drivers/pci/hotplug/pciehp_core.c

   1 /*
   2  * PCI Express 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/pci.h>
  35 #include "pciehp.h"
  36 #include <linux/interrupt.h>
  37 #include <linux/time.h>
  38
  39 /* Global variables */
  40 int pciehp_debug;
  41 int pciehp_poll_mode;
  42 int pciehp_poll_time;
  43 int pciehp_force;
  44 int pciehp_slot_with_bus;
  45 struct workqueue_struct *pciehp_wq;
  46
  47 #define DRIVER_VERSION  "0.4"
  48 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
  49 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
  50
  51 MODULE_AUTHOR(DRIVER_AUTHOR);
  52 MODULE_DESCRIPTION(DRIVER_DESC);
  53 MODULE_LICENSE("GPL");
  54
  55 module_param(pciehp_debug, bool, 0644);
  56 module_param(pciehp_poll_mode, bool, 0644);
  57 module_param(pciehp_poll_time, int, 0644);
  58 module_param(pciehp_force, bool, 0644);
  59 module_param(pciehp_slot_with_bus, bool, 0644);
  60 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  61 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  62 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  63 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
  64 MODULE_PARM_DESC(pciehp_slot_with_bus, "Use bus number in the slot name");
  65
  66 #define PCIE_MODULE_NAME "pciehp"
  67
  68 static int set_attention_status (struct hotplug_slot *slot, u8 value);
  69 static int enable_slot          (struct hotplug_slot *slot);
  70 static int disable_slot         (struct hotplug_slot *slot);
  71 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
  72 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
  73 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
  74 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
  75 static int get_address          (struct hotplug_slot *slot, u32 *value);
  76 static int get_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  77 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  78
  79 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
  80         .owner =                THIS_MODULE,
  81         .set_attention_status = set_attention_status,
  82         .enable_slot =          enable_slot,
  83         .disable_slot =         disable_slot,
  84         .get_power_status =     get_power_status,
  85         .get_attention_status = get_attention_status,
  86         .get_latch_status =     get_latch_status,
  87         .get_adapter_status =   get_adapter_status,
  88         .get_address =          get_address,
  89         .get_max_bus_speed =    get_max_bus_speed,
  90         .get_cur_bus_speed =    get_cur_bus_speed,
  91 };
  92
  93 /*
  94  * Check the status of the Electro Mechanical Interlock (EMI)
  95  */
  96 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
  97 {
  98         struct slot *slot = hotplug_slot->private;
  99         return (slot->hpc_ops->get_emi_status(slot, value));
 100 }
 101
 102 /*
 103  * sysfs interface for the Electro Mechanical Interlock (EMI)
 104  * 1 == locked, 0 == unlocked
 105  */
 106 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
 107 {
 108         int retval;
 109         u8 value;
 110
 111         retval = get_lock_status(slot, &value);
 112         if (retval)
 113                 goto lock_read_exit;
 114         retval = sprintf (buf, "%d\n", value);
 115
 116 lock_read_exit:
 117         return retval;
 118 }
 119
 120 /*
 121  * Change the status of the Electro Mechanical Interlock (EMI)
 122  * This is a toggle - in addition there must be at least 1 second
 123  * in between toggles.
 124  */
 125 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
 126 {
 127         struct slot *slot = hotplug_slot->private;
 128         int retval;
 129         u8 value;
 130
 131         mutex_lock(&slot->ctrl->crit_sect);
 132
 133         /* has it been >1 sec since our last toggle? */
 134         if ((get_seconds() - slot->last_emi_toggle) < 1)
 135                 return -EINVAL;
 136
 137         /* see what our current state is */
 138         retval = get_lock_status(hotplug_slot, &value);
 139         if (retval || (value == status))
 140                 goto set_lock_exit;
 141
 142         slot->hpc_ops->toggle_emi(slot);
 143 set_lock_exit:
 144         mutex_unlock(&slot->ctrl->crit_sect);
 145         return 0;
 146 }
 147
 148 /*
 149  * sysfs interface which allows the user to toggle the Electro Mechanical
 150  * Interlock.  Valid values are either 0 or 1.  0 == unlock, 1 == lock
 151  */
 152 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
 153                 size_t count)
 154 {
 155         unsigned long llock;
 156         u8 lock;
 157         int retval = 0;
 158
 159         llock = simple_strtoul(buf, NULL, 10);
 160         lock = (u8)(llock & 0xff);
 161
 162         switch (lock) {
 163                 case 0:
 164                 case 1:
 165                         retval = set_lock_status(slot, lock);
 166                         break;
 167                 default:
 168                         err ("%d is an invalid lock value\n", lock);
 169                         retval = -EINVAL;
 170         }
 171         if (retval)
 172                 return retval;
 173         return count;
 174 }
 175
 176 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
 177         .attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 178         .show = lock_read_file,
 179         .store = lock_write_file
 180 };
 181
 182 /**
 183  * release_slot - free up the memory used by a slot
 184  * @hotplug_slot: slot to free
 185  */
 186 static void release_slot(struct hotplug_slot *hotplug_slot)
 187 {
 188         struct slot *slot = hotplug_slot->private;
 189
 190         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 191
 192         kfree(slot->hotplug_slot->info);
 193         kfree(slot->hotplug_slot);
 194         kfree(slot);
 195 }
 196
 197 static void make_slot_name(struct slot *slot)
 198 {
 199         if (pciehp_slot_with_bus)
 200                 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
 201                          slot->bus, slot->number);
 202         else
 203                 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d",
 204                          slot->number);
 205 }
 206
 207 static int init_slots(struct controller *ctrl)
 208 {
 209         struct slot *slot;
 210         struct hotplug_slot *hotplug_slot;
 211         struct hotplug_slot_info *info;
 212         int retval = -ENOMEM;
 213         int i;
 214
 215         for (i = 0; i < ctrl->num_slots; i++) {
 216                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 217                 if (!slot)
 218                         goto error;
 219
 220                 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 221                 if (!hotplug_slot)
 222                         goto error_slot;
 223                 slot->hotplug_slot = hotplug_slot;
 224
 225                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 226                 if (!info)
 227                         goto error_hpslot;
 228                 hotplug_slot->info = info;
 229
 230                 hotplug_slot->name = slot->name;
 231
 232                 slot->hp_slot = i;
 233                 slot->ctrl = ctrl;
 234                 slot->bus = ctrl->pci_dev->subordinate->number;
 235                 slot->device = ctrl->slot_device_offset + i;
 236                 slot->hpc_ops = ctrl->hpc_ops;
 237                 slot->number = ctrl->first_slot;
 238                 mutex_init(&slot->lock);
 239                 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
 240
 241                 /* register this slot with the hotplug pci core */
 242                 hotplug_slot->private = slot;
 243                 hotplug_slot->release = &release_slot;
 244                 make_slot_name(slot);
 245                 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 246
 247                 get_power_status(hotplug_slot, &info->power_status);
 248                 get_attention_status(hotplug_slot, &info->attention_status);
 249                 get_latch_status(hotplug_slot, &info->latch_status);
 250                 get_adapter_status(hotplug_slot, &info->adapter_status);
 251
 252                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 253                     "slot_device_offset=%x\n", slot->bus, slot->device,
 254                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
 255                 retval = pci_hp_register(hotplug_slot);
 256                 if (retval) {
 257                         err ("pci_hp_register failed with error %d\n", retval);
 258                         goto error_info;
 259                 }
 260                 /* create additional sysfs entries */
 261                 if (EMI(ctrl)) {
 262                         retval = sysfs_create_file(&hotplug_slot->kobj,
 263                                 &hotplug_slot_attr_lock.attr);
 264                         if (retval) {
 265                                 pci_hp_deregister(hotplug_slot);
 266                                 err("cannot create additional sysfs entries\n");
 267                                 goto error_info;
 268                         }
 269                 }
 270
 271                 list_add(&slot->slot_list, &ctrl->slot_list);
 272         }
 273
 274         return 0;
 275 error_info:
 276         kfree(info);
 277 error_hpslot:
 278         kfree(hotplug_slot);
 279 error_slot:
 280         kfree(slot);
 281 error:
 282         return retval;
 283 }
 284
 285 static void cleanup_slots(struct controller *ctrl)
 286 {
 287         struct list_head *tmp;
 288         struct list_head *next;
 289         struct slot *slot;
 290
 291         list_for_each_safe(tmp, next, &ctrl->slot_list) {
 292                 slot = list_entry(tmp, struct slot, slot_list);
 293                 list_del(&slot->slot_list);
 294                 if (EMI(ctrl))
 295                         sysfs_remove_file(&slot->hotplug_slot->kobj,
 296                                 &hotplug_slot_attr_lock.attr);
 297                 cancel_delayed_work(&slot->work);
 298                 flush_scheduled_work();
 299                 flush_workqueue(pciehp_wq);
 300                 pci_hp_deregister(slot->hotplug_slot);
 301         }
 302 }
 303
 304 /*
 305  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 306  */
 307 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 308 {
 309         struct slot *slot = hotplug_slot->private;
 310
 311         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 312
 313         hotplug_slot->info->attention_status = status;
 314
 315         if (ATTN_LED(slot->ctrl))
 316                 slot->hpc_ops->set_attention_status(slot, status);
 317
 318         return 0;
 319 }
 320
 321
 322 static int enable_slot(struct hotplug_slot *hotplug_slot)
 323 {
 324         struct slot *slot = hotplug_slot->private;
 325
 326         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 327
 328         return pciehp_sysfs_enable_slot(slot);
 329 }
 330
 331
 332 static int disable_slot(struct hotplug_slot *hotplug_slot)
 333 {
 334         struct slot *slot = hotplug_slot->private;
 335
 336         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 337
 338         return pciehp_sysfs_disable_slot(slot);
 339 }
 340
 341 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 342 {
 343         struct slot *slot = hotplug_slot->private;
 344         int retval;
 345
 346         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 347
 348         retval = slot->hpc_ops->get_power_status(slot, value);
 349         if (retval < 0)
 350                 *value = hotplug_slot->info->power_status;
 351
 352         return 0;
 353 }
 354
 355 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 356 {
 357         struct slot *slot = hotplug_slot->private;
 358         int retval;
 359
 360         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 361
 362         retval = slot->hpc_ops->get_attention_status(slot, value);
 363         if (retval < 0)
 364                 *value = hotplug_slot->info->attention_status;
 365
 366         return 0;
 367 }
 368
 369 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 370 {
 371         struct slot *slot = hotplug_slot->private;
 372         int retval;
 373
 374         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 375
 376         retval = slot->hpc_ops->get_latch_status(slot, value);
 377         if (retval < 0)
 378                 *value = hotplug_slot->info->latch_status;
 379
 380         return 0;
 381 }
 382
 383 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 384 {
 385         struct slot *slot = hotplug_slot->private;
 386         int retval;
 387
 388         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 389
 390         retval = slot->hpc_ops->get_adapter_status(slot, value);
 391         if (retval < 0)
 392                 *value = hotplug_slot->info->adapter_status;
 393
 394         return 0;
 395 }
 396
 397 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
 398 {
 399         struct slot *slot = hotplug_slot->private;
 400         struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
 401
 402         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 403
 404         *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
 405
 406         return 0;
 407 }
 408
 409 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 410 {
 411         struct slot *slot = hotplug_slot->private;
 412         int retval;
 413
 414         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 415
 416         retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 417         if (retval < 0)
 418                 *value = PCI_SPEED_UNKNOWN;
 419
 420         return 0;
 421 }
 422
 423 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 424 {
 425         struct slot *slot = hotplug_slot->private;
 426         int retval;
 427
 428         dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
 429
 430         retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 431         if (retval < 0)
 432                 *value = PCI_SPEED_UNKNOWN;
 433
 434         return 0;
 435 }
 436
 437 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
 438 {
 439         int rc;
 440         struct controller *ctrl;
 441         struct slot *t_slot;
 442         u8 value;
 443         struct pci_dev *pdev;
 444
 445         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 446         if (!ctrl) {
 447                 err("%s : out of memory\n", __func__);
 448                 goto err_out_none;
 449         }
 450         INIT_LIST_HEAD(&ctrl->slot_list);
 451
 452         pdev = dev->port;
 453         ctrl->pci_dev = pdev;
 454
 455         rc = pcie_init(ctrl, dev);
 456         if (rc) {
 457                 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
 458                 goto err_out_free_ctrl;
 459         }
 460
 461         pci_set_drvdata(pdev, ctrl);
 462
 463         dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
 464             __func__, pdev->bus->number, PCI_SLOT(pdev->devfn),
 465             PCI_FUNC(pdev->devfn), pdev->irq);
 466
 467         /* Setup the slot information structures */
 468         rc = init_slots(ctrl);
 469         if (rc) {
 470                 err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
 471                 goto err_out_release_ctlr;
 472         }
 473
 474         t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 475
 476         t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
 477         if (value && pciehp_force) {
 478                 rc = pciehp_enable_slot(t_slot);
 479                 if (rc) /* -ENODEV: shouldn't happen, but deal with it */
 480                         value = 0;
 481         }
 482         if ((POWER_CTRL(ctrl)) && !value) {
 483                 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
 484                 if (rc)
 485                         goto err_out_free_ctrl_slot;
 486         }
 487
 488         return 0;
 489
 490 err_out_free_ctrl_slot:
 491         cleanup_slots(ctrl);
 492 err_out_release_ctlr:
 493         ctrl->hpc_ops->release_ctlr(ctrl);
 494 err_out_free_ctrl:
 495         kfree(ctrl);
 496 err_out_none:
 497         return -ENODEV;
 498 }
 499
 500 static void pciehp_remove (struct pcie_device *dev)
 501 {
 502         struct pci_dev *pdev = dev->port;
 503         struct controller *ctrl = pci_get_drvdata(pdev);
 504
 505         cleanup_slots(ctrl);
 506         ctrl->hpc_ops->release_ctlr(ctrl);
 507         kfree(ctrl);
 508 }
 509
 510 #ifdef CONFIG_PM
 511 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
 512 {
 513         printk("%s ENTRY\n", __func__);
 514         return 0;
 515 }
 516
 517 static int pciehp_resume (struct pcie_device *dev)
 518 {
 519         printk("%s ENTRY\n", __func__);
 520         if (pciehp_force) {
 521                 struct pci_dev *pdev = dev->port;
 522                 struct controller *ctrl = pci_get_drvdata(pdev);
 523                 struct slot *t_slot;
 524                 u8 status;
 525
 526                 /* reinitialize the chipset's event detection logic */
 527                 pcie_init_hardware_part2(ctrl, dev);
 528
 529                 t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
 530
 531                 /* Check if slot is occupied */
 532                 t_slot->hpc_ops->get_adapter_status(t_slot, &status);
 533                 if (status)
 534                         pciehp_enable_slot(t_slot);
 535                 else
 536                         pciehp_disable_slot(t_slot);
 537         }
 538         return 0;
 539 }
 540 #endif
 541
 542 static struct pcie_port_service_id port_pci_ids[] = { {
 543         .vendor = PCI_ANY_ID,
 544         .device = PCI_ANY_ID,
 545         .port_type = PCIE_ANY_PORT,
 546         .service_type = PCIE_PORT_SERVICE_HP,
 547         .driver_data =  0,
 548         }, { /* end: all zeroes */ }
 549 };
 550 static const char device_name[] = "hpdriver";
 551
 552 static struct pcie_port_service_driver hpdriver_portdrv = {
 553         .name           = (char *)device_name,
 554         .id_table       = &port_pci_ids[0],
 555
 556         .probe          = pciehp_probe,
 557         .remove         = pciehp_remove,
 558
 559 #ifdef  CONFIG_PM
 560         .suspend        = pciehp_suspend,
 561         .resume         = pciehp_resume,
 562 #endif  /* PM */
 563 };
 564
 565 static int __init pcied_init(void)
 566 {
 567         int retval = 0;
 568
 569         retval = pcie_port_service_register(&hpdriver_portdrv);
 570         dbg("pcie_port_service_register = %d\n", retval);
 571         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 572         if (retval)
 573                 dbg("%s: Failure to register service\n", __func__);
 574         return retval;
 575 }
 576
 577 static void __exit pcied_cleanup(void)
 578 {
 579         dbg("unload_pciehpd()\n");
 580         pcie_port_service_unregister(&hpdriver_portdrv);
 581         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 582 }
 583
 584 module_init(pcied_init);
 585 module_exit(pcied_cleanup);