/*      $NetBSD: dtvar.h,v 1.6 2011/06/04 01:37:36 tsutsui Exp $        */

/*-
 * Copyright (c) 2002, 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Doran.
 *
 * 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.
 */

#ifndef _DTVAR_H_
#define _DTVAR_H_

#define DT_DEVICE_NO(a)         (((a) - DT_ADDR_FIRST) >> 1)
#define DT_GET_SHORT(b0, b1)    (((b0) << 8) | (b1))

struct dt_msg {
        uint8_t dst;
        uint8_t src;
        uint8_t ctl;

        /* varzise, checksum byte at end */
        uint8_t body[DT_MAX_MSG_SIZE-3];

        union {
                SLIST_ENTRY(dt_msg) slist;
                SIMPLEQ_ENTRY(dt_msg) simpleq;
        } chain;
};

#define DT_CTL(l, s, p) \
    ((l & 0x1f) | ((s & 0x03) << 5) | ((p & 0x01) << 7))
#define DT_CTL_P(c)             ((c >> 7) & 0x01)
#define DT_CTL_SUBADDR(c)       ((c >> 5) & 0x03)
#define DT_CTL_LEN(c)           (c & 0x1f)

struct dt_device {
        void    *dtdv_arg;
        void    (*dtdv_handler)(void *, struct dt_msg *);
};

struct dt_state {
        volatile u_int  *ds_data;
        volatile u_int  *ds_poll;
        int             ds_bad_pkts;
        int             ds_state;
        int             ds_escaped;
        int             ds_len;
        int             ds_ptr;
};

struct dt_softc {
        device_t        sc_dev;
        struct dt_msg   sc_msg;
        void            *sc_sih;
        SLIST_HEAD(, dt_msg) sc_free;
        SIMPLEQ_HEAD(, dt_msg) sc_queue;
};

struct dt_attach_args {
        int     dta_addr;
};

#define DT_GET_ERROR    -1
#define DT_GET_DONE     0
#define DT_GET_NOTYET   1

void    dt_cninit(void);
int     dt_identify(int, struct dt_ident *);
int     dt_msg_get(struct dt_msg *, int);
void    dt_msg_dump(struct dt_msg *);
int     dt_establish_handler(struct dt_softc *, struct dt_device *,
    void *, void (*)(void *, struct dt_msg *));

extern int      dt_kbd_addr;
extern struct   dt_device dt_kbd_dv;
extern int      dt_ms_addr;
extern struct   dt_device dt_ms_dv;
extern struct   dt_state dt_state;

#endif  /* !_DTVAR_H_ */