1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
4 */
5
6 #include <linux/clk-provider.h>
7 #include <linux/io.h>
8
9 #include "clk.h"
10
11 static inline struct tegra_clk_periph_fixed *
to_tegra_clk_periph_fixed(struct clk_hw * hw)12 to_tegra_clk_periph_fixed(struct clk_hw *hw)
13 {
14 return container_of(hw, struct tegra_clk_periph_fixed, hw);
15 }
16
tegra_clk_periph_fixed_is_enabled(struct clk_hw * hw)17 static int tegra_clk_periph_fixed_is_enabled(struct clk_hw *hw)
18 {
19 struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
20 u32 mask = 1 << (fixed->num % 32), value;
21
22 value = readl(fixed->base + fixed->regs->enb_reg);
23 if (value & mask) {
24 value = readl(fixed->base + fixed->regs->rst_reg);
25 if ((value & mask) == 0)
26 return 1;
27 }
28
29 return 0;
30 }
31
tegra_clk_periph_fixed_enable(struct clk_hw * hw)32 static int tegra_clk_periph_fixed_enable(struct clk_hw *hw)
33 {
34 struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
35 u32 mask = 1 << (fixed->num % 32);
36
37 writel(mask, fixed->base + fixed->regs->enb_set_reg);
38
39 return 0;
40 }
41
tegra_clk_periph_fixed_disable(struct clk_hw * hw)42 static void tegra_clk_periph_fixed_disable(struct clk_hw *hw)
43 {
44 struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
45 u32 mask = 1 << (fixed->num % 32);
46
47 writel(mask, fixed->base + fixed->regs->enb_clr_reg);
48 }
49
50 static unsigned long
tegra_clk_periph_fixed_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)51 tegra_clk_periph_fixed_recalc_rate(struct clk_hw *hw,
52 unsigned long parent_rate)
53 {
54 struct tegra_clk_periph_fixed *fixed = to_tegra_clk_periph_fixed(hw);
55 unsigned long long rate;
56
57 rate = (unsigned long long)parent_rate * fixed->mul;
58 do_div(rate, fixed->div);
59
60 return (unsigned long)rate;
61 }
62
63 static const struct clk_ops tegra_clk_periph_fixed_ops = {
64 .is_enabled = tegra_clk_periph_fixed_is_enabled,
65 .enable = tegra_clk_periph_fixed_enable,
66 .disable = tegra_clk_periph_fixed_disable,
67 .recalc_rate = tegra_clk_periph_fixed_recalc_rate,
68 };
69
tegra_clk_register_periph_fixed(const char * name,const char * parent,unsigned long flags,void __iomem * base,unsigned int mul,unsigned int div,unsigned int num)70 struct clk *tegra_clk_register_periph_fixed(const char *name,
71 const char *parent,
72 unsigned long flags,
73 void __iomem *base,
74 unsigned int mul,
75 unsigned int div,
76 unsigned int num)
77 {
78 const struct tegra_clk_periph_regs *regs;
79 struct tegra_clk_periph_fixed *fixed;
80 struct clk_init_data init;
81 struct clk *clk;
82
83 regs = get_reg_bank(num);
84 if (!regs)
85 return ERR_PTR(-EINVAL);
86
87 fixed = kzalloc(sizeof(*fixed), GFP_KERNEL);
88 if (!fixed)
89 return ERR_PTR(-ENOMEM);
90
91 init.name = name;
92 init.flags = flags;
93 init.parent_names = parent ? &parent : NULL;
94 init.num_parents = parent ? 1 : 0;
95 init.ops = &tegra_clk_periph_fixed_ops;
96
97 fixed->base = base;
98 fixed->regs = regs;
99 fixed->mul = mul;
100 fixed->div = div;
101 fixed->num = num;
102
103 fixed->hw.init = &init;
104
105 clk = clk_register(NULL, &fixed->hw);
106 if (IS_ERR(clk))
107 kfree(fixed);
108
109 return clk;
110 }
111