1 /* $NetBSD: arcbios_tty.c,v 1.25 2014/07/25 08:10:36 dholland Exp $ */
2
3 /*
4 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22 * School of Computer Science
23 * Carnegie Mellon University
24 * Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30 #include <sys/cdefs.h>
31 __KERNEL_RCSID(0, "$NetBSD: arcbios_tty.c,v 1.25 2014/07/25 08:10:36 dholland Exp $");
32
33 #include <sys/param.h>
34 #include <sys/uio.h>
35 #include <sys/systm.h>
36 #include <sys/callout.h>
37 #include <sys/kernel.h>
38 #include <sys/conf.h>
39 #include <sys/proc.h>
40 #include <sys/tty.h>
41 #include <sys/termios.h>
42 #include <sys/kauth.h>
43
44 #include <dev/cons.h>
45
46 #include <dev/arcbios/arcbios.h>
47 #include <dev/arcbios/arcbiosvar.h>
48
49 callout_t arcbios_tty_ch;
50 bool arcbios_ch_init;
51 static struct tty *arcbios_tty[1];
52
53 void arcbios_tty_start(struct tty *);
54 void arcbios_tty_poll(void *);
55 int arcbios_tty_param(struct tty *, struct termios *);
56
57 dev_type_open(arcbios_ttyopen);
58 dev_type_close(arcbios_ttyclose);
59 dev_type_read(arcbios_ttyread);
60 dev_type_write(arcbios_ttywrite);
61 dev_type_ioctl(arcbios_ttyioctl);
62 dev_type_stop(arcbios_ttystop);
63 dev_type_tty(arcbios_ttytty);
64 dev_type_poll(arcbios_ttypoll);
65
66 const struct cdevsw arcbios_cdevsw = {
67 .d_open = arcbios_ttyopen,
68 .d_close = arcbios_ttyclose,
69 .d_read = arcbios_ttyread,
70 .d_write = arcbios_ttywrite,
71 .d_ioctl = arcbios_ttyioctl,
72 .d_stop = arcbios_ttystop,
73 .d_tty = arcbios_ttytty,
74 .d_poll = arcbios_ttypoll,
75 .d_mmap = nommap,
76 .d_kqfilter = ttykqfilter,
77 .d_discard = nodiscard,
78 .d_flag = D_TTY,
79 };
80
81 int
arcbios_ttyopen(dev_t dev,int flag,int mode,struct lwp * l)82 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l)
83 {
84 int unit = minor(dev);
85 struct tty *tp;
86 int s, error = 0, setuptimeout = 0;
87
88 if (!arcbios_ch_init) {
89 arcbios_ch_init = true;
90 callout_init(&arcbios_tty_ch, 0);
91 }
92
93 if (unit != 0)
94 return (ENODEV);
95
96 s = spltty();
97
98 if (arcbios_tty[unit] == NULL) {
99 tp = arcbios_tty[unit] = tty_alloc();
100 tty_attach(tp);
101 } else
102 tp = arcbios_tty[unit];
103
104 tp->t_oproc = arcbios_tty_start;
105 tp->t_param = arcbios_tty_param;
106 tp->t_dev = dev;
107
108 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) {
109 splx(s);
110 return (EBUSY);
111 }
112
113 if ((tp->t_state & TS_ISOPEN) == 0) {
114 tp->t_state |= TS_CARR_ON;
115 ttychars(tp);
116 tp->t_iflag = TTYDEF_IFLAG;
117 tp->t_oflag = TTYDEF_OFLAG;
118 tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
119 tp->t_lflag = TTYDEF_LFLAG;
120 tp->t_ispeed = tp->t_ospeed = 9600;
121 ttsetwater(tp);
122
123 setuptimeout = 1;
124 }
125
126 splx(s);
127
128 error = (*tp->t_linesw->l_open)(dev, tp);
129 if (error == 0 && setuptimeout)
130 callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
131
132 return (error);
133 }
134
135 int
arcbios_ttyclose(dev_t dev,int flag,int mode,struct lwp * l)136 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
137 {
138 int unit = minor(dev);
139 struct tty *tp = arcbios_tty[unit];
140
141 callout_stop(&arcbios_tty_ch);
142 (*tp->t_linesw->l_close)(tp, flag);
143 ttyclose(tp);
144 return (0);
145 }
146
147 int
arcbios_ttyread(dev_t dev,struct uio * uio,int flag)148 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
149 {
150 struct tty *tp = arcbios_tty[minor(dev)];
151
152 return ((*tp->t_linesw->l_read)(tp, uio, flag));
153 }
154
155 int
arcbios_ttywrite(dev_t dev,struct uio * uio,int flag)156 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
157 {
158 struct tty *tp = arcbios_tty[minor(dev)];
159
160 return ((*tp->t_linesw->l_write)(tp, uio, flag));
161 }
162
163 int
arcbios_ttypoll(dev_t dev,int events,struct lwp * l)164 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
165 {
166 struct tty *tp = arcbios_tty[minor(dev)];
167
168 return ((*tp->t_linesw->l_poll)(tp, events, l));
169 }
170
171 int
arcbios_ttyioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)172 arcbios_ttyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
173 {
174 int unit = minor(dev);
175 struct tty *tp = arcbios_tty[unit];
176 int error;
177
178 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
179 if (error != EPASSTHROUGH)
180 return (error);
181 return (ttioctl(tp, cmd, data, flag, l));
182 }
183
184 int
arcbios_tty_param(struct tty * tp,struct termios * t)185 arcbios_tty_param(struct tty *tp, struct termios *t)
186 {
187
188 return (0);
189 }
190
191 void
arcbios_tty_start(struct tty * tp)192 arcbios_tty_start(struct tty *tp)
193 {
194 u_long count;
195 int s;
196
197 s = spltty();
198 if (tp->t_state & (TS_TTSTOP | TS_BUSY))
199 goto out;
200 ttypull(tp);
201 tp->t_state |= TS_BUSY;
202 while (tp->t_outq.c_cc != 0) {
203 arcbios_Write(ARCBIOS_STDOUT, tp->t_outq.c_cf,
204 ndqb(&tp->t_outq, 0), &count);
205 ndflush(&tp->t_outq, count);
206 }
207 tp->t_state &= ~TS_BUSY;
208 out:
209 splx(s);
210 }
211
212 void
arcbios_ttystop(struct tty * tp,int flag)213 arcbios_ttystop(struct tty *tp, int flag)
214 {
215 int s;
216
217 s = spltty();
218 if (tp->t_state & TS_BUSY)
219 if ((tp->t_state & TS_TTSTOP) == 0)
220 tp->t_state |= TS_FLUSH;
221 splx(s);
222 }
223
224 static int
arcbios_tty_getchar(int * cp)225 arcbios_tty_getchar(int *cp)
226 {
227 char c;
228 int32_t q;
229 u_long count;
230
231 q = arcbios_GetReadStatus(ARCBIOS_STDIN);
232
233 if (q == 0) {
234 arcbios_Read(ARCBIOS_STDIN, &c, 1, &count);
235 *cp = c;
236
237 return 1;
238 }
239
240 return 0;
241 }
242
243 void
arcbios_tty_poll(void * v)244 arcbios_tty_poll(void *v)
245 {
246 struct tty *tp = v;
247 int c;
248
249 while (arcbios_tty_getchar(&c)) {
250 if (tp->t_state & TS_ISOPEN)
251 (void)(*tp->t_linesw->l_rint)(c, tp);
252 }
253 callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
254 }
255
256 struct tty *
arcbios_ttytty(dev_t dev)257 arcbios_ttytty(dev_t dev)
258 {
259
260 if (minor(dev) != 0)
261 panic("arcbios_ttytty: bogus");
262
263 return (arcbios_tty[0]);
264 }
265