/* $NetBSD: epcom.c,v 1.29.2.1 2015/06/06 14:39:55 skrll Exp $ */ /* * Copyright (c) 1998, 1999, 2001, 2002, 2004 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jesse Off * * This code is derived from software contributed to The NetBSD Foundation * by Ichiro FUKUHARA and Naoto Shimazaki. * * This code is derived from software contributed to The NetBSD Foundation * by IWAMOTO Toshihiro. * * 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 */ /* * TODO: hardware flow control */ #include __KERNEL_RCSID(0, "$NetBSD: epcom.c,v 1.29.2.1 2015/06/06 14:39:55 skrll Exp $"); #include "opt_ddb.h" #include "opt_kgdb.h" #include "epcom.h" #ifdef RND_COM #include #endif /* * Override cnmagic(9) macro before including . * We need to know if cn_check_magic triggered debugger, so set a flag. * Callers of cn_check_magic must declare int cn_trapped = 0; * XXX: this is *ugly*! */ #define cn_trap() \ do { \ console_debugger(); \ cn_trapped = 1; \ } while (/* CONSTCOND */ 0) #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int epcomparam(struct tty *, struct termios *); static void epcomstart(struct tty *); static int epcomhwiflow(struct tty *, int); static u_int cflag2lcrhi(tcflag_t); static void epcom_iflush(struct epcom_softc *); static void epcom_set(struct epcom_softc *); int epcomcngetc(dev_t); void epcomcnputc(dev_t, int); void epcomcnpollc(dev_t, int); static void epcomsoft(void* arg); inline static void epcom_txsoft(struct epcom_softc *, struct tty *); inline static void epcom_rxsoft(struct epcom_softc *, struct tty *); void epcomcnprobe(struct consdev *); void epcomcninit(struct consdev *); static struct epcom_cons_softc { bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; bus_addr_t sc_hwbase; int sc_ospeed; tcflag_t sc_cflag; int sc_attached; } epcomcn_sc; static struct cnm_state epcom_cnm_state; extern struct cfdriver epcom_cd; dev_type_open(epcomopen); dev_type_close(epcomclose); dev_type_read(epcomread); dev_type_write(epcomwrite); dev_type_ioctl(epcomioctl); dev_type_stop(epcomstop); dev_type_tty(epcomtty); dev_type_poll(epcompoll); const struct cdevsw epcom_cdevsw = { .d_open = epcomopen, .d_close = epcomclose, .d_read = epcomread, .d_write = epcomwrite, .d_ioctl = epcomioctl, .d_stop = epcomstop, .d_tty = epcomtty, .d_poll = epcompoll, .d_mmap = nommap, .d_kqfilter = ttykqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; struct consdev epcomcons = { NULL, NULL, epcomcngetc, epcomcnputc, epcomcnpollc, NULL, NULL, NULL, NODEV, CN_NORMAL }; #ifndef DEFAULT_COMSPEED #define DEFAULT_COMSPEED 115200 #endif #define COMUNIT(x) TTUNIT(x) #define COMDIALOUT(x) TTDIALOUT(x) #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \ device_is_active((sc)->sc_dev)) void epcom_attach_subr(struct epcom_softc *sc) { struct tty *tp; if (sc->sc_iot == epcomcn_sc.sc_iot && sc->sc_hwbase == epcomcn_sc.sc_hwbase) { epcomcn_sc.sc_attached = 1; sc->sc_lcrlo = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) & 0xff; sc->sc_lcrmid = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) >> 8; /* Make sure the console is always "hardwired". */ delay(10000); /* wait for output to finish */ SET(sc->sc_hwflags, COM_HW_CONSOLE); SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); } tp = tty_alloc(); tp->t_oproc = epcomstart; tp->t_param = epcomparam; tp->t_hwiflow = epcomhwiflow; sc->sc_tty = tp; sc->sc_rbuf = malloc(EPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT); sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; sc->sc_rbavail = EPCOM_RING_SIZE; if (sc->sc_rbuf == NULL) { printf("%s: unable to allocate ring buffer\n", device_xname(sc->sc_dev)); return; } sc->sc_ebuf = sc->sc_rbuf + (EPCOM_RING_SIZE << 1); sc->sc_tbc = 0; sc->sc_lcrlo = EPCOMSPEED2BRD(DEFAULT_COMSPEED) & 0xff; sc->sc_lcrmid = EPCOMSPEED2BRD(DEFAULT_COMSPEED) >> 8; sc->sc_lcrhi = cflag2lcrhi(CS8); /* 8N1 */ tty_attach(tp); if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { int maj; /* locate the major number */ maj = cdevsw_lookup_major(&epcom_cdevsw); cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev)); aprint_normal("%s: console\n", device_xname(sc->sc_dev)); } sc->sc_si = softint_establish(SOFTINT_SERIAL, epcomsoft, sc); #ifdef RND_COM rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), RND_TYPE_TTY, RND_FLAG_DEFAULT); #endif /* if there are no enable/disable functions, assume the device is always enabled */ if (!sc->enable) sc->enabled = 1; /* XXX configure register */ /* xxx_config(sc) */ SET(sc->sc_hwflags, COM_HW_DEV_OK); } static int epcomparam(struct tty *tp, struct termios *t) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(tp->t_dev)); int s; if (COM_ISALIVE(sc) == 0) return (EIO); if (t->c_ispeed && t->c_ispeed != t->c_ospeed) return (EINVAL); /* * For the console, always force CLOCAL and !HUPCL, so that the port * is always active. */ if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { SET(t->c_cflag, CLOCAL); CLR(t->c_cflag, HUPCL); } /* * 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); s = splserial(); sc->sc_lcrhi = cflag2lcrhi(t->c_cflag); sc->sc_lcrlo = EPCOMSPEED2BRD(t->c_ospeed) & 0xff; sc->sc_lcrmid = EPCOMSPEED2BRD(t->c_ospeed) >> 8; /* And copy to tty. */ tp->t_ispeed = 0; tp->t_ospeed = t->c_ospeed; tp->t_cflag = t->c_cflag; epcom_set(sc); splx(s); /* * Update the tty layer's idea of the carrier bit. * We tell tty the carrier is always on. */ (void) (*tp->t_linesw->l_modem)(tp, 1); #ifdef COM_DEBUG if (com_debug) comstatus(sc, "comparam "); #endif if (!ISSET(t->c_cflag, CHWFLOW)) { if (sc->sc_tx_stopped) { sc->sc_tx_stopped = 0; epcomstart(tp); } } return (0); } static int epcomhwiflow(struct tty *tp, int block) { return (0); } static void epcom_filltx(struct epcom_softc *sc) { bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; int n; n = 0; while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) == 0) { if (n >= sc->sc_tbc) break; bus_space_write_4(iot, ioh, EPCOM_Data, 0xff & *(sc->sc_tba + n)); n++; } sc->sc_tbc -= n; sc->sc_tba += n; } static void epcomstart(struct tty *tp) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(tp->t_dev)); int s; if (COM_ISALIVE(sc) == 0) return; s = spltty(); if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) goto out; if (sc->sc_tx_stopped) goto out; if (!ttypull(tp)) goto out; /* Grab the first contiguous region of buffer space. */ { u_char *tba; int tbc; tba = tp->t_outq.c_cf; tbc = ndqb(&tp->t_outq, 0); (void)splserial(); sc->sc_tba = tba; sc->sc_tbc = tbc; } SET(tp->t_state, TS_BUSY); sc->sc_tx_busy = 1; /* Output the first chunk of the contiguous buffer. */ epcom_filltx(sc); if (!ISSET(sc->sc_ctrl, Ctrl_TIE)) { SET(sc->sc_ctrl, Ctrl_TIE); epcom_set(sc); } out: splx(s); return; } static void epcom_break(struct epcom_softc *sc, int onoff) { if (onoff) SET(sc->sc_lcrhi, LinCtrlHigh_BRK); else CLR(sc->sc_lcrhi, LinCtrlHigh_BRK); epcom_set(sc); } static void epcom_shutdown(struct epcom_softc *sc) { int s; s = splserial(); /* Turn off interrupts. */ CLR(sc->sc_ctrl, (Ctrl_TIE|Ctrl_RTIE|Ctrl_RIE)); /* Clear any break condition set with TIOCSBRK. */ epcom_break(sc, 0); epcom_set(sc); if (sc->disable) { #ifdef DIAGNOSTIC if (!sc->enabled) panic("epcom_shutdown: not enabled?"); #endif (*sc->disable)(sc); sc->enabled = 0; } splx(s); } int epcomopen(dev_t dev, int flag, int mode, struct lwp *l) { struct epcom_softc *sc; struct tty *tp; int s, s2; int error; sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) || sc->sc_rbuf == NULL) return (ENXIO); if (!device_is_active(sc->sc_dev)) return (ENXIO); #ifdef KGDB /* * If this is the kgdb port, no other use is permitted. */ if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) return (EBUSY); #endif tp = sc->sc_tty; if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) return (EBUSY); s = spltty(); /* * Do the following iff this is a first open. */ if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { struct termios t; tp->t_dev = dev; s2 = splserial(); if (sc->enable) { if ((*sc->enable)(sc)) { splx(s2); splx(s); printf("%s: device enable failed\n", device_xname(sc->sc_dev)); return (EIO); } sc->enabled = 1; #if 0 /* XXXXXXXXXXXXXXX */ com_config(sc); #endif } /* Turn on interrupts. */ SET(sc->sc_ctrl, (Ctrl_UARTE|Ctrl_RIE|Ctrl_RTIE)); epcom_set(sc); #if 0 /* Fetch the current modem control status, needed later. */ sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); /* Clear PPS capture state on first open. */ sc->sc_ppsmask = 0; sc->ppsparam.mode = 0; #endif splx(s2); /* * Initialize the termios status to the defaults. Add in the * sticky bits from TIOCSFLAGS. */ t.c_ispeed = 0; if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { t.c_ospeed = epcomcn_sc.sc_ospeed; t.c_cflag = epcomcn_sc.sc_cflag; } else { t.c_ospeed = TTYDEF_SPEED; t.c_cflag = TTYDEF_CFLAG; } if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) SET(t.c_cflag, CLOCAL); if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) SET(t.c_cflag, CRTSCTS); if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) SET(t.c_cflag, MDMBUF); /* Make sure epcomparam() will do something. */ tp->t_ospeed = 0; (void) epcomparam(tp, &t); tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_lflag = TTYDEF_LFLAG; ttychars(tp); ttsetwater(tp); s2 = splserial(); /* Clear the input ring, and unblock. */ sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; sc->sc_rbavail = EPCOM_RING_SIZE; epcom_iflush(sc); CLR(sc->sc_rx_flags, RX_ANY_BLOCK); #ifdef COM_DEBUG if (epcom_debug) comstatus(sc, "epcomopen "); #endif splx(s2); } splx(s); error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); if (error) goto bad; error = (*tp->t_linesw->l_open)(dev, tp); if (error) goto bad; return (0); bad: if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { /* * We failed to open the device, and nobody else had it opened. * Clean up the state as appropriate. */ epcom_shutdown(sc); } return (error); } int epcomclose(dev_t dev, int flag, int mode, struct lwp *l) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); struct tty *tp = sc->sc_tty; /* XXX This is for cons.c. */ if (!ISSET(tp->t_state, TS_ISOPEN)) return (0); (*tp->t_linesw->l_close)(tp, flag); ttyclose(tp); if (COM_ISALIVE(sc) == 0) return (0); if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { /* * Although we got a last close, the device may still be in * use; e.g. if this was the dialout node, and there are still * processes waiting for carrier on the non-dialout node. */ epcom_shutdown(sc); } return (0); } int epcomread(dev_t dev, struct uio *uio, int flag) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); struct tty *tp = sc->sc_tty; if (COM_ISALIVE(sc) == 0) return (EIO); return ((*tp->t_linesw->l_read)(tp, uio, flag)); } int epcomwrite(dev_t dev, struct uio *uio, int flag) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); struct tty *tp = sc->sc_tty; if (COM_ISALIVE(sc) == 0) return (EIO); return ((*tp->t_linesw->l_write)(tp, uio, flag)); } int epcompoll(dev_t dev, int events, struct lwp *l) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); struct tty *tp = sc->sc_tty; if (COM_ISALIVE(sc) == 0) return (EIO); return ((*tp->t_linesw->l_poll)(tp, events, l)); } struct tty * epcomtty(dev_t dev) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); struct tty *tp = sc->sc_tty; return (tp); } int epcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev)); struct tty *tp = sc->sc_tty; int error; int s; if (COM_ISALIVE(sc) == 0) return (EIO); 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); error = 0; s = splserial(); switch (cmd) { case TIOCSBRK: epcom_break(sc, 1); break; case TIOCCBRK: epcom_break(sc, 0); break; case TIOCGFLAGS: *(int *)data = sc->sc_swflags; break; case TIOCSFLAGS: error = kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_PRIVSET, tp); if (error) break; sc->sc_swflags = *(int *)data; break; default: error = EPASSTHROUGH; break; } splx(s); return (error); } /* * Stop output on a line. */ void epcomstop(struct tty *tp, int flag) { struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(tp->t_dev)); int s; s = splserial(); if (ISSET(tp->t_state, TS_BUSY)) { /* Stop transmitting at the next chunk. */ sc->sc_tbc = 0; if (!ISSET(tp->t_state, TS_TTSTOP)) SET(tp->t_state, TS_FLUSH); } splx(s); } static u_int cflag2lcrhi(tcflag_t cflag) { u_int lcrhi; switch (cflag & CSIZE) { case CS7: lcrhi = 0x40; break; case CS6: lcrhi = 0x20; break; case CS8: default: lcrhi = 0x60; break; } lcrhi |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0; lcrhi |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS; lcrhi |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0; lcrhi |= LinCtrlHigh_FEN; /* FIFO always enabled */ return (lcrhi); } static void epcom_iflush(struct epcom_softc *sc) { bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; #ifdef DIAGNOSTIC int reg; #endif int timo; #ifdef DIAGNOSTIC reg = 0xffff; #endif timo = 50000; /* flush any pending I/O */ while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) == 0 && --timo) #ifdef DIAGNOSTIC reg = #else (void) #endif bus_space_read_4(iot, ioh, EPCOM_Data); #ifdef DIAGNOSTIC if (!timo) printf("%s: com_iflush timeout %02x\n", device_xname(sc->sc_dev), reg); #endif } static void epcom_set(struct epcom_softc *sc) { bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlLow, sc->sc_lcrlo); bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlMid, sc->sc_lcrmid); bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlHigh, sc->sc_lcrhi); bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_Ctrl, sc->sc_ctrl); } int epcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh, int ospeed, tcflag_t cflag) { u_int lcrlo, lcrmid, lcrhi, ctrl, pwrcnt; bus_space_handle_t syscon_ioh; cn_tab = &epcomcons; cn_init_magic(&epcom_cnm_state); cn_set_magic("\047\001"); epcomcn_sc.sc_iot = iot; epcomcn_sc.sc_ioh = ioh; epcomcn_sc.sc_hwbase = iobase; epcomcn_sc.sc_ospeed = ospeed; epcomcn_sc.sc_cflag = cflag; lcrhi = cflag2lcrhi(cflag); lcrlo = EPCOMSPEED2BRD(ospeed) & 0xff; lcrmid = EPCOMSPEED2BRD(ospeed) >> 8; ctrl = Ctrl_UARTE; bus_space_map(iot, EP93XX_APB_HWBASE + EP93XX_APB_SYSCON, EP93XX_APB_SYSCON_SIZE, 0, &syscon_ioh); pwrcnt = bus_space_read_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt); pwrcnt &= ~(PwrCnt_UARTBAUD); bus_space_write_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt, pwrcnt); bus_space_unmap(iot, syscon_ioh, EP93XX_APB_SYSCON_SIZE); bus_space_write_4(iot, ioh, EPCOM_LinCtrlLow, lcrlo); bus_space_write_4(iot, ioh, EPCOM_LinCtrlMid, lcrmid); bus_space_write_4(iot, ioh, EPCOM_LinCtrlHigh, lcrhi); bus_space_write_4(iot, ioh, EPCOM_Ctrl, ctrl); return (0); } void epcomcnprobe(struct consdev *cp) { cp->cn_pri = CN_REMOTE; } void epcomcnpollc(dev_t dev, int on) { } void epcomcnputc(dev_t dev, int c) { int s; bus_space_tag_t iot = epcomcn_sc.sc_iot; bus_space_handle_t ioh = epcomcn_sc.sc_ioh; s = splserial(); while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) != 0) ; bus_space_write_4(iot, ioh, EPCOM_Data, c); #ifdef DEBUG if (c == '\r') { while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFE) == 0) ; } #endif splx(s); } int epcomcngetc(dev_t dev) { int c, sts; int s; bus_space_tag_t iot = epcomcn_sc.sc_iot; bus_space_handle_t ioh = epcomcn_sc.sc_ioh; s = splserial(); while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) != 0) ; c = bus_space_read_4(iot, ioh, EPCOM_Data); sts = bus_space_read_4(iot, ioh, EPCOM_RXSts); if (ISSET(sts, RXSts_BE)) c = CNC_BREAK; #ifdef DDB extern int db_active; if (!db_active) #endif { int cn_trapped __unused = 0; cn_check_magic(dev, c, epcom_cnm_state); } c &= 0xff; splx(s); return (c); } inline static void epcom_txsoft(struct epcom_softc *sc, struct tty *tp) { CLR(tp->t_state, TS_BUSY); if (ISSET(tp->t_state, TS_FLUSH)) CLR(tp->t_state, TS_FLUSH); else ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); (*tp->t_linesw->l_start)(tp); } inline static void epcom_rxsoft(struct epcom_softc *sc, struct tty *tp) { int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; u_char *get, *end; u_int cc, scc; u_char sts; int code; int s; end = sc->sc_ebuf; get = sc->sc_rbget; scc = cc = EPCOM_RING_SIZE - sc->sc_rbavail; #if 0 if (cc == EPCOM_RING_SIZE) { sc->sc_floods++; if (sc->sc_errors++ == 0) callout_reset(&sc->sc_diag_callout, 60 * hz, comdiag, sc); } #endif while (cc) { code = get[0]; sts = get[1]; if (ISSET(sts, RXSts_OE | RXSts_FE | RXSts_PE | RXSts_BE)) { #if 0 if (ISSET(lsr, DR_ROR)) { sc->sc_overflows++; if (sc->sc_errors++ == 0) callout_reset(&sc->sc_diag_callout, 60 * hz, comdiag, sc); } #endif if (ISSET(sts, (RXSts_FE|RXSts_BE))) SET(code, TTY_FE); if (ISSET(sts, RXSts_PE)) SET(code, TTY_PE); } if ((*rint)(code, tp) == -1) { /* * The line discipline's buffer is out of space. */ if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { /* * We're either not using flow control, or the * line discipline didn't tell us to block for * some reason. Either way, we have no way to * know when there's more space available, so * just drop the rest of the data. */ get += cc << 1; if (get >= end) get -= EPCOM_RING_SIZE << 1; cc = 0; } else { /* * Don't schedule any more receive processing * until the line discipline tells us there's * space available (through comhwiflow()). * Leave the rest of the data in the input * buffer. */ SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); } break; } get += 2; if (get >= end) get = sc->sc_rbuf; cc--; } if (cc != scc) { sc->sc_rbget = get; s = splserial(); cc = sc->sc_rbavail += scc - cc; /* Buffers should be ok again, release possible block. */ if (cc >= 1) { if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); SET(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); epcom_set(sc); } if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); #if 0 com_hwiflow(sc); #endif } } splx(s); } } static void epcomsoft(void* arg) { struct epcom_softc *sc = arg; if (COM_ISALIVE(sc) == 0) return; if (sc->sc_rx_ready) { sc->sc_rx_ready = 0; epcom_rxsoft(sc, sc->sc_tty); } if (sc->sc_tx_done) { sc->sc_tx_done = 0; epcom_txsoft(sc, sc->sc_tty); } } int epcomintr(void* arg) { struct epcom_softc *sc = arg; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; u_char *put, *end; u_int cc; u_int flagr; uint32_t c, csts; (void) bus_space_read_4(iot, ioh, EPCOM_IntIDIntClr); if (COM_ISALIVE(sc) == 0) panic("intr on disabled epcom"); flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); end = sc->sc_ebuf; put = sc->sc_rbput; cc = sc->sc_rbavail; if (!(ISSET(flagr, Flag_RXFE))) { if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { while (cc > 0) { if (ISSET(flagr, Flag_RXFE)) break; c = bus_space_read_4(iot, ioh, EPCOM_Data); csts = bus_space_read_4(iot, ioh, EPCOM_RXSts); if (ISSET(csts, RXSts_BE)) { int cn_trapped = 0; cn_check_magic(sc->sc_tty->t_dev, CNC_BREAK, epcom_cnm_state); if (cn_trapped) goto next; #if defined(KGDB) && !defined(DDB) if (ISSET(sc->sc_hwflags, COM_HW_KGDB)){ kgdb_connect(1); goto next; } #endif } else { int cn_trapped = 0; cn_check_magic(sc->sc_tty->t_dev, (c & 0xff), epcom_cnm_state); if (cn_trapped) goto next; } put[0] = c & 0xff; put[1] = csts & 0xf; put += 2; if (put >= end) put = sc->sc_rbuf; cc--; next: flagr = bus_space_read_4(iot, ioh, EPCOM_Flag); } /* * Current string of incoming characters ended because * no more data was available or we ran out of space. * Schedule a receive event if any data was received. * If we're out of space, turn off receive interrupts. */ sc->sc_rbput = put; sc->sc_rbavail = cc; if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) sc->sc_rx_ready = 1; /* * See if we are in danger of overflowing a buffer. If * so, use hardware flow control to ease the pressure. */ /* but epcom cannot. X-( */ /* * If we're out of space, disable receive interrupts * until the queue has drained a bit. */ if (!cc) { SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); epcom_set(sc); } } else { #ifdef DIAGNOSTIC panic("epcomintr: we shouldn't reach here"); #endif CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE)); epcom_set(sc); } } /* * Done handling any receive interrupts. See if data can be * transmitted as well. Schedule tx done event if no data left * and tty was marked busy. */ if (!ISSET(flagr, Flag_TXFF) && sc->sc_tbc > 0) { /* Output the next chunk of the contiguous buffer, if any. */ epcom_filltx(sc); } else { /* Disable transmit completion interrupts if necessary. */ if (ISSET(sc->sc_ctrl, Ctrl_TIE)) { CLR(sc->sc_ctrl, Ctrl_TIE); epcom_set(sc); } if (sc->sc_tx_busy) { sc->sc_tx_busy = 0; sc->sc_tx_done = 1; } } /* Wake up the poller. */ softint_schedule(sc->sc_si); #if 0 /* XXX: broken */ #ifdef RND_COM rnd_add_uint32(&sc->rnd_source, intr ^ flagr); #endif #endif return (1); }