diff options
Diffstat (limited to 'drivers/serial/altera_jtag_uart.c')
-rw-r--r-- | drivers/serial/altera_jtag_uart.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/serial/altera_jtag_uart.c b/drivers/serial/altera_jtag_uart.c new file mode 100644 index 0000000..9eccaa0 --- /dev/null +++ b/drivers/serial/altera_jtag_uart.c @@ -0,0 +1,70 @@ +/* + * (C) Copyright 2004, Psyent Corporation <www.psyent.com> + * Scott McNutt <smcnutt@psyent.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <watchdog.h> +#include <asm/io.h> +#include <nios2-io.h> + +DECLARE_GLOBAL_DATA_PTR; + +/*------------------------------------------------------------------ + * JTAG acts as the serial port + *-----------------------------------------------------------------*/ +static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE; + +void serial_setbrg( void ){ return; } +int serial_init( void ) { return(0);} + +void serial_putc (char c) +{ + while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0) + WATCHDOG_RESET (); + writel (&jtag->data, (unsigned char)c); +} + +void serial_puts (const char *s) +{ + while (*s != 0) + serial_putc (*s++); +} + +int serial_tstc (void) +{ + return ( readl (&jtag->control) & NIOS_JTAG_RRDY); +} + +int serial_getc (void) +{ + int c; + unsigned val; + + while (1) { + WATCHDOG_RESET (); + val = readl (&jtag->data); + if (val & NIOS_JTAG_RVALID) + break; + } + c = val & 0x0ff; + return (c); +} |