381388b9c4
This is an amalgam of a patch by Doug Ambrisko to generalize uart_acpi_find_device, imp moving the ACPI table to uart_dev_ns8250.c and advice by jhb to work around a bug in the EPYC 3151 BIOS (the BIOS incorrectly marks the serial ports as disabled) Reviewed by: imp MFC after: 8 weeks Differential Revision: https://reviews.freebsd.org/D16432
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012, Adrian Chadd <adrian@FreeBSD.org>
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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 without
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* modification, are permitted provided that the following conditions
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* 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 copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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*/
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#include "opt_uart.h"
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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 <sys/kernel.h>
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#include <sys/module.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/atheros/ar71xxreg.h>
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#include <mips/atheros/ar71xx_cpudef.h>
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#include <mips/atheros/uart_dev_ar933x.h>
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#ifdef EARLY_PRINTF
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#include <mips/atheros/ar933x_uart.h>
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#endif
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#include "uart_if.h"
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static int uart_ar933x_probe(device_t dev);
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extern struct uart_class uart_ar933x_uart_class;
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static device_method_t uart_ar933x_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, uart_ar933x_probe),
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DEVMETHOD(device_attach, uart_bus_attach),
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DEVMETHOD(device_detach, uart_bus_detach),
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{ 0, 0 }
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};
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static driver_t uart_ar933x_driver = {
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uart_driver_name,
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uart_ar933x_methods,
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sizeof(struct uart_softc),
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};
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extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
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static int
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uart_ar933x_probe(device_t dev)
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{
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struct uart_softc *sc;
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uint64_t freq;
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freq = ar71xx_uart_freq();
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sc = device_get_softc(dev);
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sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
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sc->sc_class = &uart_ar933x_class;
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bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
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sc->sc_sysdev->bas.regshft = 0;
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sc->sc_sysdev->bas.bst = mips_bus_space_generic;
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sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
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sc->sc_bas.regshft = 0;
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sc->sc_bas.bst = mips_bus_space_generic;
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sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
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return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
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}
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/*
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* Assume the UART is setup by the bootloader and just echo that.
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*/
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#if defined(EARLY_PRINTF)
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static void
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ar933x_early_putc(int c)
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{
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int i = 1000;
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/* Wait until FIFO is clear */
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while ((i > 0) && (ATH_READ_REG(AR71XX_UART_ADDR + AR933X_UART_CS_REG) &
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AR933X_UART_CS_TX_BUSY))
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i--;
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/* Write it out */
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ATH_WRITE_REG(AR71XX_UART_ADDR + AR933X_UART_DATA_REG,
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(c & 0xff)| AR933X_UART_DATA_TX_CSR);
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}
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early_putc_t *early_putc = ar933x_early_putc;
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#endif /* EARLY_PRINTF */
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DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0);
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