1 /* $NetBSD: pcons.c,v 1.22 2014/07/25 08:10:35 dholland Exp $ */
2
3 /*-
4 * Copyright (c) 2000 Eduardo E. Horvath
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 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 /*
32 * Default console driver. Uses the PROM or whatever
33 * driver(s) are appropriate.
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: pcons.c,v 1.22 2014/07/25 08:10:35 dholland Exp $");
38
39 #include "opt_ddb.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/conf.h>
44 #include <sys/device.h>
45 #include <sys/file.h>
46 #include <sys/ioctl.h>
47 #include <sys/kernel.h>
48 #include <sys/proc.h>
49 #include <sys/tty.h>
50 #include <sys/time.h>
51 #include <sys/syslog.h>
52 #include <sys/kauth.h>
53
54 #include <machine/autoconf.h>
55 #include <machine/promlib.h>
56 #include <machine/cpu.h>
57 #include <machine/psl.h>
58
59 #include <dev/cons.h>
60
61 #include <sun2/dev/cons.h>
62
63 #include "ioconf.h"
64
65 static int pconsmatch(device_t, cfdata_t, void *);
66 static void pconsattach(device_t, device_t, void *);
67
68 CFATTACH_DECL_NEW(pcons, sizeof(struct pconssoftc),
69 pconsmatch, pconsattach, NULL, NULL);
70
71 static struct cnm_state pcons_cnm_state;
72
73 static int pconsprobe(void);
74
75 dev_type_open(pconsopen);
76 dev_type_close(pconsclose);
77 dev_type_read(pconsread);
78 dev_type_write(pconswrite);
79 dev_type_ioctl(pconsioctl);
80 dev_type_tty(pconstty);
81 dev_type_poll(pconspoll);
82
83 const struct cdevsw pcons_cdevsw = {
84 .d_open = pconsopen,
85 .d_close = pconsclose,
86 .d_read = pconsread,
87 .d_write = pconswrite,
88 .d_ioctl = pconsioctl,
89 .d_stop = nostop,
90 .d_tty = pconstty,
91 .d_poll = pconspoll,
92 .d_mmap = nommap,
93 .d_kqfilter = ttykqfilter,
94 .d_discard = nodiscard,
95 .d_flag = D_TTY
96 };
97
98 static int
pconsmatch(device_t parent,cfdata_t cf,void * aux)99 pconsmatch(device_t parent, cfdata_t cf, void *aux)
100 {
101 struct mainbus_attach_args *ma = aux;
102 extern int prom_cngetc(dev_t);
103
104 /* Only attach if no other console has attached. */
105 return (ma->ma_name != NULL) &&
106 (strcmp("pcons", ma->ma_name) == 0) &&
107 (cn_tab->cn_getc == prom_cngetc);
108
109 }
110
111 static void
pconsattach(device_t parent,device_t self,void * aux)112 pconsattach(device_t parent, device_t self, void *aux)
113 {
114 struct pconssoftc *sc = device_private(self);
115
116 aprint_normal("\n");
117 if (!pconsprobe())
118 return;
119
120 cn_init_magic(&pcons_cnm_state);
121 cn_set_magic("+++++");
122 callout_init(&sc->sc_poll_ch, 0);
123 }
124
125 static void pconsstart(struct tty *);
126 static int pconsparam(struct tty *, struct termios *);
127 static void pcons_poll(void *);
128
129 int
pconsopen(dev_t dev,int flag,int mode,struct lwp * l)130 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
131 {
132 struct pconssoftc *sc;
133 struct tty *tp;
134
135 sc = device_lookup_private(&pcons_cd, minor(dev));
136 if (sc == NULL)
137 return ENXIO;
138 if ((tp = sc->of_tty) == NULL)
139 sc->of_tty = tp = tty_alloc();
140 tp->t_oproc = pconsstart;
141 tp->t_param = pconsparam;
142 tp->t_dev = dev;
143 cn_tab->cn_dev = dev;
144 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
145 return (EBUSY);
146 if ((tp->t_state & TS_ISOPEN) == 0) {
147 ttychars(tp);
148 tp->t_iflag = TTYDEF_IFLAG;
149 tp->t_oflag = TTYDEF_OFLAG;
150 tp->t_cflag = TTYDEF_CFLAG;
151 tp->t_lflag = TTYDEF_LFLAG;
152 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
153 pconsparam(tp, &tp->t_termios);
154 ttsetwater(tp);
155 }
156 tp->t_state |= TS_CARR_ON;
157
158 if ((sc->of_flags & OFPOLL) == 0) {
159 sc->of_flags |= OFPOLL;
160 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
161 }
162
163 return (*tp->t_linesw->l_open)(dev, tp);
164 }
165
166 int
pconsclose(dev_t dev,int flag,int mode,struct lwp * l)167 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
168 {
169 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
170 struct tty *tp = sc->of_tty;
171
172 callout_stop(&sc->sc_poll_ch);
173 sc->of_flags &= ~OFPOLL;
174 (*tp->t_linesw->l_close)(tp, flag);
175 ttyclose(tp);
176 return 0;
177 }
178
179 int
pconsread(dev_t dev,struct uio * uio,int flag)180 pconsread(dev_t dev, struct uio *uio, int flag)
181 {
182 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
183 struct tty *tp = sc->of_tty;
184
185 return (*tp->t_linesw->l_read)(tp, uio, flag);
186 }
187
188 int
pconswrite(dev_t dev,struct uio * uio,int flag)189 pconswrite(dev_t dev, struct uio *uio, int flag)
190 {
191 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
192 struct tty *tp = sc->of_tty;
193
194 return (*tp->t_linesw->l_write)(tp, uio, flag);
195 }
196
197 int
pconspoll(dev_t dev,int events,struct lwp * l)198 pconspoll(dev_t dev, int events, struct lwp *l)
199 {
200 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
201 struct tty *tp = sc->of_tty;
202
203 return (*tp->t_linesw->l_poll)(tp, events, l);
204 }
205
206 int
pconsioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)207 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
208 {
209 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
210 struct tty *tp = sc->of_tty;
211 int error;
212
213 if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) >= 0)
214 return error;
215 if ((error = ttioctl(tp, cmd, data, flag, l)) >= 0)
216 return error;
217 return ENOTTY;
218 }
219
220 struct tty *
pconstty(dev_t dev)221 pconstty(dev_t dev)
222 {
223 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
224
225 return sc->of_tty;
226 }
227
228 static void
pconsstart(struct tty * tp)229 pconsstart(struct tty *tp)
230 {
231 struct clist *cl;
232 int s, len;
233 uint8_t buf[OFBURSTLEN];
234
235 s = spltty();
236 if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
237 splx(s);
238 return;
239 }
240 tp->t_state |= TS_BUSY;
241 splx(s);
242 cl = &tp->t_outq;
243 len = q_to_b(cl, buf, OFBURSTLEN);
244 prom_putstr(buf, len);
245 s = spltty();
246 tp->t_state &= ~TS_BUSY;
247 if (ttypull(tp)) {
248 tp->t_state |= TS_TIMEOUT;
249 callout_schedule(&tp->t_rstrt_ch, 1);
250 }
251 splx(s);
252 }
253
254 static int
pconsparam(struct tty * tp,struct termios * t)255 pconsparam(struct tty *tp, struct termios *t)
256 {
257
258 tp->t_ispeed = t->c_ispeed;
259 tp->t_ospeed = t->c_ospeed;
260 tp->t_cflag = t->c_cflag;
261 return 0;
262 }
263
264 static void
pcons_poll(void * aux)265 pcons_poll(void *aux)
266 {
267 struct pconssoftc *sc = aux;
268 struct tty *tp = sc->of_tty;
269 int c;
270 char ch;
271
272 while ((c = prom_peekchar()) >= 0) {
273 ch = c;
274 cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
275 if (tp && (tp->t_state & TS_ISOPEN))
276 (*tp->t_linesw->l_rint)(ch, tp);
277 }
278 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
279 }
280
281 int
pconsprobe(void)282 pconsprobe(void)
283 {
284
285 switch (prom_version()) {
286 #ifdef PROM_OLDMON
287 case PROM_OLDMON:
288 case PROM_OBP_V0:
289 return 1;
290 #endif /* PROM_OLDMON */
291 #ifdef PROM_OBP_V2
292 case PROM_OBP_V2:
293 case PROM_OBP_V3:
294 case PROM_OPENFIRM:
295 return prom_stdin() && prom_stdout();
296 #endif /* PROM_OBP_V2 */
297 default:
298 break;
299 }
300 return 0;
301 }
302
303 void
pcons_cnpollc(dev_t dev,int on)304 pcons_cnpollc(dev_t dev, int on)
305 {
306 struct pconssoftc *sc;
307
308 sc = device_lookup_private(&pcons_cd, minor(dev));
309 if (sc == NULL)
310 return;
311
312 if (on) {
313 if (sc->of_flags & OFPOLL)
314 callout_stop(&sc->sc_poll_ch);
315 sc->of_flags &= ~OFPOLL;
316 } else {
317 /* Resuming kernel. */
318 if ((sc->of_flags & OFPOLL) == 0) {
319 sc->of_flags |= OFPOLL;
320 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
321 }
322 }
323 }
324
325 void pcons_dopoll(void);
326
327 void
pcons_dopoll(void)328 pcons_dopoll(void)
329 {
330
331 pcons_poll(device_lookup_private(&pcons_cd, 0));
332 }
333