/*- * Copyright (c) 1994 Gordon W. Ross * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * 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, Lawrence Berkeley Laboratory. * * 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. * 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. * * @(#)zs.c 8.1 (Berkeley) 7/19/93 */ #include __FBSDID("$FreeBSD$"); /*- * Copyright (c) 2003 Jake Burkholder. * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * */ /* * Zilog Z8530 Dual UART driver. */ #include "opt_ddb.h" #include "opt_comconsole.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define ZS_READ(sc, r) \ bus_space_read_1((sc)->sc_bt, (r), 0) #define ZS_WRITE(sc, r, v) \ bus_space_write_1((sc)->sc_bt, (r), 0, (v)) #define ZS_READ_REG(sc, r) ({ \ ZS_WRITE((sc), (sc)->sc_csr, (r)); \ ZS_READ((sc), (sc)->sc_csr); \ }) #define ZS_WRITE_REG(sc, r, v) ({ \ ZS_WRITE((sc), (sc)->sc_csr, (r)); \ ZS_WRITE((sc), (sc)->sc_csr, (v)); \ }) #define ZSTTY_LOCK(sz) mtx_lock_spin(&(sc)->sc_mtx) #define ZSTTY_UNLOCK(sz) mtx_unlock_spin(&(sc)->sc_mtx) static void zs_softintr(void *v); static void zs_shutdown(void *v); static int zstty_intr(struct zstty_softc *sc, uint8_t rr3); static void zstty_softintr(struct zstty_softc *sc) __unused; static int zstty_mdmctrl(struct zstty_softc *sc, int bits, int how); static int zstty_param(struct zstty_softc *sc, struct tty *tp, struct termios *t); static void zstty_flush(struct zstty_softc *sc) __unused; static int zstty_speed(struct zstty_softc *sc, int rate); static void zstty_load_regs(struct zstty_softc *sc); static cn_probe_t zs_cnprobe; static cn_init_t zs_cninit; static cn_term_t zs_cnterm; static cn_getc_t zs_cngetc; static cn_checkc_t zs_cncheckc; static cn_putc_t zs_cnputc; static cn_dbctl_t zs_cndbctl; static int zstty_cngetc(struct zstty_softc *sc); static int zstty_cncheckc(struct zstty_softc *sc); static void zstty_cnputc(struct zstty_softc *sc, int c); static d_open_t zsttyopen; static d_close_t zsttyclose; static d_ioctl_t zsttyioctl; static void zsttystart(struct tty *tp); static void zsttystop(struct tty *tp, int rw); static int zsttyparam(struct tty *tp, struct termios *t); static struct cdevsw zstty_cdevsw = { .d_version = D_VERSION, .d_open = zsttyopen, .d_close = zsttyclose, .d_ioctl = zsttyioctl, .d_name = "zstty", .d_flags = D_TTY | D_NEEDGIANT, }; static struct zstty_softc *zstty_cons; CONS_DRIVER(zs, zs_cnprobe, zs_cninit, zs_cnterm, zs_cngetc, zs_cncheckc, zs_cnputc, zs_cndbctl); int zs_probe(device_t dev) { device_set_desc(dev, "Zilog Z8530"); return (0); } int zs_attach(device_t dev) { struct device *child[ZS_NCHAN]; struct zs_softc *sc; int i; sc = device_get_softc(dev); sc->sc_dev = dev; for (i = 0; i < ZS_NCHAN; i++) child[i] = device_add_child(dev, "zstty", -1); bus_generic_attach(dev); for (i = 0; i < ZS_NCHAN; i++) sc->sc_child[i] = device_get_softc(child[i]); swi_add(&tty_ithd, "tty:zs", zs_softintr, sc, SWI_TTY, INTR_TYPE_TTY, &sc->sc_softih); ZS_WRITE_REG(sc->sc_child[0], 2, sc->sc_child[0]->sc_creg[2]); ZS_WRITE_REG(sc->sc_child[0], 9, sc->sc_child[0]->sc_creg[9]); if (zstty_cons != NULL) { DELAY(50000); cninit(); } EVENTHANDLER_REGISTER(shutdown_final, zs_shutdown, sc, SHUTDOWN_PRI_DEFAULT); return (0); } void zs_intr(void *v) { struct zs_softc *sc = v; int needsoft; uint8_t rr3; /* * There is only one status register, which is on channel a. In order * to avoid needing to know which channel we're on in the tty interrupt * handler we shift the channel a status bits into the channel b * bit positions and always test the channel b bits. */ needsoft = 0; rr3 = ZS_READ_REG(sc->sc_child[0], 3); if ((rr3 & (ZSRR3_IP_A_RX | ZSRR3_IP_A_TX | ZSRR3_IP_A_STAT)) != 0) needsoft |= zstty_intr(sc->sc_child[0], rr3 >> 3); if ((rr3 & (ZSRR3_IP_B_RX | ZSRR3_IP_B_TX | ZSRR3_IP_B_STAT)) != 0) needsoft |= zstty_intr(sc->sc_child[1], rr3); if (needsoft) swi_sched(sc->sc_softih, 0); } static void zs_softintr(void *v) { struct zs_softc *sc = v; zstty_softintr(sc->sc_child[0]); zstty_softintr(sc->sc_child[1]); } static void zs_shutdown(void *v) { } int zstty_probe(device_t dev) { return (0); } int zstty_attach(device_t dev) { struct zstty_softc *sc; struct tty *tp; char mode[32]; int reset; int baud; int clen; char parity; int stop; char c; sc = device_get_softc(dev); mtx_init(&sc->sc_mtx, "zstty", NULL, MTX_SPIN); sc->sc_dev = dev; sc->sc_iput = sc->sc_iget = sc->sc_ibuf; sc->sc_oget = sc->sc_obuf; tp = ttymalloc(NULL); sc->sc_si = make_dev(&zstty_cdevsw, device_get_unit(dev), UID_ROOT, GID_WHEEL, 0600, "%s", device_get_desc(dev)); sc->sc_si->si_drv1 = sc; sc->sc_si->si_tty = tp; tp->t_dev = sc->sc_si; sc->sc_tty = tp; tp->t_oproc = zsttystart; tp->t_param = zsttyparam; tp->t_stop = zsttystop; tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_lflag = TTYDEF_LFLAG; tp->t_cflag = CREAD | CLOCAL | CS8; tp->t_ospeed = TTYDEF_SPEED; tp->t_ispeed = TTYDEF_SPEED; if (zstty_console(dev, mode, sizeof(mode))) { ttychars(tp); /* format: 9600,8,n,1,- */ if (sscanf(mode, "%d,%d,%c,%d,%c", &baud, &clen, &parity, &stop, &c) == 5) { tp->t_ospeed = baud; tp->t_ispeed = baud; tp->t_cflag = CREAD | CLOCAL; switch (clen) { case 5: tp->t_cflag |= CS5; break; case 6: tp->t_cflag |= CS6; break; case 7: tp->t_cflag |= CS7; break; case 8: default: tp->t_cflag |= CS8; break; } if (parity == 'e') tp->t_cflag |= PARENB; else if (parity == 'o') tp->t_cflag |= PARENB | PARODD; if (stop == 2) tp->t_cflag |= CSTOPB; } device_printf(dev, "console %s\n", mode); sc->sc_console = 1; zstty_cons = sc; } else { if ((device_get_unit(dev) & 1) == 0) reset = ZSWR9_A_RESET; else reset = ZSWR9_B_RESET; ZS_WRITE_REG(sc, 9, reset); } return (0); } /* * Note that the rr3 value is shifted so the channel a status bits are in the * channel b bit positions, which makes the bit positions uniform for both * channels. */ static int zstty_intr(struct zstty_softc *sc, uint8_t rr3) { int needsoft; uint8_t rr0; uint8_t rr1; uint8_t c; int brk; ZSTTY_LOCK(sc); ZS_WRITE(sc, sc->sc_csr, ZSWR0_CLR_INTR); brk = 0; needsoft = 0; if ((rr3 & ZSRR3_IP_B_RX) != 0) { needsoft = 1; do { /* * First read the status, because reading the received * char destroys the status of this char. */ rr1 = ZS_READ_REG(sc, 1); c = ZS_READ(sc, sc->sc_data); if ((rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) != 0) ZS_WRITE(sc, sc->sc_csr, ZSWR0_RESET_ERRORS); #if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER) if (sc->sc_console != 0) brk = db_alt_break(c, &sc->sc_alt_break_state); #endif *sc->sc_iput++ = c; *sc->sc_iput++ = rr1; if (sc->sc_iput == sc->sc_ibuf + sizeof(sc->sc_ibuf)) sc->sc_iput = sc->sc_ibuf; } while ((ZS_READ(sc, sc->sc_csr) & ZSRR0_RX_READY) != 0); } if ((rr3 & ZSRR3_IP_B_STAT) != 0) { rr0 = ZS_READ(sc, sc->sc_csr); ZS_WRITE(sc, sc->sc_csr, ZSWR0_RESET_STATUS); #if defined(DDB) && defined(BREAK_TO_DEBUGGER) if (sc->sc_console != 0 && (rr0 & ZSRR0_BREAK) != 0) brk = 1; #endif /* XXX do something about flow control */ } if ((rr3 & ZSRR3_IP_B_TX) != 0) { /* * If we've delayed a paramter change, do it now. */ if (sc->sc_preg_held) { sc->sc_preg_held = 0; zstty_load_regs(sc); } if (sc->sc_ocnt > 0) { ZS_WRITE(sc, sc->sc_data, *sc->sc_oget++); sc->sc_ocnt--; } else { /* * Disable transmit completion interrupts if * necessary. */ if ((sc->sc_preg[1] & ZSWR1_TIE) != 0) { sc->sc_preg[1] &= ~ZSWR1_TIE; sc->sc_creg[1] = sc->sc_preg[1]; ZS_WRITE_REG(sc, 1, sc->sc_creg[1]); } sc->sc_tx_done = 1; sc->sc_tx_busy = 0; needsoft = 1; } } ZSTTY_UNLOCK(sc); if (brk != 0) breakpoint(); return (needsoft); } static void zstty_softintr(struct zstty_softc *sc) { struct tty *tp = sc->sc_tty; int data; int stat; if ((tp->t_state & TS_ISOPEN) == 0) return; while (sc->sc_iget != sc->sc_iput) { data = *sc->sc_iget++; stat = *sc->sc_iget++; if ((stat & ZSRR1_PE) != 0) data |= TTY_PE; if ((stat & ZSRR1_FE) != 0) data |= TTY_FE; if (sc->sc_iget == sc->sc_ibuf + sizeof(sc->sc_ibuf)) sc->sc_iget = sc->sc_ibuf; ttyld_rint(tp, data); } if (sc->sc_tx_done != 0) { sc->sc_tx_done = 0; tp->t_state &= ~TS_BUSY; ttyld_start(tp); } } static int zsttyopen(dev_t dev, int flags, int mode, struct thread *td) { struct zstty_softc *sc; struct tty *tp; int error; sc = dev->si_drv1; tp = dev->si_tty; if ((tp->t_state & TS_ISOPEN) != 0 && (tp->t_state & TS_XCLUDE) != 0 && suser(td) != 0) return (EBUSY); if ((tp->t_state & TS_ISOPEN) == 0) { struct termios t; /* * Enable receive and status interrupts in zstty_param. */ sc->sc_preg[1] |= ZSWR1_RIE | ZSWR1_SIE; sc->sc_iput = sc->sc_iget = sc->sc_ibuf; /* * Initialize the termios status to the defaults. Add in the * sticky bits from TIOCSFLAGS. */ t.c_ispeed = 0; t.c_ospeed = tp->t_ospeed; t.c_cflag = TTYDEF_CFLAG; /* Make sure zstty_param() will do something. */ tp->t_ospeed = 0; (void)zstty_param(sc, tp, &t); tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_lflag = TTYDEF_LFLAG; ttychars(tp); ttsetwater(tp); /* XXX turn on DTR */ /* XXX handle initial DCD */ } error = ttyopen(dev, tp); if (error != 0) return (error); error = ttyld_open(tp, dev); if (error != 0) return (error); return (0); } static int zsttyclose(dev_t dev, int flags, int mode, struct thread *td) { struct tty *tp; tp = dev->si_tty; if ((tp->t_state & TS_ISOPEN) == 0) return (0); ttyld_close(tp, flags); ttyclose(tp); return (0); } static int zsttyioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) { struct zstty_softc *sc; struct tty *tp; int error; sc = dev->si_drv1; tp = dev->si_tty; error = ttyioctl(dev, cmd, data, flags, td); if (error != ENOTTY) return (error); error = 0; switch (cmd) { case TIOCSBRK: ZS_WRITE_REG(sc, 5, ZS_READ_REG(sc, 5) | ZSWR5_BREAK); break; case TIOCCBRK: ZS_WRITE_REG(sc, 5, ZS_READ_REG(sc, 5) & ~ZSWR5_BREAK); break; case TIOCSDTR: zstty_mdmctrl(sc, TIOCM_DTR, DMBIS); break; case TIOCCDTR: zstty_mdmctrl(sc, TIOCM_DTR, DMBIC); break; case TIOCMBIS: zstty_mdmctrl(sc, *((int *)data), DMBIS); break; case TIOCMBIC: zstty_mdmctrl(sc, *((int *)data), DMBIC); break; case TIOCMGET: *((int *)data) = zstty_mdmctrl(sc, 0, DMGET); break; case TIOCMSET: zstty_mdmctrl(sc, *((int *)data), DMSET); break; default: error = ENOTTY; break; } return (error); } static void zsttystart(struct tty *tp) { struct zstty_softc *sc; uint8_t c; sc = tp->t_dev->si_drv1; if ((tp->t_state & TS_TBLOCK) != 0) /* XXX clear RTS */; else /* XXX set RTS */; if ((tp->t_state & (TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) != 0) { ttwwakeup(tp); return; } if (tp->t_outq.c_cc <= tp->t_olowat) { if ((tp->t_state & TS_SO_OLOWAT) != 0) { tp->t_state &= ~TS_SO_OLOWAT; wakeup(TSA_OLOWAT(tp)); } selwakeuppri(&tp->t_wsel, TTOPRI); if (tp->t_outq.c_cc == 0) { if ((tp->t_state & (TS_BUSY | TS_SO_OCOMPLETE)) == TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { tp->t_state &= ~TS_SO_OCOMPLETE; wakeup(TSA_OCOMPLETE(tp)); } return; } } sc->sc_ocnt = q_to_b(&tp->t_outq, sc->sc_obuf, sizeof(sc->sc_obuf)); if (sc->sc_ocnt == 0) return; c = sc->sc_obuf[0]; sc->sc_oget = sc->sc_obuf + 1; sc->sc_ocnt--; tp->t_state |= TS_BUSY; sc->sc_tx_busy = 1; /* * Enable transmit interrupts if necessary and send the first * character to start up the transmitter. */ if ((sc->sc_preg[1] & ZSWR1_TIE) == 0) { sc->sc_preg[1] |= ZSWR1_TIE; sc->sc_creg[1] = sc->sc_preg[1]; ZS_WRITE_REG(sc, 1, sc->sc_creg[1]); } ZS_WRITE(sc, sc->sc_data, c); ttwwakeup(tp); } static void zsttystop(struct tty *tp, int flag) { struct zstty_softc *sc; sc = tp->t_dev->si_drv1; if ((flag & FREAD) != 0) { /* XXX stop reading, anything to do? */; } if ((flag & FWRITE) != 0) { if ((tp->t_state & TS_BUSY) != 0) { /* XXX do what? */ if ((tp->t_state & TS_TTSTOP) == 0) tp->t_state |= TS_FLUSH; } } } static int zsttyparam(struct tty *tp, struct termios *t) { struct zstty_softc *sc; sc = tp->t_dev->si_drv1; return (zstty_param(sc, tp, t)); } static int zstty_mdmctrl(struct zstty_softc *sc, int bits, int how) { /* XXX implement! */ return (0); } static int zstty_param(struct zstty_softc *sc, struct tty *tp, struct termios *t) { tcflag_t cflag; uint8_t wr3; uint8_t wr4; uint8_t wr5; int ospeed; ospeed = zstty_speed(sc, t->c_ospeed); if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed)) return (EINVAL); /* * If there were no changes, don't do anything. This avoids dropping * input and improves performance when all we did was frob things like * VMIN and VTIME. */ if (tp->t_ospeed == t->c_ospeed && tp->t_cflag == t->c_cflag) return (0); zstty_mdmctrl(sc, TIOCM_DTR, (t->c_ospeed == 0) ? DMBIC : DMBIS); cflag = t->c_cflag; if (sc->sc_console != 0) { cflag |= CLOCAL; cflag &= ~HUPCL; } wr3 = ZSWR3_RX_ENABLE; wr5 = ZSWR5_TX_ENABLE | ZSWR5_DTR | ZSWR5_RTS; switch (cflag & CSIZE) { case CS5: wr3 |= ZSWR3_RX_5; wr5 |= ZSWR5_TX_5; break; case CS6: wr3 |= ZSWR3_RX_6; wr5 |= ZSWR5_TX_6; break; case CS7: wr3 |= ZSWR3_RX_7; wr5 |= ZSWR5_TX_7; break; case CS8: default: wr3 |= ZSWR3_RX_8; wr5 |= ZSWR5_TX_8; break; } wr4 = ZSWR4_CLK_X16 | (cflag & CSTOPB ? ZSWR4_TWOSB : ZSWR4_ONESB); if ((cflag & PARODD) == 0) wr4 |= ZSWR4_EVENP; if (cflag & PARENB) wr4 |= ZSWR4_PARENB; tp->t_ispeed = 0; tp->t_ospeed = t->c_ospeed; tp->t_cflag = cflag; ttsetwater(tp); ZSTTY_LOCK(sc); sc->sc_preg[3] = wr3; sc->sc_preg[4] = wr4; sc->sc_preg[5] = wr5; zstty_set_speed(sc, ospeed); if (cflag & CRTSCTS) sc->sc_preg[15] |= ZSWR15_CTS_IE; else sc->sc_preg[15] &= ~ZSWR15_CTS_IE; zstty_load_regs(sc); ZSTTY_UNLOCK(sc); return (0); } static void zstty_flush(struct zstty_softc *sc) { uint8_t rr0; uint8_t rr1; uint8_t c; for (;;) { rr0 = ZS_READ(sc, sc->sc_csr); if ((rr0 & ZSRR0_RX_READY) == 0) break; rr1 = ZS_READ_REG(sc, 1); c = ZS_READ(sc, sc->sc_data); if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) ZS_WRITE(sc, sc->sc_data, ZSWR0_RESET_ERRORS); } } static void zstty_load_regs(struct zstty_softc *sc) { /* * If the transmitter may be active, just hold the change and do it * in the tx interrupt handler. Changing the registers while tx is * active may hang the chip. */ if (sc->sc_tx_busy != 0) { sc->sc_preg_held = 1; return; } /* If the regs are the same do nothing. */ if (bcmp(sc->sc_preg, sc->sc_creg, 16) == 0) return; bcopy(sc->sc_preg, sc->sc_creg, 16); /* XXX: reset error condition */ ZS_WRITE(sc, sc->sc_csr, ZSM_RESET_ERR); /* disable interrupts */ ZS_WRITE_REG(sc, 1, sc->sc_creg[1] & ~ZSWR1_IMASK); /* baud clock divisor, stop bits, parity */ ZS_WRITE_REG(sc, 4, sc->sc_creg[4]); /* misc. TX/RX control bits */ ZS_WRITE_REG(sc, 10, sc->sc_creg[10]); /* char size, enable (RX/TX) */ ZS_WRITE_REG(sc, 3, sc->sc_creg[3] & ~ZSWR3_RX_ENABLE); ZS_WRITE_REG(sc, 5, sc->sc_creg[5] & ~ZSWR5_TX_ENABLE); /* Shut down the BRG */ ZS_WRITE_REG(sc, 14, sc->sc_creg[14] & ~ZSWR14_BAUD_ENA); /* clock mode control */ ZS_WRITE_REG(sc, 11, sc->sc_creg[11]); /* baud rate (lo/hi) */ ZS_WRITE_REG(sc, 12, sc->sc_creg[12]); ZS_WRITE_REG(sc, 13, sc->sc_creg[13]); /* Misc. control bits */ ZS_WRITE_REG(sc, 14, sc->sc_creg[14]); /* which lines cause status interrupts */ ZS_WRITE_REG(sc, 15, sc->sc_creg[15]); /* * Zilog docs recommend resetting external status twice at this * point. Mainly as the status bits are latched, and the first * interrupt clear might unlatch them to new values, generating * a second interrupt request. */ ZS_WRITE(sc, sc->sc_csr, ZSM_RESET_STINT); ZS_WRITE(sc, sc->sc_csr, ZSM_RESET_STINT); /* char size, enable (RX/TX)*/ ZS_WRITE_REG(sc, 3, sc->sc_creg[3]); ZS_WRITE_REG(sc, 5, sc->sc_creg[5]); /* interrupt enables: RX, TX, STATUS */ ZS_WRITE_REG(sc, 1, sc->sc_creg[1]); } static int zstty_speed(struct zstty_softc *sc, int rate) { int tconst; if (rate == 0) return (0); tconst = BPS_TO_TCONST(sc->sc_brg_clk, rate); if (tconst < 0 || TCONST_TO_BPS(sc->sc_brg_clk, tconst) != rate) return (-1); return (tconst); } static void zs_cnprobe(struct consdev *cn) { struct zstty_softc *sc = zstty_cons; if (sc == NULL) cn->cn_pri = CN_DEAD; else { cn->cn_pri = CN_REMOTE; strcpy(cn->cn_name, devtoname(sc->sc_si)); cn->cn_tp = sc->sc_tty; } } static void zs_cninit(struct consdev *cn) { } static void zs_cnterm(struct consdev *cn) { } static int zs_cngetc(struct consdev *cn) { struct zstty_softc *sc = zstty_cons; if (sc == NULL) return (-1); return (zstty_cngetc(sc)); } static int zs_cncheckc(struct consdev *cn) { struct zstty_softc *sc = zstty_cons; if (sc == NULL) return (-1); return (zstty_cncheckc(sc)); } static void zs_cnputc(struct consdev *cn, int c) { struct zstty_softc *sc = zstty_cons; if (sc == NULL) return; zstty_cnputc(sc, c); } static void zs_cndbctl(struct consdev *cn, int c) { } static void zstty_cnopen(struct zstty_softc *sc) { } static void zstty_cnclose(struct zstty_softc *sc) { } static int zstty_cngetc(struct zstty_softc *sc) { uint8_t c; zstty_cnopen(sc); while ((ZS_READ(sc, sc->sc_csr) & ZSRR0_RX_READY) == 0) ; c = ZS_READ(sc, sc->sc_data); zstty_cnclose(sc); return (c); } static int zstty_cncheckc(struct zstty_softc *sc) { int c; c = -1; zstty_cnopen(sc); if ((ZS_READ(sc, sc->sc_csr) & ZSRR0_RX_READY) != 0) c = ZS_READ(sc, sc->sc_data); zstty_cnclose(sc); return (c); } static void zstty_cnputc(struct zstty_softc *sc, int c) { zstty_cnopen(sc); while ((ZS_READ(sc, sc->sc_csr) & ZSRR0_TX_READY) == 0) ; ZS_WRITE(sc, sc->sc_data, c); zstty_cnclose(sc); }