1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Olivier Houchard All rights reserved. 5 * Copyright (c) 2012 Thomas Skibo All rights reserved. 6 * Copyright (c) 2005 M. Warner Losh <imp@FreeBSD.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* A driver for the Cadence AMBA UART as used by the Xilinx Zynq-7000. 32 * 33 * Reference: Zynq-7000 All Programmable SoC Technical Reference Manual. 34 * (v1.4) November 16, 2012. Xilinx doc UG585. UART is covered in Ch. 19 35 * and register definitions are in appendix B.33. 36 */ 37 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/bus.h> 45 #include <sys/conf.h> 46 #include <sys/cons.h> 47 #include <machine/bus.h> 48 49 #include <dev/uart/uart.h> 50 #include <dev/uart/uart_cpu.h> 51 #include <dev/uart/uart_cpu_fdt.h> 52 #include <dev/uart/uart_bus.h> 53 54 #include "uart_if.h" 55 56 #define UART_FIFO_SIZE 64 57 58 #define RD4(bas, reg) \ 59 bus_space_read_4((bas)->bst, (bas)->bsh, uart_regofs((bas), (reg))) 60 #define WR4(bas, reg, value) \ 61 bus_space_write_4((bas)->bst, (bas)->bsh, uart_regofs((bas), (reg)), \ 62 (value)) 63 64 /* Register definitions for Cadence UART Controller. 65 */ 66 #define CDNC_UART_CTRL_REG 0x00 /* Control Register. */ 67 #define CDNC_UART_CTRL_REG_STOPBRK (1<<8) 68 #define CDNC_UART_CTRL_REG_STARTBRK (1<<7) 69 #define CDNC_UART_CTRL_REG_TORST (1<<6) 70 #define CDNC_UART_CTRL_REG_TX_DIS (1<<5) 71 #define CDNC_UART_CTRL_REG_TX_EN (1<<4) 72 #define CDNC_UART_CTRL_REG_RX_DIS (1<<3) 73 #define CDNC_UART_CTRL_REG_RX_EN (1<<2) 74 #define CDNC_UART_CTRL_REG_TXRST (1<<1) 75 #define CDNC_UART_CTRL_REG_RXRST (1<<0) 76 77 #define CDNC_UART_MODE_REG 0x04 /* Mode Register. */ 78 #define CDNC_UART_MODE_REG_CHMOD_R_LOOP (3<<8) /* [9:8] - channel mode */ 79 #define CDNC_UART_MODE_REG_CHMOD_L_LOOP (2<<8) 80 #define CDNC_UART_MODE_REG_CHMOD_AUTECHO (1<<8) 81 #define CDNC_UART_MODE_REG_STOP2 (2<<6) /* [7:6] - stop bits */ 82 #define CDNC_UART_MODE_REG_PAR_NONE (4<<3) /* [5:3] - parity type */ 83 #define CDNC_UART_MODE_REG_PAR_MARK (3<<3) 84 #define CDNC_UART_MODE_REG_PAR_SPACE (2<<3) 85 #define CDNC_UART_MODE_REG_PAR_ODD (1<<3) 86 #define CDNC_UART_MODE_REG_PAR_EVEN (0<<3) 87 #define CDNC_UART_MODE_REG_6BIT (3<<1) /* [2:1] - character len */ 88 #define CDNC_UART_MODE_REG_7BIT (2<<1) 89 #define CDNC_UART_MODE_REG_8BIT (0<<1) 90 #define CDNC_UART_MODE_REG_CLKSEL (1<<0) 91 92 #define CDNC_UART_IEN_REG 0x08 /* Interrupt registers. */ 93 #define CDNC_UART_IDIS_REG 0x0C 94 #define CDNC_UART_IMASK_REG 0x10 95 #define CDNC_UART_ISTAT_REG 0x14 96 #define CDNC_UART_INT_TXOVR (1<<12) 97 #define CDNC_UART_INT_TXNRLYFUL (1<<11) /* tx "nearly" full */ 98 #define CDNC_UART_INT_TXTRIG (1<<10) 99 #define CDNC_UART_INT_DMSI (1<<9) /* delta modem status */ 100 #define CDNC_UART_INT_RXTMOUT (1<<8) 101 #define CDNC_UART_INT_PARITY (1<<7) 102 #define CDNC_UART_INT_FRAMING (1<<6) 103 #define CDNC_UART_INT_RXOVR (1<<5) 104 #define CDNC_UART_INT_TXFULL (1<<4) 105 #define CDNC_UART_INT_TXEMPTY (1<<3) 106 #define CDNC_UART_INT_RXFULL (1<<2) 107 #define CDNC_UART_INT_RXEMPTY (1<<1) 108 #define CDNC_UART_INT_RXTRIG (1<<0) 109 #define CDNC_UART_INT_ALL 0x1FFF 110 111 #define CDNC_UART_BAUDGEN_REG 0x18 112 #define CDNC_UART_RX_TIMEO_REG 0x1C 113 #define CDNC_UART_RX_WATER_REG 0x20 114 115 #define CDNC_UART_MODEM_CTRL_REG 0x24 116 #define CDNC_UART_MODEM_CTRL_REG_FCM (1<<5) /* automatic flow control */ 117 #define CDNC_UART_MODEM_CTRL_REG_RTS (1<<1) 118 #define CDNC_UART_MODEM_CTRL_REG_DTR (1<<0) 119 120 #define CDNC_UART_MODEM_STAT_REG 0x28 121 #define CDNC_UART_MODEM_STAT_REG_FCMS (1<<8) /* flow control mode (rw) */ 122 #define CDNC_UART_MODEM_STAT_REG_DCD (1<<7) 123 #define CDNC_UART_MODEM_STAT_REG_RI (1<<6) 124 #define CDNC_UART_MODEM_STAT_REG_DSR (1<<5) 125 #define CDNC_UART_MODEM_STAT_REG_CTS (1<<4) 126 #define CDNC_UART_MODEM_STAT_REG_DDCD (1<<3) /* change in DCD (w1tc) */ 127 #define CDNC_UART_MODEM_STAT_REG_TERI (1<<2) /* trail edge ring (w1tc) */ 128 #define CDNC_UART_MODEM_STAT_REG_DDSR (1<<1) /* change in DSR (w1tc) */ 129 #define CDNC_UART_MODEM_STAT_REG_DCTS (1<<0) /* change in CTS (w1tc) */ 130 131 #define CDNC_UART_CHAN_STAT_REG 0x2C /* Channel status register. */ 132 #define CDNC_UART_CHAN_STAT_REG_TXNRLYFUL (1<<14) /* tx "nearly" full */ 133 #define CDNC_UART_CHAN_STAT_REG_TXTRIG (1<<13) 134 #define CDNC_UART_CHAN_STAT_REG_FDELT (1<<12) 135 #define CDNC_UART_CHAN_STAT_REG_TXACTIVE (1<<11) 136 #define CDNC_UART_CHAN_STAT_REG_RXACTIVE (1<<10) 137 #define CDNC_UART_CHAN_STAT_REG_TXFULL (1<<4) 138 #define CDNC_UART_CHAN_STAT_REG_TXEMPTY (1<<3) 139 #define CDNC_UART_CHAN_STAT_REG_RXEMPTY (1<<1) 140 #define CDNC_UART_CHAN_STAT_REG_RXTRIG (1<<0) 141 142 #define CDNC_UART_FIFO 0x30 /* Data FIFO (tx and rx) */ 143 #define CDNC_UART_BAUDDIV_REG 0x34 144 #define CDNC_UART_FLOWDEL_REG 0x38 145 #define CDNC_UART_TX_WATER_REG 0x44 146 147 148 /* 149 * Low-level UART interface. 150 */ 151 static int cdnc_uart_probe(struct uart_bas *bas); 152 static void cdnc_uart_init(struct uart_bas *bas, int, int, int, int); 153 static void cdnc_uart_term(struct uart_bas *bas); 154 static void cdnc_uart_putc(struct uart_bas *bas, int); 155 static int cdnc_uart_rxready(struct uart_bas *bas); 156 static int cdnc_uart_getc(struct uart_bas *bas, struct mtx *mtx); 157 158 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs; 159 160 static struct uart_ops cdnc_uart_ops = { 161 .probe = cdnc_uart_probe, 162 .init = cdnc_uart_init, 163 .term = cdnc_uart_term, 164 .putc = cdnc_uart_putc, 165 .rxready = cdnc_uart_rxready, 166 .getc = cdnc_uart_getc, 167 }; 168 169 #define SIGCHG(c, i, s, d) \ 170 if (c) { \ 171 i |= (i & s) ? s : s | d; \ 172 } else { \ 173 i = (i & s) ? (i & ~s) | d : i; \ 174 } 175 176 static int 177 cdnc_uart_probe(struct uart_bas *bas) 178 { 179 180 return (0); 181 } 182 183 static int 184 cdnc_uart_set_baud(struct uart_bas *bas, int baudrate) 185 { 186 uint32_t baudgen, bauddiv; 187 uint32_t best_bauddiv, best_baudgen, best_error; 188 uint32_t baud_out, err; 189 190 best_bauddiv = 0; 191 best_baudgen = 0; 192 best_error = ~0; 193 194 /* Try all possible bauddiv values and pick best match. */ 195 for (bauddiv = 4; bauddiv <= 255; bauddiv++) { 196 baudgen = (bas->rclk + (baudrate * (bauddiv + 1)) / 2) / 197 (baudrate * (bauddiv + 1)); 198 if (baudgen < 1 || baudgen > 0xffff) 199 continue; 200 201 baud_out = bas->rclk / (baudgen * (bauddiv + 1)); 202 err = baud_out > baudrate ? 203 baud_out - baudrate : baudrate - baud_out; 204 205 if (err < best_error) { 206 best_error = err; 207 best_bauddiv = bauddiv; 208 best_baudgen = baudgen; 209 } 210 } 211 212 if (best_bauddiv > 0) { 213 WR4(bas, CDNC_UART_BAUDDIV_REG, best_bauddiv); 214 WR4(bas, CDNC_UART_BAUDGEN_REG, best_baudgen); 215 return (0); 216 } else 217 return (-1); /* out of range */ 218 } 219 220 static int 221 cdnc_uart_set_params(struct uart_bas *bas, int baudrate, int databits, 222 int stopbits, int parity) 223 { 224 uint32_t mode_reg_value = 0; 225 226 switch (databits) { 227 case 6: 228 mode_reg_value |= CDNC_UART_MODE_REG_6BIT; 229 break; 230 case 7: 231 mode_reg_value |= CDNC_UART_MODE_REG_7BIT; 232 break; 233 case 8: 234 default: 235 mode_reg_value |= CDNC_UART_MODE_REG_8BIT; 236 break; 237 } 238 239 if (stopbits == 2) 240 mode_reg_value |= CDNC_UART_MODE_REG_STOP2; 241 242 switch (parity) { 243 case UART_PARITY_MARK: 244 mode_reg_value |= CDNC_UART_MODE_REG_PAR_MARK; 245 break; 246 case UART_PARITY_SPACE: 247 mode_reg_value |= CDNC_UART_MODE_REG_PAR_SPACE; 248 break; 249 case UART_PARITY_ODD: 250 mode_reg_value |= CDNC_UART_MODE_REG_PAR_ODD; 251 break; 252 case UART_PARITY_EVEN: 253 mode_reg_value |= CDNC_UART_MODE_REG_PAR_EVEN; 254 break; 255 case UART_PARITY_NONE: 256 default: 257 mode_reg_value |= CDNC_UART_MODE_REG_PAR_NONE; 258 break; 259 } 260 261 WR4(bas, CDNC_UART_MODE_REG, mode_reg_value); 262 263 if (baudrate > 0 && cdnc_uart_set_baud(bas, baudrate) < 0) 264 return (EINVAL); 265 266 return(0); 267 } 268 269 static void 270 cdnc_uart_hw_init(struct uart_bas *bas) 271 { 272 273 /* Reset RX and TX. */ 274 WR4(bas, CDNC_UART_CTRL_REG, 275 CDNC_UART_CTRL_REG_RXRST | CDNC_UART_CTRL_REG_TXRST); 276 277 /* Interrupts all off. */ 278 WR4(bas, CDNC_UART_IDIS_REG, CDNC_UART_INT_ALL); 279 WR4(bas, CDNC_UART_ISTAT_REG, CDNC_UART_INT_ALL); 280 281 /* Clear delta bits. */ 282 WR4(bas, CDNC_UART_MODEM_STAT_REG, 283 CDNC_UART_MODEM_STAT_REG_DDCD | CDNC_UART_MODEM_STAT_REG_TERI | 284 CDNC_UART_MODEM_STAT_REG_DDSR | CDNC_UART_MODEM_STAT_REG_DCTS); 285 286 /* RX FIFO water level, stale timeout */ 287 WR4(bas, CDNC_UART_RX_WATER_REG, UART_FIFO_SIZE/2); 288 WR4(bas, CDNC_UART_RX_TIMEO_REG, 10); 289 290 /* TX FIFO water level (not used.) */ 291 WR4(bas, CDNC_UART_TX_WATER_REG, UART_FIFO_SIZE/2); 292 293 /* Bring RX and TX online. */ 294 WR4(bas, CDNC_UART_CTRL_REG, 295 CDNC_UART_CTRL_REG_RX_EN | CDNC_UART_CTRL_REG_TX_EN | 296 CDNC_UART_CTRL_REG_TORST | CDNC_UART_CTRL_REG_STOPBRK); 297 298 /* Set DTR and RTS. */ 299 WR4(bas, CDNC_UART_MODEM_CTRL_REG, CDNC_UART_MODEM_CTRL_REG_DTR | 300 CDNC_UART_MODEM_CTRL_REG_RTS); 301 } 302 303 /* 304 * Initialize this device for use as a console. 305 */ 306 static void 307 cdnc_uart_init(struct uart_bas *bas, int baudrate, int databits, int stopbits, 308 int parity) 309 { 310 311 /* Initialize hardware. */ 312 cdnc_uart_hw_init(bas); 313 314 /* Set baudrate, parameters. */ 315 (void)cdnc_uart_set_params(bas, baudrate, databits, stopbits, parity); 316 } 317 318 /* 319 * Free resources now that we're no longer the console. This appears to 320 * be never called, and I'm unsure quite what to do if I am called. 321 */ 322 static void 323 cdnc_uart_term(struct uart_bas *bas) 324 { 325 326 /* XXX */ 327 } 328 329 /* 330 * Put a character of console output (so we do it here polling rather than 331 * interrutp driven). 332 */ 333 static void 334 cdnc_uart_putc(struct uart_bas *bas, int c) 335 { 336 337 /* Wait for room. */ 338 while ((RD4(bas,CDNC_UART_CHAN_STAT_REG) & 339 CDNC_UART_CHAN_STAT_REG_TXFULL) != 0) 340 ; 341 342 WR4(bas, CDNC_UART_FIFO, c); 343 344 while ((RD4(bas,CDNC_UART_CHAN_STAT_REG) & 345 CDNC_UART_CHAN_STAT_REG_TXEMPTY) == 0) 346 ; 347 } 348 349 /* 350 * Check for a character available. 351 */ 352 static int 353 cdnc_uart_rxready(struct uart_bas *bas) 354 { 355 356 return ((RD4(bas, CDNC_UART_CHAN_STAT_REG) & 357 CDNC_UART_CHAN_STAT_REG_RXEMPTY) == 0); 358 } 359 360 /* 361 * Block waiting for a character. 362 */ 363 static int 364 cdnc_uart_getc(struct uart_bas *bas, struct mtx *mtx) 365 { 366 int c; 367 368 uart_lock(mtx); 369 370 while ((RD4(bas, CDNC_UART_CHAN_STAT_REG) & 371 CDNC_UART_CHAN_STAT_REG_RXEMPTY) != 0) { 372 uart_unlock(mtx); 373 DELAY(4); 374 uart_lock(mtx); 375 } 376 377 c = RD4(bas, CDNC_UART_FIFO); 378 379 uart_unlock(mtx); 380 381 c &= 0xff; 382 return (c); 383 } 384 385 /*****************************************************************************/ 386 /* 387 * High-level UART interface. 388 */ 389 390 static int cdnc_uart_bus_probe(struct uart_softc *sc); 391 static int cdnc_uart_bus_attach(struct uart_softc *sc); 392 static int cdnc_uart_bus_flush(struct uart_softc *, int); 393 static int cdnc_uart_bus_getsig(struct uart_softc *); 394 static int cdnc_uart_bus_ioctl(struct uart_softc *, int, intptr_t); 395 static int cdnc_uart_bus_ipend(struct uart_softc *); 396 static int cdnc_uart_bus_param(struct uart_softc *, int, int, int, int); 397 static int cdnc_uart_bus_receive(struct uart_softc *); 398 static int cdnc_uart_bus_setsig(struct uart_softc *, int); 399 static int cdnc_uart_bus_transmit(struct uart_softc *); 400 static void cdnc_uart_bus_grab(struct uart_softc *); 401 static void cdnc_uart_bus_ungrab(struct uart_softc *); 402 403 static kobj_method_t cdnc_uart_bus_methods[] = { 404 KOBJMETHOD(uart_probe, cdnc_uart_bus_probe), 405 KOBJMETHOD(uart_attach, cdnc_uart_bus_attach), 406 KOBJMETHOD(uart_flush, cdnc_uart_bus_flush), 407 KOBJMETHOD(uart_getsig, cdnc_uart_bus_getsig), 408 KOBJMETHOD(uart_ioctl, cdnc_uart_bus_ioctl), 409 KOBJMETHOD(uart_ipend, cdnc_uart_bus_ipend), 410 KOBJMETHOD(uart_param, cdnc_uart_bus_param), 411 KOBJMETHOD(uart_receive, cdnc_uart_bus_receive), 412 KOBJMETHOD(uart_setsig, cdnc_uart_bus_setsig), 413 KOBJMETHOD(uart_transmit, cdnc_uart_bus_transmit), 414 KOBJMETHOD(uart_grab, cdnc_uart_bus_grab), 415 KOBJMETHOD(uart_ungrab, cdnc_uart_bus_ungrab), 416 417 KOBJMETHOD_END 418 }; 419 420 int 421 cdnc_uart_bus_probe(struct uart_softc *sc) 422 { 423 424 sc->sc_txfifosz = UART_FIFO_SIZE; 425 sc->sc_rxfifosz = UART_FIFO_SIZE; 426 sc->sc_hwiflow = 0; 427 sc->sc_hwoflow = 0; 428 429 device_set_desc(sc->sc_dev, "Cadence UART"); 430 431 return (0); 432 } 433 434 static int 435 cdnc_uart_bus_attach(struct uart_softc *sc) 436 { 437 struct uart_bas *bas = &sc->sc_bas; 438 struct uart_devinfo *di; 439 440 if (sc->sc_sysdev != NULL) { 441 di = sc->sc_sysdev; 442 (void)cdnc_uart_set_params(bas, di->baudrate, di->databits, 443 di->stopbits, di->parity); 444 } else 445 cdnc_uart_hw_init(bas); 446 447 (void)cdnc_uart_bus_getsig(sc); 448 449 /* Enable interrupts. */ 450 WR4(bas, CDNC_UART_IEN_REG, 451 CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT | 452 CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | 453 CDNC_UART_INT_DMSI); 454 455 return (0); 456 } 457 458 static int 459 cdnc_uart_bus_transmit(struct uart_softc *sc) 460 { 461 int i; 462 struct uart_bas *bas = &sc->sc_bas; 463 464 uart_lock(sc->sc_hwmtx); 465 466 /* Clear sticky TXEMPTY status bit. */ 467 WR4(bas, CDNC_UART_ISTAT_REG, CDNC_UART_INT_TXEMPTY); 468 469 for (i = 0; i < sc->sc_txdatasz; i++) 470 WR4(bas, CDNC_UART_FIFO, sc->sc_txbuf[i]); 471 472 /* Enable TX empty interrupt. */ 473 WR4(bas, CDNC_UART_IEN_REG, CDNC_UART_INT_TXEMPTY); 474 sc->sc_txbusy = 1; 475 476 uart_unlock(sc->sc_hwmtx); 477 478 return (0); 479 } 480 481 static int 482 cdnc_uart_bus_setsig(struct uart_softc *sc, int sig) 483 { 484 struct uart_bas *bas = &sc->sc_bas; 485 uint32_t new, old, modem_ctrl; 486 487 do { 488 old = sc->sc_hwsig; 489 new = old; 490 if (sig & SER_DDTR) { 491 SIGCHG(sig & SER_DTR, new, SER_DTR, SER_DDTR); 492 } 493 if (sig & SER_DRTS) { 494 SIGCHG(sig & SER_RTS, new, SER_RTS, SER_DRTS); 495 } 496 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 497 uart_lock(sc->sc_hwmtx); 498 modem_ctrl = RD4(bas, CDNC_UART_MODEM_CTRL_REG) & 499 ~(CDNC_UART_MODEM_CTRL_REG_DTR | CDNC_UART_MODEM_CTRL_REG_RTS); 500 if ((new & SER_DTR) != 0) 501 modem_ctrl |= CDNC_UART_MODEM_CTRL_REG_DTR; 502 if ((new & SER_RTS) != 0) 503 modem_ctrl |= CDNC_UART_MODEM_CTRL_REG_RTS; 504 WR4(bas, CDNC_UART_MODEM_CTRL_REG, modem_ctrl); 505 506 uart_unlock(sc->sc_hwmtx); 507 return (0); 508 } 509 510 static int 511 cdnc_uart_bus_receive(struct uart_softc *sc) 512 { 513 struct uart_bas *bas = &sc->sc_bas; 514 uint32_t status; 515 int c, c_status = 0; 516 517 uart_lock(sc->sc_hwmtx); 518 519 /* Check for parity or framing errors and clear the status bits. */ 520 status = RD4(bas, CDNC_UART_ISTAT_REG); 521 if ((status & (CDNC_UART_INT_FRAMING | CDNC_UART_INT_PARITY)) != 0) { 522 WR4(bas, CDNC_UART_ISTAT_REG, 523 status & (CDNC_UART_INT_FRAMING | CDNC_UART_INT_PARITY)); 524 if ((status & CDNC_UART_INT_PARITY) != 0) 525 c_status |= UART_STAT_PARERR; 526 if ((status & CDNC_UART_INT_FRAMING) != 0) 527 c_status |= UART_STAT_FRAMERR; 528 } 529 530 while ((RD4(bas, CDNC_UART_CHAN_STAT_REG) & 531 CDNC_UART_CHAN_STAT_REG_RXEMPTY) == 0) { 532 c = RD4(bas, CDNC_UART_FIFO) & 0xff; 533 #ifdef KDB 534 /* Detect break and drop into debugger. */ 535 if (c == 0 && (c_status & UART_STAT_FRAMERR) != 0 && 536 sc->sc_sysdev != NULL && 537 sc->sc_sysdev->type == UART_DEV_CONSOLE) { 538 kdb_break(); 539 WR4(bas, CDNC_UART_ISTAT_REG, CDNC_UART_INT_FRAMING); 540 } 541 #endif 542 uart_rx_put(sc, c | c_status); 543 } 544 545 uart_unlock(sc->sc_hwmtx); 546 547 return (0); 548 } 549 550 static int 551 cdnc_uart_bus_param(struct uart_softc *sc, int baudrate, int databits, 552 int stopbits, int parity) 553 { 554 555 return (cdnc_uart_set_params(&sc->sc_bas, baudrate, 556 databits, stopbits, parity)); 557 } 558 559 static int 560 cdnc_uart_bus_ipend(struct uart_softc *sc) 561 { 562 int ipend = 0; 563 struct uart_bas *bas = &sc->sc_bas; 564 uint32_t istatus; 565 566 uart_lock(sc->sc_hwmtx); 567 568 istatus = RD4(bas, CDNC_UART_ISTAT_REG); 569 570 /* Clear interrupt bits. */ 571 WR4(bas, CDNC_UART_ISTAT_REG, istatus & 572 (CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT | 573 CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | 574 CDNC_UART_INT_TXEMPTY | CDNC_UART_INT_DMSI)); 575 576 /* Receive data. */ 577 if ((istatus & (CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT)) != 0) 578 ipend |= SER_INT_RXREADY; 579 580 /* Transmit fifo empty. */ 581 if (sc->sc_txbusy && (istatus & CDNC_UART_INT_TXEMPTY) != 0) { 582 /* disable txempty interrupt. */ 583 WR4(bas, CDNC_UART_IDIS_REG, CDNC_UART_INT_TXEMPTY); 584 ipend |= SER_INT_TXIDLE; 585 } 586 587 /* TX Overflow. */ 588 if ((istatus & CDNC_UART_INT_TXOVR) != 0) 589 ipend |= SER_INT_OVERRUN; 590 591 /* RX Overflow. */ 592 if ((istatus & CDNC_UART_INT_RXOVR) != 0) 593 ipend |= SER_INT_OVERRUN; 594 595 /* Modem signal change. */ 596 if ((istatus & CDNC_UART_INT_DMSI) != 0) { 597 WR4(bas, CDNC_UART_MODEM_STAT_REG, 598 CDNC_UART_MODEM_STAT_REG_DDCD | 599 CDNC_UART_MODEM_STAT_REG_TERI | 600 CDNC_UART_MODEM_STAT_REG_DDSR | 601 CDNC_UART_MODEM_STAT_REG_DCTS); 602 ipend |= SER_INT_SIGCHG; 603 } 604 605 uart_unlock(sc->sc_hwmtx); 606 return (ipend); 607 } 608 609 static int 610 cdnc_uart_bus_flush(struct uart_softc *sc, int what) 611 { 612 613 return (0); 614 } 615 616 static int 617 cdnc_uart_bus_getsig(struct uart_softc *sc) 618 { 619 struct uart_bas *bas = &sc->sc_bas; 620 uint32_t new, old, sig; 621 uint8_t modem_status; 622 623 do { 624 old = sc->sc_hwsig; 625 sig = old; 626 uart_lock(sc->sc_hwmtx); 627 modem_status = RD4(bas, CDNC_UART_MODEM_STAT_REG); 628 uart_unlock(sc->sc_hwmtx); 629 SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_DSR, 630 sig, SER_DSR, SER_DDSR); 631 SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_CTS, 632 sig, SER_CTS, SER_DCTS); 633 SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_DCD, 634 sig, SER_DCD, SER_DDCD); 635 SIGCHG(modem_status & CDNC_UART_MODEM_STAT_REG_RI, 636 sig, SER_RI, SER_DRI); 637 new = sig & ~SER_MASK_DELTA; 638 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 639 return (sig); 640 } 641 642 static int 643 cdnc_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 644 { 645 struct uart_bas *bas = &sc->sc_bas; 646 uint32_t uart_ctrl, modem_ctrl; 647 int error = 0; 648 649 uart_lock(sc->sc_hwmtx); 650 651 switch (request) { 652 case UART_IOCTL_BREAK: 653 uart_ctrl = RD4(bas, CDNC_UART_CTRL_REG); 654 if (data) { 655 uart_ctrl |= CDNC_UART_CTRL_REG_STARTBRK; 656 uart_ctrl &= ~CDNC_UART_CTRL_REG_STOPBRK; 657 } else { 658 uart_ctrl |= CDNC_UART_CTRL_REG_STOPBRK; 659 uart_ctrl &= ~CDNC_UART_CTRL_REG_STARTBRK; 660 } 661 WR4(bas, CDNC_UART_CTRL_REG, uart_ctrl); 662 break; 663 case UART_IOCTL_IFLOW: 664 modem_ctrl = RD4(bas, CDNC_UART_MODEM_CTRL_REG); 665 if (data) 666 modem_ctrl |= CDNC_UART_MODEM_CTRL_REG_RTS; 667 else 668 modem_ctrl &= ~CDNC_UART_MODEM_CTRL_REG_RTS; 669 WR4(bas, CDNC_UART_MODEM_CTRL_REG, modem_ctrl); 670 break; 671 default: 672 error = EINVAL; 673 break; 674 } 675 676 uart_unlock(sc->sc_hwmtx); 677 678 return (error); 679 } 680 681 static void 682 cdnc_uart_bus_grab(struct uart_softc *sc) 683 { 684 685 /* Enable interrupts. */ 686 WR4(&sc->sc_bas, CDNC_UART_IEN_REG, 687 CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | 688 CDNC_UART_INT_DMSI); 689 } 690 691 static void 692 cdnc_uart_bus_ungrab(struct uart_softc *sc) 693 { 694 695 /* Enable interrupts. */ 696 WR4(&sc->sc_bas, CDNC_UART_IEN_REG, 697 CDNC_UART_INT_RXTRIG | CDNC_UART_INT_RXTMOUT | 698 CDNC_UART_INT_TXOVR | CDNC_UART_INT_RXOVR | 699 CDNC_UART_INT_DMSI); 700 } 701 702 static struct uart_class uart_cdnc_class = { 703 "cdnc_uart", 704 cdnc_uart_bus_methods, 705 sizeof(struct uart_softc), 706 .uc_ops = &cdnc_uart_ops, 707 .uc_range = 8 708 }; 709 710 static struct ofw_compat_data compat_data[] = { 711 {"cadence,uart", (uintptr_t)&uart_cdnc_class}, 712 {"cdns,uart-r1p12", (uintptr_t)&uart_cdnc_class}, 713 {"xlnx,xuartps", (uintptr_t)&uart_cdnc_class}, 714 {NULL, (uintptr_t)NULL}, 715 }; 716 UART_FDT_CLASS_AND_DEVICE(compat_data); 717