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(&cd->common.hw, rate, parent_rate, NULL,
18				  cd->div.width, 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(common->regmap, common->reg + div->offset, &reg);
29	val = reg >> div->shift;
30	val &= (1 << div->width) - 1;
31
32	return divider_recalc_rate(&common->hw, parent_rate, val, NULL, 0,
33				   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			      div->width, 0);
55
56	regmap_read(common->regmap, common->reg + div->offset, &reg);
57	reg &= ~GENMASK(div->width + div->shift - 1, div->shift);
58
59	regmap_write(common->regmap, common->reg + div->offset,
60			  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