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 */ 39bool shpchp_debug; 40bool shpchp_poll_mode; 41int shpchp_poll_time; 42struct workqueue_struct *shpchp_wq; 43struct 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 49MODULE_AUTHOR(DRIVER_AUTHOR); 50MODULE_DESCRIPTION(DRIVER_DESC); 51MODULE_LICENSE("GPL"); 52 53module_param(shpchp_debug, bool, 0644); 54module_param(shpchp_poll_mode, bool, 0644); 55module_param(shpchp_poll_time, int, 0644); 56MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 57MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 58MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 59 60#define SHPC_MODULE_NAME "shpchp" 61 62static int set_attention_status (struct hotplug_slot *slot, u8 value); 63static int enable_slot (struct hotplug_slot *slot); 64static int disable_slot (struct hotplug_slot *slot); 65static int get_power_status (struct hotplug_slot *slot, u8 *value); 66static int get_attention_status (struct hotplug_slot *slot, u8 *value); 67static int get_latch_status (struct hotplug_slot *slot, u8 *value); 68static int get_adapter_status (struct hotplug_slot *slot, u8 *value); 69 70static 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 */ 84static 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 96static 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 = -ENOMEM; 103 int i; 104 105 for (i = 0; i < ctrl->num_slots; i++) { 106 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 107 if (!slot) 108 goto error; 109 110 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); 111 if (!hotplug_slot) 112 goto error_slot; 113 slot->hotplug_slot = hotplug_slot; 114 115 info = kzalloc(sizeof(*info), GFP_KERNEL); 116 if (!info) 117 goto error_hpslot; 118 hotplug_slot->info = info; 119 120 slot->hp_slot = i; 121 slot->ctrl = ctrl; 122 slot->bus = ctrl->pci_dev->subordinate->number; 123 slot->device = ctrl->slot_device_offset + i; 124 slot->hpc_ops = ctrl->hpc_ops; 125 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 126 mutex_init(&slot->lock); 127 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 128 129 /* register this slot with the hotplug pci core */ 130 hotplug_slot->private = slot; 131 hotplug_slot->release = &release_slot; 132 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); 133 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 134 135 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x " 136 "hp_slot=%x sun=%x slot_device_offset=%x\n", 137 pci_domain_nr(ctrl->pci_dev->subordinate), 138 slot->bus, slot->device, slot->hp_slot, slot->number, 139 ctrl->slot_device_offset); 140 retval = pci_hp_register(slot->hotplug_slot, 141 ctrl->pci_dev->subordinate, slot->device, name); 142 if (retval) { 143 ctrl_err(ctrl, "pci_hp_register failed with error %d\n", 144 retval); 145 goto error_info; 146 } 147 148 get_power_status(hotplug_slot, &info->power_status); 149 get_attention_status(hotplug_slot, &info->attention_status); 150 get_latch_status(hotplug_slot, &info->latch_status); 151 get_adapter_status(hotplug_slot, &info->adapter_status); 152 153 list_add(&slot->slot_list, &ctrl->slot_list); 154 } 155 156 return 0; 157error_info: 158 kfree(info); 159error_hpslot: 160 kfree(hotplug_slot); 161error_slot: 162 kfree(slot); 163error: 164 return retval; 165} 166 167void cleanup_slots(struct controller *ctrl) 168{ 169 struct list_head *tmp; 170 struct list_head *next; 171 struct slot *slot; 172 173 list_for_each_safe(tmp, next, &ctrl->slot_list) { 174 slot = list_entry(tmp, struct slot, slot_list); 175 list_del(&slot->slot_list); 176 cancel_delayed_work(&slot->work); 177 flush_workqueue(shpchp_wq); 178 flush_workqueue(shpchp_ordered_wq); 179 pci_hp_deregister(slot->hotplug_slot); 180 } 181} 182 183/* 184 * set_attention_status - Turns the Amber LED for a slot on, off or blink 185 */ 186static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status) 187{ 188 struct slot *slot = get_slot(hotplug_slot); 189 190 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 191 __func__, slot_name(slot)); 192 193 hotplug_slot->info->attention_status = status; 194 slot->hpc_ops->set_attention_status(slot, status); 195 196 return 0; 197} 198 199static int enable_slot (struct hotplug_slot *hotplug_slot) 200{ 201 struct slot *slot = get_slot(hotplug_slot); 202 203 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 204 __func__, slot_name(slot)); 205 206 return shpchp_sysfs_enable_slot(slot); 207} 208 209static int disable_slot (struct hotplug_slot *hotplug_slot) 210{ 211 struct slot *slot = get_slot(hotplug_slot); 212 213 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 214 __func__, slot_name(slot)); 215 216 return shpchp_sysfs_disable_slot(slot); 217} 218 219static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value) 220{ 221 struct slot *slot = get_slot(hotplug_slot); 222 int retval; 223 224 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 225 __func__, slot_name(slot)); 226 227 retval = slot->hpc_ops->get_power_status(slot, value); 228 if (retval < 0) 229 *value = hotplug_slot->info->power_status; 230 231 return 0; 232} 233 234static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value) 235{ 236 struct slot *slot = get_slot(hotplug_slot); 237 int retval; 238 239 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 240 __func__, slot_name(slot)); 241 242 retval = slot->hpc_ops->get_attention_status(slot, value); 243 if (retval < 0) 244 *value = hotplug_slot->info->attention_status; 245 246 return 0; 247} 248 249static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value) 250{ 251 struct slot *slot = get_slot(hotplug_slot); 252 int retval; 253 254 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 255 __func__, slot_name(slot)); 256 257 retval = slot->hpc_ops->get_latch_status(slot, value); 258 if (retval < 0) 259 *value = hotplug_slot->info->latch_status; 260 261 return 0; 262} 263 264static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value) 265{ 266 struct slot *slot = get_slot(hotplug_slot); 267 int retval; 268 269 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 270 __func__, slot_name(slot)); 271 272 retval = slot->hpc_ops->get_adapter_status(slot, value); 273 if (retval < 0) 274 *value = hotplug_slot->info->adapter_status; 275 276 return 0; 277} 278 279static int is_shpc_capable(struct pci_dev *dev) 280{ 281 if (dev->vendor == PCI_VENDOR_ID_AMD && 282 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) 283 return 1; 284 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC)) 285 return 0; 286 if (get_hp_hw_control_from_firmware(dev)) 287 return 0; 288 return 1; 289} 290 291static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 292{ 293 int rc; 294 struct controller *ctrl; 295 296 if (!is_shpc_capable(pdev)) 297 return -ENODEV; 298 299 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 300 if (!ctrl) { 301 dev_err(&pdev->dev, "%s: Out of memory\n", __func__); 302 goto err_out_none; 303 } 304 INIT_LIST_HEAD(&ctrl->slot_list); 305 306 rc = shpc_init(ctrl, pdev); 307 if (rc) { 308 ctrl_dbg(ctrl, "Controller initialization failed\n"); 309 goto err_out_free_ctrl; 310 } 311 312 pci_set_drvdata(pdev, ctrl); 313 314 /* Setup the slot information structures */ 315 rc = init_slots(ctrl); 316 if (rc) { 317 ctrl_err(ctrl, "Slot initialization failed\n"); 318 goto err_out_release_ctlr; 319 } 320 321 rc = shpchp_create_ctrl_files(ctrl); 322 if (rc) 323 goto err_cleanup_slots; 324 325 return 0; 326 327err_cleanup_slots: 328 cleanup_slots(ctrl); 329err_out_release_ctlr: 330 ctrl->hpc_ops->release_ctlr(ctrl); 331err_out_free_ctrl: 332 kfree(ctrl); 333err_out_none: 334 return -ENODEV; 335} 336 337static void shpc_remove(struct pci_dev *dev) 338{ 339 struct controller *ctrl = pci_get_drvdata(dev); 340 341 shpchp_remove_ctrl_files(ctrl); 342 ctrl->hpc_ops->release_ctlr(ctrl); 343 kfree(ctrl); 344} 345 346static struct pci_device_id shpcd_pci_tbl[] = { 347 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, 348 { /* end: all zeroes */ } 349}; 350MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 351 352static struct pci_driver shpc_driver = { 353 .name = SHPC_MODULE_NAME, 354 .id_table = shpcd_pci_tbl, 355 .probe = shpc_probe, 356 .remove = shpc_remove, 357}; 358 359static int __init shpcd_init(void) 360{ 361 int retval = 0; 362 363 shpchp_wq = alloc_ordered_workqueue("shpchp", 0); 364 if (!shpchp_wq) 365 return -ENOMEM; 366 367 shpchp_ordered_wq = alloc_ordered_workqueue("shpchp_ordered", 0); 368 if (!shpchp_ordered_wq) { 369 destroy_workqueue(shpchp_wq); 370 return -ENOMEM; 371 } 372 373 retval = pci_register_driver(&shpc_driver); 374 dbg("%s: pci_register_driver = %d\n", __func__, retval); 375 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 376 if (retval) { 377 destroy_workqueue(shpchp_ordered_wq); 378 destroy_workqueue(shpchp_wq); 379 } 380 return retval; 381} 382 383static void __exit shpcd_cleanup(void) 384{ 385 dbg("unload_shpchpd()\n"); 386 pci_unregister_driver(&shpc_driver); 387 destroy_workqueue(shpchp_ordered_wq); 388 destroy_workqueue(shpchp_wq); 389 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); 390} 391 392module_init(shpcd_init); 393module_exit(shpcd_cleanup); 394