1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2013 Freescale Semiconductor, Inc. |
4 | */ |
5 | |
6 | #include <linux/bits.h> |
7 | #include <linux/clk-provider.h> |
8 | #include <linux/err.h> |
9 | #include <linux/io.h> |
10 | #include <linux/slab.h> |
11 | #include "clk.h" |
12 | |
13 | /** |
14 | * struct clk_fixup_mux - imx integer fixup multiplexer clock |
15 | * @mux: the parent class |
16 | * @ops: pointer to clk_ops of parent class |
17 | * @fixup: a hook to fixup the write value |
18 | * |
19 | * The imx fixup multiplexer clock is a subclass of basic clk_mux |
20 | * with an addtional fixup hook. |
21 | */ |
22 | struct clk_fixup_mux { |
23 | struct clk_mux mux; |
24 | const struct clk_ops *ops; |
25 | void (*fixup)(u32 *val); |
26 | }; |
27 | |
28 | static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw) |
29 | { |
30 | struct clk_mux *mux = to_clk_mux(hw); |
31 | |
32 | return container_of(mux, struct clk_fixup_mux, mux); |
33 | } |
34 | |
35 | static u8 clk_fixup_mux_get_parent(struct clk_hw *hw) |
36 | { |
37 | struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); |
38 | |
39 | return fixup_mux->ops->get_parent(&fixup_mux->mux.hw); |
40 | } |
41 | |
42 | static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index) |
43 | { |
44 | struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); |
45 | struct clk_mux *mux = to_clk_mux(hw); |
46 | unsigned long flags; |
47 | u32 val; |
48 | |
49 | spin_lock_irqsave(mux->lock, flags); |
50 | |
51 | val = readl(addr: mux->reg); |
52 | val &= ~(mux->mask << mux->shift); |
53 | val |= index << mux->shift; |
54 | fixup_mux->fixup(&val); |
55 | writel(val, addr: mux->reg); |
56 | |
57 | spin_unlock_irqrestore(lock: mux->lock, flags); |
58 | |
59 | return 0; |
60 | } |
61 | |
62 | static const struct clk_ops clk_fixup_mux_ops = { |
63 | .determine_rate = clk_hw_determine_rate_no_reparent, |
64 | .get_parent = clk_fixup_mux_get_parent, |
65 | .set_parent = clk_fixup_mux_set_parent, |
66 | }; |
67 | |
68 | struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg, |
69 | u8 shift, u8 width, const char * const *parents, |
70 | int num_parents, void (*fixup)(u32 *val)) |
71 | { |
72 | struct clk_fixup_mux *fixup_mux; |
73 | struct clk_hw *hw; |
74 | struct clk_init_data init; |
75 | int ret; |
76 | |
77 | if (!fixup) |
78 | return ERR_PTR(error: -EINVAL); |
79 | |
80 | fixup_mux = kzalloc(size: sizeof(*fixup_mux), GFP_KERNEL); |
81 | if (!fixup_mux) |
82 | return ERR_PTR(error: -ENOMEM); |
83 | |
84 | init.name = name; |
85 | init.ops = &clk_fixup_mux_ops; |
86 | init.parent_names = parents; |
87 | init.num_parents = num_parents; |
88 | init.flags = 0; |
89 | |
90 | fixup_mux->mux.reg = reg; |
91 | fixup_mux->mux.shift = shift; |
92 | fixup_mux->mux.mask = BIT(width) - 1; |
93 | fixup_mux->mux.lock = &imx_ccm_lock; |
94 | fixup_mux->mux.hw.init = &init; |
95 | fixup_mux->ops = &clk_mux_ops; |
96 | fixup_mux->fixup = fixup; |
97 | |
98 | hw = &fixup_mux->mux.hw; |
99 | |
100 | ret = clk_hw_register(NULL, hw); |
101 | if (ret) { |
102 | kfree(objp: fixup_mux); |
103 | return ERR_PTR(error: ret); |
104 | } |
105 | |
106 | return hw; |
107 | } |
108 | |