267 lines
8.6 KiB
C
267 lines
8.6 KiB
C
/* $NetBSD: scifcons.c,v 1.1 2006/09/01 21:26:18 uwe Exp $ */
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/* NetBSD: scif.c,v 1.38 2004/12/13 02:14:13 chs Exp */
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/*-
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* Copyright (C) 1999 T.Horiuchi and SAITOH Masanobu. 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. 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
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* OF 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) 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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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/*
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* SH internal serial driver
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*
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* This code is derived from both z8530tty.c and com.c
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*/
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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#include <sh3/scifreg.h>
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#include "boot.h"
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#include "cons.h"
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#define scif_smr_read() SHREG_SCSMR2
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#define scif_smr_write(v) (SHREG_SCSMR2 = (v))
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#define scif_brr_read() SHREG_SCBRR2
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#define scif_brr_write(v) (SHREG_SCBRR2 = (v))
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#define scif_scr_read() SHREG_SCSCR2
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#define scif_scr_write(v) (SHREG_SCSCR2 = (v))
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#define scif_ftdr_write(v) (SHREG_SCFTDR2 = (v))
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#define scif_ssr_read() SHREG_SCSSR2
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#define scif_ssr_write(v) (SHREG_SCSSR2 = (v))
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#define scif_frdr_read() SHREG_SCFRDR2
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#define scif_fcr_read() SHREG_SCFCR2
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#define scif_fcr_write(v) (SHREG_SCFCR2 = (v))
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#define scif_fdr_read() SHREG_SCFDR2
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#define scif_sptr_read() SHREG_SCSPTR2
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#define scif_sptr_write(v) (SHREG_SCSPTR2 = (v))
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#define scif_lsr_read() SHREG_SCLSR2
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#define scif_lsr_write(v) (SHREG_SCLSR2 = (v))
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#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
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#define SERBUFSIZE 16
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static u_char serbuf[SERBUFSIZE];
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static int serbuf_read = 0;
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static int serbuf_write = 0;
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void
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scif_init(unsigned int bps)
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{
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serbuf_read = 0;
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serbuf_write = 0;
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/* Initialize SCR */
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scif_scr_write(0x00);
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/* Clear FIFO */
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scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST);
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/* Serial Mode Register */
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scif_smr_write(0x00); /* 8bit,NonParity,Even,1Stop */
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/* Bit Rate Register */
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scif_brr_write(divrnd(PCLOCK, 32 * bps) - 1);
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delay(100);
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scif_sptr_write(SCSPTR2_RTSIO);
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scif_fcr_write(FIFO_RCV_TRIGGER_1 | FIFO_XMT_TRIGGER_8);
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/* Send permission, Receive permission ON */
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scif_scr_write(SCSCR2_TE | SCSCR2_RE);
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/* Serial Status Register */
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scif_ssr_write(scif_ssr_read() & SCSSR2_TDFE); /* Clear Status */
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}
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int
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scif_getc(void)
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{
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unsigned char c, err_c;
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unsigned short err_c2;
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if (serbuf_read != serbuf_write) {
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c = serbuf[serbuf_read];
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serbuf_read = (serbuf_read + 1) % SERBUFSIZE;
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return (c);
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}
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for (;;) {
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/* wait for ready */
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while ((scif_fdr_read() & SCFDR2_RECVCNT) == 0)
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continue;
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c = scif_frdr_read();
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err_c = scif_ssr_read();
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scif_ssr_write(scif_ssr_read()
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& ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR));
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err_c2 = scif_lsr_read();
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scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER);
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if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER
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| SCSSR2_PER)) == 0) {
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if ((err_c2 & SCLSR2_ORER) == 0) {
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return (c);
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}
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}
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}
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}
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void
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scif_putc(int c)
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{
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/* wait for ready */
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while ((scif_fdr_read() & SCFDR2_TXCNT) == SCFDR2_TXF_FULL)
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continue;
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/* write send data to send register */
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scif_ftdr_write(c);
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/* clear ready flag */
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scif_ssr_write(scif_ssr_read() & ~(SCSSR2_TDFE | SCSSR2_TEND));
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}
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int
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scif_status(void)
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{
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unsigned char c, err_c;
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unsigned short err_c2;
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/* check if any preread input is already there */
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if (serbuf_read != serbuf_write)
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return (1);
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if (scif_fdr_read() & SCFDR2_RECVCNT) {
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c = scif_frdr_read();
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err_c = scif_ssr_read();
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scif_ssr_write(scif_ssr_read()
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& ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR));
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err_c2 = scif_lsr_read();
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scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER);
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if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER
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| SCSSR2_PER)) == 0) {
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if ((err_c2 & SCLSR2_ORER) == 0) {
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/* stuff char into preread buffer */
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serbuf[serbuf_write] = (u_char)c;
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serbuf_write = (serbuf_write + 1) % SERBUFSIZE;
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return (1);
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}
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}
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}
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return (0); /* nothing out there... */
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}
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int
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scif_status2(void)
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{
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if (scif_fdr_read() & SCFDR2_RECVCNT) {
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return (1);
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}
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return (0);
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}
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