4 * Hardcoded to UART 0 for now
5 * Speed and options also hardcoded to 115200 8N1
7 * Copyright (c) 2003 Thomas.Lange@corelatus.se
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 #include <asm/au1x00.h>
35 /******************************************************************************
37 * serial_init - initialize a channel
39 * This routine initializes the number of data bits, parity
40 * and set the selected baud rate. Interrupts are disabled.
41 * Set the modem control signals if the option is selected.
46 int serial_init (void)
48 volatile u32 *uart_fifoctl = (volatile u32*)(UART0_ADDR+UART_FCR);
49 volatile u32 *uart_enable = (volatile u32*)(UART0_ADDR+UART_ENABLE);
51 /* Enable clocks first */
52 *uart_enable = UART_EN_CE;
54 /* Then release reset */
55 /* Must release reset before setting other regs */
56 *uart_enable = UART_EN_CE|UART_EN_E;
58 /* Activate fifos, reset tx and rx */
59 /* Set tx trigger level to 12 */
60 *uart_fifoctl = UART_FCR_ENABLE_FIFO|UART_FCR_CLEAR_RCVR|
61 UART_FCR_CLEAR_XMIT|UART_FCR_T_TRIGGER_12;
69 void serial_setbrg (void)
71 volatile u32 *uart_clk = (volatile u32*)(UART0_ADDR+UART_CLK);
72 volatile u32 *uart_lcr = (volatile u32*)(UART0_ADDR+UART_LCR);
74 /* Set baudrate to 115200 */
77 /* Set parity, stop bits and word length to 8N1 */
78 *uart_lcr = UART_LCR_WLEN8;
81 void serial_putc (const char c)
83 volatile u32 *uart_lsr = (volatile u32*)(UART0_ADDR+UART_LSR);
84 volatile u32 *uart_tx = (volatile u32*)(UART0_ADDR+UART_TX);
86 if (c == '\n') serial_putc ('\r');
88 /* Wait for fifo to shift out some bytes */
89 while((*uart_lsr&UART_LSR_THRE)==0);
94 void serial_puts (const char *s)
102 int serial_getc (void)
104 volatile u32 *uart_rx = (volatile u32*)(UART0_ADDR+UART_RX);
107 while (!serial_tstc());
113 int serial_tstc (void)
115 volatile u32 *uart_lsr = (volatile u32*)(UART0_ADDR+UART_LSR);
117 if(*uart_lsr&UART_LSR_DR){
123 #endif /* CONFIG_SERIAL_AU1X00 */