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 | |
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(map: mux->regmap, AT91_SFR_I2SCLKSEL, val: &val); |
33 | |
34 | return (val & BIT(mux->bus_id)) >> mux->bus_id; |
35 | } |
36 | |
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(map: mux->regmap, AT91_SFR_I2SCLKSEL, |
42 | BIT(mux->bus_id), val: 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 |
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(size: sizeof(*i2s_ck), GFP_KERNEL); |
61 | if (!i2s_ck) |
62 | return ERR_PTR(error: -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, hw: &i2s_ck->hw); |
74 | if (ret) { |
75 | kfree(objp: i2s_ck); |
76 | return ERR_PTR(error: ret); |
77 | } |
78 | |
79 | return &i2s_ck->hw; |
80 | } |
81 | |