/*
* Open a zs serial (tty) port.
*/
int
zsopen(dev_t dev, int flags, int mode, struct proc *p)
{
struct zstty_softc *zst;
struct zs_chanstate *cs;
struct tty *tp;
int s;
#if IPL_ZS != IPL_TTY
int s2;
#endif
int error;
zst = zs_device_lookup(&zstty_cd, ZSUNIT(dev));
if (zst == NULL)
return (ENXIO);
tp = zst->zst_tty;
cs = zst->zst_cs;
/* If KGDB took the line, then tp==NULL */
if (tp == NULL)
return (EBUSY);
if (ISSET(tp->t_state, TS_ISOPEN) &&
ISSET(tp->t_state, TS_XCLUDE) &&
suser(p, 0) != 0)
return (EBUSY);
s = spltty();
/*
* Do the following iff this is a first open.
*/
if (!ISSET(tp->t_state, TS_ISOPEN)) {
struct termios t;
tp->t_dev = dev;
/* Call the power management hook. */
if (cs->enable) {
if ((*cs->enable)(cs)) {
splx(s);
printf("%s: device enable failed\n",
zst->zst_dev.dv_xname);
return (EIO);
}
}
/*
* Initialize the termios status to the defaults. Add in the
* sticky bits from TIOCSFLAGS.
*/
t.c_ispeed = 0;
t.c_ospeed = cs->cs_defspeed;
t.c_cflag = cs->cs_defcflag;
if (ISSET(zst->zst_swflags, TIOCFLAG_CLOCAL))
SET(t.c_cflag, CLOCAL);
if (ISSET(zst->zst_swflags, TIOCFLAG_CRTSCTS))
SET(t.c_cflag, CRTSCTS);
if (ISSET(zst->zst_swflags, TIOCFLAG_MDMBUF))
SET(t.c_cflag, MDMBUF);
#if IPL_ZS != IPL_TTY
s2 = splzs();
#endif
/*
* Turn on receiver and status interrupts.
* We defer the actual write of the register to zsparam(),
* but we must make sure status interrupts are turned on by
* the time zsparam() reads the initial rr0 state.
*/
SET(cs->cs_preg[1], ZSWR1_RIE | ZSWR1_TIE | ZSWR1_SIE);
/* Clear PPS capture state on first open. */
zst->zst_ppsmask = 0;
#if IPL_ZS != IPL_TTY
splx(s2);
#endif
/* Make sure zsparam will see changes. */
tp->t_ospeed = 0;
(void)zsparam(tp, &t);
/*
* Note: zsparam has done: cflag, ispeed, ospeed
* so we just need to do: iflag, oflag, lflag, cc
* For "raw" mode, just leave all zeros.
*/
if (!ISSET(zst->zst_hwflags, ZS_HWFLAG_RAW)) {
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
} else {
tp->t_iflag = 0;
tp->t_oflag = 0;
tp->t_lflag = 0;
}
ttychars(tp);
ttsetwater(tp);
if (ZSDIALOUT(dev))
SET(tp->t_state, TS_CARR_ON);
else
CLR(tp->t_state, TS_CARR_ON);
#if IPL_ZS != IPL_TTY
s2 = splzs();
#endif
/* Clear the input ring, and unblock. */
zst->zst_rbget = zst->zst_rbput = zst->zst_rbuf;
zst->zst_rbavail = zstty_rbuf_size;
zs_iflush(cs);
CLR(zst->zst_rx_flags, RX_ANY_BLOCK);
zs_hwiflow(zst);
#if IPL_ZS != IPL_TTY
splx(s2);
#endif
}
if (ZSDIALOUT(dev)) {
if (ISSET(tp->t_state, TS_ISOPEN)) {
/* someone already is dialed in... */
splx(s);
return EBUSY;
}
cs->cs_cua = 1;
}
error = 0;
/* wait for carrier if necessary */
if (ISSET(flags, O_NONBLOCK)) {
if (!ZSDIALOUT(dev) && cs->cs_cua) {
/* Opening TTY non-blocking... but the CUA is busy */
error = EBUSY;
}
} else
while (cs->cs_cua ||
(!ISSET(tp->t_cflag, CLOCAL) && !ISSET(tp->t_state, TS_CARR_ON))) {
int rr0;
error = 0;
SET(tp->t_state, TS_WOPEN);
if (!ZSDIALOUT(dev) && !cs->cs_cua) {
/*
* Turn on DTR. We must always do this on non-CUA
* devices, even if carrier is not present, because
* otherwise we'd have to use TIOCSDTR immediately
* after setting CLOCAL, which applications do not
* expect. We always assert DTR while the device is
* open unless explicitly requested to deassert it.
*/
#if IPL_ZS != IPL_TTY
s2 = splzs();
#endif
zs_modem(zst, 1);
rr0 = zs_read_csr(cs);
#if IPL_ZS != IPL_TTY
splx(s2);
#endif
/* loop, turning on the device, until carrier present */
if (ISSET(rr0, ZSRR0_DCD) ||
ISSET(zst->zst_swflags, TIOCFLAG_SOFTCAR))
SET(tp->t_state, TS_CARR_ON);
}
if ((ISSET(tp->t_cflag, CLOCAL) ||
ISSET(tp->t_state, TS_CARR_ON)) && !cs->cs_cua)
break;
error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
ttopen, 0);
if (!ZSDIALOUT(dev) && cs->cs_cua && error == EINTR) {
error = 0;
continue;
}
if (error) {
if (!ISSET(tp->t_state, TS_ISOPEN)) {
#if IPL_ZS != IPL_TTY
s2 = splzs();
#endif
zs_modem(zst, 0);
#if IPL_ZS != IPL_TTY
splx(s2);
#endif
CLR(tp->t_state, TS_WOPEN);
ttwakeup(tp);
}
if (ZSDIALOUT(dev))
cs->cs_cua = 0;
CLR(tp->t_state, TS_WOPEN);
break;
}
if (!ZSDIALOUT(dev) && cs->cs_cua)
continue;
}
splx(s);
if (error == 0)
error = ((*linesw[tp->t_line].l_open)(dev, tp, p));
if (error)
goto bad;
return (0);
bad:
if (!ISSET(tp->t_state, TS_ISOPEN)) {
/*
* We failed to open the device, and nobody else had it opened.
* Clean up the state as appropriate.
*/
zs_shutdown(zst);
}
return (error);
}
/*
* Write the given register set to the given zs channel in the proper order.
* The channel must not be transmitting at the time. The receiver will
* be disabled for the time it takes to write all the registers.
* Call this with interrupts disabled.
*/
void
zs_loadchannelregs(struct zs_chanstate *cs)
{
uint8_t *reg, v;
zs_write_csr(cs, ZSM_RESET_ERR); /* XXX: reset error condition */
#if 1
/*
* XXX: Is this really a good idea?
* XXX: Should go elsewhere! -gwr
*/
zs_iflush(cs); /* XXX */
#endif
if (cs->cs_ctl_chan != NULL)
v = ((cs->cs_ctl_chan->cs_creg[5] & (ZSWR5_RTS | ZSWR5_DTR)) !=
(cs->cs_ctl_chan->cs_preg[5] & (ZSWR5_RTS | ZSWR5_DTR)));
else
v = 0;
if (memcmp((void *)cs->cs_preg, (void *)cs->cs_creg, 16) == 0 && !v)
return; /* only change if values are different */
/* Copy "pending" regs to "current" */
memcpy((void *)cs->cs_creg, (void *)cs->cs_preg, 16);
reg = cs->cs_creg; /* current regs */
/* disable interrupts */
zs_write_reg(cs, 1, reg[1] & ~ZSWR1_IMASK);
/* baud clock divisor, stop bits, parity */
zs_write_reg(cs, 4, reg[4]);
/* misc. TX/RX control bits */
zs_write_reg(cs, 10, reg[10]);
/* char size, enable (RX/TX) */
zs_write_reg(cs, 3, reg[3] & ~ZSWR3_RX_ENABLE);
zs_write_reg(cs, 5, reg[5] & ~ZSWR5_TX_ENABLE);
/* synchronous mode stuff */
zs_write_reg(cs, 6, reg[6]);
zs_write_reg(cs, 7, reg[7]);
#if 0
/*
* Registers 2 and 9 are special because they are
* actually common to both channels, but must be
* programmed through channel A. The "zsc" attach
* function takes care of setting these registers
* and they should not be touched thereafter.
*/
/* interrupt vector */
zs_write_reg(cs, 2, reg[2]);
/* master interrupt control */
zs_write_reg(cs, 9, reg[9]);
#endif
/* Shut down the BRG */
zs_write_reg(cs, 14, reg[14] & ~ZSWR14_BAUD_ENA);
#ifdef ZS_MD_SETCLK
/* Let the MD code setup any external clock. */
ZS_MD_SETCLK(cs);
#endif /* ZS_MD_SETCLK */
/* clock mode control */
zs_write_reg(cs, 11, reg[11]);
/* baud rate (lo/hi) */
zs_write_reg(cs, 12, reg[12]);
zs_write_reg(cs, 13, reg[13]);
/* Misc. control bits */
zs_write_reg(cs, 14, reg[14]);
/* which lines cause status interrupts */
zs_write_reg(cs, 15, reg[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_csr(cs, ZSM_RESET_STINT);
zs_write_csr(cs, ZSM_RESET_STINT);
/* char size, enable (RX/TX)*/
zs_write_reg(cs, 3, reg[3]);
zs_write_reg(cs, 5, reg[5]);
/* Write the status bits on the alternate channel also. */
if (cs->cs_ctl_chan != NULL) {
v = cs->cs_ctl_chan->cs_preg[5];
cs->cs_ctl_chan->cs_creg[5] = v;
zs_write_reg(cs->cs_ctl_chan, 5, v);
}
/* interrupt enables: RX, TX, STATUS */
zs_write_reg(cs, 1, reg[1]);
}