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microblaze: Clean uartlite driver
[people/ms/u-boot.git] / drivers / serial / serial_xuartlite.c
1 /*
2 * (C) Copyright 2008 Michal Simek <monstr@monstr.eu>
3 * Clean driver and add xilinx constant from header file
4 *
5 * (C) Copyright 2004 Atmark Techno, Inc.
6 * Yasushi SHOJI <yashi@atmark-techno.com>
7 *
8 * See file CREDITS for list of people who contributed to this
9 * project.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 * MA 02111-1307 USA
25 */
26
27 #include <config.h>
28 #include <asm/io.h>
29
30 #ifdef CONFIG_XILINX_UARTLITE
31
32 #define RX_FIFO_OFFSET 0 /* receive FIFO, read only */
33 #define TX_FIFO_OFFSET 4 /* transmit FIFO, write only */
34 #define STATUS_REG_OFFSET 8 /* status register, read only */
35
36 #define SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */
37 #define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */
38 #define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */
39
40 #define UARTLITE_STATUS (CONFIG_SERIAL_BASE + STATUS_REG_OFFSET)
41 #define UARTLITE_TX_FIFO (CONFIG_SERIAL_BASE + TX_FIFO_OFFSET)
42 #define UARTLITE_RX_FIFO (CONFIG_SERIAL_BASE + RX_FIFO_OFFSET)
43
44 int serial_init(void)
45 {
46 /* FIXME: Nothing for now. We should initialize fifo, etc */
47 return 0;
48 }
49
50 void serial_setbrg(void)
51 {
52 /* FIXME: what's this for? */
53 }
54
55 void serial_putc(const char c)
56 {
57 if (c == '\n')
58 serial_putc('\r');
59 while (in_be32(UARTLITE_STATUS) & SR_TX_FIFO_FULL);
60 out_be32(UARTLITE_TX_FIFO, (unsigned char) (c & 0xff));
61 }
62
63 void serial_puts(const char * s)
64 {
65 while (*s) {
66 serial_putc(*s++);
67 }
68 }
69
70 int serial_getc(void)
71 {
72 while (!(in_be32(UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA));
73 return in_be32(UARTLITE_RX_FIFO) & 0xff;
74 }
75
76 int serial_tstc(void)
77 {
78 return (in_be32(UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA);
79 }
80
81 #endif /* CONFIG_MICROBLZE */