scc_dev_sab82532.c revision 253899 
1/*-
2 * Copyright (c) 2004-2006 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/scc/scc_dev_sab82532.c 253899 2013-08-02 23:28:49Z marius $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/conf.h>
34#include <machine/bus.h>
35#include <sys/rman.h>
36#include <sys/serial.h>
37
38#include <dev/scc/scc_bfe.h>
39#include <dev/scc/scc_bus.h>
40
41#include <dev/ic/sab82532.h>
42
43#include "scc_if.h"
44
45static int sab82532_bfe_attach(struct scc_softc *, int);
46static int sab82532_bfe_iclear(struct scc_softc *, struct scc_chan *);
47static int sab82532_bfe_ipend(struct scc_softc *);
48static int sab82532_bfe_probe(struct scc_softc *);
49
50static kobj_method_t sab82532_methods[] = {
51	KOBJMETHOD(scc_attach,	sab82532_bfe_attach),
52	KOBJMETHOD(scc_iclear,	sab82532_bfe_iclear),
53	KOBJMETHOD(scc_ipend,	sab82532_bfe_ipend),
54	KOBJMETHOD(scc_probe,	sab82532_bfe_probe),
55	KOBJMETHOD_END
56};
57
58struct scc_class scc_sab82532_class = {
59	"sab82532 class",
60	sab82532_methods,
61	sizeof(struct scc_softc),
62	.cl_channels = SAB_NCHAN,
63	.cl_class = SCC_CLASS_SAB82532,
64	.cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
65	.cl_range = SAB_CHANLEN,
66};
67
68static int
69sab82532_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
70{
71
72	return (0);
73}
74
75static int
76sab82532_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
77{
78	struct scc_bas *bas;
79	int i, ofs, rbcl;
80
81	bas = &sc->sc_bas;
82	ofs = (ch->ch_nr - 1) * SAB_CHANLEN;
83	mtx_lock_spin(&sc->sc_hwmtx);
84	if (ch->ch_ipend & SER_INT_RXREADY) {
85		if (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_RFNE) {
86			rbcl = scc_getreg(bas, ofs + SAB_RBCL) & 31;
87			if (rbcl == 0)
88				rbcl = 32;
89			for (i = 0; i < rbcl; i += 2) {
90				(void)scc_getreg(bas, ofs + SAB_RFIFO);
91				(void)scc_getreg(bas, ofs + SAB_RFIFO + 1);
92			}
93		}
94		while (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_CEC)
95			;
96		scc_setreg(bas, ofs + SAB_CMDR, SAB_CMDR_RMC);
97		scc_barrier(bas);
98	}
99	mtx_unlock_spin(&sc->sc_hwmtx);
100	return (0);
101}
102
103static int
104sab82532_bfe_ipend(struct scc_softc *sc)
105{
106	struct scc_bas *bas;
107	struct scc_chan *ch;
108	int ipend;
109	int c, ofs;
110	uint8_t isr0, isr1;
111
112	bas = &sc->sc_bas;
113	ipend = 0;
114	for (c = 0; c < SAB_NCHAN; c++) {
115		ch = &sc->sc_chan[c];
116		ofs = c * SAB_CHANLEN;
117		mtx_lock_spin(&sc->sc_hwmtx);
118		isr0 = scc_getreg(bas, ofs + SAB_ISR0);
119		isr1 = scc_getreg(bas, ofs + SAB_ISR1);
120		scc_barrier(bas);
121		if (isr0 & SAB_ISR0_TIME) {
122			while (scc_getreg(bas, ofs + SAB_STAR) & SAB_STAR_CEC)
123				;
124			scc_setreg(bas, ofs + SAB_CMDR, SAB_CMDR_RFRD);
125			scc_barrier(bas);
126		}
127		mtx_unlock_spin(&sc->sc_hwmtx);
128
129		ch->ch_ipend = 0;
130		if (isr1 & SAB_ISR1_BRKT)
131			ch->ch_ipend |= SER_INT_BREAK;
132		if (isr0 & SAB_ISR0_RFO)
133			ch->ch_ipend |= SER_INT_OVERRUN;
134		if (isr0 & (SAB_ISR0_TCD|SAB_ISR0_RPF))
135			ch->ch_ipend |= SER_INT_RXREADY;
136		if ((isr0 & SAB_ISR0_CDSC) || (isr1 & SAB_ISR1_CSC))
137			ch->ch_ipend |= SER_INT_SIGCHG;
138		if (isr1 & SAB_ISR1_ALLS)
139			ch->ch_ipend |= SER_INT_TXIDLE;
140		ipend |= ch->ch_ipend;
141	}
142	return (ipend);
143}
144
145static int
146sab82532_bfe_probe(struct scc_softc *sc __unused)
147{
148
149	return (0);
150}
151