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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 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/cpufreq.h> | |
18 | ||
1da177e4 LT |
19 | /********************************************************************* |
20 | * FREQUENCY TABLE HELPERS * | |
21 | *********************************************************************/ | |
22 | ||
23 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
24 | struct cpufreq_frequency_table *table) | |
25 | { | |
26 | unsigned int min_freq = ~0; | |
27 | unsigned int max_freq = 0; | |
355eb318 | 28 | unsigned int i; |
1da177e4 | 29 | |
97acec55 | 30 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
31 | unsigned int freq = table[i].frequency; |
32 | if (freq == CPUFREQ_ENTRY_INVALID) { | |
2d06d8c4 | 33 | pr_debug("table entry %u is invalid, skipping\n", i); |
1da177e4 LT |
34 | |
35 | continue; | |
36 | } | |
50701588 VK |
37 | pr_debug("table entry %u: %u kHz, %u driver_data\n", |
38 | i, freq, table[i].driver_data); | |
1da177e4 LT |
39 | if (freq < min_freq) |
40 | min_freq = freq; | |
41 | if (freq > max_freq) | |
42 | max_freq = freq; | |
43 | } | |
44 | ||
45 | policy->min = policy->cpuinfo.min_freq = min_freq; | |
46 | policy->max = policy->cpuinfo.max_freq = max_freq; | |
47 | ||
48 | if (policy->min == ~0) | |
49 | return -EINVAL; | |
50 | else | |
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo); | |
54 | ||
55 | ||
56 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
57 | struct cpufreq_frequency_table *table) | |
58 | { | |
59 | unsigned int next_larger = ~0; | |
5557976c | 60 | unsigned int i; |
1da177e4 LT |
61 | unsigned int count = 0; |
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 | |
e08f5f5b GS |
66 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
67 | policy->cpuinfo.max_freq); | |
1da177e4 | 68 | |
97acec55 | 69 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
70 | unsigned int freq = table[i].frequency; |
71 | if (freq == CPUFREQ_ENTRY_INVALID) | |
72 | continue; | |
73 | if ((freq >= policy->min) && (freq <= policy->max)) | |
74 | count++; | |
75 | else if ((next_larger > freq) && (freq > policy->max)) | |
76 | next_larger = freq; | |
77 | } | |
78 | ||
79 | if (!count) | |
80 | policy->max = next_larger; | |
81 | ||
e08f5f5b GS |
82 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
83 | policy->cpuinfo.max_freq); | |
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 | ||
92 | ||
93 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
94 | struct cpufreq_frequency_table *table, | |
95 | unsigned int target_freq, | |
96 | unsigned int relation, | |
97 | unsigned int *index) | |
98 | { | |
484944a5 | 99 | struct cpufreq_frequency_table optimal = { |
50701588 | 100 | .driver_data = ~0, |
484944a5 DJ |
101 | .frequency = 0, |
102 | }; | |
103 | struct cpufreq_frequency_table suboptimal = { | |
50701588 | 104 | .driver_data = ~0, |
484944a5 DJ |
105 | .frequency = 0, |
106 | }; | |
1da177e4 LT |
107 | unsigned int i; |
108 | ||
2d06d8c4 | 109 | pr_debug("request for target %u kHz (relation: %u) for cpu %u\n", |
e08f5f5b | 110 | target_freq, relation, policy->cpu); |
1da177e4 LT |
111 | |
112 | switch (relation) { | |
113 | case CPUFREQ_RELATION_H: | |
1da177e4 LT |
114 | suboptimal.frequency = ~0; |
115 | break; | |
116 | case CPUFREQ_RELATION_L: | |
117 | optimal.frequency = ~0; | |
1da177e4 LT |
118 | break; |
119 | } | |
120 | ||
97acec55 | 121 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
122 | unsigned int freq = table[i].frequency; |
123 | if (freq == CPUFREQ_ENTRY_INVALID) | |
124 | continue; | |
125 | if ((freq < policy->min) || (freq > policy->max)) | |
126 | continue; | |
97acec55 | 127 | switch (relation) { |
1da177e4 LT |
128 | case CPUFREQ_RELATION_H: |
129 | if (freq <= target_freq) { | |
130 | if (freq >= optimal.frequency) { | |
131 | optimal.frequency = freq; | |
50701588 | 132 | optimal.driver_data = i; |
1da177e4 LT |
133 | } |
134 | } else { | |
135 | if (freq <= suboptimal.frequency) { | |
136 | suboptimal.frequency = freq; | |
50701588 | 137 | suboptimal.driver_data = i; |
1da177e4 LT |
138 | } |
139 | } | |
140 | break; | |
141 | case CPUFREQ_RELATION_L: | |
142 | if (freq >= target_freq) { | |
143 | if (freq <= optimal.frequency) { | |
144 | optimal.frequency = freq; | |
50701588 | 145 | optimal.driver_data = i; |
1da177e4 LT |
146 | } |
147 | } else { | |
148 | if (freq >= suboptimal.frequency) { | |
149 | suboptimal.frequency = freq; | |
50701588 | 150 | suboptimal.driver_data = i; |
1da177e4 LT |
151 | } |
152 | } | |
153 | break; | |
154 | } | |
155 | } | |
50701588 VK |
156 | if (optimal.driver_data > i) { |
157 | if (suboptimal.driver_data > i) | |
1da177e4 | 158 | return -EINVAL; |
50701588 | 159 | *index = suboptimal.driver_data; |
1da177e4 | 160 | } else |
50701588 | 161 | *index = optimal.driver_data; |
1da177e4 | 162 | |
2d06d8c4 | 163 | pr_debug("target is %u (%u kHz, %u)\n", *index, table[*index].frequency, |
50701588 | 164 | table[*index].driver_data); |
1da177e4 LT |
165 | |
166 | return 0; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target); | |
169 | ||
f1625066 | 170 | static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table); |
1da177e4 | 171 | /** |
e32d22f7 | 172 | * show_available_freqs - show available frequencies for the specified CPU |
1da177e4 | 173 | */ |
97acec55 | 174 | static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf) |
1da177e4 LT |
175 | { |
176 | unsigned int i = 0; | |
177 | unsigned int cpu = policy->cpu; | |
178 | ssize_t count = 0; | |
179 | struct cpufreq_frequency_table *table; | |
180 | ||
f1625066 | 181 | if (!per_cpu(cpufreq_show_table, cpu)) |
1da177e4 LT |
182 | return -ENODEV; |
183 | ||
f1625066 | 184 | table = per_cpu(cpufreq_show_table, cpu); |
1da177e4 | 185 | |
97acec55 | 186 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
187 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
188 | continue; | |
189 | count += sprintf(&buf[count], "%d ", table[i].frequency); | |
190 | } | |
191 | count += sprintf(&buf[count], "\n"); | |
192 | ||
193 | return count; | |
194 | ||
195 | } | |
196 | ||
197 | struct freq_attr cpufreq_freq_attr_scaling_available_freqs = { | |
e08f5f5b GS |
198 | .attr = { .name = "scaling_available_frequencies", |
199 | .mode = 0444, | |
e08f5f5b | 200 | }, |
1da177e4 LT |
201 | .show = show_available_freqs, |
202 | }; | |
203 | EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs); | |
204 | ||
205 | /* | |
206 | * if you use these, you must assure that the frequency table is valid | |
207 | * all the time between get_attr and put_attr! | |
208 | */ | |
32ee8c3e | 209 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, |
1da177e4 LT |
210 | unsigned int cpu) |
211 | { | |
2d06d8c4 | 212 | pr_debug("setting show_table for cpu %u to %p\n", cpu, table); |
f1625066 | 213 | per_cpu(cpufreq_show_table, cpu) = table; |
1da177e4 LT |
214 | } |
215 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr); | |
216 | ||
217 | void cpufreq_frequency_table_put_attr(unsigned int cpu) | |
218 | { | |
2d06d8c4 | 219 | pr_debug("clearing show_table for cpu %u\n", cpu); |
f1625066 | 220 | per_cpu(cpufreq_show_table, cpu) = NULL; |
1da177e4 LT |
221 | } |
222 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr); | |
223 | ||
b8eed8af VK |
224 | void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy) |
225 | { | |
226 | pr_debug("Updating show_table for new_cpu %u from last_cpu %u\n", | |
227 | policy->cpu, policy->last_cpu); | |
228 | per_cpu(cpufreq_show_table, policy->cpu) = per_cpu(cpufreq_show_table, | |
229 | policy->last_cpu); | |
230 | per_cpu(cpufreq_show_table, policy->last_cpu) = NULL; | |
231 | } | |
232 | ||
1da177e4 LT |
233 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu) |
234 | { | |
f1625066 | 235 | return per_cpu(cpufreq_show_table, cpu); |
1da177e4 LT |
236 | } |
237 | EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table); | |
238 | ||
97acec55 DJ |
239 | MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); |
240 | MODULE_DESCRIPTION("CPUfreq frequency table helpers"); | |
241 | MODULE_LICENSE("GPL"); |