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/*
* Copyright (c) 2025 Stephen Hurd <shurd@FreeBSD.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/syscon/syscon.h>
#include "syscon_if.h"
#define GRF_SOC_CON10 0x0428
#define SOC_CON10_GPIOMUT (1 << 1)
#define SOC_CON10_GPIOMUT_MASK ((1 << 1) << 16)
#define SOC_CON10_GPIOMUT_EN (1 << 0)
#define SOC_CON10_GPIOMUT_EN_MASK ((1 << 0) << 16)
struct rk_grf_gpio_softc {
device_t sc_dev;
device_t sc_busdev;
struct syscon *sc_grf;
bool active_high;
};
static struct ofw_compat_data compat_data[] = {
{"rockchip,rk3328-grf-gpio", 1},
{NULL, 0}
};
static device_t
rk_grf_gpio_get_bus(device_t dev)
{
struct rk_grf_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->sc_busdev);
}
static int
rk_grf_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = 1;
return (0);
}
static int
rk_grf_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
if (pin)
return (EINVAL);
snprintf(name, GPIOMAXNAME, "GPIO_MUTE");
return (0);
}
static int
rk_grf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
if (pin)
return (EINVAL);
*flags = GPIO_PIN_OUTPUT;
return (0);
}
static int
rk_grf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
if (pin)
return (EINVAL);
if (flags != GPIO_PIN_OUTPUT)
return (EINVAL);
return (0);
}
static int
rk_grf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
if (pin)
return (EINVAL);
*caps = GPIO_PIN_OUTPUT;
return (0);
}
static int
rk_grf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
{
struct rk_grf_gpio_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
if (pin)
return (EINVAL);
reg = SYSCON_READ_4(sc->sc_grf, GRF_SOC_CON10);
if (reg & SOC_CON10_GPIOMUT)
*val = 1;
else
*val = 0;
return (0);
}
static int
rk_grf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct rk_grf_gpio_softc *sc;
uint32_t val;
sc = device_get_softc(dev);
if (pin)
return (EINVAL);
val = SOC_CON10_GPIOMUT_MASK;
if (value)
val |= SOC_CON10_GPIOMUT;
SYSCON_WRITE_4(sc->sc_grf, GRF_SOC_CON10, val);
return (0);
}
static int
rk_grf_gpio_map_gpios(device_t bus, phandle_t dev, phandle_t gparent, int gcells,
pcell_t *gpios, uint32_t *pin, uint32_t *flags)
{
if (gpios[0])
return (EINVAL);
/* The gpios are mapped as <pin flags> */
*pin = 0;
/* TODO: The only valid flags are active low or active high */
*flags = GPIO_PIN_OUTPUT;
return (0);
}
static int
rk_grf_gpio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "RockChip General Register File GPIO (GPIO_MUTE)");
return (BUS_PROBE_DEFAULT);
}
static int
rk_grf_gpio_attach(device_t dev)
{
struct rk_grf_gpio_softc *sc;
phandle_t parent_node, node;
device_t pdev;
sc = device_get_softc(dev);
sc->sc_dev = dev;
node = ofw_bus_get_node(sc->sc_dev);
if (!OF_hasprop(node, "gpio-controller"))
return (ENXIO);
pdev = device_get_parent(dev);
parent_node = ofw_bus_get_node(pdev);
if (syscon_get_by_ofw_node(dev, parent_node, &sc->sc_grf) != 0) {
device_printf(dev, "cannot get parent syscon handle\n");
return (ENXIO);
}
sc->sc_busdev = gpiobus_attach_bus(dev);
if (sc->sc_busdev == NULL) {
return (ENXIO);
}
return (0);
}
static int
rk_grf_gpio_detach(device_t dev)
{
struct rk_grf_gpio_softc *sc;
sc = device_get_softc(dev);
if (sc->sc_busdev)
gpiobus_detach_bus(dev);
return(0);
}
static device_method_t rk_grf_gpio_methods[] = {
DEVMETHOD(device_probe, rk_grf_gpio_probe),
DEVMETHOD(device_attach, rk_grf_gpio_attach),
DEVMETHOD(device_detach, rk_grf_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, rk_grf_gpio_get_bus),
DEVMETHOD(gpio_pin_max, rk_grf_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, rk_grf_gpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, rk_grf_gpio_pin_getflags),
DEVMETHOD(gpio_pin_setflags, rk_grf_gpio_pin_setflags),
DEVMETHOD(gpio_pin_getcaps, rk_grf_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_get, rk_grf_gpio_pin_get),
DEVMETHOD(gpio_pin_set, rk_grf_gpio_pin_set),
DEVMETHOD(gpio_map_gpios, rk_grf_gpio_map_gpios),
DEVMETHOD_END
};
static driver_t rk_grf_gpio_driver = {
"gpio",
rk_grf_gpio_methods,
sizeof(struct rk_grf_gpio_softc),
};
/*
* GPIO driver is always a child of rk_grf driver and should be probed
* and attached within rk_grf function. Due to this, bus pass order
* must be same as bus pass order of rk_grf driver.
*/
EARLY_DRIVER_MODULE(rk_grf_gpio, simplebus, rk_grf_gpio_driver, 0, 0,
BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
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