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ece70094 PG |
1 | /* |
2 | * Copyright (c) 2013 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/err.h> | |
20 | #include <linux/slab.h> | |
21 | ||
ece70094 PG |
22 | static u8 clk_composite_get_parent(struct clk_hw *hw) |
23 | { | |
24 | struct clk_composite *composite = to_clk_composite(hw); | |
25 | const struct clk_ops *mux_ops = composite->mux_ops; | |
26 | struct clk_hw *mux_hw = composite->mux_hw; | |
27 | ||
4e907ef6 | 28 | __clk_hw_set_clk(mux_hw, hw); |
ece70094 PG |
29 | |
30 | return mux_ops->get_parent(mux_hw); | |
31 | } | |
32 | ||
33 | static int clk_composite_set_parent(struct clk_hw *hw, u8 index) | |
34 | { | |
35 | struct clk_composite *composite = to_clk_composite(hw); | |
36 | const struct clk_ops *mux_ops = composite->mux_ops; | |
37 | struct clk_hw *mux_hw = composite->mux_hw; | |
38 | ||
4e907ef6 | 39 | __clk_hw_set_clk(mux_hw, hw); |
ece70094 PG |
40 | |
41 | return mux_ops->set_parent(mux_hw, index); | |
42 | } | |
43 | ||
44 | static unsigned long clk_composite_recalc_rate(struct clk_hw *hw, | |
45 | unsigned long parent_rate) | |
46 | { | |
47 | struct clk_composite *composite = to_clk_composite(hw); | |
d3a1c7be MT |
48 | const struct clk_ops *rate_ops = composite->rate_ops; |
49 | struct clk_hw *rate_hw = composite->rate_hw; | |
ece70094 | 50 | |
4e907ef6 | 51 | __clk_hw_set_clk(rate_hw, hw); |
ece70094 | 52 | |
d3a1c7be | 53 | return rate_ops->recalc_rate(rate_hw, parent_rate); |
ece70094 PG |
54 | } |
55 | ||
0817b62c BB |
56 | static int clk_composite_determine_rate(struct clk_hw *hw, |
57 | struct clk_rate_request *req) | |
107f3198 EL |
58 | { |
59 | struct clk_composite *composite = to_clk_composite(hw); | |
60 | const struct clk_ops *rate_ops = composite->rate_ops; | |
61 | const struct clk_ops *mux_ops = composite->mux_ops; | |
62 | struct clk_hw *rate_hw = composite->rate_hw; | |
63 | struct clk_hw *mux_hw = composite->mux_hw; | |
2f508a95 | 64 | struct clk_hw *parent; |
3eb635f1 BB |
65 | unsigned long parent_rate; |
66 | long tmp_rate, best_rate = 0; | |
67 | unsigned long rate_diff; | |
68 | unsigned long best_rate_diff = ULONG_MAX; | |
0817b62c | 69 | long rate; |
3eb635f1 | 70 | int i; |
107f3198 EL |
71 | |
72 | if (rate_hw && rate_ops && rate_ops->determine_rate) { | |
4e907ef6 | 73 | __clk_hw_set_clk(rate_hw, hw); |
0817b62c | 74 | return rate_ops->determine_rate(rate_hw, req); |
3eb635f1 BB |
75 | } else if (rate_hw && rate_ops && rate_ops->round_rate && |
76 | mux_hw && mux_ops && mux_ops->set_parent) { | |
0817b62c | 77 | req->best_parent_hw = NULL; |
3eb635f1 | 78 | |
98d8a60e | 79 | if (clk_hw_get_flags(hw) & CLK_SET_RATE_NO_REPARENT) { |
2f508a95 SB |
80 | parent = clk_hw_get_parent(mux_hw); |
81 | req->best_parent_hw = parent; | |
82 | req->best_parent_rate = clk_hw_get_rate(parent); | |
3eb635f1 | 83 | |
0817b62c BB |
84 | rate = rate_ops->round_rate(rate_hw, req->rate, |
85 | &req->best_parent_rate); | |
86 | if (rate < 0) | |
87 | return rate; | |
88 | ||
89 | req->rate = rate; | |
90 | return 0; | |
3eb635f1 BB |
91 | } |
92 | ||
497295af | 93 | for (i = 0; i < clk_hw_get_num_parents(mux_hw); i++) { |
2f508a95 | 94 | parent = clk_hw_get_parent_by_index(mux_hw, i); |
3eb635f1 BB |
95 | if (!parent) |
96 | continue; | |
97 | ||
2f508a95 | 98 | parent_rate = clk_hw_get_rate(parent); |
3eb635f1 | 99 | |
0817b62c | 100 | tmp_rate = rate_ops->round_rate(rate_hw, req->rate, |
3eb635f1 BB |
101 | &parent_rate); |
102 | if (tmp_rate < 0) | |
103 | continue; | |
104 | ||
0817b62c | 105 | rate_diff = abs(req->rate - tmp_rate); |
3eb635f1 | 106 | |
0817b62c | 107 | if (!rate_diff || !req->best_parent_hw |
3eb635f1 | 108 | || best_rate_diff > rate_diff) { |
2f508a95 | 109 | req->best_parent_hw = parent; |
0817b62c | 110 | req->best_parent_rate = parent_rate; |
3eb635f1 BB |
111 | best_rate_diff = rate_diff; |
112 | best_rate = tmp_rate; | |
113 | } | |
114 | ||
115 | if (!rate_diff) | |
0817b62c | 116 | return 0; |
3eb635f1 BB |
117 | } |
118 | ||
0817b62c BB |
119 | req->rate = best_rate; |
120 | return 0; | |
107f3198 | 121 | } else if (mux_hw && mux_ops && mux_ops->determine_rate) { |
4e907ef6 | 122 | __clk_hw_set_clk(mux_hw, hw); |
0817b62c | 123 | return mux_ops->determine_rate(mux_hw, req); |
107f3198 EL |
124 | } else { |
125 | pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n"); | |
57d866e6 | 126 | return -EINVAL; |
107f3198 EL |
127 | } |
128 | } | |
129 | ||
ece70094 PG |
130 | static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate, |
131 | unsigned long *prate) | |
132 | { | |
133 | struct clk_composite *composite = to_clk_composite(hw); | |
d3a1c7be MT |
134 | const struct clk_ops *rate_ops = composite->rate_ops; |
135 | struct clk_hw *rate_hw = composite->rate_hw; | |
ece70094 | 136 | |
4e907ef6 | 137 | __clk_hw_set_clk(rate_hw, hw); |
ece70094 | 138 | |
d3a1c7be | 139 | return rate_ops->round_rate(rate_hw, rate, prate); |
ece70094 PG |
140 | } |
141 | ||
142 | static int clk_composite_set_rate(struct clk_hw *hw, unsigned long rate, | |
143 | unsigned long parent_rate) | |
144 | { | |
145 | struct clk_composite *composite = to_clk_composite(hw); | |
d3a1c7be MT |
146 | const struct clk_ops *rate_ops = composite->rate_ops; |
147 | struct clk_hw *rate_hw = composite->rate_hw; | |
ece70094 | 148 | |
4e907ef6 | 149 | __clk_hw_set_clk(rate_hw, hw); |
ece70094 | 150 | |
d3a1c7be | 151 | return rate_ops->set_rate(rate_hw, rate, parent_rate); |
ece70094 PG |
152 | } |
153 | ||
154 | static int clk_composite_is_enabled(struct clk_hw *hw) | |
155 | { | |
156 | struct clk_composite *composite = to_clk_composite(hw); | |
157 | const struct clk_ops *gate_ops = composite->gate_ops; | |
158 | struct clk_hw *gate_hw = composite->gate_hw; | |
159 | ||
4e907ef6 | 160 | __clk_hw_set_clk(gate_hw, hw); |
ece70094 PG |
161 | |
162 | return gate_ops->is_enabled(gate_hw); | |
163 | } | |
164 | ||
165 | static int clk_composite_enable(struct clk_hw *hw) | |
166 | { | |
167 | struct clk_composite *composite = to_clk_composite(hw); | |
168 | const struct clk_ops *gate_ops = composite->gate_ops; | |
169 | struct clk_hw *gate_hw = composite->gate_hw; | |
170 | ||
4e907ef6 | 171 | __clk_hw_set_clk(gate_hw, hw); |
ece70094 PG |
172 | |
173 | return gate_ops->enable(gate_hw); | |
174 | } | |
175 | ||
176 | static void clk_composite_disable(struct clk_hw *hw) | |
177 | { | |
178 | struct clk_composite *composite = to_clk_composite(hw); | |
179 | const struct clk_ops *gate_ops = composite->gate_ops; | |
180 | struct clk_hw *gate_hw = composite->gate_hw; | |
181 | ||
4e907ef6 | 182 | __clk_hw_set_clk(gate_hw, hw); |
ece70094 PG |
183 | |
184 | gate_ops->disable(gate_hw); | |
185 | } | |
186 | ||
187 | struct clk *clk_register_composite(struct device *dev, const char *name, | |
2893c379 | 188 | const char * const *parent_names, int num_parents, |
ece70094 | 189 | struct clk_hw *mux_hw, const struct clk_ops *mux_ops, |
d3a1c7be | 190 | struct clk_hw *rate_hw, const struct clk_ops *rate_ops, |
ece70094 PG |
191 | struct clk_hw *gate_hw, const struct clk_ops *gate_ops, |
192 | unsigned long flags) | |
193 | { | |
194 | struct clk *clk; | |
195 | struct clk_init_data init; | |
196 | struct clk_composite *composite; | |
197 | struct clk_ops *clk_composite_ops; | |
198 | ||
199 | composite = kzalloc(sizeof(*composite), GFP_KERNEL); | |
d122db7e | 200 | if (!composite) |
ece70094 | 201 | return ERR_PTR(-ENOMEM); |
ece70094 PG |
202 | |
203 | init.name = name; | |
204 | init.flags = flags | CLK_IS_BASIC; | |
205 | init.parent_names = parent_names; | |
206 | init.num_parents = num_parents; | |
207 | ||
208 | clk_composite_ops = &composite->ops; | |
209 | ||
210 | if (mux_hw && mux_ops) { | |
0c02cf2f | 211 | if (!mux_ops->get_parent) { |
ece70094 PG |
212 | clk = ERR_PTR(-EINVAL); |
213 | goto err; | |
214 | } | |
215 | ||
216 | composite->mux_hw = mux_hw; | |
217 | composite->mux_ops = mux_ops; | |
218 | clk_composite_ops->get_parent = clk_composite_get_parent; | |
0c02cf2f HS |
219 | if (mux_ops->set_parent) |
220 | clk_composite_ops->set_parent = clk_composite_set_parent; | |
107f3198 EL |
221 | if (mux_ops->determine_rate) |
222 | clk_composite_ops->determine_rate = clk_composite_determine_rate; | |
ece70094 PG |
223 | } |
224 | ||
d3a1c7be | 225 | if (rate_hw && rate_ops) { |
f363e215 | 226 | if (!rate_ops->recalc_rate) { |
ece70094 PG |
227 | clk = ERR_PTR(-EINVAL); |
228 | goto err; | |
229 | } | |
5a994e15 | 230 | clk_composite_ops->recalc_rate = clk_composite_recalc_rate; |
ece70094 | 231 | |
5a994e15 MT |
232 | if (rate_ops->determine_rate) |
233 | clk_composite_ops->determine_rate = | |
234 | clk_composite_determine_rate; | |
235 | else if (rate_ops->round_rate) | |
236 | clk_composite_ops->round_rate = | |
237 | clk_composite_round_rate; | |
238 | ||
239 | /* .set_rate requires either .round_rate or .determine_rate */ | |
240 | if (rate_ops->set_rate) { | |
241 | if (rate_ops->determine_rate || rate_ops->round_rate) | |
242 | clk_composite_ops->set_rate = | |
243 | clk_composite_set_rate; | |
244 | else | |
245 | WARN(1, "%s: missing round_rate op is required\n", | |
246 | __func__); | |
f363e215 MT |
247 | } |
248 | ||
d3a1c7be MT |
249 | composite->rate_hw = rate_hw; |
250 | composite->rate_ops = rate_ops; | |
ece70094 PG |
251 | } |
252 | ||
253 | if (gate_hw && gate_ops) { | |
254 | if (!gate_ops->is_enabled || !gate_ops->enable || | |
255 | !gate_ops->disable) { | |
256 | clk = ERR_PTR(-EINVAL); | |
257 | goto err; | |
258 | } | |
259 | ||
260 | composite->gate_hw = gate_hw; | |
261 | composite->gate_ops = gate_ops; | |
262 | clk_composite_ops->is_enabled = clk_composite_is_enabled; | |
263 | clk_composite_ops->enable = clk_composite_enable; | |
264 | clk_composite_ops->disable = clk_composite_disable; | |
265 | } | |
266 | ||
267 | init.ops = clk_composite_ops; | |
268 | composite->hw.init = &init; | |
269 | ||
270 | clk = clk_register(dev, &composite->hw); | |
271 | if (IS_ERR(clk)) | |
272 | goto err; | |
273 | ||
274 | if (composite->mux_hw) | |
275 | composite->mux_hw->clk = clk; | |
276 | ||
d3a1c7be MT |
277 | if (composite->rate_hw) |
278 | composite->rate_hw->clk = clk; | |
ece70094 PG |
279 | |
280 | if (composite->gate_hw) | |
281 | composite->gate_hw->clk = clk; | |
282 | ||
283 | return clk; | |
284 | ||
285 | err: | |
286 | kfree(composite); | |
287 | return clk; | |
288 | } |