NetBSD-5.0.2/sys/arch/x68k/dev/com.c
/* $NetBSD: com.c,v 1.53 2008/06/13 13:57:58 cegger Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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) 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
*/
/*
* COM driver, based on HP dca driver
* uses National Semiconductor NS16450/NS16550AF UART
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.53 2008/06/13 13:57:58 cegger Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_com.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/user.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 <machine/cpu.h>
#if 0
#include <machine/pio.h>
#endif
#include <x68k/x68k/iodevice.h>
#if 0
#include <dev/isa/isavar.h>
#endif
#include <x68k/dev/comreg.h>
#include <dev/ic/ns16550reg.h>
#ifdef COM_HAYESP
#include <dev/ic/hayespreg.h>
#endif
#define com_lcr com_cfcr
#define COM_IBUFSIZE (2 * 512)
#define COM_IHIGHWATER ((3 * COM_IBUFSIZE) / 4)
struct com_softc {
struct device sc_dev;
void *sc_ih;
struct tty *sc_tty;
struct callout sc_diag_ch;
int sc_overflows;
int sc_floods;
int sc_errors;
int sc_halt;
int sc_iobase;
#ifdef COM_HAYESP
int sc_hayespbase;
#endif
u_char sc_hwflags;
#define COM_HW_NOIEN 0x01
#define COM_HW_FIFO 0x02
#define COM_HW_HAYESP 0x04
#define COM_HW_CONSOLE 0x40
u_char sc_swflags;
#define COM_SW_SOFTCAR 0x01
#define COM_SW_CLOCAL 0x02
#define COM_SW_CRTSCTS 0x04
#define COM_SW_MDMBUF 0x08
u_char sc_msr, sc_mcr, sc_lcr, sc_ier;
u_char sc_dtr;
u_char *sc_ibuf, *sc_ibufp, *sc_ibufhigh, *sc_ibufend;
u_char sc_ibufs[2][COM_IBUFSIZE];
};
struct callout com_poll_ch;
int comprobe(struct device *, struct cfdata *, void *);
void comattach(struct device *, struct device *, void *);
static int comprobe1(int);
static void comdiag(void *);
int comintr(void *);
static void compollin(void *);
static int comparam(struct tty *, struct termios *);
static void comstart(struct tty *);
static void cominit(int);
static int comspeed(long);
static u_char tiocm_xxx2mcr(int);
CFATTACH_DECL(xcom, sizeof(struct com_softc),
comprobe, comattach, NULL, NULL);
extern struct cfdriver xcom_cd;
int com_attached;
dev_type_open(comopen);
dev_type_close(comclose);
dev_type_read(comread);
dev_type_write(comwrite);
dev_type_ioctl(comioctl);
dev_type_stop(comstop);
dev_type_tty(comtty);
dev_type_poll(compoll);
const struct cdevsw xcom_cdevsw = {
comopen, comclose, comread, comwrite, comioctl,
comstop, comtty, compoll, nommap, ttykqfilter, D_TTY
};
#define outb(addr, val) *(u_char *)(addr) = (val)
#define inb(addr) *(u_char *)(addr)
#define pio(addr,regno) ((addr)+1+(regno)*2)
#ifdef COMCONSOLE
int comdefaultrate = CONSPEED;
int comconsole = COMCONSOLE;
#else
int comdefaultrate = TTYDEF_SPEED;
int comconsole = -1;
#endif
int comconsinit;
int comsopen = 0;
int comevents = 0;
#ifdef KGDB
#include <machine/remote-sl.h>
extern int kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif
#define COMUNIT(x) (minor(x) & 0x7F)
#define COMDIALOUT(x) (minor(x) & 0x80)
static int
comspeed(long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed == 0)
return 0;
if (speed < 0)
return -1;
x = divrnd((COM_FREQ / 16), speed);
if (x <= 0)
return -1;
err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return -1;
return x;
#undef divrnd
}
static int
comprobe1(int iobase)
{
if (badbaddr((void *)pio(iobase, com_lcr)))
return 0;
/* force access to id reg */
outb(pio(iobase , com_lcr), 0);
outb(pio(iobase , com_iir), 0);
if (inb(pio(iobase , com_iir)) & 0x38)
return 0;
return 1;
}
#ifdef COM_HAYESP
int
comprobeHAYESP(int iobase, struct com_softc *sc)
{
char val, dips;
int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
/*
* Hayes ESP cards have two iobases. One is for compatibility with
* 16550 serial chips, and at the same ISA PC base addresses. The
* other is for ESP-specific enhanced features, and lies at a
* different addressing range entirely (0x140, 0x180, 0x280, or 0x300).
*/
/* Test for ESP signature */
if ((inb(iobase) & 0xf3) == 0)
return 0;
/*
* ESP is present at ESP enhanced base address; unknown com port
*/
/* Get the dip-switch configurations */
outb(iobase + HAYESP_CMD1, HAYESP_GETDIPS);
dips = inb(iobase + HAYESP_STATUS1);
/* Determine which com port this ESP card services: bits 0,1 of */
/* dips is the port # (0-3); combaselist[val] is the com_iobase */
if (sc->sc_iobase != combaselist[dips & 0x03])
return 0;
printf(": ESP");
/* Check ESP Self Test bits. */
/* Check for ESP version 2.0: bits 4,5,6 == 010 */
outb(iobase + HAYESP_CMD1, HAYESP_GETTEST);
val = inb(iobase + HAYESP_STATUS1); /* Clear reg 1 */
val = inb(iobase + HAYESP_STATUS2);
if ((val & 0x70) < 0x20) {
printf("-old (%o)", val & 0x70);
/* we do not support the necessary features */
return 0;
}
/* Check for ability to emulate 16550: bit 8 == 1 */
if ((dips & 0x80) == 0) {
printf(" slave");
/* XXX Does slave really mean no 16550 support?? */
return 0;
}
/*
* If we made it this far, we are a full-featured ESP v2.0 (or
* better), at the correct com port address.
*/
SET(sc->sc_hwflags, COM_HW_HAYESP);
printf(", 1024 byte fifo\n");
return 1;
}
#endif
int
comprobe(struct device *parent, struct cfdata *cfp, void *aux)
{
int iobase = (int)&IODEVbase->psx16550;
if (strcmp(aux, "com") || com_attached)
return 0;
if (!comprobe1(iobase))
return 0;
return 1;
}
void
comattach(struct device *parent, struct device *dev, void *aux)
{
struct com_softc *sc = (struct com_softc *)dev;
int iobase = (int)&IODEVbase->psx16550;
#ifdef COM_HAYESP
int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 };
int *hayespp;
#endif
com_attached = 1;
callout_init(&sc->sc_diag_ch, 0);
callout_init(&com_poll_ch, 0);
sc->sc_iobase = iobase;
sc->sc_hwflags = 0;
sc->sc_swflags = 0;
printf(": iobase %x", sc->sc_iobase);
#ifdef COM_HAYESP
/* Look for a Hayes ESP board. */
for (hayespp = hayesp_ports; *hayespp != 0; hayespp++)
if (comprobeHAYESP(*hayespp, sc)) {
sc->sc_hayespbase = *hayespp;
break;
}
/* No ESP; look for other things. */
if (*hayespp == 0) {
#endif
/* look for a NS 16550AF UART with FIFOs */
outb(pio(iobase , com_fifo),
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14);
DELAY(100);
if (ISSET(inb(pio(iobase , com_iir)), IIR_FIFO_MASK) == IIR_FIFO_MASK)
if (ISSET(inb(pio(iobase , com_fifo)), FIFO_TRIGGER_14) == FIFO_TRIGGER_14) {
SET(sc->sc_hwflags, COM_HW_FIFO);
printf(": ns16550a, working fifo\n");
} else
printf(": ns16550, broken fifo\n");
else
printf(": ns8250 or ns16450, no fifo\n");
outb(pio(iobase , com_fifo), 0);
#ifdef COM_HAYESP
}
#endif
/* disable interrupts */
outb(pio(iobase , com_ier), 0);
outb(pio(iobase , com_mcr), 0);
if (sc->sc_iobase == CONADDR) {
/*
* Need to reset baud rate, etc. of next print so reset
* comconsinit. Also make sure console is always "hardwired".
*/
comconsinit = 0;
SET(sc->sc_hwflags, COM_HW_CONSOLE);
SET(sc->sc_swflags, COM_SW_SOFTCAR);
}
}
int
comopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct com_softc *sc;
int iobase;
struct tty *tp;
int s;
int error = 0;
sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
if (!sc)
return ENXIO;
if (!sc->sc_tty) {
tp = sc->sc_tty = ttymalloc();
tty_attach(tp);
} else
tp = sc->sc_tty;
tp->t_oproc = comstart;
tp->t_param = comparam;
tp->t_dev = dev;
if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
return (EBUSY);
s = spltty();
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
ttychars(tp);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
if (ISSET(sc->sc_swflags, COM_SW_CLOCAL))
SET(tp->t_cflag, CLOCAL);
if (ISSET(sc->sc_swflags, COM_SW_CRTSCTS))
SET(tp->t_cflag, CRTSCTS);
if (ISSET(sc->sc_swflags, COM_SW_MDMBUF))
SET(tp->t_cflag, MDMBUF);
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = comdefaultrate;
comparam(tp, &tp->t_termios);
ttsetwater(tp);
if (comsopen++ == 0)
callout_reset(&com_poll_ch, 1, compollin, NULL);
sc->sc_ibufp = sc->sc_ibuf = sc->sc_ibufs[0];
sc->sc_ibufhigh = sc->sc_ibuf + COM_IHIGHWATER;
sc->sc_ibufend = sc->sc_ibuf + COM_IBUFSIZE;
iobase = sc->sc_iobase;
#ifdef COM_HAYESP
/* Setup the ESP board */
if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) {
int hayespbase = sc->sc_hayespbase;
outb(iobase + com_fifo,
FIFO_DMA_MODE|FIFO_ENABLE|
FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_8);
/* Set 16550 compatibility mode */
outb(hayespbase + HAYESP_CMD1, HAYESP_SETMODE);
outb(hayespbase + HAYESP_CMD2,
HAYESP_MODE_FIFO|HAYESP_MODE_RTS|
HAYESP_MODE_SCALE);
/* Set RTS/CTS flow control */
outb(hayespbase + HAYESP_CMD1, HAYESP_SETFLOWTYPE);
outb(hayespbase + HAYESP_CMD2, HAYESP_FLOW_RTS);
outb(hayespbase + HAYESP_CMD2, HAYESP_FLOW_CTS);
/* Set flow control levels */
outb(hayespbase + HAYESP_CMD1, HAYESP_SETRXFLOW);
outb(hayespbase + HAYESP_CMD2,
HAYESP_HIBYTE(HAYESP_RXHIWMARK));
outb(hayespbase + HAYESP_CMD2,
HAYESP_LOBYTE(HAYESP_RXHIWMARK));
outb(hayespbase + HAYESP_CMD2,
HAYESP_HIBYTE(HAYESP_RXLOWMARK));
outb(hayespbase + HAYESP_CMD2,
HAYESP_LOBYTE(HAYESP_RXLOWMARK));
} else
#endif
if (ISSET(sc->sc_hwflags, COM_HW_FIFO))
/* Set the FIFO threshold based on the receive speed. */
outb(pio(iobase , com_fifo),
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
(tp->t_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
/* flush any pending I/O */
while (ISSET(inb(pio(iobase , com_lsr)), LSR_RXRDY))
(void) inb(pio(iobase , com_data));
/* you turn me on, baby */
sc->sc_mcr = MCR_DTR | MCR_RTS;
if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN))
SET(sc->sc_mcr, MCR_IENABLE | MCR_DRS); /* */
outb(pio(iobase , com_mcr), sc->sc_mcr);
sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC;
outb(pio(iobase , com_ier), sc->sc_ier);
sc->sc_msr = inb(pio(iobase , com_msr));
if (ISSET(sc->sc_swflags, COM_SW_SOFTCAR) ||
ISSET(sc->sc_msr, MSR_DCD) || ISSET(tp->t_cflag, MDMBUF))
SET(tp->t_state, TS_CARR_ON);
else
CLR(tp->t_state, TS_CARR_ON);
}
splx(s);
error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK));
if (!error)
error = (*tp->t_linesw->l_open)(dev, tp);
/* XXX cleanup on error */
return error;
}
int
comclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
int iobase = sc->sc_iobase;
int s;
/* XXX This is for cons.c. */
if (!ISSET(tp->t_state, TS_ISOPEN))
return 0;
(*tp->t_linesw->l_close)(tp, flag);
s = spltty();
CLR(sc->sc_lcr, LCR_SBREAK);
outb(pio(iobase , com_lcr), sc->sc_lcr);
outb(pio(iobase , com_ier), 0);
if (ISSET(tp->t_cflag, HUPCL) &&
!ISSET(sc->sc_swflags, COM_SW_SOFTCAR)) {
/* XXX perhaps only clear DTR */
outb(pio(iobase , com_mcr), 0);
}
CLR(tp->t_state, TS_BUSY | TS_FLUSH);
if (--comsopen == 0)
callout_stop(&com_poll_ch);
splx(s);
ttyclose(tp);
#ifdef notyet /* XXXX */
if (unit != comconsole) {
ttyfree(tp);
sc->sc_tty = 0;
}
#endif
return 0;
}
int
comread(dev_t dev, struct uio *uio, int flag)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return ((*tp->t_linesw->l_read)(tp, uio, flag));
}
int
comwrite(dev_t dev, struct uio *uio, int flag)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return ((*tp->t_linesw->l_write)(tp, uio, flag));
}
int
compoll(dev_t dev, int events, struct lwp *l)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return ((*tp->t_linesw->l_poll)(tp, events, l));
}
struct tty *
comtty(dev_t dev)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return (tp);
}
static u_char
tiocm_xxx2mcr(int data)
{
u_char m = 0;
if (ISSET(data, TIOCM_DTR))
SET(m, MCR_DTR);
if (ISSET(data, TIOCM_RTS))
SET(m, MCR_RTS);
return m;
}
int
comioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
int iobase = sc->sc_iobase;
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:
SET(sc->sc_lcr, LCR_SBREAK);
outb(pio(iobase , com_lcr), sc->sc_lcr);
break;
case TIOCCBRK:
CLR(sc->sc_lcr, LCR_SBREAK);
outb(pio(iobase , com_lcr), sc->sc_lcr);
break;
case TIOCSDTR:
SET(sc->sc_mcr, sc->sc_dtr);
outb(pio(iobase , com_mcr), sc->sc_mcr);
break;
case TIOCCDTR:
CLR(sc->sc_mcr, sc->sc_dtr);
outb(pio(iobase , com_mcr), sc->sc_mcr);
break;
case TIOCMSET:
CLR(sc->sc_mcr, MCR_DTR | MCR_RTS);
case TIOCMBIS:
SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data));
outb(pio(iobase , com_mcr), sc->sc_mcr);
break;
case TIOCMBIC:
CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data));
outb(pio(iobase , com_mcr), sc->sc_mcr);
break;
case TIOCMGET: {
u_char m;
int bits = 0;
m = sc->sc_mcr;
if (ISSET(m, MCR_DTR))
SET(bits, TIOCM_DTR);
if (ISSET(m, MCR_RTS))
SET(bits, TIOCM_RTS);
m = sc->sc_msr;
if (ISSET(m, MSR_DCD))
SET(bits, TIOCM_CD);
if (ISSET(m, MSR_CTS))
SET(bits, TIOCM_CTS);
if (ISSET(m, MSR_DSR))
SET(bits, TIOCM_DSR);
if (ISSET(m, MSR_RI | MSR_TERI))
SET(bits, TIOCM_RI);
if (inb(pio(iobase , com_ier)))
SET(bits, TIOCM_LE);
*(int *)data = bits;
break;
}
case TIOCGFLAGS: {
int driverbits, userbits = 0;
driverbits = sc->sc_swflags;
if (ISSET(driverbits, COM_SW_SOFTCAR))
SET(userbits, TIOCFLAG_SOFTCAR);
if (ISSET(driverbits, COM_SW_CLOCAL))
SET(userbits, TIOCFLAG_CLOCAL);
if (ISSET(driverbits, COM_SW_CRTSCTS))
SET(userbits, TIOCFLAG_CRTSCTS);
if (ISSET(driverbits, COM_SW_MDMBUF))
SET(userbits, TIOCFLAG_MDMBUF);
*(int *)data = userbits;
break;
}
case TIOCSFLAGS: {
int userbits, driverbits = 0;
error = kauth_authorize_device_tty(l->l_cred,
KAUTH_DEVICE_TTY_PRIVSET, tp);
if (error != 0)
return(EPERM);
userbits = *(int *)data;
if (ISSET(userbits, TIOCFLAG_SOFTCAR) ||
ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
SET(driverbits, COM_SW_SOFTCAR);
if (ISSET(userbits, TIOCFLAG_CLOCAL))
SET(driverbits, COM_SW_CLOCAL);
if (ISSET(userbits, TIOCFLAG_CRTSCTS))
SET(driverbits, COM_SW_CRTSCTS);
if (ISSET(userbits, TIOCFLAG_MDMBUF))
SET(driverbits, COM_SW_MDMBUF);
sc->sc_swflags = driverbits;
break;
}
default:
return EPASSTHROUGH;
}
return 0;
}
static int
comparam(struct tty *tp, struct termios *t)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(tp->t_dev));
int iobase = sc->sc_iobase;
int ospeed = comspeed(t->c_ospeed);
u_char lcr;
tcflag_t oldcflag;
int s;
/* check requested parameters */
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
return EINVAL;
lcr = ISSET(sc->sc_lcr, LCR_SBREAK);
switch (ISSET(t->c_cflag, CSIZE)) {
case CS5:
SET(lcr, LCR_5BITS);
break;
case CS6:
SET(lcr, LCR_6BITS);
break;
case CS7:
SET(lcr, LCR_7BITS);
break;
case CS8:
SET(lcr, LCR_8BITS);
break;
}
if (ISSET(t->c_cflag, PARENB)) {
SET(lcr, LCR_PENAB);
if (!ISSET(t->c_cflag, PARODD))
SET(lcr, LCR_PEVEN);
}
if (ISSET(t->c_cflag, CSTOPB))
SET(lcr, LCR_STOPB);
sc->sc_lcr = lcr;
s = spltty();
if (ospeed == 0) {
CLR(sc->sc_mcr, MCR_DTR);
outb(pio(iobase , com_mcr), sc->sc_mcr);
}
/*
* Set the FIFO threshold based on the receive speed, if we are
* changing it.
*/
if (tp->t_ispeed != t->c_ispeed) {
if (ISSET(sc->sc_hwflags, COM_HW_FIFO))
outb(pio(iobase , com_fifo),
FIFO_ENABLE |
(t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
}
if (ospeed != 0) {
outb(pio(iobase , com_lcr), lcr | LCR_DLAB);
outb(pio(iobase , com_dlbl), ospeed);
outb(pio(iobase , com_dlbh), ospeed >> 8);
outb(pio(iobase , com_lcr), lcr);
SET(sc->sc_mcr, MCR_DTR);
outb(pio(iobase , com_mcr), sc->sc_mcr);
} else
outb(pio(iobase , com_lcr), lcr);
/* When not using CRTSCTS, RTS follows DTR. */
if (!ISSET(t->c_cflag, CRTSCTS)) {
if (ISSET(sc->sc_mcr, MCR_DTR)) {
if (!ISSET(sc->sc_mcr, MCR_RTS)) {
SET(sc->sc_mcr, MCR_RTS);
outb(pio(iobase , com_mcr), sc->sc_mcr);
}
} else {
if (ISSET(sc->sc_mcr, MCR_RTS)) {
CLR(sc->sc_mcr, MCR_RTS);
outb(pio(iobase , com_mcr), sc->sc_mcr);
}
}
sc->sc_dtr = MCR_DTR | MCR_RTS;
} else
sc->sc_dtr = MCR_DTR;
/* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
oldcflag = tp->t_cflag;
tp->t_cflag = t->c_cflag;
/*
* If DCD is off and MDMBUF is changed, ask the tty layer if we should
* stop the device.
*/
if (!ISSET(sc->sc_msr, MSR_DCD) &&
!ISSET(sc->sc_swflags, COM_SW_SOFTCAR) &&
ISSET(oldcflag, MDMBUF) != ISSET(tp->t_cflag, MDMBUF) &&
(*tp->t_linesw->l_modem)(tp, 0) == 0) {
CLR(sc->sc_mcr, sc->sc_dtr);
outb(pio(iobase , com_mcr), sc->sc_mcr);
}
/* Just to be sure... */
splx(s);
comstart(tp);
return 0;
}
int comdebug = 0;
static void
comstart(struct tty *tp)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, COMUNIT(tp->t_dev));
int iobase = sc->sc_iobase;
int s;
#ifdef DDB
if (comdebug)
Debugger();
#endif
s = spltty();
if (ISSET(tp->t_state, TS_BUSY))
goto out;
if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP) ||
sc->sc_halt > 0)
goto stopped;
if (ISSET(tp->t_cflag, CRTSCTS) && !ISSET(sc->sc_msr, MSR_CTS))
goto stopped;
if (!ttypull(tp))
goto stopped;
SET(tp->t_state, TS_BUSY);
if (!ISSET(sc->sc_ier, IER_ETXRDY)) {
SET(sc->sc_ier, IER_ETXRDY);
outb(pio(iobase, com_ier), sc->sc_ier);
}
#ifdef COM_HAYESP
if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) {
u_char buffer[1024], *cp = buffer;
int n = q_to_b(&tp->t_outq, cp, sizeof buffer);
do
outb(iobase + com_data, *cp++);
while (--n);
}
else
#endif
if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
u_char buffer[16], *cp = buffer;
int n = q_to_b(&tp->t_outq, cp, sizeof buffer);
do {
outb(pio(iobase , com_data), *cp++);
} while (--n);
} else
outb(pio(iobase , com_data), getc(&tp->t_outq));
out:
splx(s);
return;
stopped:
if (ISSET(sc->sc_ier, IER_ETXRDY)) {
CLR(sc->sc_ier, IER_ETXRDY);
outb(pio(iobase, com_ier), sc->sc_ier);
}
splx(s);
}
/*
* Stop output on a line.
*/
void
comstop(struct tty *tp, int flag)
{
int s;
s = spltty();
if (ISSET(tp->t_state, TS_BUSY))
if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
splx(s);
}
static void
comdiag(void *arg)
{
struct com_softc *sc = arg;
int overflows, floods;
int s;
s = spltty();
sc->sc_errors = 0;
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
floods = sc->sc_floods;
sc->sc_floods = 0;
splx(s);
log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf overflow%s\n",
sc->sc_dev.dv_xname,
overflows, overflows == 1 ? "" : "s",
floods, floods == 1 ? "" : "s");
}
static void
compollin(void *arg)
{
int unit;
struct com_softc *sc;
struct tty *tp;
u_char *ibufp;
u_char *ibufend;
int c;
int s;
static int lsrmap[8] = {
0, TTY_PE,
TTY_FE, TTY_PE|TTY_FE,
TTY_FE, TTY_PE|TTY_FE,
TTY_FE, TTY_PE|TTY_FE
};
s = spltty();
if (comevents == 0) {
splx(s);
goto out;
}
comevents = 0;
splx(s);
for (unit = 0; unit < xcom_cd.cd_ndevs; unit++) {
sc = device_lookup_private(&xcom_cd, unit);
if (sc == NULL || sc->sc_ibufp == sc->sc_ibuf)
continue;
tp = sc->sc_tty;
s = spltty();
ibufp = sc->sc_ibuf;
ibufend = sc->sc_ibufp;
if (ibufp == ibufend) {
splx(s);
continue;
}
sc->sc_ibufp = sc->sc_ibuf = (ibufp == sc->sc_ibufs[0]) ?
sc->sc_ibufs[1] : sc->sc_ibufs[0];
sc->sc_ibufhigh = sc->sc_ibuf + COM_IHIGHWATER;
sc->sc_ibufend = sc->sc_ibuf + COM_IBUFSIZE;
if (tp == 0 || !ISSET(tp->t_state, TS_ISOPEN)) {
splx(s);
continue;
}
if (ISSET(tp->t_cflag, CRTSCTS) &&
!ISSET(sc->sc_mcr, MCR_RTS)) {
/* XXX */
SET(sc->sc_mcr, MCR_RTS);
outb(pio(sc->sc_iobase , com_mcr), sc->sc_mcr);
}
splx(s);
while (ibufp < ibufend) {
c = *ibufp++;
if (*ibufp & LSR_OE) {
sc->sc_overflows++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_ch, 60 * hz,
comdiag, sc);
}
/* This is ugly, but fast. */
c |= lsrmap[(*ibufp++ & (LSR_BI|LSR_FE|LSR_PE)) >> 2];
(*tp->t_linesw->l_rint)(c, tp);
}
}
out:
callout_reset(&com_poll_ch, 1, compollin, NULL);
}
int
comintr(void *arg)
{
struct com_softc *sc = device_lookup_private(&xcom_cd, *((int *)arg));
int iobase = sc->sc_iobase;
struct tty *tp;
u_char lsr, data, msr, delta;
int iir;
#if 1
if ((iir = ISSET(inb(pio(iobase , com_iir)), IIR_NOPEND)))
return (0);
#endif
tp = sc->sc_tty;
for (;;) {
lsr = inb(pio(iobase , com_lsr));
if (ISSET(lsr, LSR_RXRDY)) {
u_char *p = sc->sc_ibufp;
comevents = 1;
do {
data = inb(pio(iobase, com_data));
if (ISSET(lsr, LSR_BI)) {
#ifdef DDB
if (iobase == CONADDR) {
Debugger();
goto next;
}
#endif
}
if (p >= sc->sc_ibufend) {
sc->sc_floods++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_ch,
60 * hz, comdiag, sc);
} else {
*p++ = data;
*p++ = lsr;
if (p == sc->sc_ibufhigh &&
ISSET(tp->t_cflag, CRTSCTS)) {
/* XXX */
CLR(sc->sc_mcr, MCR_RTS);
outb(pio(iobase , com_mcr),
sc->sc_mcr);
}
}
#ifdef DDB
next:
#endif
lsr = inb(pio(iobase , com_lsr));
} while (ISSET(lsr, LSR_RXRDY));
sc->sc_ibufp = p;
}
#ifdef COMDEBUG
else if (ISSET(lsr, LSR_BI|LSR_FE|LSR_PE|LSR_OE))
printf("weird lsr %02x\n", lsr);
#endif
msr = inb(pio(iobase , com_msr));
if (msr != sc->sc_msr) {
delta = msr ^ sc->sc_msr;
sc->sc_msr = msr;
if (ISSET(delta, MSR_DCD) &&
!ISSET(sc->sc_swflags, COM_SW_SOFTCAR) &&
(*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)) == 0) {
CLR(sc->sc_mcr, sc->sc_dtr);
outb(pio(iobase , com_mcr), sc->sc_mcr);
}
if (ISSET(delta & msr, MSR_CTS) &&
ISSET(tp->t_cflag, CRTSCTS)) {
/* the line is up and we want to do rts/cts flow control */
(*tp->t_linesw->l_start)(tp);
}
}
if (ISSET(lsr, LSR_TXRDY) && ISSET(tp->t_state, TS_BUSY)) {
CLR(tp->t_state, TS_BUSY | TS_FLUSH);
if (sc->sc_halt > 0)
cv_broadcast(&tp->t_outcv);
(*tp->t_linesw->l_start)(tp);
}
if ((iir = ISSET(inb(pio(iobase , com_iir)), IIR_NOPEND)))
return (1);
}
}
/*
* Following are all routines needed for COM to act as console
*/
#include <dev/cons.h>
void comcnprobe(struct consdev *);
void comcninit(struct consdev *);
int comcngetc(dev_t);
void comcnputc(dev_t, int);
void comcnpollc(dev_t, int);
void
comcnprobe(struct consdev *cp)
{
int maj;
if (!comprobe1(CONADDR)) {
cp->cn_pri = CN_DEAD;
return;
}
/* locate the major number */
maj = cdevsw_lookup_major(&xcom_cdevsw);
/* initialize required fields */
cp->cn_dev = makedev(maj, CONUNIT);
#ifdef COMCONSOLE
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
#else
cp->cn_pri = CN_NORMAL;
#endif
}
void
comcninit(struct consdev *cp)
{
cominit(comdefaultrate);
comconsole = CONUNIT;
comconsinit = 0;
}
static void
cominit(int rate)
{
int s;
int iobase = CONADDR;
u_char stat;
s = splhigh();
outb(pio(iobase , com_lcr), LCR_DLAB);
rate = comspeed(comdefaultrate);
outb(pio(iobase , com_dlbl), rate);
outb(pio(iobase , com_dlbh), rate >> 8);
outb(pio(iobase , com_lcr), LCR_8BITS);
outb(pio(iobase , com_ier), IER_ERXRDY | IER_ETXRDY);
outb(pio(iobase , com_fifo), FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4);
stat = inb(pio(iobase , com_iir));
splx(s);
}
int
comcngetc(dev_t dev)
{
int s;
int iobase = CONADDR;
u_char stat, c;
s = splhigh();
while (!ISSET(stat = inb(pio(iobase , com_lsr)), LSR_RXRDY))
;
c = inb(pio(iobase , com_data));
stat = inb(pio(iobase , com_iir));
splx(s);
return c;
}
/*
* Console kernel output character routine.
*/
void
comcnputc(dev_t dev, int c)
{
int s;
int iobase = CONADDR;
u_char stat;
int timo;
s = splhigh();
#ifdef KGDB
if (dev != kgdb_dev)
#endif
if (comconsinit == 0) {
(void) cominit(comdefaultrate);
comconsinit = 1;
}
/* wait for any pending transmission to finish */
timo = 50000;
while (!ISSET(stat = inb(pio(iobase , com_lsr)), LSR_TXRDY) && --timo)
;
outb(pio(iobase , com_data), c);
/* wait for this transmission to complete */
timo = 1500000;
while (!ISSET(stat = inb(pio(iobase , com_lsr)), LSR_TXRDY) && --timo)
;
/* clear any interrupts generated by this transmission */
stat = inb(pio(iobase , com_iir));
splx(s);
}
void
comcnpollc(dev_t dev, int on)
{
}