target/linux/adm5120/files-3.14/arch/mips/adm5120/common/early-printk.c

   1 /*
   2  *  ADM5120 specific early printk support
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/io.h>
  14
  15 #include <asm/addrspace.h>
  16 #include <asm/mach-adm5120/adm5120_defs.h>
  17 #include <asm/mach-adm5120/adm5120_uart.h>
  18
  19 #define UART_READ(r) \
  20         __raw_readl((void __iomem *)(KSEG1ADDR(ADM5120_UART0_BASE)+(r)))
  21 #define UART_WRITE(r, v) \
  22         __raw_writel((v), (void __iomem *)(KSEG1ADDR(ADM5120_UART0_BASE)+(r)))
  23
  24 void __init prom_putchar(char ch)
  25 {
  26         while ((UART_READ(UART_REG_FLAG) & UART_FLAG_TXFE) == 0)
  27                 ;
  28         UART_WRITE(UART_REG_DATA, ch);
  29         while ((UART_READ(UART_REG_FLAG) & UART_FLAG_TXFE) == 0)
  30                 ;
  31 }