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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>
32#include <asm/arch/netarm_registers.h>
33
34#ifdef CONFIG_NETARM
35
36#define PORTA (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
37#define PORTB (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
38
39/* wait until transmitter is ready for another character */
40#define TXWAITRDY(registers) \
41{ \
42 ulong tmo = get_timer(0) + 1 * CFG_HZ; \
43 while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) { \
44 if (get_timer(0) > tmo) \
45 break; \
46 } \
47}
48
49
50volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
51volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
52
53extern void _netarm_led_FAIL1(void);
54
55/*
56 * Setup both serial i/f with given baudrate
57 */
58void serial_setbrg (void)
59{
60 /* get the gd pointer */
61 DECLARE_GLOBAL_DATA_PTR;
62
63 /* set 0 ... make sure pins are configured for serial */
64 PORTA = PORTB =
65 NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
66
67 /* first turn em off */
68 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
69
70 /* clear match register, we don't need it */
71 serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
72
73 /* setup bit rate generator and rx buffer gap timer (1 byte only) */
74 if ((gd->baudrate >= MIN_BAUD_RATE)
75 && (gd->baudrate <= MAX_BAUD_RATE)) {
76 serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
77 NETARM_SER_BR_X16 (gd->baudrate);
78 serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
79 0;
80 serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
81 NETARM_SER_RXGAP (gd->baudrate);
82 } else {
83 hang ();
84 }
85
86 /* setup port mode */
87 serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
88 ( NETARM_SER_CTLB_RCGT_EN |
89 NETARM_SER_CTLB_UART_MODE);
90 serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
91 ( NETARM_SER_CTLA_ENABLE |
92 NETARM_SER_CTLA_P_NONE |
93 /* see errata */
94 NETARM_SER_CTLA_2STOP |
95 NETARM_SER_CTLA_8BITS |
96 NETARM_SER_CTLA_DTR_EN |
97 NETARM_SER_CTLA_RTS_EN);
98}
99
100
101/*
102 * Initialise the serial port with the given baudrate. The settings
103 * are always 8 data bits, no parity, 1 stop bit, no start bits.
104 */
105int serial_init (void)
106{
107 serial_setbrg ();
108 return 0;
109}
110
111
112/*
113 * Output a single byte to the serial port.
114 */
115void serial_putc (const char c)
116{
117 volatile unsigned char *fifo;
118
119 /* If \n, also do \r */
120 if (c == '\n')
121 serial_putc ('\r');
122
123 fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
124 TXWAITRDY (serial_reg_ch1);
125 *fifo = c;
126}
127
128/*
129 * Test of a single byte from the serial port. Returns 1 on success, 0
130 * otherwise.
131 */
132int serial_tstc(void)
133{
134 return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
135}
136
137/*
138 * Read a single byte from the serial port. Returns 1 on success, 0
139 * otherwise.
140 */
141int serial_getc (void)
142{
143 unsigned int ch_uint;
144 volatile unsigned int *fifo;
145 volatile unsigned char *fifo_char = NULL;
146 int buf_count = 0;
147
148 while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
149 /* NOP */ ;
150
151 fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
152 fifo_char = (unsigned char *) &ch_uint;
153 ch_uint = *fifo;
154
155 buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
156 switch (buf_count) {
157 case NETARM_SER_STATA_RXFDB_4BYTES:
158 buf_count = 4;
159 break;
160 case NETARM_SER_STATA_RXFDB_3BYTES:
161 buf_count = 3;
162 break;
163 case NETARM_SER_STATA_RXFDB_2BYTES:
164 buf_count = 2;
165 break;
166 case NETARM_SER_STATA_RXFDB_1BYTES:
167 buf_count = 1;
168 break;
169 default:
170 /* panic, be never here */
171 }
172
173 serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
174
175 return ch_uint & 0xff;
176}
177
178void serial_puts (const char *s)
179{
180 while (*s) {
181 serial_putc (*s++);
182 }
183}
184
185#endif /* CONFIG_NETARM */