NetBSD-5.0.2/sys/arch/sh3/dev/sci.c
/* $NetBSD: sci.c,v 1.51 2008/06/13 13:08:57 cegger 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sci.c,v 1.51 2008/06/13 13:08:57 cegger Exp $");
#include "opt_kgdb.h"
#include "opt_sci.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/syslog.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/kauth.h>
#include <sys/intr.h>
#include <dev/cons.h>
#include <sh3/clock.h>
#include <sh3/scireg.h>
#include <sh3/pfcreg.h>
#include <sh3/tmureg.h>
#include <sh3/exception.h>
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 {
struct device 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(struct device *, struct cfdata *, void *);
static void sci_attach(struct device *, struct device *, 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_MASK 0x7ffff
#define SCIDIALOUT_MASK 0x80000
#define SCIUNIT(x) (minor(x) & SCIUNIT_MASK)
#define SCIDIALOUT(x) (minor(x) & SCIDIALOUT_MASK)
/* 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(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 = {
sciopen, sciclose, sciread, sciwrite, sciioctl,
scistop, scitty, scipoll, nommap, ttykqfilter, 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(struct device *parent, struct cfdata *cfp, void *aux)
{
if (strcmp(cfp->cf_name, "sci") || sci_attached)
return 0;
return 1;
}
static void
sci_attach(struct device *parent, struct device *self, void *aux)
{
struct sci_softc *sc = (struct sci_softc *)self;
struct tty *tp;
sci_attached = 1;
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", sc->sc_dev.dv_xname);
} 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 = ttymalloc();
tp->t_oproc = scistart;
tp->t_param = sciparam;
tp->t_hwiflow = NULL;
sc->sc_tty = tp;
sc->sc_rbuf = malloc(sci_rbuf_size << 1, M_DEVBUF, M_NOWAIT);
if (sc->sc_rbuf == NULL) {
printf("%s: unable to allocate ring buffer\n",
sc->sc_dev.dv_xname);
return;
}
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);
#ifdef SCI_DEBUG
if (sci_debug)
scistatus(sc, "sciparam ");
#endif
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;
volatile unsigned char 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;
}
c = 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
#ifdef SCI_DEBUG
if (sci_debug)
scistatus(sc, "sciopen ");
#endif
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",
sc->sc_dev.dv_xname,
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(sc, tp)
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;
}
}
#ifdef SCI_DEBUG
if (sci_debug)
scistatus(sc, "sci_stsoft");
#endif
#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;
#ifdef SCI_DEBUG
if (sci_debug)
scistatus(sc, "sciintr ");
#endif
}
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);
#if NRND > 0 && defined(RND_SCI)
rnd_add_uint32(&sc->rnd_source, iir | lsr);
#endif
return (1);
}
void
scicnprobe(cp)
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);
}