Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powernv/opal_console.c
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1 /*- 2 * Copyright (C) 2011,2015 by Nathan Whitehorn. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 17 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 18 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 19 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 20 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 21 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #include <sys/cdefs.h> 26 __FBSDID("$FreeBSD$"); 27 28 #include <sys/endian.h> 29 #include <sys/param.h> 30 #include <sys/conf.h> 31 #include <sys/cons.h> 32 #include <sys/kdb.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/module.h> 36 #include <sys/mutex.h> 37 #include <sys/priv.h> 38 #include <sys/proc.h> 39 #include <sys/systm.h> 40 #include <sys/tty.h> 41 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 45 #include <machine/bus.h> 46 47 #include <dev/ofw/openfirm.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 #include <dev/uart/uart.h> 51 #include <dev/uart/uart_cpu.h> 52 #include <dev/uart/uart_bus.h> 53 54 #include "opal.h" 55 #include "uart_if.h" 56 57 struct uart_opal_softc { 58 device_t dev; 59 phandle_t node; 60 int vtermid; 61 62 struct tty *tp; 63 struct resource *irqres; 64 int irqrid; 65 struct callout callout; 66 void *sc_icookie; 67 int polltime; 68 69 struct mtx sc_mtx; 70 int protocol; 71 72 char opal_inbuf[16]; 73 uint64_t inbuflen; 74 uint8_t outseqno; 75 #if defined(KDB) 76 int alt_break_state; 77 #endif 78 }; 79 80 static struct uart_opal_softc *console_sc = NULL; 81 static struct consdev *stdout_cp; 82 83 enum { 84 OPAL_RAW, OPAL_HVSI 85 }; 86 87 #define VS_DATA_PACKET_HEADER 0xff 88 #define VS_CONTROL_PACKET_HEADER 0xfe 89 #define VSV_SET_MODEM_CTL 0x01 90 #define VSV_MODEM_CTL_UPDATE 0x02 91 #define VSV_RENEGOTIATE_CONNECTION 0x03 92 #define VS_QUERY_PACKET_HEADER 0xfd 93 #define VSV_SEND_VERSION_NUMBER 0x01 94 #define VSV_SEND_MODEM_CTL_STATUS 0x02 95 #define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc 96 97 static int uart_opal_probe(device_t dev); 98 static int uart_opal_attach(device_t dev); 99 static void uart_opal_intr(void *v); 100 101 static device_method_t uart_opal_methods[] = { 102 /* Device interface */ 103 DEVMETHOD(device_probe, uart_opal_probe), 104 DEVMETHOD(device_attach, uart_opal_attach), 105 106 DEVMETHOD_END 107 }; 108 109 static driver_t uart_opal_driver = { 110 "uart", 111 uart_opal_methods, 112 sizeof(struct uart_opal_softc), 113 }; 114 115 DRIVER_MODULE(uart_opal, opalcons, uart_opal_driver, 0, 0); 116 117 static int uart_opal_getc(struct uart_opal_softc *sc); 118 static cn_probe_t uart_opal_cnprobe; 119 static cn_init_t uart_opal_cninit; 120 static cn_term_t uart_opal_cnterm; 121 static cn_getc_t uart_opal_cngetc; 122 static cn_putc_t uart_opal_cnputc; 123 static cn_grab_t uart_opal_cngrab; 124 static cn_ungrab_t uart_opal_cnungrab; 125 126 CONSOLE_DRIVER(uart_opal); 127 128 static void uart_opal_ttyoutwakeup(struct tty *tp); 129 130 static struct ttydevsw uart_opal_tty_class = { 131 .tsw_flags = TF_INITLOCK|TF_CALLOUT, 132 .tsw_outwakeup = uart_opal_ttyoutwakeup, 133 }; 134 135 static struct { 136 char tmpbuf[16]; 137 uint64_t size; 138 struct mtx mtx; 139 } opalcons_buffer; 140 141 static void 142 uart_opal_real_map_outbuffer(uint64_t *bufferp, uint64_t *lenp) 143 { 144 145 if (!mtx_initialized(&opalcons_buffer.mtx)) 146 mtx_init(&opalcons_buffer.mtx, "uart_opal", NULL, 147 MTX_SPIN | MTX_QUIET | MTX_NOWITNESS); 148 149 if (!pmap_bootstrapped) 150 return; 151 152 mtx_lock_spin(&opalcons_buffer.mtx); 153 154 opalcons_buffer.size = *(uint64_t *)(*lenp) = 155 min(sizeof(opalcons_buffer.tmpbuf), *(uint64_t *)(*lenp)); 156 memcpy(opalcons_buffer.tmpbuf, (void *)(*bufferp), 157 *(uint64_t *)(*lenp)); 158 *bufferp = (uint64_t)opalcons_buffer.tmpbuf; 159 *lenp = (uint64_t)&opalcons_buffer.size; 160 } 161 162 static void 163 uart_opal_real_unmap_outbuffer(uint64_t *len) 164 { 165 166 if (!pmap_bootstrapped) 167 return; 168 169 mtx_assert(&opalcons_buffer.mtx, MA_OWNED); 170 *len = opalcons_buffer.size; 171 mtx_unlock_spin(&opalcons_buffer.mtx); 172 } 173 174 static int64_t 175 uart_opal_console_write_buffer_space(int vtermid) 176 { 177 int64_t buffer_space_val = 0; 178 vm_paddr_t buffer_space_ptr; 179 180 if (pmap_bootstrapped) 181 buffer_space_ptr = vtophys(&buffer_space_val); 182 else 183 buffer_space_ptr = (vm_paddr_t)&buffer_space_val; 184 185 if (opal_call(OPAL_CONSOLE_WRITE_BUFFER_SPACE, vtermid, 186 buffer_space_ptr) != OPAL_SUCCESS) 187 return (-1); 188 189 return (be64toh(buffer_space_val)); 190 } 191 192 static int 193 uart_opal_probe_node(struct uart_opal_softc *sc) 194 { 195 phandle_t node = sc->node; 196 uint32_t reg; 197 char buf[64]; 198 199 sc->inbuflen = 0; 200 sc->outseqno = 0; 201 202 if (OF_getprop(node, "device_type", buf, sizeof(buf)) <= 0) 203 return (ENXIO); 204 if (strcmp(buf, "serial") != 0) 205 return (ENXIO); 206 207 reg = -1; 208 OF_getencprop(node, "reg", ®, sizeof(reg)); 209 if (reg == -1) 210 return (ENXIO); 211 sc->vtermid = reg; 212 sc->node = node; 213 214 if (OF_getprop(node, "compatible", buf, sizeof(buf)) <= 0) 215 return (ENXIO); 216 if (strcmp(buf, "ibm,opal-console-raw") == 0) { 217 sc->protocol = OPAL_RAW; 218 return (0); 219 } else if (strcmp(buf, "ibm,opal-console-hvsi") == 0) { 220 sc->protocol = OPAL_HVSI; 221 return (0); 222 } 223 224 return (ENXIO); 225 } 226 227 static int 228 uart_opal_probe(device_t dev) 229 { 230 struct uart_opal_softc sc; 231 int err; 232 233 sc.node = ofw_bus_get_node(dev); 234 err = uart_opal_probe_node(&sc); 235 if (err != 0) 236 return (err); 237 238 device_set_desc(dev, "OPAL Serial Port"); 239 240 return (err); 241 } 242 243 static void 244 uart_opal_cnprobe(struct consdev *cp) 245 { 246 char buf[64]; 247 phandle_t input, chosen; 248 static struct uart_opal_softc sc; 249 250 if (opal_check() != 0) 251 goto fail; 252 253 if ((chosen = OF_finddevice("/chosen")) == -1) 254 goto fail; 255 256 /* Check if OF has an active stdin/stdout */ 257 if (OF_getprop(chosen, "linux,stdout-path", buf, sizeof(buf)) <= 0) 258 goto fail; 259 260 input = OF_finddevice(buf); 261 if (input == -1) 262 goto fail; 263 264 sc.node = input; 265 if (uart_opal_probe_node(&sc) != 0) 266 goto fail; 267 mtx_init(&sc.sc_mtx, "uart_opal", NULL, MTX_SPIN | MTX_QUIET | 268 MTX_NOWITNESS); 269 270 cp->cn_pri = CN_NORMAL; 271 console_sc = ≻ 272 cp->cn_arg = console_sc; 273 stdout_cp = cp; 274 return; 275 276 fail: 277 cp->cn_pri = CN_DEAD; 278 return; 279 } 280 281 static int 282 uart_opal_attach(device_t dev) 283 { 284 struct uart_opal_softc *sc; 285 int unit; 286 287 sc = device_get_softc(dev); 288 sc->node = ofw_bus_get_node(dev); 289 uart_opal_probe_node(sc); 290 291 unit = device_get_unit(dev); 292 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, 293 MTX_SPIN | MTX_QUIET | MTX_NOWITNESS); 294 295 if (console_sc != NULL && console_sc->vtermid == sc->vtermid) { 296 device_printf(dev, "console\n"); 297 device_set_softc(dev, console_sc); 298 sc = console_sc; 299 sprintf(uart_opal_consdev.cn_name, "ttyu%r", unit); 300 } 301 sc->tp = tty_alloc(&uart_opal_tty_class, sc); 302 303 if (console_sc == sc) 304 tty_init_console(sc->tp, 0); 305 306 sc->dev = dev; 307 sc->irqrid = 0; 308 sc->irqres = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqrid, 309 RF_ACTIVE | RF_SHAREABLE); 310 if (sc->irqres != NULL) { 311 bus_setup_intr(dev, sc->irqres, INTR_TYPE_TTY | INTR_MPSAFE, 312 NULL, uart_opal_intr, sc, &sc->sc_icookie); 313 } else { 314 callout_init(&sc->callout, CALLOUT_MPSAFE); 315 sc->polltime = hz / 20; 316 if (sc->polltime < 1) 317 sc->polltime = 1; 318 callout_reset(&sc->callout, sc->polltime, uart_opal_intr, sc); 319 } 320 321 tty_makedev(sc->tp, NULL, "u%r", unit); 322 323 return (0); 324 } 325 326 static void 327 uart_opal_cninit(struct consdev *cp) 328 { 329 330 strcpy(cp->cn_name, "opalcons"); 331 } 332 333 static void 334 uart_opal_cnterm(struct consdev *cp) 335 { 336 } 337 338 static int 339 uart_opal_get(struct uart_opal_softc *sc, void *buffer, size_t bufsize) 340 { 341 int err; 342 int hdr = 0; 343 344 if (sc->protocol == OPAL_RAW) { 345 uint64_t len = htobe64(bufsize); 346 uint64_t olen = (uint64_t)&len; 347 uint64_t obuf = (uint64_t)buffer; 348 349 if (pmap_bootstrapped) { 350 olen = vtophys(&len); 351 obuf = vtophys(buffer); 352 } 353 354 err = opal_call(OPAL_CONSOLE_READ, sc->vtermid, olen, obuf); 355 if (err != OPAL_SUCCESS) 356 return (-1); 357 358 bufsize = be64toh(len); 359 } else { 360 uart_lock(&sc->sc_mtx); 361 if (sc->inbuflen == 0) { 362 err = opal_call(OPAL_CONSOLE_READ, sc->vtermid, 363 &sc->inbuflen, sc->opal_inbuf); 364 if (err != OPAL_SUCCESS) { 365 uart_unlock(&sc->sc_mtx); 366 return (-1); 367 } 368 hdr = 1; 369 sc->inbuflen = be64toh(sc->inbuflen); 370 } 371 372 if (sc->inbuflen == 0) { 373 uart_unlock(&sc->sc_mtx); 374 return (0); 375 } 376 377 if (bufsize > sc->inbuflen) 378 bufsize = sc->inbuflen; 379 380 if (hdr == 1) { 381 sc->inbuflen = sc->inbuflen - 4; 382 /* The HVSI protocol has a 4 byte header, skip it */ 383 memmove(&sc->opal_inbuf[0], &sc->opal_inbuf[4], 384 sc->inbuflen); 385 } 386 387 memcpy(buffer, sc->opal_inbuf, bufsize); 388 sc->inbuflen -= bufsize; 389 if (sc->inbuflen > 0) 390 memmove(&sc->opal_inbuf[0], &sc->opal_inbuf[bufsize], 391 sc->inbuflen); 392 393 uart_unlock(&sc->sc_mtx); 394 } 395 396 return (bufsize); 397 } 398 399 static int 400 uart_opal_put(struct uart_opal_softc *sc, void *buffer, size_t bufsize) 401 { 402 uint16_t seqno; 403 uint64_t len; 404 char cbuf[16]; 405 int err; 406 uint64_t olen = (uint64_t)&len; 407 uint64_t obuf = (uint64_t)cbuf; 408 409 if (sc->protocol == OPAL_RAW) { 410 obuf = (uint64_t)buffer; 411 len = bufsize; 412 413 uart_opal_real_map_outbuffer(&obuf, &olen); 414 *(uint64_t*)olen = htobe64(*(uint64_t*)olen); 415 err = opal_call(OPAL_CONSOLE_WRITE, sc->vtermid, olen, obuf); 416 *(uint64_t*)olen = be64toh(*(uint64_t*)olen); 417 uart_opal_real_unmap_outbuffer(&len); 418 } else { 419 uart_lock(&sc->sc_mtx); 420 if (bufsize > 12) 421 bufsize = 12; 422 seqno = sc->outseqno++; 423 cbuf[0] = VS_DATA_PACKET_HEADER; 424 cbuf[1] = 4 + bufsize; /* total length */ 425 cbuf[2] = (seqno >> 8) & 0xff; 426 cbuf[3] = seqno & 0xff; 427 memcpy(&cbuf[4], buffer, bufsize); 428 len = 4 + bufsize; 429 430 uart_opal_real_map_outbuffer(&obuf, &olen); 431 *(uint64_t*)olen = htobe64(*(uint64_t*)olen); 432 err = opal_call(OPAL_CONSOLE_WRITE, sc->vtermid, olen, obuf); 433 *(uint64_t*)olen = be64toh(*(uint64_t*)olen); 434 uart_opal_real_unmap_outbuffer(&len); 435 436 uart_unlock(&sc->sc_mtx); 437 438 len -= 4; 439 } 440 441 if (err == OPAL_SUCCESS) 442 return (len); 443 else if (err == OPAL_BUSY_EVENT) 444 return(0); 445 446 return (-1); 447 } 448 449 static int 450 uart_opal_cngetc(struct consdev *cp) 451 { 452 return (uart_opal_getc(cp->cn_arg)); 453 } 454 455 static int 456 uart_opal_getc(struct uart_opal_softc *sc) 457 { 458 unsigned char c; 459 int retval; 460 461 retval = uart_opal_get(sc, &c, 1); 462 if (retval != 1) 463 return (-1); 464 #if defined(KDB) 465 kdb_alt_break(c, &sc->alt_break_state); 466 #endif 467 468 return (c); 469 } 470 471 static void 472 uart_opal_cnputc(struct consdev *cp, int c) 473 { 474 unsigned char ch = c; 475 int a; 476 477 if (1) { 478 /* Clear FIFO if needed. Must be repeated few times. */ 479 for (a = 0; a < 20; a++) { 480 opal_call(OPAL_POLL_EVENTS, NULL); 481 } 482 } 483 uart_opal_put(cp->cn_arg, &ch, 1); 484 } 485 486 static void 487 uart_opal_cngrab(struct consdev *cp) 488 { 489 } 490 491 static void 492 uart_opal_cnungrab(struct consdev *cp) 493 { 494 } 495 496 static void 497 uart_opal_ttyoutwakeup(struct tty *tp) 498 { 499 struct uart_opal_softc *sc; 500 char buffer[8]; 501 int len; 502 int64_t buffer_space; 503 504 sc = tty_softc(tp); 505 506 while ((len = ttydisc_getc(tp, buffer, sizeof(buffer))) != 0) { 507 int bytes_written = 0; 508 while (bytes_written == 0) { 509 buffer_space = uart_opal_console_write_buffer_space(sc->vtermid); 510 if (buffer_space == -1) 511 /* OPAL failure or invalid terminal */ 512 break; 513 else if (buffer_space >= len) 514 bytes_written = uart_opal_put(sc, buffer, len); 515 516 if (bytes_written == 0) 517 /* OPAL must be busy, poll and retry */ 518 opal_call(OPAL_POLL_EVENTS, NULL); 519 else if (bytes_written == -1) 520 /* OPAL failure or invalid terminal */ 521 break; 522 } 523 } 524 } 525 526 static void 527 uart_opal_intr(void *v) 528 { 529 struct uart_opal_softc *sc = v; 530 struct tty *tp = sc->tp; 531 int c; 532 533 tty_lock(tp); 534 while ((c = uart_opal_getc(sc)) > 0) 535 ttydisc_rint(tp, c, 0); 536 ttydisc_rint_done(tp); 537 tty_unlock(tp); 538 539 opal_call(OPAL_POLL_EVENTS, NULL); 540 541 if (sc->irqres == NULL) 542 callout_reset(&sc->callout, sc->polltime, uart_opal_intr, sc); 543 } 544 545 static int 546 opalcons_probe(device_t dev) 547 { 548 const char *name; 549 550 name = ofw_bus_get_name(dev); 551 if (name == NULL || strcmp(name, "consoles") != 0) 552 return (ENXIO); 553 554 device_set_desc(dev, "OPAL Consoles"); 555 return (BUS_PROBE_SPECIFIC); 556 } 557 558 static int 559 opalcons_attach(device_t dev) 560 { 561 phandle_t child; 562 device_t cdev; 563 struct ofw_bus_devinfo *dinfo; 564 565 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 566 child = OF_peer(child)) { 567 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO); 568 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) { 569 free(dinfo, M_DEVBUF); 570 continue; 571 } 572 cdev = device_add_child(dev, NULL, -1); 573 if (cdev == NULL) { 574 device_printf(dev, "<%s>: device_add_child failed\n", 575 dinfo->obd_name); 576 ofw_bus_gen_destroy_devinfo(dinfo); 577 free(dinfo, M_DEVBUF); 578 continue; 579 } 580 device_set_ivars(cdev, dinfo); 581 } 582 583 return (bus_generic_attach(dev)); 584 } 585 586 static const struct ofw_bus_devinfo * 587 opalcons_get_devinfo(device_t dev, device_t child) 588 { 589 return (device_get_ivars(child)); 590 } 591 592 static device_method_t opalcons_methods[] = { 593 /* Device interface */ 594 DEVMETHOD(device_probe, opalcons_probe), 595 DEVMETHOD(device_attach, opalcons_attach), 596 597 /* ofw_bus interface */ 598 DEVMETHOD(ofw_bus_get_devinfo, opalcons_get_devinfo), 599 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 600 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 601 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 602 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 603 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 604 605 DEVMETHOD_END 606 }; 607 608 static driver_t opalcons_driver = { 609 "opalcons", 610 opalcons_methods, 611 0 612 }; 613 614 DRIVER_MODULE(opalcons, opal, opalcons_driver, 0, 0);
Cache object: 47cff4c1c1bc2573ac62069a64ecfaf4
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