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_BoardFops = {
  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_NumBoards;
  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 /*
 129  * dgnc_cleanup_module()
 130  *
 131  * Module unload.  This is where it all ends.
 132  */
 133 static void dgnc_cleanup_module(void)
 134 {
 135         int i;
 136         unsigned long flags;
 137
 138         spin_lock_irqsave(&dgnc_poll_lock, flags);
 139         dgnc_poll_stop = 1;
 140         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
 141
 142         /* Turn off poller right away. */
 143         del_timer_sync(&dgnc_poll_timer);
 144
 145         dgnc_remove_driver_sysfiles(&dgnc_driver);
 146
 147         device_destroy(dgnc_class, MKDEV(dgnc_Major, 0));
 148         class_destroy(dgnc_class);
 149         unregister_chrdev(dgnc_Major, "dgnc");
 150
 151         for (i = 0; i < dgnc_NumBoards; ++i) {
 152                 dgnc_remove_ports_sysfiles(dgnc_Board[i]);
 153                 dgnc_tty_uninit(dgnc_Board[i]);
 154                 dgnc_cleanup_board(dgnc_Board[i]);
 155         }
 156
 157         dgnc_tty_post_uninit();
 158
 159         if (dgnc_NumBoards)
 160                 pci_unregister_driver(&dgnc_driver);
 161 }
 162
 163 /*
 164  * init_module()
 165  *
 166  * Module load.  This is where it all starts.
 167  */
 168 static int __init dgnc_init_module(void)
 169 {
 170         int rc;
 171
 172         /*
 173          * Initialize global stuff
 174          */
 175         rc = dgnc_start();
 176
 177         if (rc < 0)
 178                 return rc;
 179
 180         /*
 181          * Find and configure all the cards
 182          */
 183         rc = pci_register_driver(&dgnc_driver);
 184         if (rc) {
 185                 pr_warn("WARNING: dgnc driver load failed.  No Digi Neo or Classic boards found.\n");
 186                 dgnc_cleanup_module();
 187                 return rc;
 188         }
 189         dgnc_create_driver_sysfiles(&dgnc_driver);
 190
 191         return 0;
 192 }
 193
 194 module_init(dgnc_init_module);
 195 module_exit(dgnc_cleanup_module);
 196
 197 /*
 198  * Start of driver.
 199  */
 200 static int dgnc_start(void)
 201 {
 202         int rc = 0;
 203         unsigned long flags;
 204         struct device *dev;
 205
 206         /* make sure timer is initialized before we do anything else */
 207         init_timer(&dgnc_poll_timer);
 208
 209         /*
 210          * Register our base character device into the kernel.
 211          * This allows the download daemon to connect to the downld device
 212          * before any of the boards are init'ed.
 213          *
 214          * Register management/dpa devices
 215          */
 216         rc = register_chrdev(0, "dgnc", &dgnc_BoardFops);
 217         if (rc < 0) {
 218                 pr_err(DRVSTR ": Can't register dgnc driver device (%d)\n", rc);
 219                 return rc;
 220         }
 221         dgnc_Major = rc;
 222
 223         dgnc_class = class_create(THIS_MODULE, "dgnc_mgmt");
 224         if (IS_ERR(dgnc_class)) {
 225                 rc = PTR_ERR(dgnc_class);
 226                 pr_err(DRVSTR ": Can't create dgnc_mgmt class (%d)\n", rc);
 227                 goto failed_class;
 228         }
 229
 230         dev = device_create(dgnc_class, NULL,
 231                             MKDEV(dgnc_Major, 0),
 232                         NULL, "dgnc_mgmt");
 233         if (IS_ERR(dev)) {
 234                 rc = PTR_ERR(dev);
 235                 pr_err(DRVSTR ": Can't create device (%d)\n", rc);
 236                 goto failed_device;
 237         }
 238
 239         /*
 240          * Init any global tty stuff.
 241          */
 242         rc = dgnc_tty_preinit();
 243
 244         if (rc < 0) {
 245                 pr_err(DRVSTR ": tty preinit - not enough memory (%d)\n", rc);
 246                 goto failed_tty;
 247         }
 248
 249         /* Start the poller */
 250         spin_lock_irqsave(&dgnc_poll_lock, flags);
 251         setup_timer(&dgnc_poll_timer, dgnc_poll_handler, 0);
 252         dgnc_poll_time = jiffies + dgnc_jiffies_from_ms(dgnc_poll_tick);
 253         dgnc_poll_timer.expires = dgnc_poll_time;
 254         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
 255
 256         add_timer(&dgnc_poll_timer);
 257
 258         return 0;
 259
 260 failed_tty:
 261         device_destroy(dgnc_class, MKDEV(dgnc_Major, 0));
 262 failed_device:
 263         class_destroy(dgnc_class);
 264 failed_class:
 265         unregister_chrdev(dgnc_Major, "dgnc");
 266         return rc;
 267 }
 268
 269 /* returns count (>= 0), or negative on error */
 270 static int dgnc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 271 {
 272         int rc;
 273
 274         /* wake up and enable device */
 275         rc = pci_enable_device(pdev);
 276
 277         if (rc)
 278                 return -EIO;
 279
 280         rc = dgnc_found_board(pdev, ent->driver_data);
 281         if (rc == 0)
 282                 dgnc_NumBoards++;
 283
 284         return rc;
 285 }
 286
 287 /*
 288  * dgnc_cleanup_board()
 289  *
 290  * Free all the memory associated with a board
 291  */
 292 static void dgnc_cleanup_board(struct dgnc_board *brd)
 293 {
 294         int i = 0;
 295
 296         if (!brd || brd->magic != DGNC_BOARD_MAGIC)
 297                 return;
 298
 299         switch (brd->device) {
 300         case PCI_DEVICE_CLASSIC_4_DID:
 301         case PCI_DEVICE_CLASSIC_8_DID:
 302         case PCI_DEVICE_CLASSIC_4_422_DID:
 303         case PCI_DEVICE_CLASSIC_8_422_DID:
 304
 305                 /* Tell card not to interrupt anymore. */
 306                 outb(0, brd->iobase + 0x4c);
 307                 break;
 308
 309         default:
 310                 break;
 311         }
 312
 313         if (brd->irq)
 314                 free_irq(brd->irq, brd);
 315
 316         tasklet_kill(&brd->helper_tasklet);
 317
 318         if (brd->re_map_membase) {
 319                 iounmap(brd->re_map_membase);
 320                 brd->re_map_membase = NULL;
 321         }
 322
 323         if (brd->msgbuf_head) {
 324                 unsigned long flags;
 325
 326                 spin_lock_irqsave(&dgnc_global_lock, flags);
 327                 brd->msgbuf = NULL;
 328                 dev_dbg(&brd->pdev->dev, "%s\n", brd->msgbuf_head);
 329                 kfree(brd->msgbuf_head);
 330                 brd->msgbuf_head = NULL;
 331                 spin_unlock_irqrestore(&dgnc_global_lock, flags);
 332         }
 333
 334         /* Free all allocated channels structs */
 335         for (i = 0; i < MAXPORTS ; i++) {
 336                 if (brd->channels[i]) {
 337                         kfree(brd->channels[i]->ch_rqueue);
 338                         kfree(brd->channels[i]->ch_equeue);
 339                         kfree(brd->channels[i]->ch_wqueue);
 340                         kfree(brd->channels[i]);
 341                         brd->channels[i] = NULL;
 342                 }
 343         }
 344
 345         dgnc_Board[brd->boardnum] = NULL;
 346
 347         kfree(brd);
 348 }
 349
 350 /*
 351  * dgnc_found_board()
 352  *
 353  * A board has been found, init it.
 354  */
 355 static int dgnc_found_board(struct pci_dev *pdev, int id)
 356 {
 357         struct dgnc_board *brd;
 358         unsigned int pci_irq;
 359         int i = 0;
 360         int rc = 0;
 361         unsigned long flags;
 362
 363         /* get the board structure and prep it */
 364         dgnc_Board[dgnc_NumBoards] = kzalloc(sizeof(*brd), GFP_KERNEL);
 365         brd = dgnc_Board[dgnc_NumBoards];
 366
 367         if (!brd)
 368                 return -ENOMEM;
 369
 370         /* make a temporary message buffer for the boot messages */
 371         brd->msgbuf_head = kcalloc(8192, sizeof(u8), GFP_KERNEL);
 372         brd->msgbuf = brd->msgbuf_head;
 373
 374         if (!brd->msgbuf) {
 375                 kfree(brd);
 376                 return -ENOMEM;
 377         }
 378
 379         /* store the info for the board we've found */
 380         brd->magic = DGNC_BOARD_MAGIC;
 381         brd->boardnum = dgnc_NumBoards;
 382         brd->vendor = dgnc_pci_tbl[id].vendor;
 383         brd->device = dgnc_pci_tbl[id].device;
 384         brd->pdev = pdev;
 385         brd->pci_bus = pdev->bus->number;
 386         brd->pci_slot = PCI_SLOT(pdev->devfn);
 387         brd->name = dgnc_Ids[id].name;
 388         brd->maxports = dgnc_Ids[id].maxports;
 389         if (dgnc_Ids[i].is_pci_express)
 390                 brd->bd_flags |= BD_IS_PCI_EXPRESS;
 391         brd->dpastatus = BD_NOFEP;
 392         init_waitqueue_head(&brd->state_wait);
 393
 394         spin_lock_init(&brd->bd_lock);
 395         spin_lock_init(&brd->bd_intr_lock);
 396
 397         brd->state              = BOARD_FOUND;
 398
 399         for (i = 0; i < MAXPORTS; i++)
 400                 brd->channels[i] = NULL;
 401
 402         /* store which card & revision we have */
 403         pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &brd->subvendor);
 404         pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &brd->subdevice);
 405         pci_read_config_byte(pdev, PCI_REVISION_ID, &brd->rev);
 406
 407         pci_irq = pdev->irq;
 408         brd->irq = pci_irq;
 409
 410         switch (brd->device) {
 411         case PCI_DEVICE_CLASSIC_4_DID:
 412         case PCI_DEVICE_CLASSIC_8_DID:
 413         case PCI_DEVICE_CLASSIC_4_422_DID:
 414         case PCI_DEVICE_CLASSIC_8_422_DID:
 415
 416                 brd->dpatype = T_CLASSIC | T_PCIBUS;
 417
 418                 /*
 419                  * For PCI ClassicBoards
 420                  * PCI Local Address (i.e. "resource" number) space
 421                  * 0    PLX Memory Mapped Config
 422                  * 1    PLX I/O Mapped Config
 423                  * 2    I/O Mapped UARTs and Status
 424                  * 3    Memory Mapped VPD
 425                  * 4    Memory Mapped UARTs and Status
 426                  */
 427
 428                 /* get the PCI Base Address Registers */
 429                 brd->membase = pci_resource_start(pdev, 4);
 430
 431                 if (!brd->membase) {
 432                         dev_err(&brd->pdev->dev,
 433                                 "Card has no PCI IO resources, failing.\n");
 434                         return -ENODEV;
 435                 }
 436
 437                 brd->membase_end = pci_resource_end(pdev, 4);
 438
 439                 if (brd->membase & 1)
 440                         brd->membase &= ~3;
 441                 else
 442                         brd->membase &= ~15;
 443
 444                 brd->iobase     = pci_resource_start(pdev, 1);
 445                 brd->iobase_end = pci_resource_end(pdev, 1);
 446                 brd->iobase     = ((unsigned int)(brd->iobase)) & 0xFFFE;
 447
 448                 /* Assign the board_ops struct */
 449                 brd->bd_ops = &dgnc_cls_ops;
 450
 451                 brd->bd_uart_offset = 0x8;
 452                 brd->bd_dividend = 921600;
 453
 454                 dgnc_do_remap(brd);
 455
 456                 /* Get and store the board VPD, if it exists */
 457                 brd->bd_ops->vpd(brd);
 458
 459                 /*
 460                  * Enable Local Interrupt 1               (0x1),
 461                  * Local Interrupt 1 Polarity Active high (0x2),
 462                  * Enable PCI interrupt                   (0x40)
 463                  */
 464                 outb(0x43, brd->iobase + 0x4c);
 465
 466                 break;
 467
 468         case PCI_DEVICE_NEO_4_DID:
 469         case PCI_DEVICE_NEO_8_DID:
 470         case PCI_DEVICE_NEO_2DB9_DID:
 471         case PCI_DEVICE_NEO_2DB9PRI_DID:
 472         case PCI_DEVICE_NEO_2RJ45_DID:
 473         case PCI_DEVICE_NEO_2RJ45PRI_DID:
 474         case PCI_DEVICE_NEO_1_422_DID:
 475         case PCI_DEVICE_NEO_1_422_485_DID:
 476         case PCI_DEVICE_NEO_2_422_485_DID:
 477         case PCI_DEVICE_NEO_EXPRESS_8_DID:
 478         case PCI_DEVICE_NEO_EXPRESS_4_DID:
 479         case PCI_DEVICE_NEO_EXPRESS_4RJ45_DID:
 480         case PCI_DEVICE_NEO_EXPRESS_8RJ45_DID:
 481
 482                 /*
 483                  * This chip is set up 100% when we get to it.
 484                  * No need to enable global interrupts or anything.
 485                  */
 486                 if (brd->bd_flags & BD_IS_PCI_EXPRESS)
 487                         brd->dpatype = T_NEO_EXPRESS | T_PCIBUS;
 488                 else
 489                         brd->dpatype = T_NEO | T_PCIBUS;
 490
 491                 /* get the PCI Base Address Registers */
 492                 brd->membase     = pci_resource_start(pdev, 0);
 493                 brd->membase_end = pci_resource_end(pdev, 0);
 494
 495                 if (brd->membase & 1)
 496                         brd->membase &= ~3;
 497                 else
 498                         brd->membase &= ~15;
 499
 500                 /* Assign the board_ops struct */
 501                 brd->bd_ops = &dgnc_neo_ops;
 502
 503                 brd->bd_uart_offset = 0x200;
 504                 brd->bd_dividend = 921600;
 505
 506                 dgnc_do_remap(brd);
 507
 508                 if (brd->re_map_membase) {
 509                         /* Read and store the dvid after remapping */
 510                         brd->dvid = readb(brd->re_map_membase + 0x8D);
 511
 512                         /* Get and store the board VPD, if it exists */
 513                         brd->bd_ops->vpd(brd);
 514                 }
 515                 break;
 516
 517         default:
 518                 dev_err(&brd->pdev->dev,
 519                         "Didn't find any compatible Neo/Classic PCI boards.\n");
 520                 return -ENXIO;
 521         }
 522
 523         /*
 524          * Do tty device initialization.
 525          */
 526
 527         rc = dgnc_tty_register(brd);
 528         if (rc < 0) {
 529                 pr_err(DRVSTR ": Can't register tty devices (%d)\n", rc);
 530                 goto failed;
 531         }
 532
 533         rc = dgnc_finalize_board_init(brd);
 534         if (rc < 0) {
 535                 pr_err(DRVSTR ": Can't finalize board init (%d)\n", rc);
 536                 goto failed;
 537         }
 538
 539         rc = dgnc_tty_init(brd);
 540         if (rc < 0) {
 541                 pr_err(DRVSTR ": Can't init tty devices (%d)\n", rc);
 542                 goto failed;
 543         }
 544
 545         brd->state = BOARD_READY;
 546         brd->dpastatus = BD_RUNNING;
 547
 548         dgnc_create_ports_sysfiles(brd);
 549
 550         /* init our poll helper tasklet */
 551         tasklet_init(&brd->helper_tasklet,
 552                      brd->bd_ops->tasklet,
 553                      (unsigned long)brd);
 554
 555         spin_lock_irqsave(&dgnc_global_lock, flags);
 556         brd->msgbuf = NULL;
 557         dev_dbg(&brd->pdev->dev, "%s\n", brd->msgbuf_head);
 558         kfree(brd->msgbuf_head);
 559         brd->msgbuf_head = NULL;
 560         spin_unlock_irqrestore(&dgnc_global_lock, flags);
 561
 562         wake_up_interruptible(&brd->state_wait);
 563
 564         return 0;
 565
 566 failed:
 567         dgnc_tty_uninit(brd);
 568         brd->state = BOARD_FAILED;
 569         brd->dpastatus = BD_NOFEP;
 570
 571         return -ENXIO;
 572 }
 573
 574 static int dgnc_finalize_board_init(struct dgnc_board *brd)
 575 {
 576         int rc = 0;
 577
 578         if (!brd || brd->magic != DGNC_BOARD_MAGIC)
 579                 return -ENODEV;
 580
 581         if (brd->irq) {
 582                 rc = request_irq(brd->irq, brd->bd_ops->intr,
 583                                  IRQF_SHARED, "DGNC", brd);
 584
 585                 if (rc) {
 586                         dev_err(&brd->pdev->dev,
 587                                 "Failed to hook IRQ %d\n", brd->irq);
 588                         brd->state = BOARD_FAILED;
 589                         brd->dpastatus = BD_NOFEP;
 590                         rc = -ENODEV;
 591                 }
 592         }
 593         return rc;
 594 }
 595
 596 /*
 597  * Remap PCI memory.
 598  */
 599 static void dgnc_do_remap(struct dgnc_board *brd)
 600 {
 601         if (!brd || brd->magic != DGNC_BOARD_MAGIC)
 602                 return;
 603
 604         brd->re_map_membase = ioremap(brd->membase, 0x1000);
 605 }
 606
 607 /*****************************************************************************
 608 *
 609 * Function:
 610 *
 611 *    dgnc_poll_handler
 612 *
 613 * Author:
 614 *
 615 *    Scott H Kilau
 616 *
 617 * Parameters:
 618 *
 619 *    dummy -- ignored
 620 *
 621 * Return Values:
 622 *
 623 *    none
 624 *
 625 * Description:
 626 *
 627 *    As each timer expires, it determines (a) whether the "transmit"
 628 *    waiter needs to be woken up, and (b) whether the poller needs to
 629 *    be rescheduled.
 630 *
 631 ******************************************************************************/
 632
 633 static void dgnc_poll_handler(ulong dummy)
 634 {
 635         struct dgnc_board *brd;
 636         unsigned long flags;
 637         int i;
 638         unsigned long new_time;
 639
 640         /* Go thru each board, kicking off a tasklet for each if needed */
 641         for (i = 0; i < dgnc_NumBoards; i++) {
 642                 brd = dgnc_Board[i];
 643
 644                 spin_lock_irqsave(&brd->bd_lock, flags);
 645
 646                 /* If board is in a failed state don't schedule a tasklet */
 647                 if (brd->state == BOARD_FAILED) {
 648                         spin_unlock_irqrestore(&brd->bd_lock, flags);
 649                         continue;
 650                 }
 651
 652                 /* Schedule a poll helper task */
 653                 tasklet_schedule(&brd->helper_tasklet);
 654
 655                 spin_unlock_irqrestore(&brd->bd_lock, flags);
 656         }
 657
 658         /*
 659          * Schedule ourself back at the nominal wakeup interval.
 660          */
 661         spin_lock_irqsave(&dgnc_poll_lock, flags);
 662         dgnc_poll_time += dgnc_jiffies_from_ms(dgnc_poll_tick);
 663
 664         new_time = dgnc_poll_time - jiffies;
 665
 666         if ((ulong)new_time >= 2 * dgnc_poll_tick)
 667                 dgnc_poll_time = jiffies + dgnc_jiffies_from_ms(dgnc_poll_tick);
 668
 669         setup_timer(&dgnc_poll_timer, dgnc_poll_handler, 0);
 670         dgnc_poll_timer.expires = dgnc_poll_time;
 671         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
 672
 673         if (!dgnc_poll_stop)
 674                 add_timer(&dgnc_poll_timer);
 675 }