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1da177e4 LT |
1 | /* |
2 | * linux/drivers/cpufreq/freq_table.c | |
3 | * | |
4 | * Copyright (C) 2002 - 2003 Dominik Brodowski | |
4f743694 DB |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
db701151 VK |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
1da177e4 | 14 | #include <linux/cpufreq.h> |
5ff0a268 | 15 | #include <linux/module.h> |
1da177e4 | 16 | |
1da177e4 LT |
17 | /********************************************************************* |
18 | * FREQUENCY TABLE HELPERS * | |
19 | *********************************************************************/ | |
20 | ||
21 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
22 | struct cpufreq_frequency_table *table) | |
23 | { | |
24 | unsigned int min_freq = ~0; | |
25 | unsigned int max_freq = 0; | |
355eb318 | 26 | unsigned int i; |
1da177e4 | 27 | |
97acec55 | 28 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
29 | unsigned int freq = table[i].frequency; |
30 | if (freq == CPUFREQ_ENTRY_INVALID) { | |
2d06d8c4 | 31 | pr_debug("table entry %u is invalid, skipping\n", i); |
1da177e4 LT |
32 | |
33 | continue; | |
34 | } | |
6f19efc0 | 35 | if (!cpufreq_boost_enabled() |
7f4b0461 | 36 | && (table[i].flags & CPUFREQ_BOOST_FREQ)) |
6f19efc0 LM |
37 | continue; |
38 | ||
ae87f10f | 39 | pr_debug("table entry %u: %u kHz\n", i, freq); |
1da177e4 LT |
40 | if (freq < min_freq) |
41 | min_freq = freq; | |
42 | if (freq > max_freq) | |
43 | max_freq = freq; | |
44 | } | |
45 | ||
46 | policy->min = policy->cpuinfo.min_freq = min_freq; | |
47 | policy->max = policy->cpuinfo.max_freq = max_freq; | |
48 | ||
49 | if (policy->min == ~0) | |
50 | return -EINVAL; | |
51 | else | |
52 | return 0; | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo); | |
55 | ||
56 | ||
57 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
58 | struct cpufreq_frequency_table *table) | |
59 | { | |
77db50c4 VK |
60 | unsigned int next_larger = ~0, freq, i = 0; |
61 | bool found = false; | |
1da177e4 | 62 | |
2d06d8c4 | 63 | pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n", |
e08f5f5b | 64 | policy->min, policy->max, policy->cpu); |
1da177e4 | 65 | |
be49e346 | 66 | cpufreq_verify_within_cpu_limits(policy); |
1da177e4 | 67 | |
77db50c4 | 68 | for (; freq = table[i].frequency, freq != CPUFREQ_TABLE_END; i++) { |
1da177e4 LT |
69 | if (freq == CPUFREQ_ENTRY_INVALID) |
70 | continue; | |
77db50c4 VK |
71 | if ((freq >= policy->min) && (freq <= policy->max)) { |
72 | found = true; | |
73 | break; | |
74 | } | |
75 | ||
76 | if ((next_larger > freq) && (freq > policy->max)) | |
1da177e4 LT |
77 | next_larger = freq; |
78 | } | |
79 | ||
77db50c4 | 80 | if (!found) { |
1da177e4 | 81 | policy->max = next_larger; |
be49e346 | 82 | cpufreq_verify_within_cpu_limits(policy); |
77db50c4 | 83 | } |
1da177e4 | 84 | |
2d06d8c4 | 85 | pr_debug("verification lead to (%u - %u kHz) for cpu %u\n", |
e08f5f5b | 86 | policy->min, policy->max, policy->cpu); |
1da177e4 LT |
87 | |
88 | return 0; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify); | |
91 | ||
18434512 | 92 | /* |
e0b3165b VK |
93 | * Generic routine to verify policy & frequency table, requires driver to set |
94 | * policy->freq_table prior to it. | |
18434512 VK |
95 | */ |
96 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy) | |
97 | { | |
98 | struct cpufreq_frequency_table *table = | |
99 | cpufreq_frequency_get_table(policy->cpu); | |
100 | if (!table) | |
101 | return -ENODEV; | |
102 | ||
103 | return cpufreq_frequency_table_verify(policy, table); | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify); | |
1da177e4 LT |
106 | |
107 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
108 | struct cpufreq_frequency_table *table, | |
109 | unsigned int target_freq, | |
110 | unsigned int relation, | |
111 | unsigned int *index) | |
112 | { | |
484944a5 | 113 | struct cpufreq_frequency_table optimal = { |
50701588 | 114 | .driver_data = ~0, |
484944a5 DJ |
115 | .frequency = 0, |
116 | }; | |
117 | struct cpufreq_frequency_table suboptimal = { | |
50701588 | 118 | .driver_data = ~0, |
484944a5 DJ |
119 | .frequency = 0, |
120 | }; | |
1da177e4 LT |
121 | unsigned int i; |
122 | ||
2d06d8c4 | 123 | pr_debug("request for target %u kHz (relation: %u) for cpu %u\n", |
e08f5f5b | 124 | target_freq, relation, policy->cpu); |
1da177e4 LT |
125 | |
126 | switch (relation) { | |
127 | case CPUFREQ_RELATION_H: | |
1da177e4 LT |
128 | suboptimal.frequency = ~0; |
129 | break; | |
130 | case CPUFREQ_RELATION_L: | |
131 | optimal.frequency = ~0; | |
1da177e4 LT |
132 | break; |
133 | } | |
134 | ||
97acec55 | 135 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
136 | unsigned int freq = table[i].frequency; |
137 | if (freq == CPUFREQ_ENTRY_INVALID) | |
138 | continue; | |
139 | if ((freq < policy->min) || (freq > policy->max)) | |
140 | continue; | |
97acec55 | 141 | switch (relation) { |
1da177e4 LT |
142 | case CPUFREQ_RELATION_H: |
143 | if (freq <= target_freq) { | |
144 | if (freq >= optimal.frequency) { | |
145 | optimal.frequency = freq; | |
50701588 | 146 | optimal.driver_data = i; |
1da177e4 LT |
147 | } |
148 | } else { | |
149 | if (freq <= suboptimal.frequency) { | |
150 | suboptimal.frequency = freq; | |
50701588 | 151 | suboptimal.driver_data = i; |
1da177e4 LT |
152 | } |
153 | } | |
154 | break; | |
155 | case CPUFREQ_RELATION_L: | |
156 | if (freq >= target_freq) { | |
157 | if (freq <= optimal.frequency) { | |
158 | optimal.frequency = freq; | |
50701588 | 159 | optimal.driver_data = i; |
1da177e4 LT |
160 | } |
161 | } else { | |
162 | if (freq >= suboptimal.frequency) { | |
163 | suboptimal.frequency = freq; | |
50701588 | 164 | suboptimal.driver_data = i; |
1da177e4 LT |
165 | } |
166 | } | |
167 | break; | |
168 | } | |
169 | } | |
50701588 VK |
170 | if (optimal.driver_data > i) { |
171 | if (suboptimal.driver_data > i) | |
1da177e4 | 172 | return -EINVAL; |
50701588 | 173 | *index = suboptimal.driver_data; |
1da177e4 | 174 | } else |
50701588 | 175 | *index = optimal.driver_data; |
1da177e4 | 176 | |
ae87f10f VK |
177 | pr_debug("target index is %u, freq is:%u kHz\n", *index, |
178 | table[*index].frequency); | |
1da177e4 LT |
179 | |
180 | return 0; | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target); | |
183 | ||
d3916691 VK |
184 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
185 | unsigned int freq) | |
186 | { | |
187 | struct cpufreq_frequency_table *table; | |
188 | int i; | |
189 | ||
190 | table = cpufreq_frequency_get_table(policy->cpu); | |
191 | if (unlikely(!table)) { | |
192 | pr_debug("%s: Unable to find frequency table\n", __func__); | |
193 | return -ENOENT; | |
194 | } | |
195 | ||
196 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
197 | if (table[i].frequency == freq) | |
198 | return i; | |
199 | } | |
200 | ||
201 | return -EINVAL; | |
202 | } | |
203 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index); | |
204 | ||
1da177e4 | 205 | /** |
e32d22f7 | 206 | * show_available_freqs - show available frequencies for the specified CPU |
1da177e4 | 207 | */ |
6f19efc0 LM |
208 | static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf, |
209 | bool show_boost) | |
1da177e4 LT |
210 | { |
211 | unsigned int i = 0; | |
1da177e4 | 212 | ssize_t count = 0; |
e0b3165b | 213 | struct cpufreq_frequency_table *table = policy->freq_table; |
1da177e4 | 214 | |
e0b3165b | 215 | if (!table) |
1da177e4 LT |
216 | return -ENODEV; |
217 | ||
97acec55 | 218 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
219 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
220 | continue; | |
6f19efc0 LM |
221 | /* |
222 | * show_boost = true and driver_data = BOOST freq | |
223 | * display BOOST freqs | |
224 | * | |
225 | * show_boost = false and driver_data = BOOST freq | |
226 | * show_boost = true and driver_data != BOOST freq | |
227 | * continue - do not display anything | |
228 | * | |
229 | * show_boost = false and driver_data != BOOST freq | |
230 | * display NON BOOST freqs | |
231 | */ | |
7f4b0461 | 232 | if (show_boost ^ (table[i].flags & CPUFREQ_BOOST_FREQ)) |
6f19efc0 LM |
233 | continue; |
234 | ||
1da177e4 LT |
235 | count += sprintf(&buf[count], "%d ", table[i].frequency); |
236 | } | |
237 | count += sprintf(&buf[count], "\n"); | |
238 | ||
239 | return count; | |
240 | ||
241 | } | |
242 | ||
6f19efc0 LM |
243 | #define cpufreq_attr_available_freq(_name) \ |
244 | struct freq_attr cpufreq_freq_attr_##_name##_freqs = \ | |
245 | __ATTR_RO(_name##_frequencies) | |
246 | ||
247 | /** | |
248 | * show_scaling_available_frequencies - show available normal frequencies for | |
249 | * the specified CPU | |
250 | */ | |
251 | static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy, | |
252 | char *buf) | |
253 | { | |
254 | return show_available_freqs(policy, buf, false); | |
255 | } | |
256 | cpufreq_attr_available_freq(scaling_available); | |
1da177e4 LT |
257 | EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs); |
258 | ||
6f19efc0 LM |
259 | /** |
260 | * show_available_boost_freqs - show available boost frequencies for | |
261 | * the specified CPU | |
262 | */ | |
263 | static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy, | |
264 | char *buf) | |
265 | { | |
266 | return show_available_freqs(policy, buf, true); | |
267 | } | |
268 | cpufreq_attr_available_freq(scaling_boost); | |
269 | EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs); | |
270 | ||
18434512 VK |
271 | struct freq_attr *cpufreq_generic_attr[] = { |
272 | &cpufreq_freq_attr_scaling_available_freqs, | |
6f19efc0 LM |
273 | #ifdef CONFIG_CPU_FREQ_BOOST_SW |
274 | &cpufreq_freq_attr_scaling_boost_freqs, | |
275 | #endif | |
18434512 VK |
276 | NULL, |
277 | }; | |
278 | EXPORT_SYMBOL_GPL(cpufreq_generic_attr); | |
279 | ||
27047a60 VK |
280 | int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, |
281 | struct cpufreq_frequency_table *table) | |
282 | { | |
283 | int ret = cpufreq_frequency_table_cpuinfo(policy, table); | |
284 | ||
285 | if (!ret) | |
e0b3165b | 286 | policy->freq_table = table; |
27047a60 VK |
287 | |
288 | return ret; | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show); | |
291 | ||
e0b3165b | 292 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); |
b8eed8af | 293 | |
1da177e4 LT |
294 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu) |
295 | { | |
e0b3165b VK |
296 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); |
297 | return policy ? policy->freq_table : NULL; | |
1da177e4 LT |
298 | } |
299 | EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table); | |
300 | ||
97acec55 DJ |
301 | MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); |
302 | MODULE_DESCRIPTION("CPUfreq frequency table helpers"); | |
303 | MODULE_LICENSE("GPL"); |