1 /*
2 * Copyright (C) 2013 Freescale Semiconductor, Inc.
3 *
4 * The code contained herein is licensed under the GNU General Public
5 * License. You may obtain a copy of the GNU General Public License
6 * Version 2 or later at the following locations:
7 *
8 * http://www.opensource.org/licenses/gpl-license.html
9 * http://www.gnu.org/copyleft/gpl.html
10 */
11
12 #include <linux/clk-provider.h>
13 #include <linux/err.h>
14 #include <linux/io.h>
15 #include <linux/slab.h>
16 #include "clk.h"
17
18 #define to_clk_mux(_hw) container_of(_hw, struct clk_mux, hw)
19
20 /**
21 * struct clk_fixup_mux - imx integer fixup multiplexer clock
22 * @mux: the parent class
23 * @ops: pointer to clk_ops of parent class
24 * @fixup: a hook to fixup the write value
25 *
26 * The imx fixup multiplexer clock is a subclass of basic clk_mux
27 * with an addtional fixup hook.
28 */
29 struct clk_fixup_mux {
30 struct clk_mux mux;
31 const struct clk_ops *ops;
32 void (*fixup)(u32 *val);
33 };
34
to_clk_fixup_mux(struct clk_hw * hw)35 static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw)
36 {
37 struct clk_mux *mux = to_clk_mux(hw);
38
39 return container_of(mux, struct clk_fixup_mux, mux);
40 }
41
clk_fixup_mux_get_parent(struct clk_hw * hw)42 static u8 clk_fixup_mux_get_parent(struct clk_hw *hw)
43 {
44 struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
45
46 return fixup_mux->ops->get_parent(&fixup_mux->mux.hw);
47 }
48
clk_fixup_mux_set_parent(struct clk_hw * hw,u8 index)49 static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index)
50 {
51 struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
52 struct clk_mux *mux = to_clk_mux(hw);
53 unsigned long flags = 0;
54 u32 val;
55
56 spin_lock_irqsave(mux->lock, flags);
57
58 val = readl(mux->reg);
59 val &= ~(mux->mask << mux->shift);
60 val |= index << mux->shift;
61 fixup_mux->fixup(&val);
62 writel(val, mux->reg);
63
64 spin_unlock_irqrestore(mux->lock, flags);
65
66 return 0;
67 }
68
69 static const struct clk_ops clk_fixup_mux_ops = {
70 .get_parent = clk_fixup_mux_get_parent,
71 .set_parent = clk_fixup_mux_set_parent,
72 };
73
imx_clk_fixup_mux(const char * name,void __iomem * reg,u8 shift,u8 width,const char ** parents,int num_parents,void (* fixup)(u32 * val))74 struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg,
75 u8 shift, u8 width, const char **parents,
76 int num_parents, void (*fixup)(u32 *val))
77 {
78 struct clk_fixup_mux *fixup_mux;
79 struct clk *clk;
80 struct clk_init_data init;
81
82 if (!fixup)
83 return ERR_PTR(-EINVAL);
84
85 fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL);
86 if (!fixup_mux)
87 return ERR_PTR(-ENOMEM);
88
89 init.name = name;
90 init.ops = &clk_fixup_mux_ops;
91 init.parent_names = parents;
92 init.num_parents = num_parents;
93 init.flags = 0;
94
95 fixup_mux->mux.reg = reg;
96 fixup_mux->mux.shift = shift;
97 fixup_mux->mux.mask = BIT(width) - 1;
98 fixup_mux->mux.lock = &imx_ccm_lock;
99 fixup_mux->mux.hw.init = &init;
100 fixup_mux->ops = &clk_mux_ops;
101 fixup_mux->fixup = fixup;
102
103 clk = clk_register(NULL, &fixup_mux->mux.hw);
104 if (IS_ERR(clk))
105 kfree(fixup_mux);
106
107 return clk;
108 }
109