Initial import

1 files changed, 2050 insertions, 0 deletions

diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
new file mode 100644
index 000000000..bcfa01add
--- /dev/null
+++ b/drivers/net/wan/cosa.c
@@ -0,0 +1,2050 @@
+/* $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>
+ *  Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ *  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 two modes (character or network device).
+ *
+ * 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
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/hdlc.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+
+#undef COSA_SLOW_IO	/* for testing purposes only */
+
+#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 {
+	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 mutex rlock;
+	struct semaphore wsem;
+	char *rxdata;
+	int rxsize;
+	wait_queue_head_t txwaitq, rxwaitq;
+	int tx_status, rx_status;
+
+	/* generic HDLC device parts */
+	struct net_device *netdev;
+	struct sk_buff *rx_skb, *tx_skb;
+};
+
+/* 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 DEFINE_MUTEX(cosa_chardev_mutex);
+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);
+
+/* Network device stuff */
+static int cosa_net_attach(struct net_device *dev, unsigned short encoding,
+			   unsigned short parity);
+static int cosa_net_open(struct net_device *d);
+static int cosa_net_close(struct net_device *d);
+static void cosa_net_timeout(struct net_device *d);
+static netdev_tx_t cosa_net_tx(struct sk_buff *skb, struct net_device *d);
+static char *cosa_net_setup_rx(struct channel_data *channel, int size);
+static int cosa_net_rx_done(struct channel_data *channel);
+static int cosa_net_tx_done(struct channel_data *channel, int size);
+static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
+
+/* Character device */
+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 long cosa_chardev_ioctl(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,
+	.unlocked_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);
+
+/* Auxiliary 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
+
+static inline struct channel_data* dev_to_chan(struct net_device *dev)
+{
+	return (struct channel_data *)dev_to_hdlc(dev)->priv;
+}
+
+/* ---------- Initialization stuff ---------- */
+
+static int __init cosa_init(void)
+{
+	int i, err = 0;
+
+	if (cosa_major > 0) {
+		if (register_chrdev(cosa_major, "cosa", &cosa_fops)) {
+			pr_warn("unable to get major %d\n", cosa_major);
+			err = -EIO;
+			goto out;
+		}
+	} else {
+		if (!(cosa_major=register_chrdev(0, "cosa", &cosa_fops))) {
+			pr_warn("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) {
+		pr_warn("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++)
+		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;
+
+	for (i = 0; i < nr_cards; i++)
+		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 */
+			unregister_hdlc_device(cosa->chan[i].netdev);
+			free_netdev(cosa->chan[i].netdev);
+		}
+		/* 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);
+
+static const struct net_device_ops cosa_ops = {
+	.ndo_open       = cosa_net_open,
+	.ndo_stop       = cosa_net_close,
+	.ndo_change_mtu = hdlc_change_mtu,
+	.ndo_start_xmit = hdlc_start_xmit,
+	.ndo_do_ioctl   = cosa_net_ioctl,
+	.ndo_tx_timeout = cosa_net_timeout,
+};
+
+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)) {
+		pr_info("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) {
+		pr_info("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) {
+		pr_info("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)) {
+		pr_info("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 "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
+		pr_info("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 "changing name at 0x%x failed.\n", base);
+		return -1;
+	}
+
+	/* Now do IRQ autoprobe */
+	if (irq < 0) {
+		unsigned long irqs;
+/*		pr_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) {
+			pr_info("multiple interrupts obtained (%d, board at 0x%x)\n",
+				irq, cosa->datareg);
+			err = -1;
+			goto err_out;
+		}
+		if (irq == 0) {
+			pr_info("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++) {
+		struct channel_data *chan = &cosa->chan[i];
+
+		chan->cosa = cosa;
+		chan->num = i;
+		sprintf(chan->name, "cosa%dc%d", chan->cosa->num, i);
+
+		/* Initialize the chardev data structures */
+		mutex_init(&chan->rlock);
+		sema_init(&chan->wsem, 1);
+
+		/* Register the network interface */
+		if (!(chan->netdev = alloc_hdlcdev(chan))) {
+			pr_warn("%s: alloc_hdlcdev failed\n", chan->name);
+			err = -ENOMEM;
+			goto err_hdlcdev;
+		}
+		dev_to_hdlc(chan->netdev)->attach = cosa_net_attach;
+		dev_to_hdlc(chan->netdev)->xmit = cosa_net_tx;
+		chan->netdev->netdev_ops = &cosa_ops;
+		chan->netdev->watchdog_timeo = TX_TIMEOUT;
+		chan->netdev->base_addr = chan->cosa->datareg;
+		chan->netdev->irq = chan->cosa->irq;
+		chan->netdev->dma = chan->cosa->dma;
+		if (register_hdlc_device(chan->netdev)) {
+			netdev_warn(chan->netdev,
+				    "register_hdlc_device() failed\n");
+			free_netdev(chan->netdev);
+			goto err_hdlcdev;
+		}
+	}
+
+	pr_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_hdlcdev:
+	while (i-- > 0) {
+		unregister_hdlc_device(cosa->chan[i].netdev);
+		free_netdev(cosa->chan[i].netdev);
+	}
+	kfree(cosa->chan);
+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);
+	pr_notice("cosa%d: allocating resources failed\n", cosa->num);
+	return err;
+}
+
+
+/*---------- network device ---------- */
+
+static int cosa_net_attach(struct net_device *dev, unsigned short encoding,
+			   unsigned short parity)
+{
+	if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
+		return 0;
+	return -EINVAL;
+}
+
+static int cosa_net_open(struct net_device *dev)
+{
+	struct channel_data *chan = dev_to_chan(dev);
+	int err;
+	unsigned long flags;
+
+	if (!(chan->cosa->firmware_status & COSA_FW_START)) {
+		pr_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) {
+		pr_warn("%s: cosa_net_open called with usage count %d\n",
+			chan->name, chan->usage);
+		spin_unlock_irqrestore(&chan->cosa->lock, flags);
+		return -EBUSY;
+	}
+	chan->setup_rx = cosa_net_setup_rx;
+	chan->tx_done = cosa_net_tx_done;
+	chan->rx_done = cosa_net_rx_done;
+	chan->usage = -1;
+	chan->cosa->usage++;
+	spin_unlock_irqrestore(&chan->cosa->lock, flags);
+
+	err = hdlc_open(dev);
+	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(dev);
+	cosa_enable_rx(chan);
+	return 0;
+}
+
+static netdev_tx_t cosa_net_tx(struct sk_buff *skb,
+				     struct net_device *dev)
+{
+	struct channel_data *chan = dev_to_chan(dev);
+
+	netif_stop_queue(dev);
+
+	chan->tx_skb = skb;
+	cosa_start_tx(chan, skb->data, skb->len);
+	return NETDEV_TX_OK;
+}
+
+static void cosa_net_timeout(struct net_device *dev)
+{
+	struct channel_data *chan = dev_to_chan(dev);
+
+	if (test_bit(RXBIT, &chan->cosa->rxtx)) {
+		chan->netdev->stats.rx_errors++;
+		chan->netdev->stats.rx_missed_errors++;
+	} else {
+		chan->netdev->stats.tx_errors++;
+		chan->netdev->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_net_close(struct net_device *dev)
+{
+	struct channel_data *chan = dev_to_chan(dev);
+	unsigned long flags;
+
+	netif_stop_queue(dev);
+	hdlc_close(dev);
+	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 *cosa_net_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.
+	 */
+	kfree_skb(chan->rx_skb);
+	chan->rx_skb = dev_alloc_skb(size);
+	if (chan->rx_skb == NULL) {
+		pr_notice("%s: Memory squeeze, dropping packet\n", chan->name);
+		chan->netdev->stats.rx_dropped++;
+		return NULL;
+	}
+	chan->netdev->trans_start = jiffies;
+	return skb_put(chan->rx_skb, size);
+}
+
+static int cosa_net_rx_done(struct channel_data *chan)
+{
+	if (!chan->rx_skb) {
+		pr_warn("%s: rx_done with empty skb!\n", chan->name);
+		chan->netdev->stats.rx_errors++;
+		chan->netdev->stats.rx_frame_errors++;
+		return 0;
+	}
+	chan->rx_skb->protocol = hdlc_type_trans(chan->rx_skb, chan->netdev);
+	chan->rx_skb->dev = chan->netdev;
+	skb_reset_mac_header(chan->rx_skb);
+	chan->netdev->stats.rx_packets++;
+	chan->netdev->stats.rx_bytes += chan->cosa->rxsize;
+	netif_rx(chan->rx_skb);
+	chan->rx_skb = NULL;
+	return 0;
+}
+
+/* ARGSUSED */
+static int cosa_net_tx_done(struct channel_data *chan, int size)
+{
+	if (!chan->tx_skb) {
+		pr_warn("%s: tx_done with empty skb!\n", chan->name);
+		chan->netdev->stats.tx_errors++;
+		chan->netdev->stats.tx_aborted_errors++;
+		return 1;
+	}
+	dev_kfree_skb_irq(chan->tx_skb);
+	chan->tx_skb = NULL;
+	chan->netdev->stats.tx_packets++;
+	chan->netdev->stats.tx_bytes += size;
+	netif_wake_queue(chan->netdev);
+	return 1;
+}
+
+/*---------- Character device ---------- */
+
+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)) {
+		pr_notice("%s: start the firmware first (status %d)\n",
+			  cosa->name, cosa->firmware_status);
+		return -EPERM;
+	}
+	if (mutex_lock_interruptible(&chan->rlock))
+		return -ERESTARTSYS;
+	
+	chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL);
+	if (chan->rxdata == NULL) {
+		mutex_unlock(&chan->rlock);
+		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) {
+		set_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);
+			__set_current_state(TASK_RUNNING);
+			spin_unlock_irqrestore(&cosa->lock, flags);
+			mutex_unlock(&chan->rlock);
+			return -ERESTARTSYS;
+		}
+	}
+	remove_wait_queue(&chan->rxwaitq, &wait);
+	__set_current_state(TASK_RUNNING);
+	kbuf = chan->rxdata;
+	count = chan->rxsize;
+	spin_unlock_irqrestore(&cosa->lock, flags);
+	mutex_unlock(&chan->rlock);
+
+	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)) {
+		pr_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 */
+	kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA);
+	if (kbuf == NULL) {
+		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) {
+		set_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);
+			__set_current_state(TASK_RUNNING);
+			chan->tx_status = 1;
+			spin_unlock_irqrestore(&cosa->lock, flags);
+			up(&chan->wsem);
+			return -ERESTARTSYS;
+		}
+	}
+	remove_wait_queue(&chan->txwaitq, &wait);
+	__set_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)
+{
+	pr_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;
+	int ret = 0;
+
+	mutex_lock(&cosa_chardev_mutex);
+	if ((n=iminor(file_inode(file))>>CARD_MINOR_BITS)
+		>= nr_cards) {
+		ret = -ENODEV;
+		goto out;
+	}
+	cosa = cosa_cards+n;
+
+	if ((n=iminor(file_inode(file))
+		& ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) {
+		ret = -ENODEV;
+		goto out;
+	}
+	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);
+		ret = -EBUSY;
+		goto out;
+	}
+	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);
+out:
+	mutex_unlock(&cosa_chardev_mutex);
+	return ret;
+}
+
+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);
+
+	return fasync_helper(inode, file, on, &fasync[port]);
+}
+#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)
+		pr_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) {
+		pr_notice("cosa%d: reset failed\n", cosa->num);
+		return -EIO;
+	}
+	pr_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)
+		pr_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)) {
+		pr_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) {
+		pr_notice("cosa%d: microcode download failed: %d\n",
+			  cosa->num, i);
+		return -EIO;
+	}
+	pr_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)
+		pr_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)) {
+		pr_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) {
+		pr_notice("cosa%d: reading memory failed: %d\n", cosa->num, i);
+		return -EIO;
+	}
+	pr_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)
+		pr_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)) {
+		pr_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) {
+		pr_notice("cosa%d: start microcode at 0x%04x failed: %d\n",
+			  cosa->num, address, i);
+		return -EIO;
+	}
+	pr_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_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	int rv;
+	struct channel_data *chan = dev_to_chan(dev);
+	rv = cosa_ioctl_common(chan->cosa, chan, cmd,
+			       (unsigned long)ifr->ifr_data);
+	if (rv != -ENOIOCTLCMD)
+		return rv;
+	return hdlc_ioctl(dev, ifr, cmd);
+}
+
+static long cosa_chardev_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	struct channel_data *channel = file->private_data;
+	struct cosa_data *cosa;
+	long ret;
+
+	mutex_lock(&cosa_chardev_mutex);
+	cosa = channel->cosa;
+	ret = cosa_ioctl_common(cosa, channel, cmd, arg);
+	mutex_unlock(&cosa_chardev_mutex);
+	return ret;
+}
+
+
+/*---------- 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;
+
+	pr_info("cosa%dc%d: starting tx(0x%x)",
+		chan->cosa->num, chan->num, len);
+	for (i=0; i<len; i++)
+		pr_cont(" %02x", buf[i]&0xff);
+	pr_cont("\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";
+
+	pr_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)
+			pr_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) {
+			pr_info("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);
+	msleep(500);
+	/* 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
+			pr_info("get_wait_data returning after %d retries\n",
+				999-retries);
+#endif
+			return r;
+		}
+		/* sleep if not ready to read */
+		schedule_timeout_interruptible(1);
+	}
+	pr_info("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
+			pr_info("Putdata: %d retries\n", 999-retries);
+#endif
+			return 0;
+		}
+#if 0
+		/* sleep if not ready to read */
+		schedule_timeout_interruptible(1);
+#endif
+	}
+	pr_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) {
+			pr_notice("cosa%d: puthexnumber failed to write byte %d\n",
+				  cosa->num, i);
+			return -1-2*i;
+		}
+		if (get_wait_data(cosa) != temp[i]) {
+			pr_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
+	pr_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) {
+			pr_warn("%s: No channel wants data in TX IRQ. Expect DMA timeout.\n",
+				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;
+		pr_info("busmaster IRQ\n");
+		while (!(cosa_getstatus(cosa)&SR_TX_RDY)) {
+			count++;
+			udelay(10);
+			if (count > 1000) break;
+		}
+		pr_info("status %x\n", cosa_getstatus(cosa));
+		pr_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);
+		}
+		pr_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
+	pr_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
+			pr_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
+		pr_info("cosa%d: receive rxsize = (0x%04x)\n",
+			cosa->num, cosa->rxsize);
+#endif
+	}
+	if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) {
+		pr_warn("%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 */
+		pr_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;
+		pr_info("cosa%dc%d: done rx(0x%x)",
+			cosa->num, cosa->rxchan->num, cosa->rxsize);
+		for (i=0; i<cosa->rxsize; i++)
+			pr_cont(" %02x", cosa->rxbuf[i]&0xff);
+		pr_cont("\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 {
+		pr_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
+	pr_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;
+		}
+		pr_info("cosa%d: unknown status 0x%02x in IRQ after %d retries\n",
+			cosa->num, status & 0xff, count);
+	}
+#ifdef DEBUG_IRQS
+	if (count)
+		pr_info("%s: %d-times got unknown status in IRQ\n",
+			cosa->name, count);
+	else
+		pr_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;
+	}
+	pr_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)
+{
+	pr_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)
+{
+	pr_info("%s: IO: data -> 0x%04x\n", cosa->name, data);
+}
+
+static void debug_data_out(struct cosa_data *cosa, int data)
+{
+	pr_info("%s: IO: data <- 0x%04x\n", cosa->name, data);
+}
+
+static void debug_data_cmd(struct cosa_data *cosa, int data)
+{
+	pr_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 */