arch/mips/bcm63xx/early_printk.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  */
   8
   9 #include <bcm63xx_io.h>
  10 #include <linux/serial_bcm63xx.h>
  11
  12 static void wait_xfered(void)
  13 {
  14         unsigned int val;
  15
  16         /* wait for any previous char to be transmitted */
  17         do {
  18                 val = bcm_uart0_readl(UART_IR_REG);
  19                 if (val & UART_IR_STAT(UART_IR_TXEMPTY))
  20                         break;
  21         } while (1);
  22 }
  23
  24 void prom_putchar(char c)
  25 {
  26         wait_xfered();
  27         bcm_uart0_writel(c, UART_FIFO_REG);
  28         wait_xfered();
  29 }