Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
e08917ef90
NetBSD/sys/arch/arm/clps711x/clpscom.c

1111 lines
25 KiB
C
Raw Blame History

/* $NetBSD: clpscom.c,v 1.6 2015/04/13 21:18:41 riastradh Exp $ */
/*
* Copyright (c) 2013 KIYOHARA Takashi
* 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 ``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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: clpscom.c,v 1.6 2015/04/13 21:18:41 riastradh Exp $");
#include "rnd.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/intr.h>
#include <sys/kauth.h>
#include <sys/lwp.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/termios.h>
#include <sys/tty.h>
#include <sys/types.h>
#include <arm/clps711x/clps711xreg.h>
#include <arm/clps711x/clpssocvar.h>
#include <dev/cons.h>
#ifdef RND_COM
#include <sys/rndsource.h>
#endif
#include "ioconf.h"
#include "locators.h"
#define COMUNIT(x) TTUNIT(x)
#define COMDIALOUT(x) TTDIALOUT(x)
#define CLPSCOM_RING_SIZE 2048
#define UART_FIFO_SIZE 16
#define CLPSCOM_READ_CON(sc) \
bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_SYSCON)
#define CLPSCOM_WRITE_CON(sc, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_SYSCON, (val))
#define CLPSCOM_READ_FLG(sc) \
bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_SYSFLG)
#define CLPSCOM_WRITE_FLG(sc, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_SYSFLG, (val))
#define CLPSCOM_READ(sc) \
bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_UARTDR)
#define CLPSCOM_WRITE(sc, val) \
bus_space_write_1((sc)->sc_iot, (sc)->sc_ioh, PS711X_UARTDR, (val))
#define CLPSCOM_WRITE_MULTI(sc, val, n) \
bus_space_write_multi_1((sc)->sc_iot, (sc)->sc_ioh, PS711X_UARTDR, (val), (n))
#define CLPSCOM_READ_UBRLCR(sc) \
bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_UBRLCR)
#define CLPSCOM_WRITE_UBRLCR(sc, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, PS711X_UBRLCR, (val))
struct clpscom_softc {
device_t sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_irq[3];
void *sc_ih[3];
#define CLPSCOM_TXINT 0
#define CLPSCOM_RXINT 1
#define CLPSCOM_MSINT 2
void *sc_si;
struct tty *sc_tty;
u_char *sc_tba;
u_int sc_tbc;
u_char *sc_rbuf;
char *volatile sc_rbget;
char *volatile sc_rbput;
volatile int sc_rbavail;
#define CLPSCOM_MODEM_STATUS_MASK (SYSFLG_DCD | SYSFLG_DSR | SYSFLG_CTS)
uint32_t sc_ms;
uint32_t sc_ms_dcd;
uint32_t sc_ms_cts;
uint32_t sc_ms_mask;
uint32_t sc_ms_delta;
int sc_tx_stopped;
int sc_tx_done;
int sc_rx_ready;
int sc_ms_changed;
int sc_hwflags;
#define COM_HW_CONSOLE (1 << 0)
#define COM_HW_DEV_OK (1 << 1)
#define COM_HW_KGDB (1 << 2)
int sc_swflags;
#ifdef RND_COM
krandsource_t rnd_source;
#endif
};
static int clpscom_match(device_t, cfdata_t, void *);
static void clpscom_attach(device_t, device_t, void *);
static int clpscom_txintr(void *);
static int clpscom_rxintr(void *);
static int clpscom_msintr(void *);
static void clpscom_soft(void *);
static void clpscom_start(struct tty *);
static int clpscom_param(struct tty *, struct termios *);
static int clpscom_hwiflow(struct tty *, int);
dev_type_open(clpscomopen);
dev_type_close(clpscomclose);
dev_type_read(clpscomread);
dev_type_write(clpscomwrite);
dev_type_ioctl(clpscomioctl);
dev_type_stop(clpscomstop);
dev_type_tty(clpscomtty);
dev_type_poll(clpscompoll);
static void clpscom_iflush(struct clpscom_softc *);
static void clpscom_shutdown(struct clpscom_softc *);
static void clpscom_break(struct clpscom_softc *, int);
static int clpscom_to_tiocm(struct clpscom_softc *);
static void clpscom_rxsoft(struct clpscom_softc *, struct tty *);
static void clpscom_mssoft(struct clpscom_softc *, struct tty *);
static inline uint32_t clpscom_rate2ubrlcr(int);
static uint32_t clpscom_cflag2ubrlcr(tcflag_t);
static int clpscom_cngetc(dev_t);
static void clpscom_cnputc(dev_t, int);
static void clpscom_cnpollc(dev_t, int);
CFATTACH_DECL_NEW(clpscom, sizeof(struct clpscom_softc),
clpscom_match, clpscom_attach, NULL, NULL);
const struct cdevsw clpscom_cdevsw = {
.d_open = clpscomopen,
.d_close = clpscomclose,
.d_read = clpscomread,
.d_write = clpscomwrite,
.d_ioctl = clpscomioctl,
.d_stop = clpscomstop,
.d_tty = clpscomtty,
.d_poll = clpscompoll,
.d_mmap = nommap,
.d_kqfilter = ttykqfilter,
.d_discard = nodiscard,
.d_flag = D_TTY
};
static struct cnm_state clpscom_cnm_state;
static vaddr_t clpscom_cnaddr = 0;
static int clpscom_cnrate;
static tcflag_t clpscom_cncflag;
/* ARGSUSED */
static int
clpscom_match(device_t parent, cfdata_t match, void *aux)
{
return 1;
}
/* ARGSUSED */
static void
clpscom_attach(device_t parent, device_t self, void *aux)
{
struct clpscom_softc *sc = device_private(self);
struct clpssoc_attach_args *aa = aux;
int i;
aprint_naive("\n");
aprint_normal("\n");
sc->sc_dev = self;
sc->sc_iot = aa->aa_iot;
sc->sc_ioh = *aa->aa_ioh;
for (i = 0; i < __arraycount(aa->aa_irq); i++) {
sc->sc_irq[i] = aa->aa_irq[i];
sc->sc_ih[i] = NULL;
}
if (clpscom_cnaddr != 0)
SET(sc->sc_hwflags, COM_HW_CONSOLE);
sc->sc_tty = tty_alloc();
sc->sc_tty->t_oproc = clpscom_start;
sc->sc_tty->t_param = clpscom_param;
sc->sc_tty->t_hwiflow = clpscom_hwiflow;
sc->sc_tbc = 0;
sc->sc_rbuf = malloc(CLPSCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT);
if (sc->sc_rbuf == NULL) {
aprint_error_dev(self, "unable to allocate ring buffer\n");
return;
}
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = CLPSCOM_RING_SIZE;
tty_attach(sc->sc_tty);
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
int maj = cdevsw_lookup_major(&clpscom_cdevsw);
sc->sc_tty->t_dev = makedev(maj, device_unit(sc->sc_dev));
cn_tab->cn_dev = sc->sc_tty->t_dev;
aprint_normal_dev(self, "console\n");
}
sc->sc_si = softint_establish(SOFTINT_SERIAL, clpscom_soft, sc);
#ifdef RND_COM
rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_TTY, RND_FLAG_DEFAULT);
#endif
SET(sc->sc_hwflags, COM_HW_DEV_OK);
}
static int
clpscom_txintr(void *arg)
{
struct clpscom_softc *sc = arg;
uint32_t sysflg;
if (!device_is_active(sc->sc_dev))
return 0;
sysflg = CLPSCOM_READ_FLG(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(sysflg, SYSFLG_UTXFF)) {
/* Output the next chunk of the contiguous buffer, if any. */
if (sc->sc_tbc > 0) {
while (sc->sc_tbc > 0 && !ISSET(sysflg, SYSFLG_UTXFF)) {
CLPSCOM_WRITE(sc, *sc->sc_tba);
sc->sc_tba++;
sc->sc_tbc--;
sysflg = CLPSCOM_READ_FLG(sc);
}
} else if (!ISSET(sysflg, SYSFLG_UBUSY) &&
sc->sc_ih[CLPSCOM_TXINT] != NULL) {
intr_disestablish(sc->sc_ih[CLPSCOM_TXINT]);
sc->sc_ih[CLPSCOM_TXINT] = NULL;
sc->sc_tx_done = 1;
}
}
/* Wake up the poller. */
softint_schedule(sc->sc_si);
return 1;
}
static int
clpscom_rxintr(void *arg)
{
struct clpscom_softc *sc = arg;
int cc;
uint32_t sysflg;
uint16_t data;
u_char *put;
if (!device_is_active(sc->sc_dev))
return 0;
if (sc->sc_ih[CLPSCOM_RXINT] != NULL) {
put = sc->sc_rbput;
cc = sc->sc_rbavail;
while (cc > 0) {
sysflg = CLPSCOM_READ_FLG(sc);
if (ISSET(sysflg, SYSFLG_URXFE))
break;
data = CLPSCOM_READ(sc);
cn_check_magic(sc->sc_tty->t_dev, data & 0xff,
clpscom_cnm_state);
put[0] = data & 0xff;
put[1] = (data >> 8) & 0xff;
put += 2;
if (put >= sc->sc_rbuf + (CLPSCOM_RING_SIZE << 1))
put = sc->sc_rbuf;
cc--;
sc->sc_rx_ready = 1;
}
/*
* 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;
/*
* See if we are in danger of overflowing a buffer. If
* so, use hardware flow control to ease the pressure.
*/
/* but clpscom cannot. X-( */
/*
* If we're out of space, disable receive interrupts
* until the queue has drained a bit.
*/
if (cc <= 0) {
intr_disestablish(sc->sc_ih[CLPSCOM_RXINT]);
sc->sc_ih[CLPSCOM_RXINT] = NULL;
}
}
/* Wake up the poller. */
softint_schedule(sc->sc_si);
return 1;
}
static int
clpscom_msintr(void *arg)
{
struct clpscom_softc *sc = arg;
uint32_t ms, delta;
if (!device_is_active(sc->sc_dev))
return 0;
if (sc->sc_ih[CLPSCOM_MSINT] != NULL) {
ms = CLPSCOM_READ_FLG(sc) & CLPSCOM_MODEM_STATUS_MASK;
delta = ms ^ sc->sc_ms;
sc->sc_ms = ms;
if (ISSET(delta, sc->sc_ms_mask)) {
SET(sc->sc_ms_delta, delta);
/*
* Stop output immediately if we lose the output
* flow control signal or carrier detect.
*/
if (ISSET(~ms, sc->sc_ms_mask))
sc->sc_tbc = 0;
sc->sc_ms_changed = 1;
}
}
bus_space_write_4(sc->sc_iot, sc->sc_ioh, PS711X_UMSEOI, 1);
/* Wake up the poller. */
softint_schedule(sc->sc_si);
return 1;
}
static void
clpscom_soft(void *arg)
{
struct clpscom_softc *sc = arg;
struct tty *tp = sc->sc_tty;
if (!device_is_active(sc->sc_dev))
return;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
clpscom_rxsoft(sc, tp);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
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);
}
if (sc->sc_ms_changed == 1) {
sc->sc_ms_changed = 0;
clpscom_mssoft(sc, tp);
}
}
static void
clpscom_start(struct tty *tp)
{
struct clpscom_softc *sc
= device_lookup_private(&clpscom_cd, COMUNIT(tp->t_dev));
int s, n;
if (!device_is_active(sc->sc_dev))
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);
if (sc->sc_ih[CLPSCOM_TXINT] == NULL) {
sc->sc_ih[CLPSCOM_TXINT] =
intr_establish(sc->sc_irq[CLPSCOM_TXINT], IPL_SERIAL, 0,
clpscom_txintr, sc);
if (sc->sc_ih[CLPSCOM_TXINT] == NULL)
printf("%s: can't establish tx interrupt\n",
device_xname(sc->sc_dev));
/* Output the first chunk of the contiguous buffer. */
n = min(sc->sc_tbc, UART_FIFO_SIZE);
CLPSCOM_WRITE_MULTI(sc, sc->sc_tba, n);
sc->sc_tba += n;
sc->sc_tbc -= n;
}
out:
splx(s);
return;
}
static int
clpscom_param(struct tty *tp, struct termios *t)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(tp->t_dev));
int s;
if (!device_is_active(sc->sc_dev))
return ENXIO;
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;
/*
* If we're not in a mode that assumes a connection is present, then
* ignore carrier changes.
*/
if (ISSET(t->c_cflag, CLOCAL | MDMBUF))
sc->sc_ms_dcd = 0;
else
sc->sc_ms_dcd = SYSFLG_DCD;
/*
* Set the flow control pins depending on the current flow control
* mode.
*/
if (ISSET(t->c_cflag, CRTSCTS)) {
sc->sc_ms_cts = SYSFLG_CTS;
} else if (ISSET(t->c_cflag, MDMBUF)) {
/*
* For DTR/DCD flow control, make sure we don't toggle DTR for
* carrier detection.
*/
sc->sc_ms_cts = SYSFLG_DCD;
} else {
/*
* If no flow control, then always set RTS. This will make
* the other side happy if it mistakenly thinks we're doing
* RTS/CTS flow control.
*/
sc->sc_ms_cts = 0;
}
sc->sc_ms_mask = sc->sc_ms_cts | sc->sc_ms_dcd;
s = splserial();
CLPSCOM_WRITE_UBRLCR(sc,
UBRLCR_FIFOEN |
clpscom_rate2ubrlcr(t->c_ospeed) |
clpscom_cflag2ubrlcr(t->c_cflag));
/* And copy to tty. */
tp->t_ispeed = 0;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
splx(s);
/*
* Update the tty layer's idea of the carrier bit, in case we changed
* CLOCAL or MDMBUF. We don't hang up here; we only do that by
* explicit request.
*/
(*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_ms, SYSFLG_DCD));
if (!ISSET(t->c_cflag, CHWFLOW))
if (sc->sc_tx_stopped) {
sc->sc_tx_stopped = 0;
clpscom_start(tp);
}
return 0;
}
static int
clpscom_hwiflow(struct tty *tp, int block)
{
/* Nothing */
return 0;
}
/* ARGSUSED */
int
clpscomopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct clpscom_softc *sc;
struct tty *tp;
int error, s, s2;
sc = device_lookup_private(&clpscom_cd, COMUNIT(dev));
if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK))
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;
/* Enable and turn on interrupt */
CLPSCOM_WRITE_CON(sc, CLPSCOM_READ_CON(sc) | SYSCON_UARTEN);
/* Fetch the current modem control status, needed later. */
sc->sc_ms = CLPSCOM_READ_FLG(sc) & CLPSCOM_MODEM_STATUS_MASK;
/*
* 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 = clpscom_cnrate;
t.c_cflag = clpscom_cncflag;
} 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 pscom_param() we do something */
tp->t_ospeed = 0;
clpscom_param(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. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = CLPSCOM_RING_SIZE;
clpscom_iflush(sc);
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.
*/
clpscom_shutdown(sc);
/* Disable UART */
if (!ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
CLPSCOM_WRITE_CON(sc,
CLPSCOM_READ_CON(sc) & ~SYSCON_UARTEN);
}
return error;
}
/* ARGSUSED */
int
clpscomclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
/* XXXX 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;
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.
*/
clpscom_shutdown(sc);
/* Disable UART */
if (!ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
CLPSCOM_WRITE_CON(sc,
CLPSCOM_READ_CON(sc) & ~SYSCON_UARTEN);
}
return 0;
}
int
clpscomread(dev_t dev, struct uio *uio, int flag)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (!device_is_active(sc->sc_dev))
return EIO;
return (*tp->t_linesw->l_read)(tp, uio, flag);
}
int
clpscomwrite(dev_t dev, struct uio *uio, int flag)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (!device_is_active(sc->sc_dev))
return EIO;
return (*tp->t_linesw->l_write)(tp, uio, flag);
}
int
clpscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
int error, 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;
switch (cmd) {
case TIOCSFLAGS:
error = kauth_authorize_device_tty(l->l_cred,
KAUTH_DEVICE_TTY_PRIVSET, tp);
break;
default:
break;
}
if (error)
return error;
s = splserial();
error = 0;
switch (cmd) {
case TIOCSBRK:
clpscom_break(sc, 1);
break;
case TIOCCBRK:
clpscom_break(sc, 0);
break;
case TIOCGFLAGS:
*(int *)data = sc->sc_swflags;
break;
case TIOCSFLAGS:
sc->sc_swflags = *(int *)data;
break;
case TIOCMGET:
*(int *)data = clpscom_to_tiocm(sc);
break;
default:
error = EPASSTHROUGH;
break;
}
splx(s);
return error;
}
int
clpscompoll(dev_t dev, int events, struct lwp *l)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (!device_is_active(sc->sc_dev))
return EIO;
return (*tp->t_linesw->l_poll)(tp, events, l);
}
struct tty *
clpscomtty(dev_t dev)
{
struct clpscom_softc *sc =
device_lookup_private(&clpscom_cd, COMUNIT(dev));
return sc->sc_tty;
}
void
clpscomstop(struct tty *tp, int flag)
{
int s;
s = splserial();
if (ISSET(tp->t_state, TS_BUSY)) {
/* Stop transmitting at the next chunk. */
if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
}
splx(s);
}
static void
clpscom_iflush(struct clpscom_softc *sc)
{
int timo;
timo = 50000;
while ((CLPSCOM_READ_FLG(sc) & SYSFLG_URXFE) == 0
&& timo--)
CLPSCOM_READ(sc);
if (timo == 0)
printf("%s: iflush timeout\n", device_xname(sc->sc_dev));
}
static void
clpscom_shutdown(struct clpscom_softc *sc)
{
int s;
s = splserial();
/* Turn off all interrupts */
if (sc->sc_ih[CLPSCOM_TXINT] != NULL)
intr_disestablish(sc->sc_ih[CLPSCOM_TXINT]);
sc->sc_ih[CLPSCOM_TXINT] = NULL;
if (sc->sc_ih[CLPSCOM_RXINT] != NULL)
intr_disestablish(sc->sc_ih[CLPSCOM_RXINT]);
sc->sc_ih[CLPSCOM_RXINT] = NULL;
if (sc->sc_ih[CLPSCOM_MSINT] != NULL)
intr_disestablish(sc->sc_ih[CLPSCOM_MSINT]);
sc->sc_ih[CLPSCOM_MSINT] = NULL;
/* Clear any break condition set with TIOCSBRK. */
clpscom_break(sc, 0);
splx(s);
}
static void
clpscom_break(struct clpscom_softc *sc, int onoff)
{
int s;
uint8_t ubrlcr;
s = splserial();
ubrlcr = CLPSCOM_READ_UBRLCR(sc);
if (onoff)
SET(ubrlcr, UBRLCR_BREAK);
else
CLR(ubrlcr, UBRLCR_BREAK);
CLPSCOM_WRITE_UBRLCR(sc, ubrlcr);
splx(s);
}
static int
clpscom_to_tiocm(struct clpscom_softc *sc)
{
uint32_t combits;
int ttybits = 0;
combits = sc->sc_ms;
if (ISSET(combits, SYSFLG_DCD))
SET(ttybits, TIOCM_CD);
if (ISSET(combits, SYSFLG_CTS))
SET(ttybits, TIOCM_CTS);
if (ISSET(combits, SYSFLG_DSR))
SET(ttybits, TIOCM_DSR);
return ttybits;
}
static void
clpscom_rxsoft(struct clpscom_softc *sc, struct tty *tp)
{
int code, s;
u_int cc, scc;
u_char sts, *get;
get = sc->sc_rbget;
scc = cc = CLPSCOM_RING_SIZE - sc->sc_rbavail;
while (cc) {
code = get[0];
sts = get[1];
if (ISSET(sts, UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR)) {
if (ISSET(sts, (UARTDR_FRMERR)))
SET(code, TTY_FE);
if (ISSET(sts, UARTDR_PARERR))
SET(code, TTY_PE);
if (ISSET(sts, UARTDR_OVERR))
; /* XXXXX: Overrun */
}
if ((*tp->t_linesw->l_rint)(code, tp) == -1) {
/*
* The line discipline's buffer is out of space.
*/
/*
* 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 >= sc->sc_rbuf + (CLPSCOM_RING_SIZE << 1))
get -= (CLPSCOM_RING_SIZE << 1);
cc = 0;
break;
}
get += 2;
if (get >= sc->sc_rbuf + (CLPSCOM_RING_SIZE << 1))
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 (sc->sc_ih[CLPSCOM_RXINT] == NULL) {
sc->sc_ih[CLPSCOM_RXINT] =
intr_establish(sc->sc_irq[CLPSCOM_RXINT],
IPL_SERIAL, 0, clpscom_rxintr, sc);
if (sc->sc_ih[CLPSCOM_RXINT] == NULL)
printf("%s: can't establish"
" rx interrupt\n",
device_xname(sc->sc_dev));
}
if (sc->sc_ih[CLPSCOM_MSINT] == NULL) {
sc->sc_ih[CLPSCOM_MSINT] =
intr_establish(sc->sc_irq[CLPSCOM_MSINT],
IPL_SERIAL, 0, clpscom_msintr, sc);
if (sc->sc_ih[CLPSCOM_MSINT] == NULL)
printf("%s: can't establish"
" ms interrupt\n",
device_xname(sc->sc_dev));
}
}
splx(s);
}
}
static void
clpscom_mssoft(struct clpscom_softc *sc, struct tty *tp)
{
uint32_t ms, delta;
ms = sc->sc_ms;
delta = sc->sc_ms_delta;
sc->sc_ms_delta = 0;
if (ISSET(delta, sc->sc_ms_dcd))
/*
* Inform the tty layer that carrier detect changed.
*/
(void) (*tp->t_linesw->l_modem)(tp, ISSET(ms, SYSFLG_DCD));
if (ISSET(delta, sc->sc_ms_cts)) {
/* Block or unblock output according to flow control. */
if (ISSET(ms, sc->sc_ms_cts)) {
sc->sc_tx_stopped = 0;
(*tp->t_linesw->l_start)(tp);
} else
sc->sc_tx_stopped = 1;
}
}
static inline uint32_t
clpscom_rate2ubrlcr(int rate)
{
return 230400 / rate - 1;
}
static uint32_t
clpscom_cflag2ubrlcr(tcflag_t cflag)
{
int32_t ubrlcr = 0;
switch (cflag & CSIZE) {
case CS5: SET(ubrlcr, UBRLCR_WRDLEN_5B); break;
case CS6: SET(ubrlcr, UBRLCR_WRDLEN_6B); break;
case CS7: SET(ubrlcr, UBRLCR_WRDLEN_7B); break;
case CS8: SET(ubrlcr, UBRLCR_WRDLEN_8B); break;
default: SET(ubrlcr, UBRLCR_WRDLEN_8B); break;
}
if (cflag & CSTOPB)
SET(ubrlcr, UBRLCR_XSTOP);
if (cflag & PARENB) {
SET(ubrlcr, (UBRLCR_PRTEN | UBRLCR_EVENPRT));
if (cflag & PARODD)
CLR(ubrlcr, UBRLCR_EVENPRT);
}
return ubrlcr;
}
#define CLPSCOM_CNREAD() \
(*(volatile uint32_t *)(clpscom_cnaddr + PS711X_UARTDR))
#define CLPSCOM_CNWRITE(val) \
(*(volatile uint8_t *)(clpscom_cnaddr + PS711X_UARTDR) = val)
#define CLPSCOM_CNSTATUS() \
(*(volatile uint32_t *)(clpscom_cnaddr + PS711X_SYSFLG))
static struct consdev clpscomcons = {
NULL, NULL, clpscom_cngetc, clpscom_cnputc, clpscom_cnpollc,
NULL, NULL, NULL, NODEV, CN_NORMAL
};
int
clpscom_cnattach(vaddr_t addr, int rate, tcflag_t cflag)
{
clpscom_cnaddr = addr;
clpscom_cnrate = rate;
clpscom_cncflag = cflag;
*(volatile uint32_t *)(clpscom_cnaddr + PS711X_SYSFLG) |= SYSCON_UARTEN;
*(volatile uint32_t *)(clpscom_cnaddr + PS711X_UBRLCR) =
UBRLCR_FIFOEN |
clpscom_cflag2ubrlcr(cflag) |
clpscom_rate2ubrlcr(rate);
cn_tab = &clpscomcons;
cn_init_magic(&clpscom_cnm_state);
cn_set_magic("\047\001"); /* default magic is BREAK */
return 0;
}
/* ARGSUSED */
static int
clpscom_cngetc(dev_t dev)
{
int s = splserial();
char ch;
while (CLPSCOM_CNSTATUS() & SYSFLG_URXFE);
ch = CLPSCOM_CNREAD();
{
#ifdef DDB
extern int db_active;
if (!db_active)
#endif
cn_check_magic(dev, ch, clpscom_cnm_state);
}
splx(s);
return ch;
}
/* ARGSUSED */
static void
clpscom_cnputc(dev_t dev, int c)
{
int s = splserial();
while (CLPSCOM_CNSTATUS() & SYSFLG_UTXFF);
CLPSCOM_CNWRITE(c);
/* Make sure output. */
while (CLPSCOM_CNSTATUS() & SYSFLG_UBUSY);
splx(s);
}
/* ARGSUSED */
static void
clpscom_cnpollc(dev_t dev, int on)
{
/* Nothing */
}
Reference in New Issue View Git Blame Copy Permalink