applicom.c

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/* Derived from Applicom driver ac.c for SCO Unix                            */
/* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
/* [email protected] 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       */
/* addresses 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/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/mutex.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

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

static struct pci_device_id applicom_pci_tbl[] = {
    { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
    { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
    { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },
    { 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_ALIAS_MISCDEV(AC_MINOR);

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 long ac_ioctl(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,
    .unlocked_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 (!pci_match_id(applicom_pci_tbl, dev))
            continue;
        
        if (pci_enable_device(dev))
            return -EIO;

        RamIO = ioremap_nocache(pci_resource_start(dev, 0), LEN_RAM_IO);

        if (!RamIO) {
            printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
                "space at 0x%llx\n",
                (unsigned long long)pci_resource_start(dev, 0));
            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)pci_resource_start(dev, 0),
               dev->irq);

        boardno = ac_register_board(pci_resource_start(dev, 0),
                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_nocache(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 */
                memset(&st_loc, 0, sizeof(st_loc));
                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 long ac_ioctl(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 = memdup_user(argp, sizeof(struct st_ram_io));
    if (IS_ERR(adgl))
        return PTR_ERR(adgl);

    mutex_lock(&ac_mutex);  
    IndexCard = adgl->num_card-1;
     
    if(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);
        mutex_unlock(&ac_mutex);
        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:
        ret = -ENOTTY;
        break;
    }
    Dummy = readb(apbs[IndexCard].RamIO + VERS);
    kfree(adgl);
    mutex_unlock(&ac_mutex);
    return 0;
}