Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/gpio/ofw_gpiobus.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org> 5 * Copyright (c) 2013, Luiz Otavio O Souza <loos@FreeBSD.org> 6 * Copyright (c) 2013 The FreeBSD Foundation 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 41 #include <dev/gpio/gpiobusvar.h> 42 #include <dev/ofw/ofw_bus.h> 43 44 #include "gpiobus_if.h" 45 46 static struct ofw_gpiobus_devinfo *ofw_gpiobus_setup_devinfo(device_t, 47 device_t, phandle_t); 48 static void ofw_gpiobus_destroy_devinfo(device_t, struct ofw_gpiobus_devinfo *); 49 static int ofw_gpiobus_parse_gpios_impl(device_t, phandle_t, char *, 50 struct gpiobus_softc *, struct gpiobus_pin **); 51 52 /* 53 * Utility functions for easier handling of OFW GPIO pins. 54 * 55 * !!! BEWARE !!! 56 * GPIOBUS uses children's IVARs, so we cannot use this interface for cross 57 * tree consumers. 58 * 59 */ 60 int 61 gpio_pin_get_by_ofw_propidx(device_t consumer, phandle_t cnode, 62 char *prop_name, int idx, gpio_pin_t *out_pin) 63 { 64 phandle_t xref; 65 pcell_t *cells; 66 device_t busdev; 67 struct gpiobus_pin pin; 68 int ncells, rv; 69 70 KASSERT(consumer != NULL && cnode > 0, 71 ("both consumer and cnode required")); 72 73 rv = ofw_bus_parse_xref_list_alloc(cnode, prop_name, "#gpio-cells", 74 idx, &xref, &ncells, &cells); 75 if (rv != 0) 76 return (rv); 77 78 /* Translate provider to device. */ 79 pin.dev = OF_device_from_xref(xref); 80 if (pin.dev == NULL) { 81 OF_prop_free(cells); 82 return (ENODEV); 83 } 84 85 /* Test if GPIO bus already exist. */ 86 busdev = GPIO_GET_BUS(pin.dev); 87 if (busdev == NULL) { 88 OF_prop_free(cells); 89 return (ENODEV); 90 } 91 92 /* Map GPIO pin. */ 93 rv = gpio_map_gpios(pin.dev, cnode, OF_node_from_xref(xref), ncells, 94 cells, &pin.pin, &pin.flags); 95 OF_prop_free(cells); 96 if (rv != 0) 97 return (ENXIO); 98 99 /* Reserve GPIO pin. */ 100 rv = gpiobus_acquire_pin(busdev, pin.pin); 101 if (rv != 0) 102 return (EBUSY); 103 104 *out_pin = malloc(sizeof(struct gpiobus_pin), M_DEVBUF, 105 M_WAITOK | M_ZERO); 106 **out_pin = pin; 107 return (0); 108 } 109 110 int 111 gpio_pin_get_by_ofw_idx(device_t consumer, phandle_t node, 112 int idx, gpio_pin_t *pin) 113 { 114 115 return (gpio_pin_get_by_ofw_propidx(consumer, node, "gpios", idx, pin)); 116 } 117 118 int 119 gpio_pin_get_by_ofw_property(device_t consumer, phandle_t node, 120 char *name, gpio_pin_t *pin) 121 { 122 123 return (gpio_pin_get_by_ofw_propidx(consumer, node, name, 0, pin)); 124 } 125 126 int 127 gpio_pin_get_by_ofw_name(device_t consumer, phandle_t node, 128 char *name, gpio_pin_t *pin) 129 { 130 int rv, idx; 131 132 KASSERT(consumer != NULL && node > 0, 133 ("both consumer and node required")); 134 135 rv = ofw_bus_find_string_index(node, "gpio-names", name, &idx); 136 if (rv != 0) 137 return (rv); 138 return (gpio_pin_get_by_ofw_idx(consumer, node, idx, pin)); 139 } 140 141 /* 142 * OFW_GPIOBUS driver. 143 */ 144 device_t 145 ofw_gpiobus_add_fdt_child(device_t bus, const char *drvname, phandle_t child) 146 { 147 device_t childdev; 148 int i; 149 struct gpiobus_ivar *devi; 150 struct ofw_gpiobus_devinfo *dinfo; 151 152 /* 153 * Check to see if we already have a child for @p child, and if so 154 * return it. 155 */ 156 childdev = ofw_bus_find_child_device_by_phandle(bus, child); 157 if (childdev != NULL) 158 return (childdev); 159 160 /* 161 * Set up the GPIO child and OFW bus layer devinfo and add it to bus. 162 */ 163 childdev = device_add_child(bus, drvname, -1); 164 if (childdev == NULL) 165 return (NULL); 166 dinfo = ofw_gpiobus_setup_devinfo(bus, childdev, child); 167 if (dinfo == NULL) { 168 device_delete_child(bus, childdev); 169 return (NULL); 170 } 171 if (device_probe_and_attach(childdev) != 0) { 172 ofw_gpiobus_destroy_devinfo(bus, dinfo); 173 device_delete_child(bus, childdev); 174 return (NULL); 175 } 176 /* Use the child name as pin name. */ 177 devi = &dinfo->opd_dinfo; 178 for (i = 0; i < devi->npins; i++) 179 GPIOBUS_PIN_SETNAME(bus, devi->pins[i], 180 device_get_nameunit(childdev)); 181 182 return (childdev); 183 } 184 185 int 186 ofw_gpiobus_parse_gpios(device_t consumer, char *pname, 187 struct gpiobus_pin **pins) 188 { 189 190 return (ofw_gpiobus_parse_gpios_impl(consumer, 191 ofw_bus_get_node(consumer), pname, NULL, pins)); 192 } 193 194 void 195 ofw_gpiobus_register_provider(device_t provider) 196 { 197 phandle_t node; 198 199 node = ofw_bus_get_node(provider); 200 if (node != -1) 201 OF_device_register_xref(OF_xref_from_node(node), provider); 202 } 203 204 void 205 ofw_gpiobus_unregister_provider(device_t provider) 206 { 207 phandle_t node; 208 209 node = ofw_bus_get_node(provider); 210 if (node != -1) 211 OF_device_register_xref(OF_xref_from_node(node), NULL); 212 } 213 214 static struct ofw_gpiobus_devinfo * 215 ofw_gpiobus_setup_devinfo(device_t bus, device_t child, phandle_t node) 216 { 217 int i, npins; 218 struct gpiobus_ivar *devi; 219 struct gpiobus_pin *pins; 220 struct gpiobus_softc *sc; 221 struct ofw_gpiobus_devinfo *dinfo; 222 223 sc = device_get_softc(bus); 224 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_NOWAIT | M_ZERO); 225 if (dinfo == NULL) 226 return (NULL); 227 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, node) != 0) { 228 free(dinfo, M_DEVBUF); 229 return (NULL); 230 } 231 /* Parse the gpios property for the child. */ 232 npins = ofw_gpiobus_parse_gpios_impl(child, node, "gpios", sc, &pins); 233 if (npins <= 0) { 234 ofw_bus_gen_destroy_devinfo(&dinfo->opd_obdinfo); 235 free(dinfo, M_DEVBUF); 236 return (NULL); 237 } 238 /* Initialize the irq resource list. */ 239 resource_list_init(&dinfo->opd_dinfo.rl); 240 /* Allocate the child ivars and copy the parsed pin data. */ 241 devi = &dinfo->opd_dinfo; 242 devi->npins = (uint32_t)npins; 243 if (gpiobus_alloc_ivars(devi) != 0) { 244 free(pins, M_DEVBUF); 245 ofw_gpiobus_destroy_devinfo(bus, dinfo); 246 return (NULL); 247 } 248 for (i = 0; i < devi->npins; i++) 249 devi->pins[i] = pins[i].pin; 250 free(pins, M_DEVBUF); 251 /* Parse the interrupt resources. */ 252 if (ofw_bus_intr_to_rl(bus, node, &dinfo->opd_dinfo.rl, NULL) != 0) { 253 ofw_gpiobus_destroy_devinfo(bus, dinfo); 254 return (NULL); 255 } 256 device_set_ivars(child, dinfo); 257 258 return (dinfo); 259 } 260 261 static void 262 ofw_gpiobus_destroy_devinfo(device_t bus, struct ofw_gpiobus_devinfo *dinfo) 263 { 264 int i; 265 struct gpiobus_ivar *devi; 266 struct gpiobus_softc *sc; 267 268 sc = device_get_softc(bus); 269 devi = &dinfo->opd_dinfo; 270 for (i = 0; i < devi->npins; i++) { 271 if (devi->pins[i] > sc->sc_npins) 272 continue; 273 sc->sc_pins[devi->pins[i]].mapped = 0; 274 } 275 gpiobus_free_ivars(devi); 276 resource_list_free(&dinfo->opd_dinfo.rl); 277 ofw_bus_gen_destroy_devinfo(&dinfo->opd_obdinfo); 278 free(dinfo, M_DEVBUF); 279 } 280 281 static int 282 ofw_gpiobus_parse_gpios_impl(device_t consumer, phandle_t cnode, char *pname, 283 struct gpiobus_softc *bussc, struct gpiobus_pin **pins) 284 { 285 int gpiocells, i, j, ncells, npins; 286 pcell_t *gpios; 287 phandle_t gpio; 288 289 ncells = OF_getencprop_alloc_multi(cnode, pname, sizeof(*gpios), 290 (void **)&gpios); 291 if (ncells == -1) { 292 device_printf(consumer, 293 "Warning: No %s specified in fdt data; " 294 "device may not function.\n", pname); 295 return (-1); 296 } 297 /* 298 * The gpio-specifier is controller independent, the first pcell has 299 * the reference to the GPIO controller phandler. 300 * Count the number of encoded gpio-specifiers on the first pass. 301 */ 302 i = 0; 303 npins = 0; 304 while (i < ncells) { 305 /* Allow NULL specifiers. */ 306 if (gpios[i] == 0) { 307 npins++; 308 i++; 309 continue; 310 } 311 gpio = OF_node_from_xref(gpios[i]); 312 /* If we have bussc, ignore devices from other gpios. */ 313 if (bussc != NULL) 314 if (ofw_bus_get_node(bussc->sc_dev) != gpio) 315 return (0); 316 /* 317 * Check for gpio-controller property and read the #gpio-cells 318 * for this GPIO controller. 319 */ 320 if (!OF_hasprop(gpio, "gpio-controller") || 321 OF_getencprop(gpio, "#gpio-cells", &gpiocells, 322 sizeof(gpiocells)) < 0) { 323 device_printf(consumer, 324 "gpio reference is not a gpio-controller.\n"); 325 OF_prop_free(gpios); 326 return (-1); 327 } 328 if (ncells - i < gpiocells + 1) { 329 device_printf(consumer, 330 "%s cells doesn't match #gpio-cells.\n", pname); 331 return (-1); 332 } 333 npins++; 334 i += gpiocells + 1; 335 } 336 if (npins == 0 || pins == NULL) { 337 if (npins == 0) 338 device_printf(consumer, "no pin specified in %s.\n", 339 pname); 340 OF_prop_free(gpios); 341 return (npins); 342 } 343 *pins = malloc(sizeof(struct gpiobus_pin) * npins, M_DEVBUF, 344 M_NOWAIT | M_ZERO); 345 if (*pins == NULL) { 346 OF_prop_free(gpios); 347 return (-1); 348 } 349 /* Decode the gpio specifier on the second pass. */ 350 i = 0; 351 j = 0; 352 while (i < ncells) { 353 /* Allow NULL specifiers. */ 354 if (gpios[i] == 0) { 355 j++; 356 i++; 357 continue; 358 } 359 gpio = OF_node_from_xref(gpios[i]); 360 /* Read gpio-cells property for this GPIO controller. */ 361 if (OF_getencprop(gpio, "#gpio-cells", &gpiocells, 362 sizeof(gpiocells)) < 0) { 363 device_printf(consumer, 364 "gpio does not have the #gpio-cells property.\n"); 365 goto fail; 366 } 367 /* Return the device reference for the GPIO controller. */ 368 (*pins)[j].dev = OF_device_from_xref(gpios[i]); 369 if ((*pins)[j].dev == NULL) { 370 device_printf(consumer, 371 "no device registered for the gpio controller.\n"); 372 goto fail; 373 } 374 /* 375 * If the gpiobus softc is NULL we use the GPIO_GET_BUS() to 376 * retrieve it. The GPIO_GET_BUS() method is only valid after 377 * the child is probed and attached. 378 */ 379 if (bussc == NULL) { 380 if (GPIO_GET_BUS((*pins)[j].dev) == NULL) { 381 device_printf(consumer, 382 "no gpiobus reference for %s.\n", 383 device_get_nameunit((*pins)[j].dev)); 384 goto fail; 385 } 386 bussc = device_get_softc(GPIO_GET_BUS((*pins)[j].dev)); 387 } 388 /* Get the GPIO pin number and flags. */ 389 if (gpio_map_gpios((*pins)[j].dev, cnode, gpio, gpiocells, 390 &gpios[i + 1], &(*pins)[j].pin, &(*pins)[j].flags) != 0) { 391 device_printf(consumer, 392 "cannot map the gpios specifier.\n"); 393 goto fail; 394 } 395 /* Reserve the GPIO pin. */ 396 if (gpiobus_acquire_pin(bussc->sc_busdev, (*pins)[j].pin) != 0) 397 goto fail; 398 j++; 399 i += gpiocells + 1; 400 } 401 OF_prop_free(gpios); 402 403 return (npins); 404 405 fail: 406 OF_prop_free(gpios); 407 free(*pins, M_DEVBUF); 408 return (-1); 409 } 410 411 static int 412 ofw_gpiobus_probe(device_t dev) 413 { 414 415 if (ofw_bus_get_node(dev) == -1) 416 return (ENXIO); 417 device_set_desc(dev, "OFW GPIO bus"); 418 419 return (BUS_PROBE_DEFAULT); 420 } 421 422 static int 423 ofw_gpiobus_attach(device_t dev) 424 { 425 int err; 426 phandle_t child; 427 428 err = gpiobus_init_softc(dev); 429 if (err != 0) 430 return (err); 431 bus_generic_probe(dev); 432 bus_enumerate_hinted_children(dev); 433 /* 434 * Attach the children represented in the device tree. 435 */ 436 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 437 child = OF_peer(child)) { 438 if (OF_hasprop(child, "gpio-hog")) 439 continue; 440 if (!OF_hasprop(child, "gpios")) 441 continue; 442 if (ofw_gpiobus_add_fdt_child(dev, NULL, child) == NULL) 443 continue; 444 } 445 446 return (bus_generic_attach(dev)); 447 } 448 449 static device_t 450 ofw_gpiobus_add_child(device_t dev, u_int order, const char *name, int unit) 451 { 452 device_t child; 453 struct ofw_gpiobus_devinfo *devi; 454 455 child = device_add_child_ordered(dev, order, name, unit); 456 if (child == NULL) 457 return (child); 458 devi = malloc(sizeof(struct ofw_gpiobus_devinfo), M_DEVBUF, 459 M_NOWAIT | M_ZERO); 460 if (devi == NULL) { 461 device_delete_child(dev, child); 462 return (0); 463 } 464 465 /* 466 * NULL all the OFW-related parts of the ivars for non-OFW 467 * children. 468 */ 469 devi->opd_obdinfo.obd_node = -1; 470 devi->opd_obdinfo.obd_name = NULL; 471 devi->opd_obdinfo.obd_compat = NULL; 472 devi->opd_obdinfo.obd_type = NULL; 473 devi->opd_obdinfo.obd_model = NULL; 474 475 device_set_ivars(child, devi); 476 477 return (child); 478 } 479 480 static const struct ofw_bus_devinfo * 481 ofw_gpiobus_get_devinfo(device_t bus, device_t dev) 482 { 483 struct ofw_gpiobus_devinfo *dinfo; 484 485 dinfo = device_get_ivars(dev); 486 487 return (&dinfo->opd_obdinfo); 488 } 489 490 static device_method_t ofw_gpiobus_methods[] = { 491 /* Device interface */ 492 DEVMETHOD(device_probe, ofw_gpiobus_probe), 493 DEVMETHOD(device_attach, ofw_gpiobus_attach), 494 495 /* Bus interface */ 496 DEVMETHOD(bus_child_pnpinfo, ofw_bus_gen_child_pnpinfo), 497 DEVMETHOD(bus_add_child, ofw_gpiobus_add_child), 498 499 /* ofw_bus interface */ 500 DEVMETHOD(ofw_bus_get_devinfo, ofw_gpiobus_get_devinfo), 501 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 502 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 503 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 504 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 505 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 506 507 DEVMETHOD_END 508 }; 509 510 DEFINE_CLASS_1(gpiobus, ofw_gpiobus_driver, ofw_gpiobus_methods, 511 sizeof(struct gpiobus_softc), gpiobus_driver); 512 EARLY_DRIVER_MODULE(ofw_gpiobus, gpio, ofw_gpiobus_driver, 0, 0, BUS_PASS_BUS); 513 MODULE_VERSION(ofw_gpiobus, 1); 514 MODULE_DEPEND(ofw_gpiobus, gpiobus, 1, 1, 1);
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