mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 12:33:41 +00:00
183 lines
3.8 KiB
C
183 lines
3.8 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB)
|
|
|
|
#if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
|
|
#include <s3c2400.h>
|
|
#elif defined(CONFIG_S3C2410)
|
|
#include <s3c2410.h>
|
|
#endif
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#ifdef CONFIG_SERIAL1
|
|
#define UART_NR S3C24X0_UART0
|
|
|
|
#elif defined(CONFIG_SERIAL2)
|
|
# if defined(CONFIG_TRAB)
|
|
# error "TRAB supports only CONFIG_SERIAL1"
|
|
# endif
|
|
#define UART_NR S3C24X0_UART1
|
|
|
|
#elif defined(CONFIG_SERIAL3)
|
|
# if defined(CONFIG_TRAB)
|
|
# #error "TRAB supports only CONFIG_SERIAL1"
|
|
# endif
|
|
#define UART_NR S3C24X0_UART2
|
|
|
|
#else
|
|
#error "Bad: you didn't configure serial ..."
|
|
#endif
|
|
|
|
void serial_setbrg (void)
|
|
{
|
|
S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
|
|
int i;
|
|
unsigned int reg = 0;
|
|
|
|
/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
|
|
reg = get_PCLK() / (16 * gd->baudrate) - 1;
|
|
|
|
/* FIFO enable, Tx/Rx FIFO clear */
|
|
uart->UFCON = 0x07;
|
|
uart->UMCON = 0x0;
|
|
/* Normal,No parity,1 stop,8 bit */
|
|
uart->ULCON = 0x3;
|
|
/*
|
|
* tx=level,rx=edge,disable timeout int.,enable rx error int.,
|
|
* normal,interrupt or polling
|
|
*/
|
|
uart->UCON = 0x245;
|
|
uart->UBRDIV = reg;
|
|
|
|
#ifdef CONFIG_HWFLOW
|
|
uart->UMCON = 0x1; /* RTS up */
|
|
#endif
|
|
for (i = 0; i < 100; i++);
|
|
}
|
|
|
|
/*
|
|
* Initialise the serial port with the given baudrate. The settings
|
|
* are always 8 data bits, no parity, 1 stop bit, no start bits.
|
|
*
|
|
*/
|
|
int serial_init (void)
|
|
{
|
|
serial_setbrg ();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Read a single byte from the serial port. Returns 1 on success, 0
|
|
* otherwise. When the function is succesfull, the character read is
|
|
* written into its argument c.
|
|
*/
|
|
int serial_getc (void)
|
|
{
|
|
S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
|
|
|
|
/* wait for character to arrive */
|
|
while (!(uart->UTRSTAT & 0x1));
|
|
|
|
return uart->URXH & 0xff;
|
|
}
|
|
|
|
#ifdef CONFIG_HWFLOW
|
|
static int hwflow = 0; /* turned off by default */
|
|
int hwflow_onoff(int on)
|
|
{
|
|
switch(on) {
|
|
case 0:
|
|
default:
|
|
break; /* return current */
|
|
case 1:
|
|
hwflow = 1; /* turn on */
|
|
break;
|
|
case -1:
|
|
hwflow = 0; /* turn off */
|
|
break;
|
|
}
|
|
return hwflow;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_MODEM_SUPPORT
|
|
static int be_quiet = 0;
|
|
void disable_putc(void)
|
|
{
|
|
be_quiet = 1;
|
|
}
|
|
|
|
void enable_putc(void)
|
|
{
|
|
be_quiet = 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Output a single byte to the serial port.
|
|
*/
|
|
void serial_putc (const char c)
|
|
{
|
|
S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
|
|
#ifdef CONFIG_MODEM_SUPPORT
|
|
if (be_quiet)
|
|
return;
|
|
#endif
|
|
|
|
/* wait for room in the tx FIFO */
|
|
while (!(uart->UTRSTAT & 0x2));
|
|
|
|
#ifdef CONFIG_HWFLOW
|
|
/* Wait for CTS up */
|
|
while(hwflow && !(uart->UMSTAT & 0x1))
|
|
;
|
|
#endif
|
|
|
|
uart->UTXH = c;
|
|
|
|
/* If \n, also do \r */
|
|
if (c == '\n')
|
|
serial_putc ('\r');
|
|
}
|
|
|
|
/*
|
|
* Test whether a character is in the RX buffer
|
|
*/
|
|
int serial_tstc (void)
|
|
{
|
|
S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
|
|
|
|
return uart->UTRSTAT & 0x1;
|
|
}
|
|
|
|
void
|
|
serial_puts (const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc (*s++);
|
|
}
|
|
}
|
|
|
|
#endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */
|