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/* 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;