early_printk.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008 Maxime Bizon <[email protected]>
 */

#include <linux/init.h>
#include <bcm63xx_io.h>
#include <bcm63xx_regs.h>

static void __init wait_xfered(void)
{
    unsigned int val;

    /* wait for any previous char to be transmitted */
    do {
        val = bcm_uart0_readl(UART_IR_REG);
        if (val & UART_IR_STAT(UART_IR_TXEMPTY))
            break;
    } while (1);
}

void __init prom_putchar(char c)
{
    wait_xfered();
    bcm_uart0_writel(c, UART_FIFO_REG);
    wait_xfered();
}