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 hp_slot=%x sun=%x slot_device_offset=%x\n", 147 pci_domain_nr(ctrl->pci_dev->subordinate), 148 slot->bus, slot->device, slot->hp_slot, slot->number, 149 ctrl->slot_device_offset); 150 retval = pci_hp_register(slot->hotplug_slot, 151 ctrl->pci_dev->subordinate, slot->device, name); 152 if (retval) { 153 ctrl_err(ctrl, "pci_hp_register failed with error %d\n", 154 retval); 155 goto error_slotwq; 156 } 157 158 get_power_status(hotplug_slot, &info->power_status); 159 get_attention_status(hotplug_slot, &info->attention_status); 160 get_latch_status(hotplug_slot, &info->latch_status); 161 get_adapter_status(hotplug_slot, &info->adapter_status); 162 163 list_add(&slot->slot_list, &ctrl->slot_list); 164 } 165 166 return 0; 167 error_slotwq: 168 destroy_workqueue(slot->wq); 169 error_info: 170 kfree(info); 171 error_hpslot: 172 kfree(hotplug_slot); 173 error_slot: 174 kfree(slot); 175 error: 176 return retval; 177 } 178 179 void cleanup_slots(struct controller *ctrl) 180 { 181 struct list_head *tmp; 182 struct list_head *next; 183 struct slot *slot; 184 185 list_for_each_safe(tmp, next, &ctrl->slot_list) { 186 slot = list_entry(tmp, struct slot, slot_list); 187 list_del(&slot->slot_list); 188 cancel_delayed_work(&slot->work); 189 destroy_workqueue(slot->wq); 190 pci_hp_deregister(slot->hotplug_slot); 191 } 192 } 193 194 /* 195 * set_attention_status - Turns the Amber LED for a slot on, off or blink 196 */ 197 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 198 { 199 struct slot *slot = get_slot(hotplug_slot); 200 201 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 202 __func__, slot_name(slot)); 203 204 hotplug_slot->info->attention_status = status; 205 slot->hpc_ops->set_attention_status(slot, status); 206 207 return 0; 208 } 209 210 static int enable_slot (struct hotplug_slot *hotplug_slot) 211 { 212 struct slot *slot = get_slot(hotplug_slot); 213 214 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 215 __func__, slot_name(slot)); 216 217 return shpchp_sysfs_enable_slot(slot); 218 } 219 220 static int disable_slot (struct hotplug_slot *hotplug_slot) 221 { 222 struct slot *slot = get_slot(hotplug_slot); 223 224 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 225 __func__, slot_name(slot)); 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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 236 __func__, slot_name(slot)); 237 238 retval = slot->hpc_ops->get_power_status(slot, value); 239 if (retval < 0) 240 *value = hotplug_slot->info->power_status; 241 242 return 0; 243 } 244 245 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 246 { 247 struct slot *slot = get_slot(hotplug_slot); 248 int retval; 249 250 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 251 __func__, slot_name(slot)); 252 253 retval = slot->hpc_ops->get_attention_status(slot, value); 254 if (retval < 0) 255 *value = hotplug_slot->info->attention_status; 256 257 return 0; 258 } 259 260 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 261 { 262 struct slot *slot = get_slot(hotplug_slot); 263 int retval; 264 265 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 266 __func__, slot_name(slot)); 267 268 retval = slot->hpc_ops->get_latch_status(slot, value); 269 if (retval < 0) 270 *value = hotplug_slot->info->latch_status; 271 272 return 0; 273 } 274 275 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 276 { 277 struct slot *slot = get_slot(hotplug_slot); 278 int retval; 279 280 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 281 __func__, slot_name(slot)); 282 283 retval = slot->hpc_ops->get_adapter_status(slot, value); 284 if (retval < 0) 285 *value = hotplug_slot->info->adapter_status; 286 287 return 0; 288 } 289 290 static int is_shpc_capable(struct pci_dev *dev) 291 { 292 if (dev->vendor == PCI_VENDOR_ID_AMD && 293 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) 294 return 1; 295 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 296 return 0; 297 if (get_hp_hw_control_from_firmware(dev)) 298 return 0; 299 return 1; 300 } 301 302 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 303 { 304 int rc; 305 struct controller *ctrl; 306 307 if (!is_shpc_capable(pdev)) 308 return -ENODEV; 309 310 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 311 if (!ctrl) { 312 dev_err(&pdev->dev, "%s: Out of memory\n", __func__); 313 goto err_out_none; 314 } 315 INIT_LIST_HEAD(&ctrl->slot_list); 316 317 rc = shpc_init(ctrl, pdev); 318 if (rc) { 319 ctrl_dbg(ctrl, "Controller initialization failed\n"); 320 goto err_out_free_ctrl; 321 } 322 323 pci_set_drvdata(pdev, ctrl); 324 325 /* Setup the slot information structures */ 326 rc = init_slots(ctrl); 327 if (rc) { 328 ctrl_err(ctrl, "Slot initialization failed\n"); 329 goto err_out_release_ctlr; 330 } 331 332 rc = shpchp_create_ctrl_files(ctrl); 333 if (rc) 334 goto err_cleanup_slots; 335 336 return 0; 337 338 err_cleanup_slots: 339 cleanup_slots(ctrl); 340 err_out_release_ctlr: 341 ctrl->hpc_ops->release_ctlr(ctrl); 342 err_out_free_ctrl: 343 kfree(ctrl); 344 err_out_none: 345 return -ENODEV; 346 } 347 348 static void shpc_remove(struct pci_dev *dev) 349 { 350 struct controller *ctrl = pci_get_drvdata(dev); 351 352 shpchp_remove_ctrl_files(ctrl); 353 ctrl->hpc_ops->release_ctlr(ctrl); 354 kfree(ctrl); 355 } 356 357 static struct pci_device_id shpcd_pci_tbl[] = { 358 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 359 { /* end: all zeroes */ } 360 }; 361 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 362 363 static struct pci_driver shpc_driver = { 364 .name = SHPC_MODULE_NAME, 365 .id_table = shpcd_pci_tbl, 366 .probe = shpc_probe, 367 .remove = shpc_remove, 368 }; 369 370 static int __init shpcd_init(void) 371 { 372 int retval; 373 374 retval = pci_register_driver(&shpc_driver); 375 dbg("%s: pci_register_driver = %d\n", __func__, retval); 376 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 377 378 return retval; 379 } 380 381 static void __exit shpcd_cleanup(void) 382 { 383 dbg("unload_shpchpd()\n"); 384 pci_unregister_driver(&shpc_driver); 385 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 386 } 387 388 module_init(shpcd_init); 389 module_exit(shpcd_cleanup); 390