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[FreeBSD/FreeBSD.git] / sys / dev / uart / uart_tty.c
1 /*-
2  * Copyright (c) 2003 Marcel Moolenaar
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/conf.h>
34 #include <sys/cons.h>
35 #include <sys/fcntl.h>
36 #include <sys/interrupt.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/reboot.h>
40 #include <machine/bus.h>
41 #include <sys/rman.h>
42 #include <sys/termios.h>
43 #include <sys/tty.h>
44 #include <machine/resource.h>
45 #include <machine/stdarg.h>
46
47 #include <dev/uart/uart.h>
48 #include <dev/uart/uart_bus.h>
49 #include <dev/uart/uart_cpu.h>
50
51 #include "uart_if.h"
52
53 static cn_probe_t uart_cnprobe;
54 static cn_init_t uart_cninit;
55 static cn_term_t uart_cnterm;
56 static cn_getc_t uart_cngetc;
57 static cn_checkc_t uart_cncheckc;
58 static cn_putc_t uart_cnputc;
59
60 CONS_DRIVER(uart, uart_cnprobe, uart_cninit, uart_cnterm, uart_cngetc,
61     uart_cncheckc, uart_cnputc, NULL);
62
63 static struct uart_devinfo uart_console;
64
65 static void
66 uart_cnprobe(struct consdev *cp)
67 {
68
69         cp->cn_pri = CN_DEAD;
70
71         KASSERT(uart_console.cookie == NULL, ("foo"));
72
73         if (uart_cpu_getdev(UART_DEV_CONSOLE, &uart_console))
74                 return;
75
76         if (uart_probe(&uart_console))
77                 return;
78
79         cp->cn_pri = (boothowto & RB_SERIAL) ? CN_REMOTE : CN_NORMAL;
80         cp->cn_arg = &uart_console;
81 }
82
83 static void
84 uart_cninit(struct consdev *cp)
85 {
86         struct uart_devinfo *di;
87
88         /*
89          * Yedi trick: we need to be able to define cn_dev before we go
90          * single- or multi-user. The problem is that we don't know at
91          * this time what the device will be. Hence, we need to link from
92          * the uart_devinfo to the consdev that corresponds to it so that
93          * we can define cn_dev in uart_bus_attach() when we find the
94          * device during bus enumeration. That's when we'll know what the
95          * the unit number will be.
96          */
97         di = cp->cn_arg;
98         KASSERT(di->cookie == NULL, ("foo"));
99         di->cookie = cp;
100         di->type = UART_DEV_CONSOLE;
101         uart_add_sysdev(di);
102         uart_init(di);
103 }
104
105 static void
106 uart_cnterm(struct consdev *cp)
107 {
108
109         uart_term(cp->cn_arg);
110 }
111
112 static void
113 uart_cnputc(struct consdev *cp, int c)
114 {
115
116         uart_putc(cp->cn_arg, c);
117 }
118
119 static int
120 uart_cncheckc(struct consdev *cp)
121 {
122
123         return (uart_poll(cp->cn_arg));
124 }
125
126 static int
127 uart_cngetc(struct consdev *cp)
128 {
129
130         return (uart_getc(cp->cn_arg));
131 }
132
133 static int
134 uart_tty_open(struct tty *tp, struct cdev *dev)
135 {
136         struct uart_softc *sc;
137
138         sc = tp->t_sc;
139         sc->sc_opened = 1;
140         return (0);
141 }
142
143 static void
144 uart_tty_close(struct tty *tp)
145 {
146         struct uart_softc *sc;
147
148         sc = tp->t_sc;
149         if (sc == NULL || sc->sc_leaving || !sc->sc_opened) 
150                 return;
151
152         if (sc->sc_hwiflow)
153                 UART_IOCTL(sc, UART_IOCTL_IFLOW, 0);
154         if (sc->sc_hwoflow)
155                 UART_IOCTL(sc, UART_IOCTL_OFLOW, 0);
156         if (sc->sc_sysdev == NULL)
157                 UART_SETSIG(sc, SER_DDTR | SER_DRTS);
158
159         wakeup(sc);
160         sc->sc_opened = 0;
161         return;
162 }
163
164 static void
165 uart_tty_oproc(struct tty *tp)
166 {
167         struct uart_softc *sc;
168
169         sc = tp->t_sc;
170         if (sc == NULL || sc->sc_leaving)
171                 return;
172
173         /*
174          * Handle input flow control. Note that if we have hardware support,
175          * we don't do anything here. We continue to receive until our buffer
176          * is full. At that time we cannot empty the UART itself and it will
177          * de-assert RTS for us. In that situation we're completely stuffed.
178          * Without hardware support, we need to toggle RTS ourselves.
179          */
180         if ((tp->t_cflag & CRTS_IFLOW) && !sc->sc_hwiflow) {
181                 if ((tp->t_state & TS_TBLOCK) &&
182                     (sc->sc_hwsig & SER_RTS))
183                         UART_SETSIG(sc, SER_DRTS);
184                 else if (!(tp->t_state & TS_TBLOCK) &&
185                     !(sc->sc_hwsig & SER_RTS))
186                         UART_SETSIG(sc, SER_DRTS|SER_RTS);
187         }
188
189         if (tp->t_state & TS_TTSTOP)
190                 return;
191
192         if ((tp->t_state & TS_BUSY) || sc->sc_txbusy)
193                 return;
194
195         if (tp->t_outq.c_cc == 0) {
196                 ttwwakeup(tp);
197                 return;
198         }
199
200         sc->sc_txdatasz = q_to_b(&tp->t_outq, sc->sc_txbuf, sc->sc_txfifosz);
201         tp->t_state |= TS_BUSY;
202         UART_TRANSMIT(sc);
203         ttwwakeup(tp);
204 }
205
206 static int
207 uart_tty_param(struct tty *tp, struct termios *t)
208 {
209         struct uart_softc *sc;
210         int databits, parity, stopbits;
211
212         sc = tp->t_sc;
213         if (sc == NULL || sc->sc_leaving)
214                 return (ENODEV);
215         if (t->c_ispeed != t->c_ospeed && t->c_ospeed != 0)
216                 return (EINVAL);
217         /* Fixate certain parameters for system devices. */
218         if (sc->sc_sysdev != NULL) {
219                 t->c_ispeed = t->c_ospeed = sc->sc_sysdev->baudrate;
220                 t->c_cflag |= CLOCAL;
221                 t->c_cflag &= ~HUPCL;
222         }
223         if (t->c_ospeed == 0) {
224                 UART_SETSIG(sc, SER_DDTR | SER_DRTS);
225                 return (0);
226         }
227         switch (t->c_cflag & CSIZE) {
228         case CS5:       databits = 5; break;
229         case CS6:       databits = 6; break;
230         case CS7:       databits = 7; break;
231         default:        databits = 8; break;
232         }
233         stopbits = (t->c_cflag & CSTOPB) ? 2 : 1;
234         if (t->c_cflag & PARENB)
235                 parity = (t->c_cflag & PARODD) ? UART_PARITY_ODD
236                     : UART_PARITY_EVEN;
237         else
238                 parity = UART_PARITY_NONE;
239         if (UART_PARAM(sc, t->c_ospeed, databits, stopbits, parity) != 0)
240                 return (EINVAL);
241         UART_SETSIG(sc, SER_DDTR | SER_DTR);
242         /* Set input flow control state. */
243         if (!sc->sc_hwiflow) {
244                 if ((t->c_cflag & CRTS_IFLOW) && (tp->t_state & TS_TBLOCK))
245                         UART_SETSIG(sc, SER_DRTS);
246                 else
247                         UART_SETSIG(sc, SER_DRTS | SER_RTS);
248         } else
249                 UART_IOCTL(sc, UART_IOCTL_IFLOW, (t->c_cflag & CRTS_IFLOW));
250         /* Set output flow control state. */
251         if (sc->sc_hwoflow)
252                 UART_IOCTL(sc, UART_IOCTL_OFLOW, (t->c_cflag & CCTS_OFLOW));
253         ttsetwater(tp);
254         return (0);
255 }
256
257 static int
258 uart_tty_modem(struct tty *tp, int biton, int bitoff)
259 {
260         struct uart_softc *sc;
261
262         sc = tp->t_sc;
263         if (biton != 0 || bitoff != 0)
264                 UART_SETSIG(sc, SER_DELTA(bitoff|biton) | biton);
265         return (sc->sc_hwsig);
266 }
267
268 static void
269 uart_tty_break(struct tty *tp, int state)
270 {
271         struct uart_softc *sc;
272
273         sc = tp->t_sc;
274         UART_IOCTL(sc, UART_IOCTL_BREAK, state);
275 }
276
277 static void
278 uart_tty_stop(struct tty *tp, int rw)
279 {
280         struct uart_softc *sc;
281
282         sc = tp->t_sc;
283         if (sc == NULL || sc->sc_leaving)
284                 return;
285         if (rw & FWRITE) {
286                 if (sc->sc_txbusy) {
287                         sc->sc_txbusy = 0;
288                         UART_FLUSH(sc, UART_FLUSH_TRANSMITTER);
289                 }
290                 tp->t_state &= ~TS_BUSY;
291         }
292         if (rw & FREAD) {
293                 UART_FLUSH(sc, UART_FLUSH_RECEIVER);
294                 sc->sc_rxget = sc->sc_rxput = 0;
295         }
296 }
297
298 void
299 uart_tty_intr(void *arg)
300 {
301         struct uart_softc *sc = arg;
302         struct tty *tp;
303         int c, pend, sig, xc;
304
305         if (sc->sc_leaving)
306                 return;
307
308         pend = atomic_readandclear_32(&sc->sc_ttypend);
309         if (!(pend & UART_IPEND_MASK))
310                 return;
311
312         tp = sc->sc_u.u_tty.tp;
313
314         if (pend & UART_IPEND_RXREADY) {
315                 while (!uart_rx_empty(sc) && !(tp->t_state & TS_TBLOCK)) {
316                         xc = uart_rx_get(sc);
317                         c = xc & 0xff;
318                         if (xc & UART_STAT_FRAMERR)
319                                 c |= TTY_FE;
320                         if (xc & UART_STAT_PARERR)
321                                 c |= TTY_PE;
322                         ttyld_rint(tp, c);
323                 }
324         }
325
326         if (pend & UART_IPEND_BREAK) {
327                 if (tp != NULL && !(tp->t_iflag & IGNBRK))
328                         ttyld_rint(tp, 0);
329         }
330
331         if (pend & UART_IPEND_SIGCHG) {
332                 sig = pend & UART_IPEND_SIGMASK;
333                 if (sig & SER_DDCD)
334                         ttyld_modem(tp, sig & SER_DCD);
335                 if ((sig & SER_DCTS) && (tp->t_cflag & CCTS_OFLOW) &&
336                     !sc->sc_hwoflow) {
337                         if (sig & SER_CTS) {
338                                 tp->t_state &= ~TS_TTSTOP;
339                                 ttyld_start(tp);
340                         } else
341                                 tp->t_state |= TS_TTSTOP;
342                 }
343         }
344
345         if (pend & UART_IPEND_TXIDLE) {
346                 tp->t_state &= ~TS_BUSY;
347                 ttyld_start(tp);
348         }
349 }
350
351 int
352 uart_tty_attach(struct uart_softc *sc)
353 {
354         struct tty *tp;
355         int unit;
356
357         tp = ttyalloc();
358         sc->sc_u.u_tty.tp = tp;
359         tp->t_sc = sc;
360
361         unit = device_get_unit(sc->sc_dev);
362
363         tp->t_oproc = uart_tty_oproc;
364         tp->t_param = uart_tty_param;
365         tp->t_stop = uart_tty_stop;
366         tp->t_modem = uart_tty_modem;
367         tp->t_break = uart_tty_break;
368         tp->t_open = uart_tty_open;
369         tp->t_close = uart_tty_close;
370
371         tp->t_pps = &sc->sc_pps;
372
373         if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) {
374                 sprintf(((struct consdev *)sc->sc_sysdev->cookie)->cn_name,
375                     "ttyu%r", unit);
376                 ttyconsolemode(tp, 0);
377         }
378
379         swi_add(&tty_ithd, uart_driver_name, uart_tty_intr, sc, SWI_TTY,
380             INTR_TYPE_TTY, &sc->sc_softih);
381
382         ttycreate(tp, NULL, 0, MINOR_CALLOUT, "u%r", unit);
383
384         return (0);
385 }
386
387 int uart_tty_detach(struct uart_softc *sc)
388 {
389         struct tty *tp;
390
391         tp = sc->sc_u.u_tty.tp;
392         tp->t_pps = NULL;
393         ttygone(tp);
394         ithread_remove_handler(sc->sc_softih);
395         ttyfree(tp);
396
397         return (0);
398 }