zs.c

早期freebsd实现

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)zs.c	8.1 (Berkeley) 7/19/93
 *
 * from: $Header: zs.c,v 1.30 93/07/19 23:44:42 torek Exp $
 */

/*
 * Zilog Z8530 (ZSCC) driver.
 *
 * Runs two tty ports (ttya and ttyb) on zs0,
 * and runs a keyboard and mouse on zs1.
 *
 * This driver knows far too much about chip to usage mappings.
 */
#define	NZS	2		/* XXX */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>

#include <machine/autoconf.h>
#include <machine/cpu.h>

#include <sparc/sparc/vaddrs.h>
#include <sparc/sparc/auxreg.h>

#include <sparc/dev/kbd.h>
#include <sparc/dev/zsreg.h>
#include <sparc/dev/zsvar.h>

#ifdef KGDB
#include <machine/remote-sl.h>
#endif

#define	ZSMAJOR	12		/* XXX */

#define	ZS_KBD		2	/* XXX */
#define	ZS_MOUSE	3	/* XXX */

/* the magic number below was stolen from the Sprite source. */
#define PCLK	(19660800/4)	/* PCLK pin input clock rate */

/*
 * Select software interrupt bit based on TTY ipl.
 */
#if PIL_TTY == 1
# define IE_ZSSOFT IE_L1
#elif PIL_TTY == 4
# define IE_ZSSOFT IE_L4
#elif PIL_TTY == 6
# define IE_ZSSOFT IE_L6
#else
# error "no suitable software interrupt bit"
#endif

/*
 * Software state per found chip.  This would be called `zs_softc',
 * but the previous driver had a rather different zs_softc....
 */
struct zsinfo {
	struct	device zi_dev;		/* base device */
	volatile struct zsdevice *zi_zs;/* chip registers */
	struct	zs_chanstate zi_cs[2];	/* channel A and B software state */
};

struct tty zs_tty[NZS * 2];		/* XXX should be dynamic */

/* Definition of the driver for autoconfig. */
static int	zsmatch(struct device *, struct cfdata *, void *);
static void	zsattach(struct device *, struct device *, void *);
struct cfdriver zscd =
    { NULL, "zs", zsmatch, zsattach, DV_TTY, sizeof(struct zsinfo) };

/* Interrupt handlers. */
static int	zshard(void *);
static struct intrhand levelhard = { zshard };
static int	zssoft(void *);
static struct intrhand levelsoft = { zssoft };

struct zs_chanstate *zslist;

/* Routines called from other code. */
static void	zsiopen(struct tty *);
static void	zsiclose(struct tty *);
static void	zsstart(struct tty *);
static void	zsstop(struct tty *, int);
static int	zsparam(struct tty *, struct termios *);

/* Routines purely local to this driver. */
static int	zs_getspeed(volatile struct zschan *);
static void	zs_reset(volatile struct zschan *, int, int);
static void	zs_modem(struct zs_chanstate *, int);
static void	zs_loadchannelregs(volatile struct zschan *, u_char *);

/* Console stuff. */
static struct tty *zs_ctty;	/* console `struct tty *' */
static int zs_consin = -1, zs_consout = -1;
static int zscnputc(int);	/* console putc function */
static volatile struct zschan *zs_conschan;
static struct tty *zs_checkcons(struct zsinfo *, int, struct zs_chanstate *);

#ifdef KGDB
/* KGDB stuff.  Must reboot to change zs_kgdbunit. */
extern int kgdb_dev, kgdb_rate;
static int zs_kgdb_savedspeed;
static void zs_checkkgdb(int, struct zs_chanstate *, struct tty *);
#endif

extern volatile struct zsdevice *findzs(int);
static volatile struct zsdevice *zsaddr[NZS];	/* XXX, but saves work */

/*
 * Console keyboard L1-A processing is done in the hardware interrupt code,
 * so we need to duplicate some of the console keyboard decode state.  (We
 * must not use the regular state as the hardware code keeps ahead of the
 * software state: the software state tracks the most recent ring input but
 * the hardware state tracks the most recent ZSCC input.)  See also kbd.h.
 */
static struct conk_state {	/* console keyboard state */
	char	conk_id;	/* true => ID coming up (console only) */
	char	conk_l1;	/* true => L1 pressed (console only) */
} zsconk_state;

int zshardscope;
int zsshortcuts;		/* number of "shortcut" software interrupts */

/*
 * Match slave number to zs unit number, so that misconfiguration will
 * not set up the keyboard as ttya, etc.
 */
static int
zsmatch(struct device *parent, struct cfdata *cf, void *aux)
{
	struct romaux *ra = aux;

	return (getpropint(ra->ra_node, "slave", -2) == cf->cf_unit);
}

/*
 * Attach a found zs.
 *
 * USE ROM PROPERTIES port-a-ignore-cd AND port-b-ignore-cd FOR
 * SOFT CARRIER, AND keyboard PROPERTY FOR KEYBOARD/MOUSE?
 */
static void
zsattach(struct device *parent, struct device *dev, void *aux)
{
	register int zs = dev->dv_unit, unit;
	register struct zsinfo *zi;
	register struct zs_chanstate *cs;
	register volatile struct zsdevice *addr;
	register struct tty *tp, *ctp;
	register struct romaux *ra = aux;
	int pri, softcar;
	static int didintr, prevpri;

	if ((addr = zsaddr[zs]) == NULL)
		addr = zsaddr[zs] = findzs(zs);
	if ((void *)addr != ra->ra_vaddr)
		panic("zsattach");
	if (ra->ra_nintr != 1) {
		printf(": expected 1 interrupt, got %d\n", ra->ra_nintr);
		return;
	}
	pri = ra->ra_intr[0].int_pri;
	printf(" pri %d, softpri %d\n", pri, PIL_TTY);
	if (!didintr) {
		didintr = 1;
		prevpri = pri;
		intr_establish(pri, &levelhard);
		intr_establish(PIL_TTY, &levelsoft);
	} else if (pri != prevpri)
		panic("broken zs interrupt scheme");
	zi = (struct zsinfo *)dev;
	zi->zi_zs = addr;
	unit = zs * 2;
	cs = zi->zi_cs;
	tp = &zs_tty[unit];

	if (unit == 0) {
		/* Get software carrier flags from options node in OPENPROM. */
		extern int optionsnode;

		softcar = 0;
		if (*getpropstring(optionsnode, "ttya-ignore-cd") == 't')
			softcar |= 1;
		if (*getpropstring(optionsnode, "ttyb-ignore-cd") == 't')
			softcar |= 2;
	} else
		softcar = dev->dv_cfdata->cf_flags;

	/* link into interrupt list with order (A,B) (B=A+1) */
	cs[0].cs_next = &cs[1];
	cs[1].cs_next = zslist;
	zslist = cs;

	cs->cs_unit = unit;
	cs->cs_speed = zs_getspeed(&addr->zs_chan[CHAN_A]);
	cs->cs_softcar = softcar & 1;
	cs->cs_zc = &addr->zs_chan[CHAN_A];
	tp->t_dev = makedev(ZSMAJOR, unit);
	tp->t_oproc = zsstart;
	tp->t_param = zsparam;
	tp->t_stop = zsstop;
	if ((ctp = zs_checkcons(zi, unit, cs)) != NULL)
		tp = ctp;
	cs->cs_ttyp = tp;
#ifdef KGDB
	if (ctp == NULL)
		zs_checkkgdb(unit, cs, tp);
#endif
	if (unit == ZS_KBD) {
		/*
		 * Keyboard: tell /dev/kbd driver how to talk to us.
		 */
		tp->t_ispeed = tp->t_ospeed = cs->cs_speed;
		tp->t_cflag = CS8;
		kbd_serial(tp, zsiopen, zsiclose);
		cs->cs_conk = 1;		/* do L1-A processing */
	}
	unit++;
	cs++;
	tp = &zs_tty[unit];
	cs->cs_unit = unit;
	cs->cs_speed = zs_getspeed(&addr->zs_chan[CHAN_B]);
	cs->cs_softcar = softcar & 2;
	cs->cs_zc = &addr->zs_chan[CHAN_B];
	tp->t_dev = makedev(ZSMAJOR, unit);
	tp->t_oproc = zsstart;
	tp->t_param = zsparam;
	tp->t_stop = zsstop;
	if ((ctp = zs_checkcons(zi, unit, cs)) != NULL)
		tp = ctp;
	cs->cs_ttyp = tp;
#ifdef KGDB
	if (ctp == NULL)
		zs_checkkgdb(unit, cs, tp);
#endif
	if (unit == ZS_MOUSE) {
		/*
		 * Mouse: tell /dev/mouse driver how to talk to us.
		 */
		tp->t_ispeed = tp->t_ospeed = cs->cs_speed;
		tp->t_cflag = CS8;
		ms_serial(tp, zsiopen, zsiclose);
	}
}

/*
 * Put a channel in a known state.  Interrupts may be left disabled
 * or enabled, as desired.
 */
static void
zs_reset(zc, inten, speed)
	volatile struct zschan *zc;
	int inten, speed;
{
	int tconst;
	static u_char reg[16] = {
		0,
		0,
		0,
		ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
		ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
		ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
		0,
		0,
		0,
		0,
		ZSWR10_NRZ,
		ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
		0,
		0,
		ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA,
		ZSWR15_BREAK_IE | ZSWR15_DCD_IE,
	};

	reg[9] = inten ? ZSWR9_MASTER_IE | ZSWR9_NO_VECTOR : ZSWR9_NO_VECTOR;
	tconst = BPS_TO_TCONST(PCLK / 16, speed);
	reg[12] = tconst;
	reg[13] = tconst >> 8;
	zs_loadchannelregs(zc, reg);
}

/*
 * Declare the given tty (which is in fact &cons) as a console input
 * or output.  This happens before the zs chip is attached; the hookup
 * is finished later, in zs_setcons() below.
 *
 * This is used only for ports a and b.  The console keyboard is decoded
 * independently (we always send unit-2 input to /dev/kbd, which will
 * direct it to /dev/console if appropriate).
 */
void
zsconsole(tp, unit, out)
	register struct tty *tp;
	register int unit;
	int out;
{
	extern int (*v_putc)();
	int zs;
	volatile struct zsdevice *addr;

	if (unit >= ZS_KBD)
		panic("zsconsole");
	if (out) {
		zs_consout = unit;
		zs = unit >> 1;
		if ((addr = zsaddr[zs]) == NULL)
			addr = zsaddr[zs] = findzs(zs);
		zs_conschan = (unit & 1) == 0 ? &addr->zs_chan[CHAN_A] :
		    &addr->zs_chan[CHAN_B];
		v_putc = zscnputc;
	} else
		zs_consin = unit;
	zs_ctty = tp;
}

/*
 * Polled console output putchar.
 */
static int
zscnputc(c)
	int c;
{
	register volatile struct zschan *zc = zs_conschan;
	register int s;

	if (c == '\n')
		zscnputc('\r');
	/*
	 * Must block output interrupts (i.e., raise to >= splzs) without
	 * lowering current ipl.  Need a better way.
	 */
	s = splhigh();
#ifdef sun4c		/* XXX */
	if (s <= (12 << 8))
		(void) splzs();
#endif
	while ((zc->zc_csr & ZSRR0_TX_READY) == 0)
		continue;
	zc->zc_data = c;
	splx(s);
}

/*
 * Set up the given unit as console input, output, both, or neither, as
 * needed.  Return console tty if it is to receive console input.
 */
static struct tty *
zs_checkcons(struct zsinfo *zi, int unit, struct zs_chanstate *cs)
{
	register struct tty *tp;
	char *i, *o;

	if ((tp = zs_ctty) == NULL)
		return (0);
	i = zs_consin == unit ? "input" : NULL;
	o = zs_consout == unit ? "output" : NULL;
	if (i == NULL && o == NULL)
		return (0);

	/* rewire the minor device (gack) */
	tp->t_dev = makedev(major(tp->t_dev), unit);

	/*
	 * Rewire input and/or output.  Note that baud rate reflects
	 * input settings, not output settings, but we can do no better
	 * if the console is split across two ports.
	 *
	 * XXX	split consoles don't work anyway -- this needs to be
	 *	thrown away and redone
	 */
	if (i) {
		tp->t_param = zsparam;
		tp->t_ispeed = tp->t_ospeed = cs->cs_speed;
		tp->t_cflag = CS8;
		ttsetwater(tp);
	}
	if (o) {
		tp->t_oproc = zsstart;
		tp->t_stop = zsstop;
	}
	printf("%s%c: console %s\n",