454 lines
11 KiB
C
454 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@FreeBSD.org>
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* Copyright (c) 2012-2015 Luiz Otavio O Souza <loos@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/sx.h>
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#include <sys/proc.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/ofw/ofw_bus.h>
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#include <arm/broadcom/bcm2835/bcm2835_firmware.h>
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#include "gpio_if.h"
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#define RPI_FW_GPIO_PINS 8
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#define RPI_FW_GPIO_BASE 128
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#define RPI_FW_GPIO_DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
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struct rpi_fw_gpio_softc {
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device_t sc_busdev;
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device_t sc_firmware;
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struct sx sc_sx;
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struct gpio_pin sc_gpio_pins[RPI_FW_GPIO_PINS];
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uint8_t sc_gpio_state;
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};
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#define RPI_FW_GPIO_LOCK(_sc) sx_xlock(&(_sc)->sc_sx)
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#define RPI_FW_GPIO_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx)
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static struct ofw_compat_data compat_data[] = {
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{"raspberrypi,firmware-gpio", 1},
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{NULL, 0}
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};
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static int
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rpi_fw_gpio_pin_configure(struct rpi_fw_gpio_softc *sc, struct gpio_pin *pin,
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unsigned int flags)
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{
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union msg_get_gpio_config old_cfg;
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union msg_set_gpio_config new_cfg;
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int rv;
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bzero(&old_cfg, sizeof(old_cfg));
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bzero(&new_cfg, sizeof(new_cfg));
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old_cfg.req.gpio = RPI_FW_GPIO_BASE + pin->gp_pin;
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RPI_FW_GPIO_LOCK(sc);
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_GET_GPIO_CONFIG, &old_cfg, sizeof(old_cfg));
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if (rv == 0 && old_cfg.resp.gpio != 0)
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rv = EIO;
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if (rv != 0)
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goto fail;
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new_cfg.req.gpio = RPI_FW_GPIO_BASE + pin->gp_pin;
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if (flags & GPIO_PIN_INPUT) {
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new_cfg.req.dir = BCM2835_FIRMWARE_GPIO_IN;
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new_cfg.req.state = 0;
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pin->gp_flags = GPIO_PIN_INPUT;
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} else if (flags & GPIO_PIN_OUTPUT) {
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new_cfg.req.dir = BCM2835_FIRMWARE_GPIO_OUT;
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if (flags & (GPIO_PIN_PRESET_HIGH | GPIO_PIN_PRESET_LOW)) {
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if (flags & GPIO_PIN_PRESET_HIGH) {
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new_cfg.req.state = 1;
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sc->sc_gpio_state |= (1 << pin->gp_pin);
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} else {
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new_cfg.req.state = 0;
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sc->sc_gpio_state &= ~(1 << pin->gp_pin);
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}
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} else {
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if ((sc->sc_gpio_state & (1 << pin->gp_pin)) != 0) {
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new_cfg.req.state = 1;
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} else {
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new_cfg.req.state = 0;
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}
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}
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pin->gp_flags = GPIO_PIN_OUTPUT;
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} else {
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new_cfg.req.dir = old_cfg.resp.dir;
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/* Use the old state to decide high/low */
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if ((sc->sc_gpio_state & (1 << pin->gp_pin)) != 0)
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new_cfg.req.state = 1;
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else
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new_cfg.req.state = 0;
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}
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new_cfg.req.pol = old_cfg.resp.pol;
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new_cfg.req.term_en = 0;
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new_cfg.req.term_pull_up = 0;
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_SET_GPIO_CONFIG, &new_cfg, sizeof(new_cfg));
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fail:
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RPI_FW_GPIO_UNLOCK(sc);
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return (rv);
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}
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static device_t
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rpi_fw_gpio_get_bus(device_t dev)
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{
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struct rpi_fw_gpio_softc *sc;
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sc = device_get_softc(dev);
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return (sc->sc_busdev);
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}
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static int
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rpi_fw_gpio_pin_max(device_t dev, int *maxpin)
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{
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*maxpin = RPI_FW_GPIO_PINS - 1;
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return (0);
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}
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static int
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rpi_fw_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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struct rpi_fw_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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*caps = RPI_FW_GPIO_DEFAULT_CAPS;
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return (0);
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}
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static int
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rpi_fw_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct rpi_fw_gpio_softc *sc = device_get_softc(dev);
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int i;
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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RPI_FW_GPIO_LOCK(sc);
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*flags = sc->sc_gpio_pins[i].gp_flags;
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RPI_FW_GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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rpi_fw_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct rpi_fw_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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RPI_FW_GPIO_LOCK(sc);
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memcpy(name, sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME);
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RPI_FW_GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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rpi_fw_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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struct rpi_fw_gpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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return (rpi_fw_gpio_pin_configure(sc, &sc->sc_gpio_pins[i], flags));
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}
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static int
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rpi_fw_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct rpi_fw_gpio_softc *sc;
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union msg_set_gpio_state state;
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int i, rv;
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sc = device_get_softc(dev);
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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state.req.gpio = RPI_FW_GPIO_BASE + pin;
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state.req.state = value;
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RPI_FW_GPIO_LOCK(sc);
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_SET_GPIO_STATE, &state, sizeof(state));
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/* The firmware sets gpio to 0 on success */
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if (rv == 0 && state.resp.gpio != 0)
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rv = EINVAL;
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if (rv == 0) {
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sc->sc_gpio_pins[i].gp_flags &= ~(GPIO_PIN_PRESET_HIGH |
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GPIO_PIN_PRESET_LOW);
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if (value)
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sc->sc_gpio_state |= (1 << i);
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else
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sc->sc_gpio_state &= ~(1 << i);
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}
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RPI_FW_GPIO_UNLOCK(sc);
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return (rv);
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}
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static int
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rpi_fw_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
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{
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struct rpi_fw_gpio_softc *sc;
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union msg_get_gpio_state state;
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int i, rv;
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sc = device_get_softc(dev);
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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bzero(&state, sizeof(state));
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state.req.gpio = RPI_FW_GPIO_BASE + pin;
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RPI_FW_GPIO_LOCK(sc);
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_GET_GPIO_STATE, &state, sizeof(state));
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RPI_FW_GPIO_UNLOCK(sc);
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/* The firmware sets gpio to 0 on success */
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if (rv == 0 && state.resp.gpio != 0)
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rv = EINVAL;
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if (rv == 0)
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*val = !state.resp.state;
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return (rv);
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}
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static int
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rpi_fw_gpio_pin_toggle(device_t dev, uint32_t pin)
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{
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struct rpi_fw_gpio_softc *sc;
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union msg_get_gpio_state old_state;
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union msg_set_gpio_state new_state;
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int i, rv;
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sc = device_get_softc(dev);
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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if (sc->sc_gpio_pins[i].gp_pin == pin)
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break;
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}
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if (i >= RPI_FW_GPIO_PINS)
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return (EINVAL);
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bzero(&old_state, sizeof(old_state));
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bzero(&new_state, sizeof(new_state));
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old_state.req.gpio = RPI_FW_GPIO_BASE + pin;
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new_state.req.gpio = RPI_FW_GPIO_BASE + pin;
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RPI_FW_GPIO_LOCK(sc);
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_GET_GPIO_STATE, &old_state, sizeof(old_state));
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/* The firmware sets gpio to 0 on success */
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if (rv == 0 && old_state.resp.gpio == 0) {
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/* Set the new state to invert the GPIO */
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new_state.req.state = !old_state.resp.state;
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_SET_GPIO_STATE, &new_state,
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sizeof(new_state));
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}
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if (rv == 0 && (old_state.resp.gpio != 0 || new_state.resp.gpio != 0))
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rv = EINVAL;
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RPI_FW_GPIO_UNLOCK(sc);
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return (rv);
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}
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static int
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rpi_fw_gpio_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Raspberry Pi Firmware GPIO controller");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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rpi_fw_gpio_attach(device_t dev)
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{
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union msg_get_gpio_config cfg;
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struct rpi_fw_gpio_softc *sc;
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char *names;
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phandle_t gpio;
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int i, nelems, elm_pos, rv;
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sc = device_get_softc(dev);
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sc->sc_firmware = device_get_parent(dev);
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sx_init(&sc->sc_sx, "Raspberry Pi firmware gpio");
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/* Find our node. */
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gpio = ofw_bus_get_node(dev);
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if (!OF_hasprop(gpio, "gpio-controller"))
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/* This is not a GPIO controller. */
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goto fail;
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nelems = OF_getprop_alloc(gpio, "gpio-line-names", (void **)&names);
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if (nelems <= 0)
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names = NULL;
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elm_pos = 0;
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for (i = 0; i < RPI_FW_GPIO_PINS; i++) {
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/* Set the current pin name */
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if (names != NULL && elm_pos < nelems &&
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names[elm_pos] != '\0') {
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snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME,
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"%s", names + elm_pos);
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/* Find the next pin name */
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elm_pos += strlen(names + elm_pos) + 1;
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} else {
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snprintf(sc->sc_gpio_pins[i].gp_name, GPIOMAXNAME,
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"pin %d", i);
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}
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sc->sc_gpio_pins[i].gp_pin = i;
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sc->sc_gpio_pins[i].gp_caps = RPI_FW_GPIO_DEFAULT_CAPS;
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bzero(&cfg, sizeof(cfg));
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cfg.req.gpio = RPI_FW_GPIO_BASE + i;
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rv = bcm2835_firmware_property(sc->sc_firmware,
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BCM2835_FIRMWARE_TAG_GET_GPIO_CONFIG, &cfg, sizeof(cfg));
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if (rv == 0 && cfg.resp.gpio == 0) {
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if (cfg.resp.dir == BCM2835_FIRMWARE_GPIO_IN)
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sc->sc_gpio_pins[i].gp_flags = GPIO_PIN_INPUT;
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else
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sc->sc_gpio_pins[i].gp_flags = GPIO_PIN_OUTPUT;
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} else {
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sc->sc_gpio_pins[i].gp_flags = GPIO_PIN_INPUT;
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}
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}
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free(names, M_OFWPROP);
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sc->sc_busdev = gpiobus_attach_bus(dev);
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if (sc->sc_busdev == NULL)
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goto fail;
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return (0);
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fail:
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sx_destroy(&sc->sc_sx);
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return (ENXIO);
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}
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static int
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rpi_fw_gpio_detach(device_t dev)
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{
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return (EBUSY);
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}
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static device_method_t rpi_fw_gpio_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, rpi_fw_gpio_probe),
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DEVMETHOD(device_attach, rpi_fw_gpio_attach),
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DEVMETHOD(device_detach, rpi_fw_gpio_detach),
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/* GPIO protocol */
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DEVMETHOD(gpio_get_bus, rpi_fw_gpio_get_bus),
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DEVMETHOD(gpio_pin_max, rpi_fw_gpio_pin_max),
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DEVMETHOD(gpio_pin_getname, rpi_fw_gpio_pin_getname),
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DEVMETHOD(gpio_pin_getflags, rpi_fw_gpio_pin_getflags),
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DEVMETHOD(gpio_pin_getcaps, rpi_fw_gpio_pin_getcaps),
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DEVMETHOD(gpio_pin_setflags, rpi_fw_gpio_pin_setflags),
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DEVMETHOD(gpio_pin_get, rpi_fw_gpio_pin_get),
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DEVMETHOD(gpio_pin_set, rpi_fw_gpio_pin_set),
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DEVMETHOD(gpio_pin_toggle, rpi_fw_gpio_pin_toggle),
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DEVMETHOD_END
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};
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static driver_t rpi_fw_gpio_driver = {
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"gpio",
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rpi_fw_gpio_methods,
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sizeof(struct rpi_fw_gpio_softc),
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};
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EARLY_DRIVER_MODULE(rpi_fw_gpio, bcm2835_firmware, rpi_fw_gpio_driver, 0, 0,
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BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
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