freebsd-dev/sys/powerpc/mpc85xx/qoriq_gpio.c
Justin Hibbits 68a71d75c2 Add Freescale QorIQ GPIO driver.
Still missing interrupt support, to come later.

Sponsored by:	Alex Perez/Inertial Computing
2015-11-30 02:23:56 +00:00

310 lines
7.2 KiB
C

/*-
* Copyright (c) 2015 Justin Hibbits
* 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/mutex.h>
#include <sys/rman.h>
#include <sys/gpio.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/stdarg.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 (31)
#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);
#define GPIO_GPDIR 0x0
#define GPIO_GPODR 0x4
#define GPIO_GPDAT 0x8
#define GPIO_GPIER 0xc
#define GPIO_GPIMR 0x10
#define GPIO_GPICR 0x14
struct qoriq_gpio_softc {
device_t dev;
device_t busdev;
struct mtx sc_mtx;
struct resource *sc_mem; /* Memory resource */
};
static device_t
qoriq_gpio_get_bus(device_t dev)
{
struct qoriq_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->busdev);
}
static int
qoriq_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = MAXPIN;
return (0);
}
/* Get a specific pin's capabilities. */
static int
qoriq_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 | GPIO_PIN_OPENDRAIN);
return (0);
}
/* Get a specific pin's name. */
static int
qoriq_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
if (!VALID_PIN(pin))
return (EINVAL);
snprintf(name, GPIOMAXNAME, "qoriq_gpio%d.%d",
device_get_unit(dev), pin);
name[GPIOMAXNAME-1] = '\0';
return (0);
}
/* Set flags for the pin. */
static int
qoriq_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct qoriq_gpio_softc *sc = device_get_softc(dev);
uint32_t reg;
if (!VALID_PIN(pin))
return (EINVAL);
if ((flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) ==
(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT))
return (EINVAL);
GPIO_LOCK(sc);
if (flags & GPIO_PIN_INPUT) {
reg = bus_read_4(sc->sc_mem, GPIO_GPDIR);
reg &= ~(1 << (31 - pin));
bus_write_4(sc->sc_mem, GPIO_GPDIR, reg);
}
else if (flags & GPIO_PIN_OUTPUT) {
reg = bus_read_4(sc->sc_mem, GPIO_GPDIR);
reg |= (1 << (31 - pin));
bus_write_4(sc->sc_mem, GPIO_GPDIR, reg);
reg = bus_read_4(sc->sc_mem, GPIO_GPODR);
if (flags & GPIO_PIN_OPENDRAIN)
reg |= (1 << (31 - pin));
else
reg &= ~(1 << (31 - pin));
bus_write_4(sc->sc_mem, GPIO_GPODR, reg);
}
GPIO_UNLOCK(sc);
return (0);
}
/* Set a specific output pin's value. */
static int
qoriq_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct qoriq_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->sc_mem, GPIO_GPDAT);
outvals &= ~(1 << pinbit);
outvals |= (value << pinbit);
bus_write_4(sc->sc_mem, 0, outvals);
GPIO_UNLOCK(sc);
return (0);
}
/* Get a specific pin's input value. */
static int
qoriq_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
{
struct qoriq_gpio_softc *sc = device_get_softc(dev);
if (!VALID_PIN(pin))
return (EINVAL);
*value = (bus_read_4(sc->sc_mem, GPIO_GPDAT) >> (31 - pin)) & 1;
return (0);
}
/* Toggle a pin's output value. */
static int
qoriq_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct qoriq_gpio_softc *sc = device_get_softc(dev);
uint32_t val;
if (!VALID_PIN(pin))
return (EINVAL);
GPIO_LOCK(sc);
val = bus_read_4(sc->sc_mem, GPIO_GPDAT);
val ^= (1 << (31 - pin));
bus_write_4(sc->sc_mem, 0, val);
GPIO_UNLOCK(sc);
return (0);
}
static int
qoriq_gpio_probe(device_t dev)
{
if (!ofw_bus_is_compatible(dev, "fsl,qoriq-gpio"))
return (ENXIO);
device_set_desc(dev, "Freescale QorIQ GPIO driver");
return (0);
}
static int qoriq_gpio_detach(device_t dev);
static int
qoriq_gpio_attach(device_t dev)
{
struct qoriq_gpio_softc *sc = device_get_softc(dev);
int rid;
sc->dev = dev;
GPIO_LOCK_INIT(sc);
/* Allocate memory. */
rid = 0;
sc->sc_mem = bus_alloc_resource_any(dev,
SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->sc_mem == NULL) {
device_printf(dev, "Can't allocate memory for device output port");
qoriq_gpio_detach(dev);
return (ENOMEM);
}
sc->busdev = gpiobus_attach_bus(dev);
if (sc->busdev == NULL) {
qoriq_gpio_detach(dev);
return (ENOMEM);
}
OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
return (0);
}
static int
qoriq_gpio_detach(device_t dev)
{
struct qoriq_gpio_softc *sc = device_get_softc(dev);
gpiobus_detach_bus(dev);
if (sc->sc_mem != NULL) {
/* Release output port resource. */
bus_release_resource(dev, SYS_RES_MEMORY,
rman_get_rid(sc->sc_mem), sc->sc_mem);
}
GPIO_LOCK_DESTROY(sc);
return (0);
}
static device_method_t qoriq_gpio_methods[] = {
/* device_if */
DEVMETHOD(device_probe, qoriq_gpio_probe),
DEVMETHOD(device_attach, qoriq_gpio_attach),
DEVMETHOD(device_detach, qoriq_gpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, qoriq_gpio_get_bus),
DEVMETHOD(gpio_pin_max, qoriq_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, qoriq_gpio_pin_getname),
DEVMETHOD(gpio_pin_getcaps, qoriq_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_get, qoriq_gpio_pin_get),
DEVMETHOD(gpio_pin_set, qoriq_gpio_pin_set),
DEVMETHOD(gpio_pin_setflags, qoriq_gpio_pin_setflags),
DEVMETHOD(gpio_pin_toggle, qoriq_gpio_pin_toggle),
DEVMETHOD_END
};
static driver_t qoriq_gpio_driver = {
"gpio",
qoriq_gpio_methods,
sizeof(struct qoriq_gpio_softc),
};
static devclass_t qoriq_gpio_devclass;
EARLY_DRIVER_MODULE(qoriq_gpio, simplebus, qoriq_gpio_driver,
qoriq_gpio_devclass, NULL, NULL,
BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);