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-divider.h"
20
21static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw)
22{
23	return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);
24}
25
26static long div_round_rate(struct clk_hw *hw, unsigned long rate,
27			   unsigned long *prate)
28{
29	struct clk_regmap_div *divider = to_clk_regmap_div(hw);
30
31	return divider_round_rate(hw, rate, prate, NULL, divider->width,
32				  CLK_DIVIDER_ROUND_CLOSEST);
33}
34
35static int div_set_rate(struct clk_hw *hw, unsigned long rate,
36			unsigned long parent_rate)
37{
38	struct clk_regmap_div *divider = to_clk_regmap_div(hw);
39	struct clk_regmap *clkr = &divider->clkr;
40	u32 div;
41
42	div = divider_get_val(rate, parent_rate, NULL, divider->width,
43			      CLK_DIVIDER_ROUND_CLOSEST);
44
45	return regmap_update_bits(clkr->regmap, divider->reg,
46				  (BIT(divider->width) - 1) << divider->shift,
47				  div << divider->shift);
48}
49
50static unsigned long div_recalc_rate(struct clk_hw *hw,
51				     unsigned long parent_rate)
52{
53	struct clk_regmap_div *divider = to_clk_regmap_div(hw);
54	struct clk_regmap *clkr = &divider->clkr;
55	u32 div;
56
57	regmap_read(clkr->regmap, divider->reg, &div);
58	div >>= divider->shift;
59	div &= BIT(divider->width) - 1;
60
61	return divider_recalc_rate(hw, parent_rate, div, NULL,
62				   CLK_DIVIDER_ROUND_CLOSEST);
63}
64
65const struct clk_ops clk_regmap_div_ops = {
66	.round_rate = div_round_rate,
67	.set_rate = div_set_rate,
68	.recalc_rate = div_recalc_rate,
69};
70EXPORT_SYMBOL_GPL(clk_regmap_div_ops);
71