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/* $NetBSD: uart.c,v 1.2 2007/03/23 20:05:47 dogcow Exp $ */
/*-
* Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko.
* Copyright (c) 2007 Oleksandr Tymoshenko.
* 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>
__FBSDID("$FreeBSD: release/9.1.0/sys/mips/adm5120/uart_dev_adm5120.c 202175 2010-01-12 21:36:08Z imp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <machine/bus.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_bus.h>
#include <mips/adm5120/uart_dev_adm5120.h>
#include "uart_if.h"
/*
* Low-level UART interface.
*/
static int adm5120_uart_probe(struct uart_bas *bas);
static void adm5120_uart_init(struct uart_bas *bas, int, int, int, int);
static void adm5120_uart_term(struct uart_bas *bas);
static void adm5120_uart_putc(struct uart_bas *bas, int);
static int adm5120_uart_rxready(struct uart_bas *bas);
static int adm5120_uart_getc(struct uart_bas *bas, struct mtx *);
static struct uart_ops uart_adm5120_uart_ops = {
.probe = adm5120_uart_probe,
.init = adm5120_uart_init,
.term = adm5120_uart_term,
.putc = adm5120_uart_putc,
.rxready = adm5120_uart_rxready,
.getc = adm5120_uart_getc,
};
static int
adm5120_uart_probe(struct uart_bas *bas)
{
return (0);
}
static void
adm5120_uart_init(struct uart_bas *bas, int baudrate, int databits,
int stopbits, int parity)
{
/* TODO: Set parameters for uart, meanwhile stick with 115200N1 */
}
static void
adm5120_uart_term(struct uart_bas *bas)
{
}
static void
adm5120_uart_putc(struct uart_bas *bas, int c)
{
char chr;
chr = c;
while (uart_getreg(bas, UART_FR_REG) & UART_FR_TX_FIFO_FULL)
;
uart_setreg(bas, UART_DR_REG, c);
while (uart_getreg(bas, UART_FR_REG) & UART_FR_BUSY)
;
uart_barrier(bas);
}
static int
adm5120_uart_rxready(struct uart_bas *bas)
{
if (uart_getreg(bas, UART_FR_REG) & UART_FR_RX_FIFO_EMPTY)
return (0);
return (1);
}
static int
adm5120_uart_getc(struct uart_bas *bas, struct mtx *hwmtx)
{
int c;
uart_lock(hwmtx);
while (uart_getreg(bas, UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) {
uart_unlock(hwmtx);
DELAY(10);
uart_lock(hwmtx);
}
c = uart_getreg(bas, UART_DR_REG);
uart_unlock(hwmtx);
return (c);
}
/*
* High-level UART interface.
*/
struct adm5120_uart_softc {
struct uart_softc base;
};
static int adm5120_uart_bus_attach(struct uart_softc *);
static int adm5120_uart_bus_detach(struct uart_softc *);
static int adm5120_uart_bus_flush(struct uart_softc *, int);
static int adm5120_uart_bus_getsig(struct uart_softc *);
static int adm5120_uart_bus_ioctl(struct uart_softc *, int, intptr_t);
static int adm5120_uart_bus_ipend(struct uart_softc *);
static int adm5120_uart_bus_param(struct uart_softc *, int, int, int, int);
static int adm5120_uart_bus_probe(struct uart_softc *);
static int adm5120_uart_bus_receive(struct uart_softc *);
static int adm5120_uart_bus_setsig(struct uart_softc *, int);
static int adm5120_uart_bus_transmit(struct uart_softc *);
static kobj_method_t adm5120_uart_methods[] = {
KOBJMETHOD(uart_attach, adm5120_uart_bus_attach),
KOBJMETHOD(uart_detach, adm5120_uart_bus_detach),
KOBJMETHOD(uart_flush, adm5120_uart_bus_flush),
KOBJMETHOD(uart_getsig, adm5120_uart_bus_getsig),
KOBJMETHOD(uart_ioctl, adm5120_uart_bus_ioctl),
KOBJMETHOD(uart_ipend, adm5120_uart_bus_ipend),
KOBJMETHOD(uart_param, adm5120_uart_bus_param),
KOBJMETHOD(uart_probe, adm5120_uart_bus_probe),
KOBJMETHOD(uart_receive, adm5120_uart_bus_receive),
KOBJMETHOD(uart_setsig, adm5120_uart_bus_setsig),
KOBJMETHOD(uart_transmit, adm5120_uart_bus_transmit),
{ 0, 0 }
};
struct uart_class uart_adm5120_uart_class = {
"adm5120",
adm5120_uart_methods,
sizeof(struct adm5120_uart_softc),
.uc_ops = &uart_adm5120_uart_ops,
.uc_range = 1, /* use hinted range */
.uc_rclk = 62500000
};
#define SIGCHG(c, i, s, d) \
if (c) { \
i |= (i & s) ? s : s | d; \
} else { \
i = (i & s) ? (i & ~s) | d : i; \
}
/*
* Disable TX interrupt. uart should be locked
*/
static __inline void
adm5120_uart_disable_txintr(struct uart_softc *sc)
{
uint8_t cr;
cr = uart_getreg(&sc->sc_bas, UART_CR_REG);
cr &= ~UART_CR_TX_INT_EN;
uart_setreg(&sc->sc_bas, UART_CR_REG, cr);
}
/*
* Enable TX interrupt. uart should be locked
*/
static __inline void
adm5120_uart_enable_txintr(struct uart_softc *sc)
{
uint8_t cr;
cr = uart_getreg(&sc->sc_bas, UART_CR_REG);
cr |= UART_CR_TX_INT_EN;
uart_setreg(&sc->sc_bas, UART_CR_REG, cr);
}
static int
adm5120_uart_bus_attach(struct uart_softc *sc)
{
struct uart_bas *bas;
struct uart_devinfo *di;
bas = &sc->sc_bas;
if (sc->sc_sysdev != NULL) {
di = sc->sc_sysdev;
/* TODO: set parameters from di */
} else {
/* TODO: set parameters 115200, 8N1 */
}
sc->sc_rxfifosz = 16;
sc->sc_txfifosz = 16;
(void)adm5120_uart_bus_getsig(sc);
#if 1
/* Enable FIFO */
uart_setreg(bas, UART_LCR_H_REG,
uart_getreg(bas, UART_LCR_H_REG) | UART_LCR_H_FEN);
#endif
/* Enable interrupts */
uart_setreg(bas, UART_CR_REG,
UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN|
UART_CR_MODEM_STATUS_INT_EN);
return (0);
}
static int
adm5120_uart_bus_detach(struct uart_softc *sc)
{
return (0);
}
static int
adm5120_uart_bus_flush(struct uart_softc *sc, int what)
{
return (0);
}
static int
adm5120_uart_bus_getsig(struct uart_softc *sc)
{
uint32_t new, old, sig;
uint8_t bes;
do {
old = sc->sc_hwsig;
sig = old;
uart_lock(sc->sc_hwmtx);
bes = uart_getreg(&sc->sc_bas, UART_FR_REG);
uart_unlock(sc->sc_hwmtx);
SIGCHG(bes & UART_FR_CTS, sig, SER_CTS, SER_DCTS);
SIGCHG(bes & UART_FR_DCD, sig, SER_DCD, SER_DDCD);
SIGCHG(bes & UART_FR_DSR, sig, SER_DSR, SER_DDSR);
new = sig & ~SER_MASK_DELTA;
} while (!atomic_cmpset_32(&sc->sc_hwsig, old, new));
return (sig);
}
static int
adm5120_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
{
struct uart_bas *bas;
int baudrate, divisor, error;
bas = &sc->sc_bas;
error = 0;
uart_lock(sc->sc_hwmtx);
switch (request) {
case UART_IOCTL_BREAK:
/* TODO: Send BREAK */
break;
case UART_IOCTL_BAUD:
divisor = uart_getreg(bas, UART_LCR_M_REG);
divisor = (divisor << 8) |
uart_getreg(bas, UART_LCR_L_REG);
baudrate = bas->rclk / 2 / (divisor + 2);
*(int*)data = baudrate;
break;
default:
error = EINVAL;
break;
}
uart_unlock(sc->sc_hwmtx);
return (error);
}
static int
adm5120_uart_bus_ipend(struct uart_softc *sc)
{
struct uart_bas *bas;
int ipend;
uint8_t ir, fr, rsr;
bas = &sc->sc_bas;
ipend = 0;
uart_lock(sc->sc_hwmtx);
ir = uart_getreg(&sc->sc_bas, UART_IR_REG);
fr = uart_getreg(&sc->sc_bas, UART_FR_REG);
rsr = uart_getreg(&sc->sc_bas, UART_RSR_REG);
if (ir & UART_IR_RX_INT)
ipend |= SER_INT_RXREADY;
if (ir & UART_IR_RX_TIMEOUT_INT)
ipend |= SER_INT_RXREADY;
if (ir & UART_IR_MODEM_STATUS_INT)
ipend |= SER_INT_SIGCHG;
if (rsr & UART_RSR_BE)
ipend |= SER_INT_BREAK;
if (rsr & UART_RSR_OE)
ipend |= SER_INT_OVERRUN;
if (fr & UART_FR_TX_FIFO_EMPTY) {
if (ir & UART_IR_TX_INT) {
adm5120_uart_disable_txintr(sc);
ipend |= SER_INT_TXIDLE;
}
}
if (ipend)
uart_setreg(bas, UART_IR_REG, ir | UART_IR_UICR);
uart_unlock(sc->sc_hwmtx);
return (ipend);
}
static int
adm5120_uart_bus_param(struct uart_softc *sc, int baudrate, int databits,
int stopbits, int parity)
{
/* TODO: Set parameters for uart, meanwhile stick with 115200 8N1 */
return (0);
}
static int
adm5120_uart_bus_probe(struct uart_softc *sc)
{
char buf[80];
int error;
char ch;
error = adm5120_uart_probe(&sc->sc_bas);
if (error)
return (error);
ch = sc->sc_bas.chan + 'A';
snprintf(buf, sizeof(buf), "adm5120_uart, channel %c", ch);
device_set_desc_copy(sc->sc_dev, buf);
return (0);
}
static int
adm5120_uart_bus_receive(struct uart_softc *sc)
{
struct uart_bas *bas;
int xc;
uint8_t fr, rsr;
bas = &sc->sc_bas;
uart_lock(sc->sc_hwmtx);
fr = uart_getreg(bas, UART_FR_REG);
while (!(fr & UART_FR_RX_FIFO_EMPTY)) {
if (uart_rx_full(sc)) {
sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN;
break;
}
xc = 0;
rsr = uart_getreg(bas, UART_RSR_REG);
if (rsr & UART_RSR_FE)
xc |= UART_STAT_FRAMERR;
if (rsr & UART_RSR_PE)
xc |= UART_STAT_PARERR;
if (rsr & UART_RSR_OE)
xc |= UART_STAT_OVERRUN;
xc |= uart_getreg(bas, UART_DR_REG);
uart_barrier(bas);
uart_rx_put(sc, xc);
if (rsr & (UART_RSR_FE | UART_RSR_PE | UART_RSR_OE)) {
uart_setreg(bas, UART_ECR_REG, UART_ECR_RSR);
uart_barrier(bas);
}
fr = uart_getreg(bas, UART_FR_REG);
}
/* Discard everything left in the Rx FIFO. */
while (!(fr & UART_FR_RX_FIFO_EMPTY)) {
( void)uart_getreg(bas, UART_DR_REG);
uart_barrier(bas);
rsr = uart_getreg(bas, UART_RSR_REG);
if (rsr & (UART_RSR_FE | UART_RSR_PE | UART_RSR_OE)) {
uart_setreg(bas, UART_ECR_REG, UART_ECR_RSR);
uart_barrier(bas);
}
fr = uart_getreg(bas, UART_FR_REG);
}
uart_unlock(sc->sc_hwmtx);
return (0);
}
static int
adm5120_uart_bus_setsig(struct uart_softc *sc, int sig)
{
/* TODO: implement (?) */
return (0);
}
static int
adm5120_uart_bus_transmit(struct uart_softc *sc)
{
struct uart_bas *bas;
bas = &sc->sc_bas;
uart_lock(sc->sc_hwmtx);
sc->sc_txbusy = 1;
for (int i = 0; i < sc->sc_txdatasz; i++) {
if (uart_getreg(bas, UART_FR_REG) & UART_FR_TX_FIFO_FULL)
break;
uart_setreg(bas, UART_DR_REG, sc->sc_txbuf[i]);
}
/* Enable TX interrupt */
adm5120_uart_enable_txintr(sc);
uart_unlock(sc->sc_hwmtx);
return (0);
}