Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/uart/uart_dev_sab82532.c
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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("$FreeBSD$"); 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 52 static int 53 sab82532_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 68 static int 69 sab82532_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 } 102 103 static void 104 sab82532_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 } 120 121 static int 122 sab82532_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 */ 172 static int sab82532_probe(struct uart_bas *bas); 173 static void sab82532_init(struct uart_bas *bas, int, int, int, int); 174 static void sab82532_term(struct uart_bas *bas); 175 static void sab82532_putc(struct uart_bas *bas, int); 176 static int sab82532_rxready(struct uart_bas *bas); 177 static int sab82532_getc(struct uart_bas *bas, struct mtx *); 178 179 static 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 }; 187 188 static int 189 sab82532_probe(struct uart_bas *bas) 190 { 191 192 return (0); 193 } 194 195 static void 196 sab82532_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 } 269 270 static void 271 sab82532_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 } 287 288 static void 289 sab82532_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 } 304 305 static int 306 sab82532_rxready(struct uart_bas *bas) 307 { 308 309 return ((uart_getreg(bas, SAB_STAR) & SAB_STAR_RFNE) != 0 ? 1 : 0); 310 } 311 312 static int 313 sab82532_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 */ 353 struct sab82532_softc { 354 struct uart_softc base; 355 }; 356 357 static int sab82532_bus_attach(struct uart_softc *); 358 static int sab82532_bus_detach(struct uart_softc *); 359 static int sab82532_bus_flush(struct uart_softc *, int); 360 static int sab82532_bus_getsig(struct uart_softc *); 361 static int sab82532_bus_ioctl(struct uart_softc *, int, intptr_t); 362 static int sab82532_bus_ipend(struct uart_softc *); 363 static int sab82532_bus_param(struct uart_softc *, int, int, int, int); 364 static int sab82532_bus_probe(struct uart_softc *); 365 static int sab82532_bus_receive(struct uart_softc *); 366 static int sab82532_bus_setsig(struct uart_softc *, int); 367 static int sab82532_bus_transmit(struct uart_softc *); 368 369 static kobj_method_t sab82532_methods[] = { 370 KOBJMETHOD(uart_attach, sab82532_bus_attach), 371 KOBJMETHOD(uart_detach, sab82532_bus_detach), 372 KOBJMETHOD(uart_flush, sab82532_bus_flush), 373 KOBJMETHOD(uart_getsig, sab82532_bus_getsig), 374 KOBJMETHOD(uart_ioctl, sab82532_bus_ioctl), 375 KOBJMETHOD(uart_ipend, sab82532_bus_ipend), 376 KOBJMETHOD(uart_param, sab82532_bus_param), 377 KOBJMETHOD(uart_probe, sab82532_bus_probe), 378 KOBJMETHOD(uart_receive, sab82532_bus_receive), 379 KOBJMETHOD(uart_setsig, sab82532_bus_setsig), 380 KOBJMETHOD(uart_transmit, sab82532_bus_transmit), 381 { 0, 0 } 382 }; 383 384 struct uart_class uart_sab82532_class = { 385 "sab82532", 386 sab82532_methods, 387 sizeof(struct sab82532_softc), 388 .uc_ops = &uart_sab82532_ops, 389 .uc_range = 64, 390 .uc_rclk = DEFAULT_RCLK 391 }; 392 393 #define SIGCHG(c, i, s, d) \ 394 if (c) { \ 395 i |= (i & s) ? s : s | d; \ 396 } else { \ 397 i = (i & s) ? (i & ~s) | d : i; \ 398 } 399 400 static int 401 sab82532_bus_attach(struct uart_softc *sc) 402 { 403 struct uart_bas *bas; 404 uint8_t imr0, imr1; 405 406 bas = &sc->sc_bas; 407 if (sc->sc_sysdev == NULL) 408 sab82532_init(bas, 9600, 8, 1, UART_PARITY_NONE); 409 410 sc->sc_rxfifosz = 32; 411 sc->sc_txfifosz = 32; 412 413 imr0 = SAB_IMR0_TCD|SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO| 414 SAB_IMR0_RPF; 415 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 416 imr1 = SAB_IMR1_BRKT|SAB_IMR1_ALLS|SAB_IMR1_CSC; 417 uart_setreg(bas, SAB_IMR1, 0xff & ~imr1); 418 uart_barrier(bas); 419 420 if (sc->sc_sysdev == NULL) 421 sab82532_bus_setsig(sc, SER_DDTR|SER_DRTS); 422 (void)sab82532_bus_getsig(sc); 423 return (0); 424 } 425 426 static int 427 sab82532_bus_detach(struct uart_softc *sc) 428 { 429 struct uart_bas *bas; 430 431 bas = &sc->sc_bas; 432 uart_setreg(bas, SAB_IMR0, 0xff); 433 uart_setreg(bas, SAB_IMR1, 0xff); 434 uart_barrier(bas); 435 uart_getreg(bas, SAB_ISR0); 436 uart_getreg(bas, SAB_ISR1); 437 uart_barrier(bas); 438 uart_setreg(bas, SAB_CCR0, 0); 439 uart_barrier(bas); 440 return (0); 441 } 442 443 static int 444 sab82532_bus_flush(struct uart_softc *sc, int what) 445 { 446 447 uart_lock(sc->sc_hwmtx); 448 sab82532_flush(&sc->sc_bas, what); 449 uart_unlock(sc->sc_hwmtx); 450 return (0); 451 } 452 453 static int 454 sab82532_bus_getsig(struct uart_softc *sc) 455 { 456 struct uart_bas *bas; 457 uint32_t new, old, sig; 458 uint8_t pvr, star, vstr; 459 460 bas = &sc->sc_bas; 461 do { 462 old = sc->sc_hwsig; 463 sig = old; 464 uart_lock(sc->sc_hwmtx); 465 star = uart_getreg(bas, SAB_STAR); 466 SIGCHG(star & SAB_STAR_CTS, sig, SER_CTS, SER_DCTS); 467 vstr = uart_getreg(bas, SAB_VSTR); 468 SIGCHG(vstr & SAB_VSTR_CD, sig, SER_DCD, SER_DDCD); 469 pvr = ~uart_getreg(bas, SAB_PVR); 470 switch (bas->chan) { 471 case 1: 472 pvr &= SAB_PVR_DSR_A; 473 break; 474 case 2: 475 pvr &= SAB_PVR_DSR_B; 476 break; 477 } 478 SIGCHG(pvr, sig, SER_DSR, SER_DDSR); 479 uart_unlock(sc->sc_hwmtx); 480 new = sig & ~SER_MASK_DELTA; 481 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 482 return (sig); 483 } 484 485 static int 486 sab82532_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 487 { 488 struct uart_bas *bas; 489 uint8_t dafo, mode; 490 int error; 491 492 bas = &sc->sc_bas; 493 error = 0; 494 uart_lock(sc->sc_hwmtx); 495 switch (request) { 496 case UART_IOCTL_BREAK: 497 dafo = uart_getreg(bas, SAB_DAFO); 498 if (data) 499 dafo |= SAB_DAFO_XBRK; 500 else 501 dafo &= ~SAB_DAFO_XBRK; 502 uart_setreg(bas, SAB_DAFO, dafo); 503 uart_barrier(bas); 504 break; 505 case UART_IOCTL_IFLOW: 506 mode = uart_getreg(bas, SAB_MODE); 507 if (data) { 508 mode &= ~SAB_MODE_RTS; 509 mode |= SAB_MODE_FRTS; 510 } else { 511 mode |= SAB_MODE_RTS; 512 mode &= ~SAB_MODE_FRTS; 513 } 514 uart_setreg(bas, SAB_MODE, mode); 515 uart_barrier(bas); 516 break; 517 case UART_IOCTL_OFLOW: 518 mode = uart_getreg(bas, SAB_MODE); 519 if (data) 520 mode &= ~SAB_MODE_FCTS; 521 else 522 mode |= SAB_MODE_FCTS; 523 uart_setreg(bas, SAB_MODE, mode); 524 uart_barrier(bas); 525 break; 526 default: 527 error = EINVAL; 528 break; 529 } 530 uart_unlock(sc->sc_hwmtx); 531 return (error); 532 } 533 534 static int 535 sab82532_bus_ipend(struct uart_softc *sc) 536 { 537 struct uart_bas *bas; 538 int ipend; 539 uint8_t isr0, isr1; 540 541 bas = &sc->sc_bas; 542 uart_lock(sc->sc_hwmtx); 543 isr0 = uart_getreg(bas, SAB_ISR0); 544 isr1 = uart_getreg(bas, SAB_ISR1); 545 uart_barrier(bas); 546 if (isr0 & SAB_ISR0_TIME) { 547 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 548 ; 549 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RFRD); 550 uart_barrier(bas); 551 } 552 uart_unlock(sc->sc_hwmtx); 553 554 ipend = 0; 555 if (isr1 & SAB_ISR1_BRKT) 556 ipend |= SER_INT_BREAK; 557 if (isr0 & SAB_ISR0_RFO) 558 ipend |= SER_INT_OVERRUN; 559 if (isr0 & (SAB_ISR0_TCD|SAB_ISR0_RPF)) 560 ipend |= SER_INT_RXREADY; 561 if ((isr0 & SAB_ISR0_CDSC) || (isr1 & SAB_ISR1_CSC)) 562 ipend |= SER_INT_SIGCHG; 563 if (isr1 & SAB_ISR1_ALLS) 564 ipend |= SER_INT_TXIDLE; 565 566 return (ipend); 567 } 568 569 static int 570 sab82532_bus_param(struct uart_softc *sc, int baudrate, int databits, 571 int stopbits, int parity) 572 { 573 struct uart_bas *bas; 574 int error; 575 576 bas = &sc->sc_bas; 577 uart_lock(sc->sc_hwmtx); 578 error = sab82532_param(bas, baudrate, databits, stopbits, parity); 579 uart_unlock(sc->sc_hwmtx); 580 return (error); 581 } 582 583 static int 584 sab82532_bus_probe(struct uart_softc *sc) 585 { 586 char buf[80]; 587 const char *vstr; 588 int error; 589 char ch; 590 591 error = sab82532_probe(&sc->sc_bas); 592 if (error) 593 return (error); 594 595 ch = sc->sc_bas.chan - 1 + 'A'; 596 597 switch (uart_getreg(&sc->sc_bas, SAB_VSTR) & SAB_VSTR_VMASK) { 598 case SAB_VSTR_V_1: 599 vstr = "v1"; 600 break; 601 case SAB_VSTR_V_2: 602 vstr = "v2"; 603 break; 604 case SAB_VSTR_V_32: 605 vstr = "v3.2"; 606 sc->sc_hwiflow = 0; /* CTS doesn't work with RFC:RFDF. */ 607 sc->sc_hwoflow = 1; 608 break; 609 default: 610 vstr = "v4?"; 611 break; 612 } 613 614 snprintf(buf, sizeof(buf), "SAB 82532 %s, channel %c", vstr, ch); 615 device_set_desc_copy(sc->sc_dev, buf); 616 return (0); 617 } 618 619 static int 620 sab82532_bus_receive(struct uart_softc *sc) 621 { 622 struct uart_bas *bas; 623 int i, rbcl, xc; 624 uint8_t s; 625 626 bas = &sc->sc_bas; 627 uart_lock(sc->sc_hwmtx); 628 if (uart_getreg(bas, SAB_STAR) & SAB_STAR_RFNE) { 629 rbcl = uart_getreg(bas, SAB_RBCL) & 31; 630 if (rbcl == 0) 631 rbcl = 32; 632 for (i = 0; i < rbcl; i += 2) { 633 if (uart_rx_full(sc)) { 634 sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; 635 break; 636 } 637 xc = uart_getreg(bas, SAB_RFIFO); 638 s = uart_getreg(bas, SAB_RFIFO + 1); 639 if (s & SAB_RSTAT_FE) 640 xc |= UART_STAT_FRAMERR; 641 if (s & SAB_RSTAT_PE) 642 xc |= UART_STAT_PARERR; 643 uart_rx_put(sc, xc); 644 } 645 } 646 647 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 648 ; 649 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RMC); 650 uart_barrier(bas); 651 uart_unlock(sc->sc_hwmtx); 652 return (0); 653 } 654 655 static int 656 sab82532_bus_setsig(struct uart_softc *sc, int sig) 657 { 658 struct uart_bas *bas; 659 uint32_t new, old; 660 uint8_t mode, pvr; 661 662 bas = &sc->sc_bas; 663 do { 664 old = sc->sc_hwsig; 665 new = old; 666 if (sig & SER_DDTR) { 667 SIGCHG(sig & SER_DTR, new, SER_DTR, 668 SER_DDTR); 669 } 670 if (sig & SER_DRTS) { 671 SIGCHG(sig & SER_RTS, new, SER_RTS, 672 SER_DRTS); 673 } 674 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 675 676 uart_lock(sc->sc_hwmtx); 677 /* Set DTR pin. */ 678 pvr = uart_getreg(bas, SAB_PVR); 679 switch (bas->chan) { 680 case 1: 681 if (new & SER_DTR) 682 pvr &= ~SAB_PVR_DTR_A; 683 else 684 pvr |= SAB_PVR_DTR_A; 685 break; 686 case 2: 687 if (new & SER_DTR) 688 pvr &= ~SAB_PVR_DTR_B; 689 else 690 pvr |= SAB_PVR_DTR_B; 691 break; 692 } 693 uart_setreg(bas, SAB_PVR, pvr); 694 695 /* Set RTS pin. */ 696 mode = uart_getreg(bas, SAB_MODE); 697 if (new & SER_RTS) 698 mode &= ~SAB_MODE_FRTS; 699 else 700 mode |= SAB_MODE_FRTS; 701 uart_setreg(bas, SAB_MODE, mode); 702 uart_barrier(bas); 703 uart_unlock(sc->sc_hwmtx); 704 return (0); 705 } 706 707 static int 708 sab82532_bus_transmit(struct uart_softc *sc) 709 { 710 struct uart_bas *bas; 711 int i; 712 713 bas = &sc->sc_bas; 714 uart_lock(sc->sc_hwmtx); 715 while (!(uart_getreg(bas, SAB_STAR) & SAB_STAR_XFW)) 716 ; 717 for (i = 0; i < sc->sc_txdatasz; i++) 718 uart_setreg(bas, SAB_XFIFO + i, sc->sc_txbuf[i]); 719 uart_barrier(bas); 720 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 721 ; 722 uart_setreg(bas, SAB_CMDR, SAB_CMDR_XF); 723 sc->sc_txbusy = 1; 724 uart_unlock(sc->sc_hwmtx); 725 return (0); 726 }
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