sys/arch/evbarm/stand/board/epcom.c

   1 /*      $NetBSD: epcom.c,v 1.4 2006/03/08 23:46:23 lukem 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 #define ISSET(t,f)      ((t) & (f))
  51
  52 void
  53 cons_init(void)
  54 {
  55         unsigned long baud, pwrcnt;
  56
  57         while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
  58
  59         /* Make UART base freq 7 MHz */
  60         pwrcnt = SYSCON_READ(PwrCnt);
  61         pwrcnt &= ~(PwrCnt_UARTBAUD);
  62         SYSCON_WRITE(PwrCnt, pwrcnt);
  63
  64         baud = EPCOMSPEED2BRD(CONSPEED);
  65         EPCOM_WRITE(LinCtrlLow, baud & 0xff);
  66         EPCOM_WRITE(LinCtrlMid, baud >> 8);
  67         EPCOM_WRITE(LinCtrlHigh, LinCtrlHigh_FEN|LinCtrlHigh_WLEN);
  68 }
  69
  70 int
  71 getchar(void)
  72 {
  73         while(!ISSET(EPCOM_READ(Flag), Flag_RXFE));
  74         return (EPCOM_READ(Data) & 0xff);
  75 }
  76
  77 void
  78 putchar(int c)
  79 {
  80         while(ISSET(EPCOM_READ(Flag), Flag_TXFF));
  81
  82         if (c == '\n') {
  83                 while(!ISSET(EPCOM_READ(Flag), Flag_TXFE));
  84                 EPCOM_WRITE(Data, '\r');
  85         }
  86
  87         EPCOM_WRITE(Data, c);
  88 }