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 int altera_serial_tstc(void)
87 return (readl (&uart
->status
) & NIOS_UART_RRDY
);
90 static int altera_serial_getc(void)
92 while (serial_tstc () == 0)
94 return (readl (&uart
->rxdata
) & 0x00ff );
97 static struct serial_device altera_serial_drv
= {
98 .name
= "altera_serial",
99 .start
= altera_serial_init
,
101 .setbrg
= altera_serial_setbrg
,
102 .putc
= altera_serial_putc
,
103 .puts
= default_serial_puts
,
104 .getc
= altera_serial_getc
,
105 .tstc
= altera_serial_tstc
,
108 void altera_serial_initialize(void)
110 serial_register(&altera_serial_drv
);
113 __weak
struct serial_device
*default_serial_console(void)
115 return &altera_serial_drv
;