Commit | Line | Data |
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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 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/cpufreq.h> | |
16 | ||
e08f5f5b GS |
17 | #define dprintk(msg...) \ |
18 | cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg) | |
1da177e4 LT |
19 | |
20 | /********************************************************************* | |
21 | * FREQUENCY TABLE HELPERS * | |
22 | *********************************************************************/ | |
23 | ||
24 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
25 | struct cpufreq_frequency_table *table) | |
26 | { | |
27 | unsigned int min_freq = ~0; | |
28 | unsigned int max_freq = 0; | |
355eb318 | 29 | unsigned int i; |
1da177e4 | 30 | |
97acec55 | 31 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
32 | unsigned int freq = table[i].frequency; |
33 | if (freq == CPUFREQ_ENTRY_INVALID) { | |
34 | dprintk("table entry %u is invalid, skipping\n", i); | |
35 | ||
36 | continue; | |
37 | } | |
e08f5f5b GS |
38 | dprintk("table entry %u: %u kHz, %u index\n", |
39 | i, freq, table[i].index); | |
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 | { | |
60 | unsigned int next_larger = ~0; | |
5557976c | 61 | unsigned int i; |
1da177e4 LT |
62 | unsigned int count = 0; |
63 | ||
e08f5f5b GS |
64 | dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n", |
65 | policy->min, policy->max, policy->cpu); | |
1da177e4 LT |
66 | |
67 | if (!cpu_online(policy->cpu)) | |
68 | return -EINVAL; | |
69 | ||
e08f5f5b GS |
70 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
71 | policy->cpuinfo.max_freq); | |
1da177e4 | 72 | |
97acec55 | 73 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
74 | unsigned int freq = table[i].frequency; |
75 | if (freq == CPUFREQ_ENTRY_INVALID) | |
76 | continue; | |
77 | if ((freq >= policy->min) && (freq <= policy->max)) | |
78 | count++; | |
79 | else if ((next_larger > freq) && (freq > policy->max)) | |
80 | next_larger = freq; | |
81 | } | |
82 | ||
83 | if (!count) | |
84 | policy->max = next_larger; | |
85 | ||
e08f5f5b GS |
86 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
87 | policy->cpuinfo.max_freq); | |
1da177e4 | 88 | |
e08f5f5b GS |
89 | dprintk("verification lead to (%u - %u kHz) for cpu %u\n", |
90 | policy->min, policy->max, policy->cpu); | |
1da177e4 LT |
91 | |
92 | return 0; | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify); | |
95 | ||
96 | ||
97 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
98 | struct cpufreq_frequency_table *table, | |
99 | unsigned int target_freq, | |
100 | unsigned int relation, | |
101 | unsigned int *index) | |
102 | { | |
484944a5 DJ |
103 | struct cpufreq_frequency_table optimal = { |
104 | .index = ~0, | |
105 | .frequency = 0, | |
106 | }; | |
107 | struct cpufreq_frequency_table suboptimal = { | |
108 | .index = ~0, | |
109 | .frequency = 0, | |
110 | }; | |
1da177e4 LT |
111 | unsigned int i; |
112 | ||
e08f5f5b GS |
113 | dprintk("request for target %u kHz (relation: %u) for cpu %u\n", |
114 | target_freq, relation, policy->cpu); | |
1da177e4 LT |
115 | |
116 | switch (relation) { | |
117 | case CPUFREQ_RELATION_H: | |
1da177e4 LT |
118 | suboptimal.frequency = ~0; |
119 | break; | |
120 | case CPUFREQ_RELATION_L: | |
121 | optimal.frequency = ~0; | |
1da177e4 LT |
122 | break; |
123 | } | |
124 | ||
125 | if (!cpu_online(policy->cpu)) | |
126 | return -EINVAL; | |
127 | ||
97acec55 | 128 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
129 | unsigned int freq = table[i].frequency; |
130 | if (freq == CPUFREQ_ENTRY_INVALID) | |
131 | continue; | |
132 | if ((freq < policy->min) || (freq > policy->max)) | |
133 | continue; | |
97acec55 | 134 | switch (relation) { |
1da177e4 LT |
135 | case CPUFREQ_RELATION_H: |
136 | if (freq <= target_freq) { | |
137 | if (freq >= optimal.frequency) { | |
138 | optimal.frequency = freq; | |
139 | optimal.index = i; | |
140 | } | |
141 | } else { | |
142 | if (freq <= suboptimal.frequency) { | |
143 | suboptimal.frequency = freq; | |
144 | suboptimal.index = i; | |
145 | } | |
146 | } | |
147 | break; | |
148 | case CPUFREQ_RELATION_L: | |
149 | if (freq >= target_freq) { | |
150 | if (freq <= optimal.frequency) { | |
151 | optimal.frequency = freq; | |
152 | optimal.index = i; | |
153 | } | |
154 | } else { | |
155 | if (freq >= suboptimal.frequency) { | |
156 | suboptimal.frequency = freq; | |
157 | suboptimal.index = i; | |
158 | } | |
159 | } | |
160 | break; | |
161 | } | |
162 | } | |
163 | if (optimal.index > i) { | |
164 | if (suboptimal.index > i) | |
165 | return -EINVAL; | |
166 | *index = suboptimal.index; | |
167 | } else | |
168 | *index = optimal.index; | |
169 | ||
170 | dprintk("target is %u (%u kHz, %u)\n", *index, table[*index].frequency, | |
171 | table[*index].index); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target); | |
176 | ||
f1625066 | 177 | static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table); |
1da177e4 | 178 | /** |
e32d22f7 | 179 | * show_available_freqs - show available frequencies for the specified CPU |
1da177e4 | 180 | */ |
97acec55 | 181 | static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf) |
1da177e4 LT |
182 | { |
183 | unsigned int i = 0; | |
184 | unsigned int cpu = policy->cpu; | |
185 | ssize_t count = 0; | |
186 | struct cpufreq_frequency_table *table; | |
187 | ||
f1625066 | 188 | if (!per_cpu(cpufreq_show_table, cpu)) |
1da177e4 LT |
189 | return -ENODEV; |
190 | ||
f1625066 | 191 | table = per_cpu(cpufreq_show_table, cpu); |
1da177e4 | 192 | |
97acec55 | 193 | for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) { |
1da177e4 LT |
194 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
195 | continue; | |
196 | count += sprintf(&buf[count], "%d ", table[i].frequency); | |
197 | } | |
198 | count += sprintf(&buf[count], "\n"); | |
199 | ||
200 | return count; | |
201 | ||
202 | } | |
203 | ||
204 | struct freq_attr cpufreq_freq_attr_scaling_available_freqs = { | |
e08f5f5b GS |
205 | .attr = { .name = "scaling_available_frequencies", |
206 | .mode = 0444, | |
e08f5f5b | 207 | }, |
1da177e4 LT |
208 | .show = show_available_freqs, |
209 | }; | |
210 | EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs); | |
211 | ||
212 | /* | |
213 | * if you use these, you must assure that the frequency table is valid | |
214 | * all the time between get_attr and put_attr! | |
215 | */ | |
32ee8c3e | 216 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, |
1da177e4 LT |
217 | unsigned int cpu) |
218 | { | |
219 | dprintk("setting show_table for cpu %u to %p\n", cpu, table); | |
f1625066 | 220 | per_cpu(cpufreq_show_table, cpu) = table; |
1da177e4 LT |
221 | } |
222 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr); | |
223 | ||
224 | void cpufreq_frequency_table_put_attr(unsigned int cpu) | |
225 | { | |
226 | dprintk("clearing show_table for cpu %u\n", cpu); | |
f1625066 | 227 | per_cpu(cpufreq_show_table, cpu) = NULL; |
1da177e4 LT |
228 | } |
229 | EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr); | |
230 | ||
231 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu) | |
232 | { | |
f1625066 | 233 | return per_cpu(cpufreq_show_table, cpu); |
1da177e4 LT |
234 | } |
235 | EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table); | |
236 | ||
97acec55 DJ |
237 | MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); |
238 | MODULE_DESCRIPTION("CPUfreq frequency table helpers"); | |
239 | MODULE_LICENSE("GPL"); |