text: /*-
   * Cronyx-Sigma adapter driver for FreeBSD.
   * Supports PPP/HDLC and Cisco/HDLC protocol in synchronous mode,
   * and asynchronous channels with full modem control.
   * Keepalive protocol implemented in both Cisco and PPP modes.
   *
   * Copyright (C) 1994-2002 Cronyx Engineering.
   * Author: Serge Vakulenko, <vak@cronyx.ru>
   *
   * Copyright (C) 1999-2004 Cronyx Engineering.
   * Rewritten on DDK, ported to NETGRAPH, rewritten for FreeBSD 3.x-5.x by
   * Kurakin Roman, <rik@cronyx.ru>
   *
   * This software is distributed with NO WARRANTIES, not even the implied
   * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   *
   * Authors grant any other persons or organisations a permission to use,
   * modify and redistribute this software in source and binary forms,
   * as long as this message is kept with the software, all derivative
   * works or modified versions.
   *
   * Cronyx Id: if_cx.c,v 1.1.2.34 2004/06/23 17:09:13 rik Exp $
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <sys/param.h>
  
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/module.h>
  #include <sys/priv.h>
  #include <sys/proc.h>
  #include <sys/mbuf.h>
  #include <sys/sockio.h>
  #include <sys/malloc.h>
  #include <sys/socket.h>
  #include <sys/sysctl.h>
  #include <sys/conf.h>
  #include <sys/errno.h>
  #include <sys/serial.h>
  #include <sys/tty.h>
  #include <sys/bus.h>
  #include <machine/bus.h>
  #include <sys/rman.h>
  #include <isa/isavar.h>
  #include <sys/fcntl.h>
  #include <sys/interrupt.h>
  #include <vm/vm.h>
  #include <vm/pmap.h>
  #include <net/if.h>
  #include <net/if_var.h>
  #include <machine/cpufunc.h>
  #include <machine/cserial.h>
  #include <machine/resource.h>
  #include <dev/cx/machdep.h>
  #include <dev/cx/cxddk.h>
  #include <dev/cx/cronyxfw.h>
  #include "opt_ng_cronyx.h"
  #ifdef NETGRAPH_CRONYX
  #   include "opt_netgraph.h"
  #   include <netgraph/ng_message.h>
  #   include <netgraph/netgraph.h>
  #   include <dev/cx/ng_cx.h>
  #else
  #   include <net/if_types.h>
  #   include <net/if_sppp.h>
  #   define PP_CISCO IFF_LINK2
  #   include <net/bpf.h>
  #endif
  
  #define NCX	1
  
  /* If we don't have Cronyx's sppp version, we don't have fr support via sppp */
  #ifndef PP_FR
  #define PP_FR 0
  #endif
  
  #define CX_DEBUG(d,s)	({if (d->chan->debug) {\
  				printf ("%s: ", d->name); printf s;}})
  #define CX_DEBUG2(d,s)	({if (d->chan->debug>1) {\
  				printf ("%s: ", d->name); printf s;}})
  
  #define CX_LOCK_NAME	"cxX"
  
  #define CX_LOCK(_bd)		mtx_lock (&(_bd)->cx_mtx)
  #define CX_UNLOCK(_bd)		mtx_unlock (&(_bd)->cx_mtx)
  #define CX_LOCK_ASSERT(_bd)	mtx_assert (&(_bd)->cx_mtx, MA_OWNED)
  
  typedef struct _async_q {
  	int beg;
  	int end;
  	#define BF_SZ 14400
  	int buf[BF_SZ+1];
  } async_q;
  
  #define AQ_GSZ(q)	((BF_SZ + (q)->end - (q)->beg)%BF_SZ)
  #define AQ_PUSH(q,c)	{*((q)->buf + (q)->end) = c;\
  			(q)->end = ((q)->end + 1)%BF_SZ;}
  #define AQ_POP(q,c)	{c = *((q)->buf + (q)->beg);\
  			(q)->beg = ((q)->beg + 1)%BF_SZ;}
  
  static void cx_identify		__P((driver_t *, device_t));
  static int cx_probe		__P((device_t));
  static int cx_attach		__P((device_t));
  static int cx_detach		__P((device_t));
  static t_open_t			cx_topen;
  static t_modem_t		cx_tmodem;
  static t_close_t		cx_tclose;
  
  static device_method_t cx_isa_methods [] = {
  	DEVMETHOD(device_identify,	cx_identify),
  	DEVMETHOD(device_probe,		cx_probe),
  	DEVMETHOD(device_attach,	cx_attach),
  	DEVMETHOD(device_detach,	cx_detach),
  
  	DEVMETHOD_END
  };
  
  typedef struct _cx_dma_mem_t {
  	unsigned long	phys;
  	void		*virt;
  	size_t		size;
  	bus_dma_tag_t	dmat;
  	bus_dmamap_t	mapp;
  } cx_dma_mem_t;
  
  typedef struct _drv_t {
  	char name [8];
  	cx_chan_t *chan;
  	cx_board_t *board;
  	cx_dma_mem_t dmamem;
  	struct tty *tty;
  	struct callout dcd_timeout_handle;
  	unsigned callout;
  	unsigned lock;
  	int open_dev;
  	int cd;
  	int running;
  #ifdef NETGRAPH
  	char	nodename [NG_NODESIZ];
  	hook_p	hook;
  	hook_p	debug_hook;
  	node_p	node;
  	struct	ifqueue lo_queue;
  	struct	ifqueue hi_queue;
  #else
  	struct	ifqueue queue;
  	struct	ifnet *ifp;
  #endif
  	short	timeout;
  	struct	callout timeout_handle;
  	struct	cdev *devt;
  	async_q	aqueue;
  #define CX_READ 1
  #define CX_WRITE 2
  	int intr_action;
  	short atimeout;
  } drv_t;
  
  typedef struct _bdrv_t {
  	cx_board_t	*board;
  	struct resource	*base_res;
  	struct resource	*drq_res;
  	struct resource	*irq_res;
  	int		base_rid;
  	int		drq_rid;
  	int		irq_rid;
  	void		*intrhand;
  	drv_t		channel [NCHAN];
  	struct mtx	cx_mtx;
  } bdrv_t;
  
  static driver_t cx_isa_driver = {
  	"cx",
  	cx_isa_methods,
  	sizeof (bdrv_t),
  };
  
  static devclass_t cx_devclass;
  
  extern long csigma_fw_len;
  extern const char *csigma_fw_version;
  extern const char *csigma_fw_date;
  extern const char *csigma_fw_copyright;
  extern const cr_dat_tst_t csigma_fw_tvec[];
  extern const u_char csigma_fw_data[];
  static void cx_oproc (struct tty *tp);
  static int cx_param (struct tty *tp, struct termios *t);
  static void cx_stop (struct tty *tp, int flag);
  static void cx_receive (cx_chan_t *c, char *data, int len);
  static void cx_transmit (cx_chan_t *c, void *attachment, int len);
  static void cx_error (cx_chan_t *c, int data);
  static void cx_modem (cx_chan_t *c);
  static void cx_up (drv_t *d);
  static void cx_start (drv_t *d);
  static void cx_softintr (void *);
  static void *cx_fast_ih;
  static void cx_down (drv_t *d);
  static void cx_watchdog (drv_t *d);
  static void cx_watchdog_timer (void *arg);
  static void cx_carrier (void *arg);
  
  #ifdef NETGRAPH
  extern struct ng_type typestruct;
  #else
  static void cx_ifstart (struct ifnet *ifp);
  static void cx_tlf (struct sppp *sp);
  static void cx_tls (struct sppp *sp);
  static int cx_sioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
  static void cx_initialize (void *softc);
  #endif
  
  static cx_board_t *adapter [NCX];
  static drv_t *channel [NCX*NCHAN];
  static struct callout led_timo [NCX];
  static struct callout timeout_handle;
  
  static int cx_open (struct cdev *dev, int flag, int mode, struct thread *td);
  static int cx_close (struct cdev *dev, int flag, int mode, struct thread *td);
  static int cx_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td);
  static struct cdevsw cx_cdevsw = {
  	.d_version  = D_VERSION,
  	.d_open     = cx_open,
  	.d_close    = cx_close,
  	.d_ioctl    = cx_ioctl,
  	.d_name     = "cx",
  	.d_flags    = D_TTY,
  };
  
  static int MY_SOFT_INTR;
  
  /*
   * Make an mbuf from data.
   */
  static struct mbuf *makembuf (void *buf, u_int len)
  {
  	struct mbuf *m, *o, *p;
  
  	MGETHDR (m, M_NOWAIT, MT_DATA);
  
  	if (! m)
  		return 0;
  
  	if (len >= MINCLSIZE)
  		MCLGET (m, M_NOWAIT);
  
  	m->m_pkthdr.len = len;
  	m->m_len = 0;
  
  	p = m;
  	while (len) {
  		u_int n = M_TRAILINGSPACE (p);
  		if (n > len)
  			n = len;
  		if (! n) {
  			/* Allocate new mbuf. */
  			o = p;
  			MGET (p, M_NOWAIT, MT_DATA);
  			if (! p) {
  				m_freem (m);
  				return 0;
  			}
  			if (len >= MINCLSIZE)
  				MCLGET (p, M_NOWAIT);
  			p->m_len = 0;
  			o->m_next = p;
  
  			n = M_TRAILINGSPACE (p);
  			if (n > len)
  				n = len;
  		}
  		bcopy (buf, mtod (p, caddr_t) + p->m_len, n);
  
  		p->m_len += n;
  		buf = n + (char*) buf;
  		len -= n;
  	}
  	return m;
  }
  
  /*
   * Recover after lost transmit interrupts.
   */
  static void cx_timeout (void *arg)
  {
  	drv_t *d;
  	int s, i, k;
  
  	for (i = 0; i < NCX; i++) {
  		if (adapter[i] == NULL)
  			continue;
  		for (k = 0; k < NCHAN; ++k) {
  			d = channel[i * NCHAN + k];
  			if (! d)
  				continue;
  			s = splhigh ();
  			CX_LOCK ((bdrv_t *)d->board->sys);
  			if (d->atimeout == 1 && d->tty && d->tty->t_state & TS_BUSY) {
  				d->tty->t_state &= ~TS_BUSY;
  				if (d->tty->t_dev) {
  					d->intr_action |= CX_WRITE;
  					MY_SOFT_INTR = 1;
  					swi_sched (cx_fast_ih, 0);
  				}
  				CX_DEBUG (d, ("cx_timeout\n"));
  			}
  			if (d->atimeout)
  				d->atimeout--;
  			CX_UNLOCK ((bdrv_t *)d->board->sys);
  			splx (s);
  		}
  	}
  	callout_reset (&timeout_handle, hz*5, cx_timeout, 0);
  }
  
  static void cx_led_off (void *arg)
  {
  	cx_board_t *b = arg;
  	bdrv_t *bd = b->sys;
  	int s;
  
  	s = splhigh ();
  	CX_LOCK (bd);
  	cx_led (b, 0);
  	CX_UNLOCK (bd);
  	splx (s);
  }
  
  /*
   * Activate interrupt handler from DDK.
   */
  static void cx_intr (void *arg)
  {
  	bdrv_t *bd = arg;
  	cx_board_t *b = bd->board;
  #ifndef NETGRAPH
  	int i;
  #endif
  	int s = splhigh ();
  
  	CX_LOCK (bd);
  	/* Turn LED on. */
  	cx_led (b, 1);
  
  	cx_int_handler (b);
  
  	/* Turn LED off 50 msec later. */
  	callout_reset (&led_timo[b->num], hz/20, cx_led_off, b);
  	CX_UNLOCK (bd);
  	splx (s);
  
  #ifndef NETGRAPH
  	/* Pass packets in a lock-free state */
  	for (i = 0; i < NCHAN && b->chan[i].type; i++) {
  		drv_t *d = b->chan[i].sys;
  		struct mbuf *m;
  		if (!d || !d->running)
  			continue;
  		while (_IF_QLEN(&d->queue)) {
  			IF_DEQUEUE (&d->queue,m);
  			if (!m)
  				continue;
  			sppp_input (d->ifp, m);	
  		}
  	}
  #endif
  }
  
  static int probe_irq (cx_board_t *b, int irq)
  {
  	int mask, busy, cnt;
  
  	/* Clear pending irq, if any. */
  	cx_probe_irq (b, -irq);
  	DELAY (100);
  	for (cnt=0; cnt<5; ++cnt) {
  		/* Get the mask of pending irqs, assuming they are busy.
  		 * Activate the adapter on given irq. */
  		busy = cx_probe_irq (b, irq);
  		DELAY (100);
  
  		/* Get the mask of active irqs.
  		 * Deactivate our irq. */
  		mask = cx_probe_irq (b, -irq);
  		DELAY (100);
  		if ((mask & ~busy) == 1 << irq) {
  			cx_probe_irq (b, 0);
  			/* printf ("cx%d: irq %d ok, mask=0x%04x, busy=0x%04x\n",
  				b->num, irq, mask, busy); */
  			return 1;
  		}
  	}
  	/* printf ("cx%d: irq %d not functional, mask=0x%04x, busy=0x%04x\n",
  		b->num, irq, mask, busy); */
  	cx_probe_irq (b, 0);
  	return 0;
  }
  
  static short porttab [] = {
  	0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0,
  	0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0x3c0, 0x3e0, 0
  };
  static char dmatab [] = { 7, 6, 5, 0 };
  static char irqtab [] = { 5, 10, 11, 7, 3, 15, 12, 0 };
  
  static int cx_is_free_res (device_t dev, int rid, int type, rman_res_t start,
  	rman_res_t end, rman_res_t count)
  {
  	struct resource *res;
  	
  	if (!(res = bus_alloc_resource (dev, type, &rid, start, end, count, 0)))
  		return 0;
  		
  	bus_release_resource (dev, type, rid, res);
  	
  	return 1;
  }
  
  static void cx_identify (driver_t *driver, device_t dev)
  {
  	rman_res_t iobase, rescount;
  	int devcount;
  	device_t *devices;
  	device_t child;
  	devclass_t my_devclass;
  	int i, k;
  
  	if ((my_devclass = devclass_find ("cx")) == NULL)
  		return;
  
  	devclass_get_devices (my_devclass, &devices, &devcount);
  
  	if (devcount == 0) {
  		/* We should find all devices by our self. We could alter other
  		 * devices, but we don't have a choise
  		 */
  		for (i = 0; (iobase = porttab [i]) != 0; i++) {
  			if (!cx_is_free_res (dev, 0, SYS_RES_IOPORT,
  			    iobase, iobase + NPORT, NPORT))
  				continue;
  			if (cx_probe_board (iobase, -1, -1) == 0)
  				continue;
  			
  			devcount++;
  
  			child = BUS_ADD_CHILD (dev, ISA_ORDER_SPECULATIVE, "cx",
  			    -1);
  
  			if (child == NULL)
  				return;
  
  			device_set_desc_copy (child, "Cronyx Sigma");
  			device_set_driver (child, driver);
  			bus_set_resource (child, SYS_RES_IOPORT, 0,
  			    iobase, NPORT);
  
  			if (devcount >= NCX)
  				break;
  		}
  	} else {
  		static short porttab [] = {
  			0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0,
  			0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0x3c0, 0x3e0, 0
  		};
  		/* Lets check user choise.
  		 */
  		for (k = 0; k < devcount; k++) {
  			if (bus_get_resource (devices[k], SYS_RES_IOPORT, 0,
  			    &iobase, &rescount) != 0)
  				continue;
  
  			for (i = 0; porttab [i] != 0; i++) {
  				if (porttab [i] != iobase)
  					continue;
  				if (!cx_is_free_res (devices[k], 0, SYS_RES_IOPORT,
  				    iobase, iobase + NPORT, NPORT))
  					continue;
  				if (cx_probe_board (iobase, -1, -1) == 0)
  					continue;
  				porttab [i] = -1;
  				device_set_desc_copy (devices[k], "Cronyx Sigma");
  				break;
  			}
  
  			if (porttab [i] == 0) {
  				device_delete_child (
  				    device_get_parent (devices[k]),
  				    devices [k]);
  				devices[k] = 0;
  				continue;
  			}
  		}
  		for (k = 0; k < devcount; k++) {
  			if (devices[k] == 0)
  				continue;
  			if (bus_get_resource (devices[k], SYS_RES_IOPORT, 0,
  			    &iobase, &rescount) == 0)
  				continue;
  			for (i = 0; (iobase = porttab [i]) != 0; i++) {
  				if (porttab [i] == -1) {
  					continue;
  				}
  				if (!cx_is_free_res (devices[k], 0, SYS_RES_IOPORT,
  				    iobase, iobase + NPORT, NPORT))
  					continue;
  				if (cx_probe_board (iobase, -1, -1) == 0)
  					continue;
  			
  				bus_set_resource (devices[k], SYS_RES_IOPORT, 0,
  				    iobase, NPORT);
  				porttab [i] = -1;
  				device_set_desc_copy (devices[k], "Cronyx Sigma");
  				break;
  			}
  			if (porttab [i] == 0) {
  				device_delete_child (
  				    device_get_parent (devices[k]),
  				    devices [k]);
  			}
  		}		
  		free (devices, M_TEMP);
  	}
  	
  	return;
  }
  
  static int cx_probe (device_t dev)
  {
  	int unit = device_get_unit (dev);
  	int i;
  	rman_res_t iobase, rescount;
  
  	if (!device_get_desc (dev) ||
  	    strcmp (device_get_desc (dev), "Cronyx Sigma"))
  		return ENXIO;
  	
  	if (bus_get_resource (dev, SYS_RES_IOPORT, 0, &iobase, &rescount) != 0) {
  		printf ("cx%d: Couldn't get IOPORT\n", unit);
  		return ENXIO;
  	}
  
  	if (!cx_is_free_res (dev, 0, SYS_RES_IOPORT,
  	    iobase, iobase + NPORT, NPORT)) {
  		printf ("cx%d: Resource IOPORT isn't free %lx\n", unit, iobase);
  		return ENXIO;
  	}
  		
  	for (i = 0; porttab [i] != 0; i++) {
  		if (porttab [i] == iobase) {
  			porttab [i] = -1;
  			break;
  		}
  	}
  	
  	if (porttab [i] == 0) {
  		return ENXIO;
  	}
  	
  	if (!cx_probe_board (iobase, -1, -1)) {
  		printf ("cx%d: probing for Sigma at %lx faild\n", unit, iobase);
  		return ENXIO;
  	}
  	
  	return 0;
  }
  
  static void
  cx_bus_dmamap_addr (void *arg, bus_dma_segment_t *segs, int nseg, int error)
  {
  	unsigned long *addr;
  
  	if (error)
  		return;
  
  	KASSERT(nseg == 1, ("too many DMA segments, %d should be 1", nseg));
  	addr = arg;
  	*addr = segs->ds_addr;
  }
  
  static int
  cx_bus_dma_mem_alloc (int bnum, int cnum, cx_dma_mem_t *dmem)
  {
  	int error;
  
  	error = bus_dma_tag_create (NULL, 16, 0, BUS_SPACE_MAXADDR_24BIT,
  		BUS_SPACE_MAXADDR, NULL, NULL, dmem->size, 1,
  		dmem->size, 0, NULL, NULL, &dmem->dmat);
  	if (error) {
  		if (cnum >= 0)	printf ("cx%d-%d: ", bnum, cnum);
  		else		printf ("cx%d: ", bnum);
  		printf ("couldn't allocate tag for dma memory\n");
   		return 0;
  	}
  	error = bus_dmamem_alloc (dmem->dmat, (void **)&dmem->virt,
  		BUS_DMA_NOWAIT | BUS_DMA_ZERO, &dmem->mapp);
  	if (error) {
  		if (cnum >= 0)	printf ("cx%d-%d: ", bnum, cnum);
  		else		printf ("cx%d: ", bnum);
  		printf ("couldn't allocate mem for dma memory\n");
  		bus_dma_tag_destroy (dmem->dmat);
   		return 0;
  	}
  	error = bus_dmamap_load (dmem->dmat, dmem->mapp, dmem->virt,
  		dmem->size, cx_bus_dmamap_addr, &dmem->phys, 0);
  	if (error) {
  		if (cnum >= 0)	printf ("cx%d-%d: ", bnum, cnum);
  		else		printf ("cx%d: ", bnum);
  		printf ("couldn't load mem map for dma memory\n");
  		bus_dmamem_free (dmem->dmat, dmem->virt, dmem->mapp);
  		bus_dma_tag_destroy (dmem->dmat);
   		return 0;
  	}
  	return 1;
  }
  
  static void
  cx_bus_dma_mem_free (cx_dma_mem_t *dmem)
  {
  	bus_dmamap_unload (dmem->dmat, dmem->mapp);
  	bus_dmamem_free (dmem->dmat, dmem->virt, dmem->mapp);
  	bus_dma_tag_destroy (dmem->dmat);
  }
  
  /*
   * The adapter is present, initialize the driver structures.
   */
  static int cx_attach (device_t dev)
  {
  	bdrv_t *bd = device_get_softc (dev);
  	rman_res_t iobase, drq, irq, rescount;
  	int unit = device_get_unit (dev);
  	char *cx_ln = CX_LOCK_NAME;
  	cx_board_t *b;
  	cx_chan_t *c;
  	drv_t *d;
  	int i;
  	int s;
  
  	KASSERT ((bd != NULL), ("cx%d: NULL device softc\n", unit));
  	
  	bus_get_resource (dev, SYS_RES_IOPORT, 0, &iobase, &rescount);
  	bd->base_rid = 0;
  	bd->base_res = bus_alloc_resource (dev, SYS_RES_IOPORT, &bd->base_rid,
  		iobase, iobase + NPORT, NPORT, RF_ACTIVE);
  	if (! bd->base_res) {
  		printf ("cx%d: cannot allocate base address\n", unit);
  		return ENXIO;
  	}
  	
  	if (bus_get_resource (dev, SYS_RES_DRQ, 0, &drq, &rescount) != 0) {
  		for (i = 0; (drq = dmatab [i]) != 0; i++) {
  			if (!cx_is_free_res (dev, 0, SYS_RES_DRQ,
  			    drq, drq + 1, 1))
  				continue;
  			bus_set_resource (dev, SYS_RES_DRQ, 0, drq, 1);
  			break;
  		}
  		
  		if (dmatab[i] == 0) {	
  			bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  				bd->base_res);
  			printf ("cx%d: Couldn't get DRQ\n", unit);
  			return ENXIO;
  		}
  	}
  	
  	bd->drq_rid = 0;
  	bd->drq_res = bus_alloc_resource (dev, SYS_RES_DRQ, &bd->drq_rid,
  		drq, drq + 1, 1, RF_ACTIVE);
  	if (! bd->drq_res) {
  		printf ("cx%d: cannot allocate drq\n", unit);
  		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  			bd->base_res);
  		return ENXIO;
  	}	
  	
  	if (bus_get_resource (dev, SYS_RES_IRQ, 0, &irq, &rescount) != 0) {
  		for (i = 0; (irq = irqtab [i]) != 0; i++) {
  			if (!cx_is_free_res (dev, 0, SYS_RES_IRQ,
  			    irq, irq + 1, 1))
  				continue;
  			bus_set_resource (dev, SYS_RES_IRQ, 0, irq, 1);
  			break;
  		}
  		
  		if (irqtab[i] == 0) {	
  			bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
  				bd->drq_res);
  			bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  				bd->base_res);
  			printf ("cx%d: Couldn't get IRQ\n", unit);
  			return ENXIO;
  		}
  	}
  	
  	bd->irq_rid = 0;
  	bd->irq_res = bus_alloc_resource (dev, SYS_RES_IRQ, &bd->irq_rid,
  		irq, irq + 1, 1, RF_ACTIVE);
  	if (! bd->irq_res) {
  		printf ("cx%d: Couldn't allocate irq\n", unit);
  		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
  			bd->drq_res);
  		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  			bd->base_res);
  		return ENXIO;
  	}
  	
  	b = malloc (sizeof (cx_board_t), M_DEVBUF, M_WAITOK);
  	if (!b) {
  		printf ("cx:%d: Couldn't allocate memory\n", unit);
  		return (ENXIO);
  	}
  	adapter[unit] = b;
  	bzero (b, sizeof(cx_board_t));
  	
  	if (! cx_open_board (b, unit, iobase, irq, drq)) {
  		printf ("cx%d: error loading firmware\n", unit);
  		free (b, M_DEVBUF);
  		bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid,
  			bd->irq_res);
  		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
  			bd->drq_res);
  		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  			bd->base_res);
   		return ENXIO;
  	}
  
  	bd->board = b;
  	
  	cx_ln[2] = '0' + unit;
  	mtx_init (&bd->cx_mtx, cx_ln, MTX_NETWORK_LOCK, MTX_DEF|MTX_RECURSE);
  	if (! probe_irq (b, irq)) {
  		printf ("cx%d: irq %ld not functional\n", unit, irq);
  		bd->board = 0;
  		adapter [unit] = 0;
  		mtx_destroy (&bd->cx_mtx);
  		free (b, M_DEVBUF);
  		bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid,
  			bd->irq_res);
  		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
  			bd->drq_res);
  		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  			bd->base_res);
   		return ENXIO;
  	}
  	b->sys = bd;
  	callout_init (&led_timo[b->num], 1);
  	s = splhigh ();
  	if (bus_setup_intr (dev, bd->irq_res,
  			   INTR_TYPE_NET|INTR_MPSAFE,
  			   NULL, cx_intr, bd, &bd->intrhand)) {
  		printf ("cx%d: Can't setup irq %ld\n", unit, irq);
  		bd->board = 0;
  		b->sys = 0;
  		adapter [unit] = 0;
  		mtx_destroy (&bd->cx_mtx);
  		free (b, M_DEVBUF);
  		bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid,
  			bd->irq_res);
  		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
  			bd->drq_res);
  		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
  			bd->base_res);
  		splx (s);
   		return ENXIO;		
  	}
  	
  	CX_LOCK (bd);
  	cx_init (b, b->num, b->port, irq, drq);
  	cx_setup_board (b, 0, 0, 0);
  	CX_UNLOCK (bd);
  
  	printf ("cx%d: <Cronyx-Sigma-%s>\n", b->num, b->name);
  
  	for (c=b->chan; c<b->chan+NCHAN; ++c) {
  		if (c->type == T_NONE)
  			continue;
  		d = &bd->channel[c->num];
  		d->dmamem.size = sizeof(cx_buf_t);
  		if (! cx_bus_dma_mem_alloc (unit, c->num, &d->dmamem))
  			continue;
  		d->board = b;
  		d->chan = c;
  		d->open_dev = 0;
  		c->sys = d;
  		channel [b->num*NCHAN + c->num] = d;
  		sprintf (d->name, "cx%d.%d", b->num, c->num);
  
  		switch (c->type) {
  		case T_SYNC_RS232:
  		case T_SYNC_V35:
  		case T_SYNC_RS449:
  		case T_UNIV:
  		case T_UNIV_RS232:
  		case T_UNIV_RS449:
  		case T_UNIV_V35:
  		callout_init (&d->timeout_handle, 1);
  #ifdef NETGRAPH
  		if (ng_make_node_common (&typestruct, &d->node) != 0) {
  			printf ("%s: cannot make common node\n", d->name);
  			channel [b->num*NCHAN + c->num] = 0;
  			c->sys = 0;
  			cx_bus_dma_mem_free (&d->dmamem);
  			continue;
  		}
  		NG_NODE_SET_PRIVATE (d->node, d);
  		sprintf (d->nodename, "%s%d", NG_CX_NODE_TYPE,
  			 c->board->num*NCHAN + c->num);
  		if (ng_name_node (d->node, d->nodename)) {
  			printf ("%s: cannot name node\n", d->nodename);
  			NG_NODE_UNREF (d->node);
  			channel [b->num*NCHAN + c->num] = 0;
  			c->sys = 0;
  			cx_bus_dma_mem_free (&d->dmamem);
  			continue;
  		}
  		d->lo_queue.ifq_maxlen = ifqmaxlen;
  		d->hi_queue.ifq_maxlen = ifqmaxlen;
  		mtx_init (&d->lo_queue.ifq_mtx, "cx_queue_lo", NULL, MTX_DEF);
  		mtx_init (&d->hi_queue.ifq_mtx, "cx_queue_hi", NULL, MTX_DEF);
  #else /*NETGRAPH*/
  		d->ifp = if_alloc(IFT_PPP);
  		if (d->ifp == NULL) {
  			printf ("%s: cannot if_alloc() common interface\n",
  			    d->name);
  			channel [b->num*NCHAN + c->num] = 0;
  			c->sys = 0;
  			cx_bus_dma_mem_free (&d->dmamem);
  			continue;
  		}
  		d->ifp->if_softc	= d;
  		if_initname (d->ifp, "cx", b->num * NCHAN + c->num);
  		d->ifp->if_mtu		= PP_MTU;
  		d->ifp->if_flags	= IFF_POINTOPOINT | IFF_MULTICAST;
  		d->ifp->if_ioctl	= cx_sioctl;
  		d->ifp->if_start	= cx_ifstart;
  		d->ifp->if_init		= cx_initialize;
  		d->queue.ifq_maxlen	= 2;
  		mtx_init (&d->queue.ifq_mtx, "cx_queue", NULL, MTX_DEF);
  		sppp_attach (d->ifp);
  		if_attach (d->ifp);
  		IFP2SP(d->ifp)->pp_tlf	= cx_tlf;
  		IFP2SP(d->ifp)->pp_tls	= cx_tls;
  		/* If BPF is in the kernel, call the attach for it.
  		 * Size of PPP header is 4 bytes. */
  		bpfattach (d->ifp, DLT_PPP, 4);
  #endif /*NETGRAPH*/
  		}
  		d->tty = ttyalloc ();
  		d->tty->t_open	= cx_topen;
  		d->tty->t_close	= cx_tclose;
  		d->tty->t_param	= cx_param;
  		d->tty->t_stop	= cx_stop;
  		d->tty->t_modem	= cx_tmodem;
  		d->tty->t_oproc	= cx_oproc;
  		d->tty->t_sc	= d;
  		CX_LOCK (bd);
  		cx_start_chan (c, d->dmamem.virt, d->dmamem.phys);
  		cx_register_receive (c, &cx_receive);
  		cx_register_transmit (c, &cx_transmit);
  		cx_register_error (c, &cx_error);
  		cx_register_modem (c, &cx_modem);
  		CX_UNLOCK (bd);
  
  		ttycreate(d->tty, TS_CALLOUT, "x%r%r", b->num, c->num);
  		d->devt = make_dev (&cx_cdevsw, b->num*NCHAN + c->num + 64, UID_ROOT, GID_WHEEL, 0600, "cx%d", b->num*NCHAN + c->num);
  		d->devt->si_drv1 = d;
  		callout_init (&d->dcd_timeout_handle, 1);
  	}
  	splx (s);
  
  	gone_in_dev(dev, 13, "sync serial (T1/E1) ISA card drivers");
  	return 0;
  }
  
  static int cx_detach (device_t dev)
  {
  	bdrv_t *bd = device_get_softc (dev);
  	cx_board_t *b = bd->board;
  	cx_chan_t *c;
  	int s;
  	
  	KASSERT (mtx_initialized (&bd->cx_mtx), ("cx mutex not initialized"));
  
  	s = splhigh ();
  	CX_LOCK (bd);
  	/* Check if the device is busy (open). */
  	for (c = b->chan; c < b->chan + NCHAN; ++c) {
  		drv_t *d = (drv_t*) c->sys;
  
  		if (!d || d->chan->type == T_NONE)
  			continue;
  		if (d->lock) {
  			CX_UNLOCK (bd);
  			splx (s);
  			return EBUSY;
  		}
  		if (c->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN) &&
  		    (d->open_dev|0x2)) {
  			CX_UNLOCK (bd);
  			splx (s);
  			return EBUSY;
  		}
  		if (d->running) {
  			CX_UNLOCK (bd);
  			splx (s);
  			return EBUSY;
  		}
  	}
  
  	/* Deactivate the timeout routine. And soft interrupt*/
  	callout_stop (&led_timo[b->num]);
  
  	for (c = b->chan; c < b->chan + NCHAN; ++c) {
  		drv_t *d = c->sys;
  
  		if (!d || d->chan->type == T_NONE)
  			continue;
  
  		callout_stop (&d->dcd_timeout_handle);
  	}
  	CX_UNLOCK (bd);
  	bus_teardown_intr (dev, bd->irq_res, bd->intrhand);
  	bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid, bd->irq_res);
  	
  	bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid, bd->drq_res);
  	
  	bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid, bd->base_res);
  
  	CX_LOCK (bd);
  	cx_close_board (b);
  
  	/* Detach the interfaces, free buffer memory. */
  	for (c = b->chan; c < b->chan + NCHAN; ++c) {
  		drv_t *d = (drv_t*) c->sys;
  
  		if (!d || d->chan->type == T_NONE)
  			continue;
  			
  		if (d->tty) {
  			ttyfree (d->tty);
  			d->tty = NULL;
  		}
  
  		callout_stop (&d->timeout_handle);
  #ifdef NETGRAPH
  		if (d->node) {
  			ng_rmnode_self (d->node);
  			NG_NODE_UNREF (d->node);
  			d->node = NULL;
  		}
  		mtx_destroy (&d->lo_queue.ifq_mtx);
  		mtx_destroy (&d->hi_queue.ifq_mtx);
  #else
  		/* Detach from the packet filter list of interfaces. */
  		bpfdetach (d->ifp);
  		/* Detach from the sync PPP list. */
  		sppp_detach (d->ifp);
  
  		if_detach (d->ifp);
  		if_free(d->ifp);
  		/* XXXRIK: check interconnection with irq handler */
  		IF_DRAIN (&d->queue);
  		mtx_destroy (&d->queue.ifq_mtx);
  #endif		
  		destroy_dev (d->devt);
  	}
  
  	cx_led_off (b);
  	CX_UNLOCK (bd);
  	callout_drain (&led_timo[b->num]);
  	for (c = b->chan; c < b->chan + NCHAN; ++c) {
  		drv_t *d = c->sys;
  
  		if (!d || d->chan->type == T_NONE)
  			continue;
  
  		callout_drain (&d->dcd_timeout_handle);
  		callout_drain (&d->timeout_handle);
  	}
  	splx (s);
  	
  	s = splhigh ();
  	for (c = b->chan; c < b->chan + NCHAN; ++c) {
  		drv_t *d = (drv_t*) c->sys;
  
  		if (!d || d->chan->type == T_NONE)
  			continue;
  		
  		/* Deallocate buffers. */
  		cx_bus_dma_mem_free (&d->dmamem);
  	}
  	bd->board = NULL;
  	adapter [b->num] = NULL;
  	free (b, M_DEVBUF);
  	splx (s);
  
  	mtx_destroy (&bd->cx_mtx);
  	
  	return 0;	
  }
  
  #ifndef NETGRAPH
  static void cx_ifstart (struct ifnet *ifp)
  {
  	drv_t *d = ifp->if_softc;
  	bdrv_t *bd = d->board->sys;
  
  	CX_LOCK (bd);
  	cx_start (d);
  	CX_UNLOCK (bd);
  }
  
  static void cx_tlf (struct sppp *sp)
  {
  	drv_t *d = SP2IFP(sp)->if_softc;
  
  	CX_DEBUG (d, ("cx_tlf\n"));
  /*	cx_set_dtr (d->chan, 0);*/
  /*	cx_set_rts (d->chan, 0);*/
  	if (!(IFP2SP(d->ifp)->pp_flags & PP_FR) && !(d->ifp->if_flags & PP_CISCO))
  		sp->pp_down (sp);
  }
  
  static void cx_tls (struct sppp *sp)
  {
  	drv_t *d = SP2IFP(sp)->if_softc;
  
  	CX_DEBUG (d, ("cx_tls\n"));
  	if (!(IFP2SP(d->ifp)->pp_flags & PP_FR) && !(d->ifp->if_flags & PP_CISCO))
  		sp->pp_up (sp);
  }
  
  /*
   * Initialization of interface.
   * It seems to be never called by upper level.
   */
  static void cx_initialize (void *softc)
  {
  	drv_t *d = softc;
  
  	CX_DEBUG (d, ("cx_initialize\n"));
  }
  
  /*
   * Process an ioctl request.
   */
  static int cx_sioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
  {
  	drv_t *d = ifp->if_softc;
  	bdrv_t *bd = d->board->sys;
  	int error, s, was_up, should_be_up;
  
  	/* No socket ioctls while the channel is in async mode. */
  	if (d->chan->type == T_NONE || d->chan->mode == M_ASYNC)
  		return EBUSY;
  
  	/* Socket ioctls on slave subchannels are not allowed. */
  	was_up = (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0;
  	error = sppp_ioctl (ifp, cmd, data);
  	if (error)
  		return error;
  
  	s = splhigh ();
  	CX_LOCK (bd);
  	if (! (ifp->if_flags & IFF_DEBUG))
  		d->chan->debug = 0;
  	else
  		d->chan->debug = d->chan->debug_shadow;
  	CX_UNLOCK (bd);
  	splx (s);
  
  	switch (cmd) {
  	default:	   CX_DEBUG2 (d, ("ioctl 0x%lx\n", cmd)); return 0;
  	case SIOCADDMULTI: CX_DEBUG2 (d, ("SIOCADDMULTI\n"));     return 0;
  	case SIOCDELMULTI: CX_DEBUG2 (d, ("SIOCDELMULTI\n"));     return 0;
  	case SIOCSIFFLAGS: CX_DEBUG2 (d, ("SIOCSIFFLAGS\n"));     break;
  	case SIOCSIFADDR:  CX_DEBUG2 (d, ("SIOCSIFADDR\n"));      break;
  	}
  
  	/* We get here only in case of SIFFLAGS or SIFADDR. */
  	s = splhigh ();
  	CX_LOCK (bd);
  	should_be_up = (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0;
  	if (!was_up && should_be_up) {
  		/* Interface goes up -- start it. */
  		cx_up (d);
  		cx_start (d);
  	} else if (was_up && !should_be_up) {
  		/* Interface is going down -- stop it. */
  		/* if ((IFP2SP(d->ifp)->pp_flags & PP_FR) || (ifp->if_flags & PP_CISCO))*/
  		cx_down (d);
  	}
  	CX_UNLOCK (bd);
  	splx (s);
  	return 0;
  }
  #endif /*NETGRAPH*/
  
  /*
   * Stop the interface.  Called on splimp().
   */
  static void cx_down (drv_t *d)
  {
  	int s = splhigh ();
  	CX_DEBUG (d, ("cx_down\n"));
  	cx_set_dtr (d->chan, 0);
  	cx_set_rts (d->chan, 0);
  	d->running = 0;
  	callout_stop (&d->timeout_handle);
  	splx (s);
  }
  
  /*
   * Start the interface.  Called on splimp().
   */
  static void cx_up (drv_t *d)
  {
  	int s = splhigh ();
  	CX_DEBUG (d, ("cx_up\n"));
  	cx_set_dtr (d->chan, 1);
  	cx_set_rts (d->chan, 1);
  	d->running = 1;
  	splx (s);
  }
  
  /*
   * Start output on the (slave) interface.  Get another datagram to send
   * off of the interface queue, and copy it to the interface
   * before starting the output.
   */
  static void cx_send (drv_t *d)
  {
  	struct mbuf *m;
  	u_short len;
  
  	CX_DEBUG2 (d, ("cx_send\n"));
  
  	/* No output if the interface is down. */
  	if (! d->running)
  		return;
  
  	/* No output if the modem is off. */
  	if (! cx_get_dsr (d->chan) && ! cx_get_loop(d->chan))
  		return;
  
  	if (cx_buf_free (d->chan)) {
  		/* Get the packet to send. */
  #ifdef NETGRAPH
  		IF_DEQUEUE (&d->hi_queue, m);
  		if (! m)
  			IF_DEQUEUE (&d->lo_queue, m);
  #else
  		m = sppp_dequeue (d->ifp);
  #endif
  		if (! m)
  			return;
  #ifndef NETGRAPH
  		BPF_MTAP (d->ifp, m);
  #endif
  		len = m_length (m, NULL);
  		if (! m->m_next)
  			cx_send_packet (d->chan, (u_char*)mtod (m, caddr_t),
  				len, 0);
  		else {
  			u_char buf [DMABUFSZ];
  			m_copydata (m, 0, len, buf);
  			cx_send_packet (d->chan, buf, len, 0);
  		}
  		m_freem (m);
  
  		/* Set up transmit timeout, 10 seconds. */
  		d->timeout = 10;
  	}
  #ifndef NETGRAPH
  	d->ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  #endif
  }
  
  /*
   * Start output on the interface.
   * Always called on splimp().
   */
  static void cx_start (drv_t *d)
  {
  	int s = splhigh ();
  	if (d->running) {
  		if (! d->chan->dtr)
  			cx_set_dtr (d->chan, 1);
  		if (! d->chan->rts)
  			cx_set_rts (d->chan, 1);
  		cx_send (d);
  		callout_reset (&d->timeout_handle, hz, cx_watchdog_timer, d);
  	}
  	splx (s);
  }
  
  /*
   * Handle transmit timeouts.
   * Recover after lost transmit interrupts.
   * Always called on splimp().
   */
  static void cx_watchdog (drv_t *d)
  {
  	
  	CX_DEBUG (d, ("device timeout\n"));
  	if (d->running) {
  		cx_setup_chan (d->chan);
  		cx_start_chan (d->chan, 0, 0);
  		cx_set_dtr (d->chan, 1);
  		cx_set_rts (d->chan, 1);
  		cx_start (d);
  	}
  }
  
  static void cx_watchdog_timer (void *arg)
  {
  	drv_t *d = arg;
  	bdrv_t *bd = d->board->sys;
  
  	CX_LOCK (bd);
  	if (d->timeout == 1)
  		cx_watchdog (d);
  	if (d->timeout)
  		d->timeout--;
  	callout_reset (&d->timeout_handle, hz, cx_watchdog_timer, d);
  	CX_UNLOCK (bd);
  }
  
  /*
   * Transmit callback function.
   */
  static void cx_transmit (cx_chan_t *c, void *attachment, int len)
  {
  	drv_t *d = c->sys;
  
  	if (!d)
  		return;
  		
  	if (c->mode == M_ASYNC && d->tty) {
  		d->tty->t_state &= ~(TS_BUSY | TS_FLUSH);
  		d->atimeout = 0;
  		if (d->tty->t_dev) {
  			d->intr_action |= CX_WRITE;
  			MY_SOFT_INTR = 1;
  			swi_sched (cx_fast_ih, 0);
  		}
  		return;
  	}
  	d->timeout = 0;
  #ifndef NETGRAPH
  	if_inc_counter(d->ifp, IFCOUNTER_OPACKETS, 1);
  	d->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  #endif
  	cx_start (d);
  }
  
  /*
   * Process the received packet.
   */
  static void cx_receive (cx_chan_t *c, char *data, int len)
  {
  	drv_t *d = c->sys;
  	struct mbuf *m;
  	char *cc = data;
  #ifdef NETGRAPH
  	int error;
  #endif
  
  	if (!d)
  		return;
  		
  	if (c->mode == M_ASYNC && d->tty) {
  		if (d->tty->t_state & TS_ISOPEN) {
  			async_q *q = &d->aqueue;
  			int size = BF_SZ - 1 - AQ_GSZ (q);
  
  			if (len <= 0 && !size)
  				return;
  
  			if (len > size) {
  				c->ierrs++;
  				cx_error (c, CX_OVERRUN);
  				len = size - 1;
  			}
  
  			while (len--) {
  				AQ_PUSH (q, *(unsigned char *)cc);
  				cc++;
  			}
  
  			d->intr_action |= CX_READ;
  			MY_SOFT_INTR = 1;
  			swi_sched (cx_fast_ih, 0);
  		}
  		return;
  	}
  	if (! d->running)
  		return;
  
  	m = makembuf (data, len);
  	if (! m) {
  		CX_DEBUG (d, ("no memory for packet\n"));
  #ifndef NETGRAPH
  		if_inc_counter(d->ifp, IFCOUNTER_IQDROPS, 1);
  #endif
  		return;
  	}
  	if (c->debug > 1)
  		m_print (m, 0);
  #ifdef NETGRAPH
  	m->m_pkthdr.rcvif = 0;
  	NG_SEND_DATA_ONLY (error, d->hook, m);
  #else
  	if_inc_counter(d->ifp, IFCOUNTER_IPACKETS, 1);
  	m->m_pkthdr.rcvif = d->ifp;
  	/* Check if there's a BPF listener on this interface.
  	 * If so, hand off the raw packet to bpf. */
  	BPF_MTAP(d->ifp, m);
  	IF_ENQUEUE (&d->queue, m);
  #endif
  }
  
  #define CONDITION(t,tp) (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))\
  	    && (!(tp->t_iflag & BRKINT) || (tp->t_iflag & IGNBRK))\
  	    && (!(tp->t_iflag & PARMRK)\
  		|| (tp->t_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))\
  	    && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))\
  	    && linesw[tp->t_line]->l_rint == ttyinput)
  
  /*
   * Error callback function.
   */
  static void cx_error (cx_chan_t *c, int data)
  {
  	drv_t *d = c->sys;
  	async_q *q;
  
  	if (!d)
  		return;
  
  	q = &(d->aqueue);
  
  	switch (data) {
  	case CX_FRAME:
  		CX_DEBUG (d, ("frame error\n"));
  		if (c->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN)
  			&& (AQ_GSZ (q) < BF_SZ - 1)
  			&& (!CONDITION((&d->tty->t_termios), (d->tty))
  			|| !(d->tty->t_iflag & (IGNPAR | PARMRK)))) {
  			AQ_PUSH (q, TTY_FE);
  			d->intr_action |= CX_READ;
  			MY_SOFT_INTR = 1;
  			swi_sched (cx_fast_ih, 0);
  		}
  #ifndef NETGRAPH
  		else
  			if_inc_counter(d->ifp, IFCOUNTER_IERRORS, 1);
  #endif
  		break;
  	case CX_CRC:
  		CX_DEBUG (d, ("crc error\n"));
  		if (c->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN)
  			&& (AQ_GSZ (q) < BF_SZ - 1)
  			&& (!CONDITION((&d->tty->t_termios), (d->tty))
  			|| !(d->tty->t_iflag & INPCK)
  			|| !(d->tty->t_iflag & (IGNPAR | PARMRK)))) {
  			AQ_PUSH (q, TTY_PE);
  			d->intr_action |= CX_READ;
  			MY_SOFT_INTR = 1;
  			swi_sched (cx_fast_ih, 0);
  		}
  #ifndef NETGRAPH
  		else
  			if_inc_counter(d->ifp, IFCOUNTER_IERRORS, 1);
  #endif
  		break;
  	case CX_OVERRUN:
  		CX_DEBUG (d, ("overrun error\n"));
  #ifdef TTY_OE
  		if (c->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN)
  			&& (AQ_GSZ (q) < BF_SZ - 1)
  			&& (!CONDITION((&d->tty->t_termios), (d->tty)))) {
  			AQ_PUSH (q, TTY_OE);
  			d->intr_action |= CX_READ;
  			MY_SOFT_INTR = 1;
  			swi_sched (cx_fast_ih, 0);
  		}
  #endif
  #ifndef NETGRAPH
  		else {
  			if_inc_counter(d->ifp, IFCOUNTER_COLLISIONS, 1);
  			if_inc_counter(d->ifp, IFCOUNTER_IERRORS, 1);
  		}
  #endif
  		break;
  	case CX_OVERFLOW:
  		CX_DEBUG (d, ("overflow error\n"));
  #ifndef NETGRAPH
  		if (c->mode != M_ASYNC)
  			if_inc_counter(d->ifp, IFCOUNTER_IERRORS, 1);
  #endif
  		break;
  	case CX_UNDERRUN:
  		CX_DEBUG (d, ("underrun error\n"));
  		if (c->mode != M_ASYNC) {
  			d->timeout = 0;
  #ifndef NETGRAPH
  			if_inc_counter(d->ifp, IFCOUNTER_OERRORS, 1);
  			d->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  #endif
  			cx_start (d);
  		}
  		break;
  	case CX_BREAK:
  		CX_DEBUG (d, ("break error\n"));
  		if (c->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN)
  			&& (AQ_GSZ (q) < BF_SZ - 1)
  			&& (!CONDITION((&d->tty->t_termios), (d->tty))
  			|| !(d->tty->t_iflag & (IGNBRK | BRKINT | PARMRK)))) {
  			AQ_PUSH (q, TTY_BI);
  			d->intr_action |= CX_READ;
  			MY_SOFT_INTR = 1;
  			swi_sched (cx_fast_ih, 0);
  		}
  #ifndef NETGRAPH
  		else
  			if_inc_counter(d->ifp, IFCOUNTER_IERRORS, 1);
  #endif
  		break;
  	default:
  		CX_DEBUG (d, ("error #%d\n", data));
  	}
  }
  
  static int cx_topen (struct tty *tp, struct cdev *dev)
  {
  	bdrv_t *bd;
  	drv_t *d;
  
  	d = tp->t_sc;
  	CX_DEBUG2 (d, ("cx_open (serial)\n"));
  
  	bd = d->board->sys;
  
  	if (d->chan->mode != M_ASYNC)
  		return (EBUSY);
  
  	d->open_dev |= 0x2;
  	CX_LOCK (bd);
  	cx_start_chan (d->chan, 0, 0);
  	cx_set_dtr (d->chan, 1);
  	cx_set_rts (d->chan, 1);
  	d->cd = cx_get_cd (d->chan);
  	CX_UNLOCK (bd);
  
  	CX_DEBUG2 (d, ("cx_open done\n"));
  
  	return 0;
  }
  
  static void cx_tclose (struct tty *tp)
  {
  	drv_t *d;
  	bdrv_t *bd;
  
  	d = tp->t_sc;
  	CX_DEBUG2 (d, ("cx_close\n"));
  	bd = d->board->sys;
  	CX_LOCK (bd);
  	/* Disable receiver.
  	 * Transmitter continues sending the queued data. */
  	cx_enable_receive (d->chan, 0);
  	CX_UNLOCK (bd);
  	d->open_dev &= ~0x2;
  }
  
  static int cx_tmodem (struct tty *tp, int sigon, int sigoff)
  {
  	drv_t *d;
  	bdrv_t *bd;
  
  	d = tp->t_sc;
  	bd = d->board->sys;
  
  	CX_LOCK (bd);
  	if (!sigon && !sigoff) {
  		if (cx_get_dsr (d->chan)) sigon |= SER_DSR;
  		if (cx_get_cd  (d->chan)) sigon |= SER_DCD;
  		if (cx_get_cts (d->chan)) sigon |= SER_CTS;
  		if (d->chan->dtr)	  sigon |= SER_DTR;
  		if (d->chan->rts)	  sigon |= SER_RTS;
  		CX_UNLOCK (bd);
  		return sigon;
  	}
  
  	if (sigon & SER_DTR)
  		cx_set_dtr (d->chan, 1);
  	if (sigoff & SER_DTR)
  		cx_set_dtr (d->chan, 0);
  	if (sigon & SER_RTS)
  		cx_set_rts (d->chan, 1);
  	if (sigoff & SER_RTS)
  		cx_set_rts (d->chan, 0);
  	CX_UNLOCK (bd);
  
  	return (0);
  }
  
  static int cx_open (struct cdev *dev, int flag, int mode, struct thread *td)
  {
  	int unit;
  	drv_t *d;
  
  	d = dev->si_drv1;
  	unit = d->chan->num;
  
  	CX_DEBUG2 (d, ("cx_open unit=%d, flag=0x%x, mode=0x%x\n",
  		    unit, flag, mode));
  
  	d->open_dev |= 0x1;
  
  	CX_DEBUG2 (d, ("cx_open done\n"));
  
  	return 0;
  }
  
  static int cx_close (struct cdev *dev, int flag, int mode, struct thread *td)
  {
  	drv_t *d;
  
  	d = dev->si_drv1;
  	CX_DEBUG2 (d, ("cx_close\n"));
  	d->open_dev &= ~0x1;
  	return 0;
  }
  
  static int cx_modem_status (drv_t *d)
  {
  	bdrv_t *bd = d->board->sys;
  	int status = 0, s = splhigh ();
  	CX_LOCK (bd);
  	/* Already opened by someone or network interface is up? */
  	if ((d->chan->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN) &&
  	    (d->open_dev|0x2)) || (d->chan->mode != M_ASYNC && d->running))
  		status = TIOCM_LE;	/* always enabled while open */
  
  	if (cx_get_dsr (d->chan)) status |= TIOCM_DSR;
  	if (cx_get_cd  (d->chan)) status |= TIOCM_CD;
  	if (cx_get_cts (d->chan)) status |= TIOCM_CTS;
  	if (d->chan->dtr)	  status |= TIOCM_DTR;
  	if (d->chan->rts)	  status |= TIOCM_RTS;
  	CX_UNLOCK (bd);
  	splx (s);
  	return status;
  }
  
  static int cx_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
  {
  	drv_t *d;
  	bdrv_t *bd;
  	cx_chan_t *c;
  	struct serial_statistics *st;
  	int error, s;
  	char mask[16];
  
  	d = dev->si_drv1;
  	c = d->chan;
  		
  	bd = d->board->sys;
  	
  	switch (cmd) {
  	case SERIAL_GETREGISTERED:
  		CX_DEBUG2 (d, ("ioctl: getregistered\n"));
  		bzero (mask, sizeof(mask));
  		for (s=0; s<NCX*NCHAN; ++s)
  			if (channel [s])
  				mask [s/8] |= 1 << (s & 7);
  		bcopy (mask, data, sizeof (mask));
  		return 0;
  
  	case SERIAL_GETPORT:
  		CX_DEBUG2 (d, ("ioctl: getport\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int *)data = cx_get_port (c);
  		CX_UNLOCK (bd);
  		splx (s);
  		if (*(int *)data<0)
  			return (EINVAL);
  		else
  			return 0;
  
  	case SERIAL_SETPORT:
  		CX_DEBUG2 (d, ("ioctl: setproto\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_port (c, *(int *)data);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  #ifndef NETGRAPH
  	case SERIAL_GETPROTO:
  		CX_DEBUG2 (d, ("ioctl: getproto\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		strcpy ((char*)data, (c->mode == M_ASYNC) ? "async" :
  			(IFP2SP(d->ifp)->pp_flags & PP_FR) ? "fr" :
  			(d->ifp->if_flags & PP_CISCO) ? "cisco" : "ppp");
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETPROTO:
  		CX_DEBUG2 (d, ("ioctl: setproto\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		if (c->mode == M_ASYNC)
  			return EBUSY;
  		if (d->ifp->if_drv_flags & IFF_DRV_RUNNING)
  			return EBUSY;
  		if (! strcmp ("cisco", (char*)data)) {
  			IFP2SP(d->ifp)->pp_flags &= ~(PP_FR);
  			IFP2SP(d->ifp)->pp_flags |= PP_KEEPALIVE;
  			d->ifp->if_flags |= PP_CISCO;
  		} else if (! strcmp ("fr", (char*)data)) {
  			d->ifp->if_flags &= ~(PP_CISCO);
  			IFP2SP(d->ifp)->pp_flags |= PP_FR | PP_KEEPALIVE;
  		} else if (! strcmp ("ppp", (char*)data)) {
  			IFP2SP(d->ifp)->pp_flags &= ~(PP_FR | PP_KEEPALIVE);
  			d->ifp->if_flags &= ~(PP_CISCO);
  		} else
  			return EINVAL;
  		return 0;
  
  	case SERIAL_GETKEEPALIVE:
  		CX_DEBUG2 (d, ("ioctl: getkeepalive\n"));
  		if ((IFP2SP(d->ifp)->pp_flags & PP_FR) ||
  		    (d->ifp->if_flags & PP_CISCO) ||
  		    (c->mode == M_ASYNC))
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int*)data = (IFP2SP(d->ifp)->pp_flags & PP_KEEPALIVE) ? 1 : 0;
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETKEEPALIVE:
  		CX_DEBUG2 (d, ("ioctl: setkeepalive\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		if ((IFP2SP(d->ifp)->pp_flags & PP_FR) ||
  			(d->ifp->if_flags & PP_CISCO))
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		if (*(int*)data)
  			IFP2SP(d->ifp)->pp_flags |= PP_KEEPALIVE;
  		else
  			IFP2SP(d->ifp)->pp_flags &= ~PP_KEEPALIVE;
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  #endif /*NETGRAPH*/
  
  	case SERIAL_GETMODE:
  		CX_DEBUG2 (d, ("ioctl: getmode\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int*)data = (c->mode == M_ASYNC) ?
  			SERIAL_ASYNC : SERIAL_HDLC;
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETMODE:
  		CX_DEBUG2 (d, ("ioctl: setmode\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  
  		/* Somebody is waiting for carrier? */
  		if (d->lock)
  			return EBUSY;
  		/* /dev/ttyXX is already opened by someone? */
  		if (c->mode == M_ASYNC && d->tty && (d->tty->t_state & TS_ISOPEN) &&
  		    (d->open_dev|0x2))
  			return EBUSY;
  		/* Network interface is up?
  		 * Cannot change to async mode. */
  		if (c->mode != M_ASYNC && d->running &&
  		    (*(int*)data == SERIAL_ASYNC))
  			return EBUSY;
  
  		s = splhigh ();
  		CX_LOCK (bd);
  		if (c->mode == M_HDLC && *(int*)data == SERIAL_ASYNC) {
  			cx_set_mode (c, M_ASYNC);
  			cx_enable_receive (c, 0);
  			cx_enable_transmit (c, 0);
  		} else if (c->mode == M_ASYNC && *(int*)data == SERIAL_HDLC) {
  			if (d->ifp->if_flags & IFF_DEBUG)
  				c->debug = c->debug_shadow;
  			cx_set_mode (c, M_HDLC);
  			cx_enable_receive (c, 1);
  			cx_enable_transmit (c, 1);
  		}
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_GETSTAT:
  		CX_DEBUG2 (d, ("ioctl: getestat\n"));
  		st = (struct serial_statistics*) data;
  		s = splhigh ();
  		CX_LOCK (bd);
  		st->rintr  = c->rintr;
  		st->tintr  = c->tintr;
  		st->mintr  = c->mintr;
  		st->ibytes = c->ibytes;
  		st->ipkts  = c->ipkts;
  		st->ierrs  = c->ierrs;
  		st->obytes = c->obytes;
  		st->opkts  = c->opkts;
  		st->oerrs  = c->oerrs;
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_CLRSTAT:
  		CX_DEBUG2 (d, ("ioctl: clrstat\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		s = splhigh ();
  		CX_LOCK (bd);
  		c->rintr = 0;
  		c->tintr = 0;
  		c->mintr = 0;
  		c->ibytes = 0;
  		c->ipkts = 0;
  		c->ierrs = 0;
  		c->obytes = 0;
  		c->opkts = 0;
  		c->oerrs = 0;
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_GETBAUD:
  		CX_DEBUG2 (d, ("ioctl: getbaud\n"));
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(long*)data = cx_get_baud(c);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETBAUD:
  		CX_DEBUG2 (d, ("ioctl: setbaud\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_baud (c, *(long*)data);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_GETLOOP:
  		CX_DEBUG2 (d, ("ioctl: getloop\n"));
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int*)data = cx_get_loop (c);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETLOOP:
  		CX_DEBUG2 (d, ("ioctl: setloop\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_loop (c, *(int*)data);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_GETDPLL:
  		CX_DEBUG2 (d, ("ioctl: getdpll\n"));
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int*)data = cx_get_dpll (c);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETDPLL:
  		CX_DEBUG2 (d, ("ioctl: setdpll\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_dpll (c, *(int*)data);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_GETNRZI:
  		CX_DEBUG2 (d, ("ioctl: getnrzi\n"));
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int*)data = cx_get_nrzi (c);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETNRZI:
  		CX_DEBUG2 (d, ("ioctl: setnrzi\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		if (c->mode == M_ASYNC)
  			return EINVAL;
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_nrzi (c, *(int*)data);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_GETDEBUG:
  		CX_DEBUG2 (d, ("ioctl: getdebug\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		*(int*)data = c->debug;
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case SERIAL_SETDEBUG:
  		CX_DEBUG2 (d, ("ioctl: setdebug\n"));
  		/* Only for superuser! */
  		error = priv_check (td, PRIV_DRIVER);
  		if (error)
  			return error;
  		s = splhigh ();
  		CX_LOCK (bd);
  #ifndef	NETGRAPH
  		if (c->mode == M_ASYNC) {
  			c->debug = *(int*)data;
  		} else {
  			/*
  			 * The debug_shadow is always greater than zero for
  			 * logic simplicity.  For switching debug off the
  			 * IFF_DEBUG is responsible (for !M_ASYNC mode).
  			 */
  			c->debug_shadow = (*(int*)data) ? (*(int*)data) : 1;
  			if (d->ifp->if_flags & IFF_DEBUG)
  				c->debug = c->debug_shadow;
  		}
  #else
  		c->debug = *(int*)data;
  #endif
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  	}
  
  	switch (cmd) {
  	case TIOCSDTR:	/* Set DTR */
  		CX_DEBUG2 (d, ("ioctl: tiocsdtr\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_dtr (c, 1);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case TIOCCDTR:	/* Clear DTR */
  		CX_DEBUG2 (d, ("ioctl: tioccdtr\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_dtr (c, 0);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case TIOCMSET:	/* Set DTR/RTS */
  		CX_DEBUG2 (d, ("ioctl: tiocmset\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		cx_set_dtr (c, (*(int*)data & TIOCM_DTR) ? 1 : 0);
  		cx_set_rts (c, (*(int*)data & TIOCM_RTS) ? 1 : 0);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case TIOCMBIS:	/* Add DTR/RTS */
  		CX_DEBUG2 (d, ("ioctl: tiocmbis\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		if (*(int*)data & TIOCM_DTR) cx_set_dtr (c, 1);
  		if (*(int*)data & TIOCM_RTS) cx_set_rts (c, 1);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case TIOCMBIC:	/* Clear DTR/RTS */
  		CX_DEBUG2 (d, ("ioctl: tiocmbic\n"));
  		s = splhigh ();
  		CX_LOCK (bd);
  		if (*(int*)data & TIOCM_DTR) cx_set_dtr (c, 0);
  		if (*(int*)data & TIOCM_RTS) cx_set_rts (c, 0);
  		CX_UNLOCK (bd);
  		splx (s);
  		return 0;
  
  	case TIOCMGET:	/* Get modem status */
  		CX_DEBUG2 (d, ("ioctl: tiocmget\n"));
  		*(int*)data = cx_modem_status (d);
  		return 0;
  
  	}
  
  	CX_DEBUG2 (d, ("ioctl: 0x%lx\n", cmd));
  	return ENOTTY;
  }
  
  void cx_softintr (void *unused)
  {
  	drv_t *d;
  	bdrv_t *bd;
  	async_q *q;
  	int i, s, ic, k;
  	while (MY_SOFT_INTR) {
  		MY_SOFT_INTR = 0;
  		for (i=0; i<NCX*NCHAN; ++i) {
  			d = channel [i];
  			if (!d || !d->chan || d->chan->type == T_NONE
  			    || d->chan->mode != M_ASYNC || !d->tty
  			    || !d->tty->t_dev)
  				continue;
  			bd = d->board->sys;
  			s = splhigh ();
  			CX_LOCK (bd);
  			if (d->intr_action & CX_READ) {
  				q = &(d->aqueue);
  				if (d->tty->t_state & TS_CAN_BYPASS_L_RINT) {
  					k = AQ_GSZ(q);
  					if (d->tty->t_rawq.c_cc + k >
  						d->tty->t_ihiwat
  					    && (d->tty->t_cflag & CRTS_IFLOW
  						|| d->tty->t_iflag & IXOFF)
  					    && !(d->tty->t_state & TS_TBLOCK))
  						ttyblock(d->tty);
  					d->tty->t_rawcc += k;
  					while (k>0) {
  						k--;
  						AQ_POP (q, ic);
  						CX_UNLOCK (bd);
  						splx (s);
  						putc (ic, &d->tty->t_rawq);
  						s = splhigh ();
  						CX_LOCK (bd);
  					}
  					ttwakeup(d->tty);
  					if (d->tty->t_state & TS_TTSTOP
  					    && (d->tty->t_iflag & IXANY
  						|| d->tty->t_cc[VSTART] ==
  						d->tty->t_cc[VSTOP])) {
  						d->tty->t_state &= ~TS_TTSTOP;
  						d->tty->t_lflag &= ~FLUSHO;
  						d->intr_action |= CX_WRITE;
  					}
  				} else {
  					while (q->end != q->beg) {
  						AQ_POP (q, ic);
  						CX_UNLOCK (bd);
  						splx (s);
  						ttyld_rint (d->tty, ic);
  						s = splhigh ();
  						CX_LOCK (bd);
  					}
  				}
  				d->intr_action &= ~CX_READ;
  			}
  			splx (s);
  			CX_UNLOCK (bd);
  
  			s = splhigh ();
  			CX_LOCK (bd);
  			if (d->intr_action & CX_WRITE) {
  				if (d->tty->t_line)
  					ttyld_start (d->tty);
  				else
  					cx_oproc (d->tty);
  				d->intr_action &= ~CX_WRITE;
  			}
  			CX_UNLOCK (bd);
  			splx (s);
  
  		}
  	}
  }
  
  /*
   * Fill transmitter buffer with data.
   */
  static void cx_oproc (struct tty *tp)
  {
  	int s, k;
  	drv_t *d;
  	bdrv_t *bd;
  	static u_char buf[DMABUFSZ];
  	u_char *p;
  	u_short len = 0, sublen = 0;
  
  	d = tp->t_sc;
  	bd = d->board->sys;
  
  	CX_DEBUG2 (d, ("cx_oproc\n"));
  
  	s = splhigh ();
  	CX_LOCK (bd);
  
  	if (tp->t_cflag & CRTSCTS && (tp->t_state & TS_TBLOCK) && d->chan->rts)
  		cx_set_rts (d->chan, 0);
  	else if (tp->t_cflag & CRTSCTS && ! (tp->t_state & TS_TBLOCK) && ! d->chan->rts)
  		cx_set_rts (d->chan, 1);
  
  	if (! (tp->t_state & (TS_TIMEOUT | TS_TTSTOP))) {
  		/* Start transmitter. */
  		cx_enable_transmit (d->chan, 1);
  
  		/* Is it busy? */
  		if (! cx_buf_free (d->chan)) {
  			tp->t_state |= TS_BUSY;
  			CX_UNLOCK (bd);
  			splx (s);
  			return;
  		}
  		if (tp->t_iflag & IXOFF) {
  			p = (buf + (DMABUFSZ/2));
  			sublen = q_to_b (&tp->t_outq, p, (DMABUFSZ/2));
  			k = sublen;
  			while (k--) {
  				/* Send XON/XOFF out of band. */
  				if (*p == tp->t_cc[VSTOP]) {
  					cx_xflow_ctl (d->chan, 0);
  					p++;
  					continue;
  				}
  				if (*p == tp->t_cc[VSTART]) {
  					cx_xflow_ctl (d->chan, 1);
  					p++;
  					continue;
  				}
  				buf[len] = *p;
  				len++;
  				p++;
  			}
  		} else {
  			p = buf;
  			len = q_to_b (&tp->t_outq, p, (DMABUFSZ/2));
  		}
  		if (len) {
  			cx_send_packet (d->chan, buf, len, 0);
  			tp->t_state |= TS_BUSY;
  			d->atimeout = 10;
  			CX_DEBUG2 (d, ("out %d bytes\n", len));
  		}
  	}
  	ttwwakeup (tp);
  	CX_UNLOCK (bd);
  	splx (s);
  }
  
  static int cx_param (struct tty *tp, struct termios *t)
  {
  	drv_t *d;
  	bdrv_t *bd;
  	int s, bits, parity;
  
  	d = tp->t_sc;
  	bd = d->board->sys;
  	
  	s = splhigh ();
  	CX_LOCK (bd);
  	if (t->c_ospeed == 0) {
  		/* Clear DTR and RTS. */
  		cx_set_dtr (d->chan, 0);
  		CX_UNLOCK (bd);
  		splx (s);
  		CX_DEBUG2 (d, ("cx_param (hangup)\n"));
  		return 0;
  	}
  	CX_DEBUG2 (d, ("cx_param\n"));
  
  	/* Check requested parameters. */
  	if (t->c_ospeed < 300 || t->c_ospeed > 256*1024) {
  		CX_UNLOCK (bd);
  		splx (s);
  		return EINVAL;
  	}
  	if (t->c_ispeed && (t->c_ispeed < 300 || t->c_ispeed > 256*1024)) {
  		CX_UNLOCK (bd);
  		splx (s);
  		return EINVAL;
  	}
  
    	/* And copy them to tty and channel structures. */
  	tp->t_ispeed = t->c_ispeed = tp->t_ospeed = t->c_ospeed;
  	tp->t_cflag = t->c_cflag;
  
  	/* Set character length and parity mode. */
  	switch (t->c_cflag & CSIZE) {
  	default:
  	case CS8: bits = 8; break;
  	case CS7: bits = 7; break;
  	case CS6: bits = 6; break;
  	case CS5: bits = 5; break;
  	}
  
  	parity = ((t->c_cflag & PARENB) ? 1 : 0) *
  		 (1 + ((t->c_cflag & PARODD) ? 0 : 1));
  
  	/* Set current channel number. */
  	if (! d->chan->dtr)
  		cx_set_dtr (d->chan, 1);
  
  	ttyldoptim (tp);
  	cx_set_async_param (d->chan, t->c_ospeed, bits, parity, (t->c_cflag & CSTOPB),
  		!(t->c_cflag & PARENB), (t->c_cflag & CRTSCTS),
  		(t->c_iflag & IXON), (t->c_iflag & IXANY),
  		t->c_cc[VSTART], t->c_cc[VSTOP]);
  	CX_UNLOCK (bd);
  	splx (s);
  	return 0;
  }
  
  /*
   * Stop output on a line
   */
  static void cx_stop (struct tty *tp, int flag)
  {
  	drv_t *d;
  	bdrv_t *bd;
  	int s;
  
  	d = tp->t_sc;
  	bd = d->board->sys;
  	
  	s = splhigh ();
  	CX_LOCK (bd);
  	if (tp->t_state & TS_BUSY) {
  		/* Stop transmitter */
  		CX_DEBUG2 (d, ("cx_stop\n"));
  		cx_transmitter_ctl (d->chan, 0);
  	}
  	CX_UNLOCK (bd);
  	splx (s);
  }
  
  /*
   * Process the (delayed) carrier signal setup.
   */
  static void cx_carrier (void *arg)
  {
  	drv_t *d = arg;
  	bdrv_t *bd = d->board->sys;
  	cx_chan_t *c = d->chan;
  	int s, cd;
  
  	s = splhigh ();
  	CX_LOCK (bd);
  	cd = cx_get_cd (c);
  	if (d->cd != cd) {
  		if (cd) {
  			CX_DEBUG (d, ("carrier on\n"));
  			d->cd = 1;
  			CX_UNLOCK (bd);
  			splx (s);
  			if (d->tty)
  				ttyld_modem(d->tty, 1);
  		} else {
  			CX_DEBUG (d, ("carrier loss\n"));
  			d->cd = 0;
  			CX_UNLOCK (bd);
  			splx (s);
  			if (d->tty)
  				ttyld_modem(d->tty, 0);
  		}
  	} else {
  		CX_UNLOCK (bd);
  		splx (s);
  	}
  }
  
  /*
   * Modem signal callback function.
   */
  static void cx_modem (cx_chan_t *c)
  {
  	drv_t *d = c->sys;
  
  	if (!d || c->mode != M_ASYNC)
  		return;
  	/* Handle carrier detect/loss. */
  	/* Carrier changed - delay processing DCD for a while
  	 * to give both sides some time to initialize. */
  	callout_reset (&d->dcd_timeout_handle, hz/2, cx_carrier, d);
  }
  
  #ifdef NETGRAPH
  static int ng_cx_constructor (node_p node)
  {
  	drv_t *d = NG_NODE_PRIVATE (node);
  	CX_DEBUG (d, ("Constructor\n"));
  	return EINVAL;
  }
  
  static int ng_cx_newhook (node_p node, hook_p hook, const char *name)
  {
  	int s;
  	drv_t *d = NG_NODE_PRIVATE (node);
  	bdrv_t *bd = d->board->sys;
  
  	if (d->chan->mode == M_ASYNC)
  		return EINVAL;
  
  	/* Attach debug hook */
  	if (strcmp (name, NG_CX_HOOK_DEBUG) == 0) {
  		NG_HOOK_SET_PRIVATE (hook, NULL);
  		d->debug_hook = hook;
  		return 0;
  	}
  
  	/* Check for raw hook */
  	if (strcmp (name, NG_CX_HOOK_RAW) != 0)
  		return EINVAL;
  
  	NG_HOOK_SET_PRIVATE (hook, d);
  	d->hook = hook;
  	s = splhigh ();
  	CX_LOCK (bd);
  	cx_up (d);
  	CX_UNLOCK (bd);
  	splx (s);
  	return 0;
  }
  
  static int print_modems (char *s, cx_chan_t *c, int need_header)
  {
  	int status = cx_modem_status (c->sys);
  	int length = 0;
  
  	if (need_header)
  		length += sprintf (s + length, "  LE   DTR  DSR  RTS  CTS  CD\n");
  	length += sprintf (s + length, "%4s %4s %4s %4s %4s %4s\n",
  		status & TIOCM_LE  ? "On" : "-",
  		status & TIOCM_DTR ? "On" : "-",
  		status & TIOCM_DSR ? "On" : "-",
  		status & TIOCM_RTS ? "On" : "-",
  		status & TIOCM_CTS ? "On" : "-",
  		status & TIOCM_CD  ? "On" : "-");
  	return length;
  }
  
  static int print_stats (char *s, cx_chan_t *c, int need_header)
  {
  	int length = 0;
  
  	if (need_header)
  		length += sprintf (s + length, "  Rintr   Tintr   Mintr   Ibytes   Ipkts   Ierrs   Obytes   Opkts   Oerrs\n");
  	length += sprintf (s + length, "%7ld %7ld %7ld %8ld %7ld %7ld %8ld %7ld %7ld\n",
  		c->rintr, c->tintr, c->mintr, c->ibytes, c->ipkts,
  		c->ierrs, c->obytes, c->opkts, c->oerrs);
  	return length;
  }
  
  static int print_chan (char *s, cx_chan_t *c)
  {
  	drv_t *d = c->sys;
  	int length = 0;
  
  	length += sprintf (s + length, "cx%d", c->board->num * NCHAN + c->num);
  	if (d->chan->debug)
  		length += sprintf (s + length, " debug=%d", d->chan->debug);
  
  	if (cx_get_baud (c))
  		length += sprintf (s + length, " %ld", cx_get_baud (c));
  	else
  		length += sprintf (s + length, " extclock");
  
  	if (c->mode == M_HDLC) {
  		length += sprintf (s + length, " dpll=%s", cx_get_dpll (c) ? "on" : "off");
  		length += sprintf (s + length, " nrzi=%s", cx_get_nrzi (c) ? "on" : "off");
  	}
  
  	length += sprintf (s + length, " loop=%s", cx_get_loop (c) ? "on\n" : "off\n");
  	return length;
  }
  
  static int ng_cx_rcvmsg (node_p node, item_p item, hook_p lasthook)
  {
  	drv_t *d = NG_NODE_PRIVATE (node);
  	struct ng_mesg *msg;
  	struct ng_mesg *resp = NULL;
  	int error = 0;
  
  	if (!d)
  		return EINVAL;
  		
  	CX_DEBUG (d, ("Rcvmsg\n"));
  	NGI_GET_MSG (item, msg);
  	switch (msg->header.typecookie) {
  	default:
  		error = EINVAL;
  		break;
  
  	case NGM_CX_COOKIE:
  		printf ("Don't forget to implement\n");
  		error = EINVAL;
  		break;
  
  	case NGM_GENERIC_COOKIE:
  		switch (msg->header.cmd) {
  		default:
  			error = EINVAL;
  			break;
  
  		case NGM_TEXT_STATUS: {
  			char *s;
  			int l = 0;
  			int dl = sizeof (struct ng_mesg) + 730;
  
  			NG_MKRESPONSE (resp, msg, dl, M_NOWAIT);
  			if (! resp) {
  				error = ENOMEM;
  				break;
  			}
  			bzero (resp, dl);
  			s = (resp)->data;
  			l += print_chan (s + l, d->chan);
  			l += print_stats (s + l, d->chan, 1);
  			l += print_modems (s + l, d->chan, 1);
  			strncpy ((resp)->header.cmdstr, "status", NG_CMDSTRSIZ);
  			}
  			break;
  		}
  		break;
  	}
  	NG_RESPOND_MSG (error, node, item, resp);
  	NG_FREE_MSG (msg);
  	return error;
  }
  
  static int ng_cx_rcvdata (hook_p hook, item_p item)
  {
  	drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE(hook));
  	struct mbuf *m;
  	struct ng_tag_prio *ptag;
  	bdrv_t *bd;
  	struct ifqueue *q;
  	int s;
  
  	NGI_GET_M (item, m);
  	NG_FREE_ITEM (item);
  	if (! NG_HOOK_PRIVATE (hook) || ! d) {
  		NG_FREE_M (m);
  		return ENETDOWN;
  	}
  
  	bd = d->board->sys;
  	/* Check for high priority data */
  	if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
  	    NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
  		q = &d->hi_queue;
  	else
  		q = &d->lo_queue;
  
  	s = splhigh ();
  	CX_LOCK (bd);
  	IF_LOCK (q);
  	if (_IF_QFULL (q)) {
  		IF_UNLOCK (q);
  		CX_UNLOCK (bd);
  		splx (s);
  		NG_FREE_M (m);
  		return ENOBUFS;
  	}
  	_IF_ENQUEUE (q, m);
  	IF_UNLOCK (q);
  	cx_start (d);
  	CX_UNLOCK (bd);
  	splx (s);
  	return 0;
  }
  
  static int ng_cx_rmnode (node_p node)
  {
  	drv_t *d = NG_NODE_PRIVATE (node);
  	bdrv_t *bd;
  
  	CX_DEBUG (d, ("Rmnode\n"));
  	if (d && d->running) {
  		int s = splhigh ();
  		bd = d->board->sys;
  		CX_LOCK (bd);
  		cx_down (d);
  		CX_UNLOCK (bd);
  		splx (s);
  	}
  #ifdef	KLD_MODULE
  	if (node->nd_flags & NGF_REALLY_DIE) {
  		NG_NODE_SET_PRIVATE (node, NULL);
  		NG_NODE_UNREF (node);
  	}
  	NG_NODE_REVIVE(node);		/* Persistent node */
  #endif
  	return 0;
  }
  
  static int ng_cx_connect (hook_p hook)
  {
  	drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
  
  	callout_reset (&d->timeout_handle, hz, cx_watchdog_timer, d);
  	return 0;
  }
  
  static int ng_cx_disconnect (hook_p hook)
  {
  	drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
  	bdrv_t *bd = d->board->sys;
  	int s;
  
  	s = splhigh ();
  	CX_LOCK (bd);
  	if (NG_HOOK_PRIVATE (hook))
  		cx_down (d);
  	CX_UNLOCK (bd);
  	splx (s);
  	/* If we were wait it than it reasserted now, just stop it. */
  	if (!callout_drain (&d->timeout_handle))
  		callout_stop (&d->timeout_handle);
  	return 0;
  }
  #endif /*NETGRAPH*/
  
  static int cx_modevent (module_t mod, int type, void *unused)
  {
  	static int load_count = 0;
  
  	switch (type) {
  	case MOD_LOAD:
  #ifdef NETGRAPH
  		if (ng_newtype (&typestruct))
  			printf ("Failed to register ng_cx\n");
  #endif
  		++load_count;
  
  		callout_init (&timeout_handle, 1);
  		callout_reset (&timeout_handle, hz*5, cx_timeout, 0);
  		/* Software interrupt. */
  		swi_add(&tty_intr_event, "cx", cx_softintr, NULL, SWI_TTY,
  		    INTR_MPSAFE, &cx_fast_ih);
  		break;
  	case MOD_UNLOAD:
  		if (load_count == 1) {
  			printf ("Removing device entry for Sigma\n");
  #ifdef NETGRAPH
  			ng_rmtype (&typestruct);
  #endif			
  		}
  		/* If we were wait it than it reasserted now, just stop it. */
  		if (!callout_drain (&timeout_handle))
  			callout_stop (&timeout_handle);
  		swi_remove (cx_fast_ih);
  		--load_count;
  		break;
  	case MOD_SHUTDOWN:
  		break;
  	}
  	return 0;
  }
  
  #ifdef NETGRAPH
  static struct ng_type typestruct = {
  	.version	= NG_ABI_VERSION,
  	.name		= NG_CX_NODE_TYPE,
  	.constructor	= ng_cx_constructor,
  	.rcvmsg		= ng_cx_rcvmsg,
  	.shutdown	= ng_cx_rmnode,
  	.newhook	= ng_cx_newhook,
  	.connect	= ng_cx_connect,
  	.rcvdata	= ng_cx_rcvdata,
  	.disconnect	= ng_cx_disconnect,
  };
  #endif /*NETGRAPH*/
  
  #ifdef NETGRAPH
  MODULE_DEPEND (ng_cx, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
  #else
  MODULE_DEPEND (isa_cx, sppp, 1, 1, 1);
  #endif
  DRIVER_MODULE (cx, isa, cx_isa_driver, cx_devclass, cx_modevent, NULL);
  MODULE_VERSION (cx, 1);
  