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wdenk2d1a5372004-02-23 19:30:57 +00001/*
2 * Serial Port stuff - taken from Linux
3 *
4 * (C) Copyright 2002
5 * MAZeT GmbH <www.mazet.de>
6 * Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
7 *
8 * (c) 2004
9 * IMMS gGmbH <www.imms.de>
10 * Thomas Elste <info@elste.org>
11 *
12 * See file CREDITS for list of people who contributed to this
13 * project.
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <common.h>
wdenk2d1a5372004-02-23 19:30:57 +000032
33#ifdef CONFIG_NETARM
34
wdenk39539882004-07-01 16:30:44 +000035#include <asm/hardware.h>
36
wdenk2d1a5372004-02-23 19:30:57 +000037#define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
38#define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
39
40/* wait until transmitter is ready for another character */
41#define TXWAITRDY(registers) \
42{ \
43 ulong tmo = get_timer(0) + 1 * CFG_HZ; \
44 while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
45 if (get_timer(0) > tmo) \
46 break; \
47 } \
48}
49
50
51volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
52volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
53
54extern void _netarm_led_FAIL1(void);
55
56/*
57 * Setup both serial i/f with given baudrate
58 */
59void serial_setbrg (void)
60{
61 /* get the gd pointer */
62 DECLARE_GLOBAL_DATA_PTR;
63
64 /* set 0 ... make sure pins are configured for serial */
65 PORTA = PORTB =
66 NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
67
68 /* first turn em off */
69 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
70
71 /* clear match register, we don't need it */
72 serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
73
74 /* setup bit rate generator and rx buffer gap timer (1 byte only) */
75 if ((gd->baudrate >= MIN_BAUD_RATE)
76 && (gd->baudrate <= MAX_BAUD_RATE)) {
77 serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
78 NETARM_SER_BR_X16 (gd->baudrate);
79 serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
80 0;
81 serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
82 NETARM_SER_RXGAP (gd->baudrate);
83 } else {
84 hang ();
85 }
86
87 /* setup port mode */
88 serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
89 ( NETARM_SER_CTLB_RCGT_EN |
90 NETARM_SER_CTLB_UART_MODE);
91 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
92 ( NETARM_SER_CTLA_ENABLE |
93 NETARM_SER_CTLA_P_NONE |
94 /* see errata */
95 NETARM_SER_CTLA_2STOP |
96 NETARM_SER_CTLA_8BITS |
97 NETARM_SER_CTLA_DTR_EN |
98 NETARM_SER_CTLA_RTS_EN);
99}
100
101
102/*
103 * Initialise the serial port with the given baudrate. The settings
104 * are always 8 data bits, no parity, 1 stop bit, no start bits.
105 */
106int serial_init (void)
107{
108 serial_setbrg ();
109 return 0;
110}
111
112
113/*
114 * Output a single byte to the serial port.
115 */
116void serial_putc (const char c)
117{
118 volatile unsigned char *fifo;
119
120 /* If \n, also do \r */
121 if (c == '\n')
122 serial_putc ('\r');
123
124 fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
125 TXWAITRDY (serial_reg_ch1);
126 *fifo = c;
127}
128
129/*
130 * Test of a single byte from the serial port. Returns 1 on success, 0
131 * otherwise.
132 */
133int serial_tstc(void)
134{
135 return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
136}
137
138/*
139 * Read a single byte from the serial port. Returns 1 on success, 0
140 * otherwise.
141 */
142int serial_getc (void)
143{
144 unsigned int ch_uint;
145 volatile unsigned int *fifo;
146 volatile unsigned char *fifo_char = NULL;
147 int buf_count = 0;
148
149 while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
150 /* NOP */ ;
151
152 fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
153 fifo_char = (unsigned char *) &ch_uint;
154 ch_uint = *fifo;
155
156 buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
157 switch (buf_count) {
158 case NETARM_SER_STATA_RXFDB_4BYTES:
159 buf_count = 4;
160 break;
161 case NETARM_SER_STATA_RXFDB_3BYTES:
162 buf_count = 3;
163 break;
164 case NETARM_SER_STATA_RXFDB_2BYTES:
165 buf_count = 2;
166 break;
167 case NETARM_SER_STATA_RXFDB_1BYTES:
168 buf_count = 1;
169 break;
170 default:
171 /* panic, be never here */
wdenke86e5a02004-10-17 21:12:06 +0000172 break;
wdenk2d1a5372004-02-23 19:30:57 +0000173 }
174
175 serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
176
177 return ch_uint & 0xff;
178}
179
180void serial_puts (const char *s)
181{
182 while (*s) {
183 serial_putc (*s++);
184 }
185}
186
187#endif /* CONFIG_NETARM */