/*      $OpenBSD: com_leioc.c,v 1.2 2017/02/19 10:18:41 visa Exp $      */

/*
 * Copyright (c) 2016 Visa Hankala
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/termios.h>
#include <sys/tty.h>

#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/loongson3.h>

#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>

#include <loongson/dev/leiocreg.h>
#include <loongson/dev/leiocvar.h>

#define UART_FREQ       33000000
#define UART_RATE       115200

int     com_leioc_match(struct device *, void *, void *);
void    com_leioc_attach(struct device *, struct device *, void *);
int     com_leioc_intr(void *);

const struct cfattach com_leioc_ca = {
        sizeof(struct com_softc), com_leioc_match, com_leioc_attach
};

extern struct cfdriver com_cd;

int
com_leioc_match(struct device *parent, void *match, void *aux)
{
        struct leioc_attach_args *laa = aux;

        if (strcmp(laa->laa_name, com_cd.cd_name) == 0)
                return 1;

        return 0;
}

void
com_leioc_attach(struct device *parent, struct device *self, void *aux)
{
        struct leioc_attach_args *laa = aux;
        struct com_softc *sc = (void *)self;
        int console = 0;

        if (comconsiot == &leioc_io_space_tag && comconsaddr == laa->laa_base)
                console = 1;

        sc->sc_hwflags = 0;
        sc->sc_swflags = 0;
        sc->sc_frequency = UART_FREQ;

        if (!console || comconsattached) {
                sc->sc_iot = &leioc_io_space_tag;
                sc->sc_iobase = laa->laa_base;
                if (bus_space_map(sc->sc_iot, sc->sc_iobase, COM_NPORTS, 0,
                    &sc->sc_ioh)) {
                        printf(": could not map UART registers\n");
                        return;
                }
        } else {
                /* Reuse the early console settings. */
                sc->sc_iot = comconsiot;
                sc->sc_iobase = comconsaddr;
                if (comcnattach(sc->sc_iot, sc->sc_iobase, comconsrate,
                    sc->sc_frequency, comconscflag))
                        panic("could not set up serial console");
                sc->sc_ioh = comconsioh;
        }

        com_attach_subr(sc);

        loongson3_intr_establish(LS3_IRQ_LPC, IPL_TTY, com_leioc_intr, sc,
            sc->sc_dev.dv_xname);
}

int
com_leioc_intr(void *arg)
{
        comintr(arg);

        /*
         * Always return non-zero to prevent console clutter about spurious
         * interrupts. comstart() enables the transmitter holding register
         * empty interrupt before adding data to the FIFO, which can trigger
         * a premature interrupt on the primary CPU in a multiprocessor system.
         */
        return 1;
}

void
leioc_cons_setup(void)
{
        comconsiot = &leioc_io_space_tag;
        comconsaddr = LEIOC_UART0_BASE;
        comconsfreq = UART_FREQ;
        comconsrate = UART_RATE;
        comconscflag = (TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) |
            CS8 | CLOCAL;
}