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
  38 /* Global variables */
  39 int pciehp_debug;
  40 int pciehp_poll_mode;
  41 int pciehp_poll_time;
  42 int pciehp_force;
  43 struct controller *pciehp_ctrl_list;
  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     "PCI Express Hot Plug Controller Driver"
  48
  49 MODULE_AUTHOR(DRIVER_AUTHOR);
  50 MODULE_DESCRIPTION(DRIVER_DESC);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(pciehp_debug, bool, 0644);
  54 module_param(pciehp_poll_mode, bool, 0644);
  55 module_param(pciehp_poll_time, int, 0644);
  56 module_param(pciehp_force, bool, 0644);
  57 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
  58 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
  59 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
  60 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
  61
  62 #define PCIE_MODULE_NAME "pciehp"
  63
  64 static int pcie_start_thread (void);
  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_max_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  73 static int get_cur_bus_speed    (struct hotplug_slot *slot, enum pci_bus_speed *value);
  74
  75 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
  76         .owner =                THIS_MODULE,
  77         .set_attention_status = set_attention_status,
  78         .enable_slot =          enable_slot,
  79         .disable_slot =         disable_slot,
  80         .get_power_status =     get_power_status,
  81         .get_attention_status = get_attention_status,
  82         .get_latch_status =     get_latch_status,
  83         .get_adapter_status =   get_adapter_status,
  84         .get_max_bus_speed =    get_max_bus_speed,
  85         .get_cur_bus_speed =    get_cur_bus_speed,
  86 };
  87
  88 /**
  89  * release_slot - free up the memory used by a slot
  90  * @hotplug_slot: slot to free
  91  */
  92 static void release_slot(struct hotplug_slot *hotplug_slot)
  93 {
  94         struct slot *slot = hotplug_slot->private;
  95
  96         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
  97
  98         kfree(slot->hotplug_slot->info);
  99         kfree(slot->hotplug_slot->name);
 100         kfree(slot->hotplug_slot);
 101         kfree(slot);
 102 }
 103
 104 static int init_slots(struct controller *ctrl)
 105 {
 106         struct slot *slot;
 107         struct hpc_ops *hpc_ops;
 108         struct hotplug_slot *hotplug_slot;
 109         struct hotplug_slot_info *hotplug_slot_info;
 110         u8 number_of_slots;
 111         u8 slot_device;
 112         u32 slot_number;
 113         int result = -ENOMEM;
 114
 115         number_of_slots = ctrl->num_slots;
 116         slot_device = ctrl->slot_device_offset;
 117         slot_number = ctrl->first_slot;
 118
 119         while (number_of_slots) {
 120                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 121                 if (!slot)
 122                         goto error;
 123
 124                 slot->hotplug_slot =
 125                                 kzalloc(sizeof(*(slot->hotplug_slot)),
 126                                                 GFP_KERNEL);
 127                 if (!slot->hotplug_slot)
 128                         goto error_slot;
 129                 hotplug_slot = slot->hotplug_slot;
 130
 131                 hotplug_slot->info =
 132                         kzalloc(sizeof(*(hotplug_slot->info)),
 133                                                 GFP_KERNEL);
 134                 if (!hotplug_slot->info)
 135                         goto error_hpslot;
 136                 hotplug_slot_info = hotplug_slot->info;
 137                 hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
 138                 if (!hotplug_slot->name)
 139                         goto error_info;
 140
 141                 slot->ctrl = ctrl;
 142                 slot->bus = ctrl->slot_bus;
 143                 slot->device = slot_device;
 144                 slot->hpc_ops = hpc_ops = ctrl->hpc_ops;
 145
 146                 slot->number = ctrl->first_slot;
 147                 slot->hp_slot = slot_device - ctrl->slot_device_offset;
 148
 149                 /* register this slot with the hotplug pci core */
 150                 hotplug_slot->private = slot;
 151                 hotplug_slot->release = &release_slot;
 152                 make_slot_name(hotplug_slot->name, SLOT_NAME_SIZE, slot);
 153                 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 154
 155                 hpc_ops->get_power_status(slot,
 156                         &(hotplug_slot_info->power_status));
 157                 hpc_ops->get_attention_status(slot,
 158                         &(hotplug_slot_info->attention_status));
 159                 hpc_ops->get_latch_status(slot,
 160                         &(hotplug_slot_info->latch_status));
 161                 hpc_ops->get_adapter_status(slot,
 162                         &(hotplug_slot_info->adapter_status));
 163
 164                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 165                         "slot_device_offset=%x\n",
 166                         slot->bus, slot->device, slot->hp_slot, slot->number,
 167                         ctrl->slot_device_offset);
 168                 result = pci_hp_register(hotplug_slot);
 169                 if (result) {
 170                         err ("pci_hp_register failed with error %d\n", result);
 171                         goto error_name;
 172                 }
 173
 174                 slot->next = ctrl->slot;
 175                 ctrl->slot = slot;
 176
 177                 number_of_slots--;
 178                 slot_device++;
 179                 slot_number += ctrl->slot_num_inc;
 180         }
 181
 182         return 0;
 183
 184 error_name:
 185         kfree(hotplug_slot->name);
 186 error_info:
 187         kfree(hotplug_slot_info);
 188 error_hpslot:
 189         kfree(hotplug_slot);
 190 error_slot:
 191         kfree(slot);
 192 error:
 193         return result;
 194 }
 195
 196
 197 static int cleanup_slots (struct controller * ctrl)
 198 {
 199         struct slot *old_slot, *next_slot;
 200
 201         old_slot = ctrl->slot;
 202         ctrl->slot = NULL;
 203
 204         while (old_slot) {
 205                 next_slot = old_slot->next;
 206                 pci_hp_deregister (old_slot->hotplug_slot);
 207                 old_slot = next_slot;
 208         }
 209
 210
 211         return(0);
 212 }
 213
 214 static int get_ctlr_slot_config(struct controller *ctrl)
 215 {
 216         int num_ctlr_slots;             /* Not needed; PCI Express has 1 slot per port*/
 217         int first_device_num;           /* Not needed */
 218         int physical_slot_num;
 219         u8 ctrlcap;
 220         int rc;
 221
 222         rc = pcie_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &ctrlcap);
 223         if (rc) {
 224                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
 225                 return (-1);
 226         }
 227
 228         ctrl->num_slots = num_ctlr_slots;       /* PCI Express has 1 slot per port */
 229         ctrl->slot_device_offset = first_device_num;
 230         ctrl->first_slot = physical_slot_num;
 231         ctrl->ctrlcap = ctrlcap;
 232
 233         dbg("%s: bus(0x%x) num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) ctrlcap(%x) for b:d (%x:%x)\n",
 234                 __FUNCTION__, ctrl->slot_bus, num_ctlr_slots, first_device_num, physical_slot_num, ctrlcap,
 235                 ctrl->bus, ctrl->device);
 236
 237         return (0);
 238 }
 239
 240
 241 /*
 242  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 243  */
 244 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 245 {
 246         struct slot *slot = hotplug_slot->private;
 247
 248         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 249
 250         hotplug_slot->info->attention_status = status;
 251
 252         if (ATTN_LED(slot->ctrl->ctrlcap))
 253                 slot->hpc_ops->set_attention_status(slot, status);
 254
 255         return 0;
 256 }
 257
 258
 259 static int enable_slot(struct hotplug_slot *hotplug_slot)
 260 {
 261         struct slot *slot = hotplug_slot->private;
 262
 263         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 264
 265         return pciehp_enable_slot(slot);
 266 }
 267
 268
 269 static int disable_slot(struct hotplug_slot *hotplug_slot)
 270 {
 271         struct slot *slot = hotplug_slot->private;
 272
 273         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 274
 275         return pciehp_disable_slot(slot);
 276 }
 277
 278 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 279 {
 280         struct slot *slot = hotplug_slot->private;
 281         int retval;
 282
 283         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 284
 285         retval = slot->hpc_ops->get_power_status(slot, value);
 286         if (retval < 0)
 287                 *value = hotplug_slot->info->power_status;
 288
 289         return 0;
 290 }
 291
 292 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 293 {
 294         struct slot *slot = hotplug_slot->private;
 295         int retval;
 296
 297         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 298
 299         retval = slot->hpc_ops->get_attention_status(slot, value);
 300         if (retval < 0)
 301                 *value = hotplug_slot->info->attention_status;
 302
 303         return 0;
 304 }
 305
 306 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 307 {
 308         struct slot *slot = hotplug_slot->private;
 309         int retval;
 310
 311         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 312
 313         retval = slot->hpc_ops->get_latch_status(slot, value);
 314         if (retval < 0)
 315                 *value = hotplug_slot->info->latch_status;
 316
 317         return 0;
 318 }
 319
 320 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 321 {
 322         struct slot *slot = hotplug_slot->private;
 323         int retval;
 324
 325         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 326
 327         retval = slot->hpc_ops->get_adapter_status(slot, value);
 328         if (retval < 0)
 329                 *value = hotplug_slot->info->adapter_status;
 330
 331         return 0;
 332 }
 333
 334 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *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_max_bus_speed(slot, value);
 342         if (retval < 0)
 343                 *value = PCI_SPEED_UNKNOWN;
 344
 345         return 0;
 346 }
 347
 348 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *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_cur_bus_speed(slot, value);
 356         if (retval < 0)
 357                 *value = PCI_SPEED_UNKNOWN;
 358
 359         return 0;
 360 }
 361
 362 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
 363 {
 364         int rc;
 365         struct controller *ctrl;
 366         struct slot *t_slot;
 367         int first_device_num = 0 ;      /* first PCI device number supported by this PCIE */
 368         int num_ctlr_slots;             /* number of slots supported by this HPC */
 369         u8 value;
 370         struct pci_dev *pdev;
 371
 372         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 373         if (!ctrl) {
 374                 err("%s : out of memory\n", __FUNCTION__);
 375                 goto err_out_none;
 376         }
 377
 378         pdev = dev->port;
 379         ctrl->pci_dev = pdev;
 380
 381         rc = pcie_init(ctrl, dev);
 382         if (rc) {
 383                 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
 384                 goto err_out_free_ctrl;
 385         }
 386
 387         pci_set_drvdata(pdev, ctrl);
 388
 389         ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);
 390         if (!ctrl->pci_bus) {
 391                 err("%s: out of memory\n", __FUNCTION__);
 392                 rc = -ENOMEM;
 393                 goto err_out_unmap_mmio_region;
 394         }
 395         memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
 396         ctrl->bus = pdev->bus->number;  /* ctrl bus */
 397         ctrl->slot_bus = pdev->subordinate->number;  /* bus controlled by this HPC */
 398
 399         ctrl->device = PCI_SLOT(pdev->devfn);
 400         ctrl->function = PCI_FUNC(pdev->devfn);
 401         dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
 402                 ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
 403
 404         /*
 405          *      Save configuration headers for this and subordinate PCI buses
 406          */
 407
 408         rc = get_ctlr_slot_config(ctrl);
 409         if (rc) {
 410                 err(msg_initialization_err, rc);
 411                 goto err_out_free_ctrl_bus;
 412         }
 413         first_device_num = ctrl->slot_device_offset;
 414         num_ctlr_slots = ctrl->num_slots;
 415
 416         /* Setup the slot information structures */
 417         rc = init_slots(ctrl);
 418         if (rc) {
 419                 err(msg_initialization_err, 6);
 420                 goto err_out_free_ctrl_slot;
 421         }
 422
 423         t_slot = pciehp_find_slot(ctrl, first_device_num);
 424
 425         /*      Finish setting up the hot plug ctrl device */
 426         ctrl->next_event = 0;
 427
 428         if (!pciehp_ctrl_list) {
 429                 pciehp_ctrl_list = ctrl;
 430                 ctrl->next = NULL;
 431         } else {
 432                 ctrl->next = pciehp_ctrl_list;
 433                 pciehp_ctrl_list = ctrl;
 434         }
 435
 436         /* Wait for exclusive access to hardware */
 437         mutex_lock(&ctrl->crit_sect);
 438
 439         t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
 440
 441         if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
 442                 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
 443                 if (rc) {
 444                         /* Done with exclusive hardware access */
 445                         mutex_unlock(&ctrl->crit_sect);
 446                         goto err_out_free_ctrl_slot;
 447                 } else
 448                         /* Wait for the command to complete */
 449                         wait_for_ctrl_irq (ctrl);
 450         }
 451
 452         /* Done with exclusive hardware access */
 453         mutex_unlock(&ctrl->crit_sect);
 454
 455         return 0;
 456
 457 err_out_free_ctrl_slot:
 458         cleanup_slots(ctrl);
 459 err_out_free_ctrl_bus:
 460         kfree(ctrl->pci_bus);
 461 err_out_unmap_mmio_region:
 462         ctrl->hpc_ops->release_ctlr(ctrl);
 463 err_out_free_ctrl:
 464         kfree(ctrl);
 465 err_out_none:
 466         return -ENODEV;
 467 }
 468
 469
 470 static int pcie_start_thread(void)
 471 {
 472         int retval = 0;
 473
 474         dbg("Initialize + Start the notification/polling mechanism \n");
 475
 476         retval = pciehp_event_start_thread();
 477         if (retval) {
 478                 dbg("pciehp_event_start_thread() failed\n");
 479                 return retval;
 480         }
 481
 482         return retval;
 483 }
 484
 485 static void __exit unload_pciehpd(void)
 486 {
 487         struct controller *ctrl;
 488         struct controller *tctrl;
 489
 490         ctrl = pciehp_ctrl_list;
 491
 492         while (ctrl) {
 493                 cleanup_slots(ctrl);
 494
 495                 kfree (ctrl->pci_bus);
 496
 497                 ctrl->hpc_ops->release_ctlr(ctrl);
 498
 499                 tctrl = ctrl;
 500                 ctrl = ctrl->next;
 501
 502                 kfree(tctrl);
 503         }
 504
 505         /* Stop the notification mechanism */
 506         pciehp_event_stop_thread();
 507
 508 }
 509
 510 static int hpdriver_context = 0;
 511
 512 static void pciehp_remove (struct pcie_device *device)
 513 {
 514         printk("%s ENTRY\n", __FUNCTION__);
 515         printk("%s -> Call free_irq for irq = %d\n",
 516                 __FUNCTION__, device->irq);
 517         free_irq(device->irq, &hpdriver_context);
 518 }
 519
 520 #ifdef CONFIG_PM
 521 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
 522 {
 523         printk("%s ENTRY\n", __FUNCTION__);
 524         return 0;
 525 }
 526
 527 static int pciehp_resume (struct pcie_device *dev)
 528 {
 529         printk("%s ENTRY\n", __FUNCTION__);
 530         return 0;
 531 }
 532 #endif
 533
 534 static struct pcie_port_service_id port_pci_ids[] = { {
 535         .vendor = PCI_ANY_ID,
 536         .device = PCI_ANY_ID,
 537         .port_type = PCIE_ANY_PORT,
 538         .service_type = PCIE_PORT_SERVICE_HP,
 539         .driver_data =  0,
 540         }, { /* end: all zeroes */ }
 541 };
 542 static const char device_name[] = "hpdriver";
 543
 544 static struct pcie_port_service_driver hpdriver_portdrv = {
 545         .name           = (char *)device_name,
 546         .id_table       = &port_pci_ids[0],
 547
 548         .probe          = pciehp_probe,
 549         .remove         = pciehp_remove,
 550
 551 #ifdef  CONFIG_PM
 552         .suspend        = pciehp_suspend,
 553         .resume         = pciehp_resume,
 554 #endif  /* PM */
 555 };
 556
 557 static int __init pcied_init(void)
 558 {
 559         int retval = 0;
 560
 561 #ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
 562         pciehp_poll_mode = 1;
 563 #endif
 564
 565         retval = pcie_start_thread();
 566         if (retval)
 567                 goto error_hpc_init;
 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", __FUNCTION__);
 574
 575 error_hpc_init:
 576         if (retval) {
 577                 pciehp_event_stop_thread();
 578         };
 579
 580         return retval;
 581 }
 582
 583 static void __exit pcied_cleanup(void)
 584 {
 585         dbg("unload_pciehpd()\n");
 586         unload_pciehpd();
 587
 588         pcie_port_service_unregister(&hpdriver_portdrv);
 589
 590         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 591 }
 592
 593 module_init(pcied_init);
 594 module_exit(pcied_cleanup);