162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/*-
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* Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/systm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "fdt_clock_if.h"
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#include <dev/fdt/fdt_clock.h>
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/*
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* Loop through all the tuples in the clocks= property for a device, enabling or
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* disabling each clock.
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*
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* Be liberal about errors for now: warn about a failure to enable but keep
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* trying with any other clocks in the list. Return ENXIO if any errors were
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* found, and let the caller decide whether the problem is fatal.
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*/
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static int
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enable_disable_all(device_t consumer, boolean_t enable)
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{
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phandle_t cnode;
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device_t clockdev;
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int clocknum, err, i, ncells;
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uint32_t *clks;
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boolean_t anyerrors;
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cnode = ofw_bus_get_node(consumer);
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ncells = OF_getencprop_alloc(cnode, "clocks", sizeof(*clks),
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(void **)&clks);
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if (enable && ncells < 2) {
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device_printf(consumer, "Warning: No clocks specified in fdt "
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"data; device may not function.");
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return (ENXIO);
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}
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anyerrors = false;
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for (i = 0; i < ncells; i += 2) {
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clockdev = OF_device_from_xref(clks[i]);
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clocknum = clks[i + 1];
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if (clockdev == NULL) {
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if (enable)
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device_printf(consumer, "Warning: can not find "
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"driver for clock number %u; device may not "
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"function\n", clocknum);
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anyerrors = true;
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continue;
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}
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if (enable)
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err = FDT_CLOCK_ENABLE(clockdev, clocknum);
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else
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err = FDT_CLOCK_DISABLE(clockdev, clocknum);
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if (err != 0) {
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if (enable)
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device_printf(consumer, "Warning: failed to "
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"enable clock number %u; device may not "
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"function\n", clocknum);
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anyerrors = true;
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}
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}
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free(clks, M_OFWPROP);
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return (anyerrors ? ENXIO : 0);
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}
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int
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fdt_clock_get_info(device_t consumer, int n, struct fdt_clock_info *info)
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{
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phandle_t cnode;
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device_t clockdev;
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int clocknum, err, ncells;
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uint32_t *clks;
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cnode = ofw_bus_get_node(consumer);
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ncells = OF_getencprop_alloc(cnode, "clocks", sizeof(*clks),
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(void **)&clks);
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if (ncells <= 0)
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return (ENXIO);
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n *= 2;
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if (ncells <= n)
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err = ENXIO;
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else {
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clockdev = OF_device_from_xref(clks[n]);
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if (clockdev == NULL)
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err = ENXIO;
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else {
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/*
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* Make struct contents minimally valid, then call
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* provider to fill in what it knows (provider can
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* override anything it wants to).
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*/
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clocknum = clks[n + 1];
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bzero(info, sizeof(*info));
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info->provider = clockdev;
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info->index = clocknum;
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info->name = "";
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err = FDT_CLOCK_GET_INFO(clockdev, clocknum, info);
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}
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}
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free(clks, M_OFWPROP);
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return (err);
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}
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int
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fdt_clock_enable_all(device_t consumer)
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{
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return (enable_disable_all(consumer, true));
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}
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int
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fdt_clock_disable_all(device_t consumer)
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{
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return (enable_disable_all(consumer, false));
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}
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void
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fdt_clock_register_provider(device_t provider)
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{
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OF_device_register_xref(OF_xref_from_device(provider), provider);
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}
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void
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fdt_clock_unregister_provider(device_t provider)
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{
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OF_device_register_xref(OF_xref_from_device(provider), NULL);
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}
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