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cosa.c

/* $Id: cosa.c,v 1.31 2000/03/08 17:47:16 kas Exp $ */

/*
 *  Copyright (C) 1995-1997  Jan "Yenya" Kasprzak <kas@fi.muni.cz>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * The driver for the SRP and COSA synchronous serial cards.
 *
 * HARDWARE INFO
 *
 * Both cards are developed at the Institute of Computer Science,
 * Masaryk University (http://www.ics.muni.cz/). The hardware is
 * developed by Jiri Novotny <novotny@ics.muni.cz>. More information
 * and the photo of both cards is available at
 * http://www.pavoucek.cz/cosa.html. The card documentation, firmwares
 * and other goods can be downloaded from ftp://ftp.ics.muni.cz/pub/cosa/.
 * For Linux-specific utilities, see below in the "Software info" section.
 * If you want to order the card, contact Jiri Novotny.
 *
 * The SRP (serial port?, the Czech word "srp" means "sickle") card
 * is a 2-port intelligent (with its own 8-bit CPU) synchronous serial card
 * with V.24 interfaces up to 80kb/s each.
 *
 * The COSA (communication serial adapter?, the Czech word "kosa" means
 * "scythe") is a next-generation sync/async board with two interfaces
 * - currently any of V.24, X.21, V.35 and V.36 can be selected.
 * It has a 16-bit SAB80166 CPU and can do up to 10 Mb/s per channel.
 * The 8-channels version is in development.
 *
 * Both types have downloadable firmware and communicate via ISA DMA.
 * COSA can be also a bus-mastering device.
 *
 * SOFTWARE INFO
 *
 * The homepage of the Linux driver is at http://www.fi.muni.cz/~kas/cosa/.
 * The CVS tree of Linux driver can be viewed there, as well as the
 * firmware binaries and user-space utilities for downloading the firmware
 * into the card and setting up the card.
 *
 * The Linux driver (unlike the present *BSD drivers :-) can work even
 * for the COSA and SRP in one computer and allows each channel to work
 * in one of the three modes (character device, Cisco HDLC, Sync PPP).
 *
 * AUTHOR
 *
 * The Linux driver was written by Jan "Yenya" Kasprzak <kas@fi.muni.cz>.
 *
 * You can mail me bugfixes and even success reports. I am especially
 * interested in the SMP and/or muliti-channel success/failure reports
 * (I wonder if I did the locking properly :-).
 *
 * THE AUTHOR USED THE FOLLOWING SOURCES WHEN PROGRAMMING THE DRIVER
 *
 * The COSA/SRP NetBSD driver by Zdenek Salvet and Ivos Cernohlavek
 * The skeleton.c by Donald Becker
 * The SDL Riscom/N2 driver by Mike Natale
 * The Comtrol Hostess SV11 driver by Alan Cox
 * The Sync PPP/Cisco HDLC layer (syncppp.c) ported to Linux by Alan Cox
 */
/*
 *     5/25/1999 : Marcelo Tosatti <marcelo@conectiva.com.br>
 *             fixed a deadlock in cosa_sppp_open
 */

/* ---------- Headers, macros, data structures ---------- */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/device.h>

#undef COSA_SLOW_IO     /* for testing purposes only */

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>

#include <net/syncppp.h>
#include "cosa.h"

/* Maximum length of the identification string. */
#define COSA_MAX_ID_STRING    128

/* Maximum length of the channel name */
#define COSA_MAX_NAME         (sizeof("cosaXXXcXXX")+1)

/* Per-channel data structure */

struct channel_data {
      void *if_ptr;     /* General purpose pointer (used by SPPP) */
      int usage;  /* Usage count; >0 for chrdev, -1 for netdev */
      int num;    /* Number of the channel */
      struct cosa_data *cosa; /* Pointer to the per-card structure */
      int txsize; /* Size of transmitted data */
      char *txbuf;      /* Transmit buffer */
      char name[COSA_MAX_NAME];     /* channel name */

      /* The HW layer interface */
      /* routine called from the RX interrupt */
      char *(*setup_rx)(struct channel_data *channel, int size);
      /* routine called when the RX is done (from the EOT interrupt) */
      int (*rx_done)(struct channel_data *channel);
      /* routine called when the TX is done (from the EOT interrupt) */
      int (*tx_done)(struct channel_data *channel, int size);

      /* Character device parts */
      struct semaphore rsem, wsem;
      char *rxdata;
      int rxsize;
      wait_queue_head_t txwaitq, rxwaitq;
      int tx_status, rx_status;

      /* SPPP/HDLC device parts */
      struct ppp_device pppdev;
      struct sk_buff *rx_skb, *tx_skb;
      struct net_device_stats stats;
};

/* cosa->firmware_status bits */
#define COSA_FW_RESET         (1<<0)      /* Is the ROM monitor active? */
#define COSA_FW_DOWNLOAD      (1<<1)      /* Is the microcode downloaded? */
#define COSA_FW_START         (1<<2)      /* Is the microcode running? */

struct cosa_data {
      int num;                /* Card number */
      char name[COSA_MAX_NAME];     /* Card name - e.g "cosa0" */
      unsigned int datareg, statusreg;    /* I/O ports */
      unsigned short irq, dma;      /* IRQ and DMA number */
      unsigned short startaddr;     /* Firmware start address */
      unsigned short busmaster;     /* Use busmastering? */
      int nchannels;                /* # of channels on this card */
      int driver_status;            /* For communicating with firmware */
      int firmware_status;          /* Downloaded, reseted, etc. */
      unsigned long rxbitmap, txbitmap;/* Bitmap of channels who are willing to send/receive data */
      unsigned long rxtx;           /* RX or TX in progress? */
      int enabled;
      int usage;                    /* usage count */
      int txchan, txsize, rxsize;
      struct channel_data *rxchan;
      char *bouncebuf;
      char *txbuf, *rxbuf;
      struct channel_data *chan;
      spinlock_t lock;  /* For exclusive operations on this structure */
      char id_string[COSA_MAX_ID_STRING]; /* ROM monitor ID string */
      char *type;                   /* card type */
};

/*
 * Define this if you want all the possible ports to be autoprobed.
 * It is here but it probably is not a good idea to use this.
 */
/* #define COSA_ISA_AUTOPROBE 1 */

/*
 * Character device major number. 117 was allocated for us.
 * The value of 0 means to allocate a first free one.
 */
static int cosa_major = 117;

/*
 * Encoding of the minor numbers:
 * The lowest CARD_MINOR_BITS bits means the channel on the single card,
 * the highest bits means the card number.
 */
#define CARD_MINOR_BITS 4     /* How many bits in minor number are reserved
                         * for the single card */
/*
 * The following depends on CARD_MINOR_BITS. Unfortunately, the "MODULE_STRING"
 * macro doesn't like anything other than the raw number as an argument :-(
 */
#define MAX_CARDS 16
/* #define MAX_CARDS    (1 << (8-CARD_MINOR_BITS)) */

#define DRIVER_RX_READY       0x0001
#define DRIVER_TX_READY       0x0002
#define DRIVER_TXMAP_SHIFT    2
#define DRIVER_TXMAP_MASK     0x0c  /* FIXME: 0xfc for 8-channel version */

/*
 * for cosa->rxtx - indicates whether either transmit or receive is
 * in progress. These values are mean number of the bit.
 */
#define TXBIT 0
#define RXBIT 1
#define IRQBIT 2

#define COSA_MTU 2000   /* FIXME: I don't know this exactly */

#undef DEBUG_DATA //1   /* Dump the data read or written to the channel */
#undef DEBUG_IRQS //1   /* Print the message when the IRQ is received */
#undef DEBUG_IO   //1   /* Dump the I/O traffic */

#define TX_TIMEOUT      (5*HZ)

/* Maybe the following should be allocated dynamically */
static struct cosa_data cosa_cards[MAX_CARDS];
static int nr_cards;

#ifdef COSA_ISA_AUTOPROBE
static int io[MAX_CARDS+1]  = { 0x220, 0x228, 0x210, 0x218, 0, };
/* NOTE: DMA is not autoprobed!!! */
static int dma[MAX_CARDS+1] = { 1, 7, 1, 7, 1, 7, 1, 7, 0, };
#else
static int io[MAX_CARDS+1];
static int dma[MAX_CARDS+1];
#endif
/* IRQ can be safely autoprobed */
static int irq[MAX_CARDS+1] = { -1, -1, -1, -1, -1, -1, 0, };

/* for class stuff*/
static struct class *cosa_class;

#ifdef MODULE
module_param_array(io, int, NULL, 0);
MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards");
module_param_array(dma, int, NULL, 0);
MODULE_PARM_DESC(dma, "The DMA channels of the COSA or SRP cards");

MODULE_AUTHOR("Jan \"Yenya\" Kasprzak, <kas@fi.muni.cz>");
MODULE_DESCRIPTION("Modular driver for the COSA or SRP synchronous card");
MODULE_LICENSE("GPL");
#endif

/* I use this mainly for testing purposes */
#ifdef COSA_SLOW_IO
#define cosa_outb outb_p
#define cosa_outw outw_p
#define cosa_inb  inb_p
#define cosa_inw  inw_p
#else
#define cosa_outb outb
#define cosa_outw outw
#define cosa_inb  inb
#define cosa_inw  inw
#endif

#define is_8bit(cosa)         (!(cosa->datareg & 0x08))

#define cosa_getstatus(cosa)  (cosa_inb(cosa->statusreg))
#define cosa_putstatus(cosa, stat)  (cosa_outb(stat, cosa->statusreg))
#define cosa_getdata16(cosa)  (cosa_inw(cosa->datareg))
#define cosa_getdata8(cosa)   (cosa_inb(cosa->datareg))
#define cosa_putdata16(cosa, dt)    (cosa_outw(dt, cosa->datareg))
#define cosa_putdata8(cosa, dt)     (cosa_outb(dt, cosa->datareg))

/* Initialization stuff */
static int cosa_probe(int ioaddr, int irq, int dma);

/* HW interface */
static void cosa_enable_rx(struct channel_data *chan);
static void cosa_disable_rx(struct channel_data *chan);
static int cosa_start_tx(struct channel_data *channel, char *buf, int size);
static void cosa_kick(struct cosa_data *cosa);
static int cosa_dma_able(struct channel_data *chan, char *buf, int data);

/* SPPP/HDLC stuff */
static void sppp_channel_init(struct channel_data *chan);
static void sppp_channel_delete(struct channel_data *chan);
static int cosa_sppp_open(struct net_device *d);
static int cosa_sppp_close(struct net_device *d);
static void cosa_sppp_timeout(struct net_device *d);
static int cosa_sppp_tx(struct sk_buff *skb, struct net_device *d);
static char *sppp_setup_rx(struct channel_data *channel, int size);
static int sppp_rx_done(struct channel_data *channel);
static int sppp_tx_done(struct channel_data *channel, int size);
static int cosa_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
static struct net_device_stats *cosa_net_stats(struct net_device *dev);

/* Character device */
static void chardev_channel_init(struct channel_data *chan);
static char *chrdev_setup_rx(struct channel_data *channel, int size);
static int chrdev_rx_done(struct channel_data *channel);
static int chrdev_tx_done(struct channel_data *channel, int size);
static ssize_t cosa_read(struct file *file,
      char __user *buf, size_t count, loff_t *ppos);
static ssize_t cosa_write(struct file *file,
      const char __user *buf, size_t count, loff_t *ppos);
static unsigned int cosa_poll(struct file *file, poll_table *poll);
static int cosa_open(struct inode *inode, struct file *file);
static int cosa_release(struct inode *inode, struct file *file);
static int cosa_chardev_ioctl(struct inode *inode, struct file *file,
      unsigned int cmd, unsigned long arg);
#ifdef COSA_FASYNC_WORKING
static int cosa_fasync(struct inode *inode, struct file *file, int on);
#endif

static const struct file_operations cosa_fops = {
      .owner            = THIS_MODULE,
      .llseek           = no_llseek,
      .read       = cosa_read,
      .write            = cosa_write,
      .poll       = cosa_poll,
      .ioctl            = cosa_chardev_ioctl,
      .open       = cosa_open,
      .release    = cosa_release,
#ifdef COSA_FASYNC_WORKING
      .fasync           = cosa_fasync,
#endif
};

/* Ioctls */
static int cosa_start(struct cosa_data *cosa, int address);
static int cosa_reset(struct cosa_data *cosa);
static int cosa_download(struct cosa_data *cosa, void __user *a);
static int cosa_readmem(struct cosa_data *cosa, void __user *a);

/* COSA/SRP ROM monitor */
static int download(struct cosa_data *cosa, const char __user *data, int addr, int len);
static int startmicrocode(struct cosa_data *cosa, int address);
static int readmem(struct cosa_data *cosa, char __user *data, int addr, int len);
static int cosa_reset_and_read_id(struct cosa_data *cosa, char *id);

/* Auxilliary functions */
static int get_wait_data(struct cosa_data *cosa);
static int put_wait_data(struct cosa_data *cosa, int data);
static int puthexnumber(struct cosa_data *cosa, int number);
static void put_driver_status(struct cosa_data *cosa);
static void put_driver_status_nolock(struct cosa_data *cosa);

/* Interrupt handling */
static irqreturn_t cosa_interrupt(int irq, void *cosa);

/* I/O ops debugging */
#ifdef DEBUG_IO
static void debug_data_in(struct cosa_data *cosa, int data);
static void debug_data_out(struct cosa_data *cosa, int data);
static void debug_data_cmd(struct cosa_data *cosa, int data);
static void debug_status_in(struct cosa_data *cosa, int status);
static void debug_status_out(struct cosa_data *cosa, int status);
#endif


/* ---------- Initialization stuff ---------- */

static int __init cosa_init(void)
{
      int i, err = 0;

      printk(KERN_INFO "cosa v1.08 (c) 1997-2000 Jan Kasprzak <kas@fi.muni.cz>\n");
#ifdef CONFIG_SMP
      printk(KERN_INFO "cosa: SMP found. Please mail any success/failure reports to the author.\n");
#endif
      if (cosa_major > 0) {
            if (register_chrdev(cosa_major, "cosa", &cosa_fops)) {
                  printk(KERN_WARNING "cosa: unable to get major %d\n",
                        cosa_major);
                  err = -EIO;
                  goto out;
            }
      } else {
            if (!(cosa_major=register_chrdev(0, "cosa", &cosa_fops))) {
                  printk(KERN_WARNING "cosa: unable to register chardev\n");
                  err = -EIO;
                  goto out;
            }
      }
      for (i=0; i<MAX_CARDS; i++)
            cosa_cards[i].num = -1;
      for (i=0; io[i] != 0 && i < MAX_CARDS; i++)
            cosa_probe(io[i], irq[i], dma[i]);
      if (!nr_cards) {
            printk(KERN_WARNING "cosa: no devices found.\n");
            unregister_chrdev(cosa_major, "cosa");
            err = -ENODEV;
            goto out;
      }
      cosa_class = class_create(THIS_MODULE, "cosa");
      if (IS_ERR(cosa_class)) {
            err = PTR_ERR(cosa_class);
            goto out_chrdev;
      }
      for (i=0; i<nr_cards; i++) {
            class_device_create(cosa_class, NULL, MKDEV(cosa_major, i),
                        NULL, "cosa%d", i);
      }
      err = 0;
      goto out;
      
out_chrdev:
      unregister_chrdev(cosa_major, "cosa");
out:
      return err;
}
module_init(cosa_init);

static void __exit cosa_exit(void)
{
      struct cosa_data *cosa;
      int i;
      printk(KERN_INFO "Unloading the cosa module\n");

      for (i=0; i<nr_cards; i++)
            class_device_destroy(cosa_class, MKDEV(cosa_major, i));
      class_destroy(cosa_class);
      for (cosa=cosa_cards; nr_cards--; cosa++) {
            /* Clean up the per-channel data */
            for (i=0; i<cosa->nchannels; i++) {
                  /* Chardev driver has no alloc'd per-channel data */
                  sppp_channel_delete(cosa->chan+i);
            }
            /* Clean up the per-card data */
            kfree(cosa->chan);
            kfree(cosa->bouncebuf);
            free_irq(cosa->irq, cosa);
            free_dma(cosa->dma);
            release_region(cosa->datareg,is_8bit(cosa)?2:4);
      }
      unregister_chrdev(cosa_major, "cosa");
}
module_exit(cosa_exit);

/*
 * This function should register all the net devices needed for the
 * single channel.
 */
static __inline__ void channel_init(struct channel_data *chan)
{
      sprintf(chan->name, "cosa%dc%d", chan->cosa->num, chan->num);

      /* Initialize the chardev data structures */
      chardev_channel_init(chan);

      /* Register the sppp interface */
      sppp_channel_init(chan);
}
      
static int cosa_probe(int base, int irq, int dma)
{
      struct cosa_data *cosa = cosa_cards+nr_cards;
      int i, err = 0;

      memset(cosa, 0, sizeof(struct cosa_data));

      /* Checking validity of parameters: */
      /* IRQ should be 2-7 or 10-15; negative IRQ means autoprobe */
      if ((irq >= 0  && irq < 2) || irq > 15 || (irq < 10 && irq > 7)) {
            printk (KERN_INFO "cosa_probe: invalid IRQ %d\n", irq);
            return -1;
      }
      /* I/O address should be between 0x100 and 0x3ff and should be
       * multiple of 8. */
      if (base < 0x100 || base > 0x3ff || base & 0x7) {
            printk (KERN_INFO "cosa_probe: invalid I/O address 0x%x\n",
                  base);
            return -1;
      }
      /* DMA should be 0,1 or 3-7 */
      if (dma < 0 || dma == 4 || dma > 7) {
            printk (KERN_INFO "cosa_probe: invalid DMA %d\n", dma);
            return -1;
      }
      /* and finally, on 16-bit COSA DMA should be 4-7 and 
       * I/O base should not be multiple of 0x10 */
      if (((base & 0x8) && dma < 4) || (!(base & 0x8) && dma > 3)) {
            printk (KERN_INFO "cosa_probe: 8/16 bit base and DMA mismatch"
                  " (base=0x%x, dma=%d)\n", base, dma);
            return -1;
      }

      cosa->dma = dma;
      cosa->datareg = base;
      cosa->statusreg = is_8bit(cosa)?base+1:base+2;
      spin_lock_init(&cosa->lock);

      if (!request_region(base, is_8bit(cosa)?2:4,"cosa"))
            return -1;
      
      if (cosa_reset_and_read_id(cosa, cosa->id_string) < 0) {
            printk(KERN_DEBUG "cosa: probe at 0x%x failed.\n", base);
            err = -1;
            goto err_out;
      }

      /* Test the validity of identification string */
      if (!strncmp(cosa->id_string, "SRP", 3))
            cosa->type = "srp";
      else if (!strncmp(cosa->id_string, "COSA", 4))
            cosa->type = is_8bit(cosa)? "cosa8": "cosa16";
      else {
/* Print a warning only if we are not autoprobing */
#ifndef COSA_ISA_AUTOPROBE
            printk(KERN_INFO "cosa: valid signature not found at 0x%x.\n",
                  base);
#endif
            err = -1;
            goto err_out;
      }
      /* Update the name of the region now we know the type of card */ 
      release_region(base, is_8bit(cosa)?2:4);
      if (!request_region(base, is_8bit(cosa)?2:4, cosa->type)) {
            printk(KERN_DEBUG "cosa: changing name at 0x%x failed.\n", base);
            return -1;
      }

      /* Now do IRQ autoprobe */
      if (irq < 0) {
            unsigned long irqs;
/*          printk(KERN_INFO "IRQ autoprobe\n"); */
            irqs = probe_irq_on();
            /* 
             * Enable interrupt on tx buffer empty (it sure is) 
             * really sure ?
             * FIXME: When this code is not used as module, we should
             * probably call udelay() instead of the interruptible sleep.
             */
            set_current_state(TASK_INTERRUPTIBLE);
            cosa_putstatus(cosa, SR_TX_INT_ENA);
            schedule_timeout(30);
            irq = probe_irq_off(irqs);
            /* Disable all IRQs from the card */
            cosa_putstatus(cosa, 0);
            /* Empty the received data register */
            cosa_getdata8(cosa);

            if (irq < 0) {
                  printk (KERN_INFO "cosa IRQ autoprobe: multiple interrupts obtained (%d, board at 0x%x)\n",
                        irq, cosa->datareg);
                  err = -1;
                  goto err_out;
            }
            if (irq == 0) {
                  printk (KERN_INFO "cosa IRQ autoprobe: no interrupt obtained (board at 0x%x)\n",
                        cosa->datareg);
            /*    return -1; */
            }
      }

      cosa->irq = irq;
      cosa->num = nr_cards;
      cosa->usage = 0;
      cosa->nchannels = 2;    /* FIXME: how to determine this? */

      if (request_irq(cosa->irq, cosa_interrupt, 0, cosa->type, cosa)) {
            err = -1;
            goto err_out;
      }
      if (request_dma(cosa->dma, cosa->type)) {
            err = -1;
            goto err_out1;
      }
      
      cosa->bouncebuf = kmalloc(COSA_MTU, GFP_KERNEL|GFP_DMA);
      if (!cosa->bouncebuf) {
            err = -ENOMEM;
            goto err_out2;
      }
      sprintf(cosa->name, "cosa%d", cosa->num);

      /* Initialize the per-channel data */
      cosa->chan = kcalloc(cosa->nchannels, sizeof(struct channel_data), GFP_KERNEL);
      if (!cosa->chan) {
              err = -ENOMEM;
            goto err_out3;
      }
      for (i=0; i<cosa->nchannels; i++) {
            cosa->chan[i].cosa = cosa;
            cosa->chan[i].num = i;
            channel_init(cosa->chan+i);
      }

      printk (KERN_INFO "cosa%d: %s (%s at 0x%x irq %d dma %d), %d channels\n",
            cosa->num, cosa->id_string, cosa->type,
            cosa->datareg, cosa->irq, cosa->dma, cosa->nchannels);

      return nr_cards++;
err_out3:
      kfree(cosa->bouncebuf);
err_out2:
      free_dma(cosa->dma);
err_out1:
      free_irq(cosa->irq, cosa);
err_out:    
      release_region(cosa->datareg,is_8bit(cosa)?2:4);
      printk(KERN_NOTICE "cosa%d: allocating resources failed\n",
             cosa->num);
      return err;
}


/*---------- SPPP/HDLC netdevice ---------- */

static void cosa_setup(struct net_device *d)
{
      d->open = cosa_sppp_open;
      d->stop = cosa_sppp_close;
      d->hard_start_xmit = cosa_sppp_tx;
      d->do_ioctl = cosa_sppp_ioctl;
      d->get_stats = cosa_net_stats;
      d->tx_timeout = cosa_sppp_timeout;
      d->watchdog_timeo = TX_TIMEOUT;
}

static void sppp_channel_init(struct channel_data *chan)
{
      struct net_device *d;
      chan->if_ptr = &chan->pppdev;
      d = alloc_netdev(0, chan->name, cosa_setup);
      if (!d) {
            printk(KERN_WARNING "%s: alloc_netdev failed.\n", chan->name);
            return;
      }
      chan->pppdev.dev = d;
      d->base_addr = chan->cosa->datareg;
      d->irq = chan->cosa->irq;
      d->dma = chan->cosa->dma;
      d->priv = chan;
      sppp_attach(&chan->pppdev);
      if (register_netdev(d)) {
            printk(KERN_WARNING "%s: register_netdev failed.\n", d->name);
            sppp_detach(d);
            free_netdev(d);
            chan->pppdev.dev = NULL;
            return;
      }
}

static void sppp_channel_delete(struct channel_data *chan)
{
      unregister_netdev(chan->pppdev.dev);
      sppp_detach(chan->pppdev.dev);
      free_netdev(chan->pppdev.dev);
      chan->pppdev.dev = NULL;
}

static int cosa_sppp_open(struct net_device *d)
{
      struct channel_data *chan = d->priv;
      int err;
      unsigned long flags;

      if (!(chan->cosa->firmware_status & COSA_FW_START)) {
            printk(KERN_NOTICE "%s: start the firmware first (status %d)\n",
                  chan->cosa->name, chan->cosa->firmware_status);
            return -EPERM;
      }
      spin_lock_irqsave(&chan->cosa->lock, flags);
      if (chan->usage != 0) {
            printk(KERN_WARNING "%s: sppp_open called with usage count %d\n",
                  chan->name, chan->usage);
            spin_unlock_irqrestore(&chan->cosa->lock, flags);
            return -EBUSY;
      }
      chan->setup_rx = sppp_setup_rx;
      chan->tx_done = sppp_tx_done;
      chan->rx_done = sppp_rx_done;
      chan->usage=-1;
      chan->cosa->usage++;
      spin_unlock_irqrestore(&chan->cosa->lock, flags);

      err = sppp_open(d);
      if (err) {
            spin_lock_irqsave(&chan->cosa->lock, flags);
            chan->usage=0;
            chan->cosa->usage--;
            
            spin_unlock_irqrestore(&chan->cosa->lock, flags);
            return err;
      }

      netif_start_queue(d);
      cosa_enable_rx(chan);
      return 0;
}

static int cosa_sppp_tx(struct sk_buff *skb, struct net_device *dev)
{
      struct channel_data *chan = dev->priv;

      netif_stop_queue(dev);

      chan->tx_skb = skb;
      cosa_start_tx(chan, skb->data, skb->len);
      return 0;
}

static void cosa_sppp_timeout(struct net_device *dev)
{
      struct channel_data *chan = dev->priv;

      if (test_bit(RXBIT, &chan->cosa->rxtx)) {
            chan->stats.rx_errors++;
            chan->stats.rx_missed_errors++;
      } else {
            chan->stats.tx_errors++;
            chan->stats.tx_aborted_errors++;
      }
      cosa_kick(chan->cosa);
      if (chan->tx_skb) {
            dev_kfree_skb(chan->tx_skb);
            chan->tx_skb = NULL;
      }
      netif_wake_queue(dev);
}

static int cosa_sppp_close(struct net_device *d)
{
      struct channel_data *chan = d->priv;
      unsigned long flags;

      netif_stop_queue(d);
      sppp_close(d);
      cosa_disable_rx(chan);
      spin_lock_irqsave(&chan->cosa->lock, flags);
      if (chan->rx_skb) {
            kfree_skb(chan->rx_skb);
            chan->rx_skb = NULL;
      }
      if (chan->tx_skb) {
            kfree_skb(chan->tx_skb);
            chan->tx_skb = NULL;
      }
      chan->usage=0;
      chan->cosa->usage--;
      spin_unlock_irqrestore(&chan->cosa->lock, flags);
      return 0;
}

static char *sppp_setup_rx(struct channel_data *chan, int size)
{
      /*
       * We can safely fall back to non-dma-able memory, because we have
       * the cosa->bouncebuf pre-allocated.
       */
      if (chan->rx_skb)
            kfree_skb(chan->rx_skb);
      chan->rx_skb = dev_alloc_skb(size);
      if (chan->rx_skb == NULL) {
            printk(KERN_NOTICE "%s: Memory squeeze, dropping packet\n",
                  chan->name);
            chan->stats.rx_dropped++;
            return NULL;
      }
      chan->pppdev.dev->trans_start = jiffies;
      return skb_put(chan->rx_skb, size);
}

static int sppp_rx_done(struct channel_data *chan)
{
      if (!chan->rx_skb) {
            printk(KERN_WARNING "%s: rx_done with empty skb!\n",
                  chan->name);
            chan->stats.rx_errors++;
            chan->stats.rx_frame_errors++;
            return 0;
      }
      chan->rx_skb->protocol = htons(ETH_P_WAN_PPP);
      chan->rx_skb->dev = chan->pppdev.dev;
      skb_reset_mac_header(chan->rx_skb);
      chan->stats.rx_packets++;
      chan->stats.rx_bytes += chan->cosa->rxsize;
      netif_rx(chan->rx_skb);
      chan->rx_skb = NULL;
      chan->pppdev.dev->last_rx = jiffies;
      return 0;
}

/* ARGSUSED */
static int sppp_tx_done(struct channel_data *chan, int size)
{
      if (!chan->tx_skb) {
            printk(KERN_WARNING "%s: tx_done with empty skb!\n",
                  chan->name);
            chan->stats.tx_errors++;
            chan->stats.tx_aborted_errors++;
            return 1;
      }
      dev_kfree_skb_irq(chan->tx_skb);
      chan->tx_skb = NULL;
      chan->stats.tx_packets++;
      chan->stats.tx_bytes += size;
      netif_wake_queue(chan->pppdev.dev);
      return 1;
}

static struct net_device_stats *cosa_net_stats(struct net_device *dev)
{
      struct channel_data *chan = dev->priv;
      return &chan->stats;
}


/*---------- Character device ---------- */

static void chardev_channel_init(struct channel_data *chan)
{
      init_MUTEX(&chan->rsem);
      init_MUTEX(&chan->wsem);
}

static ssize_t cosa_read(struct file *file,
      char __user *buf, size_t count, loff_t *ppos)
{
      DECLARE_WAITQUEUE(wait, current);
      unsigned long flags;
      struct channel_data *chan = file->private_data;
      struct cosa_data *cosa = chan->cosa;
      char *kbuf;

      if (!(cosa->firmware_status & COSA_FW_START)) {
            printk(KERN_NOTICE "%s: start the firmware first (status %d)\n",
                  cosa->name, cosa->firmware_status);
            return -EPERM;
      }
      if (down_interruptible(&chan->rsem))
            return -ERESTARTSYS;
      
      if ((chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL)) == NULL) {
            printk(KERN_INFO "%s: cosa_read() - OOM\n", cosa->name);
            up(&chan->rsem);
            return -ENOMEM;
      }

      chan->rx_status = 0;
      cosa_enable_rx(chan);
      spin_lock_irqsave(&cosa->lock, flags);
      add_wait_queue(&chan->rxwaitq, &wait);
      while(!chan->rx_status) {
            current->state = TASK_INTERRUPTIBLE;
            spin_unlock_irqrestore(&cosa->lock, flags);
            schedule();
            spin_lock_irqsave(&cosa->lock, flags);
            if (signal_pending(current) && chan->rx_status == 0) {
                  chan->rx_status = 1;
                  remove_wait_queue(&chan->rxwaitq, &wait);
                  current->state = TASK_RUNNING;
                  spin_unlock_irqrestore(&cosa->lock, flags);
                  up(&chan->rsem);
                  return -ERESTARTSYS;
            }
      }
      remove_wait_queue(&chan->rxwaitq, &wait);
      current->state = TASK_RUNNING;
      kbuf = chan->rxdata;
      count = chan->rxsize;
      spin_unlock_irqrestore(&cosa->lock, flags);
      up(&chan->rsem);

      if (copy_to_user(buf, kbuf, count)) {
            kfree(kbuf);
            return -EFAULT;
      }
      kfree(kbuf);
      return count;
}

static char *chrdev_setup_rx(struct channel_data *chan, int size)
{
      /* Expect size <= COSA_MTU */
      chan->rxsize = size;
      return chan->rxdata;
}

static int chrdev_rx_done(struct channel_data *chan)
{
      if (chan->rx_status) { /* Reader has died */
            kfree(chan->rxdata);
            up(&chan->wsem);
      }
      chan->rx_status = 1;
      wake_up_interruptible(&chan->rxwaitq);
      return 1;
}


static ssize_t cosa_write(struct file *file,
      const char __user *buf, size_t count, loff_t *ppos)
{
      DECLARE_WAITQUEUE(wait, current);
      struct channel_data *chan = file->private_data;
      struct cosa_data *cosa = chan->cosa;
      unsigned long flags;
      char *kbuf;

      if (!(cosa->firmware_status & COSA_FW_START)) {
            printk(KERN_NOTICE "%s: start the firmware first (status %d)\n",
                  cosa->name, cosa->firmware_status);
            return -EPERM;
      }
      if (down_interruptible(&chan->wsem))
            return -ERESTARTSYS;

      if (count > COSA_MTU)
            count = COSA_MTU;
      
      /* Allocate the buffer */
      if ((kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA)) == NULL) {
            printk(KERN_NOTICE "%s: cosa_write() OOM - dropping packet\n",
                  cosa->name);
            up(&chan->wsem);
            return -ENOMEM;
      }
      if (copy_from_user(kbuf, buf, count)) {
            up(&chan->wsem);
            kfree(kbuf);
            return -EFAULT;
      }
      chan->tx_status=0;
      cosa_start_tx(chan, kbuf, count);

      spin_lock_irqsave(&cosa->lock, flags);
      add_wait_queue(&chan->txwaitq, &wait);
      while(!chan->tx_status) {
            current->state = TASK_INTERRUPTIBLE;
            spin_unlock_irqrestore(&cosa->lock, flags);
            schedule();
            spin_lock_irqsave(&cosa->lock, flags);
            if (signal_pending(current) && chan->tx_status == 0) {
                  chan->tx_status = 1;
                  remove_wait_queue(&chan->txwaitq, &wait);
                  current->state = TASK_RUNNING;
                  chan->tx_status = 1;
                  spin_unlock_irqrestore(&cosa->lock, flags);
                  return -ERESTARTSYS;
            }
      }
      remove_wait_queue(&chan->txwaitq, &wait);
      current->state = TASK_RUNNING;
      up(&chan->wsem);
      spin_unlock_irqrestore(&cosa->lock, flags);
      kfree(kbuf);
      return count;
}

static int chrdev_tx_done(struct channel_data *chan, int size)
{
      if (chan->tx_status) { /* Writer was interrupted */
            kfree(chan->txbuf);
            up(&chan->wsem);
      }
      chan->tx_status = 1;
      wake_up_interruptible(&chan->txwaitq);
      return 1;
}

static unsigned int cosa_poll(struct file *file, poll_table *poll)
{
      printk(KERN_INFO "cosa_poll is here\n");
      return 0;
}

static int cosa_open(struct inode *inode, struct file *file)
{
      struct cosa_data *cosa;
      struct channel_data *chan;
      unsigned long flags;
      int n;

      if ((n=iminor(file->f_path.dentry->d_inode)>>CARD_MINOR_BITS)
            >= nr_cards)
            return -ENODEV;
      cosa = cosa_cards+n;

      if ((n=iminor(file->f_path.dentry->d_inode)
            & ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels)
            return -ENODEV;
      chan = cosa->chan + n;
      
      file->private_data = chan;

      spin_lock_irqsave(&cosa->lock, flags);

      if (chan->usage < 0) { /* in netdev mode */
            spin_unlock_irqrestore(&cosa->lock, flags);
            return -EBUSY;
      }
      cosa->usage++;
      chan->usage++;

      chan->tx_done = chrdev_tx_done;
      chan->setup_rx = chrdev_setup_rx;
      chan->rx_done = chrdev_rx_done;
      spin_unlock_irqrestore(&cosa->lock, flags);
      return 0;
}

static int cosa_release(struct inode *inode, struct file *file)
{
      struct channel_data *channel = file->private_data;
      struct cosa_data *cosa;
      unsigned long flags;

      cosa = channel->cosa;
      spin_lock_irqsave(&cosa->lock, flags);
      cosa->usage--;
      channel->usage--;
      spin_unlock_irqrestore(&cosa->lock, flags);
      return 0;
}

#ifdef COSA_FASYNC_WORKING
static struct fasync_struct *fasync[256] = { NULL, };

/* To be done ... */
static int cosa_fasync(struct inode *inode, struct file *file, int on)
{
        int port = iminor(inode);
        int rv = fasync_helper(inode, file, on, &fasync[port]);
        return rv < 0 ? rv : 0;
}
#endif


/* ---------- Ioctls ---------- */

/*
 * Ioctl subroutines can safely be made inline, because they are called
 * only from cosa_ioctl().
 */
static inline int cosa_reset(struct cosa_data *cosa)
{
      char idstring[COSA_MAX_ID_STRING];
      if (cosa->usage > 1)
            printk(KERN_INFO "cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n",
                  cosa->num, cosa->usage);
      cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START);
      if (cosa_reset_and_read_id(cosa, idstring) < 0) {
            printk(KERN_NOTICE "cosa%d: reset failed\n", cosa->num);
            return -EIO;
      }
      printk(KERN_INFO "cosa%d: resetting device: %s\n", cosa->num,
            idstring);
      cosa->firmware_status |= COSA_FW_RESET;
      return 0;
}

/* High-level function to download data into COSA memory. Calls download() */
static inline int cosa_download(struct cosa_data *cosa, void __user *arg)
{
      struct cosa_download d;
      int i;

      if (cosa->usage > 1)
            printk(KERN_INFO "%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n",
                  cosa->name, cosa->usage);
      if (!(cosa->firmware_status & COSA_FW_RESET)) {
            printk(KERN_NOTICE "%s: reset the card first (status %d).\n",
                  cosa->name, cosa->firmware_status);
            return -EPERM;
      }
      
      if (copy_from_user(&d, arg, sizeof(d)))
            return -EFAULT;

      if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE)
            return -EINVAL;
      if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE)
            return -EINVAL;


      /* If something fails, force the user to reset the card */
      cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD);

      i = download(cosa, d.code, d.len, d.addr);
      if (i < 0) {
            printk(KERN_NOTICE "cosa%d: microcode download failed: %d\n",
                  cosa->num, i);
            return -EIO;
      }
      printk(KERN_INFO "cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n",
            cosa->num, d.len, d.addr);
      cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD;
      return 0;
}

/* High-level function to read COSA memory. Calls readmem() */
static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg)
{
      struct cosa_download d;
      int i;

      if (cosa->usage > 1)
            printk(KERN_INFO "cosa%d: WARNING: readmem requested with "
                  "cosa->usage > 1 (%d). Odd things may happen.\n",
                  cosa->num, cosa->usage);
      if (!(cosa->firmware_status & COSA_FW_RESET)) {
            printk(KERN_NOTICE "%s: reset the card first (status %d).\n",
                  cosa->name, cosa->firmware_status);
            return -EPERM;
      }

      if (copy_from_user(&d, arg, sizeof(d)))
            return -EFAULT;

      /* If something fails, force the user to reset the card */
      cosa->firmware_status &= ~COSA_FW_RESET;

      i = readmem(cosa, d.code, d.len, d.addr);
      if (i < 0) {
            printk(KERN_NOTICE "cosa%d: reading memory failed: %d\n",
                  cosa->num, i);
            return -EIO;
      }
      printk(KERN_INFO "cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n",
            cosa->num, d.len, d.addr);
      cosa->firmware_status |= COSA_FW_RESET;
      return 0;
}

/* High-level function to start microcode. Calls startmicrocode(). */
static inline int cosa_start(struct cosa_data *cosa, int address)
{
      int i;

      if (cosa->usage > 1)
            printk(KERN_INFO "cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n",
                  cosa->num, cosa->usage);

      if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD))
            != (COSA_FW_RESET|COSA_FW_DOWNLOAD)) {
            printk(KERN_NOTICE "%s: download the microcode and/or reset the card first (status %d).\n",
                  cosa->name, cosa->firmware_status);
            return -EPERM;
      }
      cosa->firmware_status &= ~COSA_FW_RESET;
      if ((i=startmicrocode(cosa, address)) < 0) {
            printk(KERN_NOTICE "cosa%d: start microcode at 0x%04x failed: %d\n",
                  cosa->num, address, i);
            return -EIO;
      }
      printk(KERN_INFO "cosa%d: starting microcode at 0x%04x\n",
            cosa->num, address);
      cosa->startaddr = address;
      cosa->firmware_status |= COSA_FW_START;
      return 0;
}
            
/* Buffer of size at least COSA_MAX_ID_STRING is expected */
static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string)
{
      int l = strlen(cosa->id_string)+1;
      if (copy_to_user(string, cosa->id_string, l))
            return -EFAULT;
      return l;
}

/* Buffer of size at least COSA_MAX_ID_STRING is expected */
static inline int cosa_gettype(struct cosa_data *cosa, char __user *string)
{
      int l = strlen(cosa->type)+1;
      if (copy_to_user(string, cosa->type, l))
            return -EFAULT;
      return l;
}

static int cosa_ioctl_common(struct cosa_data *cosa,
      struct channel_data *channel, unsigned int cmd, unsigned long arg)
{
      void __user *argp = (void __user *)arg;
      switch(cmd) {
      case COSAIORSET:  /* Reset the device */
            if (!capable(CAP_NET_ADMIN))
                  return -EACCES;
            return cosa_reset(cosa);
      case COSAIOSTRT:  /* Start the firmware */
            if (!capable(CAP_SYS_RAWIO))
                  return -EACCES;
            return cosa_start(cosa, arg);
      case COSAIODOWNLD:      /* Download the firmware */
            if (!capable(CAP_SYS_RAWIO))
                  return -EACCES;
            
            return cosa_download(cosa, argp);
      case COSAIORMEM:
            if (!capable(CAP_SYS_RAWIO))
                  return -EACCES;
            return cosa_readmem(cosa, argp);
      case COSAIORTYPE:
            return cosa_gettype(cosa, argp);
      case COSAIORIDSTR:
            return cosa_getidstr(cosa, argp);
      case COSAIONRCARDS:
            return nr_cards;
      case COSAIONRCHANS:
            return cosa->nchannels;
      case COSAIOBMSET:
            if (!capable(CAP_SYS_RAWIO))
                  return -EACCES;
            if (is_8bit(cosa))
                  return -EINVAL;
            if (arg != COSA_BM_OFF && arg != COSA_BM_ON)
                  return -EINVAL;
            cosa->busmaster = arg;
            return 0;
      case COSAIOBMGET:
            return cosa->busmaster;
      }
      return -ENOIOCTLCMD;
}

static int cosa_sppp_ioctl(struct net_device *dev, struct ifreq *ifr,
      int cmd)
{
      int rv;
      struct channel_data *chan = dev->priv;
      rv = cosa_ioctl_common(chan->cosa, chan, cmd, (unsigned long)ifr->ifr_data);
      if (rv == -ENOIOCTLCMD) {
            return sppp_do_ioctl(dev, ifr, cmd);
      }
      return rv;
}

static int cosa_chardev_ioctl(struct inode *inode, struct file *file,
      unsigned int cmd, unsigned long arg)
{
      struct channel_data *channel = file->private_data;
      struct cosa_data *cosa = channel->cosa;
      return cosa_ioctl_common(cosa, channel, cmd, arg);
}


/*---------- HW layer interface ---------- */

/*
 * The higher layer can bind itself to the HW layer by setting the callbacks
 * in the channel_data structure and by using these routines.
 */
static void cosa_enable_rx(struct channel_data *chan)
{
      struct cosa_data *cosa = chan->cosa;

      if (!test_and_set_bit(chan->num, &cosa->rxbitmap))
            put_driver_status(cosa);
}

static void cosa_disable_rx(struct channel_data *chan)
{
      struct cosa_data *cosa = chan->cosa;

      if (test_and_clear_bit(chan->num, &cosa->rxbitmap))
            put_driver_status(cosa);
}

/*
 * FIXME: This routine probably should check for cosa_start_tx() called when
 * the previous transmit is still unfinished. In this case the non-zero
 * return value should indicate to the caller that the queuing(sp?) up
 * the transmit has failed.
 */
static int cosa_start_tx(struct channel_data *chan, char *buf, int len)
{
      struct cosa_data *cosa = chan->cosa;
      unsigned long flags;
#ifdef DEBUG_DATA
      int i;

      printk(KERN_INFO "cosa%dc%d: starting tx(0x%x)", chan->cosa->num,
            chan->num, len);
      for (i=0; i<len; i++)
            printk(" %02x", buf[i]&0xff);
      printk("\n");
#endif
      spin_lock_irqsave(&cosa->lock, flags);
      chan->txbuf = buf;
      chan->txsize = len;
      if (len > COSA_MTU)
            chan->txsize = COSA_MTU;
      spin_unlock_irqrestore(&cosa->lock, flags);

      /* Tell the firmware we are ready */
      set_bit(chan->num, &cosa->txbitmap);
      put_driver_status(cosa);

      return 0;
}

static void put_driver_status(struct cosa_data *cosa)
{
      unsigned long flags;
      int status;

      spin_lock_irqsave(&cosa->lock, flags);

      status = (cosa->rxbitmap ? DRIVER_RX_READY : 0)
            | (cosa->txbitmap ? DRIVER_TX_READY : 0)
            | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT)
                  &DRIVER_TXMAP_MASK : 0);
      if (!cosa->rxtx) {
            if (cosa->rxbitmap|cosa->txbitmap) {
                  if (!cosa->enabled) {
                        cosa_putstatus(cosa, SR_RX_INT_ENA);
#ifdef DEBUG_IO
                        debug_status_out(cosa, SR_RX_INT_ENA);
#endif
                        cosa->enabled = 1;
                  }
            } else if (cosa->enabled) {
                  cosa->enabled = 0;
                  cosa_putstatus(cosa, 0);
#ifdef DEBUG_IO
                  debug_status_out(cosa, 0);
#endif
            }
            cosa_putdata8(cosa, status);
#ifdef DEBUG_IO
            debug_data_cmd(cosa, status);
#endif
      }
      spin_unlock_irqrestore(&cosa->lock, flags);
}

static void put_driver_status_nolock(struct cosa_data *cosa)
{
      int status;

      status = (cosa->rxbitmap ? DRIVER_RX_READY : 0)
            | (cosa->txbitmap ? DRIVER_TX_READY : 0)
            | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT)
                  &DRIVER_TXMAP_MASK : 0);

      if (cosa->rxbitmap|cosa->txbitmap) {
            cosa_putstatus(cosa, SR_RX_INT_ENA);
#ifdef DEBUG_IO
            debug_status_out(cosa, SR_RX_INT_ENA);
#endif
            cosa->enabled = 1;
      } else {
            cosa_putstatus(cosa, 0);
#ifdef DEBUG_IO
            debug_status_out(cosa, 0);
#endif
            cosa->enabled = 0;
      }
      cosa_putdata8(cosa, status);
#ifdef DEBUG_IO
      debug_data_cmd(cosa, status);
#endif
}

/*
 * The "kickme" function: When the DMA times out, this is called to
 * clean up the driver status.
 * FIXME: Preliminary support, the interface is probably wrong.
 */
static void cosa_kick(struct cosa_data *cosa)
{
      unsigned long flags, flags1;
      char *s = "(probably) IRQ";

      if (test_bit(RXBIT, &cosa->rxtx))
            s = "RX DMA";
      if (test_bit(TXBIT, &cosa->rxtx))
            s = "TX DMA";

      printk(KERN_INFO "%s: %s timeout - restarting.\n", cosa->name, s); 
      spin_lock_irqsave(&cosa->lock, flags);
      cosa->rxtx = 0;

      flags1 = claim_dma_lock();
      disable_dma(cosa->dma);
      clear_dma_ff(cosa->dma);
      release_dma_lock(flags1);

      /* FIXME: Anything else? */
      udelay(100);
      cosa_putstatus(cosa, 0);
      udelay(100);
      (void) cosa_getdata8(cosa);
      udelay(100);
      cosa_putdata8(cosa, 0);
      udelay(100);
      put_driver_status_nolock(cosa);
      spin_unlock_irqrestore(&cosa->lock, flags);
}

/*
 * Check if the whole buffer is DMA-able. It means it is below the 16M of
 * physical memory and doesn't span the 64k boundary. For now it seems
 * SKB's never do this, but we'll check this anyway.
 */
static int cosa_dma_able(struct channel_data *chan, char *buf, int len)
{
      static int count;
      unsigned long b = (unsigned long)buf;
      if (b+len >= MAX_DMA_ADDRESS)
            return 0;
      if ((b^ (b+len)) & 0x10000) {
            if (count++ < 5)
                  printk(KERN_INFO "%s: packet spanning a 64k boundary\n",
                        chan->name);
            return 0;
      }
      return 1;
}


/* ---------- The SRP/COSA ROM monitor functions ---------- */

/*
 * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=",
 * drivers need to say 4-digit hex number meaning start address of the microcode
 * separated by a single space. Monitor replies by saying " =". Now driver
 * has to write 4-digit hex number meaning the last byte address ended
 * by a single space. Monitor has to reply with a space. Now the download
 * begins. After the download monitor replies with "\r\n." (CR LF dot).
 */
static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address)
{
      int i;

      if (put_wait_data(cosa, 'w') == -1) return -1;
      if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;}
      if (get_wait_data(cosa) != '=') return -3;

      if (puthexnumber(cosa, address) < 0) return -4;
      if (put_wait_data(cosa, ' ') == -1) return -10;
      if (get_wait_data(cosa) != ' ') return -11;
      if (get_wait_data(cosa) != '=') return -12;

      if (puthexnumber(cosa, address+length-1) < 0) return -13;
      if (put_wait_data(cosa, ' ') == -1) return -18;
      if (get_wait_data(cosa) != ' ') return -19;

      while (length--) {
            char c;
#ifndef SRP_DOWNLOAD_AT_BOOT
            if (get_user(c, microcode))
                  return -23; /* ??? */
#else
            c = *microcode;
#endif
            if (put_wait_data(cosa, c) == -1)
                  return -20;
            microcode++;
      }

      if (get_wait_data(cosa) != '\r') return -21;
      if (get_wait_data(cosa) != '\n') return -22;
      if (get_wait_data(cosa) != '.') return -23;
#if 0
      printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num);
#endif
      return 0;
}


/*
 * Starting microcode is done via the "g" command of the SRP monitor.
 * The chat should be the following: "g" "g=" "<addr><CR>"
 * "<CR><CR><LF><CR><LF>".
 */
static int startmicrocode(struct cosa_data *cosa, int address)
{
      if (put_wait_data(cosa, 'g') == -1) return -1;
      if (get_wait_data(cosa) != 'g') return -2;
      if (get_wait_data(cosa) != '=') return -3;

      if (puthexnumber(cosa, address) < 0) return -4;
      if (put_wait_data(cosa, '\r') == -1) return -5;
      
      if (get_wait_data(cosa) != '\r') return -6;
      if (get_wait_data(cosa) != '\r') return -7;
      if (get_wait_data(cosa) != '\n') return -8;
      if (get_wait_data(cosa) != '\r') return -9;
      if (get_wait_data(cosa) != '\n') return -10;
#if 0
      printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num);
#endif
      return 0;
}

/*
 * Reading memory is done via the "r" command of the SRP monitor.
 * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " "
 * Then driver can read the data and the conversation is finished
 * by SRP monitor sending "<CR><LF>." (dot at the end).
 *
 * This routine is not needed during the normal operation and serves
 * for debugging purposes only.
 */
static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address)
{
      if (put_wait_data(cosa, 'r') == -1) return -1;
      if ((get_wait_data(cosa)) != 'r') return -2;
      if ((get_wait_data(cosa)) != '=') return -3;

      if (puthexnumber(cosa, address) < 0) return -4;
      if (put_wait_data(cosa, ' ') == -1) return -5;
      if (get_wait_data(cosa) != ' ') return -6;
      if (get_wait_data(cosa) != '=') return -7;

      if (puthexnumber(cosa, address+length-1) < 0) return -8;
      if (put_wait_data(cosa, ' ') == -1) return -9;
      if (get_wait_data(cosa) != ' ') return -10;

      while (length--) {
            char c;
            int i;
            if ((i=get_wait_data(cosa)) == -1) {
                  printk (KERN_INFO "cosa: 0x%04x bytes remaining\n",
                        length);
                  return -11;
            }
            c=i;
#if 1
            if (put_user(c, microcode))
                  return -23; /* ??? */
#else
            *microcode = c;
#endif
            microcode++;
      }

      if (get_wait_data(cosa) != '\r') return -21;
      if (get_wait_data(cosa) != '\n') return -22;
      if (get_wait_data(cosa) != '.') return -23;
#if 0
      printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num);
#endif
      return 0;
}

/*
 * This function resets the device and reads the initial prompt
 * of the device's ROM monitor.
 */
static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring)
{
      int i=0, id=0, prev=0, curr=0;

      /* Reset the card ... */
      cosa_putstatus(cosa, 0);
      cosa_getdata8(cosa);
      cosa_putstatus(cosa, SR_RST);
#ifdef MODULE
      msleep(500);
#else
      udelay(5*100000);
#endif
      /* Disable all IRQs from the card */
      cosa_putstatus(cosa, 0);

      /*
       * Try to read the ID string. The card then prints out the
       * identification string ended by the "\n\x2e".
       *
       * The following loop is indexed through i (instead of id)
       * to avoid looping forever when for any reason
       * the port returns '\r', '\n' or '\x2e' permanently.
       */
      for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) {
            if ((curr = get_wait_data(cosa)) == -1) {
                  return -1;
            }
            curr &= 0xff;
            if (curr != '\r' && curr != '\n' && curr != 0x2e)
                  idstring[id++] = curr;
            if (curr == 0x2e && prev == '\n')
                  break;
      }
      /* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */
      idstring[id] = '\0';
      return id;
}


/* ---------- Auxiliary routines for COSA/SRP monitor ---------- */

/*
 * This routine gets the data byte from the card waiting for the SR_RX_RDY
 * bit to be set in a loop. It should be used in the exceptional cases
 * only (for example when resetting the card or downloading the firmware.
 */
static int get_wait_data(struct cosa_data *cosa)
{
      int retries = 1000;

      while (--retries) {
            /* read data and return them */
            if (cosa_getstatus(cosa) & SR_RX_RDY) {
                  short r;
                  r = cosa_getdata8(cosa);
#if 0
                  printk(KERN_INFO "cosa: get_wait_data returning after %d retries\n", 999-retries);
#endif
                  return r;
            }
            /* sleep if not ready to read */
            schedule_timeout_interruptible(1);
      }
      printk(KERN_INFO "cosa: timeout in get_wait_data (status 0x%x)\n",
            cosa_getstatus(cosa));
      return -1;
}

/*
 * This routine puts the data byte to the card waiting for the SR_TX_RDY
 * bit to be set in a loop. It should be used in the exceptional cases
 * only (for example when resetting the card or downloading the firmware).
 */
static int put_wait_data(struct cosa_data *cosa, int data)
{
      int retries = 1000;
      while (--retries) {
            /* read data and return them */
            if (cosa_getstatus(cosa) & SR_TX_RDY) {
                  cosa_putdata8(cosa, data);
#if 0
                  printk(KERN_INFO "Putdata: %d retries\n", 999-retries);
#endif
                  return 0;
            }
#if 0
            /* sleep if not ready to read */
            schedule_timeout_interruptible(1);
#endif
      }
      printk(KERN_INFO "cosa%d: timeout in put_wait_data (status 0x%x)\n",
            cosa->num, cosa_getstatus(cosa));
      return -1;
}
      
/* 
 * The following routine puts the hexadecimal number into the SRP monitor
 * and verifies the proper echo of the sent bytes. Returns 0 on success,
 * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed,
 * (-2,-4,-6,-8) means that reading echo failed.
 */
static int puthexnumber(struct cosa_data *cosa, int number)
{
      char temp[5];
      int i;

      /* Well, I should probably replace this by something faster. */
      sprintf(temp, "%04X", number);
      for (i=0; i<4; i++) {
            if (put_wait_data(cosa, temp[i]) == -1) {
                  printk(KERN_NOTICE "cosa%d: puthexnumber failed to write byte %d\n",
                        cosa->num, i);
                  return -1-2*i;
            }
            if (get_wait_data(cosa) != temp[i]) {
                  printk(KERN_NOTICE "cosa%d: puthexhumber failed to read echo of byte %d\n",
                        cosa->num, i);
                  return -2-2*i;
            }
      }
      return 0;
}


/* ---------- Interrupt routines ---------- */

/*
 * There are three types of interrupt:
 * At the beginning of transmit - this handled is in tx_interrupt(),
 * at the beginning of receive - it is in rx_interrupt() and
 * at the end of transmit/receive - it is the eot_interrupt() function.
 * These functions are multiplexed by cosa_interrupt() according to the
 * COSA status byte. I have moved the rx/tx/eot interrupt handling into
 * separate functions to make it more readable. These functions are inline,
 * so there should be no overhead of function call.
 * 
 * In the COSA bus-master mode, we need to tell the card the address of a
 * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait.
 * It's time to use the bottom half :-(
 */

/*
 * Transmit interrupt routine - called when COSA is willing to obtain
 * data from the OS. The most tricky part of the routine is selection
 * of channel we (OS) want to send packet for. For SRP we should probably
 * use the round-robin approach. The newer COSA firmwares have a simple
 * flow-control - in the status word has bits 2 and 3 set to 1 means that the
 * channel 0 or 1 doesn't want to receive data.
 *
 * It seems there is a bug in COSA firmware (need to trace it further):
 * When the driver status says that the kernel has no more data for transmit
 * (e.g. at the end of TX DMA) and then the kernel changes its mind
 * (e.g. new packet is queued to hard_start_xmit()), the card issues
 * the TX interrupt but does not mark the channel as ready-to-transmit.
 * The fix seems to be to push the packet to COSA despite its request.
 * We first try to obey the card's opinion, and then fall back to forced TX.
 */
static inline void tx_interrupt(struct cosa_data *cosa, int status)
{
      unsigned long flags, flags1;
#ifdef DEBUG_IRQS
      printk(KERN_INFO "cosa%d: SR_DOWN_REQUEST status=0x%04x\n",
            cosa->num, status);
#endif
      spin_lock_irqsave(&cosa->lock, flags);
      set_bit(TXBIT, &cosa->rxtx);
      if (!test_bit(IRQBIT, &cosa->rxtx)) {
            /* flow control, see the comment above */
            int i=0;
            if (!cosa->txbitmap) {
                  printk(KERN_WARNING "%s: No channel wants data "
                        "in TX IRQ. Expect DMA timeout.",
                        cosa->name);
                  put_driver_status_nolock(cosa);
                  clear_bit(TXBIT, &cosa->rxtx);
                  spin_unlock_irqrestore(&cosa->lock, flags);
                  return;
            }
            while(1) {
                  cosa->txchan++;
                  i++;
                  if (cosa->txchan >= cosa->nchannels)
                        cosa->txchan = 0;
                  if (!(cosa->txbitmap & (1<<cosa->txchan)))
                        continue;
                  if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT)))
                        break;
                  /* in second pass, accept first ready-to-TX channel */
                  if (i > cosa->nchannels) {
                        /* Can be safely ignored */
#ifdef DEBUG_IRQS
                        printk(KERN_DEBUG "%s: Forcing TX "
                              "to not-ready channel %d\n",
                              cosa->name, cosa->txchan);
#endif
                        break;
                  }
            }

            cosa->txsize = cosa->chan[cosa->txchan].txsize;
            if (cosa_dma_able(cosa->chan+cosa->txchan,
                  cosa->chan[cosa->txchan].txbuf, cosa->txsize)) {
                  cosa->txbuf = cosa->chan[cosa->txchan].txbuf;
            } else {
                  memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf,
                        cosa->txsize);
                  cosa->txbuf = cosa->bouncebuf;
            }
      }

      if (is_8bit(cosa)) {
            if (!test_bit(IRQBIT, &cosa->rxtx)) {
                  cosa_putstatus(cosa, SR_TX_INT_ENA);
                  cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)|
                        ((cosa->txsize >> 8) & 0x1f));
#ifdef DEBUG_IO
                  debug_status_out(cosa, SR_TX_INT_ENA);
                  debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)|
                                ((cosa->txsize >> 8) & 0x1f));
                  debug_data_in(cosa, cosa_getdata8(cosa));
#else
                  cosa_getdata8(cosa);
#endif
                  set_bit(IRQBIT, &cosa->rxtx);
                  spin_unlock_irqrestore(&cosa->lock, flags);
                  return;
            } else {
                  clear_bit(IRQBIT, &cosa->rxtx);
                  cosa_putstatus(cosa, 0);
                  cosa_putdata8(cosa, cosa->txsize&0xff);
#ifdef DEBUG_IO
                  debug_status_out(cosa, 0);
                  debug_data_out(cosa, cosa->txsize&0xff);
#endif
            }
      } else {
            cosa_putstatus(cosa, SR_TX_INT_ENA);
            cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000)
                  | (cosa->txsize & 0x1fff));
#ifdef DEBUG_IO
            debug_status_out(cosa, SR_TX_INT_ENA);
            debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000)
                        | (cosa->txsize & 0x1fff));
            debug_data_in(cosa, cosa_getdata8(cosa));
            debug_status_out(cosa, 0);
#else
            cosa_getdata8(cosa);
#endif
            cosa_putstatus(cosa, 0);
      }

      if (cosa->busmaster) {
            unsigned long addr = virt_to_bus(cosa->txbuf);
            int count=0;
            printk(KERN_INFO "busmaster IRQ\n");
            while (!(cosa_getstatus(cosa)&SR_TX_RDY)) {
                  count++;
                  udelay(10);
                  if (count > 1000) break;
            }
            printk(KERN_INFO "status %x\n", cosa_getstatus(cosa));
            printk(KERN_INFO "ready after %d loops\n", count);
            cosa_putdata16(cosa, (addr >> 16)&0xffff);

            count = 0;
            while (!(cosa_getstatus(cosa)&SR_TX_RDY)) {
                  count++;
                  if (count > 1000) break;
                  udelay(10);
            }
            printk(KERN_INFO "ready after %d loops\n", count);
            cosa_putdata16(cosa, addr &0xffff);
            flags1 = claim_dma_lock();
            set_dma_mode(cosa->dma, DMA_MODE_CASCADE);
            enable_dma(cosa->dma);
            release_dma_lock(flags1);
      } else {
            /* start the DMA */
            flags1 = claim_dma_lock();
            disable_dma(cosa->dma);
            clear_dma_ff(cosa->dma);
            set_dma_mode(cosa->dma, DMA_MODE_WRITE);
            set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf));
            set_dma_count(cosa->dma, cosa->txsize);
            enable_dma(cosa->dma);
            release_dma_lock(flags1);
      }
      cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA);
#ifdef DEBUG_IO
      debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA);
#endif
      spin_unlock_irqrestore(&cosa->lock, flags);
}

static inline void rx_interrupt(struct cosa_data *cosa, int status)
{
      unsigned long flags;
#ifdef DEBUG_IRQS
      printk(KERN_INFO "cosa%d: SR_UP_REQUEST\n", cosa->num);
#endif

      spin_lock_irqsave(&cosa->lock, flags);
      set_bit(RXBIT, &cosa->rxtx);

      if (is_8bit(cosa)) {
            if (!test_bit(IRQBIT, &cosa->rxtx)) {
                  set_bit(IRQBIT, &cosa->rxtx);
                  put_driver_status_nolock(cosa);
                  cosa->rxsize = cosa_getdata8(cosa) <<8;
#ifdef DEBUG_IO
                  debug_data_in(cosa, cosa->rxsize >> 8);
#endif
                  spin_unlock_irqrestore(&cosa->lock, flags);
                  return;
            } else {
                  clear_bit(IRQBIT, &cosa->rxtx);
                  cosa->rxsize |= cosa_getdata8(cosa) & 0xff;
#ifdef DEBUG_IO
                  debug_data_in(cosa, cosa->rxsize & 0xff);
#endif
#if 0
                  printk(KERN_INFO "cosa%d: receive rxsize = (0x%04x).\n",
                        cosa->num, cosa->rxsize);
#endif
            }
      } else {
            cosa->rxsize = cosa_getdata16(cosa);
#ifdef DEBUG_IO
            debug_data_in(cosa, cosa->rxsize);
#endif
#if 0
            printk(KERN_INFO "cosa%d: receive rxsize = (0x%04x).\n",
                  cosa->num, cosa->rxsize);
#endif
      }
      if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) {
            printk(KERN_WARNING "%s: rx for unknown channel (0x%04x)\n",
                  cosa->name, cosa->rxsize);
            spin_unlock_irqrestore(&cosa->lock, flags);
            goto reject;
      }
      cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13);
      cosa->rxsize &= 0x1fff;
      spin_unlock_irqrestore(&cosa->lock, flags);

      cosa->rxbuf = NULL;
      if (cosa->rxchan->setup_rx)
            cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize);

      if (!cosa->rxbuf) {
reject:           /* Reject the packet */
            printk(KERN_INFO "cosa%d: rejecting packet on channel %d\n",
                  cosa->num, cosa->rxchan->num);
            cosa->rxbuf = cosa->bouncebuf;
      }

      /* start the DMA */
      flags = claim_dma_lock();
      disable_dma(cosa->dma);
      clear_dma_ff(cosa->dma);
      set_dma_mode(cosa->dma, DMA_MODE_READ);
      if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) {
            set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf));
      } else {
            set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf));
      }
      set_dma_count(cosa->dma, (cosa->rxsize&0x1fff));
      enable_dma(cosa->dma);
      release_dma_lock(flags);
      spin_lock_irqsave(&cosa->lock, flags);
      cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA);
      if (!is_8bit(cosa) && (status & SR_TX_RDY))
            cosa_putdata8(cosa, DRIVER_RX_READY);
#ifdef DEBUG_IO
      debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA);
      if (!is_8bit(cosa) && (status & SR_TX_RDY))
            debug_data_cmd(cosa, DRIVER_RX_READY);
#endif
      spin_unlock_irqrestore(&cosa->lock, flags);
}

static inline void eot_interrupt(struct cosa_data *cosa, int status)
{
      unsigned long flags, flags1;
      spin_lock_irqsave(&cosa->lock, flags);
      flags1 = claim_dma_lock();
      disable_dma(cosa->dma);
      clear_dma_ff(cosa->dma);
      release_dma_lock(flags1);
      if (test_bit(TXBIT, &cosa->rxtx)) {
            struct channel_data *chan = cosa->chan+cosa->txchan;
            if (chan->tx_done)
                  if (chan->tx_done(chan, cosa->txsize))
                        clear_bit(chan->num, &cosa->txbitmap);
      } else if (test_bit(RXBIT, &cosa->rxtx)) {
#ifdef DEBUG_DATA
      {
            int i;
            printk(KERN_INFO "cosa%dc%d: done rx(0x%x)", cosa->num, 
                  cosa->rxchan->num, cosa->rxsize);
            for (i=0; i<cosa->rxsize; i++)
                  printk (" %02x", cosa->rxbuf[i]&0xff);
            printk("\n");
      }
#endif
            /* Packet for unknown channel? */
            if (cosa->rxbuf == cosa->bouncebuf)
                  goto out;
            if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize))
                  memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize);
            if (cosa->rxchan->rx_done)
                  if (cosa->rxchan->rx_done(cosa->rxchan))
                        clear_bit(cosa->rxchan->num, &cosa->rxbitmap);
      } else {
            printk(KERN_NOTICE "cosa%d: unexpected EOT interrupt\n",
                  cosa->num);
      }
      /*
       * Clear the RXBIT, TXBIT and IRQBIT (the latest should be
       * cleared anyway). We should do it as soon as possible
       * so that we can tell the COSA we are done and to give it a time
       * for recovery.
       */
out:
      cosa->rxtx = 0;
      put_driver_status_nolock(cosa);
      spin_unlock_irqrestore(&cosa->lock, flags);
}

static irqreturn_t cosa_interrupt(int irq, void *cosa_)
{
      unsigned status;
      int count = 0;
      struct cosa_data *cosa = cosa_;
again:
      status = cosa_getstatus(cosa);
#ifdef DEBUG_IRQS
      printk(KERN_INFO "cosa%d: got IRQ, status 0x%02x\n", cosa->num,
            status & 0xff);
#endif
#ifdef DEBUG_IO
      debug_status_in(cosa, status);
#endif
      switch (status & SR_CMD_FROM_SRP_MASK) {
      case SR_DOWN_REQUEST:
            tx_interrupt(cosa, status);
            break;
      case SR_UP_REQUEST:
            rx_interrupt(cosa, status);
            break;
      case SR_END_OF_TRANSFER:
            eot_interrupt(cosa, status);
            break;
      default:
            /* We may be too fast for SRP. Try to wait a bit more. */
            if (count++ < 100) {
                  udelay(100);
                  goto again;
            }
            printk(KERN_INFO "cosa%d: unknown status 0x%02x in IRQ after %d retries\n",
                  cosa->num, status & 0xff, count);
      }
#ifdef DEBUG_IRQS
      if (count)
            printk(KERN_INFO "%s: %d-times got unknown status in IRQ\n",
                  cosa->name, count);
      else
            printk(KERN_INFO "%s: returning from IRQ\n", cosa->name);
#endif
      return IRQ_HANDLED;
}


/* ---------- I/O debugging routines ---------- */
/*
 * These routines can be used to monitor COSA/SRP I/O and to printk()
 * the data being transferred on the data and status I/O port in a
 * readable way.
 */

#ifdef DEBUG_IO
static void debug_status_in(struct cosa_data *cosa, int status)
{
      char *s;
      switch(status & SR_CMD_FROM_SRP_MASK) {
      case SR_UP_REQUEST:
            s = "RX_REQ";
            break;
      case SR_DOWN_REQUEST:
            s = "TX_REQ";
            break;
      case SR_END_OF_TRANSFER:
            s = "ET_REQ";
            break;
      default:
            s = "NO_REQ";
            break;
      }
      printk(KERN_INFO "%s: IO: status -> 0x%02x (%s%s%s%s)\n",
            cosa->name,
            status,
            status & SR_USR_RQ ? "USR_RQ|":"",
            status & SR_TX_RDY ? "TX_RDY|":"",
            status & SR_RX_RDY ? "RX_RDY|":"",
            s);
}

static void debug_status_out(struct cosa_data *cosa, int status)
{
      printk(KERN_INFO "%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n",
            cosa->name,
            status,
            status & SR_RX_DMA_ENA  ? "RXDMA|":"!rxdma|",
            status & SR_TX_DMA_ENA  ? "TXDMA|":"!txdma|",
            status & SR_RST         ? "RESET|":"",
            status & SR_USR_INT_ENA ? "USRINT|":"!usrint|",
            status & SR_TX_INT_ENA  ? "TXINT|":"!txint|",
            status & SR_RX_INT_ENA  ? "RXINT":"!rxint");
}

static void debug_data_in(struct cosa_data *cosa, int data)
{
      printk(KERN_INFO "%s: IO: data -> 0x%04x\n", cosa->name, data);
}

static void debug_data_out(struct cosa_data *cosa, int data)
{
      printk(KERN_INFO "%s: IO: data <- 0x%04x\n", cosa->name, data);
}

static void debug_data_cmd(struct cosa_data *cosa, int data)
{
      printk(KERN_INFO "%s: IO: data <- 0x%04x (%s|%s)\n",
            cosa->name, data,
            data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy",
            data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy");
}
#endif

/* EOF -- this file has not been truncated */

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