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
14static 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(dst: mux_hw, src: hw);
21
22 return mux_ops->get_parent(mux_hw);
23}
24
25static 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(dst: mux_hw, src: hw);
32
33 return mux_ops->set_parent(mux_hw, index);
34}
35
36static 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(dst: div_hw, src: hw);
44
45 return div_ops->recalc_rate(div_hw, parent_rate);
46}
47
48static 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(dst: div_hw, src: 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
66static 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(dst: div_hw, src: hw);
74
75 return div_ops->set_rate(div_hw, rate, parent_rate);
76}
77
78static 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(dst: gate_hw, src: hw);
85
86 return gate_ops->is_enabled(gate_hw);
87}
88
89static 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(dst: gate_hw, src: hw);
96
97 return gate_ops->enable(gate_hw);
98}
99
100static 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
109static 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
118static 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, index: parent_id);
133}
134
135const 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
148static 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
159static 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
168static 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(clkid: periph->gate.clk_num);
193 if (!bank)
194 return ERR_PTR(error: -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, hw: &periph->hw);
206 if (IS_ERR(ptr: 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
216struct 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
225struct 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
235struct clk *tegra_clk_register_periph_data(void __iomem *clk_base,
236 struct tegra_periph_init_data *init)
237{
238 return _tegra_clk_register_periph(name: init->name, parent_names: init->p.parent_names,
239 num_parents: init->num_parents, periph: &init->periph,
240 clk_base, offset: init->offset, flags: init->flags);
241}
242

source code of linux/drivers/clk/tegra/clk-periph.c