1/*
 2 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 3 *
 4 * This software is licensed under the terms of the GNU General Public
 5 * License version 2, as published by the Free Software Foundation, and
 6 * may be copied, distributed, and modified under those terms.
 7 *
 8 * This program is distributed in the hope that it will be useful,
 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/kernel.h>
15#include <linux/bitops.h>
16#include <linux/regmap.h>
17#include <linux/export.h>
18
19#include "clk-regmap-mux.h"
20
21static inline struct clk_regmap_mux *to_clk_regmap_mux(struct clk_hw *hw)
22{
23	return container_of(to_clk_regmap(hw), struct clk_regmap_mux, clkr);
24}
25
26static u8 mux_get_parent(struct clk_hw *hw)
27{
28	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
29	struct clk_regmap *clkr = to_clk_regmap(hw);
30	unsigned int mask = GENMASK(mux->width - 1, 0);
31	unsigned int val;
32
33	regmap_read(clkr->regmap, mux->reg, &val);
34
35	val >>= mux->shift;
36	val &= mask;
37
38	return val;
39}
40
41static int mux_set_parent(struct clk_hw *hw, u8 index)
42{
43	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
44	struct clk_regmap *clkr = to_clk_regmap(hw);
45	unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
46	unsigned int val;
47
48	val = index;
49	val <<= mux->shift;
50
51	return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
52}
53
54const struct clk_ops clk_regmap_mux_closest_ops = {
55	.get_parent = mux_get_parent,
56	.set_parent = mux_set_parent,
57	.determine_rate = __clk_mux_determine_rate_closest,
58};
59EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);