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applicom.c

/* Derived from Applicom driver ac.c for SCO Unix                            */
/* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
/* dwmw2@infradead.org 30/8/98                                               */
/* $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $                    */
/* This module is for Linux 2.1 and 2.2 series kernels.                      */
/*****************************************************************************/
/* J PAGET 18/02/94 passage V2.4.2 ioctl avec code 2 reset to les interrupt  */
/* ceci pour reseter correctement apres une sortie sauvage                   */
/* J PAGET 02/05/94 passage V2.4.3 dans le traitement de d'interruption,     */
/* LoopCount n'etait pas initialise a 0.                                     */
/* F LAFORSE 04/07/95 version V2.6.0 lecture bidon apres acces a une carte   */
/*           pour liberer le bus                                             */
/* J.PAGET 19/11/95 version V2.6.1 Nombre, addresse,irq n'est plus configure */
/* et passe en argument a acinit, mais est scrute sur le bus pour s'adapter  */
/* au nombre de cartes presentes sur le bus. IOCL code 6 affichait V2.4.3    */
/* F.LAFORSE 28/11/95 creation de fichiers acXX.o avec les differentes       */
/* adresses de base des cartes, IOCTL 6 plus complet                         */
/* J.PAGET le 19/08/96 copie de la version V2.6 en V2.8.0 sans modification  */
/* de code autre que le texte V2.6.1 en V2.8.0                               */
/*****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/init.h>
#include <linux/fs.h>

#include <asm/io.h>
#include <asm/uaccess.h>

#include "applicom.h"


/* NOTE: We use for loops with {write,read}b() instead of 
   memcpy_{from,to}io throughout this driver. This is because
   the board doesn't correctly handle word accesses - only
   bytes. 
*/


#undef DEBUG

#define MAX_BOARD 8           /* maximum of pc board possible */
#define MAX_ISA_BOARD 4
#define LEN_RAM_IO 0x800
#define AC_MINOR 157

#ifndef PCI_VENDOR_ID_APPLICOM
#define PCI_VENDOR_ID_APPLICOM                0x1389
#define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
#define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
#define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
#endif
#define MAX_PCI_DEVICE_NUM 3

static char *applicom_pci_devnames[] = {
      "PCI board",
      "PCI2000IBS / PCI2000CAN",
      "PCI2000PFB"
};

static struct pci_device_id applicom_pci_tbl[] = {
      { PCI_VENDOR_ID_APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC,
        PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
      { PCI_VENDOR_ID_APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN,
        PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
      { PCI_VENDOR_ID_APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB,
        PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
      { 0 }
};
MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);

MODULE_AUTHOR("David Woodhouse & Applicom International");
MODULE_DESCRIPTION("Driver for Applicom Profibus card");
MODULE_LICENSE("GPL");

MODULE_SUPPORTED_DEVICE("ac");


static struct applicom_board {
      unsigned long PhysIO;
      void __iomem *RamIO;
      wait_queue_head_t FlagSleepSend;
      long irq;
      spinlock_t mutex;
} apbs[MAX_BOARD];

static unsigned int irq = 0;  /* interrupt number IRQ       */
static unsigned long mem = 0; /* physical segment of board  */

module_param(irq, uint, 0);
MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
module_param(mem, ulong, 0);
MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");

static unsigned int numboards;      /* number of installed boards */
static volatile unsigned char Dummy;
static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
static unsigned int WriteErrorCount;      /* number of write error      */
static unsigned int ReadErrorCount; /* number of read error       */
static unsigned int DeviceErrorCount;     /* number of device error     */

static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
static int ac_ioctl(struct inode *, struct file *, unsigned int,
                unsigned long);
static irqreturn_t ac_interrupt(int, void *);

static const struct file_operations ac_fops = {
      .owner = THIS_MODULE,
      .llseek = no_llseek,
      .read = ac_read,
      .write = ac_write,
      .ioctl = ac_ioctl,
};

static struct miscdevice ac_miscdev = {
      AC_MINOR,
      "ac",
      &ac_fops
};

static int dummy; /* dev_id for request_irq() */

static int ac_register_board(unsigned long physloc, void __iomem *loc, 
                  unsigned char boardno)
{
      volatile unsigned char byte_reset_it;

      if((readb(loc + CONF_END_TEST)     != 0x00) ||
         (readb(loc + CONF_END_TEST + 1) != 0x55) ||
         (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
         (readb(loc + CONF_END_TEST + 3) != 0xFF))
            return 0;

      if (!boardno)
            boardno = readb(loc + NUMCARD_OWNER_TO_PC);

      if (!boardno || boardno > MAX_BOARD) {
            printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
                   boardno, physloc, MAX_BOARD);
            return 0;
      }

      if (apbs[boardno - 1].RamIO) {
            printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n", 
                   boardno, physloc, boardno, apbs[boardno-1].PhysIO);
            return 0;
      }

      boardno--;

      apbs[boardno].PhysIO = physloc;
      apbs[boardno].RamIO = loc;
      init_waitqueue_head(&apbs[boardno].FlagSleepSend);
      spin_lock_init(&apbs[boardno].mutex);
      byte_reset_it = readb(loc + RAM_IT_TO_PC);

      numboards++;
      return boardno + 1;
}

static void __exit applicom_exit(void)
{
      unsigned int i;

      misc_deregister(&ac_miscdev);

      for (i = 0; i < MAX_BOARD; i++) {

            if (!apbs[i].RamIO)
                  continue;

            if (apbs[i].irq)
                  free_irq(apbs[i].irq, &dummy);

            iounmap(apbs[i].RamIO);
      }
}

static int __init applicom_init(void)
{
      int i, numisa = 0;
      struct pci_dev *dev = NULL;
      void __iomem *RamIO;
      int boardno, ret;

      printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");

      /* No mem and irq given - check for a PCI card */

      while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {

            if (dev->vendor != PCI_VENDOR_ID_APPLICOM)
                  continue;
            
            if (dev->device  > MAX_PCI_DEVICE_NUM || dev->device == 0)
                  continue;
            
            if (pci_enable_device(dev))
                  return -EIO;

            RamIO = ioremap(dev->resource[0].start, LEN_RAM_IO);

            if (!RamIO) {
                  printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
                        "space at 0x%llx\n",
                        (unsigned long long)dev->resource[0].start);
                  pci_disable_device(dev);
                  return -EIO;
            }

            printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
                   applicom_pci_devnames[dev->device-1],
                     (unsigned long long)dev->resource[0].start,
                   dev->irq);

            boardno = ac_register_board(dev->resource[0].start, RamIO,0);
            if (!boardno) {
                  printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
                  iounmap(RamIO);
                  pci_disable_device(dev);
                  continue;
            }

            if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
                  printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
                  iounmap(RamIO);
                  pci_disable_device(dev);
                  apbs[boardno - 1].RamIO = NULL;
                  continue;
            }

            /* Enable interrupts. */

            writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);

            apbs[boardno - 1].irq = dev->irq;
      }

      /* Finished with PCI cards. If none registered, 
       * and there was no mem/irq specified, exit */

      if (!mem || !irq) {
            if (numboards)
                  goto fin;
            else {
                  printk(KERN_INFO "ac.o: No PCI boards found.\n");
                  printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
                  return -ENXIO;
            }
      }

      /* Now try the specified ISA cards */

      for (i = 0; i < MAX_ISA_BOARD; i++) {
            RamIO = ioremap(mem + (LEN_RAM_IO * i), LEN_RAM_IO);

            if (!RamIO) {
                  printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
                  continue;
            }

            if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
                                      RamIO,i+1))) {
                  iounmap(RamIO);
                  continue;
            }

            printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);

            if (!numisa) {
                  if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
                        printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
                        iounmap(RamIO);
                        apbs[boardno - 1].RamIO = NULL;
                  }
                  else
                        apbs[boardno - 1].irq = irq;
            }
            else
                  apbs[boardno - 1].irq = 0;

            numisa++;
      }

      if (!numisa)
            printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
                        "at mem 0x%lx\n", mem);

 fin:
      init_waitqueue_head(&FlagSleepRec);

      WriteErrorCount = 0;
      ReadErrorCount = 0;
      DeviceErrorCount = 0;

      if (numboards) {
            ret = misc_register(&ac_miscdev);
            if (ret) {
                  printk(KERN_WARNING "ac.o: Unable to register misc device\n");
                  goto out;
            }
            for (i = 0; i < MAX_BOARD; i++) {
                  int serial;
                  char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];

                  if (!apbs[i].RamIO)
                        continue;

                  for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
                        boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);

                  boardname[serial] = 0;


                  printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
                         i+1, boardname,
                         (int)(readb(apbs[i].RamIO + VERS) >> 4),
                         (int)(readb(apbs[i].RamIO + VERS) & 0xF));
                  
                  serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
                        (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
                        (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );

                  if (serial != 0)
                        printk(" S/N %d\n", serial);
                  else
                        printk("\n");
            }
            return 0;
      }

      else
            return -ENXIO;

out:
      for (i = 0; i < MAX_BOARD; i++) {
            if (!apbs[i].RamIO)
                  continue;
            if (apbs[i].irq)
                  free_irq(apbs[i].irq, &dummy);
            iounmap(apbs[i].RamIO);
      }
      pci_disable_device(dev);
      return ret;
}

module_init(applicom_init);
module_exit(applicom_exit);


static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
{
      unsigned int NumCard;   /* Board number 1 -> 8           */
      unsigned int IndexCard; /* Index board number 0 -> 7     */
      unsigned char TicCard;  /* Board TIC to send             */
      unsigned long flags;    /* Current priority              */
      struct st_ram_io st_loc;
      struct mailbox tmpmailbox;
#ifdef DEBUG
      int c;
#endif
      DECLARE_WAITQUEUE(wait, current);

      if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
            static int warncount = 5;
            if (warncount) {
                  printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
                         count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
                  warncount--;
            }
            return -EINVAL;
      }

      if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io))) 
            return -EFAULT;
      
      if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
                    sizeof(struct mailbox))) 
            return -EFAULT;

      NumCard = st_loc.num_card;    /* board number to send          */
      TicCard = st_loc.tic_des_from_pc;   /* tic number to send            */
      IndexCard = NumCard - 1;

      if((NumCard < 1) || (NumCard > MAX_BOARD) || !apbs[IndexCard].RamIO)
            return -EINVAL;

#ifdef DEBUG
      printk("Write to applicom card #%d. struct st_ram_io follows:",
             IndexCard+1);

            for (c = 0; c < sizeof(struct st_ram_io);) {
            
                  printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);

                  for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
                        printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
                  }
            }

            printk("\nstruct mailbox follows:");

            for (c = 0; c < sizeof(struct mailbox);) {
                  printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);

                  for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
                        printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
                  }
            }

            printk("\n");
#endif

      spin_lock_irqsave(&apbs[IndexCard].mutex, flags);

      /* Test octet ready correct */
      if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) { 
            Dummy = readb(apbs[IndexCard].RamIO + VERS);
            spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
            printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
                   IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
            DeviceErrorCount++;
            return -EIO;
      }
      
      /* Place ourselves on the wait queue */
      set_current_state(TASK_INTERRUPTIBLE);
      add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);

      /* Check whether the card is ready for us */
      while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
            Dummy = readb(apbs[IndexCard].RamIO + VERS);
            /* It's busy. Sleep. */

            spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
            schedule();
            if (signal_pending(current)) {
                  remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
                                &wait);
                  return -EINTR;
            }
            spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
            set_current_state(TASK_INTERRUPTIBLE);
      }

      /* We may not have actually slept */
      set_current_state(TASK_RUNNING);
      remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);

      writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);

      /* Which is best - lock down the pages with rawio and then
         copy directly, or use bounce buffers? For now we do the latter 
         because it works with 2.2 still */
      {
            unsigned char *from = (unsigned char *) &tmpmailbox;
            void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
            int c;

            for (c = 0; c < sizeof(struct mailbox); c++)
                  writeb(*(from++), to++);
      }

      writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
      writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
      writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
      writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
      writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
      writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
      Dummy = readb(apbs[IndexCard].RamIO + VERS);
      spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
      return 0;
}

static int do_ac_read(int IndexCard, char __user *buf,
            struct st_ram_io *st_loc, struct mailbox *mailbox)
{
      void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
      unsigned char *to = (unsigned char *)&mailbox;
#ifdef DEBUG
      int c;
#endif

      st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
      st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);


      {
            int c;

            for (c = 0; c < sizeof(struct mailbox); c++)
                  *(to++) = readb(from++);
      }
      writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
      writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
      writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
      writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC), 
             apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
      writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
      writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
      writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
      Dummy = readb(apbs[IndexCard].RamIO + VERS);

#ifdef DEBUG
            printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);

            for (c = 0; c < sizeof(struct st_ram_io);) {
                  printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);

                  for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
                        printk(" %2.2X", ((unsigned char *)st_loc)[c]);
                  }
            }

            printk("\nstruct mailbox follows:");

            for (c = 0; c < sizeof(struct mailbox);) {
                  printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);

                  for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
                        printk(" %2.2X", ((unsigned char *)mailbox)[c]);
                  }
            }
            printk("\n");
#endif
      return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
}

static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
{
      unsigned long flags;
      unsigned int i;
      unsigned char tmp;
      int ret = 0;
      DECLARE_WAITQUEUE(wait, current);
#ifdef DEBUG
      int loopcount=0;
#endif
      /* No need to ratelimit this. Only root can trigger it anyway */
      if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
            printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
                  count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
            return -EINVAL;
      }
      
      while(1) {
            /* Stick ourself on the wait queue */
            set_current_state(TASK_INTERRUPTIBLE);
            add_wait_queue(&FlagSleepRec, &wait);
            
            /* Scan each board, looking for one which has a packet for us */
            for (i=0; i < MAX_BOARD; i++) {
                  if (!apbs[i].RamIO)
                        continue;
                  spin_lock_irqsave(&apbs[i].mutex, flags);
                  
                  tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
                  
                  if (tmp == 2) {
                        struct st_ram_io st_loc;
                        struct mailbox mailbox;

                        /* Got a packet for us */
                        ret = do_ac_read(i, buf, &st_loc, &mailbox);
                        spin_unlock_irqrestore(&apbs[i].mutex, flags);
                        set_current_state(TASK_RUNNING);
                        remove_wait_queue(&FlagSleepRec, &wait);

                        if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
                              return -EFAULT;
                        if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
                              return -EFAULT;
                        return tmp;
                  }
                  
                  if (tmp > 2) {
                        /* Got an error */
                        Dummy = readb(apbs[i].RamIO + VERS);
                        
                        spin_unlock_irqrestore(&apbs[i].mutex, flags);
                        set_current_state(TASK_RUNNING);
                        remove_wait_queue(&FlagSleepRec, &wait);
                        
                        printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
                               i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
                        DeviceErrorCount++;
                        return -EIO;
                  }
                  
                  /* Nothing for us. Try the next board */
                  Dummy = readb(apbs[i].RamIO + VERS);
                  spin_unlock_irqrestore(&apbs[i].mutex, flags);
                  
            } /* per board */

            /* OK - No boards had data for us. Sleep now */

            schedule();
            remove_wait_queue(&FlagSleepRec, &wait);

            if (signal_pending(current))
                  return -EINTR;

#ifdef DEBUG
            if (loopcount++ > 2) {
                  printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
            }
#endif
      } 
}

static irqreturn_t ac_interrupt(int vec, void *dev_instance)
{
      unsigned int i;
      unsigned int FlagInt;
      unsigned int LoopCount;
      int handled = 0;

      //    printk("Applicom interrupt on IRQ %d occurred\n", vec);

      LoopCount = 0;

      do {
            FlagInt = 0;
            for (i = 0; i < MAX_BOARD; i++) {
                  
                  /* Skip if this board doesn't exist */
                  if (!apbs[i].RamIO)
                        continue;

                  spin_lock(&apbs[i].mutex);

                  /* Skip if this board doesn't want attention */
                  if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
                        spin_unlock(&apbs[i].mutex);
                        continue;
                  }

                  handled = 1;
                  FlagInt = 1;
                  writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);

                  if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
                        printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
                               i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
                        DeviceErrorCount++;
                  }

                  if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) && 
                     (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
                        
                        printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
                               i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
                        DeviceErrorCount++;
                  }

                  if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {   /* mailbox sent by the card ?   */
                        if (waitqueue_active(&FlagSleepRec)) {
                        wake_up_interruptible(&FlagSleepRec);
                  }
                  }

                  if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) { /* ram i/o free for write by pc ? */
                        if (waitqueue_active(&apbs[i].FlagSleepSend)) { /* process sleep during read ?    */
                              wake_up_interruptible(&apbs[i].FlagSleepSend);
                        }
                  }
                  Dummy = readb(apbs[i].RamIO + VERS);

                  if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
                        /* There's another int waiting on this card */
                        spin_unlock(&apbs[i].mutex);
                        i--;
                  } else {
                        spin_unlock(&apbs[i].mutex);
                  }
            }
            if (FlagInt)
                  LoopCount = 0;
            else
                  LoopCount++;
      } while(LoopCount < 2);
      return IRQ_RETVAL(handled);
}



static int ac_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
     
{                       /* @ ADG ou ATO selon le cas */
      int i;
      unsigned char IndexCard;
      void __iomem *pmem;
      int ret = 0;
      volatile unsigned char byte_reset_it;
      struct st_ram_io *adgl;
      void __user *argp = (void __user *)arg;

      /* In general, the device is only openable by root anyway, so we're not
         particularly concerned that bogus ioctls can flood the console. */

      adgl = kmalloc(sizeof(struct st_ram_io), GFP_KERNEL);
      if (!adgl)
            return -ENOMEM;

      if (copy_from_user(adgl, argp, sizeof(struct st_ram_io))) {
            kfree(adgl);
            return -EFAULT;
      }
      
      IndexCard = adgl->num_card-1;
       
      if(cmd != 0 && cmd != 6 &&
         ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) {
            static int warncount = 10;
            if (warncount) {
                  printk( KERN_WARNING "APPLICOM driver IOCTL, bad board number %d\n",(int)IndexCard+1);
                  warncount--;
            }
            kfree(adgl);
            return -EINVAL;
      }

      switch (cmd) {
            
      case 0:
            pmem = apbs[IndexCard].RamIO;
            for (i = 0; i < sizeof(struct st_ram_io); i++)
                  ((unsigned char *)adgl)[i]=readb(pmem++);
            if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
                  ret = -EFAULT;
            break;
      case 1:
            pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
            for (i = 0; i < 4; i++)
                  adgl->conf_end_test[i] = readb(pmem++);
            for (i = 0; i < 2; i++)
                  adgl->error_code[i] = readb(pmem++);
            for (i = 0; i < 4; i++)
                  adgl->parameter_error[i] = readb(pmem++);
            pmem = apbs[IndexCard].RamIO + VERS;
            adgl->vers = readb(pmem);
            pmem = apbs[IndexCard].RamIO + TYPE_CARD;
            for (i = 0; i < 20; i++)
                  adgl->reserv1[i] = readb(pmem++);
            *(int *)&adgl->reserv1[20] =  
                  (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) + 
                  (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) + 
                  (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );

            if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
                  ret = -EFAULT;
            break;
      case 2:
            pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
            for (i = 0; i < 10; i++)
                  writeb(0xff, pmem++);
            writeb(adgl->data_from_pc_ready, 
                   apbs[IndexCard].RamIO + DATA_FROM_PC_READY);

            writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
            
            for (i = 0; i < MAX_BOARD; i++) {
                  if (apbs[i].RamIO) {
                        byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
                  }
            }
            break;
      case 3:
            pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
            writeb(adgl->tic_des_from_pc, pmem);
            break;
      case 4:
            pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
            adgl->tic_owner_to_pc     = readb(pmem++);
            adgl->numcard_owner_to_pc = readb(pmem);
            if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
                  ret = -EFAULT;
            break;
      case 5:
            writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
            writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
            writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
            writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
            writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
            break;
      case 6:
            printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)\n");
            printk(KERN_INFO "Number of installed boards . %d\n", (int) numboards);
            printk(KERN_INFO "Segment of board ........... %X\n", (int) mem);
            printk(KERN_INFO "Interrupt IRQ number ....... %d\n", (int) irq);
            for (i = 0; i < MAX_BOARD; i++) {
                  int serial;
                  char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];

                  if (!apbs[i].RamIO)
                        continue;

                  for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
                        boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
                  boardname[serial] = 0;

                  printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
                         i+1,
                         (int)(readb(apbs[IndexCard].RamIO + VERS) >> 4),
                         (int)(readb(apbs[IndexCard].RamIO + VERS) & 0xF),
                         boardname);


                  serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
                        (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
                        (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );

                  if (serial != 0)
                        printk(" S/N %d\n", serial);
                  else
                        printk("\n");
            }
            if (DeviceErrorCount != 0)
                  printk(KERN_INFO "DeviceErrorCount ........... %d\n", DeviceErrorCount);
            if (ReadErrorCount != 0)
                  printk(KERN_INFO "ReadErrorCount ............. %d\n", ReadErrorCount);
            if (WriteErrorCount != 0)
                  printk(KERN_INFO "WriteErrorCount ............ %d\n", WriteErrorCount);
            if (waitqueue_active(&FlagSleepRec))
                  printk(KERN_INFO "Process in read pending\n");
            for (i = 0; i < MAX_BOARD; i++) {
                  if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
                        printk(KERN_INFO "Process in write pending board %d\n",i+1);
            }
            break;
      default:
            printk(KERN_INFO "APPLICOM driver ioctl, unknown function code %d\n",cmd) ;
            ret = -EINVAL;
            break;
      }
      Dummy = readb(apbs[IndexCard].RamIO + VERS);
      kfree(adgl);
      return 0;
}


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