drivers/staging/dgnc/dgnc_driver.c

   1 /*
   2  * Copyright 2003 Digi International (www.digi.com)
   3  *      Scott H Kilau <Scott_Kilau at digi dot com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
  12  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  13  * PURPOSE.  See the GNU General Public License for more details.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/pci.h>
  19 #include <linux/slab.h>
  20 #include <linux/sched.h>
  21 #include "dgnc_driver.h"
  22 #include "dgnc_pci.h"
  23 #include "dgnc_mgmt.h"
  24 #include "dgnc_tty.h"
  25 #include "dgnc_cls.h"
  26 #include "dgnc_neo.h"
  27 #include "dgnc_sysfs.h"
  28
  29 MODULE_LICENSE("GPL");
  30 MODULE_AUTHOR("Digi International, http://www.digi.com");
  31 MODULE_DESCRIPTION("Driver for the Digi International Neo and Classic PCI based product line");
  32 MODULE_SUPPORTED_DEVICE("dgnc");
  33
  34 /**************************************************************************
  35  *
  36  * protos for this file
  37  *
  38  */
  39 static int              dgnc_start(void);
  40 static int              dgnc_finalize_board_init(struct dgnc_board *brd);
  41 static int              dgnc_found_board(struct pci_dev *pdev, int id);
  42 static void             dgnc_cleanup_board(struct dgnc_board *brd);
  43 static void             dgnc_poll_handler(ulong dummy);
  44 static int              dgnc_init_one(struct pci_dev *pdev,
  45                                       const struct pci_device_id *ent);
  46 static void             dgnc_do_remap(struct dgnc_board *brd);
  47
  48 /*
  49  * File operations permitted on Control/Management major.
  50  */
  51 static const struct file_operations dgnc_board_fops = {
  52         .owner          =       THIS_MODULE,
  53         .unlocked_ioctl =       dgnc_mgmt_ioctl,
  54         .open           =       dgnc_mgmt_open,
  55         .release        =       dgnc_mgmt_close
  56 };
  57
  58 /*
  59  * Globals
  60  */
  61 uint                    dgnc_num_boards;
  62 struct dgnc_board               *dgnc_board[MAXBOARDS];
  63 DEFINE_SPINLOCK(dgnc_global_lock);
  64 DEFINE_SPINLOCK(dgnc_poll_lock); /* Poll scheduling lock */
  65 uint                    dgnc_major;
  66 int                     dgnc_poll_tick = 20;    /* Poll interval - 20 ms */
  67
  68 /*
  69  * Static vars.
  70  */
  71 static struct class *dgnc_class;
  72
  73 /*
  74  * Poller stuff
  75  */
  76 static ulong            dgnc_poll_time; /* Time of next poll */
  77 static uint             dgnc_poll_stop; /* Used to tell poller to stop */
  78 static struct timer_list dgnc_poll_timer;
  79
  80 static const struct pci_device_id dgnc_pci_tbl[] = {
  81         {PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_4_DID),     .driver_data = 0},
  82         {PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_4_422_DID), .driver_data = 1},
  83         {PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_8_DID),     .driver_data = 2},
  84         {PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_8_422_DID), .driver_data = 3},
  85         {0,}
  86 };
  87 MODULE_DEVICE_TABLE(pci, dgnc_pci_tbl);
  88
  89 struct board_id {
  90         unsigned char *name;
  91         uint maxports;
  92         unsigned int is_pci_express;
  93 };
  94
  95 static struct board_id dgnc_ids[] = {
  96         {       PCI_DEVICE_CLASSIC_4_PCI_NAME,          4,      0       },
  97         {       PCI_DEVICE_CLASSIC_4_422_PCI_NAME,      4,      0       },
  98         {       PCI_DEVICE_CLASSIC_8_PCI_NAME,          8,      0       },
  99         {       PCI_DEVICE_CLASSIC_8_422_PCI_NAME,      8,      0       },
 100         {       PCI_DEVICE_NEO_4_PCI_NAME,              4,      0       },
 101         {       PCI_DEVICE_NEO_8_PCI_NAME,              8,      0       },
 102         {       PCI_DEVICE_NEO_2DB9_PCI_NAME,           2,      0       },
 103         {       PCI_DEVICE_NEO_2DB9PRI_PCI_NAME,        2,      0       },
 104         {       PCI_DEVICE_NEO_2RJ45_PCI_NAME,          2,      0       },
 105         {       PCI_DEVICE_NEO_2RJ45PRI_PCI_NAME,       2,      0       },
 106         {       PCI_DEVICE_NEO_1_422_PCI_NAME,          1,      0       },
 107         {       PCI_DEVICE_NEO_1_422_485_PCI_NAME,      1,      0       },
 108         {       PCI_DEVICE_NEO_2_422_485_PCI_NAME,      2,      0       },
 109         {       PCI_DEVICE_NEO_EXPRESS_8_PCI_NAME,      8,      1       },
 110         {       PCI_DEVICE_NEO_EXPRESS_4_PCI_NAME,      4,      1       },
 111         {       PCI_DEVICE_NEO_EXPRESS_4RJ45_PCI_NAME,  4,      1       },
 112         {       PCI_DEVICE_NEO_EXPRESS_8RJ45_PCI_NAME,  8,      1       },
 113         {       NULL,                                   0,      0       }
 114 };
 115
 116 static struct pci_driver dgnc_driver = {
 117         .name           = "dgnc",
 118         .probe          = dgnc_init_one,
 119         .id_table       = dgnc_pci_tbl,
 120 };
 121
 122 /************************************************************************
 123  *
 124  * Driver load/unload functions
 125  *
 126  ************************************************************************/
 127
 128 static void cleanup(bool sysfiles)
 129 {
 130         int i;
 131         unsigned long flags;
 132
 133         spin_lock_irqsave(&dgnc_poll_lock, flags);
 134         dgnc_poll_stop = 1;
 135         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
 136
 137         /* Turn off poller right away. */
 138         del_timer_sync(&dgnc_poll_timer);
 139
 140         if (sysfiles)
 141                 dgnc_remove_driver_sysfiles(&dgnc_driver);
 142
 143         device_destroy(dgnc_class, MKDEV(dgnc_major, 0));
 144         class_destroy(dgnc_class);
 145         unregister_chrdev(dgnc_major, "dgnc");
 146
 147         for (i = 0; i < dgnc_num_boards; ++i) {
 148                 dgnc_remove_ports_sysfiles(dgnc_board[i]);
 149                 dgnc_tty_uninit(dgnc_board[i]);
 150                 dgnc_cleanup_board(dgnc_board[i]);
 151         }
 152
 153         dgnc_tty_post_uninit();
 154 }
 155
 156 /*
 157  * dgnc_cleanup_module()
 158  *
 159  * Module unload.  This is where it all ends.
 160  */
 161 static void dgnc_cleanup_module(void)
 162 {
 163         cleanup(true);
 164         pci_unregister_driver(&dgnc_driver);
 165 }
 166
 167 /*
 168  * init_module()
 169  *
 170  * Module load.  This is where it all starts.
 171  */
 172 static int __init dgnc_init_module(void)
 173 {
 174         int rc;
 175
 176         /*
 177          * Initialize global stuff
 178          */
 179         rc = dgnc_start();
 180
 181         if (rc < 0)
 182                 return rc;
 183
 184         /*
 185          * Find and configure all the cards
 186          */
 187         rc = pci_register_driver(&dgnc_driver);
 188         if (rc) {
 189                 pr_warn("WARNING: dgnc driver load failed.  No Digi Neo or Classic boards found.\n");
 190                 cleanup(false);
 191                 return rc;
 192         }
 193         dgnc_create_driver_sysfiles(&dgnc_driver);
 194
 195         return 0;
 196 }
 197
 198 module_init(dgnc_init_module);
 199 module_exit(dgnc_cleanup_module);
 200
 201 /*
 202  * Start of driver.
 203  */
 204 static int dgnc_start(void)
 205 {
 206         int rc = 0;
 207         unsigned long flags;
 208         struct device *dev;
 209
 210         /* make sure timer is initialized before we do anything else */
 211         init_timer(&dgnc_poll_timer);
 212
 213         /*
 214          * Register our base character device into the kernel.
 215          * This allows the download daemon to connect to the downld device
 216          * before any of the boards are init'ed.
 217          *
 218          * Register management/dpa devices
 219          */
 220         rc = register_chrdev(0, "dgnc", &dgnc_board_fops);
 221         if (rc < 0) {
 222                 pr_err(DRVSTR ": Can't register dgnc driver device (%d)\n", rc);
 223                 return rc;
 224         }
 225         dgnc_major = rc;
 226
 227         dgnc_class = class_create(THIS_MODULE, "dgnc_mgmt");
 228         if (IS_ERR(dgnc_class)) {
 229                 rc = PTR_ERR(dgnc_class);
 230                 pr_err(DRVSTR ": Can't create dgnc_mgmt class (%d)\n", rc);
 231                 goto failed_class;
 232         }
 233
 234         dev = device_create(dgnc_class, NULL,
 235                             MKDEV(dgnc_major, 0),
 236                         NULL, "dgnc_mgmt");
 237         if (IS_ERR(dev)) {
 238                 rc = PTR_ERR(dev);
 239                 pr_err(DRVSTR ": Can't create device (%d)\n", rc);
 240                 goto failed_device;
 241         }
 242
 243         /*
 244          * Init any global tty stuff.
 245          */
 246         rc = dgnc_tty_preinit();
 247
 248         if (rc < 0) {
 249                 pr_err(DRVSTR ": tty preinit - not enough memory (%d)\n", rc);
 250                 goto failed_tty;
 251         }
 252
 253         /* Start the poller */
 254         spin_lock_irqsave(&dgnc_poll_lock, flags);
 255         setup_timer(&dgnc_poll_timer, dgnc_poll_handler, 0);
 256         dgnc_poll_time = jiffies + dgnc_jiffies_from_ms(dgnc_poll_tick);
 257         dgnc_poll_timer.expires = dgnc_poll_time;
 258         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
 259
 260         add_timer(&dgnc_poll_timer);
 261
 262         return 0;
 263
 264 failed_tty:
 265         device_destroy(dgnc_class, MKDEV(dgnc_major, 0));
 266 failed_device:
 267         class_destroy(dgnc_class);
 268 failed_class:
 269         unregister_chrdev(dgnc_major, "dgnc");
 270         return rc;
 271 }
 272
 273 /* returns count (>= 0), or negative on error */
 274 static int dgnc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 275 {
 276         int rc;
 277
 278         /* wake up and enable device */
 279         rc = pci_enable_device(pdev);
 280
 281         if (rc)
 282                 return -EIO;
 283
 284         rc = dgnc_found_board(pdev, ent->driver_data);
 285         if (rc == 0)
 286                 dgnc_num_boards++;
 287
 288         return rc;
 289 }
 290
 291 /*
 292  * dgnc_cleanup_board()
 293  *
 294  * Free all the memory associated with a board
 295  */
 296 static void dgnc_cleanup_board(struct dgnc_board *brd)
 297 {
 298         int i = 0;
 299
 300         if (!brd || brd->magic != DGNC_BOARD_MAGIC)
 301                 return;
 302
 303         switch (brd->device) {
 304         case PCI_DEVICE_CLASSIC_4_DID:
 305         case PCI_DEVICE_CLASSIC_8_DID:
 306         case PCI_DEVICE_CLASSIC_4_422_DID:
 307         case PCI_DEVICE_CLASSIC_8_422_DID:
 308
 309                 /* Tell card not to interrupt anymore. */
 310                 outb(0, brd->iobase + 0x4c);
 311                 break;
 312
 313         default:
 314                 break;
 315         }
 316
 317         if (brd->irq)
 318                 free_irq(brd->irq, brd);
 319
 320         tasklet_kill(&brd->helper_tasklet);
 321
 322         if (brd->re_map_membase) {
 323                 iounmap(brd->re_map_membase);
 324                 brd->re_map_membase = NULL;
 325         }
 326
 327         if (brd->msgbuf_head) {
 328                 unsigned long flags;
 329
 330                 spin_lock_irqsave(&dgnc_global_lock, flags);
 331                 brd->msgbuf = NULL;
 332                 dev_dbg(&brd->pdev->dev, "%s\n", brd->msgbuf_head);
 333                 kfree(brd->msgbuf_head);
 334                 brd->msgbuf_head = NULL;
 335                 spin_unlock_irqrestore(&dgnc_global_lock, flags);
 336         }
 337
 338         /* Free all allocated channels structs */
 339         for (i = 0; i < MAXPORTS ; i++) {
 340                 if (brd->channels[i]) {
 341                         kfree(brd->channels[i]->ch_rqueue);
 342                         kfree(brd->channels[i]->ch_equeue);
 343                         kfree(brd->channels[i]->ch_wqueue);
 344                         kfree(brd->channels[i]);
 345                         brd->channels[i] = NULL;
 346                 }
 347         }
 348
 349         dgnc_board[brd->boardnum] = NULL;
 350
 351         kfree(brd);
 352 }
 353
 354 /*
 355  * dgnc_found_board()
 356  *
 357  * A board has been found, init it.
 358  */
 359 static int dgnc_found_board(struct pci_dev *pdev, int id)
 360 {
 361         struct dgnc_board *brd;
 362         unsigned int pci_irq;
 363         int i = 0;
 364         int rc = 0;
 365         unsigned long flags;
 366
 367         /* get the board structure and prep it */
 368         dgnc_board[dgnc_num_boards] = kzalloc(sizeof(*brd), GFP_KERNEL);
 369         brd = dgnc_board[dgnc_num_boards];
 370
 371         if (!brd)
 372                 return -ENOMEM;
 373
 374         /* make a temporary message buffer for the boot messages */
 375         brd->msgbuf_head = kcalloc(8192, sizeof(u8), GFP_KERNEL);
 376         brd->msgbuf = brd->msgbuf_head;
 377
 378         if (!brd->msgbuf) {
 379                 kfree(brd);
 380                 return -ENOMEM;
 381         }
 382
 383         /* store the info for the board we've found */
 384         brd->magic = DGNC_BOARD_MAGIC;
 385         brd->boardnum = dgnc_num_boards;
 386         brd->vendor = dgnc_pci_tbl[id].vendor;
 387         brd->device = dgnc_pci_tbl[id].device;
 388         brd->pdev = pdev;
 389         brd->pci_bus = pdev->bus->number;
 390         brd->pci_slot = PCI_SLOT(pdev->devfn);
 391         brd->name = dgnc_ids[id].name;
 392         brd->maxports = dgnc_ids[id].maxports;
 393         if (dgnc_ids[i].is_pci_express)
 394                 brd->bd_flags |= BD_IS_PCI_EXPRESS;
 395         brd->dpastatus = BD_NOFEP;
 396         init_waitqueue_head(&brd->state_wait);
 397
 398         spin_lock_init(&brd->bd_lock);
 399         spin_lock_init(&brd->bd_intr_lock);
 400
 401         brd->state              = BOARD_FOUND;
 402
 403         for (i = 0; i < MAXPORTS; i++)
 404                 brd->channels[i] = NULL;
 405
 406         /* store which card & revision we have */
 407         pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &brd->subvendor);
 408         pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &brd->subdevice);
 409         pci_read_config_byte(pdev, PCI_REVISION_ID, &brd->rev);
 410
 411         pci_irq = pdev->irq;
 412         brd->irq = pci_irq;
 413
 414         switch (brd->device) {
 415         case PCI_DEVICE_CLASSIC_4_DID:
 416         case PCI_DEVICE_CLASSIC_8_DID:
 417         case PCI_DEVICE_CLASSIC_4_422_DID:
 418         case PCI_DEVICE_CLASSIC_8_422_DID:
 419
 420                 brd->dpatype = T_CLASSIC | T_PCIBUS;
 421
 422                 /*
 423                  * For PCI ClassicBoards
 424                  * PCI Local Address (i.e. "resource" number) space
 425                  * 0    PLX Memory Mapped Config
 426                  * 1    PLX I/O Mapped Config
 427                  * 2    I/O Mapped UARTs and Status
 428                  * 3    Memory Mapped VPD
 429                  * 4    Memory Mapped UARTs and Status
 430                  */
 431
 432                 /* get the PCI Base Address Registers */
 433                 brd->membase = pci_resource_start(pdev, 4);
 434
 435                 if (!brd->membase) {
 436                         dev_err(&brd->pdev->dev,
 437                                 "Card has no PCI IO resources, failing.\n");
 438                         return -ENODEV;
 439                 }
 440
 441                 brd->membase_end = pci_resource_end(pdev, 4);
 442
 443                 if (brd->membase & 1)
 444                         brd->membase &= ~3;
 445                 else
 446                         brd->membase &= ~15;
 447
 448                 brd->iobase     = pci_resource_start(pdev, 1);
 449                 brd->iobase_end = pci_resource_end(pdev, 1);
 450                 brd->iobase     = ((unsigned int)(brd->iobase)) & 0xFFFE;
 451
 452                 /* Assign the board_ops struct */
 453                 brd->bd_ops = &dgnc_cls_ops;
 454
 455                 brd->bd_uart_offset = 0x8;
 456                 brd->bd_dividend = 921600;
 457
 458                 dgnc_do_remap(brd);
 459
 460                 /* Get and store the board VPD, if it exists */
 461                 brd->bd_ops->vpd(brd);
 462
 463                 /*
 464                  * Enable Local Interrupt 1               (0x1),
 465                  * Local Interrupt 1 Polarity Active high (0x2),
 466                  * Enable PCI interrupt                   (0x40)
 467                  */
 468                 outb(0x43, brd->iobase + 0x4c);
 469
 470                 break;
 471
 472         case PCI_DEVICE_NEO_4_DID:
 473         case PCI_DEVICE_NEO_8_DID:
 474         case PCI_DEVICE_NEO_2DB9_DID:
 475         case PCI_DEVICE_NEO_2DB9PRI_DID:
 476         case PCI_DEVICE_NEO_2RJ45_DID:
 477         case PCI_DEVICE_NEO_2RJ45PRI_DID:
 478         case PCI_DEVICE_NEO_1_422_DID:
 479         case PCI_DEVICE_NEO_1_422_485_DID:
 480         case PCI_DEVICE_NEO_2_422_485_DID:
 481         case PCI_DEVICE_NEO_EXPRESS_8_DID:
 482         case PCI_DEVICE_NEO_EXPRESS_4_DID:
 483         case PCI_DEVICE_NEO_EXPRESS_4RJ45_DID:
 484         case PCI_DEVICE_NEO_EXPRESS_8RJ45_DID:
 485
 486                 /*
 487                  * This chip is set up 100% when we get to it.
 488                  * No need to enable global interrupts or anything.
 489                  */
 490                 if (brd->bd_flags & BD_IS_PCI_EXPRESS)
 491                         brd->dpatype = T_NEO_EXPRESS | T_PCIBUS;
 492                 else
 493                         brd->dpatype = T_NEO | T_PCIBUS;
 494
 495                 /* get the PCI Base Address Registers */
 496                 brd->membase     = pci_resource_start(pdev, 0);
 497                 brd->membase_end = pci_resource_end(pdev, 0);
 498
 499                 if (brd->membase & 1)
 500                         brd->membase &= ~3;
 501                 else
 502                         brd->membase &= ~15;
 503
 504                 /* Assign the board_ops struct */
 505                 brd->bd_ops = &dgnc_neo_ops;
 506
 507                 brd->bd_uart_offset = 0x200;
 508                 brd->bd_dividend = 921600;
 509
 510                 dgnc_do_remap(brd);
 511
 512                 if (brd->re_map_membase) {
 513                         /* Read and store the dvid after remapping */
 514                         brd->dvid = readb(brd->re_map_membase + 0x8D);
 515
 516                         /* Get and store the board VPD, if it exists */
 517                         brd->bd_ops->vpd(brd);
 518                 }
 519                 break;
 520
 521         default:
 522                 dev_err(&brd->pdev->dev,
 523                         "Didn't find any compatible Neo/Classic PCI boards.\n");
 524                 return -ENXIO;
 525         }
 526
 527         /*
 528          * Do tty device initialization.
 529          */
 530
 531         rc = dgnc_tty_register(brd);
 532         if (rc < 0) {
 533                 pr_err(DRVSTR ": Can't register tty devices (%d)\n", rc);
 534                 goto failed;
 535         }
 536
 537         rc = dgnc_finalize_board_init(brd);
 538         if (rc < 0) {
 539                 pr_err(DRVSTR ": Can't finalize board init (%d)\n", rc);
 540                 goto failed;
 541         }
 542
 543         rc = dgnc_tty_init(brd);
 544         if (rc < 0) {
 545                 pr_err(DRVSTR ": Can't init tty devices (%d)\n", rc);
 546                 goto failed;
 547         }
 548
 549         brd->state = BOARD_READY;
 550         brd->dpastatus = BD_RUNNING;
 551
 552         dgnc_create_ports_sysfiles(brd);
 553
 554         /* init our poll helper tasklet */
 555         tasklet_init(&brd->helper_tasklet,
 556                      brd->bd_ops->tasklet,
 557                      (unsigned long)brd);
 558
 559         spin_lock_irqsave(&dgnc_global_lock, flags);
 560         brd->msgbuf = NULL;
 561         dev_dbg(&brd->pdev->dev, "%s\n", brd->msgbuf_head);
 562         kfree(brd->msgbuf_head);
 563         brd->msgbuf_head = NULL;
 564         spin_unlock_irqrestore(&dgnc_global_lock, flags);
 565
 566         wake_up_interruptible(&brd->state_wait);
 567
 568         return 0;
 569
 570 failed:
 571         dgnc_tty_uninit(brd);
 572         brd->state = BOARD_FAILED;
 573         brd->dpastatus = BD_NOFEP;
 574
 575         return -ENXIO;
 576 }
 577
 578 static int dgnc_finalize_board_init(struct dgnc_board *brd)
 579 {
 580         int rc = 0;
 581
 582         if (!brd || brd->magic != DGNC_BOARD_MAGIC)
 583                 return -ENODEV;
 584
 585         if (brd->irq) {
 586                 rc = request_irq(brd->irq, brd->bd_ops->intr,
 587                                  IRQF_SHARED, "DGNC", brd);
 588
 589                 if (rc) {
 590                         dev_err(&brd->pdev->dev,
 591                                 "Failed to hook IRQ %d\n", brd->irq);
 592                         brd->state = BOARD_FAILED;
 593                         brd->dpastatus = BD_NOFEP;
 594                         rc = -ENODEV;
 595                 }
 596         }
 597         return rc;
 598 }
 599
 600 /*
 601  * Remap PCI memory.
 602  */
 603 static void dgnc_do_remap(struct dgnc_board *brd)
 604 {
 605         if (!brd || brd->magic != DGNC_BOARD_MAGIC)
 606                 return;
 607
 608         brd->re_map_membase = ioremap(brd->membase, 0x1000);
 609 }
 610
 611 /*****************************************************************************
 612 *
 613 * Function:
 614 *
 615 *    dgnc_poll_handler
 616 *
 617 * Author:
 618 *
 619 *    Scott H Kilau
 620 *
 621 * Parameters:
 622 *
 623 *    dummy -- ignored
 624 *
 625 * Return Values:
 626 *
 627 *    none
 628 *
 629 * Description:
 630 *
 631 *    As each timer expires, it determines (a) whether the "transmit"
 632 *    waiter needs to be woken up, and (b) whether the poller needs to
 633 *    be rescheduled.
 634 *
 635 ******************************************************************************/
 636
 637 static void dgnc_poll_handler(ulong dummy)
 638 {
 639         struct dgnc_board *brd;
 640         unsigned long flags;
 641         int i;
 642         unsigned long new_time;
 643
 644         /* Go thru each board, kicking off a tasklet for each if needed */
 645         for (i = 0; i < dgnc_num_boards; i++) {
 646                 brd = dgnc_board[i];
 647
 648                 spin_lock_irqsave(&brd->bd_lock, flags);
 649
 650                 /* If board is in a failed state don't schedule a tasklet */
 651                 if (brd->state == BOARD_FAILED) {
 652                         spin_unlock_irqrestore(&brd->bd_lock, flags);
 653                         continue;
 654                 }
 655
 656                 /* Schedule a poll helper task */
 657                 tasklet_schedule(&brd->helper_tasklet);
 658
 659                 spin_unlock_irqrestore(&brd->bd_lock, flags);
 660         }
 661
 662         /*
 663          * Schedule ourself back at the nominal wakeup interval.
 664          */
 665         spin_lock_irqsave(&dgnc_poll_lock, flags);
 666         dgnc_poll_time += dgnc_jiffies_from_ms(dgnc_poll_tick);
 667
 668         new_time = dgnc_poll_time - jiffies;
 669
 670         if ((ulong)new_time >= 2 * dgnc_poll_tick)
 671                 dgnc_poll_time = jiffies + dgnc_jiffies_from_ms(dgnc_poll_tick);
 672
 673         setup_timer(&dgnc_poll_timer, dgnc_poll_handler, 0);
 674         dgnc_poll_timer.expires = dgnc_poll_time;
 675         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
 676
 677         if (!dgnc_poll_stop)
 678                 add_timer(&dgnc_poll_timer);
 679 }