freebsd-dev/sys/powerpc/mpc85xx/mpc85xx_gpio.c
Justin Hibbits 20d34e61aa Add a GPIO driver for the mpc85xx.
This has only been tested on the RB800, using the RB800's FDT, and pulls the
GPOUT and GPIN registers from the FDT.
2015-04-04 02:34:40 +00:00

308 lines
7.0 KiB
C

/*-
* Copyright (c) 2015 Justin Hibbits
* Copyright (c) 2013 Thomas Skibo
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/gpio.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/stdarg.h>
#include <dev/fdt/fdt_common.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "gpio_if.h"
#define MAXPIN (7)
#define VALID_PIN(u) ((u) >= 0 && (u) <= MAXPIN)
#define GPIO_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
#define GPIO_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
#define GPIO_LOCK_INIT(sc) \
mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev), \
"gpio", MTX_DEF)
#define GPIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
struct mpc85xx_gpio_softc {
device_t dev;
device_t busdev;
struct mtx sc_mtx;
struct resource *out_res; /* Memory resource */
struct resource *in_res;
};
static device_t
mpc85xx_gpio_get_bus(device_t dev)
{
struct mpc85xx_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->busdev);
}
static int
mpc85xx_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = MAXPIN;
return (0);
}
/* Get a specific pin's capabilities. */
static int
mpc85xx_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
if (!VALID_PIN(pin))
return (EINVAL);
*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT);
return (0);
}
/* Get a specific pin's name. */
static int
mpc85xx_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
if (!VALID_PIN(pin))
return (EINVAL);
snprintf(name, GPIOMAXNAME, "GPIO%d", pin);
name[GPIOMAXNAME-1] = '\0';
return (0);
}
/* Set a specific output pin's value. */
static int
mpc85xx_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
uint32_t outvals;
uint8_t pinbit;
if (!VALID_PIN(pin) || value > 1)
return (EINVAL);
GPIO_LOCK(sc);
pinbit = 31 - pin;
outvals = bus_read_4(sc->out_res, 0);
outvals &= ~(1 << pinbit);
outvals |= (value << pinbit);
bus_write_4(sc->out_res, 0, outvals);
GPIO_UNLOCK(sc);
return (0);
}
/* Get a specific pin's input value. */
static int
mpc85xx_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
{
struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
*value = (bus_read_4(sc->in_res, 0) >> (31 - pin)) & 1;
return (0);
}
/* Toggle a pin's output value. */
static int
mpc85xx_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
uint32_t val;
if (!VALID_PIN(pin))
return (EINVAL);
GPIO_LOCK(sc);
val = bus_read_4(sc->out_res, 0);
val ^= (1 << (31 - pin));
bus_write_4(sc->out_res, 0, val);
GPIO_UNLOCK(sc);
return (0);
}
static int
mpc85xx_gpio_probe(device_t dev)
{
uint16_t vers;
uint32_t svr;
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "gpio"))
return (ENXIO);
vers = mfpvr() >> 16;
switch (vers) {
case FSL_E500v1:
case FSL_E500v2:
case FSL_E500mc:
break;
default:
return (ENXIO);
}
svr = mfspr(SPR_SVR);
switch (SVR_VER(svr)) {
case SVR_MPC8533:
case SVR_MPC8533E:
break;
default:
return (ENXIO);
}
device_set_desc(dev, "MPC85xx GPIO driver");
return (0);
}
static int mpc85xx_gpio_detach(device_t dev);
static int
mpc85xx_gpio_attach(device_t dev)
{
struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
int rid;
sc->dev = dev;
GPIO_LOCK_INIT(sc);
/* Allocate memory. */
rid = 0;
sc->out_res = bus_alloc_resource_any(dev,
SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->out_res == NULL) {
device_printf(dev, "Can't allocate memory for device output port");
mpc85xx_gpio_detach(dev);
return (ENOMEM);
}
rid = 1;
sc->in_res = bus_alloc_resource_any(dev,
SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->in_res == NULL) {
device_printf(dev, "Can't allocate memory for device input port");
mpc85xx_gpio_detach(dev);
return (ENOMEM);
}
sc->busdev = gpiobus_attach_bus(dev);
if (sc->busdev == NULL) {
mpc85xx_gpio_detach(dev);
return (ENOMEM);
}
OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
return (0);
}
static int
mpc85xx_gpio_detach(device_t dev)
{
struct mpc85xx_gpio_softc *sc = device_get_softc(dev);
gpiobus_detach_bus(dev);
if (sc->out_res != NULL) {
/* Release output port resource. */
bus_release_resource(dev, SYS_RES_MEMORY,
rman_get_rid(sc->out_res), sc->out_res);
}
if (sc->in_res != NULL) {
/* Release input port resource. */
bus_release_resource(dev, SYS_RES_MEMORY,
rman_get_rid(sc->in_res), sc->in_res);
}
GPIO_LOCK_DESTROY(sc);
return (0);
}
static device_method_t mpc85xx_gpio_methods[] = {
/* device_if */
DEVMETHOD(device_probe, mpc85xx_gpio_probe),
DEVMETHOD(device_attach, mpc85xx_gpio_attach),
DEVMETHOD(device_detach, mpc85xx_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, mpc85xx_gpio_get_bus),
DEVMETHOD(gpio_pin_max, mpc85xx_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, mpc85xx_gpio_pin_getname),
DEVMETHOD(gpio_pin_getcaps, mpc85xx_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_get, mpc85xx_gpio_pin_get),
DEVMETHOD(gpio_pin_set, mpc85xx_gpio_pin_set),
DEVMETHOD(gpio_pin_toggle, mpc85xx_gpio_pin_toggle),
DEVMETHOD_END
};
static driver_t mpc85xx_gpio_driver = {
"gpio",
mpc85xx_gpio_methods,
sizeof(struct mpc85xx_gpio_softc),
};
static devclass_t mpc85xx_gpio_devclass;
EARLY_DRIVER_MODULE(mpc85xx_gpio, simplebus, mpc85xx_gpio_driver,
mpc85xx_gpio_devclass, NULL, NULL,
BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);