1 /* $NetBSD: ioat66.c,v 1.24 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, and information provided by David Muir Sharnoff.
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: ioat66.c,v 1.24 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 6
54
55 struct ioat66_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 bus_space_handle_t sc_intmasq;
65 };
66
67 int ioatbases[NSLAVES]={0x220,0x228,0x240,0x248,0x260,0x268};
68 #define IOAT66SHARED 0x208
69
70 int ioat66probe(device_t, cfdata_t, void *);
71 void ioat66attach(device_t, device_t, void *);
72 int ioat66intr(void *);
73
74 CFATTACH_DECL_NEW(ioat, sizeof(struct ioat66_softc),
75 ioat66probe, ioat66attach, NULL, NULL);
76
77 int
ioat66probe(device_t parent,cfdata_t self,void * aux)78 ioat66probe(device_t parent, cfdata_t self, void *aux)
79 {
80 struct isa_attach_args *ia = aux;
81 bus_space_tag_t iot = ia->ia_iot;
82 bus_space_handle_t ioh;
83 int iobase;
84 int i, rv = 1;
85
86 if (ia->ia_niomem < 1)
87 return (0);
88 if (ia->ia_nirq < 1)
89 return (0);
90 /*
91 * Do the normal com probe for the first UART and assume
92 * its presence, and the ability to map the other UARTS,
93 * means there is a multiport board there.
94 * XXX Needs more robustness.
95 */
96
97 /* Disallow wildcarded i/o address. */
98 if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
99 return 0;
100
101 if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
102 return (0);
103
104 iobase = ia->ia_io[0].ir_addr;
105 /* if the first port is in use as console, then it. */
106 if (com_is_console(iot, iobase, 0))
107 goto checkmappings;
108
109 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
110 rv = 0;
111 goto out;
112 }
113 rv = comprobe1(iot, ioh);
114 bus_space_unmap(iot, ioh, COM_NPORTS);
115 if (rv == 0)
116 goto out;
117
118 checkmappings:
119 for (i = 1; i < NSLAVES; i++) {
120 iobase = ioatbases[i];
121
122 if (com_is_console(iot, iobase, 0))
123 continue;
124
125 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
126 rv = 0;
127 goto out;
128 }
129 bus_space_unmap(iot, ioh, COM_NPORTS);
130 }
131
132 out:
133 if (rv) {
134 ia->ia_nio = 1;
135 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;
136 ia->ia_nirq = 1;
137 ia->ia_niomem = 0;
138 ia->ia_ndrq = 0;
139 }
140 return (rv);
141 }
142
143 void
ioat66attach(device_t parent,device_t self,void * aux)144 ioat66attach(device_t parent, device_t self, void *aux)
145 {
146 struct ioat66_softc *sc = device_private(self);
147 struct isa_attach_args *ia = aux;
148 struct commulti_attach_args ca;
149 bus_space_tag_t iot = ia->ia_iot;
150 int i, iobase, irq;
151
152 printf("\n");
153
154 sc->sc_iot = ia->ia_iot;
155 sc->sc_iobase = ia->ia_io[0].ir_addr;
156 irq = ia->ia_irq[0].ir_irq;
157
158 for (i = 0; i < NSLAVES; i++) {
159 iobase = ioatbases[i];
160 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
161 bus_space_map(iot, iobase, COM_NPORTS, 0,
162 &sc->sc_slaveioh[i])) {
163 aprint_error_dev(self,
164 "can't map i/o space for slave %d\n", i);
165 return;
166 }
167 }
168
169 if(bus_space_map(iot, IOAT66SHARED, 1, 0, &sc->sc_intmasq)) {
170 aprint_error_dev(self, "can't map shared interrupt mask\n");
171 return;
172 }
173
174 for (i = 0; i < NSLAVES; i++) {
175
176 ca.ca_slave = i;
177 ca.ca_iot = sc->sc_iot;
178 ca.ca_ioh = sc->sc_slaveioh[i];
179 ca.ca_iobase = ioatbases[i];
180 ca.ca_noien = 0;
181
182 sc->sc_slaves[i] = config_found(self, &ca, commultiprint,
183 CFARGS_NONE);
184 if (sc->sc_slaves[i] != NULL)
185 sc->sc_alive |= 1 << i;
186 }
187
188 sc->sc_ih = isa_intr_establish(ia->ia_ic, irq, IST_EDGE,
189 IPL_SERIAL, ioat66intr, sc);
190 }
191
192 int
ioat66intr(void * arg)193 ioat66intr(void *arg)
194 {
195 struct ioat66_softc *sc = arg;
196 bus_space_tag_t iot = sc->sc_iot;
197 int alive = sc->sc_alive;
198 int bits;
199
200 bits = bus_space_read_1(iot, sc->sc_intmasq, 0) & alive;
201 if (bits == 0)
202 return (0);
203
204 for (;;) {
205 #define TRY(n) \
206 if (bits & (1 << (n))) \
207 comintr(sc->sc_slaves[n]);
208 TRY(0);
209 TRY(1);
210 TRY(2);
211 TRY(3);
212 TRY(4);
213 TRY(5);
214 #undef TRY
215 bits = bus_space_read_1(iot, sc->sc_intmasq, 0) & alive;
216 if (bits == 0)
217 return (1);
218 }
219 }
220