1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include <linux/slab.h>
4 #include <linux/bitops.h>
5 #include <linux/regmap.h>
6 #include <linux/clk.h>
7 #include <linux/clk-provider.h>
8 #include "clk.h"
9 
10 struct rockchip_muxgrf_clock {
11 	struct clk_hw		hw;
12 	struct regmap		*regmap;
13 	u32			reg;
14 	u32			shift;
15 	u32			width;
16 	int			flags;
17 };
18 
19 #define to_muxgrf_clock(_hw) container_of(_hw, struct rockchip_muxgrf_clock, hw)
20 
rockchip_muxgrf_get_parent(struct clk_hw * hw)21 static u8 rockchip_muxgrf_get_parent(struct clk_hw *hw)
22 {
23 	struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
24 	unsigned int mask = GENMASK(mux->width - 1, 0);
25 	unsigned int val;
26 
27 	regmap_read(mux->regmap, mux->reg, &val);
28 
29 	val >>= mux->shift;
30 	val &= mask;
31 
32 	return val;
33 }
34 
rockchip_muxgrf_set_parent(struct clk_hw * hw,u8 index)35 static int rockchip_muxgrf_set_parent(struct clk_hw *hw, u8 index)
36 {
37 	struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
38 	unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
39 	unsigned int val;
40 
41 	val = index;
42 	val <<= mux->shift;
43 
44 	if (mux->flags & CLK_MUX_HIWORD_MASK)
45 		return regmap_write(mux->regmap, mux->reg, val | (mask << 16));
46 	else
47 		return regmap_update_bits(mux->regmap, mux->reg, mask, val);
48 }
49 
50 static const struct clk_ops rockchip_muxgrf_clk_ops = {
51 	.get_parent = rockchip_muxgrf_get_parent,
52 	.set_parent = rockchip_muxgrf_set_parent,
53 	.determine_rate = __clk_mux_determine_rate,
54 };
55 
rockchip_clk_register_muxgrf(const char * name,const char * const * parent_names,u8 num_parents,int flags,struct regmap * regmap,int reg,int shift,int width,int mux_flags)56 struct clk *rockchip_clk_register_muxgrf(const char *name,
57 				const char *const *parent_names, u8 num_parents,
58 				int flags, struct regmap *regmap, int reg,
59 				int shift, int width, int mux_flags)
60 {
61 	struct rockchip_muxgrf_clock *muxgrf_clock;
62 	struct clk_init_data init;
63 	struct clk *clk;
64 
65 	if (IS_ERR(regmap)) {
66 		pr_err("%s: regmap not available\n", __func__);
67 		return ERR_PTR(-ENOTSUPP);
68 	}
69 
70 	muxgrf_clock = kmalloc(sizeof(*muxgrf_clock), GFP_KERNEL);
71 	if (!muxgrf_clock)
72 		return ERR_PTR(-ENOMEM);
73 
74 	init.name = name;
75 	init.flags = flags;
76 	init.num_parents = num_parents;
77 	init.parent_names = parent_names;
78 	init.ops = &rockchip_muxgrf_clk_ops;
79 
80 	muxgrf_clock->hw.init = &init;
81 	muxgrf_clock->regmap = regmap;
82 	muxgrf_clock->reg = reg;
83 	muxgrf_clock->shift = shift;
84 	muxgrf_clock->width = width;
85 	muxgrf_clock->flags = mux_flags;
86 
87 	clk = clk_register(NULL, &muxgrf_clock->hw);
88 	if (IS_ERR(clk))
89 		kfree(muxgrf_clock);
90 
91 	return clk;
92 }
93