117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/****************************************************************************
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* drivers/clk/clk.h
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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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#ifndef __DRIVER_CLK_CLK_H
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#define __DRIVER_CLK_CLK_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <strings.h>
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#ifdef CONFIG_CLK
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define BIT(nr) (1ULL << (nr))
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#define MASK(width) (BIT(width) - 1)
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#define MULT_ROUND_UP(r, m) ((r) * (m) + (m) - 1)
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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#define DIV_ROUND_CLOSEST(n, d) ((((n) < 0) ^ ((d) < 0)) ? \
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(((n) - (d)/2)/(d)) : (((n) + (d)/2)/(d)))
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#define MIN(x, y) (x < y) ? x : y
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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static inline void clk_write(uint32_t reg, uint32_t value)
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{
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reg = reg / (CHAR_BIT / 8);
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*((volatile uint32_t *) (reg)) = value;
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}
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static inline uint32_t clk_read(uint32_t reg)
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{
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reg = reg / (CHAR_BIT / 8);
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return *((volatile uint32_t *) (reg));
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}
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static inline uint32_t gcd(uint32_t a, uint32_t b)
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{
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uint32_t r;
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uint32_t tmp;
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if (a < b)
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{
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tmp = a;
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a = b;
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b = tmp;
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}
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if (!b)
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{
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return a;
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}
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while ((r = a % b) != 0)
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{
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a = b;
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b = r;
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}
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return b;
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}
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static inline int is_power_of_2(uint32_t n)
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{
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return (n != 0 && ((n & (n - 1)) == 0));
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}
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static inline uint32_t roundup_pow_of_two(uint32_t n)
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{
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return 1 << fls(n - 1);
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}
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static inline uint32_t rounddown_pow_of_two(uint32_t n)
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{
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return 1 << (fls(n) - 1);
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}
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static inline uint32_t roundup_double(double n)
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{
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uint32_t intn = (uint32_t)n;
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if (n == (double)intn)
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{
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return intn;
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}
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return intn + 1;
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}
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#endif /* CONFIG_CLK */
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#endif /* __DRIVER_CLK_CLK_H */
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