FreeBSD-5.3/sys/dev/zs/zs.c
/*-
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/dev/zs/zs.c,v 1.26 2004/07/15 20:47:40 phk Exp $");
/*-
* 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_comconsole.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/fcntl.h>
#include <sys/interrupt.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <sys/serial.h>
#include <sys/syslog.h>
#include <sys/tty.h>
#include <dev/zs/z8530reg.h>
#include <dev/zs/z8530var.h>
#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_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 void zsttystart(struct tty *tp);
static void zsttystop(struct tty *tp, int rw);
static int zsttyparam(struct tty *tp, struct termios *t);
static void zsttybreak(struct tty *tp, int brk);
static int zsttymodem(struct tty *tp, int biton, int bitoff);
static struct cdevsw zstty_cdevsw = {
.d_version = D_VERSION,
.d_open = zsttyopen,
.d_close = zsttyclose,
.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_modem = zsttymodem;
tp->t_break = zsttybreak;
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(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
if (sc->sc_console != 0)
brk = kdb_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(KDB) && 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(struct cdev *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 = tty_open(dev, tp);
if (error != 0)
return (error);
error = ttyld_open(tp, dev);
if (error != 0)
return (error);
return (0);
}
static int
zsttyclose(struct cdev *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);
tty_close(tp);
return (0);
}
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 void
zsttybreak(struct tty *tp, int brk)
{
struct zstty_softc *sc;
sc = tp->t_dev->si_drv1;
if (brk)
ZS_WRITE_REG(sc, 5, ZS_READ_REG(sc, 5) | ZSWR5_BREAK);
else
ZS_WRITE_REG(sc, 5, ZS_READ_REG(sc, 5) & ~ZSWR5_BREAK);
}
static int
zsttymodem(struct tty *tp, int biton, int bitoff)
{
/* 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);
if (t->c_ospeed != 0)
zsttymodem(tp, SER_DTR, 0);
else
zsttymodem(tp, 0, SER_DTR);
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);
}