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freebsd-skq/sys/powerpc/wii/wii_gpio.c
Adrian Chadd 31ec0f7a83 Initial support for running FreeBSD on the Nintendo Wii. We're able to 
reach single user mode using a memory disk device as the file system.

This port includes the framebuffer driver, the PIC driver, a platform
driver and the GPIO driver. The IPC driver (to talk to IOS kernels) is
not yet written but there's a placeholder for it.

There are still some MMU problems and to get a working system you need to
patch locore32.S. Since we haven't found the best way yet to address that
problem, we're not committing those changes yet. The problem is related to
the different BAT layout on the Wii and to the fact that the Homebrew
loader doesn't clean up the special registers (including the 8 BATs)
before passing control to us.

You'll need a Wii with Homebrew loader and a TV that can do NTSC (for now).

Submitted by:	Margarida Gouveia
2012-08-21 06:31:26 +00:00

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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 <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_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 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),
{ 0, 0 },
};
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)
{
return (bus_space_read_4(sc->sc_bt, sc->sc_bh, 0));
}
static __inline void
wiigpio_write(struct wiigpio_softc *sc, uint32_t reg)
{
bus_space_write_4(sc->sc_bt, sc->sc_bh, 0, 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;
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);
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;
sc->sc_pins[i].gp_flags = 0;
snprintf(sc->sc_pins[i].gp_name, GPIOMAXNAME, "PIN %d", i);
}
device_add_child(dev, "gpioc", device_get_unit(dev));
device_add_child(dev, "gpiobus", device_get_unit(dev));
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);
*val = !!(reg & (1 << 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, pinmask = 1 << pin;
if (pin >= WIIGPIO_NPINS)
return (EINVAL);
sc = device_get_softc(dev);
WIIGPIO_LOCK(sc);
reg = wiigpio_read(sc) & ~pinmask;
if (value)
reg |= pinmask;
wiigpio_write(sc, reg);
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_toggle(device_t dev, uint32_t pin)
{
struct wiigpio_softc *sc;
uint32_t val, pinmask = 1 << pin;
sc = device_get_softc(dev);
WIIGPIO_LOCK(sc);
val = wiigpio_read(sc) & pinmask;
if (val)
wiigpio_write(sc, wiigpio_read(sc) & ~pinmask);
else
wiigpio_write(sc, wiigpio_read(sc) | pinmask);
WIIGPIO_UNLOCK(sc);
return (0);
}
static int
wiigpio_pin_setflags(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);
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);
}
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