/* $NetBSD: com_eumb.c,v 1.12 2021/03/25 05:35:50 rin Exp $ */

/*-
 * Copyright (c) 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Tohru Nishimura.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: com_eumb.c,v 1.12 2021/03/25 05:35:50 rin Exp $");

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

#include <sys/bus.h>
#include <machine/intr.h>

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

#include <sandpoint/sandpoint/eumbvar.h>
#include "locators.h"

static int  com_eumb_match(device_t, cfdata_t , void *);
static void com_eumb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(com_eumb, sizeof(struct com_softc),
    com_eumb_match, com_eumb_attach, NULL, NULL);

static int found;
static struct com_regs cnregs;

/*
 * There are two different UART configurations: single 4-wire UART
 * and dual 2-wire.  The DCR register selects one of the two operating
 * modes.  A certain group of NAS boxes uses the 2nd UART as system
 * console while using the 1st to communicate with the power management
 * satellite processor. The "unit" locator helps to reverse the two.
 * Default is a single 4-wire UART as console.
 */
int
com_eumb_match(device_t parent, cfdata_t cf, void *aux)
{
        struct eumb_attach_args *eaa = aux;
        int unit = eaa->eumb_unit;

        if (unit == EUMBCF_UNIT_DEFAULT && found == 0)
                return 1;
        if (unit == 0 || unit == 1)
                return 1;
        return 0;
}

void
com_eumb_attach(device_t parent, device_t self, void *aux)
{
        struct com_softc *sc = device_private(self);
        struct eumb_attach_args *eaa = aux;
        int comaddr, epicirq;
        bus_space_handle_t ioh;
        extern u_long ticks_per_sec;

        sc->sc_dev = self;
        found = 1;

        comaddr = (eaa->eumb_unit == 1) ? 0x4600 : 0x4500;
        if (com_is_console(eaa->eumb_bt, comaddr, &ioh)) {
                cnregs.cr_ioh = ioh;
                sc->sc_regs = cnregs;
        } else {
                bus_space_map(eaa->eumb_bt, comaddr, COM_NPORTS, 0, &ioh);
                com_init_regs(&sc->sc_regs, eaa->eumb_bt, ioh, comaddr);
        }
        sc->sc_frequency = 4 * ticks_per_sec;
        epicirq = (eaa->eumb_unit == 1) ? 25 : 24;

        /*
         * XXX
         * At least KuroBox Classic and HG seem to have a hardware bug, by
         * which ETXRDY interrupt is sometimes, say, once per few hours,
         * lost; output stalls until next input arrives. In order to work
         * around this problem, push TX queue manually by low-rate.
         */
#define COM_EUMB_FLAG_BROKEN_ETXRDY     __BIT(0)
        if (device_cfdata(self)->cf_flags & COM_EUMB_FLAG_BROKEN_ETXRDY) {
                SET(sc->sc_hwflags, COM_HW_BROKEN_ETXRDY);
                sc->sc_poll_ticks = 10 * hz;    /* once per 10 sec */
        }

        com_attach_subr(sc);

        intr_establish_xname(epicirq + I8259_ICU, IST_LEVEL, IPL_SERIAL,
            comintr, sc, device_xname(self));
        aprint_normal_dev(self, "interrupting at irq %d\n",
            epicirq + I8259_ICU);
}

int
eumbcnattach(bus_space_tag_t tag,
    int conaddr, int conspeed, int confreq, int contype, int conmode)
{
        static int attached = 0;
        bus_space_handle_t dummy_bsh; /* XXX see com.c:comcnattach() */

        memset(&dummy_bsh, 0, sizeof(dummy_bsh));

        if (attached)
                return 0;
        attached = 1;

        cnregs.cr_iot = tag;
        cnregs.cr_iobase = conaddr;
        cnregs.cr_nports = COM_NPORTS;
        com_init_regs(&cnregs, tag, dummy_bsh, conaddr);
        return comcnattach1(&cnregs, conspeed, confreq, contype, conmode);
}