/*      $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;
}