scc_dev_sab82532.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004-2006 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/dev/scc/scc_dev_sab82532.c 330897 2018-03-14 03:19:51Z eadler $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35#include <sys/conf.h>
36#include <machine/bus.h>
37#include <sys/rman.h>
38#include <sys/serial.h>
39
40#include <dev/scc/scc_bfe.h>
41#include <dev/scc/scc_bus.h>
42
43#include <dev/ic/sab82532.h>
44
45#include "scc_if.h"
46
47static int sab82532_bfe_attach(struct scc_softc *, int);
48static int sab82532_bfe_iclear(struct scc_softc *, struct scc_chan *);
49static int sab82532_bfe_ipend(struct scc_softc *);
50static int sab82532_bfe_probe(struct scc_softc *);
51
52static kobj_method_t sab82532_methods[] = {
53	KOBJMETHOD(scc_attach,	sab82532_bfe_attach),
54	KOBJMETHOD(scc_iclear,	sab82532_bfe_iclear),
55	KOBJMETHOD(scc_ipend,	sab82532_bfe_ipend),
56	KOBJMETHOD(scc_probe,	sab82532_bfe_probe),
57	KOBJMETHOD_END
58};
59
60struct scc_class scc_sab82532_class = {
61	"sab82532 class",
62	sab82532_methods,
63	sizeof(struct scc_softc),
64	.cl_channels = SAB_NCHAN,
65	.cl_class = SCC_CLASS_SAB82532,
66	.cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
67	.cl_range = SAB_CHANLEN,
68};
69
70static int
71sab82532_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
72{
73
74	return (0);
75}
76
77static int
78sab82532_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
79{
80	struct scc_bas *bas;
81	int i, ofs, rbcl;
82
83	bas = &sc->sc_bas;
84	ofs = (ch->ch_nr - 1) * SAB_CHANLEN;
85	mtx_lock_spin(&sc->sc_hwmtx);
86	if (ch->ch_ipend & SER_INT_RXREADY) {
87		if (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_RFNE) {
88			rbcl = scc_getreg(bas, ofs + SAB_RBCL) & 31;
89			if (rbcl == 0)
90				rbcl = 32;
91			for (i = 0; i < rbcl; i += 2) {
92				(void)scc_getreg(bas, ofs + SAB_RFIFO);
93				(void)scc_getreg(bas, ofs + SAB_RFIFO + 1);
94			}
95		}
96		while (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_CEC)
97			;
98		scc_setreg(bas, ofs + SAB_CMDR, SAB_CMDR_RMC);
99		scc_barrier(bas);
100	}
101	mtx_unlock_spin(&sc->sc_hwmtx);
102	return (0);
103}
104
105static int
106sab82532_bfe_ipend(struct scc_softc *sc)
107{
108	struct scc_bas *bas;
109	struct scc_chan *ch;
110	int ipend;
111	int c, ofs;
112	uint8_t isr0, isr1;
113
114	bas = &sc->sc_bas;
115	ipend = 0;
116	for (c = 0; c < SAB_NCHAN; c++) {
117		ch = &sc->sc_chan[c];
118		ofs = c * SAB_CHANLEN;
119		mtx_lock_spin(&sc->sc_hwmtx);
120		isr0 = scc_getreg(bas, ofs + SAB_ISR0);
121		isr1 = scc_getreg(bas, ofs + SAB_ISR1);
122		scc_barrier(bas);
123		if (isr0 & SAB_ISR0_TIME) {
124			while (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_CEC)
125				;
126			scc_setreg(bas, ofs + SAB_CMDR, SAB_CMDR_RFRD);
127			scc_barrier(bas);
128		}
129		mtx_unlock_spin(&sc->sc_hwmtx);
130
131		ch->ch_ipend = 0;
132		if (isr1 & SAB_ISR1_BRKT)
133			ch->ch_ipend |= SER_INT_BREAK;
134		if (isr0 & SAB_ISR0_RFO)
135			ch->ch_ipend |= SER_INT_OVERRUN;
136		if (isr0 & (SAB_ISR0_TCD|SAB_ISR0_RPF))
137			ch->ch_ipend |= SER_INT_RXREADY;
138		if ((isr0 & SAB_ISR0_CDSC) || (isr1 & SAB_ISR1_CSC))
139			ch->ch_ipend |= SER_INT_SIGCHG;
140		if (isr1 & SAB_ISR1_ALLS)
141			ch->ch_ipend |= SER_INT_TXIDLE;
142		ipend |= ch->ch_ipend;
143	}
144	return (ipend);
145}
146
147static int
148sab82532_bfe_probe(struct scc_softc *sc __unused)
149{
150
151	return (0);
152}
153