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initial bits of bootldr port to the Simtec's EB110ATX 'CATS' evaluation boards.

/*
 * $Id: cons_footbridge.c,v 1.1 2008/07/17 18:10:36 nbrk Exp $
 */
/*
 * DC21285 'footbridge' USART for bootldr boot messages.
 * TODO: baud rate.
 */
#include <sys/types.h>

#define CSR_BASE	0x42000000
#define  UARTDR	0x160	/* data register */
#define  H_UBRLCR	0x168	/* baud rate, line control register */
#define  M_UBRLCR	0x16c	/* baud rate divisor (high) */
#define  L_UBRLCR	0x170	/* baud rate divisor (low) */
#define  UARTCON	0x174	/* control register */
#define  UARTFLG	0x178	/* FIFO status */

void	fuart_write(uint16_t reg, uint8_t data);
uint8_t	fuart_read(uint16_t reg);


void
fuart_write(uint16_t reg, uint8_t data)
{
	*(volatile uint32_t *)(CSR_BASE + reg) = data;
}


uint8_t
fuart_read(uint16_t reg)
{
	return( *(volatile uint32_t *)(CSR_BASE + reg));
}


int
bootcons_init(void)
{
	/* XXX set operation mode */
	fuart_write(H_UBRLCR, 0x60 /*8bits*/);

	/* enable UART */
	fuart_write(UARTCON, 1);

	return(0);
}


void
bootcons_putc(int uartno, int c)
{
	while(fuart_read(UARTFLG) & 0x08 /*TXBSY*/)
		;

	fuart_write(UARTDR, (uint8_t)c);
}