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