102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
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* (C) Copyright 2004, 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 <asm/io.h>
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#include <nios2-io.h>
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#include <linux/compiler.h>
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#include <serial.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*------------------------------------------------------------------
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* JTAG acts as the serial port
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*-----------------------------------------------------------------*/
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static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE;
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static void altera_jtag_serial_setbrg(void)
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{
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}
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static int altera_jtag_serial_init(void)
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{
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return 0;
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}
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static void altera_jtag_serial_putc(char c)
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{
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while (1) {
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unsigned st = readl(&jtag->control);
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if (NIOS_JTAG_WSPACE(st))
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break;
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#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
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if (!(st & NIOS_JTAG_AC)) /* no connection */
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return;
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#endif
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WATCHDOG_RESET();
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}
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writel ((unsigned char)c, &jtag->data);
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}
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static int altera_jtag_serial_tstc(void)
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{
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return ( readl (&jtag->control) & NIOS_JTAG_RRDY);
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}
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static int altera_jtag_serial_getc(void)
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{
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int c;
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unsigned val;
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while (1) {
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WATCHDOG_RESET ();
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val = readl (&jtag->data);
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if (val & NIOS_JTAG_RVALID)
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break;
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}
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c = val & 0x0ff;
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return (c);
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}
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static struct serial_device altera_jtag_serial_drv = {
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.name = "altera_jtag_uart",
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.start = altera_jtag_serial_init,
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.stop = NULL,
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.setbrg = altera_jtag_serial_setbrg,
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.putc = altera_jtag_serial_putc,
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.puts = default_serial_puts,
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.getc = altera_jtag_serial_getc,
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.tstc = altera_jtag_serial_tstc,
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};
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void altera_jtag_serial_initialize(void)
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{
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serial_register(&altera_jtag_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &altera_jtag_serial_drv;
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}
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