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
to_clk_fixup_mux(struct clk_hw * hw)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
clk_fixup_mux_get_parent(struct clk_hw * hw)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
clk_fixup_mux_set_parent(struct clk_hw * hw,u8 index)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(mux->reg);
52 val &= ~(mux->mask << mux->shift);
53 val |= index << mux->shift;
54 fixup_mux->fixup(&val);
55 writel(val, mux->reg);
56
57 spin_unlock_irqrestore(mux->lock, flags);
58
59 return 0;
60 }
61
62 static const struct clk_ops clk_fixup_mux_ops = {
63 .get_parent = clk_fixup_mux_get_parent,
64 .set_parent = clk_fixup_mux_set_parent,
65 };
66
imx_clk_hw_fixup_mux(const char * name,void __iomem * reg,u8 shift,u8 width,const char * const * parents,int num_parents,void (* fixup)(u32 * val))67 struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg,
68 u8 shift, u8 width, const char * const *parents,
69 int num_parents, void (*fixup)(u32 *val))
70 {
71 struct clk_fixup_mux *fixup_mux;
72 struct clk_hw *hw;
73 struct clk_init_data init;
74 int ret;
75
76 if (!fixup)
77 return ERR_PTR(-EINVAL);
78
79 fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL);
80 if (!fixup_mux)
81 return ERR_PTR(-ENOMEM);
82
83 init.name = name;
84 init.ops = &clk_fixup_mux_ops;
85 init.parent_names = parents;
86 init.num_parents = num_parents;
87 init.flags = 0;
88
89 fixup_mux->mux.reg = reg;
90 fixup_mux->mux.shift = shift;
91 fixup_mux->mux.mask = BIT(width) - 1;
92 fixup_mux->mux.lock = &imx_ccm_lock;
93 fixup_mux->mux.hw.init = &init;
94 fixup_mux->ops = &clk_mux_ops;
95 fixup_mux->fixup = fixup;
96
97 hw = &fixup_mux->mux.hw;
98
99 ret = clk_hw_register(NULL, hw);
100 if (ret) {
101 kfree(fixup_mux);
102 return ERR_PTR(ret);
103 }
104
105 return hw;
106 }
107