1 /*
2  * (C) Copyright 2004 Atmark Techno, Inc.
3  *
4  * Yasushi SHOJI <yashi@atmark-techno.com>
5  *
6  * See file CREDITS for list of people who contributed to this
7  * project.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation; either version 2 of
12  * the License, or (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22  * MA 02111-1307 USA
23  */
24 
25 #include <config.h>
26 
27 #ifdef	CONFIG_XILINX_UARTLITE
28 
29 #include <asm/serial_xuartlite.h>
30 
31 /* FIXME: we should convert these to in32 and out32 */
32 #define IO_WORD(offset)	     (*(volatile unsigned long *)(offset))
33 #define IO_SERIAL(offset)    IO_WORD(CONFIG_SERIAL_BASE + (offset))
34 
35 #define IO_SERIAL_RX_FIFO   IO_SERIAL(XUL_RX_FIFO_OFFSET)
36 #define IO_SERIAL_TX_FIFO   IO_SERIAL(XUL_TX_FIFO_OFFSET)
37 #define IO_SERIAL_STATUS    IO_SERIAL(XUL_STATUS_REG_OFFSET)
38 #define IO_SERIAL_CONTROL   IO_SERIAL(XUL_CONTROL_REG_OFFSET)
39 
40 int serial_init(void)
41 {
42 	/* FIXME: Nothing for now. We should initialize fifo, etc */
43 	return 0;
44 }
45 
46 void serial_setbrg(void)
47 {
48 	/* FIXME: what's this for? */
49 }
50 
51 void serial_putc(const char c)
52 {
53 	if (c == '\n') serial_putc('\r');
54 	while (IO_SERIAL_STATUS & XUL_SR_TX_FIFO_FULL);
55 	IO_SERIAL_TX_FIFO = (unsigned char) (c & 0xff);
56 }
57 
58 void serial_puts(const char * s)
59 {
60 	while (*s) {
61 		serial_putc(*s++);
62 	}
63 }
64 
65 int serial_getc(void)
66 {
67 	while (!(IO_SERIAL_STATUS & XUL_SR_RX_FIFO_VALID_DATA));
68 	return IO_SERIAL_RX_FIFO & 0xff;
69 }
70 
71 int serial_tstc(void)
72 {
73 	return (IO_SERIAL_STATUS & XUL_SR_RX_FIFO_VALID_DATA);
74 }
75 
76 #endif	/* CONFIG_MICROBLZE */
77