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 */ 22 struct 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 33 struct 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 60 static 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 67 unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common, 68 const struct sprd_div_internal *div, 69 unsigned long parent_rate); 70 71 int sprd_div_helper_set_rate(const struct sprd_clk_common *common, 72 const struct sprd_div_internal *div, 73 unsigned long rate, 74 unsigned long parent_rate); 75 76 extern const struct clk_ops sprd_div_ops; 77 78 #endif /* _SPRD_DIV_H_ */ 79