179 lines
3.6 KiB
C
179 lines
3.6 KiB
C
/*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
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#include <s3c2400.h>
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#elif defined(CONFIG_S3C2410)
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#include <s3c2410.h>
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#endif
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#ifdef CONFIG_SERIAL1
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#define UART_NR S3C24X0_UART0
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#elif CONFIG_SERIAL2
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# if defined(CONFIG_TRAB)
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# error "TRAB supports only CONFIG_SERIAL1"
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# endif
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#define UART_NR S3C24X0_UART1
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#elif CONFIG_SERIAL3
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# if defined(CONFIG_TRAB)
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# #error "TRAB supports only CONFIG_SERIAL1"
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# endif
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#define UART_NR S3C24X0_UART2
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#else
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#error "Bad: you didn't configure serial ..."
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#endif
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void serial_setbrg (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
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int i;
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unsigned int reg = 0;
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/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
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reg = get_PCLK() / (16 * gd->baudrate) - 1;
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/* FIFO enable, Tx/Rx FIFO clear */
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uart->UFCON = 0x07;
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uart->UMCON = 0x0;
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/* Normal,No parity,1 stop,8 bit */
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uart->ULCON = 0x3;
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/*
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* tx=level,rx=edge,disable timeout int.,enable rx error int.,
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* normal,interrupt or polling
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*/
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uart->UCON = 0x245;
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uart->UBRDIV = reg;
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#ifdef CONFIG_HWFLOW
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uart->UMCON = 0x1; /* RTS up */
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#endif
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for (i = 0; i < 100; i++);
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*
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*/
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int serial_init (void)
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{
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serial_setbrg ();
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return (0);
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int serial_getc (void)
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{
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S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
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/* wait for character to arrive */
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while (!(uart->UTRSTAT & 0x1));
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return uart->URXH & 0xff;
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}
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#ifdef CONFIG_HWFLOW
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static int hwflow = 0; /* turned off by default */
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int hwflow_onoff(int on)
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{
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switch(on) {
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case 0:
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default:
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break; /* return current */
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case 1:
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hwflow = 1; /* turn on */
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break;
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case -1:
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hwflow = 0; /* turn off */
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break;
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}
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return hwflow;
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}
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#endif
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#ifdef CONFIG_MODEM_SUPPORT
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static int be_quiet = 0;
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void disable_putc(void)
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{
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be_quiet = 1;
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}
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void enable_putc(void)
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{
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be_quiet = 0;
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}
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#endif
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/*
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* Output a single byte to the serial port.
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*/
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void serial_putc (const char c)
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{
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S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
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#ifdef CONFIG_MODEM_SUPPORT
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if (be_quiet)
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return;
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#endif
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/* wait for room in the tx FIFO */
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while (!(uart->UTRSTAT & 0x2));
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#ifdef CONFIG_HWFLOW
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/* Wait for CTS up */
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while(hwflow && !(uart->UMSTAT & 0x1))
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;
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#endif
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uart->UTXH = c;
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/* If \n, also do \r */
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if (c == '\n')
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serial_putc ('\r');
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}
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/*
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* Test whether a character is in the RX buffer
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*/
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int serial_tstc (void)
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{
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S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
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return uart->UTRSTAT & 0x1;
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}
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void
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serial_puts (const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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}
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