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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 Ian Lepore
* 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 "opt_platform.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/sysctl.h>
#include <machine/bus.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_cpu_fdt.h>
#include <dev/uart/uart_bus.h>
#include <dev/uart/uart_dev_ns8250.h>
#include <arm/ti/ti_sysc.h>
#include "uart_if.h"
/*
* High-level UART interface.
*/
struct ti8250_softc {
struct ns8250_softc ns8250_base;
/*uint32_t mystuff;*/
};
#define MDR1_REG 8
#define MDR1_MODE_UART 0
#define MDR1_MODE_DISABLE 7
#define SYSCC_REG 15
#define SYSCC_SOFTRESET (1 << 1)
#define SYSS_REG 16
#define SYSS_STATUS_RESETDONE (1 << 0)
static int
ti8250_bus_probe(struct uart_softc *sc)
{
int status;
if ((status = ti_sysc_clock_enable(device_get_parent(sc->sc_dev))) != 0)
return (status);
/*
* Set the hardware to disabled mode, do a full device reset, then set
* it to uart mode. Most devices will be reset-and-disabled already,
* but you never know what a bootloader might have done.
*/
uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
continue;
uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
status = ns8250_bus_probe(sc);
if (status == 0)
device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
return (status);
}
static kobj_method_t ti8250_methods[] = {
KOBJMETHOD(uart_probe, ti8250_bus_probe),
KOBJMETHOD(uart_attach, ns8250_bus_attach),
KOBJMETHOD(uart_detach, ns8250_bus_detach),
KOBJMETHOD(uart_flush, ns8250_bus_flush),
KOBJMETHOD(uart_getsig, ns8250_bus_getsig),
KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl),
KOBJMETHOD(uart_ipend, ns8250_bus_ipend),
KOBJMETHOD(uart_param, ns8250_bus_param),
KOBJMETHOD(uart_receive, ns8250_bus_receive),
KOBJMETHOD(uart_setsig, ns8250_bus_setsig),
KOBJMETHOD(uart_transmit, ns8250_bus_transmit),
KOBJMETHOD_END
};
static struct uart_class uart_ti8250_class = {
"ti8250",
ti8250_methods,
sizeof(struct ti8250_softc),
.uc_ops = &uart_ns8250_ops,
.uc_range = 0x88,
.uc_rclk = 48000000,
.uc_rshift = 2
};
static struct ofw_compat_data compat_data[] = {
{"ti,ns16550", (uintptr_t)&uart_ti8250_class},
{"ti,omap3-uart", (uintptr_t)&uart_ti8250_class},
{"ti,omap4-uart", (uintptr_t)&uart_ti8250_class},
{NULL, (uintptr_t)NULL},
};
UART_FDT_CLASS_AND_DEVICE(compat_data);
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