e4cc71aa44
Add Nios GDB/JTAG Console support: - Add stubs to support gdb via JTAG. - Add support for console over JTAG. - Minor cleanup.
135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
/*
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* (C) Copyright 2003, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <nios-io.h>
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/*------------------------------------------------------------------
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* JTAG acts as the serial port
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*-----------------------------------------------------------------*/
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#if defined(CONFIG_CONSOLE_JTAG)
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static nios_jtag_t *jtag = (nios_jtag_t *)CFG_NIOS_CONSOLE;
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void serial_setbrg( void ){ return; }
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int serial_init( void ) { return(0);}
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void serial_putc (char c)
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{
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while ((jtag->txcntl & NIOS_JTAG_TRDY) != 0)
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WATCHDOG_RESET ();
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jtag->txcntl = NIOS_JTAG_TRDY | (unsigned char)c;
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}
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void serial_puts (const char *s)
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{
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while (*s != 0)
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serial_putc (*s++);
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}
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int serial_tstc (void)
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{
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return (jtag->rxcntl & NIOS_JTAG_RRDY);
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}
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int serial_getc (void)
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{
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int c;
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while (serial_tstc() == 0)
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WATCHDOG_RESET ();
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c = jtag->rxcntl & 0x0ff;
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jtag->rxcntl = 0;
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return (c);
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}
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/*------------------------------------------------------------------
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* UART the serial port
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*-----------------------------------------------------------------*/
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#else
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static nios_uart_t *uart = (nios_uart_t *)CFG_NIOS_CONSOLE;
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#if defined(CFG_NIOS_FIXEDBAUD)
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/* Everything's already setup for fixed-baud PTF
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* assignment
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*/
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void serial_setbrg (void){ return; }
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int serial_init (void) { return (0);}
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#else
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void serial_setbrg (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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unsigned div;
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div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
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uart->divisor = div;
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return;
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}
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int serial_init (void)
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{
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serial_setbrg ();
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return (0);
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}
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#endif /* CFG_NIOS_FIXEDBAUD */
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/*-----------------------------------------------------------------------
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* UART CONSOLE
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*---------------------------------------------------------------------*/
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void serial_putc (char c)
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{
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if (c == '\n')
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serial_putc ('\r');
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while ((uart->status & NIOS_UART_TRDY) == 0)
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WATCHDOG_RESET ();
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uart->txdata = (unsigned char)c;
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}
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void serial_puts (const char *s)
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{
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while (*s != 0) {
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serial_putc (*s++);
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}
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}
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int serial_tstc (void)
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{
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return (uart->status & NIOS_UART_RRDY);
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}
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int serial_getc (void)
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{
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while (serial_tstc () == 0)
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WATCHDOG_RESET ();
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return( uart->rxdata & 0x00ff );
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}
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#endif /* CONFIG_JTAG_CONSOLE */
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