1 /* $NetBSD: imxuart.c,v 1.9 2012/02/02 19:42:58 tls Exp $ */ 2 3 /* 4 * Copyright (c) 2009, 2010 Genetec Corporation. All rights reserved. 5 * Written by Hiroyuki Bessho for Genetec Corporation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GENETEC CORPORATION 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 */ 29 30 /* 31 * derived from sys/dev/ic/com.c 32 */ 33 34 /*- 35 * Copyright (c) 1998, 1999, 2004, 2008 The NetBSD Foundation, Inc. 36 * All rights reserved. 37 * 38 * This code is derived from software contributed to The NetBSD Foundation 39 * by Charles M. Hannum. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 51 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 52 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 53 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 54 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 55 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 56 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 57 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 58 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 59 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 60 * POSSIBILITY OF SUCH DAMAGE. 61 */ 62 63 /* 64 * Copyright (c) 1991 The Regents of the University of California. 65 * All rights reserved. 66 * 67 * Redistribution and use in source and binary forms, with or without 68 * modification, are permitted provided that the following conditions 69 * are met: 70 * 1. Redistributions of source code must retain the above copyright 71 * notice, this list of conditions and the following disclaimer. 72 * 2. Redistributions in binary form must reproduce the above copyright 73 * notice, this list of conditions and the following disclaimer in the 74 * documentation and/or other materials provided with the distribution. 75 * 3. Neither the name of the University nor the names of its contributors 76 * may be used to endorse or promote products derived from this software 77 * without specific prior written permission. 78 * 79 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 80 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 81 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 82 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 83 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 84 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 85 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 86 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 87 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 88 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 89 * SUCH DAMAGE. 90 * 91 * @(#)com.c 7.5 (Berkeley) 5/16/91 92 */ 93 94 /* 95 * driver for UART in i.MX SoC. 96 */ 97 98 #include <sys/cdefs.h> 99 __KERNEL_RCSID(0, "$NetBSD: imxuart.c,v 1.9 2012/02/02 19:42:58 tls Exp $"); 100 101 #include "opt_imxuart.h" 102 #include "opt_ddb.h" 103 #include "opt_kgdb.h" 104 #include "opt_lockdebug.h" 105 #include "opt_multiprocessor.h" 106 #include "opt_ntp.h" 107 #include "opt_imxuart.h" 108 #include "opt_imx.h" 109 110 #include "rnd.h" 111 #ifdef RND_COM 112 #include <sys/rnd.h> 113 #endif 114 115 #ifndef IMXUART_TOLERANCE 116 #define IMXUART_TOLERANCE 30 /* baud rate tolerance, in 0.1% units */ 117 #endif 118 119 #ifndef IMXUART_FREQDIV 120 #define IMXUART_FREQDIV 2 /* XXX */ 121 #endif 122 123 #ifndef IMXUART_FREQ 124 #define IMXUART_FREQ (56900000) 125 #endif 126 127 /* 128 * Override cnmagic(9) macro before including <sys/systm.h>. 129 * We need to know if cn_check_magic triggered debugger, so set a flag. 130 * Callers of cn_check_magic must declare int cn_trapped = 0; 131 * XXX: this is *ugly*! 132 */ 133 #define cn_trap() \ 134 do { \ 135 console_debugger(); \ 136 cn_trapped = 1; \ 137 } while (/* CONSTCOND */ 0) 138 139 #include <sys/param.h> 140 #include <sys/systm.h> 141 #include <sys/ioctl.h> 142 #include <sys/select.h> 143 #include <sys/poll.h> 144 #include <sys/tty.h> 145 #include <sys/proc.h> 146 #include <sys/conf.h> 147 #include <sys/file.h> 148 #include <sys/uio.h> 149 #include <sys/kernel.h> 150 #include <sys/syslog.h> 151 #include <sys/device.h> 152 #include <sys/malloc.h> 153 #include <sys/timepps.h> 154 #include <sys/vnode.h> 155 #include <sys/kauth.h> 156 #include <sys/intr.h> 157 158 #include <sys/bus.h> 159 160 #include <arm/imx/imxuartreg.h> 161 #include <arm/imx/imxuartvar.h> 162 #include <dev/cons.h> 163 164 #ifndef IMXUART_RING_SIZE 165 #define IMXUART_RING_SIZE 2048 166 #endif 167 168 typedef struct imxuart_softc { 169 device_t sc_dev; 170 171 struct imxuart_regs { 172 bus_space_tag_t ur_iot; 173 bus_space_handle_t ur_ioh; 174 bus_addr_t ur_iobase; 175 #if 0 176 bus_size_t ur_nports; 177 bus_size_t ur_map[16]; 178 #endif 179 } sc_regs; 180 181 #define sc_bt sc_regs.ur_iot 182 #define sc_bh sc_regs.ur_ioh 183 184 uint32_t sc_intrspec_enb; 185 uint32_t sc_ucr2_d; /* target value for UCR2 */ 186 uint32_t sc_ucr[4]; /* cached value of UCRn */ 187 #define sc_ucr1 sc_ucr[0] 188 #define sc_ucr2 sc_ucr[1] 189 #define sc_ucr3 sc_ucr[2] 190 #define sc_ucr4 sc_ucr[3] 191 192 uint sc_init_cnt; 193 194 bus_addr_t sc_addr; 195 bus_size_t sc_size; 196 int sc_intr; 197 198 u_char sc_hwflags; 199 /* Hardware flag masks */ 200 #define IMXUART_HW_FLOW __BIT(0) 201 #define IMXUART_HW_DEV_OK __BIT(1) 202 #define IMXUART_HW_CONSOLE __BIT(2) 203 #define IMXUART_HW_KGDB __BIT(3) 204 205 206 bool enabled; 207 208 u_char sc_swflags; 209 210 u_char sc_rx_flags; 211 #define IMXUART_RX_TTY_BLOCKED __BIT(0) 212 #define IMXUART_RX_TTY_OVERFLOWED __BIT(1) 213 #define IMXUART_RX_IBUF_BLOCKED __BIT(2) 214 #define IMXUART_RX_IBUF_OVERFLOWED __BIT(3) 215 #define IMXUART_RX_ANY_BLOCK \ 216 (IMXUART_RX_TTY_BLOCKED|IMXUART_RX_TTY_OVERFLOWED| \ 217 IMXUART_RX_IBUF_BLOCKED|IMXUART_RX_IBUF_OVERFLOWED) 218 219 bool sc_tx_busy, sc_tx_done, sc_tx_stopped; 220 bool sc_rx_ready,sc_st_check; 221 u_short sc_txfifo_len, sc_txfifo_thresh; 222 223 uint16_t *sc_rbuf; 224 u_int sc_rbuf_size; 225 u_int sc_rbuf_in; 226 u_int sc_rbuf_out; 227 #define IMXUART_RBUF_AVAIL(sc) \ 228 ((sc->sc_rbuf_out <= sc->sc_rbuf_in) ? \ 229 (sc->sc_rbuf_in - sc->sc_rbuf_out) : \ 230 (sc->sc_rbuf_size - (sc->sc_rbuf_out - sc->sc_rbuf_in))) 231 232 #define IMXUART_RBUF_SPACE(sc) \ 233 ((sc->sc_rbuf_in <= sc->sc_rbuf_out ? \ 234 sc->sc_rbuf_size - (sc->sc_rbuf_out - sc->sc_rbuf_in) : \ 235 sc->sc_rbuf_in - sc->sc_rbuf_out) - 1) 236 /* increment ringbuffer pointer */ 237 #define IMXUART_RBUF_INC(sc,v,i) (((v) + (i))&((sc->sc_rbuf_size)-1)) 238 u_int sc_r_lowat; 239 u_int sc_r_hiwat; 240 241 /* output chunk */ 242 u_char *sc_tba; 243 u_int sc_tbc; 244 u_int sc_heldtbc; 245 /* pending parameter changes */ 246 u_char sc_pending; 247 #define IMXUART_PEND_PARAM __BIT(0) 248 #define IMXUART_PEND_SPEED __BIT(1) 249 250 251 struct callout sc_diag_callout; 252 kmutex_t sc_lock; 253 void *sc_ih; /* interrupt handler */ 254 void *sc_si; /* soft interrupt */ 255 struct tty *sc_tty; 256 257 /* power management hooks */ 258 int (*enable)(struct imxuart_softc *); 259 void (*disable)(struct imxuart_softc *); 260 261 struct { 262 ulong err; 263 ulong brk; 264 ulong prerr; 265 ulong frmerr; 266 ulong ovrrun; 267 } sc_errors; 268 269 struct imxuart_baudrate_ratio { 270 uint16_t numerator; /* UBIR */ 271 uint16_t modulator; /* UBMR */ 272 } sc_ratio; 273 274 } imxuart_softc_t; 275 276 277 int imxuspeed(long, struct imxuart_baudrate_ratio *); 278 int imxuparam(struct tty *, struct termios *); 279 void imxustart(struct tty *); 280 int imxuhwiflow(struct tty *, int); 281 282 void imxuart_shutdown(struct imxuart_softc *); 283 void imxuart_loadchannelregs(struct imxuart_softc *); 284 void imxuart_hwiflow(struct imxuart_softc *); 285 void imxuart_break(struct imxuart_softc *, bool); 286 void imxuart_modem(struct imxuart_softc *, int); 287 void tiocm_to_imxu(struct imxuart_softc *, u_long, int); 288 int imxuart_to_tiocm(struct imxuart_softc *); 289 void imxuart_iflush(struct imxuart_softc *); 290 int imxuintr(void *); 291 292 int imxuart_common_getc(dev_t, struct imxuart_regs *); 293 void imxuart_common_putc(dev_t, struct imxuart_regs *, int); 294 295 296 int imxuart_init(struct imxuart_regs *, int, tcflag_t); 297 298 int imxucngetc(dev_t); 299 void imxucnputc(dev_t, int); 300 void imxucnpollc(dev_t, int); 301 302 static void imxuintr_read(struct imxuart_softc *); 303 static void imxuintr_send(struct imxuart_softc *); 304 305 static void imxuart_enable_debugport(struct imxuart_softc *); 306 static void imxuart_disable_all_interrupts(struct imxuart_softc *); 307 static void imxuart_control_rxint(struct imxuart_softc *, bool); 308 static void imxuart_control_txint(struct imxuart_softc *, bool); 309 static u_int imxuart_txfifo_space(struct imxuart_softc *sc); 310 311 static uint32_t cflag_to_ucr2(tcflag_t, uint32_t); 312 313 CFATTACH_DECL_NEW(imxuart, sizeof(struct imxuart_softc), 314 imxuart_match, imxuart_attach, NULL, NULL); 315 316 317 #define integrate static inline 318 void imxusoft(void *); 319 integrate void imxuart_rxsoft(struct imxuart_softc *, struct tty *); 320 integrate void imxuart_txsoft(struct imxuart_softc *, struct tty *); 321 integrate void imxuart_stsoft(struct imxuart_softc *, struct tty *); 322 integrate void imxuart_schedrx(struct imxuart_softc *); 323 void imxudiag(void *); 324 static void imxuart_load_speed(struct imxuart_softc *); 325 static void imxuart_load_params(struct imxuart_softc *); 326 integrate void imxuart_load_pendings(struct imxuart_softc *); 327 328 329 extern struct cfdriver imxuart_cd; 330 331 dev_type_open(imxuopen); 332 dev_type_close(imxuclose); 333 dev_type_read(imxuread); 334 dev_type_write(imxuwrite); 335 dev_type_ioctl(imxuioctl); 336 dev_type_stop(imxustop); 337 dev_type_tty(imxutty); 338 dev_type_poll(imxupoll); 339 340 const struct cdevsw imxcom_cdevsw = { 341 imxuopen, imxuclose, imxuread, imxuwrite, imxuioctl, 342 imxustop, imxutty, imxupoll, nommap, ttykqfilter, D_TTY 343 }; 344 345 /* 346 * Make this an option variable one can patch. 347 * But be warned: this must be a power of 2! 348 */ 349 u_int imxuart_rbuf_size = IMXUART_RING_SIZE; 350 351 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 352 u_int imxuart_rbuf_hiwat = (IMXUART_RING_SIZE * 1) / 4; 353 u_int imxuart_rbuf_lowat = (IMXUART_RING_SIZE * 3) / 4; 354 355 static struct imxuart_regs imxuconsregs; 356 static int imxuconsattached; 357 static int imxuconsrate; 358 static tcflag_t imxuconscflag; 359 static struct cnm_state imxuart_cnm_state; 360 361 u_int imxuart_freq = IMXUART_FREQ; 362 u_int imxuart_freqdiv = IMXUART_FREQDIV; 363 364 #ifdef KGDB 365 #include <sys/kgdb.h> 366 367 static struct imxuart_regs imxu_kgdb_regs; 368 static int imxu_kgdb_attached; 369 370 int imxuart_kgdb_getc(void *); 371 void imxuart_kgdb_putc(void *, int); 372 #endif /* KGDB */ 373 374 #define IMXUART_UNIT_MASK 0x7ffff 375 #define IMXUART_DIALOUT_MASK 0x80000 376 377 #define IMXUART_UNIT(x) (minor(x) & IMXUART_UNIT_MASK) 378 #define IMXUART_DIALOUT(x) (minor(x) & IMXUART_DIALOUT_MASK) 379 380 #define IMXUART_ISALIVE(sc) ((sc)->enabled != 0 && \ 381 device_is_active((sc)->sc_dev)) 382 383 #define BR BUS_SPACE_BARRIER_READ 384 #define BW BUS_SPACE_BARRIER_WRITE 385 #define IMXUART_BARRIER(r, f) \ 386 bus_space_barrier((r)->ur_iot, (r)->ur_ioh, 0, IMX_UART_SIZE, (f)) 387 388 389 void 390 imxuart_attach_common(device_t parent, device_t self, 391 bus_space_tag_t iot, paddr_t iobase, size_t size, int intr, int flags) 392 { 393 imxuart_softc_t *sc = device_private(self); 394 struct imxuart_regs *regsp = &sc->sc_regs; 395 struct tty *tp; 396 bus_space_handle_t ioh; 397 398 aprint_naive("\n"); 399 aprint_normal("\n"); 400 401 sc->sc_dev = self; 402 403 if (size <= 0) 404 size = IMX_UART_SIZE; 405 406 sc->sc_intr = intr; 407 regsp->ur_iot = iot; 408 regsp->ur_iobase = iobase; 409 410 if (bus_space_map(iot, regsp->ur_iobase, size, 0, &ioh)) { 411 return; 412 } 413 regsp->ur_ioh = ioh; 414 415 callout_init(&sc->sc_diag_callout, 0); 416 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH); 417 418 bus_space_read_region_4(iot, ioh, IMX_UCR1, sc->sc_ucr, 4); 419 sc->sc_ucr2_d = sc->sc_ucr2; 420 421 /* Disable interrupts before configuring the device. */ 422 imxuart_disable_all_interrupts(sc); 423 424 if (regsp->ur_iobase == imxuconsregs.ur_iobase) { 425 imxuconsattached = 1; 426 427 /* Make sure the console is always "hardwired". */ 428 #if 0 429 delay(10000); /* wait for output to finish */ 430 #endif 431 SET(sc->sc_hwflags, IMXUART_HW_CONSOLE); 432 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 433 } 434 435 436 tp = tty_alloc(); 437 tp->t_oproc = imxustart; 438 tp->t_param = imxuparam; 439 tp->t_hwiflow = imxuhwiflow; 440 441 sc->sc_tty = tp; 442 sc->sc_rbuf = malloc(sizeof (*sc->sc_rbuf) * imxuart_rbuf_size, 443 M_DEVBUF, M_NOWAIT); 444 sc->sc_rbuf_size = imxuart_rbuf_size; 445 sc->sc_rbuf_in = sc->sc_rbuf_out = 0; 446 if (sc->sc_rbuf == NULL) { 447 aprint_error_dev(sc->sc_dev, 448 "unable to allocate ring buffer\n"); 449 return; 450 } 451 452 sc->sc_txfifo_len = 32; 453 sc->sc_txfifo_thresh = 16; /* when USR1.TRDY, fifo has space 454 * for this many characters */ 455 456 tty_attach(tp); 457 458 if (ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 459 int maj; 460 461 /* locate the major number */ 462 maj = cdevsw_lookup_major(&imxcom_cdevsw); 463 464 if (maj != NODEVMAJOR) { 465 tp->t_dev = cn_tab->cn_dev = makedev(maj, 466 device_unit(sc->sc_dev)); 467 468 aprint_normal_dev(sc->sc_dev, "console\n"); 469 } 470 } 471 472 sc->sc_ih = intr_establish(sc->sc_intr, IPL_SERIAL, IST_LEVEL, 473 imxuintr, sc); 474 if (sc->sc_ih == NULL) 475 aprint_error_dev(sc->sc_dev, "intr_establish failed\n"); 476 477 #ifdef KGDB 478 /* 479 * Allow kgdb to "take over" this port. If this is 480 * not the console and is the kgdb device, it has 481 * exclusive use. If it's the console _and_ the 482 * kgdb device, it doesn't. 483 */ 484 if (regsp->ur_iobase == imxu_kgdb_regs.ur_iobase) { 485 if (!ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 486 imxu_kgdb_attached = 1; 487 488 SET(sc->sc_hwflags, IMXUART_HW_KGDB); 489 } 490 aprint_normal_dev(sc->sc_dev, "kgdb\n"); 491 } 492 #endif 493 494 sc->sc_si = softint_establish(SOFTINT_SERIAL, imxusoft, sc); 495 496 #ifdef RND_COM 497 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), 498 RND_TYPE_TTY, 0); 499 #endif 500 501 /* if there are no enable/disable functions, assume the device 502 is always enabled */ 503 if (!sc->enable) 504 sc->enabled = 1; 505 506 imxuart_enable_debugport(sc); 507 508 SET(sc->sc_hwflags, IMXUART_HW_DEV_OK); 509 510 //shutdownhook_establish(imxuart_shutdownhook, sc); 511 512 513 #if 0 514 { 515 uint32_t reg; 516 reg = bus_space_read_4(iot, ioh, IMX_UCR1); 517 reg |= IMX_UCR1_TXDMAEN | IMX_UCR1_RXDMAEN; 518 bus_space_write_4(iot, ioh, IMX_UCR1, reg); 519 } 520 #endif 521 } 522 523 /* 524 * baudrate = RefFreq / (16 * (UMBR + 1)/(UBIR + 1)) 525 * 526 * (UBIR + 1) / (UBMR + 1) = (16 * BaurdRate) / RefFreq 527 */ 528 529 static long 530 gcd(long m, long n) 531 { 532 533 if (m < n) 534 return gcd(n, m); 535 536 if (n <= 0) 537 return m; 538 return gcd(n, m % n); 539 } 540 541 542 int 543 imxuspeed(long speed, struct imxuart_baudrate_ratio *ratio) 544 { 545 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 546 long b = 16 * speed; 547 long f = imxuart_freq / imxuart_freqdiv; 548 long d; 549 int err = 0; 550 551 /* reduce b/f */ 552 while ((f > (1<<16) || b > (1<<16)) && (d = gcd(f, b)) > 1) { 553 f /= d; 554 b /= d; 555 } 556 557 558 while (f > (1<<16) || b > (1<<16)) { 559 f /= 2; 560 b /= 2; 561 } 562 if (f <= 0 || b <= 0) 563 return -1; 564 565 #ifdef DIAGNOSTIC 566 err = divrnd(((uint64_t)imxuart_freq) * 1000 / imxuart_freqdiv, 567 (uint64_t)speed * 16 * f / b) - 1000; 568 if (err < 0) 569 err = -err; 570 #endif 571 572 ratio->numerator = b-1; 573 ratio->modulator = f-1; 574 575 if (err > IMXUART_TOLERANCE) 576 return -1; 577 578 return 0; 579 #undef divrnd 580 } 581 582 #ifdef IMXUART_DEBUG 583 int imxuart_debug = 0; 584 585 void imxustatus(struct imxuart_softc *, const char *); 586 void 587 imxustatus(struct imxuart_softc *sc, const char *str) 588 { 589 struct tty *tp = sc->sc_tty; 590 591 aprint_normal_dev(sc->sc_dev, 592 "%s %cclocal %cdcd %cts_carr_on %cdtr %ctx_stopped\n", 593 str, 594 ISSET(tp->t_cflag, CLOCAL) ? '+' : '-', 595 ISSET(sc->sc_msr, MSR_DCD) ? '+' : '-', 596 ISSET(tp->t_state, TS_CARR_ON) ? '+' : '-', 597 ISSET(sc->sc_mcr, MCR_DTR) ? '+' : '-', 598 sc->sc_tx_stopped ? '+' : '-'); 599 600 aprint_normal_dev(sc->sc_dev, 601 "%s %ccrtscts %ccts %cts_ttstop %crts rx_flags=0x%x\n", 602 str, 603 ISSET(tp->t_cflag, CRTSCTS) ? '+' : '-', 604 ISSET(sc->sc_msr, MSR_CTS) ? '+' : '-', 605 ISSET(tp->t_state, TS_TTSTOP) ? '+' : '-', 606 ISSET(sc->sc_mcr, MCR_RTS) ? '+' : '-', 607 sc->sc_rx_flags); 608 } 609 #endif 610 611 #if 0 612 int 613 imxuart_detach(device_t self, int flags) 614 { 615 struct imxuart_softc *sc = device_private(self); 616 int maj, mn; 617 618 if (ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) 619 return EBUSY; 620 621 /* locate the major number */ 622 maj = cdevsw_lookup_major(&imxcom_cdevsw); 623 624 /* Nuke the vnodes for any open instances. */ 625 mn = device_unit(self); 626 vdevgone(maj, mn, mn, VCHR); 627 628 mn |= IMXUART_DIALOUT_MASK; 629 vdevgone(maj, mn, mn, VCHR); 630 631 if (sc->sc_rbuf == NULL) { 632 /* 633 * Ring buffer allocation failed in the imxuart_attach_subr, 634 * only the tty is allocated, and nothing else. 635 */ 636 tty_free(sc->sc_tty); 637 return 0; 638 } 639 640 /* Free the receive buffer. */ 641 free(sc->sc_rbuf, M_DEVBUF); 642 643 /* Detach and free the tty. */ 644 tty_detach(sc->sc_tty); 645 tty_free(sc->sc_tty); 646 647 /* Unhook the soft interrupt handler. */ 648 softint_disestablish(sc->sc_si); 649 650 #ifdef RND_COM 651 /* Unhook the entropy source. */ 652 rnd_detach_source(&sc->rnd_source); 653 #endif 654 callout_destroy(&sc->sc_diag_callout); 655 656 /* Destroy the lock. */ 657 mutex_destroy(&sc->sc_lock); 658 659 return (0); 660 } 661 #endif 662 663 #ifdef notyet 664 int 665 imxuart_activate(device_t self, enum devact act) 666 { 667 struct imxuart_softc *sc = device_private(self); 668 int rv = 0; 669 670 switch (act) { 671 case DVACT_ACTIVATE: 672 rv = EOPNOTSUPP; 673 break; 674 675 case DVACT_DEACTIVATE: 676 if (sc->sc_hwflags & (IMXUART_HW_CONSOLE|IMXUART_HW_KGDB)) { 677 rv = EBUSY; 678 break; 679 } 680 681 if (sc->disable != NULL && sc->enabled != 0) { 682 (*sc->disable)(sc); 683 sc->enabled = 0; 684 } 685 break; 686 } 687 688 return (rv); 689 } 690 #endif 691 692 void 693 imxuart_shutdown(struct imxuart_softc *sc) 694 { 695 struct tty *tp = sc->sc_tty; 696 697 mutex_spin_enter(&sc->sc_lock); 698 699 /* If we were asserting flow control, then deassert it. */ 700 SET(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED); 701 imxuart_hwiflow(sc); 702 703 /* Clear any break condition set with TIOCSBRK. */ 704 imxuart_break(sc, false); 705 706 /* 707 * Hang up if necessary. Wait a bit, so the other side has time to 708 * notice even if we immediately open the port again. 709 * Avoid tsleeping above splhigh(). 710 */ 711 if (ISSET(tp->t_cflag, HUPCL)) { 712 imxuart_modem(sc, 0); 713 mutex_spin_exit(&sc->sc_lock); 714 /* XXX will only timeout */ 715 (void) kpause(ttclos, false, hz, NULL); 716 mutex_spin_enter(&sc->sc_lock); 717 } 718 719 /* Turn off interrupts. */ 720 imxuart_disable_all_interrupts(sc); 721 /* re-enable recv interrupt for console or kgdb port */ 722 imxuart_enable_debugport(sc); 723 724 mutex_spin_exit(&sc->sc_lock); 725 726 #ifdef notyet 727 if (sc->disable) { 728 #ifdef DIAGNOSTIC 729 if (!sc->enabled) 730 panic("imxuart_shutdown: not enabled?"); 731 #endif 732 (*sc->disable)(sc); 733 sc->enabled = 0; 734 } 735 #endif 736 } 737 738 int 739 imxuopen(dev_t dev, int flag, int mode, struct lwp *l) 740 { 741 struct imxuart_softc *sc; 742 struct tty *tp; 743 int s; 744 int error; 745 746 sc = device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 747 if (sc == NULL || !ISSET(sc->sc_hwflags, IMXUART_HW_DEV_OK) || 748 sc->sc_rbuf == NULL) 749 return (ENXIO); 750 751 if (!device_is_active(sc->sc_dev)) 752 return (ENXIO); 753 754 #ifdef KGDB 755 /* 756 * If this is the kgdb port, no other use is permitted. 757 */ 758 if (ISSET(sc->sc_hwflags, IMXUART_HW_KGDB)) 759 return (EBUSY); 760 #endif 761 762 tp = sc->sc_tty; 763 764 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 765 return (EBUSY); 766 767 s = spltty(); 768 769 /* 770 * Do the following iff this is a first open. 771 */ 772 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 773 struct termios t; 774 775 tp->t_dev = dev; 776 777 778 #ifdef notyet 779 if (sc->enable) { 780 if ((*sc->enable)(sc)) { 781 splx(s); 782 aprint_error_dev(sc->sc_dev, 783 "device enable failed\n"); 784 return (EIO); 785 } 786 sc->enabled = 1; 787 } 788 #endif 789 790 mutex_spin_enter(&sc->sc_lock); 791 792 imxuart_disable_all_interrupts(sc); 793 794 /* Fetch the current modem control status, needed later. */ 795 796 #ifdef IMXUART_PPS 797 /* Clear PPS capture state on first open. */ 798 mutex_spin_enter(&timecounter_lock); 799 memset(&sc->sc_pps_state, 0, sizeof(sc->sc_pps_state)); 800 sc->sc_pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 801 pps_init(&sc->sc_pps_state); 802 mutex_spin_exit(&timecounter_lock); 803 #endif 804 805 mutex_spin_exit(&sc->sc_lock); 806 807 /* 808 * Initialize the termios status to the defaults. Add in the 809 * sticky bits from TIOCSFLAGS. 810 */ 811 if (ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 812 t.c_ospeed = imxuconsrate; 813 t.c_cflag = imxuconscflag; 814 } else { 815 t.c_ospeed = TTYDEF_SPEED; 816 t.c_cflag = TTYDEF_CFLAG; 817 } 818 t.c_ispeed = t.c_ospeed; 819 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 820 SET(t.c_cflag, CLOCAL); 821 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 822 SET(t.c_cflag, CRTSCTS); 823 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 824 SET(t.c_cflag, MDMBUF); 825 /* Make sure imxuparam() will do something. */ 826 tp->t_ospeed = 0; 827 (void) imxuparam(tp, &t); 828 tp->t_iflag = TTYDEF_IFLAG; 829 tp->t_oflag = TTYDEF_OFLAG; 830 tp->t_lflag = TTYDEF_LFLAG; 831 ttychars(tp); 832 ttsetwater(tp); 833 834 mutex_spin_enter(&sc->sc_lock); 835 836 /* 837 * Turn on DTR. We must always do this, even if carrier is not 838 * present, because otherwise we'd have to use TIOCSDTR 839 * immediately after setting CLOCAL, which applications do not 840 * expect. We always assert DTR while the device is open 841 * unless explicitly requested to deassert it. 842 */ 843 imxuart_modem(sc, 1); 844 845 /* Clear the input ring, and unblock. */ 846 sc->sc_rbuf_in = sc->sc_rbuf_out = 0; 847 imxuart_iflush(sc); 848 CLR(sc->sc_rx_flags, IMXUART_RX_ANY_BLOCK); 849 imxuart_hwiflow(sc); 850 851 /* Turn on interrupts. */ 852 imxuart_control_rxint(sc, true); 853 854 #ifdef IMXUART_DEBUG 855 if (imxuart_debug) 856 imxustatus(sc, "imxuopen "); 857 #endif 858 859 mutex_spin_exit(&sc->sc_lock); 860 } 861 862 splx(s); 863 864 #if 0 865 error = ttyopen(tp, IMXUART_DIALOUT(dev), ISSET(flag, O_NONBLOCK)); 866 #else 867 error = ttyopen(tp, 1, ISSET(flag, O_NONBLOCK)); 868 #endif 869 if (error) 870 goto bad; 871 872 error = (*tp->t_linesw->l_open)(dev, tp); 873 if (error) 874 goto bad; 875 876 return (0); 877 878 bad: 879 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 880 /* 881 * We failed to open the device, and nobody else had it opened. 882 * Clean up the state as appropriate. 883 */ 884 imxuart_shutdown(sc); 885 } 886 887 return (error); 888 } 889 890 int 891 imxuclose(dev_t dev, int flag, int mode, struct lwp *l) 892 { 893 struct imxuart_softc *sc = 894 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 895 struct tty *tp = sc->sc_tty; 896 897 /* XXX This is for cons.c. */ 898 if (!ISSET(tp->t_state, TS_ISOPEN)) 899 return (0); 900 901 (*tp->t_linesw->l_close)(tp, flag); 902 ttyclose(tp); 903 904 if (IMXUART_ISALIVE(sc) == 0) 905 return (0); 906 907 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 908 /* 909 * Although we got a last close, the device may still be in 910 * use; e.g. if this was the dialout node, and there are still 911 * processes waiting for carrier on the non-dialout node. 912 */ 913 imxuart_shutdown(sc); 914 } 915 916 return (0); 917 } 918 919 int 920 imxuread(dev_t dev, struct uio *uio, int flag) 921 { 922 struct imxuart_softc *sc = 923 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 924 struct tty *tp = sc->sc_tty; 925 926 if (IMXUART_ISALIVE(sc) == 0) 927 return (EIO); 928 929 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 930 } 931 932 int 933 imxuwrite(dev_t dev, struct uio *uio, int flag) 934 { 935 struct imxuart_softc *sc = 936 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 937 struct tty *tp = sc->sc_tty; 938 939 if (IMXUART_ISALIVE(sc) == 0) 940 return (EIO); 941 942 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 943 } 944 945 int 946 imxupoll(dev_t dev, int events, struct lwp *l) 947 { 948 struct imxuart_softc *sc = 949 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 950 struct tty *tp = sc->sc_tty; 951 952 if (IMXUART_ISALIVE(sc) == 0) 953 return (POLLHUP); 954 955 return ((*tp->t_linesw->l_poll)(tp, events, l)); 956 } 957 958 struct tty * 959 imxutty(dev_t dev) 960 { 961 struct imxuart_softc *sc = 962 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 963 struct tty *tp = sc->sc_tty; 964 965 return (tp); 966 } 967 968 int 969 imxuioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 970 { 971 struct imxuart_softc *sc; 972 struct tty *tp; 973 int error; 974 975 sc = device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 976 if (sc == NULL) 977 return ENXIO; 978 if (IMXUART_ISALIVE(sc) == 0) 979 return (EIO); 980 981 tp = sc->sc_tty; 982 983 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 984 if (error != EPASSTHROUGH) 985 return (error); 986 987 error = ttioctl(tp, cmd, data, flag, l); 988 if (error != EPASSTHROUGH) 989 return (error); 990 991 error = 0; 992 switch (cmd) { 993 case TIOCSFLAGS: 994 error = kauth_authorize_device_tty(l->l_cred, 995 KAUTH_DEVICE_TTY_PRIVSET, tp); 996 break; 997 default: 998 /* nothing */ 999 break; 1000 } 1001 if (error) { 1002 return error; 1003 } 1004 1005 mutex_spin_enter(&sc->sc_lock); 1006 1007 switch (cmd) { 1008 case TIOCSBRK: 1009 imxuart_break(sc, true); 1010 break; 1011 1012 case TIOCCBRK: 1013 imxuart_break(sc, false); 1014 break; 1015 1016 case TIOCSDTR: 1017 imxuart_modem(sc, 1); 1018 break; 1019 1020 case TIOCCDTR: 1021 imxuart_modem(sc, 0); 1022 break; 1023 1024 case TIOCGFLAGS: 1025 *(int *)data = sc->sc_swflags; 1026 break; 1027 1028 case TIOCSFLAGS: 1029 sc->sc_swflags = *(int *)data; 1030 break; 1031 1032 case TIOCMSET: 1033 case TIOCMBIS: 1034 case TIOCMBIC: 1035 tiocm_to_imxu(sc, cmd, *(int *)data); 1036 break; 1037 1038 case TIOCMGET: 1039 *(int *)data = imxuart_to_tiocm(sc); 1040 break; 1041 1042 #ifdef notyet 1043 case PPS_IOC_CREATE: 1044 case PPS_IOC_DESTROY: 1045 case PPS_IOC_GETPARAMS: 1046 case PPS_IOC_SETPARAMS: 1047 case PPS_IOC_GETCAP: 1048 case PPS_IOC_FETCH: 1049 #ifdef PPS_SYNC 1050 case PPS_IOC_KCBIND: 1051 #endif 1052 mutex_spin_enter(&timecounter_lock); 1053 error = pps_ioctl(cmd, data, &sc->sc_pps_state); 1054 mutex_spin_exit(&timecounter_lock); 1055 break; 1056 1057 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1058 mutex_spin_enter(&timecounter_lock); 1059 #ifndef PPS_TRAILING_EDGE 1060 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1061 &sc->sc_pps_state.ppsinfo.assert_timestamp); 1062 #else 1063 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1064 &sc->sc_pps_state.ppsinfo.clear_timestamp); 1065 #endif 1066 mutex_spin_exit(&timecounter_lock); 1067 break; 1068 #endif 1069 1070 default: 1071 error = EPASSTHROUGH; 1072 break; 1073 } 1074 1075 mutex_spin_exit(&sc->sc_lock); 1076 1077 #ifdef IMXUART_DEBUG 1078 if (imxuart_debug) 1079 imxustatus(sc, "imxuioctl "); 1080 #endif 1081 1082 return (error); 1083 } 1084 1085 integrate void 1086 imxuart_schedrx(struct imxuart_softc *sc) 1087 { 1088 sc->sc_rx_ready = 1; 1089 1090 /* Wake up the poller. */ 1091 softint_schedule(sc->sc_si); 1092 } 1093 1094 void 1095 imxuart_break(struct imxuart_softc *sc, bool onoff) 1096 { 1097 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1098 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1099 1100 if (onoff) 1101 SET(sc->sc_ucr1, IMX_UCR1_SNDBRK); 1102 else 1103 CLR(sc->sc_ucr1, IMX_UCR1_SNDBRK); 1104 1105 bus_space_write_4(iot, ioh, IMX_UCR1, sc->sc_ucr1); 1106 } 1107 1108 void 1109 imxuart_modem(struct imxuart_softc *sc, int onoff) 1110 { 1111 #ifdef notyet 1112 if (sc->sc_mcr_dtr == 0) 1113 return; 1114 1115 if (onoff) 1116 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1117 else 1118 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1119 1120 if (!sc->sc_heldchange) { 1121 if (sc->sc_tx_busy) { 1122 sc->sc_heldtbc = sc->sc_tbc; 1123 sc->sc_tbc = 0; 1124 sc->sc_heldchange = 1; 1125 } else 1126 imxuart_loadchannelregs(sc); 1127 } 1128 #endif 1129 } 1130 1131 /* 1132 * RTS output is controlled by UCR2.CTS bit. 1133 * DTR output is controlled by UCR3.DSR bit. 1134 * (i.MX reference manual uses names in DCE mode) 1135 * 1136 * note: if UCR2.CTSC == 1 for automatic HW flow control, UCR2.CTS is ignored. 1137 */ 1138 void 1139 tiocm_to_imxu(struct imxuart_softc *sc, u_long how, int ttybits) 1140 { 1141 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1142 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1143 1144 uint32_t ucr2 = sc->sc_ucr2_d; 1145 uint32_t ucr3 = sc->sc_ucr3; 1146 1147 uint32_t ucr2_mask = 0; 1148 uint32_t ucr3_mask = 0; 1149 1150 1151 if (ISSET(ttybits, TIOCM_DTR)) 1152 ucr3_mask = IMX_UCR3_DSR; 1153 if (ISSET(ttybits, TIOCM_RTS)) 1154 ucr2_mask = IMX_UCR2_CTS; 1155 1156 switch (how) { 1157 case TIOCMBIC: 1158 CLR(ucr2, ucr2_mask); 1159 CLR(ucr3, ucr3_mask); 1160 break; 1161 1162 case TIOCMBIS: 1163 SET(ucr2, ucr2_mask); 1164 SET(ucr3, ucr3_mask); 1165 break; 1166 1167 case TIOCMSET: 1168 CLR(ucr2, ucr2_mask); 1169 CLR(ucr3, ucr3_mask); 1170 SET(ucr2, ucr2_mask); 1171 SET(ucr3, ucr3_mask); 1172 break; 1173 } 1174 1175 if (ucr3 != sc->sc_ucr3) { 1176 bus_space_write_4(iot, ioh, IMX_UCR3, ucr3); 1177 sc->sc_ucr3 = ucr3; 1178 } 1179 1180 if (ucr2 == sc->sc_ucr2_d) 1181 return; 1182 1183 sc->sc_ucr2_d = ucr2; 1184 /* update CTS bit only */ 1185 ucr2 = (sc->sc_ucr2 & ~IMX_UCR2_CTS) | 1186 (ucr2 & IMX_UCR2_CTS); 1187 1188 bus_space_write_4(iot, ioh, IMX_UCR2, ucr2); 1189 sc->sc_ucr2 = ucr2; 1190 } 1191 1192 int 1193 imxuart_to_tiocm(struct imxuart_softc *sc) 1194 { 1195 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1196 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1197 int ttybits = 0; 1198 uint32_t usr[2]; 1199 1200 if (ISSET(sc->sc_ucr3, IMX_UCR3_DSR)) 1201 SET(ttybits, TIOCM_DTR); 1202 if (ISSET(sc->sc_ucr2, IMX_UCR2_CTS)) 1203 SET(ttybits, TIOCM_RTS); 1204 1205 bus_space_read_region_4(iot, ioh, IMX_USR1, usr, 2); 1206 1207 if (ISSET(usr[0], IMX_USR1_RTSS)) 1208 SET(ttybits, TIOCM_CTS); 1209 1210 if (ISSET(usr[1], IMX_USR2_DCDIN)) 1211 SET(ttybits, TIOCM_CD); 1212 1213 #if 0 1214 /* XXXbsh: I couldn't find the way to read ipp_uart_dsr_dte_i signal, 1215 although there are bits in UART registers to detect delta of DSR. 1216 */ 1217 if (ISSET(imxubits, MSR_DSR)) 1218 SET(ttybits, TIOCM_DSR); 1219 #endif 1220 1221 if (ISSET(usr[1], IMX_USR2_RIIN)) 1222 SET(ttybits, TIOCM_RI); 1223 1224 1225 #ifdef notyet 1226 if (ISSET(sc->sc_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC)) 1227 SET(ttybits, TIOCM_LE); 1228 #endif 1229 1230 return (ttybits); 1231 } 1232 1233 static uint32_t 1234 cflag_to_ucr2(tcflag_t cflag, uint32_t oldval) 1235 { 1236 uint32_t val = oldval; 1237 1238 CLR(val,IMX_UCR2_WS|IMX_UCR2_PREN|IMX_UCR2_PROE|IMX_UCR2_STPB); 1239 1240 switch (cflag & CSIZE) { 1241 case CS5: 1242 case CS6: 1243 /* not suppreted. use 7-bits */ 1244 case CS7: 1245 break; 1246 case CS8: 1247 SET(val, IMX_UCR2_WS); 1248 break; 1249 } 1250 1251 1252 if (ISSET(cflag, PARENB)) { 1253 SET(val, IMX_UCR2_PREN); 1254 1255 /* odd parity */ 1256 if (!ISSET(cflag, PARODD)) 1257 SET(val, IMX_UCR2_PROE); 1258 } 1259 1260 if (ISSET(cflag, CSTOPB)) 1261 SET(val, IMX_UCR2_STPB); 1262 1263 val |= IMX_UCR2_TXEN| IMX_UCR2_RXEN|IMX_UCR2_SRST; 1264 1265 return val; 1266 } 1267 1268 int 1269 imxuparam(struct tty *tp, struct termios *t) 1270 { 1271 struct imxuart_softc *sc = 1272 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1273 struct imxuart_baudrate_ratio ratio; 1274 uint32_t ucr2; 1275 bool change_speed = tp->t_ospeed != t->c_ospeed; 1276 1277 if (IMXUART_ISALIVE(sc) == 0) 1278 return (EIO); 1279 1280 /* Check requested parameters. */ 1281 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1282 return (EINVAL); 1283 1284 /* 1285 * For the console, always force CLOCAL and !HUPCL, so that the port 1286 * is always active. 1287 */ 1288 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1289 ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 1290 SET(t->c_cflag, CLOCAL); 1291 CLR(t->c_cflag, HUPCL); 1292 } 1293 1294 /* 1295 * If there were no changes, don't do anything. This avoids dropping 1296 * input and improves performance when all we did was frob things like 1297 * VMIN and VTIME. 1298 */ 1299 if ( !change_speed && tp->t_cflag == t->c_cflag) 1300 return (0); 1301 1302 if (change_speed) { 1303 /* calculate baudrate modulator value */ 1304 if (imxuspeed(t->c_ospeed, &ratio) < 0) 1305 return (EINVAL); 1306 sc->sc_ratio = ratio; 1307 } 1308 1309 ucr2 = cflag_to_ucr2(t->c_cflag, sc->sc_ucr2_d); 1310 1311 mutex_spin_enter(&sc->sc_lock); 1312 1313 #if 0 /* flow control stuff. not yet */ 1314 /* 1315 * If we're not in a mode that assumes a connection is present, then 1316 * ignore carrier changes. 1317 */ 1318 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1319 sc->sc_msr_dcd = 0; 1320 else 1321 sc->sc_msr_dcd = MSR_DCD; 1322 /* 1323 * Set the flow control pins depending on the current flow control 1324 * mode. 1325 */ 1326 if (ISSET(t->c_cflag, CRTSCTS)) { 1327 sc->sc_mcr_dtr = MCR_DTR; 1328 sc->sc_mcr_rts = MCR_RTS; 1329 sc->sc_msr_cts = MSR_CTS; 1330 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1331 } else if (ISSET(t->c_cflag, MDMBUF)) { 1332 /* 1333 * For DTR/DCD flow control, make sure we don't toggle DTR for 1334 * carrier detection. 1335 */ 1336 sc->sc_mcr_dtr = 0; 1337 sc->sc_mcr_rts = MCR_DTR; 1338 sc->sc_msr_cts = MSR_DCD; 1339 sc->sc_efr = 0; 1340 } else { 1341 /* 1342 * If no flow control, then always set RTS. This will make 1343 * the other side happy if it mistakenly thinks we're doing 1344 * RTS/CTS flow control. 1345 */ 1346 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1347 sc->sc_mcr_rts = 0; 1348 sc->sc_msr_cts = 0; 1349 sc->sc_efr = 0; 1350 if (ISSET(sc->sc_mcr, MCR_DTR)) 1351 SET(sc->sc_mcr, MCR_RTS); 1352 else 1353 CLR(sc->sc_mcr, MCR_RTS); 1354 } 1355 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1356 #endif 1357 1358 /* And copy to tty. */ 1359 tp->t_ispeed = t->c_ospeed; 1360 tp->t_ospeed = t->c_ospeed; 1361 tp->t_cflag = t->c_cflag; 1362 1363 if (!change_speed && ucr2 == sc->sc_ucr2_d) { 1364 /* noop */ 1365 } 1366 else if (!sc->sc_pending && !sc->sc_tx_busy) { 1367 if (ucr2 != sc->sc_ucr2_d) { 1368 sc->sc_ucr2_d = ucr2; 1369 imxuart_load_params(sc); 1370 } 1371 if (change_speed) 1372 imxuart_load_speed(sc); 1373 } 1374 else { 1375 if (!sc->sc_pending) { 1376 sc->sc_heldtbc = sc->sc_tbc; 1377 sc->sc_tbc = 0; 1378 } 1379 sc->sc_pending |= 1380 (ucr2 == sc->sc_ucr2_d ? 0 : IMXUART_PEND_PARAM) | 1381 (change_speed ? 0 : IMXUART_PEND_SPEED); 1382 sc->sc_ucr2_d = ucr2; 1383 } 1384 1385 if (!ISSET(t->c_cflag, CHWFLOW)) { 1386 /* Disable the high water mark. */ 1387 sc->sc_r_hiwat = 0; 1388 sc->sc_r_lowat = 0; 1389 if (ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED)) { 1390 CLR(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED); 1391 imxuart_schedrx(sc); 1392 } 1393 if (ISSET(sc->sc_rx_flags, 1394 IMXUART_RX_TTY_BLOCKED|IMXUART_RX_IBUF_BLOCKED)) { 1395 CLR(sc->sc_rx_flags, 1396 IMXUART_RX_TTY_BLOCKED|IMXUART_RX_IBUF_BLOCKED); 1397 imxuart_hwiflow(sc); 1398 } 1399 } else { 1400 sc->sc_r_hiwat = imxuart_rbuf_hiwat; 1401 sc->sc_r_lowat = imxuart_rbuf_lowat; 1402 } 1403 1404 mutex_spin_exit(&sc->sc_lock); 1405 1406 #if 0 1407 /* 1408 * Update the tty layer's idea of the carrier bit, in case we changed 1409 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1410 * explicit request. 1411 */ 1412 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1413 #else 1414 /* XXX: always report that we have DCD */ 1415 (void) (*tp->t_linesw->l_modem)(tp, 1); 1416 #endif 1417 1418 #ifdef IMXUART_DEBUG 1419 if (imxuart_debug) 1420 imxustatus(sc, "imxuparam "); 1421 #endif 1422 1423 if (!ISSET(t->c_cflag, CHWFLOW)) { 1424 if (sc->sc_tx_stopped) { 1425 sc->sc_tx_stopped = 0; 1426 imxustart(tp); 1427 } 1428 } 1429 1430 return (0); 1431 } 1432 1433 void 1434 imxuart_iflush(struct imxuart_softc *sc) 1435 { 1436 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1437 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1438 #ifdef DIAGNOSTIC 1439 uint32_t reg = 0xffff; 1440 #endif 1441 int timo; 1442 1443 timo = 50000; 1444 /* flush any pending I/O */ 1445 while (ISSET(bus_space_read_4(iot, ioh, IMX_USR2), IMX_USR2_RDR) 1446 && --timo) 1447 #ifdef DIAGNOSTIC 1448 reg = 1449 #else 1450 (void) 1451 #endif 1452 bus_space_read_4(iot, ioh, IMX_URXD); 1453 #ifdef DIAGNOSTIC 1454 if (!timo) 1455 aprint_error_dev(sc->sc_dev, "imxuart_iflush timeout %02x\n", reg); 1456 #endif 1457 } 1458 1459 int 1460 imxuhwiflow(struct tty *tp, int block) 1461 { 1462 struct imxuart_softc *sc = 1463 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1464 1465 if (IMXUART_ISALIVE(sc) == 0) 1466 return (0); 1467 1468 #ifdef notyet 1469 if (sc->sc_mcr_rts == 0) 1470 return (0); 1471 #endif 1472 1473 mutex_spin_enter(&sc->sc_lock); 1474 1475 if (block) { 1476 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED)) { 1477 SET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED); 1478 imxuart_hwiflow(sc); 1479 } 1480 } else { 1481 if (ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED)) { 1482 CLR(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED); 1483 imxuart_schedrx(sc); 1484 } 1485 if (ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED)) { 1486 CLR(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED); 1487 imxuart_hwiflow(sc); 1488 } 1489 } 1490 1491 mutex_spin_exit(&sc->sc_lock); 1492 return (1); 1493 } 1494 1495 /* 1496 * (un)block input via hw flowcontrol 1497 */ 1498 void 1499 imxuart_hwiflow(struct imxuart_softc *sc) 1500 { 1501 #ifdef notyet 1502 struct imxuart_regs *regsp= &sc->sc_regs; 1503 1504 if (sc->sc_mcr_rts == 0) 1505 return; 1506 1507 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1508 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1509 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1510 } else { 1511 SET(sc->sc_mcr, sc->sc_mcr_rts); 1512 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1513 } 1514 UR_WRITE_1(regsp, IMXUART_REG_MCR, sc->sc_mcr_active); 1515 #endif 1516 } 1517 1518 1519 void 1520 imxustart(struct tty *tp) 1521 { 1522 struct imxuart_softc *sc = 1523 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1524 int s; 1525 u_char *tba; 1526 int tbc; 1527 u_int n; 1528 u_int space; 1529 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1530 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1531 1532 if (IMXUART_ISALIVE(sc) == 0) 1533 return; 1534 1535 s = spltty(); 1536 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1537 goto out; 1538 if (sc->sc_tx_stopped) 1539 goto out; 1540 if (!ttypull(tp)) 1541 goto out; 1542 1543 /* Grab the first contiguous region of buffer space. */ 1544 tba = tp->t_outq.c_cf; 1545 tbc = ndqb(&tp->t_outq, 0); 1546 1547 mutex_spin_enter(&sc->sc_lock); 1548 1549 sc->sc_tba = tba; 1550 sc->sc_tbc = tbc; 1551 1552 SET(tp->t_state, TS_BUSY); 1553 sc->sc_tx_busy = 1; 1554 1555 space = imxuart_txfifo_space(sc); 1556 n = MIN(sc->sc_tbc, space); 1557 1558 bus_space_write_multi_1(iot, ioh, IMX_UTXD, sc->sc_tba, n); 1559 sc->sc_tbc -= n; 1560 sc->sc_tba += n; 1561 1562 /* Enable transmit completion interrupts */ 1563 imxuart_control_txint(sc, true); 1564 1565 mutex_spin_exit(&sc->sc_lock); 1566 out: 1567 splx(s); 1568 return; 1569 } 1570 1571 /* 1572 * Stop output on a line. 1573 */ 1574 void 1575 imxustop(struct tty *tp, int flag) 1576 { 1577 struct imxuart_softc *sc = 1578 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1579 1580 mutex_spin_enter(&sc->sc_lock); 1581 if (ISSET(tp->t_state, TS_BUSY)) { 1582 /* Stop transmitting at the next chunk. */ 1583 sc->sc_tbc = 0; 1584 sc->sc_heldtbc = 0; 1585 if (!ISSET(tp->t_state, TS_TTSTOP)) 1586 SET(tp->t_state, TS_FLUSH); 1587 } 1588 mutex_spin_exit(&sc->sc_lock); 1589 } 1590 1591 void 1592 imxudiag(void *arg) 1593 { 1594 #ifdef notyet 1595 struct imxuart_softc *sc = arg; 1596 int overflows, floods; 1597 1598 mutex_spin_enter(&sc->sc_lock); 1599 overflows = sc->sc_overflows; 1600 sc->sc_overflows = 0; 1601 floods = sc->sc_floods; 1602 sc->sc_floods = 0; 1603 sc->sc_errors = 0; 1604 mutex_spin_exit(&sc->sc_lock); 1605 1606 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1607 device_xname(sc->sc_dev), 1608 overflows, overflows == 1 ? "" : "s", 1609 floods, floods == 1 ? "" : "s"); 1610 #endif 1611 } 1612 1613 integrate void 1614 imxuart_rxsoft(struct imxuart_softc *sc, struct tty *tp) 1615 { 1616 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1617 u_int cc, scc, outp; 1618 uint16_t data; 1619 u_int code; 1620 1621 scc = cc = IMXUART_RBUF_AVAIL(sc); 1622 1623 #if 0 1624 if (cc == imxuart_rbuf_size-1) { 1625 sc->sc_floods++; 1626 if (sc->sc_errors++ == 0) 1627 callout_reset(&sc->sc_diag_callout, 60 * hz, 1628 imxudiag, sc); 1629 } 1630 #endif 1631 1632 /* If not yet open, drop the entire buffer content here */ 1633 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1634 sc->sc_rbuf_out = sc->sc_rbuf_in; 1635 cc = 0; 1636 } 1637 1638 outp = sc->sc_rbuf_out; 1639 1640 #define ERRBITS (IMX_URXD_PRERR|IMX_URXD_BRK|IMX_URXD_FRMERR|IMX_URXD_OVRRUN) 1641 1642 while (cc) { 1643 data = sc->sc_rbuf[outp]; 1644 code = data & IMX_URXD_RX_DATA; 1645 if (ISSET(data, ERRBITS)) { 1646 if (sc->sc_errors.err == 0) 1647 callout_reset(&sc->sc_diag_callout, 1648 60 * hz, imxudiag, sc); 1649 if (ISSET(data, IMX_URXD_OVRRUN)) 1650 sc->sc_errors.ovrrun++; 1651 if (ISSET(data, IMX_URXD_BRK)) { 1652 sc->sc_errors.brk++; 1653 SET(code, TTY_FE); 1654 } 1655 if (ISSET(data, IMX_URXD_FRMERR)) { 1656 sc->sc_errors.frmerr++; 1657 SET(code, TTY_FE); 1658 } 1659 if (ISSET(data, IMX_URXD_PRERR)) { 1660 sc->sc_errors.prerr++; 1661 SET(code, TTY_PE); 1662 } 1663 } 1664 if ((*rint)(code, tp) == -1) { 1665 /* 1666 * The line discipline's buffer is out of space. 1667 */ 1668 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED)) { 1669 /* 1670 * We're either not using flow control, or the 1671 * line discipline didn't tell us to block for 1672 * some reason. Either way, we have no way to 1673 * know when there's more space available, so 1674 * just drop the rest of the data. 1675 */ 1676 sc->sc_rbuf_out = sc->sc_rbuf_in; 1677 cc = 0; 1678 } else { 1679 /* 1680 * Don't schedule any more receive processing 1681 * until the line discipline tells us there's 1682 * space available (through imxuhwiflow()). 1683 * Leave the rest of the data in the input 1684 * buffer. 1685 */ 1686 SET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED); 1687 } 1688 break; 1689 } 1690 outp = IMXUART_RBUF_INC(sc, outp, 1); 1691 cc--; 1692 } 1693 1694 if (cc != scc) { 1695 sc->sc_rbuf_out = outp; 1696 mutex_spin_enter(&sc->sc_lock); 1697 1698 cc = IMXUART_RBUF_SPACE(sc); 1699 1700 /* Buffers should be ok again, release possible block. */ 1701 if (cc >= sc->sc_r_lowat) { 1702 if (ISSET(sc->sc_rx_flags, IMXUART_RX_IBUF_OVERFLOWED)) { 1703 CLR(sc->sc_rx_flags, IMXUART_RX_IBUF_OVERFLOWED); 1704 imxuart_control_rxint(sc, true); 1705 } 1706 if (ISSET(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED)) { 1707 CLR(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED); 1708 imxuart_hwiflow(sc); 1709 } 1710 } 1711 mutex_spin_exit(&sc->sc_lock); 1712 } 1713 } 1714 1715 integrate void 1716 imxuart_txsoft(struct imxuart_softc *sc, struct tty *tp) 1717 { 1718 1719 CLR(tp->t_state, TS_BUSY); 1720 if (ISSET(tp->t_state, TS_FLUSH)) 1721 CLR(tp->t_state, TS_FLUSH); 1722 else 1723 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1724 (*tp->t_linesw->l_start)(tp); 1725 } 1726 1727 integrate void 1728 imxuart_stsoft(struct imxuart_softc *sc, struct tty *tp) 1729 { 1730 #ifdef notyet 1731 u_char msr, delta; 1732 1733 mutex_spin_enter(&sc->sc_lock); 1734 msr = sc->sc_msr; 1735 delta = sc->sc_msr_delta; 1736 sc->sc_msr_delta = 0; 1737 mutex_spin_exit(&sc->sc_lock); 1738 1739 if (ISSET(delta, sc->sc_msr_dcd)) { 1740 /* 1741 * Inform the tty layer that carrier detect changed. 1742 */ 1743 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1744 } 1745 1746 if (ISSET(delta, sc->sc_msr_cts)) { 1747 /* Block or unblock output according to flow control. */ 1748 if (ISSET(msr, sc->sc_msr_cts)) { 1749 sc->sc_tx_stopped = 0; 1750 (*tp->t_linesw->l_start)(tp); 1751 } else { 1752 sc->sc_tx_stopped = 1; 1753 } 1754 } 1755 1756 #endif 1757 #ifdef IMXUART_DEBUG 1758 if (imxuart_debug) 1759 imxustatus(sc, "imxuart_stsoft"); 1760 #endif 1761 } 1762 1763 void 1764 imxusoft(void *arg) 1765 { 1766 struct imxuart_softc *sc = arg; 1767 struct tty *tp; 1768 1769 if (IMXUART_ISALIVE(sc) == 0) 1770 return; 1771 1772 tp = sc->sc_tty; 1773 1774 if (sc->sc_rx_ready) { 1775 sc->sc_rx_ready = 0; 1776 imxuart_rxsoft(sc, tp); 1777 } 1778 1779 if (sc->sc_st_check) { 1780 sc->sc_st_check = 0; 1781 imxuart_stsoft(sc, tp); 1782 } 1783 1784 if (sc->sc_tx_done) { 1785 sc->sc_tx_done = 0; 1786 imxuart_txsoft(sc, tp); 1787 } 1788 } 1789 1790 int 1791 imxuintr(void *arg) 1792 { 1793 struct imxuart_softc *sc = arg; 1794 uint32_t usr1, usr2; 1795 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1796 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1797 1798 1799 if (IMXUART_ISALIVE(sc) == 0) 1800 return (0); 1801 1802 mutex_spin_enter(&sc->sc_lock); 1803 1804 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1805 1806 1807 do { 1808 bus_space_write_4(iot, ioh, IMX_USR2, 1809 usr2 & (IMX_USR2_BRCD|IMX_USR2_ORE)); 1810 if (usr2 & IMX_USR2_BRCD) { 1811 /* Break signal detected */ 1812 int cn_trapped = 0; 1813 1814 cn_check_magic(sc->sc_tty->t_dev, 1815 CNC_BREAK, imxuart_cnm_state); 1816 if (cn_trapped) 1817 continue; 1818 #if defined(KGDB) && !defined(DDB) 1819 if (ISSET(sc->sc_hwflags, IMXUART_HW_KGDB)) { 1820 kgdb_connect(1); 1821 continue; 1822 } 1823 #endif 1824 } 1825 1826 if (usr2 & IMX_USR2_RDR) 1827 imxuintr_read(sc); 1828 1829 #ifdef IMXUART_PPS 1830 { 1831 u_char msr, delta; 1832 1833 msr = CSR_READ_1(regsp, IMXUART_REG_MSR); 1834 delta = msr ^ sc->sc_msr; 1835 sc->sc_msr = msr; 1836 if ((sc->sc_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) && 1837 (delta & MSR_DCD)) { 1838 mutex_spin_enter(&timecounter_lock); 1839 pps_capture(&sc->sc_pps_state); 1840 pps_event(&sc->sc_pps_state, 1841 (msr & MSR_DCD) ? 1842 PPS_CAPTUREASSERT : 1843 PPS_CAPTURECLEAR); 1844 mutex_spin_exit(&timecounter_lock); 1845 } 1846 } 1847 #endif 1848 1849 #ifdef notyet 1850 /* 1851 * Process normal status changes 1852 */ 1853 if (ISSET(delta, sc->sc_msr_mask)) { 1854 SET(sc->sc_msr_delta, delta); 1855 1856 /* 1857 * Stop output immediately if we lose the output 1858 * flow control signal or carrier detect. 1859 */ 1860 if (ISSET(~msr, sc->sc_msr_mask)) { 1861 sc->sc_tbc = 0; 1862 sc->sc_heldtbc = 0; 1863 #ifdef IMXUART_DEBUG 1864 if (imxuart_debug) 1865 imxustatus(sc, "imxuintr "); 1866 #endif 1867 } 1868 1869 sc->sc_st_check = 1; 1870 } 1871 #endif 1872 1873 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1874 } while (usr2 & (IMX_USR2_RDR|IMX_USR2_BRCD)); 1875 1876 usr1 = bus_space_read_4(iot, ioh, IMX_USR1); 1877 if (usr1 & IMX_USR1_TRDY) 1878 imxuintr_send(sc); 1879 1880 mutex_spin_exit(&sc->sc_lock); 1881 1882 /* Wake up the poller. */ 1883 softint_schedule(sc->sc_si); 1884 1885 #ifdef RND_COM 1886 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1887 #endif 1888 1889 return (1); 1890 } 1891 1892 1893 /* 1894 * called when there is least one character in rxfifo 1895 * 1896 */ 1897 1898 static void 1899 imxuintr_read(struct imxuart_softc *sc) 1900 { 1901 int cc; 1902 uint16_t rd; 1903 uint32_t usr2; 1904 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1905 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1906 1907 cc = IMXUART_RBUF_SPACE(sc); 1908 1909 /* clear aging timer interrupt */ 1910 bus_space_write_4(iot, ioh, IMX_USR1, IMX_USR1_AGTIM); 1911 1912 while (cc > 0) { 1913 int cn_trapped = 0; 1914 1915 1916 sc->sc_rbuf[sc->sc_rbuf_in] = rd = 1917 bus_space_read_4(iot, ioh, IMX_URXD); 1918 1919 cn_check_magic(sc->sc_tty->t_dev, 1920 rd & 0xff, imxuart_cnm_state); 1921 1922 if (!cn_trapped) { 1923 sc->sc_rbuf_in = IMXUART_RBUF_INC(sc, sc->sc_rbuf_in, 1); 1924 cc--; 1925 } 1926 1927 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1928 if (!(usr2 & IMX_USR2_RDR)) 1929 break; 1930 } 1931 1932 /* 1933 * Current string of incoming characters ended because 1934 * no more data was available or we ran out of space. 1935 * Schedule a receive event if any data was received. 1936 * If we're out of space, turn off receive interrupts. 1937 */ 1938 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED)) 1939 sc->sc_rx_ready = 1; 1940 /* 1941 * See if we are in danger of overflowing a buffer. If 1942 * so, use hardware flow control to ease the pressure. 1943 */ 1944 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED) && 1945 cc < sc->sc_r_hiwat) { 1946 sc->sc_rx_flags |= IMXUART_RX_IBUF_BLOCKED; 1947 imxuart_hwiflow(sc); 1948 } 1949 1950 /* 1951 * If we're out of space, disable receive interrupts 1952 * until the queue has drained a bit. 1953 */ 1954 if (!cc) { 1955 sc->sc_rx_flags |= IMXUART_RX_IBUF_OVERFLOWED; 1956 imxuart_control_rxint(sc, false); 1957 } 1958 } 1959 1960 1961 1962 /* 1963 * find how many chars we can put into tx-fifo 1964 */ 1965 static u_int 1966 imxuart_txfifo_space(struct imxuart_softc *sc) 1967 { 1968 uint32_t usr1, usr2; 1969 u_int cc; 1970 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1971 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1972 1973 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1974 if (usr2 & IMX_USR2_TXFE) 1975 cc = sc->sc_txfifo_len; 1976 else { 1977 usr1 = bus_space_read_4(iot, ioh, IMX_USR1); 1978 if (usr1 & IMX_USR1_TRDY) 1979 cc = sc->sc_txfifo_thresh; 1980 else 1981 cc = 0; 1982 } 1983 1984 return cc; 1985 } 1986 1987 void 1988 imxuintr_send(struct imxuart_softc *sc) 1989 { 1990 uint32_t usr2; 1991 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1992 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1993 int cc = 0; 1994 1995 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1996 1997 if (sc->sc_pending) { 1998 if (usr2 & IMX_USR2_TXFE) { 1999 imxuart_load_pendings(sc); 2000 sc->sc_tbc = sc->sc_heldtbc; 2001 sc->sc_heldtbc = 0; 2002 } 2003 else { 2004 /* wait for TX fifo empty */ 2005 imxuart_control_txint(sc, true); 2006 return; 2007 } 2008 } 2009 2010 cc = imxuart_txfifo_space(sc); 2011 cc = MIN(cc, sc->sc_tbc); 2012 2013 if (cc > 0) { 2014 bus_space_write_multi_1(iot, ioh, IMX_UTXD, sc->sc_tba, cc); 2015 sc->sc_tbc -= cc; 2016 sc->sc_tba += cc; 2017 } 2018 2019 if (sc->sc_tbc > 0) 2020 imxuart_control_txint(sc, true); 2021 else { 2022 /* no more chars to send. 2023 we don't need tx interrupt any more. */ 2024 imxuart_control_txint(sc, false); 2025 if (sc->sc_tx_busy) { 2026 sc->sc_tx_busy = 0; 2027 sc->sc_tx_done = 1; 2028 } 2029 } 2030 } 2031 2032 static void 2033 imxuart_disable_all_interrupts(struct imxuart_softc *sc) 2034 { 2035 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2036 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2037 2038 sc->sc_ucr1 &= ~IMXUART_INTRS_UCR1; 2039 sc->sc_ucr2 &= ~IMXUART_INTRS_UCR2; 2040 sc->sc_ucr3 &= ~IMXUART_INTRS_UCR3; 2041 sc->sc_ucr4 &= ~IMXUART_INTRS_UCR4; 2042 2043 2044 bus_space_write_region_4(iot, ioh, IMX_UCR1, sc->sc_ucr, 4); 2045 } 2046 2047 static void 2048 imxuart_control_rxint(struct imxuart_softc *sc, bool enable) 2049 { 2050 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2051 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2052 uint32_t ucr1, ucr2; 2053 2054 ucr1 = sc->sc_ucr1; 2055 ucr2 = sc->sc_ucr2; 2056 2057 if (enable) { 2058 ucr1 |= IMX_UCR1_RRDYEN; 2059 ucr2 |= IMX_UCR2_ATEN; 2060 } 2061 else { 2062 ucr1 &= ~IMX_UCR1_RRDYEN; 2063 ucr2 &= ~IMX_UCR2_ATEN; 2064 } 2065 2066 if (ucr1 != sc->sc_ucr1 || ucr2 != sc->sc_ucr2) { 2067 sc->sc_ucr1 = ucr1; 2068 sc->sc_ucr2 = ucr2; 2069 bus_space_write_region_4(iot, ioh, IMX_UCR1, sc->sc_ucr, 2); 2070 } 2071 } 2072 2073 static void 2074 imxuart_control_txint(struct imxuart_softc *sc, bool enable) 2075 { 2076 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2077 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2078 uint32_t ucr1; 2079 uint32_t mask; 2080 2081 /* if parameter change is pending, get interrupt when Tx fifo 2082 is completely empty. otherwise, get interrupt when txfifo 2083 has less characters than threshold */ 2084 mask = sc->sc_pending ? IMX_UCR1_TXMPTYEN : IMX_UCR1_TRDYEN; 2085 2086 ucr1 = sc->sc_ucr1; 2087 2088 CLR(ucr1, IMX_UCR1_TXMPTYEN|IMX_UCR1_TRDYEN); 2089 if (enable) 2090 SET(ucr1, mask); 2091 2092 if (ucr1 != sc->sc_ucr1) { 2093 bus_space_write_4(iot, ioh, IMX_UCR1, ucr1); 2094 sc->sc_ucr1 = ucr1; 2095 } 2096 } 2097 2098 2099 static void 2100 imxuart_load_params(struct imxuart_softc *sc) 2101 { 2102 uint32_t ucr2; 2103 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2104 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2105 2106 ucr2 = (sc->sc_ucr2_d & ~IMX_UCR2_ATEN) | 2107 (sc->sc_ucr2 & IMX_UCR2_ATEN); 2108 2109 bus_space_write_4(iot, ioh, IMX_UCR2, ucr2); 2110 sc->sc_ucr2 = ucr2; 2111 } 2112 2113 static void 2114 imxuart_load_speed(struct imxuart_softc *sc) 2115 { 2116 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2117 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2118 int n, rfdiv, ufcr; 2119 2120 #ifdef notyet 2121 /* 2122 * Set the FIFO threshold based on the receive speed. 2123 * 2124 * * If it's a low speed, it's probably a mouse or some other 2125 * interactive device, so set the threshold low. 2126 * * If it's a high speed, trim the trigger level down to prevent 2127 * overflows. 2128 * * Otherwise set it a bit higher. 2129 */ 2130 if (t->c_ospeed <= 1200) 2131 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_1; 2132 else if (t->c_ospeed <= 38400) 2133 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_8; 2134 else 2135 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_4; 2136 #endif 2137 2138 n = 32 - sc->sc_txfifo_thresh; 2139 n = MAX(2, n); 2140 2141 rfdiv = IMX_UFCR_DIVIDER_TO_RFDIV(imxuart_freqdiv); 2142 2143 ufcr = (n << IMX_UFCR_TXTL_SHIFT) | 2144 (rfdiv << IMX_UFCR_RFDIV_SHIFT) | 2145 (16 << IMX_UFCR_RXTL_SHIFT); 2146 2147 /* keep DCE/DTE bit */ 2148 ufcr |= bus_space_read_4(iot, ioh, IMX_UFCR) & IMX_UFCR_DCEDTE; 2149 2150 bus_space_write_4(iot, ioh, IMX_UFCR, ufcr); 2151 2152 /* UBIR must updated before UBMR */ 2153 bus_space_write_4(iot, ioh, 2154 IMX_UBIR, sc->sc_ratio.numerator); 2155 bus_space_write_4(iot, ioh, 2156 IMX_UBMR, sc->sc_ratio.modulator); 2157 2158 2159 } 2160 2161 2162 static void 2163 imxuart_load_pendings(struct imxuart_softc *sc) 2164 { 2165 if (sc->sc_pending & IMXUART_PEND_PARAM) 2166 imxuart_load_params(sc); 2167 if (sc->sc_pending & IMXUART_PEND_SPEED) 2168 imxuart_load_speed(sc); 2169 sc->sc_pending = 0; 2170 } 2171 2172 #if defined(IMXUARTCONSOLE) || defined(KGDB) 2173 2174 /* 2175 * The following functions are polled getc and putc routines, shared 2176 * by the console and kgdb glue. 2177 * 2178 * The read-ahead code is so that you can detect pending in-band 2179 * cn_magic in polled mode while doing output rather than having to 2180 * wait until the kernel decides it needs input. 2181 */ 2182 2183 #define READAHEAD_RING_LEN 16 2184 static int imxuart_readahead[READAHEAD_RING_LEN]; 2185 static int imxuart_readahead_in = 0; 2186 static int imxuart_readahead_out = 0; 2187 #define READAHEAD_IS_EMPTY() (imxuart_readahead_in==imxuart_readahead_out) 2188 #define READAHEAD_IS_FULL() \ 2189 (((imxuart_readahead_in+1) & (READAHEAD_RING_LEN-1)) ==imxuart_readahead_out) 2190 2191 int 2192 imxuart_common_getc(dev_t dev, struct imxuart_regs *regsp) 2193 { 2194 int s = splserial(); 2195 u_char c; 2196 bus_space_tag_t iot = regsp->ur_iot; 2197 bus_space_handle_t ioh = regsp->ur_ioh; 2198 uint32_t usr2; 2199 2200 /* got a character from reading things earlier */ 2201 if (imxuart_readahead_in != imxuart_readahead_out) { 2202 2203 c = imxuart_readahead[imxuart_readahead_out]; 2204 imxuart_readahead_out = (imxuart_readahead_out + 1) & 2205 (READAHEAD_RING_LEN-1); 2206 splx(s); 2207 return (c); 2208 } 2209 2210 /* block until a character becomes available */ 2211 while (!((usr2 = bus_space_read_4(iot, ioh, IMX_USR2)) & IMX_USR2_RDR)) 2212 ; 2213 2214 c = 0xff & bus_space_read_4(iot, ioh, IMX_URXD); 2215 2216 { 2217 int cn_trapped = 0; /* unused */ 2218 #ifdef DDB 2219 extern int db_active; 2220 if (!db_active) 2221 #endif 2222 cn_check_magic(dev, c, imxuart_cnm_state); 2223 } 2224 splx(s); 2225 return (c); 2226 } 2227 2228 void 2229 imxuart_common_putc(dev_t dev, struct imxuart_regs *regsp, int c) 2230 { 2231 int s = splserial(); 2232 int cin, timo; 2233 bus_space_tag_t iot = regsp->ur_iot; 2234 bus_space_handle_t ioh = regsp->ur_ioh; 2235 uint32_t usr2; 2236 2237 if (!READAHEAD_IS_FULL() && 2238 ((usr2 = bus_space_read_4(iot, ioh, IMX_USR2)) & IMX_USR2_RDR)) { 2239 2240 int cn_trapped = 0; 2241 cin = bus_space_read_4(iot, ioh, IMX_URXD); 2242 cn_check_magic(dev, cin & 0xff, imxuart_cnm_state); 2243 imxuart_readahead_in = (imxuart_readahead_in + 1) & 2244 (READAHEAD_RING_LEN-1); 2245 } 2246 2247 /* wait for any pending transmission to finish */ 2248 timo = 150000; 2249 do { 2250 if (bus_space_read_4(iot, ioh, IMX_USR1) & IMX_USR1_TRDY) { 2251 bus_space_write_4(iot, ioh, IMX_UTXD, c); 2252 break; 2253 } 2254 } while(--timo > 0); 2255 2256 IMXUART_BARRIER(regsp, BR | BW); 2257 2258 splx(s); 2259 } 2260 2261 /* 2262 * Initialize UART for use as console or KGDB line. 2263 */ 2264 int 2265 imxuart_init(struct imxuart_regs *regsp, int rate, tcflag_t cflag) 2266 { 2267 struct imxuart_baudrate_ratio ratio; 2268 int rfdiv = IMX_UFCR_DIVIDER_TO_RFDIV(imxuart_freqdiv); 2269 uint32_t ufcr; 2270 2271 if (bus_space_map(regsp->ur_iot, regsp->ur_iobase, IMX_UART_SIZE, 0, 2272 ®sp->ur_ioh)) 2273 return ENOMEM; /* ??? */ 2274 2275 if (imxuspeed(rate, &ratio) < 0) 2276 return EINVAL; 2277 2278 /* UBIR must updated before UBMR */ 2279 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, 2280 IMX_UBIR, ratio.numerator); 2281 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, 2282 IMX_UBMR, ratio.modulator); 2283 2284 2285 /* XXX: DTREN, DPEC */ 2286 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR3, 2287 IMX_UCR3_DSR|IMX_UCR3_RXDMUXSEL); 2288 2289 ufcr = (8 << IMX_UFCR_TXTL_SHIFT) | (rfdiv << IMX_UFCR_RFDIV_SHIFT) | 2290 (1 << IMX_UFCR_RXTL_SHIFT); 2291 /* XXX: keep DCE/DTE bit */ 2292 ufcr |= bus_space_read_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR) & 2293 IMX_UFCR_DCEDTE; 2294 2295 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR, ufcr); 2296 2297 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_ONEMS, 2298 imxuart_freq / imxuart_freqdiv / 1000); 2299 2300 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR2, 2301 IMX_UCR2_IRTS| 2302 IMX_UCR2_CTSC| 2303 IMX_UCR2_WS|IMX_UCR2_TXEN| 2304 IMX_UCR2_RXEN|IMX_UCR2_SRST); 2305 /* clear status registers */ 2306 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_USR1, 0xffff); 2307 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_USR2, 0xffff); 2308 2309 2310 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR1, 2311 IMX_UCR1_UARTEN); 2312 2313 return (0); 2314 } 2315 2316 2317 #endif 2318 2319 2320 #ifdef IMXUARTCONSOLE 2321 /* 2322 * Following are all routines needed for UART to act as console 2323 */ 2324 struct consdev imxucons = { 2325 NULL, NULL, imxucngetc, imxucnputc, imxucnpollc, NULL, NULL, NULL, 2326 NODEV, CN_NORMAL 2327 }; 2328 2329 2330 int 2331 imxuart_cons_attach(bus_space_tag_t iot, paddr_t iobase, u_int rate, 2332 tcflag_t cflag) 2333 { 2334 struct imxuart_regs regs; 2335 int res; 2336 2337 regs.ur_iot = iot; 2338 regs.ur_iobase = iobase; 2339 2340 res = imxuart_init(®s, rate, cflag); 2341 if (res) 2342 return (res); 2343 2344 cn_tab = &imxucons; 2345 cn_init_magic(&imxuart_cnm_state); 2346 cn_set_magic("\047\001"); /* default magic is BREAK */ 2347 2348 imxuconsrate = rate; 2349 imxuconscflag = cflag; 2350 2351 imxuconsregs = regs; 2352 2353 return 0; 2354 } 2355 2356 int 2357 imxucngetc(dev_t dev) 2358 { 2359 return (imxuart_common_getc(dev, &imxuconsregs)); 2360 } 2361 2362 /* 2363 * Console kernel output character routine. 2364 */ 2365 void 2366 imxucnputc(dev_t dev, int c) 2367 { 2368 imxuart_common_putc(dev, &imxuconsregs, c); 2369 } 2370 2371 void 2372 imxucnpollc(dev_t dev, int on) 2373 { 2374 2375 } 2376 2377 #endif /* IMXUARTCONSOLE */ 2378 2379 #ifdef KGDB 2380 int 2381 imxuart_kgdb_attach(bus_space_tag_t iot, paddr_t iobase, u_int rate, 2382 tcflag_t cflag) 2383 { 2384 int res; 2385 2386 if (iot == imxuconsregs.ur_iot && 2387 iobase == imxuconsregs.ur_iobase) { 2388 #if !defined(DDB) 2389 return (EBUSY); /* cannot share with console */ 2390 #else 2391 imxu_kgdb_regs.ur_iot = iot; 2392 imxu_kgdb_regs.ur_ioh = imxuconsregs.ur_ioh; 2393 imxu_kgdb_regs.ur_iobase = iobase; 2394 #endif 2395 } else { 2396 imxu_kgdb_regs.ur_iot = iot; 2397 imxu_kgdb_regs.ur_iobase = iobase; 2398 2399 res = imxuart_init(&imxu_kgdb_regs, rate, cflag); 2400 if (res) 2401 return (res); 2402 2403 /* 2404 * XXXfvdl this shouldn't be needed, but the cn_magic goo 2405 * expects this to be initialized 2406 */ 2407 cn_init_magic(&imxuart_cnm_state); 2408 cn_set_magic("\047\001"); 2409 } 2410 2411 kgdb_attach(imxuart_kgdb_getc, imxuart_kgdb_putc, &imxu_kgdb_regs); 2412 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2413 2414 return (0); 2415 } 2416 2417 /* ARGSUSED */ 2418 int 2419 imxuart_kgdb_getc(void *arg) 2420 { 2421 struct imxuart_regs *regs = arg; 2422 2423 return (imxuart_common_getc(NODEV, regs)); 2424 } 2425 2426 /* ARGSUSED */ 2427 void 2428 imxuart_kgdb_putc(void *arg, int c) 2429 { 2430 struct imxuart_regs *regs = arg; 2431 2432 imxuart_common_putc(NODEV, regs, c); 2433 } 2434 #endif /* KGDB */ 2435 2436 /* helper function to identify the imxu ports used by 2437 console or KGDB (and not yet autoconf attached) */ 2438 int 2439 imxuart_is_console(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t *ioh) 2440 { 2441 bus_space_handle_t help; 2442 2443 if (!imxuconsattached && 2444 iot == imxuconsregs.ur_iot && iobase == imxuconsregs.ur_iobase) 2445 help = imxuconsregs.ur_ioh; 2446 #ifdef KGDB 2447 else if (!imxu_kgdb_attached && 2448 iot == imxu_kgdb_regs.ur_iot && iobase == imxu_kgdb_regs.ur_iobase) 2449 help = imxu_kgdb_regs.ur_ioh; 2450 #endif 2451 else 2452 return (0); 2453 2454 if (ioh) 2455 *ioh = help; 2456 return (1); 2457 } 2458 2459 #ifdef notyet 2460 2461 bool 2462 imxuart_cleanup(device_t self, int how) 2463 { 2464 /* 2465 * this routine exists to serve as a shutdown hook for systems that 2466 * have firmware which doesn't interact properly with a imxuart device in 2467 * FIFO mode. 2468 */ 2469 struct imxuart_softc *sc = device_private(self); 2470 2471 if (ISSET(sc->sc_hwflags, IMXUART_HW_FIFO)) 2472 UR_WRITE_1(&sc->sc_regs, IMXUART_REG_FIFO, 0); 2473 2474 return true; 2475 } 2476 #endif 2477 2478 #ifdef notyet 2479 bool 2480 imxuart_suspend(device_t self PMF_FN_ARGS) 2481 { 2482 struct imxuart_softc *sc = device_private(self); 2483 2484 UR_WRITE_1(&sc->sc_regs, IMXUART_REG_IER, 0); 2485 (void)CSR_READ_1(&sc->sc_regs, IMXUART_REG_IIR); 2486 2487 return true; 2488 } 2489 #endif 2490 2491 #ifdef notyet 2492 bool 2493 imxuart_resume(device_t self PMF_FN_ARGS) 2494 { 2495 struct imxuart_softc *sc = device_private(self); 2496 2497 mutex_spin_enter(&sc->sc_lock); 2498 imxuart_loadchannelregs(sc); 2499 mutex_spin_exit(&sc->sc_lock); 2500 2501 return true; 2502 } 2503 #endif 2504 2505 static void 2506 imxuart_enable_debugport(struct imxuart_softc *sc) 2507 { 2508 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2509 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2510 2511 if (sc->sc_hwflags & (IMXUART_HW_CONSOLE|IMXUART_HW_KGDB)) { 2512 2513 /* Turn on line break interrupt, set carrier. */ 2514 2515 sc->sc_ucr3 |= IMX_UCR3_DSR; 2516 bus_space_write_4(iot, ioh, IMX_UCR3, sc->sc_ucr3); 2517 2518 sc->sc_ucr4 |= IMX_UCR4_BKEN; 2519 bus_space_write_4(iot, ioh, IMX_UCR4, sc->sc_ucr4); 2520 2521 sc->sc_ucr2 |= IMX_UCR2_TXEN|IMX_UCR2_RXEN| 2522 IMX_UCR2_CTS; 2523 bus_space_write_4(iot, ioh, IMX_UCR2, sc->sc_ucr2); 2524 2525 sc->sc_ucr1 |= IMX_UCR1_UARTEN; 2526 bus_space_write_4(iot, ioh, IMX_UCR1, sc->sc_ucr1); 2527 } 2528 } 2529 2530 2531 void 2532 imxuart_set_frequency(u_int freq, u_int div) 2533 { 2534 imxuart_freq = freq; 2535 imxuart_freqdiv = div; 2536 } 2537