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("$FreeBSD$");
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/lock.h>
38 #include <sys/mutex.h>
39 #include <sys/rman.h>
40 #include <sys/serial.h>
41
42 #include <dev/scc/scc_bfe.h>
43 #include <dev/scc/scc_bus.h>
44
45 #include <dev/ic/quicc.h>
46
47 #include "scc_if.h"
48
49 #define quicc_read2(bas, reg) \
50 bus_space_read_2((bas)->bst, (bas)->bsh, reg)
51 #define quicc_read4(bas, reg) \
52 bus_space_read_4((bas)->bst, (bas)->bsh, reg)
53
54 #define quicc_write2(bas, reg, val) \
55 bus_space_write_2((bas)->bst, (bas)->bsh, reg, val)
56 #define quicc_write4(bas, reg, val) \
57 bus_space_write_4((bas)->bst, (bas)->bsh, reg, val)
58
59 static int quicc_bfe_attach(struct scc_softc *, int);
60 static int quicc_bfe_enabled(struct scc_softc *, struct scc_chan *);
61 static int quicc_bfe_iclear(struct scc_softc *, struct scc_chan *);
62 static int quicc_bfe_ipend(struct scc_softc *);
63 static int quicc_bfe_probe(struct scc_softc *);
64
65 static kobj_method_t quicc_methods[] = {
66 KOBJMETHOD(scc_attach, quicc_bfe_attach),
67 KOBJMETHOD(scc_enabled, quicc_bfe_enabled),
68 KOBJMETHOD(scc_iclear, quicc_bfe_iclear),
69 KOBJMETHOD(scc_ipend, quicc_bfe_ipend),
70 KOBJMETHOD(scc_probe, quicc_bfe_probe),
71 KOBJMETHOD_END
72 };
73
74 struct scc_class scc_quicc_class = {
75 "QUICC class",
76 quicc_methods,
77 sizeof(struct scc_softc),
78 .cl_channels = 4,
79 .cl_class = SCC_CLASS_QUICC,
80 .cl_modes = SCC_MODE_ASYNC | SCC_MODE_BISYNC | SCC_MODE_HDLC,
81 .cl_range = 0,
82 };
83
84 static int
85 quicc_bfe_attach(struct scc_softc *sc __unused, int reset __unused)
86 {
87
88 return (0);
89 }
90
91 static int
92 quicc_bfe_enabled(struct scc_softc *sc, struct scc_chan *ch)
93 {
94 struct scc_bas *bas;
95 int unit;
96 uint16_t val0, val1;
97
98 bas = &sc->sc_bas;
99 unit = ch->ch_nr - 1;
100 val0 = quicc_read2(bas, QUICC_REG_SCC_TODR(unit));
101 quicc_write2(bas, QUICC_REG_SCC_TODR(unit), ~val0);
102 val1 = quicc_read2(bas, QUICC_REG_SCC_TODR(unit));
103 quicc_write2(bas, QUICC_REG_SCC_TODR(unit), val0);
104 return (((val0 | val1) == 0x8000) ? 1 : 0);
105 }
106
107 static int
108 quicc_bfe_iclear(struct scc_softc *sc, struct scc_chan *ch)
109 {
110 struct scc_bas *bas;
111 uint16_t rb, st;
112
113 bas = &sc->sc_bas;
114 mtx_lock_spin(&sc->sc_hwmtx);
115 if (ch->ch_ipend & SER_INT_RXREADY) {
116 rb = quicc_read2(bas, QUICC_PRAM_SCC_RBASE(ch->ch_nr - 1));
117 st = quicc_read2(bas, rb);
118 (void)quicc_read4(bas, rb + 4);
119 quicc_write2(bas, rb, st | 0x9000);
120 }
121 mtx_unlock_spin(&sc->sc_hwmtx);
122 return (0);
123 }
124
125 static int
126 quicc_bfe_ipend(struct scc_softc *sc)
127 {
128 struct scc_bas *bas;
129 struct scc_chan *ch;
130 int c, ipend;
131 uint16_t scce;
132
133 bas = &sc->sc_bas;
134 ipend = 0;
135 for (c = 0; c < 4; c++) {
136 ch = &sc->sc_chan[c];
137 if (!ch->ch_enabled)
138 continue;
139 ch->ch_ipend = 0;
140 mtx_lock_spin(&sc->sc_hwmtx);
141 scce = quicc_read2(bas, QUICC_REG_SCC_SCCE(c));
142 quicc_write2(bas, QUICC_REG_SCC_SCCE(c), ~0);
143 mtx_unlock_spin(&sc->sc_hwmtx);
144 if (scce & 0x0001)
145 ch->ch_ipend |= SER_INT_RXREADY;
146 if (scce & 0x0002)
147 ch->ch_ipend |= SER_INT_TXIDLE;
148 if (scce & 0x0004)
149 ch->ch_ipend |= SER_INT_OVERRUN;
150 if (scce & 0x0020)
151 ch->ch_ipend |= SER_INT_BREAK;
152 /* XXX SIGNALS */
153 ipend |= ch->ch_ipend;
154 }
155 return (ipend);
156 }
157
158 static int
159 quicc_bfe_probe(struct scc_softc *sc __unused)
160 {
161
162 return (0);
163 }
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