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 #define AC_MINOR 157
  57
  58 #ifndef PCI_VENDOR_ID_APPLICOM
  59 #define PCI_VENDOR_ID_APPLICOM                0x1389
  60 #define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
  61 #define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
  62 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
  63 #endif
  64
  65 static DEFINE_MUTEX(ac_mutex);
  66 static char *applicom_pci_devnames[] = {
  67         "PCI board",
  68         "PCI2000IBS / PCI2000CAN",
  69         "PCI2000PFB"
  70 };
  71
  72 static const struct pci_device_id applicom_pci_tbl[] = {
  73         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
  74         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
  75         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },
  76         { 0 }
  77 };
  78 MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);
  79
  80 MODULE_AUTHOR("David Woodhouse & Applicom International");
  81 MODULE_DESCRIPTION("Driver for Applicom Profibus card");
  82 MODULE_LICENSE("GPL");
  83 MODULE_ALIAS_MISCDEV(AC_MINOR);
  84
  85 MODULE_SUPPORTED_DEVICE("ac");
  86
  87
  88 static struct applicom_board {
  89         unsigned long PhysIO;
  90         void __iomem *RamIO;
  91         wait_queue_head_t FlagSleepSend;
  92         long irq;
  93         spinlock_t mutex;
  94 } apbs[MAX_BOARD];
  95
  96 static unsigned int irq = 0;    /* interrupt number IRQ       */
  97 static unsigned long mem = 0;   /* physical segment of board  */
  98
  99 module_param_hw(irq, uint, irq, 0);
 100 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
 101 module_param_hw(mem, ulong, iomem, 0);
 102 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
 103
 104 static unsigned int numboards;  /* number of installed boards */
 105 static volatile unsigned char Dummy;
 106 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
 107 static unsigned int WriteErrorCount;    /* number of write error      */
 108 static unsigned int ReadErrorCount;     /* number of read error       */
 109 static unsigned int DeviceErrorCount;   /* number of device error     */
 110
 111 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
 112 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
 113 static long ac_ioctl(struct file *, unsigned int, unsigned long);
 114 static irqreturn_t ac_interrupt(int, void *);
 115
 116 static const struct file_operations ac_fops = {
 117         .owner = THIS_MODULE,
 118         .llseek = no_llseek,
 119         .read = ac_read,
 120         .write = ac_write,
 121         .unlocked_ioctl = ac_ioctl,
 122 };
 123
 124 static struct miscdevice ac_miscdev = {
 125         AC_MINOR,
 126         "ac",
 127         &ac_fops
 128 };
 129
 130 static int dummy;       /* dev_id for request_irq() */
 131
 132 static int ac_register_board(unsigned long physloc, void __iomem *loc,
 133                       unsigned char boardno)
 134 {
 135         volatile unsigned char byte_reset_it;
 136
 137         if((readb(loc + CONF_END_TEST)     != 0x00) ||
 138            (readb(loc + CONF_END_TEST + 1) != 0x55) ||
 139            (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
 140            (readb(loc + CONF_END_TEST + 3) != 0xFF))
 141                 return 0;
 142
 143         if (!boardno)
 144                 boardno = readb(loc + NUMCARD_OWNER_TO_PC);
 145
 146         if (!boardno || boardno > MAX_BOARD) {
 147                 printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
 148                        boardno, physloc, MAX_BOARD);
 149                 return 0;
 150         }
 151
 152         if (apbs[boardno - 1].RamIO) {
 153                 printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n",
 154                        boardno, physloc, boardno, apbs[boardno-1].PhysIO);
 155                 return 0;
 156         }
 157
 158         boardno--;
 159
 160         apbs[boardno].PhysIO = physloc;
 161         apbs[boardno].RamIO = loc;
 162         init_waitqueue_head(&apbs[boardno].FlagSleepSend);
 163         spin_lock_init(&apbs[boardno].mutex);
 164         byte_reset_it = readb(loc + RAM_IT_TO_PC);
 165
 166         numboards++;
 167         return boardno + 1;
 168 }
 169
 170 static void __exit applicom_exit(void)
 171 {
 172         unsigned int i;
 173
 174         misc_deregister(&ac_miscdev);
 175
 176         for (i = 0; i < MAX_BOARD; i++) {
 177
 178                 if (!apbs[i].RamIO)
 179                         continue;
 180
 181                 if (apbs[i].irq)
 182                         free_irq(apbs[i].irq, &dummy);
 183
 184                 iounmap(apbs[i].RamIO);
 185         }
 186 }
 187
 188 static int __init applicom_init(void)
 189 {
 190         int i, numisa = 0;
 191         struct pci_dev *dev = NULL;
 192         void __iomem *RamIO;
 193         int boardno, ret;
 194
 195         printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
 196
 197         /* No mem and irq given - check for a PCI card */
 198
 199         while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
 200
 201                 if (!pci_match_id(applicom_pci_tbl, dev))
 202                         continue;
 203
 204                 if (pci_enable_device(dev))
 205                         return -EIO;
 206
 207                 RamIO = ioremap_nocache(pci_resource_start(dev, 0), LEN_RAM_IO);
 208
 209                 if (!RamIO) {
 210                         printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
 211                                 "space at 0x%llx\n",
 212                                 (unsigned long long)pci_resource_start(dev, 0));
 213                         pci_disable_device(dev);
 214                         return -EIO;
 215                 }
 216
 217                 printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
 218                        applicom_pci_devnames[dev->device-1],
 219                            (unsigned long long)pci_resource_start(dev, 0),
 220                        dev->irq);
 221
 222                 boardno = ac_register_board(pci_resource_start(dev, 0),
 223                                 RamIO, 0);
 224                 if (!boardno) {
 225                         printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
 226                         iounmap(RamIO);
 227                         pci_disable_device(dev);
 228                         continue;
 229                 }
 230
 231                 if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
 232                         printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
 233                         iounmap(RamIO);
 234                         pci_disable_device(dev);
 235                         apbs[boardno - 1].RamIO = NULL;
 236                         continue;
 237                 }
 238
 239                 /* Enable interrupts. */
 240
 241                 writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
 242
 243                 apbs[boardno - 1].irq = dev->irq;
 244         }
 245
 246         /* Finished with PCI cards. If none registered,
 247          * and there was no mem/irq specified, exit */
 248
 249         if (!mem || !irq) {
 250                 if (numboards)
 251                         goto fin;
 252                 else {
 253                         printk(KERN_INFO "ac.o: No PCI boards found.\n");
 254                         printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
 255                         return -ENXIO;
 256                 }
 257         }
 258
 259         /* Now try the specified ISA cards */
 260
 261         for (i = 0; i < MAX_ISA_BOARD; i++) {
 262                 RamIO = ioremap_nocache(mem + (LEN_RAM_IO * i), LEN_RAM_IO);
 263
 264                 if (!RamIO) {
 265                         printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
 266                         continue;
 267                 }
 268
 269                 if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
 270                                                   RamIO,i+1))) {
 271                         iounmap(RamIO);
 272                         continue;
 273                 }
 274
 275                 printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);
 276
 277                 if (!numisa) {
 278                         if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
 279                                 printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
 280                                 iounmap(RamIO);
 281                                 apbs[boardno - 1].RamIO = NULL;
 282                         }
 283                         else
 284                                 apbs[boardno - 1].irq = irq;
 285                 }
 286                 else
 287                         apbs[boardno - 1].irq = 0;
 288
 289                 numisa++;
 290         }
 291
 292         if (!numisa)
 293                 printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
 294                                 "at mem 0x%lx\n", mem);
 295
 296  fin:
 297         init_waitqueue_head(&FlagSleepRec);
 298
 299         WriteErrorCount = 0;
 300         ReadErrorCount = 0;
 301         DeviceErrorCount = 0;
 302
 303         if (numboards) {
 304                 ret = misc_register(&ac_miscdev);
 305                 if (ret) {
 306                         printk(KERN_WARNING "ac.o: Unable to register misc device\n");
 307                         goto out;
 308                 }
 309                 for (i = 0; i < MAX_BOARD; i++) {
 310                         int serial;
 311                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
 312
 313                         if (!apbs[i].RamIO)
 314                                 continue;
 315
 316                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
 317                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
 318
 319                         boardname[serial] = 0;
 320
 321
 322                         printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
 323                                i+1, boardname,
 324                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
 325                                (int)(readb(apbs[i].RamIO + VERS) & 0xF));
 326
 327                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
 328                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
 329                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
 330
 331                         if (serial != 0)
 332                                 printk(" S/N %d\n", serial);
 333                         else
 334                                 printk("\n");
 335                 }
 336                 return 0;
 337         }
 338
 339         else
 340                 return -ENXIO;
 341
 342 out:
 343         for (i = 0; i < MAX_BOARD; i++) {
 344                 if (!apbs[i].RamIO)
 345                         continue;
 346                 if (apbs[i].irq)
 347                         free_irq(apbs[i].irq, &dummy);
 348                 iounmap(apbs[i].RamIO);
 349         }
 350         return ret;
 351 }
 352
 353 module_init(applicom_init);
 354 module_exit(applicom_exit);
 355
 356
 357 static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
 358 {
 359         unsigned int NumCard;   /* Board number 1 -> 8           */
 360         unsigned int IndexCard; /* Index board number 0 -> 7     */
 361         unsigned char TicCard;  /* Board TIC to send             */
 362         unsigned long flags;    /* Current priority              */
 363         struct st_ram_io st_loc;
 364         struct mailbox tmpmailbox;
 365 #ifdef DEBUG
 366         int c;
 367 #endif
 368         DECLARE_WAITQUEUE(wait, current);
 369
 370         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
 371                 static int warncount = 5;
 372                 if (warncount) {
 373                         printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
 374                                count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
 375                         warncount--;
 376                 }
 377                 return -EINVAL;
 378         }
 379
 380         if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io)))
 381                 return -EFAULT;
 382
 383         if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
 384                           sizeof(struct mailbox)))
 385                 return -EFAULT;
 386
 387         NumCard = st_loc.num_card;      /* board number to send          */
 388         TicCard = st_loc.tic_des_from_pc;       /* tic number to send            */
 389         IndexCard = NumCard - 1;
 390
 391         if (IndexCard >= MAX_BOARD)
 392                 return -EINVAL;
 393         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
 394
 395         if (!apbs[IndexCard].RamIO)
 396                 return -EINVAL;
 397
 398 #ifdef DEBUG
 399         printk("Write to applicom card #%d. struct st_ram_io follows:",
 400                IndexCard+1);
 401
 402                 for (c = 0; c < sizeof(struct st_ram_io);) {
 403
 404                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
 405
 406                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
 407                                 printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
 408                         }
 409                 }
 410
 411                 printk("\nstruct mailbox follows:");
 412
 413                 for (c = 0; c < sizeof(struct mailbox);) {
 414                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
 415
 416                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
 417                                 printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
 418                         }
 419                 }
 420
 421                 printk("\n");
 422 #endif
 423
 424         spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
 425
 426         /* Test octet ready correct */
 427         if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) {
 428                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
 429                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 430                 printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
 431                        IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
 432                 DeviceErrorCount++;
 433                 return -EIO;
 434         }
 435
 436         /* Place ourselves on the wait queue */
 437         set_current_state(TASK_INTERRUPTIBLE);
 438         add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
 439
 440         /* Check whether the card is ready for us */
 441         while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
 442                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
 443                 /* It's busy. Sleep. */
 444
 445                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 446                 schedule();
 447                 if (signal_pending(current)) {
 448                         remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
 449                                           &wait);
 450                         return -EINTR;
 451                 }
 452                 spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
 453                 set_current_state(TASK_INTERRUPTIBLE);
 454         }
 455
 456         /* We may not have actually slept */
 457         set_current_state(TASK_RUNNING);
 458         remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
 459
 460         writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 461
 462         /* Which is best - lock down the pages with rawio and then
 463            copy directly, or use bounce buffers? For now we do the latter
 464            because it works with 2.2 still */
 465         {
 466                 unsigned char *from = (unsigned char *) &tmpmailbox;
 467                 void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
 468                 int c;
 469
 470                 for (c = 0; c < sizeof(struct mailbox); c++)
 471                         writeb(*(from++), to++);
 472         }
 473
 474         writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
 475         writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
 476         writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
 477         writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
 478         writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 479         writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 480         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 481         spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
 482         return 0;
 483 }
 484
 485 static int do_ac_read(int IndexCard, char __user *buf,
 486                 struct st_ram_io *st_loc, struct mailbox *mailbox)
 487 {
 488         void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
 489         unsigned char *to = (unsigned char *)mailbox;
 490 #ifdef DEBUG
 491         int c;
 492 #endif
 493
 494         st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
 495         st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
 496
 497
 498         {
 499                 int c;
 500
 501                 for (c = 0; c < sizeof(struct mailbox); c++)
 502                         *(to++) = readb(from++);
 503         }
 504         writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
 505         writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
 506         writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
 507         writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC),
 508                apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
 509         writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
 510         writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
 511         writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 512         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 513
 514 #ifdef DEBUG
 515                 printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
 516
 517                 for (c = 0; c < sizeof(struct st_ram_io);) {
 518                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
 519
 520                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
 521                                 printk(" %2.2X", ((unsigned char *)st_loc)[c]);
 522                         }
 523                 }
 524
 525                 printk("\nstruct mailbox follows:");
 526
 527                 for (c = 0; c < sizeof(struct mailbox);) {
 528                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
 529
 530                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
 531                                 printk(" %2.2X", ((unsigned char *)mailbox)[c]);
 532                         }
 533                 }
 534                 printk("\n");
 535 #endif
 536         return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
 537 }
 538
 539 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
 540 {
 541         unsigned long flags;
 542         unsigned int i;
 543         unsigned char tmp;
 544         int ret = 0;
 545         DECLARE_WAITQUEUE(wait, current);
 546 #ifdef DEBUG
 547         int loopcount=0;
 548 #endif
 549         /* No need to ratelimit this. Only root can trigger it anyway */
 550         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
 551                 printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
 552                         count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
 553                 return -EINVAL;
 554         }
 555
 556         while(1) {
 557                 /* Stick ourself on the wait queue */
 558                 set_current_state(TASK_INTERRUPTIBLE);
 559                 add_wait_queue(&FlagSleepRec, &wait);
 560
 561                 /* Scan each board, looking for one which has a packet for us */
 562                 for (i=0; i < MAX_BOARD; i++) {
 563                         if (!apbs[i].RamIO)
 564                                 continue;
 565                         spin_lock_irqsave(&apbs[i].mutex, flags);
 566
 567                         tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
 568
 569                         if (tmp == 2) {
 570                                 struct st_ram_io st_loc;
 571                                 struct mailbox mailbox;
 572
 573                                 /* Got a packet for us */
 574                                 memset(&st_loc, 0, sizeof(st_loc));
 575                                 ret = do_ac_read(i, buf, &st_loc, &mailbox);
 576                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
 577                                 set_current_state(TASK_RUNNING);
 578                                 remove_wait_queue(&FlagSleepRec, &wait);
 579
 580                                 if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
 581                                         return -EFAULT;
 582                                 if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
 583                                         return -EFAULT;
 584                                 return tmp;
 585                         }
 586
 587                         if (tmp > 2) {
 588                                 /* Got an error */
 589                                 Dummy = readb(apbs[i].RamIO + VERS);
 590
 591                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
 592                                 set_current_state(TASK_RUNNING);
 593                                 remove_wait_queue(&FlagSleepRec, &wait);
 594
 595                                 printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
 596                                        i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
 597                                 DeviceErrorCount++;
 598                                 return -EIO;
 599                         }
 600
 601                         /* Nothing for us. Try the next board */
 602                         Dummy = readb(apbs[i].RamIO + VERS);
 603                         spin_unlock_irqrestore(&apbs[i].mutex, flags);
 604
 605                 } /* per board */
 606
 607                 /* OK - No boards had data for us. Sleep now */
 608
 609                 schedule();
 610                 remove_wait_queue(&FlagSleepRec, &wait);
 611
 612                 if (signal_pending(current))
 613                         return -EINTR;
 614
 615 #ifdef DEBUG
 616                 if (loopcount++ > 2) {
 617                         printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
 618                 }
 619 #endif
 620         }
 621 }
 622
 623 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
 624 {
 625         unsigned int i;
 626         unsigned int FlagInt;
 627         unsigned int LoopCount;
 628         int handled = 0;
 629
 630         //    printk("Applicom interrupt on IRQ %d occurred\n", vec);
 631
 632         LoopCount = 0;
 633
 634         do {
 635                 FlagInt = 0;
 636                 for (i = 0; i < MAX_BOARD; i++) {
 637
 638                         /* Skip if this board doesn't exist */
 639                         if (!apbs[i].RamIO)
 640                                 continue;
 641
 642                         spin_lock(&apbs[i].mutex);
 643
 644                         /* Skip if this board doesn't want attention */
 645                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
 646                                 spin_unlock(&apbs[i].mutex);
 647                                 continue;
 648                         }
 649
 650                         handled = 1;
 651                         FlagInt = 1;
 652                         writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
 653
 654                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
 655                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
 656                                        i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
 657                                 DeviceErrorCount++;
 658                         }
 659
 660                         if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) &&
 661                            (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
 662
 663                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
 664                                        i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
 665                                 DeviceErrorCount++;
 666                         }
 667
 668                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {     /* mailbox sent by the card ?   */
 669                                 if (waitqueue_active(&FlagSleepRec)) {
 670                                 wake_up_interruptible(&FlagSleepRec);
 671                         }
 672                         }
 673
 674                         if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {   /* ram i/o free for write by pc ? */
 675                                 if (waitqueue_active(&apbs[i].FlagSleepSend)) { /* process sleep during read ?    */
 676                                         wake_up_interruptible(&apbs[i].FlagSleepSend);
 677                                 }
 678                         }
 679                         Dummy = readb(apbs[i].RamIO + VERS);
 680
 681                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
 682                                 /* There's another int waiting on this card */
 683                                 spin_unlock(&apbs[i].mutex);
 684                                 i--;
 685                         } else {
 686                                 spin_unlock(&apbs[i].mutex);
 687                         }
 688                 }
 689                 if (FlagInt)
 690                         LoopCount = 0;
 691                 else
 692                         LoopCount++;
 693         } while(LoopCount < 2);
 694         return IRQ_RETVAL(handled);
 695 }
 696
 697
 698
 699 static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 700
 701 {                               /* @ ADG ou ATO selon le cas */
 702         int i;
 703         unsigned char IndexCard;
 704         void __iomem *pmem;
 705         int ret = 0;
 706         static int warncount = 10;
 707         volatile unsigned char byte_reset_it;
 708         struct st_ram_io *adgl;
 709         void __user *argp = (void __user *)arg;
 710
 711         /* In general, the device is only openable by root anyway, so we're not
 712            particularly concerned that bogus ioctls can flood the console. */
 713
 714         adgl = memdup_user(argp, sizeof(struct st_ram_io));
 715         if (IS_ERR(adgl))
 716                 return PTR_ERR(adgl);
 717
 718         mutex_lock(&ac_mutex);
 719         IndexCard = adgl->num_card-1;
 720
 721         if (cmd != 6 && IndexCard >= MAX_BOARD)
 722                 goto err;
 723         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
 724
 725         if (cmd != 6 && !apbs[IndexCard].RamIO)
 726                 goto err;
 727
 728         switch (cmd) {
 729
 730         case 0:
 731                 pmem = apbs[IndexCard].RamIO;
 732                 for (i = 0; i < sizeof(struct st_ram_io); i++)
 733                         ((unsigned char *)adgl)[i]=readb(pmem++);
 734                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
 735                         ret = -EFAULT;
 736                 break;
 737         case 1:
 738                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
 739                 for (i = 0; i < 4; i++)
 740                         adgl->conf_end_test[i] = readb(pmem++);
 741                 for (i = 0; i < 2; i++)
 742                         adgl->error_code[i] = readb(pmem++);
 743                 for (i = 0; i < 4; i++)
 744                         adgl->parameter_error[i] = readb(pmem++);
 745                 pmem = apbs[IndexCard].RamIO + VERS;
 746                 adgl->vers = readb(pmem);
 747                 pmem = apbs[IndexCard].RamIO + TYPE_CARD;
 748                 for (i = 0; i < 20; i++)
 749                         adgl->reserv1[i] = readb(pmem++);
 750                 *(int *)&adgl->reserv1[20] =
 751                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) +
 752                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) +
 753                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );
 754
 755                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
 756                         ret = -EFAULT;
 757                 break;
 758         case 2:
 759                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
 760                 for (i = 0; i < 10; i++)
 761                         writeb(0xff, pmem++);
 762                 writeb(adgl->data_from_pc_ready,
 763                        apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 764
 765                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 766
 767                 for (i = 0; i < MAX_BOARD; i++) {
 768                         if (apbs[i].RamIO) {
 769                                 byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
 770                         }
 771                 }
 772                 break;
 773         case 3:
 774                 pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
 775                 writeb(adgl->tic_des_from_pc, pmem);
 776                 break;
 777         case 4:
 778                 pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
 779                 adgl->tic_owner_to_pc     = readb(pmem++);
 780                 adgl->numcard_owner_to_pc = readb(pmem);
 781                 if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
 782                         ret = -EFAULT;
 783                 break;
 784         case 5:
 785                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
 786                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
 787                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
 788                 writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
 789                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
 790                 break;
 791         case 6:
 792                 printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)\n");
 793                 printk(KERN_INFO "Number of installed boards . %d\n", (int) numboards);
 794                 printk(KERN_INFO "Segment of board ........... %X\n", (int) mem);
 795                 printk(KERN_INFO "Interrupt IRQ number ....... %d\n", (int) irq);
 796                 for (i = 0; i < MAX_BOARD; i++) {
 797                         int serial;
 798                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
 799
 800                         if (!apbs[i].RamIO)
 801                                 continue;
 802
 803                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
 804                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
 805                         boardname[serial] = 0;
 806
 807                         printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
 808                                i+1,
 809                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
 810                                (int)(readb(apbs[i].RamIO + VERS) & 0xF),
 811                                boardname);
 812
 813
 814                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
 815                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
 816                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
 817
 818                         if (serial != 0)
 819                                 printk(" S/N %d\n", serial);
 820                         else
 821                                 printk("\n");
 822                 }
 823                 if (DeviceErrorCount != 0)
 824                         printk(KERN_INFO "DeviceErrorCount ........... %d\n", DeviceErrorCount);
 825                 if (ReadErrorCount != 0)
 826                         printk(KERN_INFO "ReadErrorCount ............. %d\n", ReadErrorCount);
 827                 if (WriteErrorCount != 0)
 828                         printk(KERN_INFO "WriteErrorCount ............ %d\n", WriteErrorCount);
 829                 if (waitqueue_active(&FlagSleepRec))
 830                         printk(KERN_INFO "Process in read pending\n");
 831                 for (i = 0; i < MAX_BOARD; i++) {
 832                         if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
 833                                 printk(KERN_INFO "Process in write pending board %d\n",i+1);
 834                 }
 835                 break;
 836         default:
 837                 ret = -ENOTTY;
 838                 break;
 839         }
 840         Dummy = readb(apbs[IndexCard].RamIO + VERS);
 841         kfree(adgl);
 842         mutex_unlock(&ac_mutex);
 843         return 0;
 844
 845 err:
 846         if (warncount) {
 847                 pr_warn("APPLICOM driver IOCTL, bad board number %d\n",
 848                         (int)IndexCard + 1);
 849                 warncount--;
 850         }
 851         kfree(adgl);
 852         mutex_unlock(&ac_mutex);
 853         return -EINVAL;
 854
 855 }
 856