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17#include <linux/clk-provider.h>
18#include <linux/export.h>
19#include <linux/slab.h>
20#include <linux/err.h>
21
22#include "clk.h"
23
24static u8 clk_periph_get_parent(struct clk_hw *hw)
25{
26 struct tegra_clk_periph *periph = to_clk_periph(hw);
27 const struct clk_ops *mux_ops = periph->mux_ops;
28 struct clk_hw *mux_hw = &periph->mux.hw;
29
30 __clk_hw_set_clk(mux_hw, hw);
31
32 return mux_ops->get_parent(mux_hw);
33}
34
35static int clk_periph_set_parent(struct clk_hw *hw, u8 index)
36{
37 struct tegra_clk_periph *periph = to_clk_periph(hw);
38 const struct clk_ops *mux_ops = periph->mux_ops;
39 struct clk_hw *mux_hw = &periph->mux.hw;
40
41 __clk_hw_set_clk(mux_hw, hw);
42
43 return mux_ops->set_parent(mux_hw, index);
44}
45
46static unsigned long clk_periph_recalc_rate(struct clk_hw *hw,
47 unsigned long parent_rate)
48{
49 struct tegra_clk_periph *periph = to_clk_periph(hw);
50 const struct clk_ops *div_ops = periph->div_ops;
51 struct clk_hw *div_hw = &periph->divider.hw;
52
53 __clk_hw_set_clk(div_hw, hw);
54
55 return div_ops->recalc_rate(div_hw, parent_rate);
56}
57
58static long clk_periph_round_rate(struct clk_hw *hw, unsigned long rate,
59 unsigned long *prate)
60{
61 struct tegra_clk_periph *periph = to_clk_periph(hw);
62 const struct clk_ops *div_ops = periph->div_ops;
63 struct clk_hw *div_hw = &periph->divider.hw;
64
65 __clk_hw_set_clk(div_hw, hw);
66
67 return div_ops->round_rate(div_hw, rate, prate);
68}
69
70static int clk_periph_set_rate(struct clk_hw *hw, unsigned long rate,
71 unsigned long parent_rate)
72{
73 struct tegra_clk_periph *periph = to_clk_periph(hw);
74 const struct clk_ops *div_ops = periph->div_ops;
75 struct clk_hw *div_hw = &periph->divider.hw;
76
77 __clk_hw_set_clk(div_hw, hw);
78
79 return div_ops->set_rate(div_hw, rate, parent_rate);
80}
81
82static int clk_periph_is_enabled(struct clk_hw *hw)
83{
84 struct tegra_clk_periph *periph = to_clk_periph(hw);
85 const struct clk_ops *gate_ops = periph->gate_ops;
86 struct clk_hw *gate_hw = &periph->gate.hw;
87
88 __clk_hw_set_clk(gate_hw, hw);
89
90 return gate_ops->is_enabled(gate_hw);
91}
92
93static int clk_periph_enable(struct clk_hw *hw)
94{
95 struct tegra_clk_periph *periph = to_clk_periph(hw);
96 const struct clk_ops *gate_ops = periph->gate_ops;
97 struct clk_hw *gate_hw = &periph->gate.hw;
98
99 __clk_hw_set_clk(gate_hw, hw);
100
101 return gate_ops->enable(gate_hw);
102}
103
104static void clk_periph_disable(struct clk_hw *hw)
105{
106 struct tegra_clk_periph *periph = to_clk_periph(hw);
107 const struct clk_ops *gate_ops = periph->gate_ops;
108 struct clk_hw *gate_hw = &periph->gate.hw;
109
110 gate_ops->disable(gate_hw);
111}
112
113const struct clk_ops tegra_clk_periph_ops = {
114 .get_parent = clk_periph_get_parent,
115 .set_parent = clk_periph_set_parent,
116 .recalc_rate = clk_periph_recalc_rate,
117 .round_rate = clk_periph_round_rate,
118 .set_rate = clk_periph_set_rate,
119 .is_enabled = clk_periph_is_enabled,
120 .enable = clk_periph_enable,
121 .disable = clk_periph_disable,
122};
123
124static const struct clk_ops tegra_clk_periph_nodiv_ops = {
125 .get_parent = clk_periph_get_parent,
126 .set_parent = clk_periph_set_parent,
127 .is_enabled = clk_periph_is_enabled,
128 .enable = clk_periph_enable,
129 .disable = clk_periph_disable,
130};
131
132static const struct clk_ops tegra_clk_periph_no_gate_ops = {
133 .get_parent = clk_periph_get_parent,
134 .set_parent = clk_periph_set_parent,
135 .recalc_rate = clk_periph_recalc_rate,
136 .round_rate = clk_periph_round_rate,
137 .set_rate = clk_periph_set_rate,
138};
139
140static struct clk *_tegra_clk_register_periph(const char *name,
141 const char * const *parent_names, int num_parents,
142 struct tegra_clk_periph *periph,
143 void __iomem *clk_base, u32 offset,
144 unsigned long flags)
145{
146 struct clk *clk;
147 struct clk_init_data init;
148 const struct tegra_clk_periph_regs *bank;
149 bool div = !(periph->gate.flags & TEGRA_PERIPH_NO_DIV);
150
151 if (periph->gate.flags & TEGRA_PERIPH_NO_DIV) {
152 flags |= CLK_SET_RATE_PARENT;
153 init.ops = &tegra_clk_periph_nodiv_ops;
154 } else if (periph->gate.flags & TEGRA_PERIPH_NO_GATE)
155 init.ops = &tegra_clk_periph_no_gate_ops;
156 else
157 init.ops = &tegra_clk_periph_ops;
158
159 init.name = name;
160 init.flags = flags;
161 init.parent_names = parent_names;
162 init.num_parents = num_parents;
163
164 bank = get_reg_bank(periph->gate.clk_num);
165 if (!bank)
166 return ERR_PTR(-EINVAL);
167
168
169 periph->hw.init = &init;
170 periph->magic = TEGRA_CLK_PERIPH_MAGIC;
171 periph->mux.reg = clk_base + offset;
172 periph->divider.reg = div ? (clk_base + offset) : NULL;
173 periph->gate.clk_base = clk_base;
174 periph->gate.regs = bank;
175 periph->gate.enable_refcnt = periph_clk_enb_refcnt;
176
177 clk = clk_register(NULL, &periph->hw);
178 if (IS_ERR(clk))
179 return clk;
180
181 periph->mux.hw.clk = clk;
182 periph->divider.hw.clk = div ? clk : NULL;
183 periph->gate.hw.clk = clk;
184
185 return clk;
186}
187
188struct clk *tegra_clk_register_periph(const char *name,
189 const char * const *parent_names, int num_parents,
190 struct tegra_clk_periph *periph, void __iomem *clk_base,
191 u32 offset, unsigned long flags)
192{
193 return _tegra_clk_register_periph(name, parent_names, num_parents,
194 periph, clk_base, offset, flags);
195}
196
197struct clk *tegra_clk_register_periph_nodiv(const char *name,
198 const char * const *parent_names, int num_parents,
199 struct tegra_clk_periph *periph, void __iomem *clk_base,
200 u32 offset)
201{
202 periph->gate.flags |= TEGRA_PERIPH_NO_DIV;
203 return _tegra_clk_register_periph(name, parent_names, num_parents,
204 periph, clk_base, offset, CLK_SET_RATE_PARENT);
205}
206
