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/* $NetBSD: fdt_syscon.c,v 1.3 2018/06/30 20:16:56 jmcneill Exp $ */
/*-
* Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca>
* 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>
__KERNEL_RCSID(0, "$NetBSD: fdt_syscon.c,v 1.3 2018/06/30 20:16:56 jmcneill Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <sys/queue.h>
#include <libfdt.h>
#include <dev/fdt/fdtvar.h>
struct syscon;
struct fdtbus_syscon {
device_t sc_dev;
int sc_phandle;
struct syscon *sc_syscon;
LIST_ENTRY(fdtbus_syscon) sc_next;
};
static LIST_HEAD(, fdtbus_syscon) fdtbus_syscons =
LIST_HEAD_INITIALIZER(fdtbus_syscons);
int
fdtbus_register_syscon(device_t dev, int phandle,
struct syscon *syscon)
{
struct fdtbus_syscon *sc;
sc = kmem_alloc(sizeof(*sc), KM_SLEEP);
sc->sc_dev = dev;
sc->sc_phandle = phandle;
sc->sc_syscon = syscon;
LIST_INSERT_HEAD(&fdtbus_syscons, sc, sc_next);
return 0;
}
static struct fdtbus_syscon *
fdtbus_get_syscon(int phandle)
{
struct fdtbus_syscon *sc;
LIST_FOREACH(sc, &fdtbus_syscons, sc_next) {
if (sc->sc_phandle == phandle)
return sc;
}
return NULL;
}
struct syscon *
fdtbus_syscon_acquire(int phandle, const char *prop)
{
struct fdtbus_syscon *sc;
int sc_phandle;
sc_phandle = fdtbus_get_phandle(phandle, prop);
if (sc_phandle < 0)
return NULL;
sc = fdtbus_get_syscon(sc_phandle);
if (sc == NULL)
return NULL;
return sc->sc_syscon;
}
struct syscon *
fdtbus_syscon_lookup(int phandle)
{
struct fdtbus_syscon *sc;
sc = fdtbus_get_syscon(phandle);
if (sc == NULL)
return NULL;
return sc->sc_syscon;
}
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