1 /*- 2 * Copyright (c) 2015, 2019 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 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, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * Synopsys® DesignWare® APB General Purpose Programming I/O 33 * (DW_apb_gpio) peripheral. 34 * 35 * Chapter 22, Cyclone V Device Handbook (CV-5V2 2014.07.22) 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/bus.h> 44 #include <sys/kernel.h> 45 #include <sys/module.h> 46 #include <sys/malloc.h> 47 #include <sys/rman.h> 48 #include <sys/timeet.h> 49 #include <sys/timetc.h> 50 #include <sys/watchdog.h> 51 #include <sys/mutex.h> 52 #include <sys/gpio.h> 53 #include <sys/reboot.h> 54 55 #include <dev/gpio/gpiobusvar.h> 56 #include <dev/ofw/openfirm.h> 57 #include <dev/ofw/ofw_bus.h> 58 #include <dev/ofw/ofw_bus_subr.h> 59 60 #include <machine/bus.h> 61 #include <machine/cpu.h> 62 #include <machine/intr.h> 63 64 #include "gpio_if.h" 65 #include "dwgpio_if.h" 66 67 #define READ4(_sc, _reg) DWGPIO_READ((_sc)->parent, _reg) 68 #define WRITE4(_sc, _reg, _val) DWGPIO_WRITE((_sc)->parent, _reg, _val) 69 70 #define GPIO_SWPORT_DR(n) (0x00 + 0xc * (n)) /* Port n Data Register */ 71 #define GPIO_SWPORT_DDR(n) (0x04 + 0xc * (n)) /* Port n Data Direction */ 72 #define GPIO_INTEN 0x30 /* Interrupt Enable Register */ 73 #define GPIO_INTMASK 0x34 /* Interrupt Mask Register */ 74 #define GPIO_INTTYPE_LEVEL 0x38 /* Interrupt Level Register */ 75 #define GPIO_INT_POLARITY 0x3C /* Interrupt Polarity Register */ 76 #define GPIO_INTSTATUS 0x40 /* Interrupt Status Register */ 77 #define GPIO_RAW_INTSTATUS 0x44 /* Raw Interrupt Status Register */ 78 #define GPIO_DEBOUNCE 0x48 /* Debounce Enable Register */ 79 #define GPIO_PORTA_EOI 0x4C /* Clear Interrupt Register */ 80 #define GPIO_EXT_PORT(n) (0x50 + 0x4 * (n)) /* External Port n */ 81 #define GPIO_LS_SYNC 0x60 /* Synchronization Level Register */ 82 #define GPIO_ID_CODE 0x64 /* ID Code Register */ 83 #define GPIO_VER_ID_CODE 0x6C /* GPIO Version Register */ 84 #define GPIO_CONFIG_REG2 0x70 /* Configuration Register 2 */ 85 #define ENCODED_ID_PWIDTH_M 0x1f /* Width of GPIO Port N Mask */ 86 #define ENCODED_ID_PWIDTH_S(n) (5 * n) /* Width of GPIO Port N Shift */ 87 #define GPIO_CONFIG_REG1 0x74 /* Configuration Register 1 */ 88 89 #define NR_GPIO_MAX 32 /* Maximum pins per port */ 90 91 #define GPIO_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 92 #define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 93 94 #define DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT) 95 96 /* 97 * GPIO interface 98 */ 99 static device_t dwgpio_get_bus(device_t); 100 static int dwgpio_pin_max(device_t, int *); 101 static int dwgpio_pin_getcaps(device_t, uint32_t, uint32_t *); 102 static int dwgpio_pin_getname(device_t, uint32_t, char *); 103 static int dwgpio_pin_getflags(device_t, uint32_t, uint32_t *); 104 static int dwgpio_pin_setflags(device_t, uint32_t, uint32_t); 105 static int dwgpio_pin_set(device_t, uint32_t, unsigned int); 106 static int dwgpio_pin_get(device_t, uint32_t, unsigned int *); 107 static int dwgpio_pin_toggle(device_t, uint32_t pin); 108 109 struct dwgpio_softc { 110 device_t dev; 111 device_t busdev; 112 device_t parent; 113 struct mtx sc_mtx; 114 int gpio_npins; 115 struct gpio_pin gpio_pins[NR_GPIO_MAX]; 116 phandle_t node; 117 int port; 118 }; 119 120 static int 121 dwgpio_probe(device_t dev) 122 { 123 124 if (!ofw_bus_status_okay(dev)) 125 return (ENXIO); 126 127 if (!ofw_bus_is_compatible(dev, "snps,dw-apb-gpio-port")) 128 return (ENXIO); 129 130 device_set_desc(dev, "DesignWare General-Purpose I/O Interface"); 131 return (BUS_PROBE_DEFAULT); 132 } 133 134 static int 135 dwgpio_attach(device_t dev) 136 { 137 struct dwgpio_softc *sc; 138 int version; 139 int nr_pins; 140 int cfg2; 141 int i; 142 143 sc = device_get_softc(dev); 144 sc->parent = device_get_parent(dev); 145 sc->node = ofw_bus_get_node(dev); 146 sc->dev = dev; 147 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF); 148 149 if ((OF_getencprop(sc->node, "reg", &sc->port, sizeof(sc->port))) <= 0) 150 return (ENXIO); 151 152 printf("port %d\n", sc->port); 153 154 version = READ4(sc, GPIO_VER_ID_CODE); 155 if (boothowto & RB_VERBOSE) 156 device_printf(sc->dev, "Version = 0x%08x\n", version); 157 158 /* Grab number of pins from hardware. */ 159 cfg2 = READ4(sc, GPIO_CONFIG_REG2); 160 nr_pins = (cfg2 >> ENCODED_ID_PWIDTH_S(sc->port)) & \ 161 ENCODED_ID_PWIDTH_M; 162 sc->gpio_npins = nr_pins + 1; 163 164 for (i = 0; i < sc->gpio_npins; i++) { 165 sc->gpio_pins[i].gp_pin = i; 166 sc->gpio_pins[i].gp_caps = DEFAULT_CAPS; 167 sc->gpio_pins[i].gp_flags = 168 (READ4(sc, GPIO_SWPORT_DDR(sc->port)) & (1 << i)) ? 169 GPIO_PIN_OUTPUT: GPIO_PIN_INPUT; 170 snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME, 171 "dwgpio%d.%d", device_get_unit(dev), i); 172 } 173 sc->busdev = gpiobus_attach_bus(dev); 174 if (sc->busdev == NULL) { 175 mtx_destroy(&sc->sc_mtx); 176 return (ENXIO); 177 } 178 179 return (0); 180 } 181 182 static device_t 183 dwgpio_get_bus(device_t dev) 184 { 185 struct dwgpio_softc *sc; 186 187 sc = device_get_softc(dev); 188 189 return (sc->busdev); 190 } 191 192 static int 193 dwgpio_pin_max(device_t dev, int *maxpin) 194 { 195 struct dwgpio_softc *sc; 196 197 sc = device_get_softc(dev); 198 199 *maxpin = sc->gpio_npins - 1; 200 201 return (0); 202 } 203 204 static int 205 dwgpio_pin_getname(device_t dev, uint32_t pin, char *name) 206 { 207 struct dwgpio_softc *sc; 208 int i; 209 210 sc = device_get_softc(dev); 211 for (i = 0; i < sc->gpio_npins; i++) { 212 if (sc->gpio_pins[i].gp_pin == pin) 213 break; 214 } 215 216 if (i >= sc->gpio_npins) 217 return (EINVAL); 218 219 GPIO_LOCK(sc); 220 memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME); 221 GPIO_UNLOCK(sc); 222 223 return (0); 224 } 225 226 static int 227 dwgpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps) 228 { 229 struct dwgpio_softc *sc; 230 int i; 231 232 sc = device_get_softc(dev); 233 for (i = 0; i < sc->gpio_npins; i++) { 234 if (sc->gpio_pins[i].gp_pin == pin) 235 break; 236 } 237 238 if (i >= sc->gpio_npins) 239 return (EINVAL); 240 241 GPIO_LOCK(sc); 242 *caps = sc->gpio_pins[i].gp_caps; 243 GPIO_UNLOCK(sc); 244 245 return (0); 246 } 247 248 static int 249 dwgpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags) 250 { 251 struct dwgpio_softc *sc; 252 int i; 253 254 sc = device_get_softc(dev); 255 for (i = 0; i < sc->gpio_npins; i++) { 256 if (sc->gpio_pins[i].gp_pin == pin) 257 break; 258 } 259 260 if (i >= sc->gpio_npins) 261 return (EINVAL); 262 263 GPIO_LOCK(sc); 264 *flags = sc->gpio_pins[i].gp_flags; 265 GPIO_UNLOCK(sc); 266 267 return (0); 268 } 269 270 static int 271 dwgpio_pin_get(device_t dev, uint32_t pin, unsigned int *val) 272 { 273 struct dwgpio_softc *sc; 274 int i; 275 276 sc = device_get_softc(dev); 277 for (i = 0; i < sc->gpio_npins; i++) { 278 if (sc->gpio_pins[i].gp_pin == pin) 279 break; 280 } 281 282 if (i >= sc->gpio_npins) 283 return (EINVAL); 284 285 GPIO_LOCK(sc); 286 *val = (READ4(sc, GPIO_EXT_PORT(sc->port)) & (1 << i)) ? 1 : 0; 287 GPIO_UNLOCK(sc); 288 289 return (0); 290 } 291 292 static int 293 dwgpio_pin_toggle(device_t dev, uint32_t pin) 294 { 295 struct dwgpio_softc *sc; 296 int reg; 297 int i; 298 299 sc = device_get_softc(dev); 300 for (i = 0; i < sc->gpio_npins; i++) { 301 if (sc->gpio_pins[i].gp_pin == pin) 302 break; 303 } 304 305 if (i >= sc->gpio_npins) 306 return (EINVAL); 307 308 GPIO_LOCK(sc); 309 reg = READ4(sc, GPIO_SWPORT_DR(sc->port)); 310 if (reg & (1 << i)) 311 reg &= ~(1 << i); 312 else 313 reg |= (1 << i); 314 WRITE4(sc, GPIO_SWPORT_DR(sc->port), reg); 315 GPIO_UNLOCK(sc); 316 317 return (0); 318 } 319 320 321 static void 322 dwgpio_pin_configure(struct dwgpio_softc *sc, 323 struct gpio_pin *pin, unsigned int flags) 324 { 325 int reg; 326 327 GPIO_LOCK(sc); 328 329 /* 330 * Manage input/output 331 */ 332 333 reg = READ4(sc, GPIO_SWPORT_DDR(sc->port)); 334 if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) { 335 pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT); 336 if (flags & GPIO_PIN_OUTPUT) { 337 pin->gp_flags |= GPIO_PIN_OUTPUT; 338 reg |= (1 << pin->gp_pin); 339 } else { 340 pin->gp_flags |= GPIO_PIN_INPUT; 341 reg &= ~(1 << pin->gp_pin); 342 } 343 } 344 345 WRITE4(sc, GPIO_SWPORT_DDR(sc->port), reg); 346 GPIO_UNLOCK(sc); 347 } 348 349 350 static int 351 dwgpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags) 352 { 353 struct dwgpio_softc *sc; 354 int i; 355 356 sc = device_get_softc(dev); 357 for (i = 0; i < sc->gpio_npins; i++) { 358 if (sc->gpio_pins[i].gp_pin == pin) 359 break; 360 } 361 362 if (i >= sc->gpio_npins) 363 return (EINVAL); 364 365 dwgpio_pin_configure(sc, &sc->gpio_pins[i], flags); 366 367 return (0); 368 } 369 370 static int 371 dwgpio_pin_set(device_t dev, uint32_t pin, unsigned int value) 372 { 373 struct dwgpio_softc *sc; 374 int reg; 375 int i; 376 377 sc = device_get_softc(dev); 378 379 for (i = 0; i < sc->gpio_npins; i++) { 380 if (sc->gpio_pins[i].gp_pin == pin) 381 break; 382 } 383 384 if (i >= sc->gpio_npins) 385 return (EINVAL); 386 387 GPIO_LOCK(sc); 388 reg = READ4(sc, GPIO_SWPORT_DR(sc->port)); 389 if (value) 390 reg |= (1 << i); 391 else 392 reg &= ~(1 << i); 393 WRITE4(sc, GPIO_SWPORT_DR(sc->port), reg); 394 GPIO_UNLOCK(sc); 395 396 return (0); 397 } 398 399 static device_method_t dwgpio_methods[] = { 400 DEVMETHOD(device_probe, dwgpio_probe), 401 DEVMETHOD(device_attach, dwgpio_attach), 402 403 /* GPIO protocol */ 404 DEVMETHOD(gpio_get_bus, dwgpio_get_bus), 405 DEVMETHOD(gpio_pin_max, dwgpio_pin_max), 406 DEVMETHOD(gpio_pin_getname, dwgpio_pin_getname), 407 DEVMETHOD(gpio_pin_getcaps, dwgpio_pin_getcaps), 408 DEVMETHOD(gpio_pin_getflags, dwgpio_pin_getflags), 409 DEVMETHOD(gpio_pin_get, dwgpio_pin_get), 410 DEVMETHOD(gpio_pin_toggle, dwgpio_pin_toggle), 411 DEVMETHOD(gpio_pin_setflags, dwgpio_pin_setflags), 412 DEVMETHOD(gpio_pin_set, dwgpio_pin_set), 413 { 0, 0 } 414 }; 415 416 static driver_t dwgpio_driver = { 417 "gpio", 418 dwgpio_methods, 419 sizeof(struct dwgpio_softc), 420 }; 421 422 DRIVER_MODULE(dwgpio, dwgpiobus, dwgpio_driver, 0, 0); 423