]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/serial_lh7a40x.c
3 * Gary Jennejohn, DENX Software Engineering, <garyj@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 DECLARE_GLOBAL_DATA_PTR
;
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
33 # error "No console configured ... "
36 void serial_setbrg (void)
38 lh7a40x_uart_t
* uart
= LH7A40X_UART_PTR(UART_CONSOLE
);
45 * BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1
47 * UART_REF_FREQ = external system clock input / 2 (Hz)
48 * BAUD is desired baudrate (bits/s)
50 * NOTE: we add (divisor/2) to numerator to round for
53 reg
= (((get_PLLCLK()/2) + ((16*gd
->baudrate
)/2)) / (16 * gd
->baudrate
)) - 1;
56 for (i
= 0; i
< 100; i
++);
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.
64 int serial_init (void)
66 lh7a40x_uart_t
* uart
= LH7A40X_UART_PTR(UART_CONSOLE
);
68 /* UART must be enabled before writing to any config registers */
69 uart
->con
|= (UART_EN
);
71 #ifdef CONFIG_CONSOLE_UART1
72 /* infrared disabled */
73 uart
->con
|= UART_SIRD
;
75 /* loopback disabled */
76 uart
->con
&= ~(UART_LBE
);
78 /* modem lines and tx/rx polarities */
79 uart
->con
&= ~(UART_MXP
| UART_TXP
| UART_RXP
);
81 /* FIFO enable, N81 */
82 uart
->fcon
= (UART_WLEN_8
| UART_FEN
| UART_STP2_1
);
87 /* enable rx interrupt */
88 uart
->inten
|= UART_RI
;
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.
98 int serial_getc (void)
100 lh7a40x_uart_t
* uart
= LH7A40X_UART_PTR(UART_CONSOLE
);
102 /* wait for character to arrive */
103 while (uart
->status
& UART_RXFE
);
105 return(uart
->data
& 0xff);
109 static int hwflow
= 0; /* turned off by default */
110 int hwflow_onoff(int on
)
115 break; /* return current */
117 hwflow
= 1; /* turn on */
120 hwflow
= 0; /* turn off */
127 #ifdef CONFIG_MODEM_SUPPORT
128 static int be_quiet
= 0;
129 void disable_putc(void)
134 void enable_putc(void)
142 * Output a single byte to the serial port.
144 void serial_putc (const char c
)
146 lh7a40x_uart_t
* uart
= LH7A40X_UART_PTR(UART_CONSOLE
);
148 #ifdef CONFIG_MODEM_SUPPORT
153 /* wait for room in the tx FIFO */
154 while (!(uart
->status
& UART_TXFE
));
157 /* Wait for CTS up */
158 while(hwflow
&& !(uart
->status
& UART_CTS
));
163 /* If \n, also do \r */
169 * Test whether a character is in the RX buffer
171 int serial_tstc (void)
173 lh7a40x_uart_t
* uart
= LH7A40X_UART_PTR(UART_CONSOLE
);
175 return(!(uart
->status
& UART_RXFE
));
179 serial_puts (const char *s
)