FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/com.c
1 /* $NetBSD: com.c,v 1.382 2022/12/09 00:35:58 knakahara Exp $ */
2
3 /*-
4 * Copyright (c) 1998, 1999, 2004, 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1991 The Regents of the University of California.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)com.c 7.5 (Berkeley) 5/16/91
61 */
62
63 /*
64 * COM driver, uses National Semiconductor NS16450/NS16550AF UART
65 * Supports automatic hardware flow control on StarTech ST16C650A UART
66 *
67 * Lock order:
68 * tty_lock (IPL_VM)
69 * -> sc->sc_lock (IPL_HIGH)
70 */
71
72 #include <sys/cdefs.h>
73 __KERNEL_RCSID(0, "$NetBSD: com.c,v 1.382 2022/12/09 00:35:58 knakahara Exp $");
74
75 #include "opt_com.h"
76 #include "opt_ddb.h"
77 #include "opt_kgdb.h"
78 #include "opt_lockdebug.h"
79 #include "opt_multiprocessor.h"
80 #include "opt_ntp.h"
81
82 /* The COM16650 option was renamed to COM_16650. */
83 #ifdef COM16650
84 #error Obsolete COM16650 option; use COM_16650 instead.
85 #endif
86
87 /*
88 * Override cnmagic(9) macro before including <sys/systm.h>.
89 * We need to know if cn_check_magic triggered debugger, so set a flag.
90 * Callers of cn_check_magic must declare int cn_trapped = 0;
91 * XXX: this is *ugly*!
92 */
93 #define cn_trap() \
94 do { \
95 console_debugger(); \
96 cn_trapped = 1; \
97 (void)cn_trapped; \
98 } while (/* CONSTCOND */ 0)
99
100 #include <sys/param.h>
101 #include <sys/systm.h>
102 #include <sys/ioctl.h>
103 #include <sys/select.h>
104 #include <sys/poll.h>
105 #include <sys/tty.h>
106 #include <sys/proc.h>
107 #include <sys/conf.h>
108 #include <sys/file.h>
109 #include <sys/uio.h>
110 #include <sys/kernel.h>
111 #include <sys/syslog.h>
112 #include <sys/device.h>
113 #include <sys/malloc.h>
114 #include <sys/timepps.h>
115 #include <sys/vnode.h>
116 #include <sys/kauth.h>
117 #include <sys/intr.h>
118 #ifdef RND_COM
119 #include <sys/rndsource.h>
120 #endif
121
122 #include <sys/bus.h>
123
124 #include <ddb/db_active.h>
125
126 #include <dev/ic/comreg.h>
127 #include <dev/ic/comvar.h>
128 #include <dev/ic/ns16550reg.h>
129 #include <dev/ic/st16650reg.h>
130 #include <dev/ic/hayespreg.h>
131 #define com_lcr com_cfcr
132 #include <dev/cons.h>
133
134 #include "ioconf.h"
135
136 #define CSR_READ_1(r, o) \
137 (r)->cr_read((r), (r)->cr_map[o])
138 #define CSR_WRITE_1(r, o, v) \
139 (r)->cr_write((r), (r)->cr_map[o], (v))
140 #define CSR_WRITE_MULTI(r, o, p, n) \
141 (r)->cr_write_multi((r), (r)->cr_map[o], (p), (n))
142
143 /*
144 * XXX COM_TYPE_AU1x00 specific
145 */
146 #define CSR_WRITE_2(r, o, v) \
147 bus_space_write_2((r)->cr_iot, (r)->cr_ioh, (r)->cr_map[o], v)
148 #define CSR_READ_2(r, o) \
149 bus_space_read_2((r)->cr_iot, (r)->cr_ioh, (r)->cr_map[o])
150
151 static void com_enable_debugport(struct com_softc *);
152
153 void com_config(struct com_softc *);
154 void com_shutdown(struct com_softc *);
155 int comspeed(long, long, int);
156 static u_char cflag2lcr(tcflag_t);
157 int comparam(struct tty *, struct termios *);
158 void comstart(struct tty *);
159 int comhwiflow(struct tty *, int);
160
161 void com_loadchannelregs(struct com_softc *);
162 void com_hwiflow(struct com_softc *);
163 void com_break(struct com_softc *, int);
164 void com_modem(struct com_softc *, int);
165 void tiocm_to_com(struct com_softc *, u_long, int);
166 int com_to_tiocm(struct com_softc *);
167 void com_iflush(struct com_softc *);
168
169 int com_common_getc(dev_t, struct com_regs *);
170 static void com_common_putc(dev_t, struct com_regs *, int, int);
171
172 int cominit(struct com_regs *, int, int, int, tcflag_t);
173
174 static int comcnreattach(void);
175
176 int comcngetc(dev_t);
177 void comcnputc(dev_t, int);
178 void comcnpollc(dev_t, int);
179
180 void comsoft(void *);
181 static inline void com_rxsoft(struct com_softc *, struct tty *);
182 static inline void com_txsoft(struct com_softc *, struct tty *);
183 static inline void com_stsoft(struct com_softc *, struct tty *);
184 static inline void com_schedrx(struct com_softc *);
185 void comdiag(void *);
186
187 dev_type_open(comopen);
188 dev_type_close(comclose);
189 dev_type_read(comread);
190 dev_type_write(comwrite);
191 dev_type_ioctl(comioctl);
192 dev_type_stop(comstop);
193 dev_type_tty(comtty);
194 dev_type_poll(compoll);
195
196 static struct comcons_info comcons_info;
197
198 /*
199 * Following are all routines needed for COM to act as console
200 */
201 static struct consdev comcons = {
202 .cn_getc = comcngetc,
203 .cn_putc = comcnputc,
204 .cn_pollc = comcnpollc,
205 .cn_dev = NODEV,
206 .cn_pri = CN_NORMAL
207 };
208
209
210 const struct cdevsw com_cdevsw = {
211 .d_open = comopen,
212 .d_close = comclose,
213 .d_read = comread,
214 .d_write = comwrite,
215 .d_ioctl = comioctl,
216 .d_stop = comstop,
217 .d_tty = comtty,
218 .d_poll = compoll,
219 .d_mmap = nommap,
220 .d_kqfilter = ttykqfilter,
221 .d_discard = nodiscard,
222 .d_flag = D_TTY
223 };
224
225 /*
226 * Make this an option variable one can patch.
227 * But be warned: this must be a power of 2!
228 */
229 u_int com_rbuf_size = COM_RING_SIZE;
230
231 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
232 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4;
233 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4;
234
235 static int comconsattached;
236 static struct cnm_state com_cnm_state;
237
238 #ifdef KGDB
239 #include <sys/kgdb.h>
240
241 static struct com_regs comkgdbregs;
242 static int com_kgdb_attached;
243
244 int com_kgdb_getc(void *);
245 void com_kgdb_putc(void *, int);
246 #endif /* KGDB */
247
248 /* initializer for typical 16550-ish hardware */
249 static const bus_size_t com_std_map[COM_REGMAP_NENTRIES] = {
250 [COM_REG_RXDATA] = com_data,
251 [COM_REG_TXDATA] = com_data,
252 [COM_REG_DLBL] = com_dlbl,
253 [COM_REG_DLBH] = com_dlbh,
254 [COM_REG_IER] = com_ier,
255 [COM_REG_IIR] = com_iir,
256 [COM_REG_FIFO] = com_fifo,
257 [COM_REG_TCR] = com_fifo,
258 [COM_REG_EFR] = com_efr,
259 [COM_REG_TLR] = com_efr,
260 [COM_REG_LCR] = com_lcr,
261 [COM_REG_MCR] = com_mcr,
262 [COM_REG_LSR] = com_lsr,
263 [COM_REG_MSR] = com_msr,
264 [COM_REG_USR] = com_usr,
265 [COM_REG_TFL] = com_tfl,
266 [COM_REG_RFL] = com_rfl,
267 [COM_REG_HALT] = com_halt,
268 [COM_REG_MDR1] = com_mdr1,
269 };
270
271 #define COMDIALOUT_MASK TTDIALOUT_MASK
272
273 #define COMUNIT(x) TTUNIT(x)
274 #define COMDIALOUT(x) TTDIALOUT(x)
275
276 #define COM_ISALIVE(sc) ((sc)->enabled != 0 && \
277 device_is_active((sc)->sc_dev))
278
279 #define BR BUS_SPACE_BARRIER_READ
280 #define BW BUS_SPACE_BARRIER_WRITE
281 #define COM_BARRIER(r, f) \
282 bus_space_barrier((r)->cr_iot, (r)->cr_ioh, 0, (r)->cr_nports, (f))
283
284 /*
285 * com_read_1 --
286 * Default register read callback using single byte accesses.
287 */
288 static uint8_t
289 com_read_1(struct com_regs *regs, u_int reg)
290 {
291 return bus_space_read_1(regs->cr_iot, regs->cr_ioh, reg);
292 }
293
294 /*
295 * com_write_1 --
296 * Default register write callback using single byte accesses.
297 */
298 static void
299 com_write_1(struct com_regs *regs, u_int reg, uint8_t val)
300 {
301 bus_space_write_1(regs->cr_iot, regs->cr_ioh, reg, val);
302 }
303
304 /*
305 * com_write_multi_1 --
306 * Default register multi write callback using single byte accesses.
307 */
308 static void
309 com_write_multi_1(struct com_regs *regs, u_int reg, const uint8_t *datap,
310 bus_size_t count)
311 {
312 bus_space_write_multi_1(regs->cr_iot, regs->cr_ioh, reg, datap, count);
313 }
314
315 /*
316 * com_read_4 --
317 * Default register read callback using dword accesses.
318 */
319 static uint8_t
320 com_read_4(struct com_regs *regs, u_int reg)
321 {
322 return bus_space_read_4(regs->cr_iot, regs->cr_ioh, reg) & 0xff;
323 }
324
325 /*
326 * com_write_4 --
327 * Default register write callback using dword accesses.
328 */
329 static void
330 com_write_4(struct com_regs *regs, u_int reg, uint8_t val)
331 {
332 bus_space_write_4(regs->cr_iot, regs->cr_ioh, reg, val);
333 }
334
335 /*
336 * com_write_multi_4 --
337 * Default register multi write callback using dword accesses.
338 */
339 static void
340 com_write_multi_4(struct com_regs *regs, u_int reg, const uint8_t *datap,
341 bus_size_t count)
342 {
343 while (count-- > 0) {
344 bus_space_write_4(regs->cr_iot, regs->cr_ioh, reg, *datap++);
345 }
346 }
347
348 /*
349 * com_init_regs --
350 * Driver front-ends use this to initialize our register map
351 * in the standard fashion. They may then tailor the map to
352 * their own particular requirements.
353 */
354 void
355 com_init_regs(struct com_regs *regs, bus_space_tag_t st, bus_space_handle_t sh,
356 bus_addr_t addr)
357 {
358
359 memset(regs, 0, sizeof(*regs));
360 regs->cr_iot = st;
361 regs->cr_ioh = sh;
362 regs->cr_iobase = addr;
363 regs->cr_nports = COM_NPORTS;
364 regs->cr_read = com_read_1;
365 regs->cr_write = com_write_1;
366 regs->cr_write_multi = com_write_multi_1;
367 memcpy(regs->cr_map, com_std_map, sizeof(regs->cr_map));
368 }
369
370 /*
371 * com_init_regs_stride --
372 * Convenience function for front-ends that have a stride between
373 * registers.
374 */
375 void
376 com_init_regs_stride(struct com_regs *regs, bus_space_tag_t st,
377 bus_space_handle_t sh, bus_addr_t addr, u_int regshift)
378 {
379
380 com_init_regs(regs, st, sh, addr);
381 for (size_t i = 0; i < __arraycount(regs->cr_map); i++) {
382 regs->cr_map[i] <<= regshift;
383 }
384 regs->cr_nports <<= regshift;
385 }
386
387 /*
388 * com_init_regs_stride_width --
389 * Convenience function for front-ends that have a stride between
390 * registers and specific I/O width requirements.
391 */
392 void
393 com_init_regs_stride_width(struct com_regs *regs, bus_space_tag_t st,
394 bus_space_handle_t sh, bus_addr_t addr,
395 u_int regshift, u_int width)
396 {
397
398 com_init_regs(regs, st, sh, addr);
399 for (size_t i = 0; i < __arraycount(regs->cr_map); i++) {
400 regs->cr_map[i] <<= regshift;
401 }
402 regs->cr_nports <<= regshift;
403
404 switch (width) {
405 case 1:
406 /* Already set by com_init_regs */
407 break;
408 case 4:
409 regs->cr_read = com_read_4;
410 regs->cr_write = com_write_4;
411 regs->cr_write_multi = com_write_multi_4;
412 break;
413 default:
414 panic("com: unsupported I/O width %d", width);
415 }
416 }
417
418 /*ARGSUSED*/
419 int
420 comspeed(long speed, long frequency, int type)
421 {
422 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
423
424 int x, err;
425 int divisor = 16;
426
427 if ((type == COM_TYPE_OMAP) && (speed > 230400)) {
428 divisor = 13;
429 }
430
431 if (speed == 0)
432 return (0);
433 if (speed < 0)
434 return (-1);
435 x = divrnd(frequency / divisor, speed);
436 if (x <= 0)
437 return (-1);
438 err = divrnd(((quad_t)frequency) * 1000 / divisor, speed * x) - 1000;
439 if (err < 0)
440 err = -err;
441 if (err > COM_TOLERANCE)
442 return (-1);
443 return (x);
444
445 #undef divrnd
446 }
447
448 #ifdef COM_DEBUG
449 int com_debug = 0;
450
451 void comstatus(struct com_softc *, const char *);
452 void
453 comstatus(struct com_softc *sc, const char *str)
454 {
455 struct tty *tp = sc->sc_tty;
456
457 aprint_normal_dev(sc->sc_dev,
458 "%s %cclocal %cdcd %cts_carr_on %cdtr %ctx_stopped\n",
459 str,
460 ISSET(tp->t_cflag, CLOCAL) ? '+' : '-',
461 ISSET(sc->sc_msr, MSR_DCD) ? '+' : '-',
462 ISSET(tp->t_state, TS_CARR_ON) ? '+' : '-',
463 ISSET(sc->sc_mcr, MCR_DTR) ? '+' : '-',
464 sc->sc_tx_stopped ? '+' : '-');
465
466 aprint_normal_dev(sc->sc_dev,
467 "%s %ccrtscts %ccts %cts_ttstop %crts rx_flags=0x%x\n",
468 str,
469 ISSET(tp->t_cflag, CRTSCTS) ? '+' : '-',
470 ISSET(sc->sc_msr, MSR_CTS) ? '+' : '-',
471 ISSET(tp->t_state, TS_TTSTOP) ? '+' : '-',
472 ISSET(sc->sc_mcr, MCR_RTS) ? '+' : '-',
473 sc->sc_rx_flags);
474 }
475 #endif
476
477 int
478 com_probe_subr(struct com_regs *regs)
479 {
480
481 /* force access to id reg */
482 CSR_WRITE_1(regs, COM_REG_LCR, LCR_8BITS);
483 CSR_WRITE_1(regs, COM_REG_IIR, 0);
484 if ((CSR_READ_1(regs, COM_REG_LCR) != LCR_8BITS) ||
485 (CSR_READ_1(regs, COM_REG_IIR) & 0x38))
486 return (0);
487
488 return (1);
489 }
490
491 int
492 comprobe1(bus_space_tag_t iot, bus_space_handle_t ioh)
493 {
494 struct com_regs regs;
495
496 com_init_regs(®s, iot, ioh, 0/*XXX*/);
497
498 return com_probe_subr(®s);
499 }
500
501 /*
502 * No locking in this routine; it is only called during attach,
503 * or with the port already locked.
504 */
505 static void
506 com_enable_debugport(struct com_softc *sc)
507 {
508
509 /* Turn on line break interrupt, set carrier. */
510 sc->sc_ier = IER_ERLS;
511 if (sc->sc_type == COM_TYPE_PXA2x0)
512 sc->sc_ier |= IER_EUART | IER_ERXTOUT;
513 if (sc->sc_type == COM_TYPE_INGENIC ||
514 sc->sc_type == COM_TYPE_TEGRA)
515 sc->sc_ier |= IER_ERXTOUT;
516 CSR_WRITE_1(&sc->sc_regs, COM_REG_IER, sc->sc_ier);
517 SET(sc->sc_mcr, MCR_DTR | MCR_RTS);
518 CSR_WRITE_1(&sc->sc_regs, COM_REG_MCR, sc->sc_mcr);
519 }
520
521 static void
522 com_intr_poll(void *arg)
523 {
524 struct com_softc * const sc = arg;
525
526 comintr(sc);
527
528 callout_schedule(&sc->sc_poll_callout, sc->sc_poll_ticks);
529 }
530
531 void
532 com_attach_subr(struct com_softc *sc)
533 {
534 struct com_regs *regsp = &sc->sc_regs;
535 struct tty *tp;
536 uint32_t cpr;
537 uint8_t lcr;
538 const char *fifo_msg = NULL;
539 prop_dictionary_t dict;
540 bool is_console = true;
541 bool force_console = false;
542
543 aprint_naive("\n");
544
545 dict = device_properties(sc->sc_dev);
546 prop_dictionary_get_bool(dict, "is_console", &is_console);
547 prop_dictionary_get_bool(dict, "force_console", &force_console);
548 callout_init(&sc->sc_diag_callout, 0);
549 callout_init(&sc->sc_poll_callout, 0);
550 callout_setfunc(&sc->sc_poll_callout, com_intr_poll, sc);
551 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH);
552
553 #if defined(COM_16650)
554 sc->sc_type = COM_TYPE_16650;
555 #elif defined(COM_16750)
556 sc->sc_type = COM_TYPE_16750;
557 #elif defined(COM_HAYESP)
558 sc->sc_type = COM_TYPE_HAYESP;
559 #elif defined(COM_PXA2X0)
560 sc->sc_type = COM_TYPE_PXA2x0;
561 #endif
562
563 /* Disable interrupts before configuring the device. */
564 if (sc->sc_type == COM_TYPE_PXA2x0)
565 sc->sc_ier = IER_EUART;
566 else
567 sc->sc_ier = 0;
568
569 CSR_WRITE_1(regsp, COM_REG_IER, sc->sc_ier);
570
571 if ((bus_space_is_equal(regsp->cr_iot, comcons_info.regs.cr_iot) &&
572 regsp->cr_iobase == comcons_info.regs.cr_iobase) || force_console) {
573 comconsattached = 1;
574
575 if (force_console)
576 memcpy(regsp, &comcons_info.regs, sizeof(*regsp));
577
578 if (cn_tab == NULL && comcnreattach() != 0) {
579 printf("can't re-init serial console @%lx\n",
580 (u_long)comcons_info.regs.cr_iobase);
581 }
582
583 switch (sc->sc_type) {
584 case COM_TYPE_16750:
585 case COM_TYPE_DW_APB:
586 /* Use in comintr(). */
587 sc->sc_lcr = cflag2lcr(comcons_info.cflag);
588 break;
589 }
590
591 /* Make sure the console is always "hardwired". */
592 delay(10000); /* wait for output to finish */
593 if (is_console) {
594 SET(sc->sc_hwflags, COM_HW_CONSOLE);
595 }
596
597 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
598 }
599
600 /* Probe for FIFO */
601 switch (sc->sc_type) {
602 case COM_TYPE_HAYESP:
603 goto fifodone;
604
605 case COM_TYPE_AU1x00:
606 sc->sc_fifolen = 16;
607 fifo_msg = "Au1X00 UART";
608 SET(sc->sc_hwflags, COM_HW_FIFO);
609 goto fifodelay;
610
611 case COM_TYPE_16550_NOERS:
612 sc->sc_fifolen = 16;
613 fifo_msg = "ns16650, no ERS";
614 SET(sc->sc_hwflags, COM_HW_FIFO);
615 goto fifodelay;
616
617 case COM_TYPE_OMAP:
618 sc->sc_fifolen = 64;
619 fifo_msg = "OMAP UART";
620 SET(sc->sc_hwflags, COM_HW_FIFO);
621 goto fifodelay;
622
623 case COM_TYPE_INGENIC:
624 sc->sc_fifolen = 16;
625 fifo_msg = "Ingenic UART";
626 SET(sc->sc_hwflags, COM_HW_FIFO);
627 SET(sc->sc_hwflags, COM_HW_NOIEN);
628 goto fifodelay;
629
630 case COM_TYPE_TEGRA:
631 sc->sc_fifolen = 8;
632 fifo_msg = "Tegra UART";
633 SET(sc->sc_hwflags, COM_HW_FIFO);
634 CSR_WRITE_1(regsp, COM_REG_FIFO,
635 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
636 goto fifodelay;
637
638 case COM_TYPE_BCMAUXUART:
639 sc->sc_fifolen = 1;
640 fifo_msg = "BCM AUX UART";
641 SET(sc->sc_hwflags, COM_HW_FIFO);
642 CSR_WRITE_1(regsp, COM_REG_FIFO,
643 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
644 goto fifodelay;
645
646 case COM_TYPE_DW_APB:
647 if (!prop_dictionary_get_uint(dict, "fifolen", &sc->sc_fifolen)) {
648 cpr = bus_space_read_4(sc->sc_regs.cr_iot,
649 sc->sc_regs.cr_ioh, DW_APB_UART_CPR);
650 sc->sc_fifolen = __SHIFTOUT(cpr, UART_CPR_FIFO_MODE) * 16;
651 }
652 if (sc->sc_fifolen == 0) {
653 sc->sc_fifolen = 1;
654 fifo_msg = "DesignWare APB UART, no fifo";
655 CSR_WRITE_1(regsp, COM_REG_FIFO, 0);
656 } else {
657 fifo_msg = "DesignWare APB UART";
658 SET(sc->sc_hwflags, COM_HW_FIFO);
659 CSR_WRITE_1(regsp, COM_REG_FIFO,
660 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
661 }
662 goto fifodelay;
663 }
664
665 sc->sc_fifolen = 1;
666 /* look for a NS 16550AF UART with FIFOs */
667 if (sc->sc_type == COM_TYPE_INGENIC) {
668 CSR_WRITE_1(regsp, COM_REG_FIFO,
669 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
670 FIFO_TRIGGER_14 | FIFO_UART_ON);
671 } else
672 CSR_WRITE_1(regsp, COM_REG_FIFO,
673 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14);
674 delay(100);
675 if (ISSET(CSR_READ_1(regsp, COM_REG_IIR), IIR_FIFO_MASK)
676 == IIR_FIFO_MASK)
677 if (ISSET(CSR_READ_1(regsp, COM_REG_FIFO), FIFO_TRIGGER_14)
678 == FIFO_TRIGGER_14) {
679 SET(sc->sc_hwflags, COM_HW_FIFO);
680
681 fifo_msg = "ns16550a";
682 sc->sc_fifolen = 16;
683
684 /*
685 * IIR changes into the EFR if LCR is set to LCR_EERS
686 * on 16650s. We also know IIR != 0 at this point.
687 * Write 0 into the EFR, and read it. If the result
688 * is 0, we have a 16650.
689 *
690 * Older 16650s were broken; the test to detect them
691 * is taken from the Linux driver. Apparently
692 * setting DLAB enable gives access to the EFR on
693 * these chips.
694 */
695 if (sc->sc_type == COM_TYPE_16650) {
696 lcr = CSR_READ_1(regsp, COM_REG_LCR);
697 CSR_WRITE_1(regsp, COM_REG_LCR, LCR_EERS);
698 CSR_WRITE_1(regsp, COM_REG_EFR, 0);
699 if (CSR_READ_1(regsp, COM_REG_EFR) == 0) {
700 CSR_WRITE_1(regsp, COM_REG_LCR,
701 lcr | LCR_DLAB);
702 if (CSR_READ_1(regsp, COM_REG_EFR) == 0) {
703 CLR(sc->sc_hwflags, COM_HW_FIFO);
704 sc->sc_fifolen = 0;
705 } else {
706 SET(sc->sc_hwflags, COM_HW_FLOW);
707 sc->sc_fifolen = 32;
708 }
709 } else
710 sc->sc_fifolen = 16;
711
712 CSR_WRITE_1(regsp, COM_REG_LCR, lcr);
713 if (sc->sc_fifolen == 0)
714 fifo_msg = "st16650, broken fifo";
715 else if (sc->sc_fifolen == 32)
716 fifo_msg = "st16650a";
717 else
718 fifo_msg = "ns16550a";
719 }
720
721 /*
722 * TL16C750 can enable 64byte FIFO, only when DLAB
723 * is 1. However, some 16750 may always enable. For
724 * example, restrictions according to DLAB in a data
725 * sheet for SC16C750 were not described.
726 * Please enable 'options COM_16650', supposing you
727 * use SC16C750. Probably 32 bytes of FIFO and HW FLOW
728 * should become effective.
729 */
730 if (sc->sc_type == COM_TYPE_16750) {
731 uint8_t iir1, iir2;
732 uint8_t fcr = FIFO_ENABLE | FIFO_TRIGGER_14;
733
734 lcr = CSR_READ_1(regsp, COM_REG_LCR);
735 CSR_WRITE_1(regsp, COM_REG_LCR,
736 lcr & ~LCR_DLAB);
737 CSR_WRITE_1(regsp, COM_REG_FIFO,
738 fcr | FIFO_64B_ENABLE);
739 iir1 = CSR_READ_1(regsp, COM_REG_IIR);
740 CSR_WRITE_1(regsp, COM_REG_FIFO, fcr);
741 CSR_WRITE_1(regsp, COM_REG_LCR, lcr | LCR_DLAB);
742 CSR_WRITE_1(regsp, COM_REG_FIFO,
743 fcr | FIFO_64B_ENABLE);
744 iir2 = CSR_READ_1(regsp, COM_REG_IIR);
745
746 CSR_WRITE_1(regsp, COM_REG_LCR, lcr);
747
748 if (!ISSET(iir1, IIR_64B_FIFO) &&
749 ISSET(iir2, IIR_64B_FIFO)) {
750 /* It is TL16C750. */
751 sc->sc_fifolen = 64;
752 SET(sc->sc_hwflags, COM_HW_AFE);
753 } else
754 CSR_WRITE_1(regsp, COM_REG_FIFO, fcr);
755
756 if (sc->sc_fifolen == 64)
757 fifo_msg = "tl16c750";
758 else
759 fifo_msg = "ns16750";
760 }
761 } else
762 fifo_msg = "ns16550, broken fifo";
763 else
764 fifo_msg = "ns8250 or ns16450, no fifo";
765 CSR_WRITE_1(regsp, COM_REG_FIFO, 0);
766
767 fifodelay:
768 /*
769 * Some chips will clear down both Tx and Rx FIFOs when zero is
770 * written to com_fifo. If this chip is the console, writing zero
771 * results in some of the chip/FIFO description being lost, so delay
772 * printing it until now.
773 */
774 delay(10);
775 if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
776 aprint_normal(": %s, %d-byte FIFO\n", fifo_msg, sc->sc_fifolen);
777 } else {
778 aprint_normal(": %s\n", fifo_msg);
779 }
780 if (ISSET(sc->sc_hwflags, COM_HW_TXFIFO_DISABLE)) {
781 sc->sc_fifolen = 1;
782 aprint_normal_dev(sc->sc_dev, "txfifo disabled\n");
783 }
784
785 fifodone:
786
787 tp = tty_alloc();
788 tp->t_oproc = comstart;
789 tp->t_param = comparam;
790 tp->t_hwiflow = comhwiflow;
791 tp->t_softc = sc;
792
793 sc->sc_tty = tp;
794 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_WAITOK);
795 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
796 sc->sc_rbavail = com_rbuf_size;
797 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1);
798
799 tty_attach(tp);
800
801 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN))
802 SET(sc->sc_mcr, MCR_IENABLE);
803
804 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
805 int maj;
806
807 /* locate the major number */
808 maj = cdevsw_lookup_major(&com_cdevsw);
809
810 tp->t_dev = cn_tab->cn_dev = makedev(maj,
811 device_unit(sc->sc_dev));
812
813 aprint_normal_dev(sc->sc_dev, "console\n");
814 }
815
816 #ifdef KGDB
817 /*
818 * Allow kgdb to "take over" this port. If this is
819 * not the console and is the kgdb device, it has
820 * exclusive use. If it's the console _and_ the
821 * kgdb device, it doesn't.
822 */
823 if (bus_space_is_equal(regsp->cr_iot, comkgdbregs.cr_iot) &&
824 regsp->cr_iobase == comkgdbregs.cr_iobase) {
825 if (!ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
826 com_kgdb_attached = 1;
827
828 SET(sc->sc_hwflags, COM_HW_KGDB);
829 }
830 aprint_normal_dev(sc->sc_dev, "kgdb\n");
831 }
832 #endif
833
834 sc->sc_si = softint_establish(SOFTINT_SERIAL, comsoft, sc);
835
836 #ifdef RND_COM
837 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
838 RND_TYPE_TTY, RND_FLAG_DEFAULT);
839 #endif
840
841 /* if there are no enable/disable functions, assume the device
842 is always enabled */
843 if (!sc->enable)
844 sc->enabled = 1;
845
846 com_config(sc);
847
848 SET(sc->sc_hwflags, COM_HW_DEV_OK);
849
850 if (sc->sc_poll_ticks != 0)
851 callout_schedule(&sc->sc_poll_callout, sc->sc_poll_ticks);
852 }
853
854 void
855 com_config(struct com_softc *sc)
856 {
857 struct com_regs *regsp = &sc->sc_regs;
858
859 /* Disable interrupts before configuring the device. */
860 if (sc->sc_type == COM_TYPE_PXA2x0)
861 sc->sc_ier = IER_EUART;
862 else
863 sc->sc_ier = 0;
864 CSR_WRITE_1(regsp, COM_REG_IER, sc->sc_ier);
865 (void) CSR_READ_1(regsp, COM_REG_IIR);
866
867 /* Look for a Hayes ESP board. */
868 if (sc->sc_type == COM_TYPE_HAYESP) {
869
870 /* Set 16550 compatibility mode */
871 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD1,
872 HAYESP_SETMODE);
873 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
874 HAYESP_MODE_FIFO|HAYESP_MODE_RTS|
875 HAYESP_MODE_SCALE);
876
877 /* Set RTS/CTS flow control */
878 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD1,
879 HAYESP_SETFLOWTYPE);
880 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
881 HAYESP_FLOW_RTS);
882 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
883 HAYESP_FLOW_CTS);
884
885 /* Set flow control levels */
886 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD1,
887 HAYESP_SETRXFLOW);
888 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
889 HAYESP_HIBYTE(HAYESP_RXHIWMARK));
890 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
891 HAYESP_LOBYTE(HAYESP_RXHIWMARK));
892 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
893 HAYESP_HIBYTE(HAYESP_RXLOWMARK));
894 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
895 HAYESP_LOBYTE(HAYESP_RXLOWMARK));
896 }
897
898 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE|COM_HW_KGDB))
899 com_enable_debugport(sc);
900 }
901
902 int
903 com_detach(device_t self, int flags)
904 {
905 struct com_softc *sc = device_private(self);
906 int maj, mn;
907
908 if (ISSET(sc->sc_hwflags, COM_HW_KGDB))
909 return EBUSY;
910
911 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE) &&
912 (flags & DETACH_SHUTDOWN) != 0)
913 return EBUSY;
914
915 if (sc->disable != NULL && sc->enabled != 0) {
916 (*sc->disable)(sc);
917 sc->enabled = 0;
918 }
919
920 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
921 comconsattached = 0;
922 cn_tab = NULL;
923 }
924
925 /* locate the major number */
926 maj = cdevsw_lookup_major(&com_cdevsw);
927
928 /* Nuke the vnodes for any open instances. */
929 mn = device_unit(self);
930 vdevgone(maj, mn, mn, VCHR);
931
932 mn |= COMDIALOUT_MASK;
933 vdevgone(maj, mn, mn, VCHR);
934
935 if (sc->sc_rbuf == NULL) {
936 /*
937 * Ring buffer allocation failed in the com_attach_subr,
938 * only the tty is allocated, and nothing else.
939 */
940 tty_free(sc->sc_tty);
941 return 0;
942 }
943
944 /* Free the receive buffer. */
945 free(sc->sc_rbuf, M_DEVBUF);
946
947 /* Detach and free the tty. */
948 tty_detach(sc->sc_tty);
949 tty_free(sc->sc_tty);
950
951 /* Unhook the soft interrupt handler. */
952 softint_disestablish(sc->sc_si);
953
954 #ifdef RND_COM
955 /* Unhook the entropy source. */
956 rnd_detach_source(&sc->rnd_source);
957 #endif
958 callout_destroy(&sc->sc_diag_callout);
959
960 /* Destroy the lock. */
961 mutex_destroy(&sc->sc_lock);
962
963 return (0);
964 }
965
966 void
967 com_shutdown(struct com_softc *sc)
968 {
969 struct tty *tp = sc->sc_tty;
970
971 mutex_spin_enter(&sc->sc_lock);
972
973 /* If we were asserting flow control, then deassert it. */
974 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED);
975 com_hwiflow(sc);
976
977 /* Clear any break condition set with TIOCSBRK. */
978 com_break(sc, 0);
979
980 /*
981 * Hang up if necessary. Record when we hung up, so if we
982 * immediately open the port again, we will wait a bit until
983 * the other side has had time to notice that we hung up.
984 */
985 if (ISSET(tp->t_cflag, HUPCL)) {
986 com_modem(sc, 0);
987 microuptime(&sc->sc_hup_pending);
988 sc->sc_hup_pending.tv_sec++;
989 }
990
991 /* Turn off interrupts. */
992 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
993 sc->sc_ier = IER_ERLS; /* interrupt on line break */
994 if ((sc->sc_type == COM_TYPE_PXA2x0) ||
995 (sc->sc_type == COM_TYPE_INGENIC) ||
996 (sc->sc_type == COM_TYPE_TEGRA))
997 sc->sc_ier |= IER_ERXTOUT;
998 } else
999 sc->sc_ier = 0;
1000
1001 if (sc->sc_type == COM_TYPE_PXA2x0)
1002 sc->sc_ier |= IER_EUART;
1003
1004 CSR_WRITE_1(&sc->sc_regs, COM_REG_IER, sc->sc_ier);
1005
1006 mutex_spin_exit(&sc->sc_lock);
1007
1008 if (sc->disable) {
1009 #ifdef DIAGNOSTIC
1010 if (!sc->enabled)
1011 panic("com_shutdown: not enabled?");
1012 #endif
1013 (*sc->disable)(sc);
1014 sc->enabled = 0;
1015 }
1016 }
1017
1018 int
1019 comopen(dev_t dev, int flag, int mode, struct lwp *l)
1020 {
1021 struct com_softc *sc;
1022 struct tty *tp;
1023 int s;
1024 int error;
1025
1026 sc = device_lookup_private(&com_cd, COMUNIT(dev));
1027 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK) ||
1028 sc->sc_rbuf == NULL)
1029 return (ENXIO);
1030
1031 if (!device_is_active(sc->sc_dev))
1032 return (ENXIO);
1033
1034 #ifdef KGDB
1035 /*
1036 * If this is the kgdb port, no other use is permitted.
1037 */
1038 if (ISSET(sc->sc_hwflags, COM_HW_KGDB))
1039 return (EBUSY);
1040 #endif
1041
1042 tp = sc->sc_tty;
1043
1044 /*
1045 * If the device is exclusively for kernel use, deny userland
1046 * open.
1047 */
1048 if (ISSET(tp->t_state, TS_KERN_ONLY))
1049 return (EBUSY);
1050
1051 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
1052 return (EBUSY);
1053
1054 s = spltty();
1055
1056 /*
1057 * Do the following iff this is a first open.
1058 */
1059 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
1060 struct termios t;
1061 struct timeval now, diff;
1062
1063 tp->t_dev = dev;
1064
1065 if (sc->enable) {
1066 if ((*sc->enable)(sc)) {
1067 splx(s);
1068 aprint_error_dev(sc->sc_dev,
1069 "device enable failed\n");
1070 return (EIO);
1071 }
1072 mutex_spin_enter(&sc->sc_lock);
1073 sc->enabled = 1;
1074 com_config(sc);
1075 } else {
1076 mutex_spin_enter(&sc->sc_lock);
1077 }
1078
1079 if (timerisset(&sc->sc_hup_pending)) {
1080 microuptime(&now);
1081 while (timercmp(&now, &sc->sc_hup_pending, <)) {
1082 timersub(&sc->sc_hup_pending, &now, &diff);
1083 const int ms = diff.tv_sec * 1000 +
1084 diff.tv_usec / 1000;
1085 kpause(ttclos, false, uimax(mstohz(ms), 1),
1086 &sc->sc_lock);
1087 microuptime(&now);
1088 }
1089 timerclear(&sc->sc_hup_pending);
1090 }
1091
1092 /* Turn on interrupts. */
1093 sc->sc_ier = IER_ERXRDY | IER_ERLS;
1094 if (!ISSET(tp->t_cflag, CLOCAL))
1095 sc->sc_ier |= IER_EMSC;
1096
1097 if (sc->sc_type == COM_TYPE_PXA2x0)
1098 sc->sc_ier |= IER_EUART | IER_ERXTOUT;
1099 else if (sc->sc_type == COM_TYPE_INGENIC ||
1100 sc->sc_type == COM_TYPE_TEGRA)
1101 sc->sc_ier |= IER_ERXTOUT;
1102 CSR_WRITE_1(&sc->sc_regs, COM_REG_IER, sc->sc_ier);
1103
1104 /* Fetch the current modem control status, needed later. */
1105 sc->sc_msr = CSR_READ_1(&sc->sc_regs, COM_REG_MSR);
1106
1107 /* Clear PPS capture state on first open. */
1108 mutex_spin_enter(&timecounter_lock);
1109 memset(&sc->sc_pps_state, 0, sizeof(sc->sc_pps_state));
1110 sc->sc_pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
1111 pps_init(&sc->sc_pps_state);
1112 mutex_spin_exit(&timecounter_lock);
1113
1114 mutex_spin_exit(&sc->sc_lock);
1115
1116 /*
1117 * Initialize the termios status to the defaults. Add in the
1118 * sticky bits from TIOCSFLAGS.
1119 */
1120 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
1121 t.c_ospeed = comcons_info.rate;
1122 t.c_cflag = comcons_info.cflag;
1123 } else {
1124 t.c_ospeed = TTYDEF_SPEED;
1125 t.c_cflag = TTYDEF_CFLAG;
1126 }
1127 t.c_ispeed = t.c_ospeed;
1128 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL))
1129 SET(t.c_cflag, CLOCAL);
1130 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS))
1131 SET(t.c_cflag, CRTSCTS);
1132 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF))
1133 SET(t.c_cflag, MDMBUF);
1134 /* Make sure comparam() will do something. */
1135 tp->t_ospeed = 0;
1136 (void) comparam(tp, &t);
1137 tp->t_iflag = TTYDEF_IFLAG;
1138 tp->t_oflag = TTYDEF_OFLAG;
1139 tp->t_lflag = TTYDEF_LFLAG;
1140 ttychars(tp);
1141 ttsetwater(tp);
1142
1143 mutex_spin_enter(&sc->sc_lock);
1144
1145 /*
1146 * Turn on DTR. We must always do this, even if carrier is not
1147 * present, because otherwise we'd have to use TIOCSDTR
1148 * immediately after setting CLOCAL, which applications do not
1149 * expect. We always assert DTR while the device is open
1150 * unless explicitly requested to deassert it.
1151 */
1152 com_modem(sc, 1);
1153
1154 /* Clear the input ring, and unblock. */
1155 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
1156 sc->sc_rbavail = com_rbuf_size;
1157 com_iflush(sc);
1158 CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
1159 com_hwiflow(sc);
1160
1161 #ifdef COM_DEBUG
1162 if (com_debug)
1163 comstatus(sc, "comopen ");
1164 #endif
1165
1166 mutex_spin_exit(&sc->sc_lock);
1167 }
1168
1169 splx(s);
1170
1171 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK));
1172 if (error)
1173 goto bad;
1174
1175 error = (*tp->t_linesw->l_open)(dev, tp);
1176 if (error)
1177 goto bad;
1178
1179 return (0);
1180
1181 bad:
1182 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
1183 /*
1184 * We failed to open the device, and nobody else had it opened.
1185 * Clean up the state as appropriate.
1186 */
1187 com_shutdown(sc);
1188 }
1189
1190 return (error);
1191 }
1192
1193 int
1194 comclose(dev_t dev, int flag, int mode, struct lwp *l)
1195 {
1196 struct com_softc *sc =
1197 device_lookup_private(&com_cd, COMUNIT(dev));
1198 struct tty *tp = sc->sc_tty;
1199
1200 /* XXX This is for cons.c. */
1201 if (!ISSET(tp->t_state, TS_ISOPEN))
1202 return (0);
1203 /*
1204 * If the device is exclusively for kernel use, deny userland
1205 * close.
1206 */
1207 if (ISSET(tp->t_state, TS_KERN_ONLY))
1208 return (0);
1209
1210 (*tp->t_linesw->l_close)(tp, flag);
1211 ttyclose(tp);
1212
1213 if (COM_ISALIVE(sc) == 0)
1214 return (0);
1215
1216 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
1217 /*
1218 * Although we got a last close, the device may still be in
1219 * use; e.g. if this was the dialout node, and there are still
1220 * processes waiting for carrier on the non-dialout node.
1221 */
1222 com_shutdown(sc);
1223 }
1224
1225 return (0);
1226 }
1227
1228 int
1229 comread(dev_t dev, struct uio *uio, int flag)
1230 {
1231 struct com_softc *sc =
1232 device_lookup_private(&com_cd, COMUNIT(dev));
1233 struct tty *tp = sc->sc_tty;
1234
1235 if (COM_ISALIVE(sc) == 0)
1236 return (EIO);
1237
1238 return ((*tp->t_linesw->l_read)(tp, uio, flag));
1239 }
1240
1241 int
1242 comwrite(dev_t dev, struct uio *uio, int flag)
1243 {
1244 struct com_softc *sc =
1245 device_lookup_private(&com_cd, COMUNIT(dev));
1246 struct tty *tp = sc->sc_tty;
1247
1248 if (COM_ISALIVE(sc) == 0)
1249 return (EIO);
1250
1251 return ((*tp->t_linesw->l_write)(tp, uio, flag));
1252 }
1253
1254 int
1255 compoll(dev_t dev, int events, struct lwp *l)
1256 {
1257 struct com_softc *sc =
1258 device_lookup_private(&com_cd, COMUNIT(dev));
1259 struct tty *tp = sc->sc_tty;
1260
1261 if (COM_ISALIVE(sc) == 0)
1262 return (POLLHUP);
1263
1264 return ((*tp->t_linesw->l_poll)(tp, events, l));
1265 }
1266
1267 struct tty *
1268 comtty(dev_t dev)
1269 {
1270 struct com_softc *sc =
1271 device_lookup_private(&com_cd, COMUNIT(dev));
1272 struct tty *tp = sc->sc_tty;
1273
1274 return (tp);
1275 }
1276
1277 int
1278 comioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
1279 {
1280 struct com_softc *sc;
1281 struct tty *tp;
1282 int error;
1283
1284 sc = device_lookup_private(&com_cd, COMUNIT(dev));
1285 if (sc == NULL)
1286 return ENXIO;
1287 if (COM_ISALIVE(sc) == 0)
1288 return (EIO);
1289
1290 tp = sc->sc_tty;
1291
1292 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
1293 if (error != EPASSTHROUGH)
1294 return (error);
1295
1296 error = ttioctl(tp, cmd, data, flag, l);
1297 if (error != EPASSTHROUGH)
1298 return (error);
1299
1300 error = 0;
1301 switch (cmd) {
1302 case TIOCSFLAGS:
1303 error = kauth_authorize_device_tty(l->l_cred,
1304 KAUTH_DEVICE_TTY_PRIVSET, tp);
1305 break;
1306 default:
1307 /* nothing */
1308 break;
1309 }
1310 if (error) {
1311 return error;
1312 }
1313
1314 mutex_spin_enter(&sc->sc_lock);
1315
1316 switch (cmd) {
1317 case TIOCSBRK:
1318 com_break(sc, 1);
1319 break;
1320
1321 case TIOCCBRK:
1322 com_break(sc, 0);
1323 break;
1324
1325 case TIOCSDTR:
1326 com_modem(sc, 1);
1327 break;
1328
1329 case TIOCCDTR:
1330 com_modem(sc, 0);
1331 break;
1332
1333 case TIOCGFLAGS:
1334 *(int *)data = sc->sc_swflags;
1335 break;
1336
1337 case TIOCSFLAGS:
1338 sc->sc_swflags = *(int *)data;
1339 break;
1340
1341 case TIOCMSET:
1342 case TIOCMBIS:
1343 case TIOCMBIC:
1344 tiocm_to_com(sc, cmd, *(int *)data);
1345 break;
1346
1347 case TIOCMGET:
1348 *(int *)data = com_to_tiocm(sc);
1349 break;
1350
1351 case PPS_IOC_CREATE:
1352 case PPS_IOC_DESTROY:
1353 case PPS_IOC_GETPARAMS:
1354 case PPS_IOC_SETPARAMS:
1355 case PPS_IOC_GETCAP:
1356 case PPS_IOC_FETCH:
1357 #ifdef PPS_SYNC
1358 case PPS_IOC_KCBIND:
1359 #endif
1360 mutex_spin_enter(&timecounter_lock);
1361 error = pps_ioctl(cmd, data, &sc->sc_pps_state);
1362 mutex_spin_exit(&timecounter_lock);
1363 break;
1364
1365 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */
1366 mutex_spin_enter(&timecounter_lock);
1367 #ifndef PPS_TRAILING_EDGE
1368 TIMESPEC_TO_TIMEVAL((struct timeval *)data,
1369 &sc->sc_pps_state.ppsinfo.assert_timestamp);
1370 #else
1371 TIMESPEC_TO_TIMEVAL((struct timeval *)data,
1372 &sc->sc_pps_state.ppsinfo.clear_timestamp);
1373 #endif
1374 mutex_spin_exit(&timecounter_lock);
1375 break;
1376
1377 default:
1378 error = EPASSTHROUGH;
1379 break;
1380 }
1381
1382 mutex_spin_exit(&sc->sc_lock);
1383
1384 #ifdef COM_DEBUG
1385 if (com_debug)
1386 comstatus(sc, "comioctl ");
1387 #endif
1388
1389 return (error);
1390 }
1391
1392 static inline void
1393 com_schedrx(struct com_softc *sc)
1394 {
1395
1396 sc->sc_rx_ready = 1;
1397
1398 /* Wake up the poller. */
1399 softint_schedule(sc->sc_si);
1400 }
1401
1402 void
1403 com_break(struct com_softc *sc, int onoff)
1404 {
1405
1406 if (onoff)
1407 SET(sc->sc_lcr, LCR_SBREAK);
1408 else
1409 CLR(sc->sc_lcr, LCR_SBREAK);
1410
1411 if (!sc->sc_heldchange) {
1412 if (sc->sc_tx_busy) {
1413 sc->sc_heldtbc = sc->sc_tbc;
1414 sc->sc_tbc = 0;
1415 sc->sc_heldchange = 1;
1416 } else
1417 com_loadchannelregs(sc);
1418 }
1419 }
1420
1421 void
1422 com_modem(struct com_softc *sc, int onoff)
1423 {
1424
1425 if (sc->sc_mcr_dtr == 0)
1426 return;
1427
1428 if (onoff)
1429 SET(sc->sc_mcr, sc->sc_mcr_dtr);
1430 else
1431 CLR(sc->sc_mcr, sc->sc_mcr_dtr);
1432
1433 if (!sc->sc_heldchange) {
1434 if (sc->sc_tx_busy) {
1435 sc->sc_heldtbc = sc->sc_tbc;
1436 sc->sc_tbc = 0;
1437 sc->sc_heldchange = 1;
1438 } else
1439 com_loadchannelregs(sc);
1440 }
1441 }
1442
1443 void
1444 tiocm_to_com(struct com_softc *sc, u_long how, int ttybits)
1445 {
1446 u_char combits;
1447
1448 combits = 0;
1449 if (ISSET(ttybits, TIOCM_DTR))
1450 SET(combits, MCR_DTR);
1451 if (ISSET(ttybits, TIOCM_RTS))
1452 SET(combits, MCR_RTS);
1453
1454 switch (how) {
1455 case TIOCMBIC:
1456 CLR(sc->sc_mcr, combits);
1457 break;
1458
1459 case TIOCMBIS:
1460 SET(sc->sc_mcr, combits);
1461 break;
1462
1463 case TIOCMSET:
1464 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS);
1465 SET(sc->sc_mcr, combits);
1466 break;
1467 }
1468
1469 if (!sc->sc_heldchange) {
1470 if (sc->sc_tx_busy) {
1471 sc->sc_heldtbc = sc->sc_tbc;
1472 sc->sc_tbc = 0;
1473 sc->sc_heldchange = 1;
1474 } else
1475 com_loadchannelregs(sc);
1476 }
1477 }
1478
1479 int
1480 com_to_tiocm(struct com_softc *sc)
1481 {
1482 u_char combits;
1483 int ttybits = 0;
1484
1485 combits = sc->sc_mcr;
1486 if (ISSET(combits, MCR_DTR))
1487 SET(ttybits, TIOCM_DTR);
1488 if (ISSET(combits, MCR_RTS))
1489 SET(ttybits, TIOCM_RTS);
1490
1491 combits = sc->sc_msr;
1492 if (sc->sc_type == COM_TYPE_INGENIC) {
1493 SET(ttybits, TIOCM_CD);
1494 } else {
1495 if (ISSET(combits, MSR_DCD))
1496 SET(ttybits, TIOCM_CD);
1497 }
1498 if (ISSET(combits, MSR_CTS))
1499 SET(ttybits, TIOCM_CTS);
1500 if (ISSET(combits, MSR_DSR))
1501 SET(ttybits, TIOCM_DSR);
1502 if (ISSET(combits, MSR_RI | MSR_TERI))
1503 SET(ttybits, TIOCM_RI);
1504
1505 if (ISSET(sc->sc_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC))
1506 SET(ttybits, TIOCM_LE);
1507
1508 return (ttybits);
1509 }
1510
1511 static u_char
1512 cflag2lcr(tcflag_t cflag)
1513 {
1514 u_char lcr = 0;
1515
1516 switch (ISSET(cflag, CSIZE)) {
1517 case CS5:
1518 SET(lcr, LCR_5BITS);
1519 break;
1520 case CS6:
1521 SET(lcr, LCR_6BITS);
1522 break;
1523 case CS7:
1524 SET(lcr, LCR_7BITS);
1525 break;
1526 case CS8:
1527 SET(lcr, LCR_8BITS);
1528 break;
1529 }
1530 if (ISSET(cflag, PARENB)) {
1531 SET(lcr, LCR_PENAB);
1532 if (!ISSET(cflag, PARODD))
1533 SET(lcr, LCR_PEVEN);
1534 }
1535 if (ISSET(cflag, CSTOPB))
1536 SET(lcr, LCR_STOPB);
1537
1538 return (lcr);
1539 }
1540
1541 int
1542 comparam(struct tty *tp, struct termios *t)
1543 {
1544 struct com_softc *sc =
1545 device_lookup_private(&com_cd, COMUNIT(tp->t_dev));
1546 int ospeed;
1547 u_char lcr;
1548
1549 if (COM_ISALIVE(sc) == 0)
1550 return (EIO);
1551
1552 if (sc->sc_type == COM_TYPE_HAYESP) {
1553 int prescaler, speed;
1554
1555 /*
1556 * Calculate UART clock prescaler. It should be in
1557 * range of 0 .. 3.
1558 */
1559 for (prescaler = 0, speed = t->c_ospeed; prescaler < 4;
1560 prescaler++, speed /= 2)
1561 if ((ospeed = comspeed(speed, sc->sc_frequency,
1562 sc->sc_type)) > 0)
1563 break;
1564
1565 if (prescaler == 4)
1566 return (EINVAL);
1567 sc->sc_prescaler = prescaler;
1568 } else
1569 ospeed = comspeed(t->c_ospeed, sc->sc_frequency, sc->sc_type);
1570
1571 /* Check requested parameters. */
1572 if (ospeed < 0)
1573 return (EINVAL);
1574 if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
1575 return (EINVAL);
1576
1577 /*
1578 * For the console, always force CLOCAL and !HUPCL, so that the port
1579 * is always active.
1580 */
1581 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
1582 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
1583 SET(t->c_cflag, CLOCAL);
1584 CLR(t->c_cflag, HUPCL);
1585 }
1586
1587 /*
1588 * If there were no changes, don't do anything. This avoids dropping
1589 * input and improves performance when all we did was frob things like
1590 * VMIN and VTIME.
1591 */
1592 if (tp->t_ospeed == t->c_ospeed &&
1593 tp->t_cflag == t->c_cflag)
1594 return (0);
1595
1596 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag);
1597
1598 mutex_spin_enter(&sc->sc_lock);
1599
1600 sc->sc_lcr = lcr;
1601
1602 /*
1603 * If we're not in a mode that assumes a connection is present, then
1604 * ignore carrier changes.
1605 */
1606 if (ISSET(t->c_cflag, CLOCAL | MDMBUF))
1607 sc->sc_msr_dcd = 0;
1608 else
1609 sc->sc_msr_dcd = MSR_DCD;
1610 /*
1611 * Set the flow control pins depending on the current flow control
1612 * mode.
1613 */
1614 if (ISSET(t->c_cflag, CRTSCTS)) {
1615 sc->sc_mcr_dtr = MCR_DTR;
1616 sc->sc_mcr_rts = MCR_RTS;
1617 sc->sc_msr_cts = MSR_CTS;
1618 if (ISSET(sc->sc_hwflags, COM_HW_AFE)) {
1619 SET(sc->sc_mcr, MCR_AFE);
1620 } else {
1621 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS;
1622 }
1623 } else if (ISSET(t->c_cflag, MDMBUF)) {
1624 /*
1625 * For DTR/DCD flow control, make sure we don't toggle DTR for
1626 * carrier detection.
1627 */
1628 sc->sc_mcr_dtr = 0;
1629 sc->sc_mcr_rts = MCR_DTR;
1630 sc->sc_msr_cts = MSR_DCD;
1631 if (ISSET(sc->sc_hwflags, COM_HW_AFE)) {
1632 CLR(sc->sc_mcr, MCR_AFE);
1633 } else {
1634 sc->sc_efr = 0;
1635 }
1636 } else {
1637 /*
1638 * If no flow control, then always set RTS. This will make
1639 * the other side happy if it mistakenly thinks we're doing
1640 * RTS/CTS flow control.
1641 */
1642 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS;
1643 sc->sc_mcr_rts = 0;
1644 sc->sc_msr_cts = 0;
1645 if (ISSET(sc->sc_hwflags, COM_HW_AFE)) {
1646 CLR(sc->sc_mcr, MCR_AFE);
1647 } else {
1648 sc->sc_efr = 0;
1649 }
1650 if (ISSET(sc->sc_mcr, MCR_DTR))
1651 SET(sc->sc_mcr, MCR_RTS);
1652 else
1653 CLR(sc->sc_mcr, MCR_RTS);
1654 }
1655 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
1656
1657 if (t->c_ospeed == 0 && tp->t_ospeed != 0)
1658 CLR(sc->sc_mcr, sc->sc_mcr_dtr);
1659 else if (t->c_ospeed != 0 && tp->t_ospeed == 0)
1660 SET(sc->sc_mcr, sc->sc_mcr_dtr);
1661
1662 sc->sc_dlbl = ospeed;
1663 sc->sc_dlbh = ospeed >> 8;
1664
1665 /*
1666 * Set the FIFO threshold based on the receive speed.
1667 *
1668 * * If it's a low speed, it's probably a mouse or some other
1669 * interactive device, so set the threshold low.
1670 * * If it's a high speed, trim the trigger level down to prevent
1671 * overflows.
1672 * * Otherwise set it a bit higher.
1673 */
1674 if (sc->sc_type == COM_TYPE_HAYESP) {
1675 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8;
1676 } else if (sc->sc_type == COM_TYPE_TEGRA) {
1677 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_1;
1678 } else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) {
1679 if (t->c_ospeed <= 1200)
1680 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_1;
1681 else if (t->c_ospeed <= 38400)
1682 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_8;
1683 else
1684 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_4;
1685 } else {
1686 sc->sc_fifo = 0;
1687 }
1688
1689 if (sc->sc_type == COM_TYPE_INGENIC)
1690 sc->sc_fifo |= FIFO_UART_ON;
1691
1692 /* And copy to tty. */
1693 tp->t_ispeed = t->c_ospeed;
1694 tp->t_ospeed = t->c_ospeed;
1695 tp->t_cflag = t->c_cflag;
1696
1697 if (!sc->sc_heldchange) {
1698 if (sc->sc_tx_busy) {
1699 sc->sc_heldtbc = sc->sc_tbc;
1700 sc->sc_tbc = 0;
1701 sc->sc_heldchange = 1;
1702 } else
1703 com_loadchannelregs(sc);
1704 }
1705
1706 if (!ISSET(t->c_cflag, CHWFLOW)) {
1707 /* Disable the high water mark. */
1708 sc->sc_r_hiwat = 0;
1709 sc->sc_r_lowat = 0;
1710 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
1711 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
1712 com_schedrx(sc);
1713 }
1714 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
1715 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
1716 com_hwiflow(sc);
1717 }
1718 } else {
1719 sc->sc_r_hiwat = com_rbuf_hiwat;
1720 sc->sc_r_lowat = com_rbuf_lowat;
1721 }
1722
1723 mutex_spin_exit(&sc->sc_lock);
1724
1725 /*
1726 * Update the tty layer's idea of the carrier bit, in case we changed
1727 * CLOCAL or MDMBUF. We don't hang up here; we only do that by
1728 * explicit request.
1729 */
1730 if (sc->sc_type == COM_TYPE_INGENIC) {
1731 /* no DCD here */
1732 (void) (*tp->t_linesw->l_modem)(tp, 1);
1733 } else
1734 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD));
1735
1736 #ifdef COM_DEBUG
1737 if (com_debug)
1738 comstatus(sc, "comparam ");
1739 #endif
1740
1741 if (!ISSET(t->c_cflag, CHWFLOW)) {
1742 if (sc->sc_tx_stopped) {
1743 sc->sc_tx_stopped = 0;
1744 comstart(tp);
1745 }
1746 }
1747
1748 return (0);
1749 }
1750
1751 void
1752 com_iflush(struct com_softc *sc)
1753 {
1754 struct com_regs *regsp = &sc->sc_regs;
1755 uint8_t fifo;
1756 #ifdef DIAGNOSTIC
1757 int reg;
1758 #endif
1759 int timo;
1760
1761 #ifdef DIAGNOSTIC
1762 reg = 0xffff;
1763 #endif
1764 timo = 50000;
1765 /* flush any pending I/O */
1766 while (ISSET(CSR_READ_1(regsp, COM_REG_LSR), LSR_RXRDY)
1767 && --timo)
1768 #ifdef DIAGNOSTIC
1769 reg =
1770 #else
1771 (void)
1772 #endif
1773 CSR_READ_1(regsp, COM_REG_RXDATA);
1774 #ifdef DIAGNOSTIC
1775 if (!timo)
1776 aprint_error_dev(sc->sc_dev, "com_iflush timeout %02x\n", reg);
1777 #endif
1778
1779 switch (sc->sc_type) {
1780 case COM_TYPE_16750:
1781 case COM_TYPE_DW_APB:
1782 /*
1783 * Reset all Rx/Tx FIFO, preserve current FIFO length.
1784 * This should prevent triggering busy interrupt while
1785 * manipulating divisors.
1786 */
1787 fifo = CSR_READ_1(regsp, COM_REG_FIFO) & (FIFO_TRIGGER_1 |
1788 FIFO_TRIGGER_4 | FIFO_TRIGGER_8 | FIFO_TRIGGER_14);
1789 CSR_WRITE_1(regsp, COM_REG_FIFO,
1790 fifo | FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST);
1791 delay(100);
1792 break;
1793 }
1794 }
1795
1796 void
1797 com_loadchannelregs(struct com_softc *sc)
1798 {
1799 struct com_regs *regsp = &sc->sc_regs;
1800
1801 /* XXXXX necessary? */
1802 com_iflush(sc);
1803
1804 if (sc->sc_type == COM_TYPE_PXA2x0)
1805 CSR_WRITE_1(regsp, COM_REG_IER, IER_EUART);
1806 else
1807 CSR_WRITE_1(regsp, COM_REG_IER, 0);
1808
1809 if (sc->sc_type == COM_TYPE_OMAP) {
1810 /* disable before changing settings */
1811 CSR_WRITE_1(regsp, COM_REG_MDR1, MDR1_MODE_DISABLE);
1812 }
1813
1814 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) {
1815 KASSERT(sc->sc_type != COM_TYPE_AU1x00);
1816 KASSERT(sc->sc_type != COM_TYPE_16550_NOERS);
1817 /* no EFR on alchemy */
1818 CSR_WRITE_1(regsp, COM_REG_LCR, LCR_EERS);
1819 CSR_WRITE_1(regsp, COM_REG_EFR, sc->sc_efr);
1820 }
1821 if (sc->sc_type == COM_TYPE_AU1x00) {
1822 /* alchemy has single separate 16-bit clock divisor register */
1823 CSR_WRITE_2(regsp, COM_REG_DLBL, sc->sc_dlbl +
1824 (sc->sc_dlbh << 8));
1825 } else {
1826 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr | LCR_DLAB);
1827 CSR_WRITE_1(regsp, COM_REG_DLBL, sc->sc_dlbl);
1828 CSR_WRITE_1(regsp, COM_REG_DLBH, sc->sc_dlbh);
1829 }
1830 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr);
1831 CSR_WRITE_1(regsp, COM_REG_MCR, sc->sc_mcr_active = sc->sc_mcr);
1832 CSR_WRITE_1(regsp, COM_REG_FIFO, sc->sc_fifo);
1833 if (sc->sc_type == COM_TYPE_HAYESP) {
1834 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD1,
1835 HAYESP_SETPRESCALER);
1836 bus_space_write_1(regsp->cr_iot, sc->sc_hayespioh, HAYESP_CMD2,
1837 sc->sc_prescaler);
1838 }
1839 if (sc->sc_type == COM_TYPE_OMAP) {
1840 /* setup the fifos. the FCR value is not used as long
1841 as SCR[6] and SCR[7] are 0, which they are at reset
1842 and we never touch the SCR register */
1843 uint8_t rx_fifo_trig = 40;
1844 uint8_t tx_fifo_trig = 60;
1845 uint8_t rx_start = 8;
1846 uint8_t rx_halt = 60;
1847 uint8_t tlr_value = ((rx_fifo_trig>>2) << 4) | (tx_fifo_trig>>2);
1848 uint8_t tcr_value = ((rx_start>>2) << 4) | (rx_halt>>2);
1849
1850 /* enable access to TCR & TLR */
1851 CSR_WRITE_1(regsp, COM_REG_MCR, sc->sc_mcr | MCR_TCR_TLR);
1852
1853 /* write tcr and tlr values */
1854 CSR_WRITE_1(regsp, COM_REG_TLR, tlr_value);
1855 CSR_WRITE_1(regsp, COM_REG_TCR, tcr_value);
1856
1857 /* disable access to TCR & TLR */
1858 CSR_WRITE_1(regsp, COM_REG_MCR, sc->sc_mcr);
1859
1860 /* enable again, but mode is based on speed */
1861 if (sc->sc_tty->t_termios.c_ospeed > 230400) {
1862 CSR_WRITE_1(regsp, COM_REG_MDR1, MDR1_MODE_UART_13X);
1863 } else {
1864 CSR_WRITE_1(regsp, COM_REG_MDR1, MDR1_MODE_UART_16X);
1865 }
1866 }
1867
1868 CSR_WRITE_1(regsp, COM_REG_IER, sc->sc_ier);
1869 }
1870
1871 int
1872 comhwiflow(struct tty *tp, int block)
1873 {
1874 struct com_softc *sc =
1875 device_lookup_private(&com_cd, COMUNIT(tp->t_dev));
1876
1877 if (COM_ISALIVE(sc) == 0)
1878 return (0);
1879
1880 if (sc->sc_mcr_rts == 0)
1881 return (0);
1882
1883 mutex_spin_enter(&sc->sc_lock);
1884
1885 if (block) {
1886 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
1887 SET(sc->sc_rx_flags, RX_TTY_BLOCKED);
1888 com_hwiflow(sc);
1889 }
1890 } else {
1891 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
1892 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
1893 com_schedrx(sc);
1894 }
1895 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
1896 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED);
1897 com_hwiflow(sc);
1898 }
1899 }
1900
1901 mutex_spin_exit(&sc->sc_lock);
1902 return (1);
1903 }
1904
1905 /*
1906 * (un)block input via hw flowcontrol
1907 */
1908 void
1909 com_hwiflow(struct com_softc *sc)
1910 {
1911 struct com_regs *regsp= &sc->sc_regs;
1912
1913 if (sc->sc_mcr_rts == 0)
1914 return;
1915
1916 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) {
1917 CLR(sc->sc_mcr, sc->sc_mcr_rts);
1918 CLR(sc->sc_mcr_active, sc->sc_mcr_rts);
1919 } else {
1920 SET(sc->sc_mcr, sc->sc_mcr_rts);
1921 SET(sc->sc_mcr_active, sc->sc_mcr_rts);
1922 }
1923 CSR_WRITE_1(regsp, COM_REG_MCR, sc->sc_mcr_active);
1924 }
1925
1926
1927 void
1928 comstart(struct tty *tp)
1929 {
1930 struct com_softc *sc =
1931 device_lookup_private(&com_cd, COMUNIT(tp->t_dev));
1932 struct com_regs *regsp = &sc->sc_regs;
1933
1934 if (COM_ISALIVE(sc) == 0)
1935 return;
1936
1937 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
1938 return;
1939 if (sc->sc_tx_stopped)
1940 return;
1941 if (!ttypull(tp))
1942 return;
1943
1944 /* Grab the first contiguous region of buffer space. */
1945 {
1946 u_char *tba;
1947 int tbc;
1948
1949 tba = tp->t_outq.c_cf;
1950 tbc = ndqb(&tp->t_outq, 0);
1951
1952 mutex_spin_enter(&sc->sc_lock);
1953
1954 sc->sc_tba = tba;
1955 sc->sc_tbc = tbc;
1956 }
1957
1958 SET(tp->t_state, TS_BUSY);
1959 sc->sc_tx_busy = 1;
1960
1961 /* Enable transmit completion interrupts if necessary. */
1962 if (!ISSET(sc->sc_ier, IER_ETXRDY)) {
1963 SET(sc->sc_ier, IER_ETXRDY);
1964 CSR_WRITE_1(regsp, COM_REG_IER, sc->sc_ier);
1965 }
1966
1967 /* Output the first chunk of the contiguous buffer. */
1968 if (!ISSET(sc->sc_hwflags, COM_HW_NO_TXPRELOAD)) {
1969 u_int n;
1970
1971 n = sc->sc_tbc;
1972 if (n > sc->sc_fifolen)
1973 n = sc->sc_fifolen;
1974 CSR_WRITE_MULTI(regsp, COM_REG_TXDATA, sc->sc_tba, n);
1975 sc->sc_tbc -= n;
1976 sc->sc_tba += n;
1977 }
1978
1979 mutex_spin_exit(&sc->sc_lock);
1980 }
1981
1982 /*
1983 * Stop output on a line.
1984 */
1985 void
1986 comstop(struct tty *tp, int flag)
1987 {
1988 struct com_softc *sc =
1989 device_lookup_private(&com_cd, COMUNIT(tp->t_dev));
1990
1991 mutex_spin_enter(&sc->sc_lock);
1992 if (ISSET(tp->t_state, TS_BUSY)) {
1993 /* Stop transmitting at the next chunk. */
1994 sc->sc_tbc = 0;
1995 sc->sc_heldtbc = 0;
1996 if (!ISSET(tp->t_state, TS_TTSTOP))
1997 SET(tp->t_state, TS_FLUSH);
1998 }
1999 mutex_spin_exit(&sc->sc_lock);
2000 }
2001
2002 void
2003 comdiag(void *arg)
2004 {
2005 struct com_softc *sc = arg;
2006 int overflows, floods;
2007
2008 mutex_spin_enter(&sc->sc_lock);
2009 overflows = sc->sc_overflows;
2010 sc->sc_overflows = 0;
2011 floods = sc->sc_floods;
2012 sc->sc_floods = 0;
2013 sc->sc_errors = 0;
2014 mutex_spin_exit(&sc->sc_lock);
2015
2016 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
2017 device_xname(sc->sc_dev),
2018 overflows, overflows == 1 ? "" : "s",
2019 floods, floods == 1 ? "" : "s");
2020 }
2021
2022 static inline void
2023 com_rxsoft(struct com_softc *sc, struct tty *tp)
2024 {
2025 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint;
2026 u_char *get, *end;
2027 u_int cc, scc;
2028 u_char lsr;
2029 int code;
2030
2031 end = sc->sc_ebuf;
2032 get = sc->sc_rbget;
2033 scc = cc = com_rbuf_size - sc->sc_rbavail;
2034
2035 if (cc == com_rbuf_size) {
2036 sc->sc_floods++;
2037 if (sc->sc_errors++ == 0)
2038 callout_reset(&sc->sc_diag_callout, 60 * hz,
2039 comdiag, sc);
2040 }
2041
2042 /* If not yet open, drop the entire buffer content here */
2043 if (!ISSET(tp->t_state, TS_ISOPEN)) {
2044 get += cc << 1;
2045 if (get >= end)
2046 get -= com_rbuf_size << 1;
2047 cc = 0;
2048 }
2049 while (cc) {
2050 code = get[0];
2051 lsr = get[1];
2052 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) {
2053 if (ISSET(lsr, LSR_OE)) {
2054 sc->sc_overflows++;
2055 if (sc->sc_errors++ == 0)
2056 callout_reset(&sc->sc_diag_callout,
2057 60 * hz, comdiag, sc);
2058 }
2059 if (ISSET(lsr, LSR_BI | LSR_FE))
2060 SET(code, TTY_FE);
2061 if (ISSET(lsr, LSR_PE))
2062 SET(code, TTY_PE);
2063 }
2064 if ((*rint)(code, tp) == -1) {
2065 /*
2066 * The line discipline's buffer is out of space.
2067 */
2068 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
2069 /*
2070 * We're either not using flow control, or the
2071 * line discipline didn't tell us to block for
2072 * some reason. Either way, we have no way to
2073 * know when there's more space available, so
2074 * just drop the rest of the data.
2075 */
2076 get += cc << 1;
2077 if (get >= end)
2078 get -= com_rbuf_size << 1;
2079 cc = 0;
2080 } else {
2081 /*
2082 * Don't schedule any more receive processing
2083 * until the line discipline tells us there's
2084 * space available (through comhwiflow()).
2085 * Leave the rest of the data in the input
2086 * buffer.
2087 */
2088 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
2089 }
2090 break;
2091 }
2092 get += 2;
2093 if (get >= end)
2094 get = sc->sc_rbuf;
2095 cc--;
2096 }
2097
2098 if (cc != scc) {
2099 sc->sc_rbget = get;
2100 mutex_spin_enter(&sc->sc_lock);
2101
2102 cc = sc->sc_rbavail += scc - cc;
2103 /* Buffers should be ok again, release possible block. */
2104 if (cc >= sc->sc_r_lowat) {
2105 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
2106 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
2107 SET(sc->sc_ier, IER_ERXRDY);
2108 if (sc->sc_type == COM_TYPE_PXA2x0)
2109 SET(sc->sc_ier, IER_ERXTOUT);
2110 if (sc->sc_type == COM_TYPE_INGENIC ||
2111 sc->sc_type == COM_TYPE_TEGRA)
2112 SET(sc->sc_ier, IER_ERXTOUT);
2113
2114 CSR_WRITE_1(&sc->sc_regs, COM_REG_IER,
2115 sc->sc_ier);
2116 }
2117 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
2118 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
2119 com_hwiflow(sc);
2120 }
2121 }
2122 mutex_spin_exit(&sc->sc_lock);
2123 }
2124 }
2125
2126 static inline void
2127 com_txsoft(struct com_softc *sc, struct tty *tp)
2128 {
2129
2130 CLR(tp->t_state, TS_BUSY);
2131 if (ISSET(tp->t_state, TS_FLUSH))
2132 CLR(tp->t_state, TS_FLUSH);
2133 else
2134 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf));
2135 (*tp->t_linesw->l_start)(tp);
2136 }
2137
2138 static inline void
2139 com_stsoft(struct com_softc *sc, struct tty *tp)
2140 {
2141 u_char msr, delta;
2142
2143 mutex_spin_enter(&sc->sc_lock);
2144 msr = sc->sc_msr;
2145 delta = sc->sc_msr_delta;
2146 sc->sc_msr_delta = 0;
2147 mutex_spin_exit(&sc->sc_lock);
2148
2149 if (ISSET(delta, sc->sc_msr_dcd)) {
2150 /*
2151 * Inform the tty layer that carrier detect changed.
2152 */
2153 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD));
2154 }
2155
2156 if (ISSET(delta, sc->sc_msr_cts)) {
2157 /* Block or unblock output according to flow control. */
2158 if (ISSET(msr, sc->sc_msr_cts)) {
2159 sc->sc_tx_stopped = 0;
2160 (*tp->t_linesw->l_start)(tp);
2161 } else {
2162 sc->sc_tx_stopped = 1;
2163 }
2164 }
2165
2166 #ifdef COM_DEBUG
2167 if (com_debug)
2168 comstatus(sc, "com_stsoft");
2169 #endif
2170 }
2171
2172 void
2173 comsoft(void *arg)
2174 {
2175 struct com_softc *sc = arg;
2176 struct tty *tp;
2177
2178 if (COM_ISALIVE(sc) == 0)
2179 return;
2180
2181 tp = sc->sc_tty;
2182
2183 if (sc->sc_rx_ready) {
2184 sc->sc_rx_ready = 0;
2185 com_rxsoft(sc, tp);
2186 }
2187
2188 if (sc->sc_st_check) {
2189 sc->sc_st_check = 0;
2190 com_stsoft(sc, tp);
2191 }
2192
2193 if (sc->sc_tx_done) {
2194 sc->sc_tx_done = 0;
2195 com_txsoft(sc, tp);
2196 }
2197 }
2198
2199 int
2200 comintr(void *arg)
2201 {
2202 struct com_softc *sc = arg;
2203 struct com_regs *regsp = &sc->sc_regs;
2204
2205 u_char *put, *end;
2206 u_int cc;
2207 u_char lsr, iir;
2208
2209 if (COM_ISALIVE(sc) == 0)
2210 return (0);
2211
2212 KASSERT(regsp != NULL);
2213
2214 mutex_spin_enter(&sc->sc_lock);
2215 iir = CSR_READ_1(regsp, COM_REG_IIR);
2216
2217 /* Handle ns16750-specific busy interrupt. */
2218 if (sc->sc_type == COM_TYPE_16750 &&
2219 (iir & IIR_BUSY) == IIR_BUSY) {
2220 for (int timeout = 10000;
2221 (CSR_READ_1(regsp, COM_REG_USR) & 0x1) != 0; timeout--)
2222 if (timeout <= 0) {
2223 aprint_error_dev(sc->sc_dev,
2224 "timeout while waiting for BUSY interrupt "
2225 "acknowledge\n");
2226 mutex_spin_exit(&sc->sc_lock);
2227 return (0);
2228 }
2229
2230 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr);
2231 iir = CSR_READ_1(regsp, COM_REG_IIR);
2232 }
2233
2234 /* DesignWare APB UART BUSY interrupt */
2235 if (sc->sc_type == COM_TYPE_DW_APB &&
2236 (iir & IIR_BUSY) == IIR_BUSY) {
2237 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
2238 (void)CSR_READ_1(regsp, COM_REG_USR);
2239 } else if ((CSR_READ_1(regsp, COM_REG_USR) & 0x1) != 0) {
2240 CSR_WRITE_1(regsp, COM_REG_HALT, HALT_CHCFG_EN);
2241 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr | LCR_DLAB);
2242 CSR_WRITE_1(regsp, COM_REG_DLBL, sc->sc_dlbl);
2243 CSR_WRITE_1(regsp, COM_REG_DLBH, sc->sc_dlbh);
2244 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr);
2245 CSR_WRITE_1(regsp, COM_REG_HALT,
2246 HALT_CHCFG_EN | HALT_CHCFG_UD);
2247 for (int timeout = 10000000;
2248 (CSR_READ_1(regsp, COM_REG_HALT) & HALT_CHCFG_UD) != 0;
2249 timeout--) {
2250 if (timeout <= 0) {
2251 aprint_error_dev(sc->sc_dev,
2252 "timeout while waiting for HALT "
2253 "update acknowledge 0x%x 0x%x\n",
2254 CSR_READ_1(regsp, COM_REG_HALT),
2255 CSR_READ_1(regsp, COM_REG_USR));
2256 break;
2257 }
2258 }
2259 CSR_WRITE_1(regsp, COM_REG_HALT, 0);
2260 (void)CSR_READ_1(regsp, COM_REG_USR);
2261 } else {
2262 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr | LCR_DLAB);
2263 CSR_WRITE_1(regsp, COM_REG_DLBL, sc->sc_dlbl);
2264 CSR_WRITE_1(regsp, COM_REG_DLBH, sc->sc_dlbh);
2265 CSR_WRITE_1(regsp, COM_REG_LCR, sc->sc_lcr);
2266 }
2267 }
2268
2269 end = sc->sc_ebuf;
2270 put = sc->sc_rbput;
2271 cc = sc->sc_rbavail;
2272
2273 if (ISSET(iir, IIR_NOPEND)) {
2274 if (ISSET(sc->sc_hwflags, COM_HW_BROKEN_ETXRDY))
2275 goto do_tx;
2276 mutex_spin_exit(&sc->sc_lock);
2277 return (0);
2278 }
2279
2280 again: do {
2281 u_char msr, delta;
2282
2283 lsr = CSR_READ_1(regsp, COM_REG_LSR);
2284 if (ISSET(lsr, LSR_BI)) {
2285 int cn_trapped = 0; /* see above: cn_trap() */
2286
2287 cn_check_magic(sc->sc_tty->t_dev,
2288 CNC_BREAK, com_cnm_state);
2289 if (cn_trapped)
2290 continue;
2291 #if defined(KGDB) && !defined(DDB)
2292 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) {
2293 kgdb_connect(1);
2294 continue;
2295 }
2296 #endif
2297 }
2298
2299 if (sc->sc_type == COM_TYPE_BCMAUXUART && ISSET(iir, IIR_RXRDY))
2300 lsr |= LSR_RXRDY;
2301
2302 if (ISSET(lsr, LSR_RCV_MASK) &&
2303 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
2304 while (cc > 0) {
2305 int cn_trapped = 0;
2306 put[0] = CSR_READ_1(regsp, COM_REG_RXDATA);
2307 put[1] = lsr;
2308 cn_check_magic(sc->sc_tty->t_dev,
2309 put[0], com_cnm_state);
2310 if (cn_trapped)
2311 goto next;
2312 put += 2;
2313 if (put >= end)
2314 put = sc->sc_rbuf;
2315 cc--;
2316 next:
2317 lsr = CSR_READ_1(regsp, COM_REG_LSR);
2318 if (!ISSET(lsr, LSR_RCV_MASK))
2319 break;
2320 }
2321
2322 /*
2323 * Current string of incoming characters ended because
2324 * no more data was available or we ran out of space.
2325 * Schedule a receive event if any data was received.
2326 * If we're out of space, turn off receive interrupts.
2327 */
2328 sc->sc_rbput = put;
2329 sc->sc_rbavail = cc;
2330 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED))
2331 sc->sc_rx_ready = 1;
2332
2333 /*
2334 * See if we are in danger of overflowing a buffer. If
2335 * so, use hardware flow control to ease the pressure.
2336 */
2337 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) &&
2338 cc < sc->sc_r_hiwat) {
2339 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED);
2340 com_hwiflow(sc);
2341 }
2342
2343 /*
2344 * If we're out of space, disable receive interrupts
2345 * until the queue has drained a bit.
2346 */
2347 if (!cc) {
2348 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
2349 switch (sc->sc_type) {
2350 case COM_TYPE_PXA2x0:
2351 CLR(sc->sc_ier, IER_ERXRDY|IER_ERXTOUT);
2352 break;
2353 case COM_TYPE_INGENIC:
2354 case COM_TYPE_TEGRA:
2355 CLR(sc->sc_ier,
2356 IER_ERXRDY | IER_ERXTOUT);
2357 break;
2358 default:
2359 CLR(sc->sc_ier, IER_ERXRDY);
2360 break;
2361 }
2362 CSR_WRITE_1(regsp, COM_REG_IER, sc->sc_ier);
2363 }
2364 } else {
2365 if ((iir & (IIR_RXRDY|IIR_TXRDY)) == IIR_RXRDY) {
2366 (void) CSR_READ_1(regsp, COM_REG_RXDATA);
2367 continue;
2368 }
2369 }
2370
2371 msr = CSR_READ_1(regsp, COM_REG_MSR);
2372 delta = msr ^ sc->sc_msr;
2373 sc->sc_msr = msr;
2374 if ((sc->sc_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) &&
2375 (delta & MSR_DCD)) {
2376 mutex_spin_enter(&timecounter_lock);
2377 pps_capture(&sc->sc_pps_state);
2378 pps_event(&sc->sc_pps_state,
2379 (msr & MSR_DCD) ?
2380 PPS_CAPTUREASSERT :
2381 PPS_CAPTURECLEAR);
2382 mutex_spin_exit(&timecounter_lock);
2383 }
2384
2385 /*
2386 * Process normal status changes
2387 */
2388 if (ISSET(delta, sc->sc_msr_mask)) {
2389 SET(sc->sc_msr_delta, delta);
2390
2391 /*
2392 * Stop output immediately if we lose the output
2393 * flow control signal or carrier detect.
2394 */
2395 if (ISSET(~msr, sc->sc_msr_mask)) {
2396 sc->sc_tbc = 0;
2397 sc->sc_heldtbc = 0;
2398 #ifdef COM_DEBUG
2399 if (com_debug)
2400 comstatus(sc, "comintr ");
2401 #endif
2402 }
2403
2404 sc->sc_st_check = 1;
2405 }
2406 } while (!ISSET((iir =
2407 CSR_READ_1(regsp, COM_REG_IIR)), IIR_NOPEND) &&
2408 /*
2409 * Since some device (e.g., ST16C1550) doesn't clear IIR_TXRDY
2410 * by IIR read, so we can't do this way: `process all interrupts,
2411 * then do TX if possible'.
2412 */
2413 (iir & IIR_IMASK) != IIR_TXRDY);
2414
2415 do_tx:
2416 /*
2417 * Read LSR again, since there may be an interrupt between
2418 * the last LSR read and IIR read above.
2419 */
2420 lsr = CSR_READ_1(regsp, COM_REG_LSR);
2421
2422 /*
2423 * See if data can be transmitted as well.
2424 * Schedule tx done event if no data left
2425 * and tty was marked busy.
2426 */
2427 if (ISSET(lsr, LSR_TXRDY)) {
2428 /*
2429 * If we've delayed a parameter change, do it now, and restart
2430 * output.
2431 */
2432 if (sc->sc_heldchange) {
2433 com_loadchannelregs(sc);
2434 sc->sc_heldchange = 0;
2435 sc->sc_tbc = sc->sc_heldtbc;
2436 sc->sc_heldtbc = 0;
2437 }
2438
2439 /* Output the next chunk of the contiguous buffer, if any. */
2440 if (sc->sc_tbc > 0) {
2441 u_int n;
2442
2443 n = sc->sc_tbc;
2444 if (n > sc->sc_fifolen)
2445 n = sc->sc_fifolen;
2446 CSR_WRITE_MULTI(regsp, COM_REG_TXDATA, sc->sc_tba, n);
2447 sc->sc_tbc -= n;
2448 sc->sc_tba += n;
2449 } else {
2450 /* Disable transmit completion interrupts if necessary. */
2451 if (ISSET(sc->sc_ier, IER_ETXRDY)) {
2452 CLR(sc->sc_ier, IER_ETXRDY);
2453 CSR_WRITE_1(regsp, COM_REG_IER, sc->sc_ier);
2454 }
2455 if (sc->sc_tx_busy) {
2456 sc->sc_tx_busy = 0;
2457 sc->sc_tx_done = 1;
2458 }
2459 }
2460 }
2461
2462 if (!ISSET((iir = CSR_READ_1(regsp, COM_REG_IIR)), IIR_NOPEND))
2463 goto again;
2464
2465 mutex_spin_exit(&sc->sc_lock);
2466
2467 /* Wake up the poller. */
2468 if ((sc->sc_rx_ready | sc->sc_st_check | sc->sc_tx_done) != 0)
2469 softint_schedule(sc->sc_si);
2470
2471 #ifdef RND_COM
2472 rnd_add_uint32(&sc->rnd_source, iir | lsr);
2473 #endif
2474
2475 return (1);
2476 }
2477
2478 /*
2479 * The following functions are polled getc and putc routines, shared
2480 * by the console and kgdb glue.
2481 *
2482 * The read-ahead code is so that you can detect pending in-band
2483 * cn_magic in polled mode while doing output rather than having to
2484 * wait until the kernel decides it needs input.
2485 */
2486
2487 #define MAX_READAHEAD 20
2488 static int com_readahead[MAX_READAHEAD];
2489 static int com_readaheadcount = 0;
2490
2491 int
2492 com_common_getc(dev_t dev, struct com_regs *regsp)
2493 {
2494 int s = splserial();
2495 u_char stat, c;
2496
2497 /* got a character from reading things earlier */
2498 if (com_readaheadcount > 0) {
2499 int i;
2500
2501 c = com_readahead[0];
2502 for (i = 1; i < com_readaheadcount; i++) {
2503 com_readahead[i-1] = com_readahead[i];
2504 }
2505 com_readaheadcount--;
2506 splx(s);
2507 return (c);
2508 }
2509
2510 /* don't block until a character becomes available */
2511 if (!ISSET(stat = CSR_READ_1(regsp, COM_REG_LSR), LSR_RXRDY)) {
2512 splx(s);
2513 return -1;
2514 }
2515
2516 c = CSR_READ_1(regsp, COM_REG_RXDATA);
2517 stat = CSR_READ_1(regsp, COM_REG_IIR);
2518 {
2519 int cn_trapped = 0; /* required by cn_trap, see above */
2520 if (!db_active)
2521 cn_check_magic(dev, c, com_cnm_state);
2522 }
2523 splx(s);
2524 return (c);
2525 }
2526
2527 static void
2528 com_common_putc(dev_t dev, struct com_regs *regsp, int c, int with_readahead)
2529 {
2530 int s = splserial();
2531 int cin, stat, timo;
2532
2533 if (with_readahead && com_readaheadcount < MAX_READAHEAD
2534 && ISSET(stat = CSR_READ_1(regsp, COM_REG_LSR), LSR_RXRDY)) {
2535 int cn_trapped = 0;
2536 cin = CSR_READ_1(regsp, COM_REG_RXDATA);
2537 stat = CSR_READ_1(regsp, COM_REG_IIR);
2538 cn_check_magic(dev, cin, com_cnm_state);
2539 com_readahead[com_readaheadcount++] = cin;
2540 }
2541
2542 /* wait for any pending transmission to finish */
2543 timo = 150000;
2544 while (!ISSET(CSR_READ_1(regsp, COM_REG_LSR), LSR_TXRDY) && --timo)
2545 continue;
2546
2547 CSR_WRITE_1(regsp, COM_REG_TXDATA, c);
2548 COM_BARRIER(regsp, BR | BW);
2549
2550 splx(s);
2551 }
2552
2553 /*
2554 * Initialize UART for use as console or KGDB line.
2555 */
2556 int
2557 cominit(struct com_regs *regsp, int rate, int frequency, int type,
2558 tcflag_t cflag)
2559 {
2560
2561 if (bus_space_map(regsp->cr_iot, regsp->cr_iobase, regsp->cr_nports, 0,
2562 ®sp->cr_ioh))
2563 return (ENOMEM); /* ??? */
2564
2565 if (type == COM_TYPE_OMAP) {
2566 /* disable before changing settings */
2567 CSR_WRITE_1(regsp, COM_REG_MDR1, MDR1_MODE_DISABLE);
2568 }
2569
2570 rate = comspeed(rate, frequency, type);
2571 if (rate != -1) {
2572 if (type == COM_TYPE_AU1x00) {
2573 /* no EFR on alchemy */
2574 CSR_WRITE_2(regsp, COM_REG_DLBL, rate);
2575 } else {
2576 if ((type != COM_TYPE_16550_NOERS) &&
2577 (type != COM_TYPE_INGENIC)) {
2578 CSR_WRITE_1(regsp, COM_REG_LCR, LCR_EERS);
2579 CSR_WRITE_1(regsp, COM_REG_EFR, 0);
2580 }
2581 CSR_WRITE_1(regsp, COM_REG_LCR, LCR_DLAB);
2582 CSR_WRITE_1(regsp, COM_REG_DLBL, rate & 0xff);
2583 CSR_WRITE_1(regsp, COM_REG_DLBH, rate >> 8);
2584 }
2585 }
2586 CSR_WRITE_1(regsp, COM_REG_LCR, cflag2lcr(cflag));
2587 CSR_WRITE_1(regsp, COM_REG_MCR, MCR_DTR | MCR_RTS);
2588
2589 if (type == COM_TYPE_INGENIC) {
2590 CSR_WRITE_1(regsp, COM_REG_FIFO,
2591 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
2592 FIFO_TRIGGER_1 | FIFO_UART_ON);
2593 } else {
2594 CSR_WRITE_1(regsp, COM_REG_FIFO,
2595 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
2596 FIFO_TRIGGER_1);
2597 }
2598
2599 if (type == COM_TYPE_OMAP) {
2600 /* setup the fifos. the FCR value is not used as long
2601 as SCR[6] and SCR[7] are 0, which they are at reset
2602 and we never touch the SCR register */
2603 uint8_t rx_fifo_trig = 40;
2604 uint8_t tx_fifo_trig = 60;
2605 uint8_t rx_start = 8;
2606 uint8_t rx_halt = 60;
2607 uint8_t tlr_value = ((rx_fifo_trig>>2) << 4) | (tx_fifo_trig>>2);
2608 uint8_t tcr_value = ((rx_start>>2) << 4) | (rx_halt>>2);
2609
2610 /* enable access to TCR & TLR */
2611 CSR_WRITE_1(regsp, COM_REG_MCR, MCR_DTR | MCR_RTS | MCR_TCR_TLR);
2612
2613 /* write tcr and tlr values */
2614 CSR_WRITE_1(regsp, COM_REG_TLR, tlr_value);
2615 CSR_WRITE_1(regsp, COM_REG_TCR, tcr_value);
2616
2617 /* disable access to TCR & TLR */
2618 CSR_WRITE_1(regsp, COM_REG_MCR, MCR_DTR | MCR_RTS);
2619
2620 /* enable again, but mode is based on speed */
2621 if (rate > 230400) {
2622 CSR_WRITE_1(regsp, COM_REG_MDR1, MDR1_MODE_UART_13X);
2623 } else {
2624 CSR_WRITE_1(regsp, COM_REG_MDR1, MDR1_MODE_UART_16X);
2625 }
2626 }
2627
2628 if (type == COM_TYPE_PXA2x0)
2629 CSR_WRITE_1(regsp, COM_REG_IER, IER_EUART);
2630 else
2631 CSR_WRITE_1(regsp, COM_REG_IER, 0);
2632
2633 return (0);
2634 }
2635
2636 int
2637 comcnattach1(struct com_regs *regsp, int rate, int frequency, int type,
2638 tcflag_t cflag)
2639 {
2640 int res;
2641
2642 comcons_info.regs = *regsp;
2643
2644 res = cominit(&comcons_info.regs, rate, frequency, type, cflag);
2645 if (res)
2646 return (res);
2647
2648 cn_tab = &comcons;
2649 cn_init_magic(&com_cnm_state);
2650 cn_set_magic("\047\001"); /* default magic is BREAK */
2651
2652 comcons_info.frequency = frequency;
2653 comcons_info.type = type;
2654 comcons_info.rate = rate;
2655 comcons_info.cflag = cflag;
2656
2657 return (0);
2658 }
2659
2660 int
2661 comcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency,
2662 int type, tcflag_t cflag)
2663 {
2664 struct com_regs regs;
2665
2666 /*XXX*/
2667 bus_space_handle_t dummy_bsh;
2668 memset(&dummy_bsh, 0, sizeof(dummy_bsh));
2669
2670 /*
2671 * dummy_bsh required because com_init_regs() wants it. A
2672 * real bus_space_handle will be filled in by cominit() later.
2673 * XXXJRT Detangle this mess eventually, plz.
2674 */
2675 com_init_regs(®s, iot, dummy_bsh/*XXX*/, iobase);
2676
2677 return comcnattach1(®s, rate, frequency, type, cflag);
2678 }
2679
2680 static int
2681 comcnreattach(void)
2682 {
2683 return comcnattach1(&comcons_info.regs, comcons_info.rate,
2684 comcons_info.frequency, comcons_info.type, comcons_info.cflag);
2685 }
2686
2687 int
2688 comcngetc(dev_t dev)
2689 {
2690
2691 return (com_common_getc(dev, &comcons_info.regs));
2692 }
2693
2694 /*
2695 * Console kernel output character routine.
2696 */
2697 void
2698 comcnputc(dev_t dev, int c)
2699 {
2700
2701 com_common_putc(dev, &comcons_info.regs, c, cold);
2702 }
2703
2704 void
2705 comcnpollc(dev_t dev, int on)
2706 {
2707
2708 com_readaheadcount = 0;
2709 }
2710
2711 #ifdef KGDB
2712 int
2713 com_kgdb_attach1(struct com_regs *regsp, int rate, int frequency, int type,
2714 tcflag_t cflag)
2715 {
2716 int res;
2717
2718 if (bus_space_is_equal(regsp->cr_iot, comcons_info.regs.cr_iot) &&
2719 regsp->cr_iobase == comcons_info.regs.cr_iobase) {
2720 #if !defined(DDB)
2721 return (EBUSY); /* cannot share with console */
2722 #else
2723 comkgdbregs = *regsp;
2724 comkgdbregs.cr_ioh = comcons_info.regs.cr_ioh;
2725 #endif
2726 } else {
2727 comkgdbregs = *regsp;
2728 res = cominit(&comkgdbregs, rate, frequency, type, cflag);
2729 if (res)
2730 return (res);
2731
2732 /*
2733 * XXXfvdl this shouldn't be needed, but the cn_magic goo
2734 * expects this to be initialized
2735 */
2736 cn_init_magic(&com_cnm_state);
2737 cn_set_magic("\047\001");
2738 }
2739
2740 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL);
2741 kgdb_dev = 123; /* unneeded, only to satisfy some tests */
2742
2743 return (0);
2744 }
2745
2746 int
2747 com_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate,
2748 int frequency, int type, tcflag_t cflag)
2749 {
2750 struct com_regs regs;
2751
2752 com_init_regs(®s, iot, (bus_space_handle_t)0/*XXX*/, iobase);
2753
2754 return com_kgdb_attach1(®s, rate, frequency, type, cflag);
2755 }
2756
2757 /* ARGSUSED */
2758 int
2759 com_kgdb_getc(void *arg)
2760 {
2761
2762 return (com_common_getc(NODEV, &comkgdbregs));
2763 }
2764
2765 /* ARGSUSED */
2766 void
2767 com_kgdb_putc(void *arg, int c)
2768 {
2769
2770 com_common_putc(NODEV, &comkgdbregs, c, 0);
2771 }
2772 #endif /* KGDB */
2773
2774 /*
2775 * helper function to identify the com ports used by
2776 * console or KGDB (and not yet autoconf attached)
2777 */
2778 int
2779 com_is_console(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t *ioh)
2780 {
2781 bus_space_handle_t help;
2782
2783 if (!comconsattached &&
2784 bus_space_is_equal(iot, comcons_info.regs.cr_iot) &&
2785 iobase == comcons_info.regs.cr_iobase)
2786 help = comcons_info.regs.cr_ioh;
2787 #ifdef KGDB
2788 else if (!com_kgdb_attached &&
2789 bus_space_is_equal(iot, comkgdbregs.cr_iot) &&
2790 iobase == comkgdbregs.cr_iobase)
2791 help = comkgdbregs.cr_ioh;
2792 #endif
2793 else
2794 return (0);
2795
2796 if (ioh)
2797 *ioh = help;
2798 return (1);
2799 }
2800
2801 /*
2802 * this routine exists to serve as a shutdown hook for systems that
2803 * have firmware which doesn't interact properly with a com device in
2804 * FIFO mode.
2805 */
2806 bool
2807 com_cleanup(device_t self, int how)
2808 {
2809 struct com_softc *sc = device_private(self);
2810
2811 if (ISSET(sc->sc_hwflags, COM_HW_FIFO))
2812 CSR_WRITE_1(&sc->sc_regs, COM_REG_FIFO, 0);
2813
2814 return true;
2815 }
2816
2817 bool
2818 com_suspend(device_t self, const pmf_qual_t *qual)
2819 {
2820 struct com_softc *sc = device_private(self);
2821
2822 CSR_WRITE_1(&sc->sc_regs, COM_REG_IER, 0);
2823 (void)CSR_READ_1(&sc->sc_regs, COM_REG_IIR);
2824
2825 return true;
2826 }
2827
2828 bool
2829 com_resume(device_t self, const pmf_qual_t *qual)
2830 {
2831 struct com_softc *sc = device_private(self);
2832
2833 mutex_spin_enter(&sc->sc_lock);
2834 com_loadchannelregs(sc);
2835 mutex_spin_exit(&sc->sc_lock);
2836
2837 return true;
2838 }
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