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/* $OpenBSD: scifcons.c,v 1.1 2006/10/06 21:48:50 mickey Exp $ */
/* $NetBSD: scifcons.c,v 1.1 2006/09/01 21:26:18 uwe Exp $ */
/* NetBSD: scif.c,v 1.38 2004/12/13 02:14:13 chs Exp */
/*-
* Copyright (C) 1999 T.Horiuchi and SAITOH Masanobu. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)com.c 7.5 (Berkeley) 5/16/91
*/
/*
* SH internal serial driver
*
* This code is derived from both z8530tty.c and com.c
*/
#include <libsa.h>
#include <sh/scifreg.h>
#define scif_smr_read() SHREG_SCSMR2
#define scif_smr_write(v) (SHREG_SCSMR2 = (v))
#define scif_brr_read() SHREG_SCBRR2
#define scif_brr_write(v) (SHREG_SCBRR2 = (v))
#define scif_scr_read() SHREG_SCSCR2
#define scif_scr_write(v) (SHREG_SCSCR2 = (v))
#define scif_ftdr_write(v) (SHREG_SCFTDR2 = (v))
#define scif_ssr_read() SHREG_SCSSR2
#define scif_ssr_write(v) (SHREG_SCSSR2 = (v))
#define scif_frdr_read() SHREG_SCFRDR2
#define scif_fcr_read() SHREG_SCFCR2
#define scif_fcr_write(v) (SHREG_SCFCR2 = (v))
#define scif_fdr_read() SHREG_SCFDR2
#define scif_sptr_read() SHREG_SCSPTR2
#define scif_sptr_write(v) (SHREG_SCSPTR2 = (v))
#define scif_lsr_read() SHREG_SCLSR2
#define scif_lsr_write(v) (SHREG_SCLSR2 = (v))
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
#define SERBUFSIZE 16
static u_char serbuf[SERBUFSIZE];
static int serbuf_read = 0;
static int serbuf_write = 0;
void
scif_init(unsigned int bps)
{
serbuf_read = 0;
serbuf_write = 0;
/* Initialize SCR */
scif_scr_write(0x00);
/* Clear FIFO */
scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST);
/* Serial Mode Register */
scif_smr_write(0x00); /* 8bit,NonParity,Even,1Stop */
/* Bit Rate Register */
scif_brr_write(divrnd(PCLOCK, 32 * bps) - 1);
delay(100);
scif_sptr_write(SCSPTR2_RTSIO);
scif_fcr_write(FIFO_RCV_TRIGGER_1 | FIFO_XMT_TRIGGER_8);
/* Send permission, Receive permission ON */
scif_scr_write(SCSCR2_TE | SCSCR2_RE);
/* Serial Status Register */
scif_ssr_write(scif_ssr_read() & SCSSR2_TDFE); /* Clear Status */
}
int
scif_getc(void)
{
unsigned char c, err_c;
unsigned short err_c2;
if (serbuf_read != serbuf_write) {
c = serbuf[serbuf_read];
serbuf_read = (serbuf_read + 1) % SERBUFSIZE;
return (c);
}
for (;;) {
/* wait for ready */
while ((scif_fdr_read() & SCFDR2_RECVCNT) == 0)
continue;
c = scif_frdr_read();
err_c = scif_ssr_read();
scif_ssr_write(scif_ssr_read()
& ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR));
err_c2 = scif_lsr_read();
scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER);
if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER
| SCSSR2_PER)) == 0) {
if ((err_c2 & SCLSR2_ORER) == 0) {
return (c);
}
}
}
}
void
scif_putc(int c)
{
/* wait for ready */
while ((scif_fdr_read() & SCFDR2_TXCNT) == SCFDR2_TXF_FULL)
continue;
/* write send data to send register */
scif_ftdr_write(c);
/* clear ready flag */
scif_ssr_write(scif_ssr_read() & ~(SCSSR2_TDFE | SCSSR2_TEND));
}
int
cnischar(void)
{
unsigned char c, err_c;
unsigned short err_c2;
/* check if any preread input is already there */
if (serbuf_read != serbuf_write)
return (1);
if (scif_fdr_read() & SCFDR2_RECVCNT) {
c = scif_frdr_read();
err_c = scif_ssr_read();
scif_ssr_write(scif_ssr_read()
& ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR));
err_c2 = scif_lsr_read();
scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER);
if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER
| SCSSR2_PER)) == 0) {
if ((err_c2 & SCLSR2_ORER) == 0) {
/* stuff char into preread buffer */
serbuf[serbuf_write] = (u_char)c;
serbuf_write = (serbuf_write + 1) % SERBUFSIZE;
return (1);
}
}
}
return (0); /* nothing out there... */
}
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