Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/adm5120/uart_dev_adm5120.c
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1 /* $NetBSD: uart.c,v 1.2 2007/03/23 20:05:47 dogcow Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko. 5 * Copyright (c) 2007 Oleksandr Tymoshenko. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or 9 * without modification, are permitted provided that the following 10 * conditions are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 * 3. The names of the authors may not be used to endorse or promote 18 * products derived from this software without specific prior 19 * written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY 22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 24 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 28 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 30 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 32 * OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/8.0/sys/mips/adm5120/uart_dev_adm5120.c 182901 2008-09-10 03:49:08Z gonzo $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/conf.h> 42 #include <machine/bus.h> 43 44 #include <dev/uart/uart.h> 45 #include <dev/uart/uart_cpu.h> 46 #include <dev/uart/uart_bus.h> 47 48 #include <mips/adm5120/uart_dev_adm5120.h> 49 50 #include "uart_if.h" 51 52 /* 53 * Low-level UART interface. 54 */ 55 static int adm5120_uart_probe(struct uart_bas *bas); 56 static void adm5120_uart_init(struct uart_bas *bas, int, int, int, int); 57 static void adm5120_uart_term(struct uart_bas *bas); 58 static void adm5120_uart_putc(struct uart_bas *bas, int); 59 static int adm5120_uart_rxready(struct uart_bas *bas); 60 static int adm5120_uart_getc(struct uart_bas *bas, struct mtx *); 61 62 static struct uart_ops uart_adm5120_uart_ops = { 63 .probe = adm5120_uart_probe, 64 .init = adm5120_uart_init, 65 .term = adm5120_uart_term, 66 .putc = adm5120_uart_putc, 67 .rxready = adm5120_uart_rxready, 68 .getc = adm5120_uart_getc, 69 }; 70 71 static int 72 adm5120_uart_probe(struct uart_bas *bas) 73 { 74 75 return (0); 76 } 77 78 static void 79 adm5120_uart_init(struct uart_bas *bas, int baudrate, int databits, 80 int stopbits, int parity) 81 { 82 83 /* TODO: Set parameters for uart, meanwhile stick with 115200N1 */ 84 } 85 86 static void 87 adm5120_uart_term(struct uart_bas *bas) 88 { 89 90 } 91 92 static void 93 adm5120_uart_putc(struct uart_bas *bas, int c) 94 { 95 char chr; 96 chr = c; 97 while (uart_getreg(bas, UART_FR_REG) & UART_FR_TX_FIFO_FULL) 98 ; 99 uart_setreg(bas, UART_DR_REG, c); 100 while (uart_getreg(bas, UART_FR_REG) & UART_FR_BUSY) 101 ; 102 uart_barrier(bas); 103 } 104 105 static int 106 adm5120_uart_rxready(struct uart_bas *bas) 107 { 108 if (uart_getreg(bas, UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) 109 return (0); 110 111 return (1); 112 } 113 114 static int 115 adm5120_uart_getc(struct uart_bas *bas, struct mtx *hwmtx) 116 { 117 int c; 118 119 uart_lock(hwmtx); 120 121 while (uart_getreg(bas, UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) { 122 uart_unlock(hwmtx); 123 DELAY(10); 124 uart_lock(hwmtx); 125 } 126 127 c = uart_getreg(bas, UART_DR_REG); 128 129 uart_unlock(hwmtx); 130 131 return (c); 132 } 133 134 /* 135 * High-level UART interface. 136 */ 137 struct adm5120_uart_softc { 138 struct uart_softc base; 139 }; 140 141 static int adm5120_uart_bus_attach(struct uart_softc *); 142 static int adm5120_uart_bus_detach(struct uart_softc *); 143 static int adm5120_uart_bus_flush(struct uart_softc *, int); 144 static int adm5120_uart_bus_getsig(struct uart_softc *); 145 static int adm5120_uart_bus_ioctl(struct uart_softc *, int, intptr_t); 146 static int adm5120_uart_bus_ipend(struct uart_softc *); 147 static int adm5120_uart_bus_param(struct uart_softc *, int, int, int, int); 148 static int adm5120_uart_bus_probe(struct uart_softc *); 149 static int adm5120_uart_bus_receive(struct uart_softc *); 150 static int adm5120_uart_bus_setsig(struct uart_softc *, int); 151 static int adm5120_uart_bus_transmit(struct uart_softc *); 152 153 static kobj_method_t adm5120_uart_methods[] = { 154 KOBJMETHOD(uart_attach, adm5120_uart_bus_attach), 155 KOBJMETHOD(uart_detach, adm5120_uart_bus_detach), 156 KOBJMETHOD(uart_flush, adm5120_uart_bus_flush), 157 KOBJMETHOD(uart_getsig, adm5120_uart_bus_getsig), 158 KOBJMETHOD(uart_ioctl, adm5120_uart_bus_ioctl), 159 KOBJMETHOD(uart_ipend, adm5120_uart_bus_ipend), 160 KOBJMETHOD(uart_param, adm5120_uart_bus_param), 161 KOBJMETHOD(uart_probe, adm5120_uart_bus_probe), 162 KOBJMETHOD(uart_receive, adm5120_uart_bus_receive), 163 KOBJMETHOD(uart_setsig, adm5120_uart_bus_setsig), 164 KOBJMETHOD(uart_transmit, adm5120_uart_bus_transmit), 165 { 0, 0 } 166 }; 167 168 struct uart_class uart_adm5120_uart_class = { 169 "adm5120", 170 adm5120_uart_methods, 171 sizeof(struct adm5120_uart_softc), 172 .uc_ops = &uart_adm5120_uart_ops, 173 .uc_range = 1, /* use hinted range */ 174 .uc_rclk = 62500000 175 }; 176 177 #define SIGCHG(c, i, s, d) \ 178 if (c) { \ 179 i |= (i & s) ? s : s | d; \ 180 } else { \ 181 i = (i & s) ? (i & ~s) | d : i; \ 182 } 183 184 /* 185 * Disable TX interrupt. uart should be locked 186 */ 187 static __inline void 188 adm5120_uart_disable_txintr(struct uart_softc *sc) 189 { 190 uint8_t cr; 191 192 cr = uart_getreg(&sc->sc_bas, UART_CR_REG); 193 cr &= ~UART_CR_TX_INT_EN; 194 uart_setreg(&sc->sc_bas, UART_CR_REG, cr); 195 } 196 197 /* 198 * Enable TX interrupt. uart should be locked 199 */ 200 static __inline void 201 adm5120_uart_enable_txintr(struct uart_softc *sc) 202 { 203 uint8_t cr; 204 205 cr = uart_getreg(&sc->sc_bas, UART_CR_REG); 206 cr |= UART_CR_TX_INT_EN; 207 uart_setreg(&sc->sc_bas, UART_CR_REG, cr); 208 } 209 210 static int 211 adm5120_uart_bus_attach(struct uart_softc *sc) 212 { 213 struct uart_bas *bas; 214 struct uart_devinfo *di; 215 216 bas = &sc->sc_bas; 217 if (sc->sc_sysdev != NULL) { 218 di = sc->sc_sysdev; 219 /* TODO: set parameters from di */ 220 } else { 221 /* TODO: set parameters 115200, 8N1 */ 222 } 223 224 sc->sc_rxfifosz = 16; 225 sc->sc_txfifosz = 16; 226 227 (void)adm5120_uart_bus_getsig(sc); 228 229 #if 1 230 /* Enable FIFO */ 231 uart_setreg(bas, UART_LCR_H_REG, 232 uart_getreg(bas, UART_LCR_H_REG) | UART_LCR_H_FEN); 233 #endif 234 /* Enable interrupts */ 235 uart_setreg(bas, UART_CR_REG, 236 UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN| 237 UART_CR_MODEM_STATUS_INT_EN); 238 239 return (0); 240 } 241 242 static int 243 adm5120_uart_bus_detach(struct uart_softc *sc) 244 { 245 246 return (0); 247 } 248 249 static int 250 adm5120_uart_bus_flush(struct uart_softc *sc, int what) 251 { 252 253 return (0); 254 } 255 256 static int 257 adm5120_uart_bus_getsig(struct uart_softc *sc) 258 { 259 uint32_t new, old, sig; 260 uint8_t bes; 261 262 do { 263 old = sc->sc_hwsig; 264 sig = old; 265 uart_lock(sc->sc_hwmtx); 266 bes = uart_getreg(&sc->sc_bas, UART_FR_REG); 267 uart_unlock(sc->sc_hwmtx); 268 SIGCHG(bes & UART_FR_CTS, sig, SER_CTS, SER_DCTS); 269 SIGCHG(bes & UART_FR_DCD, sig, SER_DCD, SER_DDCD); 270 SIGCHG(bes & UART_FR_DSR, sig, SER_DSR, SER_DDSR); 271 new = sig & ~SER_MASK_DELTA; 272 } while (!atomic_cmpset_32(&sc->sc_hwsig, old, new)); 273 274 return (sig); 275 } 276 277 static int 278 adm5120_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data) 279 { 280 struct uart_bas *bas; 281 int baudrate, divisor, error; 282 283 bas = &sc->sc_bas; 284 error = 0; 285 uart_lock(sc->sc_hwmtx); 286 switch (request) { 287 case UART_IOCTL_BREAK: 288 /* TODO: Send BREAK */ 289 break; 290 case UART_IOCTL_BAUD: 291 divisor = uart_getreg(bas, UART_LCR_M_REG); 292 divisor = (divisor << 8) | 293 uart_getreg(bas, UART_LCR_L_REG); 294 baudrate = bas->rclk / 2 / (divisor + 2); 295 *(int*)data = baudrate; 296 break; 297 default: 298 error = EINVAL; 299 break; 300 } 301 uart_unlock(sc->sc_hwmtx); 302 return (error); 303 } 304 305 static int 306 adm5120_uart_bus_ipend(struct uart_softc *sc) 307 { 308 struct uart_bas *bas; 309 int ipend; 310 uint8_t ir, fr, rsr; 311 312 bas = &sc->sc_bas; 313 ipend = 0; 314 315 uart_lock(sc->sc_hwmtx); 316 ir = uart_getreg(&sc->sc_bas, UART_IR_REG); 317 fr = uart_getreg(&sc->sc_bas, UART_FR_REG); 318 rsr = uart_getreg(&sc->sc_bas, UART_RSR_REG); 319 320 if (ir & UART_IR_RX_INT) 321 ipend |= SER_INT_RXREADY; 322 323 if (ir & UART_IR_RX_TIMEOUT_INT) 324 ipend |= SER_INT_RXREADY; 325 326 if (ir & UART_IR_MODEM_STATUS_INT) 327 ipend |= SER_INT_SIGCHG; 328 329 if (rsr & UART_RSR_BE) 330 ipend |= SER_INT_BREAK; 331 332 if (rsr & UART_RSR_OE) 333 ipend |= SER_INT_OVERRUN; 334 335 if (fr & UART_FR_TX_FIFO_EMPTY) { 336 if (ir & UART_IR_TX_INT) { 337 adm5120_uart_disable_txintr(sc); 338 ipend |= SER_INT_TXIDLE; 339 } 340 } 341 342 if (ipend) 343 uart_setreg(bas, UART_IR_REG, ir | UART_IR_UICR); 344 345 uart_unlock(sc->sc_hwmtx); 346 347 return (ipend); 348 } 349 350 static int 351 adm5120_uart_bus_param(struct uart_softc *sc, int baudrate, int databits, 352 int stopbits, int parity) 353 { 354 355 /* TODO: Set parameters for uart, meanwhile stick with 115200 8N1 */ 356 return (0); 357 } 358 359 static int 360 adm5120_uart_bus_probe(struct uart_softc *sc) 361 { 362 char buf[80]; 363 int error; 364 char ch; 365 366 error = adm5120_uart_probe(&sc->sc_bas); 367 if (error) 368 return (error); 369 370 ch = sc->sc_bas.chan + 'A'; 371 372 snprintf(buf, sizeof(buf), "adm5120_uart, channel %c", ch); 373 device_set_desc_copy(sc->sc_dev, buf); 374 375 return (0); 376 } 377 378 static int 379 adm5120_uart_bus_receive(struct uart_softc *sc) 380 { 381 struct uart_bas *bas; 382 int xc; 383 uint8_t fr, rsr; 384 385 bas = &sc->sc_bas; 386 uart_lock(sc->sc_hwmtx); 387 fr = uart_getreg(bas, UART_FR_REG); 388 while (!(fr & UART_FR_RX_FIFO_EMPTY)) { 389 if (uart_rx_full(sc)) { 390 sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; 391 break; 392 } 393 xc = 0; 394 rsr = uart_getreg(bas, UART_RSR_REG); 395 if (rsr & UART_RSR_FE) 396 xc |= UART_STAT_FRAMERR; 397 if (rsr & UART_RSR_PE) 398 xc |= UART_STAT_PARERR; 399 if (rsr & UART_RSR_OE) 400 xc |= UART_STAT_OVERRUN; 401 xc |= uart_getreg(bas, UART_DR_REG); 402 uart_barrier(bas); 403 uart_rx_put(sc, xc); 404 if (rsr & (UART_RSR_FE | UART_RSR_PE | UART_RSR_OE)) { 405 uart_setreg(bas, UART_ECR_REG, UART_ECR_RSR); 406 uart_barrier(bas); 407 } 408 fr = uart_getreg(bas, UART_FR_REG); 409 } 410 411 /* Discard everything left in the Rx FIFO. */ 412 while (!(fr & UART_FR_RX_FIFO_EMPTY)) { 413 ( void)uart_getreg(bas, UART_DR_REG); 414 uart_barrier(bas); 415 rsr = uart_getreg(bas, UART_RSR_REG); 416 if (rsr & (UART_RSR_FE | UART_RSR_PE | UART_RSR_OE)) { 417 uart_setreg(bas, UART_ECR_REG, UART_ECR_RSR); 418 uart_barrier(bas); 419 } 420 fr = uart_getreg(bas, UART_FR_REG); 421 } 422 uart_unlock(sc->sc_hwmtx); 423 return (0); 424 } 425 426 static int 427 adm5120_uart_bus_setsig(struct uart_softc *sc, int sig) 428 { 429 430 /* TODO: implement (?) */ 431 return (0); 432 } 433 434 static int 435 adm5120_uart_bus_transmit(struct uart_softc *sc) 436 { 437 struct uart_bas *bas; 438 439 bas = &sc->sc_bas; 440 uart_lock(sc->sc_hwmtx); 441 sc->sc_txbusy = 1; 442 for (int i = 0; i < sc->sc_txdatasz; i++) { 443 if (uart_getreg(bas, UART_FR_REG) & UART_FR_TX_FIFO_FULL) 444 break; 445 uart_setreg(bas, UART_DR_REG, sc->sc_txbuf[i]); 446 } 447 448 /* Enable TX interrupt */ 449 adm5120_uart_enable_txintr(sc); 450 uart_unlock(sc->sc_hwmtx); 451 return (0); 452 }
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