/* $NetBSD: hd64461uart.c,v 1.32 2023/12/20 14:50:02 thorpej Exp $ */

/* $NetBSD: hd64461uart.c,v 1.32 2023/12/20 14:50:02 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: hd64461uart.c,v 1.32 2023/12/20 14:50:02 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/termios.h>
#include <dev/cons.h>
#include <sys/conf.h>
#include <sys/bus.h>

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

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

#include <machine/debug.h>

#include <hpcsh/dev/hd64461/hd64461var.h>
#include <hpcsh/dev/hd64461/hd64461reg.h>
#include <hpcsh/dev/hd64461/hd64461intcreg.h>
#include <hpcsh/dev/hd64461/hd64461uartvar.h>
#include <hpcsh/dev/hd64461/hd64461uartreg.h>

STATIC struct hd64461uart_chip {
struct hpcsh_bus_space __tag_body;
bus_space_tag_t io_tag;
int console;
} hd64461uart_chip;

struct hd64461uart_softc {
struct com_softc sc_com;

struct hd64461uart_chip *sc_chip;
enum hd64461_module_id sc_module_id;
};

/* boot console */
void hd64461uartcnprobe(struct consdev *);
void hd64461uartcninit(struct consdev *);

STATIC int hd64461uart_match(device_t, cfdata_t , void *);
STATIC void hd64461uart_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(hd64461uart, sizeof(struct hd64461uart_softc),
hd64461uart_match, hd64461uart_attach, NULL, NULL);

STATIC void hd64461uart_init(void);

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

static void
hd64461uart_init_regs(struct com_regs *regs, bus_space_tag_t tag,
bus_space_handle_t hdl, bus_addr_t addr)
{

com_init_regs_stride(regs, tag, hdl, addr, 1);
}

void
hd64461uartcnprobe(struct consdev *cp)
{
extern const 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
hd64461uartcninit(struct consdev *cp)
{
struct com_regs regs;

hd64461uart_init();

hd64461uart_init_regs(&regs, hd64461uart_chip.io_tag, 0x0, 0x0);
comcnattach1(&regs, COMCN_SPEED, COM_FREQ, COM_TYPE_NORMAL, CONMODE);

hd64461uart_chip.console = 1;
/* Don't stop to suply AFECK */
if (platid_match(&platid, &platid_mask_MACH_HITACHI_PERSONA))
use_afeck = 1;
}

#ifdef KGDB
int
hd64461uart_kgdb_init(void)
{
struct com_regs regs;

if (strcmp(kgdb_devname, "hd64461uart") != 0)
return 1;

if (hd64461uart_chip.console)
return 1; /* can't share with console */

hd64461uart_init();

hd64461uart_init_regs(&regs, hd64461uart_chip.io_tag, 0x0, 0x0);
if (com_kgdb_attach1(&regs,
kgdb_rate, COM_FREQ, COM_TYPE_NORMAL, CONMODE) != 0) {
printf("%s: KGDB console open failed.\n", __func__);
return 1;
}

if (platid_match(&platid, &platid_mask_MACH_HITACHI_PERSONA))
use_afeck = 1;
return 0;
}
#endif /* KGDB */

STATIC int
hd64461uart_match(device_t parent, cfdata_t cf, void *aux)
{
struct hd64461_attach_args *ha = aux;

return ha->ha_module_id == HD64461_MODULE_UART;
}

STATIC void
hd64461uart_attach(device_t parent, device_t self, void *aux)
{
struct hd64461_attach_args *ha = aux;
struct hd64461uart_softc *sc = device_private(self);
struct com_softc *csc = &sc->sc_com;
uint16_t r16, or16;
bus_space_handle_t ioh;

csc->sc_dev = self;
sc->sc_chip = &hd64461uart_chip;

sc->sc_module_id = ha->ha_module_id;

if (!sc->sc_chip->console)
hd64461uart_init();

bus_space_map(sc->sc_chip->io_tag, 0x0, 8, 0, &ioh);
csc->sc_frequency = COM_FREQ;
hd64461uart_init_regs(&csc->sc_regs, sc->sc_chip->io_tag, ioh, 0x0);

/* switch port to UART */

/* supply clock */
r16 = or16 = hd64461_reg_read_2(HD64461_SYSSTBCR_REG16);
r16 &= ~HD64461_SYSSTBCR_SURTSD;
if (platid_match(&platid, &platid_mask_MACH_HITACHI_PERSONA))
r16 &= ~(HD64461_SYSSTBCR_SAFECKE_IST |
HD64461_SYSSTBCR_SAFECKE_OST);
hd64461_reg_write_2(HD64461_SYSSTBCR_REG16, r16);

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

/* restore old clock */
hd64461_reg_write_2(HD64461_SYSSTBCR_REG16, or16);
return;
}

com_attach_subr(csc);

hd6446x_intr_establish(HD64461_INTC_UART, IST_LEVEL, IPL_TTY,
comintr, csc);
}

STATIC void
hd64461uart_init(void)
{

if (hd64461uart_chip.io_tag)
return;

hd64461uart_chip.io_tag = bus_space_create(
&hd64461uart_chip.__tag_body, "HD64461 UART I/O",
HD64461_UART_REGBASE, 0); /* no extent */
}