/*      $NetBSD: lpc_com.c,v 1.5 2018/12/08 17:46:09 thorpej Exp $      */

/* adapted from:
 *      NetBSD: gemini_com.c,v 1.1 2008/10/24 04:23:18 matt Exp
 */

/*
 * Based on arch/arm/xscale/pxa2x0_com.c
 *
 * Copyright 2003 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Steve C. Woodford for Wasabi Systems, Inc.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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: lpc_com.c,v 1.5 2018/12/08 17:46:09 thorpej Exp $");

#include "opt_com.h"
#include "locators.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/termios.h>
#include <sys/callout.h>
#include <sys/kernel.h>

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

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

#include <arm/gemini/gemini_obiovar.h>
#include <arm/gemini/gemini_lpchcvar.h>
#include <arm/gemini/gemini_lpcvar.h>
#include <arm/gemini/gemini_reg.h>

#include <arm/gemini/lpc_com.h>

typedef struct lpc_com_softc {
        struct com_softc        sc_com;
        bus_addr_t              sc_addr;
        bus_size_t              sc_size;
        int                     sc_intr;
        bus_space_tag_t         sc_iot;
        bus_space_handle_t      sc_ioh;
        struct callout          sc_callout;
} lpc_com_softc_t;

static int      lpc_com_match(device_t, cfdata_t , void *);
static void     lpc_com_attach(device_t, device_t, void *);
static int      lpc_com_intr(void *);
static void     lpc_com_time(void *);

CFATTACH_DECL_NEW(lpc_com, sizeof(struct lpc_com_softc),
    lpc_com_match, lpc_com_attach, NULL, NULL);

static int
lpc_com_match(device_t parent, cfdata_t cf, void *aux)
{
        struct gemini_lpc_attach_args *lpc = aux;
        lpctag_t lpctag;
        bus_space_tag_t iot;
        bus_space_handle_t ioh;
        bus_addr_t iobase;
        int rv;

        if (lpc->lpc_addr == LPCCF_LDN_DEFAULT
        ||  lpc->lpc_addr == LPCCF_ADDR_DEFAULT)
                panic("lpc_com must have ldn and addr"
                        " in config.");

        if ((lpc->lpc_intr != LPCCF_INTR_DEFAULT) && (lpc->lpc_intr > 0xff))
                panic("lpc_com: bad intr %d", lpc->lpc_intr);

        if (lpc->lpc_size == LPCCF_SIZE_DEFAULT)
                lpc->lpc_size = IT8712F_UART_SIZE;

        iobase = lpc->lpc_base + lpc->lpc_addr;
        if (com_is_console(lpc->lpc_iot, iobase, NULL))
                return 1;

        lpctag = lpc->lpc_tag;

        lpc_pnp_enter(lpctag);

        /* Activate */
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x30, 0x01);

        /* Set address */
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x60,
                (lpc->lpc_addr % 0xff00) >> 8);
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x61,
                (lpc->lpc_addr % 0x00ff) >> 0);

        /* Set Interrupt Level */
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x70, lpc->lpc_intr);

        /* Set Special Configuration Regs */
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf0, 0x00);
#if 0
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x50);
#else
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x58);        /* LO */
#endif
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf2, 0x00);
        lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf3, 0x7f);

        lpc_pnp_exit(lpctag);

        iot = lpc->lpc_iot;
        if (bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh))
                return 0;

        rv = comprobe1(iot, ioh);

        bus_space_unmap(iot, ioh, lpc->lpc_size);

        return rv;
}

static void
lpc_com_attach(device_t parent, device_t self, void *aux)
{
        struct lpc_com_softc *sc = device_private(self);
        struct gemini_lpc_attach_args *lpc = aux;
        bus_space_tag_t iot;
        bus_space_handle_t ioh;
        bus_addr_t iobase;

        sc->sc_com.sc_dev = self;
        iot = lpc->lpc_iot;
        iobase = lpc->lpc_base + lpc->lpc_addr;
        sc->sc_com.sc_frequency = IT8712F_COM_FREQ;
        sc->sc_com.sc_type = COM_TYPE_NORMAL;

        if (com_is_console(iot, iobase, &ioh) == 0 &&
            bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh)) {
                panic(": can't map registers\n");
                return;
        } 

        com_init_regs(&sc->sc_com.sc_regs, iot, ioh, iobase);

        com_attach_subr(&sc->sc_com);
        aprint_naive("\n");

        if (lpc->lpc_intr == LPCCF_INTR_DEFAULT) {
                /* callout based polliung */
                callout_init(&sc->sc_callout, 0);
                callout_setfunc(&sc->sc_callout, lpc_com_time, sc);
                callout_schedule(&sc->sc_callout, hz/16);
                aprint_normal("%s: callout polling mode\n", device_xname(self));
        } else {
                /* interrupting */
#if 0
                lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
                        IPL_SERIAL, IST_LEVEL_HIGH, comintr, &sc->sc_com);
#else
                lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
                        IPL_SERIAL, IST_LEVEL_LOW, lpc_com_intr, &sc->sc_com);
#endif
        }
}

int
lpc_com_intr(void *arg)
{
        printf(".");
        return comintr(arg);
}

void
lpc_com_time(void *arg)
{
        lpc_com_softc_t *sc = arg;
        int s;

        s = splserial();
        (void)comintr(&sc->sc_com);
        callout_schedule(&sc->sc_callout, hz/16);
        splx(s);
}