/* $OpenBSD: com.c,v 1.50 1999/08/08 16:28:17 niklas Exp $ */ /* $NetBSD: com.c,v 1.82.4.1 1996/06/02 09:08:00 mrg Exp $ */ /*- * Copyright (c) 1993, 1994, 1995, 1996 * 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 #define com_lcr com_cfcr #ifndef NULL #define NULL 0 #endif /* XXX: These belong elsewhere */ cdev_decl(com); bdev_decl(com); static u_char tiocm_xxx2mcr __P((int)); /* * XXX the following two cfattach structs should be different, and possibly * XXX elsewhere. */ int comprobe __P((struct device *, void *, void *)); void comattach __P((struct device *, struct device *, void *)); void compwroff __P((struct com_softc *)); void com_raisedtr __P((void *)); #if NCOM_ISA struct cfattach com_isa_ca = { sizeof(struct com_softc), comprobe, comattach }; #endif #if NCOM_ISAPNP struct cfattach com_isapnp_ca = { sizeof(struct com_softc), comprobe, comattach }; #endif struct cfdriver com_cd = { NULL, "com", DV_TTY }; #ifndef CONSPEED #define CONSPEED B9600 #endif #ifdef COMCONSOLE int comdefaultrate = CONSPEED; /* XXX why set default? */ #else int comdefaultrate = TTYDEF_SPEED; #endif int comconsaddr; int comconsinit; int comconsattached; bus_space_tag_t comconsiot; bus_space_handle_t comconsioh; tcflag_t comconscflag = TTYDEF_CFLAG; 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 DEVUNIT(x) (minor(x) & 0x7f) #define DEVCUA(x) (minor(x) & 0x80) /* Macros to clear/set/test flags. */ #define SET(t, f) (t) |= (f) #define CLR(t, f) (t) &= ~(f) #define ISSET(t, f) ((t) & (f)) /* Macros for determining bus type. */ #if NCOM_ISA #define IS_ISA(parent) \ (strcmp((parent)->dv_cfdata->cf_driver->cd_name, "isa") == 0) #else #define IS_ISA(parent) 0 #endif #if NCOM_ISAPNP #define IS_ISAPNP(parent) \ (strcmp((parent)->dv_cfdata->cf_driver->cd_name, "isapnp") == 0) #else #define IS_ISAPNP(parent) 0 #endif 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(iot, ioh) bus_space_tag_t iot; bus_space_handle_t ioh; { int i, k; /* force access to id reg */ bus_space_write_1(iot, ioh, com_lcr, 0); bus_space_write_1(iot, ioh, com_iir, 0); for (i = 0; i < 32; i++) { k = bus_space_read_1(iot, ioh, com_iir); if (k & 0x38) { bus_space_read_1(iot, ioh, com_data); /* cleanup */ } else break; } if (i >= 32) return 0; return 1; } int comprobe(parent, match, aux) struct device *parent; void *match, *aux; { bus_space_tag_t iot; bus_space_handle_t ioh; int iobase, needioh; int rv = 1; /* * XXX should be broken out into functions for isa probe and * XXX for commulti probe, with a helper function that contains * XXX most of the interesting stuff. */ #if NCOM_ISA || NCOM_ISAPNP if (IS_ISA(parent) || IS_ISAPNP(parent)) { struct isa_attach_args *ia = aux; iot = ia->ia_iot; iobase = ia->ia_iobase; if (IS_ISAPNP(parent)) { ioh = ia->ia_ioh; needioh = 0; } else needioh = 1; } else #endif return(0); /* This cannot happen */ /* if it's in use as console, it's there. */ if (iobase == comconsaddr && !comconsattached) goto out; if (needioh && bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { rv = 0; goto out; } rv = comprobe1(iot, ioh); if (needioh) bus_space_unmap(iot, ioh, COM_NPORTS); out: #if NCOM_ISA if (rv && IS_ISA(parent)) { struct isa_attach_args *ia = aux; ia->ia_iosize = COM_NPORTS; ia->ia_msize = 0; } #endif return (rv); } void comattach(parent, self, aux) struct device *parent, *self; void *aux; { struct com_softc *sc = (void *)self; int iobase, irq; bus_space_tag_t iot; bus_space_handle_t ioh; u_int8_t lcr; /* * XXX should be broken out into functions for isa attach and * XXX for commulti attach, with a helper function that contains * XXX most of the interesting stuff. */ sc->sc_hwflags = 0; sc->sc_swflags = 0; #if NCOM_ISA || NCOM_ISAPNP if (IS_ISA(parent) || IS_ISAPNP(parent)) { struct isa_attach_args *ia = aux; /* * We're living on an isa. */ iobase = ia->ia_iobase; iot = ia->ia_iot; if (IS_ISAPNP(parent)) { /* No console support! */ ioh = ia->ia_ioh; } else { if (iobase != comconsaddr) { if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) panic("comattach: io mapping failed"); } else ioh = comconsioh; } irq = ia->ia_irq; } else #endif panic("comattach: impossible"); sc->sc_iot = iot; sc->sc_ioh = ioh; sc->sc_iobase = iobase; if (iobase == comconsaddr) { comconsattached = 1; /* * Need to reset baud rate, etc. of next print so reset * comconsinit. Also make sure console is always "hardwired". */ delay(1000); /* wait for output to finish */ comconsinit = 0; SET(sc->sc_hwflags, COM_HW_CONSOLE); SET(sc->sc_swflags, COM_SW_SOFTCAR); } /* * Probe for all known forms of UART. */ lcr = bus_space_read_1(iot, ioh, com_lcr); bus_space_write_1(iot, ioh, com_lcr, 0xbf); bus_space_write_1(iot, ioh, com_efr, 0); bus_space_write_1(iot, ioh, com_lcr, 0); bus_space_write_1(iot, ioh, com_fifo, FIFO_ENABLE); delay(100); switch(bus_space_read_1(iot, ioh, com_iir) >> 6) { case 0: sc->sc_uarttype = COM_UART_16450; break; case 2: sc->sc_uarttype = COM_UART_16550; break; case 3: sc->sc_uarttype = COM_UART_16550A; break; default: sc->sc_uarttype = COM_UART_UNKNOWN; break; } if (sc->sc_uarttype == COM_UART_16550A) { /* Probe for ST16650s */ bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB); if (bus_space_read_1(iot, ioh, com_efr) == 0) { sc->sc_uarttype = COM_UART_ST16650; } else { bus_space_write_1(iot, ioh, com_lcr, 0xbf); if (bus_space_read_1(iot, ioh, com_efr) == 0) sc->sc_uarttype = COM_UART_ST16650V2; } } bus_space_write_1(iot, ioh, com_lcr, lcr); if (sc->sc_uarttype == COM_UART_16450) { /* Probe for 8250 */ u_int8_t scr0, scr1, scr2; scr0 = bus_space_read_1(iot, ioh, com_scratch); bus_space_write_1(iot, ioh, com_scratch, 0xa5); scr1 = bus_space_read_1(iot, ioh, com_scratch); bus_space_write_1(iot, ioh, com_scratch, 0x5a); scr2 = bus_space_read_1(iot, ioh, com_scratch); bus_space_write_1(iot, ioh, com_scratch, scr0); if ((scr1 != 0xa5) || (scr2 != 0x5a)) sc->sc_uarttype = COM_UART_8250; } /* * Print UART type and initialize ourself. */ sc->sc_fifolen = 1; /* default */ switch (sc->sc_uarttype) { case COM_UART_UNKNOWN: printf(": unknown uart\n"); break; case COM_UART_8250: printf(": ns8250, no fifo\n"); break; case COM_UART_16450: printf(": ns16450, no fifo\n"); break; case COM_UART_16550: printf(": ns16550, no working fifo\n"); break; case COM_UART_16550A: printf(": ns16550a, 16 byte fifo\n"); SET(sc->sc_hwflags, COM_HW_FIFO); sc->sc_fifolen = 16; break; case COM_UART_ST16650: printf(": st16650, no working fifo\n"); break; case COM_UART_ST16650V2: printf(": st16650, 32 byte fifo\n"); SET(sc->sc_hwflags, COM_HW_FIFO); sc->sc_fifolen = 32; break; case COM_UART_TI16750: printf(": ti16750, 64 byte fifo\n"); SET(sc->sc_hwflags, COM_HW_FIFO); sc->sc_fifolen = 64; break; default: panic("comattach: bad fifo type"); } /* clear and disable fifo */ bus_space_write_1(iot, ioh, com_fifo, FIFO_RCV_RST | FIFO_XMT_RST); (void)bus_space_read_1(iot, ioh, com_data); bus_space_write_1(iot, ioh, com_fifo, 0); /* disable interrupts */ bus_space_write_1(iot, ioh, com_ier, 0); bus_space_write_1(iot, ioh, com_mcr, 0); /* XXX maybe move up some? */ if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) printf("%s: console\n", sc->sc_dev.dv_xname); /* * If there are no enable/disable functions, assume the device * is always enabled. */ if (!sc->enable) sc->enabled = 1; } int com_detach(self, flags) struct device *self; int flags; { struct com_softc *sc = (struct com_softc *)self; int maj, mn; /* locate the major number */ for (maj = 0; maj < nchrdev; maj++) if (cdevsw[maj].d_open == comopen) break; /* Nuke the vnodes for any open instances. */ mn = self->dv_unit; vdevgone(maj, mn, mn, VCHR); /* XXX a symbolic constant for the cua bit would be nicer. */ mn |= 0x80; vdevgone(maj, mn, mn, VCHR); /* Detach and free the tty. */ if (sc->sc_tty) { tty_detach(sc->sc_tty); ttyfree(sc->sc_tty); } untimeout(compoll, NULL); untimeout(com_raisedtr, sc); untimeout(comdiag, sc); return (0); } int com_activate(self, act) struct device *self; enum devact act; { struct com_softc *sc = (struct com_softc *)self; int s, rv = 0; s = spltty(); switch (act) { case DVACT_ACTIVATE: rv = EOPNOTSUPP; break; case DVACT_DEACTIVATE: if (sc->sc_hwflags & COM_HW_CONSOLE) { rv = EBUSY; break; } if (sc->disable != NULL && sc->enabled != 0) { (*sc->disable)(sc); sc->enabled = 0; } break; } splx(s); return (rv); } int comopen(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { int unit = DEVUNIT(dev); struct com_softc *sc; bus_space_tag_t iot; bus_space_handle_t ioh; struct tty *tp; int s; int error = 0; if (unit >= com_cd.cd_ndevs) return ENXIO; sc = com_cd.cd_devs[unit]; if (!sc) return ENXIO; s = spltty(); if (!sc->sc_tty) { tp = sc->sc_tty = ttymalloc(); tty_attach(tp); } else tp = sc->sc_tty; splx(s); 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; if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) tp->t_cflag = comconscflag; else 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(); sc->sc_initialize = 1; 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; iot = sc->sc_iot; ioh = sc->sc_ioh; /* * Wake up the sleepy heads. */ switch (sc->sc_uarttype) { case COM_UART_ST16650: case COM_UART_ST16650V2: bus_space_write_1(iot, ioh, com_lcr, 0xbf); bus_space_write_1(iot, ioh, com_efr, EFR_ECB); bus_space_write_1(iot, ioh, com_ier, 0); bus_space_write_1(iot, ioh, com_efr, 0); bus_space_write_1(iot, ioh, com_lcr, 0); break; case COM_UART_TI16750: bus_space_write_1(iot, ioh, com_ier, 0); break; } if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) { u_int8_t fifo = FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST; u_int8_t lcr; if (tp->t_ispeed <= 1200) fifo |= FIFO_TRIGGER_1; else fifo |= FIFO_TRIGGER_8; if (sc->sc_uarttype == COM_UART_TI16750) { fifo |= FIFO_ENABLE_64BYTE; lcr = bus_space_read_1(iot, ioh, com_lcr); bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB); } /* * (Re)enable and drain FIFOs. * * Certain SMC chips cause problems if the FIFOs are * enabled while input is ready. Turn off the FIFO * if necessary to clear the input. Test the input * ready bit after enabling the FIFOs to handle races * between enabling and fresh input. * * Set the FIFO threshold based on the receive speed. */ for (;;) { bus_space_write_1(iot, ioh, com_fifo, 0); delay(100); (void) bus_space_read_1(iot, ioh, com_data); bus_space_write_1(iot, ioh, com_fifo, fifo | FIFO_RCV_RST | FIFO_XMT_RST); delay(100); if(!ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) break; } if (sc->sc_uarttype == COM_UART_TI16750) bus_space_write_1(iot, ioh, com_lcr, lcr); } /* flush any pending I/O */ while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) (void) bus_space_read_1(iot, ioh, 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); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); sc->sc_msr = bus_space_read_1(iot, ioh, com_msr); if (ISSET(sc->sc_swflags, COM_SW_SOFTCAR) || DEVCUA(dev) || 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(); if (DEVCUA(dev)) { if (ISSET(tp->t_state, TS_ISOPEN)) { /* Ah, but someone already is dialed in... */ splx(s); return EBUSY; } sc->sc_cua = 1; /* We go into CUA mode */ } else { /* tty (not cua) device; wait for carrier if necessary */ if (ISSET(flag, O_NONBLOCK)) { if (sc->sc_cua) { /* Opening TTY non-blocking... but the CUA is busy */ splx(s); return EBUSY; } } else { while (sc->sc_cua || (!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 TS_WOPEN has been reset, that means the cua device * has been closed. We don't want to fail in that case, * so just go around again. */ if (error && ISSET(tp->t_state, TS_WOPEN)) { CLR(tp->t_state, TS_WOPEN); if (!sc->sc_cua && !ISSET(tp->t_state, TS_ISOPEN)) compwroff(sc); 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 = DEVUNIT(dev); struct com_softc *sc = com_cd.cd_devs[unit]; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; struct tty *tp = sc->sc_tty; 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(); if (ISSET(tp->t_state, TS_WOPEN)) { /* tty device is waiting for carrier; drop dtr then re-raise */ CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); timeout(com_raisedtr, sc, hz * 2); } else { /* no one else waiting; turn off the uart */ compwroff(sc); } CLR(tp->t_state, TS_BUSY | TS_FLUSH); if (--comsopen == 0) untimeout(compoll, NULL); sc->sc_cua = 0; splx(s); ttyclose(tp); #ifdef notyet /* XXXX */ if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { ttyfree(tp); sc->sc_tty = 0; } #endif return 0; } void compwroff(sc) struct com_softc *sc; { bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; struct tty *tp = sc->sc_tty; CLR(sc->sc_lcr, LCR_SBREAK); bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); bus_space_write_1(iot, ioh, com_ier, 0); if (ISSET(tp->t_cflag, HUPCL) && !ISSET(sc->sc_swflags, COM_SW_SOFTCAR)) { /* XXX perhaps only clear DTR */ sc->sc_mcr = 0; bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); } /* * Turn FIFO off; enter sleep mode if possible. */ bus_space_write_1(iot, ioh, com_fifo, 0); delay(100); (void) bus_space_read_1(iot, ioh, com_data); delay(100); bus_space_write_1(iot, ioh, com_fifo, FIFO_RCV_RST | FIFO_XMT_RST); switch (sc->sc_uarttype) { case COM_UART_ST16650: case COM_UART_ST16650V2: bus_space_write_1(iot, ioh, com_lcr, 0xbf); bus_space_write_1(iot, ioh, com_efr, EFR_ECB); bus_space_write_1(iot, ioh, com_ier, IER_SLEEP); bus_space_write_1(iot, ioh, com_lcr, 0); break; case COM_UART_TI16750: bus_space_write_1(iot, ioh, com_ier, IER_SLEEP); break; } } void com_raisedtr(arg) void *arg; { struct com_softc *sc = arg; SET(sc->sc_mcr, MCR_DTR | MCR_RTS); bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); } int comread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct com_softc *sc = com_cd.cd_devs[DEVUNIT(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 = com_cd.cd_devs[DEVUNIT(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 = com_cd.cd_devs[DEVUNIT(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 = DEVUNIT(dev); struct com_softc *sc = com_cd.cd_devs[unit]; struct tty *tp = sc->sc_tty; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; 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); bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); break; case TIOCCBRK: CLR(sc->sc_lcr, LCR_SBREAK); bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); break; case TIOCSDTR: SET(sc->sc_mcr, sc->sc_dtr); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); break; case TIOCCDTR: CLR(sc->sc_mcr, sc->sc_dtr); bus_space_write_1(iot, ioh, 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)); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); break; case TIOCMBIC: CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); bus_space_write_1(iot, ioh, 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 (bus_space_read_1(iot, ioh, 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); if (ISSET(driverbits, COM_SW_PPS)) SET(userbits, TIOCFLAG_PPS); *(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); if (ISSET(userbits, TIOCFLAG_PPS)) SET(driverbits, COM_SW_PPS); sc->sc_swflags = driverbits; break; } default: return ENOTTY; } return 0; } int comparam(tp, t) struct tty *tp; struct termios *t; { struct com_softc *sc = com_cd.cd_devs[DEVUNIT(tp->t_dev)]; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; 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); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); } /* * Set the FIFO threshold based on the receive speed, if we are * changing it. */ if (sc->sc_initialize || (tp->t_ispeed != t->c_ispeed)) { sc->sc_initialize = 0; if (ospeed != 0) { /* * Make sure the transmit FIFO is empty before * proceeding. If we don't do this, some revisions * of the UART will hang. Interestingly enough, * even if we do this while the last character is * still being pushed out, they don't hang. This * seems good enough. */ 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); } } bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB); bus_space_write_1(iot, ioh, com_dlbl, ospeed); bus_space_write_1(iot, ioh, com_dlbh, ospeed >> 8); bus_space_write_1(iot, ioh, com_lcr, lcr); SET(sc->sc_mcr, MCR_DTR); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); } else bus_space_write_1(iot, ioh, com_lcr, lcr); if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP) && ISSET(sc->sc_hwflags, COM_HW_FIFO)) { if (sc->sc_uarttype == COM_UART_TI16750) { bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB); bus_space_write_1(iot, ioh, com_fifo, FIFO_ENABLE | FIFO_ENABLE_64BYTE | (t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8)); bus_space_write_1(iot, ioh, com_lcr, lcr); } else bus_space_write_1(iot, ioh, com_fifo, FIFO_ENABLE | (t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8)); } } else bus_space_write_1(iot, ioh, 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); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); } } else { if (ISSET(sc->sc_mcr, MCR_RTS)) { CLR(sc->sc_mcr, MCR_RTS); bus_space_write_1(iot, ioh, 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); bus_space_write_1(iot, ioh, 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 = com_cd.cd_devs[DEVUNIT(tp->t_dev)]; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; int s; 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 (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 stopped; selwakeup(&tp->t_wsel); } SET(tp->t_state, TS_BUSY); if (!ISSET(sc->sc_ier, IER_ETXRDY)) { SET(sc->sc_ier, IER_ETXRDY); bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); } if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) { u_char buffer[64]; /* XXX: largest fifo */ u_char *cp = buffer; int n = q_to_b(&tp->t_outq, cp, sc->sc_fifolen); do { bus_space_write_1(iot, ioh, com_data, *cp++); } while (--n); } else bus_space_write_1(iot, ioh, com_data, getc(&tp->t_outq)); out: splx(s); return; stopped: if (ISSET(sc->sc_ier, IER_ETXRDY)) { CLR(sc->sc_ier, IER_ETXRDY); bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); } splx(s); } /* * Stop output on a line. */ int comstop(tp, flag) 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); return 0; } 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 < com_cd.cd_ndevs; unit++) { sc = com_cd.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); bus_space_write_1(sc->sc_iot, sc->sc_ioh, 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; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; struct tty *tp; u_char lsr, data, msr, delta; #ifdef PPS_SYNC struct timeval tv; long usec; #endif /* PPS_SYNC */ #ifdef COM_DEBUG int n; struct { u_char iir, lsr, msr; } iter[32]; #endif if (!sc->sc_tty) return (0); /* can't do squat. */ #ifdef COM_DEBUG n = 0; if (ISSET(iter[n].iir = bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND)) return (0); #else if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND)) return (0); #endif tp = sc->sc_tty; for (;;) { #ifdef COM_DEBUG iter[n].lsr = #endif lsr = bus_space_read_1(iot, ioh, com_lsr); if (ISSET(lsr, LSR_RXRDY)) { register u_char *p = sc->sc_ibufp; comevents = 1; do { data = bus_space_read_1(iot, ioh, com_data); if (ISSET(lsr, LSR_BI)) { #ifdef notdef printf("break %02x %02x %02x %02x\n", sc->sc_msr, sc->sc_mcr, sc->sc_lcr, sc->sc_dtr); #endif #ifdef DDB if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { if (db_console) 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); bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr); } } #ifdef DDB next: #endif #ifdef COM_DEBUG if (++n >= 32) goto ohfudge; iter[n].lsr = #endif lsr = bus_space_read_1(iot, ioh, com_lsr); } while (ISSET(lsr, LSR_RXRDY)); sc->sc_ibufp = p; } #ifdef COM_DEBUG else if (ISSET(lsr, LSR_BI|LSR_FE|LSR_PE|LSR_OE)) printf("weird lsr %02x\n", lsr); #endif #ifdef COM_DEBUG iter[n].msr = #endif msr = bus_space_read_1(iot, ioh, com_msr); if (msr != sc->sc_msr) { delta = msr ^ sc->sc_msr; sc->sc_msr = msr; if (ISSET(delta, MSR_DCD)) { #ifdef PPS_SYNC if (ISSET(sc->sc_swflags, COM_SW_PPS)) { if (ISSET(msr, MSR_DCD)) { usec = time.tv_usec; microtime(&tv); usec = tv.tv_usec - usec; if (usec < 0) usec += 1000000; hardpps(&tv, usec); } } else #endif /* PPS_SYNC */ if (!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); bus_space_write_1(iot, ioh, 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 | TS_FLUSH); if (sc->sc_halt > 0) wakeup(&tp->t_outq); (*linesw[tp->t_line].l_start)(tp); } #ifdef COM_DEBUG if (++n >= 32) goto ohfudge; if (ISSET(iter[n].iir = bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND)) return (1); #else if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_NOPEND)) return (1); #endif } #ifdef COM_DEBUG ohfudge: printf("comintr: too many iterations"); for (n = 0; n < 32; n++) { if ((n % 4) == 0) printf("\ncomintr: iter[%02d]", n); printf(" %02x %02x %02x", iter[n].iir, iter[n].lsr, iter[n].msr); } printf("\n"); printf("comintr: msr %02x mcr %02x lcr %02x ier %02x\n", sc->sc_msr, sc->sc_mcr, sc->sc_lcr, sc->sc_ier); printf("comintr: state %08x cc %d\n", sc->sc_tty->t_state, sc->sc_tty->t_outq.c_cc); #endif } /* * Following are all routines needed for COM to act as console */ #include #ifdef arc #undef CONADDR extern int CONADDR; #endif void comcnprobe(cp) struct consdev *cp; { /* XXX NEEDS TO BE FIXED XXX */ #ifdef arc bus_space_tag_t iot = &arc_bus_io; #else #ifdef powerpc bus_space_tag_t iot = &p4e_isa_io; #else bus_space_tag_t iot = 0; #endif #endif bus_space_handle_t ioh; int found; if(CONADDR == 0) { cp->cn_pri = CN_DEAD; return; } comconsiot = iot; if (bus_space_map(iot, CONADDR, COM_NPORTS, 0, &ioh)) { cp->cn_pri = CN_DEAD; return; } found = comprobe1(iot, ioh); bus_space_unmap(iot, ioh, COM_NPORTS); if (!found) { 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; { if (bus_space_map(comconsiot, CONADDR, COM_NPORTS, 0, &comconsioh)) panic("comcninit: mapping failed"); cominit(comconsiot, comconsioh, comdefaultrate); comconsaddr = CONADDR; comconsinit = 0; } void cominit(iot, ioh, rate) bus_space_tag_t iot; bus_space_handle_t ioh; int rate; { int s = splhigh(); u_char stat; bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); rate = comspeed(comdefaultrate); bus_space_write_1(iot, ioh, com_dlbl, rate); bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); bus_space_write_1(iot, ioh, com_lcr, LCR_8BITS); bus_space_write_1(iot, ioh, com_ier, IER_ERXRDY | IER_ETXRDY); bus_space_write_1(iot, ioh, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4); stat = bus_space_read_1(iot, ioh, com_iir); splx(s); } int comcngetc(dev) dev_t dev; { int s = splhigh(); bus_space_tag_t iot = comconsiot; bus_space_handle_t ioh = comconsioh; u_char stat, c; while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) ; c = bus_space_read_1(iot, ioh, com_data); stat = bus_space_read_1(iot, ioh, com_iir); splx(s); return c; } /* * Console kernel output character routine. */ void comcnputc(dev, c) dev_t dev; int c; { int s = splhigh(); bus_space_tag_t iot = comconsiot; bus_space_handle_t ioh = comconsioh; u_char stat; register int timo; #ifdef KGDB if (dev != kgdb_dev) #endif if (comconsinit == 0) { cominit(iot, ioh, comdefaultrate); comconsinit = 1; } /* wait for any pending transmission to finish */ timo = 50000; while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) ; bus_space_write_1(iot, ioh, com_data, c); /* wait for this transmission to complete */ timo = 1500000; while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) && --timo) ; #if 0 /* I don't think sooooo (pefo) */ /* clear any interrupts generated by this transmission */ stat = bus_space_read_1(iot, ioh, com_iir); #endif splx(s); } void comcnpollc(dev, on) dev_t dev; int on; { }