drivers/serial/serial_xuartlite.c

   1 /*
   2  * (C) Copyright 2004 Atmark Techno, Inc.
   3  *
   4  * Yasushi SHOJI <yashi@atmark-techno.com>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <config.h>
  26
  27 #ifdef  CONFIG_XILINX_UARTLITE
  28
  29 #include <asm/serial_xuartlite.h>
  30
  31 /* FIXME: we should convert these to in32 and out32 */
  32 #define IO_WORD(offset)      (*(volatile unsigned long *)(offset))
  33 #define IO_SERIAL(offset)    IO_WORD(CONFIG_SERIAL_BASE + (offset))
  34
  35 #define IO_SERIAL_RX_FIFO   IO_SERIAL(XUL_RX_FIFO_OFFSET)
  36 #define IO_SERIAL_TX_FIFO   IO_SERIAL(XUL_TX_FIFO_OFFSET)
  37 #define IO_SERIAL_STATUS    IO_SERIAL(XUL_STATUS_REG_OFFSET)
  38 #define IO_SERIAL_CONTROL   IO_SERIAL(XUL_CONTROL_REG_OFFSET)
  39
  40 int serial_init(void)
  41 {
  42         /* FIXME: Nothing for now. We should initialize fifo, etc */
  43         return 0;
  44 }
  45
  46 void serial_setbrg(void)
  47 {
  48         /* FIXME: what's this for? */
  49 }
  50
  51 void serial_putc(const char c)
  52 {
  53         if (c == '\n') serial_putc('\r');
  54         while (IO_SERIAL_STATUS & XUL_SR_TX_FIFO_FULL);
  55         IO_SERIAL_TX_FIFO = (unsigned char) (c & 0xff);
  56 }
  57
  58 void serial_puts(const char * s)
  59 {
  60         while (*s) {
  61                 serial_putc(*s++);
  62         }
  63 }
  64
  65 int serial_getc(void)
  66 {
  67         while (!(IO_SERIAL_STATUS & XUL_SR_RX_FIFO_VALID_DATA));
  68         return IO_SERIAL_RX_FIFO & 0xff;
  69 }
  70
  71 int serial_tstc(void)
  72 {
  73         return (IO_SERIAL_STATUS & XUL_SR_RX_FIFO_VALID_DATA);
  74 }
  75
  76 #endif  /* CONFIG_MICROBLZE */