/* $NetBSD: ser.c,v 1.59 2023/08/30 19:07:04 andvar Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Leo Weppelman.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*-
* Copyright (c) 1993, 1994, 1995, 1996, 1997
* Charles M. Hannum. All rights reserved.
*
* Interrupt processing and hardware flow control partly based on code from
* Onno van der Linden and Gordon Ross.
*
* 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 Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* 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. 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.
*
* @(#)com.c 7.5 (Berkeley) 5/16/91
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ser.c,v 1.59 2023/08/30 19:07:04 andvar Exp $");
#include "opt_ddb.h"
#include "opt_mbtype.h"
#include "opt_serconsole.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/types.h>
#include <sys/device.h>
#include <sys/kauth.h>
#include <m68k/asm_single.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
#include <machine/intr.h>
#include <atari/dev/serreg.h>
#include "ioconf.h"
#if !defined(_MILANHW_)
#include <atari/dev/ym2149reg.h>
#else
/* MILAN has no ym2149 */
#define ym2149_dtr(set) { \
if (set) \
single_inst_bset_b(MFP->mf_gpip, 0x08); \
else \
single_inst_bclr_b(MFP->mf_gpip, 0x08); \
}
#define ym2149_rts(set) { \
if (set) \
single_inst_bset_b(MFP->mf_gpip, 0x01); \
else \
single_inst_bclr_b(MFP->mf_gpip, 0x01); \
}
#endif /* _MILANHW_ */
/* #define SER_DEBUG */
#define SERUNIT(x) TTUNIT(x)
#define SERDIALOUT(x) TTDIALOUT(x)
/* XXX */
#define CONSBAUD 9600
#define CONSCFLAG TTYDEF_CFLAG
/* end XXX */
/* Buffer size for character buffer */
#define RXBUFSIZE 2048 /* More than enough.. */
#define RXBUFMASK (RXBUFSIZE-1) /* Only iff previous is a power of 2 */
#define RXHIWAT (RXBUFSIZE >> 2)
struct ser_softc {
device_t sc_dev;
struct tty *sc_tty;
struct callout sc_diag_ch;
int sc_overflows;
int sc_floods;
int sc_errors;
uint8_t sc_hwflags;
uint8_t sc_swflags;
int sc_ospeed; /* delay + timer-d data */
uint8_t sc_imra;
uint8_t sc_imrb;
uint8_t sc_ucr; /* Uart control */
uint8_t sc_msr; /* Modem status */
uint8_t sc_tsr; /* Tranceiver status */
uint8_t sc_rsr; /* Receiver status */
uint8_t sc_mcr; /* (Pseudo) Modem ctrl. */
uint8_t sc_msr_delta;
uint8_t sc_msr_mask;
uint8_t sc_mcr_active;
uint8_t sc_mcr_dtr, sc_mcr_rts, sc_msr_cts, sc_msr_dcd;
int sc_r_hiwat;
volatile u_int sc_rbget;
volatile u_int sc_rbput;
volatile u_int sc_rbavail;
uint8_t sc_rbuf[RXBUFSIZE];
uint8_t sc_lbuf[RXBUFSIZE];
volatile uint8_t sc_rx_blocked;
volatile uint8_t sc_rx_ready;
volatile uint8_t sc_tx_busy;
volatile uint8_t sc_tx_done;
volatile uint8_t sc_tx_stopped;
volatile uint8_t sc_st_check;
uint8_t *sc_tba;
int sc_tbc;
int sc_heldtbc;
volatile uint8_t sc_heldchange;
void *sc_sicookie;
};
/*
* For sc_hwflags:
*/
#define SER_HW_CONSOLE 0x01
static void ser_break(struct ser_softc *, int);
static void ser_hwiflow(struct ser_softc *, int);
static void ser_iflush(struct ser_softc *);
static void ser_loadchannelregs(struct ser_softc *);
static void ser_modem(struct ser_softc *, int);
static void serdiag(void *);
static int serhwiflow(struct tty *, int);
static void serinit(int);
static void serinitcons(int);
static int sermintr(void *);
static int sertrintr(void *);
static int serparam(struct tty *, struct termios *);
static void serstart(struct tty *);
struct consdev;
void sercnprobe(struct consdev *);
void sercninit(struct consdev *);
int sercngetc(dev_t);
void sercnputc(dev_t, int);
void sercnpollc(dev_t, int);
static void sermsrint(struct ser_softc *, struct tty*);
static void serrxint(struct ser_softc *, struct tty*);
static void ser_shutdown(struct ser_softc *);
static int serspeed(long);
static void sersoft(void *);
static void sertxint(struct ser_softc *, struct tty*);
/*
* Autoconfig stuff
*/
static int sermatch(device_t, cfdata_t, void *);
static void serattach(device_t, device_t, void *);
CFATTACH_DECL_NEW(ser, sizeof(struct ser_softc),
sermatch, serattach, NULL, NULL);
static dev_type_open(seropen);
static dev_type_close(serclose);
static dev_type_read(serread);
static dev_type_write(serwrite);
static dev_type_ioctl(serioctl);
static dev_type_stop(serstop);
static dev_type_tty(sertty);
static dev_type_poll(serpoll);
const struct cdevsw ser_cdevsw = {
.d_open = seropen,
.d_close = serclose,
.d_read = serread,
.d_write = serwrite,
.d_ioctl = serioctl,
.d_stop = serstop,
.d_tty = sertty,
.d_poll = serpoll,
.d_mmap = nommap,
.d_kqfilter = ttykqfilter,
.d_discard = nodiscard,
.d_flag = D_TTY
};
#ifndef SERCONSOLE
#define SERCONSOLE 0
#endif
int serconsole = SERCONSOLE; /* patchable */
/*ARGSUSED*/
static int
sermatch(device_t parent, cfdata_t cf, void *aux)
{
static int ser_matched = 0;
/* Match at most one ser unit */
if (strcmp((char *)aux, "ser") || ser_matched)
return 0;
ser_matched = 1;
return 1;
}
/*ARGSUSED*/
static void
serattach(device_t parent, device_t self, void *aux)
{
struct ser_softc *sc = device_private(self);
sc->sc_dev = self;
if (intr_establish(1, USER_VEC, 0, (hw_ifun_t)sermintr, sc) == NULL)
aprint_error(": Can't establish interrupt (1)\n");
if (intr_establish(2, USER_VEC, 0, (hw_ifun_t)sermintr, sc) == NULL)
aprint_error(": Can't establish interrupt (2)\n");
if (intr_establish(14, USER_VEC, 0, (hw_ifun_t)sermintr, sc) == NULL)
aprint_error(": Can't establish interrupt (14)\n");
if (intr_establish(9, USER_VEC, 0, (hw_ifun_t)sertrintr, sc) == NULL)
aprint_error(": Can't establish interrupt (9)\n");
if (intr_establish(10, USER_VEC, 0, (hw_ifun_t)sertrintr, sc) == NULL)
aprint_error(": Can't establish interrupt (10)\n");
if (intr_establish(11, USER_VEC, 0, (hw_ifun_t)sertrintr, sc) == NULL)
aprint_error(": Can't establish interrupt (11)\n");
if (intr_establish(12, USER_VEC, 0, (hw_ifun_t)sertrintr, sc) == NULL)
aprint_error(": Can't establish interrupt (12)\n");
sc->sc_sicookie = softint_establish(SOFTINT_SERIAL, sersoft, sc);
ym2149_rts(1);
ym2149_dtr(1);
/*
* Enable but mask interrupts...
* XXX: Look at edge-sensitivity for DCD/CTS interrupts.
*/
MFP->mf_ierb |= IB_SCTS|IB_SDCD;
MFP->mf_iera |= IA_RRDY|IA_RERR|IA_TRDY|IA_TERR;
MFP->mf_imrb &= ~(IB_SCTS|IB_SDCD);
MFP->mf_imra &= ~(IA_RRDY|IA_RERR|IA_TRDY|IA_TERR);
callout_init(&sc->sc_diag_ch, 0);
if (serconsole) {
/*
* Activate serial console when DCD present...
*/
if ((MFP->mf_gpip & MCR_DCD) == 0)
SET(sc->sc_hwflags, SER_HW_CONSOLE);
}
aprint_normal(": modem1 on 68901 MFP1 USART\n");
if (ISSET(sc->sc_hwflags, SER_HW_CONSOLE)) {
serinit(CONSBAUD);
aprint_normal_dev(self, "console\n");
}
}
#ifdef SER_DEBUG
void serstatus(struct ser_softc *, const char *);
void
serstatus(struct ser_softc *sc, const char *str)
{
struct tty *tp = sc->sc_tty;
printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n",
device_xname(sc->sc_dev), str,
ISSET(tp->t_cflag, CLOCAL) ? "+" : "-",
ISSET(sc->sc_msr, MCR_DCD) ? "+" : "-",
ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-",
ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-",
sc->sc_tx_stopped ? "+" : "-");
printf("%s: %s %scrtscts %scts %sts_ttstop %srts %srx_blocked\n",
device_xname(sc->sc_dev), str,
ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-",
ISSET(sc->sc_msr, MCR_CTS) ? "+" : "-",
ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-",
ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-",
sc->sc_rx_blocked ? "+" : "-");
}
#endif /* SER_DEBUG */
static int
seropen(dev_t dev, int flag, int mode, struct lwp *l)
{
int unit = SERUNIT(dev);
struct ser_softc *sc;
struct tty *tp;
int s, s2;
int error = 0;
sc = device_lookup_private(&ser_cd, unit);
if (sc == NULL)
return ENXIO;
if (!sc->sc_tty) {
tp = sc->sc_tty = tty_alloc();
tty_attach(tp);
} else
tp = sc->sc_tty;
if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
return EBUSY;
s = spltty();
/*
* Do the following if this is a first open.
*/
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
struct termios t;
/* Turn on interrupts. */
sc->sc_imra = IA_RRDY|IA_RERR|IA_TRDY|IA_TERR;
sc->sc_imrb = IB_SCTS|IB_SDCD;
single_inst_bset_b(MFP->mf_imra, sc->sc_imra);
single_inst_bset_b(MFP->mf_imrb, sc->sc_imrb);
/* Fetch the current modem control status, needed later. */
sc->sc_msr = ~MFP->mf_gpip & (IO_SDCD|IO_SCTS|IO_SRI);
/* Add some entry points needed by the tty layer. */
tp->t_oproc = serstart;
tp->t_param = serparam;
tp->t_hwiflow = serhwiflow;
tp->t_dev = dev;
/*
* Initialize the termios status to the defaults. Add in the
* sticky bits from TIOCSFLAGS.
*/
t.c_ispeed = 0;
if (ISSET(sc->sc_hwflags, SER_HW_CONSOLE)) {
t.c_ospeed = CONSBAUD;
t.c_cflag = CONSCFLAG;
} else {
t.c_ospeed = TTYDEF_SPEED;
t.c_cflag = TTYDEF_CFLAG;
}
if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL))
SET(t.c_cflag, CLOCAL);
if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS))
SET(t.c_cflag, CRTSCTS);
if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF))
SET(t.c_cflag, MDMBUF);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
(void)serparam(tp, &t);
ttsetwater(tp);
s2 = splhigh();
/*
* Turn on DTR. We must always do this, even if carrier is not
* present, because otherwise we'd have to use TIOCSDTR
* immediately after setting CLOCAL. We will drop DTR only on
* the next high-low transition of DCD, or by explicit request.
*/
ser_modem(sc, 1);
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = 0;
sc->sc_rbavail = RXBUFSIZE;
ser_iflush(sc);
sc->sc_rx_blocked = 0;
ser_hwiflow(sc, 0);
#ifdef SER_DEBUG
serstatus(sc, "seropen ");
#endif
splx(s2);
}
splx(s);
error = ttyopen(tp, SERDIALOUT(dev), ISSET(flag, O_NONBLOCK));
if (error)
goto bad;
error = (*tp->t_linesw->l_open)(dev, tp);
if (error)
goto bad;
return 0;
bad:
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
/*
* We failed to open the device, and nobody else had it opened.
* Clean up the state as appropriate.
*/
ser_shutdown(sc);
}
return error;
}
static int
serclose(dev_t dev, int flag, int mode, struct lwp *l)
{
int unit = SERUNIT(dev);
struct ser_softc *sc = device_lookup_private(&ser_cd, unit);
struct tty *tp = sc->sc_tty;
/* XXX This is for cons.c. */
if (!ISSET(tp->t_state, TS_ISOPEN))
return 0;
(*tp->t_linesw->l_close)(tp, flag);
ttyclose(tp);
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
/*
* Although we got a last close, the device may still be in
* use; e.g. if this was the dialout node, and there are still
* processes waiting for carrier on the non-dialout node.
*/
ser_shutdown(sc);
}
return 0;
}
static int
serread(dev_t dev, struct uio *uio, int flag)
{
struct ser_softc *sc = device_lookup_private(&ser_cd, SERUNIT(dev));
struct tty *tp = sc->sc_tty;
return (*tp->t_linesw->l_read)(tp, uio, flag);
}
static int
serwrite(dev_t dev, struct uio *uio, int flag)
{
struct ser_softc *sc = device_lookup_private(&ser_cd, SERUNIT(dev));
struct tty *tp = sc->sc_tty;
return (*tp->t_linesw->l_write)(tp, uio, flag);
}
static int
serpoll(dev_t dev, int events, struct lwp *l)
{
struct ser_softc *sc = device_lookup_private(&ser_cd, SERUNIT(dev));
struct tty *tp = sc->sc_tty;
return (*tp->t_linesw->l_poll)(tp, events, l);
}
static struct tty *
sertty(dev_t dev)
{
struct ser_softc *sc = device_lookup_private(&ser_cd, SERUNIT(dev));
struct tty *tp = sc->sc_tty;
return tp;
}
static int
serioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
int unit = SERUNIT(dev);
struct ser_softc *sc = device_lookup_private(&ser_cd, unit);
struct tty *tp = sc->sc_tty;
int error;
error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return error;
error = ttioctl(tp, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return error;
switch (cmd) {
case TIOCSBRK:
ser_break(sc, 1);
break;
case TIOCCBRK:
ser_break(sc, 0);
break;
case TIOCSDTR:
ser_modem(sc, 1);
break;
case TIOCCDTR:
ser_modem(sc, 0);
break;
case TIOCGFLAGS:
*(int *)data = sc->sc_swflags;
break;
case TIOCSFLAGS:
error = kauth_authorize_device_tty(l->l_cred,
KAUTH_DEVICE_TTY_PRIVSET, tp);
if (error)
return error;
sc->sc_swflags = *(int *)data;
break;
case TIOCMSET:
case TIOCMBIS:
case TIOCMBIC:
case TIOCMGET:
default:
return EPASSTHROUGH;
}
#ifdef SER_DEBUG
serstatus(sc, "serioctl ");
#endif
return 0;
}
void
ser_break(struct ser_softc *sc, int onoff)
{
int s;
s = splhigh();
if (onoff)
SET(sc->sc_tsr, TSR_SBREAK);
else
CLR(sc->sc_tsr, TSR_SBREAK);
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
ser_loadchannelregs(sc);
}
splx(s);
}
void
ser_modem(struct ser_softc *sc, int onoff)
{
int s;
s = splhigh();
if (onoff)
SET(sc->sc_mcr, sc->sc_mcr_dtr);
else
CLR(sc->sc_mcr, sc->sc_mcr_dtr);
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
ser_loadchannelregs(sc);
}
splx(s);
}
int
serparam(struct tty *tp, struct termios *t)
{
struct ser_softc *sc =
device_lookup_private(&ser_cd, SERUNIT(tp->t_dev));
int ospeed = serspeed(t->c_ospeed);
uint8_t ucr;
int s;
/* check requested parameters */
if (ospeed < 0)
return EINVAL;
if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
return EINVAL;
sc->sc_rsr = RSR_ENAB;
sc->sc_tsr = TSR_ENAB;
ucr = UCR_CLKDIV;
switch (ISSET(t->c_cflag, CSIZE)) {
case CS5:
SET(ucr, UCR_5BITS);
break;
case CS6:
SET(ucr, UCR_6BITS);
break;
case CS7:
SET(ucr, UCR_7BITS);
break;
case CS8:
SET(ucr, UCR_8BITS);
break;
}
if (ISSET(t->c_cflag, PARENB)) {
SET(ucr, UCR_PENAB);
if (!ISSET(t->c_cflag, PARODD))
SET(ucr, UCR_PEVEN);
}
if (ISSET(t->c_cflag, CSTOPB))
SET(ucr, UCR_STOPB2);
else
SET(ucr, UCR_STOPB1);
s = splhigh();
sc->sc_ucr = ucr;
/*
* For the console, always force CLOCAL and !HUPCL, so that the port
* is always active.
*/
if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
ISSET(sc->sc_hwflags, SER_HW_CONSOLE)) {
SET(t->c_cflag, CLOCAL);
CLR(t->c_cflag, HUPCL);
}
/*
* If we're not in a mode that assumes a connection is present, then
* ignore carrier changes.
*/
if (ISSET(t->c_cflag, CLOCAL | MDMBUF))
sc->sc_msr_dcd = 0;
else
sc->sc_msr_dcd = MCR_DCD;
/*
* Set the flow control pins depending on the current flow control
* mode.
*/
if (ISSET(t->c_cflag, CRTSCTS)) {
sc->sc_mcr_dtr = MCR_DTR;
sc->sc_mcr_rts = MCR_RTS;
sc->sc_msr_cts = MCR_CTS;
sc->sc_r_hiwat = RXHIWAT;
} else if (ISSET(t->c_cflag, MDMBUF)) {
/*
* For DTR/DCD flow control, make sure we don't toggle DTR for
* carrier detection.
*/
sc->sc_mcr_dtr = 0;
sc->sc_mcr_rts = MCR_DTR;
sc->sc_msr_cts = MCR_DCD;
sc->sc_r_hiwat = RXHIWAT;
} else {
/*
* If no flow control, then always set RTS. This will make
* the other side happy if it mistakenly thinks we're doing
* RTS/CTS flow control.
*/
sc->sc_mcr_dtr = MCR_DTR | MCR_RTS;
sc->sc_mcr_rts = 0;
sc->sc_msr_cts = 0;
sc->sc_r_hiwat = 0;
if (ISSET(sc->sc_mcr, MCR_DTR))
SET(sc->sc_mcr, MCR_RTS);
else
CLR(sc->sc_mcr, MCR_RTS);
}
sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
#if 0
if (ospeed == 0)
CLR(sc->sc_mcr, sc->sc_mcr_dtr);
else
SET(sc->sc_mcr, sc->sc_mcr_dtr);
#endif
sc->sc_ospeed = ospeed;
/* and copy to tty */
tp->t_ispeed = 0;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
ser_loadchannelregs(sc);
}
splx(s);
/*
* Update the tty layer's idea of the carrier bit, in case we changed
* CLOCAL or MDMBUF. We don't hang up here; we only do that if we
* lose carrier while carrier detection is on.
*/
(void)(*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MCR_DCD));
#ifdef SER_DEBUG
serstatus(sc, "serparam ");
#endif
/* XXXXX FIX ME */
/* Block or unblock as needed. */
if (!ISSET(t->c_cflag, CHWFLOW)) {
if (sc->sc_rx_blocked) {
sc->sc_rx_blocked = 0;
ser_hwiflow(sc, 0);
}
if (sc->sc_tx_stopped) {
sc->sc_tx_stopped = 0;
serstart(tp);
}
} else {
#if 0
sermsrint(sc, tp);
#endif
}
return 0;
}
void
ser_iflush(struct ser_softc *sc)
{
uint8_t tmp;
/* flush any pending I/O */
while (ISSET(MFP->mf_rsr, RSR_CIP|RSR_BFULL))
tmp = MFP->mf_udr;
__USE(tmp);
}
void
ser_loadchannelregs(struct ser_softc *sc)
{
/* XXXXX necessary? */
ser_iflush(sc);
/*
* No interrupts please...
*/
if ((MFP->mf_imra & (IA_RRDY|IA_RERR|IA_TRDY|IA_TERR)) != sc->sc_imra) {
printf("loadchannelregs: mf_imra: %x sc_imra: %x\n",
(u_int)MFP->mf_imra, (u_int)sc->sc_imra);
}
if ((MFP->mf_imrb & (IB_SCTS|IB_SDCD)) != sc->sc_imrb) {
printf("loadchannelregs: mf_imrb: %x sc_imrb: %x\n",
(u_int)MFP->mf_imrb, (u_int)sc->sc_imrb);
}
single_inst_bclr_b(MFP->mf_imra, IA_RRDY|IA_RERR|IA_TRDY|IA_TERR);
single_inst_bclr_b(MFP->mf_imrb, IB_SCTS|IB_SDCD);
MFP->mf_ucr = sc->sc_ucr;
MFP->mf_rsr = sc->sc_rsr;
MFP->mf_tsr = sc->sc_tsr;
single_inst_bclr_b(MFP->mf_tcdcr, 0x07);
MFP->mf_tddr = sc->sc_ospeed;
single_inst_bset_b(MFP->mf_tcdcr, (sc->sc_ospeed >> 8) & 0x0f);
sc->sc_mcr_active = sc->sc_mcr;
if (machineid & ATARI_HADES) {
/* PCB fault, wires exchanged..... */
ym2149_rts(!(sc->sc_mcr_active & MCR_DTR));
ym2149_dtr(!(sc->sc_mcr_active & MCR_RTS));
} else {
ym2149_rts(!(sc->sc_mcr_active & MCR_RTS));
ym2149_dtr(!(sc->sc_mcr_active & MCR_DTR));
}
single_inst_bset_b(MFP->mf_imra, sc->sc_imra);
single_inst_bset_b(MFP->mf_imrb, sc->sc_imrb);
}
int
serhwiflow(struct tty *tp, int block)
{
struct ser_softc *sc =
device_lookup_private(&ser_cd, SERUNIT(tp->t_dev));
int s;
if (sc->sc_mcr_rts == 0)
return 0;
s = splhigh();
if (block) {
/*
* The tty layer is asking us to block input.
* If we already did it, just return TRUE.
*/
if (sc->sc_rx_blocked)
goto out;
sc->sc_rx_blocked = 1;
} else {
/*
* The tty layer is asking us to resume input.
* The input ring is always empty by now.
*/
sc->sc_rx_blocked = 0;
}
ser_hwiflow(sc, block);
out:
splx(s);
return 1;
}
/*
* (un)block input via hw flowcontrol
*/
void
ser_hwiflow(struct ser_softc *sc, int block)
{
if (sc->sc_mcr_rts == 0)
return;
if (block) {
CLR(sc->sc_mcr, sc->sc_mcr_rts);
CLR(sc->sc_mcr_active, sc->sc_mcr_rts);
} else {
SET(sc->sc_mcr, sc->sc_mcr_rts);
SET(sc->sc_mcr_active, sc->sc_mcr_rts);
}
if (machineid & ATARI_HADES) {
/* PCB fault, wires exchanged..... */
ym2149_dtr(sc->sc_mcr_active & MCR_RTS);
}
else {
ym2149_rts(sc->sc_mcr_active & MCR_RTS);
}
}
void
serstart(struct tty *tp)
{
struct ser_softc *sc =
device_lookup_private(&ser_cd, SERUNIT(tp->t_dev));
int s;
s = spltty();
if (ISSET(tp->t_state, TS_BUSY))
goto out;
if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP))
goto stopped;
if (sc->sc_tx_stopped)
goto stopped;
if (!ttypull(tp))
goto stopped;
/* Grab the first contiguous region of buffer space. */
{
uint8_t *tba;
int tbc;
tba = tp->t_outq.c_cf;
tbc = ndqb(&tp->t_outq, 0);
(void)splhigh();
sc->sc_tba = tba;
sc->sc_tbc = tbc;
}
SET(tp->t_state, TS_BUSY);
sc->sc_tx_busy = 1;
/* Enable transmit completion interrupts if necessary. */
if (!ISSET(sc->sc_imra, IA_TRDY)) {
SET(sc->sc_imra, IA_TRDY|IA_TERR);
single_inst_bset_b(MFP->mf_imra, IA_TRDY|IA_TERR);
}
/* Output the first char */
MFP->mf_udr = *sc->sc_tba;
sc->sc_tbc--;
sc->sc_tba++;
splx(s);
return;
stopped:
/* Disable transmit completion interrupts if necessary. */
if (ISSET(sc->sc_imra, IA_TRDY)) {
CLR(sc->sc_imra, IA_TRDY|IA_TERR);
single_inst_bclr_b(MFP->mf_imra, IA_TRDY|IA_TERR);
}
out:
splx(s);
return;
}
/*
* Stop output on a line.
*/
static void
serstop(struct tty *tp, int flag)
{
struct ser_softc *sc =
device_lookup_private(&ser_cd, SERUNIT(tp->t_dev));
int s;
s = splhigh();
if (ISSET(tp->t_state, TS_BUSY)) {
/* Stop transmitting at the next chunk. */
sc->sc_tbc = 0;
sc->sc_heldtbc = 0;
if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
}
splx(s);
}
void
serdiag(void *arg)
{
struct ser_softc *sc = arg;
int overflows, floods;
int s;
s = splhigh();
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
floods = sc->sc_floods;
sc->sc_floods = 0;
sc->sc_errors = 0;
splx(s);
log(LOG_WARNING,
"%s: %d silo overflow%s, %d ibuf flood%s\n",
device_xname(sc->sc_dev),
overflows, overflows == 1 ? "" : "s",
floods, floods == 1 ? "" : "s");
}
static void
ser_shutdown(struct ser_softc *sc)
{
int s;
struct tty *tp = sc->sc_tty;
s = splhigh();
/* If we were asserting flow control, then deassert it. */
sc->sc_rx_blocked = 1;
ser_hwiflow(sc, 1);
/* Clear any break condition set with TIOCSBRK. */
ser_break(sc, 0);
/*
* Hang up if necessary. Wait a bit, so the other side has time to
* notice even if we immediately open the port again.
*/
if (ISSET(tp->t_cflag, HUPCL)) {
ser_modem(sc, 0);
(void)tsleep(sc, TTIPRI, ttclos, hz);
}
/* Turn off interrupts. */
CLR(sc->sc_imra, IA_RRDY|IA_RERR|IA_TRDY|IA_TERR);
CLR(sc->sc_imrb, IB_SCTS|IB_SDCD);
single_inst_bclr_b(MFP->mf_imrb, IB_SCTS|IB_SDCD);
single_inst_bclr_b(MFP->mf_imra, IA_RRDY|IA_RERR|IA_TRDY|IA_TERR);
splx(s);
}
static void
serrxint(struct ser_softc *sc, struct tty *tp)
{
u_int get, cc, scc;
int code;
uint8_t rsr;
int s;
static const int lsrmap[8] = {
0, TTY_PE,
TTY_FE, TTY_PE|TTY_FE,
TTY_FE, TTY_PE|TTY_FE,
TTY_FE, TTY_PE|TTY_FE
};
get = sc->sc_rbget;
scc = cc = RXBUFSIZE - sc->sc_rbavail;
if (cc == RXBUFSIZE) {
sc->sc_floods++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_ch, 60 * hz, serdiag, sc);
}
while (cc--) {
rsr = sc->sc_lbuf[get];
if (ISSET(rsr, RSR_BREAK)) {
#ifdef DDB
if (ISSET(sc->sc_hwflags, SER_HW_CONSOLE))
Debugger();
#endif
} else if (ISSET(rsr, RSR_OERR)) {
sc->sc_overflows++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_ch, 60 * hz,
serdiag, sc);
}
code = sc->sc_rbuf[get] |
lsrmap[(rsr & (RSR_BREAK|RSR_FERR|RSR_PERR)) >> 3];
(*tp->t_linesw->l_rint)(code, tp);
get = (get + 1) & RXBUFMASK;
}
sc->sc_rbget = get;
s = splhigh();
sc->sc_rbavail += scc;
/*
* Buffers should be ok again, release possible block, but only if the
* tty layer isn't blocking too.
*/
if (sc->sc_rx_blocked && !ISSET(tp->t_state, TS_TBLOCK)) {
sc->sc_rx_blocked = 0;
ser_hwiflow(sc, 0);
}
splx(s);
}
static void
sertxint(struct ser_softc *sc, struct tty *tp)
{
CLR(tp->t_state, TS_BUSY);
if (ISSET(tp->t_state, TS_FLUSH))
CLR(tp->t_state, TS_FLUSH);
else
ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf));
(*tp->t_linesw->l_start)(tp);
}
static void
sermsrint(struct ser_softc *sc, struct tty *tp)
{
uint8_t msr, delta;
int s;
s = splhigh();
msr = sc->sc_msr;
delta = sc->sc_msr_delta;
sc->sc_msr_delta = 0;
splx(s);
if (ISSET(delta, sc->sc_msr_dcd)) {
/*
* Inform the tty layer that carrier detect changed.
*/
(void)(*tp->t_linesw->l_modem)(tp, ISSET(msr, MCR_DCD));
}
if (ISSET(delta, sc->sc_msr_cts)) {
/* Block or unblock output according to flow control. */
if (ISSET(msr, sc->sc_msr_cts)) {
sc->sc_tx_stopped = 0;
(*tp->t_linesw->l_start)(tp);
} else {
sc->sc_tx_stopped = 1;
serstop(tp, 0);
}
}
#ifdef SER_DEBUG
serstatus(sc, "sermsrint");
#endif
}
void
sersoft(void *arg)
{
struct ser_softc *sc = arg;
struct tty *tp;
tp = sc->sc_tty;
if (tp == NULL)
return;
if (!ISSET(tp->t_state, TS_ISOPEN) && (tp->t_wopen == 0))
return;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
serrxint(sc, tp);
}
if (sc->sc_st_check) {
sc->sc_st_check = 0;
sermsrint(sc, tp);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
sertxint(sc, tp);
}
}
int
sermintr(void *arg)
{
struct ser_softc *sc = arg;
uint8_t msr, delta;
msr = ~MFP->mf_gpip;
delta = msr ^ sc->sc_msr;
sc->sc_msr = sc->sc_msr & ~(MCR_CTS|MCR_DCD|MCR_RI);
sc->sc_msr |= msr & (MCR_CTS|MCR_DCD|MCR_RI);
if (ISSET(delta, sc->sc_msr_mask)) {
sc->sc_msr_delta |= delta;
/*
* Stop output immediately if we lose the output
* flow control signal or carrier detect.
*/
if (ISSET(~msr, sc->sc_msr_mask)) {
sc->sc_tbc = 0;
sc->sc_heldtbc = 0;
#ifdef SER_DEBUG
serstatus(sc, "sermintr ");
#endif
}
sc->sc_st_check = 1;
}
softint_schedule(sc->sc_sicookie);
return 1;
}
int
sertrintr(void *arg)
{
struct ser_softc *sc = arg;
u_int put, cc;
uint8_t rsr, tsr;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
rsr = MFP->mf_rsr;
if (ISSET(rsr, RSR_BFULL|RSR_BREAK)) {
for (; ISSET(rsr, RSR_BFULL|RSR_BREAK) && cc > 0; cc--) {
sc->sc_rbuf[put] = MFP->mf_udr;
sc->sc_lbuf[put] = rsr;
put = (put + 1) & RXBUFMASK;
if ((rsr & RSR_BREAK) && (MFP->mf_rsr & RSR_BREAK))
rsr = 0;
else
rsr = MFP->mf_rsr;
}
/*
* Current string of incoming characters ended because
* no more data was available. Schedule a receive event
* if any data was received. Drop any characters that
* we couldn't handle.
*/
sc->sc_rbput = put;
sc->sc_rbavail = cc;
sc->sc_rx_ready = 1;
/*
* See if we are in danger of overflowing a buffer. If
* so, use hardware flow control to ease the pressure.
*/
if (sc->sc_rx_blocked == 0 &&
cc < sc->sc_r_hiwat) {
sc->sc_rx_blocked = 1;
ser_hwiflow(sc, 1);
}
/*
* If we're out of space, throw away any further input.
*/
if (!cc) {
while (ISSET(rsr, RSR_BFULL|RSR_BREAK)) {
rsr = MFP->mf_udr;
rsr = MFP->mf_rsr;
}
}
}
/*
* Done handling any receive interrupts. See if data can be
* transmitted as well. Schedule tx done event if no data left
* and tty was marked busy.
*/
tsr = MFP->mf_tsr;
if (ISSET(tsr, TSR_BE)) {
/*
* If we've delayed a parameter change, do it now, and restart
* output.
*/
if (sc->sc_heldchange) {
ser_loadchannelregs(sc);
sc->sc_heldchange = 0;
sc->sc_tbc = sc->sc_heldtbc;
sc->sc_heldtbc = 0;
}
/* Output the next character, if any. */
if (sc->sc_tbc > 0) {
MFP->mf_udr = *sc->sc_tba;
sc->sc_tbc--;
sc->sc_tba++;
} else if (sc->sc_tx_busy) {
sc->sc_tx_busy = 0;
sc->sc_tx_done = 1;
}
}
softint_schedule(sc->sc_sicookie);
return 1;
}
static int
serspeed(long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int div, x, err;
if (speed <= 0)
return -1;
for (div = 4; div <= 64; div *= 4) {
x = divrnd((SER_FREQ / div), speed);
/*
* The value must fit in the timer-d dataregister. If
* not, try another delay-mode.
*/
if ((x / 2) > 255)
continue;
/*
* Baudrate to high for the interface or cannot be made
* within tolerance.
*/
if (x <= 0)
return -1;
err = divrnd((SER_FREQ / div) * 1000, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > SER_TOLERANCE)
continue;
/*
* Translate 'div' to delay-code
*/
if (div == 4)
div = 1;
else if (div == 16)
div = 3;
else if (div == 64)
div = 5;
return (x / 2) | (div << 8);
}
return -1;
#undef divrnd
}
/*
* Following are all routines needed for SER to act as console
*/
#include <dev/cons.h>
void
sercnprobe(struct consdev *cp)
{
/*
* Activate serial console when DCD present...
*/
if (MFP->mf_gpip & MCR_DCD) {
cp->cn_pri = CN_DEAD;
return;
}
/* initialize required fields */
/* XXX: LWP What unit? */
cp->cn_dev = makedev(cdevsw_lookup_major(&ser_cdevsw), 0);
if (serconsole)
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
else
cp->cn_pri = CN_NORMAL;
}
void
sercninit(struct consdev *cp)
{
serinitcons(CONSBAUD);
}
/*
* Initialize UART to known state.
*/
void
serinit(int baud)
{
int ospeed = serspeed(baud);
MFP->mf_ucr = UCR_CLKDIV|UCR_8BITS|UCR_STOPB1;
MFP->mf_rsr = RSR_ENAB;
MFP->mf_tsr = TSR_ENAB;
single_inst_bclr_b(MFP->mf_tcdcr, 0x07);
MFP->mf_tddr = ospeed;
single_inst_bset_b(MFP->mf_tcdcr, (ospeed >> 8) & 0x0f);
}
/*
* Set UART for console use. Do normal init, then enable interrupts.
*/
void
serinitcons(int baud)
{
serinit(baud);
/* Set rts/dtr */
ym2149_rts(0);
ym2149_dtr(0);
single_inst_bset_b(MFP->mf_imra, (IA_RRDY|IA_RERR|IA_TRDY|IA_TERR));
}
int
sercngetc(dev_t dev)
{
uint8_t stat, c;
int s;
s = splhigh();
while (!ISSET(stat = MFP->mf_rsr, RSR_BFULL)) {
if (!ISSET(stat, RSR_ENAB)) /* XXX */
MFP->mf_rsr |= RSR_ENAB;
if (stat & (RSR_FERR|RSR_PERR|RSR_OERR))
c = MFP->mf_udr;
}
c = MFP->mf_udr;
splx(s);
return c;
}
#if 1
u_int s_imra;
u_int s_stat1, s_stat2, s_stat3;
#endif
void
sercnputc(dev_t dev, int c)
{
int timo;
uint8_t stat, imra;
/* Mask serial interrupts */
imra = MFP->mf_imra & (IA_RRDY|IA_RERR|IA_TRDY|IA_TERR);
single_inst_bclr_b(MFP->mf_imra, imra);
#if 1
s_imra = imra;
#endif
/* wait for any pending transmission to finish */
timo = 50000;
#if 1
s_stat1 = MFP->mf_tsr;
#endif
while (!ISSET(stat = MFP->mf_tsr, TSR_BE) && --timo)
;
MFP->mf_udr = c;
/* wait for this transmission to complete */
timo = 1500000;
#if 1
s_stat2 = MFP->mf_tsr;
#endif
while (!ISSET(stat = MFP->mf_tsr, TSR_BE) && --timo)
;
#if 1
s_stat3 = MFP->mf_tsr;
#endif
/* Clear pending serial interrupts and re-enable */
MFP->mf_ipra = (uint8_t)~imra;
single_inst_bset_b(MFP->mf_imra, imra);
}
void
sercnpollc(dev_t dev, int on)
{
}
