drivers/char/applicom.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Derived from Applicom driver ac.c for SCO Unix                            */
   3 /* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
   4 /* dwmw2@infradead.org 30/8/98                                               */
   5 /* $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $                          */
   6 /* This module is for Linux 2.1 and 2.2 series kernels.                      */
   7 /*****************************************************************************/
   8 /* J PAGET 18/02/94 passage V2.4.2 ioctl avec code 2 reset to les interrupt  */
   9 /* ceci pour reseter correctement apres une sortie sauvage                   */
  10 /* J PAGET 02/05/94 passage V2.4.3 dans le traitement de d'interruption,     */
  11 /* LoopCount n'etait pas initialise a 0.                                     */
  12 /* F LAFORSE 04/07/95 version V2.6.0 lecture bidon apres acces a une carte   */
  13 /*           pour liberer le bus                                             */
  14 /* J.PAGET 19/11/95 version V2.6.1 Nombre, addresse,irq n'est plus configure */
  15 /* et passe en argument a acinit, mais est scrute sur le bus pour s'adapter  */
  16 /* au nombre de cartes presentes sur le bus. IOCL code 6 affichait V2.4.3    */
  17 /* F.LAFORSE 28/11/95 creation de fichiers acXX.o avec les differentes       */
  18 /* addresses de base des cartes, IOCTL 6 plus complet                         */
  19 /* J.PAGET le 19/08/96 copie de la version V2.6 en V2.8.0 sans modification  */
  20 /* de code autre que le texte V2.6.1 en V2.8.0                               */
  21 /*****************************************************************************/
  22
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/sched/signal.h>
  28 #include <linux/slab.h>
  29 #include <linux/errno.h>
  30 #include <linux/mutex.h>
  31 #include <linux/miscdevice.h>
  32 #include <linux/pci.h>
  33 #include <linux/wait.h>
  34 #include <linux/init.h>
  35 #include <linux/fs.h>
  36 #include <linux/nospec.h>
  37
  38 #include <asm/io.h>
  39 #include <linux/uaccess.h>
  40
  41 #include "applicom.h"
  42
  43
  44 /* NOTE: We use for loops with {write,read}b() instead of
  45    memcpy_{from,to}io throughout this driver. This is because
  46    the board doesn't correctly handle word accesses - only
  47    bytes.
  48 */
  49
  50
  51 #undef DEBUG
  52
  53 #define MAX_BOARD 8             /* maximum of pc board possible */
  54 #define MAX_ISA_BOARD 4
  55 #define LEN_RAM_IO 0x800
  56
  57 #ifndef PCI_VENDOR_ID_APPLICOM
  58 #define PCI_VENDOR_ID_APPLICOM                0x1389
  59 #define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
  60 #define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
  61 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
  62 #endif
  63
  64 static DEFINE_MUTEX(ac_mutex);
  65 static char *applicom_pci_devnames[] = {
  66         "PCI board",
  67         "PCI2000IBS / PCI2000CAN",
  68         "PCI2000PFB"
  69 };
  70
  71 static const struct pci_device_id applicom_pci_tbl[] = {
  72         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
  73         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
  74         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },
  75         { 0 }
  76 };
  77 MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);
  78
  79 MODULE_AUTHOR("David Woodhouse & Applicom International");
  80 MODULE_DESCRIPTION("Driver for Applicom Profibus card");
  81 MODULE_LICENSE("GPL");
  82 MODULE_ALIAS_MISCDEV(AC_MINOR);
  83
  84 static struct applicom_board {
  85         unsigned long PhysIO;
  86         void __iomem *RamIO;
  87         wait_queue_head_t FlagSleepSend;
  88         long irq;
  89         spinlock_t mutex;
  90 } apbs[MAX_BOARD];
  91
  92 static unsigned int irq;        /* interrupt number IRQ       */
  93 static unsigned long mem;       /* physical segment of board  */
  94
  95 module_param_hw(irq, uint, irq, 0);
  96 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
  97 module_param_hw(mem, ulong, iomem, 0);
  98 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
  99
 100 static unsigned int numboards;  /* number of installed boards */
 101 static volatile unsigned char Dummy;
 102 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
 103 static unsigned int WriteErrorCount;    /* number of write error      */
 104 static unsigned int ReadErrorCount;     /* number of read error       */
 105 static unsigned int DeviceErrorCount;   /* number of device error     */
 106
 107 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
 108 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
 109 static long ac_ioctl(struct file *, unsigned int, unsigned long);
 110 static irqreturn_t ac_interrupt(int, void *);
 111
 112 static const struct file_operations ac_fops = {
 113         .owner = THIS_MODULE,
 114         .read = ac_read,
 115         .write = ac_write,
 116         .unlocked_ioctl = ac_ioctl,
 117 };
 118
 119 static struct miscdevice ac_miscdev = {
 120         AC_MINOR,
 121         "ac",
 122         &ac_fops
 123 };
 124
 125 static int dummy;       /* dev_id for request_irq() */
 126
 127 static int ac_register_board(unsigned long physloc, void __iomem *loc,
 128                       unsigned char boardno)
 129 {
 130         volatile unsigned char byte_reset_it;
 131
 132         if((readb(loc + CONF_END_TEST)     != 0x00) ||
 133            (readb(loc + CONF_END_TEST + 1) != 0x55) ||
 134            (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
 135            (readb(loc + CONF_END_TEST + 3) != 0xFF))
 136                 return 0;
 137
 138         if (!boardno)
 139                 boardno = readb(loc + NUMCARD_OWNER_TO_PC);
 140
 141         if (!boardno || boardno > MAX_BOARD) {
 142                 printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
 143                        boardno, physloc, MAX_BOARD);
 144                 return 0;
 145         }
 146
 147         if (apbs[boardno - 1].RamIO) {
 148                 printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n",
 149                        boardno, physloc, boardno, apbs[boardno-1].PhysIO);
 150                 return 0;
 151         }
 152
 153         boardno--;
 154
 155         apbs[boardno].PhysIO = physloc;
 156         apbs[boardno].RamIO = loc;
 157         init_waitqueue_head(&apbs[boardno].FlagSleepSend);
 158         spin_lock_init(&apbs[boardno].mutex);
 159         byte_reset_it = readb(loc + RAM_IT_TO_PC);
 160
 161         numboards++;
 162         return boardno + 1;
 163 }
 164
 165 static void __exit applicom_exit(void)
 166 {
 167         unsigned int i;
 168
 169         misc_deregister(&ac_miscdev);
 170
 171         for (i = 0; i < MAX_BOARD; i++) {
 172
 173                 if (!apbs[i].RamIO)
 174                         continue;
 175
 176                 if (apbs[i].irq)
 177                         free_irq(apbs[i].irq, &dummy);
 178
 179                 iounmap(apbs[i].RamIO);
 180         }
 181 }
 182
 183 static int __init applicom_init(void)
 184 {
 185         int i, numisa = 0;
 186         struct pci_dev *dev = NULL;
 187         void __iomem *RamIO;
 188         int boardno, ret;
 189
 190         printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
 191
 192         /* No mem and irq given - check for a PCI card */
 193
 194         while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
 195
 196                 if (!pci_match_id(applicom_pci_tbl, dev))
 197                         continue;
 198
 199                 if (pci_enable_device(dev)) {
 200                         pci_dev_put(dev);
 201                         return -EIO;
 202                 }
 203
 204                 RamIO = ioremap(pci_resource_start(dev, 0), LEN_RAM_IO);
 205
 206                 if (!RamIO) {
 207                         printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
 208                                 "space at 0x%llx\n",
 209                                 (unsigned long long)pci_resource_start(dev, 0));
 210                         pci_disable_device(dev);
 211                         pci_dev_put(dev);
 212                         return -EIO;
 213                 }
 214
 215                 printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
 216                        applicom_pci_devnames[dev->device-1],
 217                            (unsigned long long)pci_resource_start(dev, 0),
 218                        dev->irq);
 219
 220                 boardno = ac_register_board(pci_resource_start(dev, 0),
 221                                 RamIO, 0);
 222                 if (!boardno) {
 223                         printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
 224                         iounmap(RamIO);
 225                         pci_disable_device(dev);
 226                         continue;
 227                 }
 228
 229                 if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
 230                         printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
 231                         iounmap(RamIO);
 232                         pci_disable_device(dev);
 233                         apbs[boardno - 1].RamIO = NULL;
 234                         continue;
 235                 }
 236
 237                 /* Enable interrupts. */
 238
 239                 writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
 240
 241                 apbs[boardno - 1].irq = dev->irq;
 242         }
 243
 244         /* Finished with PCI cards. If none registered,
 245          * and there was no mem/irq specified, exit */
 246
 247         if (!mem || !irq) {
 248                 if (numboards)
 249                         goto fin;
 250                 else {
 251                         printk(KERN_INFO "ac.o: No PCI boards found.\n");
 252                         printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
 253                         return -ENXIO;
 254                 }
 255         }
 256
 257         /* Now try the specified ISA cards */
 258
 259         for (i = 0; i < MAX_ISA_BOARD; i++) {
 260                 RamIO = ioremap(mem + (LEN_RAM_IO * i), LEN_RAM_IO);
 261
 262                 if (!RamIO) {
 263                         printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
 264                         continue;
 265                 }
 266
 267                 if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
 268                                                   RamIO,i+1))) {
 269                         iounmap(RamIO);
 270                         continue;
 271                 }
 272
 273                 printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);
 274
 275                 if (!numisa) {
 276                         if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
 277                                 printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
 278                                 iounmap(RamIO);
 279                                 apbs[boardno - 1].RamIO = NULL;
 280                         }
 281                         else
 282                                 apbs[boardno - 1].irq = irq;
 283                 }
 284                 else
 285                         apbs[boardno - 1].irq = 0;
 286
 287                 numisa++;
 288         }
 289
 290         if (!numisa)
 291                 printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
 292                                 "at mem 0x%lx\n", mem);
 293
 294  fin:
 295         init_waitqueue_head(&FlagSleepRec);
 296
 297         WriteErrorCount = 0;
 298         ReadErrorCount = 0;
 299         DeviceErrorCount = 0;
 300
 301         if (numboards) {
 302                 ret = misc_register(&ac_miscdev);
 303                 if (ret) {
 304                         printk(KERN_WARNING "ac.o: Unable to register misc device\n");
 305                         goto out;
 306                 }
 307                 for (i = 0; i < MAX_BOARD; i++) {
 308                         int serial;
 309                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
 310
 311                         if (!apbs[i].RamIO)
 312                                 continue;
 313
 314                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
 315                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
 316
 317                         boardname[serial] = 0;
 318
 319
 320                         printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
 321                                i+1, boardname,
 322                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
 323                                (int)(readb(apbs[i].RamIO + VERS) & 0xF));
 324
 325                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
 326                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
 327                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
 328
 329                         if (serial != 0)
 330                                 printk(" S/N %d\n", serial);
 331                         else
 332                                 printk("\n");
 333                 }
 334                 return 0;
 335         }
 336
 337         else
 338                 return -ENXIO;
 339
 340 out:
 341         for (i = 0; i < MAX_BOARD; i++) {
 342                 if (!apbs[i].RamIO)
 343                         continue;
 344                 if (apbs[i].irq)
 345                         free_irq(apbs[i].irq, &dummy);
 346                 iounmap(apbs[i].RamIO);
 347         }
 348         return ret;
 349 }
 350
 351 module_init(applicom_init);
 352 module_exit(applicom_exit);
 353
 354
 355 static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
 356 {
 357         unsigned int NumCard;   /* Board number 1 -> 8           */
 358         unsigned int IndexCard; /* Index board number 0 -> 7     */
 359         unsigned char TicCard;  /* Board TIC to send             */
 360         unsigned long flags;    /* Current priority              */
 361         struct st_ram_io st_loc;
 362         struct mailbox tmpmailbox;
 363 #ifdef DEBUG
 364         int c;
 365 #endif
 366         DECLARE_WAITQUEUE(wait, current);
 367
 368         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
 369                 static int warncount = 5;
 370                 if (warncount) {
 371                         printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
 372                                count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
 373                         warncount--;
 374                 }
 375                 return -EINVAL;
 376         }
 377
 378         if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io)))
 379                 return -EFAULT;
 380
 381         if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
 382                           sizeof(struct mailbox)))
 383                 return -EFAULT;
 384
 385         NumCard = st_loc.num_card;      /* board number to send          */
 386         TicCard = st_loc.tic_des_from_pc;       /* tic number to send            */
 387         IndexCard = NumCard - 1;
 388
 389         if (IndexCard >= MAX_BOARD)
 390                 return -EINVAL;
 391         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
 392
 393         if (!apbs[IndexCard].RamIO)
 394                 return -EINVAL;
 395
 396 #ifdef DEBUG
 397         printk("Write to applicom card #%d. struct st_ram_io follows:",
 398                IndexCard+1);
 399
 400                 for (c = 0; c < sizeof(struct st_ram_io);) {
 401
 402                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
 403
 404                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
 405                                 printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
 406                         }
 407                 }
 408
 409                 printk("\nstruct mailbox follows:");
 410
 411                 for (c = 0; c < sizeof(struct mailbox);) {
 412                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
 413
 414                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
 415                                 printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
 416                         }
 417                 }
 418
 419                 printk("\n");
 420 #endif
 421
 422         spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
 423
 424         /* Test octet ready correct */
 425         if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) {
 426                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
 427                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 428                 printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
 429                        IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
 430                 DeviceErrorCount++;
 431                 return -EIO;
 432         }
 433
 434         /* Place ourselves on the wait queue */
 435         set_current_state(TASK_INTERRUPTIBLE);
 436         add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
 437
 438         /* Check whether the card is ready for us */
 439         while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
 440                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
 441                 /* It's busy. Sleep. */
 442
 443                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 444                 schedule();
 445                 if (signal_pending(current)) {
 446                         remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
 447                                           &wait);
 448                         return -EINTR;
 449                 }
 450                 spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
 451                 set_current_state(TASK_INTERRUPTIBLE);
 452         }
 453
 454         /* We may not have actually slept */
 455         set_current_state(TASK_RUNNING);
 456         remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
 457
 458         writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 459
 460         /* Which is best - lock down the pages with rawio and then
 461            copy directly, or use bounce buffers? For now we do the latter
 462            because it works with 2.2 still */
 463         {
 464                 unsigned char *from = (unsigned char *) &tmpmailbox;
 465                 void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
 466                 int c;
 467
 468                 for (c = 0; c < sizeof(struct mailbox); c++)
 469                         writeb(*(from++), to++);
 470         }
 471
 472         writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
 473         writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
 474         writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
 475         writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
 476         writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 477         writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 478         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 479         spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 480         return 0;
 481 }
 482
 483 static int do_ac_read(int IndexCard, char __user *buf,
 484                 struct st_ram_io *st_loc, struct mailbox *mailbox)
 485 {
 486         void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
 487         unsigned char *to = (unsigned char *)mailbox;
 488 #ifdef DEBUG
 489         int c;
 490 #endif
 491
 492         st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
 493         st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
 494
 495
 496         {
 497                 int c;
 498
 499                 for (c = 0; c < sizeof(struct mailbox); c++)
 500                         *(to++) = readb(from++);
 501         }
 502         writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
 503         writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
 504         writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
 505         writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC),
 506                apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
 507         writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
 508         writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
 509         writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 510         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 511
 512 #ifdef DEBUG
 513                 printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
 514
 515                 for (c = 0; c < sizeof(struct st_ram_io);) {
 516                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
 517
 518                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
 519                                 printk(" %2.2X", ((unsigned char *)st_loc)[c]);
 520                         }
 521                 }
 522
 523                 printk("\nstruct mailbox follows:");
 524
 525                 for (c = 0; c < sizeof(struct mailbox);) {
 526                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
 527
 528                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
 529                                 printk(" %2.2X", ((unsigned char *)mailbox)[c]);
 530                         }
 531                 }
 532                 printk("\n");
 533 #endif
 534         return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
 535 }
 536
 537 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
 538 {
 539         unsigned long flags;
 540         unsigned int i;
 541         unsigned char tmp;
 542         int ret = 0;
 543         DECLARE_WAITQUEUE(wait, current);
 544 #ifdef DEBUG
 545         int loopcount=0;
 546 #endif
 547         /* No need to ratelimit this. Only root can trigger it anyway */
 548         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
 549                 printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
 550                         count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
 551                 return -EINVAL;
 552         }
 553
 554         while(1) {
 555                 /* Stick ourself on the wait queue */
 556                 set_current_state(TASK_INTERRUPTIBLE);
 557                 add_wait_queue(&FlagSleepRec, &wait);
 558
 559                 /* Scan each board, looking for one which has a packet for us */
 560                 for (i=0; i < MAX_BOARD; i++) {
 561                         if (!apbs[i].RamIO)
 562                                 continue;
 563                         spin_lock_irqsave(&apbs[i].mutex, flags);
 564
 565                         tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
 566
 567                         if (tmp == 2) {
 568                                 struct st_ram_io st_loc;
 569                                 struct mailbox mailbox;
 570
 571                                 /* Got a packet for us */
 572                                 memset(&st_loc, 0, sizeof(st_loc));
 573                                 ret = do_ac_read(i, buf, &st_loc, &mailbox);
 574                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
 575                                 set_current_state(TASK_RUNNING);
 576                                 remove_wait_queue(&FlagSleepRec, &wait);
 577
 578                                 if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
 579                                         return -EFAULT;
 580                                 if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
 581                                         return -EFAULT;
 582                                 return tmp;
 583                         }
 584
 585                         if (tmp > 2) {
 586                                 /* Got an error */
 587                                 Dummy = readb(apbs[i].RamIO + VERS);
 588
 589                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
 590                                 set_current_state(TASK_RUNNING);
 591                                 remove_wait_queue(&FlagSleepRec, &wait);
 592
 593                                 printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
 594                                        i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
 595                                 DeviceErrorCount++;
 596                                 return -EIO;
 597                         }
 598
 599                         /* Nothing for us. Try the next board */
 600                         Dummy = readb(apbs[i].RamIO + VERS);
 601                         spin_unlock_irqrestore(&apbs[i].mutex, flags);
 602
 603                 } /* per board */
 604
 605                 /* OK - No boards had data for us. Sleep now */
 606
 607                 schedule();
 608                 remove_wait_queue(&FlagSleepRec, &wait);
 609
 610                 if (signal_pending(current))
 611                         return -EINTR;
 612
 613 #ifdef DEBUG
 614                 if (loopcount++ > 2) {
 615                         printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
 616                 }
 617 #endif
 618         }
 619 }
 620
 621 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
 622 {
 623         unsigned int i;
 624         unsigned int FlagInt;
 625         unsigned int LoopCount;
 626         int handled = 0;
 627
 628         //    printk("Applicom interrupt on IRQ %d occurred\n", vec);
 629
 630         LoopCount = 0;
 631
 632         do {
 633                 FlagInt = 0;
 634                 for (i = 0; i < MAX_BOARD; i++) {
 635
 636                         /* Skip if this board doesn't exist */
 637                         if (!apbs[i].RamIO)
 638                                 continue;
 639
 640                         spin_lock(&apbs[i].mutex);
 641
 642                         /* Skip if this board doesn't want attention */
 643                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
 644                                 spin_unlock(&apbs[i].mutex);
 645                                 continue;
 646                         }
 647
 648                         handled = 1;
 649                         FlagInt = 1;
 650                         writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
 651
 652                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
 653                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
 654                                        i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
 655                                 DeviceErrorCount++;
 656                         }
 657
 658                         if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) &&
 659                            (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
 660
 661                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
 662                                        i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
 663                                 DeviceErrorCount++;
 664                         }
 665
 666                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {     /* mailbox sent by the card ?   */
 667                                 if (waitqueue_active(&FlagSleepRec)) {
 668                                 wake_up_interruptible(&FlagSleepRec);
 669                         }
 670                         }
 671
 672                         if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {   /* ram i/o free for write by pc ? */
 673                                 if (waitqueue_active(&apbs[i].FlagSleepSend)) { /* process sleep during read ?    */
 674                                         wake_up_interruptible(&apbs[i].FlagSleepSend);
 675                                 }
 676                         }
 677                         Dummy = readb(apbs[i].RamIO + VERS);
 678
 679                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
 680                                 /* There's another int waiting on this card */
 681                                 spin_unlock(&apbs[i].mutex);
 682                                 i--;
 683                         } else {
 684                                 spin_unlock(&apbs[i].mutex);
 685                         }
 686                 }
 687                 if (FlagInt)
 688                         LoopCount = 0;
 689                 else
 690                         LoopCount++;
 691         } while(LoopCount < 2);
 692         return IRQ_RETVAL(handled);
 693 }
 694
 695
 696
 697 static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 698
 699 {                               /* @ ADG ou ATO selon le cas */
 700         int i;
 701         unsigned char IndexCard;
 702         void __iomem *pmem;
 703         int ret = 0;
 704         static int warncount = 10;
 705         volatile unsigned char byte_reset_it;
 706         struct st_ram_io *adgl;
 707         void __user *argp = (void __user *)arg;
 708
 709         /* In general, the device is only openable by root anyway, so we're not
 710            particularly concerned that bogus ioctls can flood the console. */
 711
 712         adgl = memdup_user(argp, sizeof(struct st_ram_io));
 713         if (IS_ERR(adgl))
 714                 return PTR_ERR(adgl);
 715
 716         mutex_lock(&ac_mutex);
 717         IndexCard = adgl->num_card-1;
 718
 719         if (cmd != 6 && IndexCard >= MAX_BOARD)
 720                 goto err;
 721         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
 722
 723         if (cmd != 6 && !apbs[IndexCard].RamIO)
 724                 goto err;
 725
 726         switch (cmd) {
 727
 728         case 0:
 729                 pmem = apbs[IndexCard].RamIO;
 730                 for (i = 0; i < sizeof(struct st_ram_io); i++)
 731                         ((unsigned char *)adgl)[i]=readb(pmem++);
 732                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
 733                         ret = -EFAULT;
 734                 break;
 735         case 1:
 736                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
 737                 for (i = 0; i < 4; i++)
 738                         adgl->conf_end_test[i] = readb(pmem++);
 739                 for (i = 0; i < 2; i++)
 740                         adgl->error_code[i] = readb(pmem++);
 741                 for (i = 0; i < 4; i++)
 742                         adgl->parameter_error[i] = readb(pmem++);
 743                 pmem = apbs[IndexCard].RamIO + VERS;
 744                 adgl->vers = readb(pmem);
 745                 pmem = apbs[IndexCard].RamIO + TYPE_CARD;
 746                 for (i = 0; i < 20; i++)
 747                         adgl->reserv1[i] = readb(pmem++);
 748                 *(int *)&adgl->reserv1[20] =
 749                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) +
 750                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) +
 751                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );
 752
 753                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
 754                         ret = -EFAULT;
 755                 break;
 756         case 2:
 757                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
 758                 for (i = 0; i < 10; i++)
 759                         writeb(0xff, pmem++);
 760                 writeb(adgl->data_from_pc_ready,
 761                        apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 762
 763                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 764
 765                 for (i = 0; i < MAX_BOARD; i++) {
 766                         if (apbs[i].RamIO) {
 767                                 byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
 768                         }
 769                 }
 770                 break;
 771         case 3:
 772                 pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
 773                 writeb(adgl->tic_des_from_pc, pmem);
 774                 break;
 775         case 4:
 776                 pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
 777                 adgl->tic_owner_to_pc     = readb(pmem++);
 778                 adgl->numcard_owner_to_pc = readb(pmem);
 779                 if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
 780                         ret = -EFAULT;
 781                 break;
 782         case 5:
 783                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
 784                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
 785                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
 786                 writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 787                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 788                 break;
 789         case 6:
 790                 printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)\n");
 791                 printk(KERN_INFO "Number of installed boards . %d\n", (int) numboards);
 792                 printk(KERN_INFO "Segment of board ........... %X\n", (int) mem);
 793                 printk(KERN_INFO "Interrupt IRQ number ....... %d\n", (int) irq);
 794                 for (i = 0; i < MAX_BOARD; i++) {
 795                         int serial;
 796                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
 797
 798                         if (!apbs[i].RamIO)
 799                                 continue;
 800
 801                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
 802                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
 803                         boardname[serial] = 0;
 804
 805                         printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
 806                                i+1,
 807                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
 808                                (int)(readb(apbs[i].RamIO + VERS) & 0xF),
 809                                boardname);
 810
 811
 812                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
 813                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
 814                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
 815
 816                         if (serial != 0)
 817                                 printk(" S/N %d\n", serial);
 818                         else
 819                                 printk("\n");
 820                 }
 821                 if (DeviceErrorCount != 0)
 822                         printk(KERN_INFO "DeviceErrorCount ........... %d\n", DeviceErrorCount);
 823                 if (ReadErrorCount != 0)
 824                         printk(KERN_INFO "ReadErrorCount ............. %d\n", ReadErrorCount);
 825                 if (WriteErrorCount != 0)
 826                         printk(KERN_INFO "WriteErrorCount ............ %d\n", WriteErrorCount);
 827                 if (waitqueue_active(&FlagSleepRec))
 828                         printk(KERN_INFO "Process in read pending\n");
 829                 for (i = 0; i < MAX_BOARD; i++) {
 830                         if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
 831                                 printk(KERN_INFO "Process in write pending board %d\n",i+1);
 832                 }
 833                 break;
 834         default:
 835                 ret = -ENOTTY;
 836                 break;
 837         }
 838         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 839         kfree(adgl);
 840         mutex_unlock(&ac_mutex);
 841         return ret;
 842
 843 err:
 844         if (warncount) {
 845                 pr_warn("APPLICOM driver IOCTL, bad board number %d\n",
 846                         (int)IndexCard + 1);
 847                 warncount--;
 848         }
 849         kfree(adgl);
 850         mutex_unlock(&ac_mutex);
 851         return -EINVAL;
 852
 853 }
 854