vf_uart.c revision 258057
1/*- 2 * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * Vybrid Family Universal Asynchronous Receiver/Transmitter 29 * Chapter 49, Vybrid Reference Manual, Rev. 5, 07/2013 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/arm/freescale/vybrid/vf_uart.c 258057 2013-11-12 18:02:56Z br $"); 34 35#include "opt_ddb.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/bus.h> 40#include <sys/conf.h> 41#include <sys/kdb.h> 42#include <machine/bus.h> 43#include <machine/fdt.h> 44 45#include <dev/uart/uart.h> 46#include <dev/uart/uart_cpu.h> 47#include <dev/uart/uart_bus.h> 48 49#include "uart_if.h" 50 51#define UART_BDH 0x00 /* Baud Rate Registers: High */ 52#define UART_BDL 0x01 /* Baud Rate Registers: Low */ 53#define UART_C1 0x02 /* Control Register 1 */ 54#define UART_C2 0x03 /* Control Register 2 */ 55#define UART_S1 0x04 /* Status Register 1 */ 56#define UART_S2 0x05 /* Status Register 2 */ 57#define UART_C3 0x06 /* Control Register 3 */ 58#define UART_D 0x07 /* Data Register */ 59#define UART_MA1 0x08 /* Match Address Registers 1 */ 60#define UART_MA2 0x09 /* Match Address Registers 2 */ 61#define UART_C4 0x0A /* Control Register 4 */ 62#define UART_C5 0x0B /* Control Register 5 */ 63#define UART_ED 0x0C /* Extended Data Register */ 64#define UART_MODEM 0x0D /* Modem Register */ 65#define UART_IR 0x0E /* Infrared Register */ 66#define UART_PFIFO 0x10 /* FIFO Parameters */ 67#define UART_CFIFO 0x11 /* FIFO Control Register */ 68#define UART_SFIFO 0x12 /* FIFO Status Register */ 69#define UART_TWFIFO 0x13 /* FIFO Transmit Watermark */ 70#define UART_TCFIFO 0x14 /* FIFO Transmit Count */ 71#define UART_RWFIFO 0x15 /* FIFO Receive Watermark */ 72#define UART_RCFIFO 0x16 /* FIFO Receive Count */ 73#define UART_C7816 0x18 /* 7816 Control Register */ 74#define UART_IE7816 0x19 /* 7816 Interrupt Enable Register */ 75#define UART_IS7816 0x1A /* 7816 Interrupt Status Register */ 76#define UART_WP7816T0 0x1B /* 7816 Wait Parameter Register */ 77#define UART_WP7816T1 0x1B /* 7816 Wait Parameter Register */ 78#define UART_WN7816 0x1C /* 7816 Wait N Register */ 79#define UART_WF7816 0x1D /* 7816 Wait FD Register */ 80#define UART_ET7816 0x1E /* 7816 Error Threshold Register */ 81#define UART_TL7816 0x1F /* 7816 Transmit Length Register */ 82#define UART_C6 0x21 /* CEA709.1-B Control Register 6 */ 83#define UART_PCTH 0x22 /* CEA709.1-B Packet Cycle Time Counter High */ 84#define UART_PCTL 0x23 /* CEA709.1-B Packet Cycle Time Counter Low */ 85#define UART_B1T 0x24 /* CEA709.1-B Beta1 Timer */ 86#define UART_SDTH 0x25 /* CEA709.1-B Secondary Delay Timer High */ 87#define UART_SDTL 0x26 /* CEA709.1-B Secondary Delay Timer Low */ 88#define UART_PRE 0x27 /* CEA709.1-B Preamble */ 89#define UART_TPL 0x28 /* CEA709.1-B Transmit Packet Length */ 90#define UART_IE 0x29 /* CEA709.1-B Interrupt Enable Register */ 91#define UART_WB 0x2A /* CEA709.1-B WBASE */ 92#define UART_S3 0x2B /* CEA709.1-B Status Register */ 93#define UART_S4 0x2C /* CEA709.1-B Status Register */ 94#define UART_RPL 0x2D /* CEA709.1-B Received Packet Length */ 95#define UART_RPREL 0x2E /* CEA709.1-B Received Preamble Length */ 96#define UART_CPW 0x2F /* CEA709.1-B Collision Pulse Width */ 97#define UART_RIDT 0x30 /* CEA709.1-B Receive Indeterminate Time */ 98#define UART_TIDT 0x31 /* CEA709.1-B Transmit Indeterminate Time */ 99 100#define UART_C2_TE (1 << 3) /* Transmitter Enable */ 101#define UART_C2_TIE (1 << 7) /* Transmitter Interrupt Enable */ 102#define UART_C2_RE (1 << 2) /* Receiver Enable */ 103#define UART_C2_RIE (1 << 5) /* Receiver Interrupt Enable */ 104#define UART_S1_TDRE (1 << 7) /* Transmit Data Register Empty Flag */ 105#define UART_S1_RDRF (1 << 5) /* Receive Data Register Full Flag */ 106#define UART_S2_LBKDIF (1 << 7) /* LIN Break Detect Interrupt Flag */ 107 108#define UART_C4_BRFA 0x1f /* Baud Rate Fine Adjust */ 109#define UART_BDH_SBR 0x1f /* UART Baud Rate Bits */ 110 111/* 112 * Low-level UART interface. 113 */ 114static int vf_uart_probe(struct uart_bas *bas); 115static void vf_uart_init(struct uart_bas *bas, int, int, int, int); 116static void vf_uart_term(struct uart_bas *bas); 117static void vf_uart_putc(struct uart_bas *bas, int); 118static int vf_uart_rxready(struct uart_bas *bas); 119static int vf_uart_getc(struct uart_bas *bas, struct mtx *); 120 121void uart_reinit(struct uart_softc *,int,int); 122 123static struct uart_ops uart_vybrid_ops = { 124 .probe = vf_uart_probe, 125 .init = vf_uart_init, 126 .term = vf_uart_term, 127 .putc = vf_uart_putc, 128 .rxready = vf_uart_rxready, 129 .getc = vf_uart_getc, 130}; 131 132static int 133vf_uart_probe(struct uart_bas *bas) 134{ 135 136 return (0); 137} 138 139static void 140vf_uart_init(struct uart_bas *bas, int baudrate, int databits, 141 int stopbits, int parity) 142{ 143 144} 145 146static void 147vf_uart_term(struct uart_bas *bas) 148{ 149 150} 151 152static void 153vf_uart_putc(struct uart_bas *bas, int c) 154{ 155 156 while (!(uart_getreg(bas, UART_S1) & UART_S1_TDRE)) 157 ; 158 159 uart_setreg(bas, UART_D, c); 160} 161 162static int 163vf_uart_rxready(struct uart_bas *bas) 164{ 165 int usr1; 166 167 usr1 = uart_getreg(bas, UART_S1); 168 if (usr1 & UART_S1_RDRF) { 169 return (1); 170 } 171 172 return (0); 173} 174 175static int 176vf_uart_getc(struct uart_bas *bas, struct mtx *hwmtx) 177{ 178 int c; 179 180 uart_lock(hwmtx); 181 182 while (!(uart_getreg(bas, UART_S1) & UART_S1_RDRF)) 183 ; 184 185 c = uart_getreg(bas, UART_D); 186 uart_unlock(hwmtx); 187 188 return (c & 0xff); 189} 190 191/* 192 * High-level UART interface. 193 */ 194struct vf_uart_softc { 195 struct uart_softc base; 196}; 197 198void 199uart_reinit(struct uart_softc *sc, int clkspeed, int baud) 200{ 201 struct uart_bas *bas; 202 int sbr; 203 int brfa; 204 int reg; 205 206 bas = &sc->sc_bas; 207 if (!bas) { 208 printf("Error: cant reconfigure bas\n"); 209 return; 210 } 211 212 uart_setreg(bas, UART_MODEM, 0x00); 213 214 /* 215 * Disable transmitter and receiver 216 * for a while. 217 */ 218 reg = uart_getreg(bas, UART_C2); 219 reg &= ~(UART_C2_RE | UART_C2_TE); 220 uart_setreg(bas, UART_C2, 0x00); 221 222 uart_setreg(bas, UART_C1, 0x00); 223 224 sbr = (uint16_t) (clkspeed / (baud * 16)); 225 brfa = (clkspeed / baud) - (sbr * 16); 226 227 reg = uart_getreg(bas, UART_BDH); 228 reg &= ~UART_BDH_SBR; 229 reg |= ((sbr & 0x1f00) >> 8); 230 uart_setreg(bas, UART_BDH, reg); 231 232 reg = sbr & 0x00ff; 233 uart_setreg(bas, UART_BDL, reg); 234 235 reg = uart_getreg(bas, UART_C4); 236 reg &= ~UART_C4_BRFA; 237 reg |= (brfa & UART_C4_BRFA); 238 uart_setreg(bas, UART_C4, reg); 239 240 reg = uart_getreg(bas, UART_C2); 241 reg |= (UART_C2_RE | UART_C2_TE); 242 uart_setreg(bas, UART_C2, reg); 243 244} 245 246static int vf_uart_bus_attach(struct uart_softc *); 247static int vf_uart_bus_detach(struct uart_softc *); 248static int vf_uart_bus_flush(struct uart_softc *, int); 249static int vf_uart_bus_getsig(struct uart_softc *); 250static int vf_uart_bus_ioctl(struct uart_softc *, int, intptr_t); 251static int vf_uart_bus_ipend(struct uart_softc *); 252static int vf_uart_bus_param(struct uart_softc *, int, int, int, int); 253static int vf_uart_bus_probe(struct uart_softc *); 254static int vf_uart_bus_receive(struct uart_softc *); 255static int vf_uart_bus_setsig(struct uart_softc *, int); 256static int vf_uart_bus_transmit(struct uart_softc *); 257 258static kobj_method_t vf_uart_methods[] = { 259 KOBJMETHOD(uart_attach, vf_uart_bus_attach), 260 KOBJMETHOD(uart_detach, vf_uart_bus_detach), 261 KOBJMETHOD(uart_flush, vf_uart_bus_flush), 262 KOBJMETHOD(uart_getsig, vf_uart_bus_getsig), 263 KOBJMETHOD(uart_ioctl, vf_uart_bus_ioctl), 264 KOBJMETHOD(uart_ipend, vf_uart_bus_ipend), 265 KOBJMETHOD(uart_param, vf_uart_bus_param), 266 KOBJMETHOD(uart_probe, vf_uart_bus_probe), 267 KOBJMETHOD(uart_receive, vf_uart_bus_receive), 268 KOBJMETHOD(uart_setsig, vf_uart_bus_setsig), 269 KOBJMETHOD(uart_transmit, vf_uart_bus_transmit), 270 { 0, 0 } 271}; 272 273struct uart_class uart_vybrid_class = { 274 "vybrid", 275 vf_uart_methods, 276 sizeof(struct vf_uart_softc), 277 .uc_ops = &uart_vybrid_ops, 278 .uc_range = 0x100, 279 .uc_rclk = 24000000 /* TODO: get value from CCM */ 280}; 281 282static int 283vf_uart_bus_attach(struct uart_softc *sc) 284{ 285 struct uart_bas *bas; 286 int reg; 287 288 bas = &sc->sc_bas; 289 290 sc->sc_hwiflow = 0; 291 sc->sc_hwoflow = 0; 292 293 uart_reinit(sc, 66000000, 115200); 294 295 reg = uart_getreg(bas, UART_C2); 296 if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) { 297 reg &= ~UART_C2_RIE; 298 } else { 299 reg |= UART_C2_RIE; 300 } 301 uart_setreg(bas, UART_C2, reg); 302 303 return (0); 304} 305 306static int 307vf_uart_bus_detach(struct uart_softc *sc) 308{ 309 310 /* TODO */ 311 return (0); 312} 313 314static int 315vf_uart_bus_flush(struct uart_softc *sc, int what) 316{ 317 318 /* TODO */ 319 return (0); 320} 321 322static int 323vf_uart_bus_getsig(struct uart_softc *sc) 324{ 325 326 /* TODO */ 327 return (0); 328} 329 330static int 331vf_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 332{ 333 struct uart_bas *bas; 334 int error; 335 336 bas = &sc->sc_bas; 337 error = 0; 338 uart_lock(sc->sc_hwmtx); 339 switch (request) { 340 case UART_IOCTL_BREAK: 341 /* TODO */ 342 break; 343 case UART_IOCTL_BAUD: 344 /* TODO */ 345 *(int*)data = 115200; 346 break; 347 default: 348 error = EINVAL; 349 break; 350 } 351 uart_unlock(sc->sc_hwmtx); 352 353 return (error); 354} 355 356static int 357vf_uart_bus_ipend(struct uart_softc *sc) 358{ 359 struct uart_bas *bas; 360 int ipend; 361 uint32_t usr1, usr2; 362 int reg; 363 int sfifo; 364 365 bas = &sc->sc_bas; 366 ipend = 0; 367 368 uart_lock(sc->sc_hwmtx); 369 370 usr1 = uart_getreg(bas, UART_S1); 371 usr2 = uart_getreg(bas, UART_S2); 372 sfifo = uart_getreg(bas, UART_SFIFO); 373 374 /* ack usr2 */ 375 uart_setreg(bas, UART_S2, usr2); 376 377 if (usr1 & UART_S1_TDRE) { 378 reg = uart_getreg(bas, UART_C2); 379 reg &= ~(UART_C2_TIE); 380 uart_setreg(bas, UART_C2, reg); 381 382 if (sc->sc_txbusy != 0) { 383 ipend |= SER_INT_TXIDLE; 384 } 385 } 386 387 if (usr1 & UART_S1_RDRF) { 388 reg = uart_getreg(bas, UART_C2); 389 reg &= ~(UART_C2_RIE); 390 uart_setreg(bas, UART_C2, reg); 391 392 ipend |= SER_INT_RXREADY; 393 } 394 395 if (usr2 & UART_S2_LBKDIF) { 396 ipend |= SER_INT_BREAK; 397 } 398 399 uart_unlock(sc->sc_hwmtx); 400 401 return (ipend); 402} 403 404static int 405vf_uart_bus_param(struct uart_softc *sc, int baudrate, int databits, 406 int stopbits, int parity) 407{ 408 409 uart_lock(sc->sc_hwmtx); 410 vf_uart_init(&sc->sc_bas, baudrate, databits, stopbits, parity); 411 uart_unlock(sc->sc_hwmtx); 412 413 return (0); 414} 415 416static int 417vf_uart_bus_probe(struct uart_softc *sc) 418{ 419 int error; 420 421 error = vf_uart_probe(&sc->sc_bas); 422 if (error) 423 return (error); 424 425 sc->sc_rxfifosz = 1; 426 sc->sc_txfifosz = 1; 427 428 device_set_desc(sc->sc_dev, "Vybrid Family UART"); 429 return (0); 430} 431 432static int 433vf_uart_bus_receive(struct uart_softc *sc) 434{ 435 struct uart_bas *bas; 436 int reg; 437 int c; 438 439 bas = &sc->sc_bas; 440 uart_lock(sc->sc_hwmtx); 441 442 /* Read FIFO */ 443 while (uart_getreg(bas, UART_S1) & UART_S1_RDRF) { 444 if (uart_rx_full(sc)) { 445 /* No space left in input buffer */ 446 sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; 447 break; 448 } 449 450 c = uart_getreg(bas, UART_D); 451 uart_rx_put(sc, c); 452 } 453 454 /* Reenable Data Ready interrupt */ 455 reg = uart_getreg(bas, UART_C2); 456 reg |= (UART_C2_RIE); 457 uart_setreg(bas, UART_C2, reg); 458 459 uart_unlock(sc->sc_hwmtx); 460 return (0); 461} 462 463static int 464vf_uart_bus_setsig(struct uart_softc *sc, int sig) 465{ 466 struct uart_bas *bas; 467 int reg; 468 469 /* TODO: implement (?) */ 470 471 /* XXX workaround to have working console on mount prompt */ 472 /* Enable RX interrupt */ 473 bas = &sc->sc_bas; 474 if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) { 475 reg = uart_getreg(bas, UART_C2); 476 reg |= (UART_C2_RIE); 477 uart_setreg(bas, UART_C2, reg); 478 } 479 480 return (0); 481} 482 483static int 484vf_uart_bus_transmit(struct uart_softc *sc) 485{ 486 struct uart_bas *bas = &sc->sc_bas; 487 int i; 488 int reg; 489 490 bas = &sc->sc_bas; 491 uart_lock(sc->sc_hwmtx); 492 493 /* Fill TX FIFO */ 494 for (i = 0; i < sc->sc_txdatasz; i++) { 495 uart_setreg(bas, UART_D, sc->sc_txbuf[i] & 0xff); 496 uart_barrier(&sc->sc_bas); 497 } 498 499 sc->sc_txbusy = 1; 500 501 /* Call me when ready */ 502 reg = uart_getreg(bas, UART_C2); 503 reg |= (UART_C2_TIE); 504 uart_setreg(bas, UART_C2, reg); 505 506 uart_unlock(sc->sc_hwmtx); 507 508 return (0); 509} 510