190 lines
6.6 KiB
C
190 lines
6.6 KiB
C
/* $NetBSD: com.c,v 1.1 2011/03/03 05:59:37 kiyohara 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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/*-
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* Copyright (c) 1993, 1994, 1995, 1996, 1997
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* Charles M. Hannum. All rights reserved.
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*
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* Interrupt processing and hardware flow control partly based on code from
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* Onno van der Linden and Gordon Ross.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles M. Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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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/*
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* Copyright (c) 1991 The Regents of the University of California.
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* 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)com.c 7.5 (Berkeley) 5/16/91
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*/
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#ifdef CONS_COM
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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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#define COM_FREQ 1843200 /* 16-bit baud rate divisor */
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#define COM_TOLERANCE 30 /* baud rate tolerance, in 0.1% units */
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static int comspeed(long);
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static int
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comspeed(long speed)
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{
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#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
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int x, err;
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long frequency = COM_FREQ * 10;
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if (speed <= 0)
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return -1;
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x = divrnd((frequency / 16), speed);
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if (x <= 0)
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return -1;
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err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000;
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if (err < 0)
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err = -err;
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if (err > COM_TOLERANCE)
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return -1;
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return x;
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#undef divrnd
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}
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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 *)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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