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      1 /*	$NetBSD: epcom.c,v 1.6 2022/09/05 14:14:42 tsutsui 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  *
     16  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /*
     30  * This file provides the cons_init() function and console I/O routines
     31  * for boards that use the ep93xx ARM SoC UARTs
     32  */
     33 
     34 #include <sys/types.h>
     35 #include <arm/ep93xx/epcomreg.h>
     36 #include <arm/ep93xx/ep93xxreg.h>
     37 #include <lib/libsa/stand.h>
     38 
     39 #include "board.h"
     40 
     41 #define SCADDR	(EP93XX_APB_HWBASE + EP93XX_APB_SYSCON)
     42 #define	EPCOM_READ(x)		*((volatile uint32_t *) (CONADDR + (EPCOM_ ## x)))
     43 #define	EPCOM_WRITE(x, v)	*((volatile uint32_t *) \
     44 					(CONADDR + (EPCOM_ ## x))) = (v)
     45 #define	SYSCON_READ(x)		*((volatile uint32_t *) \
     46 					(SCADDR + (EP93XX_SYSCON_ ## x)))
     47 #define	SYSCON_WRITE(x, v)	*((volatile uint32_t *) \
     48 					(SCADDR + (EP93XX_SYSCON_ ## x))) = (v)
     49 
     50 void
     51 cons_init(void)
     52 {
     53 	unsigned long baud, pwrcnt;
     54 
     55 	while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
     56 
     57 	/* Make UART base freq 7 MHz */
     58 	pwrcnt = SYSCON_READ(PwrCnt);
     59 	pwrcnt &= ~(PwrCnt_UARTBAUD);
     60 	SYSCON_WRITE(PwrCnt, pwrcnt);
     61 
     62 	baud = EPCOMSPEED2BRD(CONSPEED);
     63 	EPCOM_WRITE(LinCtrlLow, baud & 0xff);
     64 	EPCOM_WRITE(LinCtrlMid, baud >> 8);
     65 	EPCOM_WRITE(LinCtrlHigh, LinCtrlHigh_FEN|LinCtrlHigh_WLEN);
     66 }
     67 
     68 int
     69 getchar(void)
     70 {
     71 	while(!ISSET(EPCOM_READ(Flag), Flag_RXFE));
     72 	return (EPCOM_READ(Data) & 0xff);
     73 }
     74 
     75 void
     76 putchar(int c)
     77 {
     78 	while(ISSET(EPCOM_READ(Flag), Flag_TXFF));
     79 
     80 	if (c == '\n') {
     81 		while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
     82 		EPCOM_WRITE(Data, '\r');
     83 	}
     84 
     85 	EPCOM_WRITE(Data, c);
     86 }
     87