com.c revision 1.380
1 /* $NetBSD: com.c,v 1.380 2022/12/03 11:28:38 skrll 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 1.380 2022/12/03 11:28:38 skrll 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 } 2839
Indexes created Thu Sep 25 16:09:42 GMT 2025