imxuart.c revision 1.12
1 /* $NetBSD: imxuart.c,v 1.12 2014/07/25 06:36:16 hkenken 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 1.12 2014/07/25 06:36:16 hkenken 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 .d_open = imxuopen, 342 .d_close = imxuclose, 343 .d_read = imxuread, 344 .d_write = imxuwrite, 345 .d_ioctl = imxuioctl, 346 .d_stop = imxustop, 347 .d_tty = imxutty, 348 .d_poll = imxupoll, 349 .d_mmap = nommap, 350 .d_kqfilter = ttykqfilter, 351 .d_flag = D_TTY 352 }; 353 354 /* 355 * Make this an option variable one can patch. 356 * But be warned: this must be a power of 2! 357 */ 358 u_int imxuart_rbuf_size = IMXUART_RING_SIZE; 359 360 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 361 u_int imxuart_rbuf_hiwat = (IMXUART_RING_SIZE * 1) / 4; 362 u_int imxuart_rbuf_lowat = (IMXUART_RING_SIZE * 3) / 4; 363 364 static struct imxuart_regs imxuconsregs; 365 static int imxuconsattached; 366 static int imxuconsrate; 367 static tcflag_t imxuconscflag; 368 static struct cnm_state imxuart_cnm_state; 369 370 u_int imxuart_freq = IMXUART_FREQ; 371 u_int imxuart_freqdiv = IMXUART_FREQDIV; 372 373 #ifdef KGDB 374 #include <sys/kgdb.h> 375 376 static struct imxuart_regs imxu_kgdb_regs; 377 static int imxu_kgdb_attached; 378 379 int imxuart_kgdb_getc(void *); 380 void imxuart_kgdb_putc(void *, int); 381 #endif /* KGDB */ 382 383 #define IMXUART_UNIT_MASK 0x7ffff 384 #define IMXUART_DIALOUT_MASK 0x80000 385 386 #define IMXUART_UNIT(x) (minor(x) & IMXUART_UNIT_MASK) 387 #define IMXUART_DIALOUT(x) (minor(x) & IMXUART_DIALOUT_MASK) 388 389 #define IMXUART_ISALIVE(sc) ((sc)->enabled != 0 && \ 390 device_is_active((sc)->sc_dev)) 391 392 #define BR BUS_SPACE_BARRIER_READ 393 #define BW BUS_SPACE_BARRIER_WRITE 394 #define IMXUART_BARRIER(r, f) \ 395 bus_space_barrier((r)->ur_iot, (r)->ur_ioh, 0, IMX_UART_SIZE, (f)) 396 397 398 void 399 imxuart_attach_common(device_t parent, device_t self, 400 bus_space_tag_t iot, paddr_t iobase, size_t size, int intr, int flags) 401 { 402 imxuart_softc_t *sc = device_private(self); 403 struct imxuart_regs *regsp = &sc->sc_regs; 404 struct tty *tp; 405 bus_space_handle_t ioh; 406 407 aprint_naive("\n"); 408 aprint_normal("\n"); 409 410 sc->sc_dev = self; 411 412 if (size <= 0) 413 size = IMX_UART_SIZE; 414 415 sc->sc_intr = intr; 416 regsp->ur_iot = iot; 417 regsp->ur_iobase = iobase; 418 419 if (bus_space_map(iot, regsp->ur_iobase, size, 0, &ioh)) { 420 return; 421 } 422 regsp->ur_ioh = ioh; 423 424 callout_init(&sc->sc_diag_callout, 0); 425 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH); 426 427 bus_space_read_region_4(iot, ioh, IMX_UCR1, sc->sc_ucr, 4); 428 sc->sc_ucr2_d = sc->sc_ucr2; 429 430 /* Disable interrupts before configuring the device. */ 431 imxuart_disable_all_interrupts(sc); 432 433 if (regsp->ur_iobase == imxuconsregs.ur_iobase) { 434 imxuconsattached = 1; 435 436 /* Make sure the console is always "hardwired". */ 437 #if 0 438 delay(10000); /* wait for output to finish */ 439 #endif 440 SET(sc->sc_hwflags, IMXUART_HW_CONSOLE); 441 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 442 } 443 444 445 tp = tty_alloc(); 446 tp->t_oproc = imxustart; 447 tp->t_param = imxuparam; 448 tp->t_hwiflow = imxuhwiflow; 449 450 sc->sc_tty = tp; 451 sc->sc_rbuf = malloc(sizeof (*sc->sc_rbuf) * imxuart_rbuf_size, 452 M_DEVBUF, M_NOWAIT); 453 sc->sc_rbuf_size = imxuart_rbuf_size; 454 sc->sc_rbuf_in = sc->sc_rbuf_out = 0; 455 if (sc->sc_rbuf == NULL) { 456 aprint_error_dev(sc->sc_dev, 457 "unable to allocate ring buffer\n"); 458 return; 459 } 460 461 sc->sc_txfifo_len = 32; 462 sc->sc_txfifo_thresh = 16; /* when USR1.TRDY, fifo has space 463 * for this many characters */ 464 465 tty_attach(tp); 466 467 if (ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 468 int maj; 469 470 /* locate the major number */ 471 maj = cdevsw_lookup_major(&imxcom_cdevsw); 472 473 if (maj != NODEVMAJOR) { 474 tp->t_dev = cn_tab->cn_dev = makedev(maj, 475 device_unit(sc->sc_dev)); 476 477 aprint_normal_dev(sc->sc_dev, "console\n"); 478 } 479 } 480 481 sc->sc_ih = intr_establish(sc->sc_intr, IPL_SERIAL, IST_LEVEL, 482 imxuintr, sc); 483 if (sc->sc_ih == NULL) 484 aprint_error_dev(sc->sc_dev, "intr_establish failed\n"); 485 486 #ifdef KGDB 487 /* 488 * Allow kgdb to "take over" this port. If this is 489 * not the console and is the kgdb device, it has 490 * exclusive use. If it's the console _and_ the 491 * kgdb device, it doesn't. 492 */ 493 if (regsp->ur_iobase == imxu_kgdb_regs.ur_iobase) { 494 if (!ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 495 imxu_kgdb_attached = 1; 496 497 SET(sc->sc_hwflags, IMXUART_HW_KGDB); 498 } 499 aprint_normal_dev(sc->sc_dev, "kgdb\n"); 500 } 501 #endif 502 503 sc->sc_si = softint_establish(SOFTINT_SERIAL, imxusoft, sc); 504 505 #ifdef RND_COM 506 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), 507 RND_TYPE_TTY, 0); 508 #endif 509 510 /* if there are no enable/disable functions, assume the device 511 is always enabled */ 512 if (!sc->enable) 513 sc->enabled = 1; 514 515 imxuart_enable_debugport(sc); 516 517 SET(sc->sc_hwflags, IMXUART_HW_DEV_OK); 518 519 //shutdownhook_establish(imxuart_shutdownhook, sc); 520 521 522 #if 0 523 { 524 uint32_t reg; 525 reg = bus_space_read_4(iot, ioh, IMX_UCR1); 526 reg |= IMX_UCR1_TXDMAEN | IMX_UCR1_RXDMAEN; 527 bus_space_write_4(iot, ioh, IMX_UCR1, reg); 528 } 529 #endif 530 } 531 532 /* 533 * baudrate = RefFreq / (16 * (UMBR + 1)/(UBIR + 1)) 534 * 535 * (UBIR + 1) / (UBMR + 1) = (16 * BaurdRate) / RefFreq 536 */ 537 538 static long 539 gcd(long m, long n) 540 { 541 542 if (m < n) 543 return gcd(n, m); 544 545 if (n <= 0) 546 return m; 547 return gcd(n, m % n); 548 } 549 550 551 int 552 imxuspeed(long speed, struct imxuart_baudrate_ratio *ratio) 553 { 554 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 555 long b = 16 * speed; 556 long f = imxuart_freq / imxuart_freqdiv; 557 long d; 558 int err = 0; 559 560 /* reduce b/f */ 561 while ((f > (1<<16) || b > (1<<16)) && (d = gcd(f, b)) > 1) { 562 f /= d; 563 b /= d; 564 } 565 566 567 while (f > (1<<16) || b > (1<<16)) { 568 f /= 2; 569 b /= 2; 570 } 571 if (f <= 0 || b <= 0) 572 return -1; 573 574 #ifdef DIAGNOSTIC 575 err = divrnd(((uint64_t)imxuart_freq) * 1000 / imxuart_freqdiv, 576 (uint64_t)speed * 16 * f / b) - 1000; 577 if (err < 0) 578 err = -err; 579 #endif 580 581 ratio->numerator = b-1; 582 ratio->modulator = f-1; 583 584 if (err > IMXUART_TOLERANCE) 585 return -1; 586 587 return 0; 588 #undef divrnd 589 } 590 591 #ifdef IMXUART_DEBUG 592 int imxuart_debug = 0; 593 594 void imxustatus(struct imxuart_softc *, const char *); 595 void 596 imxustatus(struct imxuart_softc *sc, const char *str) 597 { 598 struct tty *tp = sc->sc_tty; 599 600 aprint_normal_dev(sc->sc_dev, 601 "%s %cclocal %cdcd %cts_carr_on %cdtr %ctx_stopped\n", 602 str, 603 ISSET(tp->t_cflag, CLOCAL) ? '+' : '-', 604 ISSET(sc->sc_msr, MSR_DCD) ? '+' : '-', 605 ISSET(tp->t_state, TS_CARR_ON) ? '+' : '-', 606 ISSET(sc->sc_mcr, MCR_DTR) ? '+' : '-', 607 sc->sc_tx_stopped ? '+' : '-'); 608 609 aprint_normal_dev(sc->sc_dev, 610 "%s %ccrtscts %ccts %cts_ttstop %crts rx_flags=0x%x\n", 611 str, 612 ISSET(tp->t_cflag, CRTSCTS) ? '+' : '-', 613 ISSET(sc->sc_msr, MSR_CTS) ? '+' : '-', 614 ISSET(tp->t_state, TS_TTSTOP) ? '+' : '-', 615 ISSET(sc->sc_mcr, MCR_RTS) ? '+' : '-', 616 sc->sc_rx_flags); 617 } 618 #endif 619 620 #if 0 621 int 622 imxuart_detach(device_t self, int flags) 623 { 624 struct imxuart_softc *sc = device_private(self); 625 int maj, mn; 626 627 if (ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) 628 return EBUSY; 629 630 /* locate the major number */ 631 maj = cdevsw_lookup_major(&imxcom_cdevsw); 632 633 /* Nuke the vnodes for any open instances. */ 634 mn = device_unit(self); 635 vdevgone(maj, mn, mn, VCHR); 636 637 mn |= IMXUART_DIALOUT_MASK; 638 vdevgone(maj, mn, mn, VCHR); 639 640 if (sc->sc_rbuf == NULL) { 641 /* 642 * Ring buffer allocation failed in the imxuart_attach_subr, 643 * only the tty is allocated, and nothing else. 644 */ 645 tty_free(sc->sc_tty); 646 return 0; 647 } 648 649 /* Free the receive buffer. */ 650 free(sc->sc_rbuf, M_DEVBUF); 651 652 /* Detach and free the tty. */ 653 tty_detach(sc->sc_tty); 654 tty_free(sc->sc_tty); 655 656 /* Unhook the soft interrupt handler. */ 657 softint_disestablish(sc->sc_si); 658 659 #ifdef RND_COM 660 /* Unhook the entropy source. */ 661 rnd_detach_source(&sc->rnd_source); 662 #endif 663 callout_destroy(&sc->sc_diag_callout); 664 665 /* Destroy the lock. */ 666 mutex_destroy(&sc->sc_lock); 667 668 return (0); 669 } 670 #endif 671 672 #ifdef notyet 673 int 674 imxuart_activate(device_t self, enum devact act) 675 { 676 struct imxuart_softc *sc = device_private(self); 677 int rv = 0; 678 679 switch (act) { 680 case DVACT_ACTIVATE: 681 rv = EOPNOTSUPP; 682 break; 683 684 case DVACT_DEACTIVATE: 685 if (sc->sc_hwflags & (IMXUART_HW_CONSOLE|IMXUART_HW_KGDB)) { 686 rv = EBUSY; 687 break; 688 } 689 690 if (sc->disable != NULL && sc->enabled != 0) { 691 (*sc->disable)(sc); 692 sc->enabled = 0; 693 } 694 break; 695 } 696 697 return (rv); 698 } 699 #endif 700 701 void 702 imxuart_shutdown(struct imxuart_softc *sc) 703 { 704 struct tty *tp = sc->sc_tty; 705 706 mutex_spin_enter(&sc->sc_lock); 707 708 /* If we were asserting flow control, then deassert it. */ 709 SET(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED); 710 imxuart_hwiflow(sc); 711 712 /* Clear any break condition set with TIOCSBRK. */ 713 imxuart_break(sc, false); 714 715 /* 716 * Hang up if necessary. Wait a bit, so the other side has time to 717 * notice even if we immediately open the port again. 718 * Avoid tsleeping above splhigh(). 719 */ 720 if (ISSET(tp->t_cflag, HUPCL)) { 721 imxuart_modem(sc, 0); 722 mutex_spin_exit(&sc->sc_lock); 723 /* XXX will only timeout */ 724 (void) kpause(ttclos, false, hz, NULL); 725 mutex_spin_enter(&sc->sc_lock); 726 } 727 728 /* Turn off interrupts. */ 729 imxuart_disable_all_interrupts(sc); 730 /* re-enable recv interrupt for console or kgdb port */ 731 imxuart_enable_debugport(sc); 732 733 mutex_spin_exit(&sc->sc_lock); 734 735 #ifdef notyet 736 if (sc->disable) { 737 #ifdef DIAGNOSTIC 738 if (!sc->enabled) 739 panic("imxuart_shutdown: not enabled?"); 740 #endif 741 (*sc->disable)(sc); 742 sc->enabled = 0; 743 } 744 #endif 745 } 746 747 int 748 imxuopen(dev_t dev, int flag, int mode, struct lwp *l) 749 { 750 struct imxuart_softc *sc; 751 struct tty *tp; 752 int s; 753 int error; 754 755 sc = device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 756 if (sc == NULL || !ISSET(sc->sc_hwflags, IMXUART_HW_DEV_OK) || 757 sc->sc_rbuf == NULL) 758 return (ENXIO); 759 760 if (!device_is_active(sc->sc_dev)) 761 return (ENXIO); 762 763 #ifdef KGDB 764 /* 765 * If this is the kgdb port, no other use is permitted. 766 */ 767 if (ISSET(sc->sc_hwflags, IMXUART_HW_KGDB)) 768 return (EBUSY); 769 #endif 770 771 tp = sc->sc_tty; 772 773 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 774 return (EBUSY); 775 776 s = spltty(); 777 778 /* 779 * Do the following iff this is a first open. 780 */ 781 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 782 struct termios t; 783 784 tp->t_dev = dev; 785 786 787 #ifdef notyet 788 if (sc->enable) { 789 if ((*sc->enable)(sc)) { 790 splx(s); 791 aprint_error_dev(sc->sc_dev, 792 "device enable failed\n"); 793 return (EIO); 794 } 795 sc->enabled = 1; 796 } 797 #endif 798 799 mutex_spin_enter(&sc->sc_lock); 800 801 imxuart_disable_all_interrupts(sc); 802 803 /* Fetch the current modem control status, needed later. */ 804 805 #ifdef IMXUART_PPS 806 /* Clear PPS capture state on first open. */ 807 mutex_spin_enter(&timecounter_lock); 808 memset(&sc->sc_pps_state, 0, sizeof(sc->sc_pps_state)); 809 sc->sc_pps_state.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR; 810 pps_init(&sc->sc_pps_state); 811 mutex_spin_exit(&timecounter_lock); 812 #endif 813 814 mutex_spin_exit(&sc->sc_lock); 815 816 /* 817 * Initialize the termios status to the defaults. Add in the 818 * sticky bits from TIOCSFLAGS. 819 */ 820 if (ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 821 t.c_ospeed = imxuconsrate; 822 t.c_cflag = imxuconscflag; 823 } else { 824 t.c_ospeed = TTYDEF_SPEED; 825 t.c_cflag = TTYDEF_CFLAG; 826 } 827 t.c_ispeed = t.c_ospeed; 828 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 829 SET(t.c_cflag, CLOCAL); 830 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 831 SET(t.c_cflag, CRTSCTS); 832 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 833 SET(t.c_cflag, MDMBUF); 834 /* Make sure imxuparam() will do something. */ 835 tp->t_ospeed = 0; 836 (void) imxuparam(tp, &t); 837 tp->t_iflag = TTYDEF_IFLAG; 838 tp->t_oflag = TTYDEF_OFLAG; 839 tp->t_lflag = TTYDEF_LFLAG; 840 ttychars(tp); 841 ttsetwater(tp); 842 843 mutex_spin_enter(&sc->sc_lock); 844 845 /* 846 * Turn on DTR. We must always do this, even if carrier is not 847 * present, because otherwise we'd have to use TIOCSDTR 848 * immediately after setting CLOCAL, which applications do not 849 * expect. We always assert DTR while the device is open 850 * unless explicitly requested to deassert it. 851 */ 852 imxuart_modem(sc, 1); 853 854 /* Clear the input ring, and unblock. */ 855 sc->sc_rbuf_in = sc->sc_rbuf_out = 0; 856 imxuart_iflush(sc); 857 CLR(sc->sc_rx_flags, IMXUART_RX_ANY_BLOCK); 858 imxuart_hwiflow(sc); 859 860 /* Turn on interrupts. */ 861 imxuart_control_rxint(sc, true); 862 863 #ifdef IMXUART_DEBUG 864 if (imxuart_debug) 865 imxustatus(sc, "imxuopen "); 866 #endif 867 868 mutex_spin_exit(&sc->sc_lock); 869 } 870 871 splx(s); 872 873 #if 0 874 error = ttyopen(tp, IMXUART_DIALOUT(dev), ISSET(flag, O_NONBLOCK)); 875 #else 876 error = ttyopen(tp, 1, ISSET(flag, O_NONBLOCK)); 877 #endif 878 if (error) 879 goto bad; 880 881 error = (*tp->t_linesw->l_open)(dev, tp); 882 if (error) 883 goto bad; 884 885 return (0); 886 887 bad: 888 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 889 /* 890 * We failed to open the device, and nobody else had it opened. 891 * Clean up the state as appropriate. 892 */ 893 imxuart_shutdown(sc); 894 } 895 896 return (error); 897 } 898 899 int 900 imxuclose(dev_t dev, int flag, int mode, struct lwp *l) 901 { 902 struct imxuart_softc *sc = 903 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 904 struct tty *tp = sc->sc_tty; 905 906 /* XXX This is for cons.c. */ 907 if (!ISSET(tp->t_state, TS_ISOPEN)) 908 return (0); 909 910 (*tp->t_linesw->l_close)(tp, flag); 911 ttyclose(tp); 912 913 if (IMXUART_ISALIVE(sc) == 0) 914 return (0); 915 916 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 917 /* 918 * Although we got a last close, the device may still be in 919 * use; e.g. if this was the dialout node, and there are still 920 * processes waiting for carrier on the non-dialout node. 921 */ 922 imxuart_shutdown(sc); 923 } 924 925 return (0); 926 } 927 928 int 929 imxuread(dev_t dev, struct uio *uio, int flag) 930 { 931 struct imxuart_softc *sc = 932 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 933 struct tty *tp = sc->sc_tty; 934 935 if (IMXUART_ISALIVE(sc) == 0) 936 return (EIO); 937 938 return ((*tp->t_linesw->l_read)(tp, uio, flag)); 939 } 940 941 int 942 imxuwrite(dev_t dev, struct uio *uio, int flag) 943 { 944 struct imxuart_softc *sc = 945 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 946 struct tty *tp = sc->sc_tty; 947 948 if (IMXUART_ISALIVE(sc) == 0) 949 return (EIO); 950 951 return ((*tp->t_linesw->l_write)(tp, uio, flag)); 952 } 953 954 int 955 imxupoll(dev_t dev, int events, struct lwp *l) 956 { 957 struct imxuart_softc *sc = 958 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 959 struct tty *tp = sc->sc_tty; 960 961 if (IMXUART_ISALIVE(sc) == 0) 962 return (POLLHUP); 963 964 return ((*tp->t_linesw->l_poll)(tp, events, l)); 965 } 966 967 struct tty * 968 imxutty(dev_t dev) 969 { 970 struct imxuart_softc *sc = 971 device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 972 struct tty *tp = sc->sc_tty; 973 974 return (tp); 975 } 976 977 int 978 imxuioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 979 { 980 struct imxuart_softc *sc; 981 struct tty *tp; 982 int error; 983 984 sc = device_lookup_private(&imxuart_cd, IMXUART_UNIT(dev)); 985 if (sc == NULL) 986 return ENXIO; 987 if (IMXUART_ISALIVE(sc) == 0) 988 return (EIO); 989 990 tp = sc->sc_tty; 991 992 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); 993 if (error != EPASSTHROUGH) 994 return (error); 995 996 error = ttioctl(tp, cmd, data, flag, l); 997 if (error != EPASSTHROUGH) 998 return (error); 999 1000 error = 0; 1001 switch (cmd) { 1002 case TIOCSFLAGS: 1003 error = kauth_authorize_device_tty(l->l_cred, 1004 KAUTH_DEVICE_TTY_PRIVSET, tp); 1005 break; 1006 default: 1007 /* nothing */ 1008 break; 1009 } 1010 if (error) { 1011 return error; 1012 } 1013 1014 mutex_spin_enter(&sc->sc_lock); 1015 1016 switch (cmd) { 1017 case TIOCSBRK: 1018 imxuart_break(sc, true); 1019 break; 1020 1021 case TIOCCBRK: 1022 imxuart_break(sc, false); 1023 break; 1024 1025 case TIOCSDTR: 1026 imxuart_modem(sc, 1); 1027 break; 1028 1029 case TIOCCDTR: 1030 imxuart_modem(sc, 0); 1031 break; 1032 1033 case TIOCGFLAGS: 1034 *(int *)data = sc->sc_swflags; 1035 break; 1036 1037 case TIOCSFLAGS: 1038 sc->sc_swflags = *(int *)data; 1039 break; 1040 1041 case TIOCMSET: 1042 case TIOCMBIS: 1043 case TIOCMBIC: 1044 tiocm_to_imxu(sc, cmd, *(int *)data); 1045 break; 1046 1047 case TIOCMGET: 1048 *(int *)data = imxuart_to_tiocm(sc); 1049 break; 1050 1051 #ifdef notyet 1052 case PPS_IOC_CREATE: 1053 case PPS_IOC_DESTROY: 1054 case PPS_IOC_GETPARAMS: 1055 case PPS_IOC_SETPARAMS: 1056 case PPS_IOC_GETCAP: 1057 case PPS_IOC_FETCH: 1058 #ifdef PPS_SYNC 1059 case PPS_IOC_KCBIND: 1060 #endif 1061 mutex_spin_enter(&timecounter_lock); 1062 error = pps_ioctl(cmd, data, &sc->sc_pps_state); 1063 mutex_spin_exit(&timecounter_lock); 1064 break; 1065 1066 case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */ 1067 mutex_spin_enter(&timecounter_lock); 1068 #ifndef PPS_TRAILING_EDGE 1069 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1070 &sc->sc_pps_state.ppsinfo.assert_timestamp); 1071 #else 1072 TIMESPEC_TO_TIMEVAL((struct timeval *)data, 1073 &sc->sc_pps_state.ppsinfo.clear_timestamp); 1074 #endif 1075 mutex_spin_exit(&timecounter_lock); 1076 break; 1077 #endif 1078 1079 default: 1080 error = EPASSTHROUGH; 1081 break; 1082 } 1083 1084 mutex_spin_exit(&sc->sc_lock); 1085 1086 #ifdef IMXUART_DEBUG 1087 if (imxuart_debug) 1088 imxustatus(sc, "imxuioctl "); 1089 #endif 1090 1091 return (error); 1092 } 1093 1094 integrate void 1095 imxuart_schedrx(struct imxuart_softc *sc) 1096 { 1097 sc->sc_rx_ready = 1; 1098 1099 /* Wake up the poller. */ 1100 softint_schedule(sc->sc_si); 1101 } 1102 1103 void 1104 imxuart_break(struct imxuart_softc *sc, bool onoff) 1105 { 1106 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1107 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1108 1109 if (onoff) 1110 SET(sc->sc_ucr1, IMX_UCR1_SNDBRK); 1111 else 1112 CLR(sc->sc_ucr1, IMX_UCR1_SNDBRK); 1113 1114 bus_space_write_4(iot, ioh, IMX_UCR1, sc->sc_ucr1); 1115 } 1116 1117 void 1118 imxuart_modem(struct imxuart_softc *sc, int onoff) 1119 { 1120 #ifdef notyet 1121 if (sc->sc_mcr_dtr == 0) 1122 return; 1123 1124 if (onoff) 1125 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1126 else 1127 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1128 1129 if (!sc->sc_heldchange) { 1130 if (sc->sc_tx_busy) { 1131 sc->sc_heldtbc = sc->sc_tbc; 1132 sc->sc_tbc = 0; 1133 sc->sc_heldchange = 1; 1134 } else 1135 imxuart_loadchannelregs(sc); 1136 } 1137 #endif 1138 } 1139 1140 /* 1141 * RTS output is controlled by UCR2.CTS bit. 1142 * DTR output is controlled by UCR3.DSR bit. 1143 * (i.MX reference manual uses names in DCE mode) 1144 * 1145 * note: if UCR2.CTSC == 1 for automatic HW flow control, UCR2.CTS is ignored. 1146 */ 1147 void 1148 tiocm_to_imxu(struct imxuart_softc *sc, u_long how, int ttybits) 1149 { 1150 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1151 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1152 1153 uint32_t ucr2 = sc->sc_ucr2_d; 1154 uint32_t ucr3 = sc->sc_ucr3; 1155 1156 uint32_t ucr2_mask = 0; 1157 uint32_t ucr3_mask = 0; 1158 1159 1160 if (ISSET(ttybits, TIOCM_DTR)) 1161 ucr3_mask = IMX_UCR3_DSR; 1162 if (ISSET(ttybits, TIOCM_RTS)) 1163 ucr2_mask = IMX_UCR2_CTS; 1164 1165 switch (how) { 1166 case TIOCMBIC: 1167 CLR(ucr2, ucr2_mask); 1168 CLR(ucr3, ucr3_mask); 1169 break; 1170 1171 case TIOCMBIS: 1172 SET(ucr2, ucr2_mask); 1173 SET(ucr3, ucr3_mask); 1174 break; 1175 1176 case TIOCMSET: 1177 CLR(ucr2, ucr2_mask); 1178 CLR(ucr3, ucr3_mask); 1179 SET(ucr2, ucr2_mask); 1180 SET(ucr3, ucr3_mask); 1181 break; 1182 } 1183 1184 if (ucr3 != sc->sc_ucr3) { 1185 bus_space_write_4(iot, ioh, IMX_UCR3, ucr3); 1186 sc->sc_ucr3 = ucr3; 1187 } 1188 1189 if (ucr2 == sc->sc_ucr2_d) 1190 return; 1191 1192 sc->sc_ucr2_d = ucr2; 1193 /* update CTS bit only */ 1194 ucr2 = (sc->sc_ucr2 & ~IMX_UCR2_CTS) | 1195 (ucr2 & IMX_UCR2_CTS); 1196 1197 bus_space_write_4(iot, ioh, IMX_UCR2, ucr2); 1198 sc->sc_ucr2 = ucr2; 1199 } 1200 1201 int 1202 imxuart_to_tiocm(struct imxuart_softc *sc) 1203 { 1204 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1205 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1206 int ttybits = 0; 1207 uint32_t usr[2]; 1208 1209 if (ISSET(sc->sc_ucr3, IMX_UCR3_DSR)) 1210 SET(ttybits, TIOCM_DTR); 1211 if (ISSET(sc->sc_ucr2, IMX_UCR2_CTS)) 1212 SET(ttybits, TIOCM_RTS); 1213 1214 bus_space_read_region_4(iot, ioh, IMX_USR1, usr, 2); 1215 1216 if (ISSET(usr[0], IMX_USR1_RTSS)) 1217 SET(ttybits, TIOCM_CTS); 1218 1219 if (ISSET(usr[1], IMX_USR2_DCDIN)) 1220 SET(ttybits, TIOCM_CD); 1221 1222 #if 0 1223 /* XXXbsh: I couldn't find the way to read ipp_uart_dsr_dte_i signal, 1224 although there are bits in UART registers to detect delta of DSR. 1225 */ 1226 if (ISSET(imxubits, MSR_DSR)) 1227 SET(ttybits, TIOCM_DSR); 1228 #endif 1229 1230 if (ISSET(usr[1], IMX_USR2_RIIN)) 1231 SET(ttybits, TIOCM_RI); 1232 1233 1234 #ifdef notyet 1235 if (ISSET(sc->sc_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC)) 1236 SET(ttybits, TIOCM_LE); 1237 #endif 1238 1239 return (ttybits); 1240 } 1241 1242 static uint32_t 1243 cflag_to_ucr2(tcflag_t cflag, uint32_t oldval) 1244 { 1245 uint32_t val = oldval; 1246 1247 CLR(val,IMX_UCR2_WS|IMX_UCR2_PREN|IMX_UCR2_PROE|IMX_UCR2_STPB); 1248 1249 switch (cflag & CSIZE) { 1250 case CS5: 1251 case CS6: 1252 /* not suppreted. use 7-bits */ 1253 case CS7: 1254 break; 1255 case CS8: 1256 SET(val, IMX_UCR2_WS); 1257 break; 1258 } 1259 1260 1261 if (ISSET(cflag, PARENB)) { 1262 SET(val, IMX_UCR2_PREN); 1263 1264 /* odd parity */ 1265 if (!ISSET(cflag, PARODD)) 1266 SET(val, IMX_UCR2_PROE); 1267 } 1268 1269 if (ISSET(cflag, CSTOPB)) 1270 SET(val, IMX_UCR2_STPB); 1271 1272 val |= IMX_UCR2_TXEN| IMX_UCR2_RXEN|IMX_UCR2_SRST; 1273 1274 return val; 1275 } 1276 1277 int 1278 imxuparam(struct tty *tp, struct termios *t) 1279 { 1280 struct imxuart_softc *sc = 1281 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1282 struct imxuart_baudrate_ratio ratio; 1283 uint32_t ucr2; 1284 bool change_speed = tp->t_ospeed != t->c_ospeed; 1285 1286 if (IMXUART_ISALIVE(sc) == 0) 1287 return (EIO); 1288 1289 /* Check requested parameters. */ 1290 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1291 return (EINVAL); 1292 1293 /* 1294 * For the console, always force CLOCAL and !HUPCL, so that the port 1295 * is always active. 1296 */ 1297 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1298 ISSET(sc->sc_hwflags, IMXUART_HW_CONSOLE)) { 1299 SET(t->c_cflag, CLOCAL); 1300 CLR(t->c_cflag, HUPCL); 1301 } 1302 1303 /* 1304 * If there were no changes, don't do anything. This avoids dropping 1305 * input and improves performance when all we did was frob things like 1306 * VMIN and VTIME. 1307 */ 1308 if ( !change_speed && tp->t_cflag == t->c_cflag) 1309 return (0); 1310 1311 if (change_speed) { 1312 /* calculate baudrate modulator value */ 1313 if (imxuspeed(t->c_ospeed, &ratio) < 0) 1314 return (EINVAL); 1315 sc->sc_ratio = ratio; 1316 } 1317 1318 ucr2 = cflag_to_ucr2(t->c_cflag, sc->sc_ucr2_d); 1319 1320 mutex_spin_enter(&sc->sc_lock); 1321 1322 #if 0 /* flow control stuff. not yet */ 1323 /* 1324 * If we're not in a mode that assumes a connection is present, then 1325 * ignore carrier changes. 1326 */ 1327 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1328 sc->sc_msr_dcd = 0; 1329 else 1330 sc->sc_msr_dcd = MSR_DCD; 1331 /* 1332 * Set the flow control pins depending on the current flow control 1333 * mode. 1334 */ 1335 if (ISSET(t->c_cflag, CRTSCTS)) { 1336 sc->sc_mcr_dtr = MCR_DTR; 1337 sc->sc_mcr_rts = MCR_RTS; 1338 sc->sc_msr_cts = MSR_CTS; 1339 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1340 } else if (ISSET(t->c_cflag, MDMBUF)) { 1341 /* 1342 * For DTR/DCD flow control, make sure we don't toggle DTR for 1343 * carrier detection. 1344 */ 1345 sc->sc_mcr_dtr = 0; 1346 sc->sc_mcr_rts = MCR_DTR; 1347 sc->sc_msr_cts = MSR_DCD; 1348 sc->sc_efr = 0; 1349 } else { 1350 /* 1351 * If no flow control, then always set RTS. This will make 1352 * the other side happy if it mistakenly thinks we're doing 1353 * RTS/CTS flow control. 1354 */ 1355 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1356 sc->sc_mcr_rts = 0; 1357 sc->sc_msr_cts = 0; 1358 sc->sc_efr = 0; 1359 if (ISSET(sc->sc_mcr, MCR_DTR)) 1360 SET(sc->sc_mcr, MCR_RTS); 1361 else 1362 CLR(sc->sc_mcr, MCR_RTS); 1363 } 1364 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1365 #endif 1366 1367 /* And copy to tty. */ 1368 tp->t_ispeed = t->c_ospeed; 1369 tp->t_ospeed = t->c_ospeed; 1370 tp->t_cflag = t->c_cflag; 1371 1372 if (!change_speed && ucr2 == sc->sc_ucr2_d) { 1373 /* noop */ 1374 } 1375 else if (!sc->sc_pending && !sc->sc_tx_busy) { 1376 if (ucr2 != sc->sc_ucr2_d) { 1377 sc->sc_ucr2_d = ucr2; 1378 imxuart_load_params(sc); 1379 } 1380 if (change_speed) 1381 imxuart_load_speed(sc); 1382 } 1383 else { 1384 if (!sc->sc_pending) { 1385 sc->sc_heldtbc = sc->sc_tbc; 1386 sc->sc_tbc = 0; 1387 } 1388 sc->sc_pending |= 1389 (ucr2 == sc->sc_ucr2_d ? 0 : IMXUART_PEND_PARAM) | 1390 (change_speed ? 0 : IMXUART_PEND_SPEED); 1391 sc->sc_ucr2_d = ucr2; 1392 } 1393 1394 if (!ISSET(t->c_cflag, CHWFLOW)) { 1395 /* Disable the high water mark. */ 1396 sc->sc_r_hiwat = 0; 1397 sc->sc_r_lowat = 0; 1398 if (ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED)) { 1399 CLR(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED); 1400 imxuart_schedrx(sc); 1401 } 1402 if (ISSET(sc->sc_rx_flags, 1403 IMXUART_RX_TTY_BLOCKED|IMXUART_RX_IBUF_BLOCKED)) { 1404 CLR(sc->sc_rx_flags, 1405 IMXUART_RX_TTY_BLOCKED|IMXUART_RX_IBUF_BLOCKED); 1406 imxuart_hwiflow(sc); 1407 } 1408 } else { 1409 sc->sc_r_hiwat = imxuart_rbuf_hiwat; 1410 sc->sc_r_lowat = imxuart_rbuf_lowat; 1411 } 1412 1413 mutex_spin_exit(&sc->sc_lock); 1414 1415 #if 0 1416 /* 1417 * Update the tty layer's idea of the carrier bit, in case we changed 1418 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1419 * explicit request. 1420 */ 1421 (void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1422 #else 1423 /* XXX: always report that we have DCD */ 1424 (void) (*tp->t_linesw->l_modem)(tp, 1); 1425 #endif 1426 1427 #ifdef IMXUART_DEBUG 1428 if (imxuart_debug) 1429 imxustatus(sc, "imxuparam "); 1430 #endif 1431 1432 if (!ISSET(t->c_cflag, CHWFLOW)) { 1433 if (sc->sc_tx_stopped) { 1434 sc->sc_tx_stopped = 0; 1435 imxustart(tp); 1436 } 1437 } 1438 1439 return (0); 1440 } 1441 1442 void 1443 imxuart_iflush(struct imxuart_softc *sc) 1444 { 1445 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1446 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1447 #ifdef DIAGNOSTIC 1448 uint32_t reg = 0xffff; 1449 #endif 1450 int timo; 1451 1452 timo = 50000; 1453 /* flush any pending I/O */ 1454 while (ISSET(bus_space_read_4(iot, ioh, IMX_USR2), IMX_USR2_RDR) 1455 && --timo) 1456 #ifdef DIAGNOSTIC 1457 reg = 1458 #else 1459 (void) 1460 #endif 1461 bus_space_read_4(iot, ioh, IMX_URXD); 1462 #ifdef DIAGNOSTIC 1463 if (!timo) 1464 aprint_error_dev(sc->sc_dev, "imxuart_iflush timeout %02x\n", reg); 1465 #endif 1466 } 1467 1468 int 1469 imxuhwiflow(struct tty *tp, int block) 1470 { 1471 struct imxuart_softc *sc = 1472 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1473 1474 if (IMXUART_ISALIVE(sc) == 0) 1475 return (0); 1476 1477 #ifdef notyet 1478 if (sc->sc_mcr_rts == 0) 1479 return (0); 1480 #endif 1481 1482 mutex_spin_enter(&sc->sc_lock); 1483 1484 if (block) { 1485 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED)) { 1486 SET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED); 1487 imxuart_hwiflow(sc); 1488 } 1489 } else { 1490 if (ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED)) { 1491 CLR(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED); 1492 imxuart_schedrx(sc); 1493 } 1494 if (ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED)) { 1495 CLR(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED); 1496 imxuart_hwiflow(sc); 1497 } 1498 } 1499 1500 mutex_spin_exit(&sc->sc_lock); 1501 return (1); 1502 } 1503 1504 /* 1505 * (un)block input via hw flowcontrol 1506 */ 1507 void 1508 imxuart_hwiflow(struct imxuart_softc *sc) 1509 { 1510 #ifdef notyet 1511 struct imxuart_regs *regsp= &sc->sc_regs; 1512 1513 if (sc->sc_mcr_rts == 0) 1514 return; 1515 1516 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1517 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1518 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1519 } else { 1520 SET(sc->sc_mcr, sc->sc_mcr_rts); 1521 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1522 } 1523 UR_WRITE_1(regsp, IMXUART_REG_MCR, sc->sc_mcr_active); 1524 #endif 1525 } 1526 1527 1528 void 1529 imxustart(struct tty *tp) 1530 { 1531 struct imxuart_softc *sc = 1532 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1533 int s; 1534 u_char *tba; 1535 int tbc; 1536 u_int n; 1537 u_int space; 1538 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1539 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1540 1541 if (IMXUART_ISALIVE(sc) == 0) 1542 return; 1543 1544 s = spltty(); 1545 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1546 goto out; 1547 if (sc->sc_tx_stopped) 1548 goto out; 1549 if (!ttypull(tp)) 1550 goto out; 1551 1552 /* Grab the first contiguous region of buffer space. */ 1553 tba = tp->t_outq.c_cf; 1554 tbc = ndqb(&tp->t_outq, 0); 1555 1556 mutex_spin_enter(&sc->sc_lock); 1557 1558 sc->sc_tba = tba; 1559 sc->sc_tbc = tbc; 1560 1561 SET(tp->t_state, TS_BUSY); 1562 sc->sc_tx_busy = 1; 1563 1564 space = imxuart_txfifo_space(sc); 1565 n = MIN(sc->sc_tbc, space); 1566 1567 bus_space_write_multi_1(iot, ioh, IMX_UTXD, sc->sc_tba, n); 1568 sc->sc_tbc -= n; 1569 sc->sc_tba += n; 1570 1571 /* Enable transmit completion interrupts */ 1572 imxuart_control_txint(sc, true); 1573 1574 mutex_spin_exit(&sc->sc_lock); 1575 out: 1576 splx(s); 1577 return; 1578 } 1579 1580 /* 1581 * Stop output on a line. 1582 */ 1583 void 1584 imxustop(struct tty *tp, int flag) 1585 { 1586 struct imxuart_softc *sc = 1587 device_lookup_private(&imxuart_cd, IMXUART_UNIT(tp->t_dev)); 1588 1589 mutex_spin_enter(&sc->sc_lock); 1590 if (ISSET(tp->t_state, TS_BUSY)) { 1591 /* Stop transmitting at the next chunk. */ 1592 sc->sc_tbc = 0; 1593 sc->sc_heldtbc = 0; 1594 if (!ISSET(tp->t_state, TS_TTSTOP)) 1595 SET(tp->t_state, TS_FLUSH); 1596 } 1597 mutex_spin_exit(&sc->sc_lock); 1598 } 1599 1600 void 1601 imxudiag(void *arg) 1602 { 1603 #ifdef notyet 1604 struct imxuart_softc *sc = arg; 1605 int overflows, floods; 1606 1607 mutex_spin_enter(&sc->sc_lock); 1608 overflows = sc->sc_overflows; 1609 sc->sc_overflows = 0; 1610 floods = sc->sc_floods; 1611 sc->sc_floods = 0; 1612 sc->sc_errors = 0; 1613 mutex_spin_exit(&sc->sc_lock); 1614 1615 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1616 device_xname(sc->sc_dev), 1617 overflows, overflows == 1 ? "" : "s", 1618 floods, floods == 1 ? "" : "s"); 1619 #endif 1620 } 1621 1622 integrate void 1623 imxuart_rxsoft(struct imxuart_softc *sc, struct tty *tp) 1624 { 1625 int (*rint)(int, struct tty *) = tp->t_linesw->l_rint; 1626 u_int cc, scc, outp; 1627 uint16_t data; 1628 u_int code; 1629 1630 scc = cc = IMXUART_RBUF_AVAIL(sc); 1631 1632 #if 0 1633 if (cc == imxuart_rbuf_size-1) { 1634 sc->sc_floods++; 1635 if (sc->sc_errors++ == 0) 1636 callout_reset(&sc->sc_diag_callout, 60 * hz, 1637 imxudiag, sc); 1638 } 1639 #endif 1640 1641 /* If not yet open, drop the entire buffer content here */ 1642 if (!ISSET(tp->t_state, TS_ISOPEN)) { 1643 sc->sc_rbuf_out = sc->sc_rbuf_in; 1644 cc = 0; 1645 } 1646 1647 outp = sc->sc_rbuf_out; 1648 1649 #define ERRBITS (IMX_URXD_PRERR|IMX_URXD_BRK|IMX_URXD_FRMERR|IMX_URXD_OVRRUN) 1650 1651 while (cc) { 1652 data = sc->sc_rbuf[outp]; 1653 code = data & IMX_URXD_RX_DATA; 1654 if (ISSET(data, ERRBITS)) { 1655 if (sc->sc_errors.err == 0) 1656 callout_reset(&sc->sc_diag_callout, 1657 60 * hz, imxudiag, sc); 1658 if (ISSET(data, IMX_URXD_OVRRUN)) 1659 sc->sc_errors.ovrrun++; 1660 if (ISSET(data, IMX_URXD_BRK)) { 1661 sc->sc_errors.brk++; 1662 SET(code, TTY_FE); 1663 } 1664 if (ISSET(data, IMX_URXD_FRMERR)) { 1665 sc->sc_errors.frmerr++; 1666 SET(code, TTY_FE); 1667 } 1668 if (ISSET(data, IMX_URXD_PRERR)) { 1669 sc->sc_errors.prerr++; 1670 SET(code, TTY_PE); 1671 } 1672 } 1673 if ((*rint)(code, tp) == -1) { 1674 /* 1675 * The line discipline's buffer is out of space. 1676 */ 1677 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_BLOCKED)) { 1678 /* 1679 * We're either not using flow control, or the 1680 * line discipline didn't tell us to block for 1681 * some reason. Either way, we have no way to 1682 * know when there's more space available, so 1683 * just drop the rest of the data. 1684 */ 1685 sc->sc_rbuf_out = sc->sc_rbuf_in; 1686 cc = 0; 1687 } else { 1688 /* 1689 * Don't schedule any more receive processing 1690 * until the line discipline tells us there's 1691 * space available (through imxuhwiflow()). 1692 * Leave the rest of the data in the input 1693 * buffer. 1694 */ 1695 SET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED); 1696 } 1697 break; 1698 } 1699 outp = IMXUART_RBUF_INC(sc, outp, 1); 1700 cc--; 1701 } 1702 1703 if (cc != scc) { 1704 sc->sc_rbuf_out = outp; 1705 mutex_spin_enter(&sc->sc_lock); 1706 1707 cc = IMXUART_RBUF_SPACE(sc); 1708 1709 /* Buffers should be ok again, release possible block. */ 1710 if (cc >= sc->sc_r_lowat) { 1711 if (ISSET(sc->sc_rx_flags, IMXUART_RX_IBUF_OVERFLOWED)) { 1712 CLR(sc->sc_rx_flags, IMXUART_RX_IBUF_OVERFLOWED); 1713 imxuart_control_rxint(sc, true); 1714 } 1715 if (ISSET(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED)) { 1716 CLR(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED); 1717 imxuart_hwiflow(sc); 1718 } 1719 } 1720 mutex_spin_exit(&sc->sc_lock); 1721 } 1722 } 1723 1724 integrate void 1725 imxuart_txsoft(struct imxuart_softc *sc, struct tty *tp) 1726 { 1727 1728 CLR(tp->t_state, TS_BUSY); 1729 if (ISSET(tp->t_state, TS_FLUSH)) 1730 CLR(tp->t_state, TS_FLUSH); 1731 else 1732 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1733 (*tp->t_linesw->l_start)(tp); 1734 } 1735 1736 integrate void 1737 imxuart_stsoft(struct imxuart_softc *sc, struct tty *tp) 1738 { 1739 #ifdef notyet 1740 u_char msr, delta; 1741 1742 mutex_spin_enter(&sc->sc_lock); 1743 msr = sc->sc_msr; 1744 delta = sc->sc_msr_delta; 1745 sc->sc_msr_delta = 0; 1746 mutex_spin_exit(&sc->sc_lock); 1747 1748 if (ISSET(delta, sc->sc_msr_dcd)) { 1749 /* 1750 * Inform the tty layer that carrier detect changed. 1751 */ 1752 (void) (*tp->t_linesw->l_modem)(tp, ISSET(msr, MSR_DCD)); 1753 } 1754 1755 if (ISSET(delta, sc->sc_msr_cts)) { 1756 /* Block or unblock output according to flow control. */ 1757 if (ISSET(msr, sc->sc_msr_cts)) { 1758 sc->sc_tx_stopped = 0; 1759 (*tp->t_linesw->l_start)(tp); 1760 } else { 1761 sc->sc_tx_stopped = 1; 1762 } 1763 } 1764 1765 #endif 1766 #ifdef IMXUART_DEBUG 1767 if (imxuart_debug) 1768 imxustatus(sc, "imxuart_stsoft"); 1769 #endif 1770 } 1771 1772 void 1773 imxusoft(void *arg) 1774 { 1775 struct imxuart_softc *sc = arg; 1776 struct tty *tp; 1777 1778 if (IMXUART_ISALIVE(sc) == 0) 1779 return; 1780 1781 tp = sc->sc_tty; 1782 1783 if (sc->sc_rx_ready) { 1784 sc->sc_rx_ready = 0; 1785 imxuart_rxsoft(sc, tp); 1786 } 1787 1788 if (sc->sc_st_check) { 1789 sc->sc_st_check = 0; 1790 imxuart_stsoft(sc, tp); 1791 } 1792 1793 if (sc->sc_tx_done) { 1794 sc->sc_tx_done = 0; 1795 imxuart_txsoft(sc, tp); 1796 } 1797 } 1798 1799 int 1800 imxuintr(void *arg) 1801 { 1802 struct imxuart_softc *sc = arg; 1803 uint32_t usr1, usr2; 1804 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1805 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1806 1807 1808 if (IMXUART_ISALIVE(sc) == 0) 1809 return (0); 1810 1811 mutex_spin_enter(&sc->sc_lock); 1812 1813 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1814 1815 1816 do { 1817 bus_space_write_4(iot, ioh, IMX_USR2, 1818 usr2 & (IMX_USR2_BRCD|IMX_USR2_ORE)); 1819 if (usr2 & IMX_USR2_BRCD) { 1820 /* Break signal detected */ 1821 int cn_trapped = 0; 1822 1823 cn_check_magic(sc->sc_tty->t_dev, 1824 CNC_BREAK, imxuart_cnm_state); 1825 if (cn_trapped) 1826 continue; 1827 #if defined(KGDB) && !defined(DDB) 1828 if (ISSET(sc->sc_hwflags, IMXUART_HW_KGDB)) { 1829 kgdb_connect(1); 1830 continue; 1831 } 1832 #endif 1833 } 1834 1835 if (usr2 & IMX_USR2_RDR) 1836 imxuintr_read(sc); 1837 1838 #ifdef IMXUART_PPS 1839 { 1840 u_char msr, delta; 1841 1842 msr = CSR_READ_1(regsp, IMXUART_REG_MSR); 1843 delta = msr ^ sc->sc_msr; 1844 sc->sc_msr = msr; 1845 if ((sc->sc_pps_state.ppsparam.mode & PPS_CAPTUREBOTH) && 1846 (delta & MSR_DCD)) { 1847 mutex_spin_enter(&timecounter_lock); 1848 pps_capture(&sc->sc_pps_state); 1849 pps_event(&sc->sc_pps_state, 1850 (msr & MSR_DCD) ? 1851 PPS_CAPTUREASSERT : 1852 PPS_CAPTURECLEAR); 1853 mutex_spin_exit(&timecounter_lock); 1854 } 1855 } 1856 #endif 1857 1858 #ifdef notyet 1859 /* 1860 * Process normal status changes 1861 */ 1862 if (ISSET(delta, sc->sc_msr_mask)) { 1863 SET(sc->sc_msr_delta, delta); 1864 1865 /* 1866 * Stop output immediately if we lose the output 1867 * flow control signal or carrier detect. 1868 */ 1869 if (ISSET(~msr, sc->sc_msr_mask)) { 1870 sc->sc_tbc = 0; 1871 sc->sc_heldtbc = 0; 1872 #ifdef IMXUART_DEBUG 1873 if (imxuart_debug) 1874 imxustatus(sc, "imxuintr "); 1875 #endif 1876 } 1877 1878 sc->sc_st_check = 1; 1879 } 1880 #endif 1881 1882 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1883 } while (usr2 & (IMX_USR2_RDR|IMX_USR2_BRCD)); 1884 1885 usr1 = bus_space_read_4(iot, ioh, IMX_USR1); 1886 if (usr1 & IMX_USR1_TRDY) 1887 imxuintr_send(sc); 1888 1889 mutex_spin_exit(&sc->sc_lock); 1890 1891 /* Wake up the poller. */ 1892 softint_schedule(sc->sc_si); 1893 1894 #ifdef RND_COM 1895 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1896 #endif 1897 1898 return (1); 1899 } 1900 1901 1902 /* 1903 * called when there is least one character in rxfifo 1904 * 1905 */ 1906 1907 static void 1908 imxuintr_read(struct imxuart_softc *sc) 1909 { 1910 int cc; 1911 uint16_t rd; 1912 uint32_t usr2; 1913 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1914 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1915 1916 cc = IMXUART_RBUF_SPACE(sc); 1917 1918 /* clear aging timer interrupt */ 1919 bus_space_write_4(iot, ioh, IMX_USR1, IMX_USR1_AGTIM); 1920 1921 while (cc > 0) { 1922 int cn_trapped = 0; 1923 1924 1925 sc->sc_rbuf[sc->sc_rbuf_in] = rd = 1926 bus_space_read_4(iot, ioh, IMX_URXD); 1927 1928 cn_check_magic(sc->sc_tty->t_dev, 1929 rd & 0xff, imxuart_cnm_state); 1930 1931 if (!cn_trapped) { 1932 sc->sc_rbuf_in = IMXUART_RBUF_INC(sc, sc->sc_rbuf_in, 1); 1933 cc--; 1934 } 1935 1936 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1937 if (!(usr2 & IMX_USR2_RDR)) 1938 break; 1939 } 1940 1941 /* 1942 * Current string of incoming characters ended because 1943 * no more data was available or we ran out of space. 1944 * Schedule a receive event if any data was received. 1945 * If we're out of space, turn off receive interrupts. 1946 */ 1947 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_TTY_OVERFLOWED)) 1948 sc->sc_rx_ready = 1; 1949 /* 1950 * See if we are in danger of overflowing a buffer. If 1951 * so, use hardware flow control to ease the pressure. 1952 */ 1953 if (!ISSET(sc->sc_rx_flags, IMXUART_RX_IBUF_BLOCKED) && 1954 cc < sc->sc_r_hiwat) { 1955 sc->sc_rx_flags |= IMXUART_RX_IBUF_BLOCKED; 1956 imxuart_hwiflow(sc); 1957 } 1958 1959 /* 1960 * If we're out of space, disable receive interrupts 1961 * until the queue has drained a bit. 1962 */ 1963 if (!cc) { 1964 sc->sc_rx_flags |= IMXUART_RX_IBUF_OVERFLOWED; 1965 imxuart_control_rxint(sc, false); 1966 } 1967 } 1968 1969 1970 1971 /* 1972 * find how many chars we can put into tx-fifo 1973 */ 1974 static u_int 1975 imxuart_txfifo_space(struct imxuart_softc *sc) 1976 { 1977 uint32_t usr1, usr2; 1978 u_int cc; 1979 bus_space_tag_t iot = sc->sc_regs.ur_iot; 1980 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 1981 1982 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 1983 if (usr2 & IMX_USR2_TXFE) 1984 cc = sc->sc_txfifo_len; 1985 else { 1986 usr1 = bus_space_read_4(iot, ioh, IMX_USR1); 1987 if (usr1 & IMX_USR1_TRDY) 1988 cc = sc->sc_txfifo_thresh; 1989 else 1990 cc = 0; 1991 } 1992 1993 return cc; 1994 } 1995 1996 void 1997 imxuintr_send(struct imxuart_softc *sc) 1998 { 1999 uint32_t usr2; 2000 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2001 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2002 int cc = 0; 2003 2004 usr2 = bus_space_read_4(iot, ioh, IMX_USR2); 2005 2006 if (sc->sc_pending) { 2007 if (usr2 & IMX_USR2_TXFE) { 2008 imxuart_load_pendings(sc); 2009 sc->sc_tbc = sc->sc_heldtbc; 2010 sc->sc_heldtbc = 0; 2011 } 2012 else { 2013 /* wait for TX fifo empty */ 2014 imxuart_control_txint(sc, true); 2015 return; 2016 } 2017 } 2018 2019 cc = imxuart_txfifo_space(sc); 2020 cc = MIN(cc, sc->sc_tbc); 2021 2022 if (cc > 0) { 2023 bus_space_write_multi_1(iot, ioh, IMX_UTXD, sc->sc_tba, cc); 2024 sc->sc_tbc -= cc; 2025 sc->sc_tba += cc; 2026 } 2027 2028 if (sc->sc_tbc > 0) 2029 imxuart_control_txint(sc, true); 2030 else { 2031 /* no more chars to send. 2032 we don't need tx interrupt any more. */ 2033 imxuart_control_txint(sc, false); 2034 if (sc->sc_tx_busy) { 2035 sc->sc_tx_busy = 0; 2036 sc->sc_tx_done = 1; 2037 } 2038 } 2039 } 2040 2041 static void 2042 imxuart_disable_all_interrupts(struct imxuart_softc *sc) 2043 { 2044 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2045 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2046 2047 sc->sc_ucr1 &= ~IMXUART_INTRS_UCR1; 2048 sc->sc_ucr2 &= ~IMXUART_INTRS_UCR2; 2049 sc->sc_ucr3 &= ~IMXUART_INTRS_UCR3; 2050 sc->sc_ucr4 &= ~IMXUART_INTRS_UCR4; 2051 2052 2053 bus_space_write_region_4(iot, ioh, IMX_UCR1, sc->sc_ucr, 4); 2054 } 2055 2056 static void 2057 imxuart_control_rxint(struct imxuart_softc *sc, bool enable) 2058 { 2059 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2060 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2061 uint32_t ucr1, ucr2; 2062 2063 ucr1 = sc->sc_ucr1; 2064 ucr2 = sc->sc_ucr2; 2065 2066 if (enable) { 2067 ucr1 |= IMX_UCR1_RRDYEN; 2068 ucr2 |= IMX_UCR2_ATEN; 2069 } 2070 else { 2071 ucr1 &= ~IMX_UCR1_RRDYEN; 2072 ucr2 &= ~IMX_UCR2_ATEN; 2073 } 2074 2075 if (ucr1 != sc->sc_ucr1 || ucr2 != sc->sc_ucr2) { 2076 sc->sc_ucr1 = ucr1; 2077 sc->sc_ucr2 = ucr2; 2078 bus_space_write_region_4(iot, ioh, IMX_UCR1, sc->sc_ucr, 2); 2079 } 2080 } 2081 2082 static void 2083 imxuart_control_txint(struct imxuart_softc *sc, bool enable) 2084 { 2085 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2086 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2087 uint32_t ucr1; 2088 uint32_t mask; 2089 2090 /* if parameter change is pending, get interrupt when Tx fifo 2091 is completely empty. otherwise, get interrupt when txfifo 2092 has less characters than threshold */ 2093 mask = sc->sc_pending ? IMX_UCR1_TXMPTYEN : IMX_UCR1_TRDYEN; 2094 2095 ucr1 = sc->sc_ucr1; 2096 2097 CLR(ucr1, IMX_UCR1_TXMPTYEN|IMX_UCR1_TRDYEN); 2098 if (enable) 2099 SET(ucr1, mask); 2100 2101 if (ucr1 != sc->sc_ucr1) { 2102 bus_space_write_4(iot, ioh, IMX_UCR1, ucr1); 2103 sc->sc_ucr1 = ucr1; 2104 } 2105 } 2106 2107 2108 static void 2109 imxuart_load_params(struct imxuart_softc *sc) 2110 { 2111 uint32_t ucr2; 2112 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2113 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2114 2115 ucr2 = (sc->sc_ucr2_d & ~IMX_UCR2_ATEN) | 2116 (sc->sc_ucr2 & IMX_UCR2_ATEN); 2117 2118 bus_space_write_4(iot, ioh, IMX_UCR2, ucr2); 2119 sc->sc_ucr2 = ucr2; 2120 } 2121 2122 static void 2123 imxuart_load_speed(struct imxuart_softc *sc) 2124 { 2125 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2126 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2127 int n, rfdiv, ufcr; 2128 2129 #ifdef notyet 2130 /* 2131 * Set the FIFO threshold based on the receive speed. 2132 * 2133 * * If it's a low speed, it's probably a mouse or some other 2134 * interactive device, so set the threshold low. 2135 * * If it's a high speed, trim the trigger level down to prevent 2136 * overflows. 2137 * * Otherwise set it a bit higher. 2138 */ 2139 if (t->c_ospeed <= 1200) 2140 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_1; 2141 else if (t->c_ospeed <= 38400) 2142 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_8; 2143 else 2144 sc->sc_fifo = FIFO_ENABLE | FIFO_TRIGGER_4; 2145 #endif 2146 2147 n = 32 - sc->sc_txfifo_thresh; 2148 n = MAX(2, n); 2149 2150 rfdiv = IMX_UFCR_DIVIDER_TO_RFDIV(imxuart_freqdiv); 2151 2152 ufcr = (n << IMX_UFCR_TXTL_SHIFT) | 2153 (rfdiv << IMX_UFCR_RFDIV_SHIFT) | 2154 (16 << IMX_UFCR_RXTL_SHIFT); 2155 2156 /* keep DCE/DTE bit */ 2157 ufcr |= bus_space_read_4(iot, ioh, IMX_UFCR) & IMX_UFCR_DCEDTE; 2158 2159 bus_space_write_4(iot, ioh, IMX_UFCR, ufcr); 2160 2161 /* UBIR must updated before UBMR */ 2162 bus_space_write_4(iot, ioh, 2163 IMX_UBIR, sc->sc_ratio.numerator); 2164 bus_space_write_4(iot, ioh, 2165 IMX_UBMR, sc->sc_ratio.modulator); 2166 2167 2168 } 2169 2170 2171 static void 2172 imxuart_load_pendings(struct imxuart_softc *sc) 2173 { 2174 if (sc->sc_pending & IMXUART_PEND_PARAM) 2175 imxuart_load_params(sc); 2176 if (sc->sc_pending & IMXUART_PEND_SPEED) 2177 imxuart_load_speed(sc); 2178 sc->sc_pending = 0; 2179 } 2180 2181 #if defined(IMXUARTCONSOLE) || defined(KGDB) 2182 2183 /* 2184 * The following functions are polled getc and putc routines, shared 2185 * by the console and kgdb glue. 2186 * 2187 * The read-ahead code is so that you can detect pending in-band 2188 * cn_magic in polled mode while doing output rather than having to 2189 * wait until the kernel decides it needs input. 2190 */ 2191 2192 #define READAHEAD_RING_LEN 16 2193 static int imxuart_readahead[READAHEAD_RING_LEN]; 2194 static int imxuart_readahead_in = 0; 2195 static int imxuart_readahead_out = 0; 2196 #define READAHEAD_IS_EMPTY() (imxuart_readahead_in==imxuart_readahead_out) 2197 #define READAHEAD_IS_FULL() \ 2198 (((imxuart_readahead_in+1) & (READAHEAD_RING_LEN-1)) ==imxuart_readahead_out) 2199 2200 int 2201 imxuart_common_getc(dev_t dev, struct imxuart_regs *regsp) 2202 { 2203 int s = splserial(); 2204 u_char c; 2205 bus_space_tag_t iot = regsp->ur_iot; 2206 bus_space_handle_t ioh = regsp->ur_ioh; 2207 uint32_t usr2; 2208 2209 /* got a character from reading things earlier */ 2210 if (imxuart_readahead_in != imxuart_readahead_out) { 2211 2212 c = imxuart_readahead[imxuart_readahead_out]; 2213 imxuart_readahead_out = (imxuart_readahead_out + 1) & 2214 (READAHEAD_RING_LEN-1); 2215 splx(s); 2216 return (c); 2217 } 2218 2219 /* block until a character becomes available */ 2220 while (!((usr2 = bus_space_read_4(iot, ioh, IMX_USR2)) & IMX_USR2_RDR)) 2221 ; 2222 2223 c = 0xff & bus_space_read_4(iot, ioh, IMX_URXD); 2224 2225 { 2226 int __attribute__((__unused__))cn_trapped = 0; /* unused */ 2227 #ifdef DDB 2228 extern int db_active; 2229 if (!db_active) 2230 #endif 2231 cn_check_magic(dev, c, imxuart_cnm_state); 2232 } 2233 splx(s); 2234 return (c); 2235 } 2236 2237 void 2238 imxuart_common_putc(dev_t dev, struct imxuart_regs *regsp, int c) 2239 { 2240 int s = splserial(); 2241 int cin, timo; 2242 bus_space_tag_t iot = regsp->ur_iot; 2243 bus_space_handle_t ioh = regsp->ur_ioh; 2244 uint32_t usr2; 2245 2246 if (!READAHEAD_IS_FULL() && 2247 ((usr2 = bus_space_read_4(iot, ioh, IMX_USR2)) & IMX_USR2_RDR)) { 2248 2249 int __attribute__((__unused__))cn_trapped = 0; 2250 cin = bus_space_read_4(iot, ioh, IMX_URXD); 2251 cn_check_magic(dev, cin & 0xff, imxuart_cnm_state); 2252 imxuart_readahead_in = (imxuart_readahead_in + 1) & 2253 (READAHEAD_RING_LEN-1); 2254 } 2255 2256 /* wait for any pending transmission to finish */ 2257 timo = 150000; 2258 do { 2259 if (bus_space_read_4(iot, ioh, IMX_USR1) & IMX_USR1_TRDY) { 2260 bus_space_write_4(iot, ioh, IMX_UTXD, c); 2261 break; 2262 } 2263 } while(--timo > 0); 2264 2265 IMXUART_BARRIER(regsp, BR | BW); 2266 2267 splx(s); 2268 } 2269 2270 /* 2271 * Initialize UART for use as console or KGDB line. 2272 */ 2273 int 2274 imxuart_init(struct imxuart_regs *regsp, int rate, tcflag_t cflag) 2275 { 2276 struct imxuart_baudrate_ratio ratio; 2277 int rfdiv = IMX_UFCR_DIVIDER_TO_RFDIV(imxuart_freqdiv); 2278 uint32_t ufcr; 2279 2280 if (bus_space_map(regsp->ur_iot, regsp->ur_iobase, IMX_UART_SIZE, 0, 2281 ®sp->ur_ioh)) 2282 return ENOMEM; /* ??? */ 2283 2284 if (imxuspeed(rate, &ratio) < 0) 2285 return EINVAL; 2286 2287 /* UBIR must updated before UBMR */ 2288 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, 2289 IMX_UBIR, ratio.numerator); 2290 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, 2291 IMX_UBMR, ratio.modulator); 2292 2293 2294 /* XXX: DTREN, DPEC */ 2295 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR3, 2296 IMX_UCR3_DSR|IMX_UCR3_RXDMUXSEL); 2297 2298 ufcr = (8 << IMX_UFCR_TXTL_SHIFT) | (rfdiv << IMX_UFCR_RFDIV_SHIFT) | 2299 (1 << IMX_UFCR_RXTL_SHIFT); 2300 /* XXX: keep DCE/DTE bit */ 2301 ufcr |= bus_space_read_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR) & 2302 IMX_UFCR_DCEDTE; 2303 2304 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UFCR, ufcr); 2305 2306 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_ONEMS, 2307 imxuart_freq / imxuart_freqdiv / 1000); 2308 2309 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR2, 2310 IMX_UCR2_IRTS| 2311 IMX_UCR2_CTSC| 2312 IMX_UCR2_WS|IMX_UCR2_TXEN| 2313 IMX_UCR2_RXEN|IMX_UCR2_SRST); 2314 /* clear status registers */ 2315 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_USR1, 0xffff); 2316 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_USR2, 0xffff); 2317 2318 2319 bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_UCR1, 2320 IMX_UCR1_UARTEN); 2321 2322 return (0); 2323 } 2324 2325 2326 #endif 2327 2328 2329 #ifdef IMXUARTCONSOLE 2330 /* 2331 * Following are all routines needed for UART to act as console 2332 */ 2333 struct consdev imxucons = { 2334 NULL, NULL, imxucngetc, imxucnputc, imxucnpollc, NULL, NULL, NULL, 2335 NODEV, CN_NORMAL 2336 }; 2337 2338 2339 int 2340 imxuart_cons_attach(bus_space_tag_t iot, paddr_t iobase, u_int rate, 2341 tcflag_t cflag) 2342 { 2343 struct imxuart_regs regs; 2344 int res; 2345 2346 regs.ur_iot = iot; 2347 regs.ur_iobase = iobase; 2348 2349 res = imxuart_init(®s, rate, cflag); 2350 if (res) 2351 return (res); 2352 2353 cn_tab = &imxucons; 2354 cn_init_magic(&imxuart_cnm_state); 2355 cn_set_magic("\047\001"); /* default magic is BREAK */ 2356 2357 imxuconsrate = rate; 2358 imxuconscflag = cflag; 2359 2360 imxuconsregs = regs; 2361 2362 return 0; 2363 } 2364 2365 int 2366 imxucngetc(dev_t dev) 2367 { 2368 return (imxuart_common_getc(dev, &imxuconsregs)); 2369 } 2370 2371 /* 2372 * Console kernel output character routine. 2373 */ 2374 void 2375 imxucnputc(dev_t dev, int c) 2376 { 2377 imxuart_common_putc(dev, &imxuconsregs, c); 2378 } 2379 2380 void 2381 imxucnpollc(dev_t dev, int on) 2382 { 2383 2384 imxuart_readahead_in = 0; 2385 imxuart_readahead_out = 0; 2386 } 2387 2388 #endif /* IMXUARTCONSOLE */ 2389 2390 #ifdef KGDB 2391 int 2392 imxuart_kgdb_attach(bus_space_tag_t iot, paddr_t iobase, u_int rate, 2393 tcflag_t cflag) 2394 { 2395 int res; 2396 2397 if (iot == imxuconsregs.ur_iot && 2398 iobase == imxuconsregs.ur_iobase) { 2399 #if !defined(DDB) 2400 return (EBUSY); /* cannot share with console */ 2401 #else 2402 imxu_kgdb_regs.ur_iot = iot; 2403 imxu_kgdb_regs.ur_ioh = imxuconsregs.ur_ioh; 2404 imxu_kgdb_regs.ur_iobase = iobase; 2405 #endif 2406 } else { 2407 imxu_kgdb_regs.ur_iot = iot; 2408 imxu_kgdb_regs.ur_iobase = iobase; 2409 2410 res = imxuart_init(&imxu_kgdb_regs, rate, cflag); 2411 if (res) 2412 return (res); 2413 2414 /* 2415 * XXXfvdl this shouldn't be needed, but the cn_magic goo 2416 * expects this to be initialized 2417 */ 2418 cn_init_magic(&imxuart_cnm_state); 2419 cn_set_magic("\047\001"); 2420 } 2421 2422 kgdb_attach(imxuart_kgdb_getc, imxuart_kgdb_putc, &imxu_kgdb_regs); 2423 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 2424 2425 return (0); 2426 } 2427 2428 /* ARGSUSED */ 2429 int 2430 imxuart_kgdb_getc(void *arg) 2431 { 2432 struct imxuart_regs *regs = arg; 2433 2434 return (imxuart_common_getc(NODEV, regs)); 2435 } 2436 2437 /* ARGSUSED */ 2438 void 2439 imxuart_kgdb_putc(void *arg, int c) 2440 { 2441 struct imxuart_regs *regs = arg; 2442 2443 imxuart_common_putc(NODEV, regs, c); 2444 } 2445 #endif /* KGDB */ 2446 2447 /* helper function to identify the imxu ports used by 2448 console or KGDB (and not yet autoconf attached) */ 2449 int 2450 imxuart_is_console(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t *ioh) 2451 { 2452 bus_space_handle_t help; 2453 2454 if (!imxuconsattached && 2455 iot == imxuconsregs.ur_iot && iobase == imxuconsregs.ur_iobase) 2456 help = imxuconsregs.ur_ioh; 2457 #ifdef KGDB 2458 else if (!imxu_kgdb_attached && 2459 iot == imxu_kgdb_regs.ur_iot && iobase == imxu_kgdb_regs.ur_iobase) 2460 help = imxu_kgdb_regs.ur_ioh; 2461 #endif 2462 else 2463 return (0); 2464 2465 if (ioh) 2466 *ioh = help; 2467 return (1); 2468 } 2469 2470 #ifdef notyet 2471 2472 bool 2473 imxuart_cleanup(device_t self, int how) 2474 { 2475 /* 2476 * this routine exists to serve as a shutdown hook for systems that 2477 * have firmware which doesn't interact properly with a imxuart device in 2478 * FIFO mode. 2479 */ 2480 struct imxuart_softc *sc = device_private(self); 2481 2482 if (ISSET(sc->sc_hwflags, IMXUART_HW_FIFO)) 2483 UR_WRITE_1(&sc->sc_regs, IMXUART_REG_FIFO, 0); 2484 2485 return true; 2486 } 2487 #endif 2488 2489 #ifdef notyet 2490 bool 2491 imxuart_suspend(device_t self PMF_FN_ARGS) 2492 { 2493 struct imxuart_softc *sc = device_private(self); 2494 2495 UR_WRITE_1(&sc->sc_regs, IMXUART_REG_IER, 0); 2496 (void)CSR_READ_1(&sc->sc_regs, IMXUART_REG_IIR); 2497 2498 return true; 2499 } 2500 #endif 2501 2502 #ifdef notyet 2503 bool 2504 imxuart_resume(device_t self PMF_FN_ARGS) 2505 { 2506 struct imxuart_softc *sc = device_private(self); 2507 2508 mutex_spin_enter(&sc->sc_lock); 2509 imxuart_loadchannelregs(sc); 2510 mutex_spin_exit(&sc->sc_lock); 2511 2512 return true; 2513 } 2514 #endif 2515 2516 static void 2517 imxuart_enable_debugport(struct imxuart_softc *sc) 2518 { 2519 bus_space_tag_t iot = sc->sc_regs.ur_iot; 2520 bus_space_handle_t ioh = sc->sc_regs.ur_ioh; 2521 2522 if (sc->sc_hwflags & (IMXUART_HW_CONSOLE|IMXUART_HW_KGDB)) { 2523 2524 /* Turn on line break interrupt, set carrier. */ 2525 2526 sc->sc_ucr3 |= IMX_UCR3_DSR; 2527 bus_space_write_4(iot, ioh, IMX_UCR3, sc->sc_ucr3); 2528 2529 sc->sc_ucr4 |= IMX_UCR4_BKEN; 2530 bus_space_write_4(iot, ioh, IMX_UCR4, sc->sc_ucr4); 2531 2532 sc->sc_ucr2 |= IMX_UCR2_TXEN|IMX_UCR2_RXEN| 2533 IMX_UCR2_CTS; 2534 bus_space_write_4(iot, ioh, IMX_UCR2, sc->sc_ucr2); 2535 2536 sc->sc_ucr1 |= IMX_UCR1_UARTEN; 2537 bus_space_write_4(iot, ioh, IMX_UCR1, sc->sc_ucr1); 2538 } 2539 } 2540 2541 2542 void 2543 imxuart_set_frequency(u_int freq, u_int div) 2544 { 2545 imxuart_freq = freq; 2546 imxuart_freqdiv = div; 2547 } 2548
Indexes created Mon Sep 29 21:09:56 GMT 2025