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8a67f0ef VK |
1 | /* |
2 | * ARM big.LITTLE Platforms CPUFreq support | |
3 | * | |
4 | * Copyright (C) 2013 ARM Ltd. | |
5 | * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> | |
6 | * | |
7 | * Copyright (C) 2013 Linaro. | |
8 | * Viresh Kumar <viresh.kumar@linaro.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
15 | * kind, whether express or implied; without even the implied warranty | |
16 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
22 | #include <linux/clk.h> | |
23 | #include <linux/cpu.h> | |
24 | #include <linux/cpufreq.h> | |
25 | #include <linux/cpumask.h> | |
2f7e8a17 | 26 | #include <linux/cpu_cooling.h> |
8a67f0ef | 27 | #include <linux/export.h> |
39c8bbaf | 28 | #include <linux/module.h> |
e79a23c5 | 29 | #include <linux/mutex.h> |
8a67f0ef | 30 | #include <linux/of_platform.h> |
e4db1c74 | 31 | #include <linux/pm_opp.h> |
8a67f0ef VK |
32 | #include <linux/slab.h> |
33 | #include <linux/topology.h> | |
34 | #include <linux/types.h> | |
35 | ||
36 | #include "arm_big_little.h" | |
37 | ||
38 | /* Currently we support only two clusters */ | |
e79a23c5 VK |
39 | #define A15_CLUSTER 0 |
40 | #define A7_CLUSTER 1 | |
8a67f0ef VK |
41 | #define MAX_CLUSTERS 2 |
42 | ||
e79a23c5 | 43 | #ifdef CONFIG_BL_SWITCHER |
14730145 | 44 | #include <asm/bL_switcher.h> |
45cac118 NP |
45 | static bool bL_switching_enabled; |
46 | #define is_bL_switching_enabled() bL_switching_enabled | |
47 | #define set_switching_enabled(x) (bL_switching_enabled = (x)) | |
e79a23c5 VK |
48 | #else |
49 | #define is_bL_switching_enabled() false | |
45cac118 | 50 | #define set_switching_enabled(x) do { } while (0) |
14730145 SH |
51 | #define bL_switch_request(...) do { } while (0) |
52 | #define bL_switcher_put_enabled() do { } while (0) | |
53 | #define bL_switcher_get_enabled() do { } while (0) | |
e79a23c5 VK |
54 | #endif |
55 | ||
56 | #define ACTUAL_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq << 1 : freq) | |
57 | #define VIRT_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq >> 1 : freq) | |
58 | ||
2f7e8a17 | 59 | static struct thermal_cooling_device *cdev[MAX_CLUSTERS]; |
8a67f0ef VK |
60 | static struct cpufreq_arm_bL_ops *arm_bL_ops; |
61 | static struct clk *clk[MAX_CLUSTERS]; | |
e79a23c5 VK |
62 | static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS + 1]; |
63 | static atomic_t cluster_usage[MAX_CLUSTERS + 1]; | |
64 | ||
65 | static unsigned int clk_big_min; /* (Big) clock frequencies */ | |
66 | static unsigned int clk_little_max; /* Maximum clock frequency (Little) */ | |
67 | ||
68 | static DEFINE_PER_CPU(unsigned int, physical_cluster); | |
69 | static DEFINE_PER_CPU(unsigned int, cpu_last_req_freq); | |
70 | ||
71 | static struct mutex cluster_lock[MAX_CLUSTERS]; | |
72 | ||
73 | static inline int raw_cpu_to_cluster(int cpu) | |
74 | { | |
75 | return topology_physical_package_id(cpu); | |
76 | } | |
77 | ||
78 | static inline int cpu_to_cluster(int cpu) | |
79 | { | |
80 | return is_bL_switching_enabled() ? | |
81 | MAX_CLUSTERS : raw_cpu_to_cluster(cpu); | |
82 | } | |
83 | ||
84 | static unsigned int find_cluster_maxfreq(int cluster) | |
85 | { | |
86 | int j; | |
87 | u32 max_freq = 0, cpu_freq; | |
88 | ||
89 | for_each_online_cpu(j) { | |
90 | cpu_freq = per_cpu(cpu_last_req_freq, j); | |
91 | ||
92 | if ((cluster == per_cpu(physical_cluster, j)) && | |
93 | (max_freq < cpu_freq)) | |
94 | max_freq = cpu_freq; | |
95 | } | |
96 | ||
97 | pr_debug("%s: cluster: %d, max freq: %d\n", __func__, cluster, | |
98 | max_freq); | |
99 | ||
100 | return max_freq; | |
101 | } | |
102 | ||
103 | static unsigned int clk_get_cpu_rate(unsigned int cpu) | |
104 | { | |
105 | u32 cur_cluster = per_cpu(physical_cluster, cpu); | |
106 | u32 rate = clk_get_rate(clk[cur_cluster]) / 1000; | |
107 | ||
108 | /* For switcher we use virtual A7 clock rates */ | |
109 | if (is_bL_switching_enabled()) | |
110 | rate = VIRT_FREQ(cur_cluster, rate); | |
111 | ||
112 | pr_debug("%s: cpu: %d, cluster: %d, freq: %u\n", __func__, cpu, | |
113 | cur_cluster, rate); | |
114 | ||
115 | return rate; | |
116 | } | |
117 | ||
118 | static unsigned int bL_cpufreq_get_rate(unsigned int cpu) | |
119 | { | |
120 | if (is_bL_switching_enabled()) { | |
121 | pr_debug("%s: freq: %d\n", __func__, per_cpu(cpu_last_req_freq, | |
122 | cpu)); | |
123 | ||
124 | return per_cpu(cpu_last_req_freq, cpu); | |
125 | } else { | |
126 | return clk_get_cpu_rate(cpu); | |
127 | } | |
128 | } | |
8a67f0ef | 129 | |
e79a23c5 VK |
130 | static unsigned int |
131 | bL_cpufreq_set_rate(u32 cpu, u32 old_cluster, u32 new_cluster, u32 rate) | |
8a67f0ef | 132 | { |
e79a23c5 VK |
133 | u32 new_rate, prev_rate; |
134 | int ret; | |
135 | bool bLs = is_bL_switching_enabled(); | |
136 | ||
137 | mutex_lock(&cluster_lock[new_cluster]); | |
138 | ||
139 | if (bLs) { | |
140 | prev_rate = per_cpu(cpu_last_req_freq, cpu); | |
141 | per_cpu(cpu_last_req_freq, cpu) = rate; | |
142 | per_cpu(physical_cluster, cpu) = new_cluster; | |
143 | ||
144 | new_rate = find_cluster_maxfreq(new_cluster); | |
145 | new_rate = ACTUAL_FREQ(new_cluster, new_rate); | |
146 | } else { | |
147 | new_rate = rate; | |
148 | } | |
149 | ||
150 | pr_debug("%s: cpu: %d, old cluster: %d, new cluster: %d, freq: %d\n", | |
151 | __func__, cpu, old_cluster, new_cluster, new_rate); | |
152 | ||
153 | ret = clk_set_rate(clk[new_cluster], new_rate * 1000); | |
14f1ba3a JMT |
154 | if (!ret) { |
155 | /* | |
156 | * FIXME: clk_set_rate hasn't returned an error here however it | |
157 | * may be that clk_change_rate failed due to hardware or | |
158 | * firmware issues and wasn't able to report that due to the | |
159 | * current design of the clk core layer. To work around this | |
160 | * problem we will read back the clock rate and check it is | |
161 | * correct. This needs to be removed once clk core is fixed. | |
162 | */ | |
163 | if (clk_get_rate(clk[new_cluster]) != new_rate * 1000) | |
164 | ret = -EIO; | |
165 | } | |
166 | ||
e79a23c5 VK |
167 | if (WARN_ON(ret)) { |
168 | pr_err("clk_set_rate failed: %d, new cluster: %d\n", ret, | |
169 | new_cluster); | |
170 | if (bLs) { | |
171 | per_cpu(cpu_last_req_freq, cpu) = prev_rate; | |
172 | per_cpu(physical_cluster, cpu) = old_cluster; | |
173 | } | |
174 | ||
175 | mutex_unlock(&cluster_lock[new_cluster]); | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
180 | mutex_unlock(&cluster_lock[new_cluster]); | |
181 | ||
182 | /* Recalc freq for old cluster when switching clusters */ | |
183 | if (old_cluster != new_cluster) { | |
184 | pr_debug("%s: cpu: %d, old cluster: %d, new cluster: %d\n", | |
185 | __func__, cpu, old_cluster, new_cluster); | |
186 | ||
187 | /* Switch cluster */ | |
188 | bL_switch_request(cpu, new_cluster); | |
189 | ||
190 | mutex_lock(&cluster_lock[old_cluster]); | |
8a67f0ef | 191 | |
e79a23c5 VK |
192 | /* Set freq of old cluster if there are cpus left on it */ |
193 | new_rate = find_cluster_maxfreq(old_cluster); | |
194 | new_rate = ACTUAL_FREQ(old_cluster, new_rate); | |
195 | ||
196 | if (new_rate) { | |
197 | pr_debug("%s: Updating rate of old cluster: %d, to freq: %d\n", | |
198 | __func__, old_cluster, new_rate); | |
199 | ||
200 | if (clk_set_rate(clk[old_cluster], new_rate * 1000)) | |
201 | pr_err("%s: clk_set_rate failed: %d, old cluster: %d\n", | |
202 | __func__, ret, old_cluster); | |
203 | } | |
204 | mutex_unlock(&cluster_lock[old_cluster]); | |
205 | } | |
206 | ||
207 | return 0; | |
8a67f0ef VK |
208 | } |
209 | ||
8a67f0ef VK |
210 | /* Set clock frequency */ |
211 | static int bL_cpufreq_set_target(struct cpufreq_policy *policy, | |
9c0ebcf7 | 212 | unsigned int index) |
8a67f0ef | 213 | { |
e79a23c5 | 214 | u32 cpu = policy->cpu, cur_cluster, new_cluster, actual_cluster; |
d4019f0a | 215 | unsigned int freqs_new; |
8a67f0ef | 216 | |
e79a23c5 VK |
217 | cur_cluster = cpu_to_cluster(cpu); |
218 | new_cluster = actual_cluster = per_cpu(physical_cluster, cpu); | |
8a67f0ef | 219 | |
d4019f0a | 220 | freqs_new = freq_table[cur_cluster][index].frequency; |
8a67f0ef | 221 | |
e79a23c5 VK |
222 | if (is_bL_switching_enabled()) { |
223 | if ((actual_cluster == A15_CLUSTER) && | |
d4019f0a | 224 | (freqs_new < clk_big_min)) { |
e79a23c5 VK |
225 | new_cluster = A7_CLUSTER; |
226 | } else if ((actual_cluster == A7_CLUSTER) && | |
d4019f0a | 227 | (freqs_new > clk_little_max)) { |
e79a23c5 VK |
228 | new_cluster = A15_CLUSTER; |
229 | } | |
230 | } | |
231 | ||
d4019f0a | 232 | return bL_cpufreq_set_rate(cpu, actual_cluster, new_cluster, freqs_new); |
8a67f0ef VK |
233 | } |
234 | ||
e79a23c5 VK |
235 | static inline u32 get_table_count(struct cpufreq_frequency_table *table) |
236 | { | |
237 | int count; | |
238 | ||
239 | for (count = 0; table[count].frequency != CPUFREQ_TABLE_END; count++) | |
240 | ; | |
241 | ||
242 | return count; | |
243 | } | |
244 | ||
245 | /* get the minimum frequency in the cpufreq_frequency_table */ | |
246 | static inline u32 get_table_min(struct cpufreq_frequency_table *table) | |
247 | { | |
041526f9 | 248 | struct cpufreq_frequency_table *pos; |
e79a23c5 | 249 | uint32_t min_freq = ~0; |
041526f9 SK |
250 | cpufreq_for_each_entry(pos, table) |
251 | if (pos->frequency < min_freq) | |
252 | min_freq = pos->frequency; | |
e79a23c5 VK |
253 | return min_freq; |
254 | } | |
255 | ||
256 | /* get the maximum frequency in the cpufreq_frequency_table */ | |
257 | static inline u32 get_table_max(struct cpufreq_frequency_table *table) | |
258 | { | |
041526f9 | 259 | struct cpufreq_frequency_table *pos; |
e79a23c5 | 260 | uint32_t max_freq = 0; |
041526f9 SK |
261 | cpufreq_for_each_entry(pos, table) |
262 | if (pos->frequency > max_freq) | |
263 | max_freq = pos->frequency; | |
e79a23c5 VK |
264 | return max_freq; |
265 | } | |
266 | ||
267 | static int merge_cluster_tables(void) | |
268 | { | |
269 | int i, j, k = 0, count = 1; | |
270 | struct cpufreq_frequency_table *table; | |
271 | ||
272 | for (i = 0; i < MAX_CLUSTERS; i++) | |
273 | count += get_table_count(freq_table[i]); | |
274 | ||
275 | table = kzalloc(sizeof(*table) * count, GFP_KERNEL); | |
276 | if (!table) | |
277 | return -ENOMEM; | |
278 | ||
279 | freq_table[MAX_CLUSTERS] = table; | |
280 | ||
281 | /* Add in reverse order to get freqs in increasing order */ | |
282 | for (i = MAX_CLUSTERS - 1; i >= 0; i--) { | |
283 | for (j = 0; freq_table[i][j].frequency != CPUFREQ_TABLE_END; | |
284 | j++) { | |
285 | table[k].frequency = VIRT_FREQ(i, | |
286 | freq_table[i][j].frequency); | |
287 | pr_debug("%s: index: %d, freq: %d\n", __func__, k, | |
288 | table[k].frequency); | |
289 | k++; | |
290 | } | |
291 | } | |
292 | ||
293 | table[k].driver_data = k; | |
294 | table[k].frequency = CPUFREQ_TABLE_END; | |
295 | ||
296 | pr_debug("%s: End, table: %p, count: %d\n", __func__, table, k); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static void _put_cluster_clk_and_freq_table(struct device *cpu_dev) | |
302 | { | |
303 | u32 cluster = raw_cpu_to_cluster(cpu_dev->id); | |
304 | ||
305 | if (!freq_table[cluster]) | |
306 | return; | |
307 | ||
308 | clk_put(clk[cluster]); | |
309 | dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]); | |
493b4cd2 VK |
310 | if (arm_bL_ops->free_opp_table) |
311 | arm_bL_ops->free_opp_table(cpu_dev); | |
e79a23c5 VK |
312 | dev_dbg(cpu_dev, "%s: cluster: %d\n", __func__, cluster); |
313 | } | |
314 | ||
8a67f0ef VK |
315 | static void put_cluster_clk_and_freq_table(struct device *cpu_dev) |
316 | { | |
317 | u32 cluster = cpu_to_cluster(cpu_dev->id); | |
e79a23c5 VK |
318 | int i; |
319 | ||
320 | if (atomic_dec_return(&cluster_usage[cluster])) | |
321 | return; | |
322 | ||
323 | if (cluster < MAX_CLUSTERS) | |
324 | return _put_cluster_clk_and_freq_table(cpu_dev); | |
8a67f0ef | 325 | |
e79a23c5 VK |
326 | for_each_present_cpu(i) { |
327 | struct device *cdev = get_cpu_device(i); | |
328 | if (!cdev) { | |
329 | pr_err("%s: failed to get cpu%d device\n", __func__, i); | |
330 | return; | |
331 | } | |
332 | ||
333 | _put_cluster_clk_and_freq_table(cdev); | |
8a67f0ef | 334 | } |
e79a23c5 VK |
335 | |
336 | /* free virtual table */ | |
337 | kfree(freq_table[cluster]); | |
8a67f0ef VK |
338 | } |
339 | ||
e79a23c5 | 340 | static int _get_cluster_clk_and_freq_table(struct device *cpu_dev) |
8a67f0ef | 341 | { |
e79a23c5 | 342 | u32 cluster = raw_cpu_to_cluster(cpu_dev->id); |
8a67f0ef VK |
343 | int ret; |
344 | ||
e79a23c5 | 345 | if (freq_table[cluster]) |
8a67f0ef VK |
346 | return 0; |
347 | ||
348 | ret = arm_bL_ops->init_opp_table(cpu_dev); | |
349 | if (ret) { | |
350 | dev_err(cpu_dev, "%s: init_opp_table failed, cpu: %d, err: %d\n", | |
351 | __func__, cpu_dev->id, ret); | |
e79a23c5 | 352 | goto out; |
8a67f0ef VK |
353 | } |
354 | ||
5d4879cd | 355 | ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table[cluster]); |
8a67f0ef VK |
356 | if (ret) { |
357 | dev_err(cpu_dev, "%s: failed to init cpufreq table, cpu: %d, err: %d\n", | |
358 | __func__, cpu_dev->id, ret); | |
493b4cd2 | 359 | goto free_opp_table; |
8a67f0ef VK |
360 | } |
361 | ||
b904f5cc | 362 | clk[cluster] = clk_get(cpu_dev, NULL); |
8a67f0ef VK |
363 | if (!IS_ERR(clk[cluster])) { |
364 | dev_dbg(cpu_dev, "%s: clk: %p & freq table: %p, cluster: %d\n", | |
365 | __func__, clk[cluster], freq_table[cluster], | |
366 | cluster); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d, cluster: %d\n", | |
371 | __func__, cpu_dev->id, cluster); | |
372 | ret = PTR_ERR(clk[cluster]); | |
5d4879cd | 373 | dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]); |
8a67f0ef | 374 | |
493b4cd2 VK |
375 | free_opp_table: |
376 | if (arm_bL_ops->free_opp_table) | |
377 | arm_bL_ops->free_opp_table(cpu_dev); | |
e79a23c5 | 378 | out: |
8a67f0ef VK |
379 | dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__, |
380 | cluster); | |
381 | return ret; | |
382 | } | |
383 | ||
e79a23c5 VK |
384 | static int get_cluster_clk_and_freq_table(struct device *cpu_dev) |
385 | { | |
386 | u32 cluster = cpu_to_cluster(cpu_dev->id); | |
387 | int i, ret; | |
388 | ||
389 | if (atomic_inc_return(&cluster_usage[cluster]) != 1) | |
390 | return 0; | |
391 | ||
392 | if (cluster < MAX_CLUSTERS) { | |
393 | ret = _get_cluster_clk_and_freq_table(cpu_dev); | |
394 | if (ret) | |
395 | atomic_dec(&cluster_usage[cluster]); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Get data for all clusters and fill virtual cluster with a merge of | |
401 | * both | |
402 | */ | |
403 | for_each_present_cpu(i) { | |
404 | struct device *cdev = get_cpu_device(i); | |
405 | if (!cdev) { | |
406 | pr_err("%s: failed to get cpu%d device\n", __func__, i); | |
407 | return -ENODEV; | |
408 | } | |
409 | ||
410 | ret = _get_cluster_clk_and_freq_table(cdev); | |
411 | if (ret) | |
412 | goto put_clusters; | |
413 | } | |
414 | ||
415 | ret = merge_cluster_tables(); | |
416 | if (ret) | |
417 | goto put_clusters; | |
418 | ||
419 | /* Assuming 2 cluster, set clk_big_min and clk_little_max */ | |
420 | clk_big_min = get_table_min(freq_table[0]); | |
421 | clk_little_max = VIRT_FREQ(1, get_table_max(freq_table[1])); | |
422 | ||
423 | pr_debug("%s: cluster: %d, clk_big_min: %d, clk_little_max: %d\n", | |
424 | __func__, cluster, clk_big_min, clk_little_max); | |
425 | ||
426 | return 0; | |
427 | ||
428 | put_clusters: | |
429 | for_each_present_cpu(i) { | |
430 | struct device *cdev = get_cpu_device(i); | |
431 | if (!cdev) { | |
432 | pr_err("%s: failed to get cpu%d device\n", __func__, i); | |
433 | return -ENODEV; | |
434 | } | |
435 | ||
436 | _put_cluster_clk_and_freq_table(cdev); | |
437 | } | |
438 | ||
439 | atomic_dec(&cluster_usage[cluster]); | |
440 | ||
441 | return ret; | |
442 | } | |
443 | ||
8a67f0ef VK |
444 | /* Per-CPU initialization */ |
445 | static int bL_cpufreq_init(struct cpufreq_policy *policy) | |
446 | { | |
447 | u32 cur_cluster = cpu_to_cluster(policy->cpu); | |
448 | struct device *cpu_dev; | |
449 | int ret; | |
450 | ||
451 | cpu_dev = get_cpu_device(policy->cpu); | |
452 | if (!cpu_dev) { | |
453 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
454 | policy->cpu); | |
455 | return -ENODEV; | |
456 | } | |
457 | ||
458 | ret = get_cluster_clk_and_freq_table(cpu_dev); | |
459 | if (ret) | |
460 | return ret; | |
461 | ||
39b10ebe | 462 | ret = cpufreq_table_validate_and_show(policy, freq_table[cur_cluster]); |
8a67f0ef VK |
463 | if (ret) { |
464 | dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n", | |
465 | policy->cpu, cur_cluster); | |
466 | put_cluster_clk_and_freq_table(cpu_dev); | |
467 | return ret; | |
468 | } | |
469 | ||
e79a23c5 | 470 | if (cur_cluster < MAX_CLUSTERS) { |
8f3ba3d3 | 471 | int cpu; |
472 | ||
e79a23c5 VK |
473 | cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu)); |
474 | ||
8f3ba3d3 | 475 | for_each_cpu(cpu, policy->cpus) |
476 | per_cpu(physical_cluster, cpu) = cur_cluster; | |
e79a23c5 VK |
477 | } else { |
478 | /* Assumption: during init, we are always running on A15 */ | |
479 | per_cpu(physical_cluster, policy->cpu) = A15_CLUSTER; | |
480 | } | |
481 | ||
8a67f0ef VK |
482 | if (arm_bL_ops->get_transition_latency) |
483 | policy->cpuinfo.transition_latency = | |
484 | arm_bL_ops->get_transition_latency(cpu_dev); | |
485 | else | |
486 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
487 | ||
e79a23c5 VK |
488 | if (is_bL_switching_enabled()) |
489 | per_cpu(cpu_last_req_freq, policy->cpu) = clk_get_cpu_rate(policy->cpu); | |
8a67f0ef | 490 | |
2b80f313 | 491 | dev_info(cpu_dev, "%s: CPU %d initialized\n", __func__, policy->cpu); |
8a67f0ef VK |
492 | return 0; |
493 | } | |
494 | ||
495 | static int bL_cpufreq_exit(struct cpufreq_policy *policy) | |
496 | { | |
497 | struct device *cpu_dev; | |
2f7e8a17 PA |
498 | int cur_cluster = cpu_to_cluster(policy->cpu); |
499 | ||
500 | if (cur_cluster < MAX_CLUSTERS) { | |
501 | cpufreq_cooling_unregister(cdev[cur_cluster]); | |
502 | cdev[cur_cluster] = NULL; | |
503 | } | |
8a67f0ef VK |
504 | |
505 | cpu_dev = get_cpu_device(policy->cpu); | |
506 | if (!cpu_dev) { | |
507 | pr_err("%s: failed to get cpu%d device\n", __func__, | |
508 | policy->cpu); | |
509 | return -ENODEV; | |
510 | } | |
511 | ||
512 | put_cluster_clk_and_freq_table(cpu_dev); | |
513 | dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
2f7e8a17 PA |
518 | static void bL_cpufreq_ready(struct cpufreq_policy *policy) |
519 | { | |
520 | struct device *cpu_dev = get_cpu_device(policy->cpu); | |
521 | int cur_cluster = cpu_to_cluster(policy->cpu); | |
522 | struct device_node *np; | |
523 | ||
524 | /* Do not register a cpu_cooling device if we are in IKS mode */ | |
525 | if (cur_cluster >= MAX_CLUSTERS) | |
526 | return; | |
527 | ||
528 | np = of_node_get(cpu_dev->of_node); | |
529 | if (WARN_ON(!np)) | |
530 | return; | |
531 | ||
532 | if (of_find_property(np, "#cooling-cells", NULL)) { | |
533 | u32 power_coefficient = 0; | |
534 | ||
535 | of_property_read_u32(np, "dynamic-power-coefficient", | |
536 | &power_coefficient); | |
537 | ||
538 | cdev[cur_cluster] = of_cpufreq_power_cooling_register(np, | |
539 | policy->related_cpus, power_coefficient, NULL); | |
540 | if (IS_ERR(cdev[cur_cluster])) { | |
541 | dev_err(cpu_dev, | |
542 | "running cpufreq without cooling device: %ld\n", | |
543 | PTR_ERR(cdev[cur_cluster])); | |
544 | cdev[cur_cluster] = NULL; | |
545 | } | |
546 | } | |
547 | of_node_put(np); | |
548 | } | |
549 | ||
8a67f0ef VK |
550 | static struct cpufreq_driver bL_cpufreq_driver = { |
551 | .name = "arm-big-little", | |
0b981e70 | 552 | .flags = CPUFREQ_STICKY | |
ae6b4271 VK |
553 | CPUFREQ_HAVE_GOVERNOR_PER_POLICY | |
554 | CPUFREQ_NEED_INITIAL_FREQ_CHECK, | |
3c75a150 | 555 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 556 | .target_index = bL_cpufreq_set_target, |
e79a23c5 | 557 | .get = bL_cpufreq_get_rate, |
8a67f0ef VK |
558 | .init = bL_cpufreq_init, |
559 | .exit = bL_cpufreq_exit, | |
2f7e8a17 | 560 | .ready = bL_cpufreq_ready, |
3c75a150 | 561 | .attr = cpufreq_generic_attr, |
8a67f0ef VK |
562 | }; |
563 | ||
14730145 | 564 | #ifdef CONFIG_BL_SWITCHER |
45cac118 NP |
565 | static int bL_cpufreq_switcher_notifier(struct notifier_block *nfb, |
566 | unsigned long action, void *_arg) | |
567 | { | |
568 | pr_debug("%s: action: %ld\n", __func__, action); | |
569 | ||
570 | switch (action) { | |
571 | case BL_NOTIFY_PRE_ENABLE: | |
572 | case BL_NOTIFY_PRE_DISABLE: | |
573 | cpufreq_unregister_driver(&bL_cpufreq_driver); | |
574 | break; | |
575 | ||
576 | case BL_NOTIFY_POST_ENABLE: | |
577 | set_switching_enabled(true); | |
578 | cpufreq_register_driver(&bL_cpufreq_driver); | |
579 | break; | |
580 | ||
581 | case BL_NOTIFY_POST_DISABLE: | |
582 | set_switching_enabled(false); | |
583 | cpufreq_register_driver(&bL_cpufreq_driver); | |
584 | break; | |
585 | ||
586 | default: | |
587 | return NOTIFY_DONE; | |
588 | } | |
589 | ||
590 | return NOTIFY_OK; | |
591 | } | |
592 | ||
593 | static struct notifier_block bL_switcher_notifier = { | |
594 | .notifier_call = bL_cpufreq_switcher_notifier, | |
595 | }; | |
596 | ||
14730145 SH |
597 | static int __bLs_register_notifier(void) |
598 | { | |
599 | return bL_switcher_register_notifier(&bL_switcher_notifier); | |
600 | } | |
601 | ||
602 | static int __bLs_unregister_notifier(void) | |
603 | { | |
604 | return bL_switcher_unregister_notifier(&bL_switcher_notifier); | |
605 | } | |
606 | #else | |
607 | static int __bLs_register_notifier(void) { return 0; } | |
608 | static int __bLs_unregister_notifier(void) { return 0; } | |
609 | #endif | |
610 | ||
8a67f0ef VK |
611 | int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops) |
612 | { | |
e79a23c5 | 613 | int ret, i; |
8a67f0ef VK |
614 | |
615 | if (arm_bL_ops) { | |
616 | pr_debug("%s: Already registered: %s, exiting\n", __func__, | |
617 | arm_bL_ops->name); | |
618 | return -EBUSY; | |
619 | } | |
620 | ||
621 | if (!ops || !strlen(ops->name) || !ops->init_opp_table) { | |
622 | pr_err("%s: Invalid arm_bL_ops, exiting\n", __func__); | |
623 | return -ENODEV; | |
624 | } | |
625 | ||
626 | arm_bL_ops = ops; | |
627 | ||
14730145 | 628 | set_switching_enabled(bL_switcher_get_enabled()); |
45cac118 | 629 | |
e79a23c5 VK |
630 | for (i = 0; i < MAX_CLUSTERS; i++) |
631 | mutex_init(&cluster_lock[i]); | |
632 | ||
8a67f0ef VK |
633 | ret = cpufreq_register_driver(&bL_cpufreq_driver); |
634 | if (ret) { | |
635 | pr_info("%s: Failed registering platform driver: %s, err: %d\n", | |
636 | __func__, ops->name, ret); | |
637 | arm_bL_ops = NULL; | |
638 | } else { | |
14730145 | 639 | ret = __bLs_register_notifier(); |
45cac118 NP |
640 | if (ret) { |
641 | cpufreq_unregister_driver(&bL_cpufreq_driver); | |
642 | arm_bL_ops = NULL; | |
643 | } else { | |
644 | pr_info("%s: Registered platform driver: %s\n", | |
645 | __func__, ops->name); | |
646 | } | |
8a67f0ef VK |
647 | } |
648 | ||
45cac118 | 649 | bL_switcher_put_enabled(); |
8a67f0ef VK |
650 | return ret; |
651 | } | |
652 | EXPORT_SYMBOL_GPL(bL_cpufreq_register); | |
653 | ||
654 | void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops) | |
655 | { | |
656 | if (arm_bL_ops != ops) { | |
657 | pr_err("%s: Registered with: %s, can't unregister, exiting\n", | |
658 | __func__, arm_bL_ops->name); | |
659 | return; | |
660 | } | |
661 | ||
45cac118 | 662 | bL_switcher_get_enabled(); |
14730145 | 663 | __bLs_unregister_notifier(); |
8a67f0ef | 664 | cpufreq_unregister_driver(&bL_cpufreq_driver); |
45cac118 | 665 | bL_switcher_put_enabled(); |
8a67f0ef VK |
666 | pr_info("%s: Un-registered platform driver: %s\n", __func__, |
667 | arm_bL_ops->name); | |
668 | arm_bL_ops = NULL; | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(bL_cpufreq_unregister); | |
39c8bbaf UKK |
671 | |
672 | MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>"); | |
673 | MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver"); | |
674 | MODULE_LICENSE("GPL v2"); |