NetBSD-5.0.2/sys/arch/mips/adm5120/dev/uart.c
/* $NetBSD: uart.c,v 1.5 2008/06/11 23:55:20 cegger Exp $ */
/*-
* Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko.
* 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 names of the authors may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS
* 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: uart.c,v 1.5 2008/06/11 23:55:20 cegger Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/kauth.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <mips/adm5120/include/adm5120var.h>
#include <mips/adm5120/include/adm5120_obiovar.h>
#include <dev/cons.h>
#include <mips/adm5120/dev/uart.h>
#define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o))
#define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v))
cons_decl(uart_);
extern struct consdev *cn_tab; /* physical console device info */
dev_type_open(uart_open);
dev_type_open(uart_close);
dev_type_read(uart_read);
dev_type_write(uart_write);
dev_type_ioctl(uart_ioctl);
dev_type_tty(uart_tty);
dev_type_poll(uart_poll);
dev_type_stop(uart_stop);
const struct cdevsw uart_cdevsw = {
uart_open, uart_close, uart_read, uart_write, uart_ioctl,
uart_stop, uart_tty, uart_poll, nommap, ttykqfilter, D_TTY
};
struct consdev uartcons = {
NULL, NULL, uart_cngetc, uart_cnputc, uart_cnpollc, NULL, NULL, NULL,
NODEV, CN_NORMAL
};
struct uart_softc {
struct device sc_dev;
struct tty *sc_tty;
bus_space_tag_t sc_st;
bus_space_handle_t sc_ioh;
void *sc_ih;
};
extern struct cfdriver uart_cd;
static int uart_consattached;
static int uart_probe (struct device *, struct cfdata *, void *);
static void uart_attach (struct device *, struct device *, void *);
void uart_start(struct tty *);
int uart_param(struct tty *, struct termios *);
int uart_intr(void *);
CFATTACH_DECL(uart, sizeof(struct uart_softc),
uart_probe, uart_attach, NULL, NULL);
static int
uart_probe(struct device *parent, struct cfdata *cf, void *aux)
{
struct obio_attach_args *aa = aux;
if (strcmp(aa->oba_name, cf->cf_name) == 0)
return (1);
return (0);
}
static void
uart_attach(struct device *parent, struct device *self, void *aux)
{
struct obio_attach_args *oba = aux;
struct uart_softc *sc = (struct uart_softc *)self;
struct tty *tp;
int maj, minor;
sc->sc_st = oba->oba_st;
if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0,
&sc->sc_ioh)) {
printf("%s: unable to map device\n", sc->sc_dev.dv_xname);
return;
}
/* Establish the interrupt. */
sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc);
if (sc->sc_ih == NULL) {
printf("%s: unable to establish interrupt\n",
sc->sc_dev.dv_xname);
return;
}
REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN);
maj = cdevsw_lookup_major(&uart_cdevsw);
minor = sc->sc_dev.dv_unit;
tp = ttymalloc();
tp->t_oproc = uart_start;
tp->t_param = uart_param;
sc->sc_tty = tp;
tp->t_dev = makedev(maj, minor);
tty_attach(tp);
if (minor == 0 && uart_consattached) {
/* attach as console*/
cn_tab->cn_dev = tp->t_dev;
printf(" console");
}
printf("\n");
}
int
uart_cnattach(void)
{
cn_tab = &uartcons;
uart_consattached = 1;
return (0);
}
void
uart_cnputc(dev_t dev, int c)
{
char chr;
chr = c;
while ((*((volatile unsigned long *)0xb2600018)) & 0x20) ;
(*((volatile unsigned long *)0xb2600000)) = c;
}
int
uart_cngetc(dev_t dev)
{
while ((*((volatile unsigned long *)0xb2600018)) & 0x10) ;
return (*((volatile unsigned long *)0xb2600000)) & 0xff;
}
void
uart_cnpollc(dev_t dev, int on)
{
}
/*
* TTY device
*/
int
uart_open(dev_t dev, int flag, int mode, struct lwp *l)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
struct tty *tp = sc->sc_tty;
int s, error = 0;
s = spltty();
tp->t_dev = dev;
if ((tp->t_state & TS_ISOPEN) == 0) {
tp->t_state |= TS_CARR_ON;
ttychars(tp);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = 115200;
ttsetwater(tp);
} else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN,
tp) != 0) {
splx(s);
return (EBUSY);
}
splx(s);
error = (*tp->t_linesw->l_open)(dev, tp);
return (error);
}
int
uart_close(dev_t dev, int flag, int mode, struct lwp *l)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
struct tty *tp = sc->sc_tty;
(*tp->t_linesw->l_close)(tp, flag);
ttyclose(tp);
return (0);
}
int
uart_read(dev_t dev, struct uio *uio, int flag)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
struct tty *tp = sc->sc_tty;
return ((*tp->t_linesw->l_read)(tp, uio, flag));
}
int
uart_write(dev_t dev, struct uio *uio, int flag)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
struct tty *tp = sc->sc_tty;
return ((*tp->t_linesw->l_write)(tp, uio, flag));
}
int
uart_poll(dev_t dev, int events, struct lwp *l)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
struct tty *tp = sc->sc_tty;
return ((*tp->t_linesw->l_poll)(tp, events, l));
}
int
uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
struct tty *tp = sc->sc_tty;
int error;
error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return (error);
return (ttioctl(tp, cmd, data, flag, l));
}
int
uart_param(struct tty *tp, struct termios *t)
{
return (0);
}
struct tty*
uart_tty(dev_t dev)
{
struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
return sc->sc_tty;
}
void
uart_start(struct tty *tp)
{
int s,i,cnt;
s = spltty();
if (tp->t_state & (TS_TTSTOP | TS_BUSY))
goto out;
ttypull(tp);
tp->t_state |= TS_BUSY;
while (tp->t_outq.c_cc != 0) {
cnt = ndqb(&tp->t_outq, 0);
for (i=0; i<cnt; i++)
uart_cnputc(0,tp->t_outq.c_cf[i]);
ndflush(&tp->t_outq, cnt);
}
tp->t_state &= ~TS_BUSY;
out:
splx(s);
}
void
uart_stop(struct tty *tp, int flag)
{
int s;
s = spltty();
if (tp->t_state & TS_BUSY)
if ((tp->t_state & TS_TTSTOP) == 0)
tp->t_state |= TS_FLUSH;
splx(s);
}
int
uart_intr(void *v)
{
struct uart_softc *sc = v;
struct tty *tp = sc->sc_tty;
int c, l_r;
if (REG_READ(UART_RSR_REG) & UART_RSR_BE) {
REG_WRITE(UART_ECR_REG, UART_ECR_RSR);
console_debugger();
}
while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) {
c = REG_READ(UART_DR_REG) & 0xff;
if (tp->t_state & TS_ISOPEN)
l_r = (*tp->t_linesw->l_rint)(c, tp);
}
return 0;
}