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/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* 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_ATMEL_USART
#include <asm/io.h>
#include <asm/arch/platform.h>
#include "atmel_usart.h"
DECLARE_GLOBAL_DATA_PTR;
void serial_setbrg(void)
{
unsigned long divisor;
unsigned long usart_hz;
/*
* Master Clock
* Baud Rate = --------------
* 16 * CD
*/
usart_hz = pm_get_clock_freq(gd->console_uart->resource[0].u.clock.id);
divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
usart3_writel(gd->console_uart, BRGR, USART3_BF(CD, divisor));
}
int serial_init(void)
{
usart3_writel(gd->console_uart, CR,
USART3_BIT(RSTRX) | USART3_BIT(RSTTX));
serial_setbrg();
usart3_writel(gd->console_uart, CR,
USART3_BIT(RXEN) | USART3_BIT(TXEN));
usart3_writel(gd->console_uart, MR,
USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
| USART3_BF(USCLKS, USART3_USCLKS_MCK)
| USART3_BF(CHRL, USART3_CHRL_8)
| USART3_BF(PAR, USART3_PAR_NONE)
| USART3_BF(NBSTOP, USART3_NBSTOP_1));
return 0;
}
void serial_putc(char c)
{
if (c == '\n')
serial_putc('\r');
while (!(usart3_readl(gd->console_uart, CSR) & USART3_BIT(TXRDY))) ;
usart3_writel(gd->console_uart, THR, c);
}
void serial_puts(const char *s)
{
while (*s)
serial_putc(*s++);
}
int serial_getc(void)
{
while (!(usart3_readl(gd->console_uart, CSR) & USART3_BIT(RXRDY))) ;
return usart3_readl(gd->console_uart, RHR);
}
int serial_tstc(void)
{
return (usart3_readl(gd->console_uart, CSR) & USART3_BIT(RXRDY)) != 0;
}
#endif /* CONFIG_ATMEL_USART */