1 /*
2 *
3 * This software is licensed under the terms of the GNU General Public
4 * License version 2, as published by the Free Software Foundation, and
5 * may be copied, distributed, and modified under those terms.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12
13 #include <linux/slab.h>
14 #include <linux/bitops.h>
15 #include <linux/regmap.h>
16 #include <linux/clk.h>
17 #include <linux/clk-provider.h>
18 #include "clk.h"
19
20 struct rockchip_muxgrf_clock {
21 struct clk_hw hw;
22 struct regmap *regmap;
23 u32 reg;
24 u32 shift;
25 u32 width;
26 int flags;
27 };
28
29 #define to_muxgrf_clock(_hw) container_of(_hw, struct rockchip_muxgrf_clock, hw)
30
rockchip_muxgrf_get_parent(struct clk_hw * hw)31 static u8 rockchip_muxgrf_get_parent(struct clk_hw *hw)
32 {
33 struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
34 unsigned int mask = GENMASK(mux->width - 1, 0);
35 unsigned int val;
36
37 regmap_read(mux->regmap, mux->reg, &val);
38
39 val >>= mux->shift;
40 val &= mask;
41
42 return val;
43 }
44
rockchip_muxgrf_set_parent(struct clk_hw * hw,u8 index)45 static int rockchip_muxgrf_set_parent(struct clk_hw *hw, u8 index)
46 {
47 struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
48 unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
49 unsigned int val;
50
51 val = index;
52 val <<= mux->shift;
53
54 if (mux->flags & CLK_MUX_HIWORD_MASK)
55 return regmap_write(mux->regmap, mux->reg, val | (mask << 16));
56 else
57 return regmap_update_bits(mux->regmap, mux->reg, mask, val);
58 }
59
60 static const struct clk_ops rockchip_muxgrf_clk_ops = {
61 .get_parent = rockchip_muxgrf_get_parent,
62 .set_parent = rockchip_muxgrf_set_parent,
63 .determine_rate = __clk_mux_determine_rate,
64 };
65
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)66 struct clk *rockchip_clk_register_muxgrf(const char *name,
67 const char *const *parent_names, u8 num_parents,
68 int flags, struct regmap *regmap, int reg,
69 int shift, int width, int mux_flags)
70 {
71 struct rockchip_muxgrf_clock *muxgrf_clock;
72 struct clk_init_data init;
73 struct clk *clk;
74
75 if (IS_ERR(regmap)) {
76 pr_err("%s: regmap not available\n", __func__);
77 return ERR_PTR(-ENOTSUPP);
78 }
79
80 muxgrf_clock = kmalloc(sizeof(*muxgrf_clock), GFP_KERNEL);
81 if (!muxgrf_clock)
82 return ERR_PTR(-ENOMEM);
83
84 init.name = name;
85 init.flags = flags;
86 init.num_parents = num_parents;
87 init.parent_names = parent_names;
88 init.ops = &rockchip_muxgrf_clk_ops;
89
90 muxgrf_clock->hw.init = &init;
91 muxgrf_clock->regmap = regmap;
92 muxgrf_clock->reg = reg;
93 muxgrf_clock->shift = shift;
94 muxgrf_clock->width = width;
95 muxgrf_clock->flags = mux_flags;
96
97 clk = clk_register(NULL, &muxgrf_clock->hw);
98 if (IS_ERR(clk))
99 kfree(muxgrf_clock);
100
101 return clk;
102 }
103