freebsd-dev/sys/mips/mediatek/fdt_reset.c
Oleksandr Tymoshenko 68dd3f144c Use OF_prop_free instead of direct call to free(9)
Reviewed by:	sgalabov
2016-05-14 20:05:35 +00:00

126 lines
3.6 KiB
C

/*-
* Copyright (c) 2016 Stanislav Galabov
* Copyright (c) 2014 Ian Lepore <ian@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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "fdt_reset_if.h"
#include <mips/mediatek/fdt_reset.h>
/*
* Loop through all the tuples in the resets= property for a device, asserting
* or deasserting each reset.
*
* Be liberal about errors for now: warn about a failure to (de)assert but keep
* trying with any other resets in the list. Return ENXIO if any errors were
* found, and let the caller decide whether the problem is fatal.
*/
static int
assert_deassert_all(device_t consumer, boolean_t assert)
{
phandle_t rnode;
device_t resetdev;
int resetnum, err, i, ncells;
uint32_t *resets;
boolean_t anyerrors;
rnode = ofw_bus_get_node(consumer);
ncells = OF_getencprop_alloc(rnode, "resets", sizeof(*resets),
(void **)&resets);
if (!assert && ncells < 2) {
device_printf(consumer, "Warning: No resets specified in fdt "
"data; device may not function.");
return (ENXIO);
}
anyerrors = false;
for (i = 0; i < ncells; i += 2) {
resetdev = OF_device_from_xref(resets[i]);
resetnum = resets[i + 1];
if (resetdev == NULL) {
if (!assert)
device_printf(consumer, "Warning: can not find "
"driver for reset number %u; device may "
"not function\n", resetnum);
anyerrors = true;
continue;
}
if (assert)
err = FDT_RESET_ASSERT(resetdev, resetnum);
else
err = FDT_RESET_DEASSERT(resetdev, resetnum);
if (err != 0) {
if (!assert)
device_printf(consumer, "Warning: failed to "
"deassert reset number %u; device may not "
"function\n", resetnum);
anyerrors = true;
}
}
OF_prop_free(resets);
return (anyerrors ? ENXIO : 0);
}
int
fdt_reset_assert_all(device_t consumer)
{
return (assert_deassert_all(consumer, true));
}
int
fdt_reset_deassert_all(device_t consumer)
{
return (assert_deassert_all(consumer, false));
}
void
fdt_reset_register_provider(device_t provider)
{
OF_device_register_xref(
OF_xref_from_node(ofw_bus_get_node(provider)), provider);
}
void
fdt_reset_unregister_provider(device_t provider)
{
OF_device_register_xref(OF_xref_from_device(provider), NULL);
}