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wdenkf39748a2004-06-09 13:37:52 +00001/*
2 * (C) Copyright 2002
3 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21#include <common.h>
22#include <lh7a40x.h>
23
Wolfgang Denkd87080b2006-03-31 18:32:53 +020024DECLARE_GLOBAL_DATA_PTR;
25
wdenkf39748a2004-06-09 13:37:52 +000026#if defined(CONFIG_CONSOLE_UART1)
27# define UART_CONSOLE 1
28#elif defined(CONFIG_CONSOLE_UART2)
29# define UART_CONSOLE 2
30#elif defined(CONFIG_CONSOLE_UART3)
31# define UART_CONSOLE 3
32#else
33# error "No console configured ... "
34#endif
35
36void serial_setbrg (void)
37{
wdenkf832d8a2004-06-10 21:55:33 +000038 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
wdenkf39748a2004-06-09 13:37:52 +000039 int i;
40 unsigned int reg = 0;
41
42 /*
43 * userguide 15.1.2.4
44 *
45 * BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1
46 *
47 * UART_REF_FREQ = external system clock input / 2 (Hz)
48 * BAUD is desired baudrate (bits/s)
49 *
50 * NOTE: we add (divisor/2) to numerator to round for
51 * more precision
52 */
53 reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1;
54 uart->brcon = reg;
55
56 for (i = 0; i < 100; i++);
57}
58
59/*
60 * Initialise the serial port with the given baudrate. The settings
61 * are always 8 data bits, no parity, 1 stop bit, no start bits.
62 *
63 */
64int serial_init (void)
65{
wdenkf832d8a2004-06-10 21:55:33 +000066 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
wdenkf39748a2004-06-09 13:37:52 +000067
68 /* UART must be enabled before writing to any config registers */
69 uart->con |= (UART_EN);
70
71#ifdef CONFIG_CONSOLE_UART1
72 /* infrared disabled */
73 uart->con |= UART_SIRD;
74#endif
75 /* loopback disabled */
76 uart->con &= ~(UART_LBE);
77
78 /* modem lines and tx/rx polarities */
79 uart->con &= ~(UART_MXP | UART_TXP | UART_RXP);
80
81 /* FIFO enable, N81 */
82 uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1);
83
84 /* set baudrate */
85 serial_setbrg ();
86
87 /* enable rx interrupt */
88 uart->inten |= UART_RI;
89
90 return (0);
91}
92
93/*
94 * Read a single byte from the serial port. Returns 1 on success, 0
95 * otherwise. When the function is succesfull, the character read is
96 * written into its argument c.
97 */
98int serial_getc (void)
99{
wdenkf832d8a2004-06-10 21:55:33 +0000100 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
wdenkf39748a2004-06-09 13:37:52 +0000101
102 /* wait for character to arrive */
103 while (uart->status & UART_RXFE);
104
105 return(uart->data & 0xff);
106}
107
108#ifdef CONFIG_HWFLOW
109static int hwflow = 0; /* turned off by default */
110int hwflow_onoff(int on)
111{
112 switch(on) {
113 case 0:
114 default:
115 break; /* return current */
116 case 1:
117 hwflow = 1; /* turn on */
118 break;
119 case -1:
120 hwflow = 0; /* turn off */
121 break;
122 }
123 return hwflow;
124}
125#endif
126
127#ifdef CONFIG_MODEM_SUPPORT
128static int be_quiet = 0;
129void disable_putc(void)
130{
131 be_quiet = 1;
132}
133
134void enable_putc(void)
135{
136 be_quiet = 0;
137}
138#endif
139
140
141/*
142 * Output a single byte to the serial port.
143 */
144void serial_putc (const char c)
145{
wdenkf832d8a2004-06-10 21:55:33 +0000146 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
wdenkf39748a2004-06-09 13:37:52 +0000147
148#ifdef CONFIG_MODEM_SUPPORT
149 if (be_quiet)
150 return;
151#endif
152
153 /* wait for room in the tx FIFO */
154 while (!(uart->status & UART_TXFE));
155
156#ifdef CONFIG_HWFLOW
157 /* Wait for CTS up */
158 while(hwflow && !(uart->status & UART_CTS));
159#endif
160
161 uart->data = c;
162
163 /* If \n, also do \r */
164 if (c == '\n')
165 serial_putc ('\r');
166}
167
168/*
169 * Test whether a character is in the RX buffer
170 */
171int serial_tstc (void)
172{
wdenkf832d8a2004-06-10 21:55:33 +0000173 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
wdenkf39748a2004-06-09 13:37:52 +0000174
175 return(!(uart->status & UART_RXFE));
176}
177
178void
179serial_puts (const char *s)
180{
181 while (*s) {
182 serial_putc (*s++);
183 }
184}