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_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  * release_slot - free up the memory used by a slot
  92  * @hotplug_slot: slot to free
  93  */
  94 static void release_slot(struct hotplug_slot *hotplug_slot)
  95 {
  96         struct slot *slot = hotplug_slot->private;
  97
  98         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
  99
 100         kfree(slot->hotplug_slot->info);
 101         kfree(slot->hotplug_slot->name);
 102         kfree(slot->hotplug_slot);
 103         kfree(slot);
 104 }
 105
 106 static int init_slots(struct controller *ctrl)
 107 {
 108         struct slot *slot;
 109         struct hpc_ops *hpc_ops;
 110         struct hotplug_slot *hotplug_slot;
 111         struct hotplug_slot_info *hotplug_slot_info;
 112         u8 number_of_slots;
 113         u8 slot_device;
 114         u32 slot_number;
 115         int result = -ENOMEM;
 116
 117         number_of_slots = ctrl->num_slots;
 118         slot_device = ctrl->slot_device_offset;
 119         slot_number = ctrl->first_slot;
 120
 121         while (number_of_slots) {
 122                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 123                 if (!slot)
 124                         goto error;
 125
 126                 slot->hotplug_slot =
 127                                 kzalloc(sizeof(*(slot->hotplug_slot)),
 128                                                 GFP_KERNEL);
 129                 if (!slot->hotplug_slot)
 130                         goto error_slot;
 131                 hotplug_slot = slot->hotplug_slot;
 132
 133                 hotplug_slot->info =
 134                         kzalloc(sizeof(*(hotplug_slot->info)),
 135                                                 GFP_KERNEL);
 136                 if (!hotplug_slot->info)
 137                         goto error_hpslot;
 138                 hotplug_slot_info = hotplug_slot->info;
 139                 hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
 140                 if (!hotplug_slot->name)
 141                         goto error_info;
 142
 143                 slot->ctrl = ctrl;
 144                 slot->bus = ctrl->slot_bus;
 145                 slot->device = slot_device;
 146                 slot->hpc_ops = hpc_ops = ctrl->hpc_ops;
 147
 148                 slot->number = ctrl->first_slot;
 149                 slot->hp_slot = slot_device - ctrl->slot_device_offset;
 150
 151                 /* register this slot with the hotplug pci core */
 152                 hotplug_slot->private = slot;
 153                 hotplug_slot->release = &release_slot;
 154                 make_slot_name(hotplug_slot->name, SLOT_NAME_SIZE, slot);
 155                 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
 156
 157                 hpc_ops->get_power_status(slot,
 158                         &(hotplug_slot_info->power_status));
 159                 hpc_ops->get_attention_status(slot,
 160                         &(hotplug_slot_info->attention_status));
 161                 hpc_ops->get_latch_status(slot,
 162                         &(hotplug_slot_info->latch_status));
 163                 hpc_ops->get_adapter_status(slot,
 164                         &(hotplug_slot_info->adapter_status));
 165
 166                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 167                         "slot_device_offset=%x\n",
 168                         slot->bus, slot->device, slot->hp_slot, slot->number,
 169                         ctrl->slot_device_offset);
 170                 result = pci_hp_register(hotplug_slot);
 171                 if (result) {
 172                         err ("pci_hp_register failed with error %d\n", result);
 173                         goto error_name;
 174                 }
 175
 176                 slot->next = ctrl->slot;
 177                 ctrl->slot = slot;
 178
 179                 number_of_slots--;
 180                 slot_device++;
 181                 slot_number += ctrl->slot_num_inc;
 182         }
 183
 184         return 0;
 185
 186 error_name:
 187         kfree(hotplug_slot->name);
 188 error_info:
 189         kfree(hotplug_slot_info);
 190 error_hpslot:
 191         kfree(hotplug_slot);
 192 error_slot:
 193         kfree(slot);
 194 error:
 195         return result;
 196 }
 197
 198
 199 static int cleanup_slots (struct controller * ctrl)
 200 {
 201         struct slot *old_slot, *next_slot;
 202
 203         old_slot = ctrl->slot;
 204         ctrl->slot = NULL;
 205
 206         while (old_slot) {
 207                 next_slot = old_slot->next;
 208                 pci_hp_deregister (old_slot->hotplug_slot);
 209                 old_slot = next_slot;
 210         }
 211
 212
 213         return(0);
 214 }
 215
 216 static int get_ctlr_slot_config(struct controller *ctrl)
 217 {
 218         int num_ctlr_slots;             /* Not needed; PCI Express has 1 slot per port*/
 219         int first_device_num;           /* Not needed */
 220         int physical_slot_num;
 221         u8 ctrlcap;
 222         int rc;
 223
 224         rc = pcie_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &ctrlcap);
 225         if (rc) {
 226                 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
 227                 return (-1);
 228         }
 229
 230         ctrl->num_slots = num_ctlr_slots;       /* PCI Express has 1 slot per port */
 231         ctrl->slot_device_offset = first_device_num;
 232         ctrl->first_slot = physical_slot_num;
 233         ctrl->ctrlcap = ctrlcap;
 234
 235         dbg("%s: bus(0x%x) num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) ctrlcap(%x) for b:d (%x:%x)\n",
 236                 __FUNCTION__, ctrl->slot_bus, num_ctlr_slots, first_device_num, physical_slot_num, ctrlcap,
 237                 ctrl->bus, ctrl->device);
 238
 239         return (0);
 240 }
 241
 242
 243 /*
 244  * set_attention_status - Turns the Amber LED for a slot on, off or blink
 245  */
 246 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 247 {
 248         struct slot *slot = hotplug_slot->private;
 249
 250         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 251
 252         hotplug_slot->info->attention_status = status;
 253
 254         if (ATTN_LED(slot->ctrl->ctrlcap))
 255                 slot->hpc_ops->set_attention_status(slot, status);
 256
 257         return 0;
 258 }
 259
 260
 261 static int enable_slot(struct hotplug_slot *hotplug_slot)
 262 {
 263         struct slot *slot = hotplug_slot->private;
 264
 265         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 266
 267         return pciehp_enable_slot(slot);
 268 }
 269
 270
 271 static int disable_slot(struct hotplug_slot *hotplug_slot)
 272 {
 273         struct slot *slot = hotplug_slot->private;
 274
 275         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 276
 277         return pciehp_disable_slot(slot);
 278 }
 279
 280 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 281 {
 282         struct slot *slot = hotplug_slot->private;
 283         int retval;
 284
 285         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 286
 287         retval = slot->hpc_ops->get_power_status(slot, value);
 288         if (retval < 0)
 289                 *value = hotplug_slot->info->power_status;
 290
 291         return 0;
 292 }
 293
 294 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 295 {
 296         struct slot *slot = hotplug_slot->private;
 297         int retval;
 298
 299         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 300
 301         retval = slot->hpc_ops->get_attention_status(slot, value);
 302         if (retval < 0)
 303                 *value = hotplug_slot->info->attention_status;
 304
 305         return 0;
 306 }
 307
 308 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 309 {
 310         struct slot *slot = hotplug_slot->private;
 311         int retval;
 312
 313         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 314
 315         retval = slot->hpc_ops->get_latch_status(slot, value);
 316         if (retval < 0)
 317                 *value = hotplug_slot->info->latch_status;
 318
 319         return 0;
 320 }
 321
 322 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 323 {
 324         struct slot *slot = hotplug_slot->private;
 325         int retval;
 326
 327         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 328
 329         retval = slot->hpc_ops->get_adapter_status(slot, value);
 330         if (retval < 0)
 331                 *value = hotplug_slot->info->adapter_status;
 332
 333         return 0;
 334 }
 335
 336 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
 337 {
 338         struct slot *slot = hotplug_slot->private;
 339         struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
 340
 341         dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 342
 343         *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
 344
 345         return 0;
 346 }
 347
 348 static int get_max_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_max_bus_speed(slot, value);
 356         if (retval < 0)
 357                 *value = PCI_SPEED_UNKNOWN;
 358
 359         return 0;
 360 }
 361
 362 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *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_cur_bus_speed(slot, value);
 370         if (retval < 0)
 371                 *value = PCI_SPEED_UNKNOWN;
 372
 373         return 0;
 374 }
 375
 376 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
 377 {
 378         int rc;
 379         struct controller *ctrl;
 380         struct slot *t_slot;
 381         int first_device_num = 0 ;      /* first PCI device number supported by this PCIE */
 382         int num_ctlr_slots;             /* number of slots supported by this HPC */
 383         u8 value;
 384         struct pci_dev *pdev;
 385
 386         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 387         if (!ctrl) {
 388                 err("%s : out of memory\n", __FUNCTION__);
 389                 goto err_out_none;
 390         }
 391
 392         pdev = dev->port;
 393         ctrl->pci_dev = pdev;
 394
 395         rc = pcie_init(ctrl, dev);
 396         if (rc) {
 397                 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
 398                 goto err_out_free_ctrl;
 399         }
 400
 401         pci_set_drvdata(pdev, ctrl);
 402
 403         ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);
 404         if (!ctrl->pci_bus) {
 405                 err("%s: out of memory\n", __FUNCTION__);
 406                 rc = -ENOMEM;
 407                 goto err_out_unmap_mmio_region;
 408         }
 409         memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
 410         ctrl->bus = pdev->bus->number;  /* ctrl bus */
 411         ctrl->slot_bus = pdev->subordinate->number;  /* bus controlled by this HPC */
 412
 413         ctrl->device = PCI_SLOT(pdev->devfn);
 414         ctrl->function = PCI_FUNC(pdev->devfn);
 415         dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
 416                 ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
 417
 418         /*
 419          *      Save configuration headers for this and subordinate PCI buses
 420          */
 421
 422         rc = get_ctlr_slot_config(ctrl);
 423         if (rc) {
 424                 err(msg_initialization_err, rc);
 425                 goto err_out_free_ctrl_bus;
 426         }
 427         first_device_num = ctrl->slot_device_offset;
 428         num_ctlr_slots = ctrl->num_slots;
 429
 430         /* Setup the slot information structures */
 431         rc = init_slots(ctrl);
 432         if (rc) {
 433                 err(msg_initialization_err, 6);
 434                 goto err_out_free_ctrl_slot;
 435         }
 436
 437         t_slot = pciehp_find_slot(ctrl, first_device_num);
 438
 439         /*      Finish setting up the hot plug ctrl device */
 440         ctrl->next_event = 0;
 441
 442         if (!pciehp_ctrl_list) {
 443                 pciehp_ctrl_list = ctrl;
 444                 ctrl->next = NULL;
 445         } else {
 446                 ctrl->next = pciehp_ctrl_list;
 447                 pciehp_ctrl_list = ctrl;
 448         }
 449
 450         /* Wait for exclusive access to hardware */
 451         mutex_lock(&ctrl->crit_sect);
 452
 453         t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
 454
 455         if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
 456                 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
 457                 if (rc) {
 458                         /* Done with exclusive hardware access */
 459                         mutex_unlock(&ctrl->crit_sect);
 460                         goto err_out_free_ctrl_slot;
 461                 } else
 462                         /* Wait for the command to complete */
 463                         wait_for_ctrl_irq (ctrl);
 464         }
 465
 466         /* Done with exclusive hardware access */
 467         mutex_unlock(&ctrl->crit_sect);
 468
 469         return 0;
 470
 471 err_out_free_ctrl_slot:
 472         cleanup_slots(ctrl);
 473 err_out_free_ctrl_bus:
 474         kfree(ctrl->pci_bus);
 475 err_out_unmap_mmio_region:
 476         ctrl->hpc_ops->release_ctlr(ctrl);
 477 err_out_free_ctrl:
 478         kfree(ctrl);
 479 err_out_none:
 480         return -ENODEV;
 481 }
 482
 483
 484 static int pcie_start_thread(void)
 485 {
 486         int retval = 0;
 487
 488         dbg("Initialize + Start the notification/polling mechanism \n");
 489
 490         retval = pciehp_event_start_thread();
 491         if (retval) {
 492                 dbg("pciehp_event_start_thread() failed\n");
 493                 return retval;
 494         }
 495
 496         return retval;
 497 }
 498
 499 static void __exit unload_pciehpd(void)
 500 {
 501         struct controller *ctrl;
 502         struct controller *tctrl;
 503
 504         ctrl = pciehp_ctrl_list;
 505
 506         while (ctrl) {
 507                 cleanup_slots(ctrl);
 508
 509                 kfree (ctrl->pci_bus);
 510
 511                 ctrl->hpc_ops->release_ctlr(ctrl);
 512
 513                 tctrl = ctrl;
 514                 ctrl = ctrl->next;
 515
 516                 kfree(tctrl);
 517         }
 518
 519         /* Stop the notification mechanism */
 520         pciehp_event_stop_thread();
 521
 522 }
 523
 524 static int hpdriver_context = 0;
 525
 526 static void pciehp_remove (struct pcie_device *device)
 527 {
 528         printk("%s ENTRY\n", __FUNCTION__);
 529         printk("%s -> Call free_irq for irq = %d\n",
 530                 __FUNCTION__, device->irq);
 531         free_irq(device->irq, &hpdriver_context);
 532 }
 533
 534 #ifdef CONFIG_PM
 535 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
 536 {
 537         printk("%s ENTRY\n", __FUNCTION__);
 538         return 0;
 539 }
 540
 541 static int pciehp_resume (struct pcie_device *dev)
 542 {
 543         printk("%s ENTRY\n", __FUNCTION__);
 544         return 0;
 545 }
 546 #endif
 547
 548 static struct pcie_port_service_id port_pci_ids[] = { {
 549         .vendor = PCI_ANY_ID,
 550         .device = PCI_ANY_ID,
 551         .port_type = PCIE_ANY_PORT,
 552         .service_type = PCIE_PORT_SERVICE_HP,
 553         .driver_data =  0,
 554         }, { /* end: all zeroes */ }
 555 };
 556 static const char device_name[] = "hpdriver";
 557
 558 static struct pcie_port_service_driver hpdriver_portdrv = {
 559         .name           = (char *)device_name,
 560         .id_table       = &port_pci_ids[0],
 561
 562         .probe          = pciehp_probe,
 563         .remove         = pciehp_remove,
 564
 565 #ifdef  CONFIG_PM
 566         .suspend        = pciehp_suspend,
 567         .resume         = pciehp_resume,
 568 #endif  /* PM */
 569 };
 570
 571 static int __init pcied_init(void)
 572 {
 573         int retval = 0;
 574
 575 #ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
 576         pciehp_poll_mode = 1;
 577 #endif
 578
 579         retval = pcie_start_thread();
 580         if (retval)
 581                 goto error_hpc_init;
 582
 583         retval = pcie_port_service_register(&hpdriver_portdrv);
 584         dbg("pcie_port_service_register = %d\n", retval);
 585         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 586         if (retval)
 587                 dbg("%s: Failure to register service\n", __FUNCTION__);
 588
 589 error_hpc_init:
 590         if (retval) {
 591                 pciehp_event_stop_thread();
 592         };
 593
 594         return retval;
 595 }
 596
 597 static void __exit pcied_cleanup(void)
 598 {
 599         dbg("unload_pciehpd()\n");
 600         unload_pciehpd();
 601
 602         pcie_port_service_unregister(&hpdriver_portdrv);
 603
 604         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 605 }
 606
 607 module_init(pcied_init);
 608 module_exit(pcied_cleanup);