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freebsd-dev/sys/arm/freescale/vybrid/vf_gpio.c
Pedro F. Giffuni af3dc4a7ca sys/arm: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:04:10 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
* 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.
*/
/*
* Vybrid Family General-Purpose Input/Output (GPIO)
* Chapter 7, Vybrid Reference Manual, Rev. 5, 07/2013
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <sys/mutex.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr.h>
#include "gpio_if.h"
#include <arm/freescale/vybrid/vf_common.h>
#include <arm/freescale/vybrid/vf_port.h>
#define GPIO_PDOR(n) (0x00 + 0x40 * (n >> 5))
#define GPIO_PSOR(n) (0x04 + 0x40 * (n >> 5))
#define GPIO_PCOR(n) (0x08 + 0x40 * (n >> 5))
#define GPIO_PTOR(n) (0x0C + 0x40 * (n >> 5))
#define GPIO_PDIR(n) (0x10 + 0x40 * (n >> 5))
#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)
/*
* GPIO interface
*/
static device_t vf_gpio_get_bus(device_t);
static int vf_gpio_pin_max(device_t, int *);
static int vf_gpio_pin_getcaps(device_t, uint32_t, uint32_t *);
static int vf_gpio_pin_getname(device_t, uint32_t, char *);
static int vf_gpio_pin_getflags(device_t, uint32_t, uint32_t *);
static int vf_gpio_pin_setflags(device_t, uint32_t, uint32_t);
static int vf_gpio_pin_set(device_t, uint32_t, unsigned int);
static int vf_gpio_pin_get(device_t, uint32_t, unsigned int *);
static int vf_gpio_pin_toggle(device_t, uint32_t pin);
struct vf_gpio_softc {
struct resource *res[1];
bus_space_tag_t bst;
bus_space_handle_t bsh;
device_t sc_busdev;
struct mtx sc_mtx;
int gpio_npins;
struct gpio_pin gpio_pins[NGPIO];
};
struct vf_gpio_softc *gpio_sc;
static struct resource_spec vf_gpio_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ -1, 0 }
};
static int
vf_gpio_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "fsl,mvf600-gpio"))
return (ENXIO);
device_set_desc(dev, "Vybrid Family GPIO Unit");
return (BUS_PROBE_DEFAULT);
}
static int
vf_gpio_attach(device_t dev)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
if (bus_alloc_resources(dev, vf_gpio_spec, sc->res)) {
device_printf(dev, "could not allocate resources\n");
mtx_destroy(&sc->sc_mtx);
return (ENXIO);
}
/* Memory interface */
sc->bst = rman_get_bustag(sc->res[0]);
sc->bsh = rman_get_bushandle(sc->res[0]);
gpio_sc = sc;
sc->gpio_npins = NGPIO;
for (i = 0; i < sc->gpio_npins; i++) {
sc->gpio_pins[i].gp_pin = i;
sc->gpio_pins[i].gp_caps = DEFAULT_CAPS;
sc->gpio_pins[i].gp_flags =
(READ4(sc, GPIO_PDOR(i)) & (1 << (i % 32))) ?
GPIO_PIN_OUTPUT: GPIO_PIN_INPUT;
snprintf(sc->gpio_pins[i].gp_name, GPIOMAXNAME,
"vf_gpio%d.%d", device_get_unit(dev), i);
}
sc->sc_busdev = gpiobus_attach_bus(dev);
if (sc->sc_busdev == NULL) {
bus_release_resources(dev, vf_gpio_spec, sc->res);
mtx_destroy(&sc->sc_mtx);
return (ENXIO);
}
return (0);
}
static device_t
vf_gpio_get_bus(device_t dev)
{
struct vf_gpio_softc *sc;
sc = device_get_softc(dev);
return (sc->sc_busdev);
}
static int
vf_gpio_pin_max(device_t dev, int *maxpin)
{
*maxpin = NGPIO - 1;
return (0);
}
static int
vf_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
memcpy(name, sc->gpio_pins[i].gp_name, GPIOMAXNAME);
GPIO_UNLOCK(sc);
return (0);
}
static int
vf_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
*caps = sc->gpio_pins[i].gp_caps;
GPIO_UNLOCK(sc);
return (0);
}
static int
vf_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
*flags = sc->gpio_pins[i].gp_flags;
GPIO_UNLOCK(sc);
return (0);
}
static int
vf_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
*val = (READ4(sc, GPIO_PDIR(i)) & (1 << (i % 32))) ? 1 : 0;
GPIO_UNLOCK(sc);
return (0);
}
static int
vf_gpio_pin_toggle(device_t dev, uint32_t pin)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
WRITE4(sc, GPIO_PTOR(i), (1 << (i % 32)));
GPIO_UNLOCK(sc);
return (0);
}
static void
vf_gpio_pin_configure(struct vf_gpio_softc *sc, struct gpio_pin *pin,
unsigned int flags)
{
GPIO_LOCK(sc);
/*
* Manage input/output
*/
if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
if (flags & GPIO_PIN_OUTPUT) {
pin->gp_flags |= GPIO_PIN_OUTPUT;
} else {
pin->gp_flags |= GPIO_PIN_INPUT;
WRITE4(sc, GPIO_PCOR(pin->gp_pin),
(1 << (pin->gp_pin % 32)));
}
}
GPIO_UNLOCK(sc);
}
static int
vf_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
vf_gpio_pin_configure(sc, &sc->gpio_pins[i], flags);
return (0);
}
static int
vf_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
{
struct vf_gpio_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < sc->gpio_npins; i++) {
if (sc->gpio_pins[i].gp_pin == pin)
break;
}
if (i >= sc->gpio_npins)
return (EINVAL);
GPIO_LOCK(sc);
if (value)
WRITE4(sc, GPIO_PSOR(i), (1 << (i % 32)));
else
WRITE4(sc, GPIO_PCOR(i), (1 << (i % 32)));
GPIO_UNLOCK(sc);
return (0);
}
static device_method_t vf_gpio_methods[] = {
DEVMETHOD(device_probe, vf_gpio_probe),
DEVMETHOD(device_attach, vf_gpio_attach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, vf_gpio_get_bus),
DEVMETHOD(gpio_pin_max, vf_gpio_pin_max),
DEVMETHOD(gpio_pin_getname, vf_gpio_pin_getname),
DEVMETHOD(gpio_pin_getcaps, vf_gpio_pin_getcaps),
DEVMETHOD(gpio_pin_getflags, vf_gpio_pin_getflags),
DEVMETHOD(gpio_pin_get, vf_gpio_pin_get),
DEVMETHOD(gpio_pin_toggle, vf_gpio_pin_toggle),
DEVMETHOD(gpio_pin_setflags, vf_gpio_pin_setflags),
DEVMETHOD(gpio_pin_set, vf_gpio_pin_set),
{ 0, 0 }
};
static driver_t vf_gpio_driver = {
"gpio",
vf_gpio_methods,
sizeof(struct vf_gpio_softc),
};
static devclass_t vf_gpio_devclass;
DRIVER_MODULE(vf_gpio, simplebus, vf_gpio_driver, vf_gpio_devclass, 0, 0);
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