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/*
 * cpu/spc300/serial.c
 *
 * Copyright (C) 2009 SPiDCOM Technologies
 *
 * 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>
#include <config.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/ips/uart.h>

#if !defined(CONFIG_USART0)
#error must define CONFIG_USART0
#endif

/**
 * Function:     serial_setbrg
 * Parameters:   void
 * Purpose:      Set baudrate
 * Return Value: void
 */
void serial_setbrg (void)
{
	DECLARE_GLOBAL_DATA_PTR;
	int baudrate;
	int baud_divisor;

	if ((baudrate = gd->baudrate) <= 0)
		baudrate = CONFIG_BAUDRATE;

	baud_divisor = (get_master_clock((gd_t*)gd) + 8*baudrate) / (16 * baudrate);
	writel(readl(UART_LCR_1) | 0x80, UART_LCR_1);
	writel(baud_divisor & 0x00ff, UART_DLL_1);
	writel((baud_divisor & 0xff00) >> 8, UART_DLH_1);
	writel(readl(UART_LCR_1) & ~0x80, UART_LCR_1);
} /* serial_setbrg */


/**
 * Function:     serial_init
 * Parameters:   void
 * Purpose:      Initilize serial
 * Return Value: int
 */
int serial_init (void)
{
	/* disable interrupts */
	writel(0, UART_IER_1);
	/* set mode 8 bits, 1 stop, no parity */
	writel(UART_DLS_8, UART_LCR_1);
	/* set FIFO RX & TX to half trigger */
	writel(UART_RT_HALF | UART_TET_QUARTER | UART_XFIFOR | UART_RFIFOR | UART_FIFOE, UART_FCR_1);

	serial_setbrg ();
	return (0);
} /* serial_init */

/**
 * Function:     serial_putc
 * Parameters:   const char c
 * Purpose:      Send character on serial
 * Return Value: 
 */
void serial_putc (const char c)
{

	if (c == '\n')
		serial_putc ('\r');
	while(!(readl(UART_LSR_1) & UART_TEMT));
	writel(c, UART_THR_1);
} /* serial_putc */

/**
 * Function:     serial_puts
 * Parameters:   const char *s
 * Purpose:      Send string on serial
 * Return Value: void
 */
void serial_puts (const char *s)
{
	while (*s) {
		serial_putc (*s++);
	}
} /* serial_puts */

/**
 * Function:     serial_getc
 * Parameters:   void
 * Purpose:      Receive character
 * Return Value: int
 */
int serial_getc (void)
{
	int val;

	while(!(readl(UART_LSR_1) & UART_DR));
	val = readl(UART_RBR_1);

	return val;
} /* serial_getc */

/**
 * Function:     serial_tstc
 * Parameters:   void
 * Purpose:      Test if a character is received
 * Return Value: int
 */
int serial_tstc (void)
{
	if(readl(UART_LSR_1) & UART_DR)
		return 1;
	else
		return 0;
} /* serial_tstc */