1 /* $NetBSD: moxa_isa.c,v 1.23 2021/08/07 16:19:12 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
5 * Copyright (c) 1995 Charles M. Hannum. All rights reserved.
6 *
7 * This code is derived from public-domain software written by
8 * Roland McGrath.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Charles M. Hannum.
21 * 4. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: moxa_isa.c,v 1.23 2021/08/07 16:19:12 thorpej Exp $");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/device.h>
42 #include <sys/termios.h>
43
44 #include <sys/bus.h>
45 #include <sys/intr.h>
46
47 #include <dev/ic/comreg.h>
48 #include <dev/ic/comvar.h>
49
50 #include <dev/isa/isavar.h>
51 #include <dev/isa/com_multi.h>
52
53 #define NSLAVES 8
54
55 struct moxa_isa_softc {
56 void *sc_ih;
57
58 bus_space_tag_t sc_iot;
59 int sc_iobase;
60
61 int sc_alive; /* mask of slave units attached */
62 void *sc_slaves[NSLAVES]; /* com device unit numbers */
63 bus_space_handle_t sc_slaveioh[NSLAVES];
64 };
65
66 int moxa_isaprobe(device_t, cfdata_t, void *);
67 void moxa_isaattach(device_t, device_t, void *);
68 int moxa_isaintr(void *);
69
70 CFATTACH_DECL_NEW(moxa_isa, sizeof(struct moxa_isa_softc),
71 moxa_isaprobe, moxa_isaattach, NULL, NULL);
72
73 int
moxa_isaprobe(device_t parent,cfdata_t self,void * aux)74 moxa_isaprobe(device_t parent, cfdata_t self, void *aux)
75 {
76 struct isa_attach_args *ia = aux;
77 bus_space_tag_t iot = ia->ia_iot;
78 bus_space_handle_t ioh;
79 int i, iobase, rv = 1;
80
81 /*
82 * Do the normal com probe for the first UART and assume
83 * its presence, and the ability to map the other UARTS,
84 * means there is a multiport board there.
85 * XXX Needs more robustness.
86 */
87
88 if (ia->ia_nio < 1)
89 return (0);
90 if (ia->ia_nirq < 1)
91 return (0);
92
93 if (ISA_DIRECT_CONFIG(ia))
94 return (0);
95
96 /* Disallow wildcarded i/o address. */
97 if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
98 return (0);
99 if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
100 return (0);
101
102 /* if the first port is in use as console, then it. */
103 if (com_is_console(iot, ia->ia_io[0].ir_addr, 0))
104 goto checkmappings;
105
106 if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) {
107 rv = 0;
108 goto out;
109 }
110 rv = comprobe1(iot, ioh);
111 bus_space_unmap(iot, ioh, COM_NPORTS);
112 if (rv == 0)
113 goto out;
114
115 checkmappings:
116 for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) {
117 iobase += COM_NPORTS;
118
119 if (com_is_console(iot, iobase, 0))
120 continue;
121
122 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
123 rv = 0;
124 goto out;
125 }
126 bus_space_unmap(iot, ioh, COM_NPORTS);
127 }
128
129 out:
130 if (rv) {
131 ia->ia_nio = 1;
132 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;
133
134 ia->ia_nirq = 1;
135
136 ia->ia_niomem = 0;
137 ia->ia_ndrq = 0;
138 }
139 return (rv);
140 }
141
142 void
moxa_isaattach(device_t parent,device_t self,void * aux)143 moxa_isaattach(device_t parent, device_t self, void *aux)
144 {
145 struct moxa_isa_softc *sc = device_private(self);
146 struct isa_attach_args *ia = aux;
147 struct commulti_attach_args ca;
148 bus_space_tag_t iot = ia->ia_iot;
149 int i, iobase;
150
151 printf("\n");
152
153 sc->sc_iot = ia->ia_iot;
154 sc->sc_iobase = ia->ia_io[0].ir_addr;
155
156 for (i = 0; i < NSLAVES; i++) {
157 iobase = sc->sc_iobase + i * COM_NPORTS;
158 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
159 bus_space_map(iot, iobase, COM_NPORTS, 0,
160 &sc->sc_slaveioh[i])) {
161 aprint_error_dev(self,
162 "can't map i/o space for slave %d\n", i);
163 return;
164 }
165 }
166
167 for (i = 0; i < NSLAVES; i++) {
168 ca.ca_slave = i;
169 ca.ca_iot = sc->sc_iot;
170 ca.ca_ioh = sc->sc_slaveioh[i];
171 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
172 ca.ca_noien = 1;
173
174 sc->sc_slaves[i] = config_found(self, &ca, commultiprint,
175 CFARGS_NONE);
176 if (sc->sc_slaves[i] != NULL)
177 sc->sc_alive |= 1 << i;
178 }
179
180 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
181 IST_EDGE, IPL_SERIAL, moxa_isaintr, sc);
182 }
183
184 int
moxa_isaintr(void * arg)185 moxa_isaintr(void *arg)
186 {
187 struct moxa_isa_softc *sc = arg;
188 int bits;
189 int rv = 0;
190
191 bits = sc->sc_alive;
192 if (bits == 0)
193 return (0);
194
195 for (;;rv = 0) {
196 #define TRY(n) \
197 if (bits & (1 << (n))) \
198 rv += comintr(sc->sc_slaves[n]);
199 TRY(0);
200 TRY(1);
201 TRY(2);
202 TRY(3);
203 TRY(4);
204 TRY(5);
205 TRY(6);
206 TRY(7);
207 #undef TRY
208 if (rv == 0)
209 return (1);
210 }
211 }
212