99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
/****************************************************************************
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* drivers/clk/clk_fixed_factor.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/clk/clk.h>
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#include <nuttx/clk/clk_provider.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define to_clk_fixed_factor(_clk) (FAR struct clk_fixed_factor_s *) \
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(_clk->private_data)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static uint32_t clk_factor_recalc_rate(FAR struct clk_s *clk,
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uint32_t parent_rate)
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{
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FAR struct clk_fixed_factor_s *fixed = to_clk_fixed_factor(clk);
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uint64_t rate = parent_rate;
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rate *= fixed->mult;
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rate /= fixed->div;
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return rate;
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}
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static uint32_t clk_factor_round_rate(FAR struct clk_s *clk,
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uint32_t rate,
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FAR uint32_t *prate)
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{
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FAR struct clk_fixed_factor_s *fixed = to_clk_fixed_factor(clk);
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if (clk->flags & CLK_SET_RATE_PARENT)
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{
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uint32_t best_parent;
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best_parent = ((uint64_t)rate * fixed->div) / fixed->mult;
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*prate = clk_round_rate(clk_get_parent(clk), best_parent);
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}
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return ((uint64_t)*prate * fixed->mult) / fixed->div;
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}
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/****************************************************************************
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* Public Data
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****************************************************************************/
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const struct clk_ops_s g_clk_fixed_factor_ops =
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{
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.round_rate = clk_factor_round_rate,
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.recalc_rate = clk_factor_recalc_rate,
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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FAR struct clk_s *clk_register_fixed_factor(FAR const char *name,
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FAR const char *parent_name,
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uint8_t flags, uint8_t mult,
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uint8_t div)
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{
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struct clk_fixed_factor_s fixed;
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FAR const char **parent_names;
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uint8_t num_parents;
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parent_names = parent_name ? &parent_name : NULL;
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num_parents = parent_name ? 1 : 0;
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fixed.mult = mult;
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fixed.div = div;
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return clk_register(name, parent_names, num_parents, flags,
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&g_clk_fixed_factor_ops, &fixed, sizeof(fixed));
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}
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