82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
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* (C) Copyright 2008 Michal Simek <monstr@monstr.eu>
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* Clean driver and add xilinx constant from header file
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*
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* (C) Copyright 2004 Atmark Techno, Inc.
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* Yasushi SHOJI <yashi@atmark-techno.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <asm/io.h>
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#ifdef CONFIG_XILINX_UARTLITE
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#define RX_FIFO_OFFSET 0 /* receive FIFO, read only */
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#define TX_FIFO_OFFSET 4 /* transmit FIFO, write only */
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#define STATUS_REG_OFFSET 8 /* status register, read only */
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#define SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */
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#define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */
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#define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */
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#define UARTLITE_STATUS (CONFIG_SERIAL_BASE + STATUS_REG_OFFSET)
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#define UARTLITE_TX_FIFO (CONFIG_SERIAL_BASE + TX_FIFO_OFFSET)
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#define UARTLITE_RX_FIFO (CONFIG_SERIAL_BASE + RX_FIFO_OFFSET)
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int serial_init(void)
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{
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/* FIXME: Nothing for now. We should initialize fifo, etc */
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return 0;
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}
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void serial_setbrg(void)
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{
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/* FIXME: what's this for? */
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}
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void serial_putc(const char c)
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{
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if (c == '\n')
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serial_putc('\r');
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while (in_be32((u32 *) UARTLITE_STATUS) & SR_TX_FIFO_FULL);
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out_be32((u32 *) UARTLITE_TX_FIFO, (unsigned char) (c & 0xff));
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}
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void serial_puts(const char * s)
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{
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while (*s) {
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serial_putc(*s++);
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}
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}
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int serial_getc(void)
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{
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while (!(in_be32((u32 *) UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA));
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return in_be32((u32 *) UARTLITE_RX_FIFO) & 0xff;
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}
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int serial_tstc(void)
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{
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return (in_be32((u32 *) UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA);
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}
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#endif /* CONFIG_MICROBLZE */
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