297 lines
6.8 KiB
C
297 lines
6.8 KiB
C
/*-
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* Copyright (c) 2015 Justin Hibbits
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* Copyright (c) 2013 Thomas Skibo
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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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* $FreeBSD$
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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 <machine/resource.h>
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#include <machine/stdarg.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 "gpio_if.h"
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#define MAXPIN (7)
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#define VALID_PIN(u) ((u) >= 0 && (u) <= MAXPIN)
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#define GPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
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#define GPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
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#define GPIO_LOCK_INIT(sc) \
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mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \
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"gpio", MTX_DEF)
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#define GPIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
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struct mpc85xx_gpio_softc {
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device_t dev;
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device_t busdev;
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struct mtx sc_mtx;
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struct resource *out_res; /* Memory resource */
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struct resource *in_res;
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};
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static device_t
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mpc85xx_gpio_get_bus(device_t dev)
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{
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struct mpc85xx_gpio_softc *sc;
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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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mpc85xx_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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/* Get a specific pin's capabilities. */
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static int
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mpc85xx_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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mpc85xx_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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if (!VALID_PIN(pin))
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return (EINVAL);
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snprintf(name, GPIOMAXNAME, "GPIO%d", pin);
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name[GPIOMAXNAME-1] = '\0';
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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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mpc85xx_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
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uint32_t outvals;
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uint8_t pinbit;
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if (!VALID_PIN(pin) || value > 1)
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return (EINVAL);
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GPIO_LOCK(sc);
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pinbit = 31 - pin;
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outvals = bus_read_4(sc->out_res, 0);
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outvals &= ~(1 << pinbit);
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outvals |= (value << pinbit);
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bus_write_4(sc->out_res, 0, outvals);
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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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mpc85xx_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
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{
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struct mpc85xx_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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*value = (bus_read_4(sc->in_res, 0) >> (31 - pin)) & 1;
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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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mpc85xx_gpio_pin_toggle(device_t dev, uint32_t pin)
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{
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struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
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uint32_t val;
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if (!VALID_PIN(pin))
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return (EINVAL);
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GPIO_LOCK(sc);
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val = bus_read_4(sc->out_res, 0);
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val ^= (1 << (31 - pin));
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bus_write_4(sc->out_res, 0, val);
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GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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mpc85xx_gpio_probe(device_t dev)
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{
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uint32_t svr;
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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, "gpio"))
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return (ENXIO);
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svr = mfspr(SPR_SVR);
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switch (SVR_VER(svr)) {
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case SVR_MPC8533:
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case SVR_MPC8533E:
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break;
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default:
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return (ENXIO);
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}
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device_set_desc(dev, "MPC85xx GPIO driver");
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return (0);
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}
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static int mpc85xx_gpio_detach(device_t dev);
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static int
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mpc85xx_gpio_attach(device_t dev)
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{
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struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
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int rid;
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sc->dev = dev;
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GPIO_LOCK_INIT(sc);
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/* Allocate memory. */
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rid = 0;
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sc->out_res = bus_alloc_resource_any(dev,
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SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->out_res == NULL) {
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device_printf(dev, "Can't allocate memory for device output port");
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mpc85xx_gpio_detach(dev);
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return (ENOMEM);
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}
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rid = 1;
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sc->in_res = bus_alloc_resource_any(dev,
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SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->in_res == NULL) {
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device_printf(dev, "Can't allocate memory for device input port");
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mpc85xx_gpio_detach(dev);
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return (ENOMEM);
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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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mpc85xx_gpio_detach(dev);
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return (ENOMEM);
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}
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OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
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return (0);
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}
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static int
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mpc85xx_gpio_detach(device_t dev)
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{
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struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
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gpiobus_detach_bus(dev);
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if (sc->out_res != NULL) {
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/* Release output port resource. */
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bus_release_resource(dev, SYS_RES_MEMORY,
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rman_get_rid(sc->out_res), sc->out_res);
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}
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if (sc->in_res != NULL) {
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/* Release input port resource. */
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bus_release_resource(dev, SYS_RES_MEMORY,
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rman_get_rid(sc->in_res), sc->in_res);
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}
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GPIO_LOCK_DESTROY(sc);
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return (0);
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}
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static device_method_t mpc85xx_gpio_methods[] = {
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/* device_if */
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DEVMETHOD(device_probe, mpc85xx_gpio_probe),
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DEVMETHOD(device_attach, mpc85xx_gpio_attach),
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DEVMETHOD(device_detach, mpc85xx_gpio_detach),
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/* GPIO protocol */
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DEVMETHOD(gpio_get_bus, mpc85xx_gpio_get_bus),
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DEVMETHOD(gpio_pin_max, mpc85xx_gpio_pin_max),
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DEVMETHOD(gpio_pin_getname, mpc85xx_gpio_pin_getname),
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DEVMETHOD(gpio_pin_getcaps, mpc85xx_gpio_pin_getcaps),
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DEVMETHOD(gpio_pin_get, mpc85xx_gpio_pin_get),
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DEVMETHOD(gpio_pin_set, mpc85xx_gpio_pin_set),
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DEVMETHOD(gpio_pin_toggle, mpc85xx_gpio_pin_toggle),
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DEVMETHOD_END
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};
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static driver_t mpc85xx_gpio_driver = {
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"gpio",
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mpc85xx_gpio_methods,
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sizeof(struct mpc85xx_gpio_softc),
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};
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static devclass_t mpc85xx_gpio_devclass;
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EARLY_DRIVER_MODULE(mpc85xx_gpio, simplebus, mpc85xx_gpio_driver,
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mpc85xx_gpio_devclass, NULL, NULL,
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BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
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