/* $NetBSD: sci.c,v 1.65 2023/09/17 14:22:28 andvar Exp $ */ /*- * Copyright (C) 1999 T.Horiuchi and SAITOH Masanobu. 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. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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) 1998, 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)com.c 7.5 (Berkeley) 5/16/91 */ /* * SH internal serial driver * * This code is derived from both z8530tty.c and com.c */ #include __KERNEL_RCSID(0, "$NetBSD: sci.c,v 1.65 2023/09/17 14:22:28 andvar Exp $"); #include "opt_kgdb.h" #include "opt_sci.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SCI_DEBUG int sci_debug = 1; #define DPRINTF(x) if (sci_debug) printf x #else #define DPRINTF(x) #endif static void scistart(struct tty *); static int sciparam(struct tty *, struct termios *); void scicnprobe(struct consdev *); void scicninit(struct consdev *); void scicnputc(dev_t, int); int scicngetc(dev_t); void scicnpoolc(dev_t, int); int sciintr(void *); struct sci_softc { device_t sc_dev; /* boilerplate */ struct tty *sc_tty; void *sc_si; callout_t sc_diag_ch; #if 0 bus_space_tag_t sc_iot; /* ISA i/o space identifier */ bus_space_handle_t sc_ioh; /* ISA io handle */ int sc_drq; int sc_frequency; #endif u_int sc_overflows, sc_floods, sc_errors; /* number of retries so far */ u_char sc_status[7]; /* copy of registers */ int sc_hwflags; int sc_swflags; u_int sc_fifolen; /* XXX always 0? */ u_int sc_r_hiwat, sc_r_lowat; u_char *volatile sc_rbget, *volatile sc_rbput; volatile u_int sc_rbavail; u_char *sc_rbuf, *sc_ebuf; u_char *sc_tba; /* transmit buffer address */ u_int sc_tbc, /* transmit byte count */ sc_heldtbc; volatile u_char sc_rx_flags, /* receiver blocked */ #define RX_TTY_BLOCKED 0x01 #define RX_TTY_OVERFLOWED 0x02 #define RX_IBUF_BLOCKED 0x04 #define RX_IBUF_OVERFLOWED 0x08 #define RX_ANY_BLOCK 0x0f sc_tx_busy, /* working on an output chunk */ sc_tx_done, /* done with one output chunk */ sc_tx_stopped, /* H/W level stop (lost CTS) */ sc_st_check, /* got a status interrupt */ sc_rx_ready; volatile u_char sc_heldchange; }; /* controller driver configuration */ static int sci_match(device_t, cfdata_t, void *); static void sci_attach(device_t, device_t, void *); void sci_break(struct sci_softc *, int); void sci_iflush(struct sci_softc *); #define integrate static inline void scisoft(void *); integrate void sci_rxsoft(struct sci_softc *, struct tty *); integrate void sci_txsoft(struct sci_softc *, struct tty *); integrate void sci_stsoft(struct sci_softc *, struct tty *); integrate void sci_schedrx(struct sci_softc *); void scidiag(void *); #define SCIUNIT(x) TTUNIT(x) #define SCIDIALOUT(x) TTDIALOUT(x) /* Hardware flag masks */ #define SCI_HW_NOIEN 0x01 #define SCI_HW_FIFO 0x02 #define SCI_HW_FLOW 0x08 #define SCI_HW_DEV_OK 0x20 #define SCI_HW_CONSOLE 0x40 #define SCI_HW_KGDB 0x80 /* Buffer size for character buffer */ #define SCI_RING_SIZE 2048 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ u_int sci_rbuf_hiwat = (SCI_RING_SIZE * 1) / 4; u_int sci_rbuf_lowat = (SCI_RING_SIZE * 3) / 4; #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */ int sciconscflag = CONMODE; int sciisconsole = 0; #ifdef SCICN_SPEED int scicn_speed = SCICN_SPEED; #else int scicn_speed = 9600; #endif #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ u_int sci_rbuf_size = SCI_RING_SIZE; CFATTACH_DECL_NEW(sci, sizeof(struct sci_softc), sci_match, sci_attach, NULL, NULL); extern struct cfdriver sci_cd; static int sci_attached; dev_type_open(sciopen); dev_type_close(sciclose); dev_type_read(sciread); dev_type_write(sciwrite); dev_type_ioctl(sciioctl); dev_type_stop(scistop); dev_type_tty(scitty); dev_type_poll(scipoll); const struct cdevsw sci_cdevsw = { .d_open = sciopen, .d_close = sciclose, .d_read = sciread, .d_write = sciwrite, .d_ioctl = sciioctl, .d_stop = scistop, .d_tty = scitty, .d_poll = scipoll, .d_mmap = nommap, .d_kqfilter = ttykqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; void InitializeSci (unsigned int); /* * following functions are debugging prupose only */ #define CR 0x0D #define I2C_ADRS (*(volatile unsigned int *)0xa8000000) #define USART_ON (unsigned int)~0x08 void sci_putc(unsigned char); unsigned char sci_getc(void); int SciErrCheck(void); /* * InitializeSci * : unsigned int bps; * : SCI(Serial Communication Interface) */ void InitializeSci(unsigned int bps) { /* Initialize SCR */ SHREG_SCSCR = 0x00; /* Serial Mode Register */ SHREG_SCSMR = 0x00; /* Async,8bit,NonParity,Even,1Stop,NoMulti */ /* Bit Rate Register */ SHREG_SCBRR = divrnd(sh_clock_get_pclock(), 32 * bps) - 1; /* * wait 1mSec, because Send/Recv must begin 1 bit period after * BRR is set. */ delay(1000); /* Send permission, Receive permission ON */ SHREG_SCSCR = SCSCR_TE | SCSCR_RE; /* Serial Status Register */ SHREG_SCSSR &= SCSSR_TDRE; /* Clear Status */ #if 0 I2C_ADRS &= ~0x08; /* enable RS-232C */ #endif } /* * sci_putc * : unsigned char c; */ void sci_putc(unsigned char c) { /* wait for ready */ while ((SHREG_SCSSR & SCSSR_TDRE) == 0) ; /* write send data to send register */ SHREG_SCTDR = c; /* clear ready flag */ SHREG_SCSSR &= ~SCSSR_TDRE; } /* * : SciErrCheck * 0x20 = over run * 0x10 = frame error * 0x80 = parity error */ int SciErrCheck(void) { return(SHREG_SCSSR & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)); } /* * sci_getc */ unsigned char sci_getc(void) { unsigned char c, err_c; while (((err_c = SHREG_SCSSR) & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) == 0) ; if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); return(err_c |= 0x80); } c = SHREG_SCRDR; SHREG_SCSSR &= ~SCSSR_RDRF; return(c); } static int sci_match(device_t parent, cfdata_t cf, void *aux) { if (strcmp(cf->cf_name, "sci") || sci_attached) return 0; return 1; } static void sci_attach(device_t parent, device_t self, void *aux) { struct sci_softc *sc = device_private(self); struct tty *tp; sci_attached = 1; sc->sc_dev = self; sc->sc_hwflags = 0; /* XXX */ sc->sc_swflags = 0; /* XXX */ sc->sc_fifolen = 0; /* XXX */ if (sciisconsole) { SET(sc->sc_hwflags, SCI_HW_CONSOLE); SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); printf("\n%s: console\n", device_xname(self)); } else { InitializeSci(9600); printf("\n"); } callout_init(&sc->sc_diag_ch, 0); intc_intr_establish(SH_INTEVT_SCI_ERI, IST_LEVEL, IPL_SERIAL, sciintr, sc); intc_intr_establish(SH_INTEVT_SCI_RXI, IST_LEVEL, IPL_SERIAL, sciintr, sc); intc_intr_establish(SH_INTEVT_SCI_TXI, IST_LEVEL, IPL_SERIAL, sciintr, sc); intc_intr_establish(SH_INTEVT_SCI_TEI, IST_LEVEL, IPL_SERIAL, sciintr, sc); sc->sc_si = softint_establish(SOFTINT_SERIAL, scisoft, sc); SET(sc->sc_hwflags, SCI_HW_DEV_OK); tp = tty_alloc(); tp->t_oproc = scistart; tp->t_param = sciparam; tp->t_hwiflow = NULL; sc->sc_tty = tp; sc->sc_rbuf = kmem_alloc(sci_rbuf_size << 1, KM_SLEEP); sc->sc_ebuf = sc->sc_rbuf + (sci_rbuf_size << 1); tty_attach(tp); } /* * Start or restart transmission. */ static void scistart(struct tty *tp) { struct sci_softc *sc = device_lookup_private(&sci_cd,SCIUNIT(tp->t_dev)); int s; 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; /* Enable transmit completion interrupts if necessary. */ SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; /* Output the first byte of the contiguous buffer. */ { if (sc->sc_tbc > 0) { sci_putc(*(sc->sc_tba)); sc->sc_tba++; sc->sc_tbc--; } } out: splx(s); return; } /* * Set SCI tty parameters from termios. * XXX - Should just copy the whole termios after * making sure all the changes could be done. */ static int sciparam(struct tty *tp, struct termios *t) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(tp->t_dev)); int ospeed = t->c_ospeed; int s; if (!device_is_active(sc->sc_dev)) return (EIO); /* Check requested parameters. */ if (ospeed < 0) return (EINVAL); 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, SCI_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); #if 0 /* XXX (msaitoh) */ lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); #endif s = splserial(); /* * Set the FIFO threshold based on the receive speed. * * * If it's a low speed, it's probably a mouse or some other * interactive device, so set the threshold low. * * If it's a high speed, trim the trigger level down to prevent * overflows. * * Otherwise set it a bit higher. */ #if 0 /* XXX (msaitoh) */ if (ISSET(sc->sc_hwflags, SCI_HW_HAYESP)) sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; else if (ISSET(sc->sc_hwflags, SCI_HW_FIFO)) sc->sc_fifo = FIFO_ENABLE | (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); else sc->sc_fifo = 0; #endif /* And copy to tty. */ tp->t_ispeed = 0; tp->t_ospeed = t->c_ospeed; tp->t_cflag = t->c_cflag; if (!sc->sc_heldchange) { if (sc->sc_tx_busy) { sc->sc_heldtbc = sc->sc_tbc; sc->sc_tbc = 0; sc->sc_heldchange = 1; } #if 0 /* XXX (msaitoh) */ else sci_loadchannelregs(sc); #endif } if (!ISSET(t->c_cflag, CHWFLOW)) { /* Disable the high water mark. */ sc->sc_r_hiwat = 0; sc->sc_r_lowat = 0; if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); sci_schedrx(sc); } } else { sc->sc_r_hiwat = sci_rbuf_hiwat; sc->sc_r_lowat = sci_rbuf_lowat; } splx(s); DPRINTF(("%s: sciparam\n", device_xname(sc->sc_dev))); if (!ISSET(t->c_cflag, CHWFLOW)) { if (sc->sc_tx_stopped) { sc->sc_tx_stopped = 0; scistart(tp); } } return (0); } void sci_iflush(struct sci_softc *sc) { unsigned char err_c; if (((err_c = SHREG_SCSSR) & (SCSSR_RDRF | SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { if ((err_c & (SCSSR_ORER | SCSSR_FER | SCSSR_PER)) != 0) { SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER); return; } (void)SHREG_SCRDR; SHREG_SCSSR &= ~SCSSR_RDRF; } } int sciopen(dev_t dev, int flag, int mode, struct lwp *l) { struct sci_softc *sc; struct tty *tp; int s, s2; int error; sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); if (sc == 0 || !ISSET(sc->sc_hwflags, SCI_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, SCI_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(); /* Turn on interrupts. */ SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; 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, SCI_HW_CONSOLE)) { t.c_ospeed = scicn_speed; t.c_cflag = sciconscflag; } 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 sciparam() will do something. */ tp->t_ospeed = 0; (void) sciparam(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 = sci_rbuf_size; sci_iflush(sc); CLR(sc->sc_rx_flags, RX_ANY_BLOCK); #if 0 /* XXX (msaitoh) */ sci_hwiflow(sc); #endif DPRINTF(("%s: sciopen\n", device_xname(sc->sc_dev))); splx(s2); } splx(s); error = ttyopen(tp, SCIDIALOUT(dev), ISSET(flag, O_NONBLOCK)); if (error) goto bad; error = (*tp->t_linesw->l_open)(dev, tp); if (error) goto bad; return (0); bad: return (error); } int sciclose(dev_t dev, int flag, int mode, struct lwp *l) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(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 (!device_is_active(sc->sc_dev)) return (0); return (0); } int sciread(dev_t dev, struct uio *uio, int flag) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); struct tty *tp = sc->sc_tty; return ((*tp->t_linesw->l_read)(tp, uio, flag)); } int sciwrite(dev_t dev, struct uio *uio, int flag) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); struct tty *tp = sc->sc_tty; return ((*tp->t_linesw->l_write)(tp, uio, flag)); } int scipoll(dev_t dev, int events, struct lwp *l) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); struct tty *tp = sc->sc_tty; return ((*tp->t_linesw->l_poll)(tp, events, l)); } struct tty * scitty(dev_t dev) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); struct tty *tp = sc->sc_tty; return (tp); } int sciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(dev)); struct tty *tp = sc->sc_tty; int error; int s; if (!device_is_active(sc->sc_dev)) 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: sci_break(sc, 1); break; case TIOCCBRK: sci_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); } integrate void sci_schedrx(struct sci_softc *sc) { sc->sc_rx_ready = 1; /* Wake up the poller. */ softint_schedule(sc->sc_si); } void sci_break(struct sci_softc *sc, int onoff) { if (onoff) SHREG_SCSSR &= ~SCSSR_TDRE; else SHREG_SCSSR |= SCSSR_TDRE; #if 0 /* XXX */ if (!sc->sc_heldchange) { if (sc->sc_tx_busy) { sc->sc_heldtbc = sc->sc_tbc; sc->sc_tbc = 0; sc->sc_heldchange = 1; } else sci_loadchannelregs(sc); } #endif } /* * Stop output, e.g., for ^S or output flush. */ void scistop(struct tty *tp, int flag) { struct sci_softc *sc = device_lookup_private(&sci_cd, SCIUNIT(tp->t_dev)); int s; s = splserial(); if (ISSET(tp->t_state, TS_BUSY)) { /* Stop transmitting at the next chunk. */ sc->sc_tbc = 0; sc->sc_heldtbc = 0; if (!ISSET(tp->t_state, TS_TTSTOP)) SET(tp->t_state, TS_FLUSH); } splx(s); } void scidiag(void *arg) { struct sci_softc *sc = arg; int overflows, floods; int s; s = splserial(); overflows = sc->sc_overflows; sc->sc_overflows = 0; floods = sc->sc_floods; sc->sc_floods = 0; sc->sc_errors = 0; splx(s); log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", device_xname(sc->sc_dev), overflows, overflows == 1 ? "" : "s", floods, floods == 1 ? "" : "s"); } integrate void sci_rxsoft(struct sci_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 ssr; int code; int s; end = sc->sc_ebuf; get = sc->sc_rbget; scc = cc = sci_rbuf_size - sc->sc_rbavail; if (cc == sci_rbuf_size) { sc->sc_floods++; if (sc->sc_errors++ == 0) callout_reset(&sc->sc_diag_ch, 60 * hz, scidiag, sc); } while (cc) { code = get[0]; ssr = get[1]; if (ISSET(ssr, SCSSR_FER | SCSSR_PER)) { if (ISSET(ssr, SCSSR_FER)) SET(code, TTY_FE); if (ISSET(ssr, SCSSR_PER)) 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 -= sci_rbuf_size << 1; cc = 0; } else { /* * Don't schedule any more receive processing * until the line discipline tells us there's * space available (through scihwiflow()). * 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 >= sc->sc_r_lowat) { if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); SHREG_SCSCR |= SCSCR_RIE; } #if 0 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); sci_hwiflow(sc); } #endif } splx(s); } } integrate void sci_txsoft(struct sci_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); } integrate void sci_stsoft(struct sci_softc *sc, struct tty *tp) { #if 0 /* XXX (msaitoh) */ u_char msr, delta; int s; s = splserial(); msr = sc->sc_msr; delta = sc->sc_msr_delta; sc->sc_msr_delta = 0; splx(s); if (ISSET(delta, sc->sc_msr_dcd)) { /* * Inform the tty layer that carrier detect changed. */ (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); } if (ISSET(delta, sc->sc_msr_cts)) { /* Block or unblock output according to flow control. */ if (ISSET(msr, sc->sc_msr_cts)) { sc->sc_tx_stopped = 0; (*tp->t_linesw->l_start)(tp); } else { sc->sc_tx_stopped = 1; } } DPRINTF(("%s: sci_stsoft\n", device_xname(sc->sc_dev))); #endif } void scisoft(void *arg) { struct sci_softc *sc = arg; struct tty *tp; if (!device_is_active(sc->sc_dev)) return; tp = sc->sc_tty; if (sc->sc_rx_ready) { sc->sc_rx_ready = 0; sci_rxsoft(sc, tp); } #if 0 if (sc->sc_st_check) { sc->sc_st_check = 0; sci_stsoft(sc, tp); } #endif if (sc->sc_tx_done) { sc->sc_tx_done = 0; sci_txsoft(sc, tp); } } int sciintr(void *arg) { struct sci_softc *sc = arg; u_char *put, *end; u_int cc; u_short ssr; if (!device_is_active(sc->sc_dev)) return (0); end = sc->sc_ebuf; put = sc->sc_rbput; cc = sc->sc_rbavail; do { ssr = SHREG_SCSSR; if (ISSET(ssr, SCSSR_FER)) { SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_PER | SCSSR_FER); #if defined(DDB) || defined(KGDB) #ifdef SH4 if ((SHREG_SCSPTR & SCSPTR_SPB0DT) != 0) { #else if ((SHREG_SCSPDR & SCSPDR_SCP0DT) != 0) { #endif #ifdef DDB if (ISSET(sc->sc_hwflags, SCI_HW_CONSOLE)) { console_debugger(); } #endif #ifdef KGDB if (ISSET(sc->sc_hwflags, SCI_HW_KGDB)) { kgdb_connect(1); } #endif } #endif /* DDB || KGDB */ } if ((SHREG_SCSSR & SCSSR_RDRF) != 0) { if (cc > 0) { put[0] = SHREG_SCRDR; put[1] = SHREG_SCSSR & 0x00ff; put += 2; if (put >= end) put = sc->sc_rbuf; cc--; } SHREG_SCSSR &= ~(SCSSR_ORER | SCSSR_FER | SCSSR_PER | SCSSR_RDRF); /* * 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. */ if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && cc < sc->sc_r_hiwat) { SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); #if 0 sci_hwiflow(sc); #endif } /* * 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); SHREG_SCSCR &= ~SCSCR_RIE; } } else { if (SHREG_SCSSR & SCSSR_RDRF) { SHREG_SCSCR &= ~(SCSCR_TIE | SCSCR_RIE); delay(10); SHREG_SCSCR |= SCSCR_TIE | SCSCR_RIE; continue; } } } while (SHREG_SCSSR & SCSSR_RDRF); #if 0 msr = bus_space_read_1(iot, ioh, sci_msr); delta = msr ^ sc->sc_msr; sc->sc_msr = msr; if (ISSET(delta, sc->sc_msr_mask)) { SET(sc->sc_msr_delta, delta); /* * Pulse-per-second clock signal on edge of DCD? */ if (ISSET(delta, sc->sc_ppsmask)) { struct timeval tv; if (ISSET(msr, sc->sc_ppsmask) == sc->sc_ppsassert) { /* XXX nanotime() */ microtime(&tv); TIMEVAL_TO_TIMESPEC(&tv, &sc->ppsinfo.assert_timestamp); if (sc->ppsparam.mode & PPS_OFFSETASSERT) { timespecadd(&sc->ppsinfo.assert_timestamp, &sc->ppsparam.assert_offset, &sc->ppsinfo.assert_timestamp); TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.assert_timestamp); } #ifdef PPS_SYNC if (sc->ppsparam.mode & PPS_HARDPPSONASSERT) hardpps(&tv, tv.tv_usec); #endif sc->ppsinfo.assert_sequence++; sc->ppsinfo.current_mode = sc->ppsparam.mode; } else if (ISSET(msr, sc->sc_ppsmask) == sc->sc_ppsclear) { /* XXX nanotime() */ microtime(&tv); TIMEVAL_TO_TIMESPEC(&tv, &sc->ppsinfo.clear_timestamp); if (sc->ppsparam.mode & PPS_OFFSETCLEAR) { timespecadd(&sc->ppsinfo.clear_timestamp, &sc->ppsparam.clear_offset, &sc->ppsinfo.clear_timestamp); TIMESPEC_TO_TIMEVAL(&tv, &sc->ppsinfo.clear_timestamp); } #ifdef PPS_SYNC if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR) hardpps(&tv, tv.tv_usec); #endif sc->ppsinfo.clear_sequence++; sc->ppsinfo.current_mode = sc->ppsparam.mode; } } /* * Stop output immediately if we lose the output * flow control signal or carrier detect. */ if (ISSET(~msr, sc->sc_msr_mask)) { sc->sc_tbc = 0; sc->sc_heldtbc = 0; DPRINTF(("%s: sciintr\n", device_xname(sc->sc_dev))); } sc->sc_st_check = 1; } #endif /* * 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 ((SHREG_SCSSR & SCSSR_TDRE) != 0) { /* * If we've delayed a parameter change, do it now, and restart * output. */ if (sc->sc_heldchange) { sc->sc_heldchange = 0; sc->sc_tbc = sc->sc_heldtbc; sc->sc_heldtbc = 0; } /* Output the next chunk of the contiguous buffer, if any. */ if (sc->sc_tbc > 0) { sci_putc(*(sc->sc_tba)); sc->sc_tba++; sc->sc_tbc--; } else { /* Disable transmit completion interrupts if necessary. */ #if 0 if (ISSET(sc->sc_ier, IER_ETXRDY)) #endif SHREG_SCSCR &= ~SCSCR_TIE; if (sc->sc_tx_busy) { sc->sc_tx_busy = 0; sc->sc_tx_done = 1; } } } /* Wake up the poller. */ softint_schedule(sc->sc_si); #ifdef RND_SCI rnd_add_uint32(&sc->rnd_source, iir | lsr); #endif return (1); } void scicnprobe(struct consdev *cp) { int maj; /* locate the major number */ maj = cdevsw_lookup_major(&sci_cdevsw); /* Initialize required fields. */ cp->cn_dev = makedev(maj, 0); #ifdef SCICONSOLE cp->cn_pri = CN_REMOTE; #else cp->cn_pri = CN_NORMAL; #endif } void scicninit(struct consdev *cp) { InitializeSci(scicn_speed); sciisconsole = 1; } int scicngetc(dev_t dev) { int c; int s; s = splserial(); c = sci_getc(); splx(s); return (c); } void scicnputc(dev_t dev, int c) { int s; s = splserial(); sci_putc((u_char)c); splx(s); }