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#include <linux/clk-provider.h>
9
10#include "div.h"
11
12static long sprd_div_round_rate(struct clk_hw *hw, unsigned long rate,
13 unsigned long *parent_rate)
14{
15 struct sprd_div *cd = hw_to_sprd_div(hw);
16
17 return divider_round_rate(hw: &cd->common.hw, rate, prate: parent_rate, NULL,
18 width: cd->div.width, flags: 0);
19}
20
21unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common,
22 const struct sprd_div_internal *div,
23 unsigned long parent_rate)
24{
25 unsigned long val;
26 unsigned int reg;
27
28 regmap_read(map: common->regmap, reg: common->reg + div->offset, val: &reg);
29 val = reg >> div->shift;
30 val &= (1 << div->width) - 1;
31
32 return divider_recalc_rate(hw: &common->hw, parent_rate, val, NULL, flags: 0,
33 width: div->width);
34}
35EXPORT_SYMBOL_GPL(sprd_div_helper_recalc_rate);
36
37static unsigned long sprd_div_recalc_rate(struct clk_hw *hw,
38 unsigned long parent_rate)
39{
40 struct sprd_div *cd = hw_to_sprd_div(hw);
41
42 return sprd_div_helper_recalc_rate(&cd->common, &cd->div, parent_rate);
43}
44
45int sprd_div_helper_set_rate(const struct sprd_clk_common *common,
46 const struct sprd_div_internal *div,
47 unsigned long rate,
48 unsigned long parent_rate)
49{
50 unsigned long val;
51 unsigned int reg;
52
53 val = divider_get_val(rate, parent_rate, NULL,
54 width: div->width, flags: 0);
55
56 regmap_read(map: common->regmap, reg: common->reg + div->offset, val: &reg);
57 reg &= ~GENMASK(div->width + div->shift - 1, div->shift);
58
59 regmap_write(map: common->regmap, reg: common->reg + div->offset,
60 val: reg | (val << div->shift));
61
62 return 0;
63
64}
65EXPORT_SYMBOL_GPL(sprd_div_helper_set_rate);
66
67static int sprd_div_set_rate(struct clk_hw *hw, unsigned long rate,
68 unsigned long parent_rate)
69{
70 struct sprd_div *cd = hw_to_sprd_div(hw);
71
72 return sprd_div_helper_set_rate(&cd->common, &cd->div,
73 rate, parent_rate);
74}
75
76const struct clk_ops sprd_div_ops = {
77 .recalc_rate = sprd_div_recalc_rate,
78 .round_rate = sprd_div_round_rate,
79 .set_rate = sprd_div_set_rate,
80};
81EXPORT_SYMBOL_GPL(sprd_div_ops);
82

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