0) 310 *value = PCI_SPEED_UNKNOWN; 311 312 return 0; 313 } 314 315 static int is_shpc_capable(struct pci_dev *dev) 316 { 317 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 318 PCI_DEVICE_ID_AMD_GOLAM_7450)) 319 return 1; 320 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 321 return 0; 322 if (get_hp_hw_control_from_firmware(dev)) 323 return 0; 324 return 1; 325 } 326 327 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 328 { 329 int rc; 330 struct controller *ctrl; 331 332 if (!is_shpc_capable(pdev)) 333 return -ENODEV; 334 335 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 336 if (!ctrl) { 337 err("%s : out of memory\n", __func__); 338 goto err_out_none; 339 } 340 INIT_LIST_HEAD(&ctrl->slot_list); 341 342 rc = shpc_init(ctrl, pdev); 343 if (rc) { 344 dbg("%s: controller initialization failed\n", 345 SHPC_MODULE_NAME); 346 goto err_out_free_ctrl; 347 } 348 349 pci_set_drvdata(pdev, ctrl); 350 351 /* Setup the slot information structures */ 352 rc = init_slots(ctrl); 353 if (rc) { 354 err("%s: slot initialization failed\n", SHPC_MODULE_NAME); 355 goto err_out_release_ctlr; 356 } 357 358 rc = shpchp_create_ctrl_files(ctrl); 359 if (rc) 360 goto err_cleanup_slots; 361 362 return 0; 363 364 err_cleanup_slots: 365 cleanup_slots(ctrl); 366 err_out_release_ctlr: 367 ctrl->hpc_ops->release_ctlr(ctrl); 368 err_out_free_ctrl: 369 kfree(ctrl); 370 err_out_none: 371 return -ENODEV; 372 } 373 374 static void shpc_remove(struct pci_dev *dev) 375 { 376 struct controller *ctrl = pci_get_drvdata(dev); 377 378 shpchp_remove_ctrl_files(ctrl); 379 ctrl->hpc_ops->release_ctlr(ctrl); 380 kfree(ctrl); 381 } 382 383 static struct pci_device_id shpcd_pci_tbl[] = { 384 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 385 { /* end: all zeroes */ } 386 }; 387 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 388 389 static struct pci_driver shpc_driver = { 390 .name = SHPC_MODULE_NAME, 391 .id_table = shpcd_pci_tbl, 392 .probe = shpc_probe, 393 .remove = shpc_remove, 394 }; 395 396 static int __init shpcd_init(void) 397 { 398 int retval = 0; 399 400 retval = pci_register_driver(&shpc_driver); 401 dbg("%s: pci_register_driver = %d\n", __func__, retval); 402 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 403 return retval; 404 } 405 406 static void __exit shpcd_cleanup(void) 407 { 408 dbg("unload_shpchpd()\n"); 409 pci_unregister_driver(&shpc_driver); 410 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 411 } 412 413 module_init(shpcd_init); 414 module_exit(shpcd_cleanup); 415