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sys/arm/at91/uart_dev_at91usart.c
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1 /*- 2 * Copyright (c) 2005 M. Warner Losh 3 * Copyright (c) 2005 Olivier Houchard 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: releng/7.3/sys/arm/at91/uart_dev_at91usart.c 196431 2009-08-22 09:17:49Z stas $"); 30 31 #include "opt_comconsole.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/conf.h> 37 #include <sys/cons.h> 38 #include <sys/tty.h> 39 #include <machine/bus.h> 40 41 #include <dev/uart/uart.h> 42 #include <dev/uart/uart_cpu.h> 43 #include <dev/uart/uart_bus.h> 44 #include <arm/at91/at91rm92reg.h> 45 #include <arm/at91/at91_usartreg.h> 46 #include <arm/at91/at91_pdcreg.h> 47 48 #include "uart_if.h" 49 50 #define DEFAULT_RCLK AT91C_MASTER_CLOCK 51 #define USART_BUFFER_SIZE 128 52 53 /* 54 * High-level UART interface. 55 */ 56 struct at91_usart_rx { 57 bus_addr_t pa; 58 uint8_t buffer[USART_BUFFER_SIZE]; 59 bus_dmamap_t map; 60 }; 61 62 struct at91_usart_softc { 63 struct uart_softc base; 64 bus_dma_tag_t dmatag; /* bus dma tag for mbufs */ 65 bus_dmamap_t tx_map; 66 uint32_t flags; 67 #define HAS_TIMEOUT 1 68 struct at91_usart_rx ping_pong[2]; 69 struct at91_usart_rx *ping; 70 struct at91_usart_rx *pong; 71 }; 72 73 #define RD4(bas, reg) \ 74 bus_space_read_4((bas)->bst, (bas)->bsh, uart_regofs(bas, reg)) 75 #define WR4(bas, reg, value) \ 76 bus_space_write_4((bas)->bst, (bas)->bsh, uart_regofs(bas, reg), value) 77 78 #define SIGCHG(c, i, s, d) \ 79 do { \ 80 if (c) { \ 81 i |= (i & s) ? s : s | d; \ 82 } else { \ 83 i = (i & s) ? (i & ~s) | d : i; \ 84 } \ 85 } while (0); 86 87 #define BAUD2DIVISOR(b) \ 88 ((((DEFAULT_RCLK * 10) / ((b) * 16)) + 5) / 10) 89 90 /* 91 * Low-level UART interface. 92 */ 93 static int at91_usart_probe(struct uart_bas *bas); 94 static void at91_usart_init(struct uart_bas *bas, int, int, int, int); 95 static void at91_usart_term(struct uart_bas *bas); 96 static void at91_usart_putc(struct uart_bas *bas, int); 97 static int at91_usart_rxready(struct uart_bas *bas); 98 static int at91_usart_getc(struct uart_bas *bas, struct mtx *mtx); 99 100 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs; 101 102 static int 103 at91_usart_param(struct uart_bas *bas, int baudrate, int databits, 104 int stopbits, int parity) 105 { 106 uint32_t mr; 107 108 /* 109 * Assume 3-write RS-232 configuration. 110 * XXX Not sure how uart will present the other modes to us, so 111 * XXX they are unimplemented. maybe ioctl? 112 */ 113 mr = USART_MR_MODE_NORMAL; 114 mr |= USART_MR_USCLKS_MCK; /* Assume MCK */ 115 116 /* 117 * Or in the databits requested 118 */ 119 if (databits < 9) 120 mr &= ~USART_MR_MODE9; 121 switch (databits) { 122 case 5: 123 mr |= USART_MR_CHRL_5BITS; 124 break; 125 case 6: 126 mr |= USART_MR_CHRL_6BITS; 127 break; 128 case 7: 129 mr |= USART_MR_CHRL_7BITS; 130 break; 131 case 8: 132 mr |= USART_MR_CHRL_8BITS; 133 break; 134 case 9: 135 mr |= USART_MR_CHRL_8BITS | USART_MR_MODE9; 136 break; 137 default: 138 return (EINVAL); 139 } 140 141 /* 142 * Or in the parity 143 */ 144 switch (parity) { 145 case UART_PARITY_NONE: 146 mr |= USART_MR_PAR_NONE; 147 break; 148 case UART_PARITY_ODD: 149 mr |= USART_MR_PAR_ODD; 150 break; 151 case UART_PARITY_EVEN: 152 mr |= USART_MR_PAR_EVEN; 153 break; 154 case UART_PARITY_MARK: 155 mr |= USART_MR_PAR_MARK; 156 break; 157 case UART_PARITY_SPACE: 158 mr |= USART_MR_PAR_SPACE; 159 break; 160 default: 161 return (EINVAL); 162 } 163 164 /* 165 * Or in the stop bits. Note: The hardware supports 1.5 stop 166 * bits in async mode, but there's no way to specify that 167 * AFAICT. Instead, rely on the convention documented at 168 * http://www.lammertbies.nl/comm/info/RS-232_specs.html which 169 * states that 1.5 stop bits are used for 5 bit bytes and 170 * 2 stop bits only for longer bytes. 171 */ 172 if (stopbits == 1) 173 mr |= USART_MR_NBSTOP_1; 174 else if (databits > 5) 175 mr |= USART_MR_NBSTOP_2; 176 else 177 mr |= USART_MR_NBSTOP_1_5; 178 179 /* 180 * We want normal plumbing mode too, none of this fancy 181 * loopback or echo mode. 182 */ 183 mr |= USART_MR_CHMODE_NORMAL; 184 185 mr &= ~USART_MR_MSBF; /* lsb first */ 186 mr &= ~USART_MR_CKLO_SCK; /* Don't drive SCK */ 187 188 WR4(bas, USART_MR, mr); 189 190 /* 191 * Set the baud rate 192 */ 193 WR4(bas, USART_BRGR, BAUD2DIVISOR(baudrate)); 194 195 /* XXX Need to take possible synchronous mode into account */ 196 return (0); 197 } 198 199 static struct uart_ops at91_usart_ops = { 200 .probe = at91_usart_probe, 201 .init = at91_usart_init, 202 .term = at91_usart_term, 203 .putc = at91_usart_putc, 204 .rxready = at91_usart_rxready, 205 .getc = at91_usart_getc, 206 }; 207 208 static int 209 at91_usart_probe(struct uart_bas *bas) 210 { 211 /* We know that this is always here */ 212 return (0); 213 } 214 215 /* 216 * Initialize this device for use as a console. 217 */ 218 static void 219 at91_usart_init(struct uart_bas *bas, int baudrate, int databits, int stopbits, 220 int parity) 221 { 222 223 at91_usart_param(bas, baudrate, databits, stopbits, parity); 224 225 /* Reset the rx and tx buffers and turn on rx and tx */ 226 WR4(bas, USART_CR, USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX); 227 WR4(bas, USART_CR, USART_CR_RXEN | USART_CR_TXEN); 228 WR4(bas, USART_IDR, 0xffffffff); 229 } 230 231 /* 232 * Free resources now that we're no longer the console. This appears to 233 * be never called, and I'm unsure quite what to do if I am called. 234 */ 235 static void 236 at91_usart_term(struct uart_bas *bas) 237 { 238 /* XXX */ 239 } 240 241 /* 242 * Put a character of console output (so we do it here polling rather than 243 * interrutp driven). 244 */ 245 static void 246 at91_usart_putc(struct uart_bas *bas, int c) 247 { 248 249 while (!(RD4(bas, USART_CSR) & USART_CSR_TXRDY)) 250 continue; 251 WR4(bas, USART_THR, c); 252 } 253 254 /* 255 * Check for a character available. 256 */ 257 static int 258 at91_usart_rxready(struct uart_bas *bas) 259 { 260 261 return ((RD4(bas, USART_CSR) & USART_CSR_RXRDY) != 0 ? 1 : 0); 262 } 263 264 /* 265 * Block waiting for a character. 266 */ 267 static int 268 at91_usart_getc(struct uart_bas *bas, struct mtx *mtx) 269 { 270 int c; 271 272 while (!(RD4(bas, USART_CSR) & USART_CSR_RXRDY)) 273 continue; 274 c = RD4(bas, USART_RHR); 275 c &= 0xff; 276 return (c); 277 } 278 279 static int at91_usart_bus_probe(struct uart_softc *sc); 280 static int at91_usart_bus_attach(struct uart_softc *sc); 281 static int at91_usart_bus_flush(struct uart_softc *, int); 282 static int at91_usart_bus_getsig(struct uart_softc *); 283 static int at91_usart_bus_ioctl(struct uart_softc *, int, intptr_t); 284 static int at91_usart_bus_ipend(struct uart_softc *); 285 static int at91_usart_bus_param(struct uart_softc *, int, int, int, int); 286 static int at91_usart_bus_receive(struct uart_softc *); 287 static int at91_usart_bus_setsig(struct uart_softc *, int); 288 static int at91_usart_bus_transmit(struct uart_softc *); 289 290 static kobj_method_t at91_usart_methods[] = { 291 KOBJMETHOD(uart_probe, at91_usart_bus_probe), 292 KOBJMETHOD(uart_attach, at91_usart_bus_attach), 293 KOBJMETHOD(uart_flush, at91_usart_bus_flush), 294 KOBJMETHOD(uart_getsig, at91_usart_bus_getsig), 295 KOBJMETHOD(uart_ioctl, at91_usart_bus_ioctl), 296 KOBJMETHOD(uart_ipend, at91_usart_bus_ipend), 297 KOBJMETHOD(uart_param, at91_usart_bus_param), 298 KOBJMETHOD(uart_receive, at91_usart_bus_receive), 299 KOBJMETHOD(uart_setsig, at91_usart_bus_setsig), 300 KOBJMETHOD(uart_transmit, at91_usart_bus_transmit), 301 302 { 0, 0 } 303 }; 304 305 int 306 at91_usart_bus_probe(struct uart_softc *sc) 307 { 308 309 sc->sc_txfifosz = USART_BUFFER_SIZE; 310 sc->sc_rxfifosz = USART_BUFFER_SIZE; 311 sc->sc_hwiflow = 0; 312 return (0); 313 } 314 315 #ifndef SKYEYE_WORKAROUNDS 316 static void 317 at91_getaddr(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 318 { 319 if (error != 0) 320 return; 321 *(bus_addr_t *)arg = segs[0].ds_addr; 322 } 323 #endif 324 325 static int 326 at91_usart_bus_attach(struct uart_softc *sc) 327 { 328 #ifndef SKYEYE_WORKAROUNDS 329 int err; 330 int i; 331 #endif 332 uint32_t cr; 333 struct at91_usart_softc *atsc; 334 335 atsc = (struct at91_usart_softc *)sc; 336 337 /* 338 * See if we have a TIMEOUT bit. We disable all interrupts as 339 * a side effect. Boot loaders may have enabled them. Since 340 * a TIMEOUT interrupt can't happen without other setup, the 341 * apparent race here can't actually happen. 342 */ 343 WR4(&sc->sc_bas, USART_IDR, 0xffffffff); 344 WR4(&sc->sc_bas, USART_IER, USART_CSR_TIMEOUT); 345 if (RD4(&sc->sc_bas, USART_IMR) & USART_CSR_TIMEOUT) 346 atsc->flags |= HAS_TIMEOUT; 347 WR4(&sc->sc_bas, USART_IDR, 0xffffffff); 348 349 #ifndef SKYEYE_WORKAROUNDS 350 /* 351 * Allocate DMA tags and maps 352 */ 353 err = bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT, 354 BUS_SPACE_MAXADDR, NULL, NULL, USART_BUFFER_SIZE, 1, 355 USART_BUFFER_SIZE, BUS_DMA_ALLOCNOW, NULL, NULL, &atsc->dmatag); 356 if (err != 0) 357 goto errout; 358 err = bus_dmamap_create(atsc->dmatag, 0, &atsc->tx_map); 359 if (err != 0) 360 goto errout; 361 if (atsc->flags & HAS_TIMEOUT) { 362 for (i = 0; i < 2; i++) { 363 err = bus_dmamap_create(atsc->dmatag, 0, 364 &atsc->ping_pong[i].map); 365 if (err != 0) 366 goto errout; 367 err = bus_dmamap_load(atsc->dmatag, 368 atsc->ping_pong[i].map, 369 atsc->ping_pong[i].buffer, sc->sc_rxfifosz, 370 at91_getaddr, &atsc->ping_pong[i].pa, 0); 371 if (err != 0) 372 goto errout; 373 bus_dmamap_sync(atsc->dmatag, atsc->ping_pong[i].map, 374 BUS_DMASYNC_PREREAD); 375 } 376 atsc->ping = &atsc->ping_pong[0]; 377 atsc->pong = &atsc->ping_pong[1]; 378 } 379 #endif 380 381 /* 382 * Prime the pump with the RX buffer. We use two 64 byte bounce 383 * buffers here to avoid data overflow. 384 */ 385 386 /* Turn on rx and tx */ 387 cr = USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX; 388 WR4(&sc->sc_bas, USART_CR, cr); 389 WR4(&sc->sc_bas, USART_CR, USART_CR_RXEN | USART_CR_TXEN); 390 391 /* 392 * Setup the PDC to receive data. We use the ping-pong buffers 393 * so that we can more easily bounce between the two and so that 394 * we get an interrupt 1/2 way through the software 'fifo' we have 395 * to avoid overruns. 396 */ 397 if (atsc->flags & HAS_TIMEOUT) { 398 WR4(&sc->sc_bas, PDC_RPR, atsc->ping->pa); 399 WR4(&sc->sc_bas, PDC_RCR, sc->sc_rxfifosz); 400 WR4(&sc->sc_bas, PDC_RNPR, atsc->pong->pa); 401 WR4(&sc->sc_bas, PDC_RNCR, sc->sc_rxfifosz); 402 WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTEN); 403 404 /* Set the receive timeout to be 1.5 character times. */ 405 WR4(&sc->sc_bas, USART_RTOR, 12); 406 WR4(&sc->sc_bas, USART_CR, USART_CR_STTTO); 407 WR4(&sc->sc_bas, USART_IER, USART_CSR_TIMEOUT | 408 USART_CSR_RXBUFF | USART_CSR_ENDRX); 409 } else { 410 WR4(&sc->sc_bas, USART_IER, USART_CSR_RXRDY); 411 } 412 WR4(&sc->sc_bas, USART_IER, USART_CSR_RXBRK); 413 #ifndef SKYEYE_WORKAROUNDS 414 errout:; 415 // XXX bad 416 return (err); 417 #else 418 return (0); 419 #endif 420 } 421 422 static int 423 at91_usart_bus_transmit(struct uart_softc *sc) 424 { 425 #ifndef SKYEYE_WORKAROUNDS 426 bus_addr_t addr; 427 #endif 428 struct at91_usart_softc *atsc; 429 430 atsc = (struct at91_usart_softc *)sc; 431 #ifndef SKYEYE_WORKAROUNDS 432 if (bus_dmamap_load(atsc->dmatag, atsc->tx_map, sc->sc_txbuf, 433 sc->sc_txdatasz, at91_getaddr, &addr, 0) != 0) 434 return (EAGAIN); 435 bus_dmamap_sync(atsc->dmatag, atsc->tx_map, BUS_DMASYNC_PREWRITE); 436 #endif 437 438 uart_lock(sc->sc_hwmtx); 439 sc->sc_txbusy = 1; 440 #ifndef SKYEYE_WORKAROUNDS 441 /* 442 * Setup the PDC to transfer the data and interrupt us when it 443 * is done. We've already requested the interrupt. 444 */ 445 WR4(&sc->sc_bas, PDC_TPR, addr); 446 WR4(&sc->sc_bas, PDC_TCR, sc->sc_txdatasz); 447 WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_TXTEN); 448 WR4(&sc->sc_bas, USART_IER, USART_CSR_ENDTX); 449 uart_unlock(sc->sc_hwmtx); 450 #else 451 for (int i = 0; i < sc->sc_txdatasz; i++) 452 at91_usart_putc(&sc->sc_bas, sc->sc_txbuf[i]); 453 /* 454 * XXX: Gross hack : Skyeye doesn't raise an interrupt once the 455 * transfer is done, so simulate it. 456 */ 457 WR4(&sc->sc_bas, USART_IER, USART_CSR_TXRDY); 458 #endif 459 return (0); 460 } 461 static int 462 at91_usart_bus_setsig(struct uart_softc *sc, int sig) 463 { 464 uint32_t new, old, cr; 465 struct uart_bas *bas; 466 467 do { 468 old = sc->sc_hwsig; 469 new = old; 470 if (sig & SER_DDTR) 471 SIGCHG(sig & SER_DTR, new, SER_DTR, SER_DDTR); 472 if (sig & SER_DRTS) 473 SIGCHG(sig & SER_RTS, new, SER_RTS, SER_DRTS); 474 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 475 bas = &sc->sc_bas; 476 uart_lock(sc->sc_hwmtx); 477 cr = 0; 478 if (new & SER_DTR) 479 cr |= USART_CR_DTREN; 480 else 481 cr |= USART_CR_DTRDIS; 482 if (new & SER_RTS) 483 cr |= USART_CR_RTSEN; 484 else 485 cr |= USART_CR_RTSDIS; 486 WR4(bas, USART_CR, cr); 487 uart_unlock(sc->sc_hwmtx); 488 return (0); 489 } 490 static int 491 at91_usart_bus_receive(struct uart_softc *sc) 492 { 493 494 return (0); 495 } 496 static int 497 at91_usart_bus_param(struct uart_softc *sc, int baudrate, int databits, 498 int stopbits, int parity) 499 { 500 501 return (at91_usart_param(&sc->sc_bas, baudrate, databits, stopbits, 502 parity)); 503 } 504 505 static __inline void 506 at91_rx_put(struct uart_softc *sc, int key) 507 { 508 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 509 if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) { 510 if (kdb_alt_break(key, &sc->sc_altbrk)) 511 kdb_enter_why(KDB_WHY_BREAK, 512 "Break sequence to console"); 513 } 514 #endif 515 uart_rx_put(sc, key); 516 } 517 518 static int 519 at91_usart_bus_ipend(struct uart_softc *sc) 520 { 521 int csr = RD4(&sc->sc_bas, USART_CSR); 522 int ipend = 0, i, len; 523 struct at91_usart_softc *atsc; 524 struct at91_usart_rx *p; 525 526 atsc = (struct at91_usart_softc *)sc; 527 if (csr & USART_CSR_ENDTX) { 528 bus_dmamap_sync(atsc->dmatag, atsc->tx_map, 529 BUS_DMASYNC_POSTWRITE); 530 bus_dmamap_unload(atsc->dmatag, atsc->tx_map); 531 } 532 uart_lock(sc->sc_hwmtx); 533 if (csr & USART_CSR_TXRDY) { 534 if (sc->sc_txbusy) 535 ipend |= SER_INT_TXIDLE; 536 WR4(&sc->sc_bas, USART_IDR, USART_CSR_TXRDY); 537 } 538 if (csr & USART_CSR_ENDTX) { 539 if (sc->sc_txbusy) 540 ipend |= SER_INT_TXIDLE; 541 WR4(&sc->sc_bas, USART_IDR, USART_CSR_ENDTX); 542 } 543 544 /* 545 * Due to the contraints of the DMA engine present in the 546 * atmel chip, I can't just say I have a rx interrupt pending 547 * and do all the work elsewhere. I need to look at the CSR 548 * bits right now and do things based on them to avoid races. 549 */ 550 if ((atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_RXBUFF)) { 551 // Have a buffer overflow. Copy all data from both 552 // ping and pong. Insert overflow character. Reset 553 // ping and pong and re-enable the PDC to receive 554 // characters again. 555 bus_dmamap_sync(atsc->dmatag, atsc->ping->map, 556 BUS_DMASYNC_POSTREAD); 557 bus_dmamap_sync(atsc->dmatag, atsc->pong->map, 558 BUS_DMASYNC_POSTREAD); 559 for (i = 0; i < sc->sc_rxfifosz; i++) 560 at91_rx_put(sc, atsc->ping->buffer[i]); 561 for (i = 0; i < sc->sc_rxfifosz; i++) 562 at91_rx_put(sc, atsc->pong->buffer[i]); 563 uart_rx_put(sc, UART_STAT_OVERRUN); 564 csr &= ~(USART_CSR_ENDRX | USART_CSR_TIMEOUT); 565 WR4(&sc->sc_bas, PDC_RPR, atsc->ping->pa); 566 WR4(&sc->sc_bas, PDC_RCR, sc->sc_rxfifosz); 567 WR4(&sc->sc_bas, PDC_RNPR, atsc->pong->pa); 568 WR4(&sc->sc_bas, PDC_RNCR, sc->sc_rxfifosz); 569 WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTEN); 570 ipend |= SER_INT_RXREADY; 571 } 572 if ((atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_ENDRX)) { 573 // Shuffle data from 'ping' of ping pong buffer, but 574 // leave current 'pong' in place, as it has become the 575 // new 'ping'. We need to copy data and setup the old 576 // 'ping' as the new 'pong' when we're done. 577 bus_dmamap_sync(atsc->dmatag, atsc->ping->map, 578 BUS_DMASYNC_POSTREAD); 579 for (i = 0; i < sc->sc_rxfifosz; i++) 580 at91_rx_put(sc, atsc->ping->buffer[i]); 581 p = atsc->ping; 582 atsc->ping = atsc->pong; 583 atsc->pong = p; 584 WR4(&sc->sc_bas, PDC_RNPR, atsc->pong->pa); 585 WR4(&sc->sc_bas, PDC_RNCR, sc->sc_rxfifosz); 586 ipend |= SER_INT_RXREADY; 587 } 588 if ((atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_TIMEOUT)) { 589 // We have one partial buffer. We need to stop the 590 // PDC, get the number of characters left and from 591 // that compute number of valid characters. We then 592 // need to reset ping and pong and reenable the PDC. 593 // Not sure if there's a race here at fast baud rates 594 // we need to worry about. 595 WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTDIS); 596 bus_dmamap_sync(atsc->dmatag, atsc->ping->map, 597 BUS_DMASYNC_POSTREAD); 598 len = sc->sc_rxfifosz - RD4(&sc->sc_bas, PDC_RCR); 599 for (i = 0; i < len; i++) 600 at91_rx_put(sc, atsc->ping->buffer[i]); 601 WR4(&sc->sc_bas, PDC_RPR, atsc->ping->pa); 602 WR4(&sc->sc_bas, PDC_RCR, sc->sc_rxfifosz); 603 WR4(&sc->sc_bas, USART_CR, USART_CR_STTTO); 604 WR4(&sc->sc_bas, PDC_PTCR, PDC_PTCR_RXTEN); 605 ipend |= SER_INT_RXREADY; 606 } 607 if (!(atsc->flags & HAS_TIMEOUT) && (csr & USART_CSR_RXRDY)) { 608 // We have another charater in a device that doesn't support 609 // timeouts, so we do it one character at a time. 610 at91_rx_put(sc, RD4(&sc->sc_bas, USART_RHR) & 0xff); 611 ipend |= SER_INT_RXREADY; 612 } 613 614 if (csr & USART_CSR_RXBRK) { 615 unsigned int cr = USART_CR_RSTSTA; 616 617 ipend |= SER_INT_BREAK; 618 WR4(&sc->sc_bas, USART_CR, cr); 619 } 620 uart_unlock(sc->sc_hwmtx); 621 return (ipend); 622 } 623 static int 624 at91_usart_bus_flush(struct uart_softc *sc, int what) 625 { 626 return (0); 627 } 628 629 static int 630 at91_usart_bus_getsig(struct uart_softc *sc) 631 { 632 uint32_t new, sig; 633 uint8_t csr; 634 635 uart_lock(sc->sc_hwmtx); 636 csr = RD4(&sc->sc_bas, USART_CSR); 637 sig = 0; 638 if (csr & USART_CSR_CTS) 639 sig |= SER_CTS; 640 if (csr & USART_CSR_DCD) 641 sig |= SER_DCD; 642 if (csr & USART_CSR_DSR) 643 sig |= SER_DSR; 644 if (csr & USART_CSR_RI) 645 sig |= SER_RI; 646 new = sig & ~SER_MASK_DELTA; 647 sc->sc_hwsig = new; 648 uart_unlock(sc->sc_hwmtx); 649 return (sig); 650 } 651 652 static int 653 at91_usart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 654 { 655 switch (request) { 656 case UART_IOCTL_BREAK: 657 case UART_IOCTL_IFLOW: 658 case UART_IOCTL_OFLOW: 659 break; 660 case UART_IOCTL_BAUD: 661 WR4(&sc->sc_bas, USART_BRGR, BAUD2DIVISOR(*(int *)data)); 662 return (0); 663 } 664 return (EINVAL); 665 } 666 667 struct uart_class at91_usart_class = { 668 "at91_usart", 669 at91_usart_methods, 670 sizeof(struct at91_usart_softc), 671 .uc_ops = &at91_usart_ops, 672 .uc_range = 8, 673 .uc_rclk = DEFAULT_RCLK 674 };
Cache object: 0990c4a50a7597d16c71c4cae012c142
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