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 MODULE_SUPPORTED_DEVICE("ac");
  85
  86
  87 static struct applicom_board {
  88         unsigned long PhysIO;
  89         void __iomem *RamIO;
  90         wait_queue_head_t FlagSleepSend;
  91         long irq;
  92         spinlock_t mutex;
  93 } apbs[MAX_BOARD];
  94
  95 static unsigned int irq = 0;    /* interrupt number IRQ       */
  96 static unsigned long mem = 0;   /* physical segment of board  */
  97
  98 module_param_hw(irq, uint, irq, 0);
  99 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
 100 module_param_hw(mem, ulong, iomem, 0);
 101 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
 102
 103 static unsigned int numboards;  /* number of installed boards */
 104 static volatile unsigned char Dummy;
 105 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
 106 static unsigned int WriteErrorCount;    /* number of write error      */
 107 static unsigned int ReadErrorCount;     /* number of read error       */
 108 static unsigned int DeviceErrorCount;   /* number of device error     */
 109
 110 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
 111 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
 112 static long ac_ioctl(struct file *, unsigned int, unsigned long);
 113 static irqreturn_t ac_interrupt(int, void *);
 114
 115 static const struct file_operations ac_fops = {
 116         .owner = THIS_MODULE,
 117         .llseek = no_llseek,
 118         .read = ac_read,
 119         .write = ac_write,
 120         .unlocked_ioctl = ac_ioctl,
 121 };
 122
 123 static struct miscdevice ac_miscdev = {
 124         AC_MINOR,
 125         "ac",
 126         &ac_fops
 127 };
 128
 129 static int dummy;       /* dev_id for request_irq() */
 130
 131 static int ac_register_board(unsigned long physloc, void __iomem *loc,
 132                       unsigned char boardno)
 133 {
 134         volatile unsigned char byte_reset_it;
 135
 136         if((readb(loc + CONF_END_TEST)     != 0x00) ||
 137            (readb(loc + CONF_END_TEST + 1) != 0x55) ||
 138            (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
 139            (readb(loc + CONF_END_TEST + 3) != 0xFF))
 140                 return 0;
 141
 142         if (!boardno)
 143                 boardno = readb(loc + NUMCARD_OWNER_TO_PC);
 144
 145         if (!boardno || boardno > MAX_BOARD) {
 146                 printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
 147                        boardno, physloc, MAX_BOARD);
 148                 return 0;
 149         }
 150
 151         if (apbs[boardno - 1].RamIO) {
 152                 printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n",
 153                        boardno, physloc, boardno, apbs[boardno-1].PhysIO);
 154                 return 0;
 155         }
 156
 157         boardno--;
 158
 159         apbs[boardno].PhysIO = physloc;
 160         apbs[boardno].RamIO = loc;
 161         init_waitqueue_head(&apbs[boardno].FlagSleepSend);
 162         spin_lock_init(&apbs[boardno].mutex);
 163         byte_reset_it = readb(loc + RAM_IT_TO_PC);
 164
 165         numboards++;
 166         return boardno + 1;
 167 }
 168
 169 static void __exit applicom_exit(void)
 170 {
 171         unsigned int i;
 172
 173         misc_deregister(&ac_miscdev);
 174
 175         for (i = 0; i < MAX_BOARD; i++) {
 176
 177                 if (!apbs[i].RamIO)
 178                         continue;
 179
 180                 if (apbs[i].irq)
 181                         free_irq(apbs[i].irq, &dummy);
 182
 183                 iounmap(apbs[i].RamIO);
 184         }
 185 }
 186
 187 static int __init applicom_init(void)
 188 {
 189         int i, numisa = 0;
 190         struct pci_dev *dev = NULL;
 191         void __iomem *RamIO;
 192         int boardno, ret;
 193
 194         printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
 195
 196         /* No mem and irq given - check for a PCI card */
 197
 198         while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
 199
 200                 if (!pci_match_id(applicom_pci_tbl, dev))
 201                         continue;
 202
 203                 if (pci_enable_device(dev))
 204                         return -EIO;
 205
 206                 RamIO = ioremap(pci_resource_start(dev, 0), LEN_RAM_IO);
 207
 208                 if (!RamIO) {
 209                         printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
 210                                 "space at 0x%llx\n",
 211                                 (unsigned long long)pci_resource_start(dev, 0));
 212                         pci_disable_device(dev);
 213                         return -EIO;
 214                 }
 215
 216                 printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
 217                        applicom_pci_devnames[dev->device-1],
 218                            (unsigned long long)pci_resource_start(dev, 0),
 219                        dev->irq);
 220
 221                 boardno = ac_register_board(pci_resource_start(dev, 0),
 222                                 RamIO, 0);
 223                 if (!boardno) {
 224                         printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
 225                         iounmap(RamIO);
 226                         pci_disable_device(dev);
 227                         continue;
 228                 }
 229
 230                 if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
 231                         printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
 232                         iounmap(RamIO);
 233                         pci_disable_device(dev);
 234                         apbs[boardno - 1].RamIO = NULL;
 235                         continue;
 236                 }
 237
 238                 /* Enable interrupts. */
 239
 240                 writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
 241
 242                 apbs[boardno - 1].irq = dev->irq;
 243         }
 244
 245         /* Finished with PCI cards. If none registered,
 246          * and there was no mem/irq specified, exit */
 247
 248         if (!mem || !irq) {
 249                 if (numboards)
 250                         goto fin;
 251                 else {
 252                         printk(KERN_INFO "ac.o: No PCI boards found.\n");
 253                         printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
 254                         return -ENXIO;
 255                 }
 256         }
 257
 258         /* Now try the specified ISA cards */
 259
 260         for (i = 0; i < MAX_ISA_BOARD; i++) {
 261                 RamIO = ioremap(mem + (LEN_RAM_IO * i), LEN_RAM_IO);
 262
 263                 if (!RamIO) {
 264                         printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
 265                         continue;
 266                 }
 267
 268                 if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
 269                                                   RamIO,i+1))) {
 270                         iounmap(RamIO);
 271                         continue;
 272                 }
 273
 274                 printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);
 275
 276                 if (!numisa) {
 277                         if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
 278                                 printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
 279                                 iounmap(RamIO);
 280                                 apbs[boardno - 1].RamIO = NULL;
 281                         }
 282                         else
 283                                 apbs[boardno - 1].irq = irq;
 284                 }
 285                 else
 286                         apbs[boardno - 1].irq = 0;
 287
 288                 numisa++;
 289         }
 290
 291         if (!numisa)
 292                 printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
 293                                 "at mem 0x%lx\n", mem);
 294
 295  fin:
 296         init_waitqueue_head(&FlagSleepRec);
 297
 298         WriteErrorCount = 0;
 299         ReadErrorCount = 0;
 300         DeviceErrorCount = 0;
 301
 302         if (numboards) {
 303                 ret = misc_register(&ac_miscdev);
 304                 if (ret) {
 305                         printk(KERN_WARNING "ac.o: Unable to register misc device\n");
 306                         goto out;
 307                 }
 308                 for (i = 0; i < MAX_BOARD; i++) {
 309                         int serial;
 310                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
 311
 312                         if (!apbs[i].RamIO)
 313                                 continue;
 314
 315                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
 316                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
 317
 318                         boardname[serial] = 0;
 319
 320
 321                         printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
 322                                i+1, boardname,
 323                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
 324                                (int)(readb(apbs[i].RamIO + VERS) & 0xF));
 325
 326                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
 327                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
 328                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
 329
 330                         if (serial != 0)
 331                                 printk(" S/N %d\n", serial);
 332                         else
 333                                 printk("\n");
 334                 }
 335                 return 0;
 336         }
 337
 338         else
 339                 return -ENXIO;
 340
 341 out:
 342         for (i = 0; i < MAX_BOARD; i++) {
 343                 if (!apbs[i].RamIO)
 344                         continue;
 345                 if (apbs[i].irq)
 346                         free_irq(apbs[i].irq, &dummy);
 347                 iounmap(apbs[i].RamIO);
 348         }
 349         return ret;
 350 }
 351
 352 module_init(applicom_init);
 353 module_exit(applicom_exit);
 354
 355
 356 static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
 357 {
 358         unsigned int NumCard;   /* Board number 1 -> 8           */
 359         unsigned int IndexCard; /* Index board number 0 -> 7     */
 360         unsigned char TicCard;  /* Board TIC to send             */
 361         unsigned long flags;    /* Current priority              */
 362         struct st_ram_io st_loc;
 363         struct mailbox tmpmailbox;
 364 #ifdef DEBUG
 365         int c;
 366 #endif
 367         DECLARE_WAITQUEUE(wait, current);
 368
 369         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
 370                 static int warncount = 5;
 371                 if (warncount) {
 372                         printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
 373                                count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
 374                         warncount--;
 375                 }
 376                 return -EINVAL;
 377         }
 378
 379         if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io)))
 380                 return -EFAULT;
 381
 382         if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
 383                           sizeof(struct mailbox)))
 384                 return -EFAULT;
 385
 386         NumCard = st_loc.num_card;      /* board number to send          */
 387         TicCard = st_loc.tic_des_from_pc;       /* tic number to send            */
 388         IndexCard = NumCard - 1;
 389
 390         if (IndexCard >= MAX_BOARD)
 391                 return -EINVAL;
 392         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
 393
 394         if (!apbs[IndexCard].RamIO)
 395                 return -EINVAL;
 396
 397 #ifdef DEBUG
 398         printk("Write to applicom card #%d. struct st_ram_io follows:",
 399                IndexCard+1);
 400
 401                 for (c = 0; c < sizeof(struct st_ram_io);) {
 402
 403                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
 404
 405                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
 406                                 printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
 407                         }
 408                 }
 409
 410                 printk("\nstruct mailbox follows:");
 411
 412                 for (c = 0; c < sizeof(struct mailbox);) {
 413                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
 414
 415                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
 416                                 printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
 417                         }
 418                 }
 419
 420                 printk("\n");
 421 #endif
 422
 423         spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
 424
 425         /* Test octet ready correct */
 426         if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) {
 427                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
 428                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 429                 printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
 430                        IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
 431                 DeviceErrorCount++;
 432                 return -EIO;
 433         }
 434
 435         /* Place ourselves on the wait queue */
 436         set_current_state(TASK_INTERRUPTIBLE);
 437         add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
 438
 439         /* Check whether the card is ready for us */
 440         while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
 441                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
 442                 /* It's busy. Sleep. */
 443
 444                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 445                 schedule();
 446                 if (signal_pending(current)) {
 447                         remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
 448                                           &wait);
 449                         return -EINTR;
 450                 }
 451                 spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
 452                 set_current_state(TASK_INTERRUPTIBLE);
 453         }
 454
 455         /* We may not have actually slept */
 456         set_current_state(TASK_RUNNING);
 457         remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
 458
 459         writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 460
 461         /* Which is best - lock down the pages with rawio and then
 462            copy directly, or use bounce buffers? For now we do the latter
 463            because it works with 2.2 still */
 464         {
 465                 unsigned char *from = (unsigned char *) &tmpmailbox;
 466                 void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
 467                 int c;
 468
 469                 for (c = 0; c < sizeof(struct mailbox); c++)
 470                         writeb(*(from++), to++);
 471         }
 472
 473         writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
 474         writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
 475         writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
 476         writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
 477         writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 478         writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 479         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 480         spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 481         return 0;
 482 }
 483
 484 static int do_ac_read(int IndexCard, char __user *buf,
 485                 struct st_ram_io *st_loc, struct mailbox *mailbox)
 486 {
 487         void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
 488         unsigned char *to = (unsigned char *)mailbox;
 489 #ifdef DEBUG
 490         int c;
 491 #endif
 492
 493         st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
 494         st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
 495
 496
 497         {
 498                 int c;
 499
 500                 for (c = 0; c < sizeof(struct mailbox); c++)
 501                         *(to++) = readb(from++);
 502         }
 503         writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
 504         writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
 505         writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
 506         writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC),
 507                apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
 508         writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
 509         writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
 510         writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 511         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 512
 513 #ifdef DEBUG
 514                 printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
 515
 516                 for (c = 0; c < sizeof(struct st_ram_io);) {
 517                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
 518
 519                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
 520                                 printk(" %2.2X", ((unsigned char *)st_loc)[c]);
 521                         }
 522                 }
 523
 524                 printk("\nstruct mailbox follows:");
 525
 526                 for (c = 0; c < sizeof(struct mailbox);) {
 527                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
 528
 529                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
 530                                 printk(" %2.2X", ((unsigned char *)mailbox)[c]);
 531                         }
 532                 }
 533                 printk("\n");
 534 #endif
 535         return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
 536 }
 537
 538 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
 539 {
 540         unsigned long flags;
 541         unsigned int i;
 542         unsigned char tmp;
 543         int ret = 0;
 544         DECLARE_WAITQUEUE(wait, current);
 545 #ifdef DEBUG
 546         int loopcount=0;
 547 #endif
 548         /* No need to ratelimit this. Only root can trigger it anyway */
 549         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
 550                 printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
 551                         count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
 552                 return -EINVAL;
 553         }
 554
 555         while(1) {
 556                 /* Stick ourself on the wait queue */
 557                 set_current_state(TASK_INTERRUPTIBLE);
 558                 add_wait_queue(&FlagSleepRec, &wait);
 559
 560                 /* Scan each board, looking for one which has a packet for us */
 561                 for (i=0; i < MAX_BOARD; i++) {
 562                         if (!apbs[i].RamIO)
 563                                 continue;
 564                         spin_lock_irqsave(&apbs[i].mutex, flags);
 565
 566                         tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
 567
 568                         if (tmp == 2) {
 569                                 struct st_ram_io st_loc;
 570                                 struct mailbox mailbox;
 571
 572                                 /* Got a packet for us */
 573                                 memset(&st_loc, 0, sizeof(st_loc));
 574                                 ret = do_ac_read(i, buf, &st_loc, &mailbox);
 575                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
 576                                 set_current_state(TASK_RUNNING);
 577                                 remove_wait_queue(&FlagSleepRec, &wait);
 578
 579                                 if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
 580                                         return -EFAULT;
 581                                 if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
 582                                         return -EFAULT;
 583                                 return tmp;
 584                         }
 585
 586                         if (tmp > 2) {
 587                                 /* Got an error */
 588                                 Dummy = readb(apbs[i].RamIO + VERS);
 589
 590                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
 591                                 set_current_state(TASK_RUNNING);
 592                                 remove_wait_queue(&FlagSleepRec, &wait);
 593
 594                                 printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
 595                                        i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
 596                                 DeviceErrorCount++;
 597                                 return -EIO;
 598                         }
 599
 600                         /* Nothing for us. Try the next board */
 601                         Dummy = readb(apbs[i].RamIO + VERS);
 602                         spin_unlock_irqrestore(&apbs[i].mutex, flags);
 603
 604                 } /* per board */
 605
 606                 /* OK - No boards had data for us. Sleep now */
 607
 608                 schedule();
 609                 remove_wait_queue(&FlagSleepRec, &wait);
 610
 611                 if (signal_pending(current))
 612                         return -EINTR;
 613
 614 #ifdef DEBUG
 615                 if (loopcount++ > 2) {
 616                         printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
 617                 }
 618 #endif
 619         }
 620 }
 621
 622 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
 623 {
 624         unsigned int i;
 625         unsigned int FlagInt;
 626         unsigned int LoopCount;
 627         int handled = 0;
 628
 629         //    printk("Applicom interrupt on IRQ %d occurred\n", vec);
 630
 631         LoopCount = 0;
 632
 633         do {
 634                 FlagInt = 0;
 635                 for (i = 0; i < MAX_BOARD; i++) {
 636
 637                         /* Skip if this board doesn't exist */
 638                         if (!apbs[i].RamIO)
 639                                 continue;
 640
 641                         spin_lock(&apbs[i].mutex);
 642
 643                         /* Skip if this board doesn't want attention */
 644                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
 645                                 spin_unlock(&apbs[i].mutex);
 646                                 continue;
 647                         }
 648
 649                         handled = 1;
 650                         FlagInt = 1;
 651                         writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
 652
 653                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
 654                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
 655                                        i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
 656                                 DeviceErrorCount++;
 657                         }
 658
 659                         if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) &&
 660                            (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
 661
 662                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
 663                                        i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
 664                                 DeviceErrorCount++;
 665                         }
 666
 667                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {     /* mailbox sent by the card ?   */
 668                                 if (waitqueue_active(&FlagSleepRec)) {
 669                                 wake_up_interruptible(&FlagSleepRec);
 670                         }
 671                         }
 672
 673                         if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {   /* ram i/o free for write by pc ? */
 674                                 if (waitqueue_active(&apbs[i].FlagSleepSend)) { /* process sleep during read ?    */
 675                                         wake_up_interruptible(&apbs[i].FlagSleepSend);
 676                                 }
 677                         }
 678                         Dummy = readb(apbs[i].RamIO + VERS);
 679
 680                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
 681                                 /* There's another int waiting on this card */
 682                                 spin_unlock(&apbs[i].mutex);
 683                                 i--;
 684                         } else {
 685                                 spin_unlock(&apbs[i].mutex);
 686                         }
 687                 }
 688                 if (FlagInt)
 689                         LoopCount = 0;
 690                 else
 691                         LoopCount++;
 692         } while(LoopCount < 2);
 693         return IRQ_RETVAL(handled);
 694 }
 695
 696
 697
 698 static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 699
 700 {                               /* @ ADG ou ATO selon le cas */
 701         int i;
 702         unsigned char IndexCard;
 703         void __iomem *pmem;
 704         int ret = 0;
 705         static int warncount = 10;
 706         volatile unsigned char byte_reset_it;
 707         struct st_ram_io *adgl;
 708         void __user *argp = (void __user *)arg;
 709
 710         /* In general, the device is only openable by root anyway, so we're not
 711            particularly concerned that bogus ioctls can flood the console. */
 712
 713         adgl = memdup_user(argp, sizeof(struct st_ram_io));
 714         if (IS_ERR(adgl))
 715                 return PTR_ERR(adgl);
 716
 717         mutex_lock(&ac_mutex);
 718         IndexCard = adgl->num_card-1;
 719
 720         if (cmd != 6 && IndexCard >= MAX_BOARD)
 721                 goto err;
 722         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
 723
 724         if (cmd != 6 && !apbs[IndexCard].RamIO)
 725                 goto err;
 726
 727         switch (cmd) {
 728
 729         case 0:
 730                 pmem = apbs[IndexCard].RamIO;
 731                 for (i = 0; i < sizeof(struct st_ram_io); i++)
 732                         ((unsigned char *)adgl)[i]=readb(pmem++);
 733                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
 734                         ret = -EFAULT;
 735                 break;
 736         case 1:
 737                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
 738                 for (i = 0; i < 4; i++)
 739                         adgl->conf_end_test[i] = readb(pmem++);
 740                 for (i = 0; i < 2; i++)
 741                         adgl->error_code[i] = readb(pmem++);
 742                 for (i = 0; i < 4; i++)
 743                         adgl->parameter_error[i] = readb(pmem++);
 744                 pmem = apbs[IndexCard].RamIO + VERS;
 745                 adgl->vers = readb(pmem);
 746                 pmem = apbs[IndexCard].RamIO + TYPE_CARD;
 747                 for (i = 0; i < 20; i++)
 748                         adgl->reserv1[i] = readb(pmem++);
 749                 *(int *)&adgl->reserv1[20] =
 750                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) +
 751                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) +
 752                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );
 753
 754                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
 755                         ret = -EFAULT;
 756                 break;
 757         case 2:
 758                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
 759                 for (i = 0; i < 10; i++)
 760                         writeb(0xff, pmem++);
 761                 writeb(adgl->data_from_pc_ready,
 762                        apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 763
 764                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 765
 766                 for (i = 0; i < MAX_BOARD; i++) {
 767                         if (apbs[i].RamIO) {
 768                                 byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
 769                         }
 770                 }
 771                 break;
 772         case 3:
 773                 pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
 774                 writeb(adgl->tic_des_from_pc, pmem);
 775                 break;
 776         case 4:
 777                 pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
 778                 adgl->tic_owner_to_pc     = readb(pmem++);
 779                 adgl->numcard_owner_to_pc = readb(pmem);
 780                 if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
 781                         ret = -EFAULT;
 782                 break;
 783         case 5:
 784                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
 785                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
 786                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
 787                 writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 788                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 789                 break;
 790         case 6:
 791                 printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)\n");
 792                 printk(KERN_INFO "Number of installed boards . %d\n", (int) numboards);
 793                 printk(KERN_INFO "Segment of board ........... %X\n", (int) mem);
 794                 printk(KERN_INFO "Interrupt IRQ number ....... %d\n", (int) irq);
 795                 for (i = 0; i < MAX_BOARD; i++) {
 796                         int serial;
 797                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
 798
 799                         if (!apbs[i].RamIO)
 800                                 continue;
 801
 802                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
 803                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
 804                         boardname[serial] = 0;
 805
 806                         printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
 807                                i+1,
 808                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
 809                                (int)(readb(apbs[i].RamIO + VERS) & 0xF),
 810                                boardname);
 811
 812
 813                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
 814                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
 815                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
 816
 817                         if (serial != 0)
 818                                 printk(" S/N %d\n", serial);
 819                         else
 820                                 printk("\n");
 821                 }
 822                 if (DeviceErrorCount != 0)
 823                         printk(KERN_INFO "DeviceErrorCount ........... %d\n", DeviceErrorCount);
 824                 if (ReadErrorCount != 0)
 825                         printk(KERN_INFO "ReadErrorCount ............. %d\n", ReadErrorCount);
 826                 if (WriteErrorCount != 0)
 827                         printk(KERN_INFO "WriteErrorCount ............ %d\n", WriteErrorCount);
 828                 if (waitqueue_active(&FlagSleepRec))
 829                         printk(KERN_INFO "Process in read pending\n");
 830                 for (i = 0; i < MAX_BOARD; i++) {
 831                         if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
 832                                 printk(KERN_INFO "Process in write pending board %d\n",i+1);
 833                 }
 834                 break;
 835         default:
 836                 ret = -ENOTTY;
 837                 break;
 838         }
 839         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 840         kfree(adgl);
 841         mutex_unlock(&ac_mutex);
 842         return 0;
 843
 844 err:
 845         if (warncount) {
 846                 pr_warn("APPLICOM driver IOCTL, bad board number %d\n",
 847                         (int)IndexCard + 1);
 848                 warncount--;
 849         }
 850         kfree(adgl);
 851         mutex_unlock(&ac_mutex);
 852         return -EINVAL;
 853
 854 }
 855