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freebsd/sys/arm/sa11x0/uart_dev_sa1110.c

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/*
* Copyright (c) 2003 Marcel Moolenaar
* 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/tty.h>
#include <machine/bus.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_bus.h>
#include <arm/sa11x0/uart_dev_sa1110.h>
#include "uart_if.h"
#define DEFAULT_RCLK 3686400
extern int got_mmu;
/*
* Low-level UART interface.
*/
static int sa1110_probe(struct uart_bas *bas);
static void sa1110_init(struct uart_bas *bas, int, int, int, int);
static void sa1110_term(struct uart_bas *bas);
static void sa1110_putc(struct uart_bas *bas, int);
static int sa1110_poll(struct uart_bas *bas);
static int sa1110_getc(struct uart_bas *bas);
int did_mmu = 0;
extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
struct uart_ops uart_sa1110_ops = {
.probe = sa1110_probe,
.init = sa1110_init,
.term = sa1110_term,
.putc = sa1110_putc,
.poll = sa1110_poll,
.getc = sa1110_getc,
};
static int
sa1110_probe(struct uart_bas *bas)
{
return (0);
}
static void
sa1110_addr_change(struct uart_bas *bas)
{
bas->bsh = 0xd000d000;
did_mmu = 1;
}
static void
sa1110_init(struct uart_bas *bas, int baudrate, int databits, int stopbits,
int parity)
{
int brd;
/* XXX: sigh. */
if (!did_mmu && got_mmu)
sa1110_addr_change(bas);
if (bas->rclk == 0)
bas->rclk = DEFAULT_RCLK;
while (uart_getreg(bas, SACOM_SR1) & SR1_TBY);
uart_setreg(bas, SACOM_CR3, 0);
brd = SACOMSPEED(baudrate);
uart_setreg(bas, SACOM_CR1, brd >> 8);
uart_setreg(bas, SACOM_CR2, brd & 0xff);
uart_setreg(bas, SACOM_CR3, CR3_RXE | CR3_TXE);
}
static void
sa1110_term(struct uart_bas *bas)
{
/* XXX */
}
static void
sa1110_putc(struct uart_bas *bas, int c)
{
/* XXX: sigh. */
if (!did_mmu && got_mmu)
sa1110_addr_change(bas);
while (!uart_getreg(bas, SACOM_SR1) & SR1_TNF);
uart_setreg(bas, SACOM_DR, c);
}
static int
sa1110_poll(struct uart_bas *bas)
{
/* XXX: sigh. */
if (!did_mmu && got_mmu)
sa1110_addr_change(bas);
if (!(uart_getreg(bas, SACOM_SR1) & SR1_RNE))
return (-1);
return (uart_getreg(bas, SACOM_DR) & 0xff);
}
static int
sa1110_getc(struct uart_bas *bas)
{
int c;
/* XXX: sigh. */
if (!did_mmu && got_mmu)
sa1110_addr_change(bas);
while (!(uart_getreg(bas, SACOM_SR1) & SR1_RNE)) {
u_int32_t sr0;
sr0 = uart_getreg(bas, SACOM_SR0);
if (ISSET(sr0, SR0_RBB))
uart_setreg(bas, SACOM_SR0, SR0_RBB);
if (ISSET(sr0, SR0_REB))
uart_setreg(bas, SACOM_SR0, SR0_REB);
}
c = uart_getreg(bas, SACOM_DR);
c &= 0xff;
return (c);
}
static int sa1110_bus_probe(struct uart_softc *sc);
static int sa1110_bus_attach(struct uart_softc *sc);
static int sa1110_bus_flush(struct uart_softc *, int);
static int sa1110_bus_getsig(struct uart_softc *);
static int sa1110_bus_ioctl(struct uart_softc *, int, intptr_t);
static int sa1110_bus_ipend(struct uart_softc *);
static int sa1110_bus_param(struct uart_softc *, int, int, int, int);
static int sa1110_bus_receive(struct uart_softc *);
static int sa1110_bus_setsig(struct uart_softc *, int);
static int sa1110_bus_transmit(struct uart_softc *);
static kobj_method_t sa1110_methods[] = {
KOBJMETHOD(uart_probe, sa1110_bus_probe),
KOBJMETHOD(uart_attach, sa1110_bus_attach),
KOBJMETHOD(uart_flush, sa1110_bus_flush),
KOBJMETHOD(uart_getsig, sa1110_bus_getsig),
KOBJMETHOD(uart_ioctl, sa1110_bus_ioctl),
KOBJMETHOD(uart_ipend, sa1110_bus_ipend),
KOBJMETHOD(uart_param, sa1110_bus_param),
KOBJMETHOD(uart_receive, sa1110_bus_receive),
KOBJMETHOD(uart_setsig, sa1110_bus_setsig),
KOBJMETHOD(uart_transmit, sa1110_bus_transmit),
{0, 0 }
};
int
sa1110_bus_probe(struct uart_softc *sc)
{
return (0);
}
static int
sa1110_bus_attach(struct uart_softc *sc)
{
bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
sc->sc_txfifosz = 3;
sc->sc_rxfifosz = 1;
sc->sc_hwiflow = 0;
uart_setreg(&sc->sc_bas, SACOM_CR3, CR3_RXE | CR3_TXE | CR3_RIE | CR3_TIE);
return (0);
}
static int
sa1110_bus_transmit(struct uart_softc *sc)
{
int i;
#if 0
int sr = uart_getreg(&sc->sc_bas, SACOM_SR0);
while (!(uart_getreg(&sc->sc_bas, SACOM_CR3) & CR3_TIE))
uart_setreg(&sc->sc_bas, SACOM_CR3,
uart_getreg(&sc->sc_bas, SACOM_CR3) | CR3_TIE);
#endif
sc->sc_txbusy = 1;
uart_setreg(&sc->sc_bas, SACOM_CR3, uart_getreg(&sc->sc_bas, SACOM_CR3)
| CR3_TIE);
for (i = 0; i < sc->sc_txdatasz; i++) {
while (!uart_getreg(&sc->sc_bas, SACOM_SR1) & SR1_TNF);
uart_setreg(&sc->sc_bas, SACOM_DR, sc->sc_txbuf[i]);
uart_barrier(&sc->sc_bas);
}
#if 0
sr = uart_getreg(&sc->sc_bas, SACOM_SR0);
#endif
return (0);
}
static int
sa1110_bus_setsig(struct uart_softc *sc, int sig)
{
return (0);
}
static int
sa1110_bus_receive(struct uart_softc *sc)
{
#if 0
while (!(uart_getreg(&sc->sc_bas, SACOM_SR1) & SR1_RNE)) {
u_int32_t sr0;
sr0 = uart_getreg(&sc->sc_bas, SACOM_SR0);
if (ISSET(sr0, SR0_RBB))
uart_setreg(&sc->sc_bas, SACOM_SR0, SR0_RBB);
if (ISSET(sr0, SR0_REB))
uart_setreg(&sc->sc_bas, SACOM_SR0, SR0_REB);
}
#endif
uart_setreg(&sc->sc_bas, SACOM_CR3, uart_getreg(&sc->sc_bas, SACOM_CR3)
| CR3_RIE);
uart_rx_put(sc, uart_getreg(&sc->sc_bas, SACOM_DR));
return (0);
}
static int
sa1110_bus_param(struct uart_softc *sc, int baudrate, int databits,
int stopbits, int parity)
{
int brd;
if (baudrate > 0) {
brd = SACOMSPEED(baudrate);
uart_setreg(&sc->sc_bas, SACOM_CR1, brd >> 8);
uart_setreg(&sc->sc_bas, SACOM_CR2, brd & 0xff);
}
return (0);
}
static int
sa1110_bus_ipend(struct uart_softc *sc)
{
int sr = uart_getreg(&sc->sc_bas, SACOM_SR0);
int ipend = 0;
int mask = CR3_RIE | CR3_TIE;
if (sr & 1) {
if (uart_getreg(&sc->sc_bas, SACOM_CR3) & CR3_TIE)
ipend |= UART_IPEND_TXIDLE;
mask &= ~CR3_TIE;
}
if (sr & 4) {
if (uart_getreg(&sc->sc_bas, SACOM_CR3) & CR3_RIE)
ipend |= UART_IPEND_RXREADY;
mask &= ~CR3_RIE;
}
uart_setreg(&sc->sc_bas, SACOM_CR3, CR3_RXE | mask);
return (ipend);
}
static int
sa1110_bus_flush(struct uart_softc *sc, int what)
{
return (0);
}
static int
sa1110_bus_getsig(struct uart_softc *sc)
{
return (0);
}
static int
sa1110_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
{
return (EINVAL);
}
struct uart_class uart_sa1110_class = {
"sa1110 class",
sa1110_methods,
1,
.uc_range = 8,
.uc_rclk = 3686400
};
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