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 43 #define DRIVER_VERSION "0.4" 44 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" 45 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver" 46 47 MODULE_AUTHOR(DRIVER_AUTHOR); 48 MODULE_DESCRIPTION(DRIVER_DESC); 49 MODULE_LICENSE("GPL"); 50 51 module_param(shpchp_debug, bool, 0644); 52 module_param(shpchp_poll_mode, bool, 0644); 53 module_param(shpchp_poll_time, int, 0644); 54 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 55 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 56 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 57 58 #define SHPC_MODULE_NAME "shpchp" 59 60 static int set_attention_status (struct hotplug_slot *slot, u8 value); 61 static int enable_slot (struct hotplug_slot *slot); 62 static int disable_slot (struct hotplug_slot *slot); 63 static int get_power_status (struct hotplug_slot *slot, u8 *value); 64 static int get_attention_status (struct hotplug_slot *slot, u8 *value); 65 static int get_latch_status (struct hotplug_slot *slot, u8 *value); 66 static int get_adapter_status (struct hotplug_slot *slot, u8 *value); 67 68 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 69 .set_attention_status = set_attention_status, 70 .enable_slot = enable_slot, 71 .disable_slot = disable_slot, 72 .get_power_status = get_power_status, 73 .get_attention_status = get_attention_status, 74 .get_latch_status = get_latch_status, 75 .get_adapter_status = get_adapter_status, 76 }; 77 78 /** 79 * release_slot - free up the memory used by a slot 80 * @hotplug_slot: slot to free 81 */ 82 static void release_slot(struct hotplug_slot *hotplug_slot) 83 { 84 struct slot *slot = hotplug_slot->private; 85 86 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 87 __func__, slot_name(slot)); 88 89 kfree(slot->hotplug_slot->info); 90 kfree(slot->hotplug_slot); 91 kfree(slot); 92 } 93 94 static int init_slots(struct controller *ctrl) 95 { 96 struct slot *slot; 97 struct hotplug_slot *hotplug_slot; 98 struct hotplug_slot_info *info; 99 char name[SLOT_NAME_SIZE]; 100 int retval; 101 int i; 102 103 for (i = 0; i < ctrl->num_slots; i++) { 104 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 105 if (!slot) { 106 retval = -ENOMEM; 107 goto error; 108 } 109 110 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 111 if (!hotplug_slot) { 112 retval = -ENOMEM; 113 goto error_slot; 114 } 115 slot->hotplug_slot = hotplug_slot; 116 117 info = kzalloc(sizeof(*info), GFP_KERNEL); 118 if (!info) { 119 retval = -ENOMEM; 120 goto error_hpslot; 121 } 122 hotplug_slot->info = info; 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); 130 131 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number); 132 if (!slot->wq) { 133 retval = -ENOMEM; 134 goto error_info; 135 } 136 137 mutex_init(&slot->lock); 138 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 139 140 /* register this slot with the hotplug pci core */ 141 hotplug_slot->private = slot; 142 hotplug_slot->release = &release_slot; 143 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); 144 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 145 146 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x " 147 "hp_slot=%x sun=%x slot_device_offset=%x\n", 148 pci_domain_nr(ctrl->pci_dev->subordinate), 149 slot->bus, slot->device, slot->hp_slot, slot->number, 150 ctrl->slot_device_offset); 151 retval = pci_hp_register(slot->hotplug_slot, 152 ctrl->pci_dev->subordinate, slot->device, name); 153 if (retval) { 154 ctrl_err(ctrl, "pci_hp_register failed with error %d\n", 155 retval); 156 goto error_slotwq; 157 } 158 159 get_power_status(hotplug_slot, &info->power_status); 160 get_attention_status(hotplug_slot, &info->attention_status); 161 get_latch_status(hotplug_slot, &info->latch_status); 162 get_adapter_status(hotplug_slot, &info->adapter_status); 163 164 list_add(&slot->slot_list, &ctrl->slot_list); 165 } 166 167 return 0; 168 error_slotwq: 169 destroy_workqueue(slot->wq); 170 error_info: 171 kfree(info); 172 error_hpslot: 173 kfree(hotplug_slot); 174 error_slot: 175 kfree(slot); 176 error: 177 return retval; 178 } 179 180 void cleanup_slots(struct controller *ctrl) 181 { 182 struct list_head *tmp; 183 struct list_head *next; 184 struct slot *slot; 185 186 list_for_each_safe(tmp, next, &ctrl->slot_list) { 187 slot = list_entry(tmp, struct slot, slot_list); 188 list_del(&slot->slot_list); 189 cancel_delayed_work(&slot->work); 190 destroy_workqueue(slot->wq); 191 pci_hp_deregister(slot->hotplug_slot); 192 } 193 } 194 195 /* 196 * set_attention_status - Turns the Amber LED for a slot on, off or blink 197 */ 198 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 199 { 200 struct slot *slot = get_slot(hotplug_slot); 201 202 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 203 __func__, slot_name(slot)); 204 205 hotplug_slot->info->attention_status = status; 206 slot->hpc_ops->set_attention_status(slot, status); 207 208 return 0; 209 } 210 211 static int enable_slot (struct hotplug_slot *hotplug_slot) 212 { 213 struct slot *slot = get_slot(hotplug_slot); 214 215 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 216 __func__, slot_name(slot)); 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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 226 __func__, slot_name(slot)); 227 228 return shpchp_sysfs_disable_slot(slot); 229 } 230 231 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 232 { 233 struct slot *slot = get_slot(hotplug_slot); 234 int retval; 235 236 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 237 __func__, slot_name(slot)); 238 239 retval = slot->hpc_ops->get_power_status(slot, value); 240 if (retval < 0) 241 *value = hotplug_slot->info->power_status; 242 243 return 0; 244 } 245 246 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 247 { 248 struct slot *slot = get_slot(hotplug_slot); 249 int retval; 250 251 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 252 __func__, slot_name(slot)); 253 254 retval = slot->hpc_ops->get_attention_status(slot, value); 255 if (retval < 0) 256 *value = hotplug_slot->info->attention_status; 257 258 return 0; 259 } 260 261 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 262 { 263 struct slot *slot = get_slot(hotplug_slot); 264 int retval; 265 266 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 267 __func__, slot_name(slot)); 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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 282 __func__, slot_name(slot)); 283 284 retval = slot->hpc_ops->get_adapter_status(slot, value); 285 if (retval < 0) 286 *value = hotplug_slot->info->adapter_status; 287 288 return 0; 289 } 290 291 static int is_shpc_capable(struct pci_dev *dev) 292 { 293 if (dev->vendor == PCI_VENDOR_ID_AMD && 294 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) 295 return 1; 296 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 297 return 0; 298 if (get_hp_hw_control_from_firmware(dev)) 299 return 0; 300 return 1; 301 } 302 303 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 304 { 305 int rc; 306 struct controller *ctrl; 307 308 if (!is_shpc_capable(pdev)) 309 return -ENODEV; 310 311 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 312 if (!ctrl) { 313 dev_err(&pdev->dev, "%s: Out of memory\n", __func__); 314 goto err_out_none; 315 } 316 INIT_LIST_HEAD(&ctrl->slot_list); 317 318 rc = shpc_init(ctrl, pdev); 319 if (rc) { 320 ctrl_dbg(ctrl, "Controller initialization failed\n"); 321 goto err_out_free_ctrl; 322 } 323 324 pci_set_drvdata(pdev, ctrl); 325 326 /* Setup the slot information structures */ 327 rc = init_slots(ctrl); 328 if (rc) { 329 ctrl_err(ctrl, "Slot initialization failed\n"); 330 goto err_out_release_ctlr; 331 } 332 333 rc = shpchp_create_ctrl_files(ctrl); 334 if (rc) 335 goto err_cleanup_slots; 336 337 return 0; 338 339 err_cleanup_slots: 340 cleanup_slots(ctrl); 341 err_out_release_ctlr: 342 ctrl->hpc_ops->release_ctlr(ctrl); 343 err_out_free_ctrl: 344 kfree(ctrl); 345 err_out_none: 346 return -ENODEV; 347 } 348 349 static void shpc_remove(struct pci_dev *dev) 350 { 351 struct controller *ctrl = pci_get_drvdata(dev); 352 353 shpchp_remove_ctrl_files(ctrl); 354 ctrl->hpc_ops->release_ctlr(ctrl); 355 kfree(ctrl); 356 } 357 358 static struct pci_device_id shpcd_pci_tbl[] = { 359 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 360 { /* end: all zeroes */ } 361 }; 362 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 363 364 static struct pci_driver shpc_driver = { 365 .name = SHPC_MODULE_NAME, 366 .id_table = shpcd_pci_tbl, 367 .probe = shpc_probe, 368 .remove = shpc_remove, 369 }; 370 371 static int __init shpcd_init(void) 372 { 373 int retval; 374 375 retval = pci_register_driver(&shpc_driver); 376 dbg("%s: pci_register_driver = %d\n", __func__, retval); 377 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 378 379 return retval; 380 } 381 382 static void __exit shpcd_cleanup(void) 383 { 384 dbg("unload_shpchpd()\n"); 385 pci_unregister_driver(&shpc_driver); 386 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 387 } 388 389 module_init(shpcd_init); 390 module_exit(shpcd_cleanup); 391