/*      $NetBSD: epcom.c,v 1.6 2022/09/05 14:14:42 tsutsui Exp $        */

/*
* Copyright (c) 2004 Jesse Off
* 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 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.
*/

/*
* This file provides the cons_init() function and console I/O routines
* for boards that use the ep93xx ARM SoC UARTs
*/

#include <sys/types.h>
#include <arm/ep93xx/epcomreg.h>
#include <arm/ep93xx/ep93xxreg.h>
#include <lib/libsa/stand.h>

#include "board.h"

#define SCADDR  (EP93XX_APB_HWBASE + EP93XX_APB_SYSCON)
#define EPCOM_READ(x)           *((volatile uint32_t *) (CONADDR + (EPCOM_ ## x)))
#define EPCOM_WRITE(x, v)       *((volatile uint32_t *) \
                                       (CONADDR + (EPCOM_ ## x))) = (v)
#define SYSCON_READ(x)          *((volatile uint32_t *) \
                                       (SCADDR + (EP93XX_SYSCON_ ## x)))
#define SYSCON_WRITE(x, v)      *((volatile uint32_t *) \
                                       (SCADDR + (EP93XX_SYSCON_ ## x))) = (v)

void
cons_init(void)
{
       unsigned long baud, pwrcnt;

       while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));

       /* Make UART base freq 7 MHz */
       pwrcnt = SYSCON_READ(PwrCnt);
       pwrcnt &= ~(PwrCnt_UARTBAUD);
       SYSCON_WRITE(PwrCnt, pwrcnt);

       baud = EPCOMSPEED2BRD(CONSPEED);
       EPCOM_WRITE(LinCtrlLow, baud & 0xff);
       EPCOM_WRITE(LinCtrlMid, baud >> 8);
       EPCOM_WRITE(LinCtrlHigh, LinCtrlHigh_FEN|LinCtrlHigh_WLEN);
}

int
getchar(void)
{
       while(!ISSET(EPCOM_READ(Flag), Flag_RXFE));
       return (EPCOM_READ(Data) & 0xff);
}

void
putchar(int c)
{
       while(ISSET(EPCOM_READ(Flag), Flag_TXFF));

       if (c == '\n') {
               while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
               EPCOM_WRITE(Data, '\r');
       }

       EPCOM_WRITE(Data, c);
}