1 /*- 2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org> 3 * Copyright (c) 2012 Luiz Otavio O Souza. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/rman.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/gpio.h> 41 #include <sys/sysctl.h> 42 43 #include <machine/bus.h> 44 #include <machine/cpu.h> 45 #include <machine/cpufunc.h> 46 #include <machine/resource.h> 47 #include <machine/fdt.h> 48 #include <machine/intr.h> 49 50 #include <dev/fdt/fdt_common.h> 51 #include <dev/ofw/ofw_bus.h> 52 #include <dev/ofw/ofw_bus_subr.h> 53 54 #include <arm/broadcom/bcm2835/bcm2835_gpio.h> 55 56 #include "gpio_if.h" 57 58 #ifdef DEBUG 59 #define dprintf(fmt, args...) do { printf("%s(): ", __func__); \ 60 printf(fmt,##args); } while (0) 61 #else 62 #define dprintf(fmt, args...) 63 #endif 64 65 #define BCM_GPIO_PINS 54 66 #define BCM_GPIO_DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \ 67 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN) 68 69 struct bcm_gpio_sysctl { 70 struct bcm_gpio_softc *sc; 71 uint32_t pin; 72 }; 73 74 struct bcm_gpio_softc { 75 device_t sc_dev; 76 struct mtx sc_mtx; 77 struct resource * sc_mem_res; 78 struct resource * sc_irq_res; 79 bus_space_tag_t sc_bst; 80 bus_space_handle_t sc_bsh; 81 void * sc_intrhand; 82 int sc_gpio_npins; 83 int sc_ro_npins; 84 int sc_ro_pins[BCM_GPIO_PINS]; 85 struct gpio_pin sc_gpio_pins[BCM_GPIO_PINS]; 86 struct bcm_gpio_sysctl sc_sysctl[BCM_GPIO_PINS]; 87 }; 88 89 enum bcm_gpio_pud { 90 BCM_GPIO_NONE, 91 BCM_GPIO_PULLDOWN, 92 BCM_GPIO_PULLUP, 93 }; 94 95 #define BCM_GPIO_LOCK(_sc) mtx_lock(&_sc->sc_mtx) 96 #define BCM_GPIO_UNLOCK(_sc) mtx_unlock(&_sc->sc_mtx) 97 #define BCM_GPIO_LOCK_ASSERT(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED) 98 99 #define BCM_GPIO_GPFSEL(_bank) 0x00 + _bank * 4 100 #define BCM_GPIO_GPSET(_bank) 0x1c + _bank * 4 101 #define BCM_GPIO_GPCLR(_bank) 0x28 + _bank * 4 102 #define BCM_GPIO_GPLEV(_bank) 0x34 + _bank * 4 103 #define BCM_GPIO_GPPUD(_bank) 0x94 104 #define BCM_GPIO_GPPUDCLK(_bank) 0x98 + _bank * 4 105 106 #define BCM_GPIO_WRITE(_sc, _off, _val) \ 107 bus_space_write_4(_sc->sc_bst, _sc->sc_bsh, _off, _val) 108 #define BCM_GPIO_READ(_sc, _off) \ 109 bus_space_read_4(_sc->sc_bst, _sc->sc_bsh, _off) 110 111 static int 112 bcm_gpio_pin_is_ro(struct bcm_gpio_softc *sc, int pin) 113 { 114 int i; 115 116 for (i = 0; i < sc->sc_ro_npins; i++) 117 if (pin == sc->sc_ro_pins[i]) 118 return (1); 119 return (0); 120 } 121 122 static uint32_t 123 bcm_gpio_get_function(struct bcm_gpio_softc *sc, uint32_t pin) 124 { 125 uint32_t bank, func, offset; 126 127 /* Five banks, 10 pins per bank, 3 bits per pin. */ 128 bank = pin / 10; 129 offset = (pin - bank * 10) * 3; 130 131 BCM_GPIO_LOCK(sc); 132 func = (BCM_GPIO_READ(sc, BCM_GPIO_GPFSEL(bank)) >> offset) & 7; 133 BCM_GPIO_UNLOCK(sc); 134 135 return (func); 136 } 137 138 static void 139 bcm_gpio_func_str(uint32_t nfunc, char *buf, int bufsize) 140 { 141 142 switch (nfunc) { 143 case BCM_GPIO_INPUT: 144 strncpy(buf, "input", bufsize); 145 break; 146 case BCM_GPIO_OUTPUT: 147 strncpy(buf, "output", bufsize); 148 break; 149 case BCM_GPIO_ALT0: 150 strncpy(buf, "alt0", bufsize); 151 break; 152 case BCM_GPIO_ALT1: 153 strncpy(buf, "alt1", bufsize); 154 break; 155 case BCM_GPIO_ALT2: 156 strncpy(buf, "alt2", bufsize); 157 break; 158 case BCM_GPIO_ALT3: 159 strncpy(buf, "alt3", bufsize); 160 break; 161 case BCM_GPIO_ALT4: 162 strncpy(buf, "alt4", bufsize); 163 break; 164 case BCM_GPIO_ALT5: 165 strncpy(buf, "alt5", bufsize); 166 break; 167 default: 168 strncpy(buf, "invalid", bufsize); 169 } 170 } 171 172 static int 173 bcm_gpio_str_func(char *func, uint32_t *nfunc) 174 { 175 176 if (strcasecmp(func, "input") == 0) 177 *nfunc = BCM_GPIO_INPUT; 178 else if (strcasecmp(func, "output") == 0) 179 *nfunc = BCM_GPIO_OUTPUT; 180 else if (strcasecmp(func, "alt0") == 0) 181 *nfunc = BCM_GPIO_ALT0; 182 else if (strcasecmp(func, "alt1") == 0) 183 *nfunc = BCM_GPIO_ALT1; 184 else if (strcasecmp(func, "alt2") == 0) 185 *nfunc = BCM_GPIO_ALT2; 186 else if (strcasecmp(func, "alt3") == 0) 187 *nfunc = BCM_GPIO_ALT3; 188 else if (strcasecmp(func, "alt4") == 0) 189 *nfunc = BCM_GPIO_ALT4; 190 else if (strcasecmp(func, "alt5") == 0) 191 *nfunc = BCM_GPIO_ALT5; 192 else 193 return (-1); 194 195 return (0); 196 } 197 198 static uint32_t 199 bcm_gpio_func_flag(uint32_t nfunc) 200 { 201 202 switch (nfunc) { 203 case BCM_GPIO_INPUT: 204 return (GPIO_PIN_INPUT); 205 case BCM_GPIO_OUTPUT: 206 return (GPIO_PIN_OUTPUT); 207 } 208 return (0); 209 } 210 211 static void 212 bcm_gpio_set_function(struct bcm_gpio_softc *sc, uint32_t pin, uint32_t f) 213 { 214 uint32_t bank, data, offset; 215 216 /* Must be called with lock held. */ 217 BCM_GPIO_LOCK_ASSERT(sc); 218 219 /* Five banks, 10 pins per bank, 3 bits per pin. */ 220 bank = pin / 10; 221 offset = (pin - bank * 10) * 3; 222 223 data = BCM_GPIO_READ(sc, BCM_GPIO_GPFSEL(bank)); 224 data &= ~(7 << offset); 225 data |= (f << offset); 226 BCM_GPIO_WRITE(sc, BCM_GPIO_GPFSEL(bank), data); 227 } 228 229 static void 230 bcm_gpio_set_pud(struct bcm_gpio_softc *sc, uint32_t pin, uint32_t state) 231 { 232 uint32_t bank, offset; 233 234 /* Must be called with lock held. */ 235 BCM_GPIO_LOCK_ASSERT(sc); 236 237 bank = pin / 32; 238 offset = pin - 32 * bank; 239 240 BCM_GPIO_WRITE(sc, BCM_GPIO_GPPUD(0), state); 241 DELAY(10); 242 BCM_GPIO_WRITE(sc, BCM_GPIO_GPPUDCLK(bank), (1 << offset)); 243 DELAY(10); 244 BCM_GPIO_WRITE(sc, BCM_GPIO_GPPUD(0), 0); 245 BCM_GPIO_WRITE(sc, BCM_GPIO_GPPUDCLK(bank), 0); 246 } 247 248 void 249 bcm_gpio_set_alternate(device_t dev, uint32_t pin, uint32_t nfunc) 250 { 251 struct bcm_gpio_softc *sc; 252 int i; 253 254 sc = device_get_softc(dev); 255 BCM_GPIO_LOCK(sc); 256 257 /* Disable pull-up or pull-down on pin. */ 258 bcm_gpio_set_pud(sc, pin, BCM_GPIO_NONE); 259 260 /* And now set the pin function. */ 261 bcm_gpio_set_function(sc, pin, nfunc); 262 263 /* Update the pin flags. */ 264 for (i = 0; i < sc->sc_gpio_npins; i++) { 265 if (sc->sc_gpio_pins[i].gp_pin == pin) 266 break; 267 } 268 if (i < sc->sc_gpio_npins) 269 sc->sc_gpio_pins[i].gp_flags = bcm_gpio_func_flag(nfunc); 270 271 BCM_GPIO_UNLOCK(sc); 272 } 273 274 static void 275 bcm_gpio_pin_configure(struct bcm_gpio_softc *sc, struct gpio_pin *pin, 276 unsigned int flags) 277 { 278 279 BCM_GPIO_LOCK(sc); 280 281 /* 282 * Manage input/output. 283 */ 284 if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) { 285 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT); 286 if (flags & GPIO_PIN_OUTPUT) { 287 pin->gp_flags |= GPIO_PIN_OUTPUT; 288 bcm_gpio_set_function(sc, pin->gp_pin, 289 BCM_GPIO_OUTPUT); 290 } else { 291 pin->gp_flags |= GPIO_PIN_INPUT; 292 bcm_gpio_set_function(sc, pin->gp_pin, 293 BCM_GPIO_INPUT); 294 } 295 } 296 297 /* Manage Pull-up/pull-down. */ 298 pin->gp_flags &= ~(GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN); 299 if (flags & (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) { 300 if (flags & GPIO_PIN_PULLUP) { 301 pin->gp_flags |= GPIO_PIN_PULLUP; 302 bcm_gpio_set_pud(sc, pin->gp_pin, BCM_GPIO_PULLUP); 303 } else { 304 pin->gp_flags |= GPIO_PIN_PULLDOWN; 305 bcm_gpio_set_pud(sc, pin->gp_pin, BCM_GPIO_PULLDOWN); 306 } 307 } else 308 bcm_gpio_set_pud(sc, pin->gp_pin, BCM_GPIO_NONE); 309 310 BCM_GPIO_UNLOCK(sc); 311 } 312 313 static int 314 bcm_gpio_pin_max(device_t dev, int *maxpin) 315 { 316 317 *maxpin = BCM_GPIO_PINS - 1; 318 return (0); 319 } 320 321 static int 322 bcm_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) 323 { 324 struct bcm_gpio_softc *sc = device_get_softc(dev); 325 int i; 326 327 for (i = 0; i < sc->sc_gpio_npins; i++) { 328 if (sc->sc_gpio_pins[i].gp_pin == pin) 329 break; 330 } 331 332 if (i >= sc->sc_gpio_npins) 333 return (EINVAL); 334 335 BCM_GPIO_LOCK(sc); 336 *caps = sc->sc_gpio_pins[i].gp_caps; 337 BCM_GPIO_UNLOCK(sc); 338 339 return (0); 340 } 341 342 static int 343 bcm_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) 344 { 345 struct bcm_gpio_softc *sc = device_get_softc(dev); 346 int i; 347 348 for (i = 0; i < sc->sc_gpio_npins; i++) { 349 if (sc->sc_gpio_pins[i].gp_pin == pin) 350 break; 351 } 352 353 if (i >= sc->sc_gpio_npins) 354 return (EINVAL); 355 356 BCM_GPIO_LOCK(sc); 357 *flags = sc->sc_gpio_pins[i].gp_flags; 358 BCM_GPIO_UNLOCK(sc); 359 360 return (0); 361 } 362 363 static int 364 bcm_gpio_pin_getname(device_t dev, uint32_t pin, char *name) 365 { 366 struct bcm_gpio_softc *sc = device_get_softc(dev); 367 int i; 368 369 for (i = 0; i < sc->sc_gpio_npins; i++) { 370 if (sc->sc_gpio_pins[i].gp_pin == pin) 371 break; 372 } 373 374 if (i >= sc->sc_gpio_npins) 375 return (EINVAL); 376 377 BCM_GPIO_LOCK(sc); 378 memcpy(name, sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME); 379 BCM_GPIO_UNLOCK(sc); 380 381 return (0); 382 } 383 384 static int 385 bcm_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) 386 { 387 struct bcm_gpio_softc *sc = device_get_softc(dev); 388 int i; 389 390 for (i = 0; i < sc->sc_gpio_npins; i++) { 391 if (sc->sc_gpio_pins[i].gp_pin == pin) 392 break; 393 } 394 395 if (i >= sc->sc_gpio_npins) 396 return (EINVAL); 397 398 /* We never touch on read-only/reserved pins. */ 399 if (bcm_gpio_pin_is_ro(sc, pin)) 400 return (EINVAL); 401 402 /* Check for unwanted flags. */ 403 if ((flags & sc->sc_gpio_pins[i].gp_caps) != flags) 404 return (EINVAL); 405 406 /* Can't mix input/output together. */ 407 if ((flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) == 408 (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) 409 return (EINVAL); 410 411 /* Can't mix pull-up/pull-down together. */ 412 if ((flags & (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) == 413 (GPIO_PIN_PULLUP|GPIO_PIN_PULLDOWN)) 414 return (EINVAL); 415 416 bcm_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags); 417 418 return (0); 419 } 420 421 static int 422 bcm_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value) 423 { 424 struct bcm_gpio_softc *sc = device_get_softc(dev); 425 uint32_t bank, offset; 426 int i; 427 428 for (i = 0; i < sc->sc_gpio_npins; i++) { 429 if (sc->sc_gpio_pins[i].gp_pin == pin) 430 break; 431 } 432 433 if (i >= sc->sc_gpio_npins) 434 return (EINVAL); 435 436 /* We never write to read-only/reserved pins. */ 437 if (bcm_gpio_pin_is_ro(sc, pin)) 438 return (EINVAL); 439 440 bank = pin / 32; 441 offset = pin - 32 * bank; 442 443 BCM_GPIO_LOCK(sc); 444 if (value) 445 BCM_GPIO_WRITE(sc, BCM_GPIO_GPSET(bank), (1 << offset)); 446 else 447 BCM_GPIO_WRITE(sc, BCM_GPIO_GPCLR(bank), (1 << offset)); 448 BCM_GPIO_UNLOCK(sc); 449 450 return (0); 451 } 452 453 static int 454 bcm_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val) 455 { 456 struct bcm_gpio_softc *sc = device_get_softc(dev); 457 uint32_t bank, offset, reg_data; 458 int i; 459 460 for (i = 0; i < sc->sc_gpio_npins; i++) { 461 if (sc->sc_gpio_pins[i].gp_pin == pin) 462 break; 463 } 464 465 if (i >= sc->sc_gpio_npins) 466 return (EINVAL); 467 468 bank = pin / 32; 469 offset = pin - 32 * bank; 470 471 BCM_GPIO_LOCK(sc); 472 reg_data = BCM_GPIO_READ(sc, BCM_GPIO_GPLEV(bank)); 473 BCM_GPIO_UNLOCK(sc); 474 *val = (reg_data & (1 << offset)) ? 1 : 0; 475 476 return (0); 477 } 478 479 static int 480 bcm_gpio_pin_toggle(device_t dev, uint32_t pin) 481 { 482 struct bcm_gpio_softc *sc = device_get_softc(dev); 483 uint32_t bank, data, offset; 484 int i; 485 486 for (i = 0; i < sc->sc_gpio_npins; i++) { 487 if (sc->sc_gpio_pins[i].gp_pin == pin) 488 break; 489 } 490 491 if (i >= sc->sc_gpio_npins) 492 return (EINVAL); 493 494 /* We never write to read-only/reserved pins. */ 495 if (bcm_gpio_pin_is_ro(sc, pin)) 496 return (EINVAL); 497 498 bank = pin / 32; 499 offset = pin - 32 * bank; 500 501 BCM_GPIO_LOCK(sc); 502 data = BCM_GPIO_READ(sc, BCM_GPIO_GPLEV(bank)); 503 if (data & (1 << offset)) 504 BCM_GPIO_WRITE(sc, BCM_GPIO_GPCLR(bank), (1 << offset)); 505 else 506 BCM_GPIO_WRITE(sc, BCM_GPIO_GPSET(bank), (1 << offset)); 507 BCM_GPIO_UNLOCK(sc); 508 509 return (0); 510 } 511 512 static int 513 bcm_gpio_get_ro_pins(struct bcm_gpio_softc *sc) 514 { 515 int i, len; 516 pcell_t pins[BCM_GPIO_PINS]; 517 phandle_t gpio; 518 519 /* Find the gpio node to start. */ 520 gpio = ofw_bus_get_node(sc->sc_dev); 521 522 len = OF_getproplen(gpio, "broadcom,read-only"); 523 if (len < 0 || len > sizeof(pins)) 524 return (-1); 525 526 if (OF_getprop(gpio, "broadcom,read-only", &pins, len) < 0) 527 return (-1); 528 529 sc->sc_ro_npins = len / sizeof(pcell_t); 530 531 device_printf(sc->sc_dev, "read-only pins: "); 532 for (i = 0; i < sc->sc_ro_npins; i++) { 533 sc->sc_ro_pins[i] = fdt32_to_cpu(pins[i]); 534 if (i > 0) 535 printf(","); 536 printf("%d", sc->sc_ro_pins[i]); 537 } 538 if (i > 0) 539 printf("."); 540 printf("\n"); 541 542 return (0); 543 } 544 545 static int 546 bcm_gpio_func_proc(SYSCTL_HANDLER_ARGS) 547 { 548 char buf[16]; 549 struct bcm_gpio_softc *sc; 550 struct bcm_gpio_sysctl *sc_sysctl; 551 uint32_t nfunc; 552 int error; 553 554 sc_sysctl = arg1; 555 sc = sc_sysctl->sc; 556 557 /* Get the current pin function. */ 558 nfunc = bcm_gpio_get_function(sc, sc_sysctl->pin); 559 bcm_gpio_func_str(nfunc, buf, sizeof(buf)); 560 561 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 562 if (error != 0 || req->newptr == NULL) 563 return (error); 564 565 /* Parse the user supplied string and check for a valid pin function. */ 566 if (bcm_gpio_str_func(buf, &nfunc) != 0) 567 return (EINVAL); 568 569 /* Update the pin alternate function. */ 570 bcm_gpio_set_alternate(sc->sc_dev, sc_sysctl->pin, nfunc); 571 572 return (0); 573 } 574 575 static void 576 bcm_gpio_sysctl_init(struct bcm_gpio_softc *sc) 577 { 578 char pinbuf[3]; 579 struct bcm_gpio_sysctl *sc_sysctl; 580 struct sysctl_ctx_list *ctx; 581 struct sysctl_oid *tree_node, *pin_node, *pinN_node; 582 struct sysctl_oid_list *tree, *pin_tree, *pinN_tree; 583 int i; 584 585 /* 586 * Add per-pin sysctl tree/handlers. 587 */ 588 ctx = device_get_sysctl_ctx(sc->sc_dev); 589 tree_node = device_get_sysctl_tree(sc->sc_dev); 590 tree = SYSCTL_CHILDREN(tree_node); 591 pin_node = SYSCTL_ADD_NODE(ctx, tree, OID_AUTO, "pin", 592 CTLFLAG_RD, NULL, "GPIO Pins"); 593 pin_tree = SYSCTL_CHILDREN(pin_node); 594 595 for (i = 0; i < sc->sc_gpio_npins; i++) { 596 597 snprintf(pinbuf, sizeof(pinbuf), "%d", i); 598 pinN_node = SYSCTL_ADD_NODE(ctx, pin_tree, OID_AUTO, pinbuf, 599 CTLFLAG_RD, NULL, "GPIO Pin"); 600 pinN_tree = SYSCTL_CHILDREN(pinN_node); 601 602 sc->sc_sysctl[i].sc = sc; 603 sc_sysctl = &sc->sc_sysctl[i]; 604 sc_sysctl->sc = sc; 605 sc_sysctl->pin = sc->sc_gpio_pins[i].gp_pin; 606 SYSCTL_ADD_PROC(ctx, pinN_tree, OID_AUTO, "function", 607 CTLFLAG_RW | CTLTYPE_STRING, sc_sysctl, 608 sizeof(struct bcm_gpio_sysctl), bcm_gpio_func_proc, 609 "A", "Pin Function"); 610 } 611 } 612 613 static int 614 bcm_gpio_get_reserved_pins(struct bcm_gpio_softc *sc) 615 { 616 int i, j, len, npins; 617 pcell_t pins[BCM_GPIO_PINS]; 618 phandle_t gpio, node, reserved; 619 char name[32]; 620 621 /* Get read-only pins. */ 622 if (bcm_gpio_get_ro_pins(sc) != 0) 623 return (-1); 624 625 /* Find the gpio/reserved pins node to start. */ 626 gpio = ofw_bus_get_node(sc->sc_dev); 627 node = OF_child(gpio); 628 629 /* 630 * Find reserved node 631 */ 632 reserved = 0; 633 while ((node != 0) && (reserved == 0)) { 634 len = OF_getprop(node, "name", name, 635 sizeof(name) - 1); 636 name[len] = 0; 637 if (strcmp(name, "reserved") == 0) 638 reserved = node; 639 node = OF_peer(node); 640 } 641 642 if (reserved == 0) 643 return (-1); 644 645 /* Get the reserved pins. */ 646 len = OF_getproplen(reserved, "broadcom,pins"); 647 if (len < 0 || len > sizeof(pins)) 648 return (-1); 649 650 if (OF_getprop(reserved, "broadcom,pins", &pins, len) < 0) 651 return (-1); 652 653 npins = len / sizeof(pcell_t); 654 655 j = 0; 656 device_printf(sc->sc_dev, "reserved pins: "); 657 for (i = 0; i < npins; i++) { 658 if (i > 0) 659 printf(","); 660 printf("%d", fdt32_to_cpu(pins[i])); 661 /* Some pins maybe already on the list of read-only pins. */ 662 if (bcm_gpio_pin_is_ro(sc, fdt32_to_cpu(pins[i]))) 663 continue; 664 sc->sc_ro_pins[j++ + sc->sc_ro_npins] = fdt32_to_cpu(pins[i]); 665 } 666 sc->sc_ro_npins += j; 667 if (i > 0) 668 printf("."); 669 printf("\n"); 670 671 return (0); 672 } 673 674 static int 675 bcm_gpio_probe(device_t dev) 676 { 677 678 if (!ofw_bus_status_okay(dev)) 679 return (ENXIO); 680 681 if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-gpio")) 682 return (ENXIO); 683 684 device_set_desc(dev, "BCM2708/2835 GPIO controller"); 685 return (BUS_PROBE_DEFAULT); 686 } 687 688 static int 689 bcm_gpio_attach(device_t dev) 690 { 691 struct bcm_gpio_softc *sc = device_get_softc(dev); 692 uint32_t func; 693 int i, j, rid; 694 phandle_t gpio; 695 696 sc->sc_dev = dev; 697 698 mtx_init(&sc->sc_mtx, "bcm gpio", "gpio", MTX_DEF); 699 700 rid = 0; 701 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 702 RF_ACTIVE); 703 if (!sc->sc_mem_res) { 704 device_printf(dev, "cannot allocate memory window\n"); 705 return (ENXIO); 706 } 707 708 sc->sc_bst = rman_get_bustag(sc->sc_mem_res); 709 sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res); 710 711 rid = 0; 712 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 713 RF_ACTIVE); 714 if (!sc->sc_irq_res) { 715 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 716 device_printf(dev, "cannot allocate interrupt\n"); 717 return (ENXIO); 718 } 719 720 /* Find our node. */ 721 gpio = ofw_bus_get_node(sc->sc_dev); 722 723 if (!OF_hasprop(gpio, "gpio-controller")) 724 /* Node is not a GPIO controller. */ 725 goto fail; 726 727 /* 728 * Find the read-only pins. These are pins we never touch or bad 729 * things could happen. 730 */ 731 if (bcm_gpio_get_reserved_pins(sc) == -1) 732 goto fail; 733 734 /* Initialize the software controlled pins. */ 735 for (i = 0, j = 0; j < BCM_GPIO_PINS; j++) { 736 if (bcm_gpio_pin_is_ro(sc, j)) 737 continue; 738 snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME, 739 "pin %d", j); 740 func = bcm_gpio_get_function(sc, j); 741 sc->sc_gpio_pins[i].gp_pin = j; 742 sc->sc_gpio_pins[i].gp_caps = BCM_GPIO_DEFAULT_CAPS; 743 sc->sc_gpio_pins[i].gp_flags = bcm_gpio_func_flag(func); 744 i++; 745 } 746 sc->sc_gpio_npins = i; 747 748 bcm_gpio_sysctl_init(sc); 749 750 device_add_child(dev, "gpioc", device_get_unit(dev)); 751 device_add_child(dev, "gpiobus", device_get_unit(dev)); 752 return (bus_generic_attach(dev)); 753 754 fail: 755 if (sc->sc_irq_res) 756 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res); 757 if (sc->sc_mem_res) 758 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 759 return (ENXIO); 760 } 761 762 static int 763 bcm_gpio_detach(device_t dev) 764 { 765 766 return (EBUSY); 767 } 768 769 static phandle_t 770 bcm_gpio_get_node(device_t bus, device_t dev) 771 { 772 773 /* We only have one child, the GPIO bus, which needs our own node. */ 774 return (ofw_bus_get_node(bus)); 775 } 776 777 static device_method_t bcm_gpio_methods[] = { 778 /* Device interface */ 779 DEVMETHOD(device_probe, bcm_gpio_probe), 780 DEVMETHOD(device_attach, bcm_gpio_attach), 781 DEVMETHOD(device_detach, bcm_gpio_detach), 782 783 /* GPIO protocol */ 784 DEVMETHOD(gpio_pin_max, bcm_gpio_pin_max), 785 DEVMETHOD(gpio_pin_getname, bcm_gpio_pin_getname), 786 DEVMETHOD(gpio_pin_getflags, bcm_gpio_pin_getflags), 787 DEVMETHOD(gpio_pin_getcaps, bcm_gpio_pin_getcaps), 788 DEVMETHOD(gpio_pin_setflags, bcm_gpio_pin_setflags), 789 DEVMETHOD(gpio_pin_get, bcm_gpio_pin_get), 790 DEVMETHOD(gpio_pin_set, bcm_gpio_pin_set), 791 DEVMETHOD(gpio_pin_toggle, bcm_gpio_pin_toggle), 792 793 /* ofw_bus interface */ 794 DEVMETHOD(ofw_bus_get_node, bcm_gpio_get_node), 795 796 DEVMETHOD_END 797 }; 798 799 static devclass_t bcm_gpio_devclass; 800 801 static driver_t bcm_gpio_driver = { 802 "gpio", 803 bcm_gpio_methods, 804 sizeof(struct bcm_gpio_softc), 805 }; 806 807 DRIVER_MODULE(bcm_gpio, simplebus, bcm_gpio_driver, bcm_gpio_devclass, 0, 0); 808