freebsd-dev/sys/mips/atheros/uart_bus_ar933x.c
Matt Macy 381388b9c4 add snps IP uart support / genaralize UART
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
2018-08-19 21:10:21 +00:00

118 lines
3.5 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012, Adrian Chadd <adrian@FreeBSD.org>
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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
*/
#include "opt_uart.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_bus.h>
#include <mips/atheros/ar71xxreg.h>
#include <mips/atheros/ar71xx_cpudef.h>
#include <mips/atheros/uart_dev_ar933x.h>
#ifdef EARLY_PRINTF
#include <mips/atheros/ar933x_uart.h>
#endif
#include "uart_if.h"
static int uart_ar933x_probe(device_t dev);
extern struct uart_class uart_ar933x_uart_class;
static device_method_t uart_ar933x_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, uart_ar933x_probe),
DEVMETHOD(device_attach, uart_bus_attach),
DEVMETHOD(device_detach, uart_bus_detach),
{ 0, 0 }
};
static driver_t uart_ar933x_driver = {
uart_driver_name,
uart_ar933x_methods,
sizeof(struct uart_softc),
};
extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
static int
uart_ar933x_probe(device_t dev)
{
struct uart_softc *sc;
uint64_t freq;
freq = ar71xx_uart_freq();
sc = device_get_softc(dev);
sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
sc->sc_class = &uart_ar933x_class;
bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
sc->sc_sysdev->bas.regshft = 0;
sc->sc_sysdev->bas.bst = mips_bus_space_generic;
sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
sc->sc_bas.regshft = 0;
sc->sc_bas.bst = mips_bus_space_generic;
sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
}
/*
* Assume the UART is setup by the bootloader and just echo that.
*/
#if defined(EARLY_PRINTF)
static void
ar933x_early_putc(int c)
{
int i = 1000;
/* Wait until FIFO is clear */
while ((i > 0) && (ATH_READ_REG(AR71XX_UART_ADDR + AR933X_UART_CS_REG) &
AR933X_UART_CS_TX_BUSY))
i--;
/* Write it out */
ATH_WRITE_REG(AR71XX_UART_ADDR + AR933X_UART_DATA_REG,
(c & 0xff)| AR933X_UART_DATA_TX_CSR);
}
early_putc_t *early_putc = ar933x_early_putc;
#endif /* EARLY_PRINTF */
DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0);