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294ef64a17
console, it calls the grab functions. These functions should turn off the RX interrupts, and any others that interfere. This makes mountroot prompt work again. If there's more generalized need other than prompting, many of these routines should be expanded to do those new things. Reviewed by: bde (with reservations)
480 lines
11 KiB
C
480 lines
11 KiB
C
/* $NetBSD: uart.c,v 1.2 2007/03/23 20:05:47 dogcow Exp $ */
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/*-
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* Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko.
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* Copyright (c) 2007 Oleksandr Tymoshenko.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <machine/bus.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_bus.h>
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#include <mips/adm5120/uart_dev_adm5120.h>
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#include "uart_if.h"
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/*
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* Low-level UART interface.
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*/
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static int adm5120_uart_probe(struct uart_bas *bas);
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static void adm5120_uart_init(struct uart_bas *bas, int, int, int, int);
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static void adm5120_uart_term(struct uart_bas *bas);
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static void adm5120_uart_putc(struct uart_bas *bas, int);
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static int adm5120_uart_rxready(struct uart_bas *bas);
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static int adm5120_uart_getc(struct uart_bas *bas, struct mtx *);
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static struct uart_ops uart_adm5120_uart_ops = {
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.probe = adm5120_uart_probe,
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.init = adm5120_uart_init,
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.term = adm5120_uart_term,
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.putc = adm5120_uart_putc,
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.rxready = adm5120_uart_rxready,
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.getc = adm5120_uart_getc,
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};
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static int
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adm5120_uart_probe(struct uart_bas *bas)
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{
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return (0);
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}
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static void
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adm5120_uart_init(struct uart_bas *bas, int baudrate, int databits,
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int stopbits, int parity)
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{
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/* TODO: Set parameters for uart, meanwhile stick with 115200N1 */
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}
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static void
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adm5120_uart_term(struct uart_bas *bas)
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{
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}
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static void
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adm5120_uart_putc(struct uart_bas *bas, int c)
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{
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char chr;
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chr = c;
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while (uart_getreg(bas, UART_FR_REG) & UART_FR_TX_FIFO_FULL)
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;
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uart_setreg(bas, UART_DR_REG, c);
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while (uart_getreg(bas, UART_FR_REG) & UART_FR_BUSY)
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;
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uart_barrier(bas);
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}
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static int
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adm5120_uart_rxready(struct uart_bas *bas)
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{
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if (uart_getreg(bas, UART_FR_REG) & UART_FR_RX_FIFO_EMPTY)
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return (0);
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return (1);
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}
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static int
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adm5120_uart_getc(struct uart_bas *bas, struct mtx *hwmtx)
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{
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int c;
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uart_lock(hwmtx);
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while (uart_getreg(bas, UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) {
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uart_unlock(hwmtx);
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DELAY(10);
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uart_lock(hwmtx);
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}
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c = uart_getreg(bas, UART_DR_REG);
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uart_unlock(hwmtx);
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return (c);
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}
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/*
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* High-level UART interface.
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*/
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struct adm5120_uart_softc {
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struct uart_softc base;
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};
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static int adm5120_uart_bus_attach(struct uart_softc *);
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static int adm5120_uart_bus_detach(struct uart_softc *);
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static int adm5120_uart_bus_flush(struct uart_softc *, int);
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static int adm5120_uart_bus_getsig(struct uart_softc *);
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static int adm5120_uart_bus_ioctl(struct uart_softc *, int, intptr_t);
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static int adm5120_uart_bus_ipend(struct uart_softc *);
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static int adm5120_uart_bus_param(struct uart_softc *, int, int, int, int);
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static int adm5120_uart_bus_probe(struct uart_softc *);
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static int adm5120_uart_bus_receive(struct uart_softc *);
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static int adm5120_uart_bus_setsig(struct uart_softc *, int);
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static int adm5120_uart_bus_transmit(struct uart_softc *);
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static void adm5120_uart_bus_grab(struct uart_softc *);
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static void adm5120_uart_bus_ungrab(struct uart_softc *);
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static kobj_method_t adm5120_uart_methods[] = {
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KOBJMETHOD(uart_attach, adm5120_uart_bus_attach),
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KOBJMETHOD(uart_detach, adm5120_uart_bus_detach),
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KOBJMETHOD(uart_flush, adm5120_uart_bus_flush),
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KOBJMETHOD(uart_getsig, adm5120_uart_bus_getsig),
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KOBJMETHOD(uart_ioctl, adm5120_uart_bus_ioctl),
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KOBJMETHOD(uart_ipend, adm5120_uart_bus_ipend),
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KOBJMETHOD(uart_param, adm5120_uart_bus_param),
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KOBJMETHOD(uart_probe, adm5120_uart_bus_probe),
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KOBJMETHOD(uart_receive, adm5120_uart_bus_receive),
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KOBJMETHOD(uart_setsig, adm5120_uart_bus_setsig),
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KOBJMETHOD(uart_transmit, adm5120_uart_bus_transmit),
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KOBJMETHOD(uart_grab, adm5120_uart_bus_grab),
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KOBJMETHOD(uart_ungrab, adm5120_uart_bus_ungrab),
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{ 0, 0 }
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};
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struct uart_class uart_adm5120_uart_class = {
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"adm5120",
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adm5120_uart_methods,
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sizeof(struct adm5120_uart_softc),
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.uc_ops = &uart_adm5120_uart_ops,
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.uc_range = 1, /* use hinted range */
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.uc_rclk = 62500000
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};
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#define SIGCHG(c, i, s, d) \
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if (c) { \
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i |= (i & s) ? s : s | d; \
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} else { \
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i = (i & s) ? (i & ~s) | d : i; \
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}
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/*
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* Disable TX interrupt. uart should be locked
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*/
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static __inline void
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adm5120_uart_disable_txintr(struct uart_softc *sc)
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{
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uint8_t cr;
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cr = uart_getreg(&sc->sc_bas, UART_CR_REG);
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cr &= ~UART_CR_TX_INT_EN;
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uart_setreg(&sc->sc_bas, UART_CR_REG, cr);
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}
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/*
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* Enable TX interrupt. uart should be locked
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*/
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static __inline void
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adm5120_uart_enable_txintr(struct uart_softc *sc)
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{
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uint8_t cr;
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cr = uart_getreg(&sc->sc_bas, UART_CR_REG);
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cr |= UART_CR_TX_INT_EN;
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uart_setreg(&sc->sc_bas, UART_CR_REG, cr);
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}
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static int
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adm5120_uart_bus_attach(struct uart_softc *sc)
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{
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struct uart_bas *bas;
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struct uart_devinfo *di;
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bas = &sc->sc_bas;
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if (sc->sc_sysdev != NULL) {
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di = sc->sc_sysdev;
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/* TODO: set parameters from di */
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} else {
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/* TODO: set parameters 115200, 8N1 */
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}
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(void)adm5120_uart_bus_getsig(sc);
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#if 1
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/* Enable FIFO */
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uart_setreg(bas, UART_LCR_H_REG,
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uart_getreg(bas, UART_LCR_H_REG) | UART_LCR_H_FEN);
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#endif
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/* Enable interrupts */
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uart_setreg(bas, UART_CR_REG,
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UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN|
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UART_CR_MODEM_STATUS_INT_EN);
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return (0);
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}
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static int
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adm5120_uart_bus_detach(struct uart_softc *sc)
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{
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return (0);
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}
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static int
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adm5120_uart_bus_flush(struct uart_softc *sc, int what)
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{
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return (0);
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}
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static int
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adm5120_uart_bus_getsig(struct uart_softc *sc)
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{
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uint32_t new, old, sig;
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uint8_t bes;
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do {
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old = sc->sc_hwsig;
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sig = old;
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uart_lock(sc->sc_hwmtx);
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bes = uart_getreg(&sc->sc_bas, UART_FR_REG);
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uart_unlock(sc->sc_hwmtx);
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SIGCHG(bes & UART_FR_CTS, sig, SER_CTS, SER_DCTS);
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SIGCHG(bes & UART_FR_DCD, sig, SER_DCD, SER_DDCD);
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SIGCHG(bes & UART_FR_DSR, sig, SER_DSR, SER_DDSR);
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new = sig & ~SER_MASK_DELTA;
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} while (!atomic_cmpset_32(&sc->sc_hwsig, old, new));
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return (sig);
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}
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static int
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adm5120_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
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{
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struct uart_bas *bas;
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int baudrate, divisor, error;
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bas = &sc->sc_bas;
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error = 0;
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uart_lock(sc->sc_hwmtx);
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switch (request) {
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case UART_IOCTL_BREAK:
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/* TODO: Send BREAK */
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break;
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case UART_IOCTL_BAUD:
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divisor = uart_getreg(bas, UART_LCR_M_REG);
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divisor = (divisor << 8) |
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uart_getreg(bas, UART_LCR_L_REG);
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baudrate = bas->rclk / 2 / (divisor + 2);
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*(int*)data = baudrate;
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break;
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default:
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error = EINVAL;
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break;
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}
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uart_unlock(sc->sc_hwmtx);
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return (error);
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}
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static int
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adm5120_uart_bus_ipend(struct uart_softc *sc)
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{
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struct uart_bas *bas;
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int ipend;
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uint8_t ir, fr, rsr;
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bas = &sc->sc_bas;
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ipend = 0;
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uart_lock(sc->sc_hwmtx);
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ir = uart_getreg(&sc->sc_bas, UART_IR_REG);
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fr = uart_getreg(&sc->sc_bas, UART_FR_REG);
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rsr = uart_getreg(&sc->sc_bas, UART_RSR_REG);
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if (ir & UART_IR_RX_INT)
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ipend |= SER_INT_RXREADY;
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if (ir & UART_IR_RX_TIMEOUT_INT)
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ipend |= SER_INT_RXREADY;
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if (ir & UART_IR_MODEM_STATUS_INT)
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ipend |= SER_INT_SIGCHG;
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if (rsr & UART_RSR_BE)
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ipend |= SER_INT_BREAK;
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if (rsr & UART_RSR_OE)
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ipend |= SER_INT_OVERRUN;
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if (fr & UART_FR_TX_FIFO_EMPTY) {
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if (ir & UART_IR_TX_INT) {
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adm5120_uart_disable_txintr(sc);
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ipend |= SER_INT_TXIDLE;
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}
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}
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if (ipend)
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uart_setreg(bas, UART_IR_REG, ir | UART_IR_UICR);
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uart_unlock(sc->sc_hwmtx);
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return (ipend);
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}
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static int
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adm5120_uart_bus_param(struct uart_softc *sc, int baudrate, int databits,
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int stopbits, int parity)
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{
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/* TODO: Set parameters for uart, meanwhile stick with 115200 8N1 */
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return (0);
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}
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static int
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adm5120_uart_bus_probe(struct uart_softc *sc)
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{
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char buf[80];
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int error;
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char ch;
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error = adm5120_uart_probe(&sc->sc_bas);
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if (error)
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return (error);
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sc->sc_rxfifosz = 16;
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sc->sc_txfifosz = 16;
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ch = sc->sc_bas.chan + 'A';
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snprintf(buf, sizeof(buf), "adm5120_uart, channel %c", ch);
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device_set_desc_copy(sc->sc_dev, buf);
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return (0);
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}
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static int
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adm5120_uart_bus_receive(struct uart_softc *sc)
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{
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struct uart_bas *bas;
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int xc;
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uint8_t fr, rsr;
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bas = &sc->sc_bas;
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uart_lock(sc->sc_hwmtx);
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fr = uart_getreg(bas, UART_FR_REG);
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while (!(fr & UART_FR_RX_FIFO_EMPTY)) {
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if (uart_rx_full(sc)) {
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sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN;
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break;
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}
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xc = 0;
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rsr = uart_getreg(bas, UART_RSR_REG);
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if (rsr & UART_RSR_FE)
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xc |= UART_STAT_FRAMERR;
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if (rsr & UART_RSR_PE)
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xc |= UART_STAT_PARERR;
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if (rsr & UART_RSR_OE)
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xc |= UART_STAT_OVERRUN;
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xc |= uart_getreg(bas, UART_DR_REG);
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uart_barrier(bas);
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uart_rx_put(sc, xc);
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if (rsr & (UART_RSR_FE | UART_RSR_PE | UART_RSR_OE)) {
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uart_setreg(bas, UART_ECR_REG, UART_ECR_RSR);
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uart_barrier(bas);
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}
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fr = uart_getreg(bas, UART_FR_REG);
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}
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/* Discard everything left in the Rx FIFO. */
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while (!(fr & UART_FR_RX_FIFO_EMPTY)) {
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( void)uart_getreg(bas, UART_DR_REG);
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uart_barrier(bas);
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rsr = uart_getreg(bas, UART_RSR_REG);
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if (rsr & (UART_RSR_FE | UART_RSR_PE | UART_RSR_OE)) {
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uart_setreg(bas, UART_ECR_REG, UART_ECR_RSR);
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uart_barrier(bas);
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}
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fr = uart_getreg(bas, UART_FR_REG);
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}
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uart_unlock(sc->sc_hwmtx);
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return (0);
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}
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static int
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adm5120_uart_bus_setsig(struct uart_softc *sc, int sig)
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{
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/* TODO: implement (?) */
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return (0);
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}
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static int
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adm5120_uart_bus_transmit(struct uart_softc *sc)
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{
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struct uart_bas *bas;
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bas = &sc->sc_bas;
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uart_lock(sc->sc_hwmtx);
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sc->sc_txbusy = 1;
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for (int i = 0; i < sc->sc_txdatasz; i++) {
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if (uart_getreg(bas, UART_FR_REG) & UART_FR_TX_FIFO_FULL)
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break;
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uart_setreg(bas, UART_DR_REG, sc->sc_txbuf[i]);
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}
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/* Enable TX interrupt */
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adm5120_uart_enable_txintr(sc);
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uart_unlock(sc->sc_hwmtx);
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return (0);
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}
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static void
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adm5120_uart_bus_grab(struct uart_softc *sc)
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{
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/* Enable interrupts - no RX_INT or RX_TIMEOUT */
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uart_lock(sc->sc_hwmtx);
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uart_setreg(&sc->sc_bas, UART_CR_REG,
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UART_CR_PORT_EN | UART_CR_MODEM_STATUS_INT_EN);
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uart_unlock(sc->sc_hwmtx);
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}
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static void
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adm5120_uart_bus_ungrab(struct uart_softc *sc)
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{
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/* Enable interrupts */
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uart_lock(sc->sc_hwmtx);
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uart_setreg(&sc->sc_bas, UART_CR_REG,
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UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN|
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UART_CR_MODEM_STATUS_INT_EN);
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uart_unlock(sc->sc_hwmtx);
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}
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