/*      $NetBSD: com.c,v 1.4 2008/04/28 20:23:21 martin Exp $   */

/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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.
*/

/*
* Copyright (c) 1991 The Regents of the University of California.
* 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 University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*      @(#)com.c       7.5 (Berkeley) 5/16/91
*/

#include <sys/param.h>

#include <lib/libsa/stand.h>

#include <hpcmips/vr/vripreg.h>
#include <hpcmips/vr/cmureg.h>

#include <dev/ic/comreg.h>
#include <dev/ic/ns16550reg.h>
#include <dev/ic/st16650reg.h>
#define com_lcr com_cfcr

#include "extern.h"

#if 0
#define VRCOM_FREQ      18432000        /* 18.432kHz */
#endif

int
iskey(void)
{
       return ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_RXRDY);
}

int
getchar(void)
{
       u_int8_t        stat;
       u_int8_t        c;

       /* block until a character becomes available */
       while (!ISKEY)
               ;

       c = REGREAD_1(VR4181_SIU_ADDR, com_data);
       stat = REGREAD_1(VR4181_SIU_ADDR, com_iir);

       return c;
}

static void
comcnputc(int c)
{
       int     timo;

       /* wait for any pending transmission to finish */
       timo = 150000;
       while (!ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_TXRDY)
              && --timo)
               continue;

       REGWRITE_1(VR4181_SIU_ADDR, com_data, c);

       /* wait for this transmission to complete */
       timo = 1500000;
       while (!ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_TXRDY)
              && --timo)
               continue;
}

void
putchar(int c)
{
       if (c == '\n')
               comcnputc('\r');
       comcnputc(c);
}

/*
* Initialize UART for use as console or KGDB line.
*/
void
comcninit(void)
{
       int             rate;

       /* enable divisor latch access and set bit rate */
       REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_DLAB);
       rate = 10; /* 115200bps with VRCOM_FREQ */
       REGWRITE_1(VR4181_SIU_ADDR, com_dlbl, rate);
       REGWRITE_1(VR4181_SIU_ADDR, com_dlbh, rate >> 8);

       /*
        * disable divisor latch access and,
        * set "8bit non-parity 1 stop bit"
        */
       REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_8BITS);

       /* disable all interrupt */
       REGWRITE_1(VR4181_SIU_ADDR, com_ier, 0);

       /* enable FIFO */
       REGWRITE_1(VR4181_SIU_ADDR, com_fifo,
                  FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);

       /* set DTR and RTS low */
       REGWRITE_1(VR4181_SIU_ADDR, com_mcr, MCR_DTR | MCR_RTS);
}