vf_gpio.c revision 303975
1/*- 2 * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * Vybrid Family General-Purpose Input/Output (GPIO) 29 * Chapter 7, Vybrid Reference Manual, Rev. 5, 07/2013 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/vybrid/vf_gpio.c 281085 2015-04-04 21:34:26Z andrew $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/bus.h> 38#include <sys/kernel.h> 39#include <sys/module.h> 40#include <sys/malloc.h> 41#include <sys/rman.h> 42#include <sys/timeet.h> 43#include <sys/timetc.h> 44#include <sys/watchdog.h> 45#include <sys/mutex.h> 46#include <sys/gpio.h> 47 48#include <dev/fdt/fdt_common.h> 49#include <dev/gpio/gpiobusvar.h> 50#include <dev/ofw/openfirm.h> 51#include <dev/ofw/ofw_bus.h> 52#include <dev/ofw/ofw_bus_subr.h> 53 54#include <machine/bus.h> 55#include <machine/cpu.h> 56#include <machine/intr.h> 57 58#include "gpio_if.h" 59 60#include <arm/freescale/vybrid/vf_common.h> 61#include <arm/freescale/vybrid/vf_port.h> 62 63#define GPIO_PDOR(n) (0x00 + 0x40 * (n >> 5)) 64#define GPIO_PSOR(n) (0x04 + 0x40 * (n >> 5)) 65#define GPIO_PCOR(n) (0x08 + 0x40 * (n >> 5)) 66#define GPIO_PTOR(n) (0x0C + 0x40 * (n >> 5)) 67#define GPIO_PDIR(n) (0x10 + 0x40 * (n >> 5)) 68 69#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 70#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 71 72#define DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT) 73 74/* 75 * GPIO interface 76 */ 77static device_t vf_gpio_get_bus(device_t); 78static int vf_gpio_pin_max(device_t, int *); 79static int vf_gpio_pin_getcaps(device_t, uint32_t, uint32_t *); 80static int vf_gpio_pin_getname(device_t, uint32_t, char *); 81static int vf_gpio_pin_getflags(device_t, uint32_t, uint32_t *); 82static int vf_gpio_pin_setflags(device_t, uint32_t, uint32_t); 83static int vf_gpio_pin_set(device_t, uint32_t, unsigned int); 84static int vf_gpio_pin_get(device_t, uint32_t, unsigned int *); 85static int vf_gpio_pin_toggle(device_t, uint32_t pin); 86 87struct vf_gpio_softc { 88 struct resource *res[1]; 89 bus_space_tag_t bst; 90 bus_space_handle_t bsh; 91 92 device_t sc_busdev; 93 struct mtx sc_mtx; 94 int gpio_npins; 95 struct gpio_pin gpio_pins[NGPIO]; 96}; 97 98struct vf_gpio_softc *gpio_sc; 99 100static struct resource_spec vf_gpio_spec[] = { 101 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 102 { -1, 0 } 103}; 104 105static int 106vf_gpio_probe(device_t dev) 107{ 108 109 if (!ofw_bus_status_okay(dev)) 110 return (ENXIO); 111 112 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-gpio")) 113 return (ENXIO); 114 115 device_set_desc(dev, "Vybrid Family GPIO Unit"); 116 return (BUS_PROBE_DEFAULT); 117} 118 119static int 120vf_gpio_attach(device_t dev) 121{ 122 struct vf_gpio_softc *sc; 123 int i; 124 125 sc = device_get_softc(dev); 126 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF); 127 128 if (bus_alloc_resources(dev, vf_gpio_spec, sc->res)) { 129 device_printf(dev, "could not allocate resources\n"); 130 mtx_destroy(&sc->sc_mtx); 131 return (ENXIO); 132 } 133 134 /* Memory interface */ 135 sc->bst = rman_get_bustag(sc->res[0]); 136 sc->bsh = rman_get_bushandle(sc->res[0]); 137 138 gpio_sc = sc; 139 140 sc->gpio_npins = NGPIO; 141 142 for (i = 0; i < sc->gpio_npins; i++) { 143 sc->gpio_pins[i].gp_pin = i; 144 sc->gpio_pins[i].gp_caps = DEFAULT_CAPS; 145 sc->gpio_pins[i].gp_flags = 146 (READ4(sc, GPIO_PDOR(i)) & (1 << (i % 32))) ? 147 GPIO_PIN_OUTPUT: GPIO_PIN_INPUT; 148 snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME, 149 "vf_gpio%d.%d", device_get_unit(dev), i); 150 } 151 152 sc->sc_busdev = gpiobus_attach_bus(dev); 153 if (sc->sc_busdev == NULL) { 154 bus_release_resources(dev, vf_gpio_spec, sc->res); 155 mtx_destroy(&sc->sc_mtx); 156 return (ENXIO); 157 } 158 159 return (0); 160} 161 162static device_t 163vf_gpio_get_bus(device_t dev) 164{ 165 struct vf_gpio_softc *sc; 166 167 sc = device_get_softc(dev); 168 169 return (sc->sc_busdev); 170} 171 172static int 173vf_gpio_pin_max(device_t dev, int *maxpin) 174{ 175 176 *maxpin = NGPIO - 1; 177 return (0); 178} 179 180static int 181vf_gpio_pin_getname(device_t dev, uint32_t pin, char *name) 182{ 183 struct vf_gpio_softc *sc; 184 int i; 185 186 sc = device_get_softc(dev); 187 for (i = 0; i < sc->gpio_npins; i++) { 188 if (sc->gpio_pins[i].gp_pin == pin) 189 break; 190 } 191 192 if (i >= sc->gpio_npins) 193 return (EINVAL); 194 195 GPIO_LOCK(sc); 196 memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME); 197 GPIO_UNLOCK(sc); 198 199 return (0); 200} 201 202static int 203vf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) 204{ 205 struct vf_gpio_softc *sc; 206 int i; 207 208 sc = device_get_softc(dev); 209 for (i = 0; i < sc->gpio_npins; i++) { 210 if (sc->gpio_pins[i].gp_pin == pin) 211 break; 212 } 213 214 if (i >= sc->gpio_npins) 215 return (EINVAL); 216 217 GPIO_LOCK(sc); 218 *caps = sc->gpio_pins[i].gp_caps; 219 GPIO_UNLOCK(sc); 220 221 return (0); 222} 223 224static int 225vf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) 226{ 227 struct vf_gpio_softc *sc; 228 int i; 229 230 sc = device_get_softc(dev); 231 for (i = 0; i < sc->gpio_npins; i++) { 232 if (sc->gpio_pins[i].gp_pin == pin) 233 break; 234 } 235 236 if (i >= sc->gpio_npins) 237 return (EINVAL); 238 239 GPIO_LOCK(sc); 240 *flags = sc->gpio_pins[i].gp_flags; 241 GPIO_UNLOCK(sc); 242 243 return (0); 244} 245 246static int 247vf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val) 248{ 249 struct vf_gpio_softc *sc; 250 int i; 251 252 sc = device_get_softc(dev); 253 for (i = 0; i < sc->gpio_npins; i++) { 254 if (sc->gpio_pins[i].gp_pin == pin) 255 break; 256 } 257 258 if (i >= sc->gpio_npins) 259 return (EINVAL); 260 261 GPIO_LOCK(sc); 262 *val = (READ4(sc, GPIO_PDIR(i)) & (1 << (i % 32))) ? 1 : 0; 263 GPIO_UNLOCK(sc); 264 265 return (0); 266} 267 268static int 269vf_gpio_pin_toggle(device_t dev, uint32_t pin) 270{ 271 struct vf_gpio_softc *sc; 272 int i; 273 274 sc = device_get_softc(dev); 275 for (i = 0; i < sc->gpio_npins; i++) { 276 if (sc->gpio_pins[i].gp_pin == pin) 277 break; 278 } 279 280 if (i >= sc->gpio_npins) 281 return (EINVAL); 282 283 GPIO_LOCK(sc); 284 WRITE4(sc, GPIO_PTOR(i), (1 << (i % 32))); 285 GPIO_UNLOCK(sc); 286 287 return (0); 288} 289 290 291static void 292vf_gpio_pin_configure(struct vf_gpio_softc *sc, struct gpio_pin *pin, 293 unsigned int flags) 294{ 295 296 GPIO_LOCK(sc); 297 298 /* 299 * Manage input/output 300 */ 301 if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) { 302 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT); 303 if (flags & GPIO_PIN_OUTPUT) { 304 pin->gp_flags |= GPIO_PIN_OUTPUT; 305 306 } else { 307 pin->gp_flags |= GPIO_PIN_INPUT; 308 WRITE4(sc, GPIO_PCOR(pin->gp_pin), 309 (1 << (pin->gp_pin % 32))); 310 } 311 } 312 313 GPIO_UNLOCK(sc); 314} 315 316 317static int 318vf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) 319{ 320 struct vf_gpio_softc *sc; 321 int i; 322 323 sc = device_get_softc(dev); 324 for (i = 0; i < sc->gpio_npins; i++) { 325 if (sc->gpio_pins[i].gp_pin == pin) 326 break; 327 } 328 329 if (i >= sc->gpio_npins) 330 return (EINVAL); 331 332 vf_gpio_pin_configure(sc, &sc->gpio_pins[i], flags); 333 334 return (0); 335} 336 337static int 338vf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value) 339{ 340 struct vf_gpio_softc *sc; 341 int i; 342 343 sc = device_get_softc(dev); 344 for (i = 0; i < sc->gpio_npins; i++) { 345 if (sc->gpio_pins[i].gp_pin == pin) 346 break; 347 } 348 349 if (i >= sc->gpio_npins) 350 return (EINVAL); 351 352 GPIO_LOCK(sc); 353 if (value) 354 WRITE4(sc, GPIO_PSOR(i), (1 << (i % 32))); 355 else 356 WRITE4(sc, GPIO_PCOR(i), (1 << (i % 32))); 357 GPIO_UNLOCK(sc); 358 359 return (0); 360} 361 362static device_method_t vf_gpio_methods[] = { 363 DEVMETHOD(device_probe, vf_gpio_probe), 364 DEVMETHOD(device_attach, vf_gpio_attach), 365 366 /* GPIO protocol */ 367 DEVMETHOD(gpio_get_bus, vf_gpio_get_bus), 368 DEVMETHOD(gpio_pin_max, vf_gpio_pin_max), 369 DEVMETHOD(gpio_pin_getname, vf_gpio_pin_getname), 370 DEVMETHOD(gpio_pin_getcaps, vf_gpio_pin_getcaps), 371 DEVMETHOD(gpio_pin_getflags, vf_gpio_pin_getflags), 372 DEVMETHOD(gpio_pin_get, vf_gpio_pin_get), 373 DEVMETHOD(gpio_pin_toggle, vf_gpio_pin_toggle), 374 DEVMETHOD(gpio_pin_setflags, vf_gpio_pin_setflags), 375 DEVMETHOD(gpio_pin_set, vf_gpio_pin_set), 376 { 0, 0 } 377}; 378 379static driver_t vf_gpio_driver = { 380 "gpio", 381 vf_gpio_methods, 382 sizeof(struct vf_gpio_softc), 383}; 384 385static devclass_t vf_gpio_devclass; 386 387DRIVER_MODULE(vf_gpio, simplebus, vf_gpio_driver, vf_gpio_devclass, 0, 0); 388