1 /*
2 * (C) Copyright 2002
3 * Gary Jennejohn, DENX Software Engineering, <garyj@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
24 DECLARE_GLOBAL_DATA_PTR;
25
26 #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
serial_setbrg(void)36 void serial_setbrg (void)
37 {
38 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
39 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 */
serial_init(void)64 int serial_init (void)
65 {
66 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
67
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 */
serial_getc(void)98 int serial_getc (void)
99 {
100 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
101
102 /* wait for character to arrive */
103 while (uart->status & UART_RXFE);
104
105 return(uart->data & 0xff);
106 }
107
108 #ifdef CONFIG_HWFLOW
109 static int hwflow = 0; /* turned off by default */
hwflow_onoff(int on)110 int 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
128 static int be_quiet = 0;
disable_putc(void)129 void disable_putc(void)
130 {
131 be_quiet = 1;
132 }
133
enable_putc(void)134 void enable_putc(void)
135 {
136 be_quiet = 0;
137 }
138 #endif
139
140
141 /*
142 * Output a single byte to the serial port.
143 */
serial_putc(const char c)144 void serial_putc (const char c)
145 {
146 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
147
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 */
serial_tstc(void)171 int serial_tstc (void)
172 {
173 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
174
175 return(!(uart->status & UART_RXFE));
176 }
177
178 void
serial_puts(const char * s)179 serial_puts (const char *s)
180 {
181 while (*s) {
182 serial_putc (*s++);
183 }
184 }
185