1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/systm.h>
31 #include <sys/bus.h>
32 #include <sys/conf.h>
33 #include <machine/bus.h>
34 #include <sys/lock.h>
35 #include <sys/mutex.h>
36 #include <sys/rman.h>
37 #include <sys/serial.h>
38
39 #include <dev/scc/scc_bfe.h>
40 #include <dev/scc/scc_bus.h>
41
42 #include <dev/ic/z8530.h>
43
44 #include "scc_if.h"
45
46 static int z8530_bfe_attach(struct scc_softc *, int);
47 static int z8530_bfe_iclear(struct scc_softc *, struct scc_chan *);
48 static int z8530_bfe_ipend(struct scc_softc *);
49 static int z8530_bfe_probe(struct scc_softc *);
50
51 /* Channel B is always at 0 offset. */
52 #define CHAN_A (-(sc->sc_class->cl_range))
53 #define CHAN_B 0
54
55 static kobj_method_t z8530_methods[] = {
56 KOBJMETHOD(scc_attach, z8530_bfe_attach),
57 KOBJMETHOD(scc_iclear, z8530_bfe_iclear),
58 KOBJMETHOD(scc_ipend, z8530_bfe_ipend),
59 KOBJMETHOD(scc_probe, z8530_bfe_probe),
60 KOBJMETHOD_END
61 };
62
63 /*
64 * escc (macio) spacing.
65 */
66 struct scc_class scc_z8530_escc_class = {
67 "z8530 escc class",
68 z8530_methods,
69 sizeof(struct scc_softc),
70 .cl_channels = 2,
71 .cl_class = SCC_CLASS_Z8530,
72 .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
73 /* Negative .cl_range signifies this is channel spacing. */
74 .cl_range = (CHAN_B - 16),
75 };
76
77 /*
78 * SUN compatible channel spacing.
79 */
80 struct scc_class scc_z8530_legacy_class = {
81 "z8530 legacy class",
82 z8530_methods,
83 sizeof(struct scc_softc),
84 .cl_channels = 2,
85 .cl_class = SCC_CLASS_Z8530,
86 .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
87 /* Negative .cl_range signifies this is channel spacing. */
88 .cl_range = (CHAN_B - 2),
89 };
90
91 /* Multiplexed I/O. */
92 static __inline uint8_t
scc_getmreg(struct scc_bas * bas,int ch,int reg)93 scc_getmreg(struct scc_bas *bas, int ch, int reg)
94 {
95
96 scc_setreg(bas, ch + REG_CTRL, reg);
97 scc_barrier(bas);
98 return (scc_getreg(bas, ch + REG_CTRL));
99 }
100
101 static int
z8530_bfe_attach(struct scc_softc * sc __unused,int reset __unused)102 z8530_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
103 {
104
105 return (0);
106 }
107
108 static int
z8530_bfe_iclear(struct scc_softc * sc,struct scc_chan * ch)109 z8530_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
110 {
111 struct scc_bas *bas;
112 int c;
113
114 bas = &sc->sc_bas;
115 c = (ch->ch_nr == 1) ? CHAN_A : CHAN_B;
116 mtx_lock_spin(&sc->sc_hwmtx);
117 if (ch->ch_ipend & SER_INT_TXIDLE) {
118 scc_setreg(bas, c + REG_CTRL, CR_RSTTXI);
119 scc_barrier(bas);
120 }
121 if (ch->ch_ipend & SER_INT_RXREADY) {
122 scc_getreg(bas, c + REG_DATA);
123 scc_barrier(bas);
124 }
125 if (ch->ch_ipend & (SER_INT_OVERRUN|SER_INT_BREAK))
126 scc_setreg(bas, c + REG_CTRL, CR_RSTERR);
127 mtx_unlock_spin(&sc->sc_hwmtx);
128 return (0);
129 }
130
131 #define SIGCHG(c, i, s, d) \
132 if (c) { \
133 i |= (i & s) ? s : s | d; \
134 } else { \
135 i = (i & s) ? (i & ~s) | d : i; \
136 }
137
138 static int
z8530_bfe_ipend(struct scc_softc * sc)139 z8530_bfe_ipend(struct scc_softc *sc)
140 {
141 struct scc_bas *bas;
142 struct scc_chan *ch[2];
143 uint32_t sig;
144 uint8_t bes, ip, src;
145
146 bas = &sc->sc_bas;
147 ch[0] = &sc->sc_chan[0];
148 ch[1] = &sc->sc_chan[1];
149 ch[0]->ch_ipend = 0;
150 ch[1]->ch_ipend = 0;
151
152 mtx_lock_spin(&sc->sc_hwmtx);
153 ip = scc_getmreg(bas, CHAN_A, RR_IP);
154 if (ip & IP_RIA)
155 ch[0]->ch_ipend |= SER_INT_RXREADY;
156 if (ip & IP_RIB)
157 ch[1]->ch_ipend |= SER_INT_RXREADY;
158 if (ip & IP_TIA)
159 ch[0]->ch_ipend |= SER_INT_TXIDLE;
160 if (ip & IP_TIB)
161 ch[1]->ch_ipend |= SER_INT_TXIDLE;
162 if (ip & IP_SIA) {
163 bes = scc_getmreg(bas, CHAN_A, CR_RSTXSI);
164 if (bes & BES_BRK)
165 ch[0]->ch_ipend |= SER_INT_BREAK;
166 sig = ch[0]->ch_hwsig;
167 SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
168 SIGCHG(bes & BES_DCD, sig, SER_DCD, SER_DDCD);
169 SIGCHG(bes & BES_SYNC, sig, SER_DSR, SER_DDSR);
170 if (sig & SER_MASK_DELTA) {
171 ch[0]->ch_hwsig = sig;
172 ch[0]->ch_ipend |= SER_INT_SIGCHG;
173 }
174 src = scc_getmreg(bas, CHAN_A, RR_SRC);
175 if (src & SRC_OVR)
176 ch[0]->ch_ipend |= SER_INT_OVERRUN;
177 }
178 if (ip & IP_SIB) {
179 bes = scc_getmreg(bas, CHAN_B, CR_RSTXSI);
180 if (bes & BES_BRK)
181 ch[1]->ch_ipend |= SER_INT_BREAK;
182 sig = ch[1]->ch_hwsig;
183 SIGCHG(bes & BES_CTS, sig, SER_CTS, SER_DCTS);
184 SIGCHG(bes & BES_DCD, sig, SER_DCD, SER_DDCD);
185 SIGCHG(bes & BES_SYNC, sig, SER_DSR, SER_DDSR);
186 if (sig & SER_MASK_DELTA) {
187 ch[1]->ch_hwsig = sig;
188 ch[1]->ch_ipend |= SER_INT_SIGCHG;
189 }
190 src = scc_getmreg(bas, CHAN_B, RR_SRC);
191 if (src & SRC_OVR)
192 ch[1]->ch_ipend |= SER_INT_OVERRUN;
193 }
194 mtx_unlock_spin(&sc->sc_hwmtx);
195
196 return (ch[0]->ch_ipend | ch[1]->ch_ipend);
197 }
198
199 static int
z8530_bfe_probe(struct scc_softc * sc __unused)200 z8530_bfe_probe(struct scc_softc *sc __unused)
201 {
202
203 return (0);
204 }
205