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