uart_dev_sab82532.c revision 262649
1/*- 2 * Copyright (c) 2003 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/sys/dev/uart/uart_dev_sab82532.c 262649 2014-03-01 04:16:54Z imp $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/bus.h> 33#include <sys/conf.h> 34#include <machine/bus.h> 35 36#include <dev/uart/uart.h> 37#include <dev/uart/uart_cpu.h> 38#include <dev/uart/uart_bus.h> 39 40#include <dev/ic/sab82532.h> 41 42#include "uart_if.h" 43 44#define DEFAULT_RCLK 29491200 45 46/* 47 * NOTE: To allow us to read the baudrate divisor from the chip, we 48 * copy the value written to the write-only BGR register to an unused 49 * read-write register. We use TCR for that. 50 */ 51 52static int 53sab82532_delay(struct uart_bas *bas) 54{ 55 int divisor, m, n; 56 uint8_t bgr, ccr2; 57 58 bgr = uart_getreg(bas, SAB_TCR); 59 ccr2 = uart_getreg(bas, SAB_CCR2); 60 n = (bgr & 0x3f) + 1; 61 m = (bgr >> 6) | ((ccr2 >> 4) & 0xC); 62 divisor = n * (1<<m); 63 64 /* 1/10th the time to transmit 1 character (estimate). */ 65 return (16000000 * divisor / bas->rclk); 66} 67 68static int 69sab82532_divisor(int rclk, int baudrate) 70{ 71 int act_baud, act_div, divisor; 72 int error, m, n; 73 74 if (baudrate == 0) 75 return (0); 76 77 divisor = (rclk / (baudrate << 3) + 1) >> 1; 78 if (divisor < 2 || divisor >= 1048576) 79 return (0); 80 81 /* Find the best (N+1,M) pair. */ 82 for (m = 1; m < 15; m++) { 83 n = divisor / (1<<m); 84 if (n < 1 || n > 63) 85 continue; 86 act_div = n * (1<<m); 87 act_baud = rclk / (act_div << 4); 88 89 /* 10 times error in percent: */ 90 error = ((act_baud - baudrate) * 2000 / baudrate + 1) >> 1; 91 92 /* 3.0% maximum error tolerance: */ 93 if (error < -30 || error > 30) 94 continue; 95 96 /* Got it. */ 97 return ((n - 1) | (m << 6)); 98 } 99 100 return (0); 101} 102 103static void 104sab82532_flush(struct uart_bas *bas, int what) 105{ 106 107 if (what & UART_FLUSH_TRANSMITTER) { 108 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 109 ; 110 uart_setreg(bas, SAB_CMDR, SAB_CMDR_XRES); 111 uart_barrier(bas); 112 } 113 if (what & UART_FLUSH_RECEIVER) { 114 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 115 ; 116 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RRES); 117 uart_barrier(bas); 118 } 119} 120 121static int 122sab82532_param(struct uart_bas *bas, int baudrate, int databits, int stopbits, 123 int parity) 124{ 125 int divisor; 126 uint8_t ccr2, dafo; 127 128 if (databits >= 8) 129 dafo = SAB_DAFO_CHL_CS8; 130 else if (databits == 7) 131 dafo = SAB_DAFO_CHL_CS7; 132 else if (databits == 6) 133 dafo = SAB_DAFO_CHL_CS6; 134 else 135 dafo = SAB_DAFO_CHL_CS5; 136 if (stopbits > 1) 137 dafo |= SAB_DAFO_STOP; 138 switch (parity) { 139 case UART_PARITY_EVEN: dafo |= SAB_DAFO_PAR_EVEN; break; 140 case UART_PARITY_MARK: dafo |= SAB_DAFO_PAR_MARK; break; 141 case UART_PARITY_NONE: dafo |= SAB_DAFO_PAR_NONE; break; 142 case UART_PARITY_ODD: dafo |= SAB_DAFO_PAR_ODD; break; 143 case UART_PARITY_SPACE: dafo |= SAB_DAFO_PAR_SPACE; break; 144 default: return (EINVAL); 145 } 146 147 /* Set baudrate. */ 148 if (baudrate > 0) { 149 divisor = sab82532_divisor(bas->rclk, baudrate); 150 if (divisor == 0) 151 return (EINVAL); 152 uart_setreg(bas, SAB_BGR, divisor & 0xff); 153 uart_barrier(bas); 154 /* Allow reading the (n-1,m) tuple from the chip. */ 155 uart_setreg(bas, SAB_TCR, divisor & 0xff); 156 uart_barrier(bas); 157 ccr2 = uart_getreg(bas, SAB_CCR2); 158 ccr2 &= ~(SAB_CCR2_BR9 | SAB_CCR2_BR8); 159 ccr2 |= (divisor >> 2) & (SAB_CCR2_BR9 | SAB_CCR2_BR8); 160 uart_setreg(bas, SAB_CCR2, ccr2); 161 uart_barrier(bas); 162 } 163 164 uart_setreg(bas, SAB_DAFO, dafo); 165 uart_barrier(bas); 166 return (0); 167} 168 169/* 170 * Low-level UART interface. 171 */ 172static int sab82532_probe(struct uart_bas *bas); 173static void sab82532_init(struct uart_bas *bas, int, int, int, int); 174static void sab82532_term(struct uart_bas *bas); 175static void sab82532_putc(struct uart_bas *bas, int); 176static int sab82532_rxready(struct uart_bas *bas); 177static int sab82532_getc(struct uart_bas *bas, struct mtx *); 178 179static struct uart_ops uart_sab82532_ops = { 180 .probe = sab82532_probe, 181 .init = sab82532_init, 182 .term = sab82532_term, 183 .putc = sab82532_putc, 184 .rxready = sab82532_rxready, 185 .getc = sab82532_getc, 186}; 187 188static int 189sab82532_probe(struct uart_bas *bas) 190{ 191 192 return (0); 193} 194 195static void 196sab82532_init(struct uart_bas *bas, int baudrate, int databits, int stopbits, 197 int parity) 198{ 199 uint8_t ccr0, pvr; 200 201 if (bas->rclk == 0) 202 bas->rclk = DEFAULT_RCLK; 203 204 /* 205 * Set all pins, except the DTR pins (pin 1 and 2) to be inputs. 206 * Pin 4 is magical, meaning that I don't know what it does, but 207 * it too has to be set to output. 208 */ 209 uart_setreg(bas, SAB_PCR, 210 ~(SAB_PVR_DTR_A|SAB_PVR_DTR_B|SAB_PVR_MAGIC)); 211 uart_barrier(bas); 212 /* Disable port interrupts. */ 213 uart_setreg(bas, SAB_PIM, 0xff); 214 uart_barrier(bas); 215 /* Interrupts are active low. */ 216 uart_setreg(bas, SAB_IPC, SAB_IPC_ICPL); 217 uart_barrier(bas); 218 /* Set DTR. */ 219 pvr = uart_getreg(bas, SAB_PVR); 220 switch (bas->chan) { 221 case 1: 222 pvr &= ~SAB_PVR_DTR_A; 223 break; 224 case 2: 225 pvr &= ~SAB_PVR_DTR_B; 226 break; 227 } 228 uart_setreg(bas, SAB_PVR, pvr | SAB_PVR_MAGIC); 229 uart_barrier(bas); 230 231 /* power down */ 232 uart_setreg(bas, SAB_CCR0, 0); 233 uart_barrier(bas); 234 235 /* set basic configuration */ 236 ccr0 = SAB_CCR0_MCE|SAB_CCR0_SC_NRZ|SAB_CCR0_SM_ASYNC; 237 uart_setreg(bas, SAB_CCR0, ccr0); 238 uart_barrier(bas); 239 uart_setreg(bas, SAB_CCR1, SAB_CCR1_ODS|SAB_CCR1_BCR|SAB_CCR1_CM_7); 240 uart_barrier(bas); 241 uart_setreg(bas, SAB_CCR2, SAB_CCR2_BDF|SAB_CCR2_SSEL|SAB_CCR2_TOE); 242 uart_barrier(bas); 243 uart_setreg(bas, SAB_CCR3, 0); 244 uart_barrier(bas); 245 uart_setreg(bas, SAB_CCR4, SAB_CCR4_MCK4|SAB_CCR4_EBRG|SAB_CCR4_ICD); 246 uart_barrier(bas); 247 uart_setreg(bas, SAB_MODE, SAB_MODE_FCTS|SAB_MODE_RTS|SAB_MODE_RAC); 248 uart_barrier(bas); 249 uart_setreg(bas, SAB_RFC, SAB_RFC_DPS|SAB_RFC_RFDF| 250 SAB_RFC_RFTH_32CHAR); 251 uart_barrier(bas); 252 253 sab82532_param(bas, baudrate, databits, stopbits, parity); 254 255 /* Clear interrupts. */ 256 uart_setreg(bas, SAB_IMR0, (unsigned char)~SAB_IMR0_TCD); 257 uart_setreg(bas, SAB_IMR1, 0xff); 258 uart_barrier(bas); 259 uart_getreg(bas, SAB_ISR0); 260 uart_getreg(bas, SAB_ISR1); 261 uart_barrier(bas); 262 263 sab82532_flush(bas, UART_FLUSH_TRANSMITTER|UART_FLUSH_RECEIVER); 264 265 /* Power up. */ 266 uart_setreg(bas, SAB_CCR0, ccr0|SAB_CCR0_PU); 267 uart_barrier(bas); 268} 269 270static void 271sab82532_term(struct uart_bas *bas) 272{ 273 uint8_t pvr; 274 275 pvr = uart_getreg(bas, SAB_PVR); 276 switch (bas->chan) { 277 case 1: 278 pvr |= SAB_PVR_DTR_A; 279 break; 280 case 2: 281 pvr |= SAB_PVR_DTR_B; 282 break; 283 } 284 uart_setreg(bas, SAB_PVR, pvr); 285 uart_barrier(bas); 286} 287 288static void 289sab82532_putc(struct uart_bas *bas, int c) 290{ 291 int delay, limit; 292 293 /* 1/10th the time to transmit 1 character (estimate). */ 294 delay = sab82532_delay(bas); 295 296 limit = 20; 297 while ((uart_getreg(bas, SAB_STAR) & SAB_STAR_TEC) && --limit) 298 DELAY(delay); 299 uart_setreg(bas, SAB_TIC, c); 300 limit = 20; 301 while ((uart_getreg(bas, SAB_STAR) & SAB_STAR_TEC) && --limit) 302 DELAY(delay); 303} 304 305static int 306sab82532_rxready(struct uart_bas *bas) 307{ 308 309 return ((uart_getreg(bas, SAB_STAR) & SAB_STAR_RFNE) != 0 ? 1 : 0); 310} 311 312static int 313sab82532_getc(struct uart_bas *bas, struct mtx *hwmtx) 314{ 315 int c, delay; 316 317 uart_lock(hwmtx); 318 319 /* 1/10th the time to transmit 1 character (estimate). */ 320 delay = sab82532_delay(bas); 321 322 while (!(uart_getreg(bas, SAB_STAR) & SAB_STAR_RFNE)) { 323 uart_unlock(hwmtx); 324 DELAY(delay); 325 uart_lock(hwmtx); 326 } 327 328 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 329 ; 330 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RFRD); 331 uart_barrier(bas); 332 333 while (!(uart_getreg(bas, SAB_ISR0) & SAB_ISR0_TCD)) 334 DELAY(delay); 335 336 c = uart_getreg(bas, SAB_RFIFO); 337 uart_barrier(bas); 338 339 /* Blow away everything left in the FIFO... */ 340 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 341 ; 342 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RMC); 343 uart_barrier(bas); 344 345 uart_unlock(hwmtx); 346 347 return (c); 348} 349 350/* 351 * High-level UART interface. 352 */ 353struct sab82532_softc { 354 struct uart_softc base; 355}; 356 357static int sab82532_bus_attach(struct uart_softc *); 358static int sab82532_bus_detach(struct uart_softc *); 359static int sab82532_bus_flush(struct uart_softc *, int); 360static int sab82532_bus_getsig(struct uart_softc *); 361static int sab82532_bus_ioctl(struct uart_softc *, int, intptr_t); 362static int sab82532_bus_ipend(struct uart_softc *); 363static int sab82532_bus_param(struct uart_softc *, int, int, int, int); 364static int sab82532_bus_probe(struct uart_softc *); 365static int sab82532_bus_receive(struct uart_softc *); 366static int sab82532_bus_setsig(struct uart_softc *, int); 367static int sab82532_bus_transmit(struct uart_softc *); 368static void sab82532_bus_grab(struct uart_softc *); 369static void sab82532_bus_ungrab(struct uart_softc *); 370 371static kobj_method_t sab82532_methods[] = { 372 KOBJMETHOD(uart_attach, sab82532_bus_attach), 373 KOBJMETHOD(uart_detach, sab82532_bus_detach), 374 KOBJMETHOD(uart_flush, sab82532_bus_flush), 375 KOBJMETHOD(uart_getsig, sab82532_bus_getsig), 376 KOBJMETHOD(uart_ioctl, sab82532_bus_ioctl), 377 KOBJMETHOD(uart_ipend, sab82532_bus_ipend), 378 KOBJMETHOD(uart_param, sab82532_bus_param), 379 KOBJMETHOD(uart_probe, sab82532_bus_probe), 380 KOBJMETHOD(uart_receive, sab82532_bus_receive), 381 KOBJMETHOD(uart_setsig, sab82532_bus_setsig), 382 KOBJMETHOD(uart_transmit, sab82532_bus_transmit), 383 KOBJMETHOD(uart_grab, sab82532_bus_grab), 384 KOBJMETHOD(uart_ungrab, sab82532_bus_ungrab), 385 { 0, 0 } 386}; 387 388struct uart_class uart_sab82532_class = { 389 "sab82532", 390 sab82532_methods, 391 sizeof(struct sab82532_softc), 392 .uc_ops = &uart_sab82532_ops, 393 .uc_range = 64, 394 .uc_rclk = DEFAULT_RCLK 395}; 396 397#define SIGCHG(c, i, s, d) \ 398 if (c) { \ 399 i |= (i & s) ? s : s | d; \ 400 } else { \ 401 i = (i & s) ? (i & ~s) | d : i; \ 402 } 403 404static int 405sab82532_bus_attach(struct uart_softc *sc) 406{ 407 struct uart_bas *bas; 408 uint8_t imr0, imr1; 409 410 bas = &sc->sc_bas; 411 if (sc->sc_sysdev == NULL) 412 sab82532_init(bas, 9600, 8, 1, UART_PARITY_NONE); 413 414 imr0 = SAB_IMR0_TCD|SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO| 415 SAB_IMR0_RPF; 416 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 417 imr1 = SAB_IMR1_BRKT|SAB_IMR1_ALLS|SAB_IMR1_CSC; 418 uart_setreg(bas, SAB_IMR1, 0xff & ~imr1); 419 uart_barrier(bas); 420 421 if (sc->sc_sysdev == NULL) 422 sab82532_bus_setsig(sc, SER_DDTR|SER_DRTS); 423 (void)sab82532_bus_getsig(sc); 424 return (0); 425} 426 427static int 428sab82532_bus_detach(struct uart_softc *sc) 429{ 430 struct uart_bas *bas; 431 432 bas = &sc->sc_bas; 433 uart_setreg(bas, SAB_IMR0, 0xff); 434 uart_setreg(bas, SAB_IMR1, 0xff); 435 uart_barrier(bas); 436 uart_getreg(bas, SAB_ISR0); 437 uart_getreg(bas, SAB_ISR1); 438 uart_barrier(bas); 439 uart_setreg(bas, SAB_CCR0, 0); 440 uart_barrier(bas); 441 return (0); 442} 443 444static int 445sab82532_bus_flush(struct uart_softc *sc, int what) 446{ 447 448 uart_lock(sc->sc_hwmtx); 449 sab82532_flush(&sc->sc_bas, what); 450 uart_unlock(sc->sc_hwmtx); 451 return (0); 452} 453 454static int 455sab82532_bus_getsig(struct uart_softc *sc) 456{ 457 struct uart_bas *bas; 458 uint32_t new, old, sig; 459 uint8_t pvr, star, vstr; 460 461 bas = &sc->sc_bas; 462 do { 463 old = sc->sc_hwsig; 464 sig = old; 465 uart_lock(sc->sc_hwmtx); 466 star = uart_getreg(bas, SAB_STAR); 467 SIGCHG(star & SAB_STAR_CTS, sig, SER_CTS, SER_DCTS); 468 vstr = uart_getreg(bas, SAB_VSTR); 469 SIGCHG(vstr & SAB_VSTR_CD, sig, SER_DCD, SER_DDCD); 470 pvr = ~uart_getreg(bas, SAB_PVR); 471 switch (bas->chan) { 472 case 1: 473 pvr &= SAB_PVR_DSR_A; 474 break; 475 case 2: 476 pvr &= SAB_PVR_DSR_B; 477 break; 478 } 479 SIGCHG(pvr, sig, SER_DSR, SER_DDSR); 480 uart_unlock(sc->sc_hwmtx); 481 new = sig & ~SER_MASK_DELTA; 482 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 483 return (sig); 484} 485 486static int 487sab82532_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 488{ 489 struct uart_bas *bas; 490 uint8_t dafo, mode; 491 int error; 492 493 bas = &sc->sc_bas; 494 error = 0; 495 uart_lock(sc->sc_hwmtx); 496 switch (request) { 497 case UART_IOCTL_BREAK: 498 dafo = uart_getreg(bas, SAB_DAFO); 499 if (data) 500 dafo |= SAB_DAFO_XBRK; 501 else 502 dafo &= ~SAB_DAFO_XBRK; 503 uart_setreg(bas, SAB_DAFO, dafo); 504 uart_barrier(bas); 505 break; 506 case UART_IOCTL_IFLOW: 507 mode = uart_getreg(bas, SAB_MODE); 508 if (data) { 509 mode &= ~SAB_MODE_RTS; 510 mode |= SAB_MODE_FRTS; 511 } else { 512 mode |= SAB_MODE_RTS; 513 mode &= ~SAB_MODE_FRTS; 514 } 515 uart_setreg(bas, SAB_MODE, mode); 516 uart_barrier(bas); 517 break; 518 case UART_IOCTL_OFLOW: 519 mode = uart_getreg(bas, SAB_MODE); 520 if (data) 521 mode &= ~SAB_MODE_FCTS; 522 else 523 mode |= SAB_MODE_FCTS; 524 uart_setreg(bas, SAB_MODE, mode); 525 uart_barrier(bas); 526 break; 527 default: 528 error = EINVAL; 529 break; 530 } 531 uart_unlock(sc->sc_hwmtx); 532 return (error); 533} 534 535static int 536sab82532_bus_ipend(struct uart_softc *sc) 537{ 538 struct uart_bas *bas; 539 int ipend; 540 uint8_t isr0, isr1; 541 542 bas = &sc->sc_bas; 543 uart_lock(sc->sc_hwmtx); 544 isr0 = uart_getreg(bas, SAB_ISR0); 545 isr1 = uart_getreg(bas, SAB_ISR1); 546 uart_barrier(bas); 547 if (isr0 & SAB_ISR0_TIME) { 548 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 549 ; 550 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RFRD); 551 uart_barrier(bas); 552 } 553 uart_unlock(sc->sc_hwmtx); 554 555 ipend = 0; 556 if (isr1 & SAB_ISR1_BRKT) 557 ipend |= SER_INT_BREAK; 558 if (isr0 & SAB_ISR0_RFO) 559 ipend |= SER_INT_OVERRUN; 560 if (isr0 & (SAB_ISR0_TCD|SAB_ISR0_RPF)) 561 ipend |= SER_INT_RXREADY; 562 if ((isr0 & SAB_ISR0_CDSC) || (isr1 & SAB_ISR1_CSC)) 563 ipend |= SER_INT_SIGCHG; 564 if (isr1 & SAB_ISR1_ALLS) 565 ipend |= SER_INT_TXIDLE; 566 567 return (ipend); 568} 569 570static int 571sab82532_bus_param(struct uart_softc *sc, int baudrate, int databits, 572 int stopbits, int parity) 573{ 574 struct uart_bas *bas; 575 int error; 576 577 bas = &sc->sc_bas; 578 uart_lock(sc->sc_hwmtx); 579 error = sab82532_param(bas, baudrate, databits, stopbits, parity); 580 uart_unlock(sc->sc_hwmtx); 581 return (error); 582} 583 584static int 585sab82532_bus_probe(struct uart_softc *sc) 586{ 587 char buf[80]; 588 const char *vstr; 589 int error; 590 char ch; 591 592 error = sab82532_probe(&sc->sc_bas); 593 if (error) 594 return (error); 595 596 sc->sc_rxfifosz = 32; 597 sc->sc_txfifosz = 32; 598 599 ch = sc->sc_bas.chan - 1 + 'A'; 600 601 switch (uart_getreg(&sc->sc_bas, SAB_VSTR) & SAB_VSTR_VMASK) { 602 case SAB_VSTR_V_1: 603 vstr = "v1"; 604 break; 605 case SAB_VSTR_V_2: 606 vstr = "v2"; 607 break; 608 case SAB_VSTR_V_32: 609 vstr = "v3.2"; 610 sc->sc_hwiflow = 0; /* CTS doesn't work with RFC:RFDF. */ 611 sc->sc_hwoflow = 1; 612 break; 613 default: 614 vstr = "v4?"; 615 break; 616 } 617 618 snprintf(buf, sizeof(buf), "SAB 82532 %s, channel %c", vstr, ch); 619 device_set_desc_copy(sc->sc_dev, buf); 620 return (0); 621} 622 623static int 624sab82532_bus_receive(struct uart_softc *sc) 625{ 626 struct uart_bas *bas; 627 int i, rbcl, xc; 628 uint8_t s; 629 630 bas = &sc->sc_bas; 631 uart_lock(sc->sc_hwmtx); 632 if (uart_getreg(bas, SAB_STAR) & SAB_STAR_RFNE) { 633 rbcl = uart_getreg(bas, SAB_RBCL) & 31; 634 if (rbcl == 0) 635 rbcl = 32; 636 for (i = 0; i < rbcl; i += 2) { 637 if (uart_rx_full(sc)) { 638 sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; 639 break; 640 } 641 xc = uart_getreg(bas, SAB_RFIFO); 642 s = uart_getreg(bas, SAB_RFIFO + 1); 643 if (s & SAB_RSTAT_FE) 644 xc |= UART_STAT_FRAMERR; 645 if (s & SAB_RSTAT_PE) 646 xc |= UART_STAT_PARERR; 647 uart_rx_put(sc, xc); 648 } 649 } 650 651 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 652 ; 653 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RMC); 654 uart_barrier(bas); 655 uart_unlock(sc->sc_hwmtx); 656 return (0); 657} 658 659static int 660sab82532_bus_setsig(struct uart_softc *sc, int sig) 661{ 662 struct uart_bas *bas; 663 uint32_t new, old; 664 uint8_t mode, pvr; 665 666 bas = &sc->sc_bas; 667 do { 668 old = sc->sc_hwsig; 669 new = old; 670 if (sig & SER_DDTR) { 671 SIGCHG(sig & SER_DTR, new, SER_DTR, 672 SER_DDTR); 673 } 674 if (sig & SER_DRTS) { 675 SIGCHG(sig & SER_RTS, new, SER_RTS, 676 SER_DRTS); 677 } 678 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 679 680 uart_lock(sc->sc_hwmtx); 681 /* Set DTR pin. */ 682 pvr = uart_getreg(bas, SAB_PVR); 683 switch (bas->chan) { 684 case 1: 685 if (new & SER_DTR) 686 pvr &= ~SAB_PVR_DTR_A; 687 else 688 pvr |= SAB_PVR_DTR_A; 689 break; 690 case 2: 691 if (new & SER_DTR) 692 pvr &= ~SAB_PVR_DTR_B; 693 else 694 pvr |= SAB_PVR_DTR_B; 695 break; 696 } 697 uart_setreg(bas, SAB_PVR, pvr); 698 699 /* Set RTS pin. */ 700 mode = uart_getreg(bas, SAB_MODE); 701 if (new & SER_RTS) 702 mode &= ~SAB_MODE_FRTS; 703 else 704 mode |= SAB_MODE_FRTS; 705 uart_setreg(bas, SAB_MODE, mode); 706 uart_barrier(bas); 707 uart_unlock(sc->sc_hwmtx); 708 return (0); 709} 710 711static int 712sab82532_bus_transmit(struct uart_softc *sc) 713{ 714 struct uart_bas *bas; 715 int i; 716 717 bas = &sc->sc_bas; 718 uart_lock(sc->sc_hwmtx); 719 while (!(uart_getreg(bas, SAB_STAR) & SAB_STAR_XFW)) 720 ; 721 for (i = 0; i < sc->sc_txdatasz; i++) 722 uart_setreg(bas, SAB_XFIFO + i, sc->sc_txbuf[i]); 723 uart_barrier(bas); 724 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 725 ; 726 uart_setreg(bas, SAB_CMDR, SAB_CMDR_XF); 727 sc->sc_txbusy = 1; 728 uart_unlock(sc->sc_hwmtx); 729 return (0); 730} 731 732static void 733sab82532_bus_grab(struct uart_softc *sc) 734{ 735 struct uart_bas *bas; 736 uint8_t imr0; 737 738 bas = &sc->sc_bas; 739 imr0 = SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO; /* No TCD or RPF */ 740 uart_lock(sc->sc_hwmtx); 741 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 742 uart_barrier(bas); 743 uart_unlock(sc->sc_hwmtx); 744} 745 746static void 747sab82532_bus_ungrab(struct uart_softc *sc) 748{ 749 struct uart_bas *bas; 750 uint8_t imr0; 751 752 bas = &sc->sc_bas; 753 imr0 = SAB_IMR0_TCD|SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO| 754 SAB_IMR0_RPF; 755 uart_lock(sc->sc_hwmtx); 756 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 757 uart_barrier(bas); 758 uart_unlock(sc->sc_hwmtx); 759} 760