1
2
3
4
5
6
7
8
9
10
11
12#include <linux/kernel.h>
13#include <linux/err.h>
14#include <linux/clk.h>
15#include <linux/io.h>
16#include <linux/slab.h>
17#include <linux/regulator/consumer.h>
18#include <linux/cpufreq.h>
19#include <linux/suspend.h>
20
21#include <mach/cpufreq.h>
22
23#include <plat/cpu.h>
24
25static struct exynos_dvfs_info *exynos_info;
26
27static struct regulator *arm_regulator;
28static struct cpufreq_freqs freqs;
29
30static unsigned int locking_frequency;
31static bool frequency_locked;
32static DEFINE_MUTEX(cpufreq_lock);
33
34static int exynos_verify_speed(struct cpufreq_policy *policy)
35{
36 return cpufreq_frequency_table_verify(policy,
37 exynos_info->freq_table);
38}
39
40static unsigned int exynos_getspeed(unsigned int cpu)
41{
42 return clk_get_rate(exynos_info->cpu_clk) / 1000;
43}
44
45static int exynos_target(struct cpufreq_policy *policy,
46 unsigned int target_freq,
47 unsigned int relation)
48{
49 unsigned int index, old_index;
50 unsigned int arm_volt, safe_arm_volt = 0;
51 int ret = 0;
52 struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
53 unsigned int *volt_table = exynos_info->volt_table;
54 unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz;
55
56 mutex_lock(&cpufreq_lock);
57
58 freqs.old = policy->cur;
59
60 if (frequency_locked && target_freq != locking_frequency) {
61 ret = -EAGAIN;
62 goto out;
63 }
64
65
66
67
68
69
70 for (old_index = 0;
71 freq_table[old_index].frequency != CPUFREQ_TABLE_END;
72 old_index++)
73 if (freq_table[old_index].frequency == freqs.old)
74 break;
75
76 if (freq_table[old_index].frequency == CPUFREQ_TABLE_END) {
77 ret = -EINVAL;
78 goto out;
79 }
80
81 if (cpufreq_frequency_table_target(policy, freq_table,
82 target_freq, relation, &index)) {
83 ret = -EINVAL;
84 goto out;
85 }
86
87 freqs.new = freq_table[index].frequency;
88 freqs.cpu = policy->cpu;
89
90
91
92
93
94
95 if (exynos_info->need_apll_change != NULL) {
96 if (exynos_info->need_apll_change(old_index, index) &&
97 (freq_table[index].frequency < mpll_freq_khz) &&
98 (freq_table[old_index].frequency < mpll_freq_khz))
99 safe_arm_volt = volt_table[exynos_info->pll_safe_idx];
100 }
101 arm_volt = volt_table[index];
102
103 for_each_cpu(freqs.cpu, policy->cpus)
104 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
105
106
107 if ((freqs.new > freqs.old) && !safe_arm_volt) {
108
109 regulator_set_voltage(arm_regulator, arm_volt,
110 arm_volt);
111 }
112
113 if (safe_arm_volt)
114 regulator_set_voltage(arm_regulator, safe_arm_volt,
115 safe_arm_volt);
116 if (freqs.new != freqs.old)
117 exynos_info->set_freq(old_index, index);
118
119 for_each_cpu(freqs.cpu, policy->cpus)
120 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
121
122
123 if ((freqs.new < freqs.old) ||
124 ((freqs.new > freqs.old) && safe_arm_volt)) {
125
126 regulator_set_voltage(arm_regulator, arm_volt,
127 arm_volt);
128 }
129
130out:
131 mutex_unlock(&cpufreq_lock);
132
133 return ret;
134}
135
136#ifdef CONFIG_PM
137static int exynos_cpufreq_suspend(struct cpufreq_policy *policy)
138{
139 return 0;
140}
141
142static int exynos_cpufreq_resume(struct cpufreq_policy *policy)
143{
144 return 0;
145}
146#endif
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163static int exynos_cpufreq_pm_notifier(struct notifier_block *notifier,
164 unsigned long pm_event, void *v)
165{
166 struct cpufreq_policy *policy = cpufreq_cpu_get(0);
167 static unsigned int saved_frequency;
168 unsigned int temp;
169
170 mutex_lock(&cpufreq_lock);
171 switch (pm_event) {
172 case PM_SUSPEND_PREPARE:
173 if (frequency_locked)
174 goto out;
175
176 frequency_locked = true;
177
178 if (locking_frequency) {
179 saved_frequency = exynos_getspeed(0);
180
181 mutex_unlock(&cpufreq_lock);
182 exynos_target(policy, locking_frequency,
183 CPUFREQ_RELATION_H);
184 mutex_lock(&cpufreq_lock);
185 }
186 break;
187
188 case PM_POST_SUSPEND:
189 if (saved_frequency) {
190
191
192
193
194
195
196 temp = locking_frequency;
197 locking_frequency = saved_frequency;
198
199 mutex_unlock(&cpufreq_lock);
200 exynos_target(policy, locking_frequency,
201 CPUFREQ_RELATION_H);
202 mutex_lock(&cpufreq_lock);
203
204 locking_frequency = temp;
205 }
206 frequency_locked = false;
207 break;
208 }
209out:
210 mutex_unlock(&cpufreq_lock);
211
212 return NOTIFY_OK;
213}
214
215static struct notifier_block exynos_cpufreq_nb = {
216 .notifier_call = exynos_cpufreq_pm_notifier,
217};
218
219static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
220{
221 policy->cur = policy->min = policy->max = exynos_getspeed(policy->cpu);
222
223 cpufreq_frequency_table_get_attr(exynos_info->freq_table, policy->cpu);
224
225 locking_frequency = exynos_getspeed(0);
226
227
228 policy->cpuinfo.transition_latency = 100000;
229
230
231
232
233
234
235
236 if (num_online_cpus() == 1) {
237 cpumask_copy(policy->related_cpus, cpu_possible_mask);
238 cpumask_copy(policy->cpus, cpu_online_mask);
239 } else {
240 policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
241 cpumask_setall(policy->cpus);
242 }
243
244 return cpufreq_frequency_table_cpuinfo(policy, exynos_info->freq_table);
245}
246
247static struct cpufreq_driver exynos_driver = {
248 .flags = CPUFREQ_STICKY,
249 .verify = exynos_verify_speed,
250 .target = exynos_target,
251 .get = exynos_getspeed,
252 .init = exynos_cpufreq_cpu_init,
253 .name = "exynos_cpufreq",
254#ifdef CONFIG_PM
255 .suspend = exynos_cpufreq_suspend,
256 .resume = exynos_cpufreq_resume,
257#endif
258};
259
260static int __init exynos_cpufreq_init(void)
261{
262 int ret = -EINVAL;
263
264 exynos_info = kzalloc(sizeof(struct exynos_dvfs_info), GFP_KERNEL);
265 if (!exynos_info)
266 return -ENOMEM;
267
268 if (soc_is_exynos4210())
269 ret = exynos4210_cpufreq_init(exynos_info);
270 else if (soc_is_exynos4212() || soc_is_exynos4412())
271 ret = exynos4x12_cpufreq_init(exynos_info);
272 else if (soc_is_exynos5250())
273 ret = exynos5250_cpufreq_init(exynos_info);
274 else
275 pr_err("%s: CPU type not found\n", __func__);
276
277 if (ret)
278 goto err_vdd_arm;
279
280 if (exynos_info->set_freq == NULL) {
281 pr_err("%s: No set_freq function (ERR)\n", __func__);
282 goto err_vdd_arm;
283 }
284
285 arm_regulator = regulator_get(NULL, "vdd_arm");
286 if (IS_ERR(arm_regulator)) {
287 pr_err("%s: failed to get resource vdd_arm\n", __func__);
288 goto err_vdd_arm;
289 }
290
291 register_pm_notifier(&exynos_cpufreq_nb);
292
293 if (cpufreq_register_driver(&exynos_driver)) {
294 pr_err("%s: failed to register cpufreq driver\n", __func__);
295 goto err_cpufreq;
296 }
297
298 return 0;
299err_cpufreq:
300 unregister_pm_notifier(&exynos_cpufreq_nb);
301
302 if (!IS_ERR(arm_regulator))
303 regulator_put(arm_regulator);
304err_vdd_arm:
305 kfree(exynos_info);
306 pr_debug("%s: failed initialization\n", __func__);
307 return -EINVAL;
308}
309late_initcall(exynos_cpufreq_init);
310