1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Thomas Skibo 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 * $FreeBSD$ 29 */ 30 31 /* 32 * A GPIO driver for Xilinx Zynq-7000. 33 * 34 * The GPIO peripheral on Zynq allows controlling 114 general purpose I/Os. 35 * 36 * Pins 53-0 are sent to the MIO. Any MIO pins not used by a PS peripheral are 37 * available as a GPIO pin. Pins 64-127 are sent to the PL (FPGA) section of 38 * Zynq as EMIO signals. 39 * 40 * The hardware provides a way to use IOs as interrupt sources but the 41 * gpio framework doesn't seem to have hooks for this. 42 * 43 * Reference: Zynq-7000 All Programmable SoC Technical Reference Manual. 44 * (v1.4) November 16, 2012. Xilinx doc UG585. GPIO is covered in 45 * chater 14. Register definitions are in appendix B.19. 46 */ 47 48 #include <sys/cdefs.h> 49 __FBSDID("$FreeBSD$"); 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/conf.h> 54 #include <sys/bus.h> 55 #include <sys/kernel.h> 56 #include <sys/module.h> 57 #include <sys/lock.h> 58 #include <sys/mutex.h> 59 #include <sys/resource.h> 60 #include <sys/rman.h> 61 #include <sys/gpio.h> 62 63 #include <machine/bus.h> 64 #include <machine/resource.h> 65 #include <machine/stdarg.h> 66 67 #include <dev/gpio/gpiobusvar.h> 68 #include <dev/ofw/ofw_bus.h> 69 #include <dev/ofw/ofw_bus_subr.h> 70 71 #include "gpio_if.h" 72 73 #define NUMBANKS 4 74 #define MAXPIN (32*NUMBANKS) 75 76 #define MIO_PIN 0 /* pins 0-53 go to MIO */ 77 #define NUM_MIO_PINS 54 78 #define EMIO_PIN 64 /* pins 64-127 go to PL */ 79 #define NUM_EMIO_PINS 64 80 81 #define VALID_PIN(u) (((u) >= MIO_PIN && (u) < MIO_PIN + NUM_MIO_PINS) || \ 82 ((u) >= EMIO_PIN && (u) < EMIO_PIN + NUM_EMIO_PINS)) 83 84 #define ZGPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx) 85 #define ZGPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx) 86 #define ZGPIO_LOCK_INIT(sc) \ 87 mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \ 88 "gpio", MTX_DEF) 89 #define ZGPIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 90 91 struct zy7_gpio_softc { 92 device_t dev; 93 device_t busdev; 94 struct mtx sc_mtx; 95 struct resource *mem_res; /* Memory resource */ 96 }; 97 98 #define WR4(sc, off, val) bus_write_4((sc)->mem_res, (off), (val)) 99 #define RD4(sc, off) bus_read_4((sc)->mem_res, (off)) 100 101 /* Xilinx Zynq-7000 GPIO register definitions: 102 */ 103 #define ZY7_GPIO_MASK_DATA_LSW(b) (0x0000+8*(b)) /* maskable wr lo */ 104 #define ZY7_GPIO_MASK_DATA_MSW(b) (0x0004+8*(b)) /* maskable wr hi */ 105 #define ZY7_GPIO_DATA(b) (0x0040+4*(b)) /* in/out data */ 106 #define ZY7_GPIO_DATA_RO(b) (0x0060+4*(b)) /* input data */ 107 108 #define ZY7_GPIO_DIRM(b) (0x0204+0x40*(b)) /* direction mode */ 109 #define ZY7_GPIO_OEN(b) (0x0208+0x40*(b)) /* output enable */ 110 #define ZY7_GPIO_INT_MASK(b) (0x020c+0x40*(b)) /* int mask */ 111 #define ZY7_GPIO_INT_EN(b) (0x0210+0x40*(b)) /* int enable */ 112 #define ZY7_GPIO_INT_DIS(b) (0x0214+0x40*(b)) /* int disable */ 113 #define ZY7_GPIO_INT_STAT(b) (0x0218+0x40*(b)) /* int status */ 114 #define ZY7_GPIO_INT_TYPE(b) (0x021c+0x40*(b)) /* int type */ 115 #define ZY7_GPIO_INT_POLARITY(b) (0x0220+0x40*(b)) /* int polarity */ 116 #define ZY7_GPIO_INT_ANY(b) (0x0224+0x40*(b)) /* any edge */ 117 118 static device_t 119 zy7_gpio_get_bus(device_t dev) 120 { 121 struct zy7_gpio_softc *sc; 122 123 sc = device_get_softc(dev); 124 125 return (sc->busdev); 126 } 127 128 static int 129 zy7_gpio_pin_max(device_t dev, int *maxpin) 130 { 131 132 *maxpin = MAXPIN; 133 return (0); 134 } 135 136 /* Get a specific pin's capabilities. */ 137 static int 138 zy7_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) 139 { 140 141 if (!VALID_PIN(pin)) 142 return (EINVAL); 143 144 *caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); 145 146 return (0); 147 } 148 149 /* Get a specific pin's name. */ 150 static int 151 zy7_gpio_pin_getname(device_t dev, uint32_t pin, char *name) 152 { 153 154 if (!VALID_PIN(pin)) 155 return (EINVAL); 156 157 if (pin < NUM_MIO_PINS) { 158 snprintf(name, GPIOMAXNAME, "MIO_%d", pin); 159 name[GPIOMAXNAME - 1] = '\0'; 160 } else { 161 snprintf(name, GPIOMAXNAME, "EMIO_%d", pin - EMIO_PIN); 162 name[GPIOMAXNAME - 1] = '\0'; 163 } 164 165 return (0); 166 } 167 168 /* Get a specific pin's current in/out/tri state. */ 169 static int 170 zy7_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) 171 { 172 struct zy7_gpio_softc *sc = device_get_softc(dev); 173 174 if (!VALID_PIN(pin)) 175 return (EINVAL); 176 177 ZGPIO_LOCK(sc); 178 179 if ((RD4(sc, ZY7_GPIO_DIRM(pin >> 5)) & (1 << (pin & 31))) != 0) { 180 /* output */ 181 if ((RD4(sc, ZY7_GPIO_OEN(pin >> 5)) & (1 << (pin & 31))) == 0) 182 *flags = (GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); 183 else 184 *flags = GPIO_PIN_OUTPUT; 185 } else 186 /* input */ 187 *flags = GPIO_PIN_INPUT; 188 189 ZGPIO_UNLOCK(sc); 190 191 return (0); 192 } 193 194 /* Set a specific pin's in/out/tri state. */ 195 static int 196 zy7_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) 197 { 198 struct zy7_gpio_softc *sc = device_get_softc(dev); 199 200 if (!VALID_PIN(pin)) 201 return (EINVAL); 202 203 ZGPIO_LOCK(sc); 204 205 if ((flags & GPIO_PIN_OUTPUT) != 0) { 206 /* Output. Set or reset OEN too. */ 207 WR4(sc, ZY7_GPIO_DIRM(pin >> 5), 208 RD4(sc, ZY7_GPIO_DIRM(pin >> 5)) | (1 << (pin & 31))); 209 210 if ((flags & GPIO_PIN_TRISTATE) != 0) 211 WR4(sc, ZY7_GPIO_OEN(pin >> 5), 212 RD4(sc, ZY7_GPIO_OEN(pin >> 5)) & 213 ~(1 << (pin & 31))); 214 else 215 WR4(sc, ZY7_GPIO_OEN(pin >> 5), 216 RD4(sc, ZY7_GPIO_OEN(pin >> 5)) | 217 (1 << (pin & 31))); 218 } else { 219 /* Input. Turn off OEN. */ 220 WR4(sc, ZY7_GPIO_DIRM(pin >> 5), 221 RD4(sc, ZY7_GPIO_DIRM(pin >> 5)) & ~(1 << (pin & 31))); 222 WR4(sc, ZY7_GPIO_OEN(pin >> 5), 223 RD4(sc, ZY7_GPIO_OEN(pin >> 5)) & ~(1 << (pin & 31))); 224 } 225 226 ZGPIO_UNLOCK(sc); 227 228 return (0); 229 } 230 231 /* Set a specific output pin's value. */ 232 static int 233 zy7_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value) 234 { 235 struct zy7_gpio_softc *sc = device_get_softc(dev); 236 237 if (!VALID_PIN(pin) || value > 1) 238 return (EINVAL); 239 240 /* Fancy register tricks allow atomic set or reset. */ 241 if ((pin & 16) != 0) 242 WR4(sc, ZY7_GPIO_MASK_DATA_MSW(pin >> 5), 243 (0xffff0000 ^ (0x10000 << (pin & 15))) | 244 (value << (pin & 15))); 245 else 246 WR4(sc, ZY7_GPIO_MASK_DATA_LSW(pin >> 5), 247 (0xffff0000 ^ (0x10000 << (pin & 15))) | 248 (value << (pin & 15))); 249 250 return (0); 251 } 252 253 /* Get a specific pin's input value. */ 254 static int 255 zy7_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value) 256 { 257 struct zy7_gpio_softc *sc = device_get_softc(dev); 258 259 if (!VALID_PIN(pin)) 260 return (EINVAL); 261 262 *value = (RD4(sc, ZY7_GPIO_DATA_RO(pin >> 5)) >> (pin & 31)) & 1; 263 264 return (0); 265 } 266 267 /* Toggle a pin's output value. */ 268 static int 269 zy7_gpio_pin_toggle(device_t dev, uint32_t pin) 270 { 271 struct zy7_gpio_softc *sc = device_get_softc(dev); 272 273 if (!VALID_PIN(pin)) 274 return (EINVAL); 275 276 ZGPIO_LOCK(sc); 277 278 WR4(sc, ZY7_GPIO_DATA(pin >> 5), 279 RD4(sc, ZY7_GPIO_DATA(pin >> 5)) ^ (1 << (pin & 31))); 280 281 ZGPIO_UNLOCK(sc); 282 283 return (0); 284 } 285 286 static int 287 zy7_gpio_probe(device_t dev) 288 { 289 290 if (!ofw_bus_status_okay(dev)) 291 return (ENXIO); 292 293 if (!ofw_bus_is_compatible(dev, "xlnx,zy7_gpio")) 294 return (ENXIO); 295 296 device_set_desc(dev, "Zynq-7000 GPIO driver"); 297 return (0); 298 } 299 300 static int zy7_gpio_detach(device_t dev); 301 302 static int 303 zy7_gpio_attach(device_t dev) 304 { 305 struct zy7_gpio_softc *sc = device_get_softc(dev); 306 int rid; 307 308 sc->dev = dev; 309 310 ZGPIO_LOCK_INIT(sc); 311 312 /* Allocate memory. */ 313 rid = 0; 314 sc->mem_res = bus_alloc_resource_any(dev, 315 SYS_RES_MEMORY, &rid, RF_ACTIVE); 316 if (sc->mem_res == NULL) { 317 device_printf(dev, "Can't allocate memory for device"); 318 zy7_gpio_detach(dev); 319 return (ENOMEM); 320 } 321 322 sc->busdev = gpiobus_attach_bus(dev); 323 if (sc->busdev == NULL) { 324 zy7_gpio_detach(dev); 325 return (ENOMEM); 326 } 327 328 return (0); 329 } 330 331 static int 332 zy7_gpio_detach(device_t dev) 333 { 334 struct zy7_gpio_softc *sc = device_get_softc(dev); 335 336 gpiobus_detach_bus(dev); 337 338 if (sc->mem_res != NULL) { 339 /* Release memory resource. */ 340 bus_release_resource(dev, SYS_RES_MEMORY, 341 rman_get_rid(sc->mem_res), sc->mem_res); 342 } 343 344 ZGPIO_LOCK_DESTROY(sc); 345 346 return (0); 347 } 348 349 static device_method_t zy7_gpio_methods[] = { 350 /* device_if */ 351 DEVMETHOD(device_probe, zy7_gpio_probe), 352 DEVMETHOD(device_attach, zy7_gpio_attach), 353 DEVMETHOD(device_detach, zy7_gpio_detach), 354 355 /* GPIO protocol */ 356 DEVMETHOD(gpio_get_bus, zy7_gpio_get_bus), 357 DEVMETHOD(gpio_pin_max, zy7_gpio_pin_max), 358 DEVMETHOD(gpio_pin_getname, zy7_gpio_pin_getname), 359 DEVMETHOD(gpio_pin_getflags, zy7_gpio_pin_getflags), 360 DEVMETHOD(gpio_pin_getcaps, zy7_gpio_pin_getcaps), 361 DEVMETHOD(gpio_pin_setflags, zy7_gpio_pin_setflags), 362 DEVMETHOD(gpio_pin_get, zy7_gpio_pin_get), 363 DEVMETHOD(gpio_pin_set, zy7_gpio_pin_set), 364 DEVMETHOD(gpio_pin_toggle, zy7_gpio_pin_toggle), 365 366 DEVMETHOD_END 367 }; 368 369 static driver_t zy7_gpio_driver = { 370 "gpio", 371 zy7_gpio_methods, 372 sizeof(struct zy7_gpio_softc), 373 }; 374 375 DRIVER_MODULE(zy7_gpio, simplebus, zy7_gpio_driver, NULL, NULL); 376