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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/altera_uart.c
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,
30 DECLARE_GLOBAL_DATA_PTR
;
32 /*------------------------------------------------------------------
33 * UART the serial port
34 *-----------------------------------------------------------------*/
36 static nios_uart_t
*uart
= (nios_uart_t
*) CONFIG_SYS_NIOS_CONSOLE
;
38 #if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
40 /* Everything's already setup for fixed-baud PTF
43 void serial_setbrg (void){ return; }
44 int serial_init (void) { return (0);}
48 void serial_setbrg (void)
52 div
= (CONFIG_SYS_CLK_FREQ
/gd
->baudrate
)-1;
53 writel (div
, &uart
->divisor
);
57 int serial_init (void)
63 #endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
65 /*-----------------------------------------------------------------------
67 *---------------------------------------------------------------------*/
68 void serial_putc (char c
)
72 while ((readl (&uart
->status
) & NIOS_UART_TRDY
) == 0)
74 writel ((unsigned char)c
, &uart
->txdata
);
77 void serial_puts (const char *s
)
84 int serial_tstc (void)
86 return (readl (&uart
->status
) & NIOS_UART_RRDY
);
89 int serial_getc (void)
91 while (serial_tstc () == 0)
93 return (readl (&uart
->rxdata
) & 0x00ff );