106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/*
|
|
* 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;
|
|
}
|