359 lines
9.2 KiB
C
359 lines
9.2 KiB
C
/*-
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* Copyright (C) 2012 Margarida Gouveia
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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#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/module.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/gpio.h>
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#include <sys/reboot.h>
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#include <machine/bus.h>
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#include <machine/platform.h>
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#include <machine/intr_machdep.h>
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#include <machine/resource.h>
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#include <powerpc/wii/wii_gpioreg.h>
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#include "gpio_if.h"
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struct wiigpio_softc {
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device_t sc_dev;
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struct resource *sc_rres;
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bus_space_tag_t sc_bt;
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bus_space_handle_t sc_bh;
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int sc_rrid;
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struct mtx sc_mtx;
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struct gpio_pin sc_pins[WIIGPIO_NPINS];
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};
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#define WIIGPIO_PINBANK(_p) ((_p) / (WIIGPIO_NPINS / 2))
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#define WIIGPIO_PINMASK(_p) (1 << ((_p) % (WIIGPIO_NPINS / 2)))
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#define WIIGPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
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#define WIIGPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
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static int wiigpio_probe(device_t);
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static int wiigpio_attach(device_t);
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static int wiigpio_detach(device_t);
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static int wiigpio_pin_max(device_t, int *);
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static int wiigpio_pin_getname(device_t, uint32_t, char *);
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static int wiigpio_pin_getflags(device_t, uint32_t, uint32_t *);
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static int wiigpio_pin_setflags(device_t, uint32_t, uint32_t);
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static int wiigpio_pin_getcaps(device_t, uint32_t, uint32_t *);
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static int wiigpio_pin_get(device_t, uint32_t, unsigned int *);
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static int wiigpio_pin_set(device_t, uint32_t, unsigned int);
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static int wiigpio_pin_toggle(device_t, uint32_t);
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static void wiigpio_shutdown(void *, int);
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static device_method_t wiigpio_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, wiigpio_probe),
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DEVMETHOD(device_attach, wiigpio_attach),
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DEVMETHOD(device_detach, wiigpio_detach),
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/* GPIO protocol */
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DEVMETHOD(gpio_pin_max, wiigpio_pin_max),
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DEVMETHOD(gpio_pin_getname, wiigpio_pin_getname),
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DEVMETHOD(gpio_pin_getflags, wiigpio_pin_getflags),
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DEVMETHOD(gpio_pin_setflags, wiigpio_pin_setflags),
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DEVMETHOD(gpio_pin_getcaps, wiigpio_pin_getcaps),
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DEVMETHOD(gpio_pin_get, wiigpio_pin_get),
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DEVMETHOD(gpio_pin_set, wiigpio_pin_set),
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DEVMETHOD(gpio_pin_toggle, wiigpio_pin_toggle),
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DEVMETHOD_END
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};
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static driver_t wiigpio_driver = {
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"wiigpio",
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wiigpio_methods,
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sizeof(struct wiigpio_softc)
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};
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static devclass_t wiigpio_devclass;
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DRIVER_MODULE(wiigpio, wiibus, wiigpio_driver, wiigpio_devclass, 0, 0);
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static __inline uint32_t
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wiigpio_read(struct wiigpio_softc *sc, int n)
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{
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return (bus_space_read_4(sc->sc_bt, sc->sc_bh, n * 0x20));
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}
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static __inline void
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wiigpio_write(struct wiigpio_softc *sc, int n, uint32_t reg)
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{
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bus_space_write_4(sc->sc_bt, sc->sc_bh, n * 0x20, reg);
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}
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static __inline uint32_t
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wiigpio_dir_read(struct wiigpio_softc *sc, int n)
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{
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return (bus_space_read_4(sc->sc_bt, sc->sc_bh, n * 0x20 + 4));
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}
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static __inline void
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wiigpio_dir_write(struct wiigpio_softc *sc, int n, uint32_t reg)
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{
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bus_space_write_4(sc->sc_bt, sc->sc_bh, n * 0x20 + 4, reg);
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}
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static int
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wiigpio_probe(device_t dev)
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{
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device_set_desc(dev, "Nintendo Wii GPIO");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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wiigpio_attach(device_t dev)
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{
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struct wiigpio_softc *sc;
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int i;
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uint32_t d;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_rrid = 0;
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sc->sc_rres = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
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&sc->sc_rrid, RF_ACTIVE);
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if (sc->sc_rres == NULL) {
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device_printf(dev, "could not alloc mem resource\n");
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return (ENXIO);
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}
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sc->sc_bt = rman_get_bustag(sc->sc_rres);
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sc->sc_bh = rman_get_bushandle(sc->sc_rres);
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mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
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#ifdef WIIGPIO_DEBUG
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device_printf(dev, "dir bank0=0x%08x bank1=0x%08x\n",
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wiigpio_dir_read(sc, 0), wiigpio_dir_read(sc, 1));
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device_printf(dev, "val bank0=0x%08x bank1=0x%08x\n",
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wiigpio_read(sc, 0), wiigpio_read(sc, 1));
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#endif
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for (i = 0; i < WIIGPIO_NPINS; i++) {
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sc->sc_pins[i].gp_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
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sc->sc_pins[i].gp_pin = i;
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d = wiigpio_dir_read(sc, WIIGPIO_PINBANK(i));
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if (d & WIIGPIO_PINMASK(i))
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sc->sc_pins[i].gp_flags = GPIO_PIN_OUTPUT;
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else
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sc->sc_pins[i].gp_flags = GPIO_PIN_INPUT;
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snprintf(sc->sc_pins[i].gp_name, GPIOMAXNAME, "PIN %d", i);
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#ifdef WIIGPIO_DEBUG
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device_printf(dev, "PIN %d state %d flag %s\n", i,
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wiigpio_read(sc, WIIGPIO_PINBANK(i)) >>
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(i % (WIIGPIO_NPINS / 2)) & 1,
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sc->sc_pins[i].gp_flags == GPIO_PIN_INPUT ?
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"GPIO_PIN_INPUT" : "GPIO_PIN_OUTPUT");
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#endif
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}
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device_add_child(dev, "gpioc", device_get_unit(dev));
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device_add_child(dev, "gpiobus", device_get_unit(dev));
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/*
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* We will be responsible for powering off the system.
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*/
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EVENTHANDLER_REGISTER(shutdown_final, wiigpio_shutdown, dev,
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SHUTDOWN_PRI_LAST);
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return (bus_generic_attach(dev));
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}
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static int
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wiigpio_detach(device_t dev)
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{
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struct wiigpio_softc *sc;
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sc = device_get_softc(dev);
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bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_rrid, sc->sc_rres);
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mtx_destroy(&sc->sc_mtx);
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return (0);
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}
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static int
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wiigpio_pin_max(device_t dev, int *maxpin)
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{
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*maxpin = WIIGPIO_NPINS - 1;
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return (0);
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}
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static int
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wiigpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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struct wiigpio_softc *sc;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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sc = device_get_softc(dev);
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*caps = sc->sc_pins[pin].gp_caps;
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return (0);
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}
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static int
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wiigpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
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{
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struct wiigpio_softc *sc;
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uint32_t reg;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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sc = device_get_softc(dev);
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WIIGPIO_LOCK(sc);
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reg = wiigpio_read(sc, WIIGPIO_PINBANK(pin));
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*val = !!(reg & WIIGPIO_PINMASK(pin));
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WIIGPIO_UNLOCK(sc);
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return (0);
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}
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static int
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wiigpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
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{
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struct wiigpio_softc *sc;
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uint32_t reg, pinbank, pinmask;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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sc = device_get_softc(dev);
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pinbank = WIIGPIO_PINBANK(pin);
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pinmask = WIIGPIO_PINMASK(pin);
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WIIGPIO_LOCK(sc);
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reg = wiigpio_read(sc, pinbank) & ~pinmask;
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if (value)
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reg |= pinmask;
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wiigpio_write(sc, pinbank, reg);
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WIIGPIO_UNLOCK(sc);
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return (0);
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}
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static int
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wiigpio_pin_toggle(device_t dev, uint32_t pin)
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{
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struct wiigpio_softc *sc;
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uint32_t val, pinbank, pinmask;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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sc = device_get_softc(dev);
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pinbank = WIIGPIO_PINBANK(pin);
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pinmask = WIIGPIO_PINMASK(pin);
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WIIGPIO_LOCK(sc);
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val = wiigpio_read(sc, pinbank);
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if (val & pinmask)
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wiigpio_write(sc, pinbank, val & ~pinmask);
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else
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wiigpio_write(sc, pinbank, val | pinmask);
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WIIGPIO_UNLOCK(sc);
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return (0);
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}
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static int
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wiigpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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struct wiigpio_softc *sc;
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uint32_t reg, pinbank, pinmask;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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if ((flags & ~(GPIO_PIN_OUTPUT|GPIO_PIN_INPUT)) != 0)
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return (EINVAL);
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if ((flags & (GPIO_PIN_OUTPUT|GPIO_PIN_INPUT)) ==
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(GPIO_PIN_OUTPUT|GPIO_PIN_INPUT))
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return (EINVAL);
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sc = device_get_softc(dev);
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pinbank = WIIGPIO_PINBANK(pin);
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pinmask = WIIGPIO_PINMASK(pin);
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WIIGPIO_LOCK(sc);
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reg = wiigpio_dir_read(sc, WIIGPIO_PINBANK(pin));
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if (flags & GPIO_PIN_OUTPUT)
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wiigpio_dir_write(sc, pinbank, reg | pinmask);
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else
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wiigpio_dir_write(sc, pinbank, reg & ~pinmask);
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sc->sc_pins[pin].gp_flags = flags;
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WIIGPIO_UNLOCK(sc);
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return (0);
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}
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static int
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wiigpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct wiigpio_softc *sc;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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sc = device_get_softc(dev);
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WIIGPIO_LOCK(sc);
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*flags = sc->sc_pins[pin].gp_flags;
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WIIGPIO_UNLOCK(sc);
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return (0);
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}
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static int
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wiigpio_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct wiigpio_softc *sc;
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if (pin >= WIIGPIO_NPINS)
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return (EINVAL);
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sc = device_get_softc(dev);
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WIIGPIO_LOCK(sc);
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memcpy(name, sc->sc_pins[pin].gp_name, GPIOMAXNAME);
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WIIGPIO_UNLOCK(sc);
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return (0);
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}
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static void
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wiigpio_shutdown(void *xdev, int howto)
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{
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device_t dev;
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if (!(howto & RB_POWEROFF))
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return;
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dev = (device_t)xdev;
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wiigpio_pin_setflags(dev, WIIGPIO_POWEROFF_PIN, GPIO_PIN_OUTPUT);
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wiigpio_pin_set(dev, WIIGPIO_POWEROFF_PIN, 1);
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}
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