source: SVN/rincon/u-boot/cpu/arm720t/serial_netarm.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 5.1 KB
Line 
1/*
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
33#ifdef CONFIG_NETARM
34
35#include <asm/hardware.h>
36
37DECLARE_GLOBAL_DATA_PTR;
38
39#define PORTA   (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTA))
40#if !defined(CONFIG_NETARM_NS7520)
41#define PORTB   (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTB))
42#else
43#define PORTC   (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_PORTC))
44#endif
45
46/* wait until transmitter is ready for another character */
47#define TXWAITRDY(registers)                                                    \
48{                                                                               \
49        ulong tmo = get_timer(0) + 1 * CFG_HZ;                                  \
50        while (((registers)->status_a & NETARM_SER_STATA_TX_RDY) == 0 ) {       \
51                if (get_timer(0) > tmo)                                         \
52                        break;                                                  \
53        }                                                                       \
54}
55
56
57#ifndef CONFIG_UART1_CONSOLE
58volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(0);
59volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(1);
60#else
61volatile netarm_serial_channel_t *serial_reg_ch1 = get_serial_channel(1);
62volatile netarm_serial_channel_t *serial_reg_ch2 = get_serial_channel(0);
63#endif
64
65extern void _netarm_led_FAIL1(void);
66
67/*
68 * Setup both serial i/f with given baudrate
69 */
70void serial_setbrg (void)
71{
72        /* set 0 ... make sure pins are configured for serial */
73#if !defined(CONFIG_NETARM_NS7520)
74        PORTA = PORTB =
75                NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
76#else
77        PORTA = NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
78        PORTC = NETARM_GEN_PORT_CSF (0xef) | NETARM_GEN_PORT_MODE (0xef) | NETARM_GEN_PORT_DIR (0xe0);
79#endif
80
81        /* first turn em off */
82        serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a = 0;
83
84        /* clear match register, we don't need it */
85        serial_reg_ch1->rx_match = serial_reg_ch2->rx_match = 0;
86
87        /* setup bit rate generator and rx buffer gap timer (1 byte only) */
88        if ((gd->baudrate >= MIN_BAUD_RATE)
89            && (gd->baudrate <= MAX_BAUD_RATE)) {
90                serial_reg_ch1->bitrate = serial_reg_ch2->bitrate =
91                        NETARM_SER_BR_X16 (gd->baudrate);
92                serial_reg_ch1->rx_buf_timer = serial_reg_ch2->rx_buf_timer =
93                        0;
94                serial_reg_ch1->rx_char_timer = serial_reg_ch2->rx_char_timer =
95                        NETARM_SER_RXGAP (gd->baudrate);
96        } else {
97                hang ();
98        }
99
100        /* setup port mode */
101        serial_reg_ch1->ctrl_b = serial_reg_ch2->ctrl_b =
102                ( NETARM_SER_CTLB_RCGT_EN |
103                  NETARM_SER_CTLB_UART_MODE);
104        serial_reg_ch1->ctrl_a = serial_reg_ch2->ctrl_a =
105                ( NETARM_SER_CTLA_ENABLE |
106                  NETARM_SER_CTLA_P_NONE |
107                  /* see errata */
108                  NETARM_SER_CTLA_2STOP |
109                  NETARM_SER_CTLA_8BITS |
110                  NETARM_SER_CTLA_DTR_EN |
111                  NETARM_SER_CTLA_RTS_EN);
112}
113
114
115/*
116 * Initialise the serial port with the given baudrate. The settings
117 * are always 8 data bits, no parity, 1 stop bit, no start bits.
118 */
119int serial_init (void)
120{
121        serial_setbrg ();
122        return 0;
123}
124
125
126/*
127 * Output a single byte to the serial port.
128 */
129void serial_putc (const char c)
130{
131        volatile unsigned char *fifo;
132
133        /* If \n, also do \r */
134        if (c == '\n')
135                serial_putc ('\r');
136
137        fifo = (volatile unsigned char *) &(serial_reg_ch1->fifo);
138        TXWAITRDY (serial_reg_ch1);
139        *fifo = c;
140}
141
142/*
143 * Test of a single byte from the serial port. Returns 1 on success, 0
144 * otherwise.
145 */
146int serial_tstc(void)
147{
148        return serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY;
149}
150
151/*
152 * Read a single byte from the serial port. Returns 1 on success, 0
153 * otherwise.
154 */
155int serial_getc (void)
156{
157        unsigned int ch_uint;
158        volatile unsigned int *fifo;
159        volatile unsigned char *fifo_char = NULL;
160        int buf_count = 0;
161
162        while (!(serial_reg_ch1->status_a & NETARM_SER_STATA_RX_RDY))
163                /* NOP */ ;
164
165        fifo = (volatile unsigned int *) &(serial_reg_ch1->fifo);
166        fifo_char = (unsigned char *) &ch_uint;
167        ch_uint = *fifo;
168
169        buf_count = NETARM_SER_STATA_RXFDB (serial_reg_ch1->status_a);
170        switch (buf_count) {
171        case NETARM_SER_STATA_RXFDB_4BYTES:
172                buf_count = 4;
173                break;
174        case NETARM_SER_STATA_RXFDB_3BYTES:
175                buf_count = 3;
176                break;
177        case NETARM_SER_STATA_RXFDB_2BYTES:
178                buf_count = 2;
179                break;
180        case NETARM_SER_STATA_RXFDB_1BYTES:
181                buf_count = 1;
182                break;
183        default:
184                /* panic, be never here */
185                break;
186        }
187
188        serial_reg_ch1->status_a |= NETARM_SER_STATA_RX_CLOSED;
189
190        return ch_uint & 0xff;
191}
192
193void serial_puts (const char *s)
194{
195        while (*s) {
196                serial_putc (*s++);
197        }
198}
199
200#endif /* CONFIG_NETARM */
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