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/slab.h> 35 #include <linux/pci.h> 36 #include "shpchp.h" 37 38 /* Global variables */ 39 bool shpchp_debug; 40 bool shpchp_poll_mode; 41 int shpchp_poll_time; 42 struct workqueue_struct *shpchp_wq; 43 struct workqueue_struct *shpchp_ordered_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_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 57 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 58 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 59 60 #define SHPC_MODULE_NAME "shpchp" 61 62 static int set_attention_status (struct hotplug_slot *slot, u8 value); 63 static int enable_slot (struct hotplug_slot *slot); 64 static int disable_slot (struct hotplug_slot *slot); 65 static int get_power_status (struct hotplug_slot *slot, u8 *value); 66 static int get_attention_status (struct hotplug_slot *slot, u8 *value); 67 static int get_latch_status (struct hotplug_slot *slot, u8 *value); 68 static int get_adapter_status (struct hotplug_slot *slot, u8 *value); 69 70 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 71 .set_attention_status = set_attention_status, 72 .enable_slot = enable_slot, 73 .disable_slot = disable_slot, 74 .get_power_status = get_power_status, 75 .get_attention_status = get_attention_status, 76 .get_latch_status = get_latch_status, 77 .get_adapter_status = get_adapter_status, 78 }; 79 80 /** 81 * release_slot - free up the memory used by a slot 82 * @hotplug_slot: slot to free 83 */ 84 static void release_slot(struct hotplug_slot *hotplug_slot) 85 { 86 struct slot *slot = hotplug_slot->private; 87 88 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 89 __func__, slot_name(slot)); 90 91 kfree(slot->hotplug_slot->info); 92 kfree(slot->hotplug_slot); 93 kfree(slot); 94 } 95 96 static int init_slots(struct controller *ctrl) 97 { 98 struct slot *slot; 99 struct hotplug_slot *hotplug_slot; 100 struct hotplug_slot_info *info; 101 char name[SLOT_NAME_SIZE]; 102 int retval; 103 int i; 104 105 for (i = 0; i < ctrl->num_slots; i++) { 106 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 107 if (!slot) { 108 retval = -ENOMEM; 109 goto error; 110 } 111 112 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 113 if (!hotplug_slot) { 114 retval = -ENOMEM; 115 goto error_slot; 116 } 117 slot->hotplug_slot = hotplug_slot; 118 119 info = kzalloc(sizeof(*info), GFP_KERNEL); 120 if (!info) { 121 retval = -ENOMEM; 122 goto error_hpslot; 123 } 124 hotplug_slot->info = info; 125 126 slot->hp_slot = i; 127 slot->ctrl = ctrl; 128 slot->bus = ctrl->pci_dev->subordinate->number; 129 slot->device = ctrl->slot_device_offset + i; 130 slot->hpc_ops = ctrl->hpc_ops; 131 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 132 mutex_init(&slot->lock); 133 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 134 135 /* register this slot with the hotplug pci core */ 136 hotplug_slot->private = slot; 137 hotplug_slot->release = &release_slot; 138 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); 139 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 140 141 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x " 142 "hp_slot=%x sun=%x slot_device_offset=%x\n", 143 pci_domain_nr(ctrl->pci_dev->subordinate), 144 slot->bus, slot->device, slot->hp_slot, slot->number, 145 ctrl->slot_device_offset); 146 retval = pci_hp_register(slot->hotplug_slot, 147 ctrl->pci_dev->subordinate, slot->device, name); 148 if (retval) { 149 ctrl_err(ctrl, "pci_hp_register failed with error %d\n", 150 retval); 151 goto error_info; 152 } 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 list_add(&slot->slot_list, &ctrl->slot_list); 160 } 161 162 return 0; 163 error_info: 164 kfree(info); 165 error_hpslot: 166 kfree(hotplug_slot); 167 error_slot: 168 kfree(slot); 169 error: 170 return retval; 171 } 172 173 void cleanup_slots(struct controller *ctrl) 174 { 175 struct list_head *tmp; 176 struct list_head *next; 177 struct slot *slot; 178 179 list_for_each_safe(tmp, next, &ctrl->slot_list) { 180 slot = list_entry(tmp, struct slot, slot_list); 181 list_del(&slot->slot_list); 182 cancel_delayed_work(&slot->work); 183 flush_workqueue(shpchp_wq); 184 flush_workqueue(shpchp_ordered_wq); 185 pci_hp_deregister(slot->hotplug_slot); 186 } 187 } 188 189 /* 190 * set_attention_status - Turns the Amber LED for a slot on, off or blink 191 */ 192 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 193 { 194 struct slot *slot = get_slot(hotplug_slot); 195 196 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 197 __func__, slot_name(slot)); 198 199 hotplug_slot->info->attention_status = status; 200 slot->hpc_ops->set_attention_status(slot, status); 201 202 return 0; 203 } 204 205 static int enable_slot (struct hotplug_slot *hotplug_slot) 206 { 207 struct slot *slot = get_slot(hotplug_slot); 208 209 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 210 __func__, slot_name(slot)); 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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 220 __func__, slot_name(slot)); 221 222 return shpchp_sysfs_disable_slot(slot); 223 } 224 225 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 226 { 227 struct slot *slot = get_slot(hotplug_slot); 228 int retval; 229 230 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 231 __func__, slot_name(slot)); 232 233 retval = slot->hpc_ops->get_power_status(slot, value); 234 if (retval < 0) 235 *value = hotplug_slot->info->power_status; 236 237 return 0; 238 } 239 240 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 241 { 242 struct slot *slot = get_slot(hotplug_slot); 243 int retval; 244 245 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 246 __func__, slot_name(slot)); 247 248 retval = slot->hpc_ops->get_attention_status(slot, value); 249 if (retval < 0) 250 *value = hotplug_slot->info->attention_status; 251 252 return 0; 253 } 254 255 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 256 { 257 struct slot *slot = get_slot(hotplug_slot); 258 int retval; 259 260 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 261 __func__, slot_name(slot)); 262 263 retval = slot->hpc_ops->get_latch_status(slot, value); 264 if (retval < 0) 265 *value = hotplug_slot->info->latch_status; 266 267 return 0; 268 } 269 270 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 271 { 272 struct slot *slot = get_slot(hotplug_slot); 273 int retval; 274 275 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 276 __func__, slot_name(slot)); 277 278 retval = slot->hpc_ops->get_adapter_status(slot, value); 279 if (retval < 0) 280 *value = hotplug_slot->info->adapter_status; 281 282 return 0; 283 } 284 285 static int is_shpc_capable(struct pci_dev *dev) 286 { 287 if (dev->vendor == PCI_VENDOR_ID_AMD && 288 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) 289 return 1; 290 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 291 return 0; 292 if (get_hp_hw_control_from_firmware(dev)) 293 return 0; 294 return 1; 295 } 296 297 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 298 { 299 int rc; 300 struct controller *ctrl; 301 302 if (!is_shpc_capable(pdev)) 303 return -ENODEV; 304 305 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 306 if (!ctrl) { 307 dev_err(&pdev->dev, "%s: Out of memory\n", __func__); 308 goto err_out_none; 309 } 310 INIT_LIST_HEAD(&ctrl->slot_list); 311 312 rc = shpc_init(ctrl, pdev); 313 if (rc) { 314 ctrl_dbg(ctrl, "Controller initialization failed\n"); 315 goto err_out_free_ctrl; 316 } 317 318 pci_set_drvdata(pdev, ctrl); 319 320 /* Setup the slot information structures */ 321 rc = init_slots(ctrl); 322 if (rc) { 323 ctrl_err(ctrl, "Slot initialization failed\n"); 324 goto err_out_release_ctlr; 325 } 326 327 rc = shpchp_create_ctrl_files(ctrl); 328 if (rc) 329 goto err_cleanup_slots; 330 331 return 0; 332 333 err_cleanup_slots: 334 cleanup_slots(ctrl); 335 err_out_release_ctlr: 336 ctrl->hpc_ops->release_ctlr(ctrl); 337 err_out_free_ctrl: 338 kfree(ctrl); 339 err_out_none: 340 return -ENODEV; 341 } 342 343 static void shpc_remove(struct pci_dev *dev) 344 { 345 struct controller *ctrl = pci_get_drvdata(dev); 346 347 shpchp_remove_ctrl_files(ctrl); 348 ctrl->hpc_ops->release_ctlr(ctrl); 349 kfree(ctrl); 350 } 351 352 static struct pci_device_id shpcd_pci_tbl[] = { 353 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 354 { /* end: all zeroes */ } 355 }; 356 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 357 358 static struct pci_driver shpc_driver = { 359 .name = SHPC_MODULE_NAME, 360 .id_table = shpcd_pci_tbl, 361 .probe = shpc_probe, 362 .remove = shpc_remove, 363 }; 364 365 static int __init shpcd_init(void) 366 { 367 int retval = 0; 368 369 shpchp_wq = alloc_ordered_workqueue("shpchp", 0); 370 if (!shpchp_wq) 371 return -ENOMEM; 372 373 shpchp_ordered_wq = alloc_ordered_workqueue("shpchp_ordered", 0); 374 if (!shpchp_ordered_wq) { 375 destroy_workqueue(shpchp_wq); 376 return -ENOMEM; 377 } 378 379 retval = pci_register_driver(&shpc_driver); 380 dbg("%s: pci_register_driver = %d\n", __func__, retval); 381 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 382 if (retval) { 383 destroy_workqueue(shpchp_ordered_wq); 384 destroy_workqueue(shpchp_wq); 385 } 386 return retval; 387 } 388 389 static void __exit shpcd_cleanup(void) 390 { 391 dbg("unload_shpchpd()\n"); 392 pci_unregister_driver(&shpc_driver); 393 destroy_workqueue(shpchp_ordered_wq); 394 destroy_workqueue(shpchp_wq); 395 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 396 } 397 398 module_init(shpcd_init); 399 module_exit(shpcd_cleanup); 400