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On-chip EP93xx UART support

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joff 2004-12-24 10:34:27 +00:00
parent a1ed993cf1
commit eadf291885
1 changed files with 95 additions and 0 deletions
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sys/arch/evbarm/stand/board/epcom.c Normal file
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/* $NetBSD: epcom.c,v 1.1 2004/12/24 10:34:27 joff 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.
* 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.
*/
/*
* 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)
#define ISSET(t,f) ((t) & (f))
void
cons_init(void)
{
unsigned long baud, pwrcnt;
while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
/* Make UART base freq 7Mhz */
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);
}