1 /* $NetBSD: ast.c,v 1.68 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: ast.c,v 1.68 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 4
54
55 struct ast_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 softc pointers */
63 bus_space_handle_t sc_slaveioh[NSLAVES];
64 };
65
66 int astprobe(device_t, cfdata_t, void *);
67 void astattach(device_t, device_t, void *);
68 int astintr(void *);
69
70 CFATTACH_DECL_NEW(ast, sizeof(struct ast_softc),
71 astprobe, astattach, NULL, NULL);
72
73 int
astprobe(device_t parent,cfdata_t self,void * aux)74 astprobe(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
100 if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ)
101 return (0);
102
103 /* if the first port is in use as console, then it. */
104 if (com_is_console(iot, ia->ia_io[0].ir_addr, 0))
105 goto checkmappings;
106
107 if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) {
108 rv = 0;
109 goto out;
110 }
111 rv = comprobe1(iot, ioh);
112 bus_space_unmap(iot, ioh, COM_NPORTS);
113 if (rv == 0)
114 goto out;
115
116 checkmappings:
117 for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) {
118 iobase += COM_NPORTS;
119
120 if (com_is_console(iot, iobase, 0))
121 continue;
122
123 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
124 rv = 0;
125 goto out;
126 }
127 bus_space_unmap(iot, ioh, COM_NPORTS);
128 }
129
130 out:
131 if (rv) {
132 ia->ia_nio = 1;
133 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS;
134
135 ia->ia_nirq = 1;
136
137 ia->ia_niomem = 0;
138 ia->ia_ndrq = 0;
139 }
140 return (rv);
141 }
142
143 void
astattach(device_t parent,device_t self,void * aux)144 astattach(device_t parent, device_t self, void *aux)
145 {
146 struct ast_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;
151 device_t slave;
152
153 printf("\n");
154
155 sc->sc_iot = ia->ia_iot;
156 sc->sc_iobase = ia->ia_io[0].ir_addr;
157
158 for (i = 0; i < NSLAVES; i++) {
159 iobase = sc->sc_iobase + i * COM_NPORTS;
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 /*
170 * Enable the master interrupt.
171 */
172 bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80);
173
174 for (i = 0; i < NSLAVES; i++) {
175 ca.ca_slave = i;
176 ca.ca_iot = sc->sc_iot;
177 ca.ca_ioh = sc->sc_slaveioh[i];
178 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
179 ca.ca_noien = 1;
180
181 slave = config_found(self, &ca, commultiprint, CFARGS_NONE);
182 if (slave != NULL) {
183 sc->sc_alive |= 1 << i;
184 sc->sc_slaves[i] = device_private(slave);
185 }
186 }
187
188 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
189 IST_EDGE, IPL_SERIAL, astintr, sc);
190 }
191
192 int
astintr(void * arg)193 astintr(void *arg)
194 {
195 struct ast_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_slaveioh[3], com_scratch) & 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 #undef TRY
213 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3],
214 com_scratch) & alive;
215 if (bits == 0)
216 return (1);
217 }
218 }
219