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 slot *slot, *next; 182 183 list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) { 184 list_del(&slot->slot_list); 185 cancel_delayed_work(&slot->work); 186 destroy_workqueue(slot->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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 199 __func__, slot_name(slot)); 200 201 hotplug_slot->info->attention_status = status; 202 slot->hpc_ops->set_attention_status(slot, status); 203 204 return 0; 205 } 206 207 static int enable_slot(struct hotplug_slot *hotplug_slot) 208 { 209 struct slot *slot = get_slot(hotplug_slot); 210 211 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 212 __func__, slot_name(slot)); 213 214 return shpchp_sysfs_enable_slot(slot); 215 } 216 217 static int disable_slot(struct hotplug_slot *hotplug_slot) 218 { 219 struct slot *slot = get_slot(hotplug_slot); 220 221 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 222 __func__, slot_name(slot)); 223 224 return shpchp_sysfs_disable_slot(slot); 225 } 226 227 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 228 { 229 struct slot *slot = get_slot(hotplug_slot); 230 int retval; 231 232 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 233 __func__, slot_name(slot)); 234 235 retval = slot->hpc_ops->get_power_status(slot, value); 236 if (retval < 0) 237 *value = hotplug_slot->info->power_status; 238 239 return 0; 240 } 241 242 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 243 { 244 struct slot *slot = get_slot(hotplug_slot); 245 int retval; 246 247 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 248 __func__, slot_name(slot)); 249 250 retval = slot->hpc_ops->get_attention_status(slot, value); 251 if (retval < 0) 252 *value = hotplug_slot->info->attention_status; 253 254 return 0; 255 } 256 257 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) 258 { 259 struct slot *slot = get_slot(hotplug_slot); 260 int retval; 261 262 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 263 __func__, slot_name(slot)); 264 265 retval = slot->hpc_ops->get_latch_status(slot, value); 266 if (retval < 0) 267 *value = hotplug_slot->info->latch_status; 268 269 return 0; 270 } 271 272 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 273 { 274 struct slot *slot = get_slot(hotplug_slot); 275 int retval; 276 277 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 278 __func__, slot_name(slot)); 279 280 retval = slot->hpc_ops->get_adapter_status(slot, value); 281 if (retval < 0) 282 *value = hotplug_slot->info->adapter_status; 283 284 return 0; 285 } 286 287 static int is_shpc_capable(struct pci_dev *dev) 288 { 289 if (dev->vendor == PCI_VENDOR_ID_AMD && 290 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) 291 return 1; 292 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 293 return 0; 294 if (get_hp_hw_control_from_firmware(dev)) 295 return 0; 296 return 1; 297 } 298 299 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 300 { 301 int rc; 302 struct controller *ctrl; 303 304 if (!is_shpc_capable(pdev)) 305 return -ENODEV; 306 307 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 308 if (!ctrl) { 309 dev_err(&pdev->dev, "%s: Out of memory\n", __func__); 310 goto err_out_none; 311 } 312 INIT_LIST_HEAD(&ctrl->slot_list); 313 314 rc = shpc_init(ctrl, pdev); 315 if (rc) { 316 ctrl_dbg(ctrl, "Controller initialization failed\n"); 317 goto err_out_free_ctrl; 318 } 319 320 pci_set_drvdata(pdev, ctrl); 321 322 /* Setup the slot information structures */ 323 rc = init_slots(ctrl); 324 if (rc) { 325 ctrl_err(ctrl, "Slot initialization failed\n"); 326 goto err_out_release_ctlr; 327 } 328 329 rc = shpchp_create_ctrl_files(ctrl); 330 if (rc) 331 goto err_cleanup_slots; 332 333 return 0; 334 335 err_cleanup_slots: 336 cleanup_slots(ctrl); 337 err_out_release_ctlr: 338 ctrl->hpc_ops->release_ctlr(ctrl); 339 err_out_free_ctrl: 340 kfree(ctrl); 341 err_out_none: 342 return -ENODEV; 343 } 344 345 static void shpc_remove(struct pci_dev *dev) 346 { 347 struct controller *ctrl = pci_get_drvdata(dev); 348 349 shpchp_remove_ctrl_files(ctrl); 350 ctrl->hpc_ops->release_ctlr(ctrl); 351 kfree(ctrl); 352 } 353 354 static struct pci_device_id shpcd_pci_tbl[] = { 355 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 356 { /* end: all zeroes */ } 357 }; 358 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 359 360 static struct pci_driver shpc_driver = { 361 .name = SHPC_MODULE_NAME, 362 .id_table = shpcd_pci_tbl, 363 .probe = shpc_probe, 364 .remove = shpc_remove, 365 }; 366 367 static int __init shpcd_init(void) 368 { 369 int retval; 370 371 retval = pci_register_driver(&shpc_driver); 372 dbg("%s: pci_register_driver = %d\n", __func__, retval); 373 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 374 375 return retval; 376 } 377 378 static void __exit shpcd_cleanup(void) 379 { 380 dbg("unload_shpchpd()\n"); 381 pci_unregister_driver(&shpc_driver); 382 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 383 } 384 385 module_init(shpcd_init); 386 module_exit(shpcd_cleanup); 387