1 /* $NetBSD: pcons.c,v 1.34 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 1.34 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/openfirm.h>
56 #include <machine/cpu.h>
57 #include <machine/eeprom.h>
58 #include <machine/psl.h>
59
60 #include <dev/cons.h>
61
62 #include <sparc64/dev/cons.h>
63
64 static int pconsmatch(device_t, cfdata_t, void *);
65 static void pconsattach(device_t, device_t, void *);
66
67 CFATTACH_DECL_NEW(pcons, sizeof(struct pconssoftc),
68 pconsmatch, pconsattach, NULL, NULL);
69
70 extern struct cfdriver pcons_cd;
71
72 dev_type_open(pconsopen);
73 dev_type_close(pconsclose);
74 dev_type_read(pconsread);
75 dev_type_write(pconswrite);
76 dev_type_ioctl(pconsioctl);
77 dev_type_tty(pconstty);
78 dev_type_poll(pconspoll);
79
80 const struct cdevsw pcons_cdevsw = {
81 .d_open = pconsopen,
82 .d_close = pconsclose,
83 .d_read = pconsread,
84 .d_write = pconswrite,
85 .d_ioctl = pconsioctl,
86 .d_stop = nostop,
87 .d_tty = pconstty,
88 .d_poll = pconspoll,
89 .d_mmap = nommap,
90 .d_kqfilter = ttykqfilter,
91 .d_discard = nodiscard,
92 .d_flag = D_TTY
93 };
94
95 static struct cnm_state pcons_cnm_state;
96
97 static int pconsprobe(void);
98 extern struct consdev *cn_tab;
99
100 static int
pconsmatch(device_t parent,cfdata_t match,void * aux)101 pconsmatch(device_t parent, cfdata_t match, void *aux)
102 {
103 struct mainbus_attach_args *ma = aux;
104 extern int prom_cngetc(dev_t);
105
106 /* Only attach if no other console has attached. */
107 return ((strcmp("pcons", ma->ma_name) == 0) &&
108 (cn_tab->cn_getc == prom_cngetc));
109
110 }
111
112 static void
pconsattach(device_t parent,device_t self,void * aux)113 pconsattach(device_t parent, device_t self, void *aux)
114 {
115 struct pconssoftc *sc = device_private(self);
116 sc->of_dev = self;
117
118 printf("\n");
119 if (!pconsprobe())
120 return;
121
122 cn_init_magic(&pcons_cnm_state);
123 cn_set_magic("+++++");
124 callout_init(&sc->sc_poll_ch, 0);
125 }
126
127 static void pconsstart(struct tty *);
128 static int pconsparam(struct tty *, struct termios *);
129 static void pcons_poll(void *);
130
131 int
pconsopen(dev_t dev,int flag,int mode,struct lwp * l)132 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
133 {
134 struct pconssoftc *sc;
135 struct tty *tp;
136
137 sc = device_lookup_private(&pcons_cd, minor(dev));
138 if (!sc)
139 return ENXIO;
140 if (!(tp = sc->of_tty))
141 sc->of_tty = tp = tty_alloc();
142 tp->t_oproc = pconsstart;
143 tp->t_param = pconsparam;
144 tp->t_dev = dev;
145 cn_tab->cn_dev = dev;
146 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
147 return (EBUSY);
148 if (!(tp->t_state & TS_ISOPEN)) {
149 ttychars(tp);
150 tp->t_iflag = TTYDEF_IFLAG;
151 tp->t_oflag = TTYDEF_OFLAG;
152 tp->t_cflag = TTYDEF_CFLAG;
153 tp->t_lflag = TTYDEF_LFLAG;
154 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
155 pconsparam(tp, &tp->t_termios);
156 ttsetwater(tp);
157 }
158 tp->t_state |= TS_CARR_ON;
159
160 if (!(sc->of_flags & OFPOLL)) {
161 sc->of_flags |= OFPOLL;
162 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
163 }
164
165 return (*tp->t_linesw->l_open)(dev, tp);
166 }
167
168 int
pconsclose(dev_t dev,int flag,int mode,struct lwp * l)169 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
170 {
171 struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev));
172 struct tty *tp = sc->of_tty;
173
174 callout_stop(&sc->sc_poll_ch);
175 sc->of_flags &= ~OFPOLL;
176 (*tp->t_linesw->l_close)(tp, flag);
177 ttyclose(tp);
178 return 0;
179 }
180
181 int
pconsread(dev_t dev,struct uio * uio,int flag)182 pconsread(dev_t dev, struct uio *uio, int flag)
183 {
184 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
185 struct tty *tp = sc->of_tty;
186
187 return (*tp->t_linesw->l_read)(tp, uio, flag);
188 }
189
190 int
pconswrite(dev_t dev,struct uio * uio,int flag)191 pconswrite(dev_t dev, struct uio *uio, int flag)
192 {
193 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
194 struct tty *tp = sc->of_tty;
195
196 return (*tp->t_linesw->l_write)(tp, uio, flag);
197 }
198
199 int
pconspoll(dev_t dev,int events,struct lwp * l)200 pconspoll(dev_t dev, int events, struct lwp *l)
201 {
202 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
203 struct tty *tp = sc->of_tty;
204
205 return ((*tp->t_linesw->l_poll)(tp, events, l));
206 }
207
208 int
pconsioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)209 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
210 {
211 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
212 struct tty *tp = sc->of_tty;
213 int error;
214
215 if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
216 return error;
217 return ttioctl(tp, cmd, data, flag, l);
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 u_char 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_write(prom_stdout(), 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 tp->t_ispeed = t->c_ispeed;
258 tp->t_ospeed = t->c_ospeed;
259 tp->t_cflag = t->c_cflag;
260 return 0;
261 }
262
263 static void
pcons_poll(void * aux)264 pcons_poll(void *aux)
265 {
266 struct pconssoftc *sc = aux;
267 struct tty *tp = sc->of_tty;
268 char ch;
269
270 while (prom_read(prom_stdin(), &ch, 1) > 0) {
271 cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
272 if (tp && (tp->t_state & TS_ISOPEN))
273 (*tp->t_linesw->l_rint)(ch, tp);
274 }
275 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
276 }
277
278 int
pconsprobe(void)279 pconsprobe(void)
280 {
281
282 return (prom_stdin() && prom_stdout());
283 }
284
285 void
pcons_cnpollc(dev_t dev,int on)286 pcons_cnpollc(dev_t dev, int on)
287 {
288 struct pconssoftc *sc;
289
290 sc = device_lookup_private(&pcons_cd, minor(dev));
291 if (sc == NULL)
292 return;
293
294 if (on) {
295 if (sc->of_flags & OFPOLL)
296 callout_stop(&sc->sc_poll_ch);
297 sc->of_flags &= ~OFPOLL;
298 } else {
299 /* Resuming kernel. */
300 if (!(sc->of_flags & OFPOLL)) {
301 sc->of_flags |= OFPOLL;
302 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
303 }
304 }
305 }
306
307 void pcons_dopoll(void);
308 void
pcons_dopoll(void)309 pcons_dopoll(void)
310 {
311 pcons_poll(device_lookup_private(&pcons_cd, 0));
312 }
313