NetBSD-5.0.2/sys/arch/arm/at91/at91usart.c
/* $Id: at91usart.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */
/* $NetBSD: at91usart.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */
/*
* Copyright (c) 2007 Embedtronics Oy. All rights reserved.
*
* Copyright (c) 1998, 1999, 2001, 2002, 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jesse Off
*
* This code is derived from software contributed to The NetBSD Foundation
* by Ichiro FUKUHARA and Naoto Shimazaki.
*
* This code is derived from software contributed to The NetBSD Foundation
* by IWAMOTO Toshihiro.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 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
*/
/*
* TODO: hardware flow control
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: at91usart.c,v 1.2 2008/07/03 01:15:39 matt Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "rnd.h"
#if NRND > 0 && defined(RND_COM)
#include <sys/rnd.h>
#endif
#ifdef NOTYET
/*
* Override cnmagic(9) macro before including <sys/systm.h>.
* We need to know if cn_check_magic triggered debugger, so set a flag.
* Callers of cn_check_magic must declare int cn_trapped = 0;
* XXX: this is *ugly*!
*/
#define cn_trap() \
do { \
console_debugger(); \
cn_trapped = 1; \
} while (/* CONSTCOND */ 0)
#endif /* NOTYET */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/tty.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/kauth.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <arm/at91/at91reg.h>
#include <arm/at91/at91var.h>
#include <arm/at91/at91usartreg.h>
#include <arm/at91/at91usartvar.h>
#include <dev/cons.h>
static int at91usart_param(struct tty *, struct termios *);
static void at91usart_start(struct tty *);
static int at91usart_hwiflow(struct tty *, int);
#if 0
static u_int cflag2lcrhi(tcflag_t);
#endif
static void at91usart_set(struct at91usart_softc *);
#if NOTYET
int at91usart_cn_getc(dev_t);
void at91usart_cn_putc(dev_t, int);
void at91usart_cn_pollc(dev_t, int);
void at91usart_cn_probe(struct consdev *);
void at91usart_cn_init(struct consdev *);
static struct at91usart_cons_softc {
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
bus_addr_t sc_hwbase;
int sc_ospeed;
tcflag_t sc_cflag;
int sc_attached;
u_int8_t *sc_rx_ptr;
u_int8_t sc_rx_fifo[64];
} usart_cn_sc;
static struct cnm_state at91usart_cnm_state;
#endif /* NOTYET */
static void at91usart_soft(void* arg);
inline static void at91usart_txsoft(struct at91usart_softc *, struct tty *);
inline static void at91usart_rxsoft(struct at91usart_softc *, struct tty *, unsigned csr);
#define PDC_BLOCK_SIZE 64
//CFATTACH_DECL(at91usart, sizeof(struct at91usart_softc),
// at91usart_match, at91usart_attach, NULL, NULL);
//#define USART_DEBUG 10
#ifdef USART_DEBUG
int usart_debug = USART_DEBUG;
#define DPRINTFN(n,fmt) if (usart_debug >= (n)) printf fmt
#else
#define DPRINTFN(n,fmt)
#endif
extern struct cfdriver at91usart_cd;
dev_type_open(at91usart_open);
dev_type_close(at91usart_close);
dev_type_read(at91usart_read);
dev_type_write(at91usart_write);
dev_type_ioctl(at91usart_ioctl);
dev_type_stop(at91usart_stop);
dev_type_tty(at91usart_tty);
dev_type_poll(at91usart_poll);
const struct cdevsw at91usart_cdevsw = {
at91usart_open, at91usart_close, at91usart_read, at91usart_write, at91usart_ioctl,
at91usart_stop, at91usart_tty, at91usart_poll, nommap, ttykqfilter, D_TTY
};
#if NOTYET
struct consdev at91usart_cons = {
at91usart_cn_probe, NULL, at91usart_cn_getc, at91usart_cn_putc, at91usart_cn_pollc, NULL,
NULL, NULL, NODEV, CN_REMOTE
};
#endif /* NOTYET */
#ifndef DEFAULT_COMSPEED
#define DEFAULT_COMSPEED 115200
#endif
#define COMUNIT_MASK 0x7ffff
#define COMDIALOUT_MASK 0x80000
#define COMUNIT(x) (minor(x) & COMUNIT_MASK)
#define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK)
#define COM_ISALIVE(sc) ((sc)->enabled != 0 && device_is_active((sc)->sc_dev))
static inline void
at91usart_writereg(struct at91usart_softc *sc, int reg, u_int val)
{
bus_space_write_4(sc->sc_iot, sc->sc_ioh, reg, val);
}
static inline u_int
at91usart_readreg(struct at91usart_softc *sc, int reg)
{
return bus_space_read_4(sc->sc_iot, sc->sc_ioh, reg);
}
#if 0
static int
at91usart_match(device_t parent, cfdata_t cf, void *aux)
{
if (strcmp(cf->cf_name, "at91usart") == 0)
return 1;
return 0;
}
#endif
static int at91usart_intr(void* arg);
void
at91usart_attach_subr(struct at91usart_softc *sc, struct at91bus_attach_args *sa)
{
struct tty *tp;
int err;
printf("\n");
if (bus_space_map(sa->sa_iot, sa->sa_addr, sa->sa_size, 0, &sc->sc_ioh))
panic("%s: Cannot map registers", device_xname(sc->sc_dev));
sc->sc_iot = sa->sa_iot;
sc->sc_hwbase = sa->sa_addr;
sc->sc_dmat = sa->sa_dmat;
sc->sc_pid = sa->sa_pid;
/* allocate fifos */
err = at91pdc_alloc_fifo(sc->sc_dmat, &sc->sc_rx_fifo, AT91USART_RING_SIZE, BUS_DMA_READ | BUS_DMA_STREAMING);
if (err)
panic("%s: cannot allocate rx fifo", device_xname(sc->sc_dev));
err = at91pdc_alloc_fifo(sc->sc_dmat, &sc->sc_tx_fifo, AT91USART_RING_SIZE, BUS_DMA_WRITE | BUS_DMA_STREAMING);
if (err)
panic("%s: cannot allocate tx fifo", device_xname(sc->sc_dev));
/* initialize uart */
at91_peripheral_clock(sc->sc_pid, 1);
at91usart_writereg(sc, US_IDR, -1);
at91usart_writereg(sc, US_RTOR, 12); // 12-bit timeout
at91usart_writereg(sc, US_PDC + PDC_PTCR, PDC_PTCR_TXTDIS | PDC_PTCR_RXTDIS);
at91_intr_establish(sa->sa_pid, IPL_TTY, INTR_HIGH_LEVEL, at91usart_intr, sc);
USART_INIT(sc, 115200U);
#ifdef NOTYET
if (sc->sc_iot == usart_cn_sc.sc_iot
&& sc->sc_hwbase == usart_cn_sc.sc_hwbase) {
usart_cn_sc.sc_attached = 1;
/* Make sure the console is always "hardwired". */
delay(10000); /* wait for output to finish */
SET(sc->sc_hwflags, COM_HW_CONSOLE);
SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
SET(sc->sc_ier, USART_INT_RXRDY);
USARTREG(USART_IER) = USART_INT_RXRDY; // @@@@@
}
#endif // NOTYET
tp = ttymalloc();
tp->t_oproc = at91usart_start;
tp->t_param = at91usart_param;
tp->t_hwiflow = at91usart_hwiflow;
sc->sc_tty = tp;
tty_attach(tp);
#if NOTYET
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
int maj;
/* locate the major number */
maj = cdevsw_lookup_major(&at91usart_cdevsw);
cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev));
aprint_normal("%s: console (maj %u min %u cn_dev %u)\n",
device_xname(sc->sc_dev), maj, device_unit(sc->sc_dev),
cn_tab->cn_dev);
}
#endif /* NOTYET */
sc->sc_si = softint_establish(SOFTINT_SERIAL, at91usart_soft, sc);
#if NRND > 0 && defined(RND_COM)
rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_TTY, 0);
#endif
/* if there are no enable/disable functions, assume the device
is always enabled */
if (!sc->enable)
sc->enabled = 1;
/* XXX configure register */
/* xxx_config(sc) */
SET(sc->sc_hwflags, COM_HW_DEV_OK);
}
static int
at91usart_param(struct tty *tp, struct termios *t)
{
struct at91usart_softc *sc
= device_lookup_private(&at91usart_cd, COMUNIT(tp->t_dev));
int s;
if (COM_ISALIVE(sc) == 0)
return (EIO);
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);
s = spltty();
sc->sc_brgr = (AT91_MSTCLK / 16 + t->c_ospeed / 2) / t->c_ospeed;
/* And copy to tty. */
tp->t_ispeed = 0;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
at91usart_set(sc);
splx(s);
/*
* Update the tty layer's idea of the carrier bit.
* We tell tty the carrier is always on.
*/
(void) (*tp->t_linesw->l_modem)(tp, 1);
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "comparam ");
#endif
/* tell the upper layer about hwflow.. */
if (sc->hwflow)
(*sc->hwflow)(sc, t->c_cflag);
return (0);
}
static int
at91usart_hwiflow(struct tty *tp, int block)
{
if (block) {
/* tty discipline wants to block */
} else {
/* tty discipline wants to unblock */
}
return (0);
}
static __inline void
at91usart_start_tx(struct at91usart_softc *sc)
{
if (!sc->start_tx)
at91usart_writereg(sc, US_PDC + PDC_PTCR, PDC_PTCR_TXTEN);
else
(*sc->start_tx)(sc);
}
static __inline void
at91usart_stop_tx(struct at91usart_softc *sc)
{
if (!sc->stop_tx)
at91usart_writereg(sc, US_PDC + PDC_PTCR, PDC_PTCR_TXTDIS);
else
(*sc->stop_tx)(sc);
}
static __inline void
at91usart_rx_started(struct at91usart_softc *sc)
{
if (sc->rx_started)
(*sc->rx_started)(sc);
}
static __inline void
at91usart_rx_stopped(struct at91usart_softc *sc)
{
if (sc->rx_stopped)
(*sc->rx_stopped)(sc);
}
static __inline void
at91usart_rx_rts_ctl(struct at91usart_softc *sc, int enabled)
{
if (sc->rx_rts_ctl)
(*sc->rx_rts_ctl)(sc, enabled);
}
static void
at91usart_filltx(struct at91usart_softc *sc)
{
struct tty *tp = sc->sc_tty;
int len;
void *dst;
// post write handler
AT91PDC_FIFO_POSTWRITE(sc->sc_iot, sc->sc_ioh, sc->sc_dmat, US_PDC,
&sc->sc_tx_fifo);
// copy more data to fifo:
if (sc->sc_tbc > 0
&& (dst = AT91PDC_FIFO_WRPTR(&sc->sc_tx_fifo, &len)) != NULL) {
// copy data to fifo
if (len > sc->sc_tbc)
len = sc->sc_tbc;
memcpy(dst, sc->sc_tba, len);
sc->sc_tba += len;
if ((sc->sc_tbc -= len) <= 0)
CLR(tp->t_state, TS_BUSY);
// update fifo
AT91PDC_FIFO_WRITTEN(&sc->sc_tx_fifo, len);
// tell tty interface we've sent some bytes
ndflush(&tp->t_outq, len);
}
// start sending data...
if (AT91PDC_FIFO_PREWRITE(sc->sc_iot, sc->sc_ioh, sc->sc_dmat,
US_PDC, &sc->sc_tx_fifo, PDC_BLOCK_SIZE)) {
at91usart_start_tx(sc);
SET(sc->sc_ier, US_CSR_TXEMPTY | US_CSR_ENDTX);
} else {
CLR(sc->sc_ier, US_CSR_ENDTX);
}
}
static void
at91usart_start(struct tty *tp)
{
struct at91usart_softc *sc
= device_lookup_private(&at91usart_cd, COMUNIT(tp->t_dev));
int s;
if (COM_ISALIVE(sc) == 0) {
DPRINTFN(5, ("%s: %s / COM_ISALIVE == 0\n", device_xname(sc->sc_dev), __FUNCTION__));
return;
}
s = spltty();
if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
DPRINTFN(5, ("%s: %s: TS_BUSY || TS_TIMEOUT || TS_TTSTOP\n", device_xname(sc->sc_dev), __FUNCTION__));
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);
sc->sc_tba = tba;
sc->sc_tbc = tbc;
}
SET(tp->t_state, TS_BUSY);
/* Output the first chunk of the contiguous buffer. */
at91usart_filltx(sc);
at91usart_writereg(sc, US_IER, sc->sc_ier);
DPRINTFN(5, ("%s: %s, ier=%08x (csr=%08x)\n", device_xname(sc->sc_dev), __FUNCTION__, sc->sc_ier, at91usart_readreg(sc, US_CSR)));
out:
splx(s);
return;
}
static __inline__ void
at91usart_break(struct at91usart_softc *sc, int onoff)
{
at91usart_writereg(sc, US_CR, onoff ? US_CR_STTBRK : US_CR_STPBRK);
}
static void
at91usart_shutdown(struct at91usart_softc *sc)
{
int s;
s = spltty();
/* turn of dma */
at91usart_writereg(sc, US_PDC + PDC_PTCR, PDC_PTCR_TXTDIS | PDC_PTCR_RXTDIS);
at91usart_writereg(sc, US_PDC + PDC_TNCR, 0);
at91usart_writereg(sc, US_PDC + PDC_TCR, 0);
at91usart_writereg(sc, US_PDC + PDC_RNCR, 0);
at91usart_writereg(sc, US_PDC + PDC_RCR, 0);
/* Turn off interrupts. */
at91usart_writereg(sc, US_IDR, -1);
/* Clear any break condition set with TIOCSBRK. */
at91usart_break(sc, 0);
at91usart_set(sc);
if (sc->disable) {
#ifdef DIAGNOSTIC
if (!sc->enabled)
panic("at91usart_shutdown: not enabled?");
#endif
(*sc->disable)(sc);
sc->enabled = 0;
}
splx(s);
}
int
at91usart_open(dev_t dev, int flag, int mode, struct lwp *l)
{
struct at91usart_softc *sc;
struct tty *tp;
int s;
int error;
sc = device_lookup_private(&at91usart_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;
if (sc->enable) {
if ((*sc->enable)(sc)) {
splx(s);
printf("%s: device enable failed\n",
device_xname(sc->sc_dev));
return (EIO);
}
sc->enabled = 1;
#if 0
/* XXXXXXXXXXXXXXX */
com_config(sc);
#endif
}
/* reset fifos: */
AT91PDC_RESET_FIFO(sc->sc_iot, sc->sc_ioh, sc->sc_dmat, US_PDC, &sc->sc_rx_fifo, 0);
AT91PDC_RESET_FIFO(sc->sc_iot, sc->sc_ioh, sc->sc_dmat, US_PDC, &sc->sc_tx_fifo, 1);
/* reset receive */
at91usart_writereg(sc, US_CR, US_CR_RSTSTA | US_CR_STTTO);
/* Turn on interrupts. */
sc->sc_ier = US_CSR_ENDRX|US_CSR_RXBUFF|US_CSR_TIMEOUT|US_CSR_RXBRK;
at91usart_writereg(sc, US_IER, sc->sc_ier);
/* enable DMA: */
at91usart_writereg(sc, US_PDC + PDC_PTCR, PDC_PTCR_RXTEN);
/*
* 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 = usart_cn_sc.sc_ospeed;
t.c_cflag = usart_cn_sc.sc_cflag;
} 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 at91usart_param() will do something. */
tp->t_ospeed = 0;
(void) at91usart_param(tp, &t);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
ttsetwater(tp);
/* and unblock. */
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
#ifdef COM_DEBUG
if (at91usart_debug)
comstatus(sc, "at91usart_open ");
#endif
}
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.
*/
at91usart_shutdown(sc);
}
return (error);
}
int
at91usart_close(dev_t dev, int flag, int mode, struct lwp *l)
{
struct at91usart_softc *sc = device_lookup_private(&at91usart_cd, COMUNIT(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 (COM_ISALIVE(sc) == 0)
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.
*/
at91usart_shutdown(sc);
}
return (0);
}
int
at91usart_read(dev_t dev, struct uio *uio, int flag)
{
struct at91usart_softc *sc = device_lookup_private(&at91usart_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (COM_ISALIVE(sc) == 0)
return (EIO);
return ((*tp->t_linesw->l_read)(tp, uio, flag));
}
int
at91usart_write(dev_t dev, struct uio *uio, int flag)
{
struct at91usart_softc *sc = device_lookup_private(&at91usart_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (COM_ISALIVE(sc) == 0)
return (EIO);
return ((*tp->t_linesw->l_write)(tp, uio, flag));
}
int
at91usart_poll(dev_t dev, int events, struct lwp *l)
{
struct at91usart_softc *sc = device_lookup_private(&at91usart_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (COM_ISALIVE(sc) == 0)
return (EIO);
return ((*tp->t_linesw->l_poll)(tp, events, l));
}
struct tty *
at91usart_tty(dev_t dev)
{
struct at91usart_softc *sc = device_lookup_private(&at91usart_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return (tp);
}
int
at91usart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct at91usart_softc *sc = device_lookup_private(&at91usart_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
int error;
int s;
if (COM_ISALIVE(sc) == 0)
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 = spltty();
switch (cmd) {
case TIOCSBRK:
at91usart_break(sc, 1);
break;
case TIOCCBRK:
at91usart_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);
}
/*
* Stop output on a line.
*/
void
at91usart_stop(struct tty *tp, int flag)
{
struct at91usart_softc *sc
= device_lookup_private(&at91usart_cd, COMUNIT(tp->t_dev));
int s;
s = spltty();
if (ISSET(tp->t_state, TS_BUSY)) {
/* Stop transmitting at the next chunk. */
sc->sc_tbc = 0;
if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
}
splx(s);
}
#if 0
static u_int
cflag2lcrhi(tcflag_t cflag)
{
u_int32_t mr;
switch (cflag & CSIZE) {
default:
mr = 0x0;
break;
}
#if 0
mr |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0;
mr |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS;
mr |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0;
mr |= LinCtrlHigh_FEN; /* FIFO always enabled */
#endif
mr |= USART_MR_PAR_NONE;
return (mr);
}
#endif
static void
at91usart_set(struct at91usart_softc *sc)
{
at91usart_writereg(sc, US_MR, US_MR_CHRL_8 | US_MR_PAR_NONE | US_MR_NBSTOP_1);
at91usart_writereg(sc, US_BRGR, sc->sc_brgr);
at91usart_writereg(sc, US_CR, US_CR_TXEN | US_CR_RXEN); // @@@ just in case
}
#if NOTYET
int
at91usart_cn_attach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh,
u_int32_t mstclk, int ospeed, tcflag_t cflag)
{
cn_tab = &at91usart_cons;
cn_init_magic(&at91usart_cnm_state);
cn_set_magic("\047\001");
usart_cn_sc.sc_iot = iot;
usart_cn_sc.sc_ioh = ioh;
usart_cn_sc.sc_hwbase = iobase;
usart_cn_sc.sc_ospeed = ospeed;
usart_cn_sc.sc_cflag = cflag;
USART_INIT(mstclk, ospeed);
return (0);
}
void
at91usart_cn_probe(struct consdev *cp)
{
cp->cn_pri = CN_REMOTE;
}
void
at91usart_cn_pollc(dev_t dev, int on)
{
if (on) {
// enable polling mode
USARTREG(US_IDR) = USART_INT_RXRDY;
} else {
// disable polling mode
USARTREG(US_IER) = USART_INT_RXRDY;
}
}
void
at91usart_cn_putc(dev_t dev, int c)
{
int s;
#if 0
bus_space_tag_t iot = usart_cn_sc.sc_iot;
bus_space_handle_t ioh = usart_cn_sc.sc_ioh;
#endif
s = spltty();
USART_PUTC(c);
#ifdef DEBUG
if (c == '\r') {
while((USARTREG(USART_SR) & USART_SR_TXEMPTY) == 0)
;
}
#endif
splx(s);
}
int
at91usart_cn_getc(dev_t dev)
{
int c, sr;
int s;
#if 0
bus_space_tag_t iot = usart_cn_sc.sc_iot;
bus_space_handle_t ioh = usart_cn_sc.sc_ioh;
#endif
s = spltty();
while ((c = USART_PEEKC()) == -1) {
splx(s);
s = spltty();
}
;
sr = USARTREG(USART_SR);
if (ISSET(sr, USART_SR_FRAME) && c == 0) {
USARTREG(USART_CR) = USART_CR_RSTSTA; // reset status bits
c = CNC_BREAK;
}
#ifdef DDB
extern int db_active;
if (!db_active)
#endif
{
int cn_trapped = 0; /* unused */
cn_check_magic(dev, c, at91usart_cnm_state);
}
splx(s);
c &= 0xff;
return (c);
}
#endif /* NOTYET */
inline static void
at91usart_rxsoft(struct at91usart_softc *sc, struct tty *tp, unsigned csr)
{
u_char *start, *get, *end;
int cc;
AT91PDC_FIFO_POSTREAD(sc->sc_iot, sc->sc_ioh, sc->sc_dmat, US_PDC,
&sc->sc_rx_fifo);
if (ISSET(csr, US_CSR_TIMEOUT | US_CSR_RXBRK))
at91usart_rx_stopped(sc);
while ((start = AT91PDC_FIFO_RDPTR(&sc->sc_rx_fifo, &cc)) != NULL) {
int (*rint)(int, struct tty *) = tp->t_linesw->l_rint;
int code;
if (!ISSET(csr, US_CSR_TIMEOUT | US_CSR_RXBRK))
at91usart_rx_started(sc);
for (get = start, end = start + cc; get < end; get++) {
code = *get;
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 = end;
printf("%s: receive missing data!\n",
device_xname(sc->sc_dev));
} else {
/*
* Don't schedule any more receive processing
* until the line discipline tells us there's
* space available (through comhwiflow()).
* Leave the rest of the data in the input
* buffer.
*/
SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
}
break;
}
}
// tell we've read some bytes...
AT91PDC_FIFO_READ(&sc->sc_rx_fifo, get - start);
if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED))
break;
}
// h/w flow control hook:
if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS))
at91usart_rx_rts_ctl(sc, (AT91PDC_FIFO_SPACE(&sc->sc_rx_fifo) > PDC_BLOCK_SIZE * 2));
// write next pointer if USART is ready:
if (AT91PDC_FIFO_PREREAD(sc->sc_iot, sc->sc_ioh, sc->sc_dmat, US_PDC,
&sc->sc_rx_fifo, PDC_BLOCK_SIZE)) {
SET(sc->sc_ier, US_CSR_ENDRX | US_CSR_RXBUFF | US_CSR_TIMEOUT | US_CSR_RXBRK);
} else {
CLR(sc->sc_ier, US_CSR_ENDRX | US_CSR_RXBUFF | US_CSR_TIMEOUT | US_CSR_RXBRK);
}
}
inline static void
at91usart_txsoft(struct at91usart_softc *sc, struct tty *tp)
{
at91usart_filltx(sc);
if (!ISSET(tp->t_state, TS_BUSY))
(*tp->t_linesw->l_start)(tp);
}
static void
at91usart_soft(void* arg)
{
struct at91usart_softc *sc = arg;
int s;
u_int csr;
if (COM_ISALIVE(sc) == 0)
return;
s = spltty();
csr = sc->sc_csr;
while (csr != 0) {
if ((csr &= sc->sc_ier) == 0)
break;
// splx(s);
DPRINTFN(5, ("%s: %s / csr = 0x%08x\n", device_xname(sc->sc_dev), __FUNCTION__, csr));
if (ISSET(csr, US_CSR_ENDRX | US_CSR_RXBUFF | US_CSR_TIMEOUT | US_CSR_RXBRK)) {
/* receive interrupt */
if (ISSET(csr, US_CSR_RXBRK)) {
// break received!
at91usart_writereg(sc, US_CR, US_CR_RSTSTA | US_CR_STTTO);
} else if (ISSET(csr, US_CSR_TIMEOUT)) {
// timeout received
at91usart_writereg(sc, US_CR, US_CR_STTTO);
}
at91usart_rxsoft(sc, sc->sc_tty, csr);
}
if (ISSET(csr, US_CSR_TXEMPTY)) {
at91usart_stop_tx(sc);
CLR(sc->sc_ier, US_CSR_TXEMPTY);
if (AT91PDC_FIFO_EMPTY(&sc->sc_tx_fifo)) {
// everything sent!
if (ISSET(sc->sc_tty->t_state, TS_FLUSH))
CLR(sc->sc_tty->t_state, TS_FLUSH);
}
}
if (ISSET(csr, US_CSR_TXEMPTY | US_CSR_ENDTX)) {
/* transmit interrupt! */
at91usart_txsoft(sc, sc->sc_tty);
}
// s = spltty();
csr = at91usart_readreg(sc, US_CSR);
}
sc->sc_csr = 0;
at91usart_writereg(sc, US_IER, sc->sc_ier); // re-enable interrupts
splx(s);
}
static int
at91usart_intr(void* arg)
{
struct at91usart_softc *sc = arg;
u_int csr, imr;
// get out if interrupts are not enabled
imr = at91usart_readreg(sc, US_IMR);
if (!imr)
return 0;
// get out if pending interrupt is not enabled
csr = at91usart_readreg(sc, US_CSR);
DPRINTFN(6,("%s: csr=%08X imr=%08X\n", device_xname(sc->sc_dev), csr, imr));
if (!ISSET(csr, imr))
return 0;
// ok, we DO have some interrupts to serve! let softint do it
sc->sc_csr = csr;
at91usart_writereg(sc, US_IDR, -1);
/* Wake up the poller. */
softint_schedule(sc->sc_si);
/* we're done for now */
return (1);
}