LXR uboot/drivers/serial/serial

   1/*
   2 * (C) Copyright 2008 Michal Simek <monstr@monstr.eu>
   3 * Clean driver and add xilinx constant from header file
   4 *
   5 * (C) Copyright 2004 Atmark Techno, Inc.
   6 * Yasushi SHOJI <yashi@atmark-techno.com>
   7 *
   8 * See file CREDITS for list of people who contributed to this
   9 * project.
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public License as
  13 * published by the Free Software Foundation; either version 2 of
  14 * the License, or (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24 * MA 02111-1307 USA
  25 */
  26
  27#include <config.h>
  28#include <asm/io.h>
  29
  30#define RX_FIFO_OFFSET          0 /* receive FIFO, read only */
  31#define TX_FIFO_OFFSET          4 /* transmit FIFO, write only */
  32#define STATUS_REG_OFFSET       8 /* status register, read only */
  33
  34#define SR_TX_FIFO_FULL         0x08 /* transmit FIFO full */
  35#define SR_RX_FIFO_VALID_DATA   0x01 /* data in receive FIFO */
  36#define SR_RX_FIFO_FULL         0x02 /* receive FIFO full */
  37
  38#define UARTLITE_STATUS         (CONFIG_SERIAL_BASE + STATUS_REG_OFFSET)
  39#define UARTLITE_TX_FIFO        (CONFIG_SERIAL_BASE + TX_FIFO_OFFSET)
  40#define UARTLITE_RX_FIFO        (CONFIG_SERIAL_BASE + RX_FIFO_OFFSET)
  41
  42int serial_init(void)
  43{
  44        /* FIXME: Nothing for now. We should initialize fifo, etc */
  45        return 0;
  46}
  47
  48void serial_setbrg(void)
  49{
  50        /* FIXME: what's this for? */
  51}
  52
  53void serial_putc(const char c)
  54{
  55        if (c == '\n')
  56                serial_putc('\r');
  57        while (in_be32((u32 *) UARTLITE_STATUS) & SR_TX_FIFO_FULL);
  58        out_be32((u32 *) UARTLITE_TX_FIFO, (unsigned char) (c & 0xff));
  59}
  60
  61void serial_puts(const char * s)
  62{
  63        while (*s) {
  64                serial_putc(*s++);
  65        }
  66}
  67
  68int serial_getc(void)
  69{
  70        while (!(in_be32((u32 *) UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA));
  71        return in_be32((u32 *) UARTLITE_RX_FIFO) & 0xff;
  72}
  73
  74int serial_tstc(void)
  75{
  76        return (in_be32((u32 *) UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA);
  77}
  78