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
  20 void 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 }