1035 lines
23 KiB
C
1035 lines
23 KiB
C
/* $NetBSD: z8530tty.c,v 1.3 1996/02/19 04:34:01 gwr Exp $ */
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/*
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* Copyright (c) 1994 Gordon W. Ross
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)zs.c 8.1 (Berkeley) 7/19/93
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*/
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/*
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* Zilog Z8530 Dual UART driver (tty interface)
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*
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* This is the "slave" driver that will be attached to
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* the "zsc" driver for plain "tty" async. serial lines.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <dev/ic/z8530reg.h>
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#include <machine/z8530var.h>
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#ifdef KGDB
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extern int zs_check_kgdb();
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#endif
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/*
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* Allow the MD var.h to override the default CFLAG so that
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* console messages during boot come out with correct parity.
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*/
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#ifndef ZSTTY_DEF_CFLAG
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#define ZSTTY_DEF_CFLAG TTYDEF_CFLAG
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#endif
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/*
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* How many input characters we can buffer.
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* The port-specific var.h may override this.
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* Note: must be a power of two!
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*/
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#ifndef ZSTTY_RING_SIZE
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#define ZSTTY_RING_SIZE 1024
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#endif
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#define ZSTTY_RING_MASK (ZSTTY_RING_SIZE-1)
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struct zstty_softc {
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struct device zst_dev; /* required first: base device */
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struct tty *zst_tty;
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struct zs_chanstate *zst_cs;
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int zst_hwflags; /* see z8530var.h */
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int zst_swflags; /* TIOCFLAG_SOFTCAR, ... <ttycom.h> */
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/* Flags to communicate with zstty_softint() */
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volatile int zst_intr_flags;
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#define INTR_RX_OVERRUN 1
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#define INTR_TX_EMPTY 2
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#define INTR_ST_CHECK 4
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/*
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* The transmit byte count and address are used for pseudo-DMA
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* output in the hardware interrupt code. PDMA can be suspended
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* to get pending changes done; heldtbc is used for this. It can
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* also be stopped for ^S; this sets TS_TTSTOP in tp->t_state.
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*/
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int zst_tbc; /* transmit byte count */
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caddr_t zst_tba; /* transmit buffer address */
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int zst_heldtbc; /* held tbc while xmission stopped */
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/*
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* Printing an overrun error message often takes long enough to
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* cause another overrun, so we only print one per second.
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*/
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long zst_rotime; /* time of last ring overrun */
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long zst_fotime; /* time of last fifo overrun */
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/*
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* The receive ring buffer.
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*/
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u_int zst_rbget; /* ring buffer `get' index */
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volatile u_int zst_rbput; /* ring buffer `put' index */
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u_short zst_rbuf[ZSTTY_RING_SIZE]; /* rr1, data pairs */
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};
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/* Definition of the driver for autoconfig. */
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static int zstty_match(struct device *, void *, void *);
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static void zstty_attach(struct device *, struct device *, void *);
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struct cfdriver zsttycd = {
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NULL, "zstty", zstty_match, zstty_attach,
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DV_TTY, sizeof(struct zstty_softc), NULL,
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};
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struct zsops zsops_tty;
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/* Routines called from other code. */
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cdev_decl(zs); /* open, close, read, write, ioctl, stop, ... */
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static void zsstart(struct tty *);
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static int zsparam(struct tty *, struct termios *);
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static void zs_modem(struct zstty_softc *zst, int onoff);
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/*
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* zstty_match: how is this zs channel configured?
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*/
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int
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zstty_match(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct cfdata *cf = match;
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struct zsc_attach_args *args = aux;
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/* Exact match is better than wildcard. */
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if (cf->cf_loc[0] == args->channel)
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return 2;
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/* This driver accepts wildcard. */
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if (cf->cf_loc[0] == -1)
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return 1;
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return 0;
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}
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void
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zstty_attach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct zsc_softc *zsc = (void *) parent;
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struct zstty_softc *zst = (void *) self;
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struct zsc_attach_args *args = aux;
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struct zs_chanstate *cs;
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struct cfdata *cf;
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struct tty *tp;
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int channel, tty_unit;
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dev_t dev;
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cf = zst->zst_dev.dv_cfdata;
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tty_unit = zst->zst_dev.dv_unit;
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channel = args->channel;
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cs = &zsc->zsc_cs[channel];
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cs->cs_private = zst;
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cs->cs_ops = &zsops_tty;
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zst->zst_cs = cs;
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zst->zst_swflags = cf->cf_flags; /* softcar, etc. */
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zst->zst_hwflags = args->hwflags;
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dev = makedev(ZSTTY_MAJOR, tty_unit);
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if (zst->zst_swflags)
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printf(" flags 0x%x", zst->zst_swflags);
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if (zst->zst_hwflags & ZS_HWFLAG_CONSOLE)
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printf(" (console)");
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else {
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#ifdef KGDB
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/*
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* Allow kgdb to "take over" this port. If this port is
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* NOT the kgdb port, zs_check_kgdb() will return zero.
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* If it IS the kgdb port, it will print "kgdb,...\n"
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* and then return non-zero.
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*/
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if (zs_check_kgdb(cs, dev)) {
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/*
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* This is the kgdb port (exclusive use)
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* so skip the normal attach code.
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*/
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return;
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}
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#endif
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}
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printf("\n");
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tp = zst->zst_tty = ttymalloc();
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tp->t_dev = dev;
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tp->t_oproc = zsstart;
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tp->t_param = zsparam;
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/*
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* Hardware init
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*/
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if (zst->zst_hwflags & ZS_HWFLAG_CONSOLE) {
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/* This unit is the console. */
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zst->zst_swflags |= TIOCFLAG_SOFTCAR;
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/* Call _param so interrupts get enabled. */
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cs->cs_defspeed = zs_getspeed(cs);
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tp->t_ispeed = cs->cs_defspeed;
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tp->t_ospeed = cs->cs_defspeed;
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tp->t_cflag = ZSTTY_DEF_CFLAG;
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(void) zsparam(tp, &tp->t_termios);
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} else {
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/* Not the console; may need reset. */
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int reset, s;
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reset = (channel == 0) ?
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ZSWR9_A_RESET : ZSWR9_B_RESET;
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s = splzs();
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zs_write_reg(cs, 9, reset);
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splx(s);
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}
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/*
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* Initialize state of modem control lines (DTR).
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* If softcar is set, turn on DTR now and leave it.
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* otherwise, turn off DTR now, and raise in open.
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* (Keeps modem from answering too early.)
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*/
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zs_modem(zst, (zst->zst_swflags & TIOCFLAG_SOFTCAR) ? 1 : 0);
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}
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/*
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* Return pointer to our tty.
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*/
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struct tty *
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zstty(dev)
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dev_t dev;
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{
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struct zstty_softc *zst;
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int unit = minor(dev);
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#ifdef DIAGNOSTIC
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if (unit >= zsttycd.cd_ndevs)
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panic("zstty");
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#endif
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zst = zsttycd.cd_devs[unit];
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return (zst->zst_tty);
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}
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/*
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* Open a zs serial (tty) port.
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*/
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int
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zsopen(dev, flags, mode, p)
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dev_t dev;
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int flags;
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int mode;
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struct proc *p;
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{
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register struct tty *tp;
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register struct zs_chanstate *cs;
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struct zstty_softc *zst;
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int error, s, unit;
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unit = minor(dev);
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if (unit >= zsttycd.cd_ndevs)
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return (ENXIO);
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zst = zsttycd.cd_devs[unit];
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if (zst == NULL)
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return (ENXIO);
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tp = zst->zst_tty;
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cs = zst->zst_cs;
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/* If KGDB took the line, then tp==NULL */
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if (tp == NULL)
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return (EBUSY);
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/* It's simpler to do this up here. */
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if (((tp->t_state & (TS_ISOPEN | TS_XCLUDE))
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== (TS_ISOPEN | TS_XCLUDE))
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&& (p->p_ucred->cr_uid != 0) )
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{
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return (EBUSY);
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}
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s = spltty();
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if ((tp->t_state & TS_ISOPEN) == 0) {
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/* First open. */
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ttychars(tp);
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_cflag = ZSTTY_DEF_CFLAG;
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if (zst->zst_swflags & TIOCFLAG_CLOCAL)
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tp->t_cflag |= CLOCAL;
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if (zst->zst_swflags & TIOCFLAG_CRTSCTS)
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tp->t_cflag |= CRTSCTS;
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if (zst->zst_swflags & TIOCFLAG_MDMBUF)
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tp->t_cflag |= MDMBUF;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_ispeed = tp->t_ospeed = cs->cs_defspeed;
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(void) zsparam(tp, &tp->t_termios);
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ttsetwater(tp);
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/* Flush any pending input. */
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zst->zst_rbget = zst->zst_rbput;
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zs_iflush(cs); /* XXX */
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/* Turn on DTR */
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zs_modem(zst, 1);
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if (zst->zst_swflags & TIOCFLAG_SOFTCAR) {
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tp->t_state |= TS_CARR_ON;
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}
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}
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error = 0;
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/* Wait for carrier. */
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for (;;) {
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register int rr0;
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/* Might never get status intr if carrier already on. */
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rr0 = zs_read_csr(cs);
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if (rr0 & ZSRR0_DCD) {
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tp->t_state |= TS_CARR_ON;
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break;
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}
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if ((tp->t_state & TS_CARR_ON) ||
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(tp->t_cflag & CLOCAL) ||
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(flags & O_NONBLOCK) )
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{
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break;
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}
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tp->t_state |= TS_WOPEN;
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error = ttysleep(tp, (caddr_t)&tp->t_rawq,
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TTIPRI | PCATCH, ttopen, 0);
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if (error) {
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if ((tp->t_state & TS_ISOPEN) == 0) {
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/* Never get here with softcar */
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zs_modem(zst, 0);
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tp->t_state &= ~TS_WOPEN;
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ttwakeup(tp);
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}
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break;
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}
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}
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splx(s);
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if (error == 0)
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error = linesw[tp->t_line].l_open(dev, tp);
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return (error);
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}
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/*
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* Close a zs serial port.
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*/
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int
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zsclose(dev, flags, mode, p)
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dev_t dev;
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int flags;
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int mode;
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struct proc *p;
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{
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struct zstty_softc *zst;
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register struct zs_chanstate *cs;
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register struct tty *tp;
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struct zsinfo *zi;
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int hup, s;
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zst = zsttycd.cd_devs[minor(dev)];
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cs = zst->zst_cs;
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tp = zst->zst_tty;
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/* XXX This is for cons.c. */
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if ((tp->t_state & TS_ISOPEN) == 0)
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return 0;
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(*linesw[tp->t_line].l_close)(tp, flags);
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hup = tp->t_cflag & HUPCL;
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if (zst->zst_swflags & TIOCFLAG_SOFTCAR)
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hup = 0;
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if (hup) {
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zs_modem(zst, 0);
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/* hold low for 1 second */
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(void) tsleep((caddr_t)cs, TTIPRI, ttclos, hz);
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}
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if (cs->cs_creg[5] & ZSWR5_BREAK) {
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zs_break(cs, 0);
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}
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/* XXX - turn off interrupts? */
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ttyclose(tp);
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return (0);
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}
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/*
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* Read/write zs serial port.
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*/
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int
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zsread(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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register struct zstty_softc *zst;
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register struct tty *tp;
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zst = zsttycd.cd_devs[minor(dev)];
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tp = zst->zst_tty;
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return (linesw[tp->t_line].l_read(tp, uio, flags));
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}
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int
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zswrite(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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register struct zstty_softc *zst;
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register struct tty *tp;
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zst = zsttycd.cd_devs[minor(dev)];
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tp = zst->zst_tty;
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return (linesw[tp->t_line].l_write(tp, uio, flags));
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}
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#define TIOCFLAG_ALL (TIOCFLAG_SOFTCAR | TIOCFLAG_CLOCAL | \
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TIOCFLAG_CRTSCTS | TIOCFLAG_MDMBUF )
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int
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zsioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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register struct zstty_softc *zst;
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register struct zs_chanstate *cs;
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register struct tty *tp;
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register int error, tmp;
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zst = zsttycd.cd_devs[minor(dev)];
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cs = zst->zst_cs;
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tp = zst->zst_tty;
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error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
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if (error >= 0)
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return (error);
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error = ttioctl(tp, cmd, data, flag, p);
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if (error >= 0)
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return (error);
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switch (cmd) {
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case TIOCSBRK:
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zs_break(cs, 1);
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break;
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case TIOCCBRK:
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zs_break(cs, 0);
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break;
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case TIOCGFLAGS:
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*(int *)data = zst->zst_swflags;
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break;
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case TIOCSFLAGS:
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error = suser(p->p_ucred, &p->p_acflag);
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if (error != 0)
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return (EPERM);
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tmp = *(int *)data;
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/* Check for random bits... */
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if (tmp & ~TIOCFLAG_ALL)
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return(EINVAL);
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/* Silently enforce softcar on the console. */
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if (zst->zst_hwflags & ZS_HWFLAG_CONSOLE)
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tmp |= TIOCFLAG_SOFTCAR;
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/* These flags take effect during open. */
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zst->zst_swflags = tmp;
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break;
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case TIOCSDTR:
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zs_modem(zst, 1);
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break;
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case TIOCCDTR:
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zs_modem(zst, 0);
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break;
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case TIOCMSET:
|
|
case TIOCMBIS:
|
|
case TIOCMBIC:
|
|
case TIOCMGET:
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Start or restart transmission.
|
|
*/
|
|
static void
|
|
zsstart(tp)
|
|
register struct tty *tp;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register struct zs_chanstate *cs;
|
|
register int s, nch;
|
|
|
|
zst = zsttycd.cd_devs[minor(tp->t_dev)];
|
|
cs = zst->zst_cs;
|
|
|
|
s = spltty();
|
|
|
|
/*
|
|
* If currently active or delaying, no need to do anything.
|
|
*/
|
|
if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP))
|
|
goto out;
|
|
|
|
/*
|
|
* If there are sleepers, and output has drained below low
|
|
* water mark, awaken.
|
|
*/
|
|
if (tp->t_outq.c_cc <= tp->t_lowat) {
|
|
if (tp->t_state & TS_ASLEEP) {
|
|
tp->t_state &= ~TS_ASLEEP;
|
|
wakeup((caddr_t)&tp->t_outq);
|
|
}
|
|
selwakeup(&tp->t_wsel);
|
|
}
|
|
|
|
nch = ndqb(&tp->t_outq, 0); /* XXX */
|
|
if (nch) {
|
|
register char *p = tp->t_outq.c_cf;
|
|
|
|
/* mark busy, enable tx done interrupts, & send first byte */
|
|
tp->t_state |= TS_BUSY;
|
|
(void) splzs();
|
|
|
|
cs->cs_preg[1] |= ZSWR1_TIE;
|
|
cs->cs_creg[1] |= ZSWR1_TIE;
|
|
zs_write_reg(cs, 1, cs->cs_creg[1]);
|
|
zs_write_data(cs, *p);
|
|
zst->zst_tba = p + 1;
|
|
zst->zst_tbc = nch - 1;
|
|
} else {
|
|
/*
|
|
* Nothing to send, turn off transmit done interrupts.
|
|
* This is useful if something is doing polled output.
|
|
*/
|
|
(void) splzs();
|
|
cs->cs_preg[1] &= ~ZSWR1_TIE;
|
|
cs->cs_creg[1] &= ~ZSWR1_TIE;
|
|
zs_write_reg(cs, 1, cs->cs_creg[1]);
|
|
}
|
|
out:
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Stop output, e.g., for ^S or output flush.
|
|
*/
|
|
int
|
|
zsstop(tp, flag)
|
|
struct tty *tp;
|
|
int flag;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register struct zs_chanstate *cs;
|
|
register int s;
|
|
|
|
zst = zsttycd.cd_devs[minor(tp->t_dev)];
|
|
cs = zst->zst_cs;
|
|
|
|
s = splzs();
|
|
if (tp->t_state & TS_BUSY) {
|
|
/*
|
|
* Device is transmitting; must stop it.
|
|
*/
|
|
zst->zst_tbc = 0;
|
|
if ((tp->t_state & TS_TTSTOP) == 0)
|
|
tp->t_state |= TS_FLUSH;
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Set ZS tty parameters from termios.
|
|
* XXX - Should just copy the whole termios after
|
|
* making sure all the changes could be done.
|
|
* XXX - Only whack the UART when params change...
|
|
*/
|
|
static int
|
|
zsparam(tp, t)
|
|
register struct tty *tp;
|
|
register struct termios *t;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register struct zs_chanstate *cs;
|
|
register int s, bps, cflag, tconst;
|
|
u_char tmp3, tmp4, tmp5, reset;
|
|
|
|
zst = zsttycd.cd_devs[minor(tp->t_dev)];
|
|
cs = zst->zst_cs;
|
|
|
|
/*
|
|
* Because PCLK is only run at 4.9 MHz, the fastest we
|
|
* can go is 51200 baud (this corresponds to TC=1).
|
|
* This is somewhat unfortunate as there is no real
|
|
* reason we should not be able to handle higher rates.
|
|
*/
|
|
bps = t->c_ospeed;
|
|
if (bps < 0 || (t->c_ispeed && t->c_ispeed != bps))
|
|
return (EINVAL);
|
|
if (bps == 0) {
|
|
/* stty 0 => drop DTR and RTS */
|
|
zs_modem(zst, 0);
|
|
return (0);
|
|
}
|
|
tconst = BPS_TO_TCONST(cs->cs_pclk_div16, bps);
|
|
if (tconst < 0)
|
|
return (EINVAL);
|
|
|
|
/* Convert back to make sure we can do it. */
|
|
bps = TCONST_TO_BPS(cs->cs_pclk_div16, tconst);
|
|
if (bps != t->c_ospeed)
|
|
return (EINVAL);
|
|
tp->t_ispeed = tp->t_ospeed = bps;
|
|
|
|
cflag = t->c_cflag;
|
|
tp->t_cflag = cflag;
|
|
|
|
/*
|
|
* Block interrupts so that state will not
|
|
* be altered until we are done setting it up.
|
|
*/
|
|
s = splzs();
|
|
|
|
/*
|
|
* Initial values in cs_preg are set before
|
|
* our attach routine is called. The master
|
|
* interrupt enable is handled by zsc.c
|
|
*/
|
|
|
|
cs->cs_preg[12] = tconst;
|
|
cs->cs_preg[13] = tconst >> 8;
|
|
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
tmp3 = ZSWR3_RX_5;
|
|
tmp5 = ZSWR5_TX_5;
|
|
break;
|
|
case CS6:
|
|
tmp3 = ZSWR3_RX_6;
|
|
tmp5 = ZSWR5_TX_6;
|
|
break;
|
|
case CS7:
|
|
tmp3 = ZSWR3_RX_7;
|
|
tmp5 = ZSWR5_TX_7;
|
|
break;
|
|
case CS8:
|
|
default:
|
|
tmp3 = ZSWR3_RX_8;
|
|
tmp5 = ZSWR5_TX_8;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Output hardware flow control on the chip is horrendous: if
|
|
* carrier detect drops, the receiver is disabled. Hence we
|
|
* can only do this when the carrier is on.
|
|
*/
|
|
tmp3 |= ZSWR3_RX_ENABLE;
|
|
if (cflag & CCTS_OFLOW) {
|
|
if (zs_read_csr(cs) & ZSRR0_DCD)
|
|
tmp3 |= ZSWR3_HFC;
|
|
}
|
|
|
|
cs->cs_preg[3] = tmp3;
|
|
cs->cs_preg[5] = tmp5 | ZSWR5_TX_ENABLE | ZSWR5_DTR | ZSWR5_RTS;
|
|
|
|
tmp4 = ZSWR4_CLK_X16 | (cflag & CSTOPB ? ZSWR4_TWOSB : ZSWR4_ONESB);
|
|
if ((cflag & PARODD) == 0)
|
|
tmp4 |= ZSWR4_EVENP;
|
|
if (cflag & PARENB)
|
|
tmp4 |= ZSWR4_PARENB;
|
|
cs->cs_preg[4] = tmp4;
|
|
|
|
/*
|
|
* If nothing is being transmitted, set up new current values,
|
|
* else mark them as pending.
|
|
*/
|
|
if (cs->cs_heldchange == 0) {
|
|
if (tp->t_state & TS_BUSY) {
|
|
zst->zst_heldtbc = zst->zst_tbc;
|
|
zst->zst_tbc = 0;
|
|
cs->cs_heldchange = 1;
|
|
} else {
|
|
zs_loadchannelregs(cs);
|
|
}
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Raise or lower modem control (DTR/RTS) signals. If a character is
|
|
* in transmission, the change is deferred.
|
|
*/
|
|
static void
|
|
zs_modem(zst, onoff)
|
|
struct zstty_softc *zst;
|
|
int onoff;
|
|
{
|
|
struct zs_chanstate *cs;
|
|
struct tty *tp;
|
|
int s, bis, and;
|
|
|
|
cs = zst->zst_cs;
|
|
tp = zst->zst_tty;
|
|
|
|
if (onoff) {
|
|
bis = ZSWR5_DTR | ZSWR5_RTS;
|
|
and = ~0;
|
|
} else {
|
|
bis = 0;
|
|
and = ~(ZSWR5_DTR | ZSWR5_RTS);
|
|
}
|
|
s = splzs();
|
|
cs->cs_preg[5] = (cs->cs_preg[5] | bis) & and;
|
|
if (cs->cs_heldchange == 0) {
|
|
if (tp->t_state & TS_BUSY) {
|
|
zst->zst_heldtbc = zst->zst_tbc;
|
|
zst->zst_tbc = 0;
|
|
cs->cs_heldchange = 1;
|
|
} else {
|
|
cs->cs_creg[5] = (cs->cs_creg[5] | bis) & and;
|
|
zs_write_reg(cs, 5, cs->cs_creg[5]);
|
|
}
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
|
|
/****************************************************************
|
|
* Interface to the lower layer (zscc)
|
|
****************************************************************/
|
|
|
|
/*
|
|
* XXX: need to do input flow-control to avoid ring overrun.
|
|
*/
|
|
|
|
static int
|
|
zstty_rxint(cs)
|
|
register struct zs_chanstate *cs;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register put, put_next;
|
|
register u_char c, rr0, rr1;
|
|
|
|
zst = cs->cs_private;
|
|
put = zst->zst_rbput;
|
|
|
|
nextchar:
|
|
/* Read the input data ASAP. */
|
|
c = zs_read_data(cs);
|
|
|
|
/* Save the status register too. */
|
|
rr1 = zs_read_reg(cs, 1);
|
|
|
|
if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
|
|
/* Clear the receive error. */
|
|
zs_write_csr(cs, ZSWR0_RESET_ERRORS);
|
|
}
|
|
|
|
zst->zst_rbuf[put] = (c << 8) | rr1;
|
|
put_next = (put + 1) & ZSTTY_RING_MASK;
|
|
|
|
/* Would overrun if increment makes (put==get). */
|
|
if (put_next == zst->zst_rbget) {
|
|
zst->zst_intr_flags |= INTR_RX_OVERRUN;
|
|
} else {
|
|
/* OK, really increment. */
|
|
put = put_next;
|
|
}
|
|
|
|
/* Keep reading until the FIFO is empty. */
|
|
rr0 = zs_read_csr(cs);
|
|
if (rr0 & ZSRR0_RX_READY)
|
|
goto nextchar;
|
|
|
|
/* Done reading. */
|
|
zst->zst_rbput = put;
|
|
|
|
/* Ask for softint() call. */
|
|
cs->cs_softreq = 1;
|
|
return(1);
|
|
}
|
|
|
|
static int
|
|
zstty_txint(cs)
|
|
register struct zs_chanstate *cs;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register int count, rval;
|
|
|
|
zst = cs->cs_private;
|
|
count = zst->zst_tbc;
|
|
|
|
if (count > 0) {
|
|
/* Send the next char. */
|
|
zs_write_data(cs, *zst->zst_tba);
|
|
zst->zst_tba++;
|
|
zst->zst_tbc = --count;
|
|
rval = 0;
|
|
} else {
|
|
/* Nothing more to send. */
|
|
zs_write_csr(cs, ZSWR0_RESET_TXINT);
|
|
zst->zst_intr_flags |= INTR_TX_EMPTY;
|
|
rval = 1; /* want softcall */
|
|
}
|
|
|
|
cs->cs_softreq = rval;
|
|
return (rval);
|
|
}
|
|
|
|
static int
|
|
zstty_stint(cs)
|
|
register struct zs_chanstate *cs;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register int rr0;
|
|
|
|
zst = cs->cs_private;
|
|
|
|
rr0 = zs_read_csr(cs);
|
|
zs_write_csr(cs, ZSWR0_RESET_STATUS);
|
|
|
|
if ((rr0 & ZSRR0_BREAK) &&
|
|
(zst->zst_hwflags & ZS_HWFLAG_CONSOLE))
|
|
{
|
|
zs_abort();
|
|
return (0);
|
|
}
|
|
|
|
zst->zst_intr_flags |= INTR_ST_CHECK;
|
|
/* Ask for softint() call. */
|
|
cs->cs_softreq = 1;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Print out a ring or fifo overrun error message.
|
|
*/
|
|
static void
|
|
zsoverrun(zst, ptime, what)
|
|
struct zstty_softc *zst;
|
|
long *ptime;
|
|
char *what;
|
|
{
|
|
|
|
if (*ptime != time.tv_sec) {
|
|
*ptime = time.tv_sec;
|
|
log(LOG_WARNING, "%s: %s overrun\n",
|
|
zst->zst_dev.dv_xname, what);
|
|
}
|
|
}
|
|
|
|
static int
|
|
zstty_softint(cs)
|
|
struct zs_chanstate *cs;
|
|
{
|
|
register struct zstty_softc *zst;
|
|
register struct linesw *line;
|
|
register struct tty *tp;
|
|
register int get, c, s;
|
|
int intr_flags;
|
|
register u_short ring_data;
|
|
register u_char rr0, rr1;
|
|
|
|
zst = cs->cs_private;
|
|
tp = zst->zst_tty;
|
|
line = &linesw[tp->t_line];
|
|
|
|
/* Atomically get and clear flags. */
|
|
s = splzs();
|
|
intr_flags = zst->zst_intr_flags;
|
|
zst->zst_intr_flags = 0;
|
|
splx(s);
|
|
|
|
if (intr_flags & INTR_RX_OVERRUN) {
|
|
/* May turn this on again below. */
|
|
intr_flags &= ~INTR_RX_OVERRUN;
|
|
zsoverrun(zst, "ring");
|
|
}
|
|
|
|
/*
|
|
* Copy data from the receive ring into the tty layer.
|
|
*/
|
|
get = zst->zst_rbget;
|
|
while (get != zst->zst_rbput) {
|
|
ring_data = zst->zst_rbuf[get];
|
|
get = (get + 1) & ZSTTY_RING_MASK;
|
|
|
|
if (ring_data & ZSRR1_DO)
|
|
intr_flags |= INTR_RX_OVERRUN;
|
|
/* low byte of ring_data is rr1 */
|
|
c = (ring_data >> 8) & 0xff;
|
|
if (ring_data & ZSRR1_FE)
|
|
c |= TTY_FE;
|
|
if (ring_data & ZSRR1_PE)
|
|
c |= TTY_PE;
|
|
|
|
line->l_rint(c, tp);
|
|
}
|
|
zst->zst_rbget = get;
|
|
|
|
/* If set, it is from the loop above. */
|
|
if (intr_flags & INTR_RX_OVERRUN) {
|
|
zsoverrun(zst, "fifo");
|
|
}
|
|
|
|
if (intr_flags & INTR_TX_EMPTY) {
|
|
/*
|
|
* Transmit done. Change registers and resume,
|
|
* or just clear BUSY.
|
|
*/
|
|
if (cs->cs_heldchange) {
|
|
s = splzs();
|
|
rr0 = zs_read_csr(cs);
|
|
if ((rr0 & ZSRR0_DCD) == 0)
|
|
cs->cs_preg[3] &= ~ZSWR3_HFC;
|
|
zs_loadchannelregs(cs);
|
|
splx(s);
|
|
cs->cs_heldchange = 0;
|
|
|
|
if (zst->zst_heldtbc &&
|
|
(tp->t_state & TS_TTSTOP) == 0)
|
|
{
|
|
zst->zst_tbc = zst->zst_heldtbc - 1;
|
|
zs_write_data(cs, *zst->zst_tba);
|
|
zst->zst_tba++;
|
|
goto tx_resumed;
|
|
}
|
|
}
|
|
tp->t_state &= ~TS_BUSY;
|
|
if (tp->t_state & TS_FLUSH)
|
|
tp->t_state &= ~TS_FLUSH;
|
|
else
|
|
ndflush(&tp->t_outq, zst->zst_tba -
|
|
(caddr_t) tp->t_outq.c_cf);
|
|
line->l_start(tp);
|
|
tx_resumed:
|
|
}
|
|
|
|
if (intr_flags & INTR_ST_CHECK) {
|
|
/*
|
|
* Status line change.
|
|
*
|
|
* The chip's hardware flow control is, as noted in zsreg.h,
|
|
* busted---if the DCD line goes low the chip shuts off the
|
|
* receiver (!). If we want hardware CTS flow control but do
|
|
* not have it, and carrier is now on, turn HFC on; if we have
|
|
* HFC now but carrier has gone low, turn it off.
|
|
*/
|
|
s = splzs();
|
|
rr0 = zs_read_csr(cs);
|
|
if (rr0 & ZSRR0_DCD) {
|
|
if (tp->t_cflag & CCTS_OFLOW &&
|
|
(cs->cs_creg[3] & ZSWR3_HFC) == 0) {
|
|
cs->cs_creg[3] |= ZSWR3_HFC;
|
|
zs_write_reg(cs, 3, cs->cs_creg[3]);
|
|
}
|
|
} else {
|
|
if (cs->cs_creg[3] & ZSWR3_HFC) {
|
|
cs->cs_creg[3] &= ~ZSWR3_HFC;
|
|
zs_write_reg(cs, 3, cs->cs_creg[3]);
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
/* Was there a change on DCD? */
|
|
if ((rr0 ^ cs->cs_rr0) & ZSRR0_DCD) {
|
|
c = ((rr0 & ZSRR0_DCD) != 0);
|
|
if (line->l_modem(tp, c) == 0)
|
|
zs_modem(zst, c);
|
|
}
|
|
cs->cs_rr0 = rr0;
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
struct zsops zsops_tty = {
|
|
zstty_rxint, /* receive char available */
|
|
zstty_stint, /* external/status */
|
|
zstty_txint, /* xmit buffer empty */
|
|
zstty_softint, /* process software interrupt */
|
|
};
|
|
|