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