LXR linux/arch/mips/jz4740/serial.c

   1/*
   2 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3 *  JZ4740 serial support
   4 *
   5 *  This program is free software; you can redistribute  it and/or modify it
   6 *  under  the terms of  the GNU General  Public License as published by the
   7 *  Free Software Foundation;  either version 2 of the  License, or (at your
   8 *  option) any later version.
   9 *
  10 *  You should have received a copy of the  GNU General Public License along
  11 *  with this program; if not, write  to the Free Software Foundation, Inc.,
  12 *  675 Mass Ave, Cambridge, MA 02139, USA.
  13 *
  14 */
  15
  16#include <linux/io.h>
  17#include <linux/serial_core.h>
  18#include <linux/serial_reg.h>
  19
  20void jz4740_serial_out(struct uart_port *p, int offset, int value)
  21{
  22        switch (offset) {
  23        case UART_FCR:
  24                value |= 0x10; /* Enable uart module */
  25                break;
  26        case UART_IER:
  27                value |= (value & 0x4) << 2;
  28                break;
  29        default:
  30                break;
  31        }
  32        writeb(value, p->membase + (offset << p->regshift));
  33}
  34