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/*
* (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
*
* (C) Copyright 2009 Freescale Semiconductor, Inc.
*
* 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>
#ifdef CONFIG_STMP3XXX_DBGUART
#include "stmp3xxx_dbguart.h"
DECLARE_GLOBAL_DATA_PTR;
/*
* Set baud rate. The settings are always 8n1:
* 8 data bits, no parity, 1 stop bit
*/
void serial_setbrg(void)
{
u32 cr, lcr_h;
u32 quot;
/* Disable everything */
cr = REG_RD(DBGUART_BASE + UARTDBGCR);
REG_WR(DBGUART_BASE + UARTDBGCR, 0);
/* Calculate and set baudrate */
quot = (CONFIG_DBGUART_CLK * 4) / gd->baudrate;
REG_WR(DBGUART_BASE + UARTDBGFBRD, quot & 0x3f);
REG_WR(DBGUART_BASE + UARTDBGIBRD, quot >> 6);
/* Set 8n1 mode, enable FIFOs */
lcr_h = WLEN8 | FEN;
REG_WR(DBGUART_BASE + UARTDBGLCR_H, lcr_h);
/* Enable Debug UART */
REG_WR(DBGUART_BASE + UARTDBGCR, cr);
}
int serial_init(void)
{
u32 cr;
/* Disable UART */
REG_WR(DBGUART_BASE + UARTDBGCR, 0);
/* Mask interrupts */
REG_WR(DBGUART_BASE + UARTDBGIMSC, 0);
/* Set default baudrate */
serial_setbrg();
/* Enable UART */
cr = TXE | RXE | UARTEN;
REG_WR(DBGUART_BASE + UARTDBGCR, cr);
return 0;
}
/* Send a character */
void serial_putc(const char c)
{
/* Wait for room in TX FIFO */
while (REG_RD(DBGUART_BASE + UARTDBGFR) & TXFF)
;
/* Write the data byte */
REG_WR(DBGUART_BASE + UARTDBGDR, c);
if (c == '\n')
serial_putc('\r');
}
void serial_puts(const char *s)
{
while (*s) {
serial_putc(*s++);
}
}
/* Test whether a character is in TX buffer */
int serial_tstc(void)
{
/* Check if RX FIFO is not empty */
return !(REG_RD(DBGUART_BASE + UARTDBGFR) & RXFE);
}
/* Receive character */
int serial_getc(void)
{
/* Wait while TX FIFO is empty */
while (REG_RD(DBGUART_BASE + UARTDBGFR) & RXFE)
;
/* Read data byte */
return REG_RD(DBGUART_BASE + UARTDBGDR) & 0xff;
}
#endif /* CONFIG_STMP378X_DBGUART */
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