99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/* $NetBSD: ns16550.c,v 1.5 2008/04/29 15:24:50 tsutsui Exp $ */
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/*-
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* Copyright (c) 2008 Izumi Tsutsui. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef CONS_SERIAL
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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#include <dev/ic/comreg.h>
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#include <machine/cpu.h>
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#include "boot.h"
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#include "ns16550.h"
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#define CSR_READ(base, reg) (*(volatile uint8_t *)((base) + (reg)))
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#define CSR_WRITE(base, reg, val) \
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do { \
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*(volatile uint8_t *)((base) + (reg)) = (val); \
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} while (/* CONSTCOND */ 0)
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void *
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com_init(int addr, int speed)
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{
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uint8_t *com_port;
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com_port = (void *)MIPS_PHYS_TO_KSEG1(COM_BASE + addr);
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CSR_WRITE(com_port, com_lctl, LCR_DLAB);
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speed = comspeed(speed);
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CSR_WRITE(com_port, com_dlbl, speed);
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CSR_WRITE(com_port, com_dlbh, speed >> 8);
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CSR_WRITE(com_port, com_lctl, LCR_PNONE | LCR_8BITS);
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CSR_WRITE(com_port, com_mcr, MCR_RTS | MCR_DTR);
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CSR_WRITE(com_port, com_fifo,
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FIFO_XMT_RST | FIFO_RCV_RST | FIFO_ENABLE);
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CSR_WRITE(com_port, com_ier, 0);
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return com_port;
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}
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void
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com_putc(void *dev, int c)
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{
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volatile uint8_t *com_port = dev;
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while ((CSR_READ(com_port, com_lsr) & LSR_TXRDY) == 0)
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;
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CSR_WRITE(com_port, com_data, c);
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}
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int
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com_getc(void *dev)
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{
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volatile uint8_t *com_port = dev;
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while ((CSR_READ(com_port, com_lsr) & LSR_RXRDY) == 0)
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;
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return CSR_READ(com_port, com_data);
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}
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int
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com_scankbd(void *dev)
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{
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volatile uint8_t *com_port = dev;
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if ((CSR_READ(com_port, com_lsr) & LSR_RXRDY) == 0)
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return -1;
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return CSR_READ(com_port, com_data);
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}
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#endif /* CONS_SERIAL */
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