1// SPDX-License-Identifier: GPL-2.0
2//
3// Spreadtrum multiplexer clock driver
4//
5// Copyright (C) 2017 Spreadtrum, Inc.
6// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
7
8#include <linux/clk.h>
9#include <linux/clk-provider.h>
10#include <linux/regmap.h>
11
12#include "mux.h"
13
14u8 sprd_mux_helper_get_parent(const struct sprd_clk_common *common,
15 const struct sprd_mux_ssel *mux)
16{
17 unsigned int reg;
18 u8 parent;
19 int num_parents;
20 int i;
21
22 regmap_read(map: common->regmap, reg: common->reg, val: &reg);
23 parent = reg >> mux->shift;
24 parent &= (1 << mux->width) - 1;
25
26 if (!mux->table)
27 return parent;
28
29 num_parents = clk_hw_get_num_parents(hw: &common->hw);
30
31 for (i = 0; i < num_parents - 1; i++)
32 if (parent >= mux->table[i] && parent < mux->table[i + 1])
33 return i;
34
35 return num_parents - 1;
36}
37EXPORT_SYMBOL_GPL(sprd_mux_helper_get_parent);
38
39static u8 sprd_mux_get_parent(struct clk_hw *hw)
40{
41 struct sprd_mux *cm = hw_to_sprd_mux(hw);
42
43 return sprd_mux_helper_get_parent(&cm->common, &cm->mux);
44}
45
46int sprd_mux_helper_set_parent(const struct sprd_clk_common *common,
47 const struct sprd_mux_ssel *mux,
48 u8 index)
49{
50 unsigned int reg;
51
52 if (mux->table)
53 index = mux->table[index];
54
55 regmap_read(map: common->regmap, reg: common->reg, val: &reg);
56 reg &= ~GENMASK(mux->width + mux->shift - 1, mux->shift);
57 regmap_write(map: common->regmap, reg: common->reg,
58 val: reg | (index << mux->shift));
59
60 return 0;
61}
62EXPORT_SYMBOL_GPL(sprd_mux_helper_set_parent);
63
64static int sprd_mux_set_parent(struct clk_hw *hw, u8 index)
65{
66 struct sprd_mux *cm = hw_to_sprd_mux(hw);
67
68 return sprd_mux_helper_set_parent(&cm->common, &cm->mux, index);
69}
70
71const struct clk_ops sprd_mux_ops = {
72 .get_parent = sprd_mux_get_parent,
73 .set_parent = sprd_mux_set_parent,
74 .determine_rate = __clk_mux_determine_rate,
75};
76EXPORT_SYMBOL_GPL(sprd_mux_ops);
77

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