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 static void sab82532_bus_grab(struct uart_softc *); 369 static void sab82532_bus_ungrab(struct uart_softc *); 370 371 static 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 }; 387 388 struct 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 .uc_rshift = 0 396 }; 397 398 #define SIGCHG(c, i, s, d) \ 399 if (c) { \ 400 i |= (i & s) ? s : s | d; \ 401 } else { \ 402 i = (i & s) ? (i & ~s) | d : i; \ 403 } 404 405 static int 406 sab82532_bus_attach(struct uart_softc *sc) 407 { 408 struct uart_bas *bas; 409 uint8_t imr0, imr1; 410 411 bas = &sc->sc_bas; 412 if (sc->sc_sysdev == NULL) 413 sab82532_init(bas, 9600, 8, 1, UART_PARITY_NONE); 414 415 imr0 = SAB_IMR0_TCD|SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO| 416 SAB_IMR0_RPF; 417 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 418 imr1 = SAB_IMR1_BRKT|SAB_IMR1_ALLS|SAB_IMR1_CSC; 419 uart_setreg(bas, SAB_IMR1, 0xff & ~imr1); 420 uart_barrier(bas); 421 422 if (sc->sc_sysdev == NULL) 423 sab82532_bus_setsig(sc, SER_DDTR|SER_DRTS); 424 (void)sab82532_bus_getsig(sc); 425 return (0); 426 } 427 428 static int 429 sab82532_bus_detach(struct uart_softc *sc) 430 { 431 struct uart_bas *bas; 432 433 bas = &sc->sc_bas; 434 uart_setreg(bas, SAB_IMR0, 0xff); 435 uart_setreg(bas, SAB_IMR1, 0xff); 436 uart_barrier(bas); 437 uart_getreg(bas, SAB_ISR0); 438 uart_getreg(bas, SAB_ISR1); 439 uart_barrier(bas); 440 uart_setreg(bas, SAB_CCR0, 0); 441 uart_barrier(bas); 442 return (0); 443 } 444 445 static int 446 sab82532_bus_flush(struct uart_softc *sc, int what) 447 { 448 449 uart_lock(sc->sc_hwmtx); 450 sab82532_flush(&sc->sc_bas, what); 451 uart_unlock(sc->sc_hwmtx); 452 return (0); 453 } 454 455 static int 456 sab82532_bus_getsig(struct uart_softc *sc) 457 { 458 struct uart_bas *bas; 459 uint32_t new, old, sig; 460 uint8_t pvr, star, vstr; 461 462 bas = &sc->sc_bas; 463 do { 464 old = sc->sc_hwsig; 465 sig = old; 466 uart_lock(sc->sc_hwmtx); 467 star = uart_getreg(bas, SAB_STAR); 468 SIGCHG(star & SAB_STAR_CTS, sig, SER_CTS, SER_DCTS); 469 vstr = uart_getreg(bas, SAB_VSTR); 470 SIGCHG(vstr & SAB_VSTR_CD, sig, SER_DCD, SER_DDCD); 471 pvr = ~uart_getreg(bas, SAB_PVR); 472 switch (bas->chan) { 473 case 1: 474 pvr &= SAB_PVR_DSR_A; 475 break; 476 case 2: 477 pvr &= SAB_PVR_DSR_B; 478 break; 479 } 480 SIGCHG(pvr, sig, SER_DSR, SER_DDSR); 481 uart_unlock(sc->sc_hwmtx); 482 new = sig & ~SER_MASK_DELTA; 483 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 484 return (sig); 485 } 486 487 static int 488 sab82532_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 489 { 490 struct uart_bas *bas; 491 uint8_t dafo, mode; 492 int error; 493 494 bas = &sc->sc_bas; 495 error = 0; 496 uart_lock(sc->sc_hwmtx); 497 switch (request) { 498 case UART_IOCTL_BREAK: 499 dafo = uart_getreg(bas, SAB_DAFO); 500 if (data) 501 dafo |= SAB_DAFO_XBRK; 502 else 503 dafo &= ~SAB_DAFO_XBRK; 504 uart_setreg(bas, SAB_DAFO, dafo); 505 uart_barrier(bas); 506 break; 507 case UART_IOCTL_IFLOW: 508 mode = uart_getreg(bas, SAB_MODE); 509 if (data) { 510 mode &= ~SAB_MODE_RTS; 511 mode |= SAB_MODE_FRTS; 512 } else { 513 mode |= SAB_MODE_RTS; 514 mode &= ~SAB_MODE_FRTS; 515 } 516 uart_setreg(bas, SAB_MODE, mode); 517 uart_barrier(bas); 518 break; 519 case UART_IOCTL_OFLOW: 520 mode = uart_getreg(bas, SAB_MODE); 521 if (data) 522 mode &= ~SAB_MODE_FCTS; 523 else 524 mode |= SAB_MODE_FCTS; 525 uart_setreg(bas, SAB_MODE, mode); 526 uart_barrier(bas); 527 break; 528 default: 529 error = EINVAL; 530 break; 531 } 532 uart_unlock(sc->sc_hwmtx); 533 return (error); 534 } 535 536 static int 537 sab82532_bus_ipend(struct uart_softc *sc) 538 { 539 struct uart_bas *bas; 540 int ipend; 541 uint8_t isr0, isr1; 542 543 bas = &sc->sc_bas; 544 uart_lock(sc->sc_hwmtx); 545 isr0 = uart_getreg(bas, SAB_ISR0); 546 isr1 = uart_getreg(bas, SAB_ISR1); 547 uart_barrier(bas); 548 if (isr0 & SAB_ISR0_TIME) { 549 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 550 ; 551 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RFRD); 552 uart_barrier(bas); 553 } 554 uart_unlock(sc->sc_hwmtx); 555 556 ipend = 0; 557 if (isr1 & SAB_ISR1_BRKT) 558 ipend |= SER_INT_BREAK; 559 if (isr0 & SAB_ISR0_RFO) 560 ipend |= SER_INT_OVERRUN; 561 if (isr0 & (SAB_ISR0_TCD|SAB_ISR0_RPF)) 562 ipend |= SER_INT_RXREADY; 563 if ((isr0 & SAB_ISR0_CDSC) || (isr1 & SAB_ISR1_CSC)) 564 ipend |= SER_INT_SIGCHG; 565 if (isr1 & SAB_ISR1_ALLS) 566 ipend |= SER_INT_TXIDLE; 567 568 return (ipend); 569 } 570 571 static int 572 sab82532_bus_param(struct uart_softc *sc, int baudrate, int databits, 573 int stopbits, int parity) 574 { 575 struct uart_bas *bas; 576 int error; 577 578 bas = &sc->sc_bas; 579 uart_lock(sc->sc_hwmtx); 580 error = sab82532_param(bas, baudrate, databits, stopbits, parity); 581 uart_unlock(sc->sc_hwmtx); 582 return (error); 583 } 584 585 static int 586 sab82532_bus_probe(struct uart_softc *sc) 587 { 588 char buf[80]; 589 const char *vstr; 590 int error; 591 char ch; 592 593 error = sab82532_probe(&sc->sc_bas); 594 if (error) 595 return (error); 596 597 sc->sc_rxfifosz = 32; 598 sc->sc_txfifosz = 32; 599 600 ch = sc->sc_bas.chan - 1 + 'A'; 601 602 switch (uart_getreg(&sc->sc_bas, SAB_VSTR) & SAB_VSTR_VMASK) { 603 case SAB_VSTR_V_1: 604 vstr = "v1"; 605 break; 606 case SAB_VSTR_V_2: 607 vstr = "v2"; 608 break; 609 case SAB_VSTR_V_32: 610 vstr = "v3.2"; 611 sc->sc_hwiflow = 0; /* CTS doesn't work with RFC:RFDF. */ 612 sc->sc_hwoflow = 1; 613 break; 614 default: 615 vstr = "v4?"; 616 break; 617 } 618 619 snprintf(buf, sizeof(buf), "SAB 82532 %s, channel %c", vstr, ch); 620 device_set_desc_copy(sc->sc_dev, buf); 621 return (0); 622 } 623 624 static int 625 sab82532_bus_receive(struct uart_softc *sc) 626 { 627 struct uart_bas *bas; 628 int i, rbcl, xc; 629 uint8_t s; 630 631 bas = &sc->sc_bas; 632 uart_lock(sc->sc_hwmtx); 633 if (uart_getreg(bas, SAB_STAR) & SAB_STAR_RFNE) { 634 rbcl = uart_getreg(bas, SAB_RBCL) & 31; 635 if (rbcl == 0) 636 rbcl = 32; 637 for (i = 0; i < rbcl; i += 2) { 638 if (uart_rx_full(sc)) { 639 sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; 640 break; 641 } 642 xc = uart_getreg(bas, SAB_RFIFO); 643 s = uart_getreg(bas, SAB_RFIFO + 1); 644 if (s & SAB_RSTAT_FE) 645 xc |= UART_STAT_FRAMERR; 646 if (s & SAB_RSTAT_PE) 647 xc |= UART_STAT_PARERR; 648 uart_rx_put(sc, xc); 649 } 650 } 651 652 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 653 ; 654 uart_setreg(bas, SAB_CMDR, SAB_CMDR_RMC); 655 uart_barrier(bas); 656 uart_unlock(sc->sc_hwmtx); 657 return (0); 658 } 659 660 static int 661 sab82532_bus_setsig(struct uart_softc *sc, int sig) 662 { 663 struct uart_bas *bas; 664 uint32_t new, old; 665 uint8_t mode, pvr; 666 667 bas = &sc->sc_bas; 668 do { 669 old = sc->sc_hwsig; 670 new = old; 671 if (sig & SER_DDTR) { 672 SIGCHG(sig & SER_DTR, new, SER_DTR, 673 SER_DDTR); 674 } 675 if (sig & SER_DRTS) { 676 SIGCHG(sig & SER_RTS, new, SER_RTS, 677 SER_DRTS); 678 } 679 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 680 681 uart_lock(sc->sc_hwmtx); 682 /* Set DTR pin. */ 683 pvr = uart_getreg(bas, SAB_PVR); 684 switch (bas->chan) { 685 case 1: 686 if (new & SER_DTR) 687 pvr &= ~SAB_PVR_DTR_A; 688 else 689 pvr |= SAB_PVR_DTR_A; 690 break; 691 case 2: 692 if (new & SER_DTR) 693 pvr &= ~SAB_PVR_DTR_B; 694 else 695 pvr |= SAB_PVR_DTR_B; 696 break; 697 } 698 uart_setreg(bas, SAB_PVR, pvr); 699 700 /* Set RTS pin. */ 701 mode = uart_getreg(bas, SAB_MODE); 702 if (new & SER_RTS) 703 mode &= ~SAB_MODE_FRTS; 704 else 705 mode |= SAB_MODE_FRTS; 706 uart_setreg(bas, SAB_MODE, mode); 707 uart_barrier(bas); 708 uart_unlock(sc->sc_hwmtx); 709 return (0); 710 } 711 712 static int 713 sab82532_bus_transmit(struct uart_softc *sc) 714 { 715 struct uart_bas *bas; 716 int i; 717 718 bas = &sc->sc_bas; 719 uart_lock(sc->sc_hwmtx); 720 while (!(uart_getreg(bas, SAB_STAR) & SAB_STAR_XFW)) 721 ; 722 for (i = 0; i < sc->sc_txdatasz; i++) 723 uart_setreg(bas, SAB_XFIFO + i, sc->sc_txbuf[i]); 724 uart_barrier(bas); 725 while (uart_getreg(bas, SAB_STAR) & SAB_STAR_CEC) 726 ; 727 uart_setreg(bas, SAB_CMDR, SAB_CMDR_XF); 728 sc->sc_txbusy = 1; 729 uart_unlock(sc->sc_hwmtx); 730 return (0); 731 } 732 733 static void 734 sab82532_bus_grab(struct uart_softc *sc) 735 { 736 struct uart_bas *bas; 737 uint8_t imr0; 738 739 bas = &sc->sc_bas; 740 imr0 = SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO; /* No TCD or RPF */ 741 uart_lock(sc->sc_hwmtx); 742 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 743 uart_barrier(bas); 744 uart_unlock(sc->sc_hwmtx); 745 } 746 747 static void 748 sab82532_bus_ungrab(struct uart_softc *sc) 749 { 750 struct uart_bas *bas; 751 uint8_t imr0; 752 753 bas = &sc->sc_bas; 754 imr0 = SAB_IMR0_TCD|SAB_IMR0_TIME|SAB_IMR0_CDSC|SAB_IMR0_RFO| 755 SAB_IMR0_RPF; 756 uart_lock(sc->sc_hwmtx); 757 uart_setreg(bas, SAB_IMR0, 0xff & ~imr0); 758 uart_barrier(bas); 759 uart_unlock(sc->sc_hwmtx); 760 } 761