372 lines
8.8 KiB
C
372 lines
8.8 KiB
C
/*-
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* Copyright 2013-2015 John Wehle <john@feith.com>
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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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* Amlogic aml8726 GPIO driver.
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*
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* Note: The OEN register is active * low *. Setting a bit to zero
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* enables the output driver, setting a bit to one disables the driver.
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*/
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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/systm.h>
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#include <sys/conf.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/lock.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/gpio.h>
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#include <machine/bus.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 <dev/gpio/gpiobusvar.h>
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#include "gpio_if.h"
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struct aml8726_gpio_softc {
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device_t dev;
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struct resource *res[3];
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struct mtx mtx;
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uint32_t npins;
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device_t busdev;
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};
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static struct resource_spec aml8726_gpio_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE | RF_SHAREABLE }, /* oen */
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{ SYS_RES_MEMORY, 1, RF_ACTIVE | RF_SHAREABLE }, /* output */
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{ SYS_RES_MEMORY, 2, RF_ACTIVE }, /* input */
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{ -1, 0 }
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};
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#define AML_GPIO_LOCK(sc) mtx_lock(&(sc)->mtx)
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#define AML_GPIO_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
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#define AML_GPIO_LOCK_INIT(sc) \
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mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
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"gpio", MTX_DEF)
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#define AML_GPIO_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
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#define AML_GPIO_OE_N_REG 0
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#define AML_GPIO_OUT_REG 1
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#define AML_GPIO_IN_REG 2
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#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[reg], 0, (val))
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#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[reg], 0)
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static int
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aml8726_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_is_compatible(dev, "amlogic,aml8726-gpio"))
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return (ENXIO);
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device_set_desc(dev, "Amlogic aml8726 GPIO");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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aml8726_gpio_attach(device_t dev)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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phandle_t node;
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pcell_t prop;
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sc->dev = dev;
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node = ofw_bus_get_node(dev);
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if (OF_getencprop(node, "pin-count",
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&prop, sizeof(prop)) <= 0) {
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device_printf(dev, "missing pin-count attribute in FDT\n");
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return (ENXIO);
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}
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sc->npins = prop;
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if (sc->npins > 32)
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return (ENXIO);
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if (bus_alloc_resources(dev, aml8726_gpio_spec, sc->res)) {
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device_printf(dev, "can not allocate resources for device\n");
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return (ENXIO);
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}
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/*
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* The GPIOAO OUT bits occupy the upper word of the OEN register.
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*/
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if (rman_get_start(sc->res[1]) == rman_get_start(sc->res[0]))
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if (sc->npins > 16) {
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device_printf(dev,
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"too many pins for overlapping OEN and OUT\n");
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bus_release_resources(dev, aml8726_gpio_spec, sc->res);
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return (ENXIO);
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}
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AML_GPIO_LOCK_INIT(sc);
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sc->busdev = gpiobus_attach_bus(dev);
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if (sc->busdev == NULL) {
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AML_GPIO_LOCK_DESTROY(sc);
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bus_release_resources(dev, aml8726_gpio_spec, sc->res);
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return (ENXIO);
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}
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return (0);
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}
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static int
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aml8726_gpio_detach(device_t dev)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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gpiobus_detach_bus(dev);
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AML_GPIO_LOCK_DESTROY(sc);
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bus_release_resources(dev, aml8726_gpio_spec, sc->res);
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return (0);
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}
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static device_t
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aml8726_gpio_get_bus(device_t dev)
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{
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struct aml8726_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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aml8726_gpio_pin_max(device_t dev, int *maxpin)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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*maxpin = (int)sc->npins;
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return (0);
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}
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/* Get a specific pin's capabilities. */
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static int
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aml8726_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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if (pin >= sc->npins)
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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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aml8726_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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if (pin >= sc->npins)
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return (EINVAL);
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snprintf(name, GPIOMAXNAME, "%s.%u", ofw_bus_get_name(dev), pin);
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return (0);
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}
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/* Get a specific pin's current in/out state. */
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static int
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aml8726_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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uint32_t mask = 1U << pin;
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if (pin >= sc->npins)
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return (EINVAL);
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if ((CSR_READ_4(sc, AML_GPIO_OE_N_REG) & mask) == 0) {
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/* output */
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*flags = GPIO_PIN_OUTPUT;
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} else
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/* input */
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*flags = GPIO_PIN_INPUT;
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return (0);
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}
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/* Set a specific pin's in/out state. */
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static int
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aml8726_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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uint32_t mask = 1U << pin;
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if (pin >= sc->npins)
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return (EINVAL);
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AML_GPIO_LOCK(sc);
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if ((flags & GPIO_PIN_OUTPUT) != 0) {
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/* Output. Turn on driver. */
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CSR_WRITE_4(sc, AML_GPIO_OE_N_REG,
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(CSR_READ_4(sc, AML_GPIO_OE_N_REG) & ~mask));
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} else {
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/* Input. Turn off driver. */
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CSR_WRITE_4(sc, AML_GPIO_OE_N_REG,
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(CSR_READ_4(sc, AML_GPIO_OE_N_REG) | mask));
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}
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AML_GPIO_UNLOCK(sc);
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return (0);
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}
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/* Set a specific output pin's value. */
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static int
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aml8726_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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uint32_t mask;
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if (pin >= sc->npins || value > 1)
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return (EINVAL);
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/*
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* The GPIOAO OUT bits occupy the upper word of the OEN register.
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*/
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if (rman_get_start(sc->res[1]) == rman_get_start(sc->res[0]))
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pin += 16;
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mask = 1U << pin;
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AML_GPIO_LOCK(sc);
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CSR_WRITE_4(sc, AML_GPIO_OUT_REG,
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((CSR_READ_4(sc, AML_GPIO_OUT_REG) & ~mask) | (value << pin)));
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AML_GPIO_UNLOCK(sc);
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return (0);
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}
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/* Get a specific pin's input value. */
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static int
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aml8726_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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uint32_t mask = 1U << pin;
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if (pin >= sc->npins)
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return (EINVAL);
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*value = (CSR_READ_4(sc, AML_GPIO_IN_REG) & mask) ? 1 : 0;
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return (0);
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}
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/* Toggle a pin's output value. */
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static int
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aml8726_gpio_pin_toggle(device_t dev, uint32_t pin)
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{
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struct aml8726_gpio_softc *sc = device_get_softc(dev);
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uint32_t mask;
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if (pin >= sc->npins)
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return (EINVAL);
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/*
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* The GPIOAO OUT bits occupy the upper word of the OEN register.
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*/
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if (rman_get_start(sc->res[1]) == rman_get_start(sc->res[0]))
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pin += 16;
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mask = 1U << pin;
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AML_GPIO_LOCK(sc);
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CSR_WRITE_4(sc, AML_GPIO_OUT_REG,
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CSR_READ_4(sc, AML_GPIO_OUT_REG) ^ mask);
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AML_GPIO_UNLOCK(sc);
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return (0);
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}
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static phandle_t
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aml8726_gpio_get_node(device_t bus, device_t dev)
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{
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/* We only have one child, the GPIO bus, which needs our own node. */
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return (ofw_bus_get_node(bus));
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}
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static device_method_t aml8726_gpio_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, aml8726_gpio_probe),
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DEVMETHOD(device_attach, aml8726_gpio_attach),
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DEVMETHOD(device_detach, aml8726_gpio_detach),
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/* GPIO interface */
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DEVMETHOD(gpio_get_bus, aml8726_gpio_get_bus),
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DEVMETHOD(gpio_pin_max, aml8726_gpio_pin_max),
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DEVMETHOD(gpio_pin_getname, aml8726_gpio_pin_getname),
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DEVMETHOD(gpio_pin_getflags, aml8726_gpio_pin_getflags),
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DEVMETHOD(gpio_pin_getcaps, aml8726_gpio_pin_getcaps),
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DEVMETHOD(gpio_pin_setflags, aml8726_gpio_pin_setflags),
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DEVMETHOD(gpio_pin_get, aml8726_gpio_pin_get),
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DEVMETHOD(gpio_pin_set, aml8726_gpio_pin_set),
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DEVMETHOD(gpio_pin_toggle, aml8726_gpio_pin_toggle),
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/* ofw_bus interface */
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DEVMETHOD(ofw_bus_get_node, aml8726_gpio_get_node),
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DEVMETHOD_END
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};
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static driver_t aml8726_gpio_driver = {
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"gpio",
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aml8726_gpio_methods,
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sizeof(struct aml8726_gpio_softc),
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};
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static devclass_t aml8726_gpio_devclass;
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DRIVER_MODULE(aml8726_gpio, simplebus, aml8726_gpio_driver,
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aml8726_gpio_devclass, 0, 0);
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