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/*
* BRIEF MODULE DESCRIPTION
* Low level uart routines to directly access a TX[34]927 SIO.
*
* Copyright 2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ahennessy@mvista.com or source@mvista.com
*
* Based on arch/mips/ddb5xxx/ddb5477/kgdb_io.c
*
* Copyright (C) 2000-2001 Toshiba Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``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 THE AUTHOR 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <asm/jmr3927/jmr3927.h>
#define TIMEOUT 0xffffff
static int remoteDebugInitialized = 0;
static void debugInit(int baud);
int putDebugChar(unsigned char c)
{
int i = 0;
if (!remoteDebugInitialized) {
remoteDebugInitialized = 1;
debugInit(38400);
}
do {
slow_down();
i++;
if (i>TIMEOUT) {
break;
}
} while (!(tx3927_sioptr(0)->cisr & TXx927_SICISR_TXALS));
tx3927_sioptr(0)->tfifo = c;
return 1;
}
unsigned char getDebugChar(void)
{
int i = 0;
int dicr;
char c;
if (!remoteDebugInitialized) {
remoteDebugInitialized = 1;
debugInit(38400);
}
/* diable RX int. */
dicr = tx3927_sioptr(0)->dicr;
tx3927_sioptr(0)->dicr = 0;
do {
slow_down();
i++;
if (i>TIMEOUT) {
break;
}
} while (tx3927_sioptr(0)->disr & TXx927_SIDISR_UVALID)
;
c = tx3927_sioptr(0)->rfifo;
/* clear RX int. status */
tx3927_sioptr(0)->disr &= ~TXx927_SIDISR_RDIS;
/* enable RX int. */
tx3927_sioptr(0)->dicr = dicr;
return c;
}
static void debugInit(int baud)
{
tx3927_sioptr(0)->lcr = 0x020;
tx3927_sioptr(0)->dicr = 0;
tx3927_sioptr(0)->disr = 0x4100;
tx3927_sioptr(0)->cisr = 0x014;
tx3927_sioptr(0)->fcr = 0;
tx3927_sioptr(0)->flcr = 0x02;
tx3927_sioptr(0)->bgr = ((JMR3927_BASE_BAUD + baud / 2) / baud) |
TXx927_SIBGR_BCLK_T0;
}
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