1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2018 Microchip Technology Inc,
4 * Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
5 *
6 *
7 */
8
9 #include <linux/clk-provider.h>
10 #include <linux/of.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/regmap.h>
13 #include <linux/slab.h>
14
15 #include <soc/at91/atmel-sfr.h>
16
17 #include "pmc.h"
18
19 struct clk_i2s_mux {
20 struct clk_hw hw;
21 struct regmap *regmap;
22 u8 bus_id;
23 };
24
25 #define to_clk_i2s_mux(hw) container_of(hw, struct clk_i2s_mux, hw)
26
clk_i2s_mux_get_parent(struct clk_hw * hw)27 static u8 clk_i2s_mux_get_parent(struct clk_hw *hw)
28 {
29 struct clk_i2s_mux *mux = to_clk_i2s_mux(hw);
30 u32 val;
31
32 regmap_read(mux->regmap, AT91_SFR_I2SCLKSEL, &val);
33
34 return (val & BIT(mux->bus_id)) >> mux->bus_id;
35 }
36
clk_i2s_mux_set_parent(struct clk_hw * hw,u8 index)37 static int clk_i2s_mux_set_parent(struct clk_hw *hw, u8 index)
38 {
39 struct clk_i2s_mux *mux = to_clk_i2s_mux(hw);
40
41 return regmap_update_bits(mux->regmap, AT91_SFR_I2SCLKSEL,
42 BIT(mux->bus_id), index << mux->bus_id);
43 }
44
45 static const struct clk_ops clk_i2s_mux_ops = {
46 .get_parent = clk_i2s_mux_get_parent,
47 .set_parent = clk_i2s_mux_set_parent,
48 .determine_rate = __clk_mux_determine_rate,
49 };
50
51 struct clk_hw * __init
at91_clk_i2s_mux_register(struct regmap * regmap,const char * name,const char * const * parent_names,unsigned int num_parents,u8 bus_id)52 at91_clk_i2s_mux_register(struct regmap *regmap, const char *name,
53 const char * const *parent_names,
54 unsigned int num_parents, u8 bus_id)
55 {
56 struct clk_init_data init = {};
57 struct clk_i2s_mux *i2s_ck;
58 int ret;
59
60 i2s_ck = kzalloc(sizeof(*i2s_ck), GFP_KERNEL);
61 if (!i2s_ck)
62 return ERR_PTR(-ENOMEM);
63
64 init.name = name;
65 init.ops = &clk_i2s_mux_ops;
66 init.parent_names = parent_names;
67 init.num_parents = num_parents;
68
69 i2s_ck->hw.init = &init;
70 i2s_ck->bus_id = bus_id;
71 i2s_ck->regmap = regmap;
72
73 ret = clk_hw_register(NULL, &i2s_ck->hw);
74 if (ret) {
75 kfree(i2s_ck);
76 return ERR_PTR(ret);
77 }
78
79 return &i2s_ck->hw;
80 }
81