3 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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.
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.
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
24 #if defined(CONFIG_CONSOLE_UART1)
25 # define UART_CONSOLE 1
26 #elif defined(CONFIG_CONSOLE_UART2)
27 # define UART_CONSOLE 2
28 #elif defined(CONFIG_CONSOLE_UART3)
29 # define UART_CONSOLE 3
31 # error "No console configured ... "
34 void serial_setbrg (void)
36 DECLARE_GLOBAL_DATA_PTR;
37 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
44 * BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1
46 * UART_REF_FREQ = external system clock input / 2 (Hz)
47 * BAUD is desired baudrate (bits/s)
49 * NOTE: we add (divisor/2) to numerator to round for
52 reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1;
55 for (i = 0; i < 100; i++);
59 * Initialise the serial port with the given baudrate. The settings
60 * are always 8 data bits, no parity, 1 stop bit, no start bits.
63 int serial_init (void)
65 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
67 /* UART must be enabled before writing to any config registers */
68 uart->con |= (UART_EN);
70 #ifdef CONFIG_CONSOLE_UART1
71 /* infrared disabled */
72 uart->con |= UART_SIRD;
74 /* loopback disabled */
75 uart->con &= ~(UART_LBE);
77 /* modem lines and tx/rx polarities */
78 uart->con &= ~(UART_MXP | UART_TXP | UART_RXP);
80 /* FIFO enable, N81 */
81 uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1);
86 /* enable rx interrupt */
87 uart->inten |= UART_RI;
93 * Read a single byte from the serial port. Returns 1 on success, 0
94 * otherwise. When the function is succesfull, the character read is
95 * written into its argument c.
97 int serial_getc (void)
99 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
101 /* wait for character to arrive */
102 while (uart->status & UART_RXFE);
104 return(uart->data & 0xff);
108 static int hwflow = 0; /* turned off by default */
109 int hwflow_onoff(int on)
114 break; /* return current */
116 hwflow = 1; /* turn on */
119 hwflow = 0; /* turn off */
126 #ifdef CONFIG_MODEM_SUPPORT
127 static int be_quiet = 0;
128 void disable_putc(void)
133 void enable_putc(void)
141 * Output a single byte to the serial port.
143 void serial_putc (const char c)
145 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
147 #ifdef CONFIG_MODEM_SUPPORT
152 /* wait for room in the tx FIFO */
153 while (!(uart->status & UART_TXFE));
156 /* Wait for CTS up */
157 while(hwflow && !(uart->status & UART_CTS));
162 /* If \n, also do \r */
168 * Test whether a character is in the RX buffer
170 int serial_tstc (void)
172 lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
174 return(!(uart->status & UART_RXFE));
178 serial_puts (const char *s)