release/src-rt-6.x/linux/linux-2.6/arch/ppc/boot/simple/uartlite_tty.c

   1 /*
   2  * Xilinx UARTLITE bootloader driver
   3  *
   4  * Copyright (c) 2007 Secret Lab Technologies Ltd.
   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 as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/types.h>
  13 #include <asm/serial.h>
  14 #include <asm/io.h>
  15 #include <platforms/4xx/xparameters/xparameters.h>
  16
  17 #define UARTLITE_BASEADDR ((void*)(XPAR_UARTLITE_0_BASEADDR))
  18
  19 void
  20 serial_putc(unsigned long com_port, unsigned char c)
  21 {
  22         while ((in_be32(UARTLITE_BASEADDR + 0x8) & 0x08) != 0); /* spin */
  23         out_be32(UARTLITE_BASEADDR + 0x4, c);
  24 }
  25
  26 unsigned char
  27 serial_getc(unsigned long com_port)
  28 {
  29         while ((in_be32(UARTLITE_BASEADDR + 0x8) & 0x01) == 0); /* spin */
  30         return in_be32(UARTLITE_BASEADDR);
  31 }
  32
  33 int
  34 serial_tstc(unsigned long com_port)
  35 {
  36         return ((in_be32(UARTLITE_BASEADDR + 0x8) & 0x01) != 0);
  37 }