mirror of
https://git.rtems.org/rtems-libbsd/
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307 lines
7.3 KiB
C
307 lines
7.3 KiB
C
#include <machine/rtems-bsd-kernel-space.h>
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/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
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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 COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <bsp.h>
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#if defined(LIBBSP_ARM_IMX_BSP_H)
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/gpio.h>
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#include <dev/fdt/fdt_common.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 <dev/ofw/ofw_bus_subr.h>
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#include <bsp/imx-gpio.h>
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#define MAXPIN (32)
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#define VALID_PIN(u) ((u) >= 0 && (u) <= MAXPIN)
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struct imx_rtems_gpio_softc {
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device_t dev;
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device_t busdev;
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struct imx_gpio *imx_gpio;
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struct {
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struct imx_gpio_pin pin;
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bool initialized;
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uint32_t flags;
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} pin[MAXPIN];
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};
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static device_t
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imx_rtems_gpio_get_bus(device_t dev)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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return (sc->busdev);
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}
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static int
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imx_rtems_gpio_pin_max(device_t dev, int *maxpin)
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{
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*maxpin = MAXPIN;
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return (0);
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}
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static int
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imx_rtems_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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if (!VALID_PIN(pin))
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return (EINVAL);
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*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
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return (0);
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}
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/* Get a specific pin's name. */
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static int
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imx_rtems_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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if (!VALID_PIN(pin))
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return (EINVAL);
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snprintf(name, GPIOMAXNAME, "%s_%d",
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imx_gpio_get_name(sc->imx_gpio), pin);
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name[GPIOMAXNAME-1] = '\0';
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return (0);
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}
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static void
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imx_rtems_gpio_pin_init(struct imx_rtems_gpio_softc *sc, uint32_t pin)
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{
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imx_gpio_init(&sc->pin[pin].pin);
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sc->pin[pin].initialized = true;
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}
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static int
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imx_rtems_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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if (!VALID_PIN(pin) || value > 1)
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return (EINVAL);
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if (!sc->pin[pin].initialized) {
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imx_rtems_gpio_pin_init(sc, pin);
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}
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imx_gpio_set_output(&sc->pin[pin].pin, value);
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return (0);
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}
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static int
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imx_rtems_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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if (!VALID_PIN(pin))
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return (EINVAL);
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if (!sc->pin[pin].initialized) {
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imx_rtems_gpio_pin_init(sc, pin);
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}
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*value = imx_gpio_get_input(&sc->pin[pin].pin);
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return (0);
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}
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static int
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imx_rtems_gpio_pin_toggle(device_t dev, uint32_t pin)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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if (!VALID_PIN(pin))
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return (EINVAL);
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if (!sc->pin[pin].initialized) {
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imx_rtems_gpio_pin_init(sc, pin);
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}
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imx_gpio_toggle_output(&sc->pin[pin].pin);
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return (0);
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}
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static int
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imx_rtems_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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if (!VALID_PIN(pin))
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return (EINVAL);
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*flags = sc->pin[pin].flags;
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return (0);
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}
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static int
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imx_rtems_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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if (!VALID_PIN(pin))
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return (EINVAL);
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if (flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
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if (flags & GPIO_PIN_PRESET_LOW) {
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imx_gpio_set_output(&sc->pin[pin].pin, 0);
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} else if (flags & GPIO_PIN_PRESET_HIGH) {
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imx_gpio_set_output(&sc->pin[pin].pin, 1);
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}
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if (flags & GPIO_PIN_OUTPUT) {
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sc->pin[pin].pin.mode = IMX_GPIO_MODE_OUTPUT;
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} else {
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sc->pin[pin].pin.mode = IMX_GPIO_MODE_INPUT;
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}
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imx_rtems_gpio_pin_init(sc, pin);
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sc->pin[pin].flags = flags;
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} else {
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return (EINVAL);
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}
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return (0);
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}
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static struct ofw_compat_data compat_data[] = {
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{"fsl,imx35-gpio", 1},
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{"fsl,imx7d-gpio", 1},
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{NULL, 0}
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};
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static int
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imx_rtems_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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device_set_desc(dev, "Freescale i.MX GPIO Controller (RTEMS)");
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return (BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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imx_rtems_gpio_attach(device_t dev)
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{
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struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
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u_long base, size;
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size_t i;
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sc->dev = dev;
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/* Get register address */
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if (fdt_regsize(ofw_bus_get_node(sc->dev), &base, &size) != 0) {
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device_printf(dev, "Can't get register address");
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return (EINVAL);
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}
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sc->imx_gpio = imx_gpio_get_by_register((void *)base);
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if (sc->imx_gpio == NULL) {
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device_printf(dev, "Can't get RTEMS imx_gpio handle");
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return (EINVAL);
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}
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memset(sc->pin, 0, sizeof(sc->pin));
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for (i = 0; i < MAXPIN; ++i) {
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sc->pin[i].pin.gpio = sc->imx_gpio;
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sc->pin[i].pin.mask = 1 << i;
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sc->pin[i].pin.shift = i;
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sc->pin[i].pin.mode = IMX_GPIO_MODE_INPUT;
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}
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/*
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* Do _not_ initialize the pins here. Otherwise we would overwrite prior
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* initializations done by other application parts.
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*/
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sc->busdev = gpiobus_attach_bus(dev);
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if (sc->busdev == NULL) {
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return (ENOMEM);
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}
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return (0);
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}
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static int
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imx_rtems_gpio_detach(device_t dev)
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{
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gpiobus_detach_bus(dev);
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return (0);
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}
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static device_method_t imx_rtems_gpio_methods[] = {
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/* device_if */
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DEVMETHOD(device_probe, imx_rtems_gpio_probe),
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DEVMETHOD(device_attach, imx_rtems_gpio_attach),
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DEVMETHOD(device_detach, imx_rtems_gpio_detach),
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/* GPIO protocol */
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DEVMETHOD(gpio_get_bus, imx_rtems_gpio_get_bus),
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DEVMETHOD(gpio_pin_max, imx_rtems_gpio_pin_max),
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DEVMETHOD(gpio_pin_getname, imx_rtems_gpio_pin_getname),
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DEVMETHOD(gpio_pin_getflags, imx_rtems_gpio_pin_getflags),
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DEVMETHOD(gpio_pin_getcaps, imx_rtems_gpio_pin_getcaps),
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DEVMETHOD(gpio_pin_get, imx_rtems_gpio_pin_get),
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DEVMETHOD(gpio_pin_setflags, imx_rtems_gpio_pin_setflags),
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DEVMETHOD(gpio_pin_set, imx_rtems_gpio_pin_set),
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DEVMETHOD(gpio_pin_toggle, imx_rtems_gpio_pin_toggle),
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DEVMETHOD_END
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};
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static driver_t imx_rtems_gpio_driver = {
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"gpio",
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imx_rtems_gpio_methods,
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sizeof(struct imx_rtems_gpio_softc),
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};
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static devclass_t imx_rtems_gpio_devclass;
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EARLY_DRIVER_MODULE(imx_rtems_gpio, simplebus, imx_rtems_gpio_driver,
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imx_rtems_gpio_devclass, NULL, NULL,
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BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
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#endif /* LIBBSP_ARM_IMX_BSP_H */
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