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 static int init_slots(struct controller *ctrl) 108 { 109 struct slot *slot; 110 struct hotplug_slot *hotplug_slot; 111 struct hotplug_slot_info *info; 112 int retval = -ENOMEM; 113 int i; 114 115 for (i = 0; i < ctrl->num_slots; i++) { 116 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 117 if (!slot) 118 goto error; 119 120 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 121 if (!hotplug_slot) 122 goto error_slot; 123 slot->hotplug_slot = hotplug_slot; 124 125 info = kzalloc(sizeof(*info), GFP_KERNEL); 126 if (!info) 127 goto error_hpslot; 128 hotplug_slot->info = info; 129 130 hotplug_slot->name = slot->name; 131 132 slot->hp_slot = i; 133 slot->ctrl = ctrl; 134 slot->bus = ctrl->pci_dev->subordinate->number; 135 slot->device = ctrl->slot_device_offset + i; 136 slot->hpc_ops = ctrl->hpc_ops; 137 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 138 mutex_init(&slot->lock); 139 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 140 141 /* register this slot with the hotplug pci core */ 142 hotplug_slot->private = slot; 143 hotplug_slot->release = &release_slot; 144 make_slot_name(slot); 145 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 146 147 get_power_status(hotplug_slot, &info->power_status); 148 get_attention_status(hotplug_slot, &info->attention_status); 149 get_latch_status(hotplug_slot, &info->latch_status); 150 get_adapter_status(hotplug_slot, &info->adapter_status); 151 152 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " 153 "slot_device_offset=%x\n", slot->bus, slot->device, 154 slot->hp_slot, slot->number, ctrl->slot_device_offset); 155 retval = pci_hp_register(slot->hotplug_slot); 156 if (retval) { 157 err("pci_hp_register failed with error %d\n", retval); 158 goto error_info; 159 } 160 161 list_add(&slot->slot_list, &ctrl->slot_list); 162 } 163 164 return 0; 165 error_info: 166 kfree(info); 167 error_hpslot: 168 kfree(hotplug_slot); 169 error_slot: 170 kfree(slot); 171 error: 172 return retval; 173 } 174 175 void cleanup_slots(struct controller *ctrl) 176 { 177 struct list_head *tmp; 178 struct list_head *next; 179 struct slot *slot; 180 181 list_for_each_safe(tmp, next, &ctrl->slot_list) { 182 slot = list_entry(tmp, struct slot, slot_list); 183 list_del(&slot->slot_list); 184 cancel_delayed_work(&slot->work); 185 flush_scheduled_work(); 186 flush_workqueue(shpchp_wq); 187 pci_hp_deregister(slot->hotplug_slot); 188 } 189 } 190 191 /* 192 * set_attention_status - Turns the Amber LED for a slot on, off or blink 193 */ 194 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 195 { 196 struct slot *slot = get_slot(hotplug_slot); 197 198 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 199 200 hotplug_slot->info->attention_status = status; 201 slot->hpc_ops->set_attention_status(slot, status); 202 203 return 0; 204 } 205 206 static int enable_slot (struct hotplug_slot *hotplug_slot) 207 { 208 struct slot *slot = get_slot(hotplug_slot); 209 210 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 211 212 return shpchp_sysfs_enable_slot(slot); 213 } 214 215 static int disable_slot (struct hotplug_slot *hotplug_slot) 216 { 217 struct slot *slot = get_slot(hotplug_slot); 218 219 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 220 221 return shpchp_sysfs_disable_slot(slot); 222 } 223 224 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 225 { 226 struct slot *slot = get_slot(hotplug_slot); 227 int retval; 228 229 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 230 231 retval = slot->hpc_ops->get_power_status(slot, value); 232 if (retval < 0) 233 *value = hotplug_slot->info->power_status; 234 235 return 0; 236 } 237 238 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 239 { 240 struct slot *slot = get_slot(hotplug_slot); 241 int retval; 242 243 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 244 245 retval = slot->hpc_ops->get_attention_status(slot, value); 246 if (retval < 0) 247 *value = hotplug_slot->info->attention_status; 248 249 return 0; 250 } 251 252 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 253 { 254 struct slot *slot = get_slot(hotplug_slot); 255 int retval; 256 257 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 258 259 retval = slot->hpc_ops->get_latch_status(slot, value); 260 if (retval < 0) 261 *value = hotplug_slot->info->latch_status; 262 263 return 0; 264 } 265 266 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 267 { 268 struct slot *slot = get_slot(hotplug_slot); 269 int retval; 270 271 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 272 273 retval = slot->hpc_ops->get_adapter_status(slot, value); 274 if (retval < 0) 275 *value = hotplug_slot->info->adapter_status; 276 277 return 0; 278 } 279 280 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value) 281 { 282 struct slot *slot = get_slot(hotplug_slot); 283 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate; 284 285 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 286 287 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device; 288 289 return 0; 290 } 291 292 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 293 { 294 struct slot *slot = get_slot(hotplug_slot); 295 int retval; 296 297 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 298 299 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 300 if (retval < 0) 301 *value = PCI_SPEED_UNKNOWN; 302 303 return 0; 304 } 305 306 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 307 { 308 struct slot *slot = get_slot(hotplug_slot); 309 int retval; 310 311 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); 312 313 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 314 if (retval < 0) 315 *value = PCI_SPEED_UNKNOWN; 316 317 return 0; 318 } 319 320 static int is_shpc_capable(struct pci_dev *dev) 321 { 322 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 323 PCI_DEVICE_ID_AMD_GOLAM_7450)) 324 return 1; 325 if (pci_find_capability(dev, PCI_CAP_ID_SHPC)) 326 return 1; 327 328 return 0; 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", __FUNCTION__); 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", __FUNCTION__, 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