/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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/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(uart_txbusy,         ns8250_bus_txbusy),
        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);