blob: 045f1197a344476c4a80bb1bef29d3c43b6cdc29 [file] [log] [blame]
Scott McNuttc9d4f462010-03-19 19:03:28 -04001/*
2 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3 * Scott McNutt <smcnutt@psyent.com>
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24
25#include <common.h>
26#include <watchdog.h>
27#include <asm/io.h>
28#include <nios2-io.h>
29
30DECLARE_GLOBAL_DATA_PTR;
31
32/*------------------------------------------------------------------
33 * UART the serial port
34 *-----------------------------------------------------------------*/
35
36static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
37
38#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
39
40/* Everything's already setup for fixed-baud PTF
41 * assignment
42 */
43void serial_setbrg (void){ return; }
44int serial_init (void) { return (0);}
45
46#else
47
48void serial_setbrg (void)
49{
50 unsigned div;
51
52 div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
Scott McNutt3ea00372010-03-21 21:24:43 -040053 writel (div, &uart->divisor);
Scott McNuttc9d4f462010-03-19 19:03:28 -040054 return;
55}
56
57int serial_init (void)
58{
59 serial_setbrg ();
60 return (0);
61}
62
63#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
64
65/*-----------------------------------------------------------------------
66 * UART CONSOLE
67 *---------------------------------------------------------------------*/
68void serial_putc (char c)
69{
70 if (c == '\n')
71 serial_putc ('\r');
72 while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
73 WATCHDOG_RESET ();
Scott McNutt3ea00372010-03-21 21:24:43 -040074 writel ((unsigned char)c, &uart->txdata);
Scott McNuttc9d4f462010-03-19 19:03:28 -040075}
76
77void serial_puts (const char *s)
78{
79 while (*s != 0) {
80 serial_putc (*s++);
81 }
82}
83
84int serial_tstc (void)
85{
86 return (readl (&uart->status) & NIOS_UART_RRDY);
87}
88
89int serial_getc (void)
90{
91 while (serial_tstc () == 0)
92 WATCHDOG_RESET ();
93 return (readl (&uart->rxdata) & 0x00ff );
94}