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/*-
* Copyright (C) 2012 Margarida Gouveia
* All rights reserved.
*
* 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 AUTHOR ``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 AUTHOR 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/gpio.h>
#include <sys/reboot.h>
#include <machine/bus.h>
#include <machine/platform.h>
#include <machine/intr_machdep.h>
#include <machine/resource.h>
#include <powerpc/wii/wii_gpioreg.h>
#include "gpio_if.h"
struct wiigpio_softc {
device_t sc_dev;
struct resource *sc_rres;
bus_space_tag_t sc_bt;
bus_space_handle_t sc_bh;
int sc_rrid;
struct mtx sc_mtx;
struct gpio_pin sc_pins[WIIGPIO_NPINS];
};
#define WIIGPIO_PINBANK(_p) ((_p) / (WIIGPIO_NPINS / 2))
#define WIIGPIO_PINMASK(_p) (1 << ((_p) % (WIIGPIO_NPINS / 2)))
#define WIIGPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
#define WIIGPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
static int wiigpio_probe(device_t);
static int wiigpio_attach(device_t);
static int wiigpio_detach(device_t);
static int wiigpio_pin_max(device_t, int *);
static int wiigpio_pin_getname(device_t, uint32_t, char *);
static int wiigpio_pin_getflags(device_t, uint32_t, uint32_t *);
static int wiigpio_pin_setflags(device_t, uint32_t, uint32_t);
static int wiigpio_pin_getcaps(device_t, uint32_t, uint32_t *);
static int wiigpio_pin_get(device_t, uint32_t, unsigned int *);
static int wiigpio_pin_set(device_t, uint32_t, unsigned int);
static int wiigpio_pin_toggle(device_t, uint32_t);
static void wiigpio_shutdown(void *, int);
static device_method_t wiigpio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, wiigpio_probe),
DEVMETHOD(device_attach, wiigpio_attach),
DEVMETHOD(device_detach, wiigpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_pin_max, wiigpio_pin_max),
DEVMETHOD(gpio_pin_getname, wiigpio_pin_getname),
DEVMETHOD(gpio_pin_getflags, wiigpio_pin_getflags),
DEVMETHOD(gpio_pin_setflags, wiigpio_pin_setflags),
DEVMETHOD(gpio_pin_getcaps, wiigpio_pin_getcaps),
DEVMETHOD(gpio_pin_get, wiigpio_pin_get),
DEVMETHOD(gpio_pin_set, wiigpio_pin_set),
DEVMETHOD(gpio_pin_toggle, wiigpio_pin_toggle),
DEVMETHOD_END
};
static driver_t wiigpio_driver = {
"wiigpio",
wiigpio_methods,
sizeof(struct wiigpio_softc)
};
static devclass_t wiigpio_devclass;
DRIVER_MODULE(wiigpio, wiibus, wiigpio_driver, wiigpio_devclass, 0, 0);
static __inline uint32_t
wiigpio_read(struct wiigpio_softc *sc, int n)
{
return (bus_space_read_4(sc->sc_bt, sc->sc_bh, n * 0x20));
}
static __inline void
wiigpio_write(struct wiigpio_softc *sc, int n, uint32_t reg)
{
bus_space_write_4(sc->sc_bt, sc->sc_bh, n * 0x20, reg);
}
static __inline uint32_t
wiigpio_dir_read(struct wiigpio_softc *sc, int n)
{
return (bus_space_read_4(sc->sc_bt, sc->sc_bh, n * 0x20 + 4));
}
static __inline void
wiigpio_dir_write(struct wiigpio_softc *sc, int n, uint32_t reg)
{
bus_space_write_4(sc->sc_bt, sc->sc_bh, n * 0x20 + 4, reg);
}
static int
wiigpio_probe(device_t dev)
{
device_set_desc(dev, "Nintendo Wii GPIO");
return (BUS_PROBE_NOWILDCARD);
}
static int
wiigpio_attach(device_t dev)
{
struct wiigpio_softc *sc;
int i;
uint32_t d;
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_rrid = 0;
sc->sc_rres = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&sc->sc_rrid, RF_ACTIVE);
if (sc->sc_rres == NULL) {
device_printf(dev, "could not alloc mem resource\n");
return (ENXIO);
}
sc->sc_bt = rman_get_bustag(sc->sc_rres);
sc->sc_bh = rman_get_bushandle(sc->sc_rres);
mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
#ifdef WIIGPIO_DEBUG
device_printf(dev, "dir bank0=0x%08x bank1=0x%08x\n",
wiigpio_dir_read(sc, 0), wiigpio_dir_read(sc, 1));
device_printf(dev, "val bank0=0x%08x bank1=0x%08x\n",
wiigpio_read(sc, 0), wiigpio_read(sc, 1));
#endif
for (i = 0; i < WIIGPIO_NPINS; i++) {
sc->sc_pins[i].gp_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
sc->sc_pins[i].gp_pin = i;
d = wiigpio_dir_read(sc, WIIGPIO_PINBANK(i));
if (d & WIIGPIO_PINMASK(i))
sc->sc_pins[i].gp_flags = GPIO_PIN_OUTPUT;
else
sc->sc_pins[i].gp_flags = GPIO_PIN_INPUT;
snprintf(sc->sc_pins[i].gp_name, GPIOMAXNAME, "PIN %d", i);
#ifdef WIIGPIO_DEBUG
device_printf(dev, "PIN %d state %d flag %s\n", i,
wiigpio_read(sc, WIIGPIO_PINBANK(i)) >>
(i % (WIIGPIO_NPINS / 2)) & 1,
sc->sc_pins[i].gp_flags == GPIO_PIN_INPUT ?
"GPIO_PIN_INPUT" : "GPIO_PIN_OUTPUT");
#endif
}
device_add_child(dev, "gpioc", -1);
device_add_child(dev, "gpiobus", -1);
/*
* We will be responsible for powering off the system.
*/
EVENTHANDLER_REGISTER(shutdown_final, wiigpio_shutdown, dev,
SHUTDOWN_PRI_LAST);
return (bus_generic_attach(dev));
}
static int
wiigpio_detach(device_t dev)
{
struct wiigpio_softc *sc;
sc = device_get_softc(dev);
bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_rrid, sc->sc_rres);
mtx_destroy(&sc->sc_mtx);
return (0);
}
static int
wiigpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = WIIGPIO_NPINS - 1;
return (0);
}
static int
wiigpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
struct wiigpio_softc *sc;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
*caps = sc->sc_pins[pin].gp_caps;
return (0);
}
static int
wiigpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
{
struct wiigpio_softc *sc;
uint32_t reg;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
WIIGPIO_LOCK(sc);
reg = wiigpio_read(sc, WIIGPIO_PINBANK(pin));
*val = !!(reg & WIIGPIO_PINMASK(pin));
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct wiigpio_softc *sc;
uint32_t reg, pinbank, pinmask;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
pinbank = WIIGPIO_PINBANK(pin);
pinmask = WIIGPIO_PINMASK(pin);
WIIGPIO_LOCK(sc);
reg = wiigpio_read(sc, pinbank) & ~pinmask;
if (value)
reg |= pinmask;
wiigpio_write(sc, pinbank, reg);
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_toggle(device_t dev, uint32_t pin)
{
struct wiigpio_softc *sc;
uint32_t val, pinbank, pinmask;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
pinbank = WIIGPIO_PINBANK(pin);
pinmask = WIIGPIO_PINMASK(pin);
WIIGPIO_LOCK(sc);
val = wiigpio_read(sc, pinbank);
if (val & pinmask)
wiigpio_write(sc, pinbank, val & ~pinmask);
else
wiigpio_write(sc, pinbank, val | pinmask);
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct wiigpio_softc *sc;
uint32_t reg, pinbank, pinmask;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
pinbank = WIIGPIO_PINBANK(pin);
pinmask = WIIGPIO_PINMASK(pin);
WIIGPIO_LOCK(sc);
reg = wiigpio_dir_read(sc, WIIGPIO_PINBANK(pin));
if (flags & GPIO_PIN_OUTPUT)
wiigpio_dir_write(sc, pinbank, reg | pinmask);
else
wiigpio_dir_write(sc, pinbank, reg & ~pinmask);
sc->sc_pins[pin].gp_flags = flags;
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct wiigpio_softc *sc;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
WIIGPIO_LOCK(sc);
*flags = sc->sc_pins[pin].gp_flags;
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct wiigpio_softc *sc;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
WIIGPIO_LOCK(sc);
memcpy(name, sc->sc_pins[pin].gp_name, GPIOMAXNAME);
WIIGPIO_UNLOCK(sc);
return (0);
}
static void
wiigpio_shutdown(void *xdev, int howto)
{
device_t dev;
if (!(howto & RB_POWEROFF))
return;
dev = (device_t)xdev;
wiigpio_pin_setflags(dev, WIIGPIO_POWEROFF_PIN, GPIO_PIN_OUTPUT);
wiigpio_pin_set(dev, WIIGPIO_POWEROFF_PIN, 1);
}
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