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epcom.c revision 1.3.8.1 
      1 /*	$NetBSD: epcom.c,v 1.3.8.1 2006/03/13 09:06:53 yamt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2004 Jesse Off
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed for the NetBSD Project by
     18  *	Wasabi Systems, Inc.
     19  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     20  *    or promote products derived from this software without specific prior
     21  *    written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     33  * POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 /*
     37  * This file provides the cons_init() function and console I/O routines
     38  * for boards that use the ep93xx ARM SoC UARTs
     39  */
     40 
     41 #include <sys/types.h>
     42 #include <arm/ep93xx/epcomreg.h>
     43 #include <arm/ep93xx/ep93xxreg.h>
     44 #include <lib/libsa/stand.h>
     45 
     46 #include "board.h"
     47 
     48 #define SCADDR	(EP93XX_APB_HWBASE + EP93XX_APB_SYSCON)
     49 #define	EPCOM_READ(x)		*((volatile uint32_t *) (CONADDR + (EPCOM_ ## x)))
     50 #define	EPCOM_WRITE(x, v)	*((volatile uint32_t *) \
     51 					(CONADDR + (EPCOM_ ## x))) = (v)
     52 #define	SYSCON_READ(x)		*((volatile uint32_t *) \
     53 					(SCADDR + (EP93XX_SYSCON_ ## x)))
     54 #define	SYSCON_WRITE(x, v)	*((volatile uint32_t *) \
     55 					(SCADDR + (EP93XX_SYSCON_ ## x))) = (v)
     56 
     57 #define	ISSET(t,f)	((t) & (f))
     58 
     59 void
     60 cons_init(void)
     61 {
     62 	unsigned long baud, pwrcnt;
     63 
     64 	while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
     65 
     66 	/* Make UART base freq 7 MHz */
     67 	pwrcnt = SYSCON_READ(PwrCnt);
     68 	pwrcnt &= ~(PwrCnt_UARTBAUD);
     69 	SYSCON_WRITE(PwrCnt, pwrcnt);
     70 
     71 	baud = EPCOMSPEED2BRD(CONSPEED);
     72 	EPCOM_WRITE(LinCtrlLow, baud & 0xff);
     73 	EPCOM_WRITE(LinCtrlMid, baud >> 8);
     74 	EPCOM_WRITE(LinCtrlHigh, LinCtrlHigh_FEN|LinCtrlHigh_WLEN);
     75 }
     76 
     77 int
     78 getchar(void)
     79 {
     80 	while(!ISSET(EPCOM_READ(Flag), Flag_RXFE));
     81 	return (EPCOM_READ(Data) & 0xff);
     82 }
     83 
     84 void
     85 putchar(int c)
     86 {
     87 	while(ISSET(EPCOM_READ(Flag), Flag_TXFF));
     88 
     89 	if (c == '\n') {
     90 		while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
     91 		EPCOM_WRITE(Data, '\r');
     92 	}
     93 
     94 	EPCOM_WRITE(Data, c);
     95 }
     96