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NetBSD/sys/arch/pmax/tc/scc.c

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/* $NetBSD: scc.c,v 1.28 1997/07/21 05:39:41 jonathan Exp $ */
/*
* Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University
* All rights reserved.
*
* Author: Chris G. Demetriou and Jonathan Stone
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell and Rick Macklem.
*
* 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.
*
* @(#)scc.c 8.2 (Berkeley) 11/30/93
*/
/*
* Intel 82530 dual usart chip driver. Supports the serial port(s) on the
* Personal DECstation 5000/xx and DECstation 5000/1xx, plus the keyboard
* and mouse on the 5000/1xx. (Don't ask me where the A channel signals
* are on the 5000/xx.)
*
* See: Intel MicroCommunications Handbook, Section 2, pg. 155-173, 1992.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/map.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/device.h>
#ifndef pmax
#include <dev/cons.h>
#endif
#include <pmax/include/pmioctl.h>
#include <pmax/dev/pdma.h>
#include <dev/ic/z8530reg.h>
#include <pmax/dev/lk201.h>
#include <pmax/dev/lk201var.h>
#ifdef pmax
#include <mips/cpuregs.h> /* phys to uncached */
#include <pmax/pmax/cons.h>
#include <pmax/pmax/pmaxtype.h>
#include <pmax/pmax/maxine.h>
#include <pmax/pmax/asic.h>
#include <pmax/dev/sccreg.h>
#include <pmax/tc/sccvar.h> /* XXX */
#endif
#ifdef alpha
#include <alpha/tc/sccreg.h>
#include <alpha/tc/sccvar.h>
#include <machine/rpb.h>
#include <alpha/tc/ioasicreg.h>
#endif
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/conf.h>
#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicvar.h>
#include "rasterconsole.h"
extern void ttrstrt __P((void *));
#ifdef alpha
#undef SCCDEV
#define SCCDEV 15 /* XXX */
#endif
/*
* rcons glass-tty console (as used on pmax) needs lk-201 ASCII input
* support from the tty drivers. This is ugly and broken and won't
* compile on Alphas.
*/
#if defined (pmax)
#if NRASTERCONSOLE > 0
#define HAVE_RCONS
#endif
extern int pending_remcons;
#endif
/*
* True iff the console unit is diverted throught this SCC device.
* (used to just test if cn_tab->cn_getc was sccGetc, but that
* breaks with the new-style glass-tty framebuffer console input.
*/
#define CONSOLE_ON_UNIT(unit) \
(major(cn_tab->cn_dev) == SCCDEV && SCCUNIT(cn_tab->cn_dev) == (unit))
#ifdef alpha
#define RASTER_CONSOLE() 1 /* Treat test for cn_screen as true */
#endif
/*
* Is there a framebuffer console device using this serial driver?
* XXX used for ugly special-cased console input that should be redone
* more cleanly.
*/
static inline int
raster_console(void)
{
return (cn_tab->cn_pri == CN_NORMAL || cn_tab->cn_pri == CN_INTERNAL);
}
#define SCCUNIT(dev) (minor(dev) >> 1)
#define SCCLINE(dev) (minor(dev) & 0x1)
/* QVSS-compatible in-kernel X input event parser, pointer tracker */
void (*sccDivertXInput) __P((int cc)); /* X windows keyboard input routine */
void (*sccMouseEvent) __P((int)); /* X windows mouse motion event routine */
void (*sccMouseButtons) __P((int)); /* X windows mouse buttons event routine */
#ifdef DEBUG
int debugChar;
#endif
struct scc_softc {
struct device sc_dv;
struct pdma scc_pdma[2];
struct {
u_char wr1;
u_char wr3;
u_char wr4;
u_char wr5;
u_char wr14;
} scc_wreg[2];
struct tty *scc_tty[2];
int scc_softCAR;
int scc_flags[2];
#define SCC_CHAN_NEEDSDELAY 0x01 /* sw must delay 1.6us between output*/
#define SCC_CHAN_NOMODEM 0x02 /* don't touch modem ctl lines (may
be left floating or x-wired */
#define SCC_CHAN_MODEM_CROSSED 0x04 /* modem lines wired to other channel*/
#define SCC_CHAN_KBDLINE 0x08 /* XXX special-case keyboard lines */
int scc_unitflags; /* flags for both channels, e.g. */
#define SCC_PREFERRED_CONSOLE 0x01
};
/*
* BRG formula is:
* ClockFrequency
* BRGconstant = --------------------------- - 2
* 2 * BaudRate * ClockDivider
*
* Speed selections with Pclk=7.3728Mhz, clock x16
*/
struct speedtab sccspeedtab[] = {
{ 0, 0, },
{ 50, 4606, },
{ 75, 3070, },
{ 110, 2093, },
{ 134.5, 1711, },
{ 150, 1534, },
{ 200, 1150, },
{ 300, 766, },
{ 600, 382, },
{ 1200, 190, },
{ 1800, 126, },
{ 2400, 94, },
{ 4800, 46, },
{ 7200, 30, }, /* non-POSIX */
{ 9600, 22, },
{ 14400, 14, }, /* non-POSIX */
{ 19200, 10, },
{ 28800, 6, }, /* non-POSIX */
{ 38400, 4, }, /* non-POSIX */
{ 57600, 2, }, /* non-POSIX */
{ 76800, 1, }, /* non-POSIX, doesn't work reliably */
{ 115200, 0 }, /* non-POSIX doesn't work reliably */
{ -1, -1, },
};
#if 0
/* speed selections with clock x1 */
{
{ 0, 0 },
{ 300, 24574 },
{ 300, 12286 },
{ 600, 6142 },
{ 1200, 3070 },
{ 2400, 1534 },
{ 4800, 766 },
{ 7200, 510 },
{ 9600, 382 },
{ 14400, 254 },
{ 19200, 190 },
{ 28800, 126 },
{ 38400, 94 },
{ 57600, 62, },
{ 76800, 46, },
{ 115200, 30 },
{ 204800, 16 },
{ 230400, 14 },
}
#endif
#ifndef PORTSELECTOR
#define ISPEED TTYDEF_SPEED
#define LFLAG TTYDEF_LFLAG
#else
#define ISPEED B4800
#define LFLAG (TTYDEF_LFLAG & ~ECHO)
#endif
/* Definition of the driver for autoconfig. */
static int sccmatch __P((struct device *parent, struct cfdata *cf,
void *aux));
static void sccattach __P((struct device *parent, struct device *self,
void *aux));
struct cfattach scc_ca = {
sizeof (struct scc_softc), sccmatch, sccattach,
};
struct cfdriver scc_cd = {
NULL, "scc", DV_TTY,
};
int sccGetc __P((dev_t));
void sccPutc __P((dev_t, int));
void sccPollc __P((dev_t, int));
int sccparam __P((struct tty *, struct termios *));
void sccstart __P((struct tty *));
int sccmctl __P((dev_t, int, int));
static int cold_sccparam __P((struct tty *, struct termios *,
struct scc_softc *sc));
#ifdef SCC_DEBUG
static void rr __P((char *, scc_regmap_t *));
#endif
static void scc_modem_intr __P((dev_t));
static void sccreset __P((struct scc_softc *));
int sccintr __P((void *));
#ifdef alpha
void scc_alphaintr __P((int));
#endif
/*
* console variables, for using serial console while still cold and
* autoconfig has not attached the scc device.
*/
extern int cold;
scc_regmap_t *scc_cons_addr = 0;
static struct scc_softc coldcons_softc;
static struct consdev scccons = {
NULL, NULL, sccGetc, sccPutc, sccPollc, NODEV, 0
};
void scc_consinit __P((dev_t dev, scc_regmap_t *sccaddr));
void scc_oconsinit __P((struct scc_softc *sc, dev_t dev));
/*
* Set up a given unit as a serial console device.
* We need console output when cold, and before any device is configured.
* Should be callable when cold, to reset the chip and set parameters
* for a remote (serial) console or kgdb line.
* XXX
* As most DECstations only bring out one rs-232 lead from an SCC
* to the bulkhead, and use the other for mouse and keyboard, we
* only allow one unit per SCC to be console.
*/
void
scc_consinit(dev, sccaddr)
dev_t dev;
scc_regmap_t *sccaddr;
{
struct scc_softc *sc;
struct termios cterm;
struct tty ctty;
int s;
/* Save address in case we're cold. */
if (cold && scc_cons_addr == 0) {
scc_cons_addr = sccaddr;
sc = &coldcons_softc;
coldcons_softc.scc_pdma[0].p_addr = sccaddr;
coldcons_softc.scc_pdma[1].p_addr = sccaddr;
} else {
/* being called from sccattach() to reset console */
sc = scc_cd.cd_devs[SCCUNIT(dev)];
}
/* Reset chip. */
sccreset(sc);
/* XXX make sure sccreset() called only once for this chip? */
/* set console-line parameters */
s = spltty();
ctty.t_dev = dev;
scccons.cn_dev = dev;
cterm.c_cflag = CS8;
#ifdef pmax
/* XXX -- why on pmax, not on Alpha? */
cterm.c_cflag |= CLOCAL;
#endif
cterm.c_ospeed = cterm.c_ispeed = 9600;
(void) cold_sccparam(&ctty, &cterm, sc);
*cn_tab = scccons;
DELAY(1000);
splx(s);
}
void
scc_oconsinit(sc, dev)
struct scc_softc *sc;
dev_t dev;
{
struct termios cterm;
struct tty ctty;
int s;
s = spltty();
ctty.t_dev = dev;
cterm.c_cflag = CS8;
#ifdef pmax
/* XXX -- why on pmax, not on Alpha? */
cterm.c_cflag |= CLOCAL;
#endif
cterm.c_ospeed = cterm.c_ispeed = 9600;
(void) sccparam(&ctty, &cterm);
DELAY(1000);
splx(s);
}
/*
* Test to see if device is present.
* Return true if found.
*/
int
sccmatch(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct ioasicdev_attach_args *d = aux;
void *sccaddr;
if (parent->dv_cfdata->cf_driver != &ioasic_cd) {
#ifdef DIAGNOSTIC
printf("Cannot attach scc on %s\n", parent->dv_xname);
#endif
return (0);
}
/* Make sure that we're looking for this type of device. */
if ((strncmp(d->iada_modname, "z8530 ", TC_ROM_LLEN) != 0) &&
(strncmp(d->iada_modname, "scc", TC_ROM_LLEN)!= 0))
return (0);
/*
* Check user-specified offset against the ioasic offset.
* Allow it to be wildcarded.
*/
if (cf->cf_loc[IOASICCF_OFFSET] != IOASICCF_OFFSET_DEFAULT &&
cf->cf_loc[IOASICCF_OFFSET] != d->iada_offset)
return (0);
/* Get the address, and check it for validity. */
sccaddr = (void *)d->iada_addr;
#ifdef SPARSE
sccaddr = (void *)TC_DENSE_TO_SPARSE((tc_addr_t)sccaddr);
#endif
if (badaddr(sccaddr, 2))
return (0);
return (1);
}
#ifdef alpha
/*
* Enable ioasic SCC interrupts and scc DMA engine interrupts.
* XXX does not really belong here.
*/
void
scc_alphaintr(onoff)
int onoff;
{
if (onoff) {
*(volatile u_int *)IOASIC_REG_IMSK(ioasic_base) |=
IOASIC_INTR_SCC_1 | IOASIC_INTR_SCC_0;
#if !defined(DEC_3000_300) && defined(SCC_DMA)
*(volatile u_int *)IOASIC_REG_CSR(ioasic_base) |=
IOASIC_CSR_DMAEN_T1 | IOASIC_CSR_DMAEN_R1 |
IOASIC_CSR_DMAEN_T2 | IOASIC_CSR_DMAEN_R2;
#endif
} else {
*(volatile u_int *)IOASIC_REG_IMSK(ioasic_base) &=
~(IOASIC_INTR_SCC_1 | IOASIC_INTR_SCC_0);
#if !defined(DEC_3000_300) && defined(SCC_DMA)
*(volatile u_int *)IOASIC_REG_CSR(ioasic_base) &=
~(IOASIC_CSR_DMAEN_T1 | IOASIC_CSR_DMAEN_R1 |
IOASIC_CSR_DMAEN_T2 | IOASIC_CSR_DMAEN_R2);
#endif
}
alpha_mb();
}
#endif /*alpha*/
void
sccattach(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
struct scc_softc *sc = (struct scc_softc *)self;
struct ioasicdev_attach_args *d = aux;
struct pdma *pdp;
struct tty *tp;
void *sccaddr;
int cntr;
struct termios cterm;
struct tty ctty;
int s;
extern int cputype;
int unit, flags;
unit = sc->sc_dv.dv_unit;
flags = sc->sc_dv.dv_cfdata->cf_flags;
/* serial console debugging */
#if defined(DEBUG) && defined(HAVE_RCONS) && 0
if (CONSOLE_ON_UNIT(unit) && (cn_tab->cn_pri == CN_REMOTE))
printf("\nattaching scc%d, currently PROM console\n", unit);
#endif /* defined(DEBUG) && defined(HAVE_RCONS)*/
sccaddr = (void*)MIPS_PHYS_TO_KSEG1(d->iada_addr);
#ifdef SPARSE
sccaddr = (void *)TC_DENSE_TO_SPARSE((tc_addr_t)sccaddr);
#endif
/* Register the interrupt handler. */
ioasic_intr_establish(parent, d->iada_cookie, TC_IPL_TTY,
sccintr, (void *)sc);
/* serial console debugging */
#if defined(DEBUG) && defined(HAVE_RCONS) && 0 /*XXX*/
if (CONSOLE_ON_UNIT(unit) && (cn_tab->cn_pri == CN_REMOTE)) {
DELAY(10000);
printf("(attached interrupt, delaying)\n");
}
#endif /* defined(DEBUG) && defined(HAVE_RCONS)*/
/*
* For a remote console, wait a while for previous output to
* complete.
*/
#ifdef pmax
if (CONSOLE_ON_UNIT(unit) && (cn_tab->cn_pri == CN_REMOTE))
DELAY(10000);
#endif
#ifdef alpha
if ((cputype == ST_DEC_3000_500 && sc->sc_dv.dv_unit == 1) ||
(cputype == ST_DEC_3000_300 && sc->sc_dv.dv_unit == 0))
DELAY(10000);
#endif
pdp = &sc->scc_pdma[0];
/* init pseudo DMA structures */
for (cntr = 0; cntr < 2; cntr++) {
pdp->p_addr = (void *)sccaddr;
tp = sc->scc_tty[cntr] = ttymalloc();
if (cputype == DS_MAXINE || cntr == 0)
tty_attach(tp); /* XXX */
pdp->p_arg = (long)tp;
pdp->p_fcn = (void (*)__P((struct tty*)))0;
tp->t_dev = (dev_t)((unit << 1) | cntr);
pdp++;
}
/* What's the warning here? Defaulting to softCAR on line 2? */
sc->scc_softCAR = flags | 0x2; /* XXX */
/* reset chip, initialize register-copies in softc */
sccreset(sc);
/*
* Special handling for consoles.
*/
#ifdef pmax
if (pending_remcons) {
/*
* We were using PROM callbacks for console I/O,
* and we just reset the chip under the console.
* wire up this driver as console ASAP.
*/
/*XXX*/ /* test for correct unit */
DELAY(10000);
/*
* XXX PROM and NetBSD unit numbers swapped
* on kn03, maybe kmin?
* And what about maxine?
*/
if (cn_tab->cn_dev == unit && cputype != DS_MAXINE) {
printf ("\n");
return;
}
/*
* If we are using the PROM serial-console routines
* as console, now is the time to set up the scc
* driver as console.
*/
cn_tab = &scccons;
cn_tab->cn_dev = makedev(SCCDEV,
sc->sc_dv.dv_unit == 0 ? SCCCOMM2_PORT : SCCCOMM3_PORT);
#ifdef notyet
scc_consinit(cn_tab->cn_dev, sccaddr);
#else
scc_oconsinit(sc, cn_tab->cn_dev);
#endif
printf(" (In sccattach: cn_dev = 0x%x)", cn_tab->cn_dev);
printf(" (Unit = %d)", unit);
printf(": console\n");
pending_remcons = 0;
/*
* XXX We should support configurations where the PROM
* console device is a serial console, and a
* framebuffer, keyboard, and mouse are present.
*/
return;
}
#endif /* pmax */
#ifdef HAVE_RCONS
if ((cn_tab->cn_getc == LKgetc)) {
/* XXX test below may be too inclusive ? */
/*(1)*/ /*(CONSOLE_ON_UNIT(unit))*/
if (major(cn_tab->cn_dev) == SCCDEV) {
if (unit == 1) {
s = spltty();
ctty.t_dev = makedev(SCCDEV, SCCKBD_PORT);
cterm.c_cflag = CS8;
#ifdef pmax
/* XXX -- why on pmax, not on Alpha? */
cterm.c_cflag |= CLOCAL;
#endif /* pmax */
cterm.c_ospeed = cterm.c_ispeed = 4800;
(void) sccparam(&ctty, &cterm);
DELAY(10000);
#ifdef notyet
/*
* For some reason doing this hangs the 3min
* during booting. Fortunately the keyboard
* works ok without it.
*/
KBDReset(ctty.t_dev, sccPutc);
#endif /* notyet */
DELAY(10000);
splx(s);
} else if (unit == 0) {
s = spltty();
ctty.t_dev = makedev(SCCDEV, SCCMOUSE_PORT);
cterm.c_cflag = CS8 | PARENB | PARODD;
cterm.c_ospeed = cterm.c_ispeed = 4800;
(void) sccparam(&ctty, &cterm);
#ifdef HAVE_RCONS
DELAY(10000);
MouseInit(ctty.t_dev, sccPutc, sccGetc);
DELAY(10000);
#endif
splx(s);
}
}
} else
#endif /* HAVE_RCONS */
if (SCCUNIT(cn_tab->cn_dev) == unit)
{
/*XXX console initialization used to go here */
}
#ifdef alpha
/*
* XXX
* Unit 1 is the remote console, wire it up now.
*/
if ((cputype == ST_DEC_3000_500 && sc->sc_dv.dv_unit == 1) ||
(cputype == ST_DEC_3000_300 && sc->sc_dv.dv_unit == 0))
{
cn_tab = &scccons;
cn_tab->cn_dev = makedev(SCCDEV, sc->sc_dv.dv_unit * 2);
printf(": console\n");
/* wire carrier for console. */
sc->scc_softCAR |= SCCLINE(cn_tab->cn_dev);
} else
printf("\n");
#endif /* !alpha */
printf("\n");
}
/*
* Reset the chip and the softc state.
* Resetting clobbers chip state and copies of registers for both channels.
* The driver assumes this is only ever called once per unit.
*/
static void
sccreset(sc)
register struct scc_softc *sc;
{
register scc_regmap_t *regs;
register u_char val;
regs = (scc_regmap_t *)sc->scc_pdma[0].p_addr;
/*
* Chip once-only initialization
*
* NOTE: The wiring we assume is the one on the 3min:
*
* out A-TxD --> TxD keybd or mouse
* in A-RxD --> RxD keybd or mouse
* out A-DTR~ --> DTR comm
* out A-RTS~ --> RTS comm
* in A-CTS~ --> SI comm
* in A-DCD~ --> RI comm
* in A-SYNCH~--> DSR comm
* out B-TxD --> TxD comm
* in B-RxD --> RxD comm
* in B-RxC --> TRxCB comm
* in B-TxC --> RTxCB comm
* out B-RTS~ --> SS comm
* in B-CTS~ --> CTS comm
* in B-DCD~ --> CD comm
*/
SCC_INIT_REG(regs, SCC_CHANNEL_A);
SCC_INIT_REG(regs, SCC_CHANNEL_B);
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_WR9, ZSWR9_HARD_RESET);
DELAY(50000); /*enough ? */
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_WR9, 0);
/* program the interrupt vector */
SCC_WRITE_REG(regs, SCC_CHANNEL_A, ZSWR_IVEC, 0xf0);
SCC_WRITE_REG(regs, SCC_CHANNEL_B, ZSWR_IVEC, 0xf0);
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_WR9, ZSWR9_VECTOR_INCL_STAT);
/*
* Set softc copies of writable (write-only?) registers.
*/
/* receive parameters and control */
sc->scc_wreg[SCC_CHANNEL_A].wr3 = 0;
sc->scc_wreg[SCC_CHANNEL_B].wr3 = 0;
/* timing base defaults */
sc->scc_wreg[SCC_CHANNEL_A].wr4 = ZSWR4_CLK_X16;
sc->scc_wreg[SCC_CHANNEL_B].wr4 = ZSWR4_CLK_X16 ;
/* enable DTR, RTS and SS */
#ifdef alpha
/* XXX -- who changed the alpha driver to do this, and why? */
sc->scc_wreg[SCC_CHANNEL_B].wr5 = 0;
#else
sc->scc_wreg[SCC_CHANNEL_B].wr5 = ZSWR5_RTS;
#endif
sc->scc_wreg[SCC_CHANNEL_A].wr5 = ZSWR5_RTS | ZSWR5_DTR;
/* baud rates */
val = ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK;
sc->scc_wreg[SCC_CHANNEL_B].wr14 = val;
sc->scc_wreg[SCC_CHANNEL_A].wr14 = val;
/* interrupt conditions */
val = ZSWR1_RIE | ZSWR1_PE_SC | ZSWR1_SIE | ZSWR1_TIE;
sc->scc_wreg[SCC_CHANNEL_A].wr1 = val;
sc->scc_wreg[SCC_CHANNEL_B].wr1 = val;
}
int
sccopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct scc_softc *sc;
register struct tty *tp;
register int unit, line;
int s, error = 0;
unit = SCCUNIT(dev);
if (unit >= scc_cd.cd_ndevs)
return (ENXIO);
sc = scc_cd.cd_devs[unit];
if (!sc)
return (ENXIO);
line = SCCLINE(dev);
if (sc->scc_pdma[line].p_addr == NULL)
return (ENXIO);
tp = sc->scc_tty[line];
if (tp == NULL) {
tp = sc->scc_tty[line] = ttymalloc();
tty_attach(tp);
}
tp->t_oproc = sccstart;
tp->t_param = sccparam;
tp->t_dev = dev;
if ((tp->t_state & TS_ISOPEN) == 0) {
tp->t_state |= TS_WOPEN;
ttychars(tp);
#ifndef PORTSELECTOR
if (tp->t_ispeed == 0) {
#endif
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_lflag = LFLAG;
tp->t_ispeed = tp->t_ospeed = ISPEED;
#ifdef PORTSELECTOR
tp->t_cflag |= HUPCL;
#else
}
#endif
(void) sccparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if ((tp->t_state & TS_XCLUDE) && curproc->p_ucred->cr_uid != 0)
return (EBUSY);
(void) sccmctl(dev, DML_DTR, DMSET);
s = spltty();
while (!(flag & O_NONBLOCK) && !(tp->t_cflag & CLOCAL) &&
!(tp->t_state & TS_CARR_ON)) {
tp->t_state |= TS_WOPEN;
if ((error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
ttopen, 0)) != 0)
break;
}
splx(s);
if (error)
return (error);
return ((*linesw[tp->t_line].l_open)(dev, tp));
}
/*ARGSUSED*/
int
sccclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct scc_softc *sc = scc_cd.cd_devs[SCCUNIT(dev)];
register struct tty *tp;
register int line;
line = SCCLINE(dev);
tp = sc->scc_tty[line];
if (sc->scc_wreg[line].wr5 & ZSWR5_BREAK) {
sc->scc_wreg[line].wr5 &= ~ZSWR5_BREAK;
ttyoutput(0, tp);
}
(*linesw[tp->t_line].l_close)(tp, flag);
if ((tp->t_cflag & HUPCL) || (tp->t_state & TS_WOPEN) ||
!(tp->t_state & TS_ISOPEN))
(void) sccmctl(dev, 0, DMSET);
return (ttyclose(tp));
}
int
sccread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct scc_softc *sc;
register struct tty *tp;
sc = scc_cd.cd_devs[SCCUNIT(dev)]; /* XXX*/
tp = sc->scc_tty[SCCLINE(dev)];
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
sccwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct scc_softc *sc;
register struct tty *tp;
sc = scc_cd.cd_devs[SCCUNIT(dev)]; /* XXX*/
tp = sc->scc_tty[SCCLINE(dev)];
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
struct tty *
scctty(dev)
dev_t dev;
{
register struct scc_softc *sc;
register struct tty *tp;
register int unit = SCCUNIT(dev);
if ((unit >= scc_cd.cd_ndevs) || (sc = scc_cd.cd_devs[unit]) == 0)
return (0);
tp = sc->scc_tty[SCCLINE(dev)];
return (tp);
}
/*ARGSUSED*/
int
sccioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
register struct scc_softc *sc;
register struct tty *tp;
int error, line;
line = SCCLINE(dev);
sc = scc_cd.cd_devs[SCCUNIT(dev)];
tp = sc->scc_tty[line];
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:
sc->scc_wreg[line].wr5 |= ZSWR5_BREAK;
ttyoutput(0, tp);
break;
case TIOCCBRK:
sc->scc_wreg[line].wr5 &= ~ZSWR5_BREAK;
ttyoutput(0, tp);
break;
case TIOCSDTR:
(void) sccmctl(dev, DML_DTR|DML_RTS, DMBIS);
break;
case TIOCCDTR:
(void) sccmctl(dev, DML_DTR|DML_RTS, DMBIC);
break;
case TIOCMSET:
(void) sccmctl(dev, *(int *)data, DMSET);
break;
case TIOCMBIS:
(void) sccmctl(dev, *(int *)data, DMBIS);
break;
case TIOCMBIC:
(void) sccmctl(dev, *(int *)data, DMBIC);
break;
case TIOCMGET:
*(int *)data = sccmctl(dev, 0, DMGET);
break;
default:
return (ENOTTY);
}
return (0);
}
/*
* Set line parameters -- tty t_param entry point.
*/
int
sccparam(tp, t)
register struct tty *tp;
register struct termios *t;
{
register struct scc_softc *sc;
/* Extract the softc and call cold_sccparam to do all the work. */
sc = scc_cd.cd_devs[SCCUNIT(tp->t_dev)];
return cold_sccparam(tp, t, sc);
}
/*
* Do what sccparam() (t_param entry point) does, but callable when cold.
*/
static int
cold_sccparam(tp, t, sc)
register struct tty *tp;
register struct termios *t;
register struct scc_softc *sc;
{
register scc_regmap_t *regs;
register int line;
register u_char value, wvalue;
register int cflag = t->c_cflag;
int ospeed;
/* Check arguments */
if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
return (EINVAL);
ospeed = ttspeedtab(t->c_ospeed, sccspeedtab);
if (ospeed < 0)
return (EINVAL);
/* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = cflag;
/*
* Handle console specially.
*/
#ifdef HAVE_RCONS
if (cn_tab->cn_getc == LKgetc) {
if (minor(tp->t_dev) == SCCKBD_PORT) {
cflag = CS8;
ospeed = ttspeedtab(4800, sccspeedtab);
} else if (minor(tp->t_dev) == SCCMOUSE_PORT) {
cflag = CS8 | PARENB | PARODD;
ospeed = ttspeedtab(4800, sccspeedtab);
}
} else if (tp->t_dev == cn_tab->cn_dev)
#endif /*HAVE_RCONS*/
{
cflag = CS8;
ospeed = ttspeedtab(9600, sccspeedtab);
}
if (ospeed == 0) {
(void) sccmctl(tp->t_dev, 0, DMSET); /* hang up line */
return (0);
}
line = SCCLINE(tp->t_dev);
regs = (scc_regmap_t *)sc->scc_pdma[line].p_addr;
/*
* pmax driver used to reset the SCC here. That reset causes the
* other channel on the SCC to drop outpur chars: at least that's
* what CGD reports for the Alpha. It's a bug.
*/
#if 0
/* reset line */
if (line == SCC_CHANNEL_A)
value = ZSWR9_A_RESET;
else
value = ZSWR9_B_RESET;
SCC_WRITE_REG(regs, line, SCC_WR9, value);
DELAY(25);
#endif
/* stop bits, normally 1 */
value = sc->scc_wreg[line].wr4 & 0xf0;
if (cflag & CSTOPB)
value |= ZSWR4_TWOSB;
else
value |= ZSWR4_ONESB;
if ((cflag & PARODD) == 0)
value |= ZSWR4_EVENP;
if (cflag & PARENB)
value |= ZSWR4_PARENB;
/* set it now, remember it must be first after reset */
sc->scc_wreg[line].wr4 = value;
SCC_WRITE_REG(regs, line, SCC_WR4, value);
/* vector again */
SCC_WRITE_REG(regs, line, ZSWR_IVEC, 0xf0);
/* clear break, keep rts dtr */
wvalue = sc->scc_wreg[line].wr5 & (ZSWR5_DTR|ZSWR5_RTS);
switch (cflag & CSIZE) {
case CS5:
value = ZSWR3_RX_5;
wvalue |= ZSWR5_TX_5;
break;
case CS6:
value = ZSWR3_RX_6;
wvalue |= ZSWR5_TX_6;
break;
case CS7:
value = ZSWR3_RX_7;
wvalue |= ZSWR5_TX_7;
break;
case CS8:
default:
value = ZSWR3_RX_8;
wvalue |= ZSWR5_TX_8;
};
sc->scc_wreg[line].wr3 = value;
SCC_WRITE_REG(regs, line, SCC_WR3, value);
sc->scc_wreg[line].wr5 = wvalue;
SCC_WRITE_REG(regs, line, SCC_WR5, wvalue);
/*
* XXX Does the SCC chip require us to refresh the WR5 register
* for the other channel after writing the other, or not?
*/
#ifdef notdef
/* XXX */
{
int otherline = (line + 1) & 1;
SCC_WRITE_REG(regs, otherline, SCC_WR5, sc->scc_wreg[otherline].wr5);
}
#endif
SCC_WRITE_REG(regs, line, ZSWR_SYNCLO, 0);
SCC_WRITE_REG(regs, line, ZSWR_SYNCHI, 0);
SCC_WRITE_REG(regs, line, SCC_WR9, ZSWR9_VECTOR_INCL_STAT);
SCC_WRITE_REG(regs, line, SCC_WR10, 0);
value = ZSWR11_RXCLK_BAUD | ZSWR11_TXCLK_BAUD |
ZSWR11_TRXC_OUT_ENA | ZSWR11_TRXC_BAUD;
SCC_WRITE_REG(regs, line, SCC_WR11, value);
SCC_SET_TIMING_BASE(regs, line, ospeed);
value = sc->scc_wreg[line].wr14;
SCC_WRITE_REG(regs, line, SCC_WR14, value);
#ifdef alpha
if (SCCUNIT(tp->t_dev) == 1) {
/* On unit one, on the flamingo, modem control is floating! */
value = ZSWR15_BREAK_IE;
} else
#endif
{
value = ZSWR15_BREAK_IE | ZSWR15_CTS_IE | ZSWR15_DCD_IE;
}
SCC_WRITE_REG(regs, line, SCC_WR15, value);
/* and now the enables */
value = sc->scc_wreg[line].wr3 | ZSWR3_RX_ENABLE;
SCC_WRITE_REG(regs, line, SCC_WR3, value);
value = sc->scc_wreg[line].wr5 | ZSWR5_TX_ENABLE;
sc->scc_wreg[line].wr5 = value;
SCC_WRITE_REG(regs, line, SCC_WR5, value);
/* master inter enable */
value = ZSWR9_MASTER_IE | ZSWR9_VECTOR_INCL_STAT;
SCC_WRITE_REG(regs, line, SCC_WR9, value);
SCC_WRITE_REG(regs, line, SCC_WR1, sc->scc_wreg[line].wr1);
tc_mb();
#ifdef alpha
scc_alphaintr(1); /* XXX XXX XXX */
#endif /*alpha*/
return (0);
}
/*
* Check for interrupts from all devices.
*/
int
sccintr(xxxsc)
void *xxxsc;
{
register struct scc_softc *sc = (struct scc_softc *)xxxsc;
register int unit = (long)sc->sc_dv.dv_unit;
register scc_regmap_t *regs;
register struct tty *tp;
register struct pdma *dp;
register int cc, chan, rr1, rr2, rr3;
int overrun = 0;
rr1 = 0; /* shut up gcc -Wall */
regs = (scc_regmap_t *)sc->scc_pdma[0].p_addr;
unit <<= 1;
for (;;) {
SCC_READ_REG(regs, SCC_CHANNEL_B, ZSRR_IVEC, rr2);
rr2 = SCC_RR2_STATUS(rr2);
/* are we done yet ? */
if (rr2 == 6) { /* strange, distinguished value */
SCC_READ_REG(regs, SCC_CHANNEL_A, ZSRR_IPEND, rr3);
if (rr3 == 0)
return 0 ;/* XXX FIXME why ? */
}
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_RR0, ZSWR0_CLR_INTR);
if ((rr2 == SCC_RR2_A_XMIT_DONE) || (rr2 == SCC_RR2_B_XMIT_DONE)) {
chan = (rr2 == SCC_RR2_A_XMIT_DONE) ?
SCC_CHANNEL_A : SCC_CHANNEL_B;
tp = sc->scc_tty[chan];
dp = &sc->scc_pdma[chan];
if (dp->p_mem < dp->p_end) {
SCC_WRITE_DATA(regs, chan, *dp->p_mem++);
#ifdef pmax /* Alpha handles the 1.6 msec settle time in hardware */
DELAY(2);
#endif
tc_mb();
} else {
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_FLUSH)
tp->t_state &= ~TS_FLUSH;
else {
ndflush(&tp->t_outq, dp->p_mem -
(caddr_t) tp->t_outq.c_cf);
dp->p_end = dp->p_mem = tp->t_outq.c_cf;
}
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
sccstart(tp);
if (tp->t_outq.c_cc == 0 || !(tp->t_state & TS_BUSY)) {
SCC_READ_REG(regs, chan, SCC_RR15, cc);
cc &= ~ZSWR15_TXUEOM_IE;
SCC_WRITE_REG(regs, chan, SCC_WR15, cc);
cc = sc->scc_wreg[chan].wr1 & ~ZSWR1_TIE;
SCC_WRITE_REG(regs, chan, SCC_WR1, cc);
sc->scc_wreg[chan].wr1 = cc;
tc_mb();
}
}
} else if (rr2 == SCC_RR2_A_RECV_DONE ||
rr2 == SCC_RR2_B_RECV_DONE || rr2 == SCC_RR2_A_RECV_SPECIAL ||
rr2 == SCC_RR2_B_RECV_SPECIAL) {
if (rr2 == SCC_RR2_A_RECV_DONE || rr2 == SCC_RR2_A_RECV_SPECIAL)
chan = SCC_CHANNEL_A;
else
chan = SCC_CHANNEL_B;
tp = sc->scc_tty[chan];
SCC_READ_DATA(regs, chan, cc);
if (rr2 == SCC_RR2_A_RECV_SPECIAL ||
rr2 == SCC_RR2_B_RECV_SPECIAL) {
SCC_READ_REG(regs, chan, SCC_RR1, rr1);
SCC_WRITE_REG(regs, chan, SCC_RR0, ZSWR0_RESET_ERRORS);
if ((rr1 & ZSRR1_DO) && overrun == 0) {
log(LOG_WARNING, "scc%d,%d: silo overflow\n",
unit >> 1, chan);
overrun = 1;
}
}
/*
* Keyboard needs special treatment.
*/
if (tp == scctty(makedev(SCCDEV, SCCKBD_PORT)) &&
raster_console()) {
#ifdef DDB
if (cc == LK_DO) {
spl0();
Debugger();
return -1;
}
#endif
#ifdef DEBUG
debugChar = cc;
#endif
if (sccDivertXInput) {
(*sccDivertXInput)(cc);
continue;
}
#ifdef HAVE_RCONS
if ((cc = kbdMapChar(cc)) < 0)
continue;
#endif
/*
* Now for mousey
*/
} else if (tp == scctty(makedev(SCCDEV, SCCMOUSE_PORT)) &&
sccMouseButtons) {
#ifdef HAVE_RCONS
/*XXX*/
mouseInput(cc);
continue;
#endif
}
if (!(tp->t_state & TS_ISOPEN)) {
wakeup((caddr_t)&tp->t_rawq);
#ifdef PORTSELECTOR
if (!(tp->t_state & TS_WOPEN))
#endif
continue;
}
if (rr2 == SCC_RR2_A_RECV_SPECIAL ||
rr2 == SCC_RR2_B_RECV_SPECIAL) {
if (rr1 & ZSRR1_PE)
cc |= TTY_PE;
if (rr1 & ZSRR1_FE)
cc |= TTY_FE;
}
(*linesw[tp->t_line].l_rint)(cc, tp);
} else if ((rr2 == SCC_RR2_A_EXT_STATUS) || (rr2 == SCC_RR2_B_EXT_STATUS)) {
chan = (rr2 == SCC_RR2_A_EXT_STATUS) ?
SCC_CHANNEL_A : SCC_CHANNEL_B;
SCC_WRITE_REG(regs, chan, SCC_RR0, ZSWR0_RESET_STATUS);
scc_modem_intr(unit | chan);
}
}
}
void
sccstart(tp)
register struct tty *tp;
{
register struct pdma *dp;
register scc_regmap_t *regs;
register struct scc_softc *sc;
register int cc, chan;
u_char temp;
int s, sendone;
sc = scc_cd.cd_devs[SCCUNIT(tp->t_dev)];
dp = &sc->scc_pdma[SCCLINE(tp->t_dev)];
regs = (scc_regmap_t *)dp->p_addr;
s = spltty();
if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
goto out;
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);
}
if (tp->t_outq.c_cc == 0)
goto out;
/* handle console specially */
if (tp == scctty(makedev(SCCDEV,SCCKBD_PORT)) && raster_console()) {
while (tp->t_outq.c_cc > 0) {
cc = getc(&tp->t_outq) & 0x7f;
cnputc(cc);
}
/*
* After we flush the output queue we may need to wake
* up the process that made the output.
*/
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);
}
goto out;
}
cc = ndqb(&tp->t_outq, 0);
tp->t_state |= TS_BUSY;
dp->p_end = dp->p_mem = tp->t_outq.c_cf;
dp->p_end += cc;
/*
* Enable transmission and send the first char, as required.
*/
chan = SCCLINE(tp->t_dev);
SCC_READ_REG(regs, chan, SCC_RR0, temp);
sendone = (temp & ZSRR0_TX_READY);
SCC_READ_REG(regs, chan, SCC_RR15, temp);
temp |= ZSWR15_TXUEOM_IE;
SCC_WRITE_REG(regs, chan, SCC_WR15, temp);
temp = sc->scc_wreg[chan].wr1 | ZSWR1_TIE;
SCC_WRITE_REG(regs, chan, SCC_WR1, temp);
sc->scc_wreg[chan].wr1 = temp;
if (sendone) {
#ifdef DIAGNOSTIC
if (cc == 0)
panic("sccstart: No chars");
#endif
SCC_WRITE_DATA(regs, chan, *dp->p_mem++);
#ifdef pmax /* Alpha handles the 1.6 msec settle time in hardware */
DELAY(2);
#endif
}
tc_mb();
out:
splx(s);
}
/*
* Stop output on a line.
*/
/*ARGSUSED*/
void
sccstop(tp, flag)
register struct tty *tp;
int flag;
{
register struct pdma *dp;
register struct scc_softc *sc;
register int s;
sc = scc_cd.cd_devs[SCCUNIT(tp->t_dev)];
dp = &sc->scc_pdma[SCCLINE(tp->t_dev)];
s = spltty();
if (tp->t_state & TS_BUSY) {
dp->p_end = dp->p_mem;
if (!(tp->t_state & TS_TTSTOP))
tp->t_state |= TS_FLUSH;
}
splx(s);
}
int
sccmctl(dev, bits, how)
dev_t dev;
int bits, how;
{
register struct scc_softc *sc;
register scc_regmap_t *regs;
register int line, mbits;
register u_char value;
int s;
sc = scc_cd.cd_devs[SCCUNIT(dev)];
line = SCCLINE(dev);
regs = (scc_regmap_t *)sc->scc_pdma[line].p_addr;
s = spltty();
/*
* only channel B has modem control, however the DTR and RTS
* pins on the comm port are wired to the DTR and RTS A channel
* signals.
*/
mbits = DML_DTR | DML_DSR | DML_CAR;
if (line == SCC_CHANNEL_B) {
if (sc->scc_wreg[SCC_CHANNEL_A].wr5 & ZSWR5_DTR)
mbits = DML_DTR | DML_DSR;
else
mbits = 0;
SCC_READ_REG_ZERO(regs, SCC_CHANNEL_B, value);
if (value & ZSRR0_DCD)
mbits |= DML_CAR;
}
switch (how) {
case DMSET:
mbits = bits;
break;
case DMBIS:
mbits |= bits;
break;
case DMBIC:
mbits &= ~bits;
break;
case DMGET:
(void) splx(s);
return (mbits);
}
if (line == SCC_CHANNEL_B) {
if (mbits & DML_DTR)
sc->scc_wreg[SCC_CHANNEL_A].wr5 |= ZSWR5_DTR;
else
sc->scc_wreg[SCC_CHANNEL_A].wr5 &= ~ZSWR5_DTR;
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_WR5,
sc->scc_wreg[SCC_CHANNEL_A].wr5);
}
if ((mbits & DML_DTR) || (sc->scc_softCAR & (1 << line)))
sc->scc_tty[line]->t_state |= TS_CARR_ON;
(void) splx(s);
return (mbits);
}
/*
* Check for carrier transition.
*/
static void
scc_modem_intr(dev)
dev_t dev;
{
register scc_regmap_t *regs;
register struct scc_softc *sc;
register struct tty *tp;
register int car, chan;
register u_char value;
int s;
chan = SCCLINE(dev);
sc = scc_cd.cd_devs[SCCUNIT(dev)];
tp = sc->scc_tty[chan];
regs = (scc_regmap_t *)sc->scc_pdma[chan].p_addr;
if (chan == SCC_CHANNEL_A)
return;
s = spltty();
SCC_READ_REG_ZERO(regs, chan, value);
if (sc->scc_softCAR & (1 << chan))
car = 1;
else {
car = value & ZSRR0_DCD;
}
/* Break on serial console drops into the dbeugger */
if ((value & ZSRR0_BREAK) && CONSOLE_ON_UNIT(sc->sc_dv.dv_unit)) {
#ifdef DDB
splx(s); /* spl0()? */
Debugger();
return;
#else
/* XXX maybe fall back to PROM? */
#endif
}
/*
* The pmax driver follows carrier-detect. The Alpha does not.
* XXX Why doesn't the Alpha driver follow carrier-detect?
* (in the Alpha driver, this is an "#ifdef notdef").
* Is it related to console handling?
*
* Ignore hups on a console tty.
*/
#ifndef alpha
if (!CONSOLE_ON_UNIT(sc->sc_dv.dv_unit)) {
if (car) {
/* carrier present */
if (!(tp->t_state & TS_CARR_ON))
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
} else if (tp->t_state & TS_CARR_ON)
(void)(*linesw[tp->t_line].l_modem)(tp, 0);
}
#endif
splx(s);
}
/*
* Get a char off the appropriate line via. a busy wait loop.
*/
int
sccGetc(dev)
dev_t dev;
{
register scc_regmap_t *regs;
register int c, line;
register u_char value;
int s;
line = SCCLINE(dev);
if (cold && scc_cons_addr) {
regs = scc_cons_addr;
} else {
register struct scc_softc *sc;
sc = scc_cd.cd_devs[SCCUNIT(dev)];
regs = (scc_regmap_t *)sc->scc_pdma[line].p_addr;
}
if (!regs)
return (0);
#ifdef pmax
/*s = spltty(); */ /* XXX why different spls? */
s = splhigh();
#else
s = splhigh();
#endif
for (;;) {
SCC_READ_REG(regs, line, SCC_RR0, value);
if (value & ZSRR0_RX_READY) {
SCC_READ_REG(regs, line, SCC_RR1, value);
SCC_READ_DATA(regs, line, c);
if (value & (ZSRR1_PE | ZSRR1_DO | ZSRR1_FE)) {
SCC_WRITE_REG(regs, line, SCC_WR0,
ZSWR0_RESET_ERRORS);
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_WR0,
ZSWR0_CLR_INTR);
} else {
SCC_WRITE_REG(regs, SCC_CHANNEL_A, SCC_WR0,
ZSWR0_CLR_INTR);
splx(s);
return (c & 0xff);
}
} else
DELAY(10);
}
}
/*
* Send a char on a port, via a busy wait loop.
*/
void
sccPutc(dev, c)
dev_t dev;
int c;
{
register scc_regmap_t *regs;
register int line;
register u_char value;
int s;
#ifdef pmax
s = spltty(); /* XXX why different spls? */
#else
s = splhigh();
#endif
line = SCCLINE(dev);
if (cold && scc_cons_addr) {
regs = scc_cons_addr;
} else {
register struct scc_softc *sc;
sc = scc_cd.cd_devs[SCCUNIT(dev)];
regs = (scc_regmap_t *)sc->scc_pdma[line].p_addr;
}
/*
* Wait for transmitter to be not busy.
*/
do {
SCC_READ_REG(regs, line, SCC_RR0, value);
if (value & ZSRR0_TX_READY)
break;
DELAY(100);
} while (1);
/*
* Send the char.
*/
SCC_WRITE_DATA(regs, line, c);
tc_mb();
splx(s);
return;
}
/*
* Enable/disable polling mode
*/
void
sccPollc(dev, on)
dev_t dev;
int on;
{
}
#ifdef SCC_DEBUG
static void
rr(msg, regs)
char *msg;
scc_regmap_t *regs;
{
u_char value;
int r0, r1, r2, r3, r10, r15;
printf("%s: register: %lx\n", msg, regs);
#define L(reg, r) { \
SCC_READ_REG(regs, SCC_CHANNEL_A, reg, value); \
r = value; \
}
L(SCC_RR0, r0);
L(SCC_RR1, r1);
L(ZSRR_IVEC, r2);
L(ZSRR_IPEND, r3);
L(SCC_RR10, r10);
L(SCC_RR15, r15);
printf("A: 0: %x 1: %x 2(vec): %x 3: %x 10: %x 15: %x\n",
r0, r1, r2, r3, r10, r15);
#undef L
#define L(reg, r) { \
SCC_READ_REG(regs, SCC_CHANNEL_B, reg, value); \
r = value; \
}
L(SCC_RR0, r0);
L(SCC_RR1, r1);
L(ZSRR_IVEC, r2);
L(SCC_RR10, r10);
L(SCC_RR15, r15);
printf("B: 0: %x 1: %x 2(state): %x 10: %x 15: %x\n",
r0, r1, r2, r10, r15);
}
#endif /* SCC_DEBUG */
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