2 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3 * Scott McNutt <smcnutt@psyent.com>
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
29 #include <linux/compiler.h>
32 DECLARE_GLOBAL_DATA_PTR;
34 /*------------------------------------------------------------------
35 * UART the serial port
36 *-----------------------------------------------------------------*/
38 static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
40 #if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
43 * Everything's already setup for fixed-baud PTF
46 static void altera_serial_setbrg(void)
50 static int altera_serial_init(void)
57 static void altera_serial_setbrg(void)
61 div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
62 writel (div, &uart->divisor);
65 static int altera_serial_init(void)
71 #endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
73 /*-----------------------------------------------------------------------
75 *---------------------------------------------------------------------*/
76 static void altera_serial_putc(char c)
80 while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
82 writel ((unsigned char)c, &uart->txdata);
85 static void altera_serial_puts(const char *s)
92 static int altera_serial_tstc(void)
94 return (readl (&uart->status) & NIOS_UART_RRDY);
97 static int altera_serial_getc(void)
99 while (serial_tstc () == 0)
101 return (readl (&uart->rxdata) & 0x00ff );
104 #ifdef CONFIG_SERIAL_MULTI
105 static struct serial_device altera_serial_drv = {
106 .name = "altera_serial",
107 .start = altera_serial_init,
109 .setbrg = altera_serial_setbrg,
110 .putc = altera_serial_putc,
111 .puts = altera_serial_puts,
112 .getc = altera_serial_getc,
113 .tstc = altera_serial_tstc,
116 void altera_serial_initialize(void)
118 serial_register(&altera_serial_drv);
121 __weak struct serial_device *default_serial_console(void)
123 return &altera_serial_drv;
126 int serial_init(void)
128 return altera_serial_init();
131 void serial_setbrg(void)
133 altera_serial_setbrg();
136 void serial_putc(const char c)
138 altera_serial_putc(c);
141 void serial_puts(const char *s)
143 altera_serial_puts(s);
146 int serial_getc(void)
148 return altera_serial_getc();
151 int serial_tstc(void)
153 return altera_serial_tstc();