vf_gpio.c revision 277996
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: head/sys/arm/freescale/vybrid/vf_gpio.c 277996 2015-01-31 19:32:14Z loos $"); 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/fdt.h> 56#include <machine/cpu.h> 57#include <machine/intr.h> 58 59#include "gpio_if.h" 60 61#include <arm/freescale/vybrid/vf_common.h> 62#include <arm/freescale/vybrid/vf_port.h> 63 64#define GPIO_PDOR(n) (0x00 + 0x40 * (n >> 5)) 65#define GPIO_PSOR(n) (0x04 + 0x40 * (n >> 5)) 66#define GPIO_PCOR(n) (0x08 + 0x40 * (n >> 5)) 67#define GPIO_PTOR(n) (0x0C + 0x40 * (n >> 5)) 68#define GPIO_PDIR(n) (0x10 + 0x40 * (n >> 5)) 69 70#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 71#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 72 73#define DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT) 74 75/* 76 * GPIO interface 77 */ 78static device_t vf_gpio_get_bus(device_t); 79static int vf_gpio_pin_max(device_t, int *); 80static int vf_gpio_pin_getcaps(device_t, uint32_t, uint32_t *); 81static int vf_gpio_pin_getname(device_t, uint32_t, char *); 82static int vf_gpio_pin_getflags(device_t, uint32_t, uint32_t *); 83static int vf_gpio_pin_setflags(device_t, uint32_t, uint32_t); 84static int vf_gpio_pin_set(device_t, uint32_t, unsigned int); 85static int vf_gpio_pin_get(device_t, uint32_t, unsigned int *); 86static int vf_gpio_pin_toggle(device_t, uint32_t pin); 87 88struct vf_gpio_softc { 89 struct resource *res[1]; 90 bus_space_tag_t bst; 91 bus_space_handle_t bsh; 92 93 device_t sc_busdev; 94 struct mtx sc_mtx; 95 int gpio_npins; 96 struct gpio_pin gpio_pins[NGPIO]; 97}; 98 99struct vf_gpio_softc *gpio_sc; 100 101static struct resource_spec vf_gpio_spec[] = { 102 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 103 { -1, 0 } 104}; 105 106static int 107vf_gpio_probe(device_t dev) 108{ 109 110 if (!ofw_bus_status_okay(dev)) 111 return (ENXIO); 112 113 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-gpio")) 114 return (ENXIO); 115 116 device_set_desc(dev, "Vybrid Family GPIO Unit"); 117 return (BUS_PROBE_DEFAULT); 118} 119 120static int 121vf_gpio_attach(device_t dev) 122{ 123 struct vf_gpio_softc *sc; 124 int i; 125 126 sc = device_get_softc(dev); 127 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF); 128 129 if (bus_alloc_resources(dev, vf_gpio_spec, sc->res)) { 130 device_printf(dev, "could not allocate resources\n"); 131 mtx_destroy(&sc->sc_mtx); 132 return (ENXIO); 133 } 134 135 /* Memory interface */ 136 sc->bst = rman_get_bustag(sc->res[0]); 137 sc->bsh = rman_get_bushandle(sc->res[0]); 138 139 gpio_sc = sc; 140 141 sc->gpio_npins = NGPIO; 142 143 for (i = 0; i < sc->gpio_npins; i++) { 144 sc->gpio_pins[i].gp_pin = i; 145 sc->gpio_pins[i].gp_caps = DEFAULT_CAPS; 146 sc->gpio_pins[i].gp_flags = 147 (READ4(sc, GPIO_PDOR(i)) & (1 << (i % 32))) ? 148 GPIO_PIN_OUTPUT: GPIO_PIN_INPUT; 149 snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME, 150 "vf_gpio%d.%d", device_get_unit(dev), i); 151 } 152 153 sc->sc_busdev = gpiobus_attach_bus(dev); 154 if (sc->sc_busdev == NULL) { 155 bus_release_resources(dev, vf_gpio_spec, sc->res); 156 mtx_destroy(&sc->sc_mtx); 157 return (ENXIO); 158 } 159 160 return (0); 161} 162 163static device_t 164vf_gpio_get_bus(device_t dev) 165{ 166 struct vf_gpio_softc *sc; 167 168 sc = device_get_softc(dev); 169 170 return (sc->sc_busdev); 171} 172 173static int 174vf_gpio_pin_max(device_t dev, int *maxpin) 175{ 176 177 *maxpin = NGPIO - 1; 178 return (0); 179} 180 181static int 182vf_gpio_pin_getname(device_t dev, uint32_t pin, char *name) 183{ 184 struct vf_gpio_softc *sc; 185 int i; 186 187 sc = device_get_softc(dev); 188 for (i = 0; i < sc->gpio_npins; i++) { 189 if (sc->gpio_pins[i].gp_pin == pin) 190 break; 191 } 192 193 if (i >= sc->gpio_npins) 194 return (EINVAL); 195 196 GPIO_LOCK(sc); 197 memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME); 198 GPIO_UNLOCK(sc); 199 200 return (0); 201} 202 203static int 204vf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) 205{ 206 struct vf_gpio_softc *sc; 207 int i; 208 209 sc = device_get_softc(dev); 210 for (i = 0; i < sc->gpio_npins; i++) { 211 if (sc->gpio_pins[i].gp_pin == pin) 212 break; 213 } 214 215 if (i >= sc->gpio_npins) 216 return (EINVAL); 217 218 GPIO_LOCK(sc); 219 *caps = sc->gpio_pins[i].gp_caps; 220 GPIO_UNLOCK(sc); 221 222 return (0); 223} 224 225static int 226vf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) 227{ 228 struct vf_gpio_softc *sc; 229 int i; 230 231 sc = device_get_softc(dev); 232 for (i = 0; i < sc->gpio_npins; i++) { 233 if (sc->gpio_pins[i].gp_pin == pin) 234 break; 235 } 236 237 if (i >= sc->gpio_npins) 238 return (EINVAL); 239 240 GPIO_LOCK(sc); 241 *flags = sc->gpio_pins[i].gp_flags; 242 GPIO_UNLOCK(sc); 243 244 return (0); 245} 246 247static int 248vf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val) 249{ 250 struct vf_gpio_softc *sc; 251 int i; 252 253 sc = device_get_softc(dev); 254 for (i = 0; i < sc->gpio_npins; i++) { 255 if (sc->gpio_pins[i].gp_pin == pin) 256 break; 257 } 258 259 if (i >= sc->gpio_npins) 260 return (EINVAL); 261 262 GPIO_LOCK(sc); 263 *val = (READ4(sc, GPIO_PDIR(i)) & (1 << (i % 32))) ? 1 : 0; 264 GPIO_UNLOCK(sc); 265 266 return (0); 267} 268 269static int 270vf_gpio_pin_toggle(device_t dev, uint32_t pin) 271{ 272 struct vf_gpio_softc *sc; 273 int i; 274 275 sc = device_get_softc(dev); 276 for (i = 0; i < sc->gpio_npins; i++) { 277 if (sc->gpio_pins[i].gp_pin == pin) 278 break; 279 } 280 281 if (i >= sc->gpio_npins) 282 return (EINVAL); 283 284 GPIO_LOCK(sc); 285 WRITE4(sc, GPIO_PTOR(i), (1 << (i % 32))); 286 GPIO_UNLOCK(sc); 287 288 return (0); 289} 290 291 292static void 293vf_gpio_pin_configure(struct vf_gpio_softc *sc, struct gpio_pin *pin, 294 unsigned int flags) 295{ 296 297 GPIO_LOCK(sc); 298 299 /* 300 * Manage input/output 301 */ 302 if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) { 303 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT); 304 if (flags & GPIO_PIN_OUTPUT) { 305 pin->gp_flags |= GPIO_PIN_OUTPUT; 306 307 } else { 308 pin->gp_flags |= GPIO_PIN_INPUT; 309 WRITE4(sc, GPIO_PCOR(pin->gp_pin), 310 (1 << (pin->gp_pin % 32))); 311 } 312 } 313 314 GPIO_UNLOCK(sc); 315} 316 317 318static int 319vf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) 320{ 321 struct vf_gpio_softc *sc; 322 int i; 323 324 sc = device_get_softc(dev); 325 for (i = 0; i < sc->gpio_npins; i++) { 326 if (sc->gpio_pins[i].gp_pin == pin) 327 break; 328 } 329 330 if (i >= sc->gpio_npins) 331 return (EINVAL); 332 333 vf_gpio_pin_configure(sc, &sc->gpio_pins[i], flags); 334 335 return (0); 336} 337 338static int 339vf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value) 340{ 341 struct vf_gpio_softc *sc; 342 int i; 343 344 sc = device_get_softc(dev); 345 for (i = 0; i < sc->gpio_npins; i++) { 346 if (sc->gpio_pins[i].gp_pin == pin) 347 break; 348 } 349 350 if (i >= sc->gpio_npins) 351 return (EINVAL); 352 353 GPIO_LOCK(sc); 354 if (value) 355 WRITE4(sc, GPIO_PSOR(i), (1 << (i % 32))); 356 else 357 WRITE4(sc, GPIO_PCOR(i), (1 << (i % 32))); 358 GPIO_UNLOCK(sc); 359 360 return (0); 361} 362 363static device_method_t vf_gpio_methods[] = { 364 DEVMETHOD(device_probe, vf_gpio_probe), 365 DEVMETHOD(device_attach, vf_gpio_attach), 366 367 /* GPIO protocol */ 368 DEVMETHOD(gpio_get_bus, vf_gpio_get_bus), 369 DEVMETHOD(gpio_pin_max, vf_gpio_pin_max), 370 DEVMETHOD(gpio_pin_getname, vf_gpio_pin_getname), 371 DEVMETHOD(gpio_pin_getcaps, vf_gpio_pin_getcaps), 372 DEVMETHOD(gpio_pin_getflags, vf_gpio_pin_getflags), 373 DEVMETHOD(gpio_pin_get, vf_gpio_pin_get), 374 DEVMETHOD(gpio_pin_toggle, vf_gpio_pin_toggle), 375 DEVMETHOD(gpio_pin_setflags, vf_gpio_pin_setflags), 376 DEVMETHOD(gpio_pin_set, vf_gpio_pin_set), 377 { 0, 0 } 378}; 379 380static driver_t vf_gpio_driver = { 381 "gpio", 382 vf_gpio_methods, 383 sizeof(struct vf_gpio_softc), 384}; 385 386static devclass_t vf_gpio_devclass; 387 388DRIVER_MODULE(vf_gpio, simplebus, vf_gpio_driver, vf_gpio_devclass, 0, 0); 389