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freebsd-skq/sys/dev/gpio/gpiobusvar.h
Ian Lepore 37045806ce Move most of the gpio_pin_* functions from ofw_gpiobus.c to gpiobus.c so 
that they can be used by drivers on non-FDT-configured systems.  Only the
functions related to acquiring pins by parsing FDT data remain in
ofw_gpiobus.  Also, add two new functions for acquiring gpio pins based on
child device_t and index, or on the bus device_t and pin number.  And
finally, defer reserving pins for gpiobus children until they acquire the
pin, rather than reserving them as soon as the child is added (before it's
even known whether the child will attach).

This will allow drivers configured with hints (or any other mechanism) to
use the same code as drivers configured via FDT data.  Until now, a hinted
driver and an FDT driver had to be two completely different sets of code,
because hinted drivers could only use gpiobus calls to manipulate pins,
while fdt-configured drivers could not use that API (due to not always being
children of the bus that owns the pins) and had to use the newer
gpio_pin_xxxx() functions.  Now drivers can be written in the more
traditional form, where most of the code is shared and only the resource
acquisition code at attachment time changes.
2019-12-01 21:27:09 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
* 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.
*
* $FreeBSD$
*
*/
#ifndef __GPIOBUS_H__
#define __GPIOBUS_H__
#include "opt_platform.h"
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#ifdef FDT
#include <dev/ofw/ofw_bus_subr.h>
#endif
#ifdef INTRNG
#include <sys/intr.h>
#endif
#include "gpio_if.h"
#ifdef FDT
#define GPIOBUS_IVAR(d) (struct gpiobus_ivar *) \
&((struct ofw_gpiobus_devinfo *)device_get_ivars(d))->opd_dinfo
#else
#define GPIOBUS_IVAR(d) (struct gpiobus_ivar *) device_get_ivars(d)
#endif
#define GPIOBUS_SOFTC(d) (struct gpiobus_softc *) device_get_softc(d)
#define GPIOBUS_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define GPIOBUS_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define GPIOBUS_LOCK_INIT(_sc) mtx_init(&_sc->sc_mtx, \
device_get_nameunit(_sc->sc_dev), "gpiobus", MTX_DEF)
#define GPIOBUS_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx)
#define GPIOBUS_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED)
#define GPIOBUS_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED)
#define GPIOBUS_WAIT 1
#define GPIOBUS_DONTWAIT 2
/* Use default interrupt mode - for gpio_alloc_intr_resource */
#define GPIO_INTR_CONFORM GPIO_INTR_NONE
struct gpiobus_pin_data
{
int mapped; /* pin is mapped/reserved. */
char *name; /* pin name. */
};
#ifdef INTRNG
struct intr_map_data_gpio {
struct intr_map_data hdr;
u_int gpio_pin_num;
u_int gpio_pin_flags;
u_int gpio_intr_mode;
};
#endif
struct gpiobus_softc
{
struct mtx sc_mtx; /* bus mutex */
struct rman sc_intr_rman; /* isr resources */
device_t sc_busdev; /* bus device */
device_t sc_owner; /* bus owner */
device_t sc_dev; /* driver device */
int sc_npins; /* total pins on bus */
struct gpiobus_pin_data *sc_pins; /* pin data */
};
struct gpiobus_pin
{
device_t dev; /* gpio device */
uint32_t flags; /* pin flags */
uint32_t pin; /* pin number */
};
typedef struct gpiobus_pin *gpio_pin_t;
struct gpiobus_ivar
{
struct resource_list rl; /* isr resource list */
uint32_t npins; /* pins total */
uint32_t *pins; /* pins map */
};
enum gpiobus_ivars {
GPIOBUS_IVAR_NPINS = 10500,
GPIOBUS_IVAR_PINS,
};
#define GPIOBUS_ACCESSOR(var, ivar, type) \
__BUS_ACCESSOR(gpiobus, var, GPIOBUS, ivar, type)
GPIOBUS_ACCESSOR(npins, NPINS, uint32_t)
GPIOBUS_ACCESSOR(pins, PINS, const uint32_t *)
#undef GPIOBUS_ACCESSOR
#ifdef FDT
struct ofw_gpiobus_devinfo {
struct gpiobus_ivar opd_dinfo;
struct ofw_bus_devinfo opd_obdinfo;
};
static __inline int
gpio_map_gpios(device_t bus, phandle_t dev, phandle_t gparent, int gcells,
pcell_t *gpios, uint32_t *pin, uint32_t *flags)
{
return (GPIO_MAP_GPIOS(bus, dev, gparent, gcells, gpios, pin, flags));
}
device_t ofw_gpiobus_add_fdt_child(device_t, const char *, phandle_t);
int ofw_gpiobus_parse_gpios(device_t, char *, struct gpiobus_pin **);
void ofw_gpiobus_register_provider(device_t);
void ofw_gpiobus_unregister_provider(device_t);
/* Acquire a pin by parsing FDT data. */
int gpio_pin_get_by_ofw_name(device_t consumer, phandle_t node,
char *name, gpio_pin_t *gpio);
int gpio_pin_get_by_ofw_idx(device_t consumer, phandle_t node,
int idx, gpio_pin_t *gpio);
int gpio_pin_get_by_ofw_property(device_t consumer, phandle_t node,
char *name, gpio_pin_t *gpio);
int gpio_pin_get_by_ofw_propidx(device_t consumer, phandle_t node,
char *name, int idx, gpio_pin_t *gpio);
#endif /* FDT */
/* Acquire a pin by bus and pin number. */
int gpio_pin_get_by_bus_pinnum(device_t _bus, uint32_t _pinnum, gpio_pin_t *_gp);
/* Acquire a pin by child and index (used by direct children of gpiobus). */
int gpio_pin_get_by_child_index(device_t _child, uint32_t _idx, gpio_pin_t *_gp);
/* Release a pin acquired via any gpio_pin_get_xxx() function. */
void gpio_pin_release(gpio_pin_t gpio);
/* Work with gpio pins acquired using the functions above. */
int gpio_pin_getcaps(gpio_pin_t pin, uint32_t *caps);
int gpio_pin_is_active(gpio_pin_t pin, bool *active);
int gpio_pin_set_active(gpio_pin_t pin, bool active);
int gpio_pin_setflags(gpio_pin_t pin, uint32_t flags);
struct resource *gpio_alloc_intr_resource(device_t consumer_dev, int *rid,
u_int alloc_flags, gpio_pin_t pin, uint32_t intr_mode);
/*
* Functions shared between gpiobus and other bus classes that derive from it;
* these should not be called directly by other drivers.
*/
int gpio_check_flags(uint32_t, uint32_t);
device_t gpiobus_attach_bus(device_t);
int gpiobus_detach_bus(device_t);
int gpiobus_init_softc(device_t);
int gpiobus_alloc_ivars(struct gpiobus_ivar *);
void gpiobus_free_ivars(struct gpiobus_ivar *);
int gpiobus_acquire_pin(device_t, uint32_t);
int gpiobus_release_pin(device_t, uint32_t);
extern driver_t gpiobus_driver;
#endif /* __GPIOBUS_H__ */
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