/*	$NetBSD: exynos_sscom.c,v 1.5 2014/04/27 20:22:46 reinoud Exp $ */

/*
 * Copyright (c) 2014 Reinoud Zandijk
 * Copyright (c) 2002, 2003 Fujitsu Component Limited
 * Copyright (c) 2002, 2003 Genetec Corporation
 * 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.
 * 3. Neither the name of The Fujitsu Component Limited nor the name of
 *    Genetec corporation may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
 * CORPORATION ``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 FUJITSU COMPONENT LIMITED OR GENETEC
 * CORPORATION 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: exynos_sscom.c,v 1.5 2014/04/27 20:22:46 reinoud Exp $");

#include "opt_sscom.h"
#include "opt_ddb.h"
#include "opt_kgdb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/types.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/timepps.h>
#include <sys/vnode.h>

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

#include <arm/samsung/sscom_reg.h>
#include <arm/samsung/sscom_var.h>
#include <arm/samsung/exynos_reg.h>
#include <arm/samsung/exynos_var.h>
#include <sys/termios.h>

static int sscom_match(device_t, cfdata_t, void *);
static void sscom_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(exynos_sscom, sizeof(struct sscom_softc), sscom_match,
    sscom_attach, NULL, NULL);

static int
sscom_match(device_t parent, cfdata_t cf, void *aux)
{
	struct exyo_attach_args *exyoaa = aux;
	int port = exyoaa->exyo_loc.loc_port;

	return port >= 0 && port <= 4;
}

static void
exynos_unmask_interrupts(struct sscom_softc *sc, int intbits)
{
	int psw = disable_interrupts(IF32_bits);
	uint32_t val;

	val = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSCOM_UINTM);
	val &= ~intbits;
	bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSCOM_UINTM, val);

	restore_interrupts(psw);
}

static void
exynos_mask_interrupts(struct sscom_softc *sc, int intbits)
{
	int psw = disable_interrupts(IF32_bits);
	uint32_t val;

	val = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSCOM_UINTM);
	val |= intbits;
	bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSCOM_UINTM, val);

	restore_interrupts(psw);
}

static void
exynos_change_txrx_interrupts(struct sscom_softc *sc, bool unmask_p,
    u_int flags)
{
	int intbits = 0;
	if (flags & SSCOM_HW_RXINT)
		intbits |= UINT_RXD;
	if (flags & SSCOM_HW_TXINT)
		intbits |= UINT_TXD;
	if (unmask_p) {
		exynos_unmask_interrupts(sc, intbits);
	} else {
		exynos_mask_interrupts(sc, intbits);
	}
}

static void
exynos_clear_interrupts(struct sscom_softc *sc, u_int flags)
{
	uint32_t val = 0;

	if (flags & SSCOM_HW_RXINT)
		val |= UINT_RXD;
	if (flags & SSCOM_HW_TXINT)
		val |= UINT_TXD;
	bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSCOM_UINTP, val);
}

static void
sscom_attach(device_t parent, device_t self, void *aux)
{
	struct sscom_softc *sc = device_private(self);
	struct exyo_attach_args *exyo = aux;
	int unit = exyo->exyo_loc.loc_port;

	/* debug */
//	bus_addr_t iobase = exyo->exyo_loc.loc_offset;
//	aprint_normal( ": UART%d addr=%lx", unit, iobase );

	sc->sc_dev = self;
	sc->sc_iot = exyo->exyo_core_bst;
	sc->sc_unit = unit;
	sc->sc_frequency = EXYNOS_UART_FREQ;

	sc->sc_change_txrx_interrupts = exynos_change_txrx_interrupts;
	sc->sc_clear_interrupts = exynos_clear_interrupts;

	/* not used here, but do initialise */
	sc->sc_rx_irqno = 0;
	sc->sc_tx_irqno = 0;

	if (!sscom_is_console(sc->sc_iot, unit, &sc->sc_ioh)
	    && bus_space_subregion(sc->sc_iot, exyo->exyo_core_bsh,
		    exyo->exyo_loc.loc_offset, SSCOM_SIZE, &sc->sc_ioh)) {
		printf( ": failed to map registers\n" );
		return;
	}

	printf("\n");

	void *ih = intr_establish(exyo->exyo_loc.loc_intr, IPL_SCHED,
	    IST_LEVEL, sscomintr, sc);
	if (ih != NULL) {
		aprint_normal_dev(self, "interrupting at irq %d\n",
		    exyo->exyo_loc.loc_intr);
	}
	sscom_attach_subr(sc);
}


#if 0
int
exynos_sscom_cnattach(bus_space_tag_t iot, int unit, int rate,
    int frequency, tcflag_t cflag)
{
	return sscom_cnattach(iot, exynos_uart_config + unit,
	    rate, frequency, cflag);
}

#ifdef KGDB
int
exynos_sscom_kgdb_attach(bus_space_tag_t iot, int unit, int rate,
    int frequency, tcflag_t cflag)
{
	return sscom_kgdb_attach(iot, exynos_uart_config + unit,
	    rate, frequency, cflag);
}
#endif /* KGDB */
#endif