/*      $NetBSD: hd64465uart.c,v 1.21 2023/12/20 14:50:03 thorpej Exp $ */

/*-
 * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
 * 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 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: hd64465uart.c,v 1.21 2023/12/20 14:50:03 thorpej Exp $");

#include "opt_kgdb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/device.h>
#include <sys/kgdb.h>
#include <sys/bus.h>

#include <sys/termios.h>
#include <dev/cons.h>
#include <sys/conf.h>

#include <machine/intr.h>
#include <machine/console.h>

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

#include <machine/debug.h>

#include <hpcsh/dev/hd64465/hd64465var.h>
#include <hpcsh/dev/hd64465/hd64465intcreg.h>
#include <hpcsh/dev/hd64465/hd64465uartvar.h>
#include <hpcsh/dev/hd64465/hd64465uartreg.h>

STATIC struct hd64465uart_chip {
        struct hpcsh_bus_space __tag_body;
        bus_space_tag_t io_tag;
        int console;
} hd64465uart_chip;

struct hd64465uart_softc {
        struct com_softc sc_com;

        struct hd64465uart_chip *sc_chip;
        enum hd64465_module_id sc_module_id;
};

/* boot console */
void hd64465uartcnprobe(struct consdev *);
void hd64465uartcninit(struct consdev *);

STATIC int hd64465uart_match(device_t, cfdata_t , void *);
STATIC void hd64465uart_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(hd64465uart, sizeof(struct hd64465uart_softc),
    hd64465uart_match, hd64465uart_attach, NULL, NULL);

STATIC void hd64465uart_init(void);
STATIC uint8_t hd64465uart_read_1(void *, bus_space_handle_t, bus_size_t);
STATIC void hd64465uart_write_1(void *, bus_space_handle_t, bus_size_t,
    uint8_t);

#define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
#ifndef COMCN_SPEED
#define COMCN_SPEED     19200
#endif

void
hd64465uartcnprobe(struct consdev *cp)
{
        extern struct cdevsw com_cdevsw;
        int maj;

        /* locate the major number */
        maj = cdevsw_lookup_major(&com_cdevsw);

        /* Initialize required fields. */
        cp->cn_dev = makedev(maj, 0);
        cp->cn_pri = CN_NORMAL;
}

void
hd64465uartcninit(struct consdev *cp)
{

        hd64465uart_init();

        comcnattach(hd64465uart_chip.io_tag, 0x0, COMCN_SPEED, COM_FREQ,
            COM_TYPE_NORMAL, CONMODE);  

        hd64465uart_chip.console = 1;
}

#ifdef KGDB
int
hd64465uart_kgdb_init(void)
{

        if (strcmp(kgdb_devname, "hd64465uart") != 0)
                return (1);

        if (hd64465uart_chip.console)
                return (1);     /* can't share with console */

        hd64465uart_init();

        if (com_kgdb_attach(hd64465uart_chip.io_tag, 0x0, kgdb_rate,
            COM_FREQ, COM_TYPE_NORMAL, CONMODE) != 0) {
                printf("%s: KGDB console open failed.\n", __func__);
                return (1);
        }

        return (0);
}
#endif /* KGDB */

int
hd64465uart_match(device_t parent, cfdata_t cf, void *aux)
{
        struct hd64465_attach_args *ha = aux;

        return (ha->ha_module_id == HD64465_MODULE_UART);
}

void
hd64465uart_attach(device_t parent, device_t self, void *aux)
{
        struct hd64465_attach_args *ha = aux;
        struct hd64465uart_softc *sc = device_private(self);
        struct com_softc *csc = &sc->sc_com;
        bus_space_handle_t ioh;

        csc->sc_dev = self;
        sc->sc_chip = &hd64465uart_chip;

        sc->sc_module_id = ha->ha_module_id;

        if (!sc->sc_chip->console)
                hd64465uart_init();

        bus_space_map(sc->sc_chip->io_tag, 0, 8, 0, &ioh);
        com_init_regs(&csc->sc_regs, sc->sc_chip->io_tag, ioh, 0);
        csc->sc_frequency = COM_FREQ;

        /* supply clock XXX notyet */

        /* sanity check */
        if (!com_probe_subr(&csc->sc_regs)) {
                aprint_error(": device problem. don't attach.\n");

                /* stop clock XXX notyet */
                return;
        }

        com_attach_subr(csc);

        /* register interrupt handler */
        hd64465_intr_establish(HD64465_UART, IST_LEVEL, IPL_TTY,
            comintr, self);
}

void
hd64465uart_init(void)
{

        if (hd64465uart_chip.io_tag)
                return;

        hd64465uart_chip.io_tag = bus_space_create(
                &hd64465uart_chip.__tag_body, "HD64465 UART I/O",
                0xb0008000, 0); /* no extent */

        /* override bus_space_read_1, bus_space_write_1 */
        hd64465uart_chip.io_tag->hbs_r_1 = hd64465uart_read_1;
        hd64465uart_chip.io_tag->hbs_w_1 = hd64465uart_write_1;
}

uint8_t
hd64465uart_read_1(void *t, bus_space_handle_t h, bus_size_t ofs)
{

        return *(volatile uint8_t *)(h + (ofs << 1));
}

void
hd64465uart_write_1(void *t, bus_space_handle_t h, bus_size_t ofs,
    uint8_t val)
{

        *(volatile uint8_t *)(h + (ofs << 1)) = val;    
}