1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
5  * Copyright (c) 2012-2015 Luiz Otavio O Souza <loos@FreeBSD.org>
36 #include <sys/gpio.h>
43 #include <dev/gpio/gpiobusvar.h>
62 #define	RPI_FW_GPIO_LOCK(_sc)	sx_xlock(&(_sc)->sc_sx)
63 #define	RPI_FW_GPIO_UNLOCK(_sc)	sx_xunlock(&(_sc)->sc_sx)
66 	{"raspberrypi,firmware-gpio",	1},
80 	old_cfg.req.gpio = RPI_FW_GPIO_BASE + pin->gp_pin;  in rpi_fw_gpio_pin_configure()
83 	rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_pin_configure()
85 	if (rv == 0 && old_cfg.resp.gpio != 0)  in rpi_fw_gpio_pin_configure()
90 	new_cfg.req.gpio = RPI_FW_GPIO_BASE + pin->gp_pin;  in rpi_fw_gpio_pin_configure()
94 		pin->gp_flags = GPIO_PIN_INPUT;  in rpi_fw_gpio_pin_configure()
100 				sc->sc_gpio_state |= (1 << pin->gp_pin);  in rpi_fw_gpio_pin_configure()
103 				sc->sc_gpio_state &= ~(1 << pin->gp_pin);  in rpi_fw_gpio_pin_configure()
106 			if ((sc->sc_gpio_state & (1 << pin->gp_pin)) != 0) {  in rpi_fw_gpio_pin_configure()
112 		pin->gp_flags = GPIO_PIN_OUTPUT;  in rpi_fw_gpio_pin_configure()
116 		if ((sc->sc_gpio_state & (1 << pin->gp_pin)) != 0)  in rpi_fw_gpio_pin_configure()
125 	rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_pin_configure()
141 	return (sc->sc_busdev);  in rpi_fw_gpio_get_bus()
148 	*maxpin = RPI_FW_GPIO_PINS - 1;  in rpi_fw_gpio_pin_max()
160 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_getcaps()
178 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_getflags()
186 	*flags = sc->sc_gpio_pins[i].gp_flags;  in rpi_fw_gpio_pin_getflags()
200 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_getname()
208 	memcpy(name, sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME);  in rpi_fw_gpio_pin_getname()
222 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_setflags()
229 	return (rpi_fw_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags));  in rpi_fw_gpio_pin_setflags()
241 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_set()
247 	state.req.gpio = RPI_FW_GPIO_BASE + pin;  in rpi_fw_gpio_pin_set()
251 	rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_pin_set()
253 	/* The firmware sets gpio to 0 on success */  in rpi_fw_gpio_pin_set()
254 	if (rv == 0 && state.resp.gpio != 0)  in rpi_fw_gpio_pin_set()
257 		sc->sc_gpio_pins[i].gp_flags &= ~(GPIO_PIN_PRESET_HIGH |  in rpi_fw_gpio_pin_set()
260 			sc->sc_gpio_state |= (1 << i);  in rpi_fw_gpio_pin_set()
262 			sc->sc_gpio_state &= ~(1 << i);  in rpi_fw_gpio_pin_set()
278 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_get()
285 	state.req.gpio = RPI_FW_GPIO_BASE + pin;  in rpi_fw_gpio_pin_get()
288 	rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_pin_get()
292 	/* The firmware sets gpio to 0 on success */  in rpi_fw_gpio_pin_get()
293 	if (rv == 0 && state.resp.gpio != 0)  in rpi_fw_gpio_pin_get()
311 		if (sc->sc_gpio_pins[i].gp_pin == pin)  in rpi_fw_gpio_pin_toggle()
320 	old_state.req.gpio = RPI_FW_GPIO_BASE + pin;  in rpi_fw_gpio_pin_toggle()
321 	new_state.req.gpio = RPI_FW_GPIO_BASE + pin;  in rpi_fw_gpio_pin_toggle()
324 	rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_pin_toggle()
326 	/* The firmware sets gpio to 0 on success */  in rpi_fw_gpio_pin_toggle()
327 	if (rv == 0 && old_state.resp.gpio == 0) {  in rpi_fw_gpio_pin_toggle()
328 		/* Set the new state to invert the GPIO */  in rpi_fw_gpio_pin_toggle()
330 		rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_pin_toggle()
334 	if (rv == 0 && (old_state.resp.gpio != 0 || new_state.resp.gpio != 0))  in rpi_fw_gpio_pin_toggle()
348 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)  in rpi_fw_gpio_probe()
351 	device_set_desc(dev, "Raspberry Pi Firmware GPIO controller");  in rpi_fw_gpio_probe()
358 	union msg_get_gpio_config cfg;  in rpi_fw_gpio_attach()  local
361 	phandle_t gpio;  in rpi_fw_gpio_attach()  local
365 	sc->sc_firmware = device_get_parent(dev);  in rpi_fw_gpio_attach()
366 	sx_init(&sc->sc_sx, "Raspberry Pi firmware gpio");  in rpi_fw_gpio_attach()
368 	gpio = ofw_bus_get_node(dev);  in rpi_fw_gpio_attach()
369 	if (!OF_hasprop(gpio, "gpio-controller"))  in rpi_fw_gpio_attach()
370 		/* This is not a GPIO controller. */  in rpi_fw_gpio_attach()
373 	nelems = OF_getprop_alloc(gpio, "gpio-line-names", (void **)&names);  in rpi_fw_gpio_attach()
381 			snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME,  in rpi_fw_gpio_attach()
386 			snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME,  in rpi_fw_gpio_attach()
390 		sc->sc_gpio_pins[i].gp_pin = i;  in rpi_fw_gpio_attach()
391 		sc->sc_gpio_pins[i].gp_caps = RPI_FW_GPIO_DEFAULT_CAPS;  in rpi_fw_gpio_attach()
393 		bzero(&cfg, sizeof(cfg));  in rpi_fw_gpio_attach()
394 		cfg.req.gpio = RPI_FW_GPIO_BASE + i;  in rpi_fw_gpio_attach()
395 		rv = bcm2835_firmware_property(sc->sc_firmware,  in rpi_fw_gpio_attach()
396 		    BCM2835_FIRMWARE_TAG_GET_GPIO_CONFIG, &cfg, sizeof(cfg));  in rpi_fw_gpio_attach()
397 		if (rv == 0 && cfg.resp.gpio == 0) {  in rpi_fw_gpio_attach()
398 			if (cfg.resp.dir == BCM2835_FIRMWARE_GPIO_IN)  in rpi_fw_gpio_attach()
399 				sc->sc_gpio_pins[i].gp_flags = GPIO_PIN_INPUT;  in rpi_fw_gpio_attach()
401 				sc->sc_gpio_pins[i].gp_flags = GPIO_PIN_OUTPUT;  in rpi_fw_gpio_attach()
403 			sc->sc_gpio_pins[i].gp_flags = GPIO_PIN_INPUT;  in rpi_fw_gpio_attach()
407 	sc->sc_busdev = gpiobus_attach_bus(dev);  in rpi_fw_gpio_attach()
408 	if (sc->sc_busdev == NULL)  in rpi_fw_gpio_attach()
414 	sx_destroy(&sc->sc_sx);  in rpi_fw_gpio_attach()
432 	/* GPIO protocol */
447 	"gpio",