#include <machine/rtems-bsd-kernel-space.h>
/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp.h>
#if defined(LIBBSP_ARM_IMX_BSP_H)
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/gpio.h>
#include <dev/fdt/fdt_common.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <bsp/imx-gpio.h>
#define MAXPIN (32)
#define VALID_PIN(u) ((u) >= 0 && (u) <= MAXPIN)
struct imx_rtems_gpio_softc {
device_t dev;
device_t busdev;
struct imx_gpio *imx_gpio;
struct {
struct imx_gpio_pin pin;
bool initialized;
uint32_t flags;
} pin[MAXPIN];
};
static device_t
imx_rtems_gpio_get_bus(device_t dev)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
return (sc->busdev);
}
static int
imx_rtems_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = MAXPIN;
return (0);
}
static int
imx_rtems_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
if (!VALID_PIN(pin))
return (EINVAL);
*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
return (0);
}
/* Get a specific pin's name. */
static int
imx_rtems_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
snprintf(name, GPIOMAXNAME, "%s_%d",
imx_gpio_get_name(sc->imx_gpio), pin);
name[GPIOMAXNAME-1] = '\0';
return (0);
}
static void
imx_rtems_gpio_pin_init(struct imx_rtems_gpio_softc *sc, uint32_t pin)
{
imx_gpio_init(&sc->pin[pin].pin);
sc->pin[pin].initialized = true;
}
static int
imx_rtems_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin) || value > 1)
return (EINVAL);
if (!sc->pin[pin].initialized) {
imx_rtems_gpio_pin_init(sc, pin);
}
imx_gpio_set_output(&sc->pin[pin].pin, value);
return (0);
}
static int
imx_rtems_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
if (!sc->pin[pin].initialized) {
imx_rtems_gpio_pin_init(sc, pin);
}
*value = imx_gpio_get_input(&sc->pin[pin].pin);
return (0);
}
static int
imx_rtems_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
if (!sc->pin[pin].initialized) {
imx_rtems_gpio_pin_init(sc, pin);
}
imx_gpio_toggle_output(&sc->pin[pin].pin);
return (0);
}
static int
imx_rtems_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
*flags = sc->pin[pin].flags;
return (0);
}
static int
imx_rtems_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
if (flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) {
if (flags & GPIO_PIN_PRESET_LOW) {
imx_gpio_set_output(&sc->pin[pin].pin, 0);
} else if (flags & GPIO_PIN_PRESET_HIGH) {
imx_gpio_set_output(&sc->pin[pin].pin, 1);
}
if (flags & GPIO_PIN_OUTPUT) {
sc->pin[pin].pin.mode = IMX_GPIO_MODE_OUTPUT;
} else {
sc->pin[pin].pin.mode = IMX_GPIO_MODE_INPUT;
}
imx_rtems_gpio_pin_init(sc, pin);
sc->pin[pin].flags = flags;
} else {
return (EINVAL);
}
return (0);
}
static struct ofw_compat_data compat_data[] = {
{"fsl,imx35-gpio", 1},
{"fsl,imx7d-gpio", 1},
{NULL, 0}
};
static int
imx_rtems_gpio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
device_set_desc(dev, "Freescale i.MX GPIO Controller (RTEMS)");
return (BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
imx_rtems_gpio_attach(device_t dev)
{
struct imx_rtems_gpio_softc *sc = device_get_softc(dev);
u_long base, size;
size_t i;
sc->dev = dev;
/* Get register address */
if (fdt_regsize(ofw_bus_get_node(sc->dev), &base, &size) != 0) {
device_printf(dev, "Can't get register address");
return (EINVAL);
}
sc->imx_gpio = imx_gpio_get_by_register((void *)base);
if (sc->imx_gpio == NULL) {
device_printf(dev, "Can't get RTEMS imx_gpio handle");
return (EINVAL);
}
memset(sc->pin, 0, sizeof(sc->pin));
for (i = 0; i < MAXPIN; ++i) {
sc->pin[i].pin.gpio = sc->imx_gpio;
sc->pin[i].pin.mask = 1 << i;
sc->pin[i].pin.shift = i;
sc->pin[i].pin.mode = IMX_GPIO_MODE_INPUT;
}
/*
* Do _not_ initialize the pins here. Otherwise we would overwrite prior
* initializations done by other application parts.
*/
sc->busdev = gpiobus_attach_bus(dev);
if (sc->busdev == NULL) {
return (ENOMEM);
}
return (0);
}
static int
imx_rtems_gpio_detach(device_t dev)
{
gpiobus_detach_bus(dev);
return (0);
}
static device_method_t imx_rtems_gpio_methods[] = {
/* device_if */
DEVMETHOD(device_probe, imx_rtems_gpio_probe),
DEVMETHOD(device_attach, imx_rtems_gpio_attach),
DEVMETHOD(device_detach, imx_rtems_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, imx_rtems_gpio_get_bus),
DEVMETHOD(gpio_pin_max, imx_rtems_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, imx_rtems_gpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, imx_rtems_gpio_pin_getflags),
DEVMETHOD(gpio_pin_getcaps, imx_rtems_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_get, imx_rtems_gpio_pin_get),
DEVMETHOD(gpio_pin_setflags, imx_rtems_gpio_pin_setflags),
DEVMETHOD(gpio_pin_set, imx_rtems_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, imx_rtems_gpio_pin_toggle),
DEVMETHOD_END
};
static driver_t imx_rtems_gpio_driver = {
"gpio",
imx_rtems_gpio_methods,
sizeof(struct imx_rtems_gpio_softc),
};
static devclass_t imx_rtems_gpio_devclass;
EARLY_DRIVER_MODULE(imx_rtems_gpio, simplebus, imx_rtems_gpio_driver,
imx_rtems_gpio_devclass, NULL, NULL,
BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
#endif /* LIBBSP_ARM_IMX_BSP_H */
