1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/clk-provider.h>
8 #include <linux/export.h>
9 #include <linux/slab.h>
10 #include <linux/err.h>
11
12 #include "clk.h"
13
clk_periph_get_parent(struct clk_hw * hw)14 static u8 clk_periph_get_parent(struct clk_hw *hw)
15 {
16 struct tegra_clk_periph *periph = to_clk_periph(hw);
17 const struct clk_ops *mux_ops = periph->mux_ops;
18 struct clk_hw *mux_hw = &periph->mux.hw;
19
20 __clk_hw_set_clk(mux_hw, hw);
21
22 return mux_ops->get_parent(mux_hw);
23 }
24
clk_periph_set_parent(struct clk_hw * hw,u8 index)25 static int clk_periph_set_parent(struct clk_hw *hw, u8 index)
26 {
27 struct tegra_clk_periph *periph = to_clk_periph(hw);
28 const struct clk_ops *mux_ops = periph->mux_ops;
29 struct clk_hw *mux_hw = &periph->mux.hw;
30
31 __clk_hw_set_clk(mux_hw, hw);
32
33 return mux_ops->set_parent(mux_hw, index);
34 }
35
clk_periph_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)36 static unsigned long clk_periph_recalc_rate(struct clk_hw *hw,
37 unsigned long parent_rate)
38 {
39 struct tegra_clk_periph *periph = to_clk_periph(hw);
40 const struct clk_ops *div_ops = periph->div_ops;
41 struct clk_hw *div_hw = &periph->divider.hw;
42
43 __clk_hw_set_clk(div_hw, hw);
44
45 return div_ops->recalc_rate(div_hw, parent_rate);
46 }
47
clk_periph_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)48 static int clk_periph_determine_rate(struct clk_hw *hw,
49 struct clk_rate_request *req)
50 {
51 struct tegra_clk_periph *periph = to_clk_periph(hw);
52 const struct clk_ops *div_ops = periph->div_ops;
53 struct clk_hw *div_hw = &periph->divider.hw;
54 unsigned long rate;
55
56 __clk_hw_set_clk(div_hw, hw);
57
58 rate = div_ops->round_rate(div_hw, req->rate, &req->best_parent_rate);
59 if (rate < 0)
60 return rate;
61
62 req->rate = rate;
63 return 0;
64 }
65
clk_periph_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)66 static int clk_periph_set_rate(struct clk_hw *hw, unsigned long rate,
67 unsigned long parent_rate)
68 {
69 struct tegra_clk_periph *periph = to_clk_periph(hw);
70 const struct clk_ops *div_ops = periph->div_ops;
71 struct clk_hw *div_hw = &periph->divider.hw;
72
73 __clk_hw_set_clk(div_hw, hw);
74
75 return div_ops->set_rate(div_hw, rate, parent_rate);
76 }
77
clk_periph_is_enabled(struct clk_hw * hw)78 static int clk_periph_is_enabled(struct clk_hw *hw)
79 {
80 struct tegra_clk_periph *periph = to_clk_periph(hw);
81 const struct clk_ops *gate_ops = periph->gate_ops;
82 struct clk_hw *gate_hw = &periph->gate.hw;
83
84 __clk_hw_set_clk(gate_hw, hw);
85
86 return gate_ops->is_enabled(gate_hw);
87 }
88
clk_periph_enable(struct clk_hw * hw)89 static int clk_periph_enable(struct clk_hw *hw)
90 {
91 struct tegra_clk_periph *periph = to_clk_periph(hw);
92 const struct clk_ops *gate_ops = periph->gate_ops;
93 struct clk_hw *gate_hw = &periph->gate.hw;
94
95 __clk_hw_set_clk(gate_hw, hw);
96
97 return gate_ops->enable(gate_hw);
98 }
99
clk_periph_disable(struct clk_hw * hw)100 static void clk_periph_disable(struct clk_hw *hw)
101 {
102 struct tegra_clk_periph *periph = to_clk_periph(hw);
103 const struct clk_ops *gate_ops = periph->gate_ops;
104 struct clk_hw *gate_hw = &periph->gate.hw;
105
106 gate_ops->disable(gate_hw);
107 }
108
clk_periph_disable_unused(struct clk_hw * hw)109 static void clk_periph_disable_unused(struct clk_hw *hw)
110 {
111 struct tegra_clk_periph *periph = to_clk_periph(hw);
112 const struct clk_ops *gate_ops = periph->gate_ops;
113 struct clk_hw *gate_hw = &periph->gate.hw;
114
115 gate_ops->disable_unused(gate_hw);
116 }
117
clk_periph_restore_context(struct clk_hw * hw)118 static void clk_periph_restore_context(struct clk_hw *hw)
119 {
120 struct tegra_clk_periph *periph = to_clk_periph(hw);
121 const struct clk_ops *div_ops = periph->div_ops;
122 struct clk_hw *div_hw = &periph->divider.hw;
123 int parent_id;
124
125 parent_id = clk_hw_get_parent_index(hw);
126 if (WARN_ON(parent_id < 0))
127 return;
128
129 if (!(periph->gate.flags & TEGRA_PERIPH_NO_DIV))
130 div_ops->restore_context(div_hw);
131
132 clk_periph_set_parent(hw, parent_id);
133 }
134
135 const struct clk_ops tegra_clk_periph_ops = {
136 .get_parent = clk_periph_get_parent,
137 .set_parent = clk_periph_set_parent,
138 .recalc_rate = clk_periph_recalc_rate,
139 .determine_rate = clk_periph_determine_rate,
140 .set_rate = clk_periph_set_rate,
141 .is_enabled = clk_periph_is_enabled,
142 .enable = clk_periph_enable,
143 .disable = clk_periph_disable,
144 .disable_unused = clk_periph_disable_unused,
145 .restore_context = clk_periph_restore_context,
146 };
147
148 static const struct clk_ops tegra_clk_periph_nodiv_ops = {
149 .determine_rate = clk_hw_determine_rate_no_reparent,
150 .get_parent = clk_periph_get_parent,
151 .set_parent = clk_periph_set_parent,
152 .is_enabled = clk_periph_is_enabled,
153 .enable = clk_periph_enable,
154 .disable = clk_periph_disable,
155 .disable_unused = clk_periph_disable_unused,
156 .restore_context = clk_periph_restore_context,
157 };
158
159 static const struct clk_ops tegra_clk_periph_no_gate_ops = {
160 .get_parent = clk_periph_get_parent,
161 .set_parent = clk_periph_set_parent,
162 .recalc_rate = clk_periph_recalc_rate,
163 .determine_rate = clk_periph_determine_rate,
164 .set_rate = clk_periph_set_rate,
165 .restore_context = clk_periph_restore_context,
166 };
167
_tegra_clk_register_periph(const char * name,const char * const * parent_names,int num_parents,struct tegra_clk_periph * periph,void __iomem * clk_base,u32 offset,unsigned long flags)168 static struct clk *_tegra_clk_register_periph(const char *name,
169 const char * const *parent_names, int num_parents,
170 struct tegra_clk_periph *periph,
171 void __iomem *clk_base, u32 offset,
172 unsigned long flags)
173 {
174 struct clk *clk;
175 struct clk_init_data init;
176 const struct tegra_clk_periph_regs *bank;
177 bool div = !(periph->gate.flags & TEGRA_PERIPH_NO_DIV);
178
179 if (periph->gate.flags & TEGRA_PERIPH_NO_DIV) {
180 flags |= CLK_SET_RATE_PARENT;
181 init.ops = &tegra_clk_periph_nodiv_ops;
182 } else if (periph->gate.flags & TEGRA_PERIPH_NO_GATE)
183 init.ops = &tegra_clk_periph_no_gate_ops;
184 else
185 init.ops = &tegra_clk_periph_ops;
186
187 init.name = name;
188 init.flags = flags;
189 init.parent_names = parent_names;
190 init.num_parents = num_parents;
191
192 bank = get_reg_bank(periph->gate.clk_num);
193 if (!bank)
194 return ERR_PTR(-EINVAL);
195
196 /* Data in .init is copied by clk_register(), so stack variable OK */
197 periph->hw.init = &init;
198 periph->magic = TEGRA_CLK_PERIPH_MAGIC;
199 periph->mux.reg = clk_base + offset;
200 periph->divider.reg = div ? (clk_base + offset) : NULL;
201 periph->gate.clk_base = clk_base;
202 periph->gate.regs = bank;
203 periph->gate.enable_refcnt = periph_clk_enb_refcnt;
204
205 clk = clk_register(NULL, &periph->hw);
206 if (IS_ERR(clk))
207 return clk;
208
209 periph->mux.hw.clk = clk;
210 periph->divider.hw.clk = div ? clk : NULL;
211 periph->gate.hw.clk = clk;
212
213 return clk;
214 }
215
tegra_clk_register_periph(const char * name,const char * const * parent_names,int num_parents,struct tegra_clk_periph * periph,void __iomem * clk_base,u32 offset,unsigned long flags)216 struct clk *tegra_clk_register_periph(const char *name,
217 const char * const *parent_names, int num_parents,
218 struct tegra_clk_periph *periph, void __iomem *clk_base,
219 u32 offset, unsigned long flags)
220 {
221 return _tegra_clk_register_periph(name, parent_names, num_parents,
222 periph, clk_base, offset, flags);
223 }
224
tegra_clk_register_periph_nodiv(const char * name,const char * const * parent_names,int num_parents,struct tegra_clk_periph * periph,void __iomem * clk_base,u32 offset)225 struct clk *tegra_clk_register_periph_nodiv(const char *name,
226 const char * const *parent_names, int num_parents,
227 struct tegra_clk_periph *periph, void __iomem *clk_base,
228 u32 offset)
229 {
230 periph->gate.flags |= TEGRA_PERIPH_NO_DIV;
231 return _tegra_clk_register_periph(name, parent_names, num_parents,
232 periph, clk_base, offset, CLK_SET_RATE_PARENT);
233 }
234
tegra_clk_register_periph_data(void __iomem * clk_base,struct tegra_periph_init_data * init)235 struct clk *tegra_clk_register_periph_data(void __iomem *clk_base,
236 struct tegra_periph_init_data *init)
237 {
238 return _tegra_clk_register_periph(init->name, init->p.parent_names,
239 init->num_parents, &init->periph,
240 clk_base, init->offset, init->flags);
241 }
242