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path: root/drivers/clk/tegra/clk-periph.c
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Diffstat (limited to 'drivers/clk/tegra/clk-periph.c')
-rw-r--r--drivers/clk/tegra/clk-periph.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk-periph.c b/drivers/clk/tegra/clk-periph.c
new file mode 100644
index 000000000000..788486e6331a
--- /dev/null
+++ b/drivers/clk/tegra/clk-periph.c
@@ -0,0 +1,218 @@
1/*
2 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/clk.h>
18#include <linux/clk-provider.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 mux_hw->clk = hw->clk;
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 mux_hw->clk = hw->clk;
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 div_hw->clk = hw->clk;
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 div_hw->clk = hw->clk;
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 div_hw->clk = hw->clk;
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 gate_hw->clk = hw->clk;
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 gate_hw->clk = hw->clk;
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
113void tegra_periph_reset_deassert(struct clk *c)
114{
115 struct clk_hw *hw = __clk_get_hw(c);
116 struct tegra_clk_periph *periph = to_clk_periph(hw);
117 struct tegra_clk_periph_gate *gate;
118
119 if (periph->magic != TEGRA_CLK_PERIPH_MAGIC) {
120 gate = to_clk_periph_gate(hw);
121 if (gate->magic != TEGRA_CLK_PERIPH_GATE_MAGIC) {
122 WARN_ON(1);
123 return;
124 }
125 } else {
126 gate = &periph->gate;
127 }
128
129 tegra_periph_reset(gate, 0);
130}
131
132void tegra_periph_reset_assert(struct clk *c)
133{
134 struct clk_hw *hw = __clk_get_hw(c);
135 struct tegra_clk_periph *periph = to_clk_periph(hw);
136 struct tegra_clk_periph_gate *gate;
137
138 if (periph->magic != TEGRA_CLK_PERIPH_MAGIC) {
139 gate = to_clk_periph_gate(hw);
140 if (gate->magic != TEGRA_CLK_PERIPH_GATE_MAGIC) {
141 WARN_ON(1);
142 return;
143 }
144 } else {
145 gate = &periph->gate;
146 }
147
148 tegra_periph_reset(gate, 1);
149}
150
151const struct clk_ops tegra_clk_periph_ops = {
152 .get_parent = clk_periph_get_parent,
153 .set_parent = clk_periph_set_parent,
154 .recalc_rate = clk_periph_recalc_rate,
155 .round_rate = clk_periph_round_rate,
156 .set_rate = clk_periph_set_rate,
157 .is_enabled = clk_periph_is_enabled,
158 .enable = clk_periph_enable,
159 .disable = clk_periph_disable,
160};
161
162const struct clk_ops tegra_clk_periph_nodiv_ops = {
163 .get_parent = clk_periph_get_parent,
164 .set_parent = clk_periph_set_parent,
165 .is_enabled = clk_periph_is_enabled,
166 .enable = clk_periph_enable,
167 .disable = clk_periph_disable,
168};
169
170static struct clk *_tegra_clk_register_periph(const char *name,
171 const char **parent_names, int num_parents,
172 struct tegra_clk_periph *periph,
173 void __iomem *clk_base, u32 offset, bool div)
174{
175 struct clk *clk;
176 struct clk_init_data init;
177
178 init.name = name;
179 init.ops = div ? &tegra_clk_periph_ops : &tegra_clk_periph_nodiv_ops;
180 init.flags = div ? 0 : CLK_SET_RATE_PARENT;
181 init.parent_names = parent_names;
182 init.num_parents = num_parents;
183
184 /* Data in .init is copied by clk_register(), so stack variable OK */
185 periph->hw.init = &init;
186 periph->magic = TEGRA_CLK_PERIPH_MAGIC;
187 periph->mux.reg = clk_base + offset;
188 periph->divider.reg = div ? (clk_base + offset) : NULL;
189 periph->gate.clk_base = clk_base;
190
191 clk = clk_register(NULL, &periph->hw);
192 if (IS_ERR(clk))
193 return clk;
194
195 periph->mux.hw.clk = clk;
196 periph->divider.hw.clk = div ? clk : NULL;
197 periph->gate.hw.clk = clk;
198
199 return clk;
200}
201
202struct clk *tegra_clk_register_periph(const char *name,
203 const char **parent_names, int num_parents,
204 struct tegra_clk_periph *periph, void __iomem *clk_base,
205 u32 offset)
206{
207 return _tegra_clk_register_periph(name, parent_names, num_parents,
208 periph, clk_base, offset, true);
209}
210
211struct clk *tegra_clk_register_periph_nodiv(const char *name,
212 const char **parent_names, int num_parents,
213 struct tegra_clk_periph *periph, void __iomem *clk_base,
214 u32 offset)
215{
216 return _tegra_clk_register_periph(name, parent_names, num_parents,
217 periph, clk_base, offset, false);
218}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-07 19:21:36 -0500