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 .set_attention_status = set_attention_status, 73 .enable_slot = enable_slot, 74 .disable_slot = disable_slot, 75 .get_power_status = get_power_status, 76 .get_attention_status = get_attention_status, 77 .get_latch_status = get_latch_status, 78 .get_adapter_status = get_adapter_status, 79 .get_max_bus_speed = get_max_bus_speed, 80 .get_cur_bus_speed = get_cur_bus_speed, 81 }; 82 83 /** 84 * release_slot - free up the memory used by a slot 85 * @hotplug_slot: slot to free 86 */ 87 static void release_slot(struct hotplug_slot *hotplug_slot) 88 { 89 struct slot *slot = hotplug_slot->private; 90 91 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 92 __func__, slot_name(slot)); 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 char name[SLOT_NAME_SIZE]; 105 int retval = -ENOMEM; 106 int i; 107 108 for (i = 0; i < ctrl->num_slots; i++) { 109 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 110 if (!slot) 111 goto error; 112 113 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 114 if (!hotplug_slot) 115 goto error_slot; 116 slot->hotplug_slot = hotplug_slot; 117 118 info = kzalloc(sizeof(*info), GFP_KERNEL); 119 if (!info) 120 goto error_hpslot; 121 hotplug_slot->info = info; 122 123 slot->hp_slot = i; 124 slot->ctrl = ctrl; 125 slot->bus = ctrl->pci_dev->subordinate->number; 126 slot->device = ctrl->slot_device_offset + i; 127 slot->hpc_ops = ctrl->hpc_ops; 128 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 129 mutex_init(&slot->lock); 130 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 131 132 /* register this slot with the hotplug pci core */ 133 hotplug_slot->private = slot; 134 hotplug_slot->release = &release_slot; 135 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); 136 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 137 138 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x " 139 "hp_slot=%x sun=%x slot_device_offset=%x\n", 140 pci_domain_nr(ctrl->pci_dev->subordinate), 141 slot->bus, slot->device, slot->hp_slot, slot->number, 142 ctrl->slot_device_offset); 143 retval = pci_hp_register(slot->hotplug_slot, 144 ctrl->pci_dev->subordinate, slot->device, name); 145 if (retval) { 146 ctrl_err(ctrl, "pci_hp_register failed with error %d\n", 147 retval); 148 goto error_info; 149 } 150 151 get_power_status(hotplug_slot, &info->power_status); 152 get_attention_status(hotplug_slot, &info->attention_status); 153 get_latch_status(hotplug_slot, &info->latch_status); 154 get_adapter_status(hotplug_slot, &info->adapter_status); 155 156 list_add(&slot->slot_list, &ctrl->slot_list); 157 } 158 159 return 0; 160 error_info: 161 kfree(info); 162 error_hpslot: 163 kfree(hotplug_slot); 164 error_slot: 165 kfree(slot); 166 error: 167 return retval; 168 } 169 170 void cleanup_slots(struct controller *ctrl) 171 { 172 struct list_head *tmp; 173 struct list_head *next; 174 struct slot *slot; 175 176 list_for_each_safe(tmp, next, &ctrl->slot_list) { 177 slot = list_entry(tmp, struct slot, slot_list); 178 list_del(&slot->slot_list); 179 cancel_delayed_work(&slot->work); 180 flush_scheduled_work(); 181 flush_workqueue(shpchp_wq); 182 pci_hp_deregister(slot->hotplug_slot); 183 } 184 } 185 186 /* 187 * set_attention_status - Turns the Amber LED for a slot on, off or blink 188 */ 189 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 190 { 191 struct slot *slot = get_slot(hotplug_slot); 192 193 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 194 __func__, slot_name(slot)); 195 196 hotplug_slot->info->attention_status = status; 197 slot->hpc_ops->set_attention_status(slot, status); 198 199 return 0; 200 } 201 202 static int enable_slot (struct hotplug_slot *hotplug_slot) 203 { 204 struct slot *slot = get_slot(hotplug_slot); 205 206 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 207 __func__, slot_name(slot)); 208 209 return shpchp_sysfs_enable_slot(slot); 210 } 211 212 static int disable_slot (struct hotplug_slot *hotplug_slot) 213 { 214 struct slot *slot = get_slot(hotplug_slot); 215 216 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 217 __func__, slot_name(slot)); 218 219 return shpchp_sysfs_disable_slot(slot); 220 } 221 222 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 223 { 224 struct slot *slot = get_slot(hotplug_slot); 225 int retval; 226 227 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 228 __func__, slot_name(slot)); 229 230 retval = slot->hpc_ops->get_power_status(slot, value); 231 if (retval < 0) 232 *value = hotplug_slot->info->power_status; 233 234 return 0; 235 } 236 237 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 238 { 239 struct slot *slot = get_slot(hotplug_slot); 240 int retval; 241 242 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 243 __func__, slot_name(slot)); 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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 258 __func__, slot_name(slot)); 259 260 retval = slot->hpc_ops->get_latch_status(slot, value); 261 if (retval < 0) 262 *value = hotplug_slot->info->latch_status; 263 264 return 0; 265 } 266 267 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 268 { 269 struct slot *slot = get_slot(hotplug_slot); 270 int retval; 271 272 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 273 __func__, slot_name(slot)); 274 275 retval = slot->hpc_ops->get_adapter_status(slot, value); 276 if (retval < 0) 277 *value = hotplug_slot->info->adapter_status; 278 279 return 0; 280 } 281 282 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, 283 enum pci_bus_speed *value) 284 { 285 struct slot *slot = get_slot(hotplug_slot); 286 int retval; 287 288 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 289 __func__, slot_name(slot)); 290 291 retval = slot->hpc_ops->get_max_bus_speed(slot, value); 292 if (retval < 0) 293 *value = PCI_SPEED_UNKNOWN; 294 295 return 0; 296 } 297 298 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 299 { 300 struct slot *slot = get_slot(hotplug_slot); 301 int retval; 302 303 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 304 __func__, slot_name(slot)); 305 306 retval = slot->hpc_ops->get_cur_bus_speed(slot, value); 307 if (retval < 0) 308 *value = PCI_SPEED_UNKNOWN; 309 310 return 0; 311 } 312 313 static int is_shpc_capable(struct pci_dev *dev) 314 { 315 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device == 316 PCI_DEVICE_ID_AMD_GOLAM_7450)) 317 return 1; 318 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 319 return 0; 320 if (get_hp_hw_control_from_firmware(dev)) 321 return 0; 322 return 1; 323 } 324 325 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 326 { 327 int rc; 328 struct controller *ctrl; 329 330 if (!is_shpc_capable(pdev)) 331 return -ENODEV; 332 333 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 334 if (!ctrl) { 335 dev_err(&pdev->dev, "%s: Out of memory\n", __func__); 336 goto err_out_none; 337 } 338 INIT_LIST_HEAD(&ctrl->slot_list); 339 340 rc = shpc_init(ctrl, pdev); 341 if (rc) { 342 ctrl_dbg(ctrl, "Controller initialization failed\n"); 343 goto err_out_free_ctrl; 344 } 345 346 pci_set_drvdata(pdev, ctrl); 347 348 /* Setup the slot information structures */ 349 rc = init_slots(ctrl); 350 if (rc) { 351 ctrl_err(ctrl, "Slot initialization failed\n"); 352 goto err_out_release_ctlr; 353 } 354 355 rc = shpchp_create_ctrl_files(ctrl); 356 if (rc) 357 goto err_cleanup_slots; 358 359 return 0; 360 361 err_cleanup_slots: 362 cleanup_slots(ctrl); 363 err_out_release_ctlr: 364 ctrl->hpc_ops->release_ctlr(ctrl); 365 err_out_free_ctrl: 366 kfree(ctrl); 367 err_out_none: 368 return -ENODEV; 369 } 370 371 static void shpc_remove(struct pci_dev *dev) 372 { 373 struct controller *ctrl = pci_get_drvdata(dev); 374 375 shpchp_remove_ctrl_files(ctrl); 376 ctrl->hpc_ops->release_ctlr(ctrl); 377 kfree(ctrl); 378 } 379 380 static struct pci_device_id shpcd_pci_tbl[] = { 381 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 382 { /* end: all zeroes */ } 383 }; 384 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 385 386 static struct pci_driver shpc_driver = { 387 .name = SHPC_MODULE_NAME, 388 .id_table = shpcd_pci_tbl, 389 .probe = shpc_probe, 390 .remove = shpc_remove, 391 }; 392 393 static int __init shpcd_init(void) 394 { 395 int retval = 0; 396 397 retval = pci_register_driver(&shpc_driver); 398 dbg("%s: pci_register_driver = %d\n", __func__, retval); 399 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 400 return retval; 401 } 402 403 static void __exit shpcd_cleanup(void) 404 { 405 dbg("unload_shpchpd()\n"); 406 pci_unregister_driver(&shpc_driver); 407 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 408 } 409 410 module_init(shpcd_init); 411 module_exit(shpcd_cleanup); 412