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 s32 offset;
24 u8 shift;
25 u8 width;
26};
27
28#define _SPRD_DIV_CLK(_offset, _shift, _width) \
29 { \
30 .offset = _offset, \
31 .shift = _shift, \
32 .width = _width, \
33 }
34
35struct sprd_div {
36 struct sprd_div_internal div;
37 struct sprd_clk_common common;
38};
39
40#define SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, _offset, \
41 _shift, _width, _flags, _fn) \
42 struct sprd_div _struct = { \
43 .div = _SPRD_DIV_CLK(_offset, _shift, _width), \
44 .common = { \
45 .regmap = NULL, \
46 .reg = _reg, \
47 .hw.init = _fn(_name, _parent, \
48 &sprd_div_ops, _flags), \
49 } \
50 }
51
52#define SPRD_DIV_CLK(_struct, _name, _parent, _reg, \
53 _shift, _width, _flags) \
54 SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, 0x0, \
55 _shift, _width, _flags, CLK_HW_INIT)
56
57#define SPRD_DIV_CLK_FW_NAME(_struct, _name, _parent, _reg, \
58 _shift, _width, _flags) \
59 SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, 0x0, \
60 _shift, _width, _flags, CLK_HW_INIT_FW_NAME)
61
62#define SPRD_DIV_CLK_HW(_struct, _name, _parent, _reg, \
63 _shift, _width, _flags) \
64 SPRD_DIV_CLK_HW_INIT_FN(_struct, _name, _parent, _reg, 0x0, \
65 _shift, _width, _flags, CLK_HW_INIT_HW)
66
67static inline struct sprd_div *hw_to_sprd_div(const struct clk_hw *hw)
68{
69 struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
70
71 return container_of(common, struct sprd_div, common);
72}
73
74unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common,
75 const struct sprd_div_internal *div,
76 unsigned long parent_rate);
77
78int sprd_div_helper_set_rate(const struct sprd_clk_common *common,
79 const struct sprd_div_internal *div,
80 unsigned long rate,
81 unsigned long parent_rate);
82
83extern const struct clk_ops sprd_div_ops;
84
85#endif /* _SPRD_DIV_H_ */
86

source code of linux/drivers/clk/sprd/div.h