div.h (2272B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2// 3// Spreadtrum divider clock driver 4// 5// Copyright (C) 2017 Spreadtrum, Inc. 6// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com> 7 8#ifndef _SPRD_DIV_H_ 9#define _SPRD_DIV_H_ 10 11#include "common.h" 12 13/** 14 * struct sprd_div_internal - Internal divider description 15 * @shift: Bit offset of the divider in its register 16 * @width: Width of the divider field in its register 17 * 18 * That structure represents a single divider, and is meant to be 19 * embedded in other structures representing the various clock 20 * classes. 21 */ 22struct sprd_div_internal { 23 u8 shift; 24 u8 width; 25}; 26 27#define _SPRD_DIV_CLK(_shift, _width) \ 28 { \ 29 .shift = _shift, \ 30 .width = _width, \ 31 } 32 33struct sprd_div { 34 struct sprd_div_internal div; 35 struct sprd_clk_common common; 36}; 37 38#define SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, \ 39 _shift, _width, _flags, _fn) \ 40 struct sprd_div _struct = { \ 41 .div = _SPRD_DIV_CLK(_shift, _width), \ 42 .common = { \ 43 .regmap = NULL, \ 44 .reg = _reg, \ 45 .hw.init = _fn(_name, _parent, \ 46 &sprd_div_ops, _flags), \ 47 } \ 48 } 49 50#define SPRD_DIV_CLK(_struct, _name, _parent, _reg, \ 51 _shift, _width, _flags) \ 52 SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, \ 53 _shift, _width, _flags, CLK_HW_INIT) 54 55#define SPRD_DIV_CLK_HW(_struct, _name, _parent, _reg, \ 56 _shift, _width, _flags) \ 57 SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, \ 58 _shift, _width, _flags, CLK_HW_INIT_HW) 59 60static inline struct sprd_div *hw_to_sprd_div(const struct clk_hw *hw) 61{ 62 struct sprd_clk_common *common = hw_to_sprd_clk_common(hw); 63 64 return container_of(common, struct sprd_div, common); 65} 66 67long sprd_div_helper_round_rate(struct sprd_clk_common *common, 68 const struct sprd_div_internal *div, 69 unsigned long rate, 70 unsigned long *parent_rate); 71 72unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common, 73 const struct sprd_div_internal *div, 74 unsigned long parent_rate); 75 76int sprd_div_helper_set_rate(const struct sprd_clk_common *common, 77 const struct sprd_div_internal *div, 78 unsigned long rate, 79 unsigned long parent_rate); 80 81extern const struct clk_ops sprd_div_ops; 82 83#endif /* _SPRD_DIV_H_ */