1 /* $OpenBSD: ast.c,v 1.18 2002/03/14 01:26:56 millert Exp $ */
2 /* $NetBSD: ast.c,v 1.28 1996/05/12 23:51:45 mycroft Exp $ */
3
4 /*
5 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
6 * Copyright (c) 1995 Charles Hannum. All rights reserved.
7 *
8 * This code is derived from public-domain software written by
9 * Roland McGrath.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Charles Hannum.
22 * 4. The name of the author may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/device.h>
40 #include <sys/termios.h>
41
42 #include <machine/bus.h>
43 #include <machine/intr.h>
44
45 #include <dev/isa/isavar.h>
46 #include <dev/ic/comreg.h>
47 #include <dev/ic/comvar.h>
48
49 #define NSLAVES 4
50
51 struct ast_softc {
52 struct device sc_dev;
53 void *sc_ih;
54
55 bus_space_tag_t sc_iot;
56 int sc_iobase;
57
58 int sc_alive; /* mask of slave units attached */
59 void *sc_slaves[NSLAVES]; /* com device unit numbers */
60 bus_space_handle_t sc_slaveioh[NSLAVES];
61 };
62
63 int astprobe(struct device *, void *, void *);
64 void astattach(struct device *, struct device *, void *);
65 int astintr(void *);
66 int astprint(void *, const char *);
67
68 struct cfattach ast_ca = {
69 sizeof(struct ast_softc), astprobe, astattach
70 };
71
72 struct cfdriver ast_cd = {
73 NULL, "ast", DV_TTY
74 };
75
76 int
77 astprobe(parent, self, aux)
78 struct device *parent;
79 void *self;
80 void *aux;
81 {
82 struct isa_attach_args *ia = aux;
83 int iobase = ia->ia_iobase;
84 bus_space_tag_t iot = ia->ia_iot;
85 bus_space_handle_t ioh;
86 int i, rv = 1;
87
88 /*
89 * Do the normal com probe for the first UART and assume
90 * its presence, and the ability to map the other UARTS,
91 * means there is a multiport board there.
92 * XXX Needs more robustness.
93 */
94
95 /* if the first port is in use as console, then it. */
96 if (iobase == comconsaddr && !comconsattached)
97 goto checkmappings;
98
99 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
100 rv = 0;
101 goto out;
102 }
103 rv = comprobe1(iot, ioh);
104 bus_space_unmap(iot, ioh, COM_NPORTS);
105 if (rv == 0)
106 goto out;
107
108 checkmappings:
109 for (i = 1; i < NSLAVES; i++) {
110 iobase += COM_NPORTS;
111
112 if (iobase == comconsaddr && !comconsattached)
113 continue;
114
115 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
116 rv = 0;
117 goto out;
118 }
119 bus_space_unmap(iot, ioh, COM_NPORTS);
120 }
121
122 out:
123 if (rv)
124 ia->ia_iosize = NSLAVES * COM_NPORTS;
125 return (rv);
126 }
127
128 int
129 astprint(aux, pnp)
130 void *aux;
131 const char *pnp;
132 {
133 struct commulti_attach_args *ca = aux;
134
135 if (pnp)
136 printf("com at %s", pnp);
137 printf(" slave %d", ca->ca_slave);
138 return (UNCONF);
139 }
140
141 void
142 astattach(parent, self, aux)
143 struct device *parent, *self;
144 void *aux;
145 {
146 struct ast_softc *sc = (void *)self;
147 struct isa_attach_args *ia = aux;
148 struct commulti_attach_args ca;
149 int i;
150
151 sc->sc_iot = ia->ia_iot;
152 sc->sc_iobase = ia->ia_iobase;
153
154 for (i = 0; i < NSLAVES; i++)
155 if (bus_space_map(sc->sc_iot, sc->sc_iobase + i * COM_NPORTS,
156 COM_NPORTS, 0, &sc->sc_slaveioh[i]))
157 panic("astattach: couldn't map slave %d", i);
158
159 /*
160 * Enable the master interrupt.
161 */
162 bus_space_write_1(sc->sc_iot, sc->sc_slaveioh[3], 7, 0x80);
163
164 printf("\n");
165
166 for (i = 0; i < NSLAVES; i++) {
167 ca.ca_slave = i;
168 ca.ca_iot = sc->sc_iot;
169 ca.ca_ioh = sc->sc_slaveioh[i];
170 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
171 ca.ca_noien = 1;
172
173 sc->sc_slaves[i] = config_found(self, &ca, astprint);
174 if (sc->sc_slaves[i] != NULL)
175 sc->sc_alive |= 1 << i;
176 }
177
178 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
179 IPL_TTY, astintr, sc, sc->sc_dev.dv_xname);
180 }
181
182 int
183 astintr(arg)
184 void *arg;
185 {
186 struct ast_softc *sc = arg;
187 bus_space_tag_t iot = sc->sc_iot;
188 int alive = sc->sc_alive;
189 int bits;
190
191 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
192 if (bits == 0)
193 return (0);
194
195 for (;;) {
196 #define TRY(n) \
197 if (bits & (1 << (n))) \
198 comintr(sc->sc_slaves[n]);
199 TRY(0);
200 TRY(1);
201 TRY(2);
202 TRY(3);
203 #undef TRY
204 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
205 if (bits == 0)
206 return (1);
207 }
208 }