1457 lines
34 KiB
C
1457 lines
34 KiB
C
/* $NetBSD: zs.c,v 1.13 1994/12/12 18:59:27 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 (ZSCC) driver.
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*
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* Runs two tty ports (ttya and ttyb) on zs0,
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* and runs a keyboard and mouse on zs1.
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*
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* This driver knows far too much about chip to usage mappings.
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*/
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#define NZS 2 /* XXX */
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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 <machine/autoconf.h>
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#include <machine/cpu.h>
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#include <machine/obio.h>
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#include <machine/mon.h>
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#include <machine/eeprom.h>
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#include <machine/kbd.h>
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#include <dev/cons.h>
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#include "zsreg.h"
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#include "zsvar.h"
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#ifdef KGDB
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#include <machine/remote-sl.h>
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#endif
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#define ZSMAJOR 12 /* XXX */
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#define ZS_KBD 2 /* XXX */
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#define ZS_MOUSE 3 /* XXX */
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/* The Sun3 provides a 4.9152 MHz clock to the ZS chips. */
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#define PCLK (9600 * 512) /* PCLK pin input clock rate */
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/*
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* Select software interrupt levels.
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*/
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#define ZSSOFT_PRI 2 /* XXX - Want TTY_PRI */
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#define ZSHARD_PRI 6 /* Wired on the CPU board... */
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/*
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* Software state per found chip. This would be called `zs_softc',
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* but the previous driver had a rather different zs_softc....
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*/
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struct zsinfo {
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struct device zi_dev; /* base device */
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volatile struct zsdevice *zi_zs;/* chip registers */
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struct zs_chanstate zi_cs[2]; /* channel A and B software state */
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};
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struct tty *zs_tty[NZS * 2]; /* XXX should be dynamic */
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/* Definition of the driver for autoconfig. */
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static int zs_match(struct device *, void *, void *);
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static void zs_attach(struct device *, struct device *, void *);
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struct cfdriver zscd = {
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NULL, "zs", zs_match, zs_attach,
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DV_TTY, sizeof(struct zsinfo) };
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/* Interrupt handlers. */
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static int zshard(int);
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static int zssoft(int);
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struct zs_chanstate *zslist;
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/* Routines called from other code. */
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int zsopen(dev_t, int, int, struct proc *);
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int zsclose(dev_t, int, int, struct proc *);
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static void zsiopen(struct tty *);
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static void zsiclose(struct tty *);
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static void zsstart(struct tty *);
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void zsstop(struct tty *, int);
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static int zsparam(struct tty *, struct termios *);
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/* Routines purely local to this driver. */
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static int zs_getspeed(volatile struct zschan *);
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static void zs_reset(volatile struct zschan *, int, int);
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static void zs_modem(struct zs_chanstate *, int);
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static void zs_loadchannelregs(volatile struct zschan *, u_char *);
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static u_char zs_read(volatile struct zschan *, u_char);
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static u_char zs_write(volatile struct zschan *, u_char, u_char);
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/* Console stuff. */
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static volatile struct zschan *zs_conschan;
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#ifdef KGDB
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/* KGDB stuff. Must reboot to change zs_kgdbunit. */
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extern int kgdb_dev, kgdb_rate;
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static int zs_kgdb_savedspeed;
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static void zs_checkkgdb(int, struct zs_chanstate *, struct tty *);
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#endif
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/*
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* Console keyboard L1-A processing is done in the hardware interrupt code,
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* so we need to duplicate some of the console keyboard decode state. (We
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* must not use the regular state as the hardware code keeps ahead of the
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* software state: the software state tracks the most recent ring input but
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* the hardware state tracks the most recent ZSCC input.) See also kbd.h.
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*/
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static struct conk_state { /* console keyboard state */
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char conk_id; /* true => ID coming up (console only) */
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char conk_l1; /* true => L1 pressed (console only) */
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} zsconk_state;
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int zshardscope;
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int zsshortcuts; /* number of "shortcut" software interrupts */
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int zssoftpending; /* We have done isr_soft_request() */
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static struct zsdevice *zsaddr[NZS]; /* XXX, but saves work */
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/* Default OBIO addresses. */
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static int zs_physaddr[NZS] = { OBIO_ZS, OBIO_KEYBD_MS };
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/* Find PROM mappings (for console support). */
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void zs_init()
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{
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if (zsaddr[0] == NULL)
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zsaddr[0] = (struct zsdevice *)
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obio_find_mapping(OBIO_ZS, OBIO_ZS_SIZE);
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if (zsaddr[1] == NULL)
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zsaddr[1] = (struct zsdevice *)
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obio_find_mapping(OBIO_KEYBD_MS, OBIO_ZS_SIZE);
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}
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/*
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* Match slave number to zs unit number, so that misconfiguration will
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* not set up the keyboard as ttya, etc.
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*/
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static int
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zs_match(struct device *parent, void *vcf, void *args)
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{
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struct cfdata *cf = vcf;
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struct confargs *ca = args;
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int unit, x;
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unit = cf->cf_unit;
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if (unit < 0 || unit >= NZS)
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return (0);
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if (ca->ca_paddr == -1)
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ca->ca_paddr = zs_physaddr[unit];
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if (ca->ca_intpri == -1)
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ca->ca_intpri = ZSHARD_PRI;
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/* The peek returns non-zero on error. */
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return !bus_peek(ca, 0, 1, &x);
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}
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/*
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* Attach a found zs.
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*
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* USE ROM PROPERTIES port-a-ignore-cd AND port-b-ignore-cd FOR
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* SOFT CARRIER, AND keyboard PROPERTY FOR KEYBOARD/MOUSE?
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*/
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static void
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zs_attach(struct device *parent, struct device *self, void *args)
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{
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struct cfdata *cf;
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struct confargs *ca;
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register int zs, unit;
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register struct zsinfo *zi;
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register struct zs_chanstate *cs;
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register volatile struct zsdevice *addr;
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register struct tty *tp, *ctp;
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int softcar;
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static int didintr;
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cf = self->dv_cfdata;
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zs = self->dv_unit;
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ca = args;
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printf(" softpri %d\n", ZSSOFT_PRI);
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if (zsaddr[zs] == NULL) {
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zsaddr[zs] = (struct zsdevice *)
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obio_alloc(ca->ca_paddr, OBIO_ZS_SIZE);
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}
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addr = zsaddr[zs];
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if (!didintr) {
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didintr = 1;
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isr_add_autovect(zssoft, NULL, ZSSOFT_PRI);
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isr_add_autovect(zshard, NULL, ZSHARD_PRI);
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}
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zi = (struct zsinfo *)self;
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zi->zi_zs = addr;
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unit = zs * 2;
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cs = zi->zi_cs;
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if(!zs_tty[unit])
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zs_tty[unit] = ttymalloc();
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tp = zs_tty[unit];
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if(!zs_tty[unit+1])
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zs_tty[unit+1] = ttymalloc();
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if (unit == 0) {
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softcar = 0;
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} else
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softcar = cf->cf_flags;
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/* link into interrupt list with order (A,B) (B=A+1) */
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cs[0].cs_next = &cs[1];
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cs[1].cs_next = zslist;
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zslist = cs;
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cs->cs_unit = unit;
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cs->cs_zc = &addr->zs_chan[CHAN_A];
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cs->cs_speed = zs_getspeed(cs->cs_zc);
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#ifdef DEBUG
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mon_printf("zs%da speed %d ", zs, cs->cs_speed);
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#endif
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cs->cs_softcar = softcar & 1;
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#if 0
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/* XXX - Drop carrier here? -gwr */
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zs_modem(cs, cs->cs_softcar ? 1 : 0);
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#endif
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cs->cs_ttyp = tp;
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tp->t_dev = makedev(ZSMAJOR, unit);
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tp->t_oproc = zsstart;
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tp->t_param = zsparam;
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if (cs->cs_zc == zs_conschan) {
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/* This unit is the console. */
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cs->cs_consio = 1;
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cs->cs_brkabort = 1;
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cs->cs_softcar = 1;
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} else {
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/* Can not run kgdb on the console? */
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#ifdef KGDB
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zs_checkkgdb(unit, cs, tp);
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#endif
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}
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if (unit == ZS_KBD) {
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/*
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* Keyboard: tell /dev/kbd driver how to talk to us.
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*/
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tp->t_ispeed = tp->t_ospeed = cs->cs_speed;
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tp->t_cflag = CS8;
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kbd_serial(tp, zsiopen, zsiclose);
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cs->cs_conk = 1; /* do L1-A processing */
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}
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unit++;
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cs++;
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tp = zs_tty[unit];
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cs->cs_unit = unit;
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cs->cs_zc = &addr->zs_chan[CHAN_B];
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cs->cs_speed = zs_getspeed(cs->cs_zc);
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#ifdef DEBUG
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mon_printf("zs%db speed %d\n", zs, cs->cs_speed);
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#endif
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cs->cs_softcar = softcar & 2;
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#if 0
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/* XXX - Drop carrier here? -gwr */
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zs_modem(cs, cs->cs_softcar ? 1 : 0);
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#endif
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cs->cs_ttyp = tp;
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tp->t_dev = makedev(ZSMAJOR, unit);
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tp->t_oproc = zsstart;
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tp->t_param = zsparam;
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if (cs->cs_zc == zs_conschan) {
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/* This unit is the console. */
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cs->cs_consio = 1;
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cs->cs_brkabort = 1;
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cs->cs_softcar = 1;
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} else {
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/* Can not run kgdb on the console? */
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#ifdef KGDB
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zs_checkkgdb(unit, cs, tp);
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#endif
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}
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if (unit == ZS_MOUSE) {
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/*
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* Mouse: tell /dev/mouse driver how to talk to us.
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*/
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tp->t_ispeed = tp->t_ospeed = cs->cs_speed;
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tp->t_cflag = CS8;
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ms_serial(tp, zsiopen, zsiclose);
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}
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}
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/*
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* Put a channel in a known state. Interrupts may be left disabled
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* or enabled, as desired.
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*/
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static void
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zs_reset(zc, inten, speed)
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volatile struct zschan *zc;
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int inten, speed;
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{
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int tconst;
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static u_char reg[16] = {
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0,
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0,
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0,
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ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
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ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
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ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
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0,
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0,
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0,
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0,
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ZSWR10_NRZ,
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ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
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0,
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0,
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ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA,
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ZSWR15_BREAK_IE | ZSWR15_DCD_IE,
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};
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reg[9] = inten ? ZSWR9_MASTER_IE | ZSWR9_NO_VECTOR : ZSWR9_NO_VECTOR;
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tconst = BPS_TO_TCONST(PCLK / 16, speed);
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reg[12] = tconst;
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reg[13] = tconst >> 8;
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zs_loadchannelregs(zc, reg);
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}
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/*
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* Console support
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*/
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/*
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* Used by the kd driver to find out if it can work.
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*/
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int
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zscnprobe_kbd()
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{
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if (zsaddr[1] == NULL) {
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mon_printf("zscnprobe_kbd: zs1 not yet mapped\n");
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return CN_DEAD;
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}
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return CN_INTERNAL;
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}
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/*
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* This is the console probe routine for ttya and ttyb.
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*/
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static int
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zscnprobe(struct consdev *cn, int unit)
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{
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int maj, eeCons;
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if (zsaddr[0] == NULL) {
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mon_printf("zscnprobe: zs0 not mapped\n");
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cn->cn_pri = CN_DEAD;
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return 0;
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}
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/* XXX - Also try to make sure it exists? */
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/* locate the major number */
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for (maj = 0; maj < nchrdev; maj++)
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if (cdevsw[maj].d_open == (void*)zsopen)
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break;
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cn->cn_dev = makedev(maj, unit);
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/* Use EEPROM console setting to decide "remote" console. */
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eeCons = ee_get_byte(EE_CONS_OFFSET, 0);
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/* Hack: EE_CONS_TTYA + 1 == EE_CONS_TTYB */
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if (eeCons == (EE_CONS_TTYA + unit)) {
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cn->cn_pri = CN_REMOTE;
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} else {
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cn->cn_pri = CN_NORMAL;
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}
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return (0);
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}
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/* This is the constab entry for TTYA. */
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int
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zscnprobe_a(struct consdev *cn)
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{
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return (zscnprobe(cn, 0));
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}
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/* This is the constab entry for TTYB. */
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int
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zscnprobe_b(struct consdev *cn)
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{
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return (zscnprobe(cn, 1));
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}
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/* Attach as console. Also set zs_conschan */
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int
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zscninit(struct consdev *cn)
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{
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int unit;
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volatile struct zsdevice *addr;
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unit = minor(cn->cn_dev) & 1;
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addr = zsaddr[0];
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zs_conschan = ((unit == 0) ?
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&addr->zs_chan[CHAN_A] :
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&addr->zs_chan[CHAN_B] );
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mon_printf("console on zs0 (tty%c)\n", unit + 'a');
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}
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/*
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* Polled console input putchar.
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*/
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int
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zscngetc(dev)
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dev_t dev;
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{
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register volatile struct zschan *zc = zs_conschan;
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register int s, c;
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if (zc == NULL)
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return (0);
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s = splhigh();
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/* Wait for a character to arrive. */
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while ((zc->zc_csr & ZSRR0_RX_READY) == 0)
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ZS_DELAY();
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ZS_DELAY();
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c = zc->zc_data;
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ZS_DELAY();
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splx(s);
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return (c);
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}
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/*
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* Polled console output putchar.
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*/
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int
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zscnputc(dev, c)
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dev_t dev;
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int c;
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{
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register volatile struct zschan *zc = zs_conschan;
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register int s;
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if (zc == NULL) {
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s = splhigh();
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mon_putchar(c);
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splx(s);
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return (0);
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}
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s = splhigh();
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/* Wait for transmitter to become ready. */
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while ((zc->zc_csr & ZSRR0_TX_READY) == 0)
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ZS_DELAY();
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ZS_DELAY();
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zc->zc_data = c;
|
|
ZS_DELAY();
|
|
splx(s);
|
|
}
|
|
|
|
#ifdef KGDB
|
|
/*
|
|
* The kgdb zs port, if any, was altered at boot time (see zs_kgdb_init).
|
|
* Pick up the current speed and character size and restore the original
|
|
* speed.
|
|
*/
|
|
static void
|
|
zs_checkkgdb(int unit, struct zs_chanstate *cs, struct tty *tp)
|
|
{
|
|
|
|
if (kgdb_dev == makedev(ZSMAJOR, unit)) {
|
|
tp->t_ispeed = tp->t_ospeed = kgdb_rate;
|
|
tp->t_cflag = CS8;
|
|
cs->cs_kgdb = 1;
|
|
cs->cs_speed = zs_kgdb_savedspeed;
|
|
(void) zsparam(tp, &tp->t_termios);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Compute the current baud rate given a ZSCC channel.
|
|
*/
|
|
static int
|
|
zs_getspeed(zc)
|
|
register volatile struct zschan *zc;
|
|
{
|
|
register int tconst;
|
|
|
|
tconst = ZS_READ(zc, 12);
|
|
tconst |= ZS_READ(zc, 13) << 8;
|
|
return (TCONST_TO_BPS(PCLK / 16, tconst));
|
|
}
|
|
|
|
|
|
/*
|
|
* Do an internal open.
|
|
*/
|
|
static void
|
|
zsiopen(struct tty *tp)
|
|
{
|
|
|
|
(void) zsparam(tp, &tp->t_termios);
|
|
ttsetwater(tp);
|
|
tp->t_state = TS_ISOPEN | TS_CARR_ON;
|
|
}
|
|
|
|
/*
|
|
* Do an internal close. Eventually we should shut off the chip when both
|
|
* ports on it are closed.
|
|
*/
|
|
static void
|
|
zsiclose(struct tty *tp)
|
|
{
|
|
|
|
ttylclose(tp, 0); /* ??? */
|
|
ttyclose(tp); /* ??? */
|
|
tp->t_state = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Open a zs serial port. This interface may not be used to open
|
|
* the keyboard and mouse ports. (XXX)
|
|
*/
|
|
int
|
|
zsopen(dev_t dev, int flags, int mode, struct proc *p)
|
|
{
|
|
register struct tty *tp;
|
|
register struct zs_chanstate *cs;
|
|
struct zsinfo *zi;
|
|
int unit = minor(dev), zs = unit >> 1, error, s;
|
|
|
|
#ifdef DEBUG
|
|
mon_printf("zs_open\n");
|
|
#endif
|
|
if (zs >= zscd.cd_ndevs || (zi = zscd.cd_devs[zs]) == NULL ||
|
|
unit == ZS_KBD || unit == ZS_MOUSE)
|
|
return (ENXIO);
|
|
cs = &zi->zi_cs[unit & 1];
|
|
#if 0
|
|
/* The kd driver avoids the need for this hack. */
|
|
if (cs->cs_consio)
|
|
return (ENXIO); /* ??? */
|
|
#endif
|
|
tp = cs->cs_ttyp;
|
|
s = spltty();
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
ttychars(tp);
|
|
if (tp->t_ispeed == 0) {
|
|
tp->t_iflag = TTYDEF_IFLAG;
|
|
tp->t_oflag = TTYDEF_OFLAG;
|
|
#if 0
|
|
tp->t_cflag = TTYDEF_CFLAG;
|
|
#else
|
|
/* Make default same as PROM uses. */
|
|
tp->t_cflag = (CREAD | CS8 | HUPCL);
|
|
#endif
|
|
tp->t_lflag = TTYDEF_LFLAG;
|
|
tp->t_ispeed = tp->t_ospeed = cs->cs_speed;
|
|
}
|
|
(void) zsparam(tp, &tp->t_termios);
|
|
ttsetwater(tp);
|
|
} else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0) {
|
|
splx(s);
|
|
return (EBUSY);
|
|
}
|
|
error = 0;
|
|
#ifdef DEBUG
|
|
mon_printf("wait for carrier...\n");
|
|
#endif
|
|
for (;;) {
|
|
/* loop, turning on the device, until carrier present */
|
|
zs_modem(cs, 1);
|
|
/* May never get status intr if carrier already on. -gwr */
|
|
if (cs->cs_zc->zc_csr & ZSRR0_DCD)
|
|
tp->t_state |= TS_CARR_ON;
|
|
if (cs->cs_softcar)
|
|
tp->t_state |= TS_CARR_ON;
|
|
if (flags & O_NONBLOCK || tp->t_cflag & CLOCAL ||
|
|
tp->t_state & TS_CARR_ON)
|
|
break;
|
|
tp->t_state |= TS_WOPEN;
|
|
if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
|
|
ttopen, 0))
|
|
break;
|
|
}
|
|
#ifdef DEBUG
|
|
mon_printf("...carrier %s\n",
|
|
(tp->t_state & TS_CARR_ON) ? "on" : "off");
|
|
#endif
|
|
splx(s);
|
|
if (error == 0)
|
|
error = linesw[tp->t_line].l_open(dev, tp);
|
|
if (error)
|
|
zs_modem(cs, 0);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Close a zs serial port.
|
|
*/
|
|
int
|
|
zsclose(dev_t dev, int flags, int mode, struct proc *p)
|
|
{
|
|
register struct zs_chanstate *cs;
|
|
register struct tty *tp;
|
|
struct zsinfo *zi;
|
|
int unit = minor(dev), s;
|
|
|
|
#ifdef DEBUG
|
|
mon_printf("zs_close\n");
|
|
#endif
|
|
zi = zscd.cd_devs[unit >> 1];
|
|
cs = &zi->zi_cs[unit & 1];
|
|
tp = cs->cs_ttyp;
|
|
linesw[tp->t_line].l_close(tp, flags);
|
|
if (tp->t_cflag & HUPCL || tp->t_state & TS_WOPEN ||
|
|
(tp->t_state & TS_ISOPEN) == 0) {
|
|
zs_modem(cs, 0);
|
|
/* hold low for 1 second */
|
|
(void) tsleep((caddr_t)cs, TTIPRI, ttclos, hz);
|
|
}
|
|
if (cs->cs_creg[5] & ZSWR5_BREAK)
|
|
{
|
|
s = splzs();
|
|
cs->cs_preg[5] &= ~ZSWR5_BREAK;
|
|
cs->cs_creg[5] &= ~ZSWR5_BREAK;
|
|
ZS_WRITE(cs->cs_zc, 5, cs->cs_creg[5]);
|
|
splx(s);
|
|
}
|
|
ttyclose(tp);
|
|
#ifdef KGDB
|
|
/* Reset the speed if we're doing kgdb on this port */
|
|
if (cs->cs_kgdb) {
|
|
tp->t_ispeed = tp->t_ospeed = kgdb_rate;
|
|
(void) zsparam(tp, &tp->t_termios);
|
|
}
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Read/write zs serial port.
|
|
*/
|
|
int
|
|
zsread(dev_t dev, struct uio *uio, int flags)
|
|
{
|
|
register struct tty *tp = zs_tty[minor(dev)];
|
|
|
|
return (linesw[tp->t_line].l_read(tp, uio, flags));
|
|
}
|
|
|
|
int
|
|
zswrite(dev_t dev, struct uio *uio, int flags)
|
|
{
|
|
register struct tty *tp = zs_tty[minor(dev)];
|
|
|
|
return (linesw[tp->t_line].l_write(tp, uio, flags));
|
|
}
|
|
|
|
/*
|
|
* ZS hardware interrupt. Scan all ZS channels. NB: we know here that
|
|
* channels are kept in (A,B) pairs.
|
|
*
|
|
* Do just a little, then get out; set a software interrupt if more
|
|
* work is needed.
|
|
*
|
|
* We deliberately ignore the vectoring Zilog gives us, and match up
|
|
* only the number of `reset interrupt under service' operations, not
|
|
* the order.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
zshard(int intrarg)
|
|
{
|
|
register struct zs_chanstate *a;
|
|
#define b (a + 1)
|
|
register volatile struct zschan *zc;
|
|
register int rr3, intflags = 0, v, i;
|
|
static int zsrint(struct zs_chanstate *, volatile struct zschan *);
|
|
static int zsxint(struct zs_chanstate *, volatile struct zschan *);
|
|
static int zssint(struct zs_chanstate *, volatile struct zschan *);
|
|
|
|
for (a = zslist; a != NULL; a = b->cs_next) {
|
|
rr3 = ZS_READ(a->cs_zc, 3);
|
|
|
|
/* XXX - This should loop to empty the on-chip fifo. */
|
|
if (rr3 & (ZSRR3_IP_A_RX|ZSRR3_IP_A_TX|ZSRR3_IP_A_STAT)) {
|
|
intflags |= 2;
|
|
zc = a->cs_zc;
|
|
i = a->cs_rbput;
|
|
if (rr3 & ZSRR3_IP_A_RX && (v = zsrint(a, zc)) != 0) {
|
|
a->cs_rbuf[i++ & ZLRB_RING_MASK] = v;
|
|
intflags |= 1;
|
|
}
|
|
if (rr3 & ZSRR3_IP_A_TX && (v = zsxint(a, zc)) != 0) {
|
|
a->cs_rbuf[i++ & ZLRB_RING_MASK] = v;
|
|
intflags |= 1;
|
|
}
|
|
if (rr3 & ZSRR3_IP_A_STAT && (v = zssint(a, zc)) != 0) {
|
|
a->cs_rbuf[i++ & ZLRB_RING_MASK] = v;
|
|
intflags |= 1;
|
|
}
|
|
a->cs_rbput = i;
|
|
}
|
|
|
|
/* XXX - This should loop to empty the on-chip fifo. */
|
|
if (rr3 & (ZSRR3_IP_B_RX|ZSRR3_IP_B_TX|ZSRR3_IP_B_STAT)) {
|
|
intflags |= 2;
|
|
zc = b->cs_zc;
|
|
i = b->cs_rbput;
|
|
if (rr3 & ZSRR3_IP_B_RX && (v = zsrint(b, zc)) != 0) {
|
|
b->cs_rbuf[i++ & ZLRB_RING_MASK] = v;
|
|
intflags |= 1;
|
|
}
|
|
if (rr3 & ZSRR3_IP_B_TX && (v = zsxint(b, zc)) != 0) {
|
|
b->cs_rbuf[i++ & ZLRB_RING_MASK] = v;
|
|
intflags |= 1;
|
|
}
|
|
if (rr3 & ZSRR3_IP_B_STAT && (v = zssint(b, zc)) != 0) {
|
|
b->cs_rbuf[i++ & ZLRB_RING_MASK] = v;
|
|
intflags |= 1;
|
|
}
|
|
b->cs_rbput = i;
|
|
}
|
|
}
|
|
#undef b
|
|
if (intflags & 1) {
|
|
if (zssoftpending == 0) {
|
|
zssoftpending = ZSSOFT_PRI;
|
|
isr_soft_request(ZSSOFT_PRI);
|
|
}
|
|
}
|
|
return (intflags & 2);
|
|
}
|
|
|
|
static int
|
|
zsrint(register struct zs_chanstate *cs, register volatile struct zschan *zc)
|
|
{
|
|
register int c = zc->zc_data;
|
|
|
|
if (cs->cs_conk) {
|
|
register struct conk_state *conk = &zsconk_state;
|
|
|
|
/*
|
|
* Check here for console abort function, so that we
|
|
* can abort even when interrupts are locking up the
|
|
* machine.
|
|
*/
|
|
if (c == KBD_RESET) {
|
|
conk->conk_id = 1; /* ignore next byte */
|
|
conk->conk_l1 = 0;
|
|
} else if (conk->conk_id)
|
|
conk->conk_id = 0; /* stop ignoring bytes */
|
|
else if (c == KBD_L1)
|
|
conk->conk_l1 = 1; /* L1 went down */
|
|
else if (c == (KBD_L1|KBD_UP))
|
|
conk->conk_l1 = 0; /* L1 went up */
|
|
else if (c == KBD_A && conk->conk_l1) {
|
|
zsabort();
|
|
conk->conk_l1 = 0; /* we never see the up */
|
|
goto clearit; /* eat the A after L1-A */
|
|
}
|
|
}
|
|
#ifdef KGDB
|
|
if (c == FRAME_START && cs->cs_kgdb &&
|
|
(cs->cs_ttyp->t_state & TS_ISOPEN) == 0) {
|
|
zskgdb(cs->cs_unit);
|
|
goto clearit;
|
|
}
|
|
#endif
|
|
/* compose receive character and status */
|
|
c <<= 8;
|
|
c |= ZS_READ(zc, 1);
|
|
|
|
/* clear receive error & interrupt condition */
|
|
zc->zc_csr = ZSWR0_RESET_ERRORS;
|
|
zc->zc_csr = ZSWR0_CLR_INTR;
|
|
|
|
return (ZRING_MAKE(ZRING_RINT, c));
|
|
|
|
clearit:
|
|
zc->zc_csr = ZSWR0_RESET_ERRORS;
|
|
zc->zc_csr = ZSWR0_CLR_INTR;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
zsxint(register struct zs_chanstate *cs, register volatile struct zschan *zc)
|
|
{
|
|
register int i = cs->cs_tbc;
|
|
|
|
if (i == 0) {
|
|
zc->zc_csr = ZSWR0_RESET_TXINT;
|
|
zc->zc_csr = ZSWR0_CLR_INTR;
|
|
return (ZRING_MAKE(ZRING_XINT, 0));
|
|
}
|
|
cs->cs_tbc = i - 1;
|
|
zc->zc_data = *cs->cs_tba++;
|
|
zc->zc_csr = ZSWR0_CLR_INTR;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
zssint(register struct zs_chanstate *cs, register volatile struct zschan *zc)
|
|
{
|
|
register int rr0;
|
|
|
|
rr0 = zc->zc_csr;
|
|
zc->zc_csr = ZSWR0_RESET_STATUS;
|
|
zc->zc_csr = ZSWR0_CLR_INTR;
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (rr0 & ZSRR0_DCD) {
|
|
if (cs->cs_ttyp->t_cflag & CCTS_OFLOW &&
|
|
(cs->cs_creg[3] & ZSWR3_HFC) == 0) {
|
|
cs->cs_creg[3] |= ZSWR3_HFC;
|
|
ZS_WRITE(zc, 3, cs->cs_creg[3]);
|
|
}
|
|
} else {
|
|
if (cs->cs_creg[3] & ZSWR3_HFC) {
|
|
cs->cs_creg[3] &= ~ZSWR3_HFC;
|
|
ZS_WRITE(zc, 3, cs->cs_creg[3]);
|
|
}
|
|
}
|
|
if ((rr0 & ZSRR0_BREAK) && cs->cs_brkabort) {
|
|
/* Wait for end of break to avoid PROM abort. */
|
|
while (zc->zc_csr & ZSRR0_BREAK)
|
|
ZS_DELAY();
|
|
zsabort();
|
|
return (0);
|
|
}
|
|
return (ZRING_MAKE(ZRING_SINT, rr0));
|
|
}
|
|
|
|
zsabort()
|
|
{
|
|
#ifdef DDB
|
|
Debugger();
|
|
#else
|
|
printf("stopping on keyboard abort\n");
|
|
sun3_rom_abort();
|
|
#endif
|
|
}
|
|
|
|
#ifdef KGDB
|
|
/*
|
|
* KGDB framing character received: enter kernel debugger. This probably
|
|
* should time out after a few seconds to avoid hanging on spurious input.
|
|
*/
|
|
zskgdb(int unit)
|
|
{
|
|
|
|
printf("zs%d%c: kgdb interrupt\n", unit >> 1, (unit & 1) + 'a');
|
|
kgdb_connect(1);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Print out a ring or fifo overrun error message.
|
|
*/
|
|
static void
|
|
zsoverrun(int unit, long *ptime, char *what)
|
|
{
|
|
|
|
if (*ptime != time.tv_sec) {
|
|
*ptime = time.tv_sec;
|
|
log(LOG_WARNING, "zs%d%c: %s overrun\n", unit >> 1,
|
|
(unit & 1) + 'a', what);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ZS software interrupt. Scan all channels for deferred interrupts.
|
|
*/
|
|
int
|
|
zssoft(int arg)
|
|
{
|
|
register struct zs_chanstate *cs;
|
|
register volatile struct zschan *zc;
|
|
register struct linesw *line;
|
|
register struct tty *tp;
|
|
register int get, n, c, cc, unit, s;
|
|
|
|
if (zssoftpending == 0)
|
|
return (0);
|
|
|
|
zssoftpending = 0;
|
|
isr_soft_clear(ZSSOFT_PRI);
|
|
|
|
for (cs = zslist; cs != NULL; cs = cs->cs_next) {
|
|
get = cs->cs_rbget;
|
|
again:
|
|
n = cs->cs_rbput; /* atomic */
|
|
if (get == n) /* nothing more on this line */
|
|
continue;
|
|
unit = cs->cs_unit; /* set up to handle interrupts */
|
|
zc = cs->cs_zc;
|
|
tp = cs->cs_ttyp;
|
|
line = &linesw[tp->t_line];
|
|
/*
|
|
* Compute the number of interrupts in the receive ring.
|
|
* If the count is overlarge, we lost some events, and
|
|
* must advance to the first valid one. It may get
|
|
* overwritten if more data are arriving, but this is
|
|
* too expensive to check and gains nothing (we already
|
|
* lost out; all we can do at this point is trade one
|
|
* kind of loss for another).
|
|
*/
|
|
n -= get;
|
|
if (n > ZLRB_RING_SIZE) {
|
|
zsoverrun(unit, &cs->cs_rotime, "ring");
|
|
get += n - ZLRB_RING_SIZE;
|
|
n = ZLRB_RING_SIZE;
|
|
}
|
|
while (--n >= 0) {
|
|
/* race to keep ahead of incoming interrupts */
|
|
c = cs->cs_rbuf[get++ & ZLRB_RING_MASK];
|
|
switch (ZRING_TYPE(c)) {
|
|
|
|
case ZRING_RINT:
|
|
c = ZRING_VALUE(c);
|
|
if (c & ZSRR1_DO)
|
|
zsoverrun(unit, &cs->cs_fotime, "fifo");
|
|
cc = c >> 8;
|
|
if (c & ZSRR1_FE)
|
|
cc |= TTY_FE;
|
|
if (c & ZSRR1_PE)
|
|
cc |= TTY_PE;
|
|
/*
|
|
* this should be done through
|
|
* bstreams XXX gag choke
|
|
*/
|
|
if (unit == ZS_KBD)
|
|
kbd_rint(cc);
|
|
else if (unit == ZS_MOUSE)
|
|
ms_rint(cc);
|
|
else
|
|
line->l_rint(cc, tp);
|
|
break;
|
|
|
|
case ZRING_XINT:
|
|
/*
|
|
* Transmit done: change registers and resume,
|
|
* or clear BUSY.
|
|
*/
|
|
if (cs->cs_heldchange) {
|
|
s = splzs();
|
|
c = zc->zc_csr;
|
|
if ((c & ZSRR0_DCD) == 0)
|
|
cs->cs_preg[3] &= ~ZSWR3_HFC;
|
|
bcopy((caddr_t)cs->cs_preg,
|
|
(caddr_t)cs->cs_creg, 16);
|
|
zs_loadchannelregs(zc, cs->cs_creg);
|
|
splx(s);
|
|
cs->cs_heldchange = 0;
|
|
if (cs->cs_heldtbc &&
|
|
(tp->t_state & TS_TTSTOP) == 0) {
|
|
cs->cs_tbc = cs->cs_heldtbc - 1;
|
|
zc->zc_data = *cs->cs_tba++;
|
|
goto again;
|
|
}
|
|
}
|
|
tp->t_state &= ~TS_BUSY;
|
|
if (tp->t_state & TS_FLUSH)
|
|
tp->t_state &= ~TS_FLUSH;
|
|
else
|
|
ndflush(&tp->t_outq, cs->cs_tba -
|
|
(caddr_t) tp->t_outq.c_cf);
|
|
line->l_start(tp);
|
|
break;
|
|
|
|
case ZRING_SINT:
|
|
/*
|
|
* Status line change. HFC bit is run in
|
|
* hardware interrupt, to avoid locking
|
|
* at splzs here.
|
|
*/
|
|
c = ZRING_VALUE(c);
|
|
if ((c ^ cs->cs_rr0) & ZSRR0_DCD) {
|
|
cc = (c & ZSRR0_DCD) != 0;
|
|
if (line->l_modem(tp, cc) == 0)
|
|
zs_modem(cs, cc);
|
|
}
|
|
cs->cs_rr0 = c;
|
|
break;
|
|
|
|
default:
|
|
log(LOG_ERR, "zs%d%c: bad ZRING_TYPE (%x)\n",
|
|
unit >> 1, (unit & 1) + 'a', c);
|
|
break;
|
|
}
|
|
}
|
|
cs->cs_rbget = get;
|
|
goto again;
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
zsioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
|
|
{
|
|
int unit = minor(dev);
|
|
struct zsinfo *zi = zscd.cd_devs[unit >> 1];
|
|
register struct zs_chanstate *cs = &zi->zi_cs[unit & 1];
|
|
register struct tty *tp = cs->cs_ttyp;
|
|
register int error, s;
|
|
|
|
error = linesw[tp->t_line].l_ioctl(tp, cmd, data, flag, p);
|
|
if (error >= 0)
|
|
return (error);
|
|
error = ttioctl(tp, cmd, data, flag, p);
|
|
if (error >= 0)
|
|
return (error);
|
|
|
|
switch (cmd) {
|
|
|
|
case TIOCSBRK:
|
|
{
|
|
s = splzs();
|
|
cs->cs_preg[5] |= ZSWR5_BREAK;
|
|
cs->cs_creg[5] |= ZSWR5_BREAK;
|
|
ZS_WRITE(cs->cs_zc, 5, cs->cs_creg[5]);
|
|
splx(s);
|
|
break;
|
|
}
|
|
|
|
case TIOCCBRK:
|
|
{
|
|
s = splzs();
|
|
cs->cs_preg[5] &= ~ZSWR5_BREAK;
|
|
cs->cs_creg[5] &= ~ZSWR5_BREAK;
|
|
ZS_WRITE(cs->cs_zc, 5, cs->cs_creg[5]);
|
|
splx(s);
|
|
break;
|
|
}
|
|
|
|
case TIOCSDTR:
|
|
|
|
case TIOCCDTR:
|
|
|
|
case TIOCMSET:
|
|
|
|
case TIOCMBIS:
|
|
|
|
case TIOCMBIC:
|
|
|
|
case TIOCMGET:
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Start or restart transmission.
|
|
*/
|
|
static void
|
|
zsstart(register struct tty *tp)
|
|
{
|
|
register struct zs_chanstate *cs;
|
|
register int s, nch;
|
|
int unit = minor(tp->t_dev);
|
|
struct zsinfo *zi = zscd.cd_devs[unit >> 1];
|
|
|
|
cs = &zi->zi_cs[unit & 1];
|
|
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(cs->cs_zc, 1, cs->cs_creg[1]);
|
|
cs->cs_zc->zc_data = *p;
|
|
cs->cs_tba = p + 1;
|
|
cs->cs_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(cs->cs_zc, 1, cs->cs_creg[1]);
|
|
}
|
|
out:
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Stop output, e.g., for ^S or output flush.
|
|
*/
|
|
void
|
|
zsstop(register struct tty *tp, int flag)
|
|
{
|
|
register struct zs_chanstate *cs;
|
|
register int s, unit = minor(tp->t_dev);
|
|
struct zsinfo *zi = zscd.cd_devs[unit >> 1];
|
|
|
|
cs = &zi->zi_cs[unit & 1];
|
|
s = splzs();
|
|
if (tp->t_state & TS_BUSY) {
|
|
/*
|
|
* Device is transmitting; must stop it.
|
|
*/
|
|
cs->cs_tbc = 0;
|
|
if ((tp->t_state & TS_TTSTOP) == 0)
|
|
tp->t_state |= TS_FLUSH;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Set ZS tty parameters from termios.
|
|
*
|
|
* This routine makes use of the fact that only registers
|
|
* 1, 3, 4, 5, 9, 10, 11, 12, 13, 14, and 15 are written.
|
|
*/
|
|
static int
|
|
zsparam(register struct tty *tp, register struct termios *t)
|
|
{
|
|
int unit = minor(tp->t_dev);
|
|
struct zsinfo *zi = zscd.cd_devs[unit >> 1];
|
|
register struct zs_chanstate *cs = &zi->zi_cs[unit & 1];
|
|
register int tmp, tmp5, cflag, s;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
tmp = t->c_ospeed;
|
|
if (tmp < 0 || (t->c_ispeed && t->c_ispeed != tmp))
|
|
return (EINVAL);
|
|
if (tmp == 0) {
|
|
/* stty 0 => drop DTR and RTS */
|
|
zs_modem(cs, 0);
|
|
return (0);
|
|
}
|
|
tmp = BPS_TO_TCONST(PCLK / 16, tmp);
|
|
if (tmp < 2)
|
|
return (EINVAL);
|
|
|
|
cflag = t->c_cflag;
|
|
tp->t_ispeed = tp->t_ospeed = TCONST_TO_BPS(PCLK / 16, tmp);
|
|
tp->t_cflag = cflag;
|
|
|
|
/*
|
|
* Block interrupts so that state will not
|
|
* be altered until we are done setting it up.
|
|
*/
|
|
s = splzs();
|
|
cs->cs_preg[12] = tmp;
|
|
cs->cs_preg[13] = tmp >> 8;
|
|
cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE;
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
tmp = ZSWR3_RX_5;
|
|
tmp5 = ZSWR5_TX_5;
|
|
break;
|
|
case CS6:
|
|
tmp = ZSWR3_RX_6;
|
|
tmp5 = ZSWR5_TX_6;
|
|
break;
|
|
case CS7:
|
|
tmp = ZSWR3_RX_7;
|
|
tmp5 = ZSWR5_TX_7;
|
|
break;
|
|
case CS8:
|
|
default:
|
|
tmp = 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.
|
|
*/
|
|
if (cflag & CCTS_OFLOW && cs->cs_zc->zc_csr & ZSRR0_DCD)
|
|
tmp |= ZSWR3_HFC | ZSWR3_RX_ENABLE;
|
|
else
|
|
tmp |= ZSWR3_RX_ENABLE;
|
|
cs->cs_preg[3] = tmp;
|
|
cs->cs_preg[5] = tmp5 | ZSWR5_TX_ENABLE | ZSWR5_DTR | ZSWR5_RTS;
|
|
|
|
tmp = ZSWR4_CLK_X16 | (cflag & CSTOPB ? ZSWR4_TWOSB : ZSWR4_ONESB);
|
|
if ((cflag & PARODD) == 0)
|
|
tmp |= ZSWR4_EVENP;
|
|
if (cflag & PARENB)
|
|
tmp |= ZSWR4_PARENB;
|
|
cs->cs_preg[4] = tmp;
|
|
cs->cs_preg[9] = ZSWR9_MASTER_IE | ZSWR9_NO_VECTOR;
|
|
cs->cs_preg[10] = ZSWR10_NRZ;
|
|
cs->cs_preg[11] = ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD;
|
|
cs->cs_preg[14] = ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA;
|
|
cs->cs_preg[15] = ZSWR15_BREAK_IE | ZSWR15_DCD_IE;
|
|
|
|
/*
|
|
* If nothing is being transmitted, set up new current values,
|
|
* else mark them as pending.
|
|
*/
|
|
if (cs->cs_heldchange == 0) {
|
|
if (cs->cs_ttyp->t_state & TS_BUSY) {
|
|
cs->cs_heldtbc = cs->cs_tbc;
|
|
cs->cs_tbc = 0;
|
|
cs->cs_heldchange = 1;
|
|
} else {
|
|
bcopy((caddr_t)cs->cs_preg, (caddr_t)cs->cs_creg, 16);
|
|
zs_loadchannelregs(cs->cs_zc, cs->cs_creg);
|
|
}
|
|
}
|
|
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(struct zs_chanstate *cs, int onoff)
|
|
{
|
|
int s, bis, and;
|
|
|
|
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 (cs->cs_ttyp->t_state & TS_BUSY) {
|
|
cs->cs_heldtbc = cs->cs_tbc;
|
|
cs->cs_tbc = 0;
|
|
cs->cs_heldchange = 1;
|
|
} else {
|
|
cs->cs_creg[5] = (cs->cs_creg[5] | bis) & and;
|
|
ZS_WRITE(cs->cs_zc, 5, cs->cs_creg[5]);
|
|
}
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Write the given register set to the given zs channel in the proper order.
|
|
* The channel must not be transmitting at the time. The receiver will
|
|
* be disabled for the time it takes to write all the registers.
|
|
*/
|
|
static void
|
|
zs_loadchannelregs(volatile struct zschan *zc, u_char *reg)
|
|
{
|
|
int i;
|
|
|
|
zc->zc_csr = ZSM_RESET_ERR; /* reset error condition */
|
|
i = zc->zc_data; /* drain fifo */
|
|
i = zc->zc_data;
|
|
i = zc->zc_data;
|
|
ZS_WRITE(zc, 4, reg[4]);
|
|
ZS_WRITE(zc, 10, reg[10]);
|
|
ZS_WRITE(zc, 3, reg[3] & ~ZSWR3_RX_ENABLE);
|
|
ZS_WRITE(zc, 5, reg[5] & ~ZSWR5_TX_ENABLE);
|
|
ZS_WRITE(zc, 1, reg[1]);
|
|
ZS_WRITE(zc, 9, reg[9]);
|
|
ZS_WRITE(zc, 11, reg[11]);
|
|
ZS_WRITE(zc, 12, reg[12]);
|
|
ZS_WRITE(zc, 13, reg[13]);
|
|
ZS_WRITE(zc, 14, reg[14]);
|
|
ZS_WRITE(zc, 15, reg[15]);
|
|
ZS_WRITE(zc, 3, reg[3]);
|
|
ZS_WRITE(zc, 5, reg[5]);
|
|
}
|
|
|
|
static u_char
|
|
zs_read(zc, reg)
|
|
volatile struct zschan *zc;
|
|
u_char reg;
|
|
{
|
|
u_char val;
|
|
|
|
zc->zc_csr = reg;
|
|
ZS_DELAY();
|
|
val = zc->zc_csr;
|
|
ZS_DELAY();
|
|
return val;
|
|
}
|
|
|
|
static u_char
|
|
zs_write(zc, reg, val)
|
|
volatile struct zschan *zc;
|
|
u_char reg, val;
|
|
{
|
|
zc->zc_csr = reg;
|
|
ZS_DELAY();
|
|
zc->zc_csr = val;
|
|
ZS_DELAY();
|
|
return val;
|
|
}
|
|
|
|
#ifdef KGDB
|
|
/*
|
|
* Get a character from the given kgdb channel. Called at splhigh().
|
|
* XXX - Add delays, or combine with zscngetc()...
|
|
*/
|
|
static int
|
|
zs_kgdb_getc(void *arg)
|
|
{
|
|
register volatile struct zschan *zc = (volatile struct zschan *)arg;
|
|
|
|
while ((zc->zc_csr & ZSRR0_RX_READY) == 0)
|
|
continue;
|
|
return (zc->zc_data);
|
|
}
|
|
|
|
/*
|
|
* Put a character to the given kgdb channel. Called at splhigh().
|
|
*/
|
|
static void
|
|
zs_kgdb_putc(void *arg, int c)
|
|
{
|
|
register volatile struct zschan *zc = (volatile struct zschan *)arg;
|
|
|
|
while ((zc->zc_csr & ZSRR0_TX_READY) == 0)
|
|
continue;
|
|
zc->zc_data = c;
|
|
}
|
|
|
|
/*
|
|
* Set up for kgdb; called at boot time before configuration.
|
|
* KGDB interrupts will be enabled later when zs0 is configured.
|
|
*/
|
|
void
|
|
zs_kgdb_init()
|
|
{
|
|
volatile struct zsdevice *addr;
|
|
volatile struct zschan *zc;
|
|
int unit, zs;
|
|
|
|
if (major(kgdb_dev) != ZSMAJOR)
|
|
return;
|
|
unit = minor(kgdb_dev);
|
|
/*
|
|
* Unit must be 0 or 1 (zs0).
|
|
*/
|
|
if ((unsigned)unit >= ZS_KBD) {
|
|
printf("zs_kgdb_init: bad minor dev %d\n", unit);
|
|
return;
|
|
}
|
|
zs = unit >> 1;
|
|
unit &= 1;
|
|
|
|
if (zsaddr[0] == NULL)
|
|
panic("kbdb_attach: zs0 not yet mapped");
|
|
addr = zsaddr[0];
|
|
|
|
zc = unit == 0 ? &addr->zs_chan[CHAN_A] : &addr->zs_chan[CHAN_B];
|
|
zs_kgdb_savedspeed = zs_getspeed(zc);
|
|
printf("zs_kgdb_init: attaching zs%d%c at %d baud\n",
|
|
zs, unit + 'a', kgdb_rate);
|
|
zs_reset(zc, 1, kgdb_rate);
|
|
kgdb_attach(zs_kgdb_getc, zs_kgdb_putc, (void *)zc);
|
|
}
|
|
#endif /* KGDB */
|