LXR linux/arch/mips/ath25/early

   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) 2010 Gabor Juhos <juhosg@openwrt.org>
   7 */
   8
   9#include <linux/mm.h>
  10#include <linux/io.h>
  11#include <linux/serial_reg.h>
  12#include <asm/setup.h>
  13
  14#include "devices.h"
  15#include "ar2315_regs.h"
  16#include "ar5312_regs.h"
  17
  18static inline void prom_uart_wr(void __iomem *base, unsigned reg,
  19                                unsigned char ch)
  20{
  21        __raw_writel(ch, base + 4 * reg);
  22}
  23
  24static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
  25{
  26        return __raw_readl(base + 4 * reg);
  27}
  28
  29void prom_putchar(char ch)
  30{
  31        static void __iomem *base;
  32
  33        if (unlikely(base == NULL)) {
  34                if (is_ar2315())
  35                        base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
  36                else
  37                        base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
  38        }
  39
  40        while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
  41                ;
  42        prom_uart_wr(base, UART_TX, (unsigned char)ch);
  43        while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
  44                ;
  45}
  46