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/chvgpio.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2017 Tom Jones <tj@enoti.me> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 /* 31 * Copyright (c) 2016 Mark Kettenis 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies. 36 * 37 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 38 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 39 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 40 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 42 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 43 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 44 */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/bus.h> 51 #include <sys/gpio.h> 52 #include <sys/clock.h> 53 #include <sys/kernel.h> 54 #include <sys/module.h> 55 #include <sys/endian.h> 56 #include <sys/rman.h> 57 #include <sys/types.h> 58 #include <sys/malloc.h> 59 60 #include <machine/bus.h> 61 #include <machine/resource.h> 62 63 #include <contrib/dev/acpica/include/acpi.h> 64 #include <contrib/dev/acpica/include/accommon.h> 65 66 #include <dev/acpica/acpivar.h> 67 #include <dev/gpio/gpiobusvar.h> 68 69 #include "opt_platform.h" 70 #include "opt_acpi.h" 71 #include "gpio_if.h" 72 73 #include "chvgpio_reg.h" 74 75 /* 76 * Macros for driver mutex locking 77 */ 78 #define CHVGPIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx) 79 #define CHVGPIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx) 80 #define CHVGPIO_LOCK_INIT(_sc) \ 81 mtx_init(&_sc->sc_mtx, device_get_nameunit((_sc)->sc_dev), \ 82 "chvgpio", MTX_SPIN) 83 #define CHVGPIO_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx) 84 #define CHVGPIO_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED) 85 #define CHVGPIO_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED) 86 87 struct chvgpio_softc { 88 device_t sc_dev; 89 device_t sc_busdev; 90 struct mtx sc_mtx; 91 92 ACPI_HANDLE sc_handle; 93 94 int sc_mem_rid; 95 struct resource *sc_mem_res; 96 97 int sc_irq_rid; 98 struct resource *sc_irq_res; 99 void *intr_handle; 100 101 const char *sc_bank_prefix; 102 const int *sc_pins; 103 int sc_npins; 104 int sc_ngroups; 105 const char **sc_pin_names; 106 }; 107 108 static void chvgpio_intr(void *); 109 static int chvgpio_probe(device_t); 110 static int chvgpio_attach(device_t); 111 static int chvgpio_detach(device_t); 112 113 static inline int 114 chvgpio_pad_cfg0_offset(int pin) 115 { 116 return (CHVGPIO_PAD_CFG0 + 1024 * (pin / 15) + 8 * (pin % 15)); 117 } 118 119 static inline int 120 chvgpio_read_pad_cfg0(struct chvgpio_softc *sc, int pin) 121 { 122 return bus_read_4(sc->sc_mem_res, chvgpio_pad_cfg0_offset(pin)); 123 } 124 125 static inline void 126 chvgpio_write_pad_cfg0(struct chvgpio_softc *sc, int pin, uint32_t val) 127 { 128 bus_write_4(sc->sc_mem_res, chvgpio_pad_cfg0_offset(pin), val); 129 } 130 131 static inline int 132 chvgpio_read_pad_cfg1(struct chvgpio_softc *sc, int pin) 133 { 134 return bus_read_4(sc->sc_mem_res, chvgpio_pad_cfg0_offset(pin) + 4); 135 } 136 137 static device_t 138 chvgpio_get_bus(device_t dev) 139 { 140 struct chvgpio_softc *sc; 141 142 sc = device_get_softc(dev); 143 144 return (sc->sc_busdev); 145 } 146 147 static int 148 chvgpio_pin_max(device_t dev, int *maxpin) 149 { 150 struct chvgpio_softc *sc; 151 152 sc = device_get_softc(dev); 153 154 *maxpin = sc->sc_npins - 1; 155 156 return (0); 157 } 158 159 static int 160 chvgpio_valid_pin(struct chvgpio_softc *sc, int pin) 161 { 162 if (pin < 0) 163 return EINVAL; 164 if ((pin / 15) >= sc->sc_ngroups) 165 return EINVAL; 166 if ((pin % 15) >= sc->sc_pins[pin / 15]) 167 return EINVAL; 168 return (0); 169 } 170 171 static int 172 chvgpio_pin_getname(device_t dev, uint32_t pin, char *name) 173 { 174 struct chvgpio_softc *sc; 175 176 sc = device_get_softc(dev); 177 if (chvgpio_valid_pin(sc, pin) != 0) 178 return (EINVAL); 179 180 /* return pin name from datasheet */ 181 snprintf(name, GPIOMAXNAME, "%s", sc->sc_pin_names[pin]); 182 name[GPIOMAXNAME - 1] = '\0'; 183 return (0); 184 } 185 186 static int 187 chvgpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) 188 { 189 struct chvgpio_softc *sc; 190 191 sc = device_get_softc(dev); 192 if (chvgpio_valid_pin(sc, pin) != 0) 193 return (EINVAL); 194 195 *caps = 0; 196 if (chvgpio_valid_pin(sc, pin)) 197 *caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT; 198 199 return (0); 200 } 201 202 static int 203 chvgpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) 204 { 205 struct chvgpio_softc *sc; 206 uint32_t val; 207 208 sc = device_get_softc(dev); 209 if (chvgpio_valid_pin(sc, pin) != 0) 210 return (EINVAL); 211 212 *flags = 0; 213 214 /* Get the current pin state */ 215 CHVGPIO_LOCK(sc); 216 val = chvgpio_read_pad_cfg0(sc, pin); 217 218 if (val & CHVGPIO_PAD_CFG0_GPIOCFG_GPIO || 219 val & CHVGPIO_PAD_CFG0_GPIOCFG_GPO) 220 *flags |= GPIO_PIN_OUTPUT; 221 222 if (val & CHVGPIO_PAD_CFG0_GPIOCFG_GPIO || 223 val & CHVGPIO_PAD_CFG0_GPIOCFG_GPI) 224 *flags |= GPIO_PIN_INPUT; 225 226 val = chvgpio_read_pad_cfg1(sc, pin); 227 228 CHVGPIO_UNLOCK(sc); 229 return (0); 230 } 231 232 static int 233 chvgpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) 234 { 235 struct chvgpio_softc *sc; 236 uint32_t val; 237 uint32_t allowed; 238 239 sc = device_get_softc(dev); 240 if (chvgpio_valid_pin(sc, pin) != 0) 241 return (EINVAL); 242 243 allowed = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT; 244 245 /* 246 * Only direction flag allowed 247 */ 248 if (flags & ~allowed) 249 return (EINVAL); 250 251 /* 252 * Not both directions simultaneously 253 */ 254 if ((flags & allowed) == allowed) 255 return (EINVAL); 256 257 /* Set the GPIO mode and state */ 258 CHVGPIO_LOCK(sc); 259 val = chvgpio_read_pad_cfg0(sc, pin); 260 if (flags & GPIO_PIN_INPUT) 261 val = val & CHVGPIO_PAD_CFG0_GPIOCFG_GPI; 262 if (flags & GPIO_PIN_OUTPUT) 263 val = val & CHVGPIO_PAD_CFG0_GPIOCFG_GPO; 264 chvgpio_write_pad_cfg0(sc, pin, val); 265 CHVGPIO_UNLOCK(sc); 266 267 return (0); 268 } 269 270 static int 271 chvgpio_pin_set(device_t dev, uint32_t pin, unsigned int value) 272 { 273 struct chvgpio_softc *sc; 274 uint32_t val; 275 276 sc = device_get_softc(dev); 277 if (chvgpio_valid_pin(sc, pin) != 0) 278 return (EINVAL); 279 280 CHVGPIO_LOCK(sc); 281 val = chvgpio_read_pad_cfg0(sc, pin); 282 if (value == GPIO_PIN_LOW) 283 val = val & ~CHVGPIO_PAD_CFG0_GPIOTXSTATE; 284 else 285 val = val | CHVGPIO_PAD_CFG0_GPIOTXSTATE; 286 chvgpio_write_pad_cfg0(sc, pin, val); 287 CHVGPIO_UNLOCK(sc); 288 289 return (0); 290 } 291 292 static int 293 chvgpio_pin_get(device_t dev, uint32_t pin, unsigned int *value) 294 { 295 struct chvgpio_softc *sc; 296 uint32_t val; 297 298 sc = device_get_softc(dev); 299 if (chvgpio_valid_pin(sc, pin) != 0) 300 return (EINVAL); 301 302 CHVGPIO_LOCK(sc); 303 304 /* Read pin value */ 305 val = chvgpio_read_pad_cfg0(sc, pin); 306 if (val & CHVGPIO_PAD_CFG0_GPIORXSTATE) 307 *value = GPIO_PIN_HIGH; 308 else 309 *value = GPIO_PIN_LOW; 310 311 CHVGPIO_UNLOCK(sc); 312 313 return (0); 314 } 315 316 static int 317 chvgpio_pin_toggle(device_t dev, uint32_t pin) 318 { 319 struct chvgpio_softc *sc; 320 uint32_t val; 321 322 sc = device_get_softc(dev); 323 if (chvgpio_valid_pin(sc, pin) != 0) 324 return (EINVAL); 325 326 CHVGPIO_LOCK(sc); 327 328 /* Toggle the pin */ 329 val = chvgpio_read_pad_cfg0(sc, pin); 330 val = val ^ CHVGPIO_PAD_CFG0_GPIOTXSTATE; 331 chvgpio_write_pad_cfg0(sc, pin, val); 332 333 CHVGPIO_UNLOCK(sc); 334 335 return (0); 336 } 337 338 static char *chvgpio_hids[] = { 339 "INT33FF", 340 NULL 341 }; 342 343 static int 344 chvgpio_probe(device_t dev) 345 { 346 if (acpi_disabled("chvgpio") || 347 ACPI_ID_PROBE(device_get_parent(dev), dev, chvgpio_hids) == NULL) 348 return (ENXIO); 349 350 device_set_desc(dev, "Intel Cherry View GPIO"); 351 return (0); 352 } 353 354 static int 355 chvgpio_attach(device_t dev) 356 { 357 struct chvgpio_softc *sc; 358 ACPI_STATUS status; 359 int uid; 360 int i; 361 int error; 362 363 sc = device_get_softc(dev); 364 sc->sc_dev = dev; 365 sc->sc_handle = acpi_get_handle(dev); 366 367 status = acpi_GetInteger(sc->sc_handle, "_UID", &uid); 368 if (ACPI_FAILURE(status)) { 369 device_printf(dev, "failed to read _UID\n"); 370 return (ENXIO); 371 } 372 373 CHVGPIO_LOCK_INIT(sc); 374 375 switch (uid) { 376 case SW_UID: 377 sc->sc_bank_prefix = SW_BANK_PREFIX; 378 sc->sc_pins = chv_southwest_pins; 379 sc->sc_pin_names = chv_southwest_pin_names; 380 break; 381 case N_UID: 382 sc->sc_bank_prefix = N_BANK_PREFIX; 383 sc->sc_pins = chv_north_pins; 384 sc->sc_pin_names = chv_north_pin_names; 385 break; 386 case E_UID: 387 sc->sc_bank_prefix = E_BANK_PREFIX; 388 sc->sc_pins = chv_east_pins; 389 sc->sc_pin_names = chv_east_pin_names; 390 break; 391 case SE_UID: 392 sc->sc_bank_prefix = SE_BANK_PREFIX; 393 sc->sc_pins = chv_southeast_pins; 394 sc->sc_pin_names = chv_southeast_pin_names; 395 break; 396 default: 397 device_printf(dev, "invalid _UID value: %d\n", uid); 398 return (ENXIO); 399 } 400 401 for (i = 0; sc->sc_pins[i] >= 0; i++) { 402 sc->sc_npins += sc->sc_pins[i]; 403 sc->sc_ngroups++; 404 } 405 406 sc->sc_mem_rid = 0; 407 sc->sc_mem_res = bus_alloc_resource_any(sc->sc_dev, SYS_RES_MEMORY, 408 &sc->sc_mem_rid, RF_ACTIVE); 409 if (sc->sc_mem_res == NULL) { 410 CHVGPIO_LOCK_DESTROY(sc); 411 device_printf(dev, "can't allocate memory resource\n"); 412 return (ENOMEM); 413 } 414 415 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, 416 &sc->sc_irq_rid, RF_ACTIVE); 417 418 if (!sc->sc_irq_res) { 419 CHVGPIO_LOCK_DESTROY(sc); 420 bus_release_resource(dev, SYS_RES_MEMORY, 421 sc->sc_mem_rid, sc->sc_mem_res); 422 device_printf(dev, "can't allocate irq resource\n"); 423 return (ENOMEM); 424 } 425 426 error = bus_setup_intr(sc->sc_dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 427 NULL, chvgpio_intr, sc, &sc->intr_handle); 428 429 430 if (error) { 431 device_printf(sc->sc_dev, "unable to setup irq: error %d\n", error); 432 CHVGPIO_LOCK_DESTROY(sc); 433 bus_release_resource(dev, SYS_RES_MEMORY, 434 sc->sc_mem_rid, sc->sc_mem_res); 435 bus_release_resource(dev, SYS_RES_IRQ, 436 sc->sc_irq_rid, sc->sc_irq_res); 437 return (ENXIO); 438 } 439 440 /* Mask and ack all interrupts. */ 441 bus_write_4(sc->sc_mem_res, CHVGPIO_INTERRUPT_MASK, 0); 442 bus_write_4(sc->sc_mem_res, CHVGPIO_INTERRUPT_STATUS, 0xffff); 443 444 sc->sc_busdev = gpiobus_attach_bus(dev); 445 if (sc->sc_busdev == NULL) { 446 CHVGPIO_LOCK_DESTROY(sc); 447 bus_release_resource(dev, SYS_RES_MEMORY, 448 sc->sc_mem_rid, sc->sc_mem_res); 449 bus_release_resource(dev, SYS_RES_IRQ, 450 sc->sc_irq_rid, sc->sc_irq_res); 451 return (ENXIO); 452 } 453 454 return (0); 455 } 456 457 static void 458 chvgpio_intr(void *arg) 459 { 460 struct chvgpio_softc *sc = arg; 461 uint32_t reg; 462 int line; 463 464 reg = bus_read_4(sc->sc_mem_res, CHVGPIO_INTERRUPT_STATUS); 465 for (line = 0; line < 16; line++) { 466 if ((reg & (1 << line)) == 0) 467 continue; 468 bus_write_4(sc->sc_mem_res, CHVGPIO_INTERRUPT_STATUS, 1 << line); 469 } 470 } 471 472 static int 473 chvgpio_detach(device_t dev) 474 { 475 struct chvgpio_softc *sc; 476 sc = device_get_softc(dev); 477 478 if (sc->sc_busdev) 479 gpiobus_detach_bus(dev); 480 481 if (sc->intr_handle != NULL) 482 bus_teardown_intr(sc->sc_dev, sc->sc_irq_res, sc->intr_handle); 483 if (sc->sc_irq_res != NULL) 484 bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid, sc->sc_irq_res); 485 if (sc->sc_mem_res != NULL) 486 bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid, sc->sc_mem_res); 487 488 CHVGPIO_LOCK_DESTROY(sc); 489 490 return (0); 491 } 492 493 static device_method_t chvgpio_methods[] = { 494 DEVMETHOD(device_probe, chvgpio_probe), 495 DEVMETHOD(device_attach, chvgpio_attach), 496 DEVMETHOD(device_detach, chvgpio_detach), 497 498 /* GPIO protocol */ 499 DEVMETHOD(gpio_get_bus, chvgpio_get_bus), 500 DEVMETHOD(gpio_pin_max, chvgpio_pin_max), 501 DEVMETHOD(gpio_pin_getname, chvgpio_pin_getname), 502 DEVMETHOD(gpio_pin_getflags, chvgpio_pin_getflags), 503 DEVMETHOD(gpio_pin_getcaps, chvgpio_pin_getcaps), 504 DEVMETHOD(gpio_pin_setflags, chvgpio_pin_setflags), 505 DEVMETHOD(gpio_pin_get, chvgpio_pin_get), 506 DEVMETHOD(gpio_pin_set, chvgpio_pin_set), 507 DEVMETHOD(gpio_pin_toggle, chvgpio_pin_toggle), 508 509 DEVMETHOD_END 510 }; 511 512 static driver_t chvgpio_driver = { 513 .name = "gpio", 514 .methods = chvgpio_methods, 515 .size = sizeof(struct chvgpio_softc) 516 }; 517 518 static devclass_t chvgpio_devclass; 519 DRIVER_MODULE(chvgpio, acpi, chvgpio_driver, chvgpio_devclass, NULL , NULL); 520 MODULE_DEPEND(chvgpio, acpi, 1, 1, 1); 521 MODULE_DEPEND(chvgpio, gpiobus, 1, 1, 1); 522 523 MODULE_VERSION(chvgpio, 1);
Cache object: 222258b27b4c8852244b161922046658
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