/* $NetBSD: com.c,v 1.66 1996/02/17 04:04:28 mycroft Exp $ */ /*- * Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved. * 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. 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. * * @(#)com.c 7.5 (Berkeley) 5/16/91 */ /* * COM driver, based on HP dca driver * uses National Semiconductor NS16450/NS16550AF UART */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef COM_HAYESP #include #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; 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; u_char sc_dtr; u_char *sc_ibuf, *sc_ibufp, *sc_ibufhigh, *sc_ibufend; u_char sc_ibufs[2][COM_IBUFSIZE]; }; int comprobe __P((struct device *, void *, void *)); void comattach __P((struct device *, struct device *, void *)); int comopen __P((dev_t, int, int, struct proc *)); int comclose __P((dev_t, int, int, struct proc *)); void comdiag __P((void *)); int comintr __P((void *)); void compoll __P((void *)); int comparam __P((struct tty *, struct termios *)); void comstart __P((struct tty *)); struct cfdriver comcd = { NULL, "com", comprobe, comattach, DV_TTY, sizeof(struct com_softc) }; #ifdef COMCONSOLE int comdefaultrate = CONSPEED; int comconsole = COMCONSOLE; #else int comdefaultrate = TTYDEF_SPEED; int comconsole = -1; #endif int comconsinit; int commajor; int comsopen = 0; int comevents = 0; #ifdef KGDB #include extern int kgdb_dev; extern int kgdb_rate; extern int kgdb_debug_init; #endif #define COMUNIT(x) (minor(x)) /* Macros to clear/set/test flags. */ #define SET(t, f) (t) |= (f) #define CLR(t, f) (t) &= ~(f) #define ISSET(t, f) ((t) & (f)) int comspeed(speed) 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(n, q) } int comprobe1(iobase) int iobase; { /* force access to id reg */ outb(iobase + com_lcr, 0); outb(iobase + com_iir, 0); if (inb(iobase + com_iir) & 0x38) return 0; return 1; } #ifdef COM_HAYESP int comprobeHAYESP(iobase, sc) 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(", 1024k fifo\n"); return 1; } #endif int comprobe(parent, match, aux) struct device *parent; void *match, *aux; { struct isa_attach_args *ia = aux; int iobase = ia->ia_iobase; if (!comprobe1(iobase)) return 0; ia->ia_iosize = COM_NPORTS; ia->ia_msize = 0; return 1; } void comattach(parent, self, aux) struct device *parent, *self; void *aux; { struct com_softc *sc = (void *)self; struct isa_attach_args *ia = aux; struct cfdata *cf = sc->sc_dev.dv_cfdata; int iobase = ia->ia_iobase; struct tty *tp; #ifdef COM_HAYESP int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; int *hayespp; #endif sc->sc_iobase = iobase; sc->sc_hwflags = ISSET(cf->cf_flags, COM_HW_NOIEN); sc->sc_swflags = 0; if (sc->sc_dev.dv_unit == comconsole) delay(1000); #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(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); delay(100); if (ISSET(inb(iobase + com_iir), IIR_FIFO_MASK) == IIR_FIFO_MASK) if (ISSET(inb(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(iobase + com_fifo, 0); #ifdef COM_HAYESP } #endif /* disable interrupts */ outb(iobase + com_ier, 0); outb(iobase + com_mcr, 0); if (ia->ia_irq != IRQUNK) sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_EDGE, IPL_TTY, comintr, sc); #ifdef KGDB if (kgdb_dev == makedev(commajor, unit)) { if (comconsole == unit) kgdb_dev = -1; /* can't debug over console port */ else { (void) cominit(unit, kgdb_rate); if (kgdb_debug_init) { /* * Print prefix of device name, * let kgdb_connect print the rest. */ printf("%s: ", sc->sc_dev.dv_xname); kgdb_connect(1); } else printf("%s: kgdb enabled\n", sc->sc_dev.dv_xname); } } #endif if (sc->sc_dev.dv_unit == comconsole) { /* * 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, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { int unit = COMUNIT(dev); struct com_softc *sc; int iobase; struct tty *tp; int s; int error = 0; if (unit >= comcd.cd_ndevs) return ENXIO; sc = comcd.cd_devs[unit]; if (!sc) return ENXIO; if (!sc->sc_tty) tp = sc->sc_tty = ttymalloc(); else tp = sc->sc_tty; tp->t_oproc = comstart; tp->t_param = comparam; tp->t_dev = dev; if (!ISSET(tp->t_state, TS_ISOPEN)) { SET(tp->t_state, TS_WOPEN); 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; s = spltty(); comparam(tp, &tp->t_termios); ttsetwater(tp); if (comsopen++ == 0) timeout(compoll, NULL, 1); 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(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(iobase + com_lsr), LSR_RXRDY)) (void) inb(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); outb(iobase + com_mcr, sc->sc_mcr); outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC); sc->sc_msr = inb(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); } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) return EBUSY; else s = spltty(); /* wait for carrier if necessary */ if (!ISSET(flag, O_NONBLOCK)) while (!ISSET(tp->t_cflag, CLOCAL) && !ISSET(tp->t_state, TS_CARR_ON)) { SET(tp->t_state, TS_WOPEN); error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, ttopen, 0); if (error) { /* XXX should turn off chip if we're the only waiter */ splx(s); return error; } } splx(s); return (*linesw[tp->t_line].l_open)(dev, tp); } int comclose(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { int unit = COMUNIT(dev); struct com_softc *sc = comcd.cd_devs[unit]; 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; (*linesw[tp->t_line].l_close)(tp, flag); s = spltty(); CLR(sc->sc_lcr, LCR_SBREAK); outb(iobase + com_lcr, sc->sc_lcr); outb(iobase + com_ier, 0); if (ISSET(tp->t_cflag, HUPCL) && !ISSET(sc->sc_swflags, COM_SW_SOFTCAR)) { /* XXX perhaps only clear DTR */ outb(iobase + com_mcr, 0); } CLR(tp->t_state, TS_BUSY | TS_FLUSH); if (--comsopen == 0) untimeout(compoll, NULL); splx(s); ttyclose(tp); #ifdef notyet /* XXXX */ if (unit != comconsole) { ttyfree(tp); sc->sc_tty = 0; } #endif return 0; } int comread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)]; struct tty *tp = sc->sc_tty; return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); } int comwrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)]; struct tty *tp = sc->sc_tty; return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); } struct tty * comtty(dev) dev_t dev; { struct com_softc *sc = comcd.cd_devs[COMUNIT(dev)]; struct tty *tp = sc->sc_tty; return (tp); } static u_char tiocm_xxx2mcr(data) 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, cmd, data, flag, p) dev_t dev; u_long cmd; caddr_t data; int flag; struct proc *p; { int unit = COMUNIT(dev); struct com_softc *sc = comcd.cd_devs[unit]; struct tty *tp = sc->sc_tty; int iobase = sc->sc_iobase; int error; 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: SET(sc->sc_lcr, LCR_SBREAK); outb(iobase + com_lcr, sc->sc_lcr); break; case TIOCCBRK: CLR(sc->sc_lcr, LCR_SBREAK); outb(iobase + com_lcr, sc->sc_lcr); break; case TIOCSDTR: SET(sc->sc_mcr, sc->sc_dtr); outb(iobase + com_mcr, sc->sc_mcr); break; case TIOCCDTR: CLR(sc->sc_mcr, sc->sc_dtr); outb(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(iobase + com_mcr, sc->sc_mcr); break; case TIOCMBIC: CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); outb(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(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 = suser(p->p_ucred, &p->p_acflag); 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 ENOTTY; } return 0; } int comparam(tp, t) struct tty *tp; struct termios *t; { struct com_softc *sc = comcd.cd_devs[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(iobase + com_mcr, sc->sc_mcr); } /* * Set the FIFO threshold based on the receive speed, if we are * changing it. */ #if 1 if (tp->t_ispeed != t->c_ispeed) { #else if (1) { #endif if (ospeed != 0) { /* * Make sure the transmit FIFO is empty before * proceeding. */ while (ISSET(tp->t_state, TS_BUSY)) { int error; ++sc->sc_halt; error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, "comprm", 0); --sc->sc_halt; if (error) { splx(s); comstart(tp); return (error); } } outb(iobase + com_lcr, lcr | LCR_DLAB); outb(iobase + com_dlbl, ospeed); outb(iobase + com_dlbh, ospeed >> 8); outb(iobase + com_lcr, lcr); SET(sc->sc_mcr, MCR_DTR); outb(iobase + com_mcr, sc->sc_mcr); } else outb(iobase + com_lcr, lcr); if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP) && ISSET(sc->sc_hwflags, COM_HW_FIFO)) outb(iobase + com_fifo, FIFO_ENABLE | (t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8)); } else outb(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(iobase + com_mcr, sc->sc_mcr); } } else { if (ISSET(sc->sc_mcr, MCR_RTS)) { CLR(sc->sc_mcr, MCR_RTS); outb(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) && (*linesw[tp->t_line].l_modem)(tp, 0) == 0) { CLR(sc->sc_mcr, sc->sc_dtr); outb(iobase + com_mcr, sc->sc_mcr); } /* Just to be sure... */ splx(s); comstart(tp); return 0; } void comstart(tp) struct tty *tp; { struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)]; int iobase = sc->sc_iobase; int s; s = spltty(); if (ISSET(tp->t_state, TS_TTSTOP | TS_BUSY)) goto out; if (sc->sc_halt > 0) goto out; if (ISSET(tp->t_cflag, CRTSCTS) && !ISSET(sc->sc_msr, MSR_CTS)) goto out; if (tp->t_outq.c_cc <= tp->t_lowat) { if (ISSET(tp->t_state, TS_ASLEEP)) { CLR(tp->t_state, TS_ASLEEP); wakeup(&tp->t_outq); } if (tp->t_outq.c_cc == 0) goto out; selwakeup(&tp->t_wsel); } SET(tp->t_state, TS_BUSY); #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(iobase + com_data, *cp++); } while (--n); } else outb(iobase + com_data, getc(&tp->t_outq)); out: splx(s); } /* * Stop output on a line. */ void comstop(tp, flag) struct tty *tp; { 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); } void comdiag(arg) 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"); } void compoll(arg) void *arg; { int unit; struct com_softc *sc; struct tty *tp; register u_char *ibufp; u_char *ibufend; register 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 < comcd.cd_ndevs; unit++) { sc = comcd.cd_devs[unit]; if (sc == 0 || 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(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) timeout(comdiag, sc, 60 * hz); } /* This is ugly, but fast. */ c |= lsrmap[(*ibufp++ & (LSR_BI|LSR_FE|LSR_PE)) >> 2]; (*linesw[tp->t_line].l_rint)(c, tp); } } out: timeout(compoll, NULL, 1); } int comintr(arg) void *arg; { struct com_softc *sc = arg; int iobase = sc->sc_iobase; struct tty *tp; u_char lsr, data, msr, delta; if (ISSET(inb(iobase + com_iir), IIR_NOPEND)) return (0); tp = sc->sc_tty; for (;;) { lsr = inb(iobase + com_lsr); if (ISSET(lsr, LSR_RCV_MASK)) { register u_char *p = sc->sc_ibufp; comevents = 1; do { data = ISSET(lsr, LSR_RXRDY) ? inb(iobase + com_data) : 0; if (ISSET(lsr, LSR_BI)) { #ifdef DDB if (sc->sc_dev.dv_unit == comconsole) { Debugger(); goto next; } #endif data = '\0'; } if (p >= sc->sc_ibufend) { sc->sc_floods++; if (sc->sc_errors++ == 0) timeout(comdiag, sc, 60 * hz); } else { *p++ = data; *p++ = lsr; if (p == sc->sc_ibufhigh && ISSET(tp->t_cflag, CRTSCTS)) { /* XXX */ CLR(sc->sc_mcr, MCR_RTS); outb(iobase + com_mcr, sc->sc_mcr); } } next: lsr = inb(iobase + com_lsr); } while (ISSET(lsr, LSR_RCV_MASK)); sc->sc_ibufp = p; } #if 0 else if (ISSET(lsr, LSR_BI|LSR_FE|LSR_PE|LSR_OE)) printf("weird lsr %02x\n", lsr); #endif msr = inb(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) && (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)) == 0) { CLR(sc->sc_mcr, sc->sc_dtr); outb(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 */ (*linesw[tp->t_line].l_start)(tp); } } if (ISSET(lsr, LSR_TXRDY) && ISSET(tp->t_state, TS_BUSY)) { CLR(tp->t_state, TS_BUSY); if (sc->sc_halt > 0) wakeup(&tp->t_outq); else if (ISSET(tp->t_state, TS_FLUSH)) CLR(tp->t_state, TS_FLUSH); else (*linesw[tp->t_line].l_start)(tp); } if (ISSET(inb(iobase + com_iir), IIR_NOPEND)) return (1); } } /* * Following are all routines needed for COM to act as console */ #include void comcnprobe(cp) struct consdev *cp; { if (!comprobe1(CONADDR)) { cp->cn_pri = CN_DEAD; return; } /* locate the major number */ for (commajor = 0; commajor < nchrdev; commajor++) if (cdevsw[commajor].d_open == comopen) break; /* initialize required fields */ cp->cn_dev = makedev(commajor, CONUNIT); #ifdef COMCONSOLE cp->cn_pri = CN_REMOTE; /* Force a serial port console */ #else cp->cn_pri = CN_NORMAL; #endif } void comcninit(cp) struct consdev *cp; { cominit(CONUNIT, comdefaultrate); comconsole = CONUNIT; comconsinit = 0; } cominit(unit, rate) int unit, rate; { int s = splhigh(); int iobase = CONADDR; u_char stat; outb(iobase + com_lcr, LCR_DLAB); rate = comspeed(comdefaultrate); outb(iobase + com_dlbl, rate); outb(iobase + com_dlbh, rate >> 8); outb(iobase + com_lcr, LCR_8BITS); outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY); outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4); stat = inb(iobase + com_iir); splx(s); } comcngetc(dev) dev_t dev; { int s = splhigh(); int iobase = CONADDR; u_char stat, c; while (!ISSET(stat = inb(iobase + com_lsr), LSR_RXRDY)) ; c = inb(iobase + com_data); stat = inb(iobase + com_iir); splx(s); return c; } /* * Console kernel output character routine. */ void comcnputc(dev, c) dev_t dev; int c; { int s = splhigh(); int iobase = CONADDR; u_char stat; register int timo; #ifdef KGDB if (dev != kgdb_dev) #endif if (comconsinit == 0) { (void) cominit(COMUNIT(dev), comdefaultrate); comconsinit = 1; } /* wait for any pending transmission to finish */ timo = 50000; while (!ISSET(stat = inb(iobase + com_lsr), LSR_TXRDY) && --timo) ; outb(iobase + com_data, c); /* wait for this transmission to complete */ timo = 1500000; while (!ISSET(stat = inb(iobase + com_lsr), LSR_TXRDY) && --timo) ; /* clear any interrupts generated by this transmission */ stat = inb(iobase + com_iir); splx(s); } void comcnpollc(dev, on) dev_t dev; int on; { }