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fcaf2036 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a49e6c4b LY |
2 | /* |
3 | * Copyright (C) 2013 Freescale Semiconductor, Inc. | |
a49e6c4b LY |
4 | */ |
5 | ||
6 | #include <linux/clk-provider.h> | |
7 | #include <linux/err.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/slab.h> | |
10 | #include "clk.h" | |
11 | ||
a49e6c4b LY |
12 | /** |
13 | * struct clk_fixup_mux - imx integer fixup multiplexer clock | |
14 | * @mux: the parent class | |
15 | * @ops: pointer to clk_ops of parent class | |
16 | * @fixup: a hook to fixup the write value | |
17 | * | |
18 | * The imx fixup multiplexer clock is a subclass of basic clk_mux | |
19 | * with an addtional fixup hook. | |
20 | */ | |
21 | struct clk_fixup_mux { | |
22 | struct clk_mux mux; | |
23 | const struct clk_ops *ops; | |
24 | void (*fixup)(u32 *val); | |
25 | }; | |
26 | ||
27 | static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw) | |
28 | { | |
29 | struct clk_mux *mux = to_clk_mux(hw); | |
30 | ||
31 | return container_of(mux, struct clk_fixup_mux, mux); | |
32 | } | |
33 | ||
34 | static u8 clk_fixup_mux_get_parent(struct clk_hw *hw) | |
35 | { | |
36 | struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); | |
37 | ||
38 | return fixup_mux->ops->get_parent(&fixup_mux->mux.hw); | |
39 | } | |
40 | ||
41 | static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index) | |
42 | { | |
43 | struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); | |
44 | struct clk_mux *mux = to_clk_mux(hw); | |
45 | unsigned long flags = 0; | |
46 | u32 val; | |
47 | ||
48 | spin_lock_irqsave(mux->lock, flags); | |
49 | ||
50 | val = readl(mux->reg); | |
51 | val &= ~(mux->mask << mux->shift); | |
52 | val |= index << mux->shift; | |
53 | fixup_mux->fixup(&val); | |
54 | writel(val, mux->reg); | |
55 | ||
56 | spin_unlock_irqrestore(mux->lock, flags); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | static const struct clk_ops clk_fixup_mux_ops = { | |
62 | .get_parent = clk_fixup_mux_get_parent, | |
63 | .set_parent = clk_fixup_mux_set_parent, | |
64 | }; | |
65 | ||
66 | struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg, | |
9e5ef7a5 | 67 | u8 shift, u8 width, const char * const *parents, |
a49e6c4b LY |
68 | int num_parents, void (*fixup)(u32 *val)) |
69 | { | |
70 | struct clk_fixup_mux *fixup_mux; | |
71 | struct clk *clk; | |
72 | struct clk_init_data init; | |
73 | ||
74 | if (!fixup) | |
75 | return ERR_PTR(-EINVAL); | |
76 | ||
77 | fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL); | |
78 | if (!fixup_mux) | |
79 | return ERR_PTR(-ENOMEM); | |
80 | ||
81 | init.name = name; | |
82 | init.ops = &clk_fixup_mux_ops; | |
83 | init.parent_names = parents; | |
84 | init.num_parents = num_parents; | |
bdb1b5f2 | 85 | init.flags = 0; |
a49e6c4b LY |
86 | |
87 | fixup_mux->mux.reg = reg; | |
88 | fixup_mux->mux.shift = shift; | |
89 | fixup_mux->mux.mask = BIT(width) - 1; | |
90 | fixup_mux->mux.lock = &imx_ccm_lock; | |
91 | fixup_mux->mux.hw.init = &init; | |
92 | fixup_mux->ops = &clk_mux_ops; | |
93 | fixup_mux->fixup = fixup; | |
94 | ||
95 | clk = clk_register(NULL, &fixup_mux->mux.hw); | |
96 | if (IS_ERR(clk)) | |
97 | kfree(fixup_mux); | |
98 | ||
99 | return clk; | |
100 | } |