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