172 lines
3.7 KiB
C
172 lines
3.7 KiB
C
/*
|
|
* (C) Copyright 2000
|
|
* Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
|
|
*
|
|
* (C) Copyright 2004
|
|
* ARM Ltd.
|
|
* Philippe Robin, <philippe.robin@arm.com>
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/* Simple U-Boot driver for the PrimeCell PL011 UARTs on the IntegratorCP */
|
|
/* Should be fairly simple to make it work with the PL010 as well */
|
|
|
|
#include <common.h>
|
|
|
|
#ifdef CFG_PL010_SERIAL
|
|
|
|
#include "serial_pl011.h"
|
|
|
|
#define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
|
|
#define IO_READ(addr) (*(volatile unsigned int *)(addr))
|
|
|
|
/* Integrator AP has two UARTs, we use the first one, at 38400-8-N-1 */
|
|
#define CONSOLE_PORT CONFIG_CONS_INDEX
|
|
#define baudRate CONFIG_BAUDRATE
|
|
static volatile unsigned char *const port[] = CONFIG_PL01x_PORTS;
|
|
#define NUM_PORTS (sizeof(port)/sizeof(port[0]))
|
|
|
|
|
|
static void pl010_putc (int portnum, char c);
|
|
static int pl010_getc (int portnum);
|
|
static int pl010_tstc (int portnum);
|
|
|
|
|
|
int serial_init (void)
|
|
{
|
|
unsigned int divisor;
|
|
|
|
/*
|
|
** First, disable everything.
|
|
*/
|
|
IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, 0x0);
|
|
|
|
/*
|
|
** Set baud rate
|
|
**
|
|
*/
|
|
switch (baudRate) {
|
|
case 9600:
|
|
divisor = UART_PL010_BAUD_9600;
|
|
break;
|
|
|
|
case 19200:
|
|
divisor = UART_PL010_BAUD_9600;
|
|
break;
|
|
|
|
case 38400:
|
|
divisor = UART_PL010_BAUD_38400;
|
|
break;
|
|
|
|
case 57600:
|
|
divisor = UART_PL010_BAUD_57600;
|
|
break;
|
|
|
|
case 115200:
|
|
divisor = UART_PL010_BAUD_115200;
|
|
break;
|
|
|
|
default:
|
|
divisor = UART_PL010_BAUD_38400;
|
|
}
|
|
|
|
IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRM,
|
|
((divisor & 0xf00) >> 8));
|
|
IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRL, (divisor & 0xff));
|
|
|
|
/*
|
|
** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
|
|
*/
|
|
IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRH,
|
|
(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN));
|
|
|
|
/*
|
|
** Finally, enable the UART
|
|
*/
|
|
IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, (UART_PL010_CR_UARTEN));
|
|
|
|
return (0);
|
|
}
|
|
|
|
void serial_putc (const char c)
|
|
{
|
|
if (c == '\n')
|
|
pl010_putc (CONSOLE_PORT, '\r');
|
|
|
|
pl010_putc (CONSOLE_PORT, c);
|
|
}
|
|
|
|
void serial_puts (const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc (*s++);
|
|
}
|
|
}
|
|
|
|
int serial_getc (void)
|
|
{
|
|
return pl010_getc (CONSOLE_PORT);
|
|
}
|
|
|
|
int serial_tstc (void)
|
|
{
|
|
return pl010_tstc (CONSOLE_PORT);
|
|
}
|
|
|
|
void serial_setbrg (void)
|
|
{
|
|
}
|
|
|
|
static void pl010_putc (int portnum, char c)
|
|
{
|
|
/* Wait until there is space in the FIFO */
|
|
while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF);
|
|
|
|
/* Send the character */
|
|
IO_WRITE (port[portnum] + UART_PL01x_DR, c);
|
|
}
|
|
|
|
static int pl010_getc (int portnum)
|
|
{
|
|
unsigned int data;
|
|
|
|
/* Wait until there is data in the FIFO */
|
|
while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE);
|
|
|
|
data = IO_READ (port[portnum] + UART_PL01x_DR);
|
|
|
|
/* Check for an error flag */
|
|
if (data & 0xFFFFFF00) {
|
|
/* Clear the error */
|
|
IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
|
|
return -1;
|
|
}
|
|
|
|
return (int) data;
|
|
}
|
|
|
|
static int pl010_tstc (int portnum)
|
|
{
|
|
return !(IO_READ (port[portnum] + UART_PL01x_FR) &
|
|
UART_PL01x_FR_RXFE);
|
|
}
|
|
|
|
#endif
|